WO1999021180A1 - Unite de support d'enregistrement optique - Google Patents
Unite de support d'enregistrement optique Download PDFInfo
- Publication number
- WO1999021180A1 WO1999021180A1 PCT/JP1998/004743 JP9804743W WO9921180A1 WO 1999021180 A1 WO1999021180 A1 WO 1999021180A1 JP 9804743 W JP9804743 W JP 9804743W WO 9921180 A1 WO9921180 A1 WO 9921180A1
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- Prior art keywords
- signal
- recording medium
- optical recording
- output
- circuit
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims abstract description 94
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000010586 diagram Methods 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000000149 penetrating effect Effects 0.000 description 5
- 239000004744 fabric Substances 0.000 description 2
- 241001061260 Emmelichthys struhsakeri Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- 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
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0938—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following servo format, e.g. guide tracks, pilot signals
-
- 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
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00745—Sectoring or header formats within a track
-
- 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
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
- G11B7/08541—Methods for track change, selection or preliminary positioning by moving the head involving track counting to determine position
-
- 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
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
Definitions
- the present invention relates to an optical recording medium drive device of a land z-group recording system that enables high-density recording by changing the height of adjacent tracks.
- DVD-ROM Digital Video Disc-ROM
- a rewritable optical recording medium corresponding to the capacity is required.
- a rewritable optical disc employs a land recording method or a groove recording method.
- Land Z group recording which can provide higher density recording. Up to a memory capacity of 640 MB is a land recording system, and a track count at the time of a seek is executed by a cross-track signal generated when the vehicle crosses the track.
- the Land Z group recording method cannot be used because the cross tracking signal becomes 0.
- the track count may be executed by a tracking error signal (TES). You.
- TES tracking error signal
- the ID pattern of the recording pattern of the Land Z group recording method becomes shallower, the pit must be increased so that a sufficient signal strength can be obtained. However, if the pit is made larger, the tracking error signal in the ID section becomes smaller, and a counting miss occurs in the track count.
- FIG. 1 is a block diagram showing a configuration example of a conventional optical recording medium drive device that performs recording, Z or reproduction using an optical disc of the Z-group recording system. This optical recording medium drive device is simply shown with a focus on a tracking error signal detection unit.
- the light output from 1 1 is shaped into a parallel circular beam by a beam shaper, passes through a beam splitter 1 1 2, and the optical path is bent by a start-up mirror 1 1 3
- the light is condensed by the lens 114 and irradiates the surface of the disk 110.
- the light diffracted by the surface group of the disk 110 passes through the objective lens 114 again, is reflected by the beam splitter 112, bends the optical path, and is split into two detectors 111. 5 is incident.
- FIG. 2 is a diagram showing diffracted light incident on the two-segment detector, and shows a state in which the two-segment detector in FIG. 1 is viewed from above (detection surface).
- the two-divided detector 115 the two divided detectors are arranged in the left-right direction in FIG.
- the two lights (first-order diffracted lights D,, D,) diffracted at the edges at both ends of the group are diffracted to the left and right by a predetermined angle, and a part of these first-order diffracted lights, D 1 are respectively shifted to the left and right.
- the light is incident on the detector.
- the 0th-order diffracted light D is located at the center of the two-split detector 115 across both detectors. Is incident. 0th and 1st order diffracted light D. , D! In the area where crossover occurs (the cross-hatched area in Fig. 2), the light intensity A cloth is generated, and each detecting unit detects the light intensity using the cloth.
- the divide-by-two detector 1 15 converts each of the split light and the input light into a current signal, and inputs the current signal to the current / voltage conversion circuits 1 16 and 1 17 respectively.
- the current Z-voltage conversion circuits 1 16 and 1 17 convert the input current signal into a voltage signal and output it.
- the voltage signals output from the current-to-Z voltage conversion circuits 1 16 and 1 17 are amplified by the amplifiers 1 1 18 and 1 19, respectively, and a difference signal is created by the differential amplifier 1 22.
- This difference signal is Output as a tracking error signal. Based on this tracking error signal, the objective lens 114 is auto-tracked and seeks.
- FIG. 3 is a diagram showing an example of an ID portion of an optical disk of the Land Z group recording system proposed by the present applicant, and shows a plan view thereof (see Japanese Patent Application Laid-Open No. H10-79125). No.).
- the hatched part is a part formed in a concave shape.
- information can be recorded in each track formed by the land section 102 and the group section 101 provided between the land section 102.
- the row of prepits 104 and 103 corresponding to the preformat information of the adjacent land part 102 and group part 101 is formed so as to be shifted in the circumferential direction. I have.
- a counting group 106 for track counting is formed on both sides of the row of the prepits 104 for the land section 102, and the prepits for the group section 101 are formed.
- a penetrating group 105 extending through the row 103 is formed.
- FIG. 4 is a waveform diagram showing TES (tracking error signal) obtained by a conventional optical recording medium drive device. Seek from such an optical disk by the optical recording medium drive shown in Fig. 1.
- the tracking error signal 201 at the time is created, as shown in FIG. 3, the TES 202 in the ID section (the dotted line indicates the tracking error signal 200 obtained in the recording area instead of the ID section)
- the drop due to the pre-pit 104 is larger than the tracking error signal in the recording area, and zero crossing occurs, causing a tracking count counting error. There was a problem to do.
- the present invention has been made to solve the above problems, and an object of the present invention is to provide an optical recording medium drive capable of obtaining a tracking error signal necessary for an accurate track count. To provide. Disclosure of the invention
- An optical recording medium drive device includes a plurality of optical recording medium drive devices each of which is capable of recording information on each of the plurality of tracks.
- an optical recording medium drive device for recording, Z or reproduction a detector for detecting the position of the irradiation light, a peak hold circuit for peak-holding and outputting a position detection signal output by the detector, A bottom hold circuit that bottom-holds and outputs the position detection signal; and a switching circuit that switches and outputs a signal based on output signals of the peak hold circuit and the bottom hold circuit. This signal is intended to be used as a tracking error signal.
- the signal output by the position detector is output after being peak-held by the peak hold circuit, and the signal output by the position detector is output by being bottom-held by the bottom hold circuit. .
- the switching circuit outputs a signal based on the output signal of the peak hold circuit.
- a signal based on the output signal of the bottom hold circuit is switched and output as a tracking error signal.
- the switching circuit includes an absolute value circuit that outputs an absolute value of a signal based on an output signal of the peak hold circuit, and an output signal of the bottom hold circuit.
- An absolute value circuit that outputs an absolute value of the signal; and a comparator circuit that compares the magnitudes of the absolute values output by the absolute value circuits and selects the larger one, and selects the larger one. Outputs a signal and performs tracking servo and seek.
- the two absolute value circuits output the absolute value of the signal based on the output signal of the peak hold circuit and the absolute value of the signal based on the output signal of the bottom hold circuit, respectively. Then, the comparison circuit compares the magnitudes of the respective absolute values output by the two absolute value circuits, and the switching circuit outputs the larger signal.
- the ID for land Z group recording that is effective when applied to the present invention is one in which the ID is formed as a pre-pit on the extension of the land and the extension of the group.
- FIG. 5 is a waveform diagram showing TES obtained by the optical recording medium drive device according to the present invention.
- the signal based on the output signal of the peak hold circuit is a signal 403 obtained by restoring the drop due to the pre-pit in the ID part of the land part
- the signal based on the output signal of the tom hold circuit is a signal 405 obtained by restoring the drop of the ID portion of the group portion due to the pre-pit portion, as shown in FIG. 5 (b).
- the dotted line in the figure is not the ID part, but the reproduced waveform when the optical spot crosses the land group.
- the amplitude of the signal 403 based on the output signal of the peak hold circuit is larger, and in the ID part of the group part, the signal 405 based on the output signal of the bottom hold circuit is larger.
- the amplitude of is larger. If the larger one is selected, the signal in which the drop in the ID section has been recovered will be selected, and the waveform will be closer to the waveform other than the ID section. As a result, a tracking error signal required for an accurate track count can be obtained.
- a two-segment detector is used as the position detector described above, and two signals output from the two-segment detector are peak-housed by two peak hold circuits and two bottom hold circuits, respectively. Hold and bottom-holds and outputs the signals.
- the switching circuit switches and outputs the signal based on the output signals of the two peak hold circuits and the signal based on the output signals of the two bottom-hold circuits. It is also possible to adopt a configuration such that
- one absolute value circuit outputs the absolute value of the signal based on the difference signal between the output signals of the two peak hold circuits, and the other absolute value circuit outputs the difference value of the output signals of the two bottom hold circuits.
- the absolute value of the signal based on the signal is output, the comparator circuit compares the absolute values output by both absolute value circuits, and the switching circuit outputs the larger signal. It is possible.
- Still another optical recording medium drive device of the present invention is a recording device for recording information on an optical recording medium based on light irradiated on the optical recording medium capable of recording information on each of the plurality of tracks. And a detector for detecting the position of the irradiation light, and a peak-hold circuit for peak-holding and outputting a difference signal between the respective position detection signals output from the detector. And hold the difference signal and output And a switching circuit for switching and outputting the output signals of the peak hold circuit and the bottom hold circuit, so that the signal output by the switching circuit becomes a tracking error signal.
- the peak hold circuit peak-holds and outputs the difference signal of each position detection signal output by the detector, and the bottom hold circuit outputs the position signal output by the detector. Bottom hold the difference signal of the detection signal and output.
- the switching circuit switches and outputs the output signals of the peak hold circuit and the bottom hold circuit to generate a tracking error signal. As a result, a tracking error signal necessary for an accurate track count can be obtained.
- Still another optical recording medium drive device of the present invention includes an absolute value circuit that outputs an absolute value of an output signal of the peak hold circuit, and an absolute value that outputs an absolute value of an output signal of the bottom hold circuit.
- a switching circuit for comparing the magnitudes of the absolute values output by the absolute value circuits and selecting a larger one, and outputting the signal selected by the comparison circuit to the switching circuit.
- the two absolute value circuits output the absolute value of the output signal of the peak hold circuit and the absolute value of the output signal of the bottom hold circuit, respectively. Then, the comparison circuit compares the magnitudes of the absolute values output by both absolute value circuits, selects the larger one, and causes the switching circuit to output the selected signal.
- the output signal of the peak hold circuit is a signal 4003 that has been restored from the drop due to the pre-pit in the ID part of the land, and the output signal of the bottom hold circuit Recovers from the drop due to the pre-pit in the ID part of the group part, as shown in Fig. 5 (b).
- the resulting signal is 4 0 5. Therefore, the amplitude of the output signal 403 of the peak hold circuit is larger in the ID section of the land section, and the amplitude of the output signal 405 of the bottom hold circuit is larger in the ID section of the group section. If you select the larger one, you will select the signal whose dip has been recovered, so that you can get the tracking error signal required for accurate track count. Can be.
- Still another optical recording medium drive device of the present invention is a recording device for recording information on an optical recording medium based on light irradiated on the optical recording medium capable of recording information on each of the plurality of tracks.
- a low-pass filter for removing a signal, and a signal based on the output of the low-pass filter is used as a tracking error signal.
- a low-pass filter filters the position detection signal output from the detector by a high frequency generated by pre-pitting, and is generated at each ID section of a land section and a group section.
- a signal based on the output of the low-pass filter is recovered as a tracking error signal by recovering each relatively high frequency drop, so that a tracking error signal required for accurate track count can be obtained.
- Still another optical recording medium drive device of the present invention is a recording device for recording information on an optical recording medium based on light irradiated on the optical recording medium capable of recording information on each of the plurality of tracks.
- an optical recording medium drive for reproduction comprising: a two-segment detector for detecting the position of the irradiation light; and a difference signal between the position detection signals output from the two-segment detector.
- Frequency components caused by pre-pits And a signal based on the output of the low-pass filter is used as a tracking error signal.
- the single pass filter filters the difference signal of the position detection signal output from the two-segment detector by the high frequency generated by the pre-pit, and outputs the signal to the land and the group.
- the signal based on the output of the rover filter is recovered as a tracking error signal by recovering each of the relatively high-frequency dips generated in each ID section of the unit, so that the traffic required for an accurate track count is obtained. It is possible to obtain Tsukingera signal.
- FIG. 1 is a block diagram showing a configuration example of a conventional optical recording medium drive device
- FIG. 2 is a diagram showing diffracted light incident on a two-segment detector
- FIG. 3 is a diagram showing an ID portion of an optical disc.
- FIG. 4 is a waveform diagram showing TES obtained by a conventional optical recording medium drive device
- FIG. 5 is a waveform diagram showing TES obtained by an optical recording medium drive device according to the present invention
- FIG. FIG. 6 is a block diagram showing a first embodiment of the optical recording medium drive device according to the present invention
- FIG. 7 is a block diagram showing a second embodiment of the optical recording medium drive device according to the present invention.
- FIG. 4 is a waveform diagram showing TES obtained by a conventional optical recording medium drive device
- FIG. 5 is a waveform diagram showing TES obtained by an optical recording medium drive device according to the present invention
- FIG. 6 is a block diagram showing a first embodiment of the optical recording medium drive device according to the present invention
- FIG. 8 is a block diagram showing a third embodiment of the optical recording medium drive device according to the present invention
- FIG. 9 is a block diagram showing a fourth embodiment of the optical recording medium drive device according to the present invention. It is. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 6 shows a first embodiment of the optical recording medium drive device according to the present invention.
- This drive device optical recording medium drive device
- TES tracking error signal
- the light diffracted by the surface group of the disk 110 passes through the objective lens 114 again, is reflected by the beam splitter 112, is bent in the optical path, and is split into two detectors 115. Is incident on.
- the two-divided detector 115 has its two divided detectors arranged in the left-right direction in FIG.
- the two lights (first-order diffracted lights D,, D,) diffracted at the edges at both ends of the group are diffracted by a predetermined angle in the horizontal direction, and these first-order diffracted lights D,, D! Are incident on the left and right detectors, respectively.
- the 0th-order diffracted light Do is incident on the center of the two-segment detector 115 straddling both detectors. 0th and 1st order diffracted light D.
- the light intensity distribution is generated due to the interference effect due to the track deviation, and each detecting unit detects the light intensity using this.
- the two-split detector 115 converts the split light and the input light into current signals, respectively, and inputs them to the current-Z voltage conversion circuits 116, 117, respectively.
- the current-to-voltage converters 1 16 and 1 17 convert the input current signal into a voltage signal and output it.
- the signal is amplified by amplifiers 118 and 119.
- the voltage signal amplified by the amplifier 118 is supplied to the peak hold circuit 311 and the bottom hold circuit 312, and the peak hold and the bottom hold, respectively, are output.
- the voltage signal amplified by the amplifier 119 is supplied to the peak hold circuit 311a and the bottom hold circuit 312a, and the peak hold circuit and the bottom hold circuit, respectively, are output.
- Each voltage signal peak-holded and output by the peak-hold circuits 311 and 311a is input to the differential amplifier 313, and the differential amplifier 313 outputs the difference signal. Then, it is given to the switching circuit 316 (switching circuit) and the absolute value circuit 314.
- Each of the voltage signals output and stored by the bottom hold circuits 3 1 2 and 3 1 2a is input to the differential amplifier 3 13a, and the differential amplifier 3 13a outputs the difference signal.
- the signal is output to the switching circuit 316 and the absolute value circuit 308.
- Each absolute value output by the absolute value circuits 3 08 and 3 14 is given to the comparison circuit 3 15.
- the comparison result of the comparison circuit 315 is given to the switching circuit 316, and the switching circuit 316 receives the comparison result of the comparison circuit 315 which is the larger of the differential amplifiers 313, 313.
- 3 Outputs the difference signal output by a as a tracking error signal. Based on this tracking error signal, the auto tracking is applied to the objective lens 114 and seek is performed.
- this optical disc has tracks formed by a land section 102 and a group section 101 provided between the land sections 102. Information can be recorded. Columns of the prefixes 104 and 103 corresponding to the pre-format information of the adjacent land part 102 and groove part 101 are formed shifted in the circumferential direction. Have been To
- Counting groups 106 for track counting are formed on both sides of the row of prepits 104 for the land section 102, and prepits 10 for the group section 101.
- a group of 105 is formed through three rows.
- the output of the peak hold circuits 311 and 311a is generated.
- the difference signal output from the differential amplifier 313, which is a signal based on the signal recovers the drop due to the pre-pit 104 in the ID section of the land section.
- the resulting signal is 4003 (however, the drop 402 caused by the penetrating groove 105 in the ID section of the group cannot be recovered).
- the difference signal output from the differential amplifier 313a which is a signal based on the output signal of the bottom hold circuit 312, 312a, is output from the group section as shown in Fig. 5 (b).
- a signal 405 is obtained by restoring the drop caused by the penetrating group 105 in the ID section (however, the drop 406 caused by the pre-pit 104 in the ID section in the land cannot be recovered).
- the comparison result of the comparison circuit 315 indicates the amplitude of the signal based on the output signals of the peak hold circuits 311 and 311a in the signals 403 and 406 due to the ID section in the land section. (403) becomes larger, and the signals 402 and 405 of the ID part of the group part have larger signal amplitudes (based on the output signals of the bottom hold circuits 312 and 312a). 4 0 5) becomes large, and if the switching circuit 3 15 selects the larger one, the signal from which the drop has been recovered will be selected, and the traffic required for accurate track counting will be selected. It is possible to obtain the signal of the locking error. (Second embodiment)
- FIG. 7 shows a second embodiment of the optical recording medium drive device according to the present invention.
- this drive device optical recording medium drive device
- voltage signals output from the current / voltage conversion circuits 116 and 117 are amplified by amplifiers 118 and 119, respectively.
- the voltage signals amplified by the amplifiers 118 and 119 are input to a differential amplifier 508, which outputs the difference signal, and outputs a peak hold circuit 509 and a peak hold circuit 509. Provided to the bottom hold circuit 5110.
- the voltage signal peak-held by the peak hold circuit 509 and output is supplied to a switching circuit 513 (switching circuit) and an absolute value circuit 511.
- the voltage signal that has been subjected to the bottom hold by the bottom hold circuit 510 and output is supplied to the switching circuit 513 and the absolute value circuit 505.
- the absolute values output by the absolute value circuits 505 and 511 are supplied to the comparison circuit 512.
- the comparison result of the comparison circuit 5 12 is given to the switching circuit 5 13, and the switching circuit 5 13 receives the comparison result of the comparison circuit 5 12, whichever is larger, the peak hold circuit 5 09 or the button.
- the voltage signal output by the Tom Hold circuit 510 is output as a tracking error signal. Based on this tracking error signal, the objective lens 114 is auto-tracked and seeks.
- Other configurations are the same as those of the drive device of FIG. 6 described above, and thus description thereof will be omitted.
- the output signal of the peak hold circuit 509 becomes as shown in FIG.
- the signal 4003 is obtained by recovering from the drop due to the pre-pit 104 of the ID part of the land (however, the penetrating group 1005 of the ID part of the group part). 4 2 cannot be recovered).
- the output signal of the bottom hold circuit 510 becomes a signal 405 obtained by restoring the drop due to the penetrating group 105 of the ID part of the group ( However, the drop 406 caused by the pre-pit 104 in the ID part of the land cannot be recovered.
- the comparison result of the comparison circuit 512 is that the amplitude of the output signal of the peak hold circuit is smaller in the signals 400 and 406 due to the ID section in the land section.
- the amplitude of the output signal of the bottom hold circuit (405) becomes larger, and if the switching circuit 511 selects the larger one, the signal whose dip has been recovered will be selected. As a result, a tracking error signal required for an accurate tracking count can be obtained.
- FIG. 8 is a block diagram showing a third embodiment of the optical recording medium drive device according to the present invention.
- this drive device optical recording medium drive device
- the voltage signals output from the current / voltage conversion circuits 116 and 117 are amplified by the amplifiers 118 and 119, respectively.
- Each of the voltage signals amplified by the amplifiers 118 and 119 cuts off the frequency signal exceeding the frequency of the tracking error signal excluding the ID part when the optical head moves at the maximum speed.
- the filter circuits 52 0 and 52 1 mouth-to-pass filter
- the voltage signals filtered by the filter circuits 52 0 and 52 1 are respectively input to the differential amplifier 52 2, and the differential amplifier 52 2 uses the difference signal as a tracking error signal. Output. Based on this tracking error signal, the objective lens 114 Is sought and the seek is performed.
- Other configurations are the same as those of the drive device of FIG. 6 described above, and thus description thereof will be omitted.
- the voltage signals amplified by the filter circuits 520 and 521 are amplified by the power amplifiers 118 and 119, and the ID signals of the land unit and the group unit are filtered.
- the relatively low-frequency dips generated in the voltage section are recovered, and the differential amplifier 522 uses the recovered difference signal of each voltage signal as a tracking error signal, so that an accurate track count can be obtained.
- the required tracking error signal can be obtained.
- FIG. 9 is a block diagram showing a fourth embodiment of the optical recording medium drive device according to the present invention.
- this drive device optical recording medium drive device
- voltage signals output from current / voltage conversion circuits 116 and 117 are amplified by amplifiers 118 and 119, respectively.
- Each of the voltage signals amplified by the amplifiers 118 and 119 is input to a differential amplifier 523, and the differential amplifier 523 outputs the difference signal.
- the difference signal output from the differential amplifier 523 is sent to a filter circuit 524 (low-pass filter) that blocks a frequency signal exceeding the frequency of the tracking error signal excluding the ID part when moving at the maximum speed.
- the signal is filtered and output as a tracking error signal. Based on this tracking error signal, the objective lens 114 is subjected to auto tracking and seek is performed.
- Other configurations are the same as those of the above-described drive device of FIG. 6, and thus the description thereof is omitted.
- the amplitude of the signal based on the output signal of the peak hold circuit is larger in the ID section of the land section, and the output signal of the bottom hold circuit is larger in the ID section of the group section. Based on this, the amplitude of the signal becomes larger, and if you select the larger one, you will select the signal from which the dip has been recovered, so the tracking error signal required for an accurate track count Can be obtained.
- the low-pass filter filters the detection signal output by the detector, and recovers each of the relatively high-frequency dip portions generated in the ID portions of the land portion and the group portion. Therefore, a signal based on the output of the low-pass filter is used as a tracking error signal, so that a tracking error signal necessary for an accurate track count can be obtained.
- the low-pass filter filters a difference signal between the detection signals output from the two-divided detector, and a relatively high frequency generated in each of the ID portions of the land portion and the group portion. Since each drop is recovered and a signal based on the output of the low-pass filter is used as a tracking error signal, a tracking error signal required for an accurate track count can be obtained.
- the detection signal is converted from current to voltage. Therefore, processing such as amplification, comparison, and filtering can be easily performed, and a tracking error signal necessary for an accurate track count can be obtained.
- the present invention can be applied to a conventional recording medium of a land recording system and a group recording system, and has backward compatibility.
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- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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DE69830419T DE69830419T2 (de) | 1997-10-20 | 1998-10-19 | Laufwerk fuer optisches aufzeichnungsmedium |
EP98947958A EP1026673B1 (en) | 1997-10-20 | 1998-10-19 | Optical recording medium drive |
US09/545,869 US6646961B1 (en) | 1997-10-20 | 2000-04-06 | Optical recording medium driving apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9/287475 | 1997-10-20 | ||
JP28747597A JP3753517B2 (ja) | 1997-10-20 | 1997-10-20 | 光記録媒体ドライブ装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/545,869 Continuation US6646961B1 (en) | 1997-10-20 | 2000-04-06 | Optical recording medium driving apparatus |
Publications (1)
Publication Number | Publication Date |
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WO1999021180A1 true WO1999021180A1 (fr) | 1999-04-29 |
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PCT/JP1998/004743 WO1999021180A1 (fr) | 1997-10-20 | 1998-10-19 | Unite de support d'enregistrement optique |
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US (1) | US6646961B1 (ja) |
EP (1) | EP1026673B1 (ja) |
JP (1) | JP3753517B2 (ja) |
DE (1) | DE69830419T2 (ja) |
WO (1) | WO1999021180A1 (ja) |
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JP3615054B2 (ja) | 1998-06-04 | 2005-01-26 | ソニー株式会社 | 光学記録媒体 |
JP2003196858A (ja) * | 2001-12-27 | 2003-07-11 | Texas Instr Japan Ltd | トラッキングエラー検出装置 |
JP2006172581A (ja) * | 2004-12-15 | 2006-06-29 | Hitachi Ltd | 情報記録装置、情報再生装置 |
KR100701733B1 (ko) * | 2005-10-11 | 2007-03-29 | 주식회사 히타치엘지 데이터 스토리지 코리아 | 광디스크장치의 최적 라이트 스트러티지 검출방법 |
DE102017202295A1 (de) * | 2017-02-14 | 2018-08-16 | Robert Bosch Gmbh | Schaltungsanordnung zum Durchführen eines Vergleichs |
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JPS573232A (en) * | 1980-06-06 | 1982-01-08 | Toshiba Corp | Detecting method for track on optical disk |
JPS5891536A (ja) * | 1981-11-25 | 1983-05-31 | Hitachi Ltd | デイジタル光デイスクのアクセス方式 |
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JPH01169742A (ja) * | 1987-12-24 | 1989-07-05 | Nec Corp | トラック極性検出装置 |
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US4669416A (en) | 1986-06-25 | 1987-06-02 | Metoramic Sciences, Inc. | Composite carrier plate |
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JPH0423234A (ja) * | 1990-05-18 | 1992-01-27 | Sony Corp | 光学装置のトラッキング誤差信号生成装置 |
US6118752A (en) * | 1995-07-07 | 2000-09-12 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium offset pre-pit array indicating identification information |
JP3633069B2 (ja) * | 1995-12-15 | 2005-03-30 | 富士通株式会社 | 光ディスク装置 |
JP3846925B2 (ja) * | 1995-12-22 | 2006-11-15 | パイオニア株式会社 | トラッキングエラー信号の波形制御装置 |
JP3633095B2 (ja) * | 1996-04-22 | 2005-03-30 | 富士通株式会社 | 光学的記憶装置 |
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JPH10269593A (ja) * | 1997-03-25 | 1998-10-09 | Hitachi Ltd | 光スポット位置制御装置 |
-
1997
- 1997-10-20 JP JP28747597A patent/JP3753517B2/ja not_active Expired - Fee Related
-
1998
- 1998-10-19 EP EP98947958A patent/EP1026673B1/en not_active Expired - Lifetime
- 1998-10-19 WO PCT/JP1998/004743 patent/WO1999021180A1/ja active IP Right Grant
- 1998-10-19 DE DE69830419T patent/DE69830419T2/de not_active Expired - Fee Related
-
2000
- 2000-04-06 US US09/545,869 patent/US6646961B1/en not_active Expired - Fee Related
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JPS573232A (en) * | 1980-06-06 | 1982-01-08 | Toshiba Corp | Detecting method for track on optical disk |
JPS5891536A (ja) * | 1981-11-25 | 1983-05-31 | Hitachi Ltd | デイジタル光デイスクのアクセス方式 |
JPS63122024A (ja) * | 1986-11-12 | 1988-05-26 | Nec Corp | トラツククロスパルス発生器 |
JPH01169742A (ja) * | 1987-12-24 | 1989-07-05 | Nec Corp | トラック極性検出装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1026673B1 (en) | 2005-06-01 |
EP1026673A1 (en) | 2000-08-09 |
DE69830419T2 (de) | 2005-11-10 |
US6646961B1 (en) | 2003-11-11 |
JPH11126343A (ja) | 1999-05-11 |
EP1026673A4 (en) | 2001-01-31 |
JP3753517B2 (ja) | 2006-03-08 |
DE69830419D1 (de) | 2005-07-07 |
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