Range finding device

Details Range finding device Range finding device

1997-11-26

1999-08-17

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Reliability of focus/distance signal

396128, 396147, G03B 1336

Patent

active

059406348

ABSTRACT:
Minimum value calculator 125 detects the minimum value of a correlation value series, and waveform analyzer 126 analyzes the waveform of the correlation value series in the close shift range which exceeds the measurable range of the AF controllable range. A proximity warning is issued when the position of the minimum value is in the close shift range, or when there is monotonic decrease of the correlation value series in the close shift range. The waveform analyzer 126 also detects when a minimum value position is in an immeasurable range exceeding the close shift range, and accurately issues a proximity warning.

REFERENCES:
patent: 4762987 (1988-08-01), Ishida et al.
patent: 5202555 (1993-04-01), Ishida et al.
patent: 5202718 (1993-04-01), Uchiyama
patent: 5561497 (1996-10-01), Muramatsu et al.

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