Variable focusing lens barrel

Details Variable focusing lens barrel Variable focusing lens barrel

1988-02-04

1989-07-18

Arnold, Bruce Y.

350430, 354400, G02B 710, G02B 1500

Patent

active

048488844

ABSTRACT:
A variable focus lens barrel in which a variable power drive frame has a plurality of cam grooves which each receive a cam pin provided on each of movable frames to which a lens group is each fixed, the variable power drive frame being driven by a motor to perform variable power drive, wherein a balanced groove is formed at each of both ends of a variable power drive range of each of the cam grooves formed in the variable power drive frame such that the balanced groove extends circumferentially of the variable power drive frame over a predetermined angular range from each end, and wherein each of the movable frames does not move in the direction of the optical axis in a rotational area of the variable power drive frame in which each of cam pins slides in the corresponding balanced groove.

REFERENCES:
patent: 4083057 (1978-04-01), Quinn
patent: 4421389 (1983-12-01), Muryoi

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