High-aperture wide angle cinema projection lens

Details High-aperture wide angle cinema projection lens High-aperture wide angle cinema projection lens

2006-06-06

2006-06-06

Dang, Hung Xuan (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S754000

Reexamination Certificate

active

07057830

ABSTRACT:
A projection lens with a short focal length and high initial aperture is proposed. Such projection lenses are used, for example, in cinema projection. The projection lens is configured such that the sum of the overall length and the back focus (12) is between 2.8 times and 4.5 times the total focal length f′. The entrance pupil is at a distance of between 100 mm and 300 mm from the last lens surface (62; 150), which faces the illuminating mirror. The minimum stop number k of the projection lens is 1.7, and the projection lens is therefore also suitable for illuminating mirrors with a high aperture angle (of up to 17°).

REFERENCES:
patent: 5798874 (1998-08-01), Yamamoto
patent: 6437926 (2002-08-01), Mori
patent: 6795255 (2004-09-01), Reinecke et al.
patent: 24 36 444 (1976-02-01), None
patent: 36 33 032 (1987-06-01), None
patent: 42 12 067 (1993-10-01), None
patent: 1134 606 (2002-04-01), None
patent: 1 215 519 (2002-06-01), None
patent: 1 489 451 (2004-12-01), None
patent: 2 185 128 (1987-07-01), None
patent: 2002341242 (2002-11-01), None

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