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

1982-06-22

1984-09-18

Corbin, John K.

G02B 934

Patent

active

044720343

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 negative meniscus lens, the second lens is a positive lens, the third lens is a positive lens and the fourth lens is a positive meniscus lens, the optical read-out lens system being arranged that the working distance is long and offaxial aberrations are corrected favorably and, moreover, arranged to be small in size, light in weight and low in price.

REFERENCES:
patent: 4101204 (1978-07-01), Koizumi et al.

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