Focus indicating device in a camera

Details Focus indicating device in a camera Focus indicating device in a camera

1979-07-24

1981-04-28

Gellner, Michael L.

354 53, 354 60E, G03B 300, G03B 1720

Patent

active

042641608

ABSTRACT:
A focus indicating device in a camera employing a photoelectric transducer for scanning the image of an object to output a time series signal equivalent to the brightness distribution of the image. A contrast detection circuit extracts a power spectrum in a high spatial frequency range which becomes a contrast signal of the image. An indication meter indicates the contrast signal directly in the view finder of the camera with the deflection angle indicating a maximum value when proper focus is obtained.

REFERENCES:
patent: 4171885 (1979-10-01), Kondo
patent: 4178098 (1979-12-01), Asano et al.
patent: 4180309 (1979-12-01), Miyata et al.
patent: 4183642 (1980-01-01), Fukuoka

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