CN102564736A - Device and method for measuring focal length of lens - Google Patents
Device and method for measuring focal length of lens Download PDFInfo
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- CN102564736A CN102564736A CN2011102739175A CN201110273917A CN102564736A CN 102564736 A CN102564736 A CN 102564736A CN 2011102739175 A CN2011102739175 A CN 2011102739175A CN 201110273917 A CN201110273917 A CN 201110273917A CN 102564736 A CN102564736 A CN 102564736A
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Abstract
The invention relates to a device for measuring the focal length of a lens. The device comprises a light source module, a reflection module and a receiving module. The lens to be measured and the reflection module are sequentially arranged on an output light path of the light source module. The emergent surface of the light source module and the receiving surface of the receiving module are coplanar. The output light of the light source module is transmitted and reflected by the lens to be measured and the reflection module to form a converged beam which is received by the receiving module. The invention also relates to a method for measuring the focal length of the lens on the basis of the device for measuring the focal length of the lens. According to the device and the method for measuring the focal length of the lens, a beam expander group for the conventional method is cancelled, so that troubles and errors in the regulation of the beam expander group are avoided, and the device and the method are convenient to operate; and due to additional arrangement of the reflection module, parallel light with high parallelism can be obtained when the focal length is measured, measurement errors caused by the parallelism are greatly reduced, and the measurement accuracy is improved.
Description
Technical field
The present invention relates to the measurement of the focal length of lens, be applicable to the focometry of any wavelength of lens.
Background technology
Conventional measurement is at present: with reference to shown in Figure 1; Light source 1 output laser is through beam-expanding system 2; Become bigbore directional light and shine and converge at certain point thereafter on the lens 3, receive and move forward and backward CCD module 4 with CCD module (charge coupled cell) 4, the minimum point of picture point is focus; Measure 3 on this point and lens apart from f, be the focal length of these lens.
But the laser furnishing directional light incident lens 3 that will pass through beam-expanding system 2 are the very things of difficulty, do not have certain criteria to judge whether incident laser is parallel, and its collimation directly has influence on the accuracy of lens 3 focometries.This brings great error for the measurement of the focal length of lens.
Summary of the invention
Fundamental purpose of the present invention provides a kind of device and method that is used for the measurement of Lens focal length, is intended to reduce the error that the focal length of lens is measured, and has improved accuracy greatly, and step simplifies the operation.
A kind of device that is used for the measurement of Lens focal length provided by the invention; Comprise light source module, reflecting module and receiver module; Wherein, set gradually lens to be measured and said reflecting module on the output light path of said light source module, the receiving plane coplane of the exiting surface of said light source module and said receiver module; The output light of light source module becomes convergent beam after passing through of said lens to be measured and said reflecting module is anti-, and is received by said receiver module.
Preferably, out of plumb between the reflecting surface of the optical axis of said incident light and said reflecting module.
Preferably, the angle between the reflecting surface of the optical axis of said incident light and said reflecting module is 3 to 5 degree.
Preferably, the said device that is used for the measurement of Lens focal length also comprises judge module, is used to judge the size of hot spot on the said receiver module.
Preferably, the said device that is used for the measurement of Lens focal length also comprises measurement module, is used to measure the distance of receiver module to said lens to be measured.
Preferably, said reflecting module comprises plane mirror.
Preferably, said receiver module comprises the CCD module.
Preferably, the center of the output light transmission lens to be measured of said light source module.
The invention still further relates to a kind of method of measurement of Lens focal length; The said device that is used for the measurement of Lens focal length comprises light source module, reflecting module and receiver module, wherein; Set gradually lens to be measured and said reflecting module on the output light path of said light source module; The receiving plane coplane of the exiting surface of said light source module and said receiver module, the output light of light source module becomes convergent beam after passing through of said lens to be measured and said reflecting module is anti-, and is received by said receiver module;
Said measuring method comprises:
The first step: adjust light source module, make the emergent light directive lens to be measured of said light source module;
Second step: adjustment reflecting module and/or receiver module, the emergent light that makes said light source module is through the reflection of the refraction first time of lens to be measured, reflecting module and on said receiver module, form hot spot after the refraction second time of lens to be measured;
The 3rd step: adjust the distance between said light source module, receiver module and the lens to be measured; The hot spot that on said receiver module, is appeared hour; Said measurement module is measured the distance of said receiver module to said lens to be measured, and this distance is the focal length of said lens to be measured.
Preferably, comprise also specifically said judge module judges whether the hot spot that is appeared on the said receiver module reaches minimum state in said the 3rd step.
A kind of apparatus and method that are used for the measurement of Lens focal length of the present invention have been saved the used beam expanding lens group of classic method; Thereby the trouble and the error of beam expanding lens group have been avoided regulating; Make operation easier, increased the setting of reflecting module, when focal length measurement, can obtain the very high directional light of the depth of parallelism; Significantly reduced because of depth of parallelism errors caused, improved the accuracy of measuring.
Description of drawings
Fig. 1 is the apparatus structure synoptic diagram of measurement of Lens focal length in the prior art.
Fig. 2 is used for the structural representation of an embodiment of device of measurement of Lens focal length for the present invention.
Fig. 3 is the process flow diagram of an embodiment of method of measurement of Lens focal length of the present invention.
The realization of the object of the invention, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
Embodiment
Do further explanation below in conjunction with accompanying drawing and specific embodiment with regard to technical scheme of the present invention.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
With reference to Fig. 2; Showed a kind of device that is used for the measurement of Lens focal length of the present invention, comprised light source module 10, reflecting module 20 and receiver module 30, above-mentioned light source module 10 is used for output beam; On the light path of light source module 10 outputs, set gradually lens 40 to be measured and above-mentioned reflecting module 20; Wherein, the receiving plane coplane of the exiting surface of above-mentioned light source module 10 and above-mentioned receiver module 30, above-mentioned receiver module 30 can translation in this plane.The output light of above-mentioned light source module 10 is directive reflecting module 20 (shown in solid line among the figure) after lens 40 to be measured refraction for the first time; Above-mentioned reflecting module 20 reflects above-mentioned light; After the refraction for the second time of above-mentioned lens 40 to be measured, form convergent beam (shown in dotted line among the figure) again; And, on above-mentioned receiver module 30, form hot spot by above-mentioned receiver module 30 receptions.Adjust the distance between above-mentioned light source module 10, receiver module 30 and the above-mentioned lens to be measured 40 during use; Hot spot on the receiving plane that is presented on above-mentioned receiver module 30 hour, above-mentioned lens 40 to be measured are the focal length of above-mentioned lens to be measured 40 to the distance of above-mentioned receiver module 30.
Separate in order to make through the preceding light (shown in dotted line among the figure) of above-mentioned reflecting module 20 light reflected (shown in solid line among the figure) and reflection; Out of plumb between the reflecting surface of the optical axis of above-mentioned incident light and said reflecting module 20, and the angle between the reflecting surface of the optical axis of above-mentioned incident light and said reflecting module 20 is 3 to 5 degree.
Also comprise the judge module 50 that is used to judge spot size on the above-mentioned receiver module 30 in the present embodiment.Above-mentioned judge module 50 can judge whether the hot spot that is appeared on the above-mentioned receiver module 30 reaches minimum state, so that measure the focal length of above-mentioned lens to be measured 40.
Also comprise in the present embodiment and be used to measure the measurement module 60 of above-mentioned receiver module 30 receiving planes to the distance between the above-mentioned lens 40 to be measured; When hot spot that above-mentioned receiver module 30 appeared hour; Above-mentioned measurement module 60 is measured above-mentioned receiver module 30 receiving planes to the distance between the above-mentioned lens 40 to be measured, and this distance is the focal length of above-mentioned lens to be measured 40.
The distance of adjusting in the present embodiment between above-mentioned light source module 10, receiver module 30 and the lens to be measured 40 can be a manual adjustments; Also can regulate through the mechanical driving device (not shown); Mechanical driving device is connected with above-mentioned judge module 50; Above-mentioned mechanical driving device is adjusted the distance between above-mentioned light source module 10, receiver module 30 and the lens to be measured 40; When above-mentioned judge module 50 judges that the hot spot that appeared on the above-mentioned receiver module 30 when reaching minimum state, sends a halt instruction to above-mentioned mechanical driving device, above-mentioned mechanical driving device stop motion.
Above-mentioned reflecting module 20 is preferably plane mirror.
Above-mentioned receiver module 30 is preferably the CCD module.
The size of above-mentioned light source module 10 exiting surfaces is preferably circle, and the radius of circular exiting surface is preferably micron dimension.
The invention still further relates to method based on the measurement of Lens focal length of said apparatus, with reference to Fig. 3, the process flow diagram of an embodiment of method of measurement of Lens focal length of the present invention.Above-mentioned measuring method comprises:
The first step: adjust the rising angle of above-mentioned light source module 10, make the emergent light directive lens 40 to be measured of above-mentioned light source module 10, and this emergent light is through the photocentre of above-mentioned lens 40 to be measured;
Second step: adjust the reflection angle (being the angle between the optical axis of reflecting surface and incident light of reflecting module 20) of above-mentioned reflecting module 20 and/or adjust the locus of above-mentioned receiver module 30, the emergent light that makes above-mentioned light source module 10 through the refraction first time of above-mentioned lens 40 to be measured, again through the reflection of above-mentioned reflecting module 20, after on above-mentioned receiver module 30, form hot spot after reflecting the second time of above-mentioned lens to be measured 40;
The 3rd step: adjust the distance between above-mentioned light source module 10, receiver module 30 and the lens to be measured 40; The hot spot that on above-mentioned receiver module 30, is appeared hour; Above-mentioned measurement module 60 is measured the distance of above-mentioned receiver module 30 to above-mentioned lens 40 to be measured, and this distance is the focal length of above-mentioned lens to be measured 40.
In the present embodiment; Specifically also comprise in the 3rd step of said method; In the process of the distance between above-mentioned receiver module 30 of adjustment and lens to be measured 40; Above-mentioned judge module 50 judges whether the hot spot that is appeared on the above-mentioned receiver module 30 reaches minimum state, when above-mentioned judge module 50 confirms that the hot spot that is appeared on the above-mentioned receiver module 30 reaches minimum state, and the relative position of fixing above-mentioned receiver module 30 and lens 40 to be measured; Above-mentioned measurement module 60 is measured the distance of above-mentioned receiver module 30 to above-mentioned lens 40 to be measured, and this distance is the focal length of above-mentioned lens to be measured 40.The receiving plane of the exiting surface of said light source module 10 and said receiver module 30 is in course of adjustment and remains coplane.
Above-mentioned reflecting module 20 is preferably plane mirror.
Above-mentioned receiver module 30 is preferably the CCD module.
The size of above-mentioned light source module 10 exiting surfaces is preferably circle, and the radius of circular exiting surface is preferably micron dimension.
Its principle of work is: the light that is sent when time on the focal plane of pointolite at lens can obtain directional light after the lens refraction.According to the reversibility of light path, a branch of directional light can be focused on the focal plane after the lens refraction.
The exiting surface of light source module 10 and the receiving plane of receiver module 30 are placed in the plane, and light source module 10 equates with the distance of receiver module 30 to lens 40 to be measured to the distance of lens 40 to be measured.Because the exiting surface of light source module 10 is a micron dimension, therefore can regard light source module 10 as pointolite.When the exiting surface of light source module 10 is just on the focal plane of lens 40 to be measured, the emergent light directive of above-mentioned light source module 10 lens 40 to be measured.This emergent light needed the photocentre of lens 40 to be measured.
Above-mentioned emergent light can obtain the very high directional light of the depth of parallelism after the refraction first time of lens 40 to be measured.This directional light is through reflecting module 20 reflections, and this reflecting module 20 is a plane mirror, and purpose is in order to guarantee that light reflected still is directional light.The reflecting surface of reflecting module 20 should form angle with the optical axis of incident light, and this angle is about 3 to 5 degree, and this angle is can not return along former road for light reflected, staggers each other.Above-mentioned parallel rays after reflecting module 20 reflections is after the refraction second time of lens 40 to be measured; Just be focused on the receiver module 30; If the hot spot of being accepted on the receiver module 30 this moment is minimum, the same plane at the receiving plane place of the exiting surface of light source module 10 and receiver module 30 overlaps with the focal plane of lens 40 to be measured just.So, can confirm that the receiving plane (or exiting surface of light source module 10) of receiver module 30 arrives the focal length of the distance of 40 on lens to be measured for these lens 40 to be measured.
When hot spot that receiver module 30 received is not hour; Explain that the exiting surface of light source module 10 this moment and the receiving plane of receiver module 30 do not overlap with the focal plane of lens 40 to be measured; Has only the distance between adjustment receiver module 30 and light source module 10 common planes, place and the lens to be measured 40; Up to hot spot that receiver module 30 received hour; The receiving plane of receiver module 30 and the exiting surface of light source module just overlap with the focal plane of lens 40 to be measured, confirm that receiver module 30 (or light source module 10) is to the focal length of the distance between the lens 40 to be measured for these lens 40 to be measured.
A kind of apparatus and method that are used for the measurement of Lens focal length of the present invention have been saved the used beam expanding lens group of classic method; Thereby the trouble and the error of beam expanding lens group have been avoided regulating; Make operation easier, increased the setting of reflecting module, when focal length measurement, can obtain the very high directional light of the depth of parallelism; Significantly reduced because of depth of parallelism errors caused, improved the accuracy of measuring.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure transformation that utilizes instructions of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (11)
1. device that is used for the measurement of Lens focal length; It is characterized in that, comprise light source module, reflecting module and receiver module, wherein; Set gradually lens to be measured and said reflecting module on the output light path of said light source module; The receiving plane coplane of the exiting surface of said light source module and said receiver module, the output light of light source module become convergent beam through behind said lens to be measured, said reflecting module and the said lens to be measured in regular turn, and are received by said receiver module.
2. the device that is used for the measurement of Lens focal length according to claim 1 is characterized in that, out of plumb between the optical axis of said incident light and the reflecting surface of said reflecting module.
3. the device that is used for the measurement of Lens focal length according to claim 2 is characterized in that, the angle between the optical axis of said incident light and the reflecting surface of said reflecting module is 3 to 5 degree.
4. the device that is used for the measurement of Lens focal length according to claim 3 is characterized in that, also comprises judge module, is used to judge the size of hot spot on the said receiver module.
5. the device that is used for the measurement of Lens focal length according to claim 4 is characterized in that, also comprises measurement module, is used to measure the distance of receiver module to said lens to be measured.
6. according to each described device that is used for the measurement of Lens focal length in the claim 1 to 3, it is characterized in that said reflecting module comprises plane mirror.
7. according to the described device that is used for the measurement of Lens focal length of claim 1 to 4, it is characterized in that said receiver module comprises the CCD module.
8. the device that is used for the measurement of Lens focal length according to claim 2 is characterized in that, the center of the output light transmission lens to be measured of said light source module.
9. the method for a measurement of Lens focal length; It is characterized in that; The said device that is used for the measurement of Lens focal length comprises light source module, reflecting module and receiver module, wherein; Set gradually lens to be measured and said reflecting module on the output light path of said light source module; The receiving plane coplane of the exiting surface of said light source module and said receiver module, the output light of light source module become convergent beam through behind said lens to be measured, said reflecting module and the said lens to be measured in regular turn, and are received by said receiver module;
Said measuring method comprises:
The first step: adjust light source module, make the emergent light directive lens to be measured of said light source module;
Second step: adjustment reflecting module and/or receiver module, the emergent light that makes said light source module is through the reflection of the refraction first time of lens to be measured, reflecting module and on said receiver module, form hot spot after the refraction second time of lens to be measured;
The 3rd step: adjust the distance between said light source module, receiver module and the lens to be measured; The hot spot that on said receiver module, is appeared hour; Said measurement module is measured the distance of said receiver module to said lens to be measured, and this distance is the focal length of said lens to be measured.
10. the method for measurement of Lens focal length according to claim 9 is characterized in that, comprises also specifically said judge module judges whether the hot spot that is appeared on the said receiver module reaches minimum state in said the 3rd step.
11. the method for measurement of Lens focal length according to claim 9 is characterized in that, the exiting surface of said light source module and the receiving plane of said receiver module are in course of adjustment and keep coplane always.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102739175A CN102564736A (en) | 2011-09-15 | 2011-09-15 | Device and method for measuring focal length of lens |
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| CN2011102739175A CN102564736A (en) | 2011-09-15 | 2011-09-15 | Device and method for measuring focal length of lens |
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| CN102564736A true CN102564736A (en) | 2012-07-11 |
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| CN2011102739175A Pending CN102564736A (en) | 2011-09-15 | 2011-09-15 | Device and method for measuring focal length of lens |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103630337A (en) * | 2013-12-09 | 2014-03-12 | 青岛海信宽带多媒体技术有限公司 | Device and method for measuring front-end focal length of lens |
| CN104165758A (en) * | 2014-08-29 | 2014-11-26 | 南京理工大学 | Lens focal length measuring device and method based on Fizeau interferomenter |
| CN105067229A (en) * | 2015-09-06 | 2015-11-18 | 中国工程物理研究院激光聚变研究中心 | Grating ruler three-probe focal length measurement device and measurement method based on combined lens method |
| CN110307963A (en) * | 2019-08-08 | 2019-10-08 | 苏州维纳仪器有限责任公司 | The method for detecting any wavelength focal length of transmission type optical system |
| CN112781839A (en) * | 2020-12-30 | 2021-05-11 | 森思泰克河北科技有限公司 | Lens performance test system |
| CN113588214A (en) * | 2021-06-30 | 2021-11-02 | 歌尔光学科技有限公司 | System for testing focal length |
| CN114486186A (en) * | 2021-12-27 | 2022-05-13 | 歌尔股份有限公司 | Detection device and method for effective focal length of lens |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630337A (en) * | 2013-12-09 | 2014-03-12 | 青岛海信宽带多媒体技术有限公司 | Device and method for measuring front-end focal length of lens |
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| CN110307963A (en) * | 2019-08-08 | 2019-10-08 | 苏州维纳仪器有限责任公司 | The method for detecting any wavelength focal length of transmission type optical system |
| CN112781839A (en) * | 2020-12-30 | 2021-05-11 | 森思泰克河北科技有限公司 | Lens performance test system |
| CN113588214A (en) * | 2021-06-30 | 2021-11-02 | 歌尔光学科技有限公司 | System for testing focal length |
| CN114486186A (en) * | 2021-12-27 | 2022-05-13 | 歌尔股份有限公司 | Detection device and method for effective focal length of lens |
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Application publication date: 20120711 |