Camera system having an automatic focus adjusting device

Details Camera system having an automatic focus adjusting device Camera system having an automatic focus adjusting device

1989-02-21

1991-07-30

Hix, L. T.

35419512, G03B 300, G03B 1318

Patent

active

050363484

ABSTRACT:
A camera includes a photo-taking optical system having a focusing lens movable in the direction of the optic axis for focus adjustment, a drive device for moving the focusing lens in the direction of the optic axis, a pulse generator means generating a pulse signal for each predetermined amount of movement of the focusing lens in the direction of the optic axis, a counter for counting the pulse signal, a memory, an electric power supply means for supplying electric power to the counter and a switch operated to stop and start the supply of electric power from the electric power supply to the counter. The counter is responsive to the operation of the switch for stopping the supply of electric power to write the content of the counter into the memory, and responsive to the operation of the switch for starting the supply of electric power to read the content of the memory. The counter counts the pulse signal on the basis of the read content of the memory.

REFERENCES:
patent: 4199244 (1983-04-01), Shenk

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