Cam focusing mechanism employing backlash elimination gear

A gear and gap technology, applied in the field of optical focusing, can solve the problems of return error, low focusing precision, and inability to adjust the perpendicularity between the optical axis of the optical component and the camera image plane, so as to eliminate the return error and improve the focusing precision. Effect

Inactive Publication Date: 2012-01-11
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of backlash error and low focusing accuracy in the gear transmission existing in the prior art; at the same time, it is impossible to adjust the perpendicularity between the optical axis of the optical component and the image plane of the camera, the present invention provides a cam with anti-backlash gear Focus mechanism

Method used

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  • Cam focusing mechanism employing backlash elimination gear
  • Cam focusing mechanism employing backlash elimination gear
  • Cam focusing mechanism employing backlash elimination gear

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0013] Such as Figure 1 to Figure 3 As shown, the cam focusing mechanism using the anti-backlash gear in the present invention includes: a linear groove sleeve 1, a gear-cam groove sleeve 2, an anti-backlash gear 3, a shaft circlip 4, a focusing pin 5, and a steel ball 6 , retaining ring 7, nut 8, flange assembly, motor gear 16, motor 17, fixing nail 18 and spring 19. Among them, the flange assembly is composed of a sleeve flange 9, a flange gasket 10 and a camera flange 11, and the gear-cam groove sleeve 2 is composed of a gear plate 2-1, a cam groove 2-2 and a sleeve 2-3 . The focus mechanism adjusts the focus of the optical components of the camera 12 .

[0014] Such as figure 2 As shown, the gear-cam groove sleeve 2 of the present invention fits on the outside of the linear groove sleeve 1, and the gear-cam groove sleeve 2 and the backlash eliminati...

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PUM

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Abstract

The invention, which belongs to the optical focusing field, discloses a cam focusing mechanism employing a backlash elimination gear. The focusing mechanism comprises: a straight line groove sleeve, a gear-cam groove sleeve, a backlash elimination gear, a focusing pin, a fastening nail, a spring and a flange assembly. An optical assembly is sleeved in the straight line groove sleeve. The gear-cam groove sleeve is sleeved out of the straight line groove sleeve and steel balls are arranged between the gear-cam groove sleeve and the straight line groove sleeve. The gear-cam groove sleeve, the backlash elimination gear, the fastening nail and the spring form a gear backlash elimination mechanism. A camera is connected with the straight line groove sleeve through the flange assembly. Optical focusing is achieved through motor drive, gear backlash elimination mechanism transmission and optical assembly movements driven by the focusing pin. In the invention, the gear backlash elimination mechanism is adopted to eliminate a hysteresis error of gear drive and raise focusing precision. And the cam focusing mechanism is connected with the camera through the flange assembly so that a verticality of an optical axis of an optical path and a camera image surface can be conveniently adjusted.

Description

technical field [0001] The invention belongs to the field of optical focusing, and in particular relates to a cam focusing mechanism using backlash-eliminating gears. Background technique [0002] The cam focusing mechanism has the characteristics of simple structure, high precision, strong shock resistance, and is not easy to get stuck during movement. It is a commonly used camera focusing mechanism. The cam focusing mechanism generally adopts transmission methods such as gears or worm gears. Due to the return error of gear transmission, this affects the accuracy of focusing to a certain extent. Although the existing focusing method or transmission mode has played a certain role in improving the focusing precision, the structure is relatively complicated and the processing cost is relatively high. [0003] Furthermore, in most cases, the camera is generally fixed together with the focusing mechanism directly through a threaded connection. Although this method has a simpl...

Claims

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Application Information

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IPC IPC(8): G02B7/04
Inventor 李小虎季兆钦赵健王鹤张艳超郭帮辉
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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