Focus detector
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United States of America Patent
Stats
-
Jan 29, 1980
Grant Date -
N/A
app pub date -
Feb 23, 1978
filing date -
Nov 30, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A focus detector includes a movable reflecting mirror and a stationary reflecting mirror which reflect incident light admitted through a pair of independent windows for the purpose of comparison. A drive for the movable mirror drives it with different speeds during its movement in a forward and a reverse direction. The comparison takes place when the movable mirror is driven at a lower speed. The drive includes a non-symmetrical eccentric cam, a motor for rotating the eccentric cam, and a support for the movable mirror which bears against the eccentric cam. The eccentric cam is provided integrally with a mode selection cam, which operates to open and close a comparison enable switch.
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Cited Art Landscape
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