CN1683947A - Zoom optic system and optic device - Google Patents
Zoom optic system and optic device Download PDFInfo
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- CN1683947A CN1683947A CNA2005100673712A CN200510067371A CN1683947A CN 1683947 A CN1683947 A CN 1683947A CN A2005100673712 A CNA2005100673712 A CN A2005100673712A CN 200510067371 A CN200510067371 A CN 200510067371A CN 1683947 A CN1683947 A CN 1683947A
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- 239000011521 glass Substances 0.000 claims abstract description 83
- 230000003287 optical effect Effects 0.000 claims abstract description 68
- 238000000034 method Methods 0.000 claims description 17
- 241000219739 Lens Species 0.000 description 232
- 210000000695 crystalline len Anatomy 0.000 description 232
- 230000004075 alteration Effects 0.000 description 21
- 201000009310 astigmatism Diseases 0.000 description 8
- 239000006059 cover glass Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 210000003128 head Anatomy 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++
Abstract
It has a 1st lens group having a negative refracting power and moving on the optical axis when changing its magnification, a 2nd lens group having a positive refracting power and moving on the optical axis when changing its magnification, and a 3rd lens group having positive refracting power but not moving when changing its magnification all arranged in this order from the object side. The above 1st lens group has glass lenses 101, 103 and a plastic lens 102 positioned adjacent to the above glass lens 101. The above 2nd lens group has a plurality of glass lenses 201, 203, 204 and a plastic lens 202 positioned adjacent to the above glass lens 201.
Description
Technical field
The present invention is relevant be suitable for taking the camera etc. of still frame small-sized and be suitable for the varifocal optical system and the optical device of wide-angle cheaply.
Background technology
Use the zoom lens of the video camera of the common usefulness of solid-state image pickup element, pursue the senior machine quality of high zoom, heavy caliber ratio on the one hand, and one side is pursued again, and price is low, convenient, the popular machine of wide-angle.
In the past, as the lens style that is fit to wide-angle, can enumerate negative group of being used in traditional camera and be placed on top 2 groups of zooms (zoom), if this style use the solid-state image pickup element with camera on, because of being traditional camera usefulness, because the pupil position that reflects away is very short, there are the shortcomings such as peripheral light amount reduction that form on the focus face, and improper.For head it off, the suggestion set up positive lens combination on the rear of the 2nd lens combination proposed.(for example :) with reference to patent documentation 1.
In addition, at the zoom lens of using about 3 times of zoom ratios aspect the wide-angle, by the plastic lenss of using more, compare with the past, so that the zoom lens of seeking low price can be provided is purpose, method below showing in document: promptly this zoom lens constitute the 1st lens combination that moves at optical axis the negative refraction power zoom process according to priority from object side, the 2nd lens combination that moves on optical axis in the positive refracting power zoom process is arranged, positive refracting power the 3rd lens combination of fixing in the zoom process, in 3 set vari-focus lens, aforementioned the 1st lens combination has the glass lens of a slice negative refraction power and the plastic lens more than at least two and two to constitute, and aforementioned the 2nd lens combination has the glass lens of a slice positive refracting power at least and is made of the plastic lens more than two and two at least.(with reference to patent documentation 2).
(patent documentation 1) patent disclosure 3-11653 communique
(patent documentation 2) patent disclosure 9-21950 communique
Summary of the invention
In above-mentioned patent documentation 2 described technology, each group is used the plastic lens more than two and two, though make every effort to reduce cost, its performance of plastic lens is easy to variant, and therefore in the manufacturing instability of improving quality, yield rate is low, is not suitable for producing in enormous quantities.In addition, plastic lens is also very low to the stability that temperature humidity changes, and therefore, each retable material lens is used manyly more, problem points also can get more and more, and plastic lens is used manyly more, the correction of various aberrations is just insufficient more, is easy to become big in the wide-angle side size especially, has any problem in miniaturization.
Varifocal optical system and the optical device that the present invention's purpose is to provide a kind of cheapness and performance is good, stability is high.Another purpose is to provide a kind of a large amount of varifocal optical system and optical devices that produce of making every effort to be fit to.Purpose also is to provide a kind of variation for temperature, humidity, varifocal optical system and optical device that stability is high.
In addition, the present invention's purpose is to provide a kind of varifocal optical system and optical device, and it can fully carry out the correction of various aberrations, and, also can provide small-sized, varifocal optical system and optical device.
The application provides a kind of varifocal optical system, it has from object side and has in order the negative refracting power zoom process in mobile the 1st lens combination of optical axis, the 2nd lens combination that moves on optical axis in the positive refracting power zoom process is arranged, with the 3rd lens combination that positive refracting power is arranged that in the zoom process, does not move, above-mentioned the 1st lens combination has the glass lens of multi-disc and a slice plastic lens of a slice glass lens disposed adjacent in the above-mentioned multi-disc glass lens, above-mentioned the 2nd lens combination have multi-disc glass lens and and above-mentioned multi-disc glass lens in a slice plastic lens of a slice glass lens disposed adjacent.
The application's varifocal optical system be from object side regularly the 1st lens combination have the negative refraction power zoom process at optical axis and move, the 2nd lens combination has in the positive refracting power zoom process mobile on optical axis, have, the 3rd lens combination is fixed as positive refracting power in the zoom process again.,, reduce the number of plastic lens here, seldom only use a slice, replace using glass lens, can improve its refractive index with plastic lens compared with many with plastic lens by in aforementioned the 1st lens combination.In addition, plastic lens by will use more than two and two on a lens combination in the past changes into more uses a slice, replace the 2nd later plastic lens to use glass lens, can reach stablizing in the manufacturing, and, replace in the past two of using and two above plastic lenss by using glass lens more, can stablize near the shape of the face of shutter.Equally, in above-mentioned the 2nd lens combination,, seldom change into and only use a slice, replace using glass lens, can improve its refractive index with plastic lens compared with many in the past with plastic lens by reducing the number of plastic lens.In addition, only use a slice by will in a lens combination, how to change use in the past with the plastic lens more than two and two, replace the 2nd later plastic lens to use glass lens, can reach the stabilization in the manufacturing, also have, replace in the past plastic lenss of using more than two and two by using glass lens more, can stablize near the shape of the face of shutter.
In addition, above-mentioned the 1st lens combination has plastic lens and above-mentioned the 2nd lens combination has plastic lens, and simultaneously, its lens face is all made aspheric surface.
The plastic lens and above-mentioned the 2nd lens combination that have for above-mentioned the 1st lens combination have plastic lens, by use aspheric surface in shape at its lens face, and basic aberration that can correcting spherical aberration etc.
In addition, in above-mentioned the 1st lens combination, a slice disposed adjacent on object side in the plastic lens that above-mentioned the 1st lens combination has and the glass lens of above-mentioned multi-disc, the radius of curvature R of the plane of incidence of the plastic lens that above-mentioned the 1st lens combination has
P1r1, and on above-mentioned object side the radius of curvature R of the outgoing plane of the glass lens of disposed adjacent
G1r2Structure make and have 0.8＜(R
P1r1/ R
G1r2The relation of)＜1.2.
The radius of curvature R of the plane of incidence of the plastic lens that above-mentioned the 1st lens combination has
P1r1, and on above-mentioned object side the radius of curvature R of the outgoing plane of the glass lens of disposed adjacent
G1r2Structure is made has 0.8＜(R
P1r1/ R
G1r2The relation of)＜1.2.R
G1r2The aberration R that is taken place
P1r1Can proofread and correct immediately, it is easy that the aberration correction of total system becomes significantly.
Equally, in above-mentioned the 2nd lens combination, a slice disposed adjacent on object side in plastic lens that above-mentioned the 2nd lens combination has and the above-mentioned multi-disc glass lens, the radius of curvature R of the plane of incidence of the plastic lens that above-mentioned the 2nd lens combination has
P2r1, with in the radius of curvature R of the outgoing plane of the glass lens of above-mentioned object side disposed adjacent
G2r2Structure make and have 0.8＜(R
P2r1/ R
G2r2The relation of)＜1.2.
Above-mentioned the 2nd lens combination has the radius of curvature R of the plane of incidence of plastic lens
P2r1, and on above-mentioned object side the radius of curvature R of the outgoing plane of the glass lens of disposed adjacent
G2r2, structure is made has 0.8＜(R
P2r1/ R
G2r2The relation of)＜1.2.R
G2r2The aberration R that is taken place
P2r1Can proofread and correct immediately, it is easy that the aberration correction of total system becomes significantly.
In addition, in above-mentioned the 1st lens combination, the structure of the plastic lens that above-mentioned the 1st lens combination has make with above-mentioned multi-disc glass lens in a slice disposed adjacent on object side, ability (POWER) Φ of the plastic lens that above-mentioned the 1st lens combination has
P1With ability (POWER) Φ at the glass lens of above-mentioned object side disposed adjacent
G1Constitute and have-3＜(Φ
P1/ Φ
G1The relation of)＜3.
Ability (POWER) Φ of the plastic lens that above-mentioned the 1st lens combination has
P1Ability (POWER) Φ with the glass lens of disposed adjacent on above-mentioned object side
G1, structure is made has-3＜(Φ
P1/ Φ
G1The relation of)＜3 can suppress optical property and change the amount that changes for temperature and/or humidity and in the past relatively, particularly by constitute lower to temperature and/or and humidity change ability (POWER) Φ of responsive plastic lens
P1, can suppress the amount that optical property changes.
In addition, in above-mentioned the 2nd lens combination, the structure of the plastic lens that above-mentioned the 2nd lens combination has make with above-mentioned multi-disc glass lens in a slice disposed adjacent on object side, ability (POWER) Φ of the plastic lens that above-mentioned the 2nd lens combination has
P2With ability (POWER) Φ at the glass lens of above-mentioned object side disposed adjacent
G2Constitute and have-3＜(Φ
P2/ Φ
G2The relation of)＜3.
Equally, ability (POWER) Φ of the plastic lens that has of above-mentioned the 2nd lens combination
P2With ability (POWER) Φ at the glass lens of above-mentioned object side disposed adjacent
G2, structure is made has-3＜(Φ
P2/ Φ
G2The relation of)＜3 can suppress amount and former compare of optical property variation for temperature and/or humidity variation, particularly by ability (POWER) Φ of formation attenuating to the plastic lens of temperature and/or humidity variation sensitivity
P1, can suppress the amount that optical property changes.
In addition, the application's optical device feature has above-mentioned varifocal optical system.Particularly above-mentioned optical device is a camera of taking still frame.
According to the application, in above-mentioned the 1st lens combination, by reducing the sheet number of plastic lens, seldom only use a slice with plastic lens, replace all the other all to use glass lens, compared with plastic lenss of using in the past more because of can improving refractive index, can be so that aberration correction, in addition, because help the correction of aberration, becoming easily on the big wide-angle side in size can miniaturization, and, by will manyly in the past changing use a slice into the plastic lens more than two and two, replace using glass lens, because can the steady quality manufacturing, also can improve yield rate, can stably produce in a large number.And, by will manyly in the past changing use a slice into, replace using glass lens with the plastic lens more than two and two, can stablize near the shape of the face of shutter.Can prevent the error of optical property.And, by the plastic lens use glass lens of replacement, thereby can suppress the amount of optical property variation for temperature and/or humidity variation to the variation sensitivity of temperature and/or humidity.
According to the application, in above-mentioned the 2nd lens combination, by reducing the sheet number of plastic lens, seldom only use a slice with plastic lens, replace all the other all to use glass lens, same with the effect in above-mentioned the 1st lens combination, compared with plastic lenss of using in the past more because of can improving refractive index, can be so that aberration correction, can miniaturization on the size wide-angle side that change is big easily, and, by changing in the past plastic lenss of using more than two and two into use a slice, replace using glass lens, because can make on steady quality ground more, also can improve yield rate, can stably produce in a large number.And, change use a slice into by the plastic lens more than two and two that will use more, replace using glass lens, can stablize near the shape of the face of shutter.Can prevent the error of optical property.And, by replacement temperature and/or humidity are changed responsive plastic lens use glass lens, can restrain the amount of optical property variation for temperature and/or humidity variation.
According to the application, have above-mentioned varifocal optical system by making optical device, can obtain above-mentioned effect.Therefore, can guarantee the stable of optical device performance.And, can have again so that optical device is produced in a large number, improve for the temperature of optical device, the stability that humidity changes.In addition, in optical system,, can make the optical device miniaturization because can improve correction to various aberrations.
Description of drawings
Fig. 1 constitutes the figure of usefulness for the lens of expression example 1.
The figure that Fig. 2 uses for each position of each lens combination of expression zoom.
The figure that Fig. 3 uses for each locational spherical aberration of expression zoom.
Fig. 4 is illustrated in each locational astigmatism of zoom and distorts the figure that aberration is used.
Fig. 5 is illustrated in the figure that the relative exposure of each locational image planes of zoom is used.
(explanation of label)
101,103,201,203,204,301, glass lens 102,202 plastic lenss 401 low pass filters 402 cover glasses
Concrete example
(example 1)
Fig. 1 is the lens pie graph of expression example 1.
In Fig. 1, varifocal optical system has from object side places the 1st lens combination, the 2nd lens combination, the 3rd lens combination, low pass filter 401 and cover glass 402 in order.
The 1st lens combination has a slice plastic lens of a slice disposed adjacent in multi-disc glass lens and the above-mentioned multi-disc glass lens.That is, the 1st lens combination has glass lens 101, plastic lens 102, glass lens 103 according to priority from object side.On optical axis, move in the 1st the lens combination negative refraction power zoom process.
The 2nd lens combination also have the multi-disc glass lens and and above-mentioned multi-disc glass lens in a slice plastic lens of a slice disposed adjacent.Promptly, the 2nd lens combination has glass lens 201, plastic lens 202, glass lens 203, glass lens 204 according to priority from object side.The 2nd lens combination has in the positive refracting power zoom process mobile on optical axis.In the 1st lens combination and the 2nd lens combination, reduce the sheet number of plastic lens, few plastic lens of using, each group used a slice, the use glass lens replaces, by improving refractive index compared with many in the past with plastic lens like this, in addition, in the past in 1 lens combination, use two and two above plastic lenss change use a slice into more, replace the 2nd piece of later plastic lens to use glass lens, by making every effort to the stabilization manufacturing like this, in addition, the plastic lens 202 that plastic lens 102 that above-mentioned the 1st lens combination has and above-mentioned the 2nd lens combination have, lens face is all done the formation aspheric surface.By lens face is made aspheric surface, can correcting spherical aberration etc. basic aberration.The 3rd lens combination has glass lens 301.
The 3rd lens combination has irremovable positive refracting power in the zoom process, and in this example, though the 3rd lens combination is 1 piece of lens, even have multi-disc also passable like that as the 3rd lens combination, low pass filter 401 is optically flat filters of blocking-up high frequency light.Cover glass 402 is cover glasses of the CCD that do not illustrate in imaging surface one side figure.
In the 1st lens combination, the face of glass lens 101 is represented with face number 1,2.The face of plastic lens 102 is represented with face number 3,4.The face of glass lens 103 is represented with face number 5,6.In the 2nd lens combination, the face of glass lens 201 represents that with face number 8,9 face of plastic lens 202 represents that with face number 10,11 face of glass lens 203 represents that with face number 12,13 face of glass lens 204 is represented with face number 14,15.In the 2nd lens combination, the face of glass lens 301 is represented with face number 16,17.In addition, the face of low pass filter 401 represents that with face number 18,19 face of cover glass 402 is represented with face number 20,21.
The lens data of each lens of varifocal optical system in table 1,2, the 3 expression examples 1.Be equivalent to the face number of each above-mentioned lens at table 1 li, " face # ", " R " represents the radius-of-curvature of the lens face of each face number.The thickness of " D " expression from the face of this face number to the face of next face number." interval 1 ", " interval 2 " change because of moving on optical axis in the zoom process." N " expression is for the refractive index of the d line in the space of each face number.But refractive index 1.0000 its statements of air are omitted." V " represents that (still, the Abbe number of air is that 0.0 its statement is omitted for Abbe, Ernst) number for the Abbe of the d line of each face number.In addition, li represent each lens with reference to label at table 2 with above-mentioned.
The coefficient of li having represented relevant aspherical shape at table 3.
Aspheric shape uses this coefficient to show with following formula.
Z＝y
2/Rn(1+SQRT(1-(1+k)y
2/Rn))+A2y
2+A4y
4+A6y
6+A8y
8+A10y
10
Z represents it is the distance that position coordinates, y at optical axis direction represents to leave optical axis in the formula.
Table 1
| Face # | ????R | ????D | ????N | ????V | |
| ??OBJ ??STO ??IMA | ????1 ????2 ????3 ????4 ????5 ????6 ????8 ????9 ????10 ????11 ????12 ????13 ????14 ????15 ????16 ????17 ????18 ????19 ????20 ????21 | ?Infinity ?98.541 ?10.100 ?10.634 ?4.565 ?8.360 ?14.845 ?Infinity ?5.735 ?-48.262 ?-40.107 ?9.105 ?7.996 ?5.177 ?19.261 ?-22.818 ?14.521 ?-33.130 ?Infinity ?Infinity ?Infinity ?Infinity ?Infinity | 1 1.100 2.350 0.100 0.700 0.220 0.750 0.600 1.200 intervals 2 2.000 2.000 0.880 0.300 0.500 1.000, Infinity 1.000 0,250 1.000 2.231 1.700 intervals | ? ?1.7292 ? ?1.5247 ? ?1.8052 ? ? ?1.741 ? ?1.5855 ? ?1.8467 ? ?1.5163 ? ?1.4875 ? ?1.5534 ? ?1.5163 ? ? | ? ?54.7 ? ?56.3 ? ?25.4 ? ? ?52.6 ? ?29.9 ? ?23.8 ? ?64.1 ? ?70.2 ? ?68.8 ? ?64.1 ? ? |
Table 2
| Lens | Focal length | Ability |
| ??101 | ??-15.54 | ??-0.0643 |
| ??102 | ??-16.16 | ??-0.0618 |
| ??103 | ??21.28 | ??0.0469 |
| ??201 | ??7.05 | ??0.141 |
| ??202 | ??-12.6 | ??-0.0788 |
| ??203 | ??-19.76 | ??-0.0506 |
| ??204 | ??20.43 | ??0.0489 |
| ??301 | ??21.0 | ??0.0476 |
Table 3
Asphericity coefficient
| ????k | ??????A2 | ??????A4 | ??????A6 | ??????A8 | ??????A10 | |
| 4 | -0.9558 | ?0.0000E+00 | ?3.3545E-04 | ?2.1361E-06 | ?-1.4477E-08 | ?0.0000E+00 |
| 11 | -1.5246 | ?0.0000E+00 | ?1.4480E-03 | ?1.6332E-05 | ?4.01?23E-06 | ?0.0000E+00 |
In above-mentioned the 1st lens combination, a slice glass lens in plastic lens 102 that above-mentioned the 1st lens combination has and the above-mentioned multi-disc glass lens is glass lens 101 disposed adjacent on object side here.As shown in table 1, the radius of curvature R of the plane of incidence of the plastic lens that above-mentioned the 1st lens combination has (face number 3)
P1r1Radius of curvature R with the outgoing plane (face number 2) of the glass lens of disposed adjacent on above-mentioned object side
G1R2Ratio make (R
P1r1/ R
G1r2)=10.634/10.100=1.05.Described ratio is preferably done following relation.
0.8＜(R
P1r1/R
G1r2)＜1.2
In addition, in above-mentioned the 1st lens combination, the inverse of plastic lens 102 focal lengths is ability (POWER) Φ
P1With the inverse of the focal length of the glass lens 101 of above-mentioned object side disposed adjacent be ability Φ
G1Formation has-3＜(Φ
P1/ Φ
G1The relation of)＜3.
Have described relation because constitute, can restrain optical property and change for temperature and/or humidity.Particularly with ability (POWER) Φ that relatively weakens the plastic lens of temperature and/or humidity variation sensitivity in the past
P1, can restrain the amount that optical property changes more.
In above-mentioned the 2nd lens combination, a slice glass lens in plastic lens 202 that above-mentioned the 2nd lens combination has and the above-mentioned multi-disc glass lens is glass lens 201 disposed adjacent on object side here.As shown in table 1, the radius of curvature R of the plane of incidence of the plastic lens that above-mentioned the 2nd lens combination has (face number 10)
P2r1Radius of curvature R with the outgoing plane (face number 9) of the glass lens of disposed adjacent on above-mentioned object side
G2r2Ratio, make R
P2r1/ R
G2r2)=(-40.107)/(48.262)=0.83.Preferably described than (R
P2r1/ R
G2r2) make and have following relation.
0.8＜(R
P2r1/R
G2r2)＜1.2
In addition, the inverse of plastic lens 202 focal lengths that have with above-mentioned the 2nd lens combination is ability (POWER) Φ
P2Ability Φ reciprocal with glass lens 201 focal lengths of disposed adjacent on above-mentioned object side
G2Formation has-3＜(Φ
P2/ Φ
G2The relation of)＜3.
Have described relation because constitute,, can restrain the amount of optical property variation for temperature and/or humidity variation with above-mentioned the same.Particularly by structure is made and ability (POWER) Φ that relatively weakens the plastic lens of temperature and/or humidity variation sensitivity in the past
P2, can restrain the amount that optical property changes.
The figure that each position of each lens combination when Fig. 2 is the expression zoom is used.
Each position of each lens combination of Fig. 2 (a) expression wide-angle side.At Fig. 2 (b), each position of each lens combination in the time of in the middle of being illustrated in.At Fig. 2 (c), be illustrated in each position of each lens combination of telescope end.
Fig. 3 represents the figure that each position spherical aberration of zoom is used.
The astigmatism of Fig. 3 (a) expression wide-angle side.Astigmatism in the time of in the middle of Fig. 3 (b) expression.The astigmatism of Fig. 3 (c) expression telescope end.
Fig. 4 is illustrated in each locational astigmatism of zoom and distorts the figure that aberration is used.
The astigmatism (left figure) of Fig. 4 (a) expression wide-angle side and distortion aberration (right figure).Astigmatism (left figure) in the time of in the middle of Fig. 4 (b) expression and distortion aberration (right figure), the astigmatism (left figure) of Fig. 4 (c) expression telescope end and distortion aberration (right figure).
Fig. 5 is illustrated in the figure that the relative exposure of image planes of each position of zoom is used.
The relative exposure of Fig. 5 (a) expression wide-angle side.Relative exposure in the time of in the middle of Fig. 5 (b) expression.The relative exposure of Fig. 5 (c) expression telescope end.
Shown in above each figure, the varifocal optical system of this example has sufficient performance in practicality.
Optical device, for example, the camera of shooting still frame etc. can obtain above-mentioned effect by having the varifocal optical system of this example.
Claims (8)
1. a varifocal optical system is characterized in that,
Arranging the negative refraction power zoom process in the 1st lens combination that optical axis moves according to priority, the 3rd lens combination that positive refracting power is arranged that does not move in the 2nd lens combination that optical axis moves and zoom process arranged in the positive refracting power zoom process from object side,
Described the 1st lens combination have the multi-disc glass lens and and described multi-disc glass lens in a slice plastic lens of a slice disposed adjacent, described the 2nd lens combination has a slice plastic lens of a slice disposed adjacent in multi-disc glass lens and the described multi-disc glass lens.
2. varifocal optical system as claimed in claim 1 is characterized in that,
The plastic lens that plastic lens that described the 1st lens combination has and described the 2nd lens combination have, lens face is all made aspheric surface.
3. varifocal optical system as claimed in claim 1 or 2 is characterized in that,
In described the 1st lens combination, described the 1st lens combination has a slice glass lens in plastic lens and the described multi-disc glass lens in the object side disposed adjacent, the radius of curvature R of the plane of incidence of the plastic lens that described the 1st lens combination has
P1r1With radius of curvature R at the outgoing plane of the glass lens of described object side disposed adjacent
G1r2, 0.8＜(R is arranged
P1r1/ R
G1r2The relation of)＜1.2.
4. as each described varifocal optical system in claim 1 or 3, it is characterized in that,
In described the 2nd lens combination, a slice glass lens in plastic lens that described the 2nd lens combination has and the described multi-disc glass lens has the radius of curvature R of the plane of incidence of plastic lens in object side disposed adjacent, described the 2nd lens combination
P2r1With radius of curvature R at the outgoing plane of the glass lens of above-mentioned object side disposed adjacent
G2r2, 0.8＜(R arranged
P2r1/ R
G2r2The relation of)＜1.2.
5. as each the described optical focal distance setting system in the claim 1 to 3, it is characterized in that,
In described the 1st lens combination, plastic lens that described the 1st lens combination has and power (ability) Φ of the plastic lens that disposed adjacent, described the 1st lens combination have on object side of a slice glass lens in the described multi-disc glass lens
P1Power (ability) Φ with the glass lens of disposed adjacent on described object side
G1, have-a 3＜(Φ
P1/ Φ
G1The relation of)＜3.
6. as each the described optical focal distance setting system in the claim 1 to 4, it is characterized in that,
In described the 2nd lens combination, power (ability) Φ of the plastic lens that disposed adjacent, described the 2nd lens combination have on object side of a slice glass lens in plastic lens that described the 2nd lens combination has and the described multi-disc glass lens
P2With power (ability) Φ at the glass lens of described object side disposed adjacent
G2, have-a 3＜(Φ
P2/ Φ
G2The relation of)＜3.
7. an optical device is characterized in that,
Comprise as each the described varifocal optical system in the claim 1 to 6.
8. optical device as claimed in claim 7 is characterized in that,
Described optical device is a camera of taking still frame.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004118026A JP2005300981A (en) | 2004-04-13 | 2004-04-13 | Variable power optical system and optical instrument |
| JP2004118026 | 2004-04-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1683947A true CN1683947A (en) | 2005-10-19 |
| CN100406952C CN100406952C (en) | 2008-07-30 |
Family
ID=35263355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005100673712A Expired - Fee Related CN100406952C (en) | 2004-04-13 | 2005-04-13 | Zoom optic system and optic device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005300981A (en) |
| CN (1) | CN100406952C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101387745B (en) * | 2007-09-13 | 2010-06-16 | 富士能株式会社 | Projecting zoom lens and projection display device |
| CN1982937B (en) * | 2005-12-15 | 2010-08-18 | 三星数码影像株式会社 | Compact zoom lens |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5387139B2 (en) * | 2009-05-25 | 2014-01-15 | 株式会社リコー | Imaging lens, camera device, and portable information terminal device |
| KR101660840B1 (en) * | 2009-09-11 | 2016-09-28 | 삼성전자주식회사 | Compact zoom optics |
| CN114967084B (en) * | 2022-06-23 | 2023-08-22 | 佛山市趣影科技有限公司 | Projection zoom lens and projector |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3465036B2 (en) * | 1995-07-05 | 2003-11-10 | コニカミノルタホールディングス株式会社 | Zoom lens |
| JPH0961712A (en) * | 1995-08-24 | 1997-03-07 | Ricoh Co Ltd | Optical system for reading |
| JPH0968649A (en) * | 1995-09-01 | 1997-03-11 | Ricoh Co Ltd | Optical system for reading |
| TW442666B (en) * | 1998-12-22 | 2001-06-23 | Minolta Co Ltd | Zoom lens system |
-
2004
- 2004-04-13 JP JP2004118026A patent/JP2005300981A/en active Pending
-
2005
- 2005-04-13 CN CN2005100673712A patent/CN100406952C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1982937B (en) * | 2005-12-15 | 2010-08-18 | 三星数码影像株式会社 | Compact zoom lens |
| CN101387745B (en) * | 2007-09-13 | 2010-06-16 | 富士能株式会社 | Projecting zoom lens and projection display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100406952C (en) | 2008-07-30 |
| JP2005300981A (en) | 2005-10-27 |
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