Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1988-02-02
1990-06-26
Canney, Vincent P.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4411, 350 9612, 350 9618, G02B 612, G11B 7135
Patent
active
049378082
ABSTRACT:
An optical head including a substrate, an optical waveguide formed on the substrate, a light source formed on a portion of the substrate, a collimator lens for converting light from the light source into parallel light rays, an objective lens for focusing light from the collimator lens onto a recording medium and for converting reflected light from the recording medium into parallel light rays, a beam splitter for dividing light from the objective lens into two parts to send out one of the parts in a predetermined direction, a coupling lens for focusing light from the beam splitter on a position, and a photodetector for detecting light from the coupling lens, is disclosed, in which the collimator lens, the objective lens, the beam splitter, the coupling lens and the photodetector are integrated on the substrate, and the collimator lens or an objective lens supporting part is made flexible to vary the position of the focus of the collimator lens or objective lens by piezo-electric elements.
REFERENCES:
patent: 4718052 (1988-01-01), Kondo et al.
patent: 4737946 (1988-04-01), Yamoshita
patent: 4778991 (1988-10-01), Nozaki et al.
Translation of Japanese Patent Laid-Open Publication No. 60-129938 (Summary).
Ibamoto Masahiko
Koyanagi Hiroaki
Minemura Hiroyuki
Miyamoto Norifumi
Ohyama Shinji
Canney Vincent P.
Hitachi , Ltd.
Tomassini James E.
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