Optical device with inherent focusing error correction

Details Optical device with inherent focusing error correction Optical device with inherent focusing error correction

1992-07-15

1994-11-22

LaRoche, Eugene R.

Optical: systems and elements

Lens

With variable magnification

359696, 359697, 354400, 355 55, 355 56, 355 57, G03B 1336, G03B 2734

Patent

active

053674065

ABSTRACT:
In an imaging apparatus, provided is an optical device which is capable of changing the magnifying power thereof. The optical device includes a zoom lens system having a power varying lens group and a correction lens group both of which are movable in the direction of the optical axis of the zoom lens system with respect to the zoom lens system. The zoom lens system is moved in the direction of the optical axis of the zoom lens system, and the power varying lens is driven synchronously with the movement of the zoom lens system. Further, the zoom lens system and the correction lens are moved in accordance with a magnifying power and data representing the amount of the displacement of the zoom lens system respective to the optical axis and the displacement of the correction lens with respect to the optical system.

REFERENCES:
patent: 4322159 (1982-03-01), Takahashi
patent: 4412737 (1983-11-01), Iwanade et al.
patent: 4420248 (1983-12-01), Ogawa
patent: 4557593 (1985-12-01), Iwanade
patent: 4627720 (1986-12-01), Yonemori
patent: 4825252 (1989-04-01), Suzuki et al.
patent: 4974948 (1990-12-01), Arai et al.
patent: 5005037 (1991-04-01), Akashi
patent: 5060001 (1991-10-01), Kaneda
patent: 5117256 (1992-05-01), Haibara

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