Magneto-optical head with a three prism beam splitter to split a

Details Magneto-optical head with a three prism beam splitter to split a Magneto-optical head with a three prism beam splitter to split a

1994-12-15

1996-04-23

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369110, 369 4423, 369 13, G11B 700

Patent

active

055110606

ABSTRACT:
An optical system of reflected light path of a magneto-optical head, comprising very few parts that can be easily manufactured and assembled at a low cost. The present invention makes use of a beam splitter and a plane convex lens to simplify the optical system of a magneto-optical head such that the reflected beam coming from the plane convex lens is split into three light beams by the beam splitter. Among the three split light beams, two are reflected beams used for focus and track photodetection, and the other is a transmitted beam used for RF signal photodetection. A magneto-optical head with an optimized design as such can reduce the cost of manufacture and assembly. Due to the simplicity in structure, the optical parts according to the present invention can be assembled easily.

REFERENCES:
patent: 4873678 (1989-10-01), Nakamura et al.
patent: 5060212 (1991-10-01), Fujita et al.
patent: 5231620 (1993-07-01), Ohuchida
patent: 5406532 (1995-04-01), Nishikawa
patent: 5467336 (1995-11-01), Ando et al.
Polarized Light;, Production and Use Cap. 5 Birefringence Polarizers, pp. 70-71; Author: Schurcliff, William A.; Harvard University Press, 1962.

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