Apparatus using an optical pickup

Details Apparatus using an optical pickup Apparatus using an optical pickup

1995-02-07

1996-10-15

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369121, 369103, 369109, 369 4412, G11B 700

Patent

active

055661424

ABSTRACT:
The present invention is directed to an apparatus using an integrated type pickup as an optical head for writing and reading optical information and capabling of writing data at high speeds. The apparatus includes a laser diode having an active layer at its intermediate position and having one area side held over a surface of a semiconductor substrate with an insulating layer interposed between the semiconductor substrate and the laser diode relative to the active layer. The laser diode has two areas with the active layer as a boundary and a constant potential is applied from a power supply to the insulating layer side of the laser diode and a transistor (laser diode drive unit) is provided to apply a modulation signal to the other area of the laser diode so that the laser diode is driven to modulate its output. By doing so, a constant potential is maintained at the semiconductor substrate and at the insulating layer's side of the laser diode and the modulation signal is applied to the other area side of the laser diode. When a drive current of the laser diode is varied by the modulation signal, a voltage variation occurs only on the other area side of the laser diode so that a high-frequency drive current, if flowing through the insulating layer side, is small and hence the laser diode has its output to be modulated effectively.

REFERENCES:
patent: 4716559 (1987-12-01), Hine
patent: 4783776 (1988-11-01), Ishigaki et al.
patent: 4811329 (1989-03-01), Shikama et al.
patent: 4861128 (1989-08-01), Ishikawa et al.
patent: 4893296 (1990-01-01), Matsumoto et al.
patent: 5327415 (1994-07-01), Vettiger et al.
patent: 5446719 (1995-08-01), Yoshida et al.

Affiliated with

Also associated with

Rating

Apparatus using an optical pickup does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus using an optical pickup, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus using an optical pickup will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1252629