Data correcting device in an automatic focus detecting system

Details Data correcting device in an automatic focus detecting system Data correcting device in an automatic focus detecting system

1984-02-23

1986-12-30

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354403, 354406, G01J 136

Patent

active

046330739

ABSTRACT:
An automatic focus detecting device comprising a photoelectric converting device formed by arranging many elements, a pupil divider capable of forming two object images on the photoelectric converting device through different light paths, a device capable of detecting an in-focus position by processing two image data obtained as output signals from the photoelectric converting device, a device for determining the reciprocal numbers of the output signals obtained by applying a uniform light onto the photoelectric converting device and a device for receiving the image data to correct the signals for output multiplying the image data by these reciprocal numbers in order to enable accurate focusing. The photoelectric converting device is so arranged as to receive the light having passed through an infrared cut filter or a band pass filter.

REFERENCES:
patent: 3906219 (1975-09-01), Stauffer
patent: 4078171 (1978-03-01), Stauffer
patent: 4201456 (1980-05-01), Wolbarsht
patent: 4350884 (1982-09-01), Vollath

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