CN108873279B - Plastic aspheric zoom lens - Google Patents
Plastic aspheric zoom lens Download PDFInfo
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- CN108873279B CN108873279B CN201810806925.3A CN201810806925A CN108873279B CN 108873279 B CN108873279 B CN 108873279B CN 201810806925 A CN201810806925 A CN 201810806925A CN 108873279 B CN108873279 B CN 108873279B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
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Abstract
The invention relates to a plastic aspheric zoom lens which comprises a front group compensation group and a rear group zoom group, wherein the front group compensation group and the rear group zoom group are sequentially arranged from front to back along an incident light path, the front group compensation group comprises a meniscus lens A, a biconcave lens B and a meniscus lens C from front to back along the incident light path, the rear group zoom group comprises a biconvex lens D, an aspheric surface E, an aspheric surface F, a veneer sheet G, a veneer sheet H and an aspheric surface I from front to back along the incident light path, the aspheric surface E, the aspheric surface F and the aspheric surface I form a separated aspheric surface group used for correcting spherical aberration and chromatic aberration, and an aspheric surface air gap used for compensating high-level aberration is arranged between the aspheric surface E and the aspheric surface F. The focal length is changed between 2.7mm and 13.5mm through the corresponding relation between the front compensation group and the back zoom group; the front group compensation group and the rear group zoom group are matched to realize day and night confocal function and can realize high resolution and low temperature drift functions.
Description
Technical Field
The invention relates to a plastic aspheric zoom lens.
Technical Field
Various zoom lenses with focal lengths ranging from 2.8mm to 12mm are applied to security systems in the market at present, but the zoom lens designed by using glass is difficult to meet market requirements in terms of pixels and performance. In order to improve the performance, improve the pixel, improve the zoom ratio, so use more glass lenses to reach the image quality of higher definition now, also consequently greatly increased product cost, lead to the product to promote the degree of difficulty. At present, in the security industry, the zoom lens with low cost, high image quality, low temperature drift and high zoom ratio has a real meaning.
Disclosure of Invention
In view of the above, the present invention provides a plastic aspheric zoom lens, which uses a point-to-point correspondence relationship between a front compensation group and a rear zoom group to change a focal length between 2.7mm and 13.5mm, and the front compensation group and the rear zoom group are matched to achieve a day-night confocal function and a high resolution and a low temperature drift function.
The technical scheme of the invention is as follows: a plastic aspheric zoom lens comprises a front group compensation group and a rear group zoom group, wherein the front group compensation group and the rear group zoom group are sequentially provided with a negative focal power and a positive focal power from front to back along an incident light path, the front group compensation group comprises a meniscus lens A, a biconcave lens B and a meniscus lens C from front to back along the incident light path, the rear group zoom group comprises a biconvex lens D, an aspheric surface E, an aspheric surface F, a veneer sheet G, a veneer sheet H and an aspheric surface I from front to back along the incident light path, the aspheric surface E, the aspheric surface F and the aspheric surface I form a separated aspheric surface group used for correcting spherical aberration and chromatic aberration, and an aspheric surface air gap used for compensating high-level aberration is arranged between the aspheric surface E and the aspheric surface F.
Further, the air space between the meniscus lens a and the biconcave lens B is 5mm, the air space between the biconcave lens B and the meniscus lens C is 0.6mm, the air space between the meniscus lens C and the biconvex lens D is 14mm, the air space between the biconvex lens D and the aspheric surface E is 3.35mm, the air space between the aspheric surface E and the aspheric surface F is 2.3mm, the air space between the aspheric surface F and the bonding sheet G is 1.3mm, the air space between the bonding sheet G and the bonding sheet H is 0.86mm, and the air space between the bonding sheet H and the aspheric surface I is 0.1 mm.
Further, a diaphragm J used for limiting light beams is arranged between the front group of compensation groups and the rear group of zoom groups, and an image surface K is arranged behind the rear group of zoom groups.
Further, the focal lengths of the meniscus lens a, the biconcave lens B, the meniscus lens C, the biconvex lens D, the aspheric surface E, the aspheric surface F, the veneer sheet G, the veneer sheet H and the aspheric surface I satisfy the following relationship: setting the short-focus focal length of the integral lens to be F, the focal length F1 of the meniscus lens A to be-4F < F1< -3F, the focal length F2 of the biconcave lens B to be-6F < F2< -5F, the focal length F3 of the meniscus lens C to be 7F < F3<8F, the focal length F4 of the diaphragm J to be 4F < F4<4.5F, the focal length F5 of the biconvex lens D to be 18F < F5<20F, the focal length F6 of the aspheric surface E to be 120F < F6<140F, the focal length F7 of the aspheric surface F to be-3F < F3< -2F, the focal length F8 of the cemented sheet G to be 2F < F8< F6863F, the focal length F6 of the cemented sheet H to be 2F < F9<3F, and the focal length F10F of the aspheric surface I to be 369F < 10F < 3F.
Further, the focal length f5 of the biconvex lens D is focused on the aspheric surface EThe distance f6 satisfies the relationship: -1.2mm<
< -0.8mm。
Compared with the prior art, the invention has the beneficial effects that:
(1) the focal length is changed between 2.7mm and 13.5mm through the corresponding relation between the front group compensation group and the back group zoom group;
(2) the front group compensation group with negative focal power and the rear group zoom group with positive focal power have complementary aberration, wherein the rear group zoom group is provided with an aspheric surface E, an aspheric surface F and an aspheric surface I which form a separated aspheric surface group capable of correcting spherical aberration and chromatic aberration, and air gaps between the aspheric surface E and the aspheric surface F can compensate high-level aberration, and the focal power of each aspheric surface is reasonably calculated to ensure that the focus of the lens is not deviated in high-temperature and low-temperature environments, so that the effect of day and night zoom is achieved, the lens can achieve high-quality pixels in the day and also has high image quality in the case of insufficient light or at night, and simultaneously can form perfect images in severe environments with different temperatures;
(3) the aspheric surface E, the aspheric surface F and the aspheric surface I are made of Plastic (PC), so that the cost is relatively low while the functions of correcting spherical aberration and chromatic aberration and compensating high-grade aberration are realized.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram of the optical path structure of the short focus of the optical system of the present invention;
FIG. 2 is a schematic diagram of the optical path structure of the optical system long focus of the present invention;
in the figure: 1-meniscus lens a; 2-biconcave lens B; 3-meniscus lens C; 4-a lenticular lens D; 5-aspheric surface E; 6-aspheric surface F; 7-glue slice G; 8-glue slice H; 9-aspheric surface I; 10-diaphragm J; 11-image plane K.
Detailed Description
As shown in fig. 1-2, a plastic aspheric zoom lens includes a front compensation group and a rear zoom group, wherein the front compensation group and the rear zoom group are sequentially arranged along an incident light path from front to back, the front compensation group includes a meniscus lens a, a biconcave lens B and a meniscus lens C along the incident light path from front to back, the rear zoom group includes a biconvex lens D, an aspheric surface E, an aspheric surface F, a cemented piece G, a cemented piece H and an aspheric surface I along the incident light path from front to back, the aspheric surfaces E, F and I form a separated aspheric surface group for correcting spherical aberration and chromatic aberration, and an aspheric air gap for compensating high-level aberration is arranged between the aspheric surface E and the aspheric surface F.
In this embodiment, the air space between the meniscus lens a and the biconcave lens B is 5mm, the air space between the biconcave lens B and the meniscus lens C is 0.6mm, the air space between the meniscus lens C and the biconvex lens D is 14mm, the air space between the biconvex lens D and the aspheric surface E is 3.35mm, the air space between the aspheric surface E and the aspheric surface F is 2.3mm, the air space between the aspheric surface F and the bonding sheet G is 1.3mm, the air space between the bonding sheet G and the bonding sheet H is 0.86mm, and the air space between the bonding sheet H and the aspheric surface I is 0.1 mm.
In this embodiment, a diaphragm J for limiting a light beam is disposed between the front group compensation group and the rear group zoom group, and an image plane K is disposed behind the rear group zoom group.
In this embodiment, the focal lengths of the meniscus lens a, the biconcave lens B, the meniscus lens C, the biconvex lens D, the aspheric surface E, the aspheric surface F, the veneer sheet G, the veneer sheet H, and the aspheric surface I satisfy the following relationships: setting the short-focus focal length of the integral lens to be F, the focal length F1 of the meniscus lens A to be-4F < F1< -3F, the focal length F2 of the biconcave lens B to be-6F < F2< -5F, the focal length F3 of the meniscus lens C to be 7F < F3<8F, the focal length F4 of the diaphragm J to be 4F < F4<4.5F, the focal length F5 of the biconvex lens D to be 18F < F5<20F, the focal length F6 of the aspheric surface E to be 120F < F6<140F, the focal length F7 of the aspheric surface F to be-3F < F3< -2F, the focal length F8 of the cemented sheet G to be 2F < F8< F6863F, the focal length F6 of the cemented sheet H to be 2F < F9<3F, and the focal length F10F of the aspheric surface I to be 369F < 10F < 3F.
In the present embodiment, the focal length f5 of the lenticular lens D and the focal length f6 of the aspherical surface E satisfy the relationship: -1.2mm<
< -0.8mm。
Watch I, optical element parameter watch
The specific implementation mode is as follows:
(1) when the lens is at the initial position, the distance between the front group and the diaphragm J10 is 14mm, the distance between the rear group and the diaphragm J10 is 8mm, at the moment, the negative focal power f = -8 of the front group is designed, the light divergence of the front group is realized, the positive focal power f =10 of the rear group is designed, the light convergence effect is realized, the light is finally converged on an image surface K, the focal length is 2.7mm, the front group correspondingly moves towards the diaphragm J10 along with the movement of the rear group towards the diaphragm J10, the focal length variation is realized, the ratio of the focal powers of the front group and the rear group is ensured (f front group/f rear group = -0.8), the image is always formed on the image surface K, the zooming is realized, and at the moment, when the rear group moves to the distance from the diaphragm J10 to the diaphragm J0.5, at the moment, the front group simultaneously moves to the distance from the diaphragm J10 to the diaphragm J;
(2) the optical power is negative, the light is diverged to form a virtual image, the light cannot converge to a point, the imaging chip cannot identify the virtual image, the positive optical power is compensated, the positive optical power converges the light, the diverged light can converge to a point and is identified by the chip, the aspheric surface E5, the aspheric surface F6 and the aspheric surface I9 in the back group zoom group form a separated aspheric surface, the directions of the light with different color wavelengths and the light with different positions can be controlled through the bending of different degrees and different directions of the surface, the light converges to a point on an image plane K to realize the correction of spherical aberration, chromatic aberration and high-grade aberration, the optical powers of different lenses expand at high temperature and contract at low temperature to cause the deviation of the image plane K, the positive optical power is negative when the temperature changes, the negative optical power is positive when the temperature changes, and controlling the positive and negative focal power ratio to ensure that the positive and negative focal powers have the same offset to the image surface K when the temperature changes so as to ensure zero offset of high-low temperature imaging and realize clear high-low temperature imaging.
The above-mentioned operation flow and software and hardware configuration are only used as the preferred embodiment of the present invention, and not to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or directly or indirectly applied to the related art, are included in the scope of the present invention.
Claims (4)
1. A plastic aspheric zoom lens is characterized in that: the optical zoom lens system comprises a front group compensation group and a rear group zoom group, wherein the front group compensation group and the rear group zoom group are sequentially arranged from front to back along an incident light path, the front group compensation group comprises a meniscus lens A, a biconcave lens B and a meniscus lens C from front to back along the incident light path, the rear group zoom group comprises a biconvex lens D, an aspheric surface E, an aspheric surface F, a veneer G, a veneer H and an aspheric surface I from front to back along the incident light path, the aspheric surface E, the aspheric surface F and the aspheric surface I form a separated aspheric surface group used for correcting spherical aberration and chromatic aberration, an aspheric surface air gap used for compensating high-level aberration is arranged between the aspheric surface E and the aspheric surface F, and focal lengths of the meniscus lens A, the biconcave lens B, the meniscus lens C, the biconvex lens D, the aspheric surface E, the aspheric surface F, the veneer G, the veneer H and the aspheric surface I satisfy the: setting the short-focus focal length of the integral lens to be F, the focal length F1 of the meniscus lens A to be-4F < F1< -3F, the focal length F2 of the biconcave lens B to be-6F < F2< -5F, the focal length F3 of the meniscus lens C to be 7F < F3<8F, the focal length F4 of the diaphragm J to be 4F < F4<4.5F, the focal length F5 of the biconvex lens D to be 18F < F5<20F, the focal length F6 of the aspheric surface E to be 120F < F6<140F, the focal length F7 of the aspheric surface F to be-3F < F3< -2F, the focal length F8 of the cemented sheet G to be 2F < F8< F6863F, the focal length F6 of the cemented sheet H to be 2F < F9<3F, and the focal length F10F of the aspheric surface I to be 369F < 10F < 3F.
2. The plastic aspheric zoom lens of claim 1, wherein: the air interval between meniscus lens A and biconcave lens B is 5mm, the air interval between biconcave lens B and meniscus lens C is 0.6mm, the air interval between meniscus lens C and biconvex lens D is 14mm, the air interval between biconvex lens D and aspheric surface E is 3.35mm, the air interval between aspheric surface E and aspheric surface F is 2.3mm, the air interval between aspheric surface F and veneer G is 1.3mm, the air interval between veneer G and veneer H is 0.86mm, the air interval between veneer H and aspheric surface I is 0.1 mm.
3. The plastic aspheric zoom lens of claim 1, wherein: and a diaphragm J used for limiting light beams is arranged between the front group of compensation groups and the rear group of zoom groups, and an image surface K is arranged behind the rear group of zoom groups.
4. The plastic aspheric zoom lens of claim 1, wherein: the focal length f5 of the lenticular lens D and the focal length f6 of the aspherical surface E satisfy the relationship: -1.2mm<
< -0.8mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810806925.3A CN108873279B (en) | 2018-07-21 | 2018-07-21 | Plastic aspheric zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810806925.3A CN108873279B (en) | 2018-07-21 | 2018-07-21 | Plastic aspheric zoom lens |
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| Publication Number | Publication Date |
|---|---|
| CN108873279A CN108873279A (en) | 2018-11-23 |
| CN108873279B true CN108873279B (en) | 2020-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810806925.3A Active CN108873279B (en) | 2018-07-21 | 2018-07-21 | Plastic aspheric zoom lens |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112346230A (en) * | 2020-11-30 | 2021-02-09 | 深圳融合光学科技有限公司 | High-resolution large-target-surface 4-10mm day and night zooming monitoring lens and imaging method |
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| EP1387200A1 (en) * | 2001-04-02 | 2004-02-04 | Matsushita Electric Industrial Co., Ltd. | Zoom lens and electronic still camera using it |
| US20120008036A1 (en) * | 2010-07-12 | 2012-01-12 | Panasonic Corporation | Zoom lens system, interchangeable lens apparatus and camera system |
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| CN108873279A (en) | 2018-11-23 |
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