1981-11-27
1984-09-25
Adams, Russell E.
354405, G03B 300, G03B 1318
Patent
active
044732856
ABSTRACT:
A camera is provided with flash lamp means, preferably a single flash lamp, useful for both range-determining purposes, for automatic focus control and/or flash lamp light exposure control, and in response to depression of the shutter release control, generates an initial range-determining flash of light and then a film exposure flash of light if flash exposure is desired. Before the shutter is opened, the range-determining flash of light reflected from the object involved is detected by a light sensor feeding the inputs of one or more signal level detectors respectively responsive to different peak levels of the reflected flash lamp light profiles indicating object distances falling within different adjacent range zones by being triggered into a given state. In the automatic focus control form of the invention, the outputs of the signal level detectors are scanned sequentially in the order where the signal level detectors responsive to profiles of objects in the nearest range zone are scanned first. A rotatable lens unit starting from a nearest range focussing position is stopped when the first signal level detector having a triggered condition is scanned, the lens unit then being in a properly focussed position for the corresponding range zone.
REFERENCES:
patent: 4288152 (1981-09-01), Matsuda
patent: 4357083 (1982-11-01), Johnson et al.
Adams Russell E.
Hattis Russell E.
W. Haking Enterprises Limited
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