Optical read-out lens system for optically recorded disks

Details Optical read-out lens system for optically recorded disks Optical read-out lens system for optically recorded disks

1982-08-24

1984-11-27

Corbin, John K.

350414, G02B 934

Patent

active

044848021

ABSTRACT:
An optical read-out lens system for optically recorded disks comprising a first, second, third and fourth lenses in which the first lens is a positive lens, the second lens is a negative lens, the third lens is a positive lens and the fourth lens is a positive meniscus lens, the optical read-out lens system comprising a small number of lenses, being light in weight and having large NA and long working distance.

REFERENCES:
patent: 4257679 (1981-03-01), Okawa
patent: 4332442 (1982-06-01), Okawa

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