Focus detector

Details Focus detector Focus detector

1978-02-23

1980-01-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250201, 354 25, G01J 120

Patent

active

041863003

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.

REFERENCES:
patent: 3720148 (1973-03-01), Harvey
patent: 4078172 (1978-03-01), Wilwerding
patent: 4123765 (1978-10-01), Isono

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