Lens

Details Lens Lens

1989-12-21

1991-05-07

Arnold, Bruce Y.

G02B 302

Patent

active

050131435

ABSTRACT:
A lens or lens system for use in reading optical data has as one component a pickup lens having finite or infinite conjugates. The pickup lens is biaspheric where the surfaces may have spherical, paraboloidal or general conic base curves and higher order correction terms up to 40th order when required. Various methods of making such a lens of plastics material are also disclosed.

REFERENCES:
patent: 4571034 (1986-02-01), Nakamura

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