Patent US5161067A successfully refreshed from Google Patents.
Patent US2048559A successfully refreshed from Google Patents.
Patent EP0414557A2 successfully refreshed from Google Patents.
EP0414557A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical disk recording/reproducing device
Assignee: Sharp Corp
•
Filing: 1990-08-23
•
Granted: —
•
Expires: 2010-08-23
Abstract
Abstract An optical disk recording/reproducing device for recording and/or reproducing information on and/or from an optical disk while rotatively driving the optical disk in angular constant velocity on which disk pre-recorded information is cyclically formed along a track so as to provide rotation control by constant linear velocity. The device, which includes a clock generating circuit for generating a clock for recording and/or reproducing in accordance with a recording frequency of the pre-recorded information derived from signals reproduced by an optical head, is designed to perform recording and/or reproducing operations with a frequency for recording according to the clock. The device further includes a magnetic field control circuit and/or recording light power control circuit whereby a magnetic field and/or light power to be applied to the optical disk may be varied according to the frequency for recording in recording operation.
Inventors
- 👤 Shigemi Maeda
- 👤 Toshihisa Daiya-Haitsu Deguchi
- 👤 Shigeo Terashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:56
CPC Classifications
G; G11; G11B; G11B7/00; G11B19/00; G11B19/02; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/10504; G11B11/10595; G11B19/20; G11B19/24; G11B19/28; G11B7/002; G11B7/0037; G11B7/004; G11B7/0045
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
116 words
An optical disk recording/reproducing device, which records and/or reproduces information on and/or from an optical disk wherein pre-recorded information is cyclically provided along tracks so as to permit rotation control by constant linear velocity for the entire region thereof, comprising: driving means for rotatively driving the optical disk in constant angular velocity; reproducing means for reproducing information signals provided on the optical disk; reference signal generation means for generating reference signals according to a recording frequency of the pre-recorded information in the information signals reproduced by the reproducing means; and recording means for performing a recording operation by using a frequency for recording in accordance with the reference signal generated by the reference signal generation means.
Claim 2
Dependent Claim
116 words
An optical disk recording/reproducing device, which records and/or reproduces information on and/or from an optical disk wherein pre-recorded information is cyclically provided along tracks so as to permit rotation control by constant linear velocity for the entire region thereof, comprising: driving means for rotatively driving the optical disk in constant angular velocity; reproducing means for reproducing information signals provided on the optical disk; reference signal generation means for generating reference signals according to a recording frequency of the pre-recorded information in the information signals reproduced by the reproducing means; and recording means for performing a recording operation by using a frequency for recording in accordance with the reference signal generated by the reference signal generation means.
Claim 3
Dependent Claim
59 words
An optical disk recording/reproducing device as set forth in claim 1, wherein the pre-recorded information includes absolute addresses, each indicating a recording start position ot each piece of information recorded on the optical disk, and is recorded by giving transverse excursion to guiding grooves forming tracks on the optical disk according to bi-phase-mark modulated waves of the absolute addresses.
Claim 4
Dependent Claim
56 words
An optical disk recording/reproducing device as set forth in claim 1, wherein the pre-recorded information includes absolute addresses, each indicating a recording start position of each piece of information recorded on the optical disk, and is recorded by wobbling guiding grooves forming tracks on the optical disk according to bi-phase-mark modulated waves of the absolute addresses.
Claim 5
Dependent Claim
128 words
An optical disk recording/reproducing device, which records and/or reproduces information on and/or from an optical disk wherein pre-recorded information is cyclically provided along a track so as to permit rotation control by constant linear velocity for the entire region thereof, comprising: driving means for rotatively driving the optical disk in constant angular velocity; reproducing means for reproducing information signals on the optical disk; reference signal generation means for generating a reference signal for reproduction according to a recording frequency of the pre-recorded information in the information signals reproduced by the reproducing means; and a reproduced signal processing circuit for extracting a reproduced signal from the reproduced information signals in a cycle according to a position on the optical disk in a radius direction, according to the reference signal.
Claim 6
Dependent Claim
128 words
An optical disk recording/reproducing device, which records and/or reproduces information on and/or from an optical disk wherein pre-recorded information is cyclically provided along a track so as to permit rotation control by constant linear velocity for the entire region thereof, comprising: driving means for rotatively driving the optical disk in constant angular velocity; reproducing means for reproducing information signals on the optical disk; reference signal generation means for generating a reference signal for reproduction according to a recording frequency of the pre-recorded information in the information signals reproduced by the reproducing means; and a reproduced signal processing circuit for extracting a reproduced signal from the reproduced information signals in a cycle according to a position on the optical disk in a radius direction, according to the reference signal.
Claim 7
Dependent Claim
19 words
An optical disk recording/reproducing device as set forth in claim 4, wherein the driving means is a spindle motor.
Claim 8
Dependent Claim
44 words
An optical disk recording/reproducing device as set forth in claim 4, wherein the reproducing means is an optical head for reproducing signals on the optical disk by applying a laser beam onto the optical disk and by the use of a reflected beam therefrom.
Claim 9
Dependent Claim
40 words
An optical disk recording/reproducing device as set forth in claim 4, wherein the reference signal is a reproduction clock to be entered to the reproduced signal processing circuit, and the reference signal generation means is a reproduction clock generating circuit.
Claim 10
Dependent Claim
117 words
An optical disk recording/reproducing device as set forth in claim 7, wherein the reproduction clock generating circuit comprises: an F/V (frequency/voltage) converter for releasing a voltage according to a frequency of the pre-recorded information entered thereto; a frequency divider; a phase comparison circuit to which the reproduced signal and a signal from the frequency divider are entered; a low-pass filter to which a signal from the phase comparison circuit is entered; an adder for adding the voltage released from the F/V converter and a voltage released from the low-pass filter; and a voltage control oscillator for generating the reproduction clock according to the voltage released from the adder and for releasing a signal to the frequency divider.
Claim 11
Dependent Claim
164 words
An optical disk recording/reproducing device as set forth in claim 7, wherein the reproduction clock generating circuit comprises: a third frequency divider; a switching device for switching between a recording frequency of the reproduced signal and a frequency of an output signal from the third frequency divider; a first phase locked loop composed of a phase comparison circuit, a low-pass filter, a voltage control oscillator and a frequency divider, and having a signal from the switching device entered thereto, which releases the reproduction clock to the reproduced signal processing circuit; and a second phase locked loop composed of a phase comparison circuit, a low-pass filter, a voltage control oscillator and a frequency divider, and having bi-phase-mark modulated waves entered thereto, which releases a signal to the third frequency divider; a dividing ratio of the third frequency divider being predeterminately set so that a frequency of an output of the third frequency divider may be substantially equal to the recording frequency of the reproduced signal.
Claim 12
Dependent Claim
136 words
An optical disk recording/reproducing device, which records and/or reproduces information on and/or from an optical disk wherein pre-recorded information is cyclically provided along a track so as to permit rotation control by constant linear velocity for the entire region thereof, comprising: a spindle motor for rotatively driving the optical disk in constant angular velocity; an optical head for reproducing information signals on the optical disk; a pre-recorded information detection circuit for extracting only the pre-recorded information from the information signals reproduced by the optical head; a reproduction clock generating circuit to which the extracted pre-recorded information and a reproduced signal from the optical head are entered; and a reproduced signal processing circuit for extracting the reproduced signal from the optical head in a cycle according to a reproduction clock released from the reproduction clock generating circuit.
Claim 13
Dependent Claim
136 words
An optical disk recording/reproducing device, which records and/or reproduces information on and/or from an optical disk wherein pre-recorded information is cyclically provided along a track so as to permit rotation control by constant linear velocity for the entire region thereof, comprising: a spindle motor for rotatively driving the optical disk in constant angular velocity; an optical head for reproducing information signals on the optical disk; a pre-recorded information detection circuit for extracting only the pre-recorded information from the information signals reproduced by the optical head; a reproduction clock generating circuit to which the extracted pre-recorded information and a reproduced signal from the optical head are entered; and a reproduced signal processing circuit for extracting the reproduced signal from the optical head in a cycle according to a reproduction clock released from the reproduction clock generating circuit.
Claim 14
Dependent Claim
128 words
An optical disk recording/reproducing device, which records and/or reproduces information on and/or from an optical disk wherein pre-recorded information is cyclically provided along a track so as to permit rotation control by constant linear velocity for the entire region thereof, comprising: driving means for rotatively driving the optical disk in constant angular velocity; pre-recorded information reproducing means for reproducing pre-recorded information in a recording operation; a first reference signal generation means for generating a first reference signal for setting a frequency for recording according to a recording frequency of the pre-recorded information reproduced by the pre-recorded information reproducing means; and recording means for performing a recording operation by using the frequency for recording in accordance with the first reference signal generated by the first reference signal generation means.
Claim 15
Dependent Claim
128 words
An optical disk recording/reproducing device, which records and/or reproduces information on and/or from an optical disk wherein pre-recorded information is cyclically provided along a track so as to permit rotation control by constant linear velocity for the entire region thereof, comprising: driving means for rotatively driving the optical disk in constant angular velocity; pre-recorded information reproducing means for reproducing pre-recorded information in a recording operation; a first reference signal generation means for generating a first reference signal for setting a frequency for recording according to a recording frequency of the pre-recorded information reproduced by the pre-recorded information reproducing means; and recording means for performing a recording operation by using the frequency for recording in accordance with the first reference signal generated by the first reference signal generation means.
Claim 16
Dependent Claim
86 words
An optical disk recording/reproducing device as set forth in claim 11 further comprising: a second reference signal generating circuit for generating a second reference signal for determining recording conditions including at least either light power for recording or intensity of magnetic field for recording, according to the pre-recorded information reproduced by the pre-recorded information reproducing means; and recording condition setting means for determining recording conditions according to the second reference signal from the second reference signal generation means and for releasing them to the recording means.
Claim 17
Dependent Claim
22 words
An optical disk recording/reproducing device as set forth in claim 11 or claim 12, wherein the driving means is a spindle motor.
Claim 18
Dependent Claim
40 words
An optical disk recording/reproducing device as set forth in claim 11 or claim 12, wherein the first reference signal is a recording clock and the first reference signal generation means is a clock generating circuit for generating the recording clock.
Claim 19
Dependent Claim
49 words
An optical disk recording/reproducing device as set forth in claim 11 or claim 12, wherein the pre-recorded information reproducing means is an optical head for reproducing information on the optical disk by applying a laser beam onto the optical disk and by the use of a reflected beam therefrom.
Claim 20
Dependent Claim
44 words
An optical disk recording/reproducing device as set forth in claim 11 or claim 12, wherein the recording means comprises an optical head for applying a laser beam onto the optical disk and a magnetic coil for applying a magnetic field to the optical disk.
Claim 21
Dependent Claim
32 words
An optical disk recording/reproducing device as set forth in claim 12, wherein the second reference signal includes at least either a magnetic field control signal or a recording light power control signal.
Claim 22
Dependent Claim
71 words
An optical disk recording/reproducing device as set forth in claim 17, wherein the second reference signal generation means comprises at least either a magnetic field control circuit for generating the magnetic field control signal or a recording light power control circuit for generating the recording light power control signal, and the recording condition setting means comprises at least either the magnetic field control circuit or the recording light power control circuit.
Claim 23
Dependent Claim
193 words
An optical disk recording/reproducing device, which records and/or reproduces information on and/or from an optical disk wherein pre-recorded information is cyclically provided along a track so as to permit rotation control by constant linear velocity for the entire region thereof, comprising: a spindle motor for rotatively driving the optical disk in constant angular velocity; an optical head for applying a laser beam onto the optical disk in a recording operation and for reproducing the pre-recorded information by the use of a beam reflected from the optical disk; a pre-recorded information detection circuit for extracting the pre-recorded information from information signals reproduced by the optical head; a clock generating circuit for generating a recording clock for determining a frequency for recording according to a recording frequency of the pre-recorded information entered from the pre-recorded information detection circuit; and a magnetic coil for applying a magnetic field to the optical disk and for performing a recording operation of information to be recorded, entered from an external device, with the aid of the laser beam applied from the optical head by the frequency for recording according to the recording clock generated by the clock generating circuit.
Claim 24
Dependent Claim
193 words
An optical disk recording/reproducing device, which records and/or reproduces information on and/or from an optical disk wherein pre-recorded information is cyclically provided along a track so as to permit rotation control by constant linear velocity for the entire region thereof, comprising: a spindle motor for rotatively driving the optical disk in constant angular velocity; an optical head for applying a laser beam onto the optical disk in a recording operation and for reproducing the pre-recorded information by the use of a beam reflected from the optical disk; a pre-recorded information detection circuit for extracting the pre-recorded information from information signals reproduced by the optical head; a clock generating circuit for generating a recording clock for determining a frequency for recording according to a recording frequency of the pre-recorded information entered from the pre-recorded information detection circuit; and a magnetic coil for applying a magnetic field to the optical disk and for performing a recording operation of information to be recorded, entered from an external device, with the aid of the laser beam applied from the optical head by the frequency for recording according to the recording clock generated by the clock generating circuit.
Claim 25
Dependent Claim
37 words
An optical disk recording/reproducing device as set forth in claim 19, wherein the clock generating circuit is a phase locked loop composed of a phase comparator, a low-pass filter, a voltage control oscillator and a frequency divider.
Claim 26
Dependent Claim
65 words
An optical disk recording/reproducing device as set forth in claim 19, wherein the clock generating circuit comprises: an F/V (frequency/voltage) converter for releasing a voltage according to a frequency of the pre-recorded information entered thereto; and a V/F (voltage/frequency) converter for releasing a frequency as the recording clock, which is converted at a predetermined converting rate according to the voltage released from the F/V converter.
Claim 27
Dependent Claim
79 words
An optical disk recording/reproducing device as set forth in claim 19, wherein the clock generating circuit comprises: a frequency measuring section for counting changing points of a synchronous clock of the pre-recorded information per predetermined unit of time; a translation table for releasing a value corresponding to a frequency measured by the frequency measuring section; and a programmable oscillator for oscillating with a frequency according to the value from the translation table so as to release the recording clock.
Claim 28
Dependent Claim
86 words
An optical disk recording/reproducing device as set forth in claim 19, wherein the clock generating circuit comprises: a cycle measuring section for finding an average cycle by counting intervals between changing points of a synchronous clock of the pre-recorded information based on a high-speed clock; a translation table for releasing a value corresponding to a cycle measured by the cycle measuring section; and a programmable oscillator for oscillating with a frequency according to the value from the translation table so as to release the recording clock.
Claim 29
Dependent Claim
56 words
An optical disk recording/reproducing device as set forth in claim 19 further comprising a magnetic field control circuit for generating and releasing a magnetic field control signal which changes intensity of a magnetic field to be applied onto the optical disk in a recording operation, according to the pre-recorded information from the pre-recorded information detection circuit.
Claim 30
Dependent Claim
56 words
An optical disk recording/reproducing device as set forth in claim 24, wherein the magnetic field control circuit comprises an F/V converter for releasing as the magnetic field control signal a voltage having a value to form a most suitable magnetic field at a disk speed in accordance with the frequency of the pre-recorded information entered thereto.
Claim 31
Dependent Claim
77 words
An optical disk recording/reproducing device as set forth in claim 24, wherein the magnetic field control circuit comprises an address decoder for releasing a value obtained by demodulating the pre-recorded information entered thereto, a translation table for releasing a control signal according to the value from the address decoder and a D/A converter for converting the control signal from the translation table from digital to analog format and for releasing it as a magnetic field control signal.
Claim 32
Dependent Claim
56 words
An optical disk recording/reproducing device as set forth in claim 19 further comprising a recording light power control circuit for generating and releasing a light power control signal which changes intensity of light power to be applied onto the optical disk in a recording operation, according to the pre-recorded information from the pre-recorded information detection circuit.
Claim 33
Dependent Claim
42 words
An optical disk recording/reproducing device as set forth in claim 27, wherein the recording light power control circuit comprises an F/V converter for releasing a voltage according to a frequency of the pre-recorded information entered thereto as the light power control signal.
Claim 34
Dependent Claim
78 words
An optical disk recording/reproducing device as set forth in claim 27, wherein the recording light power control circuit comprises an address decoder for releasing a value obtained by demodulating the pre-recorded information entered thereto, a translation table for releasing a control signal according to the value from the address decoder and a D/A converter for converting the control signal from the translation table from digital to analog format and for releasing it as the light power control signal.
Claim 35
Dependent Claim
162 words
A control method in an optical disk recording/reproducing device for accessing to an optical disk having pre-recorded information cyclically provided along a track thereon so as to permit rotation control by constant linear velocity, while providing rotation control in constant angular velocity, comprising the steps of: reproducing information while rotating the optical disk in the constant angular velocity; switching a switching device so as to enter to a first phase comparison circuit an output signal from a third frequency divider where pre-recorded information is entered through a phase locked loop in a reproduction clock generating circuit, after having started an access operation upon receiving an instruction for accessing to a desired piece of pre-recorded information; judging whether the access operation has been completed or not; and switching the switching device so as to enter to the first phase comparison circuit a reproduced signal as an input signal thereto, which is reproduced by the optical head, when the access operation has been completed.
Claim 36
Dependent Claim
162 words
A control method in an optical disk recording/reproducing device for accessing to an optical disk having pre-recorded information cyclically provided along a track thereon so as to permit rotation control by constant linear velocity, while providing rotation control in constant angular velocity, comprising the steps of: reproducing information while rotating the optical disk in the constant angular velocity; switching a switching device so as to enter to a first phase comparison circuit an output signal from a third frequency divider where pre-recorded information is entered through a phase locked loop in a reproduction clock generating circuit, after having started an access operation upon receiving an instruction for accessing to a desired piece of pre-recorded information; judging whether the access operation has been completed or not; and switching the switching device so as to enter to the first phase comparison circuit a reproduced signal as an input signal thereto, which is reproduced by the optical head, when the access operation has been completed.
Claim 37
Independent Claim
85 words
A method in an optical disk recording/reproducing device for recording information in constant angular velocity on an optical disk having pre-recorded information cyclically provided along tracks thereon so as to permit rotation control by constant linear velocity, comprising the steps of: rotating the optical disk in the constant angular velocity; extracting pre-recorded information from information signals obtained by reproducing information on the optical disk, and detecting its recording frequency; generating a recording clock from the recording frequency; and writing information by using the recording clock.
Claim 38
Independent Claim
85 words
A method in an optical disk recording/reproducing device for recording information in constant angular velocity on an optical disk having pre-recorded information cyclically provided along tracks thereon so as to permit rotation control by constant linear velocity, comprising the steps of: rotating the optical disk in the constant angular velocity; extracting pre-recorded information from information signals obtained by reproducing information on the optical disk, and detecting its recording frequency; generating a recording clock from the recording frequency; and writing information by using the recording clock.
Claim 39
Dependent Claim
53 words
A method as set forth in claim 31 further comprising the steps of: generating control signals for determining recording conditions according to the pre-recorded information; controlling intensity of a magnetic field to be applied to the optical disk and/or light power to be applied onto the optical disk by using the control signals.
Claim 40
Dependent Claim
107 words
Apparatus for recording or reproducing information on from an optical disc provided with address information which is prerecorded along a spiral track or concentric tracks of the disc for use in constant linear velocity control of rotation of the disc, characterised in that the apparatus is adapted to rotate the disc at a constant angular velocity and to record or reproduce the information at a rate which is controlled in accordance with a reference signal generated by a reproducing means of the apparatus as it reproduces said prerecorded address information, said rate of recording or reproducing thereby varying in dependence upon the radial position on the disc.
Claim 41
Dependent Claim
107 words
Apparatus for recording or reproducing information on from an optical disc provided with address information which is prerecorded along a spiral track or concentric tracks of the disc for use in constant linear velocity control of rotation of the disc, characterised in that the apparatus is adapted to rotate the disc at a constant angular velocity and to record or reproduce the information at a rate which is controlled in accordance with a reference signal generated by a reproducing means of the apparatus as it reproduces said prerecorded address information, said rate of recording or reproducing thereby varying in dependence upon the radial position on the disc.
Claim 42
Dependent Claim
19 words
Apparatus according to claim 33 wherein said address information comprises address marks provided regularly along the track or tracks.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.