Fisheye lens unit

Details Fisheye lens unit Fisheye lens unit

2007-10-16

2007-10-16

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Panoramic

C359S749000

Reexamination Certificate

active

11411658

ABSTRACT:
To provide a technique to constitute a fisheye lens unit with a small number of lenses. A fisheye lens unit uses a predetermined projection method, wherein a variation for the predetermined projection method is not less than the variation for an equidistant projection method, the variation being expressed by an increment of an image height in relation to an increment of an incident angle at a predetermined incident angle. The fisheye lens unit includes: a first lens group provided on an object side; a second lens group provided on an image side; and an aperture stop provided between the first lens group and the second lens group. The first lens group consists of three or four lenses, the second lens group consists of two or three lenses including a final lens provided on the furthest image side of the second lens group, and the final lens is an aspheric lens that has an aspheric shape on at least one of two surfaces of the aspheric lens.

REFERENCES:
patent: 4525038 (1985-06-01), Muller
patent: 5434713 (1995-07-01), Sato
patent: 5724193 (1998-03-01), Hirakawa
patent: 6987623 (2006-01-01), Shibayama
patent: 7023628 (2006-04-01), Ning
patent: 2002-244031 (2002-08-01), None
patent: 2003-232998 (2003-08-01), None
patent: 2004-102162 (2004-04-01), None
patent: 2005-227426 (2005-08-01), None

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