Projection lens

Details Projection lens Projection lens

1999-06-08

2000-09-05

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359754, 359755, 359756, 359649, G02B 936

Patent

active

061151947

ABSTRACT:
By satisfying certain specified conditions, a projection lens having six lens groups and a low F-number of 1.4 is disclosed wherein a maximum angle between a principal ray and the optical axis on the reducing side of the projection lens is 2.5.degree. or less. This enables the projection lens to be used with a display which must be illuminated by light that is orthogonal to a display surface (as is the case with a liquid crystal display) without significant loss of light at the periphery of the image. Further, the projection lens can have its aberrations favorably corrected and be compact.

REFERENCES:
patent: 2687063 (1954-08-01), Coleman
patent: 3909115 (1975-09-01), Kano
patent: 5831770 (1998-11-01), Matsuzawa et al.

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