Zoom lens, video enlarging/projecting system, video...

Details Zoom lens, video enlarging/projecting system, video... Zoom lens, video enlarging/projecting system, video...

2008-01-08

2008-01-08

Hasan, M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S692000

Reexamination Certificate

active

07317582

ABSTRACT:
The present invention includes three or more lens groups. These are arranged in the order of a first lens group (11) that has positive refractive power and a second lens group (12) that has negative refractive power, as seen from the side having the longer conjugate distance, wherein a first lens (12a) of the lenses of the second lens group (12), as seen from the side having the longer conjugate distance, has positive refractive power. Thus, it is possible to suppress distortion aberration to a small value.

REFERENCES:
patent: 4824236 (1989-04-01), Ueda
patent: 5835285 (1998-11-01), Matsuzawa et al.
patent: 5930049 (1999-07-01), Suenaga et al.
patent: 6028715 (2000-02-01), Takamoto et al.
patent: 2002/0024708 (2002-02-01), Lewis et al.
patent: 62-237415 (1987-10-01), None
patent: 2-48623 (1990-02-01), None
patent: 7-325272 (1995-12-01), None
patent: 10-161027 (1998-06-01), None
patent: 11-109227 (1999-04-01), None
patent: 2001-215411 (2001-08-01), None
patent: 2002-131636 (2002-05-01), None
patent: 2002-131639 (2002-05-01), None
patent: 2002-296501 (2002-10-01), None

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