Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1997-03-12
1998-03-03
Huber, Paul W.
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
3692753, G11B 576, G11B 370
Patent
active
057243301
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an information recording medium in which multi-bit digital information is represented by the shift amount of the a edge of a pit formed in an information recording medium, a recording apparatus, a reproducing apparatus, and a recording and reproducing apparatus for such a recording medium.
BACKGROUND ART
In conventional optical disks, a servo byte is periodically provided at a predetermined position of each track, and a clock pit for generating a reference clock and wobble pits for tracking are formed in each servo byte period. A reference clock is generated in response to the clock pits, and digital recording information is represented by a pit whose length corresponds to integral multiple of the period of the reference clock.
In a compact disc, for example, although there is no clock pit, digital recording information is also recorded by a pit whose length (in the range of 0.9 .mu.m to 3.3 .mu.m) corresponds to an integral multiple of the period of the reference.
As described above, in the conventional optical disk and the compact disc, a pit having a length corresponding to an integral multiple of the period of the reference clock is formed, and the digital recording information is represented by the length of the pit. However, when the digital recording information is represented by the length of the pit, it is difficult to increase the recording density.
When a 0.9 .mu.m-long pit is recorded immediately after a 3.3 .mu.m-long, the so-called heat storage effect results in the 0.9 .mu.m-long pit being formed larger than expected because of heating of the disk when the 3.3 .mu.m-long pit was recorded. As a result, the signal recorded on the disk is distorted and the read-out margin of the digital recording information reproduced from the disk is reduced.
SUMMARY OF THE INVENTION
In view of the above-mentioned situation, the purpose of the present invention is to increase the recording density of digital recording information recorded in a recording medium.
In an information recording apparatus according to the present invention, digital recording information is recorded such that the position of the leading or trailing edge of the information pit is shifted in a step-wise fashion relative to the respective leading or trailing edge of, for example, the reference clock pit or a reference position represented by the leading or trailing edge of a position reference pit or the like in response to digital recording information.
An information recording medium according to the present invention includes an information pit in which the edge position is changed in response to the digital recording information.
In the information recording medium according to the present invention, the phase of the information pit is shifted by 90 degrees between adjacent tracks.
In an information reproducing apparatus according to the present invention, the digital recording information is reproduced by detecting the shift mount of the leading or trailing edge of the information pit relative to the reference position.
The information recording apparatus according to the present invention records a position reference pit which indicates the reference position of the edge of the information pit.
In the information recording medium according to the present invention, the position reference pits indicating the reference position of the edge of the information pit are provided in a predetermined ratio to the information pits.
In the information reproducing apparatus according to the present invention, a correction circuit corrects the detected position of the edge of the information pit according to the detected position of the edge of the position reference pit.
In the information recording medium according to the present invention, wobble pits used for tracking control are located so that one wobble pit is made common to adjacent tracks.
In the information recording and reproducing apparatus according to the present invention, the polarity of the tracking performed in response
REFERENCES:
patent: 4774522 (1988-09-01), Van Tongeren et al.
patent: 4809251 (1989-02-01), Collomby et al.
patent: 4873680 (1989-10-01), Chung et al.
patent: 5034940 (1991-07-01), Saito et al.
patent: 5063546 (1991-11-01), Ito et al.
patent: 5345434 (1994-09-01), Ide et al.
patent: 5404345 (1995-04-01), Taki
patent: 5414689 (1995-05-01), Maeda et al.
patent: 5450381 (1995-09-01), Tsukamura et al.
patent: 5524103 (1996-06-01), Shimizu et al.
patent: 5557592 (1996-09-01), Kobayashi et al.
patent: 5566158 (1996-10-01), Kobayashi et al.
Kashiwagi Toshiyuki
Kobayashi Seiji
Okamura Hiroshige
Yamatsu Hisayuki
Huber Paul W.
Sony Corporation
LandOfFree
Information recording medium wherein multi-bit digital informati does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Information recording medium wherein multi-bit digital informati, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Information recording medium wherein multi-bit digital informati will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2255700