Projection-lens system

Details Projection-lens system Projection-lens system

1985-05-13

1991-05-21

Dzierzynski, Paul M.

350417, B29D 1100

Patent

active

050169947

ABSTRACT:
A projection-lens system for projecting a magnified image of a scene formed by means of a reproduction element onto a projection screen, which system has two correction groups and one main group which provides substantially the entire power of the system. The main group includes a glass preform of which at least one of the outer surfaces is provided with a layer of a transparent plastics having an aspheric outer profile. This projection-lens system is substantially temperature-independent, provides a satisfactory correction for aberrations, and has a short focal length and a comparatively large numerical aperture.

REFERENCES:
patent: 3917766 (1975-11-01), Howden
patent: 4027952 (1977-06-01), Hughes
patent: 4564269 (1986-01-01), Uehara

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