CN102385145A - Zoom optical system and shooting device - Google Patents
Zoom optical system and shooting device Download PDFInfo
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- CN102385145A CN102385145A CN2011102543812A CN201110254381A CN102385145A CN 102385145 A CN102385145 A CN 102385145A CN 2011102543812 A CN2011102543812 A CN 2011102543812A CN 201110254381 A CN201110254381 A CN 201110254381A CN 102385145 A CN102385145 A CN 102385145A
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Abstract
The invention provides a zoom optical system and a shooting device. The zoom optical system realizes small size, low cost, relatively low F value, good chrominance correction and high optical performance. The zoom optical system successively comprises, from the object side, a positive first lens group (G1) which is fixed during the zooming, a second lens group (G2) which is moved along an optical axis so as to perform the zooming, a diaphragm which is fixed during the zooming, a positive third lens group (G3) which is fixed during the zooming, and a positive fourth lens group (G4) which corrects the image plane position and focuses along with the zooming operation. The second lens group (G2) successively comprises, from the object side, a negative lens, a positive meniscus lens with a concave surface being oriented to the object side, a biconcave lens and a positive lens. The zoom optical system is configured in such a manner to satisfy the prescribed conditions related to the focal length of the second lens group (G2), the Abbe number of the positive meniscus lens of the second lens group (G2) and the amount of movement of the second lens group (G2) during the zooming from the wide end to the tele end.
Description
Technical field
The present invention relates to variable-power optical system and camera head; More detailed; Relate to and can be used for video camera and electronic stills camera etc., especially can be suitable for as the employed variable-power optical system of rig camera purposes, and the camera head that possesses this variable-power optical system.
Background technology
At present; As with CCD (Charge Coupled Device) and CMOS imaging apparatuss such as (Complementary Metal Oxide Semiconduotor) as camera heads such as the video camera of recording medium, electronic stills camera, rig cameras in employed optical system, exploitation has CCTV (Closed-circuit Television) to use variable-power optical system.This CCTV is with in the variable-power optical system, and with regard to 4 groups constituted, it is more that lens barrel becomes advantage such as simplification and the easy operating of times mechanism, and proposed (for example, with reference to following patent documentation 1～4) morely.
Patent documentation 1: the spy opens the 2003-98434 communique
Patent documentation 2: the spy opens the 2004-325566 communique
Patent documentation 3: the spy opens the 2006-113387 communique
Patent documentation 4: the spy opens the 2009-180897 communique
Yet; In recent years; Because rig camera market enlarges rapidly; So develop increasingly competitiveization, therefore, seek under the photography conditions of low-light (level), also can use such satisfying high standards such as heavy caliber compares and have high imaging performance and the exploitation of the lens combination of small-sized and low-cost formation strongly.
In addition, recently, the universal promotion of digital still camera and kinematograph; Carry out the Flame Image Process of photographs through personal computer; Image appreciation method according to hobby expansion visibility on monitor becomes generally, follows this, and is more and more stricter to the requirement of image bleeding.In the digital camera field, the device that is built-in with image processing techniques constantly increases, and therefore, is not to constitute through the lens that cause cost to improve to solve bleeding, but the technology that the less image of bleeding through digital processing is made a video recording is dealt with.
Under this background,,, more and more stricter to the requirement of bleeding especially to image using CCTV field as main application to keep watch on.But in the CCTV field, owing to advance the differentiation of CCTV with camera and lens mounting, therefore, the above-mentioned technology that is suitable for the digital camera field is comparatively difficult, and the result produces the scioptics system and self suppresses necessity that bleeding produces.
In the device that known patent documentation 1～3 is put down in writing at present, exist the correction of aberration insufficient, perhaps the excessive unfavorable condition of F value when the use that the CCTV as wide-angle side uses.In addition, the device described in the patent documentation 4, because first lens combination is four formations, the external diameter of first lens combination is bigger, and the amount of movement of second lens combination is bigger, and therefore, miniaturization and cost degradation be difficulty comparatively.
Summary of the invention
The present invention In view of the foregoing sets up, and it is a kind of small-sized and cheap and the F value is less and chromatic aberration correction good and variable-power optical system with higher optical property that its purpose is to provide, and the camera head that possesses this variable-power optical system.
The present invention provides a kind of variable-power optical system; Possess in order from object side: have positive refracting power and when becoming times fixing first lens combination, have negative refraction power and through move second lens combination that becomes doubly along optical axis, when becoming times fixing diaphragm, have positive refracting power and when becoming times fixing the 3rd lens combination, have positive refracting power and follow the correction of the image planes position that becomes times and the 4th lens combination of focusing; It is characterized in that; Second lens combination is for be arranged with negative lens, concave surface four formations towards the positive meniscus lens of object side, biconcave lens, positive lens in order from object side; The focal length of second lens combination is made as fG2; The focal length of the total system of wide-angle side is made as fw; To be made as v2p with respect to the Abbe number of the d line of the positive meniscus lens of second lens combination, in the time of will being made as dz2 from the amount of movement of second lens combination of wide-angle side when telescope end becomes times, satisfy following conditional (1)～(3).
1.0＜|fG2|/fw＜1.4...(1)
20＜v2p＜60...(2)
2.8＜dz2/fw＜3.5...(3)
Preferably; First lens combination of variable-power optical system of the present invention is for be arranged with three formations of negative lens, biconvex lens, positive meniscus lens in order from object side; The focal length of first lens combination is made as fG1; The focal length of the negative lens of first lens combination is made as f1n, in the time of will being made as v1n with respect to the Abbe number of the d line of this negative lens, satisfies following conditional (4), (5).
1.5＜|f1n|/fG1＜2.6...(4)
28＜v1n＜33...(5)
Preferably; The 3rd lens combination of variable-power optical system of the present invention is for be arranged with two formations of biconvex lens, negative lens in order from object side; The biconvex lens of the 3rd lens combination has the aspheric surface of one side at least; The focal length of the 3rd lens combination is made as fG3, when the biconvex lens of the 3rd lens combination and the focal length of negative lens are made as f3p, f3n respectively, satisfies following conditional (6), (7).
4.0＜fG3/fw＜5.5…(6)
0.3＜|f3p/f3n|＜0.6…(7)
Preferably; The 4th lens combination of variable-power optical system of the present invention constitutes or four formations for be arranged with biconvex lens, a slice or two negative lenses, positive lens three in order from object side; The focal length of the said biconvex lens of the 4th lens combination is made as f4pf; The 4th lens combination be made as f4Pr near focal length as the positive lens of side the time, satisfy following conditional (8).
0.3＜f4pf/f4pr＜2.7…(8)
In addition, the symbol of the refracting power of described each lens and face shape are that the situation of non-spherical lens is near axis area at these lens.
In addition, described lens number is the sheet number as the lens of inscape.For example, there is being joint to have under the situation of the different a plurality of signal-lens joint lens of material, calculating through the signal-lens number that constitutes these joint lens.
The present invention provides a kind of camera head, it is characterized in that, possesses the variable-power optical system of the present invention of above-mentioned record.
Variable-power optical system of the present invention; Possess in order from object side: fixing positive first lens combination when becoming times, through move second lens combination that becomes doubly along optical axis Z, fixing diaphragm when becoming times, fixing positive the 3rd lens combination when becoming times, the correction of following the image planes position that becomes times and positive the 4th lens combination of focusing; The lens formation of second lens combination is made as the best; With the formula of satisfying condition (1)～(3), therefore, be small-sized and cheap formation; Simultaneously, can realize less F value, good chromatic aberration correction, and higher optical property.
In addition,, therefore, can constitute small-sized and at an easy rate, can carry out the photography under the low-light (level), can obtain the video of the less height portrait sharpness of bleeding because camera head of the present invention possesses variable-power optical system of the present invention.
Description of drawings
Fig. 1 is the sectional view that the lens of the variable-power optical system of expression an embodiment of the present invention constitute;
Fig. 2 (A)～Fig. 2 (C) is the sectional view that the lens of the variable-power optical system of the expression embodiment of the invention 1 constitute;
Fig. 3 (A)～Fig. 3 (C) is the sectional view that the lens of the variable-power optical system of the expression embodiment of the invention 2 constitute;
Fig. 4 (A)～Fig. 4 (C) is the sectional view that the lens of the variable-power optical system of the expression embodiment of the invention 3 constitute;
Fig. 5 (A)～Fig. 5 (C) is the sectional view that the lens of the variable-power optical system of the expression embodiment of the invention 4 constitute;
Fig. 6 (A)～Fig. 6 (C) is the sectional view that the lens of the variable-power optical system of the expression embodiment of the invention 5 constitute;
Fig. 7 (A)～Fig. 7 (C) is the sectional view that the lens of the variable-power optical system of the expression embodiment of the invention 6 constitute;
Fig. 8 (A)～Fig. 8 (I) is each aberration diagram of the variable-power optical system of the expression embodiment of the invention 1;
Fig. 9 (A)～Fig. 9 (I) is each aberration diagram of the variable-power optical system of the expression embodiment of the invention 2;
Figure 10 (A)～Figure 10 (I) is each aberration diagram of the variable-power optical system of the expression embodiment of the invention 3;
Figure 11 (A)～Figure 11 (I) is each aberration diagram of the variable-power optical system of the expression embodiment of the invention 4;
Figure 12 (A)～Figure 12 (I) is each aberration diagram of the variable-power optical system of the expression embodiment of the invention 5;
Figure 13 (A)～Figure 13 (I) is each aberration diagram of the variable-power optical system of the expression embodiment of the invention 6;
Figure 14 is the summary pie graph of the camera head of expression embodiment of the present invention.
Symbol description
1 variable-power optical system
2 wave filters
3 imaging apparatuss
4 signal processing parts
5 zoom control parts
10 camera heads
G1 first lens combination
G2 second lens combination
G3 the 3rd lens combination
G4 the 4th lens combination
PP optic material
L11～L13, L21～L24, L31, L32, L41～L43 lens
The Sim image planes
The St aperture diaphragm
The Z optical axis
Embodiment
Below, with reference to accompanying drawing embodiment of the present invention is elaborated.Fig. 1 is the routine sectional view of formation of the variable-power optical system of expression an embodiment of the present invention.Formation shown in Figure 1 example with after the lens configuration in wide-angle side of variable-power optical system of the embodiment 1 that states corresponding.In Fig. 1, the left side is an object side, and the right side is the picture side.
This variable-power optical system possesses from object side along optical axis Z in order: have positive refracting power and when becoming times the fixing first lens combination G1, have negative refraction power and through move the second lens combination G2 that becomes doubly along optical axis Z, fixing aperture diaphragm St when becoming times, have positive refracting power and when becoming times fixing the 3rd lens combination G3, have positive refracting power and carry out and become the correction of the image planes position that the change that doubly reaches object distance follows and the 4th lens combination G4 of focusing.In addition, aperture diaphragm St shown in Figure 1 is not certain expression size and shape, also representes the position on the optical axis Z.
When this variable-power optical system is applicable to camera head; Formation according to the photograph pusher side of lens mounting; Preferably between optical system and image planes Sim, dispose protection glass, prism, cutoff filter, and various wave filters such as low-pass filter; Therefore, in Fig. 1, represented the optic material PP of parallel flat shape of they hypothesis is configured in the example between the 4th lens combination G4 and the image planes Sim.
The bleeding of one of problem of the present invention results from the deviation of the coma aberration of each wavelength of visible region (also claiming coma) bigger.This main cause can enumerate out that the variation of following the axle that becomes doubly to go up aberration is big, and become the ratio chromatism, in district doubly in the centre bigger.That is, need suppress in order to reduce bleeding to change by mobile these aberrations that cause of the second lens combination G2 with doing one's utmost.
Common chromatic aberration correction is used the combination of positive negative lens; But under the synthetic focal length of this positive negative lens is positive situation; Usually use the material that Abbe number is big and have anomalous dispersion property at this positive lens, perhaps, on negative lens, use the bigger material of Abbe number in the high chromatic dispersion material.On the contrary, the synthetic focal length of positive negative lens for negative situation under, use the little material of Abbe number at this positive lens usually, use the big material of Abbe number at negative lens.At the synthetic focal length of positive negative lens is under positive situation, the negative situation, all is that the side spectrum of the more little then aberration of difference of Abbe number of positive lens and negative lens that constitutes the positive negative lens of combination becomes more little.
On the other hand, under the situation that aberration is proofreaied and correct, the difference of the Abbe number of the material of the positive negative lens of use is big more, the refracting power of these positive negative lenses all more a little less than.It is to keep spherical aberration, realize that less F value is effective lessly.
Therefore, in order to keep simultaneously spherical aberration and aberration, material chosen outbalance well.Because the equal cost of fee of material processing charges of anomalous dispersion material is higher, therefore, expectation makes external diameter little as far as possible.For example, if the negative refraction power of the second lens combination G2 is strengthened, the amount of movement from the wide-angle side to the telescope end is reduced, then the light height at the first lens combination G1 of the axle outer light beam of wide-angle side reduces, and can reduce lens diameter, therefore, also can suppress cost.
In addition, become to a certain extent in the doubly big variable-power optical system, for the change of the various aberrations of the aberration of multiplying power in the middle of suppressing and spherical aberration (also claiming spherical aberration), control becomes the formation outbalance of the second lens combination G2 doubly lessly.Therefore, the strong and less formation of aberration change when becoming times of the negative refraction power that need seek the second lens combination G2.Variable-power optical system of the present invention is based on above-mentioned viewpoint and designs, and in the second lens combination G2, has special formation.
The second lens combination G2 of the variable-power optical system of embodiment of the present invention adopts and is arranged with negative lens in order from object side is lens L21, make concave surface is that lens L22, biconcave lens are that lens L23, positive lens are four formations of lens L24 towards the positive meniscus lens of object side.
In addition; In this variable-power optical system; Focal length with the second lens G2 is made as fG2, and the focal length of the total system of wide-angle side is made as fw, and the lens L22 of the second lens combination G2 is made as v2p to the Abbe number of d line; In the time of will being made as dz2 at amount of movement, constitute according to the mode that satisfies following conditional (1)～(3) from the second lens combination G2 of wide-angle side when telescope end becomes times.
1.0＜|fG2|/fw＜1.4...(1)
20＜v2p＜60...(2)
2.8＜dz2/fw＜3.5...(3)
Conditional (1) is used to limit the influence to total system of negative refraction power that the second lens combination G2 has.If be lower than the lower limit of conditional (1); Then the refracting power of the second lens combination G2 strengthens; When becoming times, for fixed first lens group G1, the 3rd lens combination G3, the positive refracting power of the first lens combination G1, the 3rd lens combination G3 increases; Follow to become aberration doubly and become excessive, keep well than the highland and just become difficult becoming doubly the imaging performance isotropism in whole zone.If be higher than the upper limit of conditional (1), the amount of movement of the second lens combination G2 when then becoming times from wide-angle side to telescope end is excessive, and the lens total length increases, perhaps become big footpathization and disagreing with miniaturization of the lens of the first lens combination G1.Mode through according to the formula of satisfying condition (1) constitutes; Can not damage compactedness; Follow changes such as becoming spherical aberration doubly, curvature of the image (also claiming the curvature of field), aberration to be suppressed, can spread all over change and doubly distinguish whole zone in the higher and good performance of picture overall maintain isotropism.
Conditional (2) is used to stipulate that the second lens combination G2's is disposed at the preferred range of Abbe number of the lens L22 of deputy positive meniscus shape from object side.In the second lens combination G2, in wide-angle side, the height of off-axis ray is compared with the height of axle glazed thread and is increased; Then opposite at telescope end, the height of the outer chief ray of aspect ratio axle of axle glazed thread is high.In order to suppress change by poor each aberration that produces of these light height; The second lens combination G2 configuration has under the situation of negative lens of stronger negative refraction power near object side, positive lens is disposed and relaxes the stronger diversity that this negative lens has following closely get final product.
But if so that the whole negative refraction power of the second lens combination G2 satisfies the mode of above-mentioned conditional (1) formula constitutes, then can not greatly strengthen the negative refraction power of the second lens combination G2, consequently, the refracting power of the positive lens L22 of the second lens combination G2 can not be too strong.Therefore; Through this positive lens L22 is formed the meniscus shape of concave surface towards object side; Thereby have sufficient convergence to relax the stronger diversity that the negative lens near object side has that is positioned at of the second lens combination G2, simultaneously, can be the not too strong degree of positive refracting power.When adopting this formation, in order to keep aberration well, need limit the material of lens L22 scope to the Abbe number of d line.
If be lower than the lower limit of conditional (2), then the ratio chromatism, in the wide-angle side increases, the distally that is visible, and aberration increases on the axle.If be higher than the upper limit of conditional (2); Then district to the situation of side with the lower limit that is lower than conditional (2) of looking in the distance has the aberration generation towards on the contrary become doubly from the centre; If correcting chromatic aberration and change other lens key element in the second lens combination G2; Then bring the increase of curvature of the image and coma aberration change, can not keep performance well in whole zone.
Conditional (3) is the formula that is associated with the miniaturization of lens combination, with the complementary each other relation of conditional (1).If be lower than the lower limit of conditional (3), then the refracting power of each group of the first lens combination G1, the second lens combination G2, the 3rd lens combination G3 became strong, can not maintain the doubly imaging performance in whole zone of change well.If be higher than the upper limit of conditional (3), though then keep imaging performance well, the big footpathization of lens and diminish compactedness, though with supervision use also obtain as the main application space excessive, therefore, not preferred.
As above; The second lens combination G2 is made as from object side is arranged with negative lens, concave surface four formations in order towards the positive meniscus lens of object side, biconvex lens, positive lens; Through constituting, can provide at an easy rate lens combination is maximized and the F value is less and variable-power optical system with high optical property that each aberration that comprises aberration is proofreaied and correct well according to the mode that satisfies above-mentioned conditional (1)～(3).
The lens L21 of the second lens combination G2 preferably constitutes towards the mode as side according to the little face of the absolute value of radius-of-curvature.According to such formation; Formed angle of the normal with this face in the time of can making from axle outer light beam in the wide-angle side to the face incident of the object side of lens L21 and the formed angle of the normal with this face during from the face ejaculation of the picture side of lens L21 are roughly the same; Thus, can suppress to Min. the generation of off-axis aberration.Lens L21 for example can be made as diverging meniscus lens or the biconcave lens of convex surface towards object side.Lens L24 preferably constitutes towards the mode as side according to the big face of the absolute value of radius-of-curvature.Lens L24 for example can be made as positive meniscus lens or the biconvex lens of convex surface towards object side.Also can lens L23 and lens L24 be engaged, under situation about engaging, help miniaturization and chromatic aberration correction.
Then, other lens combination to this variable-power optical system describes.Much less, second lens combination and other lens combination have incidence relation, in addition, are described in detail as following, and the formation through the optimization first lens combination G1, the 3rd lens combination G3, the 4th lens combination G4 can help the solution of problem of the present invention.
The first lens combination G1 preferably is made as and is arranged with negative lens in order from object side is that lens L11, biconvex lens are that lens L12, positive meniscus lens are three formations of lens L13.
Have under the situation of above-mentioned three formations at the first lens combination G1; The focal length of the first lens combination G1 is made as fG1; The focal length of the lens L11 of the first lens combination G1 is made as f1n, when the Abbe number to the d line of lens L11 is made as v1n, preferably satisfies following conditional (4), (5).
1.5＜|f1n|/fG1＜2.6...(4)
28＜v1n＜33...(5)
Through adopting the preferred formation of the first above-mentioned lens combination G1, can suppress cost, simultaneously, particularly can suppress to become and doubly distinguish to the generation of the aberration of telescope end from the centre.In order to suppress the price of lens combination, suppress the big footpathization of the minimized and lens of formation sheet number with doing one's utmost.The first lens combination G1 is arranged with negative lens, positive biconvex lens, three formations of positive meniscus lens in order from object side, is the simple and the most best formation that balance derived from the performance cost.
Conditional (4) is the relevant condition of the refracting power of the negative lens of the restriction first lens combination G1.If be lower than the lower limit of conditional (4), then particularly the last aberration of the axle of telescope end is proofreaied and correct superfluously, must increase through the Abbe number that will use material and remedy.Like this, from the colour killing condition, the refracting power of the positive lens in the first lens combination G1 of antagonism strengthens, and only is difficult to well spherical aberration proofreaied and correct through two positive lenss, and simultaneously, the allowance of rigging error reduces, the property made reduction, and cost improves.For fear of this situation, can only increase the whole focal length of the first lens combination G1, but under these circumstances; In order to keep the change multiple proportions of total system, must weaken the negative refraction power of the second lens combination G2, and increase the amount of movement of the second lens combination G2; Thus, can not avoid the maximization of total system.
If be higher than the upper limit of conditional (4), then on the contrary, aberration correction is not enough on the axle, though use the little material of Abbe number to remedy, side spectrum worsens, if suppress the aberration of long wavelength side significantly, then the aberration of short wavelength side worsens, and occurs bleeding easily.
Conditional (5) is the relevant condition of Abbe number of material of the negative lens of the first lens combination G1, with the complementary each other relation of conditional (4).If be lower than the lower limit of conditional (5), then also can not strengthen the refracting power of negative lens, but change is distinguished doubly to telescope end and can not be proofreaied and correct side spectrum well from the centre, occurs bleeding easily.If be higher than the upper limit of conditional (5), then owing to colour killing, so the refracting power of negative lens, positive lens became strong, spherical aberration correction is not enough, can not keep imaging performance well.In order to keep imaging performance well, for example the lens number is increased if positive lens is made as three grades, then bring cost to improve.
The lens L11 of first lens combination for example can adopt the diverging meniscus lens of convex surface towards object side.Lens L13 for example can adopt the positive meniscus lens of convex surface towards object side.Also can L11 and lens L12 be engaged, under situation about engaging, help miniaturization and chromatic aberration correction.
The 3rd lens combination G3 preferably is made as and is arranged with biconvex lens in order from object side is that lens L31, negative lens are two formations of L32.At this moment, preferred lens L31 has the aspheric surface of one side at least.
Have under the situation of above-mentioned two formations at the 3rd lens combination G3, the focal length of the 3rd lens combination G3 is made as fG3, when the focal length of the lens L31 of the 3rd lens combination G3 and lens L32 is made as f3p, f3n respectively, preferably satisfy following conditional (6), (7).
4.0＜fG3/fw＜5.5…(6)
0.3＜|f3p/f3n|＜0.6…(7)
In this variable-power optical system; Through the positive refracting power that makes the 3rd lens combination G3 have regulation; Make in wide-angle side to telescope end from the optical system of the first lens combination G1 to the, three lens combination G3 burnt for almost not having, the amount of movement of the 4th lens combination G4 when can appropriateness suppressing to be used for fixing the i.e. change times of the imaging point of the picture side of the 4th lens combination G4 of positive lens groups during focusing.
If the positive lens in the 3rd lens combination G3 is equipped on object side; The rear cut-off distance of total system is not risen to promptly to be accomplished more than required; Residual negative lens through with the 3rd lens combination G3 makes up, and can help a planarization of going up aberration and image planes characteristic of wide-angle side.Particularly; With regard to the 3rd lens combination G3 and since from wide-angle side to change doubly distinguish, the light height of light beam is the highest on the axle; Near aperture diaphragm St is equipped on; Therefore, be to make influence reduce and be easy to spherical aberration and axle to be gone up the lens combination that aberration is proofreaied and correct, the important formation that preferably constitutes the imaging performance that solves total system of above-mentioned the 3rd lens combination G3 to the image planes characteristic.
At this moment, if with the 3rd lens combination G3 be made as non-spherical lens near the positive lens of object side, then can suppress to follow the change that becomes spherical aberration doubly well.In addition; In order to make from the optical system of the first lens combination G1 to the, three lens combination G3 is almost not have Jiao's; Near the mode that need be positioned at the front side focus of the 3rd lens combination G3 the synthetic picture point of the first lens combination G1 and the second lens combination G2 constitutes, and the focal length of the 3rd lens combination G3 need be considered this aspect.
Conditional (6) is the condition of the above-mentioned situation of reflection.When wide-angle side and telescope end make the synthetic picture point of the first lens combination G1 and the second lens combination G2 roughly consistent; For the change multiple proportions that obtains to stipulate; The first lens combination G1, the second lens combination G2 positive and negative refracting power separately are strong more; Synthetic picture point is more near the 3rd lens combination G3, and therefore, the focal length of the 3rd lens combination G3 also reduces.
Dispose the formation of positive lens, negative lens in order from the object side of the 3rd above-mentioned lens combination G3, have the effect that principal point position, front side is pressed to the direction of the second lens combination G2, and have the shorter effect of focal length that makes the 3rd lens combination G3.Thus; Owing to can suppress the amount of movement of the synthetic picture point of the first lens combination G1～the 3rd lens combination G3 that whole change doubly distinguishes lessly; So can be so that be used to make the amount of movement of the optical axis direction of the 4th certain lens combination G4 of the synthetic picture point of the first lens combination G1～the 4th lens combination G4 to reduce, help the whole miniaturization of lens combination, and the pathization of the lens of the 4th lens combination G4 widely.
If be lower than the lower limit of conditional (6), then each refracting power of the first lens combination G1～the 3rd lens combination G3 strengthens, and follows the aberration change that becomes doubly to increase, thereby the imaging performance homogeneity of total system is good and keep the difficulty that just becomes well.If be higher than the upper limit of conditional (6), then each refracting power of the first lens combination G1～the 3rd lens combination G3 weakens, and lens combination maximizes, and can not realize densification.
In the conditional (7), the ratio of the focal length of the positive lens of the 3rd lens combination G3 and the focal length of negative lens is stipulated through absolute value.If be lower than the lower limit of conditional (7), then positive refracting power became strong, must reduce the Abbe number of negative lens for the axle of proofreading and correct the wide-angle side goes up aberration, and the side spectrum of aberration increases on the axle of wide-angle side, has encouraged bleeding.If be higher than the upper limit of conditional (7), then the focal length of the 3rd lens combination G3 increases, and diminishes the compactedness of total system, Po Zi is cut down and become and approach 0 value and can not obtain good image planes characteristic.
Adopt under the situation of above-mentioned two formations at the 3rd lens G3, preferably on aberration correction two all be made as simple lens.The lens L32 of the 3rd lens combination G3 for example can adopt diverging meniscus lens.Through lens L31 is made as biconvex lens, L32 is made as diverging meniscus lens with lens, the formula that satisfies condition easily (7).
The 4th lens combination G4 is preferably and is arranged with biconvex lens in order from object side is that lens L41, negative lens are that lens L42, positive lens are three formations of lens L43.Perhaps, the 4th lens combination G4 is preferably four formations that are arranged with biconvex lens, two negative lenses, positive lens from object side in order.
Have at the 4th lens combination G4 under the situation of above-mentioned three formations or four formations; The 4th lens combination G4 is made as f4pf near the focal length of the biconvex lens of object side; With the 4th lens combination G4 be made as f4pr near focal length as the positive lens of side the time, preferably satisfy following conditional (8).
0.3＜f4pf/f4pr＜2.7…(8)
Be arranged with three formations or four formations positive and negative, negative, positive lens positive and negative, positive lens in order through the 4th lens combination G4 being made as from object side; It both had been simple formation; Realize less F value again, and also can keep imaging performance well.
Conditional (8) regulation the 4th lens combination G4 near the positive lens of object side with near the scope of the best of the ratio of the focal length of the positive lens that looks like side.Doubly distinguish in whole change, and compare near positive lens as side, the strongest near the positive lens of object side to the effect of the effect comparison off-axis aberration of spherical aberration; On the contrary, and compare near the positive lens of object side, the strongest near the positive lens of picture side to the effect of the effect comparison spherical aberration of off-axis aberration.In order to keep imaging performance well, obtain two sides' balance outbalance in the whole zone of picture.
If be lower than the lower limit of conditional (8); Then the 4th lens combination G4's became strong near the refracting power of the positive lens of object side; It is not enough doubly to distinguish the scope spherical aberration correction in whole change, even the lens shape that changes in the 4th lens combination G4 can not obtain the good optical performance.If be higher than the upper limit of conditional (8), then became strong near refracting power as the positive lens of side, produce image planes and tilt.In order doubly to distinguish the imaging performance of keeping full frame well, need constitute according to the mode that satisfies this conditional (8) in whole change.
The 4th lens combination G4 can be made as simple lens with the full impregnated mirror, and this situation helps the correction and the image planes characteristic of spherical aberration.Adopt at the 4th lens combination G4 under the situation of above-mentioned preferred three formations, the lens L42 of preferred the 4th lens combination G4 constitutes towards the mode as side according to the less face of radius-of-curvature absolute value.Lens L42 according to the less face of the absolute value of radius-of-curvature under the situation that the mode as side constitutes; To be that lens L41 receives and is that lens L42 is when penetrating through follow-up negative lens by positive lens near there not being burnt light beam; The incident ray height of a last light beam is increased with the difference that penetrates the light height; The rear cut-off distance of total system is suitably reduced, and Po Zi is cut down and become and approach 0 value, thereby suppress the curvature of the image of total system and can help the planarization of picture.Lens L42 for example can be made as the diverging meniscus lens of convex surface towards object side.Lens L43 can become biconvex lens for example or the plane plano-convex lens towards the picture side.
Adopt under the situation of above-mentioned preferred four formations at the 4th lens combination G4; Two negative lenses of the 4th lens combination G4 can be made as convex surface towards the diverging meniscus lens of picture side, with the diverging meniscus lens of convex surface towards object side from object side in order, for example can be made as biconvex lens near the positive lens as side or with the positive meniscus lens of convex surface towards object side.
This variable-power optical system more preferably replaces above-mentioned conditional (1)～(8) respectively and satisfies following conditional (1-1)～(8-1) respectively.Through the formula that satisfies condition respectively (1-1)～(8-1), can further improve effect through the formula that satisfies condition respectively (1)～(8) obtain.In addition,, there is no need to satisfy simultaneously full terms formula (1-1)～(8-1), as long as any one of the formula of satisfying condition (1-1)～(8-1) or combination arbitrarily as preferred mode.
1.1＜|fG2|/fw＜1.3…(1-1)
21＜v2p＜58.5…(2-1)
3.0＜dz2/fw＜3.4…(3-1)
1.6＜|f1n|/fG1＜2.4…(4-1)
29＜v1n＜32…(5-1)
4.2＜fG3/fw＜5.2…(6-1)
0.35＜|f3p/f3n|＜0.55…(7-1)
0.50＜f4pf/f4pr＜2.55…(8-1)
Under the situation that this variable-power optical system uses in harsh environment, the preferred multilayer film coating of implementing protection usefulness.And then, except that implementing protection with the coating, the anti-reflection coating of the afterimage light reduction in the time of can also implementing to be used to use etc.
In example as shown in Figure 1; Represented between lens combination and image planes Sim, to dispose the example of optic material PP; But also can replace the configuration low-pass filter and these various wave filters of configuration by the various wave filters in certain wavelengths territory etc. and between each lens; Perhaps, on the lens face of any one lens, implement to have the coating of same function with various wave filters.
Then, the numerical value embodiment to variable-power optical system of the present invention describes.Fig. 2 (A), Fig. 2 (B), Fig. 2 (C) represent respectively embodiment 1 variable-power optical system in wide-angle side, at the middle focal length state, in the lens configuration of telescope end.In Fig. 2 (A)～Fig. 2 (C), also represent optic material PP simultaneously, the left side is an object side, and the right side is the picture side, and illustrated aperture diaphragm St is not certain expression size or shape, representes the position on the optical axis z yet.
Equally; Fig. 3 (A), Fig. 3 (B), Fig. 3 (C) represent respectively embodiment 2 variable-power optical system in wide-angle side, at the middle focal length state, in the lens configuration of telescope end; Fig. 4 (A), Fig. 4 (B), Fig. 4 (C) represent respectively embodiment 3 variable-power optical system in wide-angle side, at the middle focal length state, in the lens configuration of telescope end; Fig. 5 (A), Fig. 5 (B), Fig. 5 (C) represent respectively embodiment 4 variable-power optical system in wide-angle side, at the middle focal length state, in the lens configuration of telescope end; Fig. 6 (A), Fig. 6 (B), Fig. 6 (C) represent respectively embodiment 5 variable-power optical system in wide-angle side, at the middle focal length state, in the lens configuration of telescope end, Fig. 7 (A), Fig. 7 (B), Fig. 7 (C) represent respectively embodiment 6 variable-power optical system in wide-angle side, at the middle focal length state, in the lens configuration of telescope end.
The basic lens data of the variable-power optical system of table 1 expression embodiment 1, the data that table 2 expression is doubly relevant with change, table 3 expression aspherical surface data.Equally, table 4～table 18 is represented the basic lens data of the variable-power optical system of embodiment 2～6, the data doubly relevant with change, aspherical surface data respectively.Below, about the meaning of mark in the table, get embodiment 1 and describe as an example, but also substantially the same to embodiment 2～6.
In the basic lens data of table 1; In the Si hurdle expression will be near the face of the inscape of object side as first numbering and according to towards the i that increases successively as side (i=1,2,3 ...) the face numbering; The radius-of-curvature of expression i face in the Ri hurdle, the face on optical axis z of 10 of expression i face and i at interval in the Di hurdle.In addition; In the Ndi hurdle 10 of expression i face and i between the refractive index to d line (wavelength 587.6nm) of medium, in the vdj hurdle expression with near the optical parameter of object side as first numbering and along with j that increases towards picture side order (j=1,2,3 ...) Abbe number to the d line of optical parameter.
In addition, in the symbol of radius-of-curvature, be that protruding situation just is made as at object side with the face shape, will be in that as side to be that protruding situation is made as negative.Also expression comprises aperture diaphragm St, optic material PP in basic lens data.In the face numbered bin of the face that is equivalent to aperture diaphragm St, record face numbering and (aperture diaphragm) such statement, in the face numbered bin of the face that is equivalent to image planes, record face numbering and (image planes) such statement.
In the basic lens data of table 1, record variable 1, variable 2, variable 3, variable 4 respectively in the jube between the face that when becoming times, changes at interval.Variable 1 is the interval of the first lens combination G1 and the 21 lens combination G2; The interval of variable 2 expression second lens combination G2 and aperture diaphragm St; Variable 3 is the interval of the 3rd lens combination G3 and the 4th lens combination G4, and variable 4 is the interval of the 4th lens combination G4 and optic material PP.
Table 2 with become doubly relevant data, be illustrated in separately variable 1, variable 2, variable 3, variable 4, focal length of wide-angle side, middle focal length state, telescope end, F value, the value of field angle entirely.In table 2, middle focal length state, focal length, F value, full field angle are labeled as centre, f, FNo., 2 ω respectively.With basic lens data and become in the doubly relevant data, as the unit usage degree of angle, use mm as the unit of length, even but optical system owing to enlarge in proportion or scaledly also can use thereby also can use other suitable unit.
In the basic lens data of table 1, with regard to aspheric surface, the opposite label marks the * mark, representes the numerical value of paraxial radius-of-curvature as aspheric radius-of-curvature.The aspherical surface data of table 3 is represented the asphericity coefficient relevant with these aspheric surfaces." E-n " (n: integer) be meant " * 10 of the numerical value of the aspherical surface data of table 3
-n".Asphericity coefficient serve as reasons each the coefficient κ in the aspheric surface formula of following formula (A) expression, the value of Am (m=4,6,8,10).Wherein, the ∑ in the formula (A) be meant relevant with m (m=4,6,8,10) with.
Zd=Ch
2/ { 10 (1 one κ C
2H
2)
1/2Ten ∑ Amh
m(A)
Zd: the aspheric surface degree of depth length of vertical line of tangent and vertical with optical axis plane, aspheric surface summit (point on the aspheric surface of height h hang down)
H: highly (distance from the optical axis to the lens face)
C: paraxial curvature
κ, Am: asphericity coefficient (m=4,6,8,10)
Table 1
Table 2
The data that embodiment 1 is doubly relevant with change
| Wide-angle side | Middle | | |
| Variable | |||
| 1 | 1.041 | 16.622 | 26.261 |
| Variable 2 | 26.476 | 10.868 | 1.299 |
| |
12.937 | 8.392 | 13.194 |
| |
10.000 | 14.545 | 9.743 |
| f | 8.159 | 25.293 | 77.756 |
| FNo. | 1.70 | 1.93 | 2.18 |
| 2ω | 56.74 | 18.23 | 5.82 |
Table 3
Table 4
Embodiment 2 basic lens datas
Table 5
The data that embodiment 2 is doubly relevant with change
| Wide-angle side | Middle | | |
| Variable | |||
| 1 | 0.688 | 16.177 | 26.222 |
| Variable 2 | 26.553 | 11.064 | 1.019 |
| |
10.574 | 5.983 | 10.915 |
| |
10.000 | 14.591 | 9.659 |
| f | 8.051 | 24.958 | 76.725 |
| FNo. | 1.67 | 1.99 | 2.22 |
| 2ω | 58.43 | 18.45 | 5.88 |
Table 6
Embodiment 2 aspherical surface datas
Table 7
Table 8
The data that embodiment 3 is doubly relevant with change
| Wide-angle side | Middle | | |
| Variable | |||
| 1 | 1.231 | 16.590 | 26.440 |
| Variable 2 | 26.340 | 10.981 | 1.131 |
| |
13.074 | 8.621 | 13.477 |
| |
10.000 | 14.453 | 9.597 |
| f | 8.064 | 25.000 | 76.854 |
| FNo. | 1.67 | 1.99 | 2.22 |
| 2ω | 58.43 | 18.45 | 5.88 |
Table 9
Table 10
Table 11
The data that embodiment 4 is doubly relevant with change
| Wide-angle side | Middle | | |
| Variable | |||
| 1 | 0.846 | 17.466 | 27.989 |
| Variable 2 | 28.390 | 11.770 | 1.247 |
| |
9.923 | 5.706 | 11.096 |
| |
10.000 | 14.217 | 8.827 |
| f | 8.103 | 25.120 | 77.223 |
| FNo. | 1.69 | 1.96 | 2.26 |
| 2ω | 57.12 | 18.23 | 5.82 |
Table 12
Table 13
Table 14
The data that embodiment 5 is doubly relevant with change
| Wide-angle side | Middle | | |
| Variable | |||
| 1 | 0.834 | 16.885 | 26.656 |
| Variable 2 | 27.500 | 11.449 | 1.678 |
| |
11.915 | 8.408 | 14.796 |
| |
10.000 | 13.507 | 7.119 |
| f | 8.291 | 29.392 | 79.011 |
| FNo. | 1.68 | 1.80 | 2.29 |
| 2ω | 55.60 | 17.85 | 5.69 |
Table 15
Table 16
Embodiment 6 basic lens datas
Table 17
The data that embodiment 6 is doubly relevant with change
| Wide-angle side | Middle | | |
| Variable | |||
| 1 | 1.083 | 17.728 | 28.381 |
| Variable 2 | 28.371 | 11.726 | 1.073 |
| |
11.258 | 7.157 | 12.771 |
| |
10.000 | 14.101 | 8.487 |
| f | 8.315 | 25.776 | 79.242 |
| FNo. | 1.71 | 1.83 | 2.30 |
| 2ω | 56.57 | 17.89 | 5.70 |
Table 18
Embodiment 6 aspherical surface datas
Conditional (1)～(8) corresponding value of the variable-power optical system of table 19 expression and embodiment 1～6.In addition, all embodiment all with the d line as reference wavelength, the value shown in the table of the data in the above-mentioned change doubly and the following table 19 is the value under this reference wavelength.
Table 19
| |
Embodiment 2 | |
|
|
Embodiment 6 | |
| (1)|fG2|/fw | 1.13 | 1.16 | 1.14 | 1.24 | 1.22 | 1.23 |
| (2)v2p | 33.8 | 23.8 | 29.9 | 55.5 | 23.8 | 39.2 |
| (3)dz2/fw | 3.09 | 3.17 | 3.13 | 3.35 | 3.11 | 3.34 |
| (4)|f1n|/fG1 | 2.33 | 2.31 | 1.68 | 2.13 | 2.30 | 2.36 |
| (5)v1n | 29.9 | 29.9 | 31.3 | 31.3 | 31.3 | 29.9 |
| (6)fG3/fw | 4.39 | 4.52 | 4.81 | 4.56 | 4.94 | 4.71 |
| (7)|f3p/f3n| | 0.38 | 0.40 | 0.43 | 0.37 | 0.50 | 0.51 |
| (8)f4pf/f4pr | 1.65 | 2.03 | 1.84 | 2.52 | 1.11 | .060 |
Fig. 8 (A)～Fig. 8 (I) representes each aberration diagram of the variable-power optical system of embodiment 1 respectively.Spherical aberration, curvature of the image, distortion aberration (distortion), Fig. 8 (D), Fig. 8 (E), Fig. 8 (F) that Fig. 8 (A), Fig. 8 (B), Fig. 8 (C) are illustrated respectively in wide-angle side is illustrated respectively in spherical aberration, curvature of the image, the distortion aberration (distortion) of middle focal length state, and Fig. 8 (G), Fig. 8 (H), Fig. 8 (I) are illustrated respectively in spherical aberration, curvature of the image, the distortion aberration (distortion) of telescope end.
In the figure of spherical aberration, represent the aberration relevant, represent and the relevant aberration of g line (wavelength 435.8nm), represent and the relevant aberration of C line (wavelength 656.3nm) with long dotted line with short dash line with the d line with solid line.In the figure of curvature of the image, expression and d line, g line, the relevant aberration of C line are represented with solid line sagitta of arc direction, and meridian direction is represented with dotted line.The figure of distortion aberration is relevant with the d line.The figure longitudinal axis of spherical aberration is corresponding with the F value.In the figure of curvature of the image and distortion aberration, the longitudinal axis is image height (unit is mm), and the minimum value of the longitudinal axis is 0.
Because image height 0 is on optical axis, therefore, the value of the sagitta of arc direction of image height 0 and the curvature of the image of meridian direction is consistent.Identical with the aberration curve of the position bottom of the longitudinal axis of spherical aberration diagram of putting in order by wavelength of the aberration curve of the image height 0 of curvature of the image figure by putting in order of wavelength.For example; The longitudinal axis of the spherical aberration diagram of Fig. 8 (A) under the position; Be arranged with the aberration curve of d line, g line, C line in order from a left side; In the position of the image height 0 of the curvature of the image figure of Fig. 8 (B), same, be arranged with sagitta of arc direction and the meridian direction of d line, sagitta of arc direction and meridian direction, the sagitta of arc direction of C line and the aberration curve of meridian direction of g line in order from a left side.
In addition, record the figure of distortion aberration through the TV distortion.The degree of being formed by optical system perpendicular to the distortion of the object picture of optical axis of planar object that will be vertical with optical axis is represented as the distortion aberration; Usually the numerical value of desirable image height and real image is high difference such as phtographic lens after divided by desirable image height is represented by percent; Relative with it; Use different therewith definitions in TV lens field, and with its as TV distortion distinguish.According to this definition, the amount of bow on the long limit of TV picture is handled as object and as deflection.
Particularly, owing to TV distortion DTV representes divided by the vertical long 2h of picture and by percent through the depth delta h of the bending on long limit, thus, represented like following formula.
DTV＝Δh/2h×100
In the distortion aberration diagram; To be made as apart from 4 points of picture 4 diagonal of optical axis center by high Y apart from the real image of optical axis; Suppose at rectangle plane object at object side by the image plane of these 4 bindings; The real image height of central portion on the limit, field of this picture is h, the optical axis of the point from vertical height to the diagonal angle difference be Δ h.Therefore, become aspect ratio different numerical, in the figure of the distortion aberration shown in Fig. 8 (C), Fig. 8 (F), Fig. 8 (I), become the figure that calculates with 3: 4 common ratio at the TV picture with picture.
Equally; Each aberration diagram of the variable-power optical system of Fig. 9 (A)～Fig. 9 (I) expression embodiment 2 at wide-angle side, middle focal length state, telescope end; Each aberration diagram of the variable-power optical system of Figure 10 (A)～Figure 10 (I) expression embodiment 3 at wide-angle side, middle focal length state, telescope end; Each aberration diagram of the variable-power optical system of Figure 11 (A)～Figure 11 (I) expression embodiment 4 at wide-angle side, middle focal length state, telescope end; Each aberration diagram of the variable-power optical system of Figure 12 (A)～Figure 12 (I) expression embodiment 5 at wide-angle side, middle focal length state, telescope end, each aberration diagram of the variable-power optical system of Figure 13 (A)～Figure 13 (I) expression embodiment 6 at wide-angle side, middle focal length state, telescope end.
Can know by above data, the variable-power optical system of embodiment 1～6 formula (1)～(8) that all satisfy condition, the F value is little to be become multiple proportions and is about 10 times to about 1.7, and each aberration that comprises aberration is proofreaied and correct well, has higher optical property.
Then, the camera head to embodiment of the present invention describes.In Figure 14, as the camera head of embodiment of the present invention one of example, the summary pie graph of camera head of the variable-power optical system of embodiment of the present invention is used in expression.As camera head, for example, can enumerate solid-state imagers such as CCD or CMOS as the rig camera of recording medium, video camera, electronic stills camera etc.
Variable-power optical system 1 possesses: when becoming times the fixing positive first lens combination G1, through move the second negative lens combination G2 that becomes doubly, aperture diaphragm St along optical axis Z, fixing positive the 3rd lens combination G3, the correction of following the image planes position that becomes times and positive the 4th lens combination G4 of focusing when becoming times.Figure 14 diagrammatically representes each lens combination.Imaging apparatus 3 will be transformed into electric signal by the optical image that variable-power optical system 1 forms, and this shooting face disposes according to the mode consistent with the image planes of variable-power optical system.Can use for example CCD or CMOS etc. as imaging apparatus 3.
More than, enumerate embodiment and embodiment describes the present invention, but the present invention is not limited to above-mentioned embodiment and embodiment, can carry out various distortion.For example, the radius-of-curvature of each lens composition, face interval, refractive index, Abbe number, asphericity coefficient equivalence are not limited at above-mentioned each numerical value embodiment and represent value, also desirable other value.
Claims (5)
1. variable-power optical system; Possess in order from object side: have positive refracting power and when becoming times fixing first lens combination, have negative refraction power and through move second lens combination that becomes doubly along optical axis, when becoming times fixing diaphragm, have positive refracting power and when becoming times fixing the 3rd lens combination, have positive refracting power and follow the correction of the image planes position that becomes times and the 4th lens combination that focuses on; It is characterized in that
Said second lens combination is to be arranged with negative lens, concave surface four formations towards the positive meniscus lens of object side, biconcave lens, positive lens in order from object side,
The focal length of said second lens combination is made as fG2; To be made as fw at the focal length of the total system of wide-angle side; The Abbe number to the d line of the said positive meniscus lens of said second lens combination is made as v2p; To be made as dz2 at amount of movement, satisfy following conditional (1)～(3) from said second lens combination of wide-angle side when telescope end becomes times:
1.0＜|fG2|/fw＜1.4...(1)
20＜v2p＜60...(2)
2.8＜dz2/fw＜3.5...(3)。
2. variable-power optical system as claimed in claim 1 is characterized in that,
Said first lens combination is three formations that are arranged with negative lens, biconvex lens, positive meniscus lens from object side in order,
The focal length of said first lens combination is made as fG1, the focal length of the said negative lens of said first lens combination is made as f1n, when the Abbe number to the d line of this negative lens is made as v1n, satisfy following conditional (4), (5):
1.5＜|f1n|/fG1＜2.6...(4)
28＜v1n＜33...(5)。
3. variable-power optical system as claimed in claim 1 is characterized in that,
Said the 3rd lens combination is two formations that are arranged with biconvex lens, negative lens from object side in order, and the said biconvex lens of said the 3rd lens combination has the aspheric surface of one side at least,
The focal length of said the 3rd lens combination is made as fG3, when the focal length of the said biconvex lens of said the 3rd lens combination and said negative lens is made as f3p, f3n respectively, satisfies following conditional (6), (7):
4.0＜fG3/fw＜5.5…(6)
0.3＜|f3p/f3n|＜0.6…(7)。
4. variable-power optical system as claimed in claim 1 is characterized in that,
Said the 4th lens combination is to be arranged with biconvex lens, a slice or two negative lenses, positive lens three in order from object side to constitute or four formations,
The focal length of the said biconvex lens of said the 4th lens combination is made as f4pf, said the 4th lens combination be made as f4pr near focal length as the said positive lens of side the time, satisfy following conditional (8):
0.3＜f4pf/f4pr＜2.7…(8)。
5. a camera head is characterized in that, it possesses each described variable-power optical system in the claim 1～4.
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| JP2010-193212 | 2010-08-31 | ||
| JP2010193212A JP5566814B2 (en) | 2010-08-31 | 2010-08-31 | Magnification optical system and imaging device |
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|---|---|---|---|---|
| CN102890335A (en) * | 2012-09-17 | 2013-01-23 | 河南中光学集团有限公司 | Double-field-of-view star position calibration digital lens optical system |
| CN107076967A (en) * | 2015-09-07 | 2017-08-18 | Hoya株式会社 | Endoscope-use variable-power optical system and endoscope |
| CN107209349A (en) * | 2014-12-26 | 2017-09-26 | 株式会社尼康 | Variable-power optical system, Optical devices, the manufacture method of variable-power optical system |
| CN110456493A (en) * | 2014-01-20 | 2019-11-15 | 株式会社尼康 | Optical system, photographic device and variable-power optical system |
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| US20050254138A1 (en) * | 2004-05-12 | 2005-11-17 | Pentax Corporation | Zoom lens system |
| US20050270661A1 (en) * | 2004-06-04 | 2005-12-08 | Norihiro Nanba | Zoom lens system and image pickup apparatus having the same |
| CN101063745A (en) * | 2006-04-25 | 2007-10-31 | 索尼株式会社 | Variable focal length lens system and imaging apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5229954B2 (en) * | 2009-01-08 | 2013-07-03 | 富士フイルム株式会社 | Zoom lens and imaging device |
-
2010
- 2010-08-31 JP JP2010193212A patent/JP5566814B2/en not_active Expired - Fee Related
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050254138A1 (en) * | 2004-05-12 | 2005-11-17 | Pentax Corporation | Zoom lens system |
| US20050270661A1 (en) * | 2004-06-04 | 2005-12-08 | Norihiro Nanba | Zoom lens system and image pickup apparatus having the same |
| CN101063745A (en) * | 2006-04-25 | 2007-10-31 | 索尼株式会社 | Variable focal length lens system and imaging apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890335A (en) * | 2012-09-17 | 2013-01-23 | 河南中光学集团有限公司 | Double-field-of-view star position calibration digital lens optical system |
| CN110456493A (en) * | 2014-01-20 | 2019-11-15 | 株式会社尼康 | Optical system, photographic device and variable-power optical system |
| CN107209349A (en) * | 2014-12-26 | 2017-09-26 | 株式会社尼康 | Variable-power optical system, Optical devices, the manufacture method of variable-power optical system |
| CN107076967A (en) * | 2015-09-07 | 2017-08-18 | Hoya株式会社 | Endoscope-use variable-power optical system and endoscope |
| CN107076967B (en) * | 2015-09-07 | 2020-09-01 | Hoya株式会社 | Zoom optical system for endoscope and endoscope |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102385145B (en) | 2015-04-01 |
| JP5566814B2 (en) | 2014-08-06 |
| JP2012053096A (en) | 2012-03-15 |
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