Drive apparatus for zoom lens barrel

Details Drive apparatus for zoom lens barrel Drive apparatus for zoom lens barrel

1997-12-11

1999-06-01

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359699, G02B 1514

Patent

active

059093200

ABSTRACT:
A drive apparatus for a zoom lens barrel having at least two movable lens groups, one of which is used also as a focusing lens group comprising: a pair of lens frames which respectively hold the two movable lens groups, a pair of driven pins which are integrally provided on the lens a drive cam plate which is provided with a pair of cam surfaces which engage with the corresponding driven pins and which is rotatable about an axis, a rack plate which is supported to move in the optical axis direction of the movable lens groups and which is provided with an engaging portion which engages with the driven pin of the movable lens group that is used also as a focusing lens group, a first drive mechanism which includes a first motor for swinging the drive cam plate in the forward and reverse directions, and a second drive mechanism which includes a second motor for moving the rack plate without having an influence on the angular position of the drive cam plate.

REFERENCES:
patent: 4914461 (1990-04-01), Hori
patent: 5113261 (1992-05-01), Morisawa
patent: 5140468 (1992-08-01), Kayanuma
patent: 5196963 (1993-03-01), Sato et al.
patent: 5266992 (1993-11-01), Takaoka et al.
patent: 5485236 (1996-01-01), Arai et al.

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