CN204009199U - The low distortion of a kind of high definition wide-angle DV camera lens - Google Patents
The low distortion of a kind of high definition wide-angle DV camera lens Download PDFInfo
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- CN204009199U CN204009199U CN201420188234.9U CN201420188234U CN204009199U CN 204009199 U CN204009199 U CN 204009199U CN 201420188234 U CN201420188234 U CN 201420188234U CN 204009199 U CN204009199 U CN 204009199U
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Abstract
The utility model discloses the low distortion of a kind of high definition wide-angle DV camera lens.This camera lens comprises from object space and starts to be provided with successively first lens element, aperture member, the second lens element, the 3rd lens element, the 4th lens element; Described first lens element is to have positive focal power the protruding curved month type eyeglass to object space; Described the second lens element is the biconvex eyeglass with positive focal power; Described the 3rd lens element is the biconvex eyeglass with positive focal power; Described the 4th lens element is to have negative focal power the protruding curved month type eyeglass to image space.Only adopt 4 eyeglasses, make camera lens weight saving, cost, the effectively aberration in correcting optical system, reach gratifying optical characteristics and larger total field angle, object lens of large relative aperture and little distortion, TV distortion only 12%, have longer camera lens overall length is that TTL approaches 21mm simultaneously, and the resistance to 120 degree high temperature of tool, to meet the special applications requirement of DV.
Description
Technical field
The utility model relates to a kind of DV camera lens, relates in particular to the low distortion of a kind of high definition wide-angle DV camera lens.
Background technology
Along with the development of camera lens and electronic technology, camera lens has no longer merely been confined in camera system.Except traditional DV takes, camera lens also starts under the various video acquisition environment for other.The for example shooting of supervisory system to surrounding environment, various vehicle fittings comprise passenger vehicle in automobile, lorry, motorcycle etc., security in order to ensure driver in the time carrying out reverse action, avoid causing damage with car, people or other object collision, therefore install original the wide-angle lens for camera at vehicle rear, by the picture of this camera lens picked-up external object, transmit and allow the driver who is sitting in pilothouse watch judgement by circuit, guarantee the safety between vehicle and other object.But the wide-angle lens that in-vehicle camera is used at present, the general glass mirror composition adopting more than 6 or 6, this wide-angle lens not only weight is heavier, cost is higher, and when field angle exceedes after 90 °, distortion will be very serious, for this reason, the wide-angle lens of a lot of optics enterprise developments adopts aspheric surface technology, with weight reduction, cost and Reducing distortion amount, but the logical optical property of this camera lens a little less than, particularly along with the minimizing of eyeglass quantity, lens length is shorter, is not suitable for generally lens length being had the DV system of particular requirement.
Utility model content
The utility model proposes the high definition DV camera lens of a kind of super wide-angle, low distortion, large aperture
For realizing above-mentioned relating to, the utility model adopts with following technical proposals:
The low distortion of a kind of high definition wide-angle DV camera lens, it comprises from object space and starts to be provided with successively first lens element, aperture member, the second lens element, the 3rd lens element, the 4th lens element;
Described first lens element is to have positive focal power the protruding curved month type eyeglass to object space;
Described the second lens element is the biconvex eyeglass with positive focal power;
Described the 3rd lens element is the biconvex eyeglass with positive focal power;
Described the 4th lens element is to have negative focal power the protruding curved month type eyeglass to image space.
Wherein, described first lens element meets condition formula below:
Nd≥1.58，Vd≥58，
Wherein Nd represents the d optical index of first lens element material, and Vd represents the d light Abbe constant of first lens element material.
Wherein, described the second lens element meets condition formula below:
Nd≥1.74，Vd≥40，
Wherein Nd represents the d optical index of the second lens element material, and Vd represents the d light Abbe constant of the 3rd lens element material.
Wherein, described first lens element and the second lens element meet condition formula below:
2≥F2/F1≥1，
Wherein F1 represents the focal length value of first lens element, and F2 represents the focal length value of the second lens element.
Wherein, described the 3rd lens element and the 4th lens element meet condition formula below:
1.4≥F3/F4≥0.4，
Wherein F3 represents the focal length value of the 3rd lens element, and F4 represents the focal length value of the 4th lens element.
Wherein, described the 3rd lens element meets condition formula below:
2.1≥F3/F≥1.1，
Wherein F3 represents the focal length value of the 3rd lens element, and F represents the whole focal length value of the low distortion of described high definition wide-angle DV camera lens.
Wherein, the total field angle ω of the low distortion of described high definition wide-angle DV camera lens meets following formula: 2 ω=120 ~ 175 °.
Wherein, first lens element object space side outermost point to the distance of imaging surface of the low distortion of described high definition wide-angle DV camera lens will meet following formula: TTL >=20.4 mm.
Wherein, described first lens element, the second lens element, the 3rd lens element and the 4th lens element are glass lens element.
The beneficial effects of the utility model are: only adopt 4 eyeglasses, make camera lens weight saving, cost, the effectively aberration in correcting optical system, reach gratifying optical characteristics and wider total field angle, object lens of large relative aperture and little distortion, TV distortion only 12%, have longer camera lens overall length is that TTL approaches 21mm simultaneously, and the resistance to 120 degree high temperature of tool, can realize the camera lens requirement of 500W pixel scale, to meet the special applications requirement of DV.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing of required use during the utility model embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to the content of the utility model embodiment and these accompanying drawings other accompanying drawing.
Fig. 1 is structural representation of the present utility model (object space is in left-most position, and image space is in right-most position).
Fig. 2 is imaging process schematic diagram of the present utility model.
Fig. 3 is chromatic curve figure of the present utility model.
Fig. 4 is astigmatism curve map of the present utility model.
Fig. 5 is distortion curve figure of the present utility model.
Fig. 6 is MTF curve map of the present utility model.
Embodiment
For the technique effect that makes the technical scheme of technical matters, employing that the utility model solves and reach clearer, below in conjunction with accompanying drawing, the technical scheme of the utility model embodiment is described in further detail, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those skilled in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Please refer to Fig. 1, it is the structural representation of the low distortion of a kind of high definition wide-angle of the utility model DV camera lens, and as shown in Figure 1, it is applied to the video capture devices such as DV especially.Camera lens starts to be provided with successively first lens element L1, aperture member R3, the second lens element L2, the 3rd lens element L3, the 4th lens element L4 from object space;
Described first lens element L1 has positive focal power the protruding curved month type eyeglass to object space;
Described the second lens element L2 is the biconvex eyeglass with positive focal power;
Described the 3rd lens element L3 is the biconvex eyeglass with positive focal power;
Described the 4th lens element L4 has negative focal power the protruding curved month type eyeglass to image space.
Preferably, described first lens element L1 meets condition formula below:
Nd≥1.58，Vd≥58，
Wherein Nd represents the d optical index of first lens element L1 material, and Vd represents the d light Abbe constant of first lens element L1 material.
The utility model first lens element L1 adopts refractive index Nd >=1.58, and the high-refractivity and low-dispersion material of Abbe constant Vd >=58 can effectively import 140 ° of more than field angle light and reduce the bore of first eyeglass, to avoid volume excessive.
Wherein, described the second lens element L2 meets condition formula below:
Nd≥1.74，Vd≥40，
Wherein Nd represents the d optical index of the second lens element L2 material, and Vd represents the d light Abbe constant of the second lens element L2 material.
The second lens element L2 adopts refractive index Nd >=1.74, the high chromatic dispersion material of high index of refraction of Abbe constant Vd >=40.
Preferably, described first lens element L1 and the second lens element L2 meet condition formula below:
2≥F2/F1≥1
Wherein F1 represents the focal length value of first lens element L1, and F2 represents the focal length value of the second lens element L2.
The focal length value of first lens element L1 and the second lens element L2 will meet formula 2 >=F2/F1 >=1.
Preferably, described the 3rd lens element L3 and the 4th lens element L4 meet condition formula below:
1.4≥F3/F4≥0.4，
Wherein F3 represents the focal length value of the 3rd lens element L3, and F4 represents the focal length value of the 4th lens element L4.
The focal length value of the 3rd lens element L3 and the 4th lens element L4 will meet formula 1.4 >=F3/F4 >=0.4.
Wherein, described the 3rd lens element L3 meets condition formula below:
2.1≥F3/F≥1.1，
Wherein F3 represents the focal length value of the 3rd lens element L3, and F represents the whole focal length value of the low distortion of described high definition wide-angle DV camera lens.
When the whole focal length value of DV camera lens is F, when the 3rd lens element L3 focal length is F3,2.1 >=F3/F >=1.1 that must satisfy condition, the TTL length of this condition major control camera lens.
Wherein, the total field angle ω of the low distortion of described high definition wide-angle DV camera lens meets following formula: 2 ω=120 ~ 175 °.
Wherein, first lens element L1 object space side outermost point to the distance of imaging surface of the low distortion of described high definition wide-angle DV camera lens will meet following formula: TTL >=20.4 mm.
Wherein, described first lens element L1, the second lens element L2, the 3rd lens element L3 and the 4th lens element L4 are glass lens element.
The first lens element L1 of DV camera lens adopts glass mirror, can effectively protect in use scratch resistant scrape along opposing rugged environment variable effect of DV camera lens, the 3rd lens element L3 adopts high-dispersion glass eyeglass, the aberration of energy effective compensation optical system, and only use 4 sheet glass eyeglasses to replace traditional 5 sheet glass eyeglasses, can reduce eyeglass quantity and weight on the one hand, and reduce costs; The effective aberration in correcting optical system on the other hand, can realize the camera lens requirement of 500W pixel scale, reaches gratifying optical characteristics and wider total field angle by minimum eyeglass quantity.
In the implementation case, the whole focal length value of this DV camera lens is F, f-number is F/NO, field angle is 2 ω=170 °, camera lens overall length TTL approaches 20mm, and started by object space side, by each minute surface number consecutively, the curvature mirror radius of first lens element L1 is R1, R2, diaphragm face is R3, and the curvature mirror radius of the second lens element L2 is R4, R5, and the curvature mirror radius of the 3rd lens element L3 is R6, R7, the curvature mirror radius of the 4th lens element L4 is R8, R9, and the minute surface of color filter IR is R10, R11.
The utility model F=2.78mm, F/NO=2. 4,2 ω=170 °, TTL=19.97mm ± 0.3mm.
The utility model optical system parameter table is in table 1:
Fig. 2 is the imaging process schematic diagram corresponding to the present embodiment, Fig. 3 to Fig. 6 is the optical performance curve figure corresponding to the present embodiment, and wherein Fig. 3 is chromatic curve figure (also can be spherical aberration curve map), by the F commonly using, d. C tri-look light wavelengths represent, unit is mm.Fig. 4 is astigmatism curve map, and by the F commonly using, d. C tri-look light wavelengths represent, unit is nm.Fig. 5 is distortion curve figure, represents the distortion sizes values in different field angle situations, and unit is %.Fig. 6 is MTF curve map, has represented that the comprehensive solution of an optical system is as level.As seen from the figure, this DV camera lens by various optical aberration correctings to being enough to practical level.
In actual optical performance test process, optical specification is:
1.Sensor Size： 1/3″ For AR0330(3135)&0V5653
2.Focal Length(EFL)： f=2.78mm
3.F/N0(Infinite)： F/N0=2.4
4.Back Focal Length： BFL=4.85mm
5.Flange Back Length： FB=3.28
6.TTL： TTL=19.97mm±0.3mm
7.Field of View： 170°(MAX)
8.TV Distortion： 12%
9.Thread Size： M12*P0.5
10.Element： 4G+IR
11.IR Spec： T=50% @ 650±10nm。
Above content is only preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (8)
1. the low distortion of a high definition wide-angle DV camera lens, it comprises from object space and starts to be provided with successively first lens element, aperture member, the second lens element, the 3rd lens element, the 4th lens element; It is characterized in that,
Described first lens element is to have positive focal power the protruding curved month type eyeglass to object space;
Described the second lens element is the biconvex eyeglass with positive focal power;
Described the 3rd lens element is the biconvex eyeglass with positive focal power;
Described the 4th lens element is to have negative focal power the protruding curved month type eyeglass to image space;
Wherein, described first lens element meets condition formula below:
Nd≥1.58，Vd≥58，
Wherein Nd represents the d optical index of first lens element material, and Vd represents the d light Abbe constant of first lens element material.
2. the low distortion of a kind of high definition wide-angle according to claim 1 DV camera lens, is characterized in that, described the second lens element meets condition formula below:
Nd≥1.74，Vd≥40，
Wherein Nd represents the d optical index of the second lens element material, and Vd represents the d light Abbe constant of the second lens element material.
3. the low distortion of a kind of high definition wide-angle according to claim 1 DV camera lens, is characterized in that, described first lens element and the second lens element meet condition formula below:
2≥F2/F1≥1，
Wherein F1 represents the focal length value of first lens element, and F2 represents the focal length value of the second lens element.
4. the low distortion of a kind of high definition wide-angle according to claim 1 DV camera lens, is characterized in that, described the 3rd lens element and the 4th lens element meet condition formula below:
1.4≥F3/F4≥0.4，
Wherein F3 represents the focal length value of the 3rd lens element, and F4 represents the focal length value of the 4th lens element.
5. the low distortion of a kind of high definition wide-angle according to claim 1 DV camera lens, is characterized in that, described the 3rd lens element meets condition formula below:
2.1≥F3/F≥1.1，
Wherein F3 represents the focal length value of the 3rd lens element, and F represents the whole focal length value of the low distortion of described high definition wide-angle DV camera lens.
6. the low distortion of a kind of high definition wide-angle according to claim 1 DV camera lens, is characterized in that, the total field angle ω of the low distortion of described high definition wide-angle DV camera lens meets following formula: 2 ω=120 ~ 175 °.
7. the low distortion of a kind of high definition wide-angle according to claim 1 DV camera lens, is characterized in that, first lens element object space side outermost point to the distance of imaging surface of the low distortion of described high definition wide-angle DV camera lens will meet following formula: TTL >=20.4 mm.
8. according to the low distortion of a kind of high definition wide-angle DV camera lens described in claim 1 ~ 7 any one, it is characterized in that, described first lens element, the second lens element, the 3rd lens element and the 4th lens element are glass lens element.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420188234.9U CN204009199U (en) | 2014-04-17 | 2014-04-17 | The low distortion of a kind of high definition wide-angle DV camera lens |
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| CN201420188234.9U CN204009199U (en) | 2014-04-17 | 2014-04-17 | The low distortion of a kind of high definition wide-angle DV camera lens |
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| CN204009199U true CN204009199U (en) | 2014-12-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021031235A1 (en) * | 2019-08-16 | 2021-02-25 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| WO2021031282A1 (en) * | 2019-08-16 | 2021-02-25 | 诚瑞光学(常州)股份有限公司 | Photographing optical lens |
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2014
- 2014-04-17 CN CN201420188234.9U patent/CN204009199U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021031235A1 (en) * | 2019-08-16 | 2021-02-25 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| WO2021031282A1 (en) * | 2019-08-16 | 2021-02-25 | 诚瑞光学(常州)股份有限公司 | Photographing optical lens |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20170417 |
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| CF01 | Termination of patent right due to non-payment of annual fee |