EP0218214A2
Expired / Lapsed
EP
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Disk apparatus
Assignee: Toshiba Corp
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Filing: 1986-10-03
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Granted: —
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Expires: 2006-10-03
Abstract
Abstract When an optical disk (l2) is set in an disk apparatus (l0), the apparatus reads out identifination data recorded at a predetermined timing in a predetermined position of the optical disk (l2). The type of the optical disk (l2) is judged according to the identification data. That is, a judgement is made as to whether the optical disk (l2) is of a CAV type, in which the recording/reproduction timing, i.e., the demodulation/modulation frequency is constant irrespective of the access position on the disk, or whether it is of a M-CAV type, in which the recording/ reproduction timing, i.e., the demodulation/modulation frequency, is varied according to the access position. According to the result of judgement, the recording/ reproduction timing, with respect to the optical disk (l2), is controlled for recording or reproduction of data. The optical disk apparatus (l0) can be used both types of optical disk.
Inventors
- 👤 Atsushi C/O Patent Division K.K. Toshiba Ishihara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 11:36
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B19/00; G11B19/20; G11B19/28; G11B20/00; G11B20/10; G11B20/12; G11B20/1217; G11B20/1258; G11B7/004; G11B7/005; G11B7/007; G11B7/00745
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
260 words
A disk apparatus for reproducing data from both first type disk and second type disk, comprising: means for selectively loading one of first and second type disks, said first type disk being of a type for recording data at a constant frequency irrespective of an access position, said second type disk being of a type for recording data at a frequency modified in accordance with an access position, identification data for identifying the system of the disk being initially recorded at a common frequency as a predetermined frequency and at a predetermined position (C) of a common recording density with respect to the first and second type disks; first reproducing means for reproducing said identification data recorded at said predetermined position (C) from the loaded disk at said predetermined frequency; judging means (34) for receiving said identification data reproduced by said first reproducing means and for judging said identification data to see whether the loaded disk belongs to the first or the second disk type; and second reproducing means receptive to judgement result data from said judgement means (34), and external access position information for reproducing, when said judgement result data identifies the first type of disk, data recorded at the disk position designated by said access position information at said constant frequency irrespective of the access position and for reproducing, when said judgement result data identifies the second type of disk, data recorded on the disk position designated by said access position information at a frequency modified in accordance with the access position of said second type of disk.
Claim 2
Dependent Claim
260 words
A disk apparatus for reproducing data from both first type disk and second type disk, comprising: means for selectively loading one of first and second type disks, said first type disk being of a type for recording data at a constant frequency irrespective of an access position, said second type disk being of a type for recording data at a frequency modified in accordance with an access position, identification data for identifying the system of the disk being initially recorded at a common frequency as a predetermined frequency and at a predetermined position (C) of a common recording density with respect to the first and second type disks; first reproducing means for reproducing said identification data recorded at said predetermined position (C) from the loaded disk at said predetermined frequency; judging means (34) for receiving said identification data reproduced by said first reproducing means and for judging said identification data to see whether the loaded disk belongs to the first or the second disk type; and second reproducing means receptive to judgement result data from said judgement means (34), and external access position information for reproducing, when said judgement result data identifies the first type of disk, data recorded at the disk position designated by said access position information at said constant frequency irrespective of the access position and for reproducing, when said judgement result data identifies the second type of disk, data recorded on the disk position designated by said access position information at a frequency modified in accordance with the access position of said second type of disk.
Claim 3
Dependent Claim
30 words
The disk apparatus according to claim l, characterized in that said modified frequency is gradually increased stepwise, from the inside of said second type of disk to the outside thereof.
Claim 4
Dependent Claim
42 words
The disk apparatus according to claim 2, characterized in that from the inside toward the outside of the second type disk said modified frequency is gradually and stepwise increased with said predetermined frequency as a reference in accordance with said access position.
Claim 5
Dependent Claim
146 words
The disk apparatus according to claim 3, characterized in that said second reproducing means comprises a head (22) for reading out data recorded on the loaded disk, a demodulator (56) for demodulating the data read from said head (22), modifying means for modifying a demodulating frequency of said demodulator (56) and l5control means (34) for controlling said modifying means, characterized in that, when the judgement result data supplied from said judging means (34) identifies the first type of disk, said control means (34) controls said modifying means, to cause the demodulating frequency of said demodulator (56) to be modified to said constant frequency, and when said judgement result data identifies the second type of disk, said control means (34) controls said modifying means, to cause the demodulating frequency of said demodulator (56) to be equal to the frequency modified in accordance with said designated access position.
Claim 6
Dependent Claim
73 words
The disk apparatus according to claim 4, characterized in that said control means (34) supplies demodulation frequency data to said modifying means in accordance with the judgement result data from said judging means (34), said modifying means generates a demodulation timing signal of said predetermined or modified frequency on the basis of the demodulation frequency data, and said demodulator (56) demodulates data supplied from said head (22) by the demodulated timing pulse signal.
Claim 7
Dependent Claim
114 words
The disk apparatus according to claim 5, characterized in that said modifying means comprises a variable clock generator (52) including a PLL circuit (84) comprising a loop of a phase comparator (86), a phase/voltage converter (88), a voltage-controlled ocillator (90) and frequency a divider (92), and a reference clock generator (50) for supplying a reference clock to another of said phase comparator (86), characterized in that a frequency of said demodulation timing pulse signal, which is an output of the voltage-controlled ocillator (88) in the PLL circuit (64), is controlled by controlling the output frequency of said frequency divider (92), on the basis of the demodulation frequency data supplied from said control means (34).
Claim 8
Dependent Claim
83 words
The disk apparatus according to claim 5, characterized in that said control means (34) includes memory means (80) for storing a plurality of demodulation frequency data corresponding to an equal number of access positions for the second type of disk, characterized in that, when judgement result data from said judging means (34) identifies said second type of disk, demodulation frequency data corresponding to the external access position information is read out of said memory means (80) and is supplied to said modifying means.
Claim 9
Dependent Claim
50 words
The disk apparatus according to claim 7, characterized in that said disks have a predetermined number of continuous blocks, said memory means (80) stores demodulation frequency data with respect to a plurality of block groups, including a predetermined number of blocks, and said access position corresponds to said block groups.
Claim 10
Dependent Claim
17 words
The disk apparatus according to claim 8, characterized in that said predetermined frequency is said constant frequency.
Claim 11
Dependent Claim
261 words
l0. A disk apparatus for recording data to both first type disk and second type disk, comprising: means for selectively loading one of first and second type disks, said first type disk being of a type for recording data at a constant frequency irrespective of an access position, said second type disk being of a type for recording data at a frequency modified in accordance with an access position, identification data for identifying the system of the disk being initially recorded at a common frequency as a predetermined frequency and at a predetermined position (C) of a common recording density with respect to the first and second type disks; first reproducing means for reproducing said identification data recorded at said predetermined position (C) from the loaded disk at said predetermined frequency; judging means (34) for receiving said identification data reproduced by said first reproducing means and for judging said identification data to see whether the loaded disk belongs to the first or the second disk type; and recording means receptive to judgement result data from said judgement means (34), and external access position information and recording data for recording, when said judgement result data identifies the first type of disk, data to the disk position designated by said access position information at said constant frequency irrespective of the access position and for recording, when said judgement result data identifies the second type of disk, data to the disk position designated by said access position information at a frequency modified in accordance with the access position of said second type of disk.
Claim 12
Dependent Claim
261 words
l0. A disk apparatus for recording data to both first type disk and second type disk, comprising: means for selectively loading one of first and second type disks, said first type disk being of a type for recording data at a constant frequency irrespective of an access position, said second type disk being of a type for recording data at a frequency modified in accordance with an access position, identification data for identifying the system of the disk being initially recorded at a common frequency as a predetermined frequency and at a predetermined position (C) of a common recording density with respect to the first and second type disks; first reproducing means for reproducing said identification data recorded at said predetermined position (C) from the loaded disk at said predetermined frequency; judging means (34) for receiving said identification data reproduced by said first reproducing means and for judging said identification data to see whether the loaded disk belongs to the first or the second disk type; and recording means receptive to judgement result data from said judgement means (34), and external access position information and recording data for recording, when said judgement result data identifies the first type of disk, data to the disk position designated by said access position information at said constant frequency irrespective of the access position and for recording, when said judgement result data identifies the second type of disk, data to the disk position designated by said access position information at a frequency modified in accordance with the access position of said second type of disk.
Claim 13
Dependent Claim
30 words
The disk apparatus according to claim l0, characterized in that said modified frequency is gradually increased stepwise, from the inside of said second type of disk to the outside thereof.
Claim 14
Dependent Claim
42 words
The disk apparatus according to claim ll, characterized in that from the inside toward the outside of the second type disk said modified frequency is gradually and stepwise increased with said predetermined frequency as a reference in accordance with said access position.
Claim 15
Dependent Claim
143 words
The disk apparatus according to claim l2, characterized in that said recording means comprises a head (22) for recording data to the loaded disk, a modulator (70) for modulating the data supplied to said head (22), modifying means for modifying a modulating frequency of said modulator (70) and control means (34) for controlling said modifying means, characterized in that, when the judgement result data supplied from said judging means (34) identifies the first type of disk, said control means (34) controls said modifying means, to cause the modulating frequency of said modulator (70) to be modified to said constant frequency, and when said judgement result data identifies the second type of disk, said control means (34) controls said modifying means, to cause the modulating frequency of said modulator (70) to be equal to the frequency modified in accordance with said designated access position.
Claim 16
Dependent Claim
73 words
The disk apparatus according to claim l3, characterized in that said control means (34) supplies modulation frequency data to said modifying means in accordance with the judgement result data from said judging means (34), said modifying means generates a modulation timing signal of said predetermined or modified frequency on the basis of the modulation frequency data, and said modulator (70) modulates data supplied from said head (22) by the modulated timing pulse signal.
Claim 17
Dependent Claim
114 words
The disk apparatus according to claim l4, characterized in that said modifying means comprises a variable clock generator (52) including a PLL circuit (84) comprising a loop of a phase comparator (86), a phase/voltage converter (88), a voltage-controlled ocillator (90) and a frequency divider (92), and a reference clock generator (50) for supplying a reference clock to another of said phase comparator (86), characterized in that a frequency of said modulation timing pulse signal, which is an output of the voltage-controlled ocillator (88) in the PLL circuit (64), is controlled by controlling the output frequency of said frequency divider (92), on the basis of the modulation frequency data supplied from said control means (34).
Claim 18
Dependent Claim
83 words
The disk apparatus according to claim l4, characterized in that said control means (34) includes memory means (80) for storing a plurality of modulation frequency data corresponding to an equal number of access positions for the second type of disk, characterized in that, when judgement result data from said judging means (34) identifies said second type of disk, modulation frequency data corresponding to the external access position information is read out of said memory means (80) and is supplied to said modifying means.
Claim 19
Dependent Claim
50 words
The disk apparatus according to claim l6, characterized in that said disks have a predetermined number of continuous blocks, said memory means (80) stores modulation frequency data with respect to a plurality of block groups, including a predetermined number of blocks, and said access position corresponds to said block groups.
Claim 20
Dependent Claim
17 words
The disk apparatus according to claim l7, characterized in that said predetermined frequency is said constant frequency.
Claim 21
Independent Claim
231 words
A method for reproducing data from both first type disk and second type disk, comprising: selectively loading one of first and second type disks, said first type disk being of a type for recording data at a constant frequency irrespective of an access position, said second type disk being of a type for recording data at a frequency modified in accordance with an access position, identification data for identifying the system of the disk being initially recorded at a common frequency as a predetermined frequency and at a predetermined position (C) of a common recording density with respect to the first and second type disks; reproducing said identification data recorded at said predetermined position (C) from the loaded disk at said predetermined frequency; receiving said identification data and judging said identification data to see whether the loaded disk belongs to the first or the second disk type; and receiving judgement result data and external access position information, reproducing, when said judgement result data identifies the first type of disk, data recorded at the disk position designated by said access position information at said constant frequency irrespective of the access position and reproducing, when said judgement result data identifies the second type of disk, data recorded on the disk position designated by said access position information at a frequency modified in accordance with the access position of said second type of disk.
Claim 22
Independent Claim
231 words
A method for reproducing data from both first type disk and second type disk, comprising: selectively loading one of first and second type disks, said first type disk being of a type for recording data at a constant frequency irrespective of an access position, said second type disk being of a type for recording data at a frequency modified in accordance with an access position, identification data for identifying the system of the disk being initially recorded at a common frequency as a predetermined frequency and at a predetermined position (C) of a common recording density with respect to the first and second type disks; reproducing said identification data recorded at said predetermined position (C) from the loaded disk at said predetermined frequency; receiving said identification data and judging said identification data to see whether the loaded disk belongs to the first or the second disk type; and receiving judgement result data and external access position information, reproducing, when said judgement result data identifies the first type of disk, data recorded at the disk position designated by said access position information at said constant frequency irrespective of the access position and reproducing, when said judgement result data identifies the second type of disk, data recorded on the disk position designated by said access position information at a frequency modified in accordance with the access position of said second type of disk.
Claim 23
Independent Claim
29 words
The method according to claim l9, characterized in that said modified frequency is gradually increased stepwise, from the inside of said second type of disk to the outside thereof.
Claim 24
Dependent Claim
42 words
2l. The method according to claim 20, characterized in that from the inside toward the outside of the second type disk said modified frequency is gradually and stepwise increased with said predetermined frequency as a reference in accordance with said access position.
Claim 25
Independent Claim
141 words
The method according to claim 2l, characterized in that said data reproduction is performed by reproducing means comprising a head (22) for reading out data recorded on the loaded disk, a demodulator (56) for demodulating the data read from said head (22), modifying means for modifying a demodulating frequency of said demodulator (56) and control means (34) for controlling said modifying means, characterized in that, when the loaded disk identifies the first type of disk, said control means (34) controls said modifying means, to cause the demodulating frequency of said demodulator (56) to be modified to said constant frequency, and when the loaded disk identifies the second type of disk, said control means (34) controls said modifying means, to cause the demodulating frequency of said demodulator (56) to be equal to the frequency modified in accordance with said designated access position.
Claim 26
Dependent Claim
80 words
The method according to claim 22, characterized in that said control means (34) supplies demodulation frequency data corresponding to the type of the loaded disk to said modifying means in accordance with the judgement result data from said judging means (34), said modifying means generates a demodulation timing signal of said predetermined or modified frequency on the basis of the demodulation frequency data, and said demodulator (56) demodulates data supplied from said head (22) by the demodulated timing pulse signal.
Claim 27
Dependent Claim
113 words
The method according to claim 23, characterized in that said modifying means comprises a variable clock generator (52) including a PLL circuit (84) comprising a loop of a phase comparator (86), a phase/voltage converter (88), a voltage-controlled ocillator (90) and a frequency divider (92), and a reference clock generator (50) for supplying a reference clock to another of said phase comparator (86), characterized in that a frequency of said demodulation timing pulse signal, which is an output of the voltage-controlled ocillator (88) in the PLL circuit (64), is controlled by controlling the output frequency of said frequency divider (92), on the basis of the demodulation frequency data supplied from said control means (34).
Claim 28
Dependent Claim
78 words
The disk apparatus according to claim 23, characterized in that said control means (34) includes memory means (80) for storing a plurality of demodulation frequency data corresponding to an equal number of access positions for the second type of disk, characterized in that, when the loaded disk identifies said second type of disk, demodulation frequency data corresponding to the external access position information is read out of said memory means (80) and is supplied to said modifying means.
Claim 29
Dependent Claim
49 words
The method according to claim 25, characterized in that said disks have a predetermined number of continuous blocks, said memory means (80) stores demodulation frequency data with respect to a plurality of block groups, including a predetermined number of blocks, and said access position corresponds to said block groups.
Claim 30
Dependent Claim
16 words
The method according to claim 26, characterized in that said predetermined frequency is said constant frequency.
Claim 31
Independent Claim
234 words
A method for recording data to both first type disk and second type disk, comprising: means for selectively loading one of first and second type disks, said first type disk being of a type for recording data at a constant frequency irrespective of an access position, said second type disk being of a type for recording data at a frequency modified in accordance with an access position, identification data for identifying the system of the disk being initially recorded at a common frequency as a predetermined frequency and at a predetermined position (C) of a common recording density with respect to the first and second type disks; reproducing said identification data recorded at said predetermined position (C) from the loaded disk at said predetermined frequency; receiving said identification data and judging said identification data to see whether the loaded disk belongs to the first or the second disk type; and receiving judgement result data and external access position information and recording data, recording, when said judgement result data identifies the first type of disk, data to the disk position designated by said access position information at said constant frequency irrespective of the access position and recording, when said judgement result data identifies the second type of disk, data to the disk position designated by said access position information at a frequency modified in accordance with the access position of said second type of disk.
Claim 32
Independent Claim
234 words
A method for recording data to both first type disk and second type disk, comprising: means for selectively loading one of first and second type disks, said first type disk being of a type for recording data at a constant frequency irrespective of an access position, said second type disk being of a type for recording data at a frequency modified in accordance with an access position, identification data for identifying the system of the disk being initially recorded at a common frequency as a predetermined frequency and at a predetermined position (C) of a common recording density with respect to the first and second type disks; reproducing said identification data recorded at said predetermined position (C) from the loaded disk at said predetermined frequency; receiving said identification data and judging said identification data to see whether the loaded disk belongs to the first or the second disk type; and receiving judgement result data and external access position information and recording data, recording, when said judgement result data identifies the first type of disk, data to the disk position designated by said access position information at said constant frequency irrespective of the access position and recording, when said judgement result data identifies the second type of disk, data to the disk position designated by said access position information at a frequency modified in accordance with the access position of said second type of disk.
Claim 33
Dependent Claim
29 words
The method according to claim 28, characterized in that said modified frequency is gradually increased stepwise, from the inside of said second type of disk to the outside thereof.
Claim 34
Dependent Claim
41 words
The method according to claim 29, characterized in that from the inside toward the outside of the second type disk said modified frequency is gradually and stepwise increased with said predetermined frequency as a reference in accordance with said access position.
Claim 35
Dependent Claim
141 words
3l. The method according to claim 30, characterized in that said data recording is performed by a recording means comprising a head (22) for recording data to the loaded disk, a modulator (70) for modulating the data supplied to said head (22), modifying means for modifying a modulating frequency of said modulator (70) and control means (34) for controlling said modifying means, characterized in that, when the loaded disk identifies the first type of disk, said control means (34) controls said modifying means, to cause the modulating frequency of said modulator (70) to be modified to said constant frequency, and when the loaded disk identifies the second type of disk, said control means (34) controls said modifying means, to cause the modulating frequency of said modulator (70) to be equal to the frequency modified in accordance with said designated access position.
Claim 36
Independent Claim
80 words
The method according to claim 3l, characterized in that said control means (34) supplies modulation frequency data corresponding to the type of the loaded disk to said modifying means in accordance with the judgement result data from said judging means (34), said modifying means generates a modulation timing signal of said predetermined or modified frequency on the basis of the modulation frequency data, and said modulator (70) modulates data supplied to said head (22) by the modulated timing pulse signal.
Claim 37
Dependent Claim
113 words
The method according to claim 32, characterized in that said modifying means comprises a variable clock generator (52) including a PLL circuit (84) comprising a loop of a phase comparator (86), a phase/voltage converter (88), a voltage-controlled ocillator (90) and a frequency divider (92), and a reference clock generator (50) for supplying a reference clock to another of said phase comparator (86), characterized in that a frequency of said demodulation timing pulse signal, which is an output of the voltage-controlled ocillator (88) in the PLL circuit (64), is controlled by controlling the output frequency of said frequency divider (92), on the basis of the modulation frequency data supplied from said control means (34).
Claim 38
Dependent Claim
78 words
The disk apparatus according to claim 32, characterized in that said control means (34) includes memory means (80) for storing a plurality of modulation frequency data corresponding to an equal number of access positions for the second type of disk, characterized in that, when the loaded disk identifies said second type of disk, modulation frequency data corresponding to the external access position information is read out of said memory means (80) and is supplied to said modifying means.
Claim 39
Dependent Claim
49 words
The method according to claim 34, characterized in that said disks have a predetermined number of continuous blocks, said memory means (80) stores modulation frequency data with respect to a plurality of block groups, including a predetermined number of blocks, and said access position corresponds to said block groups.
Claim 40
Dependent Claim
16 words
The method according to claim 35, characterized in that said predetermined frequency is said constant frequency.
References Cited (Backward Citations)
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