System and methods for providing a zoom lens device

Details System and methods for providing a zoom lens device System and methods for providing a zoom lens device

2005-05-17

2005-05-17

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S677000, C359S679000, C359S684000, C359S686000, C359S694000, C359S699000, C359S701000, C359S703000, C359S704000

Reexamination Certificate

active

06894845

ABSTRACT:
The invention provides a zoom lens device that can include lens groups. A third lens group (compensator lens group) can be disposed between two lens groups (a second and a fourth lens groups) forming a variator lens group. The two lens groups (the second and fourth lens groups) forming the variator lens group can be retained by a common variator-lens frame and moved together. Accordingly, a zoom lens device, an optical apparatus, and a projector can be provided in which, even when a plurality of lens groups are assembled, degradation of optical characteristics due to decentering between the lens groups can be prevented.

REFERENCES:
patent: 5000549 (1991-03-01), Yamazaki
patent: 5880892 (1999-03-01), Ohtake
patent: 6075653 (2000-06-01), Narimatsu et al.
patent: 6151171 (2000-11-01), Kenin et al.
patent: U 63-88811 (1988-06-01), None
patent: A 1-219810 (1989-09-01), None
patent: A 4-345118 (1992-12-01), None
patent: A 5-66335 (1993-03-01), None
patent: A 7-84170 (1995-03-01), None

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