CN1191321A - Variable power optical system - Google Patents

Abstract

An optical system with changeable magnification is provided a first lens group with positive power, a second lens group with negative power, a third lens group with the positive power and a fourth lens group with negative power orderly from one side of an object. When a wide-angle end state is changed into a telescopic end state, an interval between the first lens group and the second lens group is increased, the interval between the second lens group and the third lens group is reduced, and the interval between the third lens group and the fourth lens group is reduced; when aperture diaphragm is arranged as being adjacent to the second or third lens group, at the same time, the focus of the first lens group is set as f1, the focus of the second lens group is set as f2, and the focus of the third lens group is set as f3, a formula that f3/f1 is more than 0.15 and less than 0.3 is satisfied.

Description

Variable power optical system

(1) technical scope under the invention

The present invention relates to variable power optical system, particularly relate to the variable power optical system that can obtain high variable power.In addition, the present invention relates to carry out the moving variable power optical system of image drift, thereby particularly relate to by making a part of lens combination move the variable power optical system that can make image drift moving along direction with respect to the optical axis approximate vertical.In addition, the present invention relates to variable power optical system, particularly relate to the optical property variable power optical system that can closely focus with low uncertainty that takes place when closely focusing.

(2) existing technology

In recent years, (photographic optical system of using among the カ system コ-ダ) etc. generally can be used lens of variable focal length as ordinary camera, video camera.In these video cameras, particularly in the ordinary camera that uses silver film to photograph, the general employing by the 35mm film converted, is that field angle about 50mm is included in the lens of variable focal length in the variable range with focal length.And, mainly be to adopt to have the lens of variable focal length of zoom ratio greater than 3 so-called high zoom.

In addition, pay attention to photographic optical system is assembled in the Portability of the one-piece type video camera of lens in the video camera body in recent years, want cube little, in light weight, propose the various relevant schemes that are suitable for the lens of variable focal length of these requirements, particularly proposed various relevant schemes of carrying out so-called many group lenss of variable focal length of zoom with the movable lens set more than 3.

For example, as lens shutter video camera etc., photographic optical system being assembled in the one-piece type video camera of the intrinsic lens of video camera, in the light path of photographic optical system, there are not mechanism elements such as catoptron.Therefore, there is no need to prolong back focal length,, negative lens group is configured in the position of the most close image planes of lens combination so adopt the power configuration mode of the formula of looking in the distance be suitable for miniaturization.

Aperture diaphragm is configured in the side of negative lens group near object, when the lens position state when wide-angle side state (state that focal length is the shortest) changes to telescope end state (state that focal length is the longest), the interval of aperture diaphragm and negative lens group is narrowed down, and, 2. with negative lens group to object one side shifting.

Its result because 1., the axle outer light beam by negative lens group under the wide-angle side state away from a side of optical axis along with the lens position state from the wide-angle side state variation to the telescope end state and close to optical axis.In addition, because 2., the negative lens group that is configured in that is produced by negative lens group increases (when lens position during from the wide-angle side state variation to the telescope end state, lateral magnification increases) near the focal length magnification of the lens combination of object one side.Utilize above 2 points, can compensate the variation of following the lens position state well and the variation of the off-axis aberration that takes place, and can realize high zoom to a certain degree.

; under near the state wide-angle side,, then on face, adhered under the situation of dust near the image planes of negative lens group if back focal length is too short; the picture of dust will be noted with the picture of the body that is taken, so preferably make the back focal length under the wide-angle side state get suitable value.In addition, under the wide-angle side state, axle outer light beam by negative lens group has the trend of leaving optical axis, in order to make the diameter miniaturization of lens, strengthen negative lens group disperse function, promptly to strengthen negative power be effective, but the lateral magnification of negative lens group increases towards forward, according to this point, the lateral magnification of the negative lens group under the telescope end state increases towards forward, so consequently, in order to maintain the optical property of defined under the telescope end state, and require to have very high lens position precision.

In addition, in many group lenss of variable focal length, positive lens groups is configured in side of close object, under the wide-angle side state, make this positive lens groups near image planes, the lens diameter of positive lens groups is diminished get final product, on the other hand, under the telescope end state, with positive lens groups be configured in than the interval between the lens combination of the more close picture side of this positive lens groups and enlarge, utilize positive lens groups to make light beam carry out bigger convergence,, but have following problem so that the lens total length is shortened.That is, as the example of the many groups lens of variable focal length that is suitable for small-sized and high zoom, known have so-called positive and negative 3 groups of lenss of variable focal length and positive and negative 4 groups of lenss of variable focal length.

Positive and negative 3 groups of lenss of variable focal length are from object one side, constitute by first lens combination with positive light coke, the 3rd lens combination that has second lens combination of positive light coke and have a negative power successively, when lens position state during from the wide-angle side state variation to the telescope end state, the interval of first lens combination and second lens combination increases, the interval of second lens combination and the 3rd lens combination reduces, and whole lens combination is to object one side shifting.And second lens combination by the negative part group be configured in its positive part group and constitute as side.Under the situation of these positive and negative 3 groups of forms, to compare with the wide-angle side state, the lateral magnification of the 3rd lens combination under the telescope end state is very big.Therefore, with respect to the minute movement amount of lens combination along optical axis direction, move with 2 powers of lateral magnification with being directly proportional the image planes position, so, there is increase, easily the problem of the performance degradation that the deviation by the bearing accuracy of lens causes takes place along with zoom ratio.

In addition, positive and negative 4 groups of lenss of variable focal length are from object one side, constitute by first lens combination with positive light coke, second lens combination, the 4th lens combination that has the 3rd lens combination of positive light coke and have a negative power successively with negative power, when lens position state during from the wide-angle side state variation to the telescope end state, the interval of first lens combination and second lens combination increases, the interval of second lens combination and the 3rd lens combination reduces, the interval of the 3rd lens combination and the 4th lens combination reduces, and whole lens combination is to object one side shifting.

Positive and negative 3 groups of lenss of variable focal length are so for example published the spy and are opened in flat 2-73211 communique etc., and positive and negative in addition 4 groups of lenss of variable focal length are for example published the spy and opened flat 2-207210 communique, the spy opens in flat 6-265788 communique etc.Positive and negative 4 groups of lens of variable focal length one sides are because movable lens set is many, so be suitable for the hypermutation coking.

On the other hand, in general,, the high speed of action can be sought to focus on, thereby the time lag that when photography take place (beginning time till the shutter action) can be shortened from pushing release-push along with the development of auto-focus function.In order to seek to focus on the high speed of action, be necessary to make the drive amount (=lens weight * amount of movement) of lens little.

Drive integratedly under the situation that all modes of operation of lens combination closely focus adopting, elongated along with focal length, for to being positioned at the body focusing that is taken of predetermined distance, necessary lens drive amount increases.Therefore, if the zoom ratio height, then the focal length of telescope end state is elongated, and it is big, so just bad to drive quantitative change.

Therefore, in the variable power optical system that is made of a plurality of movable lens set, when closely focusing, a lens combination or adjacent a plurality of lens combination of a plurality of lens combination by will constituting optical system move along optical axis direction, reduce drive amount.

In general, under the situation about when closely focusing, a plurality of lens combination being driven along optical axis direction, because lens position control is difficult, so only a lens combination is driven as focus groups mostly, such type of focusing can be divided into following (1) to (3) three kinds of modes.

(1) prefocusing (FF) mode

(2) inner focusing (IF) mode

(3) back focuses on (RF) mode

The prefocusing mode is the mode that drives first lens combination that is configured in the most close object one side of optical system, the back type of focusing is the mode that drives the last lens combination that is configured in the most close picture side of optical system, and the inner focusing mode is the mode of the lens combination of drive arrangements between first lens combination and last lens combination.

If when the lens diameter of focus groups was big, driving mechanism also maximized, so the prefocusing mode is not suitable for focusing on the high speed of action.

In general, by such formation lens combination, promptly in the high zoom lens of variable focal length, aperture diaphragm is configured near the central authorities of lens combination, variation along with the lens position state, the height of the axle outer light beam of the lens combination by leaving aperture diaphragm also changes, and suppresses the variation of the various aberrations that accompany with the variation of lens position state with this.Therefore, the last lens combination away from aperture diaphragm exists lens diameter to become big trend.

Therefore,, be fit to adopt the inner focusing mode, proposed various schemes so far for the high speed of focus control.

, open in the flat 2-73211 communique etc. in disclosed positive and negative 3 groups of lenss of variable focal length, if zoom ratio surpasses 3.5 times and when becoming big, then the lateral magnification of the 3rd lens combination becomes big in positive side the spy.For stopping precision, the needed lens of the optical property that obtains to stipulate are directly proportional with 2 powers of lateral magnification, thus big if zoom ratio becomes, so just need very high lens position precision, there is the problem that is difficult to realize.

Open in flat 2-207210 communique etc. in disclosed positive and negative 4 groups of lenss of variable focal length the spy, the 3rd lens combination is a focus groups, compare with the wide-angle side state, not only demanding lens stop precision under the telescope end state, and the amount of movement under the telescope end state different with the wide-angle side state less changes, under the telescope end state, have to stop precision control focus groups, so existing problems with high lens.

Open in flat 6-265788 communique etc. in disclosed positive and negative 4 groups of lenss of variable focal length the spy, though realized about 5 times zoom ratio, but it is not a bit open about in-plant focus adjustment method, can not suppress the to be taken variation of the various aberrations that the body position taken place when closely focus state changes from the infinity focus state, the result can not obtain good imaging performance from the infinity focus state to focus state closely.

Simultaneously, in the past under the slow situation of shutter speed, because the vibration of the camera that the vibration (Block レ) of hand etc. cause causes image blur in exposure process, the situation that exists photography to fail.

Generally speaking, if known a part of lens combination (to call " mobile lens group " in the following text) in the lens combination that constitutes lens combination is moved along the direction perpendicular to optical axis, just so as on perpendicular to the direction of optical axis, moving.In the case, even the mobile lens group is called the moving possible optical system of image drift along the optical system that the direction perpendicular to optical axis moved, also can obtain good imaging performance.

In order to solve above-mentioned because the problem of the photography failure that the vibration of hand etc. cause, known have a kind of so-called anti-dither optical device, it is that the optical system that image drift is moving possible, the vibration (be applied under the situation of camera, be the vibration of camera) of detection optical system and the vibration detection system of output information and the drive system that the mobile lens group is moved combine.In the anti-dither optical device, detect the vibration of the optical system that causes by the vibration of hand etc. by the vibration detection system, by drive system the mobile lens group is moved, it is moving to carry out image drift, results from the vibration of the optical system that detected and the change of the image position that takes place so that offset.Like this, in the anti-dither optical device, utilize the image drift that deliberately takes place moving, can compensate and result from the change of the vibration of optical system and the image position that takes place promptly as bluring.

, in the little lightweight camera of volume, it is difficult keeping camera not tremble.Therefore, the vibration of camera takes place easily when pushing release-push, the result often occurrence record the fuzzy situation of picture.Particularly in the photographic lens that adopts long-focus in order to improve zoom ratio, even small vibration takes place camera, it is fuzzy that significant picture also can take place, and causes the photography failure easily.

In the case, be applied in the camera, also can compensate the vibration of the camera that causes by the vibration of hand etc. and the change of the image position that takes place by the anti-dither optical device that will assemble the moving possible optical system of image drift., in the anti-dither optical device because the moving possible optical system of image drift is forced to carry out undue restriction on aberration compensation, thus should suppress image drift generation when moving performance degradation, realize that high zoom ratios is difficult again.

The object of the present invention is to provide a kind of small-sized and be suitable for hypermutation coking, variable power optical system that the imaging performance deterioration is few.

In addition, another object of the present invention is to provide a kind of small-sized and be suitable for the moving possible variable power optical system of image drift of high variable power.

In addition, another object of the present invention is to provide a kind of small-sized and be suitable for the variable power optical system that closely to focus of high variable power.

In order to achieve the above object, the variable power optical system of first form of the present invention is a kind ofly to begin to dispose successively first lens combination, second lens combination with negative power with positive light coke, have the 3rd lens combination of positive light coke, the variable power optical system with the 4th lens combination of negative power from object one side

When lens position state during from the wide-angle side state variation to the telescope end state, following moving, the interval of above-mentioned first lens combination and above-mentioned second lens combination is increased, the interval of above-mentioned second lens combination and above-mentioned the 3rd lens combination reduces, the interval of above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination reduces, aperture diaphragm and above-mentioned second lens combination or above-mentioned the 3rd lens combination are adjacent to configuration, the focal length of establishing above-mentioned first lens combination simultaneously is f1, the focal length of above-mentioned second lens combination is f2, when the focal length of above-mentioned the 3rd lens combination is f3, satisfy following conditional (1) or (2).

0.15＜f3/f1＜0.3 (1)

0.9＜|f2|/f3＜1.15 (2)

In addition, in order to reach above-mentioned another purpose, the variable power optical system of second form of the present invention is from object one side, the 4th lens combination G4 that have the first lens combination G1 with positive light coke, the second lens combination G2 successively, has the 3rd lens combination G3 of positive light coke and have negative power with negative power

When lens position state during from the wide-angle side state variation to the telescope end state, at least above-mentioned first lens combination G1 and above-mentioned the 4th lens combination G4 be to object one side shifting, so that the interval of above-mentioned first lens combination G1 and the above-mentioned second lens combination G2 increases, the interval of the above-mentioned second lens combination G2 and above-mentioned the 3rd lens combination G3 reduces, the interval of above-mentioned the 3rd lens combination G3 and above-mentioned the 4th lens combination G4 reduces;

Above-mentioned the 3rd lens combination G3 has two parts lens combination at least, with this at least a part of lens combination in two parts lens combination be made as mobile lens group Gs, move along the direction that is approximately perpendicular to optical axis by making it, it is moving to carry out image drift;

Aperture diaphragm is located between above-mentioned second lens combination G2 and above-mentioned the 3rd lens combination G3,

The the most close of above-mentioned mobile lens group Gs is made as D as the face of a side and the distance along optical axis between the above-mentioned aperture diaphragm, when the focal length of above-mentioned mobile lens group Gs is fs, meets the following conditions

D/fs＜0.2 (8)

In addition, in order to reach above-mentioned another purpose, the variable power optical system of the 3rd form of the present invention is from object one side, at least configuration has the first lens combination G1 of positive light coke, the second lens combination G2 with negative power and the lens combination GA with positive light coke successively, the last lens combination GE of negative power is configured in a side of close picture

When lens position state during from the wide-angle side state variation to the telescope end state, make the interval variation between above-mentioned first lens combination G1 and the above-mentioned second lens combination G2, and to object one side shifting, so that carry out converging action forcibly by above-mentioned first lens combination G1 and above-mentioned second lens combination G2 generation, and above-mentioned last lens combination GE is to object one side shifting

The above-mentioned second lens combination G2 is from object one side, constitutes by negative part lens combination G2a with negative power and positive part lens combination G2b with positive light coke successively,

Said lens group GA has a plurality of part lens combination, will with the part lens combination of aperture diaphragm disposed adjacent in these a plurality of part lens combination as mobile lens group Gs, move along the direction that is approximately perpendicular to optical axis by making it, it is moving to carry out image drift,

The focal length of above-mentioned negative part lens combination G2a is made as f2a, the focal length of above-mentioned positive part lens combination G2b is made as f2b, will be made as fvt at the synthetic focal length of above-mentioned first lens combination G1 under the telescope end state and the above-mentioned second lens combination G2, will meets the following conditions when all focal lengths of the optical system under the telescope end state are made as ft

0.1＜|f2a|/f2b＜0.4 (11)

0.2＜|fvt|/ft＜0.4 (12)

In addition, in order to reach another above-mentioned purpose, the variable power optical system of the 4th form of the present invention is from object one side, the first lens combination G1, the second lens combination G2 of negative power, the 3rd lens combination G3 of positive light coke and the 4th lens combination G4 of negative power by positive light coke constitutes successively

The above-mentioned second lens combination G2 has part lens combination GA with negative power and adjacent and separate the part lens combination GB of configuration with the airspace as side with above-mentioned part lens combination GA at least,

When lens position state during from the wide-angle side state variation to the telescope end state, all the said lens group is to above-mentioned object one side shifting, and the airspace between above-mentioned first lens combination G1 and the above-mentioned second lens combination G2 increases, airspace between above-mentioned second lens combination G2 and above-mentioned the 3rd lens combination G3 reduces, interval between above-mentioned the 3rd lens combination G3 and above-mentioned the 4th lens combination G4 reduces

When closely focusing, the above-mentioned second lens combination G2 is to above-mentioned object one side shifting,

If the radius-of-curvature of the most close lens face as side of above-mentioned part lens combination GA be Ra, above-mentioned part lens combination GB the radius-of-curvature of the lens face of close object side is Rb the time, meet the following conditions

-0.1＜(Ra-Rb)/(Ra+Rb)＜0.3 (13)

In addition, in order to reach another above-mentioned purpose, the variable power optical system of the 5th form of the present invention is from object one side, the first lens combination G1, the second lens combination G2 of negative power, the 3rd lens combination G3 of positive light coke and the 4th lens combination G4 of negative power by positive light coke constitutes successively

When lens position state during from the wide-angle side state variation to the telescope end state, all the said lens group is to above-mentioned object one side shifting, the interval of above-mentioned first lens combination G1 and the above-mentioned second lens combination G2 increases, the interval of above-mentioned second lens combination G2 and above-mentioned the 3rd lens combination G3 reduces, the interval of above-mentioned the 3rd lens combination G3 and above-mentioned the 4th lens combination G4 reduces

When closely focusing, the above-mentioned second lens combination G2 moves,

If the lateral magnification of above-mentioned the 4th lens combination G4 when the wide-angle side state is β 4W, the lateral magnification of above-mentioned the 4th lens combination G4 when the telescope end state is that the focal length of β 4T, the whole lens combinations when above-mentioned wide-angle side state is that the focal length of fw, the whole lens combinations when above-mentioned telescope end state is the ratio ft/fw of ft, above-mentioned ft and fw when being Z, meets the following conditions

0.45＜(β4T/β4W)/Z＜0.75 (17)

Fig. 1 is the synoptic diagram of configuring condition of the focal power of expression variable power optical system of the present invention.

Fig. 2 is the lens profile figure of the structure of expression first embodiment.

Fig. 3 is each aberration diagram of the wide-angle side state under the infinity focus state of first embodiment.

Fig. 4 is each aberration diagram of the middle focal length state under the infinity focus state of first embodiment.

Fig. 5 is each aberration diagram of the telescope end state under the infinity focus state of first embodiment.

Fig. 6 is photography magnification under the wide-angle side state of first embodiment each aberration diagram during for-1/30 times.

Fig. 7 is photography magnification under the middle focal length state of first embodiment each aberration diagram during for-1/30 times.

Fig. 8 is photography magnification under the telescope end state of first embodiment each aberration diagram during for-1/30 times.

Fig. 9 is the lens profile figure of the structure of expression second embodiment.

Figure 10 is each aberration diagram of the wide-angle side state under the infinity focus state of second embodiment.

Figure 11 is each aberration diagram of the middle focal length state under the infinity focus state of second embodiment.

Figure 12 is each aberration diagram of the telescope end state under the infinity focus state of second embodiment.

Figure 13 is photography magnification under the wide-angle side state of second embodiment each aberration diagram during for-1/30 times.

Figure 14 is photography magnification under the middle focal length state of second embodiment each aberration diagram during for-1/30 times.

Figure 15 is photography magnification under the telescope end state of second embodiment each aberration diagram during for-1/30 times.

Figure 16 is the lens profile figure of the structure of expression the 3rd embodiment.

Figure 17 is each aberration diagram of the wide-angle side state under the infinity focus state of the 3rd embodiment.

Figure 18 is each aberration diagram of the middle focal length state under the infinity focus state of the 3rd embodiment.

Figure 19 is each aberration diagram of the telescope end state under the infinity focus state of the 3rd embodiment.

Figure 20 is photography magnification under the wide-angle side state of the 3rd embodiment each aberration diagram during for-1/30 times.

Figure 21 is photography magnification under the middle focal length state of the 3rd embodiment each aberration diagram during for-1/30 times.

Figure 22 is photography magnification under the telescope end state of the 3rd embodiment each aberration diagram during for-1/30 times.

Figure 23 is the lens profile figure of the structure of expression the 4th embodiment.

Figure 24 is each aberration diagram of the wide-angle side state under the infinity focus state of the 4th embodiment.

Figure 25 is each aberration diagram of the middle focal length state under the infinity focus state of the 4th embodiment.

Figure 26 is each aberration diagram of the telescope end state under the infinity focus state of the 4th embodiment.

Figure 27 is photography magnification under the wide-angle side state of the 4th embodiment each aberration diagram during for-1/30 times.

Figure 28 is photography magnification under the middle focal length state of the 4th embodiment each aberration diagram during for-1/30 times.

Figure 29 is photography magnification under the telescope end state of the 4th embodiment each aberration diagram during for-1/30 times.

Figure 30 is the structural drawing of the variable power optical system of the expression fifth embodiment of the present invention.

Each aberration diagram when Figure 31 is an infinity focus state under the wide-angle side state of the 5th embodiment.

Each aberration diagram when Figure 32 is an infinity focus state under the middle focal length state of the 5th embodiment.

Each aberration diagram when Figure 33 is an infinity focus state under the telescope end state of the 5th embodiment.

Figure 34 is photography magnification under the wide-angle side state of the 5th embodiment each aberration diagram during for-1/30 times.

Figure 35 is photography magnification under the middle focal length state of the 5th embodiment each aberration diagram during for-1/30 times.

Figure 36 is photography magnification under the telescope end state of the 5th embodiment each aberration diagram during for-1/30 times.

Figure 37 is the intelligent shape aberration diagram of the image drift under the infinity focus state of wide-angle side state of the 5th embodiment when moving.

Figure 38 is the intelligent shape aberration diagram of the image drift under the infinity focus state of middle focal length state of the 5th embodiment when moving.

Figure 39 is the intelligent shape aberration diagram of the image drift under the infinity focus state of telescope end state of the 5th embodiment when moving.

Figure 40 is that the photography magnification under the wide-angle side state of the 5th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 41 is that the photography magnification under the middle focal length state of the 5th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 42 is that the photography magnification under the telescope end state of the 5th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 43 is the structural drawing of the variable power optical system of the expression sixth embodiment of the present invention.

Each aberration diagram when Figure 44 is an infinity focus state under the wide-angle side state of the 6th embodiment.

Each aberration diagram when Figure 45 is an infinity focus state under the middle focal length state of the 6th embodiment.

Each aberration diagram when Figure 46 is an infinity focus state under the telescope end state of the 6th embodiment.

Figure 47 is photography magnification under the wide-angle side state of the 6th embodiment each aberration diagram during for-1/30 times.

Figure 48 is photography magnification under the middle focal length state of the 6th embodiment each aberration diagram during for-1/30 times.

Figure 49 is photography magnification under the telescope end state of the 6th embodiment each aberration diagram during for-1/30 times.

Figure 50 is the intelligent shape aberration diagram of the image drift under the infinity focus state of wide-angle side state of the 6th embodiment when moving.

Figure 51 is the intelligent shape aberration diagram of the image drift under the infinity focus state of middle focal length state of the 6th embodiment when moving.

Figure 52 is the intelligent shape aberration diagram of the image drift under the infinity focus state of telescope end state of the 6th embodiment when moving.

Figure 53 is that the photography magnification under the wide-angle side state of the 6th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 54 is that the photography magnification under the middle focal length state of the 6th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 55 is that the photography magnification under the telescope end state of the 6th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 56 is the structural drawing of the variable power optical system of the expression seventh embodiment of the present invention.

Each aberration diagram when Figure 57 is an infinity focus state under the wide-angle side state of the 7th embodiment.

Each aberration diagram when Figure 58 is an infinity focus state under the middle focal length state of the 7th embodiment.

Each aberration diagram when Figure 59 is an infinity focus state under the telescope end state of the 7th embodiment.

Figure 60 is photography magnification under the wide-angle side state of the 7th embodiment each aberration diagram during for-1/30 times.

Figure 61 is photography magnification under the middle focal length state of the 7th embodiment each aberration diagram during for-1/30 times.

Figure 62 is photography magnification under the telescope end state of the 7th embodiment each aberration diagram during for-1/30 times.

Figure 63 is the intelligent shape aberration diagram of the image drift under the infinity focus state of wide-angle side state of the 7th embodiment when moving.

Figure 64 is the intelligent shape aberration diagram of the image drift under the infinity focus state of middle focal length state of the 7th embodiment when moving.

Figure 65 is the intelligent shape aberration diagram of the image drift under the infinity focus state of telescope end state of the 7th embodiment when moving.

Figure 66 is that the photography magnification under the wide-angle side state of the 7th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 67 is that the photography magnification under the middle focal length state of the 7th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 68 is that the photography magnification under the telescope end state of the 7th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 69 is the structural drawing of the variable power optical system of the expression eighth embodiment of the present invention.

Each aberration diagram when Figure 70 is an infinity focus state under the wide-angle side state of the 8th embodiment.

Each aberration diagram when Figure 71 is an infinity focus state under the middle focal length state of the 8th embodiment.

Each aberration diagram when Figure 72 is an infinity focus state under the telescope end state of the 8th embodiment.

Figure 73 is photography magnification under the wide-angle side state of the 8th embodiment each aberration diagram during for-1/30 times.

Figure 74 is photography magnification under the middle focal length state of the 8th embodiment each aberration diagram during for-1/30 times.

Figure 75 is photography magnification under the telescope end state of the 8th embodiment each aberration diagram during for-1/30 times.

Figure 76 is the intelligent shape aberration diagram of the image drift under the infinity focus state of wide-angle side state of the 8th embodiment when moving.

Figure 77 is the intelligent shape aberration diagram of the image drift under the infinity focus state of middle focal length state of the 8th embodiment when moving.

Figure 78 is the intelligent shape aberration diagram of the image drift under the infinity focus state of telescope end state of the 8th embodiment when moving.

Figure 79 is that the photography magnification under the wide-angle side state of the 8th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 80 is that the photography magnification under the middle focal length state of the 8th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 81 is that the photography magnification under the telescope end state of the 8th embodiment is the intelligent shape aberration diagram of-1/30 times of time image when moving.

Figure 82 is the lens arrangement figure of the variable power optical system of the expression ninth embodiment of the present invention.

Each aberration diagram when Figure 83 is the infinity focus state of wide-angle side of the 9th embodiment.

Each aberration diagram when Figure 84 is an infinity focus state under the middle focal length state of the 9th embodiment.

Each aberration diagram when Figure 85 is an infinity focus state under the telescope end state of the 9th embodiment.

Figure 86 is photography magnification each aberration diagram for-1/30 times time of the wide-angle side of the 9th embodiment.

Figure 87 is photography magnification under the middle focal length state of the 9th embodiment each aberration diagram during for-1/30 times.

Figure 88 is photography magnification each aberration diagram for-1/30 times time of the telescope end of the 9th embodiment.

Figure 89 is the lens arrangement figure of the variable power optical system of the expression tenth embodiment of the present invention.

Each aberration diagram when Figure 90 is the infinity focus state of wide-angle side of the tenth embodiment.

Each aberration diagram when Figure 91 is an infinity focus state under the middle focal length state of the tenth embodiment.

Each aberration diagram when Figure 92 is an infinity focus state under the telescope end state of the tenth embodiment.

Figure 93 is photography magnification each aberration diagram for-1/30 times time of the wide-angle side of the tenth embodiment.

Figure 94 is photography magnification under the middle focal length state of the tenth embodiment each aberration diagram during for-1/30 times.

Figure 95 is photography magnification each aberration diagram for-1/30 times time of the telescope end of the tenth embodiment.

Figure 96 is the lens arrangement figure of the variable power optical system of the expression 11st embodiment of the present invention.

Each aberration diagram when Figure 97 is the infinity focus state of wide-angle side of the 11 embodiment.

Each aberration diagram when Figure 98 is an infinity focus state under the middle focal length state of the 11 embodiment.

Each aberration diagram when Figure 99 is an infinity focus state under the telescope end state of the 11 embodiment.

Figure 100 is photography magnification each aberration diagram for-1/30 times time of the wide-angle side of the 11 embodiment.

Figure 101 is photography magnification under the middle focal length state of the 11 embodiment each aberration diagram during for-1/30 times.

Figure 102 is photography magnification each aberration diagram for-1/30 times time of the telescope end of the 11 embodiment.

Figure 103 is the lens arrangement figure of the variable power optical system of the expression 12nd embodiment of the present invention.

Each aberration diagram when Figure 104 is the infinity focus state of wide-angle side of the 12 embodiment.

Each aberration diagram when Figure 105 is an infinity focus state under the middle focal length state of the 12 embodiment.

Each aberration diagram when Figure 106 is an infinity focus state under the telescope end state of the 12 embodiment.

Figure 107 is photography magnification each aberration diagram for-1/30 times time of the wide-angle side of the 12 embodiment.

Figure 108 is photography magnification under the middle focal length state of the 12 embodiment each aberration diagram during for-1/30 times.

Figure 109 is photography magnification each aberration diagram for-1/30 times time of the telescope end of the 12 embodiment.

Figure 110 is the lens arrangement figure of the variable power optical system of the expression 13rd embodiment of the present invention.

Each aberration diagram when Figure 111 is the infinity focus state of wide-angle side of the 13 embodiment.

Each aberration diagram when Figure 112 is an infinity focus state under the middle focal length state of the 13 embodiment.

Each aberration diagram when Figure 113 is an infinity focus state under the telescope end state of the 13 embodiment.

Figure 114 is photography magnification each aberration diagram for-1/30 times time of the wide-angle side of the 13 embodiment.

Figure 115 is photography magnification under the middle focal length state of the 13 embodiment each aberration diagram during for-1/30 times.

Figure 116 is photography magnification each aberration diagram for-1/30 times time of the telescope end of the 13 embodiment.

Below, with reference to the description of drawings embodiments of the invention.

With reference to Fig. 1 embodiments of the invention are described.Fig. 1 is the synoptic diagram of configuring condition of the focal power of expression variable power optical system of the present invention.As shown in the drawing, variable power optical system of the present invention is 4 groups of types, from object one side, the first lens combination G1, the second lens combination G2 of negative power, the 3rd lens combination G3 of positive light coke and the 4th lens combination G4 of negative power by positive light coke constitutes successively.

Under situation as the variable power optical system of 4 groups of types, compare with the variable power optical system of 3 groups of types, owing to increased movable lens set, so along with the variation of the lens position state of the 4th lens combination and the variation of the lateral magnification that changes relaxed, can suppress the performance degradation that the discrete discrepancy by the lens position precision causes.

In the variable power optical system of these 4 groups of types, when lens position state during from the wide-angle side state variation to the telescope end state, at least make the first lens combination G1 and the 4th lens combination G4 to object one side shifting, so that the interval of the first lens combination G1 and the second lens combination G2 increases, the interval of the interval of the second lens combination G2 and the 3rd lens combination G3 and the 3rd lens combination G3 and the 4th lens combination G4 reduces, and can reach high zoom.At this moment, have the function that satisfies following condition 1～condition 4, can reach high performance and lightweight by making each lens combination.

Condition 1: suitably set the lateral magnification of the 4th lens combination under the telescope end state.

Condition 2: make the principal point of second lens combination be positioned at suitable position.

Near condition 3: aperture diaphragm is configured in the 3rd lens combination.

Condition 4: the aberration compensation definite functions that makes second lens combination and the 3rd lens combination.

In an embodiment of the present invention, the same with the variable power optical system of prior art, when lens position state during from the wide-angle side state variation to the telescope end state, the 4th lens combination G4 with negative power is to object one side shifting.As mentioned above, remarkable with respect to the ratio of the performance degradation of lens position skew under the situation that the lateral magnification of the 4th lens combination G4 that will be the telescope end state increases, be difficult to the optical property that obtains to stipulate.Otherwise, dwindle if will be the lateral magnification of the 4th lens combination G4 of telescope end state, then follow the variation of lens position state, the variation of the lateral magnification of the second lens combination G2 has to increase.If handle like this, the variation of the off-axis aberration that takes place in the second lens combination G2 also increases, so also be difficult to the optical property that obtains to stipulate like this.Therefore, according to condition 1, be suitable value by the lateral magnification that makes the 4th lens combination G4 that is the telescope end state, just may suppress the rapid deterioration of performance that the offset by the 4th lens combination G4 causes and variation of off-axis aberration etc.

Existing declaration condition 2, in the variable power optical system of prior art, under the wide-angle side state, the configuration of focal power is asymmetric, and the 4th lens combination G4 of negative power is near the configuration of image planes side, so positive bigger distortion aberration takes place easily.Different therewith, in the present invention, make the second lens combination G2 that is configured in the first lens combination G1 have strong negative focal power as side, make the collocation approximation of focal power be symmetric form, compensate positive distortion aberration thus.Particularly in the present invention, according to condition 2, by constituting the second lens combination G2 with negative part group and the positive part group that is configured in this negative part group as side, the principal point of the second lens combination G2 when making light beam from object side incident is positioned at than more close object one side of first lens combination, thus, the distortion aberration that can bear effectively is with the positive distortion aberration of compensation by the 4th lens combination G4 generation.

Existing declaration condition 3 is knownly propagated by being positioned at away from the BEAM SQUINT optical axis of the lens of the position of aperture diaphragm usually.Therefore, in order to make the lens diameter miniaturization of each lens combination that constitutes optical system, it is effective aperture diaphragm being configured near the total length center of optical system.Therefore, under the wide-angle side state, the form synthetic with the first lens combination G1 and the second lens combination G2 forms the negative part group, is made of as all negative positive and negative symmetric form power configuration of lens combination this negative part group and the 4th lens combination G4 that constitutes the 3rd lens combination G3 of positive part group and constitute the negative part group.At this moment,,, the variation of the intelligent image difference that accompanies with the variation that becomes big field angle easily can be suppressed particularly near wide-angle side, the miniaturization of lens diameter can also be reached simultaneously by aperture diaphragm being configured on the 3rd lens combination G3 according to condition 3.

Existing declaration condition 4 is because the second lens combination G2 has negative power, so an outer light beam is arranged by near the trend the optical axis.Particularly to the telescope end state, the axle outer light beam by second lens combination only changes incident angle to the axle outer light beam by the second lens combination G2, and is and highly almost constant from the wide-angle side state.Like this, under near the situation the axle outer light beam passes through optical axis, can not compensate off-axis aberration and axial aberration independently.Its on the other hand, in having the lens of variable focal length of high zoom ratios, the variation of the lateral magnification that accompanies with convergent-divergent is big, the variation of the incident angle of axle outer light beam is also big.Therefore, the variation of each aberration takes place easily.So just be necessary to compensate well axial aberration and the off-axis aberration that in the second lens combination G2, takes place.On the other hand, in case in order to make the light beam convergence of dispersing, the 3rd lens combination G3 has the strong positive light coke than the second lens combination G2, need compensate the negative spherical aberration that takes place in the 3rd lens combination G3 well.Therefore, state shown in condition 4, make the aberration compensation definite functions of the second lens combination G2 and the 3rd lens combination G3, it is important constituting suitable lens.

Then,, provide conditional (1)～(7) that are applicable to embodiments of the invention, these conditional is described according to the condition of above explanation.

At first, in first form of the present invention, preferably satisfy the following conditional (1) or the structure of (2).

0.15＜f3/f4＜0.3 ……(1)

0.9＜|f2|/f3＜1.15 ……(2)

In the formula, f1: the focal length of first lens combination

F2: the focal length of second lens combination

F3: the focal length of the 3rd lens combination

Conditional (1) is the conditional of ratio of the focal distance f 3 of the regulation focal distance f 1 of the first lens combination G1 and the 3rd lens combination G3.When the higher limit 0.3 of greater than condition formula (1), under the wide-angle side state, not only can not guarantee back focal length, and because the asymmetry of the power configuration between before and after the aperture diaphragm is stronger, so be difficult to compensate well positive distortion aberration.Otherwise when the lower limit 0.15 of less-than condition formula (1), the lens total length under the telescope end state will maximize, so do not meet general idea of the present invention.

Conditional (2) is the conditional of ratio of the focal distance f 3 of the regulation focal distance f 2 of the second lens combination G2 and the 3rd lens combination G3.In the present invention, because aperture diaphragm is configured near the 3rd lens combination G3, so the axle outer light beam by the second lens combination G2 has by near the trend the optical axis, therefore when lens position state during from the wide-angle side state variation to the telescope end state, by the second lens combination G2 the axle outer light beam height constant, only change incident angle.In addition, under the wide-angle side state,, be necessary to increase the focal power of the second lens combination G2, at this moment be necessary to compensate well the axial aberration that the second lens combination G2 takes place separately in order to obtain enough back focal length.

Specifically, if the focal power of the second lens combination G2 is increased along negative sense, then the compensation of the positive spherical aberration that takes place in second lens combination will be not enough.Otherwise, if reduce along negative sense, then will be away from optical axis by the axle outer light beam of the second lens combination G2, so the variation of the off-axis aberration that accompanies with the variation of lens position state increases.

Too, if the focal power of the 3rd lens combination G3 increases along forward, the compensation of the negative spherical aberration that then takes place in the 3rd lens combination G3 will be not enough for the 3rd lens combination G3.Otherwise, if reduce along forward, then will be away from optical axis by the axle outer light beam of the 3rd lens combination G3, so the variation of the off-axis aberration that accompanies with the variation of lens position state increases.

Therefore, the ratio of the focal length of best second lens combination G2 and the 3rd lens combination G3 is the value shown in the condition (2).If during the higher limit 1.15 of greater than condition (2), can consider in following two kinds of situations any one: 1. the focal power of the second lens combination G2 reduces along negative sense, and 2. the focal power of the 3rd lens combination G3 increases along forward.And, under situation 1., follow the variation of lens position state, the variation of off-axis aberration increases, and under situation 2., negative spherical aberration increases.

Otherwise when the lower limit 0.9 of less-than condition formula (2), can consider in following two kinds of situations any one: 3. the focal power of the second lens combination G2 increases along negative sense, and 4. the focal power of the second lens combination G2 reduces along forward.And under situation 3., positive spherical aberration increases, and under situation 4., follows the variation of lens position state, and the variation of off-axis aberration increases.

Following conditional (3) and (4) are described.In first form of the present invention, preferably satisfy following conditional (3) and (4).

0.03＜(D2W-D2T)/(fw·ft) ^1/2＜0.15 ……(3)

0.2＜(D1T-D1W)/f1＜0.4 ……(4)

In the formula, D1W: first lens combination G1 under the wide-angle side state and the interval of the second lens combination G2

D1T: first lens combination G1 under the telescope end state and the interval of the second lens combination G2

D2W: second lens combination G2 under the wide-angle side state and the interval of the 3rd lens combination G3

D2T: second lens combination G2 under the telescope end state and the interval of the 3rd lens combination G3

Fw: the focal length of variable power optical system under the wide-angle side state

Ft: the focal length of variable power optical system under the telescope end state

Conditional (3) is the conditional of variable quantity in the gap of the second lens combination G2 that changes along with the variation of lens position state of regulation and the 3rd lens combination G3, is in order to obtain the necessary conditional of optical property of regulation under the wide-angle side state.When the higher limit of greater than condition formula (3), the axle outer light beam by the second lens combination G2 under the wide-angle side state will be difficult to compensate well the variation of the intelligent image difference that is caused by field angle away from optical axis.Otherwise, when less than lower limit, can not obtain enough back focal length at the wide-angle side state, can not compensate the positive distortion aberration that in the 4th lens combination, takes place.

Conditional (4) is the conditional of variable quantity in the gap of the first lens combination G1 that changes along with the variation of lens position state of regulation and the second lens combination G2, is the conditional for the optical property of the shorteningization that obtains the lens total length under the telescope end state and regulation.When the higher limit of greater than condition formula (4), the axle outer light beam by the first lens combination G1 under the wide-angle side state will be away from optical axis, so can not seek the miniaturization of lens diameter.Otherwise when less than lower limit, the lens total length under the telescope end state will maximize, and this is undesirable.In addition, in the present invention, as mentioned above, the most handy negative part group and be configured in its positive part group and constitute the second lens combination G2 as side.

In addition, in the big variable power optical system of zoom ratio, the variation for each aberration of suppressing to change along with the variation of lens position state preferably compensates the aberration that takes place in each lens combination well, and particularly the compensation of spherical aberration is very important.For the focal power that makes the 3rd lens combination G3 increases along forward, make the light beam of being dispersed by the second lens combination G2 carry out strong convergence, be necessary to compensate well negative spherical aberration, the most handy compound lens and the positive lens that has positive focal power at least constitutes.Particularly along with the increase of zoom ratio, the variation of off-axis aberration taking place along with the variation of lens position state easily, therefore preferably makes the lens face away from aperture diaphragm be the aspheric surface shape.

Then declaration condition formula (5) reaches (6).In first form of the present invention,, preferably satisfy following conditional (5) and (6) in order to seek two aspects of miniaturization and high-performance.

0.3＜|f4|/f1＜0.4 ……(5)

1＜(D1T-D1W)/(D3W-D3T)＜2 ……(6)

In the formula, f4: the focal length of the 4th lens combination G4

D3W: the 3rd lens combination G3 under the wide-angle side state and the interval of the 4th lens combination G4

D3T: the 3rd lens combination G3 under the telescope end state and the interval of the 4th lens combination G4

Conditional (5) is the conditional of the focal distance ratio of regulation first lens combination G1 and the 4th lens combination G4.When the higher limit of greater than condition formula (5), the axle outer light beam by the first lens combination G1 and the 4th lens combination G4 under the wide-angle side state will leave optical axis, so be difficult to compensate well the variation of the intelligent image difference that is caused by field angle.Otherwise when the lower limit of less-than condition formula (5), the lens total length will maximize.

Conditional (6) is regulation lens position state conditional at the ratio of the variable quantity of the variable quantity of first variable interval that forms the first lens combination G1 and the second lens combination G2 and the 3rd variable interval that forms between the 3rd lens combination G3 and the 4th lens combination G4 during from the wide-angle side state variation to the telescope end state.When the higher limit of greater than condition formula (6), when making the lens position state from the wide-angle side state variation to the telescope end state, big variation takes place in the magnification of the second lens combination G2, follows the variation of lens position state, is difficult to suppress the variation of the axial aberration that taken place by the second lens combination G2.Otherwise, when the lower limit of less-than condition formula (6), when making the lens position state from the wide-angle side state variation to the telescope end state, big variation takes place in the magnification of the 4th lens combination G4, follow the variation of lens position state, be difficult to suppress the variation of the off-axis aberration that takes place by the 4th lens combination G4.

Therefore, in constituting the lens of variable focal length group, generally be by a lens combination being moved along optical axis direction, focusing in the past.In addition, in order to seek to focus the high speed of action or the miniaturization and the simplification of focus adjusting mechanism, the lens combination of the lens combination that importantly small-sized as much as possible light weight and selecting can closely be focused with less amount of movement driving when focusing on.In general, from aperture diaphragm lens combination far away, the axle outer light beam passes through away from optical axis, and it is big that lens diameter becomes easily, so preferably will be configured near the lens combination focus groups the aperture diaphragm.In addition, the lens combination that focal power is little is owing to needing big amount of movement, so preferably that focal power is big lens combination is as focus groups.

Because above-mentioned reason, preferably will be configured in lens combination than the more close picture side of the first lens combination G1 in the present invention as focus groups, particularly preferably with near the second lens combination G2 the aperture diaphragm of configuration as focus groups.

Follow declaration condition (7).

0.35＜(f3+|f2|)/(fw·ft) ^1/2＜0.7 ……(7)

Above-mentioned conditional (7) is the conditional of the focal length of regulation second lens combination G2 and the 3rd lens combination G3, is the conditional that reaches the usefulness of high zoom ratios with few number of lenses.When the lower limit of less-than condition formula (7), the focal power of the second lens combination G2 and the 3rd lens combination G3 is big, so can not constitute the second lens combination G2 and the 3rd lens combination G3, the optical property that can not obtain to stipulate with few number of lenses.In addition, in the present invention, by aspheric surface is imported on aperture diaphragm lens face far away, can compensate the variation of the intelligent image difference that causes by field angle well, seek high performance, perhaps by aspheric surface being imported near the lens face the aperture diaphragm, can also seek the generation of compensating for spherical aberration well and reduce number of lenses.

Secondly, as mentioned above, if adopt second form of the present invention, then from object one side, the 4th lens combination G4 that have the first lens combination G1 with positive light coke, the second lens combination G2 successively, has the 3rd lens combination G3 of positive light coke and have negative power with negative power.When lens position state during from the wide-angle side state variation to the telescope end state, the at least the first lens combination G1 and the 4th lens combination G4 are to object one side shifting, so that the interval of the first lens combination G1 and the second lens combination G2 increases, the interval of the second lens combination G2 and the 3rd lens combination G3 reduces, and the interval of the 3rd lens combination G3 and the 4th lens combination G4 reduces.In addition, the 3rd lens combination G3 has two parts lens combination at least, with this at least a part of lens combination in two parts lens combination move along the direction that is approximately perpendicular to optical axis by making it as mobile lens group Gs, it is moving to carry out image drift.In addition, aperture diaphragm is located between the second lens combination G2 and the 3rd lens combination G3.In the present invention, by as above constituting variable power optical system, the deterioration of the various aberrations that take place in the time of suppressing well to make image drift moving can reach the hypermutation coking.

At first, the lens of variable focal length that adopts in the one-piece type camera of lens in the camera body of like that Photographical lens system being packed into such as similar front shutter camera is generally discussed.

In the optical system that in the one-piece type camera of these lens, adopts, owing to not limited by back focal length,, negative lens group can be configured in a side of the most close picture of optical system so can use the power configuration mode of the telescopic that is suitable for miniaturization.

In addition, aperture diaphragm is configured in than more close object one side of negative lens group.And, when the lens position state when wide-angle side state (state that focal length is the shortest) changes to telescope end state (state that focal length is the longest), [I] reduces the interval of aperture diaphragm and negative lens group, [II] makes negative lens group shift to object one side simultaneously.Because [I] reduces the interval of aperture diaphragm and negative lens group, so under the wide-angle side state, leave optical axis by the axle outer light beam of negative lens group, close optical axis under telescope end state state.In addition, because [II] makes negative lens group shift to object one side, so negative lens group increased magnification (with respect to the wide-angle side state, the size of the lateral magnification under the telescope end state increases).Utilize above [I] and [II] 2 points, can compensate the variation of following the lens position state well and the variation of the off-axis aberration that takes place can realize hypermutation coking to a certain degree.

But, if back focal length is too short under the wide-angle side state, then the shadow of the dust that on face, adheres near the image planes of negative lens group can with the body that is taken as overlapping and be recorded on the film.Therefore, be necessary to make the back focal length under the wide-angle side state to get suitable value, the result, the lateral magnification of negative lens group almost is certain under the wide-angle side state.

As mentioned above, a plurality of movable lens set are arranged more,, can shorten the lens total length under the wide-angle side state, so can seek the miniaturization of the lens diameter of positive lens groups because positive lens groups is configured in the most close object one side though organize lens of variable focal length.Otherwise, under the telescope end state, owing to make positive lens groups shift to object one side, increase so that make positive lens groups and be configured in its interval as the lens combination of side, so, can utilize positive lens groups to make the light beam convergence forcibly, the lens total length is shortened.

As the concrete form of the many groups lens of variable focal length that is fit to miniaturization and hypermutation coking, known (A) positive and negative 3 groups of types are for example arranged and (B) positive and negative 4 groups of types.

Under the situation of (A) positive and negative 3 groups of types, if the lateral magnification of the 3rd lens combination under the telescope end state is very big, zoom ratio increases, then the lateral magnification of the 3rd lens combination under the telescope end state can sharply become big.In addition, if the 3rd lens combination moves a small quantity along optical axis direction, then move with the relation of 2 powers of the lateral magnification of the 3rd lens combination the image planes position.Therefore, under the situation of (A) positive and negative 3 groups of types, if zoom ratio increases, then performance stops the decline of precision with lens and sharply descends, and this is ill-considered.

On the other hand, under the situation of (B) positive and negative 4 groups of types, more than the positive and negative 3 groups of types of the number of movable lens set (A), along with the variation of the lateral magnification of the 4th lens combination of lens position state variation relaxes, so compare with (A) positive and negative 3 groups of types, can suppress to stop the performance decline that precision causes by lens.

According to above investigation,,, also can realize the hypermutation coking by adopting positive and negative 4 groups of types even in second and third form of the present invention.

, as mentioned above,, cause the focal length of telescope end state elongated, then because the vibration of the camera that the vibration of hand etc. cause causes image blur easily if follow the hypermutation coking.Therefore, below explanation reaches in order to constitute the condition that the moving possible variable power optical system of the needed image drift of anti-dither optical system that can relax the fuzzy generation of picture is used.

At first, the desired aberration compensation function of mobile lens group is described.

Usually, require the mobile lens group when image drift is moving, also to be the aberration compensation state that can obtain good imaging performance.Specifically, require 1. that spherical aberration and sine condition can be compensated well, and 2. suitable Po Ziwaer and.

What is called 1. spherical aberration and sine condition can be compensated well, is meant make the mobile lens group be suppressed at the condition that eccentric intelligent image difference that the picture central part takes place is used when the direction with the optical axis approximate vertical moves.In addition, so-called 2. suitable Po Ziwaer and being meant is suppressed at the condition that curvature of the image that the picture peripheral part takes place is used when making image drift moving in mobile mobile lens group.

In second form of the present invention,, preferably constitute the mobile lens group with two lens at least in order to satisfy condition 1..Particularly by constituting mobile lens group, compensating axial aberration well with at least one positive lens and at least one negative lens.

, in general, in lens of variable focal length, for the optical property that obtains to stipulate, the variation of the axial aberration that takes place when needing 3. to compensate zoom well, the variation of the off-axis aberration that takes place when 4. compensating zoom well simultaneously.

Therefore, preferably lens combination is carried out aberration compensation, so that the condition that can satisfy 3. reaches condition 4. and reaches suitable aberration compensation state.Specifically, in order to satisfy condition 3., be necessary to compensate well the spherical aberration that each lens combination takes place separately.In addition, in order to satisfy condition 4., it is poor to be necessary to suppress the intelligent image that each lens combination takes place, and makes the Po Ziwaer of each lens combination and be suitable value.Particularly, preferably compensate the axial aberration that each lens combination takes place better, and reach the aberration compensation state that more suitably compensates off-axis aberration in order to improve zoom ratio.

In lens of variable focal length, constituting under the situation of mobile lens group by a lens combination, be suitable for satisfying the Po Ziwaer of condition 2. and and to be suitable for the Po Ziwaer of satisfied condition 4. not necessarily consistent with both.Therefore, constituting under the situation of mobile lens group, in optical design, be very restricted by a lens combination.

In the 3rd form of the present invention, in order to reach the hypermutation coking, can when image drift is moving, obtain good imaging performance again, constitute a lens combination with a plurality of part lens combination, constitute the mobile lens group with a part lens combination in these a plurality of part lens combination.Therefore, can suppress the variation of the off-axis aberration that accompanies with the variation of lens position state well, the variation of the curvature of the image in the time of suppressing well the mobile lens group is moved again.

Secondly, the position relation of mobile lens group and aperture diaphragm is described.

In optical system, pass through near the optical axis near the lens combination of axle outer light beam aperture diaphragm, different therewith, in aperture diaphragm lens combination far away, then passing through from position away from optical axis.Therefore, and compare from aperture diaphragm lens combination far away, near the lens diameter of the lens combination the aperture diaphragm little (in other words, efficient beam pass through scope, be that so-called effective aperture is little).

In addition, under the big situation of the lens diameter of mobile lens group, can cause along driving the maximization of the drive system of mobile lens group with the direction of optical axis approximate vertical.Its result, along with the maximization of camera body, the electric power of consumption also increases.

Therefore, the mobile lens group preferably is configured near the aperture diaphragm.

In addition, if with the mobile lens configuration set in position away from aperture diaphragm, then by the mobile lens group the axle outer light beam will be away from optical axis.Its result, when in mobile mobile lens group image drift being moved, it is poor at the picture peripheral part eccentric intelligent image to take place easily.Particularly under the situation of axle outer light beam with respect to the angle increase of optical axis that incides on the mobile lens group, it is poor at the picture peripheral part eccentric intelligent image to take place easily.Therefore, from the viewpoint of aberration compensation, preferably with the mobile lens configuration set near aperture diaphragm.

In addition, in the big high power variable optical system of zoom ratio, the variation of the off-axis aberration that takes place when compensating zoom well when being easy to act as most the lens position state from the wide-angle side state variation to the telescope end state, makes the height change by the axle outer light beam of each lens.

In second form of the present invention, aperture diaphragm is configured between the second lens combination G2 and the 3rd lens combination G3.At this moment, under the wide-angle side state by the 4th lens combination G4 the axle outer light beam along with the variation of field angle away from optical axis, under the telescope end state by the first lens combination G1 the axle outer light beam along with the variation of field angle away from optical axis.So both kept high optical property, and can realize high zoom ratios again.

In addition, in order to guarantee enough back focal length under the wide-angle side state, the second lens combination G2 has big negative power.Therefore, the chief ray that penetrates from the second lens combination G2 is little with respect to the angle that optical axis constitutes, and the height that incides the 3rd lens combination G3 is near optical axis.Its result, easy compensation at the picture peripheral part eccentric intelligent image takes place in the mobile lens group that makes a part that constitutes the 3rd lens combination G3 when the direction with the optical axis approximate vertical moves poor.

According to above investigation, in second form of the present invention, aperture diaphragm is configured between the second lens combination G2 and the 3rd lens combination G3, when the lens position state variation, make aperture diaphragm and the 3rd lens combination G3 be mobile integratedly, by a part of lens combination in a plurality of part lens combination that constitute the 3rd lens combination G3 is moved along the direction with the optical axis approximate vertical, can suppress the performance degradation that takes place when image drift is moved well simultaneously.

As mentioned above, utilize structure of the present invention, can realize suppressing well performance degradation that image drift takes place when moving, small-sized and variable power optical system that zoom ratio is high.

Below, each conditional of the present invention is described.

In second form of the present invention, satisfy following conditional (8)

D/fs＜0.2 (8)

In the formula, D: along the face of the most close picture side of mobile lens group Gs and the distance of the optical axis between the aperture diaphragm

Fs: the focal length of mobile lens group Gs

Conditional (8) is the conditional of the position relation of predetermined hole diameter diaphragm and mobile lens group Gs.

When the higher limit of greater than condition formula (8), since by mobile lens group Gs the axle outer light beam away from optical axis, so increase the contrast step-down of the image that is recorded when the direction with the optical axis approximate vertical moves in the eccentric intelligent image difference that mobile lens group Gs is taken place at the picture periphery.

In addition, in the present invention,, be necessary to guarantee to a certain extent the lens thickness of mobile lens group Gs in order to compensate each aberration that mobile lens group Gs takes place separately well.In addition, in order to ensure the optical property of regulation, preferably the lower limit with conditional (8) is set at 0.05, the deterioration of the optical property of generation when moving in order to suppress image drift better, and preferably the higher limit with conditional (8) is set at 0.15.

In addition, in second form of the present invention, in order to realize high zoom ratios, can suppress the performance degradation that image drift takes place when moving again well, the 3rd lens combination G3 is from object one side, be made of first positive part lens combination G31 with positive focal power and the second positive part lens combination G32 with positive focal power successively, the first near positive part lens combination G31 constitutes mobile lens group Gs from aperture diaphragm, preferably satisfies following conditional (9) simultaneously.

0.35＜f3/fs＜0.7 (9)

In the formula, f3: the focal length of the 3rd lens combination G3

The 3rd lens combination G3 be than the second lens combination G2 more can restrain that the light beam dispersed is used, have a lens combination of big positive light coke.In general, if the focal power of mobile lens group Gs is big, then in order to compensate the axial aberration that mobile lens group Gs takes place separately well, just needing increases the lens number, and the drive system of mobile lens group Gs will maximize as a result.

Therefore, in second form of the present invention, by constituting the 3rd lens combination G3 with two positive part lens combination at least, and with being configured in the positive part lens combination of close object side constitutes mobile lens group Gs, can realize all miniaturizations of camera.Particularly by setting the focal length of mobile lens group Gs, so that the formula that satisfies condition (9) then can seek to constitute the lens number of the 3rd lens combination G3 and the optimization of the lens number that constitutes mobile lens group Gs.

Here, the image drift momentum that takes place when the mobile lens group that is made of a part of lens combination in the optical system is moved along the direction vertical with optical axis is described.

If the lateral magnification of mobile lens group is β a, and will dispose to such an extent that be made as β b than mobile lens group is more close as all lateral magnifications of the lens combination of side, then corresponding with the amount of movement Δ of mobile lens group image drift momentum δ h can use following formula (a) expression.

δh＝(1-βa)βb·Δ (a)

In addition, (the 1-β a) coefficient k represented of β b| is called fuzzy coefficient with k=|.

When fuzzy coefficient k hour, make the mobile quantitative change of the moving necessary mobile lens group of ormal weight of image drift big, it is complicated that the driving mechanism of mobile lens group becomes.Otherwise when fuzzy coefficient k was big, if owing to departure makes the amount of movement variation of mobile lens group little, then image drift momentum change was big, the lack of contrast corresponding with high spatial frequency.

Therefore, preferably fuzzy coefficient k is set at suitable value.

Under the situation of variable power optical system, the lateral magnification of mobile lens group is β a and to be configured in that lateral magnification β b than the more close lens combination as side of mobile lens group is not limited to from the wide-angle side state to the telescope end state be certain value.As described herein, movably under the situation, fuzzy coefficient k follows the variation of lens position state and changes when being configured in the 4th lens combination G4 than the more close picture side of mobile lens group Gs at zoom.

, when the focal length of establishing optical system was f, the variable quantity δ a of the image position that takes place during optical system (and then camera) inclination ω was with following formula (b) expression.

δa＝f·tan?ω (b)

Therefore, move by making mobile lens group Gs, making the image drift momentum is δ h, so that satisfy following formula (c), then can compensate the picture variable quantity δ a that (inclination) causes that blurs by optical system.

δa+δh＝0 (c)

Compensation under the wide-angle side state by the inclination ω of optical system cause as the amount of movement Δ t of the amount of movement Δ w of the necessary mobile lens group of variable quantity δ aw and the necessary mobile lens group of picture variable quantity δ at that compensation is caused by the inclination ω of optical system under the telescope end state respectively by following formula (d) and (e) expression.

ΔW＝-δaw/kw (d)

Δt＝-δat/kt (e)

In the formula, kw is the fuzzy coefficient under the wide-angle side state, and kt is the fuzzy coefficient under the telescope end state.

Therefore, needed amount of movement Δ t under the telescope end state and under the wide-angle side state ratio of needed amount of movement Δ w, available following formula (f) expression.

Δt/Δw＝(δat/kt)/(δaw/kw)

＝(ft/fw)/(kt/kw) (f)

In the formula, ft is all focal lengths of the optical system under the telescope end state, and fw is all focal lengths of the optical system under the wide-angle side state.

Therefore, in second form of the present invention, the formula that preferably meets the following conditions (10).

0.4＜{(1-β3t)βst}/{(1-β3w)βSW}/Z＜0.9 (10)

In the formula, β 3w: the lateral magnification of mobile lens group Gs under the wide-angle side state

β sW: be configured in the lateral magnification of lens combination under the wide-angle side state than the more close picture side of mobile lens group Gs

β 3t: the lateral magnification of mobile lens group Gs under the telescope end state

β st: be configured in the lateral magnification of lens combination under the telescope end state than the more close picture side of mobile lens group Gs

Z: the zoom ratio of variable power optical system

Conditional (10) is the conditional of the opposite number of the above-mentioned formula of regulation (f).

The necessary optical property of image planes must be irrelevant with the focal length of photographic lens.For example, when the fuzzy angle of camera tilt regulation, the amount of movement of the fuzzy necessary mobile lens group of retrieved image can not both be guaranteed the optical property stipulated when wide-angle side state and telescope end state have a great difference, easily carry out the control of mobile lens group again.When the fuzzy angle of camera tilt regulation, have nothing to do with the lens position state and be under the situation of certain value at the amount of movement of the fuzzy necessary mobile lens group of retrieved image, an often timing of the value of formula (f) in other words, owing on aberration compensation, lost the degree of freedom of selecting the convergent-divergent track and the degree of freedom of selecting the lateral magnification of each lens combination, so be difficult to realize the hypermutation coking.

In second form of the present invention, be set in the scope of the formula of satisfying condition (10) by higher limit and lower limit above-mentioned (f), can realize the hypermutation coking, can carry out lens position control with less departure again.

In addition, in order more easily to carry out lens position control, the higher limit of preferably getting conditional (10) is 0.6, and lower limit is 0.5.

In addition, in the present invention, fuzzy detection system by will detecting camera (optical system), calculate according to the output that comes self-check system the mobile lens group amount of movement computing system and combine according to the drive system that the result of calculation of computing system drives the mobile lens group, make variable power optical system of the present invention have the function of anti-dither optical system.

In addition, if adopt the 3rd form of the present invention, then from object one side, at least configuration has the first lens combination G1 of positive light coke, the second lens combination G2 with negative power and a lens combination GA with positive light coke successively, is configured in from the picture side lens combination GE of negative power nearest.And, when lens position state during from the wide-angle side state variation to the telescope end state, in order to increase the converging action that the first lens combination G1 and the second lens combination G2 produce, change the interval of the first lens combination G1 and the second lens combination G2, and to object one side shifting, and make lens combination GE shift to object one side at last.The other second lens combination G2 is from object one side, is made of negative part lens combination G2a with negative power and positive part lens combination G2b with positive light coke successively.Moreover lens combination GA has the lens combination of a plurality of parts, with in the lens combination of these a plurality of parts with the part lens combination of aperture diaphragm disposed adjacent as mobile lens group Gs, move along the direction that is approximately perpendicular to optical axis by making it, it is moving to carry out image drift.

In the 3rd form of the present invention, the formula that meets the following conditions (11) and (12).

0.1＜|f2a|/f2b＜0.4 (11)

0.2＜|fvt|/ft＜0.4 (12)

In the formula, f2a: the focal length of negative part lens combination G2a

F2b: the focal length of positive part lens combination G2b

Fvt: first lens combination G1 under the telescope end state and the synthetic focal length of the second lens combination G2

Ft: the focal length that the optical system under the telescope end state is all

As mentioned above, if change greatly, then be difficult to carry out the control of mobile lens group from the wide-angle side state to telescope end state fuzzy coefficient k., the lateral magnification of fuzzy coefficient k and mobile lens group and be configured in more relevant than the lateral magnification of the lens combination of the more close picture side of mobile lens group.Therefore, along with the change that is configured in than the zoom effect of the lens combination of the more close picture side of mobile lens group is big, it is big that the variation of fuzzy coefficient k also becomes.

In the 3rd form of the present invention, make the zoom effect that is configured in than the lens combination of the more close object side of mobile lens group Gs big, by the variation of the fuzzy coefficient k that suppresses to accompany, under the state of lens position arbitrarily, can both easily carry out the control of mobile lens group Gs from the wide-angle side state to the telescope end state with the variation of lens position state.

In addition, in order to reach the hypermutation coking effectively with a spot of formation number of lenses, satisfy the optical property of regulation, and the deterioration that suppresses the optical property that image drift takes place when moving well, the same with second form in the 3rd form of the present invention, also be that aperture diaphragm is configured near the mobile lens group Gs, constitute lens combination GA with a plurality of part lens combination with mobile lens group Gs.

In addition, in order to shorten the total length of lens, the last lens combination GE of negative power is configured in the position of the most close picture side in the optical system, when lens position state during from the wide-angle side state variation to the telescope end state, make last lens combination GE to object one side shifting, magnification is increased.

Moreover, in the 3rd form of the present invention, in order under the wide-angle side state, to obtain enough back focal length, and under the telescope end state, seek the shorteningization of lens total length, the formula that imposes a condition (11).Conditional (11) has been stipulated suitable scope to the ratio of the focal length of the focal length of the negative part lens combination G2a among the second lens combination G2 and positive part lens combination G2b.

When the higher limit of greater than condition formula (11), the axle outer light beam of negative part lens combination G2a by the second lens combination G2 under the wide-angle side state is away from optical axis, it is poor in picture periphery branch big intelligent image to take place, so just can not obtain the optical property of regulation with a spot of number of lenses.

Otherwise when the lower limit of less-than condition formula (11), as mentioned above, the lens total length is maximization under the telescope end state.

But, be suitable value in order under the telescope end state, to seek the shorteningization of lens total length and to make fuzzy coefficient k, preferably make the synthetic focal length of the first lens combination G1 under the telescope end state and the second lens combination G2 formula (12) that satisfies condition.

If it is big that fuzzy coefficient k becomes, then the departure of the image position that is caused by the departure of the drive system that drives mobile lens group Gs becomes big, even the moving time image of image drift is not also thickened.Otherwise,, then make the drive amount of the moving necessary mobile lens group of the ormal weight Gs of image drift very big if fuzzy coefficient k is little.

As mentioned above, even in the 3rd form of the present invention, the position of aperture diaphragm and mobile lens group is closed and tied up to also is important on the aberration compensation.

In addition, in the present invention,, preferably aperture diaphragm is configured near the central authorities of optical system in order to improve zoom ratio, and the most handy movable lens set formation optical system more than 3.

Moreover, in the present invention, preferably with the second lens combination G2 as focus groups, it is moved along optical axis direction, carry out focusing to closer object.If constitute focus groups with the lens combination that is configured in than the more close picture side of mobile lens group Gs, even then identical lens position state, fuzzy coefficient k also can change along with the variation of the body position that is taken (object space).On the other hand, for example, shown in the second lens combination G2, if with constituting focus groups with the lens combination that is configured in than the more close object side of mobile lens group Gs, then fuzzy coefficient k has nothing to do with the body position that is taken and is certain value.

The moving possible variable power optical system of image drift of the present invention is not limited to lens shutter formula camera, for example can easily be applied to the spy and drive the lens of variable focal length of looking in the distance that disclosed simple lens reflective (a glance レ Off) camera is used in the clear 60-55314 communique.

In addition, in following each embodiment,,, then can compensate off-axis aberration such as curvature of the image and distortion aberration better, can reach wide-angleization and high performance if aspheric surface is imported near the lens that are configured in the aperture diaphragm though import aspheric surface.

In addition, in variable power optical system of the present invention, even, can have the function of common variable power optical system fully not carrying out also obtaining sufficiently high optical property under the moving user mode of image drift.

Secondly, as mentioned above, the variable power optical system that can closely focus of the 4th form of the present invention is from object one side, and the first lens combination G1, the second lens combination G2 of negative power, the 3rd lens combination G3 of positive light coke and the 4th lens combination G4 of negative power by positive light coke constitutes successively.

And, the above-mentioned second lens combination G2 has the part lens combination GA with negative power at least, and adjacent and separate the part lens combination GB of configuration with the airspace with above-mentioned part lens combination GA as side, when lens position state during from the wide-angle side state variation to the telescope end state, all the said lens group is to above-mentioned object one side shifting, and the airspace between above-mentioned first lens combination G1 and the above-mentioned second lens combination G2 increases, airspace between above-mentioned second lens combination G2 and above-mentioned the 3rd lens combination G3 reduces, interval between above-mentioned the 3rd lens combination G3 and above-mentioned the 4th lens combination G4 reduces, when closely focusing, the above-mentioned second lens combination G2 is to above-mentioned object one side shifting.

In this structure, if the radius-of-curvature of the most close lens face as side of part lens combination GA be Ra, above-mentioned part lens combination GB the radius-of-curvature of the lens face of close object side is Rb the time, the variable power optical system of the 4th form formula that preferably meets the following conditions

-0.1＜(Ra-Rb)/(Ra+Rb)＜0.3 (13)

Explanation now is suitable for having installed the lens of variable focal length of the one-piece type camera of lens of the Photographical lens system as lens shutter camera etc. in camera.

In the ordinary course of things, this lens of variable focal length is used to be suitable for the power configuration mode of the telescopic of camera body miniaturization, and negative lens group is configured in the most close image planes place of lens combination.

Aperture diaphragm is configured in than more close object one side of this negative lens group, when the lens position state when wide-angle side state (state that focal length is the shortest) changes to telescope end state (state that focal length is the longest), the interval of aperture diaphragm and negative lens group is narrowed down, and make negative lens group shift to object one side.Because the interval of aperture diaphragm and negative lens group is narrowed down, thus the axle outer light beam by negative lens group under the wide-angle side state away from optical axis, under the telescope end state near optical axis.In addition owing to make negative lens group shift to object one side, so negative lens group under the telescope end state, the size of lateral magnification increases promptly so-called the amplification with respect to the wide-angle side state.Utilize above 2 points, can compensate the variation of following the lens position state well and the variation of the off-axis aberration that takes place, and can realize hypermutation coking to a certain degree.

But if back focal length is too short under the wide-angle side state, then the shadow of the dust that adheres on the face near the image planes of negative lens group will be recorded on the film with the picture of the body that is taken, so be necessary to make the back focal length under the wide-angle side state to get suitable value.

As mentioned above, organize lens of variable focal length has a plurality of movable lens set more, makes to be configured in that first lens combination of close object side has positive light coke, and the lens total length is shortened, and dwindles the lens diameter of first lens combination.Moreover, when focal length variations arrives the telescope end state, first lens combination is moved to object one side, so that enlarge first lens combination and and as the interval between second lens combination with negative power of side disposed adjacent, utilize positive lens groups to make light beam carry out very strong convergence, seek lens total length shorteningization to a certain extent.

In addition, have negative power by making second lens combination, then the power configuration mode under the wide-angle side state is symmetric form approx, can compensate positive distortion aberration well, and can obtain enough back focal length.Particularly under the wide-angle side state, by enlarging the interval of second lens combination and the 3rd lens combination, the synthetic focal power of first lens combination and second lens combination is weakened to negative sense, the result can make the lens total length under the telescope end state further shorten.

The 4th form of the present invention is from object one side, successively by the first lens combination G1 of positive light coke, the second lens combination G2 of negative power, the 3rd lens combination G3 of positive light coke, and the 4th lens combination G4 of negative power constitutes variable power optical system, when lens position state during from the wide-angle side state variation to the telescope end state, the first lens combination G1 and the 4th lens combination G4 are moved to object side, so that the interval of the first lens combination G1 and the above-mentioned second lens combination G2 is increased, the interval of the second lens combination G2 and the 3rd lens combination G3 reduces, the interval of the 3rd lens combination G3 and the 4th lens combination G4 reduces, by with the second lens combination G2 as focus groups, can obtain good picture when closely focusing and determine performance, can realize small-sized again, the variable power optical system of high zoom ratios.

In addition, the 4th form of the present invention is according to such power configuration mode, with negative part group GA be configured in its positive part group GB and constitute the second lens combination G2 as side, negative part group and positive part group separate configuration with the airspace, in addition, make the shape of the airspace that between negative part group and positive part group, forms be suitable shape.Its result, the variation of the various aberrations that take place in the time of suppressing closely to focus, and can realize small-sized and hypermutation coking simultaneously.

Promptly, in the 4th form of the present invention, for make axle outer light beam by negative part group GA near optical axis, seek the miniaturization of lens diameter, and make by positive part group GB the axle outer light beam away from optical axis, compensate off-axis aberration well, seek high performance, so with negative part group GA be configured in its positive part group GB and constitute second lens combination as side.

If the interval of such positive part group GB and negative part group GA is narrow, then the focal power of negative part group GA and positive part group GB is big, the very large problem of performance degradation that the negative part group that takes place when existing with manufacturing and the mutual off-centre of positive part group accompany.Otherwise,, then can not seek the miniaturization of the lens total length under the telescope end state fully if wide at interval.

In addition, except constitute the second lens combination G2 with negative part group GA and positive part group GB, preferably also to satisfy above-mentioned conditional (13).

Can both obtain good imaging performance in order to spread all over the picture peripheral part from the picture core, conditional (13) has been stipulated the be clipped in the middle suitable scope from the radius of curvature R b of the nearest lens face of object side from the radius of curvature R a of the nearest lens face of picture side and positive part group GB of negative part group GA of configuration of airspace.The formula (13) owing to satisfy condition is so can compensate the variation of the various aberrations that take place when closely focusing well.

If the higher limit of greater than condition formula (13), the variation of the intelligent image difference that takes place when then closely focusing under the wide-angle side state will become big.Otherwise, if less than lower limit, then can not compensate the positive spherical aberration that takes place by second lens combination fully, particularly can not compensate the variation of the spherical aberration that takes place when closely focusing under the telescope end state well.

In addition, the variable power optical system of the 4th form of the present invention preferably meets the following conditions

0.03 in＜(Δ 2/f1)/(ft/fw)＜0.1 (14) formulas, Δ 2=D1T-D1W

D1W: first lens combination G1 under the wide-angle side state and the airspace of the second lens combination G2

D1T: first lens combination G1 under the telescope end state and the airspace of the second lens combination G2

F1: the focal length of the first lens combination G1

Fw: the focal length of the whole lens combination under the wide-angle side state

Ft: the focal length of the whole lens combination under the telescope end state

When the formula of satisfying condition (14), the lens total length is shortened more, and can seek high-performance.When the higher limit of greater than condition formula (14), then the off-axis ray by first lens combination can be away from optical axis, so will cause the maximization of first lens combination under the telescope end state.Otherwise, when the lower limit of less-than condition formula (14), because the converging action of first lens combination weakens, so can not seek the miniaturization of lens total length.

In addition, the variable power optical system of the 4th form of the present invention preferably meets the following conditions

0.25 in＜(β 2T/ β 2W)/Z＜0.5 (15) formula, β 2W: the lateral magnification of the second lens combination G2 under the wide-angle side state

β 2T: the lateral magnification of the second lens combination G2 under the telescope end state

The ratio ft/fw of Z:ft and fw

Above-mentioned conditional (15) is the conditional of the suitable amount of movement of focus groups second lens combination when stipulating closely to focus.

At first, the little method of amount of movement that makes in the 4th form of the present invention when closely focusing is described.

Open as described in the clear 58-202416 communique as the spy, when the lateral magnification of establishing the focal length that is configured in than the lens combination of the more close object side of focus groups and be fA, focus groups is β F, focuses on amount of movement and determine by following formula.

P＝fA ²·βF ²/(βF ²-1)

In the 4th form of the present invention, be configured in than focus groups promptly the lens combination of the more close object side of second lens combination be first lens combination, fA does not change with the lens position state, so it is relevant with the value k that is expressed from the next to focus on amount of movement.

K=β F ²/ (β F ²-1) therefore,, seeks to focus on the high speed of action, be necessary to make this k little for the amount of movement that makes focus groups is little.

Particularly at β F ²Under=1 the situation, the k value is infinitely great, can not focus on.As β F ²＞1 o'clock, preferably make k be approximately 1, just make 1/ β F ²Be approximately 0, otherwise, as β F ²＜1 o'clock, preferably make k be approximately 0, just make β F ²Be approximately 0.

In the 4th form of the present invention, set i.e. lateral magnification β 2 satisfied-1＜β 2＜0 of second lens combination of focus groups, particularly make the lateral magnification β 2T under the telescope end state be approximately 0, reduce to focus on amount of movement., owing to cause the maximization of lens total length, so preferably get more suitable value.

The focal length of first lens combination in the variable power optical system of the 4th form of the present invention is for just, and the synthetic focal length of first lens combination and second lens combination is for negative.In addition, when lens position state during from the wide-angle side state variation to the telescope end state, the airspace that forms between first lens combination and second lens combination slowly enlarges, so the lateral magnification β 2W of second lens combination under wide-angle side state and telescope end state and β 2T satisfy β 2T/ β 2W＞1.

Here, the value K that represents with K=β 2T/ β 2W represents the variable quantity of the lateral magnification of second lens combination that accompanies with the variation of lens position state.When K was bigger with respect to the variable focal length of full impregnated mirror system, with respect to the wide-angle side state, the amount of movement of second lens combination under the telescope end state during to closely the focusing of the same body that is taken became very big.Its result, under the telescope end state the mobile quantitative change of focus groups big, the electric power that drives the required consumption of second lens combination increases, and can not seek to focus on the high speed of action.

Otherwise when K was smaller with respect to variable focal length, the needed precision that stops of optical property that obtains regulation under the telescope end state became very high, is difficult to the optical property that obtains to stipulate.

Conditional (15) is the conditional of the proper range of regulation K and zoom ratio, as mentioned above, gets suitable value by making conditional (15), then can easily control second lens combination when closely focusing.

In addition, in the 4th form of the present invention, preferably make the lateral magnification β 2T of second lens combination under the telescope end state satisfy β 2T＞-1.Under the wide-angle side state,,, be necessary to make the synthetic focal length of first lens combination and second lens combination to be negative little value, at this moment become β 2W＞-1 so that compensate positive distortion aberration in order to ensure enough back focal length.Otherwise, if β is 2T＜-1, then can not focus on ,-1 situation is all bad to comprise that the lateral magnification of second lens combination becomes.

In addition, in the variable power optical system of the 4th form of the present invention, preferably aperture diaphragm is configured between the second lens combination G2 and the 3rd lens combination G3.At this moment, suppose that the second lens combination G2 is R4 from the radius-of-curvature of above-mentioned aperture diaphragm lens face LS farthest, and be located at the wide-angle side state lower edge distance of optical axis when being D, preferably meet the following conditions from aperture diaphragm to lens face LS.

1.5＜|R4|/D＜3.5 (16)

Conditional (16) particularly is used for the condition that regulation obtains higher optical property under the wide-angle side state.

Under the situation of the higher limit of greater than condition formula (16), under the wide-angle side state, can not guarantee enough back focal length, will go on record with the shadow of dust on the approaching lens face of film face.Otherwise under the situation less than lower limit, the variation of the off-axis aberration that takes place when closely focusing increases, and optical property is deterioration significantly, and this is undesirable.

Secondly, the position of the aperture diaphragm in the 4th form of the present invention is described.In general, in order to seek the miniaturization of camera, need make the lens barrel diameter little.The axle outer light beam is subjected to very big disperse function during by second lens combination, if but aperture diaphragm is configured in object one side of second lens combination, then the height of the chief ray by the 3rd lens combination will be terrifically away from optical axis, cause the lens diameter of the 3rd lens combination and the 4th lens combination to maximize, the diameter of lens barrel becomes big as a result.Otherwise, if aperture diaphragm is configured in the picture side of the 3rd lens combination, then not only the lens diameter of first lens combination maximizes, and it is poor in the negative part group that constitutes second lens combination very large intelligent image will to take place, and can not obtain good imaging performance at the picture peripheral part.

In the 4th form of the present invention,, preferably aperture diaphragm is configured near the central authorities of optical system in order to realize small-sized and the hypermutation coking.By such configuration, when lens position state during from the wide-angle side state variation to the telescope end state, by dispose from the chief ray of aperture diaphragm first lens combination far away and the 4th lens combination in first lens combination away from optical axis, in the 4th lens combination near optical axis, can compensate the variation of the off-axis aberration that accompanies with the variation of lens position state well, and can the hypermutation coking.

Particularly preferably aperture diaphragm is configured between second lens combination and the 3rd lens combination.By such formation, under the wide-angle side state, by second lens combination the axle outer light beam away from axial pencil, so can compensate off-axis aberration better.But if the axle outer light beam is too far away from optical axis, then lens diameter must become greatly, can not realize the miniaturization of focus groups.

Therefore, in the 4th form of the present invention, preferably aperture diaphragm is configured between second lens combination and the 3rd lens combination, and makes the lens diameter equalization, so that make by not leaving optical axis away from first lens combination of aperture diaphragm configuration and the axle outer light beam of the 4th lens combination.

In addition, when the lens position state variation, aperture diaphragm is integrally moved with second lens combination or the 3rd lens combination with the aperture diaphragm disposed adjacent, can simplify the structure of lens barrel.

In the present invention, as mentioned above, preferably aperture diaphragm is configured between second lens combination and the 3rd lens combination, and will drives as focus groups from the second little lens combination of the near lens diameter of aperture diaphragm.Therefore can simplify control focus groups control gear.

In addition, the variable power optical system of the 5th form of the present invention is from object one side, and the first lens combination G1, the second lens combination G2 of negative power, the 3rd lens combination G3 of positive light coke and the 4th lens combination G4 of negative power by positive light coke constitutes successively.

And, when lens position state during from the wide-angle side state variation to the telescope end state, all said lens groups move to object side, the interval of above-mentioned first lens combination G1 and the above-mentioned second lens combination G2 increases, the interval of above-mentioned second lens combination G2 and above-mentioned the 3rd lens combination G3 reduces, and the interval of above-mentioned the 3rd lens combination G3 and above-mentioned the 4th lens combination G4 reduces.Here, when closely focusing, the above-mentioned second lens combination G2 moves.

In the 5th form of the present invention, suppose above-mentioned the 4th lens combination G4 be β 4W, above-mentioned the 4th lens combination G4 at the lateral magnification under the telescope end state at the lateral magnification under the wide-angle side state be β 4T, be fw at the focal length of the above-mentioned whole lens combinations under the wide-angle side state, the focal length of the above-mentioned whole lens combinations under the telescope end state is the ratio ft/fw of ft and above-mentioned ft and fw when being Z, formula preferably meets the following conditions.

0.45＜(β4T/β4W)/Z＜0.75 (17)

The suitable ratio of the lateral magnification of conditional (17) regulation the 4th lens combination.Zoom ratio greater than 3.5 times situation under, when lens position state during from the wide-angle side state variation to the telescope end state, the lateral magnification of the 4th lens combination changes greatly, the precision of lens position is very high under the telescope end state.

Therefore, suitably set the variation of the lateral magnification that accompanies with the variation of the lens position state of second lens combination, and the formula that satisfies condition (17), by such formation lens, lens total length under the telescope end state is shortened, the variation of the lateral magnification of the 4th lens combination that accompanies with the variation of lens position state can be suppressed, the precision of the lens position under the telescope end state can be relaxed.

In the variable power optical system that can closely focus of the 5th form of the present invention, any one lens combination or its part from first lens combination to the, four lens combination are moved along the direction vertical with optical axis.Particularly under the situation that second lens combination or the 3rd lens combination or its part are moved along the direction with the optical axis approximate vertical, can seek the miniaturization of drive system.

In addition, constitute the 3rd lens combination with a plurality of part groups, by making than moving along the direction vertical with optical axis as the part group in the part group of the more close object side configuration of the part group of side, can suppress will be as the performance degradation that takes place when the wide-angle side state moves to the telescope end state with doing one's utmost.

Can make the moving possible variable power optical system of this image drift have following function, be about to detect because the detection system of the vibration of the camera that the vibration of hand etc. causes, move along direction with the optical axis approximate vertical regulation lens combination drive system and according to combine the by way of compensation fuzzy anti-dither optical device of the picture that vibration by camera causes of the computing system by the vibration information calculations drive amount of detection system output.

In addition, the moving possible variable power optical system of image drift of the present invention is not limited to lens shutter formula camera, for example can also be applied to the spy at an easy rate and drive the lens of variable focal length of looking in the distance that the single-lens camera described in the clear 60-55314 is used.

In addition, in following embodiment,,, then can seek heavy caliberization if aspheric surface is configured on the lens that dispose near aperture diaphragm though use aspheric surface.In addition,, then can compensate off-axis aberration such as curvature of the image and distortion aberration better, can realize wide-angleization and high performance if aspheric surface is configured on the lens that dispose away from aperture diaphragm.

Below, each numerical value embodiment of the present invention is described with reference to the accompanying drawings.

Fig. 1 is the configuring condition and the synoptic diagram of the situation of movement of each lens combination during from the wide-angle side state to telescope end state zoom of focal power of the variable power optical system of expression various embodiments of the present invention.

As shown in Figure 1, the variable power optical system of each numerical value embodiment of the present invention is from object one side, is made of the first lens combination G1 with positive light coke, the second lens combination G2 with negative power, the 4th lens combination G4 that has the 3rd lens combination G3 of positive light coke and have a negative power successively.And, when from the wide-angle side state when the telescope end state carries out zoom, whole lens combination are moved to object side, and the airspace of the first lens combination G1 and the second lens combination G2 is increased, the airspace of the second lens combination G2 and the 3rd lens combination G3 reduces, and the airspace of the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In each numerical value embodiment, suppose that height with the optical axis vertical direction is that the amount of movement (slippage) of the optical axis direction on y, the height y is that R, circular cone coefficient are κ, when n asphericity coefficient is Cn, can represent aspheric surface with following mathematical expression (g) for S (y), benchmark radius-of-curvature. $S\left(y\right)=\frac{\frac{y^2}{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="A9810375000901.png,A9810375000911.png"\; state="\{\{state\}\}">R</figure-callout>}}}{1+\sqrt{1-\mathrm{\&kappa;}\frac{y^2}{R^2}}}+C_4{\mathrm{<figure-callout\; id="4"\; label="y"\; filenames="A9810375000891.png,A9810375001571.png"\; state="\{\{state\}\}">y</figure-callout>}}^4+C_6{\mathrm{<figure-callout\; id="6"\; label="y"\; filenames="A9810375000961.png,A9810375001031.png"\; state="\{\{state\}\}">y</figure-callout>}}^6+C_8{\mathrm{<figure-callout\; id="8"\; label="y"\; filenames="A9810375001031.png,A9810375001561.png"\; state="\{\{state\}\}">y</figure-callout>}}^8+C_{10}{y}^{10}---\left(g\right)$ In each embodiment, on aspheric surface, be marked with on the right side of face numbering ^*Number.

(first embodiment)

Fig. 2 is the variable power optical system structural drawing of the first embodiment of the present invention, begins to be followed successively by from object one side: the first lens combination G1, and it is by convex surface is constituted towards the positive lens part of object side and the compound lens L1 of negative lens part; The second lens combination G2 is made of the compound lens L22 of biconcave lens L21, biconvex lens and biconcave lens; The 3rd lens combination G3 makes concave surface constitute towards the combination positive lens L31 and the biconvex lens L32 of the faying face of object side by having; The 4th lens combination G4 is by making convex surface towards as the positive lens L41 of side and concave surface is constituted towards the negative lens L42 of object side.Aperture diaphragm S1 is configured between the second lens combination G2 and the 3rd lens combination G3, and when lens position state during from the wide-angle side state variation to the telescope end state, aperture diaphragm S1 and the 3rd lens combination G3 integrally move.

The value of each unit of the variable power optical system of the first embodiment of the present invention has been shown in following table 1～table 4.F in each cell list of embodiment represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and refractive index is and the d line (value that λ=587.6nm) is corresponding.

[table 1] f 36.00～75.00～170.00FNO 3.78-6.29～11.00 ω 31.10～15.54～7.11 (°) face numbering radius-of-curvature face interval refractive index Abbe number

1 54.1928 4.250 1.48749 70.45

2 -52.3691 1.375 1.84666 23.83

3 -92.1386 (D3) 1.0

4 -25.5701 1.000 1.80420 46.51

5 26.6803 1.00 1.0

6 ^* 21.2449 3.500 1.71736 29.50

7 -13.5167 1.000 1.83500 42.97

8 72.4913 (D8) 1.0

9 0.0000 1.250 1.0

10 34.0724 3.125 1.48749 70.45

11 -13.2038 1.000 1.84666 23.83

12 -23.7313 1.125 1.0

13 53.3181 2.625 1.51450 63.05

14 ^* -25.4556 (D14) 1.0

15 ^* -248.6454 2.712 1.68893 31.16

16 -43.5428 7.353 1.0

17 -15.2053 1.250 1.77250 49.61

18 549.3023 (Bf) 1.0 the 6th, the tenth four sides, the 15 face are aspheric surfaces, and its shape is represented with following formula.

[the 6th face] 1/R=+1/21.2449 κ=1.1736 C4=+1.72430 * 10 ^-6

C6＝+1.91380×10 ^-7?C8＝-3.91910×10 ^-9 C10＝+4.47150×10 ^-11

[the 14th face] 1/R=-1/25.4556 κ=1.5838 C4=+3.34760 * 10 ^-5

C6＝+5.06200×10 ^-8?C8＝-2.72670×10 ^-10?C10＝+1.01290×10 ^-12

[the 15th face] 1/R=-1/248.6454 κ=-1.2808 C4=+1.49020 * 10 ^-5

C6＝-3.03490×10 ^-8?C8＝+2.80520×10 ^-10?C10＝+2.09070×10 ^-13

[table 2]

[variable interval table] f 35.9994 74.9983 170.0006D3 2.8161 15.7797 28.8035D8 4.2483 2.6490 1.2500D14 20.8296 10.9664 2.8750Bf 7.8751 31.1383 78.2651

[table 3] [overhang δ G2 of second lens combination during focusing] f 35.9994 74.9983 170.0006D0 1027.5967 2147.3279 4876.9022 δ G2 0.8752 0.7208 0.7057

Wherein, the overhang when overhang is meant photography magnification β=-1/30 times, and overhang with the direction of object one side for just.

[table 4] [conditional respective value]

(1)f3/f1＝0.225

(2)|f2|/f3＝1.026

(3)(D2W-D2T)/(fw.ft) ^1/2＝0.038

(4)(D1T-D1W)/f1＝0.292

(5)|f4|/f1＝0.328

(6)(D1T-D1W)/(D3W-D3T)＝1.447

(7)(f3+|f2|)/(fw.ft) ^1/2＝0.524

Fig. 3～Fig. 8 is each aberration diagram of variable power optical system of the first embodiment of the present invention, among these figure, Fig. 3～Fig. 5 represents each aberration diagram under the infinity focus state, each aberration diagram when Fig. 6～Fig. 8 represents focus state closely (photography magnification β=-1/30 times), in addition in these figure, Fig. 3 and Fig. 6 show each aberration under the wide-angle side state, and Fig. 4 and Fig. 7 show each aberration under the middle focal length state, and Fig. 5 and Fig. 8 show each aberration under the telescope end state.

In each aberration diagram of Fig. 3～shown in Figure 8, the solid line in the spherical aberration diagram is represented spherical aberration, and dotted line is represented sine condition, and the solid line among the astigmatism figure is represented radially image planes, and dotted line is represented the meridian image planes.Intelligent image when intelligent image difference figure represents image height y=0,5.4,10.8,15.1,21.6mm is poor, and A represents field angle, and H represents object height.Shown in these aberration diagrams, the variable power optical system of present embodiment can compensate each aberration well, has excellent imaging performance.

(second embodiment)

Fig. 9 is the variable power optical system structural drawing of the second embodiment of the present invention, begins to be followed successively by from object one side: the first lens combination G101, by convex surface is constituted towards the positive lens part of object side and the compound lens L101 of negative lens part; The second lens combination G102 is made of the compound lens L122 of biconcave lens L121, biconvex lens and biconcave lens; The 3rd lens combination G103 makes concave surface constitute towards the combination positive lens L131 and the biconvex lens 132 of the faying face of object side by having; The 4th lens combination G104 is by making convex surface towards as the positive lens L141 of side and concave surface is constituted towards the negative lens L142 of object side.Aperture diaphragm S101 is configured between the second lens combination G102 and the 3rd lens combination G103, and when lens position state during from the wide-angle side state variation to the telescope end state, aperture diaphragm S101 and the 3rd lens combination G103 integrally move.

The value of each unit of the second embodiment of the present invention has been shown in following table 5～table 8.The same with first embodiment, the f in each cell list represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and refractive index is and the d line (value that λ=587.6nm) is corresponding.

[table 5] f 38.93～75.60～183.96FNO 3.85～6.14～11.00 ω 28.78～15.43～6.58 (°) face numbering radius-of-curvature face interval refractive index Abbe number

1 51.8167 4.284 1.48749 70.45

2 -53.7693 1.386 1.84666 23.83

3 -97.0444 (D3) 1.0

4 -26.4310 1.008 1.77250 49.61

5 33.0387 0.756 1.0

6 ^* 22.2667 3.528 1.68893 31.16

7 -13.3299 1.008 1.80420 46.51

8 53.2684 (D8) 1.0

9 0.0000 1.260 1.0

10 33.7458 3.150 1.48749 70.45

11 -14.0844 1.008 1.84666 23.83

12 -25.9907 1.134 1.0

13 51.2297 2.646 1.51450 63.05

14 ^* -25.9086 (D14) 1.0

15 ^* 325.0348 3.098 1.68893 31.16

16 -60.6443 6.915 1.0

17 -14.3830 1.260 1.77250 49.61

18 3325.718 (Bf) 1.0 the 6th, the tenth four sides, the 15 face are aspheric surfaces, and its shape is represented with following formula.

[the 6th face] 1/R=+1/22.2667 κ=1.4465 C4=+1.32815 * 10 ^-6

C6＝+2.29845×10 ^-7 C8＝-4.26665×10 ^-9 C10＝+3.87369×10 ^-11

[the 14th face] 1/R=-1/25.9086 κ=1.3985 C4=+2.83877 * 10 ^-5

C6＝+2.11412×10 ^-7 C8＝-3.76902×10 ^-9 C10＝+2.80604×10 ^-11

[the 15th face] 1/R=+1/325.0348 κ=11.0000 C4=+1.95413 * 10 ^-5

C6＝+4.87122×10 ^-8 C8＝-3.67858×10 ^-10 C10＝+3.55599×10 ^-12

[table 6] [variable interval table]

f 38.9344 75.6011 183.9649

D3 3.0033 14.6630 29.5856

D8 4.0122 2.8704 1.2600

D14 21.7699 12.0689 2.8980

Bf 7.9388 29.1277 78.7294

[table 7] [overhang δ G2 of second lens combination during focusing]

f 38.9344 75.6011 183.9649

D0 1108.6260 2157.6195 5220.4865

δG2 0.9652 0.8336 0.9719

Wherein, the overhang when overhang is meant photography magnification β=-1/30 times, and overhang with the direction of object one side for just.

[table 8] [conditional respective value]

(1)f3/f1＝0.233

(2)|f2|/f3＝1.047

(3)(D2W-D2T)/(fw·ft) ^1/2＝0.089

(4)(D1T-D1W)/f1＝0.302

(5)|f4|/f1＝0.322

(6)(D1T-D1W)/(D3W-D3T)＝1.409

(7)(f3+|f2|)/(fw·ft) ^1/2＝0.495

Figure 10～Figure 15 is each aberration diagram of variable power optical system of the second embodiment of the present invention, among these figure, Figure 10～Figure 12 represents each aberration diagram under the infinity focus state, each aberration diagram when Figure 13～Figure 15 represents focus state closely (photography magnification β=-1/30 times), in addition in these figure, Figure 10 and Figure 13 show each aberration under the wide-angle side state, Figure 11 and Figure 14 show each aberration under the middle focal length state, and Figure 12 and Figure 15 show each aberration under the telescope end state.

In each aberration diagram of Figure 10～shown in Figure 15, the solid line in the spherical aberration diagram is represented spherical aberration, and dotted line is represented sine condition, and y represents image height, and the solid line among the astigmatism figure is represented radially image planes, and dotted line is represented the meridian image planes.Intelligent image when intelligent image difference figure represents image height y=0,5.4,10.8,15.1,21.6mm is poor, and A represents field angle, and H represents object height.Shown in these aberration diagrams, the variable power optical system of present embodiment can compensate each aberration well, has excellent imaging performance.

(the 3rd embodiment)

Figure 16 is the variable power optical system structural drawing of the third embodiment of the present invention, begins to be followed successively by from object one side: the first lens combination G201, by convex surface is constituted towards the positive lens part of object side and the compound lens L201 of negative lens part; The second lens combination G202 is made of the compound lens L222 of biconcave lens L221, biconvex lens and biconcave lens; The 3rd lens combination G203 makes concave surface constitute towards the combination positive lens L231 and the biconvex lens 232 of the faying face of object side by having; The 4th lens combination G204 is by making convex surface towards as the positive lens L241 of side and concave surface is constituted towards the negative lens L242 of object side.Aperture diaphragm S201 is configured between the second lens combination G202 and the 3rd lens combination G203, and when lens position state during from the wide-angle side state variation to the telescope end state, aperture diaphragm S201 and the 3rd lens combination G203 integrally move.

The value of each unit of the third embodiment of the present invention has been shown in following table 9～table 12.The same with first and second embodiment, the f in each cell list represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and refractive index is and the d line (value that λ=587.6nm) is corresponding.

[table 9] f 38.80～75.34～183.30FNO 3.99～6.21～10.98 ω 29.26～15.48～6.61 (°) face numbering radius-of-curvature face interval refractive index Abbe number

1 47.5258 3.516 1.48749 70.45

2 -56.0972 1.381 1.84666 23.83

3 -106.0453 (D3) 1.0

4 -28.0826 1.004 1.77250 49.61

5 24.9169 0.753 1.0

6 ^* 22.0995 3.956 1.68893 31.16

7 -12.1624 1.004 1.80420 46.51

8 94.4937 (D8) 1.0

9 0.0000 1.256 1.0

10 33.8221 3.140 1.49782 82.52

11 -13.6984 1.005 1.80518 25.46

12 -26.3091 1.130 1.0

13 75.0518 2.637 1.51450 63.05

14 ^* -26.4349 (D14) 1.0

15 ^* 3619.3393 2.763 1.72825 28.31

16 -61.4390 7.660 1.0

17 -15.3827 1.256 1.73400 51.04

18 425.5221 (Bf) 1.0 the 6th, the tenth four sides, the 15 face are aspheric surfaces, and its shape is represented with following formula.

[the 6th face] 1/R=+1/22.0995 κ=1.9417 C4=-1.90305 * 10 ^-6

C6＝+3.49236×10 ^-7 C8＝-9.33533×10 ^-9 C10＝+9.75434×10 ^-11

[the 14th face] 1/R=-1/26.3091 κ=1.3464 C4=+2.25498 * 10 ^-5

C6＝+3.22854×10 ^-7 C8＝-8.27256×10 ^-9 C10＝+7.94160×10 ^-11

[the 15th face] 1/R=+1/3619.3393 κ=11.0000 C4=+1.43908 * 10 ^-5

C6＝+9.51657×10 ^-9 C8＝+3.86881×10 ^-11?C10＝+8.05797×10 ^-13

[table 10] [variable interval table]

f 38.8002 75.3363 183.3010

D3 3.0768 14.6630 29.5856

D8 4.0122 2.8704 1.2600

D14 21.7699 12.0689 2.8980

Bf 7.9388 29.1277 78.7294

[table 11] [overhang δ G2 of second lens combination during focusing]

f 38.8002 75.3363 183.3010

D0 1103.8760 2144.7139 5149.0072

δG2 1.0081 0.9040 1.2037

Wherein, the overhang when overhang is meant photography magnification β=-1/30 times, and overhang with the direction of object one side for just.

[table 12] [conditional respective value]

(1)f3/f1＝0.252

(2)|f2|/f3＝1.009

(3)(D2W-D2T)/(fw·ft) ^1/2＝0.043

(4)(D1T-D1W)/f1＝0.313

(5)|f4|/f1＝0.358

(6)(D1T-D1W)/(D3W-D3T)＝1.326

(7)(f3+|f2|)/(fw·ft) ^1/2＝0.510

Figure 17～Figure 22 is each aberration diagram of variable power optical system of the third embodiment of the present invention, among these figure, Figure 17～Figure 19 represents each aberration diagram under the infinity focus state, each aberration diagram when Figure 20～Figure 22 represents focus state closely (photography magnification β=-1/30 times), in addition in these figure, Figure 17 and Figure 20 show each aberration under the wide-angle side state, Figure 18 and Figure 21 show each aberration under the middle focal length state, and Figure 19 and Figure 22 show each aberration under the telescope end state.

From Figure 17 to each aberration diagram shown in Figure 22, the solid line in the spherical aberration diagram is represented spherical aberration, dotted line is represented sine condition, the solid line among the astigmatism figure is represented radially image planes, dotted line is represented the meridian image planes.Intelligent image when intelligent image difference figure represents image height y=0,5.4,10.8,15.1,21.6mm is poor, and A represents field angle, and H represents object height.Shown in these aberration diagrams, the variable power optical system of present embodiment can compensate each aberration well, has excellent imaging performance.

(the 4th embodiment)

Figure 23 is the lens arrangement figure of the fourth embodiment of the present invention, begins to be followed successively by from object one side: the first lens combination G301, by convex surface is constituted towards the positive lens part of object side and the compound lens L301 of negative lens part; The second lens combination G302 is made of the compound lens L322 of biconcave lens L321, biconvex lens and biconcave lens; The 3rd lens combination G303 makes concave surface constitute towards the combination positive lens L331 and the biconvex lens 332 of the faying face of object side by having; The 4th lens combination G304 is by making convex surface towards as the positive lens L341 of side and concave surface is constituted towards the negative lens L342 of object side.Aperture diaphragm S301 is configured between the second lens combination G302 and the 3rd lens combination G303, and when lens position state during from the wide-angle side state variation to the telescope end state, aperture diaphragm S301 and the 3rd lens combination G303 integrally move.

The value of each unit of the fourth embodiment of the present invention has been shown in following table 13～table 16.The same with first～the 3rd embodiment, the f in each cell list represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and refractive index is and the d line (value that λ=587.6nm) is corresponding.

[table 13] f 38.81～75.35～183.35FNO 3.96～6.19～11.00

29.28～15.48～6.61 (°) face numbering radius-of-curvature face interval refractive index Abbe number

1 47.8034 3.516 1.48749 70.45

2 -54.9592 1.381 1.84666 23.83

3 -103.2755 (D3) 1.0

4 -27.1841 1.005 1.77250 49.61

5 25.8384 0.754 1.0

6 ^* 23.0512 3.830 1.68893 31.16

7 -12.4666 1.005 1.80420 46.51

8 102.5292 (D8) 1.0

9 0.0000 1.256 1.0

10 33.6151 3.140 1.48749 70.45

11 -13.8736 1.005 1.84666 23.83

12 -25.1751 1.130 1.0

13 76.4471 2.637 1.51450 63.05

14 ^*?-26.0362 (D14) 1.0

15 ^*?230.4906 3.077 1.68893 31.16

16 -64.5403 7.284 1.0

17 -15.7104 1.256 1.77250 49.61

18 344.0289 (Bf) 1.0 the 6th, the tenth four sides, the 15 face are aspheric surfaces, and its shape is represented with following formula.

[the 6th face] 1/R=+1/23.0512 κ=1.8286 C4=+1.21080 * 10 ^-6

C6＝+3.38130×10 ^-7 C8＝-8.34260×10 ^-9 C10＝+8.44440×10 ^-11

[the 14th face] 1/R=-1/26.0362 κ=1.3174 C4=+2.31200 * 10 ^-5

C6＝+2.94030×10 ^-7 C8＝-7.48990×10 ^-9 C10＝+7.13870×10 ^-11

[the 15th face] 1/R=+1/230.4906 κ=4.2292 C4=+1.55880 * 10 ^-5

C6＝+1.19210×10 ^-8 C8＝+1.69680×10 ^-11?C10＝+9.96150×10 ^-13

[table 14] [variable interval table]

f 38.8051 75.3501 183.3537

D3 3.0734 14.7292 29.5415

D8 4.8400 3.1203 1.2558

D14 23.4140 13.4834 2.9108

Bf 7.9206 28.6020 78.4385

[table 15] [overhang δ G2 of second lens combination during focusing]

f 38.8051 75.3501 183.3537

D0 1103.8874 2144.7388 5149.0620

δG2 1.0081 0.9040 1.2037

Wherein, the overhang when overhang is meant photography magnification β=-1/30 times, and overhang with the direction of object one side for just.[table 16] [conditional respective value]

(1)f3/f1＝0.254

(2)|f2|/f3＝0·999

(3)(D2W-D2T)/(fw·ft) ^1/2＝0.042

(4)(D1T-D1W)/f1＝0.312

(5)|f4|/f1＝0.363

(6)(D1T-D1W)/(D3W-D3T)＝1.291

(7)(f3+|f2|)/(fw.ft) ^1/2＝0.511

Figure 24～Figure 29 is each aberration diagram of the fourth embodiment of the present invention, among these figure, Figure 24～Figure 26 represents each aberration diagram under the infinity focus state, each aberration diagram when Figure 27～Figure 29 represents focus state closely (photography magnification β=-1/30 times), Figure 24 and Figure 27 show each aberration under the wide-angle side state, Figure 25 and Figure 28 show each aberration under the middle focal length state, and Figure 26 and Figure 20 show each aberration under the telescope end state.In each aberration diagram of Figure 24～shown in Figure 29, the solid line in the spherical aberration diagram is represented spherical aberration, and dotted line is represented sine condition, and y represents the height of picture, and the solid line among the astigmatism figure is represented radially image planes, and dotted line is represented the meridian image planes.Intelligent image when intelligent image difference figure represents image height y=0,5.4,10.8,15.1,21.6mm is poor, and A represents field angle, and H represents object height.Shown in each aberration diagram, the variable power optical system of present embodiment can compensate each aberration well, has excellent imaging performance.

If adopt each above numerical value embodiment, then can realize having high zoom ratios about 5 times, small-sized and can compensate the high performance lens of variable focal length of each aberration well.If particularly will then can provide the lens of variable focal length that is more suitable in heavy caliberization and hypermutation coking or miniaturization from the face farthest of the aperture diaphragm in the 3rd lens combination as aspheric surface.

(the 5th embodiment)

Figure 30 is the structural drawing of the variable power optical system of the fifth embodiment of the present invention.

In variable power optical system shown in Figure 30, the first lens combination G1 begins successively by biconvex lens and concave surface is constituted towards the combination positive lens L1 of the negative planum semilunatum lens of object side from object one side.

In addition, the second lens combination G2 begins successively to be made of the combination positive lens L22 of biconcave lens L21 and biconvex lens and biconcave lens from object one side.

In addition, the 3rd lens combination G3 is by biconvex lens and concave surface is constituted towards the combination positive lens L31 and the biconvex lens L32 of the negative planum semilunatum lens of object side.

In addition, the 4th lens combination G4 begins to be made of the positive planum semilunatum lens L41 and the biconcave lens L42 that make concave surface towards object side successively from object one side.

Therefore, if variable power optical system and the 3rd form of the present invention of the 5th embodiment are considered accordingly, then the 3rd lens combination G3 constitutes lens combination GA, and the 4th lens combination G4 constitutes last lens combination GE.In addition, the biconcave lens L21 among the second lens combination G2 constitutes negative part lens combination G2a, and the combination positive lens L22 among the second lens combination G2 constitutes positive part lens combination G2b.

In addition, aperture diaphragm S is configured between the second lens combination G2 and the 3rd lens combination G3, when from the wide-angle side state when the telescope end state carries out zoom, aperture diaphragm S and the 3rd lens combination G3 integrally move.

Figure 30 represents the position relation of each lens combination under the wide-angle side state, is becoming to the telescope end state.The variable focal length track of representing with arrow in Fig. 1 when burnt moves on optical axis.

In addition,, it is moved along the direction with the optical axis approximate vertical, thereby make image drift moving, the change of the image position that compensation is caused by the vibration of hand etc. constituting combination positive lens L31 in two lens components of the 3rd lens combination G3 as mobile lens group Gs.

In addition, move along optical axis, focus on (focusing) by making the second lens combination G2.

The value of each unit of the fifth embodiment of the present invention has been shown in following table (17).In table (17), f represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and Bf represents back focal length, D0 represent object and between the face of close object side along the distance of optical axis.In addition, the order of the lens face that face numbering expression begins along the travel direction of light from object one side, refractive index and Abbe number are represented respectively and the d line (value that λ=587.6nm) is corresponding.

[table 17] f=36.00～75.00～170.00FNO=3.78～6.29～11.00 ω=31.10～15.54～7.11 (°) face numbering radius-of-curvature face interval refractive index Abbe number

1 54.1928 4.250 1.48749 70.45

2 -52.3691 1.375 1.84666 23.83

3-92.1386 (d3=is variable)

4 -25.5701 1.000 1.80420 46.51

5 26.6803

6 ^* 21.2449 3.500 1.71736 29.50

7 -13.5167 1.000 1.83500 43.97

8 72.4913 (d8=is variable)

9 ∞ 1.250 (aperture diaphragm)

10 34.0724 3.125 1.48749 70.45

11 -13.2038 1.000 1.84666 23.83

12 -23.7313 1.125

13 53.3181 2.625 1.51450 63.05

14 ^*-25.4556 (d14=is variable)

15 ^* -248.6454 2.712 1.68893 31.16

16 -43.5428 7.353

17 -15.2053 1.250 1.77250 49.61

18 549.3023 (Bf) (aspherical surface data)

R κ C4

6 21.2449 1.1736+1.72430 * 10 ^-6

C6 C8 C10

+1.91380×10 ^-7?-3.91910×10 ^-9 +4.47150×10 ^-11

R κ C4

14-25.4556 1.5838+3.34760 * 10 ^-5

C6 C8 C10

+5.06200×10 ^-8?-2.72670×10 ^-10?+1.01290×10 ^-12

R κ C4

15-248.6454-1.2808+1.49020 * 10 ^-5

C6 C8 C10

-3.03490 * 10 ^-8+ 2.80520 * 10 ^-10+ 2.09070 * 10 ^-13(variable interval during zoom)

f 35.9994 74.9983 170.0006

d3 2.8161 15.7797 28.8035

d8 4.2483 2.6490 1.2500

d14 20.8296 10.9664 2.8750

Bf 7.8751 31.1383 (the focusing amount of movement δ G2 of the second lens combination G2 of photography magnification when be-1/30 times) focal distance f 35.9994 74.9983 170.0006D0 1027.5967 2147.3279 4876.9022 amount of movement δ G2 0.8752 0.7208 0.7057 are mobile for just with towards object side of the symbol of amount of movement wherein.The amount of movement Δ s 0.3425 0.4306 0.5605 (conditional respective value) of (the amount of movement Δ s of combination positive lens L31 and the relation of image drift momentum δ s) focal distance f 35.9994 74.9983 170.0006 image drift momentum δ s 0.3600 0.7500 1.7000 lens

fs＝43.9348

f3＝20.5014

βsw＝-0.1794

β3w＝?6.8571

βst＝-0.3525

β3t＝?9.6059

f2a＝-16.0983

f2b＝?66.2384

fvt＝-50.2071

Z＝?4.7223

(8)D/fs ＝0.122

(9)f3/fs ＝0.467

(10)(1-β3t)βst/(1-β3w)βsw/Z＝0.611

(11)|f2a|/f2b ＝0.243

(12)|fvt|/ft ＝0.295

Figure 31 to Figure 36 is and d line (each aberration diagram of the 5th corresponding embodiment of λ=587.6nm).Each aberration diagram when each aberration diagram when each aberration diagram when Figure 31 is an infinity focus state under the wide-angle side state, Figure 32 are infinity focus states under the middle focal length state, Figure 33 are infinity focus states under the telescope end state.

In addition, Figure 34 is photography magnification each aberration diagram for-1/30 times time the under the wide-angle side state, Figure 35 is photography magnification each aberration diagram for-1/30 times time the under the middle focal length state, and Figure 36 is each aberration diagram when being-1/30 times of the photography magnification the telescope end state under.

In addition, Figure 37 to Figure 42 is the intelligent shape aberration diagram when making picture move 0.01rad (radian) with respect to optical axis among the 5th embodiment.Intelligent shape aberration diagram when the intelligent shape aberration diagram when the intelligent shape aberration diagram when Figure 37 is an infinity focus state under the wide-angle side state, Figure 38 are infinity focus states under the middle focal length state, Figure 39 are infinity focus states under the telescope end state.

In addition, Figure 40 is the intelligent shape aberration diagram of photography magnification for-1/30 times time the under the wide-angle side state, Figure 41 is the intelligent shape aberration diagram of photography magnification for-1/30 times time the under the middle focal length state, and Figure 42 is the intelligent shape aberration diagram of the photography magnification the telescope end state under when being-1/30 times.

Each aberration diagram of Figure 37 to Figure 42 represents to make combination positive lens L31 to move and Y=15.0,0 ,-15.0 o'clock intelligent shape aberration diagram along the positive dirction of image height Y.

In each aberration diagram, FNO represents the F number, and NA represents numerical aperture, and Y represents image height, and A represents the angle of half field-of view corresponding with each image height, and H represents the object height corresponding with each image height.

In addition, in the aberration diagram of expression astigmatism, solid line is represented radially image planes, and dotted line is represented the meridian image planes.In addition, in the aberration diagram of expression spherical aberration, dotted line is represented sine condition.

By each aberration diagram as can be known, in the present embodiment, under each photo distance state and under each focal length state, image drift also can compensate each aberration when moving well.

(the 6th embodiment)

Figure 43 is the structural drawing of the variable power optical system of the sixth embodiment of the present invention.

In variable power optical system shown in Figure 43, the first lens combination G1 begins successively by biconvex lens and concave surface is constituted towards the combination positive lens L1 of the negative planum semilunatum lens of object side from object one side.

In addition, the second lens combination G2 begins successively to be made of the combination positive lens L22 of biconcave lens L21 and biconvex lens and biconcave lens from object one side.

In addition, the 3rd lens combination G3 is by biconvex lens and concave surface is constituted towards the combination positive lens L31 and the biconvex lens L32 of the negative planum semilunatum lens of object side.

In addition, the 4th lens combination G4 begins to be made of biconvex lens L41 and biconcave lens L42 successively from object one side.

Therefore, if variable power optical system and the 3rd form of the present invention of the 6th embodiment are considered accordingly, then the 3rd lens combination G3 constitutes lens combination GA, and the 4th lens combination G4 constitutes last lens combination GE.In addition, the biconcave lens L21 among the second lens combination G2 constitutes negative part lens combination G2a, and the combination positive lens L22 among the second lens combination G2 constitutes positive part lens combination G2b.

In addition, aperture diaphragm S is configured between the second lens combination G2 and the 3rd lens combination G3, when from the wide-angle side state when the telescope end state carries out zoom, aperture diaphragm S and the 3rd lens combination G3 integrally move.

Figure 43 represents the position relation of each lens combination under the wide-angle side state, and to telescope end state zoom the time, the variable focal length track of representing with arrow in Fig. 1 moves on optical axis.

In addition,, it is moved along the direction with the optical axis approximate vertical, thereby make image drift moving, the change of the image position that compensation is caused by the vibration of hand etc. constituting combination positive lens L31 in two lens components of the 3rd lens combination G3 as mobile lens group Gs.

In addition, move along optical axis, focus on (focusing) by making the second lens combination G2.

The value of each unit of the sixth embodiment of the present invention has been shown in following table (18).In table (18), f represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and Bf represents back focal length, D0 represent object and between the face of close object side along the distance of optical axis.In addition, the order of the lens face that face numbering expression begins along the travel direction of light from object one side, refractive index and Abbe number are represented respectively and the d line (value that λ=587.6nm) is corresponding.

[table 18] f=38.93～75.60～183.96FN0=3.85～6.14～11.00 ω=28.78～15.43～6.58 ° face numbering radius-of-curvature face is the refractive index Abbe number at interval

1 51.8167 4.284 1.48749 70.45

2 -53.7693 1.386 1.84666 23.83

3-97.0444 (d3=is variable)

4 -26.4310 1.008 1.77250 49.61

5 33.0387 0.756

6 ^× 22.2667 3.528 1.68893 31.16

7 -13.3299 1.008 1.80420 46.51

8 53.2684 (d8=is variable)

9 ∞ 1.260 (aperture diaphragm)

10 33.7458 3.150 1.48749 70.45

11 -14.0844 1.008 1.84666 23.83

12 -25.9907 1.134

13 51.2297 2.646 1.51450

14 ^*-25.9086 (d14=is variable)

15 ^* 325.0348 3.098 1.68893 31.16

16 -60.6443 6.915

17 -14.3830 1.260 1.77250 49.61

18 3325.718 (Bf) (aspherical surface data)

R κ C4

6 22.2667 1.4465+1.32815 * 10 ^-6

C6 C8 C10

+2.29845×10 ^-7?-4.26665×10 ^-9?+3.87369×10 ^-11

R κ C4

14-25.9086 1.3985+2.83877 * 10 ^-5

C6 C8 C10

+2.11412×10 ^-7?-3.76902×10 ^-9?+2.80604×10 ^-11

R κ C4

15 325.0348 11.0000+1.95413 * 10 ^-5

C6 C8 C10

+ 4.87122 * 10 ^-8-3.67858 * 10 ^-10+ 3.55599 * 10 ^-12(variable interval during zoom)

f 38.9344 75.6011 183.9649

d3 3.0033 14.6630 29.5856

d8 4.0122 2.8704 1.2600

d14 21.7699 12.0689 2.8980

Bf 7.9388 29.1277 78.7294 (the focusing amount of movement δ G2 of the second lens combination G2 of photography magnification when be-1/30 times) focal distance f 38.9344 75.6011 183.9649D0 1108.6260 2157.6195 5220.4865 amount of movement δ G2 0.9652 0.8336 0.9719 wherein, the symbol of amount of movement mobile for just with towards object side.The amount of movement Δ s 0.3825 0.4667 0.6338 (conditional respective value) of (the amount of movement Δ s of combination positive lens L31 and the relation of image drift momentum δ s) focal distance f 38.9344 75.6011 183.9649 image drift momentum δ s 0.3893 0.7560 1.8397 lens

fs＝46.5407

f3＝20.4769

βsw＝-0.2130

β3w＝?5.7660

βst＝-0.3194

β3t＝10.0910

f2a＝-18.8689

f2b＝122.0734

fvt＝-57.08654

Z＝?4.7250

(8)D/fs ＝0.116

(9)f3/fs ＝0.440

(1?0)(1-β3t)βst/(1-β3w)βsw/Z＝0.605

(11)|f2a|/f2b ＝0.155

(12)|fvt|/ft ＝0.310

Figure 44 to Figure 49 is and d line (each aberration diagram of the 6th corresponding embodiment of λ=587.6nm).Each aberration diagram when each aberration diagram when each aberration diagram when Figure 44 is an infinity focus state under the wide-angle side state, Figure 45 are infinity focus states under the middle focal length state, Figure 46 are infinity focus states under the telescope end state.

In addition, Figure 47 is photography magnification each aberration diagram for-1/30 times time the under the wide-angle side state, Figure 48 is photography magnification each aberration diagram for-1/30 times time the under the middle focal length state, and Figure 49 is each aberration diagram when being-1/30 times of the photography magnification the telescope end state under.

In addition, Figure 50 to Figure 55 is the intelligent shape aberration diagram when making picture move 0.01rad (radian) with respect to optical axis among the 6th embodiment.Intelligent shape aberration diagram when the intelligent shape aberration diagram when the intelligent shape aberration diagram when Figure 50 is an infinity focus state under the wide-angle side state, Figure 51 are infinity focus states under the middle focal length state, Figure 52 are infinity focus states under the telescope end state.

In addition, Figure 53 is the intelligent shape aberration diagram of photography magnification for-1/30 times time the under the wide-angle side state, Figure 54 is the intelligent shape aberration diagram of photography magnification for-1/30 times time the under the middle focal length state, and Figure 55 is the intelligent shape aberration diagram of the photography magnification the telescope end state under when being-1/30 times.

Each aberration diagram of Figure 50 to Figure 55 represents to make combination positive lens L31 to move and Y=15.0,0 ,-15.0 o'clock intelligent shape aberration diagram along the positive dirction of image height Y.

In each aberration diagram, FNO represents the F number, and NA represents numerical aperture, and Y represents image height, and A represents the angle of half field-of view corresponding with each image height, and H represents the object height corresponding with each image height.

In addition, in the aberration diagram of expression astigmatism, solid line is represented radially image planes, and dotted line is represented the meridian image planes.In addition, in the aberration diagram of expression spherical aberration, dotted line is represented sine condition.

By each aberration diagram as can be known, in the present embodiment, under each photo distance state and under each focal length state, image drift also can compensate each aberration when moving well.

(the 7th embodiment)

Figure 56 is the structural drawing of the variable power optical system of the seventh embodiment of the present invention.

In the variable power optical system shown in Figure 56, the first lens combination G1 begins successively by biconvex lens and concave surface is constituted towards the combination positive lens L1 of the negative planum semilunatum lens of object side from object one side.

In addition, the second lens combination G2 begins successively to be made of the combination positive lens L22 of biconcave lens L21 and biconvex lens and biconcave lens from object one side.

In addition, the 3rd lens combination G3 is by biconvex lens and concave surface is constituted towards the combination positive lens L31 and the biconvex lens L32 of the negative planum semilunatum lens of object side.

In addition, the 4th lens combination G4 begins to be made of biconvex lens L41 and biconcave lens L42 successively from object one side.

Therefore, if variable power optical system and the 3rd form of the present invention of the 7th embodiment are considered accordingly, then the 3rd lens combination G3 constitutes lens combination GA, and the 4th lens combination G4 constitutes last lens combination GE.In addition, the biconcave lens L21 among the second lens combination G2 constitutes negative part lens combination G2a, and the combination positive lens L22 among the second lens combination G2 constitutes positive part lens combination G2b.68 in addition, and aperture diaphragm S is configured between the second lens combination G2 and the 3rd lens combination G3, when from the wide-angle side state when the telescope end state carries out zoom, aperture diaphragm S and the 3rd lens combination G3 integrally move.

Figure 56 represents the position relation of each lens combination under the wide-angle side state, and to telescope end state zoom the time, the variable focal length track of representing with arrow in Fig. 1 moves on optical axis.

In addition,, it is moved along the direction with the optical axis approximate vertical, thereby make image drift moving, the change of the image position that compensation is caused by the vibration of hand etc. constituting combination positive lens L31 in two lens components of the 3rd lens combination G3 as mobile lens group Gs.

In addition, move along optical axis, focus on (focusing) by making the second lens combination G2.

The value of each unit of the seventh embodiment of the present invention has been shown in following table (19).In table (19), f represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and Bf represents back focal length, D0 represent object and between the face of close object side along the distance of optical axis.In addition, the order of the lens face that face numbering expression begins along the travel direction of light from object one side, refractive index and Abbe number are represented respectively and the d line (value that λ=587.6nm) is corresponding.

[table 19] f=38.80～75.34～183.30FNO=3.99～6.21～10.98 ω=29.26～15.48～6.61 ° face numbering radius-of-curvature face is the refractive index Abbe number at interval

1 47.5258 3.516 1.48749 70.45

2 -56.0972 1.381 1.84666 23.83

3-106.0453 (d3=is variable)

4 -28.0826 1.004 1.77250 49.61

5 24.9169 0.753

6 ^* 22.0995 3.956 1.68893 31.16

7 -12.1624 1.004 1.80420 46.51

8 94.4937 (d8=is variable)

9 ∞ 1.256 (aperture diaphragm)

10 33.8221 3.140 1.49782 82.52

11 -13.6984 1.005 1.80518 25.46

12 -26.3091 1.130

13 75.0518 2.637 1.51450 63.05

14 ^*-26.4349 (d14=is variable)

15 ^*?3619.3393 2.763 1.72825 28.31

16 -61.4390 7.660

17 -15.3827 1.256 1.73400 51.04

18 425.5221 (Bf) (aspherical surface data)

6 22.0995 1.9417-1.90305 * 10 of R κ C4 ^-6

C6 C8 C10

+3.49236×10 ^-7?-9.33533×10 ^-9?+9.75434×10 ^-11

14-26.4349 1.3464+2.25498 * 10 of R κ C4 ^-5

C6 C8 C10

+3.22854×10 ^-7?-8.27256×10 ^-9?+7.94160×10 ^-11

15 3619.3393 11.0000+1.43908 * 10 of R κ C4 ^-5

C6 C8 C10

+ 9.51657 * 10 ^-9+ 3.86881 * 10 ^-11+ 8.05797 * 10 ^-13(variable interval during zoom)

f 38.8002 75.3363 183.3010

d3 3.0768 14.6630 29.5856

d8 4.0122 2.8704 1.2600

d14 21.7699 12.0689 2.8980

Bf 7.9388 29.1277 78.7294 (the focusing amount of movement δ G2 of the second lens combination G2 of photography magnification when be-1/30 times) focal distance f 38.8002 75.3363 183.3010D0 1103.8760 2144.7139 5149.0072 amount of movement δ G2 1.0081 0.9040 1.2037 wherein, the symbol of amount of movement mobile for just with towards object side.The amount of movement Δ s 0.3568 0.4445 0.6138 (conditional respective value) of (the amount of movement Δ s of combination positive lens L31 and the relation of image drift momentum δ s) focal distance f 38.8002 75.3363 183.3010 image drift momentum δ s 0.3880 0.7535 1.8336 lens

fs＝46.9493

f3＝21.4158

βsw＝-0.0927

β3w＝+12.9804

βst＝ 0.0041

β3t＝-737.193

f2a＝-16.9507

f2b＝+68.4681

fvt＝-60.15135

Z?＝?4.7242

(8)D/fs ＝0.123

(9)f3/fs ＝0.456

(10)(1-β3t)βst/(1-β3w)βsw/Z＝0.582

(11)|f2a|/f2b ＝0.248

(12)|fvt|/ft ＝0.328

Figure 57 to Figure 62 is and d line (each aberration diagram of the 7th corresponding embodiment of λ=587.6nm).Each aberration diagram when each aberration diagram when each aberration diagram when Figure 57 is an infinity focus state under the wide-angle side state, Figure 58 are infinity focus states under the middle focal length state, Figure 59 are infinity focus states under the telescope end state.

In addition, Figure 60 is photography magnification each aberration diagram for-1/30 times time the under the wide-angle side state, Figure 61 is photography magnification each aberration diagram for-1/30 times time the under the middle focal length state, and Figure 62 is each aberration diagram when being-1/30 times of the photography magnification the telescope end state under.

In addition, Figure 63 to Figure 68 is the intelligent shape aberration diagram when making picture move 0.01rad (radian) with respect to optical axis among the 7th embodiment.Intelligent shape aberration diagram when the intelligent shape aberration diagram when the intelligent shape aberration diagram when Figure 63 is an infinity focus state under the wide-angle side state, Figure 64 are infinity focus states under the middle focal length state, Figure 65 are infinity focus states under the telescope end state.

In addition, Figure 66 is the intelligent shape aberration diagram of photography magnification for-1/30 times time the under the wide-angle side state, Figure 67 is the intelligent shape aberration diagram of photography magnification for-1/30 times time the under the middle focal length state, and Figure 68 is the intelligent shape aberration diagram of the photography magnification the telescope end state under when being-1/30 times.

Each aberration diagram of Figure 63 to Figure 68 represents to make combination positive lens L31 to move and Y=15.0,0 ,-15.0 o'clock intelligent shape aberration diagram along the positive dirction of image height Y.

In each aberration diagram, FNO represents the F number, and NA represents numerical aperture, and Y represents image height, and A represents the angle of half field-of view corresponding with each image height, and H represents the object height corresponding with each image height.

In addition, in the aberration diagram of expression astigmatism, solid line is represented radially image planes, and dotted line is represented the meridian image planes.In addition, in the aberration diagram of expression spherical aberration, dotted line is represented sine condition.

By each aberration diagram as can be known, in the present embodiment, under each photo distance state and under each focal length state, image drift also can compensate each aberration when moving well.

(the 8th embodiment)

Figure 69 is the structural drawing of the variable power optical system of the eighth embodiment of the present invention.

In the variable power optical system shown in Figure 69, the first lens combination G1 begins successively by biconvex lens and concave surface is constituted towards the combination positive lens L1 of the negative planum semilunatum lens of object side from object one side.

In addition, the second lens combination G2 begins successively to be made of the combination positive lens L22 of biconcave lens L21 and biconvex lens and biconcave lens from object one side.

In addition, the 3rd lens combination G3 is by biconvex lens and concave surface is constituted towards the combination positive lens L31 and the biconvex lens L32 of the negative planum semilunatum lens of object side.

In addition, the 4th lens combination G4 begins to be made of biconvex lens L41 and biconcave lens L42 successively from object one side.

Therefore, if variable power optical system and the 3rd form of the present invention of the 8th embodiment are considered accordingly, then the 3rd lens combination G3 constitutes lens combination GA, and the 4th lens combination G4 constitutes last lens combination GE.In addition, the biconcave lens L21 among the second lens combination G2 constitutes negative part lens combination G2a, and the combination positive lens L22 among the second lens combination G2 constitutes positive part lens combination G2b.

In addition, aperture diaphragm S is configured between the second lens combination G2 and the 3rd lens combination G3, when from the wide-angle side state when the telescope end state carries out zoom, aperture diaphragm S and the 3rd lens combination G3 integrally move.

Figure 69 represents the position relation of each lens combination under the wide-angle side state, and to telescope end state zoom the time, the variable focal length track of representing with arrow in Fig. 1 moves on optical axis.

In addition,, it is moved along the direction with the optical axis approximate vertical, thereby make image drift moving, the change of the image position that compensation is caused by the vibration of hand etc. constituting combination positive lens L31 in two lens components of the 3rd lens combination G3 as mobile lens group Gs.

In addition, move along optical axis, focus on (focusing) by making the second lens combination G2.

The value of each unit of the eighth embodiment of the present invention has been shown in following table (20).In table (20), f represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and Bf represents back focal length, D0 represent object and between the face of close object side along the distance of optical axis.In addition, the order of the lens face that face numbering expression begins along the travel direction of light from object one side, refractive index and Abbe number are represented respectively and the d line (value that λ=587.6nm) is corresponding.

[table 20] f=38.81～75.35-183.35FNO=3.96～6.19～11.00 ω=29.28～15.48～6.61 ° face numbering radius-of-curvature face is the refractive index Abbe number at interval

1 47.8034 3.516 1.48749 70.45

2 -54.9592 1.381 1.84666 23.83

3-103.2755 (d3=is variable)

4 -27.1841 1.005 1.77250 49.61

5 25.8284 0.754

6 ^* 23.0512 3.830 1.68893 31.16

7 -12.4666 1.005 1.80420 46.51

8 102.5292 (d8=is variable)

9 ∞ 1.256 (aperture diaphragm)

10 33.6151 3.140 1.48749 70.45

11 -13.8736 1.005 1.84666 23.83

12 -25.1751 1.130

13 76.4471 2.637 1.15450 63.05

14 ^*-26.0362 (d14=is variable)

15 ^*?230.4906 3.077 1.68893 31.16

16 -64.5403 7.284

17 -15.7104 1.256 1.77250 49.61

18 344.0289 (Bf) (aspherical surface data)

R κ C4

6 23.0512 1.8286+1.21080 * 10 ^-6

C6 C8 C10

+3.38130×10 ^-7?-8.34260×10 ^-9 +8.44440×10 ^-11

R κ C4

14-26.0362 1.3174+2.31200 * 10 ^-5

C6 C8 C10

+2.94030×10 ^-7?-7.48990×10 ^-9 +7.13870×10 ^-11

R κ C4

15 230.4906 4.2292+1.55880 * 10 ^-5

C6 C8 C10

+ 1.19210 * 10 ^-8+ 1.69680 * 10 ^-11+ 9.96150 * 10 ^-13(variable interval during zoom)

f 38.8051 75.3501 183.3537

d3 3.0734 14.7292 29.5415

d8 4.8400 3.1203 1.2558

d14 23.4140 13.4834 2.9108

Bf 7.9206 28.6020 78.4385 (the focusing amount of movement δ G2 of the second set of lenses G2 of photography magnifying power when be-1/30 times) focal distance f 38.8051 75.3501 183.3537D0 1103.8874 2411.7388 5149.0620 amount of movement δ G2 1.0081 0.9040 1.2037 wherein, the symbol of amount of movement is take towards the movement of the object side amount of movement Δ s 0.3492 0.4362 0.6008 (conditional respective value) as focal distance f 38.8051 75.3501 183.3537 image drift momentum δ s 0.3880 0.7532 1.8331 lens that just (make up the amount of movement Δ s of positive lens 131 and the relation of image drift momentum δ s)

fs＝45.0429

f3＝21.5586

βsw＝-0.1236

β3w＝?9.8010

βst＝-0.0759

β3t＝40.3589

f2a＝-17.0079

f2b＝+71.1832

fvt＝-59.8488

Z?＝?4.7250

(8)D/fs ＝0.123

(9)f3/fs ＝0.479

(10)(1-β3t)βst/(1-β3w)βsw/Z＝0.581

(11)|f2a|/f2b ＝0.239

(12)|fvt|/ft ＝0.326

Figure 70 to Figure 75 is and d line (each aberration diagram of the 6th corresponding embodiment of λ=587.6nm).Each aberration diagram when each aberration diagram when each aberration diagram when Figure 70 is an infinity focus state under the wide-angle side state, Figure 71 are infinity focus states under the middle focal length state, Figure 72 are infinity focus states under the telescope end state.

In addition, Figure 73 is photography magnification each aberration diagram for-1/30 times time the under the wide-angle side state, Figure 74 is photography magnification each aberration diagram for-1/30 times time the under the middle focal length state, and Figure 75 is each aberration diagram when being-1/30 times of the photography magnification the telescope end state under.

In addition, Figure 76 to Figure 81 is the intelligent shape aberration diagram when making picture move 0.01rad (radian) with respect to optical axis among the 8th embodiment.Intelligent shape aberration diagram when the intelligent shape aberration diagram when the intelligent shape aberration diagram when Figure 76 is an infinity focus state under the wide-angle side state, Figure 77 are infinity focus states under the middle focal length state, Figure 78 are infinity focus states under the telescope end state.

In addition, Figure 79 is the intelligent shape aberration diagram of photography magnification for-1/30 times time the under the wide-angle side state, Figure 80 is the intelligent shape aberration diagram of photography magnification for-1/30 times time the under the middle focal length state, and Figure 81 is the intelligent shape aberration diagram of the photography magnification the telescope end state under when being-1/30 times.

Each aberration diagram of Figure 76 to Figure 81 represents to make combination positive lens L31 to move and Y=15.0,0 ,-15.0 o'clock intelligent shape aberration diagram along the positive dirction of image height Y.

In each aberration diagram, FNO represents the F number, and NA represents numerical aperture, and Y represents image height, and A represents the angle of half field-of view corresponding with each image height, and H represents the object height corresponding with each image height.

In addition, in the aberration diagram of expression astigmatism, solid line is represented radially image planes, and dotted line is represented the meridian image planes.In addition, in the aberration diagram of expression spherical aberration, dotted line is represented sine condition.

By each aberration diagram as can be known, in the present embodiment, under each photo distance state and under each focal length state, image drift also can compensate each aberration when moving well.

If adopt above each embodiment, then can realize being suitable for small-sized, high-performance, zoom ratio is the moving possible variable power optical system of image drift of the hypermutation coking about 5 times.In addition, by a plurality of aspheric surfaces are imported in the lens combination of variable power optical system, can further reach heavy caliber, hypermutation coking and miniaturization certainly.

(the 9th embodiment)

Figure 82 is the structural drawing of the variable power optical system of the ninth embodiment of the present invention, begins to be followed successively by from object one side: the first lens combination G1, by convex surface is constituted towards the positive lens part of object side and the compound lens L1 of negative lens part; The second lens combination G2 is made of the compound lens L22 of biconcave lens L21 and biconvex lens and biconcave lens; The 3rd lens combination G3 makes concave surface constitute towards the combination positive lens L31 and the biconvex lens 32 of the faying face of object side by having; The 4th lens combination G4 is by making convex surface towards as the positive lens L41 of side with concave surface is constituted towards the negative lens L42 of object side.Aperture diaphragm S is configured between the second lens combination G2 and the 3rd lens combination G3, and when lens position state during from the wide-angle side state variation to the telescope end state, aperture diaphragm S and the 3rd lens combination G3 integrally move.

The value of each unit of the ninth embodiment of the present invention has been shown in following table 21.F in each cell list of embodiment represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and refractive index is and the d line (value that λ=587.6nm) is corresponding.

[table 21] f 36.00～75.00～170.00FNO 3.78～6.29～11.00 ω 31.10～15.54～7.11 (°) face numbering radius-of-curvature face interval refractive index Abbe number

1 54.1928 4.250 1.48749 70.45

2 -52.3691 1.375 1.84666 23.83

3 -92.1386 (D3) 1.0

4 -25.5701 1.000 1.80420 46.51

5 26.6803 1.000 1.0

6 ^* 21.2449 3.500 1.71736 29.50

7 -13.5167 1.000 1.83500 42.97

8 72.4913 (D8) 1.0

9 0.0000 1.250 1.0

10 34.0724 3.125 1.48749 70.45

11 -13.2038 1.000 1.84666 23.83

12 -23.7313 1.125 1.0

13 53.3181 2.625 1.51450 63.05

14 ^*?-25.4556 (D14) 1.0

15 ^*?-248.6454 2.712 1.68893 31.16

16 -43.5428 7.353 1.0

17 -15.2053 1.250 1.77250 49.61

18 549.3023 (Bf) 1.0 the 6th, the tenth four sides, the 15 face are aspheric surfaces, and its shape is expressed from the next.

[the 6th face] 1/R=+1/21.2449 κ=1.1736

C4＝+1.72430×10 ^-6

C6＝+1.91380×10 ^-7

C8＝-3.91910×10 ^-9

C10＝+4.47150×10 ^-11

[the 14th face] 1/R=-1/25.4556 κ=1.5838

C4＝+3.34760×10 ^-5

C6＝+5.06200×10 ^-8

C8＝-2.72670×10 ^-10

C10＝+1.01290×10 ^-12

[the 15th face] 1/R=-1/248.6454 κ=-1.2808

C4?＝+1.49020×10 ^-5

C6?＝-3.03490×10 ^-8

C8?＝+2.80520×10 ^-10

C10=+2.09070 * 10 ^-13(variable interval table)

f 35.9994 74.9983 170.0006

D3 2.8161 15.7797 28.8035

D8 4.2483 2.6490 1.2500

D14 20.8296 10.9664 2.8750

Bf 7.8751 31.1383 78.2651 (the overhang δ G2 of second lens combination during focusing)

f 35.9994 74.9983 170.0006

D0 1027.5967 2147.3279 4876.9022

δ G2 0.8752 0.7208 0.7057 wherein, overhang is the overhang of photography magnification for-1/30 times the time, overhang with the direction of object side for just.(conditional respective value)

β2T＝-0.5649

β2W＝-0.3292

β4T＝1.2015

β4W＝3.6171

(13)(Ra-Rb)/(Ra+Rb)＝0.113

(14)(Δ2/f1)/(ft/fw)＝0.062

(15)(β2T/β2W)/Z＝0.363

(16)|R4|/D＝2.379

(17)(β4T/β4W)/Z＝0.638

Figure 83 to Figure 88 is each aberration diagram of the ninth embodiment of the present invention, each aberration diagram when Figure 83 to Figure 85 represents the infinity focus state, each aberration diagram when Figure 86 to Figure 88 represents focus state closely (the photography magnification is-1/30 times), each aberration diagram when Figure 83 and Figure 86, Figure 84 and Figure 87, Figure 85 and Figure 88 represent wide-angle side state, middle focal length state, telescope end state respectively.

In each aberration diagram shown in Figure 83 to Figure 88, the solid line in the spherical aberration diagram is represented spherical aberration, and dotted line is represented sine condition, and Y represents image height, and the solid line among the astigmatism figure is represented radially image planes, and dotted line is represented the meridian image planes.Intelligent image difference figure represents that image height y=0,5.4,10.8,15.1,21.6 o'clock intelligent image are poor, and A represents field angle, and H represents object height.

By each aberration diagram as can be known, can compensate each aberration well in the present embodiment, have excellent imaging performance.

(the tenth embodiment)

Figure 89 is the lens arrangement figure of the tenth embodiment of the present invention, begins to be followed successively by from object one side: the first lens combination G1, by convex surface is constituted towards the positive lens part of object side and the compound lens L1 of negative lens part; The second lens combination G2 is made of the compound lens L22 of biconcave lens L21 and biconvex lens and biconcave lens; The 3rd lens combination G3 makes concave surface constitute towards the combination positive lens L31 and the biconvex lens 32 of the faying face of object side by having; The 4th lens combination G4 is by making convex surface towards as the positive lens L41 of side with concave surface is constituted towards the negative lens L42 of object side.Aperture diaphragm S is configured between the second lens combination G2 and the 3rd lens combination G3, and when lens position state during from the wide-angle side state variation to the telescope end state, aperture diaphragm S and the 3rd lens combination G3 integrally move.

The value of each unit of the tenth embodiment of the present invention has been shown in following table 22.F in each cell list of embodiment represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and refractive index is and the d line (value that λ=587.6nm) is corresponding.

[table 22] f 38.93～75.60～183.96FNO 3.85～6.14～11.00 ω 28.78～15.43～6.58 (°) face numbering radius-of-curvature face interval refractive index Abbe number

1 51.8167 4.284 1.48749 70.45

2 -53.7693 1.386 1.84666 23.83

3 -97.0444 (D3) 1.0

4 -26.4310 1.008 1.77250 49.61

5 33.0387 0.756 1.0

6 ^* 22.2667 3.528 1.68893 31.16

7 -13.3299 1.008 1.80420 46.51

8 53.2684 (D8) 1.0

9 0.0000 1.260 1.0

10 33.7458 3.150 1.48749 70.45

11 -14.0844 1.008 1.84666 23.83

12 -25.9907 1.134 1.0

13 51.2297 2.646 1.51450 63.05

14 ^*?-25.9086 (D14) 1.0

15 ^*?325.0348 3.098 1.68893 31.16

16 -60.6443 6.915 1.0

17 -14.3830 1.260 1.77250 49.61

18 3325.7186 (Bf) 1.0 the 6th, the tenth four sides, the 15 face are aspheric surfaces, and its shape is expressed from the next.

[the 6th face] 1/R=+1/22.2667 κ=1.4465

C4?＝+1.32815×10 ^-6

C6?＝+2.29845×10 ^-7

C8?＝-4.26665×10 ^-9

C10＝+3.87369×10 ^-11

[the 14th face] 1/R=-1/25.9086 κ=1.3985

C4?＝+2.83877×10 ^-5

C6?＝+2.11412×10 ^-7

C8?＝-3.76902×10 ^-9

C10＝+2.80604×10 ^-11

[the 15th face] 1/R=+1/325.0348 κ=11.0000

C4?＝+1.95413×10 ^-5

C6?＝+4.87122×10 ^-8

C8?＝-3.67858×10 ^-10

C10=+3.55599 * 10 ^-12(variable interval table)

f 38.9344 75.6011 183.9649

D3 3.0033 14.6630 29.5856

D8 4.0122 2.8704 1.2600

D14 21.7699 12.0689 2.8980

Bf 7.9388 29.1277 78.7294 (the overhang δ G2 of second lens combination during focusing)

f 38.9344 75.6011 183.9649

D0 1108.6260 2157.6195 5220.4865

δ G2 0.9652 0.8336 0.9719 wherein, overhang is the overhang of photography magnification for-1/30 times the time, overhang with the direction of object side for just.(conditional respective value)

β2T＝-0.6495

β2W＝-0.3598

β4T＝1.2083

β4W＝3.7065

(13)(Ra-Rb)/(Ra+Rb)＝0.195

(14)(Δ2/f1)/(ft/fw)＝0.064

(15)(β2T/β2W)/Z＝0.382

(16)|R4|/D＝2.563

(17)(β4T/β4W)/Z＝0.649

Figure 90 to Figure 95 is each aberration diagram of the tenth embodiment of the present invention, each aberration diagram when Figure 90 to Figure 92 represents the infinity focus state, each aberration diagram when Figure 93 to Figure 95 represents focus state closely (the photography magnification is-1/30 times), each aberration diagram when Figure 90 and Figure 93, Figure 91 and Figure 94, Figure 92 and Figure 95 represent wide-angle side state, middle focal length state, telescope end state respectively.

In each aberration diagram shown in Figure 90 to Figure 95, the solid line in the spherical aberration diagram is represented spherical aberration, and dotted line is represented sine condition, and Y represents image height, and the solid line among the astigmatism figure is represented radially image planes, and dotted line is represented the meridian image planes.Intelligent image difference figure represents that image height y=0,5.4,10.8,15.1,21.6 o'clock intelligent image are poor, and A represents field angle, and H represents object height.

By each aberration diagram as can be known, can compensate each aberration well in the present embodiment, have excellent imaging performance.

(the 11 embodiment)

Figure 96 is the lens arrangement figure of the 11st embodiment of the present invention, begins to be followed successively by from object one side: the first lens combination G1, by convex surface is constituted towards the positive lens part of object side and the compound lens L1 of negative lens part; The second lens combination G2 is made of the compound lens L22 of biconcave lens L21 and biconvex lens and biconcave lens; The 3rd lens combination G3 makes concave surface constitute towards the combination positive lens L31 and the biconvex lens 32 of the faying face of object side by having; The 4th lens combination G4 is by making convex surface towards as the positive lens L41 of side with concave surface is constituted towards the negative lens L42 of object side.Aperture diaphragm S is configured between the second lens combination G2 and the 3rd lens combination G3, and when lens position state during from the wide-angle side state variation to the telescope end state, aperture diaphragm S and the 3rd lens combination G3 integrally move.

The value of each unit of the 11st embodiment of the present invention has been shown in following table 23.F in each cell list of embodiment represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and refractive index is and the d line (value that λ=587.6nm) is corresponding.

[table 23] f 38.80～75.34～183.30FNO 3.99～6.21～10.98 ω 29.26～15.48～6.61 (°) face numbering radius-of-curvature face interval refractive index Abbe number

1 47.5258 3.516 1.48749 70.45

2 -56.0972 1.381 1.84666 23.83

3 -106.0453 (D3) 1.0

4 -28.0826 1.004 1.77250 49.61

5 24.9169 0.753 1.0

6 ^* 22.0995 3.956 1.68893 31.16

7 -12.1624 1.004 1.80420 46.51

8 94.4937 (D8) 1.0

9 0.0000 1.256 1.0

10 33.8221 3.140 1.49782 82.52

11 -13.6984 1.005 1.80518 25.46

12 -26.3091 1.130 1.0

13 75.0518 2.637 1.51450 63.05

14 ^*?-26.4349 (D14) 1.0

15 ^*?3619.3393 2.763 1.72825 28.31

16 -61.4390 7.660 1.0

17 -15.3827 1.256 1.73400 51.04

18 425.5221 (Bf) 1.0 the 6th, the tenth four sides, the 15 face are aspheric surfaces, and its shape is expressed from the next.

[the 6th face] 1/R=+1/22.0995 κ=1.9417

C4?＝-1.90305×10 ^-6

C6?＝+3.49236×10 ^-7

C8?＝-9.33533×10 ^-9

C10＝+9.75434×10 ^-11

[the 14th face] 1/R=-1/26.3091 κ=1.3464

C4?＝+2.25498×10 ^-5

C6?＝+3.22854×10 ^-7

C8?＝-8.27256×10 ^-9

C10＝+7.94160×10 ^-11

[the 15th face] 1/R=+1/3619.3393 κ=11.0000

C4?＝+1.43908×10 ^-5

C6?＝+9.51657×10 ^-9

C8?＝+3.86881×10 ^-11

C10=+8.05797 * 10 ^-13(variable interval table)

f 38.8002 75.3363 183.3010

D3 3.0768 14.6630 29.5856

D8 4.0122 2.8704 1.2600

D14 21.7699 12.0689 2.8980

Bf 7.9388 29.1277 78.7294 (the overhang δ G2 of second lens combination during focusing)

f 38.8002 75.3363 183.3010

D0 1103.8760 2144.7139 5149.0072

δ G2 1.0081 0.9040 1.2037 wherein, overhang is the overhang of photography magnification for-1/30 times the time, overhang with the direction of object side for just.(conditional respective value)

β2T＝-0.7084

β2W＝-0.3795

β4T＝1.1900

β4W＝3.5021

(13)(Ra-Rb)/(Ra+Rb)＝0.060

(14)(Δ2/f1)/(ft/fw)＝0.066

(15)(β2T/β2W)/Z＝0.395

(16)|R4|/D＝2.414

(17)(β4T/β4W)/Z＝0.623

Figure 97 to Figure 102 is each aberration diagram of the 11st embodiment of the present invention, each aberration diagram when Figure 97 to Figure 99 represents the infinity focus state, each aberration diagram when Figure 100 to Figure 102 represents focus state closely (the photography magnification is-1/30 times), each aberration diagram when Figure 97 and Figure 100, Figure 98 and Figure 101, Figure 99 and Figure 102 represent wide-angle side state, middle focal length state, telescope end state respectively.

In each aberration diagram shown in Figure 97 to Figure 102, the solid line in the spherical aberration diagram is represented spherical aberration, and dotted line is represented sine condition, and Y represents image height, and the solid line among the astigmatism figure is represented radially image planes, and dotted line is represented the meridian image planes.Intelligent image difference figure represents that image height y=0,5.4,10.8,15.1,21.6 o'clock intelligent image are poor, and A represents field angle, and H represents object height.

By each aberration diagram as can be known, can compensate each aberration well in the present embodiment, have excellent imaging performance.

(the 12 embodiment)

Figure 103 is the lens arrangement figure of the 12nd embodiment of the present invention, begins to be followed successively by from object one side: the first lens combination G1, by convex surface is constituted towards the positive lens part of object side and the compound lens L1 of negative lens part; The second lens combination G2 is made of the compound lens L22 of biconcave lens L21 and biconvex lens and biconcave lens; The 3rd lens combination G3 makes concave surface constitute towards the combination positive lens L31 and the biconvex lens 32 of the faying face of object side by having; The 4th lens combination G4 is by making convex surface towards as the positive lens L41 of side with concave surface is constituted towards the negative lens L42 of object side.Aperture diaphragm S is configured between the second lens combination G2 and the 3rd lens combination G3, and when lens position state during from the wide-angle side state variation to the telescope end state, aperture diaphragm S and the 3rd lens combination G3 integrally move.

The value of each unit of the 12nd embodiment of the present invention has been shown in following table 24.F in each cell list of embodiment represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and refractive index is and the d line (value that λ=587.6nm) is corresponding.

[table 24] f 38.81～75.35～183.35FNO 3.96～6.19～11.00 ω 29.28～15.48～6.61 (°) face numbering radius-of-curvature face interval refractive index Abbe number

1 47.8034 3.516 1.48749 70.45

2 -54.9592 1.381 1.84666 23.83

3 -103.2755 (D3) 1.0

4 -27.1841 1.005 1.77250 49.61

5 25.8384 0.754 1.0

6 ^* 23.0512 3.830 1.68893 31.16

7 -12.4666 1.005 1.80420 46.51

8 102.5292 (D8) 1.0

9 0.0000 1.256 1.0

10 33.6151 3.140 1.48749 70.45

11 -13.8736 1.005 1.84666 23.83

12 -25.1751 1.130 1.0

13 76.4471 2.637 1.51450 63.05

14 ^*?-26.0362 (D14) 1.0

15 ^*?230.4906 3.077 1.68893 31.16

16 -64.5403 7.284 1.0

17 -15.7104 1.256 1.77250 49.61

18 344.0289 (Bf) 1.0 the 6th, the tenth four sides, the 15 face are aspheric surfaces, and its shape is expressed from the next.

[the 6th face] 1/R=+1/23.0512 κ=1.8286

C4?＝+1.21080×10 ^-6

C6?＝+3.38130×10 ^-7

C8?＝-8.34260×10 ^-9

C10＝+8.44440×10 ^-11

[the 14th face] 1/R=-1/26.0362 κ=1.3174

C4?＝+2.31200×10 ^-5

C6?＝+2.94030×10 ^-7

C8?＝-7.48990×10 ^-9

C10＝+7.13870×10 ^-11

[the 15th face] 1/R=+1/230.4906 κ=4.2292

C4?＝+1.55880×10 ^-5

C6?＝+1.19210×10 ^-8

C8?＝+1.69680×10 ^-11

C10=+9.96150 * 10 ^-13(variable interval)

f 38.8051 75.3501 183.3537

D3 3.0734 14.7292 29.5415

D8 4.8400 3.1203 1.2558

D14 23.4140 13.4834 2.9108

Bf 7.9206 28.6020 78.4385 (the overhang δ G2 of second lens combination during focusing)

f 38.8051 75.3501 183.3537

D0 1103.8874 2144.7388 5149.0620

δ G2 1.0081 0.9040 1.2037 wherein, overhang is the overhang of photography magnification for-1/30 times the time, overhang with the direction of object side for just.(conditional respective value)

β2T＝-0.7061

β2W＝-0.3780

β4T＝1.1743

β4W＝3.4651

(13)(Ra-Rb)/(Ra+Rb)＝0.057

(14)(Δ2/f1)/(ft/fw)＝0.066

(15)(β2T/β2W)/Z＝0.395

(16)|R4|/D＝2.378

(17)(β4T/β4W)/Z＝0.625

Figure 104 to Figure 109 is each aberration diagram of the 12nd embodiment of the present invention, each aberration diagram when Figure 104 to Figure 106 represents the infinity focus state, each aberration diagram when Figure 107 to Figure 109 represents focus state closely (the photography magnification is-1/30 times), each aberration diagram when Figure 104 and Figure 107, Figure 105 and Figure 108, Figure 106 and Figure 109 represent wide-angle side state, middle focal length state, telescope end state respectively.

In each aberration diagram shown in Figure 104 to Figure 109, the solid line in the spherical aberration diagram is represented spherical aberration, and dotted line is represented sine condition, and Y represents image height, and the solid line among the astigmatism figure is represented radially image planes, and dotted line is represented the meridian image planes.Intelligent image difference figure represents that image height y=0,5.4,10.8,15.1,21.6 o'clock intelligent image are poor, and A represents field angle, and H represents object height.

By each aberration diagram as can be known, can compensate each aberration well in the present embodiment, have excellent imaging performance.

(the 13 embodiment)

Figure 110 is the lens arrangement figure of the 13rd embodiment of the present invention, begins to be followed successively by from object one side: the first lens combination G1, by convex surface is constituted towards the positive lens part of object side and the compound lens L1 of negative lens part; The second lens combination G2 is made of the compound lens L22 of biconcave lens L21 and biconvex lens and biconcave lens; The 3rd lens combination G3 makes concave surface constitute towards the combination positive lens L31 and the biconvex lens 32 of the faying face of object side by having; The 4th lens combination G4 is by making convex surface towards as the positive lens L41 of side with concave surface is constituted towards the negative lens L42 of object side.Aperture diaphragm S is configured between the second lens combination G2 and the 3rd lens combination G3, and when lens position state during from the wide-angle side state variation to the telescope end state, aperture diaphragm S and the 3rd lens combination G3 integrally move.

The value of each unit of the 13rd embodiment of the present invention has been shown in following table 25.F in each cell list of embodiment represents focal length, and FNO represents the F number, and ω represents angle of half field-of view, and refractive index is and the d line (value that λ=587.6nm) is corresponding.

[table 25] f 39.00～75.73～184.28FNO 4.92～7.18～11.00 ω 29.15～15.41～6.56 (°) face numbering radius-of-curvature face interval refractive index Abbe number

1 46.5486 3.534 1.48749 70.44

2 -56.2039 1.388 1.84666 23.83

3 -113.0233 (D3)

4 -34.7466 1.010 1.77250 39.62

5 23.2063 0.757

6 ^* 20.3546 2.903 1.68893 31.16

7 -12.7681 1.010 1.80420 46.50

8 61.2808 1.262

9 0.0000 (D9)

10 31.5989 3.660 1.48749 70.44

11 -12.7687 1.010 1.84666 23.83

12 -22.1550 1.136

13 82.6156 2.903 1.51450 64.20

14 ^*?-33.9054 (D14)

15 560.1584 3.282 1.63980 34.57

16 -33.7707 3.534

17 -45.7553 1.262 1.65160 58.14

18 126.2140 5.806

19 -15.2833 1.262 1.77250 49.62

20-83.1096 (Bf) the 6th, the tenth four sides are aspheric surfaces, and its shape is expressed from the next.

[the 6th face] 1/R=+1/20.3546 κ=1.9439

C4?＝-8.81579×10 ^-6

C6?＝+1.87980×10 ^-7

C8?＝-2.57466×10 ^-9

C10＝+8.33794×10 ^-12

[the 14th face] 1/R=+1/560.1584 κ=3.5113

C4?＝+1.98356×10 ^-5

C6?＝+1.04686×10 ^-7

C8?＝7.19074×10 ^-10

C10=+3.67793 * 10 ^-12(variable interval)

f 39.0006 75.7295 184.2761

D3 3.5430 11.8742 30.1066

D8 7.7722 4.3463 1.2621

D14 19.4464 13.2843 4.0250

Bf 7.9520 26.1768 65.2018 (the overhang δ G2 of second lens combination during focusing)

f 39.0006 75.7295 184.2761

D0 1104.4679 2167.6495 5137.9897

δ G2 1.1368 0.8598 1.4089 wherein, overhang is the overhang of photography magnification for-1/30 times the time, overhang with the direction of object side for just.(conditional respective value)

β2T＝-0.5669

β2W＝-0.3912

β4T＝1.2202

β4W＝3.2321

(13)(Ra-Rb)/(Ra+Rb)＝0.066

(14)(Δ2/f1)/(ft/fw)＝0.065

(15)(β2T/β2W)/Z＝0.394

(16)|R4|/D＝5.005

(17)(β4T/β4W)/Z＝0.561

Figure 111 to Figure 116 is each aberration diagram of the 13rd embodiment of the present invention, each aberration diagram when Figure 111 to Figure 113 represents the infinity focus state, each aberration diagram when Figure 114 to Figure 116 represents focus state closely (the photography magnification is-1/30 times), each aberration diagram when Figure 111 and Figure 114, Figure 112 and Figure 115, Figure 113 and Figure 116 represent wide-angle side state, middle focal length state, telescope end state respectively.

In each aberration diagram shown in Figure 111 to Figure 116, the solid line in the spherical aberration diagram is represented spherical aberration, and dotted line is represented sine condition, and Y represents image height, and the solid line among the astigmatism figure is represented radially image planes, and dotted line is represented the meridian image planes.Intelligent image difference figure represents that image height y=0,5.4,10.8,15.1,21.6 o'clock intelligent image are poor, and A represents field angle, and H represents object height.

By each aberration diagram as can be known, can compensate each aberration well in the present embodiment, have excellent imaging performance.

If adopt above each numerical value embodiment, can realize that then small-sized, high-performance and zoom ratio are the lens of variable focal length of the high zoom about 5 times.Particularly, can reach heavy caliberization, hypermutation coking and miniaturization by a plurality of aspheric surfaces are imported in the lens combination that constitutes lens of variable focal length.

Claims (28)

1. variable power optical system, it is from object one side, dispose first lens combination, second lens combination with negative power, the 3rd lens combination with positive light coke with positive light coke, the 4th lens combination with negative power successively, this variable power optical system is characterised in that:

When lens position state during from the wide-angle side state variation to the telescope end state, following moving, the interval that is above-mentioned first lens combination and above-mentioned second lens combination increases, the interval of above-mentioned second lens combination and above-mentioned the 3rd lens combination reduces, the interval of above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination reduces, aperture diaphragm and above-mentioned second lens combination or above-mentioned the 3rd lens combination are adjacent to configuration, the focal length of establishing above-mentioned first lens combination simultaneously is that the focal length of f1, above-mentioned second lens combination is the focal length of f2, above-mentioned the 3rd lens combination when being f3, satisfies following conditional

0.15＜f3/f1＜0.3

2. variable power optical system according to claim 1 is characterized in that:

Be located at above-mentioned second lens combination under the wide-angle side state and above-mentioned the 3rd lens combination be spaced apart D2W, above-mentioned second lens combination under the telescope end state and above-mentioned the 3rd lens combination be spaced apart D2T, be fw at the focal length of the above-mentioned variable power optical system under the wide-angle side state, when the focal length of above-mentioned variable power optical system under the telescope end state is ft, formula meets the following conditions

0.03＜(D2W-D2T)/(fw·ft) ^1/2＜0.15

0.2＜(D1T-D1W)/f1＜0.4

3. variable power optical system according to claim 2 is characterized in that:

Above-mentioned second lens combination constitutes as side disposed adjacent, positive part group with positive light coke by the negative part group with negative power with it.

4. variable power optical system according to claim 3 is characterized in that:

Above-mentioned the 3rd lens combination has the compound lens of positive light coke and the lens of positive light coke.

5. variable power optical system according to claim 2 is characterized in that:

If the focal length of the 4th lens combination is f4, the 3rd lens combination under the wide-angle side state and the 4th lens combination be spaced apart D3W, the 3rd lens combination under the telescope end state and the 4th lens combination be spaced apart D3T the time, formula meets the following conditions

0.3＜|f4|/f1＜0.4

1＜(D1T-D1W)/(D3W-D3T)＜2

6. variable power optical system according to claim 5 is characterized in that:

By along the optical axis direction drive arrangements than at least one lens combination in the lens combination of the more close picture side of above-mentioned first lens combination, focus.

7. variable power optical system according to claim 6 is characterized in that:

When if the focal length of above-mentioned second lens combination is f2, formula meets the following conditions

0.35＜(f3+|f2|)/(fw′·ft) ^1/2＜0.7

8. variable power optical system according to claim 2 is characterized in that:

If the focal length of the 4th lens combination is f4, the 3rd lens combination under the wide-angle side state and the 4th lens combination be spaced apart D3W, the 3rd lens combination under the telescope end state and the 4th lens combination be spaced apart D3T the time, formula meets the following conditions.

0.3＜|f4|/f1＜0.4

1＜(D1T-D1W)/(D3W-D3T)＜2

9. variable power optical system according to claim 1 is characterized in that:

When if the focal length of above-mentioned second lens combination is f2, formula meets the following conditions

0.9＜|f2|/f3＜1.15

10. variable power optical system, it is from object one side, dispose first lens combination, second lens combination with negative power, the 3rd lens combination with positive light coke with positive light coke, the 4th lens combination with negative power successively, this variable power optical system is characterised in that:

When lens position state during from the wide-angle side state variation to the telescope end state, following moving, the interval that is above-mentioned first lens combination and above-mentioned second lens combination increases, the interval of above-mentioned second lens combination and above-mentioned the 3rd lens combination reduces, the interval of above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination reduces, aperture diaphragm and above-mentioned second lens combination or above-mentioned the 3rd lens combination are adjacent to configuration, simultaneously, if the focal length of above-mentioned second lens combination is the focal length of f2, above-mentioned the 3rd lens combination when being f3, satisfy following conditional

0.9＜|f2|/f3＜1.15

11. variable power optical system according to claim 10 is characterized in that:

Be located at above-mentioned second lens combination under the wide-angle side state and above-mentioned the 3rd lens combination be spaced apart D2W, above-mentioned second lens combination under the telescope end state and above-mentioned the 3rd lens combination be spaced apart D2T, be fw at the focal length of the above-mentioned variable power optical system under the wide-angle side state, the focal length of above-mentioned variable power optical system under the telescope end state is the focal length of ft, above-mentioned first lens combination when being f1, formula meets the following conditions

0.03＜(D2W-D2T)/(fw·ft) ^1/2＜0.15

0.2＜(D1T-D1W)/f1＜0.4

12. variable power optical system according to claim 11 is characterized in that:

Aperture diaphragm lens face farthest in above-mentioned the 3rd lens combination is an aspheric surface.

13. variable power optical system according to claim 12 is characterized in that:

If the focal length of the 4th lens combination be f4, the 3rd lens combination under the wide-angle side state and the 4th lens combination be spaced apart D3W, the 3rd lens combination under the telescope end state and the 4th lens combination be spaced apart D3T the time, formula meets the following conditions

0.3＜|f4|/f1＜0.4

1＜(D1T-D1W)/(D3W-D3T)＜2

14. variable power optical system according to claim 13 is characterized in that:

By along the optical axis direction drive arrangements than at least one lens combination in the lens combination of the more close picture side of above-mentioned first lens combination, focus.

15. variable power optical system according to claim 14 is characterized in that:

When if the focal length of above-mentioned second lens combination is f2, formula meets the following conditions

0.35＜(f3+|f2|)/(fw·ft) ^1/2＜0.7

16. variable power optical system according to claim 11 is characterized in that:

If the focal length of the 4th lens combination be f4, the 3rd lens combination under the wide-angle side state and the 4th lens combination be spaced apart D3W, the 3rd lens combination under the telescope end state and the 4th lens combination be spaced apart D3T the time, formula meets the following conditions

0.3＜|f4|/f1＜0.4

1＜(D1T-D1W)/(D3W-D3T)＜2

17. variable power optical system according to claim 11 is characterized in that:

Formula meets the following conditions

0.15＜f3/f1＜0.3

18. the moving possible variable power optical system of image drift is characterized in that:

From object one side, the 4th lens combination G4 that have the first lens combination G1 with positive light coke, the second lens combination G2 successively, has the 3rd lens combination G3 of positive light coke and have negative power with negative power,

When lens position state during from the wide-angle side state variation to the telescope end state, at least above-mentioned first lens combination G1 and above-mentioned the 4th lens combination G4 are to object one side shifting, so that the interval of above-mentioned first lens combination G1 and the above-mentioned second lens combination G2 is increased, the interval of above-mentioned second lens combination G2 and above-mentioned the 3rd lens combination G3 reduces, the interval of above-mentioned the 3rd lens combination G3 and above-mentioned the 4th lens combination G4 reduces

Above-mentioned the 3rd lens combination G3 has two parts lens combination at least, with this at least a part of lens combination in two parts lens combination be made as mobile lens group Gs, move along the direction that is approximately perpendicular to optical axis by making it, it is moving to carry out image drift,

Aperture diaphragm is located between above-mentioned second lens combination G2 and above-mentioned the 3rd lens combination G3,

When the most close focal length that is made as D, above-mentioned mobile lens group Gs as the face and the distance along optical axis between the above-mentioned aperture diaphragm of a side of above-mentioned mobile lens group Gs is fs, meet the following conditions

D/fs＜0.2

19. possible variable power optical system is moved in image drift according to claim 18, it is characterized in that:

Above-mentioned the 3rd lens combination G3 is made of first positive part lens combination G31 with positive light coke and the second positive part lens combination G32 with positive light coke successively from object one side, and the above-mentioned first positive part lens combination G31 constitutes above-mentioned mobile lens group Gs,

If the focal length of above-mentioned the 3rd lens combination G3 is f3, when the focal length of above-mentioned mobile lens group Gs is fs, meet the following conditions

0.35＜f3/fs＜0.7

20. possible variable power optical system is moved in image drift according to claim 19, it is characterized in that:

If above-mentioned mobile lens group Gs is β 3w at the lateral magnification under the wide-angle side state, be configured in than the more close lens combination as side of above-mentioned mobile lens group Gs is that β sw, above-mentioned mobile lens group Gs are β 3t at the lateral magnification under the telescope end state, are configured in when being β st than the more close lateral magnification of lens combination under the telescope end state as side of above-mentioned mobile lens group Gs at the lateral magnification under the wide-angle side state, meet the following conditions

0.4＜{(1-β3t)βst}/{(1-β3w)βsw}/Z＜0.9

21. possible variable power optical system is moved in image drift according to claim 19, it is characterized in that:

By moving the above-mentioned second lens combination G2 along optical axis, the change of the image planes position that the variation of compensation and object space is accompanied.

22. possible variable power optical system is moved in image drift according to claim 18, it is characterized in that:

By moving the above-mentioned second lens combination G2 along optical axis, the change of the image planes position that the variation of compensation and object space is accompanied.

23. the moving possible variable power optical system of image drift is characterized in that:

From object one side, configuration has the first lens combination G1 of positive light coke, the second lens combination G2 with negative power and a lens combination GA with positive light coke at least successively, and the last lens combination GE of negative power is configured in side of close picture,

When lens position state during from the wide-angle side state variation to the telescope end state, make the interval variation between above-mentioned first lens combination G1 and the above-mentioned second lens combination G2, and to object one side shifting, so that carry out converging action forcibly by above-mentioned first lens combination G1 and above-mentioned second lens combination G2 generation, and above-mentioned last lens combination GE is to object one side shifting

The above-mentioned second lens combination G2 is from object one side, constitutes by negative part lens combination G2a with negative power and positive part lens combination G2b with positive light coke successively,

Said lens group GA has a plurality of part lens combination, will with the part lens combination of aperture diaphragm disposed adjacent in these a plurality of part lens combination as mobile lens group Gs, move along the direction that is approximately perpendicular to optical axis by making it, it is moving to carry out image drift,

The focal length of above-mentioned negative part lens combination G2a is made as f2a, the focal length of above-mentioned positive part lens combination G2b is made as f2b, will be made as fvt at the synthetic focal length of above-mentioned first lens combination G1 under the telescope end state and the above-mentioned second lens combination G2, will meets the following conditions when all focal lengths of the optical system under the telescope end state are made as ft

0.1＜|f2a|/f2b＜0.4

0.2＜|fvt|/ft＜0.4

24. the variable power optical system that can closely focus is characterized in that:

From object one side, the first lens combination G1, the second lens combination G2 of negative power, the 3rd lens combination G3 of positive light coke and the 4th lens combination G4 of negative power by positive light coke constitutes successively,

The above-mentioned second lens combination G2 has part lens combination GA with negative power and adjacent and separate the part lens combination GB of configuration with the airspace as side with above-mentioned part lens combination GA at least,

When lens position state during from the wide-angle side state variation to the telescope end state, all the said lens group is to above-mentioned object one side shifting, and the airspace between above-mentioned first lens combination G1 and the above-mentioned second lens combination G2 increases, airspace between above-mentioned second lens combination G2 and above-mentioned the 3rd lens combination G3 reduces, interval between above-mentioned the 3rd lens combination G3 and above-mentioned the 4th lens combination G4 reduces

When closely focusing, the above-mentioned second lens combination G2 is to above-mentioned object one side shifting,

If the radius-of-curvature of the most close lens face as side of above-mentioned part lens combination GA be Ra, above-mentioned part lens combination GB the radius-of-curvature of the lens face of close object side is Rb the time, meet the following conditions

-0.1＜(Ra-Rb)/(Ra+Rb)＜0.3

25. the variable power optical system that can closely focus according to claim 24 is characterized in that:

Aperture diaphragm is configured between above-mentioned second lens combination G2 and above-mentioned the 3rd lens combination G3, if the above-mentioned second lens combination G2 is R4 and is located at the above-mentioned wide-angle side state lower edge distance of optical axis from aperture diaphragm to said lens face LS when being D from the radius-of-curvature of above-mentioned aperture diaphragm lens face LS farthest, meets the following conditions

1.5＜|R4|/D＜3.5

26. the variable power optical system that can closely focus according to claim 24 is characterized in that:

The airspace that is located at above-mentioned first lens combination G1 under the above-mentioned wide-angle side state and the above-mentioned second lens combination G2 is D1W, be that D1T, Δ 2=D1T-D1W and the focal length of establishing the above-mentioned first lens combination G1 are f1, are fw at the focal length of the full impregnated mirror system under the above-mentioned wide-angle side state, when the focal length of the full impregnated mirror system under above-mentioned telescope end state is ft, meet the following conditions in the airspace of above-mentioned first lens combination G1 under the above-mentioned telescope end state and the above-mentioned second lens combination G2

0.03＜(Δ2/f1)/(ft/fw)＜0.1

27. the variable power optical system that can closely focus according to claim 26 is characterized in that:

If the above-mentioned second lens combination G2 is β 2W, the above-mentioned second lens combination G2 at the lateral magnification under the telescope end state at the lateral magnification under the wide-angle side state is β 2T, be fw at the focal length of the full impregnated mirror system under the above-mentioned wide-angle side state, the focal length of the full impregnated mirror system under above-mentioned telescope end state is the ratio ft/fw of ft, above-mentioned ft and fw when being Z, meet the following conditions

0.25＜(β2T/β2W)/Z＜0.5

28. the variable power optical system that can closely focus according to claim 27 is characterized in that:

Aperture diaphragm is configured between above-mentioned second lens combination G2 and above-mentioned the 3rd lens combination G3, if the above-mentioned second lens combination G2 is R4 and is located at the above-mentioned wide-angle side state lower edge distance of optical axis from aperture diaphragm to said lens face LS when being D from the radius-of-curvature of above-mentioned aperture diaphragm lens face LS farthest, meets the following conditions

1.5＜|R4|/D＜3.5

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