Objective for video disks

Details Objective for video disks Objective for video disks

1976-06-11

1977-09-06

Corbin, John K.

350175ML, G02B 960

Patent

active

040464601

ABSTRACT:
An objective for video disks comprising five lens components of single lenses for which the numerical aperture on the recording surface side is large, working distance is large and aberrations especially spherical aberration and coma are corrected favourably. Besides, said objective for video disks is arranged so that it can be used also for rays from infinite distance by varying an airspace between a second and third lens components.

REFERENCES:
patent: 1791276 (1931-02-01), Konig
patent: 3887269 (1975-06-01), Nakagawa

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