Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-03-18
1997-10-21
Tran, Thang V.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4412, 369 4414, G11B 7135
Patent
active
056803850
ABSTRACT:
It is the object of the invention to provide an optical head, which can be assembled with high accuracy and operates with high stability. A laser diode is fixed on a heat sink, which is fixed on the photodiode chip. The laser diode chip emits the light in the both forward and backward directions. A mirror, which reflects the forward emitted light, are formed on a heat sink. The forward emitted light is reflected by the mirror, passes through a holographic optical element and a lens, and is focused on an optical disc (not shown). The reflected light from the optical disc proceeds along the same path in the opposite direction, is diffracted by the holographic optical element, and detected by the light detecting portions 2a to 2h on the photodiode chip. In order to control an injection current and keep the power of the emitted light constant, the backward emitted light is detected by the light detecting portion 2i on a photodiode chip 2.
REFERENCES:
patent: 5406543 (1995-04-01), Kobayashi et al.
patent: 5446719 (1995-08-01), Yoshida et al.
patent: 5546371 (1996-08-01), Miyazaki
"Application of Flip-Chip Bonding Method to Optical Heads" Nagano et al; 12th meeting on Lightwave Sensing Technology, Japanese Society of Lightware Sensing Technology, Japanese Society of Applied Physics, pp. 103-109.
NEC Corporation
Tran Thang V.
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