Rotary feed mechanism for lens barrel of compact zoom camera

Details Rotary feed mechanism for lens barrel of compact zoom camera Rotary feed mechanism for lens barrel of compact zoom camera

1995-10-10

1997-06-17

Blankenship, Howard B.

Photography

Having variable focal length of camera objective

359704, G03B 118, G02B 702

Patent

active

056406150

ABSTRACT:
A rotary feed mechanism includes inner and outer annular members which are engaged through male and female multiple threads. A circumferential engaging land is formed on an outer peripheral surface of the inner annular member. A plurality of inclined gears are inclined in the same direction as the male multiple thread and formed on the engaging land. At least one thread, which constitutes a part of the male multiple thread, is provided between each of the inclined gears. A plurality of pinion shafts are arranged in parallel with an axis of the inner and outer annular members and rotate the inner annular member with respect to the outer annular member. A plurality of separate pinions are provided on each pinion shaft. The pinions have a width which successively engages the inclined gears in accordance with the axial position of the inner annular member. A mechanism drives the pinion shafts in the same direction. The pinion shafts are offset along the optical axis, so that the inclined gears can engage the pinions on at least one of the shafts regardless of the axial position of the inner annular member.

REFERENCES:
patent: 4252411 (1981-02-01), Nomura
patent: 5144493 (1992-09-01), Nomura
patent: 5164757 (1992-11-01), Nomura
patent: 5386740 (1995-02-01), Nomura et al.
patent: 5446593 (1995-08-01), Hamasaki et al.
patent: 5488513 (1996-01-01), Tanaka

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