Distance measuring device

Details Distance measuring device Distance measuring device

1985-07-11

1990-10-30

Adams, Russell E.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354403, 356 1, 356 4, G03B 1336

Patent

active

049672231

ABSTRACT:
An arrangement in which a camera has its lens focused in with a distance measuring device. In the distance measuring device, a photosensor receives light reflected by an object and produces two signals whose difference represent the distance to the object. An information detector integrates the signal difference over a first time period and then inversely integrates the sum of the signals over a second time period to establish a distance on the basis of the time it takes for the integrated value to reach its initial level. An infinity detector determines whether the object is at infinity on the basis of the level of the integrated value a predetermined time after the start of, but later than the end of the first period.

REFERENCES:
patent: 4441810 (1984-04-01), Momose et al.
patent: 4470681 (1984-09-01), Johnson
patent: 4477168 (1984-10-01), Hosoe
patent: 4527892 (1985-07-01), Yamane et al.
patent: 4541702 (1985-09-01), Momose et al.
patent: 4542971 (1985-09-01), Numata
patent: 4560266 (1985-12-01), Namai et al.
patent: 4571048 (1986-02-01), Sugawara
patent: 4573783 (1986-03-01), Maruyama
patent: 4593987 (1986-06-01), Takahashi et al.

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