Pre-pit detecting device and information recording apparatus emp

Details Pre-pit detecting device and information recording apparatus emp Pre-pit detecting device and information recording apparatus emp

1998-04-06

1999-07-27

Cabeca, John W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4426, 369 4437, 3692754, G11B 1103, G11B 1112, G06F 722

Patent

active

059302224

ABSTRACT:
The irradiation device irradiates, at the time of recording main information, a first light beam having a first power and a second light beam having a second power on the pre-pits in a time-divisional manner. The light receiving device receives a reflected light of the first light beam from the pre-pits to produce a first light-receipt signal, and receives a reflected light of the second light beam from the pre-pits to produce a second light-receipt signal. The first detector detects the pre-pits based on the first light-receipt signal to produce a first detection signal, and the second detector detects the pre-pits based on the second light-receipt signal to produce a second detection signal. Then, the processor produces a logical sum of the first detection signal and the second detection signal to output a pre-pit detection signal. Therefore, the pre-pits can be correctly detected in both cases where the first light beam and the second light beam is irradiated, and all pre-pits on the storage medium may be detected to obtain the recording information.

REFERENCES:
patent: 5040165 (1991-08-01), Taii et al.
patent: 5604726 (1997-02-01), Karube
patent: 5774437 (1998-06-01), Yoshida
patent: 5822286 (1998-10-01), Nakayama et al.
patent: 5844882 (1998-12-01), Yoshida et al.
patent: 5844883 (1998-12-01), Kanno et al.
patent: 5850378 (1998-12-01), Ninamino et al.

Affiliated with

Also associated with

Rating

Pre-pit detecting device and information recording apparatus emp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pre-pit detecting device and information recording apparatus emp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pre-pit detecting device and information recording apparatus emp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-887326