OPTICAL HEAD

Japanese Patent JP3458024

B2

PROBLEM TO BE SOLVED: To obtain a magneto-optical signal with a high C/N and to enhance the degree of freedom in optical design by suppressing the loss of signal component to the minimum.
SOLUTION: A magneto-optical recording medium 8 is irradiated with the light emitted from a semiconductor laser 1 through a hologram 5 and a convergence means 4 after the light is reflected by a polarizing film 3 provided on the first surface 2a of a prism 2 consisting of a uniaxial refringence crystal. The return light is made incident on the first, second hologram areas 5a, 5b of the hologram 5 through the convergence means 4, and the ±1st-order diffraction light caused there are imparted with focal power different from each other, and are received by a first photodetector 6 before/after the convergent position, and an error signal is detected. Then, the zero-order light is made to pass through the polarizing film 3, and further, is made to pass and diffracted through the prism 2 to be separated into normal light having astigmatism and abnormal light, and these normal light and abnormal light are emitted from the second surface 2b of the prism 2, and received by a second photodetector 7 arranged in the vicinity of the focal line position of the astigmatism, and the magneto-optical signal is detected.

JP2003085763	REPRODUCING DEVICE AND REPRODUCING METHOD
JPH04245043	MAGNETO-OPTICAL DATA PLATE BODY HAVING PLATINUM-CONTAINING READING LAYER
JPS63302445	MAGNETO-OPTICAL RECORDING MEDIUM

Ken Yamazaki
Akihei Kobayashi
Hiroyuki Imabayashi
Masaaki Komiya

JP19731695A

October 20, 2003

August 02, 1995

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Olympus Optical Co., Ltd.

G11B11/105; G11B7/09; G11B11/10; (IPC1-7): G11B11/105; G11B7/09

JP7311990A
JP344831A
JP5298721A

Kosugi Sugimura (4 others)

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