Lens system for optical recording type disks

Details Lens system for optical recording type disks Lens system for optical recording type disks

1983-06-07

1985-06-25

Corbin, John K.

350432, G02B 302, G02B 906

Patent

active

045250405

ABSTRACT:
A lens system for optical recording type disks comprising a first lens and a second lens wherein the first lens is a positive lens and the second lens is a positive lens, the lens system for optical recording type disks being arranged that the entrance surface of the first lens is an aspherical surface, the working distance is long and aberrations are corrected favorably.

REFERENCES:
patent: 3877792 (1975-04-01), Cox et al.
patent: 4002406 (1977-01-01), Sussman

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