Lens system for use in optical information device

Details Lens system for use in optical information device Lens system for use in optical information device

1988-12-16

1991-09-24

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With graded refractive index

359794, G02B 300

Patent

active

050509705

ABSTRACT:
A two-group two-element lens system for use in an optical information device includes a first lens adapted to be positioned closer to a light source and having a flat surface which is symmetric with respect to an optical axis thereof and a convex surface which is symmetric with respect to the optical axis, the first lens being made of a medium having a refractive index distribution along the optical axis, and a second lens adapted to be positioned closer to an image and having a spherically convex surface closer to the light source, the second lens having a positive refracting power as a whole and made of a medium having a uniform refractive index.

REFERENCES:
patent: 4457590 (1984-07-01), Moore
patent: 4613212 (1986-09-01), Norikazu
patent: 4701032 (1987-10-01), Takada
patent: 4730905 (1988-03-01), Takada
patent: 4758071 (1988-07-01), Mclaughlin et al.
patent: 4840467 (1989-06-01), Takada et al.
patent: 4880298 (1989-11-01), Takada
patent: 7755039 (1988-07-01), Hattori

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