Zoom lens locking system

Details Zoom lens locking system Zoom lens locking system

1981-12-16

1984-07-24

Corbin, John K.

350255, G02B 704, G02B 1500

Patent

active

044615450

ABSTRACT:
A locking system is provided for selectively locking the operating ring of a zoom lens against axial displacement to secure optical elements of the zoom lens in a selected position of magnification adjustment. The locking system comprises a ratchet carried by the operating ring and urged by a spring into locking engagement with a toothed rack mounted on the zoom lens housing to lock the operating ring in a selected axial position of adjustment. A control pin is movable upon depression of a spring-biased button to engage the ratchet and move it away from engagement with the toothed rack to permit axial displacement of the operating ring to an alternative magnification setting. In one embodiment of the invention, a lock-release switch selectively maintains the ratchet away from engagement with the rack.

REFERENCES:
patent: 3277783 (1966-10-01), Eggert
patent: 3970368 (1976-07-01), Von Belvard
patent: 3970370 (1976-07-01), Kawai
patent: 4229074 (1980-10-01), Nonogaki

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