CN2604696Y - Varifocus lens assembly - Google Patents
Varifocus lens assembly Download PDFInfo
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- CN2604696Y CN2604696Y CN 03203356 CN03203356U CN2604696Y CN 2604696 Y CN2604696 Y CN 2604696Y CN 03203356 CN03203356 CN 03203356 CN 03203356 U CN03203356 U CN 03203356U CN 2604696 Y CN2604696 Y CN 2604696Y
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Abstract
A combination of zoom lens comprises a first lens combination with negative refractive power, a second lens combination with positive refractive power, and a third lens combination with positive refractive power. The first lens combination is composed of a first lens unit with negative refractive power and a second lens unit with positive refractive power, wherein the first lens unit includes one negative lens and one aspherical negative lens, and the second lens unit includes one positive lens; the second lens combination is composed of an aperture stop, a first lens unit with positive concave lens, a second lens unit with positive refractive power, and a third lens unit with negative refractive power, wherein the first lens unit includes one positive lens, while the second lens unit with one positive lens that glue one positive lens and one negative lens together, and the third lens unit includes one aspherical negative lens; the third lens combination includes one positive lens, which is plated with multilayer film for preventing and filtering the infrared on the side towards objects in order to reduce the infrared influence on imaging.
Description
Technical field
The utility model relates to a kind of zoom lens combination, relates in particular to the zoom lens combination of zoom ratio about 3 that a kind of digital camera or similar system are used.
Background technology
Traditional zoom lens is mainly with the lens combination zoom of two groups of non-positive and negative arrangements of formula, though this zoom lens is structurally fairly simple, but zoom ratio is little, generally about 2 times, and when being applied to digital camera, because of its distance of exit pupil (exit pupil distance) weak point, easily cause four angular brightness deficiencies of image.
For obtaining preferable zoom ratio, prior art has disclosed three groups of formula zoom lens combinations, United States Patent (USP) the 6th as bulletin on October 16 calendar year 2001,304, No. 389, but the zoom ratio of the zoom lens of this patent disclosure also can only reach 2.5 times zoom ratio, still fails to reach the zoom ratio that digital camera requires 3.0 times, in addition, because three lens group of utilization, cause the camera lens total length oversize relatively, and three lens group must move forward and backward when zoom at optical axis direction respectively, the control difficulty is big, in addition, do not have the design that the control infrared ray disturbs in the zoom system, pancreatic system, easily cause the quality of image to descend.
In summary, the zoom lens of described prior art on reality is used, obviously exists inconvenience and defective, so be necessary to be improved.
Summary of the invention
At above-mentioned defective, the purpose of this utility model provides a kind of zoom lens combination, these zoom lens make up the distance of exit pupil that not only can extend, improve four angular brightness of image, and can reduce ultrared interference, improve image quality, and simple in structure, control easily, manufacturing technology requires low.
For achieving the above object, the utility model provides a kind of zoom lens combination, and it comprises one and has first lens combination of negative refractive power, and second lens combination and with positive refractive power has the 3rd lens combination of positive refractive power.This first lens combination is made up of second lens unit that first lens unit and with negative refractive power has positive refractive power, wherein first lens unit comprises that a slice negative lens and a slice have aspheric negative lens, and second lens unit comprises a slice positive lens; Second lens unit and one that first lens unit, that this second lens combination has a positive refractive power by aperture diaphragm, has a positive refractive power has the 3rd lens unit of negative refractive power and forms, wherein first lens unit comprises a slice positive lens, second lens unit is the positive lens that a slice positive lens and a slice negative lens gummed form, and the 3rd lens unit comprises that a slice has aspheric negative lens; The 3rd lens combination is fixed, distance of exit pupil can extend, improve four angular brightness of image, it comprises a slice positive lens, and this positive lens is coated with every the ultrared multilayer film of filter towards the face of thing side, to reduce the influence of infrared ray to imaging, and save the infrared ray filter plate, make camera lens shorter, parts reduces, and is easy to adjust and assembling.The aspheric surface design of said lens then can effectively be proofreaied and correct aberration and aberration, to improve image quality.
To achieve these goals, the utility model provides a kind of zoom lens combination, with order from the thing side, comprise: one has first lens combination of negative refractive power, this first lens combination comprises second lens unit that first lens unit and with negative refractive power has positive refractive power, this first lens unit comprises that a slice is negative lens and a slice double-concave negative lens of sphere towards the face of thing side, and this second lens unit comprises that a slice is the positive lens of convex surface towards the face of thing side; One has second lens combination of positive refractive power; One has positive refractive power the 3rd lens combination, and the 3rd lens combination comprises a slice positive lens, and wherein, the double-concave negative lens of first lens unit of this first lens combination one side at least is an aspheric surface; Second lens combination comprises the 3rd lens unit that second lens unit and that first lens unit, that aperture diaphragm, has positive refractive power has positive refractive power has negative refractive power, this first lens unit comprises a slice positive lens, this second lens unit comprises a slice positive lens and a slice negative lens, the 3rd lens unit comprises a slice negative lens, and this negative lens has at least one side to be aspheric surface; The 3rd lens combination is fixed.
Described zoom lens combination, wherein, two lens glues of second lens unit of this second lens combination are combined into a positive lens.
Described zoom lens combination, wherein, the negative lens of the 3rd lens unit of this second lens combination is the convex-concave negative lens.
Described zoom lens combination, wherein, the negative lens of the 3rd lens unit of this second lens combination is a double-concave negative lens.
Described zoom lens combination, wherein, these first lens, second lens and the 3rd lens combination satisfy following condition:
-2.7≤f1/fw≤-1.7
Wherein, f1 represents the focal length of first lens combination of zoom lens combination, and fw represents that zoom lens make up the focal length when being in the wide-angle attitude.
Described zoom lens combination, wherein, these first lens, second lens and the 3rd lens combination satisfy following condition:
1.7≤f2/fw≤2.2
Wherein, f2 represents the focal length of second lens combination of zoom lens combination, and fw represents that zoom lens make up the focal length when being in the wide-angle attitude.
Described zoom lens combination, wherein, the positive lens of the 3rd lens combination is the plano-convex positive lens.
Described zoom lens combination, wherein, the positive lens of the 3rd lens combination is the biconvex positive lens.
Described zoom lens combination, wherein, the positive lens of the 3rd lens combination is being coated with on the face of thing side every the ultrared multilayer film of filter.
The beneficial effects of the utility model are, can improve four angular brightness of image, reduce ultrared interference, and aberration correction and aberration improve image quality effectively, and simple in structure, control easily, manufacturing technology requires low.
Brief Description Of Drawings
Below in conjunction with accompanying drawing,, will make the technical solution of the utility model and other beneficial effects apparent by detailed description to preferred embodiment of the present utility model.
In the accompanying drawing,
Fig. 1 is the synoptic diagram that first embodiment of the utility model zoom lens combination is in the wide-angle attitude;
Fig. 2 is the synoptic diagram that the zoom lens combination of Fig. 1 is in the attitude of dolly-out,ing dolly-back;
Fig. 3 is the synoptic diagram that second embodiment of the utility model zoom lens combination is in the wide-angle attitude.
Fig. 4 is the synoptic diagram that the zoom lens combination of Fig. 3 is in the attitude of dolly-out,ing dolly-back;
Fig. 5 A to 5D is the various Aberration Analysis figure that the zoom lens combination of the utility model first embodiment is in the wide-angle attitude;
Fig. 6 A to 6D is the various Aberration Analysis figure that the zoom lens combination of the utility model first embodiment is in the attitude of dolly-out,ing dolly-back;
Fig. 7 A to 7D is the various Aberration Analysis figure that the zoom lens combination of the utility model second embodiment is in the wide-angle attitude;
Fig. 8 A to 8D is the various Aberration Analysis figure that the zoom lens combination of the utility model second embodiment is in the attitude of dolly-out,ing dolly-back.
Embodiment
Hereinafter, will describe the utility model in detail.
As shown in Figures 1 and 2, zoom lens of the present utility model combination with the order from the thing side, comprises second lens combination 200 and that first lens combination 100, with negative refractive power has positive refractive power and has the 3rd lens combination 300 of positive refractive power.Light is from the thing side, in regular turn by first lens combination, 100, the second lens combination 200 and the 3rd lens combination 300.
The 3rd lens combination 300 comprises a slice biconvex positive lens 301, and this biconvex positive lens 301 is coated with every the ultrared multilayer film of filter towards the face of thing side, can improve image quality.The 3rd lens combination 300 is fixed, and with the lengthening distance of exit pupil, improves four angular brightness of image, and makes camera lens shorter owing to not needing to establish infrared ray in addition every filter plate.Fix the 3rd lens combination 300, move first and second lens combination 100,200, make lens between wide-angle attitude (state of the shortest focal length of lens combination is provided) and the attitude of dolly-out,ing dolly-back (the longest focal length state of system is provided), change, and the focal length of lens also change thereupon.
Provide first lens combination 100 to have three lens based on zoom lens combination of the present utility model, first lens 111 is negative lens, material is the crown board eyeglass (crown glass) of high Abbe number, at least the one side of second lens 112 is a non-spherical lens, the 3rd lens 121 are positive lens, its material is flint glass (flint glass), the aberration and the aberration of first lens 111 of second, third sheet lens 112,121 recoverables.Second lens combination 200 is made up of four lens, is main focus lamp group, and the material of first and second sheet lens 211,221 is the crown board eyeglass of high index of refraction high Abbe number, and the 4th lens 231 are for having aspheric negative lens, in order to reduce aberration.The 3rd lens combination 300 comprises a slice positive lens 301, and this positive lens 301 is coated with every the ultrared multilayer film of filter towards the face of thing side, can improve image quality, and the 3rd lens combination 300 is fixing, the distance of exit pupil that can extend, thereby four angular brightness of raising image.In addition, first, second lens combination 100,200 all has aspheric mirror, can make the utility model use less eyeglass to realize that simpler, the compacter purpose and the zoom ratio of system still can reach 3, and aberration still may command is within the specific limits; And since non-spherical lens directly and the outside do not contact, can adopt plastic material to make, thereby make that native system is easy to manufacture, cost is low.
Please consult Fig. 3 and Fig. 4 again, second embodiment of the present utility model, present embodiment is similar to the embodiment of Figure 1 and Figure 2, and it comprises first lens combination, 100, the second lens combination 200 and the 3rd lens combination 300.First lens combination 100 is made up of first lens unit 110 and second lens unit 120, and first lens unit 110 comprises that negative glass lens 111 of convex-concave and negative plastic lens 112, the second lens units 120 of concave-concave comprise a slice convex-concave positive lens 121.Second lens combination 200 is made up of aperture diaphragm 201, first lens unit 210, second lens unit 220 and the 3rd lens unit 230.First lens unit 210 of second lens combination 200 comprises that a slice biconvex positive lens 211, the second lens units 220 comprise a slice biconvex positive lens 221 and comprise a negative lens 231 ' with concavo-convex negative lens 222, the three lens units 230 of a slice.The 3rd lens combination 300 comprises a positive lens 301 '.
Present embodiment and obvious different being of first embodiment: the negative lens of the 3rd lens unit 230 of second lens combination 200 is a slice double-concave negative lens 231 ', and aspheric surface is all used on the two sides, to effectively reduce aberration, make the zoom ratio of lens combination reach 3 o'clock aberrations and still can control within the specific limits; The positive lens of the 3rd lens combination 300 is a slice plano-convex positive lens 301 ', so that its easier plated film in plane towards the thing side.
In each embodiment, fix the 3rd lens combination, the distance that moves between first and second lens combination, 100,200, the first and second lens combination 100,200 will change thereupon, and satisfy following condition:
-2.7≤f1/fw≤-1.7
1.7≤f2/fw≤2.2
Wherein, f1 represents the focal length of first lens combination of zoom lens combination, and the focal length of f2 table the second lens combination, fw represent that zoom lens make up the focal length when being in the wide-angle attitude.
＜the first embodiment 〉
First embodiment of Fig. 1 and 2 expression zoom lens combinations, specific data are listed in Table 1, wherein, r represents the radius-of-curvature of lens surface, d represent lens surface between distance, v represents the Abbe number of lens, n represents the d line (refractive index of λ=587.6nm).
Fig. 5 A～5D and Fig. 6 A～6D are that the zoom lens combination of first embodiment is in the wide-angle attitude respectively and the various Aberration Analysis figure of the attitude of dolly-out,ing dolly-back, wherein, f represents the effective focal length of zoom lens combined system, ω represents the visual angle of zoom lens combination, d line (the spherical aberration curve of λ=587.6nm) is arranged in spherical aberration diagram, f line (the spherical aberration curve of λ=486.1nm) and c line (the spherical aberration curve of λ=656.3nm), in astigmatism figure, the S line is the radial astigmatism curve, and the T line is tangential astigmatism curve.Clearly among the figure show that various aberrations are effectively proofreaied and correct, and can obtain the image of better quality.
Table one
| r | d | v | | ||
| 1 | 15.663 | 1 | 41.01 | 1.88067 | |
| 2 | 7.334 | 2.527 | |||
| 3 | -64.490 | 0.598 | 57.44 | 1.49176 | Aspheric surface |
| 4 | 9.266 | 2.405 | Aspheric surface | ||
| 5 | 12.708 | 2.5 | 23.83 | 1.84667 | |
| 6 | 28.415 | 18.433 | |||
| 7 | ∞ | 0.993 | Aperture diaphragm | ||
| 8 | 15.451 | 2 | 46.38 | 1.80318 | |
| 9 | -117.146 | 0.93 | |||
| 10 | 8.075 | 2.5 | 84.47 | 1.48656 | |
| 11 | -8.075 | 2.2 | 35.83 | 1.66446 | |
| 12 | -19.193 | 0.564 | |||
| 13 | 13.003 | 0.6 | 29.91 | 1.58547 | Aspheric surface |
| 14 | 4.827 | 8.614 | Aspheric surface | ||
| 15 | 39.959 | 2.5 | 41.01 | 1.88067 | |
| 16 | -55.542 |
＜the second embodiment 〉
Second embodiment of Fig. 3 and 4 expression zoom lens combinations, specific data are listed in table two, and its special parameter meaning is described in first embodiment.
Fig. 7 A～7D and Fig. 8 A～8D are that the zoom lens combination of second embodiment is in the wide-angle attitude respectively and the various Aberration Analysis figure of the attitude of dolly-out,ing dolly-back, its symbolic significance is described in first embodiment, clearly among the figure show that various aberrations are effectively proofreaied and correct, and can obtain the image of better quality.
Table two
| r | d | v | | ||
| 1 | 21.435 | 1 | 40.8 | 1.88300 | |
| 2 | 7.433 | 2.054 | |||
| 3 | -34.090 | 1 | 56.10 | 1.53117 | Aspheric surface |
| 4 | 23.746 | 2.614 | Aspheric surface | ||
| 5 | 13.417 | 2 | 23.8 | 1.84666 | |
| 6 | 30.387 | 20.413 | |||
| 7 | ∞ | 1 | Aperture diaphragm | ||
| 8 | 8.692 | 1.327 | 46.5 | 1.80420 | |
| 9 | 94.293 | 0.955 | |||
| 10 | 8.917 | 2.2 | 70.4 | 1.48749 | |
| 11 | -8.917 | 1.2 | 25.5 | 1.80518 | |
| 12 | -36.318 | 0.315 | |||
| 13 | -8.909 | 1.2 | 29.91 | 1.58547 | Aspheric surface |
| 14 | 80.337 | 6.612 | Aspheric surface | ||
| 15 | ∞ | 2 | 40.8 | 1.88300 | |
| 16 | -26.201 |
Be understandable that; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to the technical solution of the utility model and technical conceive, and all these changes and distortion all should belong to the protection domain of the utility model accompanying Claim.
Claims (9)
1, a kind of zoom lens combination, with order from the thing side, comprise: one has first lens combination of negative refractive power, this first lens combination comprises second lens unit that first lens unit and with negative refractive power has positive refractive power, this first lens unit comprises that a slice is negative lens and a slice double-concave negative lens of sphere towards the face of thing side, and this second lens unit comprises that a slice is the positive lens of convex surface towards the face of thing side; One has second lens combination of positive refractive power; One has positive refractive power the 3rd lens combination, and the 3rd lens combination comprises a slice positive lens, it is characterized in that, the double-concave negative lens of first lens unit of this first lens combination one side at least is an aspheric surface; Second lens combination comprises the 3rd lens unit that second lens unit and that first lens unit, that aperture diaphragm, has positive refractive power has positive refractive power has negative refractive power, this first lens unit comprises a slice positive lens, this second lens unit comprises a slice positive lens and a slice negative lens, the 3rd lens unit comprises a slice negative lens, and this negative lens has at least one side to be aspheric surface; The 3rd lens combination is fixed.
2, zoom lens combination as claimed in claim 1 is characterized in that two lens glues of second lens unit of this second lens combination are combined into a positive lens.
3, zoom lens combination as claimed in claim 1 is characterized in that the negative lens of the 3rd lens unit of this second lens combination is the convex-concave negative lens.
4, zoom lens combination as claimed in claim 1 is characterized in that the negative lens of the 3rd lens unit of this second lens combination is a double-concave negative lens.
5, zoom lens as claimed in claim 1 combination is characterized in that, this first, second and the 3rd lens combination satisfy following condition:
-2.7≤f1/fw≤-1.7
Wherein, f1 represents the focal length of first lens combination of zoom lens combination, and fw represents that zoom lens make up the focal length when being in the wide-angle attitude.
6, zoom lens as claimed in claim 1 combination is characterized in that, this first, second and the 3rd lens combination satisfy following condition:
1.7≤f2/fw≤2.2
Wherein, f2 represents the focal length of second lens combination of zoom lens combination, and fw represents that zoom lens make up the focal length when being in the wide-angle attitude.
7, zoom lens combination as claimed in claim 1 is characterized in that the positive lens of the 3rd lens combination is the plano-convex positive lens.
8, zoom lens combination as claimed in claim 1 is characterized in that the positive lens of the 3rd lens combination is the biconvex positive lens.
9, zoom lens combination as claimed in claim 1 is characterized in that, the positive lens of the 3rd lens combination is being coated with on the face of thing side every the ultrared multilayer film of filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03203356 CN2604696Y (en) | 2003-02-18 | 2003-02-18 | Varifocus lens assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03203356 CN2604696Y (en) | 2003-02-18 | 2003-02-18 | Varifocus lens assembly |
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| Publication Number | Publication Date |
|---|---|
| CN2604696Y true CN2604696Y (en) | 2004-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03203356 Expired - Lifetime CN2604696Y (en) | 2003-02-18 | 2003-02-18 | Varifocus lens assembly |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424537C (en) * | 2005-09-09 | 2008-10-08 | 欣相光电股份有限公司 | Zoom lens |
| CN102707418A (en) * | 2006-02-13 | 2012-10-03 | 卡西欧计算机株式会社 | Zoom lens and camera with zoom lens |
| CN103645555A (en) * | 2013-12-25 | 2014-03-19 | 深圳市荣者光电科技发展有限公司 | Coaxial type super remote distance fold-back low-light ranging night vision big camera lens |
| CN103823295A (en) * | 2014-03-07 | 2014-05-28 | 福建福光数码科技有限公司 | Electric-zooming day and night dual-purpose pick-up lens |
| CN104423023A (en) * | 2013-08-22 | 2015-03-18 | 佳能株式会社 | Zoom lens and image pickup device including the same |
| CN106772966A (en) * | 2017-01-16 | 2017-05-31 | 东莞市宇瞳光学科技股份有限公司 | A kind of small volume resolution zoom lens high |
| CN113163075A (en) * | 2020-01-22 | 2021-07-23 | 华为技术有限公司 | Lens, camera module and terminal equipment |
-
2003
- 2003-02-18 CN CN 03203356 patent/CN2604696Y/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424537C (en) * | 2005-09-09 | 2008-10-08 | 欣相光电股份有限公司 | Zoom lens |
| CN102707418A (en) * | 2006-02-13 | 2012-10-03 | 卡西欧计算机株式会社 | Zoom lens and camera with zoom lens |
| CN102707418B (en) * | 2006-02-13 | 2014-08-06 | 卡西欧计算机株式会社 | Zoom lens and camera with zoom lens |
| CN104423023B (en) * | 2013-08-22 | 2017-08-11 | 佳能株式会社 | Zoom lens and the image pick up equipment comprising zoom lens |
| US9575296B2 (en) | 2013-08-22 | 2017-02-21 | Canon Kabushiki Kaisha | Zoom lens and image pickup device including the same |
| CN104423023A (en) * | 2013-08-22 | 2015-03-18 | 佳能株式会社 | Zoom lens and image pickup device including the same |
| CN103645555B (en) * | 2013-12-25 | 2016-04-13 | 深圳市荣者光电科技发展有限公司 | Coaxial type super remote distance fold-back low-light range finding night vision macro lens |
| CN103645555A (en) * | 2013-12-25 | 2014-03-19 | 深圳市荣者光电科技发展有限公司 | Coaxial type super remote distance fold-back low-light ranging night vision big camera lens |
| CN103823295A (en) * | 2014-03-07 | 2014-05-28 | 福建福光数码科技有限公司 | Electric-zooming day and night dual-purpose pick-up lens |
| CN106772966A (en) * | 2017-01-16 | 2017-05-31 | 东莞市宇瞳光学科技股份有限公司 | A kind of small volume resolution zoom lens high |
| CN113163075A (en) * | 2020-01-22 | 2021-07-23 | 华为技术有限公司 | Lens, camera module and terminal equipment |
| WO2021147828A1 (en) * | 2020-01-22 | 2021-07-29 | 华为技术有限公司 | Camera, photographing module, and terminal device |
| CN113163075B (en) * | 2020-01-22 | 2023-11-03 | 华为技术有限公司 | Lens, camera module and terminal equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130218 Granted publication date: 20040225 |