Wide aperture objective lens

Details Wide aperture objective lens Wide aperture objective lens

1980-10-31

1983-01-18

Corbin, John K.

G02B 934

Patent

active

043689574

ABSTRACT:
An objective lens comprising five lens elements and intended for use in an optical recording system wherein a laser beam is focused onto a recording surface located beneath a plastic layer over the disc. The disclosed lens has a relatively large numeric aperture of 0.75, but has a relatively large working distance between the lens and the disc and a relatively low total mass, to facilitate rapid movement of the lens. In addition, the lens is color corrected to accommodate a range of spectral frequencies present in the laser beam.

REFERENCES:
patent: 4240704 (1980-12-01), Goto
patent: 4257679 (1981-03-01), Okawa

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