Optoelectric focusing system for the camera industry

Dan-Kang Hu; Ming Li; Zhi-Ming Lu

doi:10.1117/12.156349

22 September 1993 Opto-electric focusing system for the camera industry

Dan-Kang Hu, Ming Li, Zhi-Ming Lu

Proceedings Volume 2101, Measurement Technology and Intelligent Instruments; (1993) https://doi.org/10.1117/12.156349
Event: Measurement Technology and Intelligent Instruments, 1993, Wuhan, China

Abstract

In camera industry to find the focal plane of the camera lens is important for quality control. Several opto-electric focusing techniques have been investgated. An opto-electric instrument which can be used in assembly line is presented. The measurement system includes modulated light source, optical system with displacement sensor, plane mirror, sensing device, signal processing system, interface, microcomputer system. A SPICE program is used for design the signal processing system. The opto-electric focusing system can be used for finding the focal plane of the fixed length camera lens and the zoom. The dynamic measurement is avilable. The drift of image plane also can be measured when the object distance from infincitive to 0. 6 meter. The optoelectric focusing system is being used in the Shanghai Camera factory at the assembly line.

Citation Download Citation

Dan-Kang Hu, Ming Li, and Zhi-Ming Lu "Opto-electric focusing system for the camera industry", Proc. SPIE 2101, Measurement Technology and Intelligent Instruments, (22 September 1993); https://doi.org/10.1117/12.156349

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