Objective for video disks

Details Objective for video disks Objective for video disks

1978-11-21

1980-12-23

Sacher, Paul A.

G02B 934

Patent

active

042407044

ABSTRACT:
An objective for video disks comprising a first, second, third and fourth lenses in which the first lens is a biconvex lens, the second lens is a negative lens, the third lens is a positive lens, and the fourth lens is a positive lens and for which N.A. is large and aberrations such a spherical aberration, astigmatism, etc. are corrected favorably.

REFERENCES:
patent: 1967836 (1934-07-01), Merte
patent: 2536508 (1951-01-01), Lotmar
patent: 3989317 (1976-11-01), Maeda
patent: 4046460 (1977-09-01), Koizumi

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