CN100547450C - Zoom lens - Google Patents
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- CN100547450C CN100547450C CNB2006101495651A CN200610149565A CN100547450C CN 100547450 C CN100547450 C CN 100547450C CN B2006101495651 A CNB2006101495651 A CN B2006101495651A CN 200610149565 A CN200610149565 A CN 200610149565A CN 100547450 C CN100547450 C CN 100547450C
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Abstract
The present invention discloses a kind of zoom lens, it includes several lens combination, these lens combination from object plane to image planes include first lens combination in regular turn with positive diopter, have negative dioptric second lens combination, have positive diopter the 3rd lens combination, have the 4th lens combination of positive diopter.By changing the spacing between second lens combination and the 3rd lens combination, can reach the effect of zoom.It is oversize to reach the required space of four times zoom ratio (Zoom Ratio) with three groups of zooms in the prior art, and employing four group zoom then must be considered the problem on lens numbers and the price, the present invention satisfies high picture element, short length overall and requirement cheaply then by special framework and adopt aspheric plastic lens to replace traditional glass lens.
Description
[technical field]
The invention relates to a kind of zoom lens, particularly improve the cost problem, and use the design of two groups of balsaming lenss and the mutual breasting of eyeglass to simplify the upright operation of group relevant for a kind of use plastic aspherical element lens and the synthetic lens of resin.
[background technology]
Early stage optical lens mostly is spheric glass, but the spherical mirror sector-meeting causes focus point inconsistent because of incident light from the axle distance, and produces the problem of spherical aberration (Spherical Aberration).Solution is to adopt the multi-disc lens to compensate, or adopts aspheric mirror.The mode of employing multi-disc lens compensation can cause the increase of the cost and the camera lens volume of zoom lens, and the mode of employing aspheric mirror is except that the recoverable Aberration Problem, and can use a slice aspheric mirror to replace several pieces spherical mirrors, reach the demand that reduces cost with light and handyization of product.Aspheric mirror adopts plastic material, and it is to be material with synthetic resin, therefore can use the mode of ejection formation, and a large amount of and manufacturing fast is to reduce cost.
With regard to designing, owing to the lens focus length of zoom lens can arbitrarily be adjusted, so on the problem of aberration under the various focal lengths of rectification and aberration, the condition of consideration is more, so difficult more on the design techniques.The example of existing Zoom lens structure can be referring to shown in Fig. 1.The patent of this class zoom lens is a lot, for example United States Patent (USP) No. 6744571, No. 6014268, No. 5712733, No. 5103343 etc.In these prior aries, improve the zoom ratio of zoom system, pancreatic system and can take two kinds of methods usually, an one method is to improve the diopter of variable focus lens package, but this can make variable focus lens package produce aberration; Another kind method is the displacement of elongating variable focus lens package, but this mode, the three groups of zooms will reach the mobile space of four times zoom ratio certainly will be bigger, therefore can cause the length of zoom lens longer, adopts the four group zoom then can reduce and move required space.Therefore if all adopt the sphere camera lens in the four group zoom,, can cause the increase of the cost of zoom lens and camera lens volume, weight then because of a large amount of lens of needs come aberration for compensation.
Therefore, be necessary to provide a kind of new zoom lens, to overcome shortcoming of the prior art.
[summary of the invention]
The object of the present invention is to provide a kind of zoom lens, it can use two non-spherical lenses and a slice resin compounded lens (Hybrid Lens) just can make up the high-resolution camera lens of the zoom that quadruples, thereby reduces lens numbers and reduce cost.
According to above-mentioned purpose of the present invention, the invention provides a kind of zoom lens, it includes several lens combination, is respectively first lens combination with positive diopter from object plane end to image planes end, is used to converge receipts light; Have negative dioptric second lens combination, be used to prolong focal length, increase zoom ratio; Aperture diaphragm; Have the 3rd lens combination of positive diopter, be used for aberration for compensation, be modified to the image position; The 4th lens combination with positive diopter is used for focusing, wherein second lens combination includes one first non-spherical lens, the 3rd lens combination includes a compound lens, and this compound lens forms at the additional resin bed of the side towards object plane of a positive lens, the 4th lens combination includes one second non-spherical lens, and first lens combination and the 4th lens combination are fixed, and second lens combination and the 3rd lens combination then can move with respect to the first, the 4th lens combination, to carry out zoom.
Above-mentioned the 3rd lens combination also has two and binds eyeglass, and second non-spherical lens of first non-spherical lens of second lens combination and the 4th lens combination is a plastic lens, and it has at least one aspheric surface.In addition, aperture diaphragm is movable in the process of zoom.
Compared to prior art, zoom lens of the present invention adopts the four group zoom to reach the zoom ratio that quadruples, will to reach the required space of four times of zoom ratios oversize to improve three groups of zooms, the present invention also uses two plastic aspherical element lens and a slice to mould the fat compound lens, reach and reduce lens numbers with the demand that reduces cost, and in the first lens combination G1, adopting the mode of next-door neighbour's breasting mutually, the mode that the second lens combination G2 adopts lens to bind with the 3rd lens combination G3 is conveniently organized upright.
[description of drawings]
Fig. 1 is the structural representation of existing zoom lens.
Fig. 2 is the structural representation of zoom lens of the present invention.
Fig. 3 is the thin portion structural representation of zoom lens shown in Fig. 2.
Fig. 4 is the lens specification figure of first embodiment of zoom lens shown in Fig. 3.
Fig. 5 is first embodiment of zoom lens shown in Fig. 3, the coefficient figure of its aspherical lens.
Fig. 6 is first embodiment of zoom lens shown in Fig. 3, the graph of a relation of variable spacing and system's effective focal length between its lens.
Fig. 7 is first embodiment of zoom lens shown in Fig. 3, and it is in the wide-angle configuration and the synoptic diagram of the lens combination position of the configuration of looking in the distance.
Fig. 8 is first embodiment of zoom lens shown in Fig. 3, longitudinal spherical aberration when it is in the wide-angle configuration and curvature of field figure.
Fig. 9 is first embodiment of zoom lens shown in Fig. 3, distortion when it is in the wide-angle configuration and lateral chromatic aberration figure.
Figure 10 is first embodiment of zoom lens shown in Fig. 3, and it is in longitudinal spherical aberration and curvature of field figure when looking in the distance configuration.
Figure 11 is first embodiment of zoom lens shown in Fig. 3, and it is in distortion and lateral chromatic aberration figure when looking in the distance configuration.
Figure 12 is the lens specification figure of second embodiment of zoom lens shown in Fig. 3.
Figure 13 is second embodiment of zoom lens shown in Fig. 3, the coefficient figure of its aspherical lens.
Figure 14 is second embodiment of zoom lens shown in Fig. 3, the graph of a relation of variable spacing and system's effective focal length between its lens.
Figure 15 is second embodiment of zoom lens shown in Fig. 3, and it is in the wide-angle configuration and the synoptic diagram of the lens combination position of the configuration of looking in the distance.
Figure 16 is second embodiment of zoom lens shown in Fig. 3, longitudinal spherical aberration when it is in the wide-angle configuration and curvature of field figure.
Figure 17 is second embodiment of zoom lens shown in Fig. 3, distortion when it is in the wide-angle configuration and lateral chromatic aberration figure.
Figure 18 is second embodiment of zoom lens shown in Fig. 3, and it is in longitudinal spherical aberration and curvature of field figure when looking in the distance configuration.
Figure 19 is second embodiment of zoom lens shown in Fig. 3, and it is in distortion and lateral chromatic aberration figure when looking in the distance configuration.
Figure 20 is the lens specification figure of the 3rd embodiment of zoom lens shown in Fig. 3.
Figure 21 is the 3rd embodiment of zoom lens shown in Fig. 3, the coefficient figure of its aspherical lens.
Figure 22 is the 3rd embodiment of zoom lens shown in Fig. 3, the graph of a relation of variable spacing and system's effective focal length between its lens.
Figure 23 is the 3rd embodiment of zoom lens shown in Fig. 3, and it is in the wide-angle configuration and the synoptic diagram of the lens combination position of the configuration of looking in the distance.
Figure 24 is the 3rd embodiment of zoom lens shown in Fig. 3, longitudinal spherical aberration when it is in the wide-angle configuration and curvature of field figure.
Figure 25 is the 3rd embodiment of zoom lens shown in Fig. 3, distortion when it is in the wide-angle configuration and lateral chromatic aberration figure.
Figure 26 is the 3rd embodiment of zoom lens shown in Fig. 3, and it is in longitudinal spherical aberration and curvature of field figure when looking in the distance configuration.
Figure 27 is the 3rd embodiment of zoom lens shown in Fig. 3, and it is in distortion and lateral chromatic aberration figure when looking in the distance configuration.
[embodiment]
See also Fig. 2 and shown in Figure 3, Fig. 2 is the structural representation of zoom lens of the present invention, and Fig. 3 is the detail drawing of Fig. 2, and zoom lens of the present invention from object plane to image planes is in regular turn: the first lens combination G1 with the first positive lens L1, first negative lens L2; The second lens combination G2 with the first aspheric mirror L3, the second negative lens L4, second positive lens L5; Diaphragm STOP; The 3rd lens combination G3 with the 3rd positive lens L6, the 4th positive lens L7, the 3rd negative lens L8; The 4th lens combination G4 with second aspheric mirror L9; Coated glass CG, it can be used to provide imaging effect preferably (as plating the film that antireflection or infrared ray filter).Mix the first lens combination G1 tool positive diopter at dioptric branch; The second lens combination G2 tool is born diopter; The 3rd lens combination G3 tool positive diopter; The 4th lens combination G4 tool positive diopter.Structurally, the first positive lens L1 of the first lens combination G1 and the first negative lens mirror L2 are close to breasting mutually; The second negative lens L4 and the second positive lens L5 of the second lens combination G2 bind mutually; The 4th positive lens L7 and the 3rd negative lens L8 of the 3rd lens combination G3 bind mutually.
In addition, the present invention sees through to adopt the first aspheric mirror L3 in the second lens combination G2, adopt the second aspheric mirror L9 and adopt the compound lens of being made up of resin bed P1 and the 3rd positive lens L6 to wait in the 3rd lens combination in the 4th lens combination G4 to replace a plurality of glass lenss, to reduce the quantity of lens.In addition, the present invention adopts the plastic material manufacturing with the first aspheric mirror L3 and the second aspheric mirror L9, is beneficial to produce and reduce the cost.
See also Fig. 4 to shown in Figure 11, Fig. 4 is the lens specification figure that sees through resulting first embodiment of optical design, and the relative aperture of this embodiment (F-number) is 2.8 to 4.3.See also shown in Figure 5, the compound lens that wherein demonstrates the first aspheric mirror L3, formed by resin bed P1 and the 3rd positive lens L6, and the aspheric surface correlation values of the second aspheric mirror L9, aspheric mirror satisfies following aspheric surface mathematical expression:
In the above-mentioned mathematical expression, arrow (Sag) amount that D is an aspherical lens from the relative height H of center of lens axle the time, H be aspherical lens in relative height from the center of lens axle, C is a vertex curvature, K is the constant of the cone (Conic Const) of aspherical lens, E
2iBe high-order aspheric surface correction factor.See also shown in Figure 6ly, wherein demonstrate after the scope of given effective focal length (EFL) variable spacing of four lens combination that calculate respectively.
See also shown in Figure 7, it is among first embodiment of zoom lens of the present invention, the position view of each lens combination when shortest focal length and longest focal length, from this figure as can be seen, when zoom lens is converted to when looking in the distance configuration from the wide-angle configuration, the first lens combination G1 and the 4th lens combination G4 maintain static, the second lens combination G2 and the 3rd lens combination G3 then change its position and spacing, and cooperate a movable diaphragm STOP, the feasible image that will take is looked it need do best enlargement ratio and image effect adjustment, and further the focal distance ratio absolute value by the first lens combination G1 and the second lens combination G2 is less than 0.4 and greater than 0.15; And the focal distance ratio absolute value of the second lens combination G2 and the 3rd lens combination G3 is less than 1.2 and greater than 0.55, proves implementation of the present invention.
Fig. 8 to Figure 11 is positioned at spherical aberration, curvature of field figure, distortion and lateral chromatic aberration figure under wide-angle configuration and the configuration of looking in the distance for first embodiment of zoom lens of the present invention, wherein Fig. 8 is the longitudinal spherical aberration figure and the curvature of field figure of wide-angle configuration, this spherical aberration diagram be incident light with three kinds of different wave length WV1, WV2, WV3 via zoom lens of the present invention after, height with incident ray is the longitudinal axis, transverse axis then be each light focus and with the difference of main shaft overlaid light focus; This curvature of field figure is an incident wave of getting the WV1 wavelength, and the longitudinal axis is a ratio visual angle coordinate, and transverse axis is aberration yardstick (mm), and T is tangential direction (Tangential), and S is sagitta of arc direction (Ssagittal), clear knows meridian direction and sagitta of arc direction focus relative position.Fig. 9 is the distortion figure and the lateral chromatic aberration figure of wide-angle configuration, and this distortion figure is an incident wave of getting the WV1 wavelength, and distortion adopts the number percent of desirable image height to represent, the figure shows the distortion degree less than 5%, negative value is represented barrel-shaped distortion, and overall image diminishes, and is also referred to as the minus distortion; This lateral chromatic aberration figure, the longitudinal axis is a ratio visual angle coordinate, transverse axis is the aberration yardstick, aberration is the incident light by different optical wavelength, they are the gait of march difference between lens, therefore the also different institutes of tortuous angle cause, P represents main lateral chromatic aberration (Primary Lateral Color), the effective focal length that is meant system is also different under different wave length, difference in this focal length causes the difference of power of lens color, S represents secondary lateral chromatic aberration (Secondary Lateral Color), is meant because of lens not cause with the linear change of wavelength.Figure 10 is look in the distance the longitudinal spherical aberration figure and the curvature of field figure of configuration, Figure 11 is look in the distance the distortion figure and the lateral chromatic aberration figure of configuration, this figure degree about 1% that distorts, on the occasion of being to represent negative distortion, it is big that overall image becomes, and is also referred to as the eurymeric distortion, generally speaking, the whole optics quality requirements of zoom lens of the present invention has been verified in the easier generation of the configuration distortion of looking in the distance of wide-angle configuration ratio by above-mentioned each figure.
The first embodiment of the invention that the front is illustrated, and second embodiment that hereinafter will illustrate and the 3rd embodiment are because of system's focal length follows field angle slightly variant, so cause the specification of lens also to change to some extent with required mobile distance between the lens combination.
See also Figure 12 to shown in Figure 19, wherein Figure 12 is the lens specification figure of the second embodiment of the present invention, the relative aperture of this embodiment (F-number) is 2.8 to 4.4, Figure 13 is the aspheric surface correlation values of second embodiment, Figure 14 be second embodiment after the scope of given effective focal length (EFL), the variable spacing of four lens combination that calculate respectively.Figure 15 among second embodiment of zoom lens of the present invention when shortest focal length and longest focal length the position view of each lens combination, Figure 16 to Figure 19 is spherical aberration, curvature of field figure, distortion and the lateral chromatic aberration figure of second embodiment under the wide-angle configuration and the configuration of looking in the distance of zoom lens of the present invention.
See also Figure 20 to shown in Figure 27, wherein Figure 20 is the lens specification figure of third embodiment of the invention, the relative aperture of this embodiment (F-number) is 2.8 to 4.3, Figure 21 is the aspheric surface correlation values of second embodiment, Figure 22 be the 3rd embodiment after the scope of given effective focal length (EFL), the variable spacing of four lens combination that calculate respectively.Figure 23 is among the 3rd embodiment of zoom lens of the present invention, the position view of each lens combination when shortest focal length and longest focal length, Figure 24 to Figure 27 is spherical aberration, curvature of field figure, distortion and the lateral chromatic aberration figure of the 3rd embodiment under the wide-angle configuration and the configuration of looking in the distance of zoom lens of the present invention.
In above-mentioned all embodiment, first lens combination of zoom lens of the present invention is to be used for the object plane of appointment is imaged onto on the object plane position of second lens combination requirement; Second lens combination is responsible for zoom, makes system can reach maximum zoom ratio; The 3rd lens combination is to produce the image planes change in location, to compensate the image planes displacement of second lens combination; The 4th lens combination is when the second lens combination imaging is not met system requirements, it to be imaged onto the image planes position of appointment.
First lens combination and second lens combination of zoom lens of the present invention will meet the following conditions:
Wherein F1 is the first combination of lenses coking distance, and F2 is the second lens combination focal length.Prescribe a time limit above last when following formula, the second lens combination focusing force (Power) can diminish, and total system can't reach balance, because second lens combination is the negative focal length of system.When following formula surpasses down in limited time, then be difficult in short distance, finish the high zoom multiplying power.When the spacing of first lens combination and second lens combination widened, the required external diameter of first eyeglass of first lens combination became big relatively, and also therefore thickness is forced to thickening, to keep machinable external diameter.
Second lens combination and the 3rd lens combination of zoom lens of the present invention will meet the following conditions:
Wherein F2 is the second combination of lenses coking distance, and F3 is the 3rd lens combination focal length.Prescribe a time limit above last when following formula, it is big that the 3rd lens combination focusing force becomes, and astigmatism increases fast.Prescribe a time limit when following formula surpasses down, then the 3rd lens combination focusing force diminishes, and overall optical system is elongated, can't satisfy the demand of compactness (Compact).
Generally speaking the design of Optical System flow process has following several steps:
(1) the optical system specification is stipulated: decision systems focal length, the pattern that field angle etc. and selection are share.
(2) elementary design: promptly arrange suitable Gaussian structures,, and consider that spherical aberration, coma and other aberration decide the shape of lens by the diopter configuration of system's focal length, aberration and system requirements decision lens.
(3) thickening of thin lens: mostly be to carry out theoretical systematic analysis in elementary design, yet do not have the thin lens of thickness and do not conform to reality with the pattern of thin lens, thus must give each lens rational thickness, and keep the structure of total system constant.
(4) optimize: after lens are added rational thickness,, get a suitable mirror group and analyze its imaging results, whether reach requirement with decision systems to the work that system is optimized.
The relevant specification MSDS of lens combination can be from last flow process, obtained, and the required mobile distance of lens combination can be calculated according to the effective focal length of system.
The otherness of zoom lens of the present invention and existing zoom lens is to adopt the four group zoom to reach the zoom ratio that quadruples, will to reach the required space of four times of zoom ratios oversize to improve three groups of zooms, and use two plastic aspherical element lens and a slice to mould the fat compound lens, reach and reduce lens numbers with the demand that reduces cost, and in the first lens combination G1, adopting the mode of next-door neighbour's breasting mutually, the mode that the second lens combination G2 adopts lens to bind with the 3rd lens combination G3 is conveniently organized upright.
Claims (17)
1. zoom lens, it includes in regular turn from object plane to image planes: first lens combination with positive diopter, has negative dioptric second lens combination, removable diaphragm, the 3rd lens combination with positive diopter, and the 4th lens combination with positive diopter, it is characterized in that: second lens combination includes one first non-spherical lens, the 3rd lens combination includes a compound lens, and this compound lens forms at the additional resin bed of the side towards object plane of a positive lens, the 4th lens combination includes one second non-spherical lens, and first lens combination and the 4th lens combination are fixed, second lens combination and the 3rd lens combination then can be with respect to first, the 4th lens combination moves, to carry out zoom.
2. zoom lens as claimed in claim 1 is characterized in that: first lens combination includes one first positive lens and one first negative lens.
3. zoom lens as claimed in claim 1 is characterized in that: second lens combination also includes one second negative lens and one second positive lens except that first non-spherical lens.
4. zoom lens as claimed in claim 1 is characterized in that: the 3rd lens combination also includes one the 4th positive lens and one the 3rd negative lens except that compound lens.
5. zoom lens as claimed in claim 1 is characterized in that: second aspheric mirror of the 4th lens combination has at least one aspheric surface.
6. zoom lens as claimed in claim 2 is characterized in that: first positive lens of first lens combination is next-door neighbour's first negative lens.
7. zoom lens as claimed in claim 1 is characterized in that: first non-spherical lens of second lens combination is to be made of plastics.
8. zoom lens as claimed in claim 3 is characterized in that: second negative lens of second lens combination is to be bonding on second positive lens.
9. zoom lens as claimed in claim 4 is characterized in that: the 4th positive lens of the 3rd lens combination is to be bonding on the 3rd negative lens.
10. zoom lens as claimed in claim 1 is characterized in that: second non-spherical lens of the 4th lens combination is to be made of plastics.
11. zoom lens as claimed in claim 1 is characterized in that: first aspheric mirror of second lens combination satisfies following aspheric surface mathematical expression:
Wherein, the vector that D is an aspherical lens from the relative height H of center of lens axle time the, H be aspherical lens in relative height from the center of lens axle, C is a vertex curvature, K is the constant of the cone of aspherical lens, E2i is a high-order aspheric surface correction factor.
12. zoom lens as claimed in claim 1 is characterized in that: second aspheric mirror of the 4th lens combination satisfies following aspheric surface mathematical expression:
Wherein, the vector that D is this aspherical lens from the relative height H of center of lens axle time the, H be aspherical lens in relative height from the center of lens axle, C is a vertex curvature, K is the constant of the cone of aspherical lens, E2i is a high-order aspheric surface correction factor.
13. zoom lens as claimed in claim 1 is characterized in that: the absolute value of the focal length ratio of first lens combination and second lens combination is between 0.15 and 0.4.
14. zoom lens as claimed in claim 1 is characterized in that: the absolute value of the focal length ratio of second lens combination and the 3rd lens combination is between 0.55 and 1.2.
15. zoom lens as claimed in claim 1 is characterized in that: this zoom lens also includes a slice coated glass, and it is arranged on the image planes side, in order to imaging effect preferably to be provided.
16. zoom lens as claimed in claim 15 is characterized in that: on coated glass, have the antireflection plated film.
17. zoom lens as claimed in claim 15 is characterized in that: on coated glass, have the infrared ray filtration membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101495651A CN100547450C (en) | 2006-11-20 | 2006-11-20 | Zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101495651A CN100547450C (en) | 2006-11-20 | 2006-11-20 | Zoom lens |
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| CN101191896A CN101191896A (en) | 2008-06-04 |
| CN100547450C true CN100547450C (en) | 2009-10-07 |
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| CNB2006101495651A Expired - Fee Related CN100547450C (en) | 2006-11-20 | 2006-11-20 | Zoom lens |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101706265B1 (en) * | 2009-12-04 | 2017-02-14 | 삼성전자주식회사 | Zoom lens and image pickup device having the same |
| CN102156343B (en) * | 2010-02-11 | 2013-03-13 | 亚洲光学股份有限公司 | Inner zoom lens |
| WO2013129487A1 (en) * | 2012-02-29 | 2013-09-06 | 株式会社ニコン | Variable-power optical system, optical device, and method for producing variable-power optical system |
| JP6830457B2 (en) * | 2018-03-29 | 2021-02-17 | 富士フイルム株式会社 | Lens device |
| JP7406899B2 (en) * | 2019-11-28 | 2023-12-28 | キヤノン株式会社 | Zoom lens and imaging device with it |
| CN113406779B (en) * | 2020-03-16 | 2022-11-18 | 华为技术有限公司 | Zoom lens, camera module and mobile terminal |
| CN112817134B (en) * | 2020-11-27 | 2022-07-01 | 河北汉光重工有限责任公司 | Short-wave infrared wide-spectrum four-component telephoto continuous zooming optical system |
| CN116724264A (en) * | 2021-04-01 | 2023-09-08 | 深圳市大疆创新科技有限公司 | Camera assembly, shooting device and movable platform |
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