Magneto-optical recording/reproducing pickup head with a diffrac

Details Magneto-optical recording/reproducing pickup head with a diffrac Magneto-optical recording/reproducing pickup head with a diffrac

1994-09-29

1996-04-16

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 13, 369112, 369110, 369 4437, 369 4423, 369120, G11B 708, G11B 7135, G11B 1110

Patent

active

055089925

ABSTRACT:
A light source for generating light beams, a diffraction grating for splitting the light beam emitted from the light source into at least three light beams, and an objective lens for receiving the reflecting light beams from the recording medium, the magnification of the objective lens being -6.0 to -12.0, make up a collimatorless optical system. The reflecting light beams emanating from the objective lens are split by a beam splitter, these split light beams are each split into at least three light beams by a Wollaston prism, and are incident on a photo detecting element. A tracking error signal, a focusing error signal, and a magneto-optical signal are generated using the light beams received by the photo detecting element. The beam splitter and the Wollaston prism may be substituted by a multifunctional Wollaston prism. If the nine split light beams are all received by the photo detecting element, the signals produced by the photo detecting element are large in amplitude.

REFERENCES:
patent: 5073888 (1991-12-01), Takahashi et al.
patent: 5095472 (1992-03-01), Uchino et al.
patent: 5315574 (1994-05-01), Saimi et al.
patent: 5394381 (1995-02-01), Fukumoto et al.
"O plus E", No. 163, Jun. 1993, pp. 93-98.

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