Electric zoom camera
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United States of America Patent
Stats
-
Jul 2, 1991
Grant Date -
N/A
app pub date -
Sep 18, 1990
filing date -
Sep 18, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Electric zoom camera wherein zooming speed is not influenced even by drop of power source voltage, by driving its zooming electric motor by an electric pulse current such that the period (T.sub.0, T.sub.1, T.sub.2, -- -) is defined by present period of a lens position signal 'b' from a lens position detector (2) which consists of a photo-interrupter and a photo-coupler, and each of the period length is divided into a first portion (Po) (off-portion) wherein motor current is off and a second portion (Pd) (duty portion) wherein the motor current is on, the length of the first portion (Po) being adjusted responding to the present zooming speed obtained from the lens position signal outputted from the lens position detector (2).
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