CN211720638U - Focusing mechanism of fixed-focus fixed-view-field television camera - Google Patents
Focusing mechanism of fixed-focus fixed-view-field television camera Download PDFInfo
- Publication number
- CN211720638U CN211720638U CN202020495583.0U CN202020495583U CN211720638U CN 211720638 U CN211720638 U CN 211720638U CN 202020495583 U CN202020495583 U CN 202020495583U CN 211720638 U CN211720638 U CN 211720638U
- Authority
- CN
- China
- Prior art keywords
- fixed
- image sensor
- motor
- direct current
- focus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Automatic Focus Adjustment (AREA)
- Lens Barrels (AREA)
Abstract
The utility model relates to a focusing mechanism of a fixed focus fixed view field television camera, a linear guide rail of the mechanism is arranged on a fixed focus lens seat and is parallel to an optical central shaft of a fixed focus lens; the motor base is fixed on the fixed-focus lens base, the direct current motor is connected to the motor base, and a motor shaft of the direct current motor is orthogonal to the linear guide rail; the eccentric shaft is coaxially connected with a motor shaft of the direct current motor; the guide pillar is connected to the image sensor fixing seat, one side of the image sensor fixing seat is connected with the linear guide rail, and the other side of the image sensor fixing seat is connected with the image sensor; the miniature bearing is arranged on the guide pillar, and the excircle of the miniature bearing is tangent to the excircle of the eccentric shaft. The utility model discloses a change image sensor's back working distance and realized the focusing of the fixed field of vision of focusing, it is fast to have focusing speed, the advantage of focusing precision height.
Description
Technical Field
The utility model belongs to the technical field of optical instrument, a focus fixed view field TV camera focusing structure is related to.
Background
Since the temperature and the air pressure change with the change of the altitude, and the change of the temperature and the air pressure causes the change of the curvature radius, the thickness, the air interval and the transmittance of the optical glass in the television camera, thereby causing the change of the focal length and the rear working distance, the Sensor (image Sensor) generates defocusing at the preset position. Defocusing has a large influence on the quality, and therefore, a focusing mechanism needs to be designed to compensate for defocusing. The fixed view field television camera can not realize focusing by changing the air interval of the glass, so the traditional method that the cylindrical cam spiral groove drives the guide pin and the lens cone to move back and forth is not applicable to focusing of fixed focus and fixed view field. The utility model discloses a focusing mechanism has realized the focusing of the fixed field of vision of focusing through the back working distance that changes sensor.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a focusing mechanism of fixed burnt fixed view field TV camera, this mechanism can solve fixed burnt fixed view field TV camera and produce the problem of out-of-focus because of temperature and atmospheric pressure change.
In order to solve the technical problem, the focusing mechanism of the fixed-focus fixed-view television camera comprises a linear guide rail, an image sensor fixing seat, an eccentric shaft, a miniature bearing, a guide pillar, a direct current motor and a motor seat; the linear guide rail is arranged on the fixed-focus lens base and is parallel to the optical central axis of the fixed-focus lens; the motor base is fixed on the fixed-focus lens base, the direct current motor is connected to the motor base, and a motor shaft of the direct current motor is orthogonal to the linear guide rail; the eccentric shaft is coaxially connected with a motor shaft of the direct current motor; the guide pillar is connected to the image sensor fixing seat, one side of the image sensor fixing seat is connected with the linear guide rail, and the other side of the image sensor fixing seat is connected with the image sensor; the miniature bearing is arranged on the guide pillar, and the excircle of the miniature bearing is tangent to the excircle of the eccentric shaft.
The image sensor fixing seat is in an L-shaped right-angle structure, the horizontal part of the image sensor fixing seat is connected with the sliding block on the linear guide rail, and the vertical part of the image sensor fixing seat is connected with the image sensor.
The direct current motor adopts a direct current motor with a planetary gear reduction box.
Two annular grooves are formed in the guide post, and two elastic check rings are embedded into the grooves and clamped at two ends of the miniature bearing to axially position the miniature bearing.
Furthermore, the utility model also comprises an extension spring; one end of the extension spring is connected with the fixed-focus lens base, and the other end of the extension spring is connected with the image sensor fixing base.
The utility model has the advantages that:
the utility model discloses an image sensor target surface position has realized the focusing of the fixed field of view of fixed focus through the back working distance that changes image sensor along the little displacement adjustment function of optical system center pin direction, has solved the fixed field of view TV camera of fixed focus and has produced the problem of out of focus because of temperature and pressure change. The mechanism has the advantages of high focusing speed and high focusing precision.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of a linear guide mounting surface.
In the figure: 1. a fixed focus lens base; 2. a linear guide rail; 3. an image sensor holder; 4. an eccentric shaft; 5. a micro-bearing; 6. a guide post; 7. an image sensor; 8. a direct current motor; 9. an extension spring; 10. a motor base.
Detailed Description
As shown in fig. 1 and 2, the focusing mechanism of the fixed-focus fixed-view television camera of the present invention includes a linear guide rail 2, an image sensor fixing base 3, an eccentric shaft 4, a micro bearing 5, a guide pillar 6, a direct current motor 8, an extension spring 9, and a motor base 10.
The linear guide rail 2 is arranged on the fixed-focus lens base 1, the side surface of the linear guide rail is attached to the reference surface of the fixed-focus lens base 1, the guiding effect is achieved, the linear guide rail 2 is parallel to the optical center axis of the fixed-focus lens, and the image sensor is guaranteed to move back and forth along the optical center axis direction of the lens. Further ensuring that the image sensor can move back and forth along the optical central axis direction of the fixed-focus lens; the parallelism between the reference surface of the fixed-focus lens base 1 and the optical central axis of the fixed-focus lens is within 0.01mm, and the parallelism is ensured by machining.
The motor base 10 is fixed on the fixed-focus lens base 1, the direct current motor 8 is connected to the motor base 10 through a screw, and a motor shaft of the direct current motor 8 is orthogonal to the linear guide rail 2. The direct current motor 8 adopts a direct current motor with a planetary gear reduction box.
The eccentric shaft 4 is coaxially connected with a motor shaft of the direct current motor 8 through a cylindrical pin. The eccentricity e of the eccentric shaft 4 is determined according to the focal depth design of the optical system.
The guide post 6 is connected on the image sensor fixing seat 3 through threads. The image sensor fixing seat 3 is in an L-shaped right-angle structure, the horizontal part of the image sensor fixing seat is connected with the sliding block on the linear guide rail 2, and the vertical part of the image sensor fixing seat is connected with the image sensor 7.
The miniature bearing 5 is arranged on the guide post 6, two annular grooves are formed in the guide post 6, and two elastic check rings are embedded into the grooves and clamped at two ends of the miniature bearing 5 to axially position the miniature bearing 5; the excircle of the miniature bearing 5 is tangent to the excircle of the eccentric shaft 4.
The focusing process of the fixed-focus fixed-view television camera is actually a process of driving an image sensor to generate micro displacement through a focusing mechanism so that a target surface of the image sensor coincides with a focus of a lens optical system.
One end of the extension spring 9 is connected with the fixed-focus lens holder 1, and the other end is connected with the image sensor fixing seat 3.
The motor shaft rotation direction and rotation speed of the dc motor 8 can be controlled by the dc motor drive controller. When the direct current motor 8 rotates forwards, the motor shaft drives the eccentric shaft 4 on the motor shaft to rotate, the image sensor fixing seat 3 is driven to slide along the linear guide rail 2 through the miniature bearing 5 and the guide post 6, so that the image sensor 7 moves towards the direction far away from the focus of the lens optical system, and the extension spring 9 generates tensile elastic deformation at the moment.
When the direct current motor 8 rotates reversely, the tension generated by the extension spring 9 drives the image sensor fixing seat 3 to move along the linear guide rail 2, so as to drive the image sensor 7 to move towards the direction close to the focus of the lens optical system.
Claims (5)
1. A focusing mechanism of a fixed-focus fixed-view television camera is characterized by comprising a linear guide rail (2), an image sensor fixing seat (3), an eccentric shaft (4), a miniature bearing (5), a guide post (6), a direct current motor (8) and a motor seat (10); the linear guide rail (2) is arranged on the fixed-focus lens base (1) and is parallel to the optical central axis of the fixed-focus lens; the motor base (10) is fixed on the fixed-focus lens holder (1), the direct current motor (8) is connected to the motor base (10), and a motor shaft of the direct current motor (8) is orthogonal to the linear guide rail (2); the eccentric shaft (4) is coaxially connected with a motor shaft of the direct current motor (8); the guide post (6) is connected to the image sensor fixing seat (3), one side of the image sensor fixing seat (3) is connected with the linear guide rail (2), and the other side of the image sensor fixing seat is connected with the image sensor (7); the miniature bearing (5) is arranged on the guide post (6), and the excircle of the miniature bearing (5) is tangent to the excircle of the eccentric shaft (4).
2. The focusing mechanism of the fixed focus fixed field of view television camera according to claim 1, wherein the image sensor holder (3) is in an L-shaped right angle configuration, the horizontal portion of which is connected to the slider on the linear guide (2) and the vertical portion of which is connected to the image sensor (7).
3. The focusing mechanism of a fixed-focus fixed-field television camera according to claim 1, wherein the direct current motor (8) is a direct current motor with a planetary gear reduction box.
4. The focusing mechanism of the fixed-focus fixed-view television camera according to claim 1, wherein the guide post (6) is provided with two annular grooves, and two elastic check rings are embedded into the grooves and clamped at two ends of the micro bearing (5) to axially position the micro bearing (5).
5. The focusing mechanism of a fixed focus fixed field television camera according to claim 1, further comprising an extension spring (9); one end of the extension spring (9) is connected with the fixed-focus lens holder (1), and the other end is connected with the image sensor fixing seat (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020495583.0U CN211720638U (en) | 2020-04-08 | 2020-04-08 | Focusing mechanism of fixed-focus fixed-view-field television camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020495583.0U CN211720638U (en) | 2020-04-08 | 2020-04-08 | Focusing mechanism of fixed-focus fixed-view-field television camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211720638U true CN211720638U (en) | 2020-10-20 |
Family
ID=72835236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020495583.0U Active CN211720638U (en) | 2020-04-08 | 2020-04-08 | Focusing mechanism of fixed-focus fixed-view-field television camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211720638U (en) |
-
2020
- 2020-04-08 CN CN202020495583.0U patent/CN211720638U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103631011B (en) | A kind of microscope is focused objective table device fast | |
| CN104181669B (en) | Large-zoom-ratio zooming laser illuminator | |
| CN201188142Y (en) | Optical system driven by piezo-electric motor for focusing | |
| CN102436055B (en) | High-precision light focusing mechanism applied to space optical remote sensor | |
| CN109358401B (en) | Optical lens frame | |
| CN106647108A (en) | Lens assembly capable of realizing automatic focusing by adopting fixed focus lens | |
| CN107238916B (en) | High-definition continuous zoom lens with large zoom ratio and long focal length | |
| CN111856698A (en) | Driving structure, driving device and electronic equipment | |
| CN203950064U (en) | A kind of focus adjusting mechanism of camera lens and camera lens | |
| CN111856696A (en) | Lens driving structure, driving device and electronic equipment | |
| CN106154522A (en) | LONG WAVE INFRARED big target surface double-view field varifocal lens and Zooming method thereof | |
| CN109239885A (en) | Continuous zoom thermal imaging system it is guide locating device provided | |
| CN203587877U (en) | Microscope fast focusing objective table device | |
| CN211720638U (en) | Focusing mechanism of fixed-focus fixed-view-field television camera | |
| CN220438644U (en) | Reflector structure for microscope | |
| CN107234335B (en) | Focusing device for laser welding head | |
| CN1300616C (en) | Integrative zoom lens | |
| CN107703598A (en) | A kind of optical instrument varifocal mechanical device | |
| CN217238506U (en) | Large-caliber turning type long-focus ultra-high-definition zoom lens | |
| CN111031207A (en) | Lens back focus continuous adjusting device and camera | |
| CN103676078A (en) | Zoom lens adjusting structure | |
| CN112558224B (en) | Optical fiber alignment device | |
| CN106125272B (en) | Continuous vari-focus telephotography camera lens and its control method | |
| CN112987312B (en) | Interpupillary distance adjusting structure and electronic equipment | |
| CN210626756U (en) | Focusing mechanism of beam expanding lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Building 2, Changchun Jingyue Technology Achievement Undertaking and Transformation Base, No. 888 Dujuan Road, Jingyue Development Zone, Changchun City, Jilin Province, 130033 Patentee after: Changchun Tongshi Optoelectronic Technology Co.,Ltd. Address before: Room 5005, Minsheng building, Jingyue hi tech Zone, Changchun, Jilin Province, 130000 Patentee before: CHANGCHUN TONGSHI PHOTOELECTRIC TECHNOLOGY Co.,Ltd. |