Objective lens for optical disc

Details Objective lens for optical disc Objective lens for optical disc

1984-03-19

1986-02-25

Corbin, John K.

350410, 350414, G02B 906, G02B 2102

Patent

active

045726230

ABSTRACT:
An objective lens for detecting information recorded on an optical disc at high density, comprises, in succession from farther conjugate point side of the objective lens toward nearer conjugate point side, first lens composed of a positive lens and a negative lens cemented together and having a positive total refractive power, and second lens of a positive meniscus lens whose concave surface faces toward the nearer conjugate point side. The objective lens further satisfies the certain conditions.

REFERENCES:
patent: 1620339 (1927-03-01), Frederick et al.
patent: 4270843 (1981-06-01), Goto
patent: 4484803 (1984-11-01), Arai

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