Lens system for optically recorded disks

Details Lens system for optically recorded disks Lens system for optically recorded disks

1982-11-12

1985-06-18

Corbin, John K.

350414, G02B 960, G02B 2102

Patent

active

045238170

ABSTRACT:
A lens system for optically recorded disks comprising a first, second, third and fourth lens components in the order from the light-source side, the first lens component having positive refractive power, the second lens component having negative refractive power, the third lens component having positive refractive power, the fourth lens component having positive refractive power, the lens system for optically recorded disks having a large N.A., long working distance and wide field angle.

REFERENCES:
patent: 4046460 (1977-09-01), Koizumi
patent: 4065205 (1977-12-01), Fleischman
patent: 4073575 (1978-02-01), Koizumi
patent: 4206977 (1980-06-01), Goto
patent: 4256374 (1981-03-01), Mickleson
patent: 4257679 (1981-03-01), Okawa
patent: 4332442 (1982-06-01), Ookawa

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