Projection lens for projector

Details Projection lens for projector Projection lens for projector

1990-01-25

1991-09-17

Dzierzynski, Paul M.

Optical: systems and elements

Lens

Including a nonspherical surface

359649, B29D 1100

Patent

active

050489402

ABSTRACT:
A lens for a highly precise and fine projector that may response to a television of high quality must have a large aperture ratio and a wide field angle, and chromatic aberrations should be well corrected. A projector lens according to the present invention comprises, from a screen side, a first lens group including at least one positive single lens and negative single lens, a second lens group having a strong refracting power including one positive lens and negative lens, a third positive lens group having a relatively weak refracting power, and a fourth lens group having a negative lens with a concave surface having a strong curvature directed toward the screen, characterized in that the third lens group has at least one aspherical surface.

REFERENCES:
patent: 4770513 (1988-09-01), Fujie et al.
patent: 4900139 (1990-02-01), Kreitzer
patent: 4924244 (1990-05-01), Kataoka et al.
patent: 4963007 (1990-10-01), Moskovich

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