CN104345519A - Light intensity regulating mechanism for coaxially driven camera - Google Patents
Light intensity regulating mechanism for coaxially driven camera Download PDFInfo
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- CN104345519A CN104345519A CN201310322437.2A CN201310322437A CN104345519A CN 104345519 A CN104345519 A CN 104345519A CN 201310322437 A CN201310322437 A CN 201310322437A CN 104345519 A CN104345519 A CN 104345519A
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- light intensity
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- camera lens
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Abstract
The invention belongs to the technical field of measurement and control, and particularly discloses a light intensity regulating mechanism for a coaxially driven camera. The light intensity regulating mechanism comprises a camera, a lens and a motor. The lens is arranged in the rotor of the motor. The front end of the lens is provided with a polarizing sheet sleeve which is elastically connected with the motor. The polarizing sheet sleeve is internally provided with a front polarizing sheet and a polarizing sheet pressing circle. The neck part of the camera is provided with a rear polarizing sheet and an opening locking ring. The polarizing sheet sleeve, the front polarizing sheet, the rear polarizing sheet, the camera, the optical axis of the lens and the revolving shaft of the motor are coaxial. Double polarizing sheets are adopted to regulate light intensity entering into the camera, and the two polarizing sheets are superposed and a light intensity signal finally entering into the camera is obtained so that a constant light intensity image which is uniform in light intensity distribution and stable in image grey value is obtained.
Description
Technical field
The invention belongs to observation and control technology field, being specifically related to a kind of for regulating the light intensity regulating mechanism of camera image gray-scale value in Digital Photogrammetric System.
Background technology
In machine vision and photogrammetric field, camera has been the front end sensors of measurement, and under some specific environments, target background exists larger light intensity fluctuation, and this is for measuring being a very large disturbing factor.In order to enable stabilized intensity normally obtain in the range of light intensity of unique point at a camera, need to adjust in real time background light intensity, the image intensity value that collected by camera is arrived one more among a small circle in change, successive image process, to resolve.
At present, the main method that camera light intensity parameter regulates has: change the adjustment of camera lens aperture; Change the adjustment of camera exposure time; Add variable intensity attenuator in the optical path; Adopt electric regulator solution wafer.Above method can both regulate camera light intensity in different application field.The method changing camera lens aperture is adopted to be a kind of conventional method, but change lens aperture and can change other parameter of camera lens simultaneously, the change of lens parameters can bring the change of Digital Photogrammetric System model, and therefore this method is a kind of worthless method photogrammetric field; The change camera exposure time also can regulate the image intensity value that camera obtains, but under real-time measuring condition, camera exposure cannot be accomplished in real time; Add variable intensity attenuator in the optical path and also can reach the object that adjustment enters camera light intensity.
The general form adding attenuator in the optical path has two kinds: continous way attenuator and graded attenuator.Continous way attenuator can provide continuous print light intensity attenuation, but in whole viewing field of camera, light intensity attenuation is uneven; Adopt graded attenuator can solve the uneven problem of viewing field of camera light distribution, but be the continuous decay that gradient decay can not accomplish light intensity due to what adopt, obtain higher sampling density, the quantity that not only can increase attenuator also can make adjusting mechanism very large, can bring comparatively large time delay when light intensity changes greatly to control system.The advantage of electric adjustable liquid crystal display sheet mode is adopted to be that system does not have physical construction, by to LCD panel biasing to change its extinction coefficient, and then change projection light intensity, but its shortcoming is that not only expensive but also its bore can not be accomplished very large, can not meet the requirement of photogrammetric field Large visual angle.
Summary of the invention
The object of the present invention is to provide a kind of coaxial drive camera light intensity regulating mechanism, can to solve in prior art object brightness in the photogrammetric camera course of work has problem compared with macrorelief change,
Technical scheme of the present invention is as follows:
A kind of coaxial drive camera light intensity regulating mechanism, it comprises camera, camera lens and motor, the optical axis of described camera lens and the revolving shaft of motor coaxial, camera lens is positioned at the rotor of motor, described camera lens front end is provided with polaroid cover, this polaroid cover is connected with motor elasticity, is provided with front polaroid and polaroid trim ring in described polaroid cover; Described camera neck is provided with rear polarizer and the opening retaining ring for compressing rear polarizer; The front side of described camera adapter ring is provided with camera lens switching set collar, is provided with camera lens switching loose collar on rear side of described camera lens; Described camera lens switching set collar to be threaded camera lens switching loose collar by focusing outward; The optical axis of described polaroid cover, front polaroid, rear polarizer, camera, camera lens and the revolving shaft of motor coaxial.
In above-mentioned a kind of coaxial drive camera light intensity regulating mechanism: described polaroid cover is ladder tubular structure, and the end face that it is connected with motor is processed with along the circumferential direction equally distributed Elastic Teeth.
In above-mentioned a kind of coaxial drive camera light intensity regulating mechanism: described motor is located in the electric machine support of tubular, and the stator of motor is fixed in electric machine support; Described electric machine support is mounted by means of screws with camera holder, in camera holder, camera is installed.
In above-mentioned a kind of coaxial drive camera light intensity regulating mechanism: described Elastic Teeth and opening retaining ring adopt resilient material to make.
In above-mentioned a kind of coaxial drive camera light intensity regulating mechanism: described polaroid trim ring and polaroid cover are threaded connection, and opening retaining ring is threaded with the adapter ring of camera.
Remarkable result of the present invention is: owing to adopting dual-polarization sheet to regulate the light intensity entering camera, two polaroids carry out superposing the light intensity signal finally being entered camera, thus it is even to obtain light distribution, the permanent plot of light intensity picture of gradation of image value stabilization;
The elasticity of Elastic Teeth connects, and realizes the fast assembling-disassembling of the front polaroid of above-mentioned polaroid cover and inside, ensure that right alignment and the verticality of structure installment preferably, make photogrammetric resultant error less.
Owing to adopting flexible opening retaining ring rear polarizer to compress further, and adapt to the inwall size structure of camera adapter ring, ensured the reliable installation of rear polarizer, the reliability of whole adjustment structure is improved.
Accompanying drawing explanation
Fig. 1 is coaxial drive camera light intensity regulating structural scheme of mechanism;
In figure: 1. camera lens; 2. camera; 3. motor; 4. electric machine support; 5. camera holder; 6. polaroid cover; 7. camera lens switching set collar; 8. camera lens switching loose collar; 9. polaroid trim ring; 10. polaroid before; 11. rear polarizers; 12. opening retaining rings.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Figure 1, electric machine support 4 is cylindric, the stator of motor 3 is fixedly mounted in electric machine support 4 by screw, make polaroid overlap 6 by the mounting hole of above-mentioned electric machine support 4 to be connected with motor 3 elasticity, described polaroid cover 6 is ladder tubular structure, the end face that it is connected with motor 3 is processed with along the circumferential direction equally distributed Elastic Teeth, because Elastic Teeth adopts resilient material to make, makes polaroid overlap 6 and be connected with the rotor hole elasticity of motor 3.Because above-mentioned polaroid cover 6 is ladder tubular structure, its inwall is stepped, is provided with front polaroid 10, and is compressed by polaroid 10 before above-mentioned by polaroid trim ring 9.Above-mentioned polaroid trim ring 9 overlaps 6 by screw thread and polaroid and is connected, and is compressed by front polaroid 10 simultaneously.
Described electric machine support 4 is mounted by means of screws with camera holder 5, and in the middle of the present embodiment, camera holder 5 is round outside but spuare inside cylindrical structure, and inner installation camera 2, camera 2 is fixedly mounted in camera holder 5 by screw.
The adapter ring inwall of camera 2 is processed with a circle boss, by boss by rear polarizer 11 location and installation at camera 2 neck, by flexible opening retaining ring 12, above-mentioned rear polarizer 11 is compressed location further again, above-mentioned opening retaining ring 12 is arranged on by screw thread in the adapter ring of camera 2, owing to adopting resilient material, be applicable to the planform of camera 2 adapter ring preferably.
The front side of camera 2 adapter ring is provided with camera lens switching set collar 7 by screw, and camera lens switching set collar 7 is outer is provided with camera lens switching loose collar 8 by focusing screw thread, and camera lens 1 is installed by screw thread in camera lens switching loose collar 8 front end.Above-mentioned camera lens 1 is positioned at the rotor of motor 3, and the revolving shaft of above-mentioned polaroid cover 6, front polaroid 10, rear polarizer 11, camera 2, the optical axis of camera lens 1 and motor 3 is coaxial.
The adjustment of camera light intensity is realized by such as under type: the rotor of motor 3 rotates along rotary axis system, because the rotor hole elasticity of the motor 3 of polaroid cover 6 connects, therefore polaroid cover 6 is also followed rotor and is turned round together, be fixed on polaroid 10 before on polaroid cover 6 by polaroid trim ring 9 also to follow rotor and turn round together, the light entering camera lens 1 is thus modulated by the rotation of polaroid, obtain the polarized light with rotating change, polarized light is by arriving rear polarizer 11 after camera lens, rear polarizer 11 carries out analyzing to playing light to the rear, two polaroids carry out superposing the light intensity signal finally being entered camera, when two polaroids do not exist relatively rotate time, the light intensity signal of superposition is constant, when existence relatively rotates, the light intensity signal of superposition changes with relative rotation, light and shade change twice in each rotation period.
Utilize this governor motion to carry out actual measurement, when measurement target gray-scale value carries out (10 ~ 150) change, make image intensity value be stabilized in the permanent plot of light intensity picture of 70.
Claims (5)
1. a coaxial drive camera light intensity regulating mechanism, it comprises camera (2), camera lens (1) and motor (3), the optical axis of described camera lens (1) and the revolving shaft of motor (3) coaxial, camera lens (1) is positioned at the rotor of motor (3), it is characterized in that: described camera lens (1) front end is provided with polaroid cover (6), this polaroid cover (6) is connected with motor (3) elasticity, is provided with front polaroid (10) and polaroid trim ring (9) in described polaroid cover (6); Described camera (2) neck is provided with rear polarizer (11) and the opening retaining ring (12) for compressing rear polarizer (11); The front side of described camera (2) adapter ring is provided with camera lens switching set collar (7), and described camera lens (1) rear side is provided with camera lens switching loose collar (8); Described camera lens switching set collar (7) to be threaded camera lens switching loose collar (8) by focusing outward; The optical axis of described polaroid cover (6), front polaroid (10), rear polarizer (11), camera (2), camera lens (1) and the revolving shaft of motor (3) coaxial.
2. a kind of coaxial drive camera light intensity regulating mechanism as claimed in claim 1, is characterized in that: described polaroid cover (6) is ladder tubular structure, and the end face that it is connected with motor (3) is processed with along the circumferential direction equally distributed Elastic Teeth.
3. a kind of coaxial drive camera light intensity regulating mechanism as claimed in claim 1, is characterized in that: described motor (3) is located in the electric machine support (4) of tubular, and the stator of motor (3) is fixed in electric machine support (4); Described electric machine support (4) is mounted by means of screws with camera holder (5), in camera holder (5), camera (2) is installed.
4. a kind of coaxial drive camera light intensity regulating mechanism as claimed in claim 1, is characterized in that: described Elastic Teeth and opening retaining ring (12) adopt resilient material to make.
5. a kind of coaxial drive camera light intensity regulating mechanism as claimed in claim 1, is characterized in that: described polaroid trim ring (9) and polaroid cover (6) are threaded connection, and opening retaining ring (12) is threaded with the adapter ring of camera (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310322437.2A CN104345519B (en) | 2013-07-29 | 2013-07-29 | Light intensity regulating mechanism for coaxially driven camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310322437.2A CN104345519B (en) | 2013-07-29 | 2013-07-29 | Light intensity regulating mechanism for coaxially driven camera |
Publications (2)
| Publication Number | Publication Date |
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| CN104345519A true CN104345519A (en) | 2015-02-11 |
| CN104345519B CN104345519B (en) | 2017-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310322437.2A Active CN104345519B (en) | 2013-07-29 | 2013-07-29 | Light intensity regulating mechanism for coaxially driven camera |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017088601A1 (en) * | 2015-11-26 | 2017-06-01 | 努比亚技术有限公司 | Camera module and mobile terminal |
Citations (6)
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| JPH05341166A (en) * | 1992-06-12 | 1993-12-24 | Canon Inc | Lens-barrel |
| JP2006208714A (en) * | 2005-01-27 | 2006-08-10 | Sony Corp | Imaging apparatus |
| JP2006215120A (en) * | 2005-02-01 | 2006-08-17 | Sanyo Electric Co Ltd | Illuminator and projection type video display device |
| CN101676764A (en) * | 2008-09-17 | 2010-03-24 | 日本电气株式会社 | Method and device for adjusting luminance of light transmitted through glasses |
| CN201780518U (en) * | 2010-08-10 | 2011-03-30 | 北京工业大学 | Light dimming system based on polarization principle |
| CN203376539U (en) * | 2013-07-29 | 2014-01-01 | 北京航天计量测试技术研究所 | Coaxial drive camera light-intensity adjusting mechanism |
-
2013
- 2013-07-29 CN CN201310322437.2A patent/CN104345519B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05341166A (en) * | 1992-06-12 | 1993-12-24 | Canon Inc | Lens-barrel |
| JP2006208714A (en) * | 2005-01-27 | 2006-08-10 | Sony Corp | Imaging apparatus |
| JP2006215120A (en) * | 2005-02-01 | 2006-08-17 | Sanyo Electric Co Ltd | Illuminator and projection type video display device |
| CN101676764A (en) * | 2008-09-17 | 2010-03-24 | 日本电气株式会社 | Method and device for adjusting luminance of light transmitted through glasses |
| CN201780518U (en) * | 2010-08-10 | 2011-03-30 | 北京工业大学 | Light dimming system based on polarization principle |
| CN203376539U (en) * | 2013-07-29 | 2014-01-01 | 北京航天计量测试技术研究所 | Coaxial drive camera light-intensity adjusting mechanism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017088601A1 (en) * | 2015-11-26 | 2017-06-01 | 努比亚技术有限公司 | Camera module and mobile terminal |
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| CN104345519B (en) | 2017-05-17 |
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