Projection lens

Details Projection lens Projection lens

2005-08-30

2005-08-30

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S708000

Reexamination Certificate

active

06937401

ABSTRACT:
A projection lens of the retrofocus type that has a long back focus and that can project with a high contrast, exhibits small aberrations and converts a light path inside the lens. A first lens set having a negative refractive power, a light path converter, and an iris and a second lens set having a positive refractive power and an aspheric lens are disposed in order from the screen side. The first lens set includes a lens set having a negative refractive power and one or more aspheric lenses, a bending mirror serving as the light path converter, and a lens set having a positive refractive power. The lenses in the first lens set have an outer shape with a portion thereof cut outside an effective light ray in a direction of the light path conversion, and the direction of the light path conversion is a direction of a shorter side of rectangular image formation element.

REFERENCES:
patent: 5303087 (1994-04-01), Hayakawa et al.
patent: 5390048 (1995-02-01), Miyatake et al.
patent: 5745297 (1998-04-01), Kaneko et al.
patent: 6473244 (2002-10-01), Sugano
patent: 0952474 (1999-10-01), None

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