Lens barrel and optical apparatus

Details Lens barrel and optical apparatus Lens barrel and optical apparatus

1999-03-12

1999-12-14

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359699, G02B 1514

Patent

active

06002531&

ABSTRACT:
In a lens barrel or an optical apparatus using the lens barrel, a first holding frame which holds a first lens and a second holding frame which holds a second lens are arranged to engage one and the same cam member, a cam disposed in the cam member is arranged to move the first and second holding frames along an optical axis, while keeping the relative positions of the first and second holding frames unvaried when shooting is not performed, and the second holding frame is moved in the direction of the optical axis while the first holding frame is kept stationary in the direction of the optical axis when shooting is performed. The first lens is located nearest to an object side within the lens barrel while the second lens is arranged to be movable along the optical axis for varying a magnifying power.

REFERENCES:
patent: 4920369 (1990-04-01), Kaneda et al.
patent: 4999656 (1991-03-01), Shimizu et al.
patent: 5060001 (1991-10-01), Kaneda
patent: 5134525 (1992-07-01), Kaneda
patent: 5164757 (1992-11-01), Nomura
patent: 5264966 (1993-11-01), Okaka et al.
patent: 5363248 (1994-11-01), Horio
patent: 5486888 (1996-01-01), Shiina et al.

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