CN104345519B - Light intensity regulating mechanism for coaxially driven camera - Google Patents
Light intensity regulating mechanism for coaxially driven camera Download PDFInfo
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- CN104345519B CN104345519B CN201310322437.2A CN201310322437A CN104345519B CN 104345519 B CN104345519 B CN 104345519B CN 201310322437 A CN201310322437 A CN 201310322437A CN 104345519 B CN104345519 B CN 104345519B
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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, and in particular to one kind is used to adjust camera image gray scale in Digital Photogrammetric System
The light intensity regulating mechanism of value.
Background technology
In machine vision and photogrammetric field, camera is the front end sensors for completing to measure, under some specific environments,
There is larger light intensity fluctuation in target background, this is a very big interference factor for measurement.In order that stabilized intensity
In the range of light intensity that a camera normally can obtain characteristic point, need to carry out real-time adjustment to background light intensity, adopt camera
The image intensity value for collecting can change in a smaller range, so as to successive image process, resolve.
At present, the main method of camera light intensity parameter regulation has：Change the adjustment of camera lens aperture；When changing camera exposure
Between adjust；Variable intensity attenuator is added in the optical path；Using electric adjustable liquid crystal display piece.Above method can in different application field
It is enough that camera light intensity is adjusted.It is a kind of conventional method using the method for change camera lens aperture, but changes camera lens light
Circle can simultaneously change camera lens other parameters, and the change of lens parameters can bring the change of Digital Photogrammetric System model, therefore this
Method is a kind of worthless method for photogrammetric field；Changing the camera exposure time also can be to the image of camera acquisition
Gray value is adjusted, but under real-time measuring condition, camera exposure cannot be accomplished in real time；Variable intensity is added to decline in the optical path
Subtracting piece can also reach the purpose for being adjusted into camera light intensity.
It is general to add the form of attenuator to have two kinds in the optical path：Continuous way attenuator and graded attenuator.Continuously
Formula attenuator can provide continuous light intensity attenuation, but in whole viewing field of camera, light intensity attenuation is uneven；Using graded
Attenuator can solve the problem that the uneven problem of viewing field of camera light distribution, but can not accomplish light intensity due to using gradient decay
Continuous decay, to obtain higher sampling density, can not only increase the quantity of attenuator can also make adjustment mechanism very big, work as light
Can bring compared with large time delay to control system when changing greatly by force.Advantage using electric adjustable liquid crystal display sheet mode is system without machinery
Structure, by projecting light intensity to change its extinction coefficient, and then change to LCD panel biasing, but it has the disadvantage that not only price is held high
Expensive and its bore can not accomplish very big, it is impossible to meet the requirement of the big visual field in photogrammetric field.
The content of the invention
It is an object of the invention to provide a kind of Driven by Coaxial camera light intensity regulating mechanism, can solve the problem that in prior art and takes the photograph
Object brightness has the problem of larger fluctuations in the shadow measurement camera course of work,
Technical scheme is as follows：
A kind of Driven by Coaxial camera light intensity regulating mechanism, it includes camera, camera lens and motor, the optical axis of described camera lens and
The gyroaxis of motor is coaxial, and camera lens is located in the rotor of motor, and described camera lens front end is provided with polaroid set, polaroid set with
Motor elastic connection, in described polaroid set front polaroid and polaroid trim ring are provided with；Described camera cervical region is provided with and retrodeviates
Shake piece and the opening retaining ring for compressing rear polarizer；Camera lens switching retainer ring, institute are provided with front side of described camera adapter ring
The camera lens rear side stated is provided with camera lens switching loose collar；By focusing threaded connection camera lens switching outside described camera lens switching retainer ring
Loose collar；The gyroaxis of described polaroid set, front polaroid, rear polarizer, camera, the optical axis of camera lens and motor is coaxial.
In a kind of above-mentioned Driven by Coaxial camera light intensity regulating mechanism：Described polaroid set is ladder tubular structure,
The Elastic Teeth being distributed uniformly and circumferentially is machined with its end face with motor connection.
In a kind of above-mentioned Driven by Coaxial camera light intensity regulating mechanism：Described motor is located at the electric machine support of tubular
Interior, the stator of motor is fixed in electric machine support；Camera holder, camera holder are mounted by means of screws with described electric machine support
Interior installation camera.
In a kind of above-mentioned Driven by Coaxial camera light intensity regulating mechanism：Described Elastic Teeth and opening retaining ring adopts bullet
Property material is made.
In a kind of above-mentioned Driven by Coaxial camera light intensity regulating mechanism：Described polaroid trim ring passes through with polaroid set
Threaded connection, opening retaining ring is threadedly coupled with the adapter ring of camera.
The present invention remarkable result be：Due to being adjusted to the light intensity into camera using dual-polarization piece, two partially
The piece that shakes is overlapped and obtains the light intensity signal for eventually entering into camera, uniform so as to obtain light distribution, gradation of image value stabilization
Permanent intensity image；
The elastic connection of Elastic Teeth, realizes the fast assembling-disassembling of the front polaroid of above-mentioned polaroid set and inside, preferably
Ensure that the axiality and perpendicularity of structure installation so that photogrammetric resultant error is less.
Due to further being compressed using the opening retaining ring rear polarizer of elasticity, and it is big to have adapted to the inwall of camera adapter ring
Little structure, it is ensured that the reliable installation of rear polarizer so that the reliability of whole adjustment structure is improved.
Description of the drawings
Fig. 1 is Driven by Coaxial 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 set；7. camera lens switching is solid
Determine ring；8. camera lens switching loose collar；9. polaroid trim ring；10. polaroid before；11. rear polarizers；12. opening retaining rings.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further detail to the present invention.
As shown in figure 1, electric machine support 4 is cylindrical shape, the stator of motor 3 is fixedly mounted in electric machine support 4 by screw,
Polaroid set 6 and the elastic connection of motor 3 are caused by the installing hole of above-mentioned electric machine support 4, described polaroid set 6 is ladder cylinder
Shape structure, is machined with the Elastic Teeth being distributed uniformly and circumferentially on the end face that it is connected with motor 3, because Elastic Teeth is adopted
Made with elastomeric material so that the rotor hole elastic connection of polaroid set 6 and motor 3.Because above-mentioned polaroid set 6 is ladder cylinder
Shape structure, its inwall is provided with front polaroid 10 for stepped, and by polaroid trim ring 9 by above-mentioned front polaroid 10
Compress.Above-mentioned polaroid trim ring 9 is connected by screw thread with polaroid set 6, while front polaroid 10 is compressed.
Camera holder 5 is mounted by means of screws with described electric machine support 4, in the middle of the present embodiment, camera holder 5 is cylindrical
Camera 2 is installed in the cylindrical structure of interior side, inside, and camera 2 is fixedly mounted in camera holder 5 by screw.
The adapter ring inwall of camera 2 is machined with a circle boss, by boss by the location and installation of rear polarizer 11 in the neck of camera 2
Portion, then above-mentioned rear polarizer 11 is further compressed by the opening retaining ring 12 of elasticity for positioning, above-mentioned opening retaining ring 12
By being threadably mounted in the adapter ring of camera 2, due to adopting elastomeric material, the planform of the adapter ring of camera 2 preferably it has been adapted to.
The front side of the adapter ring of camera 2 is provided with camera lens switching retainer ring 7 by screw, and camera lens switching retainer ring 7 is outer by adjusting
Burnt screw thread is provided with camera lens switching loose collar 8, and camera lens transfers the front end of loose collar 8 by screw thread installation camera lens 1.1, above-mentioned camera lens
In the rotor of motor 3, and above-mentioned polaroid set 6, front polaroid 10, rear polarizer 11, camera 2, the optical axis of camera lens 1 and electricity
The gyroaxis of machine 3 is coaxial.
The regulation of camera light intensity is realized by following manner：The rotor of motor 3 is rotated along rotary axis system, due to polaroid set 6
Motor 3 rotor hole elastic connection, therefore polaroid set 6 also follows rotor to turn round together, solid by polaroid trim ring 9
The front polaroid 10 being scheduled on polaroid set 6 also follows rotor to turn round together, passes through inclined hence into the light of camera lens 1
The rotation of piece of shaking is modulated, and is obtained with the polarized light for rotating change, and polarized light arrives rear polarizer 11, rear polarizer by camera lens after
11 pairs are played light to the rear and carry out analyzing, and two polaroids are overlapped and obtain the light intensity signal for eventually entering into camera, when two partially
When the piece that shakes does not have relative rotation, the light intensity signal of superposition is constant, and when there is relative rotation, the light intensity signal of superposition is with relative
Corner and change, in each rotation period light and shade change twice.
Actual measurement is carried out using this governor motion, when measurement target gray value is carried out（10~150）During change so that figure
As permanent intensity image of the gray scale value stabilization 70.
Claims (5)
1. a kind of Driven by Coaxial camera light intensity regulating mechanism, it includes camera (2), camera lens (1) and motor (3), described camera lens
(1) optical axis and the gyroaxis of motor (3) is coaxial, and camera lens (1) is in the rotor of motor (3), it is characterised in that：Described mirror
Head (1) front end is provided with polaroid set (6), the rotor hole elastic connection of the polaroid set (6) and motor (3), described polaroid
Front polaroid (10) and polaroid trim ring (9) are provided with set (6)；Described camera (2) cervical region is provided with rear polarizer (11) and uses
In the opening retaining ring (12) for compressing rear polarizer (11)；Camera lens switching retainer ring is provided with front side of described camera (2) adapter ring
(7), described camera lens (1) rear side is provided with camera lens switching loose collar (8)；Described camera lens switching retainer ring (7) is outward by focusing
Threaded connection camera lens switching loose collar (8)；Described polaroid set (6), front polaroid (10), rear polarizer (11), camera
(2), the gyroaxis of the optical axis of camera lens (1) and motor (3) is coaxial.
2. a kind of Driven by Coaxial camera light intensity regulating mechanism as claimed in claim 1, it is characterised in that：Described polaroid set
(6) it is ladder tubular structure, the elasticity being distributed uniformly and circumferentially is machined with the end face that it is connected with motor (3)
Tooth.
3. a kind of Driven by Coaxial camera light intensity regulating mechanism as claimed in claim 1, it is characterised in that：Described motor (3)
It is located in the electric machine support (4) of tubular, the stator of motor (3) is fixed in electric machine support (4)；On described electric machine support (4)
It is mounted by means of screws with camera holder (5), camera holder (5) and camera (2) is installed.
4. a kind of Driven by Coaxial camera light intensity regulating mechanism as claimed in claim 2, it is characterised in that：Described Elastic Teeth and
Opening retaining ring (12) is made using elastomeric material.
5. a kind of Driven by Coaxial camera light intensity regulating mechanism as claimed in claim 1, it is characterised in that：The polaroid trim ring
(9) it is threaded connection with polaroid set (6), opening retaining ring (12) is threadedly coupled 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 |
|---|---|
| CN104345519A CN104345519A (en) | 2015-02-11 |
| CN104345519B true CN104345519B (en) | 2017-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310322437.2A Active CN104345519B (en) | 2013-07-29 | 2013-07-29 | Light intensity regulating mechanism for coaxially driven camera |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105516555A (en) * | 2015-11-26 | 2016-04-20 | 努比亚技术有限公司 | Camera module and mobile terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (3)
| 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 |
| JP4128180B2 (en) * | 2005-02-01 | 2008-07-30 | 三洋電機株式会社 | Illumination device and projection display device |
-
2013
- 2013-07-29 CN CN201310322437.2A patent/CN104345519B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN104345519A (en) | 2015-02-11 |
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