Distance measuring apparatus

Details Distance measuring apparatus Distance measuring apparatus

1996-06-11

1998-04-28

Metjahic, Safet

Photography

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

Having auxiliary illumination

396109, G03B 1320, G03B 1318

Patent

active

057458065

ABSTRACT:
A distance measuring apparatus includes distance measuring units of the active and passive methods, and a distance-value selecting circuit for selecting and outputting one of distance measurement results obtained from these distance measuring units. When a self-timer mode is set, distance measurement of the active method is inhibited, and distance measurement is executed by only the passive method. When the power supply voltage is lower than a predetermined voltage value at which distance measurement can be properly executed by the active method, distance measurement by the active method is inhibited, and distance measurement is executed by only the passive method. Therefore, erroneous distance measurement can be prevented, and distance measurement having high reliability can be performed.

REFERENCES:
patent: 4494847 (1985-01-01), Yamada
patent: 4518242 (1985-05-01), Toyama
patent: 4592638 (1986-06-01), Kaneda et al.
patent: 4799078 (1989-01-01), Hayama
patent: 4947202 (1990-08-01), Kitajima et al.
patent: 5081344 (1992-01-01), Misawa
patent: 5121153 (1992-06-01), Yamada et al.
patent: 5121154 (1992-06-01), Yamada et al.
patent: 5315342 (1994-05-01), Cocca

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