Volume 3Issue 6

Dec. 2010

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Chinese Optics> 2010> 3(6): 649-652.

JIA Qing-lian, WANG Chun-xia. Mechanism design of focal output for zoom lens[J]. Chinese Optics, 2010, 3(6): 649-652.

Citation:

JIA Qing-lian, WANG Chun-xia. Mechanism design of focal output for zoom lens[J].Chinese Optics, 2010, 3(6): 649-652.

JIA Qing-lian, WANG Chun-xia. Mechanism design of focal output for zoom lens[J]. Chinese Optics, 2010, 3(6): 649-652.

Citation:

JIA Qing-lian, WANG Chun-xia. Mechanism design of focal output for zoom lens[J].Chinese Optics, 2010, 3(6): 649-652.

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Mechanism design of focal output for zoom lens

Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Science,Changchun 130033,China

Received Date:11 Jul 2010
Rev Recd Date:23 Sep 2010
Publish Date:20 Dec 2010

Abstract

Abstract

A mechanism structure for the focal output of a zoom lens in varifocusing process was designed based on the relation of system focus, variable magnification unit and compensation unit in the optical design. A line displacement sensor was taken as feedback, a worm wheel and a worm as drive-elements in the mechanism structure, and a joint pole was adopted to fix and join the high-precision line displacement sensor and the zoom lens, so that the motion values of zoom lens was directly feeded back to the voltage of line displacement sensor. As compared with traditional mechanism structure that the focal-length was calculated by the relation of the cam rotational angle acquired by gear-driven potentiometer, the precision was low for the last motion error of gear, clearance of cam, drive nail and the potentiometer error. The results of precision analysis show that the focal-length can be obtained immediately based on the voltage of line displacement sensor which reflectes the displaces of zoom lens, therefore the precision for focal output is improved greatly.
- zoom lens,
- structural design,
- focal length,
- precision

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References (1)

References

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