Lens barrel

Details Lens barrel Lens barrel

1995-08-30

1999-01-12

Lee, Eddie C.

Photography

Having variable focal length of camera objective

396 75, 396 79, G03B 1700

Patent

active

058600302

ABSTRACT:
In a new retractable lens barrel of a type wherein a movable barrel is mounted protrudably in an optical axis direction from a fixed barrel or a camera body and filming is possible when the movable barrel is in a protruded state and comprising a movable lens of a variable power and/or focusing system, a space formed when the movable barrel is protruded from the fixed barrel or camera body is made a space in which the movable lens is movable during filming and the casing of the iris unit and a lens holder of a fixed lens are formed integrally. Because the space in which the movable lens is movable during filming is used to accommodate the movable barrel when the camera is not being used and the movable barrel is retracted, the length of the retracted lens barrel in the front-rear direction can be made short. Also, because the casing of the iris unit and the lens holder of a fixed lens are formed integrally, the number of parts is reduced and the optical axes of different lens groups and the iris unit are not readily misaligned when the lens barrel is being assembled.

REFERENCES:
patent: 4721972 (1988-01-01), Wakabayashi
patent: 4843411 (1989-06-01), Wakabayashi et al.
patent: 4993815 (1991-02-01), Yamazaki et al.
patent: 5153626 (1992-10-01), Yamamoto
patent: 5212509 (1993-05-01), Kosako et al.
patent: 5287223 (1994-02-01), Hirasawa

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