WO2004038705A1 - 光学的情報記録方法、光学的情報記録装置および光学的情報記録媒体 - Google Patents
光学的情報記録方法、光学的情報記録装置および光学的情報記録媒体 Download PDFInfo
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- WO2004038705A1 WO2004038705A1 PCT/JP2003/013745 JP0313745W WO2004038705A1 WO 2004038705 A1 WO2004038705 A1 WO 2004038705A1 JP 0313745 W JP0313745 W JP 0313745W WO 2004038705 A1 WO2004038705 A1 WO 2004038705A1
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- recording
- power level
- linear velocity
- optical information
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1263—Power control during transducing, e.g. by monitoring
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/006—Overwriting
- G11B7/0062—Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1267—Power calibration
Definitions
- Optical information recording method optical information recording device, and optical information recording medium
- the present invention relates to a recording / reproducing method and a recording / reproducing apparatus for an optical information recording medium for optically recording / reproducing data, and in particular, to generating a recording pulse waveform for a medium for recording at a plurality of different linear velocities. It is related to the method.
- optical disks In recent years, optical disks, optical disks, optical tapes, and the like have been proposed and developed as optically recording media. Among them, optical disks are receiving attention as media capable of recording and reproducing data at high capacity and high density.
- data recording and reproduction are performed by the method described below.
- a laser beam focused by an optical head and having a higher intensity than the reproduction power (this power level is called a recording power level and is represented by P w) is applied to the recording film of the optical disk to exceed the melting point of the recording film.
- P w recording power level
- the molten portion As the laser beam passes, the molten portion is cooled rapidly with the passage of the laser beam to form an amorphous mark.
- this power level is called the erasing power level and is expressed by Pe
- this power level is called the erasing power level and is expressed by Pe
- a recording pattern including a mark as an amorphous region and a space as a crystalline region corresponding to a data signal is formed on the medium.
- the data is reproduced using the difference in the reflectance between the crystal and the amorphous. It is.
- a recording pulse As described above, in order to form a mark on a medium, it is necessary to modulate the power level of a laser beam between at least an erasing power level and a recording power level to emit light.
- the pulse waveform used for this modulation operation is called a recording pulse.
- Many recording methods for forming one mark with a plurality of recording pulses have already been disclosed. These multiple recording pulses are called a recording pulse train.
- optical information recording media such as DVD mainly use CLV (constant velocity) recording.
- CLV constant velocity
- recording is performed with almost the same linear velocity, transfer rate, and linear density over the entire surface of the medium.
- the rotation speed of the medium changes according to the recording / reproducing position (ie, the radial position) in the medium.
- the CAV recording method has the advantage that the spindle motor and its control circuit can be manufactured at low cost because the rotational speed control of the spindle motor that rotates the medium is not required. Further, after the seek operation at the recording / reproducing position, it is not necessary to wait for the recording / reproducing operation until the rotation speed reaches a predetermined value.
- the linear velocity and the transfer rate change depending on the recording / reproducing position in the medium. Therefore, the laser beam irradiation condition and the heating / cooling condition on the medium change depending on the recording / reproducing position.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2000-22819 (pages 3-5, FIG. 2)
- Patent Document 3 Japanese Unexamined Patent Publication No. Japanese Patent Publication No. 2001-1551 (see pages 5-7, Fig. 2))
- the above conventional recording / reproducing method has a problem that data cannot be stably recorded with good signal quality when the range of the linear velocity to be changed is wide. The problem will be described below.
- FIG. 16 is a diagram showing a signal for modulating a laser beam by a conventional recording / reproducing method to record a mark and a waveform of the laser beam.
- the laser The light can be modulated and emitted light between the recording power level Pw, the erasing power level Pe, and the inter-pulse power level Pbt.
- FIG. 17 is a diagram showing a signal for recording a mark by modulating a laser beam by a conventional recording / reproducing method and another waveform of the laser beam.
- 1/2 of the period Tw92 of the channel clock signal is If the rise time of the light is shorter than the sum of the rise time TU 2 and the fall time TD 2, the laser light cannot be modulated between the recording power level P w and the inter-pulse power level P bt.
- the power level of the light changes depending on the width of the light emission pulse. That is, since the power level at the time of modulation becomes indefinite, the mark cannot be stably formed in a desired shape.
- FIG. 18 shows a signal for recording a mark by modulating a laser beam by a conventional recording / reproducing method, and still another waveform of the laser beam.
- the following problem occurs at a high linear velocity.
- the width between each pulse is equal to the rise time and fall time of the laser. If it is shorter than the sum of the above, the laser beam cannot be modulated between the recording power level Pw and the inter-pulse power level Pbt as shown in FIG.
- FIG. 19 is a diagram showing a signal for recording a mark by modulating a laser beam by a conventional recording / reproducing method and still another waveform of the laser beam.
- the duty ratio of the recording pulse signal along the time axis with respect to the emission waveform it is usually realized by delaying the recording pulse signal using a delay line or the like.
- the change along is discrete. Therefore, in the CAV recording method, the duty ratio can only be changed discretely in response to a continuous change in linear velocity. As a result, the CAV recording method has a problem that recording characteristics vary depending on the recording position.
- the optical information recording apparatus is characterized in that a rotating optical information recording medium is irradiated with laser light to change the optical characteristics of the photosensitive recording film, and the length of the data recording code is changed to the length of the data recording code. Form a corresponding mark or space, and the mark is irradiated with the laser light whose power is switched between a plurality of power levels including at least a recording power level and an erasing power level.
- An optical information recording apparatus formed by the method, wherein a first linear velocity V1 and a second linear velocity V higher than the first linear velocity V1 with respect to the rotating optical information recording medium.
- a second inter-pulse power level indicating the power level between the recording pulses at the second linear velocity V 2 is P bt 2
- the first erase power level indicating the power level of the erase power at the first linear velocity V 1 is P e 1
- the power of the erase power at the second linear velocity V 2 When the second erasing power level indicating the level is P e2, the laser drive circuit controls the power of the laser light so that P btl ⁇ P el and P e2, and P bt 2 ⁇ P wa 2. It is characterized by controlling one level.
- Another optical information recording apparatus is to irradiate a rotating optical information recording medium with a laser beam to change the optical characteristics of a photosensitive recording film, thereby obtaining a long recording code length.
- the mark forms a mark or space corresponding to the length of the mark, and the mark is formed by irradiating the laser beam whose power is switched between a plurality of power levels including at least a recording power level and an erasing power level.
- An optical information recording device comprising: a first linear velocity V1 and a second linear velocity V2 higher than the first linear velocity V1 with respect to the rotating optical information recording medium.
- a linear velocity setting circuit to be set; and a recording pulse generator for generating a recording pulse signal according to a setting result of the linear velocity setting circuit.
- the first inter-pulse power level indicating the power level between the recording pulses is Pbt1
- the recording power level indicating the power level of the recording power at the second linear velocity V2 is Pwa2
- the second The second recording power level indicating the power level of the second recording power at the linear velocity V2 is P wb 2
- the first erasing power level indicating the power level of the erasing power at the first linear velocity V 1 Let P e 1 be the first erasing power level indicating the power level of the erasing power at the second linear velocity V 2, and let P bt 1 ⁇ P 2 el and P e2 PP wb 2 ⁇ P wa 2, and the waveform of the laser light at the second linear velocity v 2 is equal to the power level P wb 2 immediately after the recording pulse of the power level
- Still another optical information recording device is to irradiate a rotating optical information recording medium with laser light to change the optical characteristics of a photosensitive recording film, thereby reducing the length of a data recording code.
- the length forms a corresponding mark or space, and the mark is formed by irradiating the laser light whose power is switched between a plurality of power levels including at least a recording power level and an erasing power level.
- An optical information recording device comprising: a linear velocity setting circuit that sets a lower limit first linear velocity V1 and an upper limit second linear velocity V2 for the rotating optical information recording medium.
- a recording pulse generation circuit that generates a recording pulse signal in accordance with the setting result of the linear velocity setting circuit; and the laser beam is generated based on the recording pulse signal generated by the recording pulse generation circuit.
- a laser drive circuit for irradiating the information recording medium The power level between the recording pulses at the first linear velocity v1 is Pbt1, and the power level of the recording power at the second linear velocity V2 is The recording power level is Pwa2, the second recording power level indicating the power level of the second recording power at the second linear velocity V2 is Pwb2, and the erasing power at the first linear velocity V1 is The first erasing power level indicating the power level of the second erasing power is denoted by Pe1, the second erasing power level indicating the power level of the erasing power at the second linear velocity V2 is denoted by Pe2, and vl ⁇ v 0 ⁇ v 2, the power level of the second recording power at a linear velocity V of V Kv ⁇ v 2 is Pwb,
- the waveform of the laser beam is a step-like waveform in which the recording pulse of the power level Pwb2 is provided immediately after the recording pulse of the power level Pwa2. It is characterized in that the power level Pwb of the second recording power is controlled so that (Pwb-Pe) increases as the linear velocity V increases.
- Still another optical information recording device is to irradiate a rotating optical information recording medium with laser light to change the optical characteristics of a photosensitive recording film, thereby reducing the length of a data recording code.
- the length of the mark forms a corresponding mark or space, and the mark is formed by irradiating the laser light whose power is switched between a plurality of power levels including at least a recording power level and an erasing power level.
- An optical information recording device to be formed comprising: a first lower limit linear velocity V 1 and a second upper limit second velocity with respect to the rotating optical information recording medium.
- a linear velocity setting circuit that sets a linear velocity v2 of the linear velocity, a recording pulse generation circuit that generates a recording pulse signal in accordance with a setting result of the linear velocity setting circuit, and the recording that is generated by the recording pulse generation circuit.
- a laser drive circuit for irradiating the laser beam to the optical information recording medium based on a pulse signal, wherein a power level between the recording pulses at a linear velocity V of V 1 ⁇ ⁇ 2 is P bt, The power level of the erasing power at a linear velocity V is P e, and when vl ⁇ v 0 ⁇ v 2, when the linear velocity V is vl ⁇ v ⁇ V 0 and when the linear velocity V is V 0 ⁇ v ⁇ V2, the duty ratio of the recording pulse is constant, and when the linear velocity V is vl ⁇ v ⁇ v0 and when the linear velocity v is v0 ⁇ v ⁇ V2, The power level P bt between the recording pulses, And controlling so as
- the optical information recording method comprises: irradiating a rotating optical information recording medium with laser light to change the optical characteristics of the photosensitive recording film; Forming a corresponding mark or space, wherein the mark is formed by irradiating the laser light with the power switched between a plurality of power levels including at least a recording power level and an erasing power level.
- a linear velocity that sets a first linear velocity V1 and a second linear velocity V2 greater than the first linear velocity V1 for the rotating optical information recording medium.
- a first inter-pulse power level indicating a power level between the recording pulses in the first linear velocity V 1 and P bt 1 before A second inter-pulse power level indicating the power level between the recording pulses at the second linear velocity v 2 is P bt 2, and recording indicating the power level of the recording power at the second linear velocity V 2
- a power level is P wa 2
- a first erase power level indicating a power level of the erase power at the first linear velocity V 1 is P e 1
- the erase power at the second linear velocity V 2 is
- the laser driving step is performed such that P btl ⁇ P el and P e 2 ⁇ P bt 2 ⁇ P wa 2
- the laser driving step is performed such that P btl ⁇ P el and P e 2 ⁇ P bt 2 ⁇ P wa 2
- the feature is that the level is controlled.
- a rotating optical information recording medium is irradiated with a laser beam to change the optical characteristics of the photosensitive recording film, and the length of the recording code for one night is changed.
- the mark forms a mark or space corresponding to the length of the mark, and the mark is formed by irradiating the laser beam whose power is switched between a plurality of power levels including at least a recording power level and an erasing power level.
- An optical information recording method comprising: setting a first linear velocity V1 and a second linear velocity V2 higher than the first linear velocity V1 with respect to the rotating optical information recording medium.
- a laser driving step of irradiating the optical information recording medium with light wherein a first inter-pulse power level indicating a power level between the recording pulses at the first linear velocity V 1 is P bt 1, A recording power level indicating the power level of the recording power at the second linear velocity V2 is Pwa2, and a second recording power level indicating the power level of the second recording power at the second linear velocity V2 The level is defined as P wb 2, and a first level indicating the power level of the erasing power at the first linear velocity V 1 When the erasing power level is P e1, and the second erasing power level indicating the power level of the erasing power at the second linear velocity V 2 is P e 2, the laser driving step includes P bt 1 ⁇ P el and
- Still another optical information recording method is a method of irradiating a rotating optical information recording medium with laser light to change the optical characteristics of a photosensitive recording film, thereby reducing the length of a data recording code.
- the length forms a corresponding mark or space, and the mark is formed by irradiating the laser light with its power switched between a plurality of power levels including at least a recording power level and an erasing power level.
- a recording power level indicating the power level of the recording power at V2 is Pwa2
- a second recording power level indicating the power level of the second recording power at the second linear velocity V2 is Pwb2
- a first erase power level indicating the power level of the erase power at the first linear velocity V1 is Pel
- a second erase power level indicating the power erase level at the second linear velocity V2 Let P e 2 be When the power level of the second recording power at a linear velocity v of vl ⁇ v ⁇ v 2 is Pwb, and the power level of the era
- the power level Pwb is a stepped waveform provided with a recording pulse of the power level Pwb2, and the power level Pwb of the second recording power is increased as (Pwb ⁇ Pe) according to the increase of the linear velocity V. Is controlled.
- Still another optical information recording method is a method of irradiating a rotating optical information recording medium with laser light to change the optical characteristics of a photosensitive recording film, thereby reducing the length of a data recording code.
- the length forms a corresponding mark or space, and the mark is formed by irradiating the laser light whose power is switched between a plurality of power levels including at least a recording power level and an erasing power level.
- An optical information recording method comprising: setting a lower limit first linear velocity V1 and an upper limit second linear velocity V2 for the rotating optical information recording medium; A recording pulse generating step of generating a recording pulse signal according to a setting result of the linear velocity setting step; and the laser beam emitting the laser light based on the recording pulse signal generated by the recording pulse generating step.
- a laser driving step of irradiating the optical information recording medium wherein the power level between the recording pulses at a linear velocity V of V Kv ⁇ v 2 is P bt, and the power level of the erasing power at the linear velocity V is Pe
- V 1 ⁇ V 0 ⁇ V 2 when the linear velocity v is vl ⁇ v ⁇ v 0 and when the linear velocity v is v 0 ⁇ v ⁇ v 2
- the duty ratio of the recording pulse is constant, and when the linear velocity V is vl ⁇ v ⁇ V0 and when the linear velocity V is V0 ⁇ v ⁇ V2
- the power level Pbt is controlled so that (Pbt-Pe) increases with an increase in the linear velocity V.
- the optical information recording medium according to the present invention is an optical information recording medium on which data is recorded by the optical information recording method according to the present invention, wherein the first inter-pulse power level P bt1 and the second It is characterized in that information representing the value of the inter-pulse power level P bt 2 is recorded.
- Another optical information recording medium is an optical information recording medium on which data is recorded by the optical information recording method according to the present invention, wherein the first inter-pulse power level P bt1 and the Information indicating the value of the second recording power level P wb 2 is recorded.
- Still another optical information recording medium is an optical information recording medium on which data is recorded by the optical information recording method according to the present invention, wherein the value of the second recording power level P wb 2 is Characteristic information is recorded.
- Still another optical information recording medium is an optical information recording medium on which data is recorded by the optical information recording method according to the present invention, wherein the power level between the first pulses is Pbt1. It is characterized in that information indicating a value is recorded.
- Still another optical information recording medium is an optical information recording medium on which data is recorded by the optical information recording method according to the present invention, wherein a power level Pbt between the recording pulses and the recording It is characterized in that information indicating the value of the duty ratio of the pulse is recorded.
- Still another optical information recording medium is an optical information recording medium on which data is recorded by the optical information recording method according to the present invention, wherein the correction amount of the edge position of the recording pulse is It is characterized in that information indicating a value is recorded.
- FIG. 1 is a block diagram showing a schematic configuration of the optical information recording device according to the first embodiment.
- FIG. 2 is a flowchart showing the operation of the optical information recording device according to the first embodiment.
- FIG. 3 and FIG. 4 are signal waveform diagrams for explaining the operation of the optical information recording device according to the first embodiment.
- FIG. 5 is a flowchart showing the operation of the optical information recording device according to the second embodiment.
- 6 and 7 are signal waveform diagrams for explaining the operation of the optical information recording device according to the second embodiment.
- 8 (a) to 8 (c) are schematic diagrams for explaining the operation of the optical information recording device according to the third embodiment.
- 9 (a) to 9 (d) are schematic diagrams for explaining a modification of the operation of the optical information recording device according to the third embodiment.
- FIGS. 10 (a) to 10 (d) are schematic diagrams for explaining another modification of the operation of the optical information recording device according to the third embodiment.
- FIGS. 11 (a) to 11 (c) are schematic diagrams for explaining still another modified example of the operation of the optical information recording device according to the third embodiment.
- FIGS. 12A to 12E are schematic diagrams for explaining still another modified example of the operation of the optical information recording device according to the third embodiment.
- FIGS. 13 (a) to 13 (f) are schematic diagrams for explaining still another modified example of the operation of the optical information recording device according to the third embodiment.
- FIGS. 14A to 14B are schematic diagrams for explaining still another modified example of the operation of the optical information recording device according to the third embodiment.
- FIGS. 15 (a) and 15 (b) are schematic diagrams for explaining still another modification of the operation of the optical information recording device according to the third embodiment.
- FIG. 16 and FIG. 17 are signal waveform diagrams for explaining the operation of the conventional optical information recording device.
- FIG. 18 is a signal waveform diagram for explaining the operation of another conventional optical information recording device.
- FIG. 19 is a signal waveform diagram for explaining the operation of still another conventional optical information recording device.
- the power level between the first pulses indicating the power level between the recording pulses at the first linear velocity V1 is P bt1
- the second linear velocity V The power level between the second pulses indicating the power level between the recording pulses at 2
- the recording power level indicating the power level of the recording power at the second linear velocity V 2 is Pwa 2
- the first line When the first erase power level indicating the power level of the erase power at the speed V1 is P e1 and the second erase power level indicating the power level of the erase power at the second linear speed V2 is P e2
- the laser drive circuit controls the power level of the laser light so that P btl ⁇ P el and P e2, and P bt 2 ⁇ Pwa 2.
- the power P bt 1 between recording pulses at a low linear velocity and the power P bt 2 between recording pulses at a high linear velocity can be made different from each other.
- the power between recording pulses P bt 1 is lower than the erasing power P e 1 at low linear velocities, and the power P bt 2 between recording pulses at high linear velocities.
- the laser drive circuit includes: It is preferable that the power level P bt between the recording pulses is controlled between P btl and P bt2 so as to increase (P bt-P e) in response to the increase in the linear velocity V.
- the waveform of the recording pulse at a predetermined linear velocity V0 or more having a relationship of V1 ⁇ V0 ⁇ v2 is a rectangular wave.
- the optical information recording device irradiates a rotating optical information recording medium with laser light to change the optical characteristics of the photosensitive recording film, thereby obtaining the length of the recording code for one night.
- the mark forms a mark or space whose length corresponds to the mark, and the mark is formed by irradiating the laser beam whose power is switched between a plurality of power levels including at least a recording power level and an erasing power level.
- An optical information recording apparatus comprising: a first linear velocity V 1 and a second linear velocity V 2 higher than the first linear velocity V 1 with respect to the rotating optical information recording medium.
- a linear velocity setting circuit for setting a recording pulse signal, a recording pulse generating circuit for generating a recording pulse signal in accordance with a setting result of the linear velocity setting circuit, and a recording pulse signal generated by the recording pulse generating circuit.
- a drive circuit wherein a first pulse power level indicating a power level between the recording pulses at the first linear velocity V 1 is P bt 1, and the power level between the recording pulses at the second linear velocity V 2 is The power level of the second pulse indicating the power level of the second pulse is P bt2, the recording power level indicating the power level of the recording power at the second linear velocity V 2 is Pwa 2, and the first linear velocity A first erase power level indicating the power level of the erase power at V 1 is P e 1, and a second erase power level indicating the power level of the erase power at the second linear velocity V 2 is P e 2 Then, the laser driving circuit:
- FIG. 1 is a block diagram showing a schematic configuration of an optical information recording device 100 according to Embodiment 1 of the present invention.
- Reference numeral 1 is an optical disk for recording and reproducing data
- 2 is a system control circuit for controlling the entire optical information recording apparatus 100.
- Reference numeral 3 denotes a modulation circuit that generates a binarized recording data signal in accordance with data to be recorded
- reference numeral 4 denotes a recording pulse generation circuit that generates a pulse for driving a laser in accordance with the recording data signal.
- Reference numeral 5 denotes a laser drive circuit for modulating a current for driving a laser in the optical head 6 according to a pulse output from the recording pulse generation circuit.
- Reference numeral 6 denotes an optical head, which focuses the laser light and irradiates the optical disc 1 with the laser light.
- the path 7 is a linear velocity setting circuit for controlling the linear velocity (ie, rotation speed) of the optical disc 1.
- the path 8 is a spindle motor for rotating the optical disc 1.
- Reference numeral 9 denotes a reproduction signal processing circuit for performing waveform processing of a reproduction signal based on the reflected light from the optical disk 1
- reference numeral 10 denotes a demodulation circuit for obtaining reproduction data.
- FIG. 2 is a flowchart showing the operation of the optical information recording apparatus 100 according to the first embodiment.
- FIG. 3 is a waveform diagram showing an operation when recording at a low linear velocity in the optical information recording apparatus 100 according to Embodiment 1
- FIG. 4 shows an operation when recording at a high linear velocity.
- T represents a channel clock cycle.
- a recording pulse signal 12 composed of a total of three recording pulses is used to record a mark having a code length of 5T.
- the number of recording pulses or the total length of the recording pulse train changes according to the increase or decrease of the code length.
- the waveforms of the channel clock signal, the modulation signal 11, the recording pulse signal 12, the recording pulse level control signal 13, and the laser light 1 4 shows the light emission waveform of No. 4 and the states of the tracks 301 and 401 after the marks 302 and 402 are recorded by the laser light 14.
- the linear velocity setting circuit 7 rotates the spindle motor 8 based on the instruction of the system control circuit 2. To rotate the optical disc 1 at a predetermined linear velocity. Then, in the seek operation step S202, the optical head 6 seeks above a predetermined recording area on the optical disc 1.
- an operation for recording data particularly, in the case where recording is performed at a low linear velocity (that is, recording is performed at a low transfer rate) in the first embodiment will be described.
- the system control circuit 2 determines the optimum recording power level Pwa1 and the erasing power level Pe1 at this low linear velocity, and sends it to the laser drive circuit 5. Transmits the power setting signal 15.
- the recording power level Pwa1 and the erasing power level Pe1 may be determined by performing test recording on the optical disc 1. Further, if information indicating the recording power level Pwa1 and the erasing power level Pe1 is recorded on the control track area of the optical disc 1, even if the information is determined by reading this information. Good.
- the system control circuit 2 determines the recording pulse power level Pbt1 at the low linear velocity described above and sends it to the laser drive circuit 5. Sends the power setting signal 15.
- the power Pbt1 between recording pulses is set to be lower than the erasing power Pe1.
- the recording data from the system control circuit 2 is modulated by the modulation circuit 3 based on the channel clock signal shown in FIG.
- the modulation circuit 3 sends out the modulation signal 11 shown in FIG.
- the recording pulse generation circuit 4 generates the recording pulse signal 12 shown in FIG. 3 based on the modulation signal 11 transmitted by the modulation circuit 3.
- the level control signal 13 between recording pulses is sent to the laser drive circuit 5.
- the laser driving circuit 5 modulates the power level of the laser light 14.
- the laser beam 14 forms a mark 302 corresponding to the code length 5 T on the recording track 301.
- the period Tw 1 of the channel clock signal is longer than the rise time and fall time of the laser light, so that the laser light 14 has a recording power level Pwa1, an erase power level Pel, and a power level P between pulses. Modulation and light emission can be stably performed between the power levels of bt1. Therefore, the power level P bt 1 between the recording pulses can be made equal to or lower than the erasing power level P e 1, so that the heat generated when recording the rear part of the mark 302 is equal to that of the front part of the mark 302. can do. As a result, a mark 302 without distortion can be formed, and data can be recorded accurately.
- the signal waveforms of each part of the apparatus and the recording pattern on the track are as shown in FIG.
- the recording pulse power Pbt2 is set to be higher than the erasing power Pe2.
- the temperature of the recording film can be sufficiently increased even at a high linear velocity at which heat accumulation is small.
- the modulation range of the power level of the laser beam 14 is lower than that at low linear velocity. Because they are relatively narrow, the rise and fall times between each power level are also short. Since the width between recording pulses does not become extremely small, the laser beam can be stably modulated and emitted between power levels even at a high linear velocity.
- Embodiment 1 the point of Embodiment 1 is that the power between recording pulses P bt 1 at low linear velocities and the power P bt between recording pulses at high linear velocities are shown in the relationship between FIG. 3 and FIG. 2 are different from each other. Moreover, when the erasing powers P e1 and P e 2 at each linear velocity are used as a reference, the power between recording pulses P bt 1 is set to be equal to or less than the erasing power P el at low linear velocities, and the power between recording pulses at high linear velocities Set P bt 2 higher than the erasing power P e 2. As a result, a mark without distortion can be formed over a wide linear velocity range, and data can be accurately recorded.
- the configuration of the optical information recording apparatus according to the second embodiment and the operation when recording at a low linear velocity are the same as those described in the first embodiment.
- the operation when recording at a high linear velocity will be described below.
- FIG. 5 is a flowchart showing the operation of the optical information recording device according to the second embodiment.
- 6 and 7 are waveform diagrams showing the operation when recording is performed at a high linear velocity in the second embodiment.
- FIGS. 6 and 7 illustrate the operation of recording a mark having a code length of 5 T, similarly to FIGS. 3 and 4.
- the waveform of the channel clock signal, the waveform of the modulation signal 11, the waveform of the recording pulse signal 12, and the second recording power level control signal are shown.
- 3 shows the waveforms of the signals, the emission waveform of the laser light 14, and the state of the tracks 301 and 401 after the marks 302 and 402 are recorded by the laser light 14.
- the linear velocity setting circuit 7 controls the number of revolutions of the spindle motor 18 based on the command of the system control circuit 2, and drives the optical disc 1 at a predetermined linear velocity. Rotate. Then, in the seek operation step S502, the optical head 6 seeks above a predetermined recording area on the optical disc 1.
- the system control circuit 2 determines the optimum recording power level Pwa2 and the erasing power level Pe2 at this high linear velocity, and the laser drive circuit 5 Transmits the phase setting signal 15.
- the recording power level Pwa2 and the erasing power level Pe2 may be determined by performing test recording on the optical disc 1, as in the first embodiment. If information indicating the recording power and the erasing power is recorded on the control track area of the optical disc 1, the information may be determined by reading the information. The operation up to this point is the same as in the first embodiment.
- a second recording power level determination step S504 the system control circuit 2 determines the second recording power level P wb 2 at the above high linear velocity, and sends a power setting signal 1 to the laser drive circuit 5.
- the modulation step S505 the recording data from the system control circuit 2 is modulated by the modulation circuit 3 based on the channel feedback signal shown in FIG.
- the modulation circuit 3 sends out the modulation signal 11 shown in FIG.
- the recording pulse generation circuit 4 generates the recording pulse signal 12 shown in FIG. Sends the power level control signals 13 to the laser drive circuit 5. Put out.
- the laser driving circuit 5 modulates the power level of the laser light 14.
- the power level of the emission waveform of the laser light 14 changes as shown in FIG.
- the recording step S508 as shown in FIG.
- the laser beam 14 forms a mark 602 corresponding to the code length 5T on the recording track 601.
- the laser drive circuit 5 is controlled by the second recording power level control signal Pwb 2 instead of the recording pulse power level control signal Pbt1, )
- the combination of the signal levels of the recording pulse signal 1 2 and the second recording power level control signal 13 causes the laser light 14 to change from the first recording power level Pwa 2 to the second recording power level Pwb 2 (
- Pwa 2> Pwb 2> P e 2) the light emission changes stepwise
- the width of each step of the stepped emission waveform is longer than 12 of the cycle Tw 2 of the channel clock signal.
- the laser beam 1 4 can emit light stably at a desired power level. Also, since the power level when recording the front part of the mark 720 is higher than that at the rear part of the mark 720, the relative speed between the laser beam and the recording medium is high at a high linear velocity. However, sufficient energy can be given to the melting of the recording film at the start of recording of the mark 702, and the mark 702 can be formed stably, so that data can be accurately recorded. .
- the point of the second embodiment is that the second recording power level Pwb 2 is provided at the time of recording at a high linear velocity, as shown in FIGS.
- the change in the light emission waveform is step-like with a high power level when recording the front of the mark 720, and the width of each step of the step-like light emission waveform is larger than the channel clock signal period Tw2 and Tw3, 1Z2. Lengthen.
- the linear velocity, transfer rate, and transfer rate depend on the recording / reproducing position on the medium. Changes continuously.
- the light emission waveform at an intermediate linear velocity be determined by smoothly connecting the light emission waveform at a low linear velocity and the light emission waveform at a high linear velocity.
- FIGS. 8 (a) to 8 (c) show the setting of the power level between the recording pulses when the linear velocity changes continuously in the range from vl to V2 in the third embodiment.
- An example is shown.
- the laser beam 14 is emitted with the emission waveform shown in FIG. 8B at the linear velocity V1
- the laser beam 14 is emitted with the emission waveform shown in FIG. 8C at the linear velocity V2.
- This change may be linear, may be continuous with a monotonic smooth curve, or may be monotonic and gradually change.
- Such a method of continuously changing the power level between recording pulses in accordance with the linear velocity makes it easier to configure the apparatus than a method of continuously changing the width of the recording pulse as in the conventional example.
- FIGS. 9 (a) to 9 (d) are views showing a modification of the embodiment described in FIGS. 8 (a) to 8 (c).
- the power level Pbt between recording pulses is made equal to the recording power level Pwa2 (that is, a light emission waveform of a rectangular wave).
- FIGS. 10 (a) to 10 (d) are views showing other modified examples of the embodiment described in FIGS. 8 (a) to 8 (c).
- the linear velocity is higher than V0
- the power level Pbt between recording pulses is made equal to the recording power level Pwa2, and the width of the recording pulse is changed according to the linear velocity.
- the recording power is high at the high linear velocity where high-speed driving of the laser is required.
- Level Pwa 2 and erase power level Pe 2 Since it is only necessary to modulate the laser beam 14 with only the bell, the configuration of the laser drive circuit can be simplified, and there is an advantage that the circuit fabrication cost can be reduced.
- FIGS. 11 (a) to 11 (c) are views showing still another modification according to the third embodiment.
- FIGS. 11 (a) to 11 (c) show an example of setting the second recording power level when recording while the linear velocity continuously changes from V1 to V2. Is shown. At this time, the linear velocities v l and V 2 are both emitted with the waveform of the laser beam 14 shown in FIG. 6 or FIG.
- the second recording power level increases relative to the erase power levels Pel and Pe2 from Pwb1 to Pwb2. That is, it is desirable to set the value (Pwb-Pe) obtained by subtracting the erasing power level from the second recording power level as the linear velocity increases. .
- the recording film since there is no change in power level due to the recording pulse train, it is preferable to use the recording film in a high linear velocity range where a higher cooling rate can be obtained.
- FIGS. 12 (a) to 12 (e) show an embodiment in which recording can be performed at a lower linear velocity in addition to the range of recordable linear velocities in the embodiment shown in FIG. FIG.
- the sum of the rise time and the fall time is smaller than the width of the recording pulse (or the width between the recording pulses).
- the recording is performed by changing the duty ratio of the recording pulse according to the speed. Then, in the range of V 0 ⁇ linear velocity ⁇ V 2 where the linear velocity is higher than V 0, the light emission waveform is switched to the stepwise emission waveform as described in the second embodiment, and the second recording power level Pwb is changed according to the linear velocity. Record while changing 2. Thereby, data can be accurately recorded in a wider range than the embodiment shown in FIG.
- FIGS. 13 (a) to 13 (f) show an embodiment in which the duty ratio of the recording pulse is changed stepwise according to the linear velocity and the power level between the recording pulses is changed continuously.
- the constant recording pulse duty ratio is different in the range of V1 ⁇ linear velocity ⁇ V0 and in the range of V0 ⁇ linear velocity ⁇ V2.
- the linear velocity is continuously varied in the range of V 1 ⁇ linear velocity ⁇ V 0 and in the range of V 0 ⁇ linear velocity ⁇ V 2.
- the duty ratio of the recording pulse is changed according to the linear velocity as in the conventional example, usually the duty ratio can only be set discretely, so recording is performed according to the recording linear velocity (the recording position in the case of the CAV recording method). There was a problem that the characteristics varied.
- the power level between the recording pulses is changed within the linear velocity range where the duty ratio is equal, so that the recording characteristics The dispersion can be reduced.
- the edge position of the recording pulse at each linear velocity of vl and ⁇ are corrected based on the channel clock, and the recording device or the recording medium has information indicating the correction value.
- the recording device or the recording medium has information indicating the correction value.
- V 1 ⁇ linear velocity ⁇ v 0 use the edge position corrected at linear velocity V 1. If V 0 ⁇ linear velocity ⁇ V 2, use the edge position corrected at linear velocity V 0. By doing so, it is not necessary for the recording device or the recording medium to have a large number of edge position correction information for each minute linear velocity interval, so that the configuration of the recording device can be simplified and the recording medium can be used as the calibration value. Since the area required to hold the information that represents the data can be reduced, the area for recording data is reduced. It is possible to increase.
- FIGS. 14 (a) to 14 (b) and FIGS. 15 (a) to 15 (b) are views showing still another modification according to the third embodiment.
- the power P bt 1 between recording pulses is set to be equal to or less than the erasing power P e 1 at the low linear velocity V 1.
- the power P bt1 between recording pulses may be set to be equal to or higher than the erasing power P e1 at the low linear velocity v 1.
- Examples of the power setting method in each of Embodiments 1 and 3 include a recording power level Pwa 1 at a low linear velocity V 1, an erasing power level Pe 1, an inter-pulse power level P bt 1, and a high linear velocity.
- the recording power level Pwa2, the erasing power level Pe2, and the inter-pulse power level Pbt2 at the speed v2 are set so as to satisfy the following (Equation 1).
- the simplest method for determining the value of the changing power level is the linear velocity vl, V2 and The optimum power level value at V 0 was determined by test recording, during which the power level at linear velocity was
- the medium can be optically recorded. Immediately after mounting on the device, the power level can be determined according to the linear velocity. A point occurs.
- the information of the power level may be recorded on the medium by the optical information recording device, or may be recorded in advance when the medium is manufactured.
- the laser light can be stably modulated over a wide linear velocity range, and there is no distortion. Marks can be formed and data can be recorded accurately.
- the second recording power level is provided at the time of recording at a high linear velocity, and the change of the light emission waveform is made wider by making the power level higher stepwise when recording the front part of the mark.
- the laser beam can be stably modulated over the linear velocity range, a mark without distortion can be formed, and data can be recorded accurately.
- the modulation method, the length and position of each pulse are not limited to those described in each of the above embodiments, and appropriate ones can be set according to recording conditions and media. It is. Further, in order to avoid the influence of thermal interference between marks, the edge position of the recording pulse may be corrected. Further, a cooling pulse may be added after the recording pulse or the recording pulse train.
- the above method can be applied to any optical disk such as a phase change material, a magneto-optical material, a dye material, and the like, as long as the medium has different optical characteristics between the mark and the space.
- the optical information recording method of the present embodiment by changing the power P bt between recording pulses in accordance with the linear velocity, a wide The laser beam can be stably modulated over a wide range of linear velocities, and a mark without distortion can be formed, so that data can be recorded accurately.
- the second recording power level is provided at the time of recording at a high linear velocity, and the change in the light emission waveform is caused by a step having a higher power level when recording the front part of the mark.
- the laser beam can be stably modulated over a wider linear velocity range, a mark without distortion can be formed, and data can be accurately recorded.
- an optical information recording method capable of recording and reproducing data having stable and good signal quality over a wide linear velocity range on the same medium, An information recording device and an optical information recording medium can be provided.
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Description
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Priority Applications (6)
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JP2004546488A JPWO2004038705A1 (ja) | 2002-10-28 | 2003-10-28 | 光学的情報記録方法、光学的情報記録装置および光学的情報記録媒体 |
US10/532,946 US7116623B2 (en) | 2002-10-28 | 2003-10-28 | Optical information recording method, optical information recording device and optical information recording medium |
AU2003275691A AU2003275691A1 (en) | 2002-10-28 | 2003-10-28 | Optical information recording method, optcal information recording device and optica information recording medium |
DE60333773T DE60333773D1 (de) | 2002-10-28 | 2003-10-28 | Optisches informationsaufzeichnungsverfahren und optische informationsaufzeichnungseinrichtung |
AT03758963T ATE477573T1 (de) | 2002-10-28 | 2003-10-28 | Optisches informationsaufzeichnungsverfahren und optische informationsaufzeichnungseinrichtung |
EP03758963A EP1557828B1 (en) | 2002-10-28 | 2003-10-28 | Optical information recording method and optical information recording device |
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JP2002-312433 | 2002-10-28 |
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US (1) | US7116623B2 (ja) |
EP (1) | EP1557828B1 (ja) |
JP (2) | JPWO2004038705A1 (ja) |
KR (1) | KR100999737B1 (ja) |
CN (1) | CN100369125C (ja) |
AT (1) | ATE477573T1 (ja) |
AU (1) | AU2003275691A1 (ja) |
DE (1) | DE60333773D1 (ja) |
WO (1) | WO2004038705A1 (ja) |
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JP2009245592A (ja) * | 2009-07-31 | 2009-10-22 | Taiyo Yuden Co Ltd | 光ディスク記録方法、光ディスク記録再生装置及び光ディスク |
JP2011258308A (ja) * | 2005-03-31 | 2011-12-22 | Panasonic Corp | 光ディスク記録装置、光ディスクへのデータ記録方法、半導体集積回路、及び光ディスク |
CN114063237A (zh) * | 2021-11-26 | 2022-02-18 | 北京电子科技职业学院 | 一种多重限位的光学平台 |
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JP3859522B2 (ja) * | 2002-02-01 | 2006-12-20 | Tdk株式会社 | 光記録媒体への情報記録方法及び光記録媒体 |
TWI261825B (en) | 2002-12-16 | 2006-09-11 | Hitachi Maxell | Data recording method and data recording medium |
WO2005096279A1 (ja) * | 2004-03-30 | 2005-10-13 | Matsushita Electric Industrial Co., Ltd. | 情報記録方法、情報記録装置および情報記録媒体 |
JP2005293689A (ja) * | 2004-03-31 | 2005-10-20 | Sony Corp | 記録装置、記録方法 |
JP2007149275A (ja) * | 2005-11-30 | 2007-06-14 | Hitachi Ltd | 情報再生方法 |
JP2007157196A (ja) * | 2005-12-01 | 2007-06-21 | Hitachi Ltd | 光ディスク装置および記録パワー設定方法 |
JP4285538B2 (ja) * | 2006-12-26 | 2009-06-24 | ソニー株式会社 | ディスクドライブ装置 |
JP2009140582A (ja) * | 2007-12-07 | 2009-06-25 | Hitachi Ltd | 情報記録方法及び情報記録再生装置 |
JP4387439B2 (ja) * | 2008-03-31 | 2009-12-16 | 株式会社東芝 | 光ディスク装置および電源供給方法 |
JP2011118996A (ja) * | 2009-12-04 | 2011-06-16 | Hitachi-Lg Data Storage Inc | 光学式記録媒体の記録装置、及び光学式記録媒体の記録方法 |
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Also Published As
Publication number | Publication date |
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EP1557828A4 (en) | 2007-12-05 |
ATE477573T1 (de) | 2010-08-15 |
KR100999737B1 (ko) | 2010-12-08 |
KR20050071635A (ko) | 2005-07-07 |
EP1557828B1 (en) | 2010-08-11 |
CN1708790A (zh) | 2005-12-14 |
DE60333773D1 (de) | 2010-09-23 |
AU2003275691A1 (en) | 2004-05-13 |
EP1557828A1 (en) | 2005-07-27 |
JPWO2004038705A1 (ja) | 2006-02-23 |
US20060044968A1 (en) | 2006-03-02 |
CN100369125C (zh) | 2008-02-13 |
JP2010140635A (ja) | 2010-06-24 |
US7116623B2 (en) | 2006-10-03 |
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