Focusing torque control device for lens barrel

Details Focusing torque control device for lens barrel Focusing torque control device for lens barrel

1992-05-20

1994-04-19

Hayes, Monroe H.

Optical: systems and elements

Prism

With reflecting surface

354286, 3542891, 359700, 359823, G03B 118

Patent

active

053050363

ABSTRACT:
A focusing torque control device for a lens barrel includes a rotating unit, rotatable in association with a lens included in the lens barrel, an engaging pin by which the rotating unit is engaged, and a frictional force unit. The lens is moved along an optical axis thereof when the rotating unit is rotated. The frictional force control unit controls a frictional force between the rotating unit and the engaging pin by controlling a pressure force pressing the engaging pin against the rotating unit.

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patent: 4299453 (1981-11-01), Momiyama
patent: 4309077 (1982-01-01), Tomori
patent: 5052781 (1991-10-01), Iizuka
English Language Abstract of Japanese Publication No. 62-273504.
Partial Translation of pp. 13 & 14 Marked by Brackets of Japanese Publication No. 62-273504.

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