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
Ohki Hiroshi
Tanaka Masashi
Corbin John K.
Gass Rebecca D.
Nippon Kogaku K.K.
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