CN114236737A - Linear electric motor driving type focusing and resetting device - Google Patents
Linear electric motor driving type focusing and resetting device Download PDFInfo
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- CN114236737A CN114236737A CN202111364895.3A CN202111364895A CN114236737A CN 114236737 A CN114236737 A CN 114236737A CN 202111364895 A CN202111364895 A CN 202111364895A CN 114236737 A CN114236737 A CN 114236737A
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- linear motor
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- focusing mirror
- pulling plate
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- 238000000034 method Methods 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 abstract description 10
- 230000007547 defect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses a linear motor driving type focusing and resetting device, which comprises a focusing mirror component serving as a motion main body, a guide rod and a guide rail serving as a support main body, a linear motor and a shaft end stud serving as a driving main body, and a focusing mirror pulling plate, a spring hanging column, a spring and a motor pulling plate serving as a resetting main body. The focusing mirror component is pushed to move forwards by the aid of the telescopic shaft of the linear motor, and the backward reset movement of the focusing mirror component is achieved by the aid of a spring between the telescopic shaft of the linear motor and the focusing mirror component. The focusing mechanism is small in design, convenient to install and stable in performance, and effectively solves the problems of motion clamping stagnation and optical axis stability in the traditional linear motor driven focusing mechanism.
Description
Technical Field
The invention belongs to the technical field of optics, and particularly relates to a focusing and resetting device.
Background
The infrared product is mainly used in day and night imaging systems, and can be widely applied to military and civil detection and reconnaissance projects. Since most infrared products work in the environment from low temperature to high temperature, the refractive index of optical materials of the products and the optical interval between lenses can change along with the temperature change, so that an optical image surface deviates from an image surface of a detector, and an image is blurred; therefore, a focusing mechanism is required to drive the focusing lens to axially move back and forth, and the optical image surface is focused on the detector image surface again, so that the aim of always keeping clear images is fulfilled.
The focusing driving mechanism is the core of the thermal infrared imager, and generally has a cam driving form, a screw driving form and a linear motor driving form.
In the traditional linear motor direct-drive focusing mechanism, a focusing motor shaft and a focusing mirror component are connected together by a nut, and due to radial runout of a motor telescopic shaft and parallelism factors of the motor shaft and a focusing mirror component support shaft, movement clamping stagnation easily occurs, so that an image is not clear, and a target cannot be normally identified.
In another traditional linear motor focusing mechanism, a spring resetting mode is adopted, one end of a spring is fixed on a static part, the other end of the spring is fixed on a focusing mirror component, and due to the change of spring force in the focusing movement process, the optical axis of the focusing mirror component generates angular deviation change and radial displacement change, so that the image stability and the image definition are influenced; in such a configuration, the linear motor is required to provide a greater thrust to counteract the spring force, which is detrimental to reducing the size and power requirements of the motor.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a linear motor driving type focusing and resetting device which comprises a focusing mirror component used as a motion main body, a guide rod and a guide rail used as a support main body, a linear motor and a shaft end stud used as a driving main body, and a focusing mirror pulling plate, a spring hanging column, a spring and a motor pulling plate used as a resetting main body. The focusing mirror component is pushed to move forwards by the aid of the telescopic shaft of the linear motor, and the backward reset movement of the focusing mirror component is achieved by the aid of a spring between the telescopic shaft of the linear motor and the focusing mirror component. The focusing mechanism is small in design, convenient to install and stable in performance, and effectively solves the problems of motion clamping stagnation and optical axis stability in the traditional linear motor driven focusing mechanism.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a linear motor driving type focusing reset device comprises a focusing mirror component, a guide rod, a guide rail, a focusing mirror pull plate, a spring hanging column, a spring, a linear motor, a motor pull plate and a shaft end stud;
the focusing mirror component is arranged on the guide rail through the guide rod;
the focusing mirror pulling plate is fixedly connected with the focusing mirror component;
the shaft end stud is arranged at the tail end of a linear motor shaft, and the motor pulling plate is fixedly connected with the linear motor;
the spring hanging columns are respectively arranged on the focusing mirror pulling plate and the motor pulling plate, and the hooks at the two ends of the spring are respectively hung on the spring hanging columns of the focusing mirror pulling plate and the motor pulling plate.
When the linear motor does extension movement, a shaft end stud arranged on a shaft of the linear motor pushes the focusing mirror component to move forwards; when the linear motor does retraction movement, the focusing mirror part moves backwards by means of the tension of the spring;
in the moving process, the two ends of the spring move along with the linear motor shaft and the focusing mirror part, and the length and the tension value are kept unchanged.
Preferably, the tension value of the spring is greater than the overload force.
The invention has the following beneficial effects:
the invention utilizes the telescopic shaft of the linear motor to push the focusing mirror component to move forward, and utilizes the spring between the telescopic shaft of the linear motor and the focusing mirror component to realize the backward reset movement of the focusing mirror component. The focusing mechanism is small in design, convenient to install and stable in performance, and effectively solves the problems of motion clamping stagnation and optical axis stability in the traditional linear motor driven focusing mechanism.
Drawings
FIG. 1 is a side view of the focus drive reset mechanism of the present invention.
FIG. 2 is a front view of the focus drive reset mechanism of the present invention.
In the figure: 1-focusing lens part, 2-guide rod, 3-guide rail, 4-focusing lens pulling plate, 5-spring hanging column, 6-spring, 7-linear motor, 8-motor pulling plate and 9-shaft end stud.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The invention aims to provide a focusing drive resetting device which can improve the motion reliability of a focusing mechanism and reduce the requirement of linear motor output thrust to a certain extent according to the defects of the prior art. The linear motor and the focusing mirror component are flexibly connected through the spring, and the tension of the spring in the front and back movement processes of the focusing mechanism is kept unchanged, so that the focusing mechanism can move smoothly in the focusing process, and the optical axis of the focusing mirror component is kept stable.
The key of the structure of the invention is that a return spring with unchanged tension is arranged between the telescopic shaft of the focusing motor and the focusing mirror component, the traditional nut connection mode is changed into a spring connection mode, namely, the flexible connection is used for replacing the rigid connection, thus the fault caused by clamping stagnation due to radial contact between the telescopic shaft of the focusing motor and the focusing mirror component in the movement process can be avoided; the focusing mechanism pushes the focusing mirror component to move forwards, and the length and the tension of the spring are kept unchanged in the process of resetting the spring backwards, so that the problem of unstable optical axis of the focusing mirror component caused by the tension change of the spring in the traditional configuration is solved.
As shown in fig. 1 and 2, a linear motor driven type focusing and resetting device comprises a focusing mirror part 1, a guide rod 2, a guide rail 3, a focusing mirror pulling plate 4, a spring hanging column 5, a spring 6, a linear motor 7, a motor pulling plate 8 and a shaft end stud 9;
the focusing mirror component 1 is arranged on the guide rail 3 through the guide rod 2;
the focusing mirror pulling plate 4 is fixedly connected with the focusing mirror component 1;
the shaft end stud 9 is arranged at the tail end of a shaft of the linear motor 7, and the motor pulling plate 8 is fixedly connected with the linear motor 7;
the focusing mirror pulling plate 4 and the motor pulling plate 8 are respectively provided with a spring hanging column 5, and the hooks at the two ends of the spring 6 are respectively hung on the spring hanging columns 5 of the focusing mirror pulling plate 4 and the motor pulling plate 8.
When the linear motor 7 extends out, a shaft end stud 9 arranged on the shaft of the linear motor 7 pushes the focusing mirror component 1 to move forwards; when the linear motor 7 retracts, the focusing mirror component 1 moves backwards by means of the tension of the spring 6;
in the moving process, the two ends of the spring 6 move together with the shaft of the linear motor 7 and the focusing mirror component 1, and the length and the tension value are kept unchanged.
And calculating the tension value of the spring 6 according to the quality of the focusing lens component 1 and the vibration acceleration requirement of the thermal infrared imager, and reasonably designing the spring 6 according to the tension value to ensure that the tension value of the spring 6 after being installed is larger than the overload force.
Claims (2)
1. A linear motor driving type focusing reset device is characterized by comprising a focusing mirror component, a guide rod, a guide rail, a focusing mirror pull plate, a spring hanging column, a spring, a linear motor, a motor pull plate and a shaft end stud;
the focusing mirror component is arranged on the guide rail through the guide rod;
the focusing mirror pulling plate is fixedly connected with the focusing mirror component;
the shaft end stud is arranged at the tail end of a linear motor shaft, and the motor pulling plate is fixedly connected with the linear motor;
the focus adjusting mirror pulling plate and the motor pulling plate are respectively provided with a spring hanging column, and hooks at two ends of the spring are respectively hung on the spring hanging columns of the focus adjusting mirror pulling plate and the motor pulling plate;
when the linear motor does extension movement, a shaft end stud arranged on a shaft of the linear motor pushes the focusing mirror component to move forwards; when the linear motor does retraction movement, the focusing mirror part moves backwards by means of the tension of the spring;
in the moving process, the two ends of the spring move along with the linear motor shaft and the focusing mirror part, and the length and the tension value are kept unchanged.
2. The linear motor driving type focusing and resetting device is characterized in that the tension value of the spring is greater than the overload force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111364895.3A CN114236737A (en) | 2021-11-17 | 2021-11-17 | Linear electric motor driving type focusing and resetting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111364895.3A CN114236737A (en) | 2021-11-17 | 2021-11-17 | Linear electric motor driving type focusing and resetting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114236737A true CN114236737A (en) | 2022-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111364895.3A Pending CN114236737A (en) | 2021-11-17 | 2021-11-17 | Linear electric motor driving type focusing and resetting device |
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| CN (1) | CN114236737A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116577900A (en) * | 2023-07-13 | 2023-08-11 | 中国科学院长春光学精密机械与物理研究所 | Photoelectric imaging system with allele focal length adjustment function |
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|---|---|---|---|---|
| JPH0815752A (en) * | 1994-06-28 | 1996-01-19 | Kyocera Corp | Back focus driving mechanism for automatic focusing single lens reflex camera |
| JP2000214391A (en) * | 1999-01-26 | 2000-08-04 | Mitsubishi Electric Corp | Automatic guider |
| JP2005165058A (en) * | 2003-12-03 | 2005-06-23 | Sharp Corp | Automatic focusing device |
| US20100134906A1 (en) * | 2008-12-02 | 2010-06-03 | Minebea Co., Ltd. | Actuator for lens driving mechanism |
| CN205982952U (en) * | 2016-08-19 | 2017-02-22 | 深圳市联合东创科技有限公司 | Camera focusing apparatus |
| CN206247261U (en) * | 2016-11-14 | 2017-06-13 | 广州达森灯光股份有限公司 | A kind of stage lamp focus control |
| CN107703598A (en) * | 2017-09-14 | 2018-02-16 | 中国科学院长春光学精密机械与物理研究所 | A kind of optical instrument varifocal mechanical device |
| CN107894644A (en) * | 2017-11-25 | 2018-04-10 | 中国科学院长春光学精密机械与物理研究所 | Airborne optical lens focusing mechanism |
| CN110727077A (en) * | 2019-10-09 | 2020-01-24 | 中国航空工业集团公司洛阳电光设备研究所 | Centroid driving focusing mechanism based on flexible hinge |
| CN214174750U (en) * | 2020-11-26 | 2021-09-10 | 中国航空工业集团公司洛阳电光设备研究所 | External auto-collimation receiving device |
-
2021
- 2021-11-17 CN CN202111364895.3A patent/CN114236737A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0815752A (en) * | 1994-06-28 | 1996-01-19 | Kyocera Corp | Back focus driving mechanism for automatic focusing single lens reflex camera |
| JP2000214391A (en) * | 1999-01-26 | 2000-08-04 | Mitsubishi Electric Corp | Automatic guider |
| JP2005165058A (en) * | 2003-12-03 | 2005-06-23 | Sharp Corp | Automatic focusing device |
| US20100134906A1 (en) * | 2008-12-02 | 2010-06-03 | Minebea Co., Ltd. | Actuator for lens driving mechanism |
| CN205982952U (en) * | 2016-08-19 | 2017-02-22 | 深圳市联合东创科技有限公司 | Camera focusing apparatus |
| CN206247261U (en) * | 2016-11-14 | 2017-06-13 | 广州达森灯光股份有限公司 | A kind of stage lamp focus control |
| CN107703598A (en) * | 2017-09-14 | 2018-02-16 | 中国科学院长春光学精密机械与物理研究所 | A kind of optical instrument varifocal mechanical device |
| CN107894644A (en) * | 2017-11-25 | 2018-04-10 | 中国科学院长春光学精密机械与物理研究所 | Airborne optical lens focusing mechanism |
| CN110727077A (en) * | 2019-10-09 | 2020-01-24 | 中国航空工业集团公司洛阳电光设备研究所 | Centroid driving focusing mechanism based on flexible hinge |
| CN214174750U (en) * | 2020-11-26 | 2021-09-10 | 中国航空工业集团公司洛阳电光设备研究所 | External auto-collimation receiving device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116577900A (en) * | 2023-07-13 | 2023-08-11 | 中国科学院长春光学精密机械与物理研究所 | Photoelectric imaging system with allele focal length adjustment function |
| CN116577900B (en) * | 2023-07-13 | 2023-09-22 | 中国科学院长春光学精密机械与物理研究所 | Photoelectric imaging system with allele focal length adjustment function |
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