Astigmatism generator

Details Astigmatism generator Astigmatism generator

1987-10-01

1989-02-21

Henry, Jon W.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

350173, 350171, 350399, 369112, 369 45, 250204, G02B 504, G02B 2710, G11B 7135

Patent

active

048059927

ABSTRACT:
An astigmatism generator such as may be used in the pickup of an optical disk player which produces substantially no other aberrations yet which can be manufactured at a low cost. The astigmatism generator is fabricated from a plate having four plane surfaces, including a first surface through which light is introduced, a second surface parallel to the first surface and through which the light exits, and a third surface by which light transmitted through the first surface is reflected toward the second surface. The third surface is arranged at an oblique angle to the first and second surfaces and is selected such that almost all coma is eliminated from the light passing through the second surface.

REFERENCES:
patent: 4287413 (1981-09-01), Kanamura
patent: 4290132 (1981-09-01), Kotaka
patent: 4358260 (1982-11-01), Heemskerk et al.
patent: 4724533 (1988-02-01), Ohara et al.
patent: 4731527 (1988-03-01), Nomura et al.

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