Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1994-04-12

1997-09-16

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359699, 359700, 359701, B02B 1514

Patent

active

056686706

ABSTRACT:
A zoom lens barrel in which a zoom lens is switched to a plurality of focal lengths by a moving member by which a plurality of lens groups are moved in the direction of optical axis. After a desired focal length has been selected, a focusing operation is conducted by the moving member. At least two lens groups, which are moved for switching focal lengths, are moved while a distance between lens groups is being changed so that the focusing operation can be conducted.

REFERENCES:
patent: 4135786 (1979-01-01), Ikemori
patent: 4275952 (1981-06-01), Uesugi
patent: 4421389 (1983-12-01), Muryoi
patent: 4626076 (1986-12-01), Oshima
patent: 4750821 (1988-06-01), Yamamoto
patent: 4971427 (1990-11-01), Takamura
patent: 4990945 (1991-02-01), Cho
patent: 5170294 (1992-12-01), Haraguchi
patent: 5223873 (1993-06-01), Tsuboi
patent: 5301066 (1994-04-01), Higuchi
patent: 5333024 (1994-04-01), Labaziewicz
patent: 5416519 (1995-05-01), Ohtake
patent: 5488513 (1996-01-01), Tanaka
English language abstract of Japanese Patent Publication open to Public Inspection No. 287833/1988.
English language abstract of Japanese Patent Publication open to Public Inspection No. 248110/1991.
English language abstract of Japanese Patent Publication open to Public Inspection No. 259210/1986.

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