WO2005020216A1 - 光情報記録媒体、媒体特性規定方法、媒体特性検査方法、信号検出方法、信号検出回路、及び光情報記録再生装置 - Google Patents
光情報記録媒体、媒体特性規定方法、媒体特性検査方法、信号検出方法、信号検出回路、及び光情報記録再生装置 Download PDFInfo
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- WO2005020216A1 WO2005020216A1 PCT/JP2004/010830 JP2004010830W WO2005020216A1 WO 2005020216 A1 WO2005020216 A1 WO 2005020216A1 JP 2004010830 W JP2004010830 W JP 2004010830W WO 2005020216 A1 WO2005020216 A1 WO 2005020216A1
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- recording
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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
- G11B7/08—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
- G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
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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
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
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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
- G11B7/08—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
- G11B7/094—Methods and circuits for servo offset compensation
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10481—Improvement or modification of read or write signals optimisation methods
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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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
Definitions
- Optical information recording medium medium characteristics defining method, medium characteristics inspection method, signal detection method, signal detection circuit, and optical information recording / reproducing device
- the present invention relates to a recordable optical information recording medium having a multilayer structure of two or more layers, such as a two-layer version of CD-R / RW, a two-layer version of DVD ⁇ RZRW, and a future multilayer recording medium.
- the present invention relates to a method for defining a medium characteristic, a method for inspecting a medium characteristic, a signal detection method, a signal detection circuit, and an optical information recording / reproducing apparatus.
- CD-RZRW and DVD ⁇ RZRW are said to have been established as external storage devices for PCs.
- CD-RZRW and DVD ⁇ RZRW are expected to have larger capacities in the future, and two-layered and further multi-layered in the future are being studied.
- the interlayer distance is basically set so that light reflected from a recording layer other than during access is not leaked into reflected light of a recording layer force during access. If the focus position deviates significantly, the reflected light from the medium diverges without being condensed by the lens, so that the signal intensity becomes a negligible level as the signal intensity.
- all layers must be set within the allowable focus range (depth of focus) where good various characteristics can be obtained, and the interlayer distance cannot be expanded as ideally. For this reason, leakage of reflected light from other layers occurs to some extent.
- Patent Documents 1 and 2 A medium having a plurality of recordable layers is disclosed in Patent Documents 1 and 2, for example. Yes. These inventions relate to recording film characteristics of media capable of multi-layer recording, particularly the thickness of the recording film.
- Patent Document 3 discloses that a wobble is arranged in each layer of a multilayer recording medium, and address information is inserted into the wobble.
- Patent Document 1 Japanese Patent Laid-Open No. 2000-235733
- Patent Document 2 JP 2003-091874
- Patent Document 3 Japanese Patent Application Laid-Open No. 2001-052342
- the reflectance is low, so that the reflected light is small, and the problem caused by leakage into the recording layer during access can be reduced.
- An object of the present invention is to reduce variations and errors in measurement of various signal characteristics due to light leaking from an adjacent recording layer, and to improve media parameters with high reliability, compatibility, and reproducibility. Management, regulation, and inspection.
- the present invention provides the following optical information recording medium to achieve the above object.
- An optical information recording medium having a plurality of recordable recording layers, wherein, among the plurality of recording layers, various signal characteristics in a certain region X of a certain recording layer A are a light beam applied to the region X.
- the optical information recording medium defined by the condition that the area Y of the recording layer B adjacent to the recording layer A on the incident side on the ray axis is a recorded area.
- Power S can.
- the values of the various signal characteristics may be equal values in the plurality of recording layers as target values. This makes it possible to use an inexpensive evaluation device and a recording / reproducing device that do not need to change the characteristics of various detection circuits for each layer.
- the various signal characteristics are also determined by the condition that the area Y is an unrecorded area, and the various signal characteristics in the area X determined by the condition that the area Y is a recorded area.
- the properties may be different.
- Tuning can also be performed with emphasis on improving characteristics under recording conditions.
- One of the various signal characteristics may be an amplitude of a track cross signal obtained when a light beam crosses a track. As a result, it is possible to obtain good signal quality with small variations in the amplitude of the track cross signal, and it is possible to cope with a recording / reproducing apparatus having a high access speed.
- One of the various signal characteristics may be an amplitude of a track error signal obtained when the light beam crosses the track. As a result, it is possible to obtain good signal quality with less variation in the amplitude of the track error signal, and it is possible to respond to a recording / reproducing apparatus having a high access speed and stable tracking performance.
- One of the various signal characteristics may be an amplitude of a wobble signal that is a meandering component of a track. As a result, it is possible to obtain good signal quality with little variation in the amplitude of the wobble signal, and it is possible to respond to a recording / reproducing apparatus with a fast access speed and stable media rotation and address detection performance.
- One of the various signal characteristics may be noise quality of a wobble signal that is a meandering component of a track. As a result, it is possible to obtain good wobble signal quality, and it is possible to respond to a recording / reproducing apparatus having a fast access speed and stable media rotation and address detection performance.
- various signal characteristics in a certain region X of a certain recording layer A among the plurality of recording layers were irradiated to the region X.
- the values of the various signal characteristics may be set to be equal values in the plurality of recording layers as target values. This makes it possible to use an inexpensive evaluation device and a recording / reproducing device that do not need to change the characteristics of various detection circuits for each layer.
- the various signal characteristics are defined under the condition that the region ⁇ is an unrecorded region, and the various signal characteristics in the region X defined by the condition that the region ⁇ is a recorded region. You may make it different. This eliminates the need for complicated tuning of various parameters to satisfy the signal characteristics under both unrecorded and recorded conditions, shortens the development period, and reduces recorded conditions that are disadvantageous for recording and playback operations. Tuning can be performed with emphasis on the characteristics improvement at the point.
- One of the various signal characteristics may be an amplitude of a track cross signal obtained when the light beam crosses the track. As a result, it is possible to obtain good signal quality with a small variation in the amplitude of the track cross signal, and it is possible to cope with a recording / reproducing apparatus having a high access speed.
- One of the various signal characteristics may be an amplitude of a track error signal obtained when the light beam crosses the track. As a result, it is possible to obtain good signal quality in which the amplitude variation of the track error signal is small, and it is possible to cope with a recording / reproducing apparatus having a fast access speed and stable tracking performance.
- One of the various signal characteristics may be the amplitude of a wobble signal that is a meandering component of a track. As a result, it is possible to obtain good signal quality in which the amplitude variation of the wobble signal is small, and it is possible to cope with a recording / reproducing apparatus having a fast access speed and stable media rotation and address detection performance.
- One of the various signal characteristics may be a noise quality of a wobble signal that is a meandering component of a track. As a result, good signal quality can be obtained, and It is possible to respond to recording / reproducing devices with high speed and stable media rotation and address detection performance.
- the recording layer A is adjacent to the recording layer A on the incident side on the optical axis of the light beam irradiated to a certain region X of the certain recording layer A.
- the reflection signal level of the area X when the area Y of the recording layer B is an unrecorded area is compared with the reflection signal level of the area X when the area Y is a previously recorded area.
- a sample circuit for holding a reflection signal level of a certain area X of a certain recording layer A, and a light beam of an optical beam applied to the area X
- a recording state discriminating circuit for discriminating whether the area Y of the recording layer B adjacent to the recording layer A on the incident side on the axis is an unrecorded area or a recorded area force;
- a storage circuit for storing the output of the sampler circuit held in the sampler circuit, and a signal difference between the unrecorded area and the recorded area when the area Y output from the storage circuit is not recorded
- a signal correction circuit for changing the amplification factor or offset of various signals using the output of the comparison circuit and the reflection signal level of the area X as a control signal, and the output of the recording state determination circuit.
- optical information recording / reproducing device is provided.
- a pickup having a rotating mechanism for rotating and driving the optical information recording medium, a light source, and an objective lens, for irradiating the optical information recording medium with a light beam and receiving reflected light from the optical information recording medium;
- the optical information recording / reproducing apparatus may include the signal detection circuit. As a result, an information recording / reproducing apparatus having stable and reliable servo performance and high-speed access performance can be realized regardless of the recording state of the adjacent recording layer.
- the values of the various signal characteristics may be set to be equal values in the plurality of recording layers as target values. This makes it possible to use an inexpensive inspection device and a recording / reproducing device that do not need to change the characteristics of various detection circuits for each layer.
- the various signal characteristics are inspected under the condition that the area Y is an unrecorded area, and the various signal characteristics in the area X inspected under the condition that the area Y is a recorded area. May be different. This eliminates the need for complicated tuning of various parameters to satisfy the signal characteristics under both unrecorded and recorded conditions, shortens the development period, and reduces recorded conditions that are disadvantageous for recording and playback operations. Tuning can be performed with emphasis on the characteristics improvement at the point.
- One of the various signal characteristics may be an amplitude of a track cross signal obtained when the light beam crosses the track. As a result, it is possible to obtain good signal quality with less variation in the amplitude of the track cross signal, and it is possible to cope with a recording / reproducing apparatus having a high access speed.
- One of the various signal characteristics may be an amplitude of a track error signal obtained when the light beam crosses the track. As a result, it is possible to obtain good signal quality with less variation in the amplitude of the track error signal, and to achieve a high access speed and stable tracking. It is possible to cope with a recording / reproducing device.
- one of the various signal characteristics may be defined as the amplitude of a wobble signal that is a meandering component of a track.
- One of the various signal characteristics may be noise quality of a wobble signal which is a meandering component of a track. As a result, good quality of the wobble signal can be obtained, and it is possible to cope with a recording / reproducing apparatus having a fast access speed and stable media rotation and address detection performance.
- the present invention measurement variations and errors of various signal characteristics due to light leaking from an adjacent recording layer are suppressed, and media parameters with high reliability, compatibility, and reproducibility are obtained. Management, regulation, and inspection of data.
- FIG. 1 is a diagram showing an optical information recording medium that is general and also applied to the present embodiment.
- FIG. 2 is a block diagram showing a basic configuration example of a signal processing block for extracting various signals.
- FIG. 3 is a schematic diagram for explaining the principle of recording and reproduction of a two-layer recording medium.
- FIG. 4 is a schematic diagram for explaining the effect of reflected light from each layer in the case of a two-layer recording medium.
- FIG. 5 is a schematic diagram for explaining the influence of reflected light from each layer in the case of a two-layer recording medium in terms of a signal level.
- FIG. 6 is a block diagram showing a configuration example for normalization processing of various signals.
- FIG. 7 is a diagram showing a waveform example of a track cross signal and a track error signal.
- FIG. 8 is a diagram showing an example of a waveform of a wobble signal.
- FIG. 9 is a diagram showing a waveform example of a wobble signal detected from a recorded area.
- FIG. 10 is a block diagram illustrating an example of a signal detection circuit.
- FIG. 11 is a block diagram showing another example of the signal detection circuit.
- FIG. 12 is a block diagram showing a configuration example of an optical disc device. Explanation of reference numerals
- FIG. 1 is a diagram showing a configuration example of an optical information recording medium (media) 1 which is general and is also applicable to the present embodiment.
- FIG. 1 (a) is a schematic plan view of the medium 1
- FIG. 1 (b) is a schematic perspective view showing a part of the medium 1 extracted.
- a track 4 composed of a gnoreve (groove) 2 and a land 3 is formed concentrically or spirally.
- the track 4 is formed in advance by a media forming apparatus.
- the information recording / reproducing apparatus records and reproduces information along the track 4.
- the track 4 meanders in the medium 1 so that a signal of a constant frequency (period) can be detected when rotating at a constant linear velocity or a constant angular velocity as rotation information (Fig. 1 (b) reference).
- address information is recorded by providing a part that slightly changes the frequency and phase while keeping the meandering of track 4 at a substantially constant frequency. Others meander only on one side of the truck, or intermittently.
- FIG. 2 shows an example of a signal processing block that receives reflected light of a light beam applied to the medium 1 and extracts various signals.
- Light reflected from the media 1 is received by the 4-divided PD (light receiving element) 11.
- the four-divided light receiving element 11 is optically divided into four light receiving areas by dividing lines corresponding to the track tangent direction on the media surface and the direction perpendicular thereto. Each light receiving area is referred to as A-D clockwise from the left front for convenience.
- the IZV circuit 12 converts a light-receiving element output, which is a current signal, into a voltage signal.
- various signals are extracted from the voltage-converted signal by the addition amplifier, the subtraction amplifier, the LPF (low-pass filter) or the HPF (high-pass filter) of the servo / wobble detection circuit 13.
- the track cross signal is a low frequency signal resulting from the calculation of (A + B + C + D).
- the track error signal is a low frequency signal of (A + D) _ (B + C).
- the wobble signal is the same operation as the track error signal, but is a high frequency signal.
- the focus error signal is a low frequency signal of (A + C) _ (B + D).
- the raw (RF) signal is desirably calculated by another circuit with a high band, it is not described here, but the calculation is (A + B + C + D).
- the light receiving element is of course
- the shape of the division of (PD) is not limited to this, and may be divided more finely, or conversely, may be as small as a few divisions. That is, the signal calculation should be optimized according to each light receiving mode.
- the track error signal can be obtained by a DPD (Differential Phase Detection) method.
- the track error signal is the case of a three-beam method of receiving and calculating three light beams or a DPP (differential push-pull) method.
- the track cross signal can also be calculated using three beams.
- the focus system may be another light receiving element.
- the wobble signal may be calculated by a circuit different from the track error signal, or various correction circuits may be inserted before the subtraction amplifier.
- the method and means for extracting a signal from the medium 1 as long as the arithmetic method is optimized by the detection method does not depend on the method or means.
- FIG. 3 is a diagram showing a schematic diagram of the two-layer recording medium 1 as a multilayer structure.
- recording is performed by absorbing the energy of the light beam at the absorption rate "A1".
- the reflectance "R1" is different between the mark (recorded area) and the space (unrecorded area)
- the recorded data can be read from the reflected light of the first layer.
- the light beam transmitted at the transmittance “T1” of the first layer recording film reaches the second layer.
- the second layer recording is performed with the energy absorbed at the absorption rate "A2". Since the reflectance of the second layer differs between the mark and the space as in the case of the first layer, it is possible to read the data recorded from the reflected light of the second layer. In detail, the reflected light from the second layer is absorbed and reflected when transmitting through the first layer again, but since the light beam intensity is sufficiently weak at the time of reflection at the second layer, No record will be made when it reaches the first layer the next time. It can be considered that a similar phenomenon occurs in the case of a multilayer. Further, it can be considered that the same phenomenon occurs regardless of whether the type of the recording film is the write-once type (R) or the rewritable type (RW).
- R write-once type
- RW rewritable type
- FIG. 4 is a diagram for explaining the flow of a light beam using the two-layer recording medium 1 as an example.
- FIG. 4A shows a case where the light beam is focused on the first layer recording film.
- the light from the light source to the medium 1 (outgoing path) is indicated by a solid line, and the reflected light from the medium 1 (return path) is indicated by a dotted line.
- FIG. 4 shows only the path of light incident from one end of the objective lens for simplification.
- the light beam is focused by the objective lens toward the media access position (focal point).
- the ray axis of this light beam is indicated by a dashed line.
- the light beam reflected by the first layer returns to the objective lens, and is focused on a light receiving element (PD) through a surrounding optical system (not shown).
- the light beam reflected by the second layer that passes through the central part of the objective lens returns to the objective lens and is focused on the light receiving element.
- the light beam that has passed through the end of the objective lens is reflected light. Is returned to the outside of the objective lens, or diverges in the optical system up to the light receiving element even after returning to the objective lens, and is rarely guided to the light receiving element. That is, it is relatively small that the reflected light from the second layer leaks into the reflected light from the first layer.
- FIG. 4B shows a case where the focus is on the second layer.
- the reflected light from the second layer which is in focus, returns to the objective lens and is focused on the light receiving element.
- the light at the center of the objective lens also returns to the objective lens and is condensed on the light receiving element.
- Fig. 4 (a) most of the light that passed through the end of the objective lens that did not return to the light receiving element returned to the objective lens, and although it diverged in the optical system up to the light receiving element, The guided light is more than in the case of Fig. 4 (a).
- the first layer recording film is shown as recording layer B
- the second layer recording film is shown as recording layer A
- points of the recording layers A and B on the light axis were set as X point and Y point. Note that the size of each point is specifically an area (X area, Y area) based on the light beam diameter in each layer.
- the degree of leakage from another layer changes depending on whether the light beam is focused on the first layer or when the light beam is focused on the second layer. Specifically, when accessing the back layer (second layer) from the entrance surface, the reflected light from the near layer (first layer) often leaks and has an adverse effect. Further, it can be said that the adverse effect is reduced when the amount of reflected light is small in the layer on the near side in a recorded state.
- FIG. 5 illustrates this in terms of signal level.
- the upper layer is the first layer and the lower layer is the second layer.
- the signal levels obtained from the recording film reflected light are shown.
- Fig. 5 (a) shows the case where the first layer (recording layer B) has not been recorded
- Fig. 5 (b) shows the signal level when the first layer (recording layer B) has been recorded. Is shown.
- the bold line in FIG. 5 is a reference (GND) level
- the SIN wave is a signal level using a track cross signal as an example.
- the small dotted line in FIG. 5 indicates the signal level offset due to leakage.
- the reflected light is large, so when the second layer is accessed and the reflected light is received, the reflected light from the first layer is largely leaked. And the signal level increases. Generally, since the leaked light enters the entire light receiving element, the total light amount becomes large. Since the track cross signal is a sum signal, a phenomenon occurs in which the signal level increases.
- the signal level of the second layer greatly depends on the recorded state of the first layer (unrecorded or recorded). As shown in FIG. 5, the signal level of the first layer is almost equal to the signal level of the second layer when the first layer has been recorded.
- the track cross signal has been briefly described as an example.
- the sum signal in the case of a four-segment light-receiving element, Normalization by four additions is used.
- FIG. 6 shows an example of the circuit block.
- the sum signal is averaged by the LPF 21 and passes through the amplifier 22.
- the amplitude or signal level of the output is measured by the amplitude detection circuit 23, and the gain is determined by the gain circuit 24 so that the output voltage or the target voltage (target value) is obtained.
- the amplification amplifier 22 amplifies the signal at this amplification rate.
- the normalized sum signal is maintained at the target voltage.
- Other signals focus error signal, track cross signal, track error signal, double signal, etc.
- Such an amplitude adjustment circuit is called an AGC (auto gain control) circuit (signal correction circuit) 29.
- AGC auto gain control circuit
- the specifications of various signal characteristics are specified.
- the signal inspection (amplitude, etc.) of the second layer (recording layer A) in the present embodiment when the first layer (recording layer B) is already recorded (more generally, the adjacent layer is already recorded). In the case), various signal characteristics are inspected. Note that the various signal characteristics may be set such that the same value is set as the target value in a plurality of recording layers.
- the recording / reproducing operation is actually performed, the leakage of the reflected light from another layer has an adverse effect. Therefore, it is desirable to be able to perform the reproduction and the recording in a state where the P-contact layer is already recorded. Les ,. In the above description, it is desirable that the recording be performed on the medium in such an order that the near layer is accessed while the front layer is already recorded.
- FIG. 7 is a diagram showing waveforms of a track cross signal and a track error signal in relation to track 4 of medium 1.
- the track cross signal is a waveform in which the signal level decreases at the center of the land 3 where information (composed of marks and spaces) is recorded.
- the track error signal has a signal waveform that crosses zero at the center of the gnolev. Specifically, it is difficult to determine the characteristic value because it differs depending on the recording density, but it is difficult to determine the normalized track cross signal> 0.1 "or" 0.22 normalized track error signal 0.8 ". Particularly suitable for the recording density using a blue laser as the light source is that the group width is widened and the track is narrowed. ⁇ Normalized track cross signal> 0 "and” 0.2 ⁇ normalized It seems that the track error signal is about 0.5 ".
- FIG. 8 is a diagram showing an example of a waveform of a cobbled signal.
- Fig. 8 (a) shows a modulation-free monotone.
- FIG. 8 (b) shows a wobble waveform on which FM modulation is superimposed. Modulation is introduced to include information such as addresses.
- Fig. 8 (c) shows PM modulation
- Fig. 8 (d) shows sawtooth modulation
- Fig. 8 (e) shows MSK modulation
- Fig. 8 (f) shows a wobble waveform with ⁇ N-OFF modulation superimposed. .
- a track error signal (also referred to as a push-pull signal) that is not directly defined by the sum signal is specified, but since the track error signal itself is specified by the sum signal, the sum signal is The reflected light makes the error even more unreliable and the default of the wobble signal unreliable. Therefore, similarly to the servo signal, it is necessary to define a characteristic value that does not cause an error due to leakage of reflected light from the multilayer. Specifically, it is preferable that the characteristic value be about 0.05 ”or about 0.3” of the normalized signal.
- FIG. 9 is a diagram showing an example of a waveform of a wobble signal detected from a recorded area.
- a + D and B + C are adder outputs in the servo and wobble detection circuit 13 in the block diagram of FIG. 2, and (A + D) _ (B + C) is a wobble signal.
- the signals of +8 and +8 are in a state where the wobble component is carried in the data signal having a higher signal strength as compared with the wobble signal.
- the data signal that has been superimposed as an in-phase component on both signals is removed, and a cobble signal can be detected.
- the wobble quality is defined by the C / N (carrier to noise) ratio.
- C / N carrier to noise
- the intensity of high-frequency components such as data signals is not so strong, but the amplitude of the wobble signal is much smaller than that of the data signal. , Cannot be ignored. Therefore, it is desirable that the specification of the signal quality of the signal be performed in a state where the P-contact recording layer is already recorded, similarly to the specification of the amplitude.
- circuit characteristics may be designed according to the regulations. However, if possible, I want to record and play back even if there is no recording. Therefore, the amount of reflected light that leaks between an unrecorded and an already-recorded adjacent recording layer is measured in advance, and the difference is corrected according to the recording state of the adjacent recording layer. Conceivable. Note that various signal characteristics were measured when the first layer (recording layer B) was unrecorded. The signal characteristics of the second layer (recording layer A) which are determined under certain conditions and which are determined by the condition that the first layer (recording layer B) is already recorded may be different.
- FIG. 10 and FIG. 11 show circuit configurations of signal detection circuits 31 and 41 for acquiring in advance the level of leakage of reflected light from another layer, correcting the level, and accurately detecting various signals.
- FIG. 10 is a diagram illustrating an example of a signal detection circuit including an AGC circuit
- FIG. 11 is an example of a signal detection circuit in which the configuration of the AGC circuit is simpler than in FIG.
- the portions for various signals indicated by dotted lines can be connected in a plurality in the same configuration as in FIG. 2, and can correspond to various signals (focus error signal, track cross signal, etc.). Since it is the same circuit for explanation, it is omitted.
- the recording state determination circuit 32 determines whether the recording layer adjacent to the target access recording layer is an unrecorded area or a recorded area. This can be inferred by reproducing the media management area in advance and comparing the external information with the current access position. Of course, a result detected by another means may be used as external information. While checking the recording state of the adjacent recording layer in the recording state discriminating circuit 32, the sampling circuit 33 determines the reflected signal level of the sum signal (even at the maximum amplitude) under two conditions of the adjacent recording layer being unrecorded and recorded. (The average value may be used), and the result of that level is stored in the storage circuit 34. At this time, the recording layer being accessed needs to have the same condition of unrecorded or already recorded in both conditions.
- the storage circuit outputs the sum signal level when the stored adjacent recording layer is unrecorded and the sum signal level when the adjacent recording layer is already recorded to the comparison circuit.
- the comparison circuit 35 calculates the difference between the two sum signal levels.
- the output signal of the comparison circuit 35 is turned on and off in accordance with the output of the recording state discrimination circuit 32 to control the signal correction circuit (AGC circuit) 29 via the adder 37. Determines whether to use as a line.
- the control line is set to ⁇ N and used as the control line of the signal correction circuit 29 because the leakage of reflected light is large. In this case, turn off the control line and do not use it.
- the signal correction circuit (dashed-dotted line) 29 in FIG. 10 forms a circuit similar to the AGC circuit that normalizes with the sum signal shown in FIG. The operation of setting the voltage of the sum signal to the target value is performed. By adding (or subtracting) the output of the comparison circuit 35 to the sum signal by the adder 37, the sum signal is leaked from the adjacent recording layer. The offset of the signal level can be removed. The same operation can be performed with a gain instead of an offset.
- the target voltage for canceling the offset of the sum signal may be set.
- the amplifier is configured by the amplification amplifier 2528 so that the amplification factors of various signals are equal to the amplification factors of the sum signal, normalization is performed using the sum signal.
- the signal correction circuit 42 in FIG. 11 corrects the offset or gain of various signals independently of the AGC normalized by the sum signal.
- the output of the comparison circuit 35 is turned on and off by the recording state determination circuit 32 via the switching means 36 in the same manner as described above.
- the offset and gain of various signals are directly corrected by the output of the comparison circuit 35 via the adder 43.
- FIG. 12 is a diagram showing an example of the configuration of an optical disk device (optical information recording / reproducing device) 51.
- the optical disk device 51 can be divided into a pickup 52 equipped with an optical system, a motor drive circuit 53 for moving the pickup 52 and rotating the optical information recording medium (media) 1, and various electric circuits.
- the pickup 52 includes a semiconductor laser 54 as a light beam light source, an optical component for guiding the light beam to each element, an objective lens 55 for condensing the light beam spot on the medium 1, and a spot.
- An actuator 56 for controlling a lens position to follow a desired position, and a light receiving element (PD) 11 for receiving light reflected from the medium 1 are provided.
- the electric circuit includes a laser driving unit that determines a current for causing the semiconductor laser 54 to emit light.
- a laser driving circuit 59 comprising a 57 and a strategy generating section 58 for determining a recording and reproducing light emission waveform. Since the current-to-light output characteristics of the semiconductor laser 54 greatly change with temperature, the laser drive unit 57 generally has an output control function of detecting the output light intensity and stabilizing the output. For detecting the light intensity, a light receiving element built in the semiconductor laser 54 may be used, or a dedicated optical system (not shown) may be constructed. User data transmitted from outside as recording data is converted into recording information by an encoder controlled by a CPU or the like, and then transferred from the encoder to the laser drive circuit 59 and recorded on the medium 1.
- the reflected signal from the medium 1 received by the light receiving element 11 is an I / V circuit 12 , And is transferred to the RF detection circuit 60 and the servo / wobble detection circuit 13.
- This I / V circuit 12 is the position of the first stage circuit, and it is preferable to set appropriate conversion efficiencies (gains) for reproduction and recording.
- the RF detection circuit 60 extracts the information component recorded on the medium 1 and transfers the extracted information component to a decoder. Further, the transferred information component is converted into user data by a decoder.
- the servo system including the signal detection circuits 31, 41, etc. as described above and the servo system of the wobble detection circuit 13 extract the position information of the spot and issue an instruction to the motor drive circuit 53 for causing the spot to follow the desired position.
- Move the pickup 52 actuator 56 The focus movement between the layers is also performed by moving the actuator 56.
- the wobbled signal component engraved on the track 4 is extracted based on the push-pull signal, which is the difference between the outputs of the light-receiving elements 11 divided by the dividing line in the track tangential direction on the medium 1.
- the data is transferred to an address detection circuit, a clock generation circuit, or the like, and is used for managing the absolute position on the media 1, generating a clock synchronized with the rotation of the media, and controlling the rotation of the media.
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04771043.9A EP1657712B1 (en) | 2003-08-22 | 2004-07-29 | Signal detection method, and signal detection circuit |
US11/223,006 US7426173B2 (en) | 2003-08-22 | 2005-09-12 | Method and apparatus for definition of signal for record medium |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-298630 | 2003-08-22 | ||
JP2003298630 | 2003-08-22 | ||
JP2004157352A JP3793770B2 (ja) | 2003-08-22 | 2004-05-27 | 媒体特性規定方法 |
JP2004-157352 | 2004-05-27 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/223,006 Continuation US7426173B2 (en) | 2003-08-22 | 2005-09-12 | Method and apparatus for definition of signal for record medium |
Publications (1)
Publication Number | Publication Date |
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WO2005020216A1 true WO2005020216A1 (ja) | 2005-03-03 |
Family
ID=34220711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/010830 WO2005020216A1 (ja) | 2003-08-22 | 2004-07-29 | 光情報記録媒体、媒体特性規定方法、媒体特性検査方法、信号検出方法、信号検出回路、及び光情報記録再生装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7426173B2 (ja) |
EP (1) | EP1657712B1 (ja) |
JP (1) | JP3793770B2 (ja) |
WO (1) | WO2005020216A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4107290B2 (ja) * | 2004-12-24 | 2008-06-25 | ティアック株式会社 | 光ディスク装置 |
JP4659045B2 (ja) * | 2006-01-13 | 2011-03-30 | パイオニア株式会社 | 情報再生装置及びサーボ調整方法等 |
JP4903081B2 (ja) * | 2007-05-17 | 2012-03-21 | 株式会社日立製作所 | 光ディスク媒体及びトラッキング方法 |
JP2008299961A (ja) * | 2007-05-31 | 2008-12-11 | Toshiba Corp | 光ディスク装置、およびフォーカス位置制御方法 |
JP4888742B2 (ja) * | 2009-02-25 | 2012-02-29 | ソニー株式会社 | 情報処理装置および方法、並びにプログラム |
JP5359991B2 (ja) * | 2010-05-20 | 2013-12-04 | 信越半導体株式会社 | シリコンエピタキシャルウェーハ及びその製造方法 |
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WO2000023990A1 (fr) * | 1998-10-21 | 2000-04-27 | Matsushita Electric Industrial Co., Ltd. | Support d'enregistrement d'information optique, procede et appareil d'enregistrement et de reproduction |
WO2000079525A1 (fr) * | 1999-06-22 | 2000-12-28 | Matsushita Electric Industrial Co., Ltd. | Disque optique, dispositif de disque optique, et procede de reproduction pour disque optique |
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US5726969A (en) * | 1994-12-28 | 1998-03-10 | Matsushita Electric Industrial Co., Ltd. | Optical recording medium having dual information surfaces |
AU6998396A (en) * | 1995-10-13 | 1997-04-30 | Philips Electronics N.V. | Optical registration medium with dual information layer |
US5640382A (en) * | 1995-12-19 | 1997-06-17 | Imation Corp. | Dual layer optical medium having partially reflecting metal alloy layer |
US6160787A (en) * | 1996-01-11 | 2000-12-12 | Wea Manufacturing, Inc. | Multiple layer optical recording medium for use with two different wavelength laser beams |
JPH09282710A (ja) * | 1996-04-15 | 1997-10-31 | Sony Corp | 光ディスクおよび光学的情報記録再生装置 |
KR100242129B1 (ko) * | 1997-06-18 | 2000-02-01 | 윤종용 | 복수 규격을 만족하는 광 디스크 |
WO2000016320A1 (fr) * | 1998-09-10 | 2000-03-23 | Matsushita Electric Industrial Co., Ltd. | Support de donnees optique, procede de fabrication associe, et procede d'enregistrement et de lecture |
JP4085503B2 (ja) | 1999-02-12 | 2008-05-14 | ソニー株式会社 | 多層光ディスク |
DE60026706T2 (de) * | 1999-06-28 | 2006-11-16 | Sony Corp. | Aufzeichnungs- und/oder wiedergabevorrichtung für optische platten und fokussierservosystem |
JP4085530B2 (ja) | 1999-08-05 | 2008-05-14 | ソニー株式会社 | 光学記録媒体、並びに信号記録装置及び信号記録方法 |
CN1327572A (zh) * | 1999-08-18 | 2001-12-19 | 索尼公司 | 音频信号的记录媒体和记录媒体的记录装置及再生装置 |
JP4300642B2 (ja) * | 1999-08-18 | 2009-07-22 | ソニー株式会社 | 記録媒体及び記録媒体の再生装置並びに再生方法 |
JP2002170276A (ja) * | 2000-12-01 | 2002-06-14 | Pioneer Electronic Corp | 光学式多層情報記録媒体 |
US20020126602A1 (en) | 2001-01-11 | 2002-09-12 | Koninklijke Philips Electronics N.V. | Recording on a multilayer record carrier using feed forward power control |
US6952382B2 (en) * | 2001-04-11 | 2005-10-04 | Matsushita Electric Industrial Co., Ltd. | Recording/reproduction apparatus, recording/reproduction method and information recording medium |
JP4306988B2 (ja) | 2001-09-18 | 2009-08-05 | 株式会社リコー | 情報記録媒体 |
CN1278311C (zh) * | 2002-02-08 | 2006-10-04 | 索尼公司 | 光记录介质的初始化方法 |
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2004
- 2004-05-27 JP JP2004157352A patent/JP3793770B2/ja not_active Expired - Fee Related
- 2004-07-29 WO PCT/JP2004/010830 patent/WO2005020216A1/ja active Application Filing
- 2004-07-29 EP EP04771043.9A patent/EP1657712B1/en not_active Expired - Lifetime
-
2005
- 2005-09-12 US US11/223,006 patent/US7426173B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2000023990A1 (fr) * | 1998-10-21 | 2000-04-27 | Matsushita Electric Industrial Co., Ltd. | Support d'enregistrement d'information optique, procede et appareil d'enregistrement et de reproduction |
WO2000079525A1 (fr) * | 1999-06-22 | 2000-12-28 | Matsushita Electric Industrial Co., Ltd. | Disque optique, dispositif de disque optique, et procede de reproduction pour disque optique |
Also Published As
Publication number | Publication date |
---|---|
JP3793770B2 (ja) | 2006-07-05 |
JP2005100596A (ja) | 2005-04-14 |
EP1657712A1 (en) | 2006-05-17 |
EP1657712B1 (en) | 2017-08-30 |
US7426173B2 (en) | 2008-09-16 |
EP1657712A4 (en) | 2009-04-08 |
US20060044994A1 (en) | 2006-03-02 |
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