Objective lens for an optical disc

Details Objective lens for an optical disc Objective lens for an optical disc

1984-03-19

1986-09-09

Corbin, John K.

350414, G02B 912, G02B 2102

Patent

active

046105158

ABSTRACT:
An objective lens for recording information on an optical disc at high density or reproducing it comprises, in succession from the farther conjugate point side of the objective lens toward the nearer conjugate point side, first lens member consisting of a negative lens whose concave surface is directed toward the farther conjugate point side and a positive lens cemented together, second lens member of a positive lens and third lens member of a positive meniscus lens whose convex surface is directed toward the farther conjugate point side. A numerical aperture of the objective lens is 0.45 to 0.6 and the working distance thereof is long.

REFERENCES:
patent: 2206195 (1940-07-01), Konig
patent: 3879111 (1975-04-01), Goto
patent: 4184747 (1980-01-01), Uetake

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