Focus detection method utilizing surface acoustic wave

Details Focus detection method utilizing surface acoustic wave Focus detection method utilizing surface acoustic wave

1983-11-16

1986-08-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354406, G01J 120

Patent

active

046084908

ABSTRACT:
Method for detecting a focus condition of an imaging optical system by using a surface acoustic wave device is disclosed. A light receiving element array formed by a plurality of light receiving elements receives a light flux transmitted through at least a part of an image formed by the imaging optical system. Then, outputs of said light receiving elements are processed on real time by means of a Fourier transform device including a surface acoustic wave device, a convolver, etc. so as to derive an image sharpness and/or an image lateral shift, both of which are used for a focus detection. Therefore, as compared with a conventional focus detection method, it is possible to perform the focus detection in a fast and accurate manner by a simple and small construction.

REFERENCES:
patent: 4457621 (1984-07-01), Harris et al.

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