CN204314056U - A kind of focimeter - Google Patents
A kind of focimeter Download PDFInfo
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- CN204314056U CN204314056U CN201420803242.XU CN201420803242U CN204314056U CN 204314056 U CN204314056 U CN 204314056U CN 201420803242 U CN201420803242 U CN 201420803242U CN 204314056 U CN204314056 U CN 204314056U
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Abstract
The utility model discloses a kind of focimeter, comprise base, tested camera lens, bitubular parallel light tube, light source and display screen, base is provided with guide rail, guide rail there is the slide block that can move horizontally along guide rail, the sidewall of guide rail is provided with for regulating the focusing of described slide block movement to take turns, slide block is connected with rotating shaft, rotating shaft is rotated relative to described slide block, rotating shaft is fixedly connected with swinging block, swinging block is connected with described tested camera lens, the sidewall of swinging block is provided with the focal length minitrim wheel for regulating tested lens moving, base is also provided with tube structure, the top of tube structure is camera, the bottom of tube structure is semi-transparent semi-reflecting microscope base, bitubular parallel light tube is equipped with the graticule of two-wire and single line respectively, the light that light source place sends, through bitubular parallel light tube, the picture display formed after tested lens focus on a display screen, the back side of tested camera lens is provided with plane mirror, the picture formed after tested lens focus is projected to camera through semi-transparent semi-reflecting lens by plane mirror.
Description
Technical field
The utility model relates to a kind of focimeter.
Background technology
Optical lens and system are widely used as the converter of image or energy.The amplification of transfer process, focussing force depends primarily on the focal length of optical system.Up to now, the many employings of the method for focal length measurement are based on the magnification method of geometric optical theory.Utilize the visual focusing of eyepiece mircrometer gauge, optical bench realizes.Accuracy of measurement can reach 0.3% under ideal conditions.But owing to there is parallax in measuring process, sighting mark error, reading error and people poor, particularly magnification ratio juris is based on by the long distance of short baseline determination, unavoidably will introduce suitable error.Especially all the more so when measuring longer focal length.The result recorded and repeatability often do not reach this precision.Therefore the exploitation of the focimeter that a kind of focometry precision is higher is necessary.
Utility model content
Utility model object: technical problem to be solved in the utility model is to provide the higher focimeter of a kind of focometry precision.
Utility model content: for solving the problems of the technologies described above, the technological means that the utility model adopts is:
A kind of focimeter, comprise base, tested camera lens, bitubular parallel light tube, light source, and display screen, described base is provided with guide rail, described guide rail there is the slide block that can move horizontally along guide rail, the sidewall of described guide rail is provided with for regulating the focusing of described slide block movement to take turns, described slide block is connected with rotating shaft, described rotating shaft is fixedly connected with swinging block, described swinging block is connected with described tested camera lens, the sidewall of described swinging block is provided with the focal length minitrim wheel for regulating tested lens moving, described base is also provided with tube structure, the top of described tube structure is camera, the bottom of described tube structure is semi-transparent semi-reflecting microscope base, described bitubular parallel light tube is equipped with the graticule of two-wire and single line respectively, the light that described light source place sends, through described bitubular parallel light tube, the picture formed after described tested lens focus is presented on described display screen, the back side of described tested camera lens is provided with plane mirror, the picture formed after tested lens focus is projected to camera through described semi-transparent semi-reflecting lens by described plane mirror, and shown by display screen.
Further preferably, this instrument is also provided with the reading window for showing focal length value, and described reading window and described guide rail are disposed in parallel on described base.
Beneficial effect: compared to prior art, focimeter of the present utility model is rational in infrastructure, and the measurement of focusing is more accurate, and the accuracy of measurement of the utility model device focusing can reach 0.1%, improves the measuring accuracy of focal length.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model focimeter;
Wherein, 1 base; 2 guide rails; 3 focusing wheels; 4 slide blocks; 5 reading windows; 6 rotating shafts; 7 swinging blocks; 8 focal length minitrim wheels; 9 plane mirrors; 10 tested camera lenses; 11 display screens; 12 two-wire folder line chart pictures; 13 cameras; 14 bitubular parallel light tubes; 15 light sources; 16 half-mirrors.
Embodiment
Below in conjunction with drawings and Examples; the technical solution of the utility model is described in detail; but the claimed scope of the utility model is not limited to the scope that embodiment represents; therefore all equivalences done according to structure, feature and the principle described in the utility model patent claim change or modify, and are included in the utility model patent claim.
From geometrical optics, the definition of focal length is the distance of optical system principal point to focus.Therefore the position of Accurate Measurement principal point and focus is the key of Accurate Measurement focal length.One of characteristic of principal point is that when swinging camera lens centered by principle point location, camera lens focus can not change.By special collimation parallel light tube, accurate principal point tilting mechanism, sensitive electronic display system and grating measuring length system, make Accurate Measurement focal length become possibility.
As shown in Figure 1, focimeter of the present utility model, comprise base 1, tested camera lens 10, bitubular parallel light tube 14, light source 15 and display screen 11, base 1 is provided with guide rail 2, guide rail 2 is provided with the slide block 4 that can move horizontally along guide rail 2, the sidewall of guide rail 2 is provided with the focusing wheel 3 for adjusting slider 4 movement, slide block 4 is connected with rotating shaft 6, rotating shaft 6 is fixedly connected with swinging block 7, swinging block 7 is connected with tested camera lens 10, the sidewall of swinging block 7 is provided with the focal length minitrim wheel 8 for regulating the movement of tested camera lens 10, swinging block 7 is swung together with tested camera lens 10 and focuses simultaneously, accurately can find principal point and the focus of camera lens.With optical grating ruler measurement principal point to the distance of focus, the focal length value of camera lens can be drawn at reading window 5.In order to make principal point and focus registration, also on base 1, be provided with tube structure 17, the top of tube structure 17 is camera 13, and the bottom of tube structure 17 is semi-transparent semi-reflecting microscope base 16 and the bitubular parallel light tube 14 that two-wire and single line graticule are housed respectively.The light that light source 15 sends, through bitubular parallel light tube 14, what after tested camera lens 10 focuses on, form two-wire folder single line is presented on display screen 11 as 12, as shown in label in Fig. 1 12, plane mirror 9 is provided with after tested camera lens 10, what tested camera lens 10 was focused on rear formation by plane mirror 9 is back to display screen 11 as 12 through semi-transparent semi-reflecting microscope base 16, to improve the precision of focusing.
Claims (2)
1. a focimeter, it is characterized in that: comprise base, tested camera lens, bitubular parallel light tube, light source, and display screen, described base is provided with guide rail, described guide rail there is the slide block that can move horizontally along guide rail, the sidewall of described guide rail is provided with for regulating the focusing of described slide block movement to take turns, described slide block is connected with rotating shaft, described rotating shaft is fixedly connected with swinging block, described swinging block is connected with described tested camera lens, the sidewall of described swinging block is provided with the focal length minitrim wheel for regulating tested lens moving, described base is also provided with tube structure, the top of described tube structure is camera, the bottom of described tube structure is semi-transparent semi-reflecting microscope base, described bitubular parallel light tube is equipped with the graticule of two-wire and single line respectively, the light that described light source place sends, through described bitubular parallel light tube, the picture formed after described tested lens focus is presented on described display screen, the back side of described tested camera lens is provided with plane mirror, the picture formed after tested lens focus is projected to camera through described semi-transparent semi-reflecting lens by described plane mirror, and shown by display screen.
2. according to the said focimeter of claim 1, also comprise the reading window that can show focal length, described reading window and described guide rail are disposed in parallel on described base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420803242.XU CN204314056U (en) | 2014-12-18 | 2014-12-18 | A kind of focimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420803242.XU CN204314056U (en) | 2014-12-18 | 2014-12-18 | A kind of focimeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204314056U true CN204314056U (en) | 2015-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420803242.XU Active CN204314056U (en) | 2014-12-18 | 2014-12-18 | A kind of focimeter |
Country Status (1)
| Country | Link |
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| CN (1) | CN204314056U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203304A (en) * | 2015-10-09 | 2015-12-30 | 茂莱（南京）仪器有限公司 | Optical bench for measuring focus length through magnification method |
| CN105928687A (en) * | 2016-04-15 | 2016-09-07 | 舜宇光学(中山)有限公司 | Testing tool and method suitable for BFL (Back Focal Length) drift distance of lens |
| CN109186961A (en) * | 2018-10-16 | 2019-01-11 | 天津中精微仪器设备有限公司 | A kind of lens focus measuring device |
| CN110207725A (en) * | 2019-07-05 | 2019-09-06 | 中国人民解放军海军航空大学青岛校区 | Guide rail sliding chute formula lubber line calibrating installation |
-
2014
- 2014-12-18 CN CN201420803242.XU patent/CN204314056U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203304A (en) * | 2015-10-09 | 2015-12-30 | 茂莱（南京）仪器有限公司 | Optical bench for measuring focus length through magnification method |
| CN105928687A (en) * | 2016-04-15 | 2016-09-07 | 舜宇光学(中山)有限公司 | Testing tool and method suitable for BFL (Back Focal Length) drift distance of lens |
| CN109186961A (en) * | 2018-10-16 | 2019-01-11 | 天津中精微仪器设备有限公司 | A kind of lens focus measuring device |
| CN110207725A (en) * | 2019-07-05 | 2019-09-06 | 中国人民解放军海军航空大学青岛校区 | Guide rail sliding chute formula lubber line calibrating installation |
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