CN202281857U - Double telecentric lens - Google Patents
Double telecentric lens Download PDFInfo
- Publication number
- CN202281857U CN202281857U CN2011204329522U CN201120432952U CN202281857U CN 202281857 U CN202281857 U CN 202281857U CN 2011204329522 U CN2011204329522 U CN 2011204329522U CN 201120432952 U CN201120432952 U CN 201120432952U CN 202281857 U CN202281857 U CN 202281857U
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- lens
- refractive power
- lens group
- positive refractive
- mirror head
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Abstract
The utility model discloses a double-telecentric lens, comprising a front lens group possessing a positive refractive capacity and of which the position can be moved along an optical axis direction, a back lens group possessing the positive refractive capacity and of which the position can be moved along the optical axis direction, and a diaphragm located on the image focal plane of the front lens group; wherein, the front lens group, the back lens group and the diaphragm are arranged orderly from an object side to an image side, and the front lens group and the back lens group satisfy the following formula: 7.5 < f1/f2< 8.5. The double telecentric lens having the above structure is simple in structure, short in work distance and good in image quality.
Description
Technical field
The utility model relates to zoom lens, especially a kind of pair of telecentric mirror head.
Background technology
Present known pair of telecentric optical system, that is, lens combination is made up of front side lens combination and these two parts of rear side lens group, makes the rear side focus and the arrangement setting that the front side focus of rear side lens group overlaps of front side lens combination, is provided with aperture in this focal position.
The telecentric lens optical system is characterised in that, object visual field broad, and depth of focus is darker, and is decided by the focal length of front side lens combination and rear side lens group.Therefore, the telecentric lens optical system is used to observe blade, mechanical component mostly, the electronic component that assembled etc. needs the higher object of accuracy of observation.Yet the particularly two telecentric mirror heads of present telecentric lens optical system exist mostly that camera lens is long, camera lens is big, and eyeglass very heavily waits problem; This just causes using inconvenient, and complex structure, and cost is high; If design unreasonablely, the eyeglass difficulty of processing is big, and cost is higher.
The utility model content
The purpose of the utility model is to solve above-mentioned existing issue, and a kind of simple in structure, operating distance is short, picture element is good two telecentric mirror heads are provided.
In order to reach above-mentioned technical purpose, the utility model adopts following technical scheme:
A kind of pair of telecentric mirror head comprises the following assembly of arranging successively from the object side to image side
Front lens group, having positive refractive power and position can move along optical axis direction;
Rear lens group, having positive refractive power and position can move along optical axis direction;
Diaphragm is positioned on picture side's focal plane of front lens group;
Front lens group and rear lens group satisfy following formula
7.5＜f
1/f
2＜8.5
Wherein: f
1Represent the focal length value of front lens group, f
2Represent the focal length value of rear lens group.
Above-mentioned pair of telecentric mirror head, said front lens group comprise first lens with positive refractive power at least and have second lens of negative refractive power.
Above-mentioned pair of telecentric mirror head, said rear lens group comprise first lens with positive refractive power, the 3rd lens that have second lens of negative refractive power and have positive refractive power successively at least.
Owing to have said structure, the utility model is compared prior art and is had the following advantages:
1, the two telecentric mirror heads of the utility model, lens arrangement is simple, and is easy to process.
2, the two telecentric mirror heads of the utility model, operating distance is shorter, and is easy to adjust.
3, the two telecentric mirror heads of the utility model, image distortion is less, good imaging quality.
Description of drawings
Fig. 1 is the light path synoptic diagram of the two telecentric mirror head embodiment of the utility model.
Fig. 2 is the two telecentric mirror head embodiment spherical aberration figure of the utility model.
Fig. 3 is the two telecentric mirror head embodiment curvature of field distortion figure of the utility model
Fig. 4 is the two telecentric mirror head embodiment chromaticity difference diagrams of the utility model
Fig. 5 is the two telecentric mirror head embodiment RayFan figure of the utility model
Fig. 6 is the two telecentric mirror head embodiment MTF figure of the utility model
Fig. 7 is the two telecentric mirror head embodiment illumination figure of the utility model
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further explained:
The utility model provides a kind of pair of telecentric mirror head, comprises the following assembly of arranging successively from the object side to image side
Front lens group, having positive refractive power and position can move along optical axis direction;
Rear lens group, having positive refractive power and position can move along optical axis direction;
Diaphragm is positioned on picture side's focal plane of front lens group;
Front lens group and rear lens group satisfy following formula
7.5＜f
1/f
2＜8.5
Wherein: f
1Represent the focal length value of front lens group, f
2Represent the focal length value of rear lens group.
Two telecentric mirror heads of this structure in the zoom process, can move the object space interarea to picture side, move to object space as square interarea, have shortened operating distance.
Said front lens group comprises first lens with positive refractive power at least and has second lens of negative refractive power.
Above-mentioned front lens group lens are preferably aplanat, can or separate two lens gummeds all can.
Said rear lens group comprises first lens with positive refractive power, the 3rd lens that have second lens of negative refractive power and have positive refractive power at least.
Because two telecentric mirror head systems require than higher length, the whole image picture element is consistent with well.Therefore, rear lens group choose reasonable focal length is extremely important.Consider its operating distance, the focal length of rear lens group is preferably about 10-20mm.The lens combination number of the too short then rear lens group of focal length increases, and structure is too complicated, is unfavorable for processing and reducing cost; The long operating distance that then is unfavorable for of focal length shortens.
Among the embodiment 1 as shown in Figure 1, the utility model provides a kind of pair of telecentric mirror head, and its composition from the object space side is in order:
Front lens group comprises two lens G1, G2 and the lens G3 with negative refractive power with positive refractive power, and G1, G2 are crown glass, and G3 is a flint glass.G1, G2 are positive light cokes, can play brought forward group positive light coke respectively, reduce spherical aberration.G3 can play aberration, the curvature of field effect of offsetting.Appropriate separation G3 one segment distance can correcting astigmatism, coma.G3 shortens to system length also has the contribution effect.
Rear lens group comprises the lens G4 with positive refractive power, the lens G5 with negative refractive power, the lens G6 with negative refractive power and the lens G7 with positive refractive power, G8 successively.The focal length of rear lens group is 18mm.
Adopt the concrete data (S1-S19 refers to 19 minute surfaces) as shown in the table of the present embodiment of said structure:
| Radius-of-curvature | Thickness | Kind | Clear aperature | |
| Object space | INFINITY | 230 | 62.61 | |
| S1 | 107.7213 | 10 | H-ZK14 | 69.80155 |
| S2 | 1109.739 | 6.502437 | 68.67394 | |
| S3 | 111.3461 | 10 | H-FK61 | 64.89277 |
| S4 | -221.9492 | 18.35715 | 63.64074 | |
| S5 | -114.1181 | 4.2 | H-ZF11 | 47.81396 |
| S6 | 1279.754 | 94.55381 | 45.9553 | |
| Diaphragm | Infinity | 6.961211 | 4.159321 | |
| S8 | 13.67372 | 1.76 | H-LAF2 | 7.28356 |
| S9 | -65.4278 | 0.1 | 7.278223 | |
| S10 | 54.94965 | 1.73 | F3 | 7.24931 |
| S11 | 8.912106 | 2.193125 | 7.003663 | |
| S12 | -5.493491 | 1.52 | F3 | 7.07548 |
| S13 | Infinity | 0.407061 | 9.59717 | |
| S14 | -32.94144 | 2.2 | H-LAK6 | 9.698936 |
| S15 | -8.762906 | 0.1 | 10.56496 | |
| S16 | 42.89495 | 2.51 | H-LAK6 | 12.46967 |
| S17 | -15.14909 | 1 | 12.65776 | |
| S18 | Infinity | 0.75 | BK7 | 12.10574 |
| S19 | Infinity | 18.15499 | 11.99247 | |
| Picture side | Infinity | 7.81406 |
Referring to accompanying drawing 2, the spherical aberration of two telecentric mirror heads of the foregoing description has obtained sufficient correction simultaneously.According to field, the left side diagram of accompanying drawing 3 and the distortion figure on right side, the distortion of present embodiment is less than 0.2%.Basic accompanying drawing 4 can know that the aberration of present embodiment, photochromic difference of all kinds are all proofreaied and correct within the AIRY spot, reach requirement.Can know that according to accompanying drawing 5-7 comprehensive aberration, picture element and the illumination of present embodiment all reach requirement.
Above-mentioned two telecentric mirror heads, in order to eliminate the susceptibility of system, can also be with gluing together between second lens G6 with negative refractive power and second lens G7 with positive refractive power.
Claims (9)
1. a two telecentric mirror head is characterized in that: comprise the following assembly of arranging successively from the object side to image side
Front lens group, having positive refractive power and position can move along optical axis direction;
Rear lens group, having positive refractive power and position can move along optical axis direction;
Diaphragm is positioned on picture side's focal plane of front lens group;
Front lens group and rear lens group satisfy following formula
7.5＜f
1/f
2＜8.5
Wherein: f
1Represent the focal length value of front lens group, f
2Represent the focal length value of rear lens group.
2. according to claim 1 pair of telecentric mirror head is characterized in that: said front lens group comprises first lens with positive refractive power at least and has second lens of negative refractive power.
3. according to claim 2 pair of telecentric mirror head is characterized in that: said front lens group lens are aplanat.
4. according to claim 2 pair of telecentric mirror head is characterized in that: said front lens group comprises first lens, second lens with positive refractive power successively and has the 3rd lens of negative refractive power.
5. according to claim 1 pair of telecentric mirror head is characterized in that: said rear lens group comprises first lens with positive refractive power, the 3rd lens that have second lens of negative refractive power and have positive refractive power at least.
6. according to claim 5 pair of telecentric mirror head is characterized in that: said rear lens group comprises first lens, second lens with negative refractive power with positive refractive power, the 3rd lens with negative refractive power, the 5th lens that have the lens of the 4th of positive refractive power and have positive refractive power successively.
7. according to claim 6 pair of telecentric mirror head is characterized in that: the back group has the two-sided picture side that all bends towards of second lens of negative refractive power.
8. according to claim 6 pair of telecentric mirror head is characterized in that: back group has the 3rd lens of negative refractive power and has between the 4th lens of positive refractive power glues together.
9. according to claim 5 pair of telecentric mirror head is characterized in that: the focal length of said rear lens group is about 10-20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204329522U CN202281857U (en) | 2011-11-04 | 2011-11-04 | Double telecentric lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204329522U CN202281857U (en) | 2011-11-04 | 2011-11-04 | Double telecentric lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202281857U true CN202281857U (en) | 2012-06-20 |
Family
ID=46228020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204329522U Expired - Fee Related CN202281857U (en) | 2011-11-04 | 2011-11-04 | Double telecentric lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202281857U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076496A (en) * | 2014-07-02 | 2014-10-01 | 中国科学院长春光学精密机械与物理研究所 | Double-telecentric hartmann sensor continuous zooming relay camera lens |
| CN105765339A (en) * | 2013-11-29 | 2016-07-13 | 克劳迪奥·塞达扎里 | Telecentric lens |
| CN106017318A (en) * | 2016-05-13 | 2016-10-12 | 西安远心光学***有限公司 | Visual measurement optical system device |
| CN106154517A (en) * | 2015-04-08 | 2016-11-23 | 广州长步道光电科技有限公司 | Doubly telecentric tight shot |
| CN108107557A (en) * | 2018-01-10 | 2018-06-01 | 佛山华国光学器材有限公司 | A kind of high magnification bilateral telecentric lens of long reach |
| CN108594424A (en) * | 2018-06-05 | 2018-09-28 | 宾努克斯科技（佛山）有限公司 | A kind of zoomable doubly telecentric optical detection apparatus |
| CN110989137A (en) * | 2019-12-20 | 2020-04-10 | 东莞市普密斯精密仪器有限公司 | Double-telecentric lens |
| CN110989142A (en) * | 2019-12-30 | 2020-04-10 | 中国科学院长春光学精密机械与物理研究所 | Preposed common-caliber dual-waveband achromatic lens of Fourier transform imaging spectrometer |
| CN112099204A (en) * | 2020-11-16 | 2020-12-18 | 北京领邦智能装备股份公司 | Lens assembly, imaging device, detection device and detection system |
-
2011
- 2011-11-04 CN CN2011204329522U patent/CN202281857U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105765339A (en) * | 2013-11-29 | 2016-07-13 | 克劳迪奥·塞达扎里 | Telecentric lens |
| CN105765339B (en) * | 2013-11-29 | 2018-09-25 | 奥普图工程股份有限公司 | Telecentric lens |
| CN104076496A (en) * | 2014-07-02 | 2014-10-01 | 中国科学院长春光学精密机械与物理研究所 | Double-telecentric hartmann sensor continuous zooming relay camera lens |
| CN106154517A (en) * | 2015-04-08 | 2016-11-23 | 广州长步道光电科技有限公司 | Doubly telecentric tight shot |
| CN106154517B (en) * | 2015-04-08 | 2019-01-11 | 广州长步道光电科技有限公司 | Doubly telecentric tight shot |
| CN106017318A (en) * | 2016-05-13 | 2016-10-12 | 西安远心光学***有限公司 | Visual measurement optical system device |
| CN108107557B (en) * | 2018-01-10 | 2024-01-16 | 佛山华国光学器材有限公司 | High-magnification double-side telecentric lens with long working distance |
| CN108107557A (en) * | 2018-01-10 | 2018-06-01 | 佛山华国光学器材有限公司 | A kind of high magnification bilateral telecentric lens of long reach |
| CN108594424A (en) * | 2018-06-05 | 2018-09-28 | 宾努克斯科技（佛山）有限公司 | A kind of zoomable doubly telecentric optical detection apparatus |
| CN110989137B (en) * | 2019-12-20 | 2022-03-11 | 东莞市普密斯精密仪器有限公司 | Double-telecentric lens |
| CN110989137A (en) * | 2019-12-20 | 2020-04-10 | 东莞市普密斯精密仪器有限公司 | Double-telecentric lens |
| CN110989142A (en) * | 2019-12-30 | 2020-04-10 | 中国科学院长春光学精密机械与物理研究所 | Preposed common-caliber dual-waveband achromatic lens of Fourier transform imaging spectrometer |
| CN110989142B (en) * | 2019-12-30 | 2021-07-06 | 中国科学院长春光学精密机械与物理研究所 | Preposed common-caliber dual-waveband achromatic lens of Fourier transform imaging spectrometer |
| CN112099204A (en) * | 2020-11-16 | 2020-12-18 | 北京领邦智能装备股份公司 | Lens assembly, imaging device, detection device and detection system |
| WO2022100271A1 (en) * | 2020-11-16 | 2022-05-19 | 北京领邦智能装备股份公司 | Lens assembly, imaging device, detection device, and detection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120620 Termination date: 20161104 |