Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1989-12-20
1992-04-14
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369116, 369111, G11B 7125
Patent
active
051054132
ABSTRACT:
In an optical recording device, a record carrier (4) is scanned with an intensity-modulated write beam (13) to form an information pattern of optically detectable marks (8) on the record carrier (4). By means of a verification beam (13), which trails the write beam (14) at a fixed distance, the recorded information is read immediately after recording. The write beam (13) and the verification beam (14) are produced by the same radiation source (10) whose intensity is modulated in conformity with the information to be recorded. In order to eliminate the effect of this modulation in the read signal (Vl) obtained by means of the verification beam (14) a dividing circuit (51) divides the read signal (VI) by a signal (Vn) which is indicative of the instantaneous intensity of the radiation generated by the radiation source (10).
REFERENCES:
patent: 4363116 (1982-12-01), Kleuter et al.
patent: 4488277 (1984-12-01), McFarlane et al.
patent: 4631713 (1986-12-01), Romeas et al.
patent: 4935913 (1990-06-01), Shinoda
patent: 4949331 (1990-08-01), Maeda et al.
Eason Leroy
Envall Jr. Roy N.
Tran Thang V.
U.S. Philips Corporation
LandOfFree
Read-after-write optical recording device having a single radiat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Read-after-write optical recording device having a single radiat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Read-after-write optical recording device having a single radiat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2355142