Zoom lens of retrofocus type

Details Zoom lens of retrofocus type Zoom lens of retrofocus type

1998-07-28

2000-06-27

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359676, 359570, G02B 1514, G02B 518

Patent

active

06081389&

ABSTRACT:
A zoom lens of the retrofocus type includes, in order from a longer-distance conjugate point side to a shorter-distance conjugate point side, a front lens unit of negative refractive power, and a rear lens unit of positive refractive power, wherein a separation between the front lens unit and the rear lens unit varies according to variation of magnification, and at least one of the front lens unit and the rear lens unit is provided with a diffractive optical element.

REFERENCES:
patent: 4776679 (1988-10-01), Kitagishi et al.
patent: 4802747 (1989-02-01), Horiuchi
patent: 4810070 (1989-03-01), Suda et al.
patent: 4842386 (1989-06-01), Kitagishi et al.
patent: 4854684 (1989-08-01), Horiuchi
patent: 4892397 (1990-01-01), Horiuchi
patent: 4907866 (1990-03-01), Kitagishi et al.
patent: 4934796 (1990-06-01), Sugiura et al.
patent: 4988174 (1991-01-01), Horiuchi et al.
patent: 5011272 (1991-04-01), Nakayama et al.
patent: 5044706 (1991-09-01), Chen
patent: 5050972 (1991-09-01), Mukaiya et al.
patent: 5056900 (1991-10-01), Mukaiya et al.
patent: 5078481 (1992-01-01), Nakayama et al.
patent: 5087988 (1992-02-01), Nakayama
patent: 5095387 (1992-03-01), Horiuchi
patent: 5111338 (1992-05-01), Nakayama
patent: 5113287 (1992-05-01), Nakayama
patent: 5138492 (1992-08-01), Hamano et al.
patent: 5179473 (1993-01-01), Yano et al.
patent: 5225937 (1993-07-01), Horiuchi
patent: 5268790 (1993-12-01), Chen
patent: 5321552 (1994-06-01), Horiuchi et al.
patent: 5353157 (1994-10-01), Horiuchi
patent: 5493441 (1996-02-01), Chipper
patent: 5583699 (1996-12-01), Nakayama
patent: 5612825 (1997-03-01), Horiuchi et al.
patent: 5638216 (1997-06-01), Horiuchi et al.
patent: 5739961 (1998-04-01), Nakayama et al.
patent: 5754346 (1998-05-01), Nakayama et al.
patent: 5847882 (1998-12-01), Nakayama
patent: 5875059 (1999-02-01), Estelle
patent: 5875060 (1999-02-01), Umeda
Y. Matsui, "Lens Design Methods", Kyoritsu Shuppan Publishing Co. Ltd., Japan, p. 98 (1972).
Professor G. Michael Morris, "Diffractive Optics: From Basic Research to Practical Applications", in International Optical Design Conference 1998, Leo R. Gardner, Kevin P. Thompson, Editors, Proceedings of SPIE vol. 3482, 590-593 (Jun. 12, 1998).

Affiliated with

Also associated with

Rating

Zoom lens of retrofocus type does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zoom lens of retrofocus type, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens of retrofocus type will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1789280