Patent EP0484555A1 successfully refreshed from Google Patents.
EP0484555A1
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EP
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Optical information recording/reproducing device using pit edge recording system
Assignee: Hitachi Ltd
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Filing: 1991-05-24
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Granted: —
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Expires: 2011-05-24
Abstract
Abstract A method of recording information for an information recording/reproducing device which is provided with a disklike recording medium, a means for rotating the recording medium at a constant angular velocity, a means for recording a coded information in a nearly fixed bit-length regarding the position in a radial direction of the recording medium, a means for producing a modulated signal by modulating the coded information to be recorded, and a recording means for forming locally a recording region having physically different properties from those of other regions on the recording medium, and in which the coded information is recorded in correspondence with an edge of the recording region by controlling the recording means with the modulated signal, said information recording/reproducing method characterized in that parts of the recording and reproducing characteristics differ with the position of the recorded information in the recording medium by using a recording/reproducing system in which the bit rate of the coded information to be recorded differs with the position.
Inventors
- 👤 Takeshi 6-21-19 Honcho Maeda
- 👤 Shinichi 1-9-29 Minamikamonomiya Arai
- 👤 Kazuo Sunnytown 406 Isaka
- 👤 Atsushi 2-11-12 Kandori Saito
- 👤 Takuya Mizokami
- 👤 Hisataka 2-750-9 Hanakoganei Sugiyama
- 👤 Satoshi F1202 1-28 Deiki Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:52
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/005; G11B20/00; G11B20/10; G11B20/12; G11B20/1217; G11B20/1258; G11B20/14; G11B20/1403; G11B20/18; G11B20/1833; G11B23/00; G11B23/38; G11B23/40; G11B7/0045; G11B7/12; G11B7/125; G11B7/126; G11B20/1879; G11B2020/1264; G11B2020/1265; G11B2020/1277; G11B7/007; G11B7/00736; G11B7/0079
Claims Analysis
Total Claims: 63
Claim 1
Independent Claim
52 words
An information recording/reproducing apparatus characterized in that there is used a recording/reproducing system in which the bit rate of code information to be recorded changes depending on a location on a recording medium, and a recording characteristic and a reproducing characteristic are changed in accordance with a location on the recording medium.
Claim 2
Dependent Claim
116 words
An information recording/reproducing apparatus according to Claim 1, comprising the recording medium having a disk-like shape, means for rotating the recording medium at an approximately constant velocity and means for recording code information so that the bit length of code information becomes approximately constant with respect to a radial position on the recording medium, in which there are provided means for modulating the code information to be recorded to form a modulated signal and recording means for forming in the recording medium a localized recording region having a different physical property, the recording means being controlled by the modulated signal so that the code information is recorded to correspond to the edge of the recording region.
Claim 3
Dependent Claim
39 words
An information recording/reproducing apparatus according to Claim 2, wherein the recording medium is divided into zones each of which includes a plurality of approximately concentric tracks, and the recording characteristic and the reproducing characteristic are changed at every zone.
Claim 4
Dependent Claim
39 words
An information recording/reproducing apparatus according to Claim 3, wherein the recording medium is divided into groups each of which includes a plurality of approximately concentric zones, and the recording characteristic and the reproducing characteristic are changed at every group.
Claim 5
Dependent Claim
45 words
An information recording/reproducing apparatus according to Claim 4, wherein each of the recording characteristic and the reproducing characteristic changed for each group is set in an overlapping manner to cover not only the corresponding group but also parts of groups adjacent to the corresponding group.
Claim 6
Dependent Claim
76 words
An information recording/reproducing apparatus according to Claim 2, wherein the recording medium is divided into zones each of which includes a plurality of approximately concentric tracks, said zones are grouped into groups each of which includes a plurality of zones, a part of each of the recording characteristic and the reproducing characteristic is changed at every zone, and the other part of each of the recording characteristic and the reproducing characteristic is changed at every group.
Claim 7
Dependent Claim
22 words
An information recording/reproducing apparatus according to Claim 6, wherein a clock frequency for modulation of code information is changed at every zone.
Claim 8
Dependent Claim
65 words
An information recording/reproducing apparatus according to Claim 7, wherein a frequency synthesizer circuit is used as means for generation of the clock frequency and the clock frequency at each zone is changed by changing the frequency division ratio for either one of primary oscillation reference clocks inputted to a phase comparator in the frequency synthesizer circuit and clocks for data modulation or the both thereof.
Claim 9
Dependent Claim
38 words
An information recording/reproducing apparatus according to Claim 6, wherein the width of a recording light pulse is changed at every zone and the intensity of the recording light pulse is changed at every zone or at every group.
Claim 10
Dependent Claim
33 words
An information recording/reproducing apparatus according to Claim 9, wherein the intensity of the recording light pulse is increased with the progression from an inner circumference of the disk to an outer circumference thereof.
Claim 11
Dependent Claim
33 words
An information recording/reproducing apparatus according to Claim 9, wherein the width of the recording light pulse is decreased with the progression from the inner circumference of the disk to the outer circumference thereof.
Claim 12
Dependent Claim
60 words
An information recording/reproducing apparatus according to Claim 9, wherein the width of the recording light pulse is changed in such a manner that a pulse width of an NRZ (non-return to zero) converted version of modulated code information is corrected by a constant time width irrespective of a code pattern and the amount of correction is changed at every zone.
Claim 13
Dependent Claim
71 words
An information recording/reproducing apparatus according to Claim 2, wherein a decision signal for deciding a range where the position of the front/rear edge of a pit exists is produced from a differentiated signal of a detection signal and the position of the pit edge is detected by use of the decision signal and a signal representative of a zero cross point of a signal obtained by further differentiating the differentiated signal.
Claim 14
Dependent Claim
38 words
An information recording/reproducing apparatus according to Claim 13, wherein the electrical characteristic of each of differentiating circuits such as a frequency characteristic or a phase characteristic is changed in accordance with a radial position on the recording medium.
Claim 15
Dependent Claim
50 words
An information recording/reproducing apparatus according to Claim 13, wherein a low-pass filter is provided at a front or rear stage of each of differentiating circuits and the electrical characteristic of the low-pass filter such as a frequency characteristic or a phase characteristic is changed in accordance with a radial position.
Claim 16
Dependent Claim
76 words
An information recording/reproducing apparatus according to Claim 15, wherein the electrical characteristic of one of the first low-pass filter provided at the front or rear stage of the first differentiating circuit and the second low-pass filter provided at the front or rear stage of the second differentiating circuit is fixed irrespective of the radial position on the disk and only the electrical characteristic of the other low-pass filter is changed in accordance with the radial position.
Claim 17
Dependent Claim
18 words
An information recording/reproducing apparatus according to Claim 16, wherein the low-pass filter has a delay amount flatness characteristic.
Claim 18
Dependent Claim
38 words
An information recording/reproducing apparatus according to Claim 6, wherein the self-running oscillation frequency of a PLL (phase locked loop) circuit for generating clocks for data demodulation from a detected signal is changed in accordance with a radial direction.
Claim 19
Dependent Claim
37 words
An information recording/reproducing apparatus according to Claim 18, wherein the range of frequencies of the PPL circuit capable of being pulled-in covers not only the corresponding group but also parts of groups adjacent to the corresponding group.
Claim 20
Dependent Claim
29 words
An information recording/reproducing apparatus according to Claim 18, wherein the electrical characteristic of a loop filter of the PLL circuit is changed at ever zone or at every block.
Claim 21
Dependent Claim
73 words
An information recording/reproducing apparatus according to Claim 6, wherein, in a first mode in which recording data is detected at the rotation immediately after data recording, a first detection window width for data demodulation is corrected so that it becomes narrower than a second detection window width in a second mode of detecting the recording data after the first mode, the amount of correction being changed at every zone or at every block.
Claim 22
Dependent Claim
36 words
An information recording/reproducing apparatus according to Claim 21, wherein the amount of correction for the first detection window width is decreased with the progression from an inner circumference of the disk to an outer circumference thereof.
Claim 23
Dependent Claim
42 words
An information recording/reproducing apparatus according to Claim 21, wherein the amount of correction for the first detection window width is set so that the ratio of the first detection window width to the second detection window width becomes constant in each zone.
Claim 24
Dependent Claim
37 words
An information recording/reproducing apparatus according to Claim 1, wherein the shortest bit interval of the code information after modulation is at least one time as large as the bit interval of the code information to be recorded.
Claim 25
Dependent Claim
49 words
An information recording/reproducing apparatus according to Claim 3, wherein the front edges and the rear edges of the formed recording regions are detected independently from each other to discriminate front and rear edge data, the detected edge data are thereafter synthesized, and the synthesized data are subjected to demodulation.
Claim 26
Dependent Claim
68 words
An information recording/reproducing apparatus according to Claim 25, wherein the front and rear edge data are synthesized by sequencing the edge data for each of the front and rear edges after the discrimination each edge data and arranging the edge data in reference to the arrangement of front edge data and rear edge data of a specified pattern and in accordance with the sequence of each edge data.
Claim 27
Dependent Claim
27 words
An information recording/reproducing apparatus according to Claim 26, wherein a plurality of the specified patterns are recorded with the code information after modulation at a specified interval.
Claim 28
Dependent Claim
165 words
An information recording/reproducing method in an information recording/reproducing apparatus comprising a recording medium having a disk-like shape, means for rotating the recording medium at a constant angular velocity, means for recording code information so that the bit length of the code information becomes approximately constant with respect to a radial position on the recording medium, means for modulating the code information to be recorded to form a modulated signal, and recording means for forming in the recording medium a localized recording region having a different physical property, the recording means being controlled by the modulated signal so that the code information is recorded to correspond to the edge of the recording region, in which there is used a recording/reproducing system in which the bit rate of the code information to be recorded changes depending on a location on the recording medium, and a part of each of a recording characteristic and a reproducing characteristic is changed in accordance with a location on the recording medium.
Claim 29
Dependent Claim
39 words
An information recording/reproducing method according to Claim 28, wherein the recording medium is divided into groups each of which includes a plurality of approximately concentric zones, and the recording characteristic and the reproducing characteristic are changed at every group.
Claim 30
Dependent Claim
18 words
An information recording/reproducing method according to Claim 29, wherein the number of sectors in each zone is constant.
Claim 31
Dependent Claim
32 words
An information recording/reproducing method according to Claim 29, wherein the number of sectors per one track in each zone is increased with the progression from an inner circumference to an outer circumference.
Claim 32
Dependent Claim
28 words
An information recording/reproducing method according to Claim 29, wherein a recording area is constructed by the combination of plural kinds of zones which have different numbers of tracks.
Claim 33
Dependent Claim
74 words
An information recording/reproducing method according to Claim 28, wherein an area on the recording medium is constructed by a user region to be used by a user, a manufacture region for recognization of the characteristic and the kind of the optical disk, and a guard region for absorption of the variations in the mechanical precision of a driving device of the optical disk, these regions being arranged in a radial direction of the disk.
Claim 34
Dependent Claim
56 words
An information recording/reproducing method according to Claim 33, wherein the guard region includes a continuous region composed of a plurality of tracks and is provided on each of the inner circumference side and the outer circumference side of the radius of the disk so that it is interposed between the user region and the manufacture region.
Claim 35
Dependent Claim
55 words
An information/reproducing method according to Claim 34, wherein the guard region on the inner circumference side is provided in a radial range of the disk between 130 mm and 140 mm and the guard region on the outer circumference side is provided in a radial range of the disk between 270 mm and 290 mm.
Claim 36
Dependent Claim
54 words
An information recording/reproducing method according to Claim 33, wherein the user region includes a plurality of zones each of which is composed of a predetermined constant number of tracks, and at least one track at the boundary of the zones is used as a guard track for which recording of data is not mode.
Claim 37
Dependent Claim
45 words
An information recording/reproducing method according to Claim 33, wherein the manufacture region includes one interposed between the guard region on the inner circumference side and the user region and the other interposed between the user region and the guard region on the outer circumference side.
Claim 38
Dependent Claim
62 words
An information recording/reproducing method according to Claim 33, wherein a control track region, which can recognize the kind of the disk and control information even in a state in which only a focus servo is effected and has a clock frequency and a modulation system different from those of usual data, is provided inside the guard region on the inner circumference side.
Claim 39
Dependent Claim
32 words
An information recording/reproducing method according to Claim 38, wherein a marking region having a marking printed in a rugged form upon fabrication of the disk is provided inside the control track region.
Claim 40
Dependent Claim
28 words
An information recording/reproducing method according to Claim 38, wherein the control track region has a length of at least 500 µm in a radial direction of the disk.
Claim 41
Dependent Claim
35 words
An information recording/reproducing method according to Claim 33, wherein information including track numbers and sector numbers are beforehand written in the user region, the manufacture region and the guard region upon fabrication of the disk.
Claim 42
Dependent Claim
61 words
An information recording/reproducing method according to Claim 41, wherein each sector includes a preformatted information in which information of a track number and a sector number is recorded, a data area in which user data is recorded which is used in the disk driving device, and a flag area for deciding the present/absence of the previous recording into the data area.
Claim 43
Dependent Claim
28 words
An information recording/reproducing method according to Claim 42, wherein the preformatted area, the flag area and the data area are provided in each sector in the mentioned order.
Claim 44
Dependent Claim
38 words
An information recording/reproducing method according to Claim 42, wherein in each of the preformatted area and the data area, the front edge of each recording mark is started and the rear edge of each recording mark is terminated.
Claim 45
Dependent Claim
31 words
An information recording/reproducing method according to Claim 42, wherein an ID (identify) field including a track number and a sector number is double written, for each sector, in the preformatted area.
Claim 46
Dependent Claim
78 words
An information recording/reproducing method according to Claim 45, wherein the ID field is constructed with six bytes in total which include two bytes as the track number, one byte as the sector number, one byte as an ID number for indicating whether the corresponding ID field is the first ID or the second ID in the corresponding sector, and two bytes as a CRC (cyclic redundance check) portion for deciding the correction of data in the ID field.
Claim 47
Dependent Claim
32 words
An information recording/reproducing method according to Claim 45, wherein a recognition mark for generation of the timing of start of demodulation is provided immediately before the ID field in the preformatted area.
Claim 48
Dependent Claim
27 words
An information recording/reproducing method according to Claim 47, wherein a pattern different from a pattern included in a used modulation system is used as the recognition mark.
Claim 49
Dependent Claim
19 words
An information recording/reproducing method according to Claim 47, wherein data of one byte is used as the recognition mark.
Claim 50
Dependent Claim
39 words
An information recording/reproducing method according to Claim 47, wherein a VFO field for the pull-in synchronization of reproducing clocks for the demodulation of data is provided immediately before each recognition mark and at the head of the data area.
Claim 51
Dependent Claim
31 words
An information recording/reproducing method according to Claim 50, wherein the VFO field uses as code information after modulation a continuous pattern in which the number of "0's" between "1's" becomes constant.
Claim 52
Dependent Claim
30 words
An information recording/reproducing method according to Claim 50, wherein the VFO field uses as code information after modulation a pattern in which the number of "0's" between "1's" becomes odd.
Claim 53
Dependent Claim
70 words
An information recording/reproducing method according to Claim 50, wherein the number of "1's" in the VFO field immediately preceding the second recognition mark in the preformatted area is changed in accordance with whether the number of "1" until the ID field immediately preceding that VFO field is even or odd, thereby making a pit pattern of the second recognition mark coincident with a pit pattern of the first recognition mark.
Claim 54
Dependent Claim
39 words
An information recording/reproducing method according to Claim 42, wherein a field for the completion of modulation and for terminating the formatted area by the rear edge of a recording mark is provided at the last of the preformatted area.
Claim 55
Dependent Claim
47 words
An information recording/reproducing method wherein as a recording flag recorded in the flag area is used a repeating pattern of a constant period in which the number of "1's" in code information after modulation is even and integer times of a period between "1's" form one byte.
Claim 56
Dependent Claim
33 words
An information recording/reproducing method according to Claim 50, wherein a recognition mark for the start of data demodulation is recorded immediately succeeding the VFO field provided at the head of the data area.
Claim 57
Dependent Claim
19 words
An information recording/reproducing method according to Claim 56, wherein the recognition mark includes data of at least two times.
Claim 58
Dependent Claim
51 words
An information recording/reproducing method according to Claim 56, wherein the recognition mark includes a pattern which can be recognized as a recognition mark from at least one of a data string obtained from the front edges of recording marks and a data string obtained from the rear edges of recording marks.
Claim 59
Dependent Claim
80 words
An information recording/reproducing method according to Claim 56, wherein resynchronization marks distinguishable from user data are inserted at intervals equal to a predetermined number of bytes of a data field to be recorded after the recognition mark, and the resynchronization mark includes a pattern which can be decided as a resynchronization mark from at least one of a data string obtained from the front edges of recording marks and a data string obtained from the rear edges of recording marks.
Claim 60
Dependent Claim
31 words
An information recording/reproducing method according to Claim 59, wherein a pattern different from a pattern included in a used modulation system is used as at least one of the resynchronization marks.
Claim 61
Dependent Claim
33 words
An information recording/reproducing method according to Claim 42, wherein a data construction of the user area uses an LDC (long distance code) construction in which a plurality of numbers of bytes are interleaved.
Claim 62
Dependent Claim
34 words
An information recording/reproducing method according to Claim 42, wherein a redundant bit for terminating the data area by the rear edge of a recording mark is added to the last of the data area.
Claim 63
Dependent Claim
21 words
An information recording/reproducing method according to Claim 1, wherein an RLL (run length limited) code is used as a modulation system.
References Cited (Backward Citations)
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