Phase-difference detector using an analog arithmetic correlation

Details Phase-difference detector using an analog arithmetic correlation Phase-difference detector using an analog arithmetic correlation

1989-03-10

1991-11-26

Orsino, Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354408, 2502018, G01J 120

Patent

active

050687387

ABSTRACT:
A phase-difference detector for use with an auto-focus detecting apparatus of a camera, the detector is capable of performing an arithmetic correlation process for detecting a phase-difference at a high speed with high accuracy. This detector uses an analog correlation arithmetic device for carrying out an analog correlation arithmetic process which generates correlative values associated with a pair of analog electric signals outputted from a pair of optical sensors. An A/D converter converts the generated correlative values outputted from the analog correlation arithmetic device into digital signals. The correlation arithmetic operation is done by directly using the analog signals generated during a photoelectric conversion, and the correlative values obtained by this computation are converted into digital signals, thereby allowing the arithmetic process to be performed at a high speed. Also, since there is substantially no rounding error incidental to a digital correlation arithmetic process because the digital conversion takes place after the correlation process, highly accurate arithmetic results can be obtained.

REFERENCES:
patent: 4178098 (1979-12-01), Asano et al.
patent: 4432622 (1984-02-01), Kawashima et al.
patent: 4602153 (1986-07-01), Suzuki
patent: 4746790 (1988-05-01), Sorimachi
patent: 4849619 (1989-07-01), Miida et al.

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