CN201845121U - Wide-band large-aperture optical lens with central wave length simultaneously considering near-infrared visible light - Google Patents
Wide-band large-aperture optical lens with central wave length simultaneously considering near-infrared visible light Download PDFInfo
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- CN201845121U CN201845121U CN2010205606212U CN201020560621U CN201845121U CN 201845121 U CN201845121 U CN 201845121U CN 2010205606212 U CN2010205606212 U CN 2010205606212U CN 201020560621 U CN201020560621 U CN 201020560621U CN 201845121 U CN201845121 U CN 201845121U
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Abstract
The utility model relates to a wide-band large-aperture optical lens with central wave length simultaneously considering near-infrared visible light, which is characterized in that an imaging surface from an object side to an imaging side sequentially includes an optical lens group consisting of a first lens, a second lens, a third lens, an aperture diaphragm, a fourth lens, a fifth lens and a sixth lens, the focal distance of the lens group is 27mm, the back focus of the lens group is larger than 6mm, and the view angle of the lens group is larger than 18 degrees. The wide-band large-aperture optical lens is clear in imaging and simple in structure, is low in cost as all the lens are made of common glass without aspheric surfaces, can be used under various illumination conditions, is especially applicable to environments which are dark and poor in visibility, and is widely used for monitoring systems of office places including financial places, insurance places and the like.
Description
Technical field
The utility model belongs to the optical imagery camera lens, and being specifically related to a kind of centre wavelength is the broadband large aperture optical lens that near infrared is taken into account visible light.
Background technology
At present, supervisory system all has been installed, has comprised under the measuring speed and taking snap pictures system of security system, road of office spaces such as finance, insurance, post and telecommunications and the abominable condition of work replacing the artificial detecting system that monitors etc. in many places.These supervisory systems adopts ready-made optical imagery camera lens, and optical imagery camera lens commonly used all adopts visual light imaging, and these camera lenses image quality under the sufficient situation of illumination is still good.But, image blur under dark and situation that visibility is not good, will there be very big problem in the sharpness of rig camera, brings very big difficulty to image recognition, causes misjudgment easily.
Infrared lens R and D of the prior art few, and the mode that adopts is the improvement of ordinary optical camera lens, such design proposal is at first to be to choose a kind of senior video camera, add a slice Infrared Lens again at camera lens front end or rear end then, as the disclosed content of patent CN00242036.8, so the video camera of selecting for use is required very harshly, both improved cost greatly, be difficult to realize strengthening the purpose of lens function again.
Summary of the invention
The purpose of this invention is to provide a kind of centre wavelength is the broadband large aperture optical lens that near infrared is taken into account visible light, to overcome existing rig camera in problem dark and the situation image blur that visibility is not good.
The technical solution of the utility model is: it is characterized in that comprising the optical lens group that first lens, second lens, the 3rd lens, aperture diaphragm, the 4th lens, the 5th lens and the 6th lens are formed along optical axis from object side in regular turn to the imaging surface of imaging side, the focal length of this lens combination is 27mm, rear cut-off distance is greater than 6mm, and field angle is greater than 18 °.
Wherein, the first, the 5th lens are plano-convex lenss of positive refractive index, and have protruding first and 1 second of being the plane to object side; Second lens are meniscuses of positive refractive index, and have protruding first and second to object side; Three, the 6th lens are biconcave lenss of negative refractive index; The 4th lens are biconvex lens of positive refractive index, and all lens all adopt spherical structure.
Because the ingenious combination of several lens of the present utility model can reach than higher pixel, particularly because second lens are the lens of positive refractive index, can reduce the positive refractive index of first lens, and make that described lens can overbend, and then can shorten the length of whole optical lens group.
Therefore, the utility model imaging is clear, and process structure is simple, all lens are all made by simple glass, do not use aspheric surface, and cost is low, can various light conditions be particularly useful for dark and environment that visibility is not good in, as under the measuring speed and taking snap pictures situation of night to vehicle.
Description of drawings
Fig. 1 is the structural representation of the utility model optical imagery camera lens.
Fig. 2 is the spherical aberration figure of the utility model optical imagery camera lens.
Wherein, 1, first lens; 2, second lens; 3, the 3rd lens; 4, aperture diaphragm; 5, the 4th lens; 6, the 5th lens; 7, the 6th lens; 8, imaging surface.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.
As shown in Figure 1, the utility model is that the imaging surface 8 to the imaging side includes in regular turn along optical axis from object side: the optical lens group that first lens 1, second lens 2, the 3rd lens 3, aperture diaphragm 4, the 4th lens 5, the 5th lens 6, the 6th lens 7 are formed; Wherein, the focal length of this lens combination is 27mm, and rear cut-off distance is greater than 6mm, and field angle is greater than 18 °.
The 3rd lens 3 are biconcave lenss of negative refractive index.
The 4th lens 5 are biconvex lens of positive refractive index.
The 5th lens 6 are plano-convex lenss of positive refractive index, and have protruding to first of object side and be second of plane.
The 6th lens 7 are biconcave lenss of negative refractive index.
The utility model adopts the image device of CCD as optical lens, and choosing the 880nm near infrared light is centre wavelength, takes into account visible light simultaneously, satisfies the broadband imaging of 400nm～950nm.
The material of all lens of the present utility model is all ordinary optical glass and makes, and is as shown in the table as specific embodiment:
The utility model is by the optical analysis software analysis, its optical property shows that optical transfer function of the present utility model (MTF) all is higher than 30% to the MTF of various visual fields, the image quality of this optical lens from the center to the visual field, edge is all very even as can be known, and promptly entire image is all very clear.By the ratio between brightness of analyzing prism head edge and the center brightness, show that the brightness at center of the present utility model and edge is more approaching, promptly the brightness of image is even.And the difference (aberration) during the optical lens imaging between actual picture and the ideal picture is little, and the area of disc of confusion is all less when different visual field; In addition, the curvature of field of the present utility model and distortion are all less.
The size of aberration on the axis of camera lens is learned by spherical aberration chart Mingguang City of Fig. 2 camera lens, and these four lines from left to right are illustrated in the spherical aberration under 486nm, 588nm, 656nm and four kinds of wavelength of 880nm successively, and as seen spherical aberration is all less when typical four kinds of wavelength.
Obviously, the utility model imaging is clear, the sharpness height of rig camera, and cost is low, and be widely used in the supervisory system of office spaces such as comprising finance, insurance.
Claims (7)
1. a centre wavelength is the large aperture optical imagery camera lens that near infrared is taken into account visible light simultaneously, it is characterized in that including in regular turn to the imaging surface of imaging side (8): the optical lens group that first lens (1), second lens (2), the 3rd lens (3), aperture diaphragm (4), the 4th lens (5), the 5th lens (6) and the 6th lens (7) constitute along optical axis from object side, the focal length of this lens combination is 27mm, rear cut-off distance is greater than 6mm, and field angle is greater than 18 °.
2. optical imagery camera lens according to claim 1 is characterized in that described first lens (1) are the plano-convex lenss of positive refractive index, and has protruding to first of object side and be second of plane.
3. optical imagery camera lens according to claim 1 is characterized in that described second lens (2) are the meniscuses of positive refractive index, and has protruding first and second to object side.
4. optical imagery camera lens according to claim 1 is characterized in that described the 3rd lens (3) are the biconcave lenss of negative refractive index.
5. optical imagery camera lens according to claim 1 is characterized in that described the 4th lens (5) are the biconvex lens of positive refractive index.
6. optical imagery camera lens according to claim 1 is characterized in that described the 5th lens (6) are the plano-convex lenss of positive refractive index, and has protruding to first of object side and be second of plane.
7. optical imagery camera lens according to claim 1 is characterized in that described the 6th lens (7) are the biconcave lenss of negative refractive index.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205606212U CN201845121U (en) | 2010-10-14 | 2010-10-14 | Wide-band large-aperture optical lens with central wave length simultaneously considering near-infrared visible light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205606212U CN201845121U (en) | 2010-10-14 | 2010-10-14 | Wide-band large-aperture optical lens with central wave length simultaneously considering near-infrared visible light |
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| Publication Number | Publication Date |
|---|---|
| CN201845121U true CN201845121U (en) | 2011-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205606212U Expired - Lifetime CN201845121U (en) | 2010-10-14 | 2010-10-14 | Wide-band large-aperture optical lens with central wave length simultaneously considering near-infrared visible light |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226890A (en) * | 2013-07-25 | 2016-12-14 | 大立光电股份有限公司 | Image lens assembly and image capturing device |
| CN106772929A (en) * | 2015-11-24 | 2017-05-31 | 三星电机株式会社 | Optical imaging system |
| CN109307923A (en) * | 2017-07-26 | 2019-02-05 | 先进光电科技股份有限公司 | Optical imaging system |
| CN110542994A (en) * | 2019-09-10 | 2019-12-06 | 厦门力鼎光电股份有限公司 | fisheye lens |
-
2010
- 2010-10-14 CN CN2010205606212U patent/CN201845121U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226890A (en) * | 2013-07-25 | 2016-12-14 | 大立光电股份有限公司 | Image lens assembly and image capturing device |
| CN106226890B (en) * | 2013-07-25 | 2018-05-18 | 大立光电股份有限公司 | Image lens assembly and image capturing device |
| CN106772929A (en) * | 2015-11-24 | 2017-05-31 | 三星电机株式会社 | Optical imaging system |
| US10527823B2 (en) | 2015-11-24 | 2020-01-07 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system |
| CN106772929B (en) * | 2015-11-24 | 2020-12-18 | 三星电机株式会社 | Optical imaging system |
| CN112305719A (en) * | 2015-11-24 | 2021-02-02 | 三星电机株式会社 | Optical imaging system |
| US11231562B2 (en) | 2015-11-24 | 2022-01-25 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system |
| US11789235B2 (en) | 2015-11-24 | 2023-10-17 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system |
| CN109307923A (en) * | 2017-07-26 | 2019-02-05 | 先进光电科技股份有限公司 | Optical imaging system |
| CN109307923B (en) * | 2017-07-26 | 2020-11-06 | 先进光电科技股份有限公司 | Optical imaging system |
| CN110542994A (en) * | 2019-09-10 | 2019-12-06 | 厦门力鼎光电股份有限公司 | fisheye lens |
| CN110542994B (en) * | 2019-09-10 | 2024-05-17 | 厦门力鼎光电股份有限公司 | Fish-eye lens |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110525 |
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| CX01 | Expiry of patent term |