Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-02-11
1998-04-07
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 4423, 369112, G11B 709
Patent
active
057372977
ABSTRACT:
A light radiated from a light source is divided by a grating into a main beam for detecting information signals and sub-beams for tracking, and thus irradiates a mini disk. The beams reflected by the mini disk are converged through a concave cylindrical mirror on a second light detector composed of adjacently disposed divided light receiving elements H (light receiving parts A and B) and J (light receiving parts C and D) and light receiving elements E1, F1, E2 and F2. The concave cylindrical mirror shapes the reflected beams so that spots of the reflected beams converged on the second light detector take elliptic shapes that are flattened in a direction in which the main beam for detecting the information signals and the sub-beams for tracking are arranged. In this manner, reliability of an optical head can be improved without increasing the size of the light receiving elements and without causing interference between a main spot and sub-spots.
REFERENCES:
patent: 5202869 (1993-04-01), Miyake et al.
patent: 5629916 (1997-05-01), Komiya
patent: 5648946 (1997-07-01), Yamazaki
Ikeda Kenji
Katayama Hiroshi
Mashiyama Tomio
Ogata Nobuo
Chu Kim-Kwok
Epps Georgia Y.
Sharp Kabushiki Kaisha
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