Collimator lens of erasable and re-recordable magneto-optical di

Details Collimator lens of erasable and re-recordable magneto-optical di Collimator lens of erasable and re-recordable magneto-optical di

1990-06-11

1992-02-11

Sugarman, Scott J.

Optical: systems and elements

Lens

Multiple component lenses

G02B 906

Patent

active

050879901

ABSTRACT:
A collimator lens for an erasable and re-recordable magneto-optical disk system comprising a first positive lens, a second positive lens and a third negative lens arranged from a light outgoing side in order. The second and third lenses are cemented together and the cemented lens has a positive power. A refractive index of the first lens n1 is lower than 1.686.

REFERENCES:
patent: 2405301 (1946-08-01), Gray

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