Focus adjusting device for binocular

Details Focus adjusting device for binocular Focus adjusting device for binocular

1983-08-15

1986-04-22

Corbin, John K.

G02B 702

Patent

active

045838283

ABSTRACT:
A binocular belonging to one type is provided with a focus adjusting device which allows one to select a desired ocular lens feed rate. A single annular piece is included in the device to be rotated by a manually operated focus adjusting ring to in turn drive a shaft associated with ocular lens barrels in a reciprocal movement. A bunch of such exchangeable annular pieces are prepared each being formed with a helical slot which differs in pitch from helical slots in the others.

REFERENCES:
patent: 782553 (1905-02-01), Glocker
patent: 4066329 (1978-01-01), Van Exel
patent: 4240690 (1980-12-01), Kimura
patent: 4262990 (1981-04-01), Kamakura

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