JP4389755B2 - Optical recording / reproducing device - Google Patents

Description

  The present invention relates to an optical recording / reproducing apparatus, and more particularly to prevention of erroneous recording, detection of erroneous recording, determination of an erroneous recording position, and rewriting after detection of erroneous recording in the optical recording / reproducing apparatus.

  In an optical disk device, which is a typical example of an optical recording / reproducing device, a tracking error signal or a focus error is used to cope with the problem that a signal to be recorded on an optical disk cannot be properly recorded if vibration or impact is applied to the device during recording. When the signal deviated from the predetermined range, the recording was stopped immediately. For example, with regard to the focus error, the recording is stopped when the value of the focus error signal increases by 1/10 or more of the P-P (Peak to Peak) value of the S-shaped curve, and the tracking error is 1 / of the distance to the adjacent track. Recording was stopped when the tracking error signal indicated that the center point of the light spot was separated from the predetermined track by a distance of 8 or more.

  However, the deviation from the predetermined range of the focus error signal or tracking error signal may be caused by the presence of defects on the optical disk, for example, the presence of minute scratches on the recording surface or protective surface of the optical disk, The deviation from the predetermined range of the tracking error signal or the focus error signal does not always cause a large deviation from the predetermined track or a focus servo abnormality. In other words, even if these signals greatly deviate from the predetermined range, they often do not deviate greatly from the center of the track or do not deviate greatly from the focal point. Was.

  Even if random bit errors or short-term burst errors occur due to the failure to write signals correctly on the optical disk for a short period of time due to optical disk defects or the presence of minute foreign objects on the optical disk, By adopting various ECC strategies (error correction strategies), even if an error occurs within a certain range, the recording is interrupted even though the error is corrected and no actual harm occurs.

  As described above, there is a problem that if the recording is frequently stopped even though actual harm does not occur, the recording time becomes long and the recording cannot be performed efficiently.

In particular, such an optical disc that can be recorded only once, such as a CD-R (Compact Disk-Recordable), a DVD-R (Digital Versatile Disc-Recordable), or a DVD + R (Digital Versatile Disc + Recordable), When recording is interrupted due to the presence of minute foreign matter, a large amount of recording area is consumed because rewriting cannot be performed.
JP 2001-266350 A

  Therefore, the present invention provides an optical recording / reproducing apparatus that effectively prevents the occurrence of erroneous recording, does not waste recording time and recording area, and accurately determines whether or not erroneous recording has occurred. It is an object of the present invention to provide an optical recording / reproducing apparatus capable of determining, and further to provide a recording / reproducing apparatus capable of specifying a position on an optical recording / reproducing medium on which rewriting is performed when an error occurs.

According to the first aspect of the present invention, laser light is condensed on a recording surface of an optical recording / reproducing medium, the laser light is disposed along a recording track provided on the optical recording / reproducing medium, and the optical recording / reproducing medium and the optical recording / reproducing medium Servo means for changing a relative positional relationship with laser light, an encoder for converting a recording data signal into a modulated recording signal, and a modulated recording signal storage means for storing the modulated recording signal in time series, the recording a signal modulation and recording means for the intensity of the laser beam based on the modulation recording signal corresponding to the data signal by changing to record optically signals to said recording surface, corresponding to the sum of the laser beam reflected from said recording surface the sum signal, and a matrix amplifier for detecting a space sum signal corresponding to the sum of the laser beam reflected from the recording surface in the recording and non space time during the recording operation, based on said sum signal And extracting circuit for detecting a reproduced clock signal which is synchronized with the raw signal and the reproduced signal, and a signal reproducing and demodulating means and a decoder for demodulating the recording data signal from the reproduced signal, the laser in the optical recording medium From the address signal detection means for detecting an address signal indicating the position of light, and the sum signal and the reproduction clock signal, it is determined that the area of the optical recording / reproducing medium is an unrecorded area, and an unrecorded signal is generated. An optical recording / reproducing apparatus comprising: an unrecorded signal detecting unit; and a system control unit that controls the servo unit, the signal modulation / recording unit, and the signal reproduction / demodulation unit, wherein the system control unit includes: the size of the space sum signal stops recording onto the optical recording medium when an abnormality is detected sum signal falls outside the predetermined range, the modulation recording signal The modulated recording signal stored in the storage means and the reproduction signal are compared for each bit, and it is determined that an erroneous recording has occurred when a recording error of a plurality of bits is detected, and the position of the erroneous recording is determined by the address signal. And the unrecorded signal detection means is a position ahead of the position where the recording of the optical recording / reproducing medium was stopped when it is not determined that the recording to the optical recording / reproducing medium was stopped and the erroneous recording occurred. In the case where it is determined that the erroneous recording has occurred, a section in which the sum signal is at least 11 clocks long from the erroneous recording position of the optical recording / reproducing medium with reference to the reproduced clock signal. When it is continuously within a predetermined level range, it is determined that it is the unrecorded area and the unrecorded signal is generated, and the system control means modulates based on the unrecorded signal The optical recording / reproducing apparatus is configured to control to record the recording signal .

    In the invention of claim 2, the servo means is an out-of-focus signal indicating that a focus error signal according to a separation distance from a point where the laser beam is most focused on the recording surface is out of a predetermined range, And / or a track deviation signal indicating that the laser beam is separated from the predetermined recording track by a predetermined distance or more, and the out-of-focus signal and / or the track deviation signal is detected together with the abnormal sum signal. The optical recording / reproducing apparatus according to claim 1, wherein the recording to the optical recording / reproducing medium is stopped when the recording is performed.

In the invention of claim 3, the modulation recording signal storage means returns to the first storage area again and stores the modulation recording signal repeatedly after the modulation recording signal has been stored in all the storage areas. 2. The optical device according to claim 1 , wherein when the abnormal sum signal is detected, recording on the optical recording / reproducing medium is stopped and storage of the modulated recording signal is stopped when the abnormal sum signal is detected. A recording / reproducing apparatus was used.

According to a fourth aspect of the present invention, the signal reproduction / demodulation means includes reproduction signal storage means having a storage capacity not exceeding one frame for storing the reproduction signal in time series, and the system control means includes the modulation recording After comparing the modulation recording signal stored in the signal storage means and the reproduction signal stored in the reproduction signal storage means for every bit of the reproduction signal storage means and detecting the number of mismatches , The collation position is shifted by 1 bit, the number of repetitive mismatches is detected for all the bits, and it is determined that an erroneous recording has occurred when the recording error of the plurality of bits is detected at the collation position where the number of mismatches is the smallest An optical recording / reproducing apparatus according to claim 1 is provided .

According to a fifth aspect of the present invention, the optical recording / reproducing apparatus according to the first aspect is an additional recording medium that cannot be rewritten .

  According to the optical recording / reproducing apparatus of the first aspect, since the recording on the optical recording / reproducing medium is stopped when the abnormal sum signal is detected, it is possible to prevent erroneous recording due to double writing. If the abnormal sum signal is used, the accuracy of detecting the double writing is high, so that the predetermined range for judging whether or not the recording is erroneous can be set loosely. There is no need to stop recording and waste recording time.

  According to the optical recording / reproducing apparatus of the second aspect, since the out-of-focus signal and / or the out-of-track signal are detected together with the abnormal sum signal, erroneous recording other than erroneous recording by double writing can be detected.

According to the optical recording / reproducing apparatus of the third aspect, since the modulation recording signal storage means having the annular structure is provided, it is accurately detected whether or not erroneous recording has occurred by using the small capacity modulation recording signal storage means. Therefore, the cost of the optical recording / reproducing apparatus can be reduced.

According to the optical recording / reproducing apparatus of claim 4, the erroneous recording can be detected even when the frame sync cannot be detected, and it is not necessary to repeatedly obtain the reproduction signal from the optical disc. Can be detected.

According to the optical recording / reproducing apparatus of claim 5, since it is possible to accurately prevent erroneous recording of double writing using the abnormal sum signal, when the optical recording / reproducing medium is a recordable recording medium that cannot be rewritten, Is not erroneously recorded, but the recording is not stopped and the storage area of the write-once recording medium is not wasted.

  The optical recording / reproducing apparatus according to the present embodiment condenses laser light on the recording surface of the optical recording / reproducing medium, arranges the laser light along a recording track provided on the optical recording / reproducing medium, and Servo means for changing the relative positional relationship between the laser beam and the laser beam, and signal modulation / recording for optically recording the signal on the recording surface by changing the intensity of the laser beam based on the modulated recording signal corresponding to the recording data signal Means, a signal reproduction / demodulation means for detecting a reproduction signal based on a change in the laser light reflected from the recording surface on which the optical signal is recorded, and demodulating a recording data signal, and the laser light in the optical recording / reproducing medium An optical recording / reproducing apparatus comprising: address signal detecting means for detecting an address signal indicating a position; and system control means for controlling servo means, signal modulation / recording means, and signal reproduction / demodulation means, The signal modulation / recording means detects a space sum signal corresponding to the sum of the laser beams reflected from the recording / reproducing medium in a space time during which no modulated recording signal is recorded on the optical recording / reproducing medium, and the magnitude of the space sum signal is a predetermined value. The recording on the optical recording / reproducing medium is stopped when an abnormal sum signal out of the range is detected.

  That is, the laser beam is focused on the recording surface of the optical recording / reproducing medium by the focus mechanism, the laser light is arranged along the recording track by the tracking mechanism, and the relative positional relationship between the optical recording / reproducing medium and the laser light is moved. Since the servo means for changing the positional relationship by the mechanism is provided, a time-series signal can be recorded on the optical recording / reproducing medium.

  In addition, since it comprises signal modulation / recording means, signal reproduction / demodulation means, address signal detection means, and system control means, it writes to a predetermined area of the optical recording / reproducing medium and reads the written signal. Can do.

  In particular, the optical recording / reproducing apparatus according to the present embodiment detects a space sum signal corresponding to the sum of laser beams reflected from the recording / reproducing medium in a space time during which no modulated recording signal is recorded on the optical recording / reproducing medium, and Since the recording on the optical recording / reproducing medium is stopped when an abnormal sum signal having a signal magnitude outside a predetermined range is detected, it is possible to accurately detect erroneous recording of double writing.

  That is, since the emission intensity of the laser beam is kept constant during the space time, the size of the space sum signal is within a predetermined range when writing to an unrecorded area, which is an area where recording has not yet been performed. Inside. On the other hand, when writing to an already recorded area, which is an area where recording has already been performed, the magnitude of the space sum signal is modulated by the already formed pits, and the magnitude of the space sum signal is predetermined. Out of the range, the abnormal sum signal is detected. In such a case, recording on the optical recording / reproducing medium is stopped.

  The servo means may have a servo abnormality detection mechanism for detecting a focus error signal and / or a track error signal. In this case, during the operation of recording the recording data signal on the recording surface, when not only the abnormal sum signal but also the out-of-focus signal and / or the out-of-track signal is detected, recording on the recording surface is stopped. Anyway, it is good. By detecting the abnormal sum signal, it is detected that the light spot is located in the already recorded area, and it is possible to prevent erroneous recording as being double writing, but further, by detecting a defocus signal, Recording can be prevented without the light spot being narrowed. Further, by detecting a track deviation signal, it is possible to prevent erroneous recording caused by deviation from a predetermined track regardless of the recorded area and the unrecorded area.

  Double writing to the recorded area not only prevents the signal currently being written from being written correctly, but also makes it difficult to reproduce the signal already written, and this double writing is reliably prevented. In that respect, the recording / reproducing apparatus according to the present embodiment is superior to the conventional recording / reproducing apparatus that detects the out-of-focus signal and / or the out-of-track signal and stops recording. Note that the out-of-focus signal and the out-of-track signal in this embodiment are detected more gently than in the prior art, so that the recording operation is frequently stopped and the writing time is not wasted.

  The signal modulation / recording means may include modulation recording signal storage means for storing the modulation recording signal in time series. If an abnormal sum signal is detected, the system control means reproduces the signal from the optical recording / reproducing medium, and compares the modulated recording signal stored in the modulated recording signal storage means with the reproduced signal. It is also possible to detect whether or not an erroneous recording has occurred by detecting whether or not they match, and to detect the position of the recording surface where the erroneous recording has occurred by an address signal.

  Thus, the action of the modulation recording signal storage means can more accurately detect whether or not an erroneous recording has actually occurred. If it is determined that an erroneous recording has occurred, the recording surface on which the erroneous recording has occurred is determined. Since the position can be specified by the address signal, it is possible to decide how to perform the processing thereafter, that is, where to rewrite, leave it as it is, and where to write next.

  The modulation recording signal storage means has an annular structure in which modulation recording signals are stored in order from the first storage area, and after reaching the last storage area, return to the first storage area and store new data repeatedly. It may be a thing. Although the capacity of the modulation recording signal storage unit can be reduced by adopting such a configuration, the modulation recording signal having a predetermined capacity until the writing to the modulation recording signal storage unit is stopped is stored. As a result, erroneous recording can be reliably detected.

  Further, the signal reproduction / demodulation means may comprise reproduction signal storage means for storing the reproduction signal in time series, and the modulation recording signal stored in the modulation recording signal storage means in time series and the reproduction signal storage means in time. Comparing the reproduction signals stored in series, it is possible to confirm the place where the erroneous recording has occurred repeatedly by circuit processing without consuming the time to actually read the reproduction signal from the optical recording / reproducing medium. . For example, it is possible to more accurately detect whether or not a recording error has occurred by comparing the modulation recording signal stored in time series with the reproduction signal stored in time series by shifting one bit at a time and repeating the comparison.

  Furthermore, the optical recording / reproducing medium may be not only a rewritable medium but also a write-once recording medium. In particular, in the case of a write-once recording medium that cannot be rewritten, the double-recording erroneous recording is reliably detected. As a result, it is possible to detect the out-of-track signal or the like severely as in the prior art so that recording is frequently interrupted and the recording area is not wasted.

  Another optical recording / reproducing apparatus according to the present embodiment condenses laser light on a recording surface of an optical recording / reproducing medium, arranges the laser light along a recording track provided on the optical recording / reproducing medium, and performs optical recording. Servo means for changing the relative positional relationship between the reproduction medium and the laser beam, and recording the signal substantially continuously along the recording track by changing the intensity of the laser beam based on the modulated recording signal corresponding to the recording data signal Signal modulation / recording means, signal reproduction / demodulation means for detecting a reproduction signal based on a change in laser light reflected from the recording surface on which the optical signal is recorded, and demodulating a recording data signal, and an optical recording / reproducing medium Optical signal recording means comprising: address signal detection means for detecting an address signal indicating the position of the laser beam in the laser; and system control means for controlling servo means, signal modulation / recording means, and signal reproduction / demodulation means. The signal modulation / recording means, which is a live device, includes a modulated recording signal storage means for storing the modulated recording signal in time series, and a laser that reflects from the recording / reproducing medium in a space time during which the modulated recording signal is not recorded on the optical recording / reproducing medium A space sum signal detecting means for detecting a space sum signal corresponding to the total light, and when an abnormal sum signal whose magnitude of the space sum signal is outside a predetermined range is detected, The recording is stopped, and an unrecorded signal indicating that the recording is not performed on the optical recording / reproducing medium is detected based on a change in the laser beam reflected from the recording surface at a position before the recording is stopped, and the unrecorded signal is detected. However, the recording data signal is recorded after a predetermined interval continues.

  That is, an optical recording / reproducing apparatus including a servo unit including a focus mechanism, a tracking mechanism, and an optical recording / reproducing medium moving mechanism, a signal modulation / recording unit, an address signal detecting unit, and a system control unit. Therefore, a desired signal can be recorded at a predetermined position on the optical recording / reproducing medium. In addition, since the signal is recorded substantially continuously along the recording track, the unrecorded area and the recorded area are divided.

  In the present embodiment, the signal modulation / recording means includes a modulation recording signal storage means for storing the modulation recording signal in time series, and a laser reflected from the recording / reproducing medium in a space time during which the modulated recording signal is not recorded on the optical recording / reproducing medium A space sum signal detecting means for detecting a space sum signal corresponding to the total light, so that the signal to be recorded on the optical recording / reproducing medium can be stored, and whether the laser spot is located in the unrecorded area, It is possible to know whether it is located in the recorded area.

  In this embodiment, the recording / reproducing apparatus operates as follows particularly when an abnormal sum signal in which the magnitude of the space sum signal is outside a predetermined range is detected.

  First, when an abnormal sum signal is detected, recording on the optical recording / reproducing medium is stopped, so that double writing can be prevented.

  Further, an unrecorded signal indicating that recording has not been performed on the optical recording / reproducing medium is detected based on a change in laser light reflected from the recording surface at a position prior to the position where recording was stopped. Since the recording data signal is recorded after the interval of (2) is continued, rewriting is not performed until the recorded area is completed, and rewriting is performed after the unrecorded area is detected, so double writing is not performed. Is.

  Next, the optical recording / reproducing apparatus of the present embodiment will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an optical disc apparatus 10 which is a kind of optical recording / reproducing apparatus.

  In the following description, it is assumed that the optical disk 20 that is a kind of optical recording / reproducing medium is a CD-R (Compact Disk-Recordable) that is a kind of write-once optical disk standardized by, for example, ISO / IEC13490-1. Explain. In the CD-R, a guide groove for light beam guide (hereinafter referred to as “pre-groove”) is formed in a spiral shape with the rotation center of the optical disk 20 as the center, and both side surfaces of the pre-groove are slightly sinusoidally in phase. Meandering. The wobble signal WBS indicating the meander component is bi-phase modulated, and is FM-modulated so that the logical numbers “1” and “0” are switched every predetermined period and the average number of “1” and “0” is equal. Information including address information indicating a position on the optical disc 20 is recorded. This information is called ATIP (Absolute Time In Pregroove) information (indicated as ATIP in FIG. 1), and is recorded as absolute time which is one of address information on the disc from the inner circumference side to the outer circumference side of the optical disc 20. Has been.

  Further, the recording surface of the CD-R has a recording film made of an organic dye material, and the data is applied to the data by irradiating a laser beam modulated in accordance with a recording data signal WD to be written on the recording film. Corresponding pit rows are formed irreversibly, and data is additionally written. The pit row is irradiated with laser light so that a change in reflectance according to the pit row occurs.

  The optical disc 20 is rotated at a predetermined speed by a spindle motor 21 which is an optical recording / reproducing medium moving mechanism for changing the relative positional relationship with the laser beam. The spindle motor 21 is supplied with electric power via a spindle motor driver 22 and controls the rotation speed of the optical disc 20 in accordance with a spindle control signal SPDS from the servo control unit 24.

  The optical disc 20 is irradiated with laser light from an OP (Optical Pickup) 30 provided in the optical disc apparatus 10. The OP 30 includes a laser diode (not shown) that emits laser light, a condensing lens and other various optical components (not shown) for condensing the laser light on the recording surface of the optical disc 20, and laser light. A light detection unit (not shown) comprising a focus actuator for moving the focus point (focusing point) and a tracking actuator (not shown) for moving the tracking point, and a light receiving element for detecting the laser beam reflected by the optical disk 20 And an APC (Auto Power Control) circuit (not shown) for keeping the intensity of the laser emitted from the laser diode at a constant value.

  The focus actuator and the tracking actuator move the condenser lens in the focus direction (perpendicular to the recording surface of the optical disc 20) and the tracking direction (a direction along a radial line from the rotation center of the optical disc 20 toward the outer periphery). Power is supplied through the tracking driver 25. Each of the focus actuator and the tracking actuator is controlled by a focus control signal FDS and a tracking control signal TDS from the servo control unit 24.

  The APC circuit provided in OP30 is configured such that the irradiation intensity (including the laser extinction) of the laser light is set by the laser power control signal LDS from the servo control unit 24. Further, at the time of recording, the intensity of the laser light is changed in accordance with the level of “0” or “1” of a modulated recording signal ENCS from an encoder 38 to be described later. No pit row is formed on the optical disc 20, and in the case of “1”, the laser beam intensity is set such that a pit row is formed on the optical disc 20.

  The OP 30 performs tracking in a wider range than the tracking actuator by the sled motor 26, and can irradiate the laser beam over the entire inner surface to the outer periphery of the recording surface of the optical disc 20. The sled motor 26 is supplied with a sled motor control signal SMDS from the servo control unit 24 via a sled motor driver 27 for power supply.

  The light detection unit including the light receiving element includes a four-split photodetector that detects return light from the main spot, a two-split photodetector that detects return light from the preceding side spot, and 2 that detects return light from the trailing side spot. The matrix amplifier 31 adds and subtracts the return light incident on each of the split photodetectors to generate various signals.

  The matrix amplifier 31 is a differential signal from the photodetector divided in the track direction of the quadrant photodetector for detecting the return light of the main spot and a differential signal from the two-segment photodetector for detecting the return light of the preceding side spot. And a differential signal from a two-divided photodetector that detects the return light of the trailing side spot, and obtains a tracking error signal TE containing almost no DC fluctuation by the differential push-pull method. A focus error signal FE is obtained by a stigma method from a difference signal from a photodetector divided in a diagonal direction of a four-divided photodetector that detects wobble and wobbles using return light of a preceding side spot or a trailing side spot The signal SWB is obtained, and the sum signal SUMS is obtained from the sum of the signals of the quadrant photodetector that detects the return light of the main spot. .

  Here, the output level of the sum signal SUMS corresponding to the laser return light from the mark area where the pits are formed on the recording surface of the optical disc 20 is high, and it corresponds to the laser return light from the space area where no pits are formed. Since the output level of the sum signal SUMS is substantially equal to that of the unrecorded area and is low, the EFM signal is detected using the difference in output level.

  In the present embodiment, the matrix amplifier 31 performs a space time (a time during which the intensity of the laser beam is set so that no pits are provided on the optical disc 20) during recording in which the laser beam is modulated in accordance with the modulation recording signal ENCS. ) Includes a detection circuit for a space sum signal SPMS which is a sum signal. This detection circuit samples / holds the sum signal SUMS when the modulation recording signal ENCS is “0”, which will be described later.

  Here, when the modulated recording signal ENCS is “0”, the emission intensity of the laser light from the laser diode is not zero, the pit is not formed on the recording surface, and the emission intensity is such that return light can be detected. Is set. The space sum signal SPMS obtained by sampling / holding the sum signal SUMS is sent to the system control unit 39 and periodically monitored during the writing operation to the optical disc 20, and an abnormality occurs in the space sum signal SPMS. An abnormal sum signal ISKS (see FIG. 2) is generated.

  A method for detecting the abnormal sum signal ISKS will be described below. FIG. 2 illustrates the relationship among the sum signal SUMS, the space sum signal SPMS, and the abnormal sum signal ISKS when the light spot Lsp is subjected to intensity modulation by the modulation recording signal ENCS. For example, a case where an impact is applied to the optical recording / reproducing apparatus 10 during the recording operation and a light spot is irradiated onto the recorded area will be described. At a time T1 before an impact is applied to the optical recording / reproducing apparatus 10, the light spot Lsp moves from the left side of the drawing to the right side along a meandering pregroove (not shown). In this case, since the light spot hardly irradiates the pit row represented by the already formed pit PT, the signal corresponding to the return light reflected by the optical disk 20 is hardly affected by this pit. Only the intensity change of the laser according to the modulation recording signal ENCS is affected. In FIG. 2, one light spot Lsp is shown at each of time T1 and time T2, but in reality, the light spot Lsp continuously moves, and its locus is represented by Tlsp.

  The hold point Hp is a predetermined time point in the space time Tsp, for example, a point delayed by one clock of the reproduction clock signal CKR from the start of the space time Tsp. The space sum is sampled / held for each hold point Hp. Signal SPMS. The space sum signal threshold value THspms is a threshold value for determining whether or not to output the abnormal sum signal ISKS. When the space sum signal SPMS becomes a value equal to or greater than this threshold value, the abnormal sum signal ISKS becomes “1”. Abnormalities are detected. The space sum signal SPMS held in the range of time T1 does not exceed the space sum signal threshold THspms, and the abnormal sum signal ISKS is “0”.

  After time T2, the sum signal SUMS is affected by the intensity change of the laser according to the modulation recording signal ENCS and also by the pit row. The space sum signal SPMS exceeds the space sum signal threshold THspms, and the abnormal sum signal ISKS becomes “1” from the time of the first sample / hold at time T2. The level of the space sum signal SPMS is taken into the servo control unit 24 by an A / D converter (not shown) and then sent from the servo control unit 24 to the system control unit 39. Since the value of the space sum signal threshold THspms is stored in the system control unit 39 in advance, whether the abnormal sum signal ISKS is “1” or “0” is detected by the system control unit 39. Further, since the sample / hold processing for obtaining the space sum signal SPMS requires high-speed processing, it is performed by the matrix amplifier 31 as described above.

  The unrecorded signal detection unit 40 determines whether the area is a recorded area or an unrecorded area based on a change in the laser beam reflected from the recording surface of the optical disc 20. In the CD-R, since the reflectivity of the laser beam is high in the recording area, the signal level of the return light becomes large. Therefore, the direct current component of the sum signal SUMS during the reproduction operation is detected, and within a predetermined level range. If there is, it is determined that it has not been recorded, and an unrecorded signal MKRS is sent to the system control unit 39. Here, when EFM modulation is adopted as the modulation method, even in the recording area, a signal indicating that recording is not performed may be generated for a maximum of 11T. If the reproduction clock signal CKR is input and within a predetermined range of 11T or more and within a predetermined level, it is determined that recording has not been performed and an unrecorded signal MKRS is output to the system control unit 39. The reason why the unrecorded signal MKRS is detected and used without using the playback signal DECS is that the playback signal DECS randomly generates “1” and “0” by the asymmetry correction described later in the unrecorded area. This is because accurate detection cannot be performed.

  The tracking error signal TE and the focus error signal FE are supplied to the servo control unit 24, the wobble signal SWB is input to the ATIP reproducing unit 32 (to be described later), and the sum signal SUMS passes through the extraction circuit unit 33 (to be described later). After being converted to a reproduction signal DECS binarized to “1”, it is inputted to the reproduction signal storage memory 34 and the decoder 35.

  The servo control unit 24 outputs a focus error signal indicating that the focus error signal FE indicating a deviation from the point on the recording surface where the laser beam is most focused is separated by a predetermined distance, and a laser beam from a predetermined recording track currently being tracked. Is provided with a servo abnormality detection circuit (not shown) for detecting an off-track signal indicating that is separated by a predetermined distance or more. Conventionally, for example, a focus error signal is output when a focus error signal value increases by 1/10 or more of a P-P (Peak to Peak) value of an S-shaped curve with respect to a focus error, and a tracking error with an adjacent track is output. When the tracking error signal indicates that the center point of the light spot is separated from the predetermined track by a distance equal to or more than 1/8 of the distance, an out-track signal is output. Only when a larger focus error and a larger tracking error are detected, a focus error signal and a track error signal are output.

  In order to detect such an out-of-focus signal, for example, using the comparator CP1 and the comparator CP2 as shown in FIG. 3B, the threshold values are set to the threshold value THfe + and the threshold value THfe−. For example, as shown in FIG. 3A, the threshold THfe + and the threshold THfe− are P− in a focus search S-curve (a diagram representing the relationship between the magnitude of a focus error signal generated during focus search and time). It is set to 1/2 of the P value.

  For example, a circuit as shown in FIG. 4 is used to detect a track deviation signal. The threshold value THte + is input to the negative terminal of the comparator CP3, and the threshold value THte- is input to the positive terminal of the comparator CP4. This prevents malfunctions caused by noise. Further, when the counter value is set to 2 and a tracking error signal corresponding to a track shift of 1/2 track or more is detected, a track shift signal is detected. Note that by appropriately setting the set value of the counter, any track deviation can be detected for every ¼ track. 4, CK of the counter represents a clock terminal, CLR represents a clear terminal, S of the RS flip-flop represents a set terminal, and R represents a reset terminal. Further, the servo abnormality detection mechanism that determines that a focus error or a track error signal has occurred is not limited to the hardware processing shown in FIGS. 3 and 4, but also when the servo control unit 24 is configured by a DSP (Digital Signal Processor). Is configured by software executed by the DSP.

  Further, instead of the out-of-focus signal and the out-of-track signal, an impact detection signal for detecting that an impact has been applied to the optical disk recording / reproducing apparatus 10 may be used as a signal for stopping the recording operation. An acceleration sensor (not shown) or the like is used as means for detecting an impact.

  In the extraction circuit 33 placed in front of the decoder 35, asymmetry correction of the sum signal SUMS supplied from the matrix amplifier 31 (slice point adjustment in digitization of the sum signal SUMS using the fact that the EFM is a DC free code) and the sum The signal SUMS is binarized and converted to a time-series 1-bit digital signal of “0” or “1” to obtain a reproduction signal DECS, and in synchronization with the obtained reproduction signal DECS The reproduction clock signal CKR is also generated, and the reproduction clock signal CKR is supplied to the decoder 35 together with the reproduction signal DECS.

  The encoder 38 performs the reverse operation of the decoder 35 in signal processing. When recording a signal, the encoder 38 receives a recording data signal WD sent from a host computer or the like to be recorded on the optical disc 20 as a CIRC. Conversion to (Cross Interleave Reed-Solomon Code) is performed, and the signal subjected to this processing is subjected to EFM (Eight to Fourteen Modulation) modulation. In the CIRC conversion process, the recording data signal WD is divided every 8 bits, the 8 bits are regarded as one symbol, an interleave process is performed, and an 8-symbol ECC (Error Correction Code) is generated and added to 24 symbols. In EFM modulation, data of one symbol (8 bits) is converted into a 14-bit signal.

  Further, the encoder 38 further adds a 24-bit frame synchronization signal and a 14-bit subcode signal to the 32 (24 + 8) symbol signal that has been subjected to the EFM modulation process, and 3 bits for DC-free. Thus, a signal of one frame (588 channel bits) is configured. The modulated recording signal ENCS generated in the encoder 38 in this way is either a time-series “0” or “1” signal for each write clock, and the modulated recording signal ENCS is the laser light as described above. Used to modulate the intensity, “0” corresponds to the intensity of the weak laser, and “1” corresponds to the intensity of the strong laser that forms the pit row on the optical disc 20. The modulation recording signal ENCS generated by EFM modulation is an RLL code (Run Length Limited Code), and a variable length NRZ (Non Return) in which the inversion length is variable for each bit from 3 bits (3T) to 11 bits (11T). to Zero) code.

  The decoder 35 extracts a frame synchronization signal, a subcode signal, and a 3-bit signal for DC-free included in the reproduction signal DECS, and demodulates a 14-bit signal not including these signals into an 8-bit signal. After the error correction by the action of ECC, the recording data signal WD written on the optical disc 20 is obtained.

  In the present embodiment, a modulation recording signal storage memory 37 is provided. The modulation recording signal storage memory 37 and the reproduction signal storage memory 34 described above are 1-bit shift registers, and the modulation recording signal ENCS is written to the modulation recording signal storage memory 37 every cycle of the write clock signal. The reproduction signal is written to the reproduction signal storage memory 34 every cycle of the reproduction clock signal CKR. Note that a normal RAM (Random Access Memory) (not shown) is used instead of the 1-bit shift register, and the modulation recording signal ENCS or the reproduction signal DECS is written in chronological order from the LSB (Least Significant Bit) side of the RAM. When the data for the word is written, it may be stored one bit at a time from the LSB of the memory arranged at the next address. The capacity of the modulation recording signal storage memory 37 may be, for example, one frame (588 bits) or one frame (57624 bits) with 98 frames as one sector. Any other number of data, for example, 2000 frames of modulated recording signals may be stored.

  Further, when the capacity of the modulation recording signal storage memory 37 and the reproduction signal storage memory 34 is finite, the storage is continued in order, and after reaching the last storage area, the memory returns to the first storage area again, and the new data If such a memory configuration is adopted, the data stored in the memory immediately before the operation of storing in the memory is stopped can be reproduced in a memory having a finite capacity.

  The system control unit 39 has an interface function between the optical recording / reproducing apparatus 10 and an external circuit, for example, a host computer (not shown), and performs servo control based on a recording or reproducing instruction for the optical recording / reproducing apparatus 10. The control of the unit 24, the transmission control of the recording data signal WD to the encoder 38, the reading control of the recording data signal WD recorded on the optical disk 20 from the decoder 35, the read / write control of the reproduction signal storage memory 34 and the modulation recording The reading / writing control of the signal storage memory 37 is performed.

  Further, the system control unit 39 reads the modulation recording signal ENCS stored in the modulation recording signal storage memory 37 and the reproduction signal DECS from the optical disc 20 or the modulation recording signal ENCS and reproduction signal stored in the modulation recording signal storage memory 37. It has a signal comparison function that outputs a detection signal of whether it matches or does not match by comparing the reproduction signal DECS stored in the storage memory. When the modulation recording signal storage memory 37 and the reproduction signal storage memory 34 are 1-bit shift registers, this signal comparison function matches the digital values of the two memories by a 2-input EXOR (Exclusive OR) circuit. When a RAM is used as the modulation recording signal storage memory 37 and the reproduction signal storage memory 34, a CPU (Central Processing Unit) (not shown) provided in the system control unit 39 may be used. Thus, the contents of each RAM may be compared for each bit.

  Furthermore, the system control unit 39 has an erroneous recording detection function for detecting a coincidence / mismatched detection signal of two digital values and determining an erroneous recording. Ideally, if the erroneous recording is even 1 bit, that is, the modulation recording signal ENCS stored in the modulation recording signal storage memory 37 and the reproduction signal DECS from the optical disk 20 or the modulation recording signal storage memory 37 are stored. If the modulated recording signal ENCS and the reproduction signal DECS stored in the reproduction signal storage memory are compared with each other and there is a difference in even one bit, it is an erroneous recording. However, even if it is a random error or a continuous long burst error, it is possible to correct the error by the action of the ECC. It is desirable in that it does not consume. Therefore, even if a predetermined number of errors in one frame (588 bits), for example, errors up to 2 bits occur, it is not determined to be an erroneous recording, and an error of 3 bits or more is determined to be an erroneous recording. Thus, an erroneous recording detection signal (not shown) is output.

  As described above, the erroneous recording detection method for comparing the modulated recording signal ENCS and the reproduction signal DECS is detected when a method of checking whether the erroneous recording has occurred by checking the final recording data signal WD is used. It is possible to directly detect a 24-bit frame synchronization signal that cannot be performed, an erroneous recording of a 3-bit signal for making DC free, and the like. If there is an erroneous recording in the frame synchronization signal, there is a possibility that a failure occurs in the frame synchronization. If there is an erroneous recording in the 3-bit signal for DC-free, the extraction circuit unit 33 will correct the binary value. The modulation recording according to the present embodiment is more effective than the method of detecting whether or not erroneous recording has occurred by checking the recording data signal WD in that this problem can be avoided in advance. An erroneous recording detection method for comparing the signal ENCS and the reproduction signal DECS is excellent.

  In this embodiment, the OP 30, the matrix amplifier 31, the servo control unit 24, the focus, and the tracking driver 25 function as an example of the focus mechanism and the tracking mechanism, and the system control unit 39, the encoder 38, and the modulation recording signal storage The memory 37 functions as an example of a signal modulation / recording unit, and the system control unit 39, the decoder 35, the extraction circuit unit 33, and the reproduction signal storage memory 34 function as an example of a signal reproduction / demodulation unit, and an ATIP reproduction unit 32 and the system control unit 39 function as an example of an address signal detection unit.

  Next, the operation of the optical disc apparatus 10 will be described. Hereinafter, the initial operation, write operation, read operation, erroneous recording position detection operation, and rewrite operation will be described in this order.

(Initial operation)
When the optical disk device 10 is turned on, the system control unit 39 issues an instruction for initial setting to the servo control unit 24 and arranges the OP 30 at a position where the innermost peripheral portion of the optical disk 20 is irradiated with laser light. Thus, the sled motor 26 is controlled. Then, the spindle motor 21 is rotated at a predetermined number of rotations, and the intensity of the laser beam is set so small that the wobble signal SWB can be read so that pits are not formed on the recording surface. The focus actuator is controlled so that the laser beam is focused on the recording surface of the innermost circumference of the optical disc 20. This focus servo is performed based on the focus error signal FE output from the matrix amplifier 31, and the focus control signal FDS from the servo control unit 24 that has undergone phase compensation and servo system gain setting is applied to the focus and tracking driver 25. Is done.

  After the focus servo is appropriately performed, a tracking error signal TE is generated from the matrix amplifier 31, and tracking control from the servo control unit 24 that performs phase compensation and servo system gain setting on the tracking error signal TE. Tracking servo is performed by applying the signal TDS to the focus / tracking driver 25.

  After the focus servo and tracking servo are appropriately performed, the wobble signal SWB is detected from the matrix amplifier 31, and the ATIP reproducing unit 32 performs a demodulation process on the wobble signal SWB. Specifically, the bi-phase signal is generated and the bi-phase clock signal CKB synchronized with the bi-phase signal is generated, and the ATIP information including the absolute time is decoded from the generated bi-phase signal and the bi-phase clock signal CKB. The bi-phase clock signal CKB is supplied to the servo control unit 24.

  The servo control unit 24 generates the spindle control signal SPDS based on the biphase clock signal CKB and inputs ATIP information to the servo control unit 24. Servo control is performed based on an initial setting command from the system control unit 39. The unit 24 controls the position of the OP 30 using the ATIP information as a clue to read data necessary for predetermined initial setting from the optical disc 20. When the system control unit 39 obtains information necessary for the initial setting, the OP 30 stays at a predetermined position and enters a standby state waiting for the next operation command.

(Write operation)
Next, the operation of the optical disk device 10 when a recording command is issued to record the recording data signal WD from the host computer or the like to the optical disk device 10 via the system control unit 39 will be described.

  The recording command is normally performed by designating a recording start address and the number of recording data and then sending a recording data signal WD to the system control unit 39. The recording start address is often specified by a logical address. Since the relationship between the logical address and the ATIP information is related by the conversion table provided in the system control unit 39, it is possible to arbitrarily select whether to record based on either the logical address or the ATIP information.

  In general, when the recording data signal WD is audio data, it is preferable to use the ATIP information as it is. When the recording data signal WD is digital data from the host computer, the logical address is further set to the optical disk. It is preferable to write in 20 header parts.

  The encoder 38 performs a CIRC conversion process on the recording data signal WD to be recorded on the optical disk 20, and EFM-modulates the signal subjected to the CIRC conversion process before recording it on the optical disk 20. As an example of the format of a signal recorded on the optical disc 20, the first 12 bytes are provided with a synchronization pattern, the next 4 bytes are provided with a header having a logical address indicating a recording position, and the remaining 2336 bytes are data or data. ECC and other areas, and 2352 bytes constitute one sector. For example, one sector of the recorded signal corresponds to one sector of ATIP information.

(Read operation)
Next, an operation when an instruction is issued to read the recording data signal WD recorded on the optical disc 20 from the host computer or the like to the optical disc apparatus 10 via the system control unit 39 will be described.

  The read command is normally performed by designating a read start address and the number of read data. The selection of whether to adopt ATIP information or a logical address as the read start address is arbitrary.

  In the extraction circuit 33, the sum signal SUMS is digitized to generate a reproduction signal DECS. When the reproduction signal DECS is supplied to the decoder 35, the decoder 35 generates a reproduction clock signal CKR synchronized with the reproduction signal DECS, and a time-series EFM-modulated reproduction signal DECS that changes for each reproduction clock signal CKR. 8 is obtained, and further, deinterleave processing (processing for returning the interleaved signal to the original order) and error correction processing based on a predetermined ECC strategy are performed, and a recorded data signal recorded on the optical disc 20 is recorded. WD is reproduced and sent to a host computer or the like.

(Error recording position detection operation)
Next, the erroneous recording position detection operation will be described. Since the erroneous recording position detection can be implemented in various modes in the optical disc apparatus 10 having the above-described configuration, some examples will be described. First, the first embodiment will be described.

(First embodiment)
In the first embodiment, the modulation recording signal ENCS is written to the optical disc 20 with a predetermined capacity, for example, 2000 frames (1176000 bits). At the same time, the modulation recording signal ENCS for 2000 frames is written in the modulation recording signal storage memory 37. A large amount of capacity is written at a time in this manner because, when CIRC is employed, interleaving reaches a maximum of 108 frames. However, when a code with which interleaving is completed within one sector is adopted without adopting CIRC as a coding method while using a short interleaving method, for example, a CD-R medium, for each sector. Since data is recorded efficiently even if data is recorded, the capacity of the modulation recording signal storage memory 37 can be determined accordingly.

  If the abnormal sum signal ISKS is not detected, the recording for 2000 frames is ended. On the other hand, if an abnormal sum signal ISKS is detected during the recording of 2000 frames, the recording is stopped, and then the logical address converted from the ATIP information or the 4-byte logical address written in the additional recording part The head position of the data of one frame written from is found, and the reproduction signal DECS and the modulation recording signal ENCS stored in the modulation recording signal storage memory 37 are compared bit by bit to detect the number of recording errors. To do. If there are more than a predetermined number of bit errors, it is determined that erroneous recording has been performed, and the logical address at the time when the predetermined number of bit errors occurs is detected. The above operation is mainly performed in the system control unit 39.

  In the first embodiment, since the operation of interrupting the recording by detecting the out-of-focus signal or the out-of-track signal as in the prior art is not performed, there is actually no fatal out-of-focus or out of tracking. The recording operation is not interrupted by these signals, and the recording time and recording area are not wasted. When the abnormal sum signal ISKS occurs, the recording operation is stopped to prevent erroneous recording, and the location where the erroneous recording has occurred can be specified. You can decide what to do.

(Second embodiment)
In the second embodiment, when the abnormal sum signal ISKS is generated in the first embodiment, the recording operation is stopped, but in addition to this, when a focus error signal and / or a track error signal is detected. The recording operation is stopped.

  That is, in the second embodiment, the abnormal sum signal ISKS is generated, and the focus error signal FE is equal to or more than 1/2 of the P-P value of the focus search S-curve, thereby generating a defocus signal or tracking error. When the signal TE is separated by 1/2 track or more and a track deviation signal is generated, recording on the optical disc 20 is stopped and writing of the modulation recording signal ENCS to the modulation recording signal storage memory 37 is stopped. Then, it is possible to know the logical address of the sector in which the writing has been stopped from the logical address converted from the ATIP information or the 4-byte logical address written in the additional write part.

  The position on the recording surface where the erroneous recording has occurred is roughly the ATIP information, the logical address converted from the ATIP information, or the logical address of the sector in which writing has been interrupted from the 4-byte logical address written in the additional recording part. By knowing, it can be detected in units of frames or sectors, but the 2000 frames of the modulation recording signal ENCS stored in the modulation recording signal storage memory 37 and the reproduction signal reproduced from the optical disc 20 By detecting the bit-by-bit coincidence with the DECS, it is possible to accurately detect the bit at which erroneous recording has occurred from the frame synchronization signal. The system controller 39 detects the erroneous recording position described above.

  In the second embodiment, not only when the abnormal sum signal ISKS is generated, but the focus out-of-focus signal and the track out-of-track signal are monitored. Even if a minute scratch on the optical disc 20 or a foreign object on the optical disc 20 that does not cause any harm to the recording operation exists, the recording is continued. In fact, no fatal focus deviation or tracking deviation occurs. The recording operation is not interrupted by these signals, and the recording area is not consumed unnecessarily. On the other hand, when a fatal focus error or tracking error occurs and erroneous recording occurs, it can be detected by comparing the reproduction signal DECS with the modulation recording signal ENCS stored in the modulation recording signal storage memory 37. In addition, since the location where the erroneous recording has occurred can be specified, the user who uses the optical disc apparatus 10 can determine how to perform the processing thereafter.

(Third embodiment)
In the third embodiment, the modulation recording signal ENCS is written on the optical disc 20 with a predetermined capacity, for example, 2000 frames of data. At the same time, the modulation recording signal ENCS for one frame is written in the modulation recording signal storage memory 37. At this time, the modulation recording signal ENCS has 2000 frames, whereas the modulation recording signal storage memory 37 has a capacity of only one frame, so that the overwrite is sequentially performed.

  When the abnormal sum signal ISKS, the out-of-focus signal, or the out-of-track signal is generated, recording on the optical disc 20 is stopped and writing of the modulation recording signal ENCS to the modulation recording signal storage memory 37 is stopped. Then, on the recording surface where erroneous recording has occurred by detecting a bit-by-bit match between the modulation recording signal ENCS for one frame stored in the modulation recording signal storage memory 37 and the reproduction signal DECS reproduced from the optical disc 20. Detect position.

  The position on the recording surface where the erroneous recording has occurred can be detected as in the case where 2000 frames are prepared in the modulation recording signal storage memory 37 described above. That is, not only can the coarse position be known from the ATIP information, the logical address converted from the ATIP information, or the 4-byte logical address written in the additional recording portion, but it is stored in the modulation recording signal storage memory 37. By detecting the coincidence of each bit of the modulation recording signal ENCS for one frame and the reproduction signal DECS reproduced from the optical disc 20, it is possible to accurately detect what bit the erroneous recording has occurred from the frame synchronization signal. . The system controller 39 detects the erroneous recording position described above. In the third embodiment, the location where the erroneous recording has occurred can be specified even if the small-capacity modulation recording signal storing memory 37 is used. It is possible to determine whether to perform processing.

(Fourth embodiment)
In the fourth embodiment, the optical disc apparatus 10 includes a reproduction signal storage memory 34. In order to collate the modulation recording signal ENCS stored in the modulation recording signal storage memory 37 and the reproduction signal DECS reproduced from the optical disk 20 bit by bit, the positions of the two digital signals to be collated are exactly the same. Must be. Since the 24-bit frame sync is a unique pattern outside the EFM rules, frame synchronization is generally performed using this frame sync as a clue, but after obtaining the playback signal ENCS from the optical disc 20, the frame sync is extracted. It may take a long time, and it may be necessary to repeat verification several times in order to achieve accurate frame synchronization. In addition, there are cases where it is desired to check the reproduction signal DECS and the modulated recording signal ENCS many times for the sake of accuracy.

  Further, when the storage capacity of the reproduction signal storage memory 34 is set to 1 frame or less, a frame sync may not be detected. In such a case, after detecting the number of mismatches between the modulation recording signal ENCS stored in the modulation recording signal storage memory 37 and the reproduction signal DECS stored in the reproduction signal storage memory 34 for all bits, The comparison position is shifted by 1 bit, and the number of mismatches is repeatedly detected for all bits, and is stored in the modulation recording signal storage memory 37 in the modulation recording signal storage memory 37 and the reproduction signal storage memory 34 within a predetermined range. By shifting the relative position with respect to the reproduced signal DECS, it is possible to specify the occurrence point of the predetermined mismatch at the collation position where the number of mismatches is minimized as the place where the erroneous recording has occurred. If such a collation method is employed, it is not necessary to repeatedly obtain the reproduction signal DECS from the optical disc 20, so that a position where an erroneous recording has occurred can be detected at high speed.

(Other examples)
Any two or more of the first to fourth embodiments described above can be implemented in combination, and the present embodiment is not limited to the above-described embodiments.

(Rewrite operation)
When an erroneous recording occurs, the user who uses the optical disk device 10 may leave it as it is, or may decide to rewrite, and the operation when rewriting will be described.

  The optical disk 20 has a spiral track, and a signal corresponding to the modulation recording signal ENCS is written along the track substantially continuously. In general, re-recording is performed according to the occurrence of erroneous recording. In this case, if writing is again made in an area where recording has already been performed, erroneous recording will occur again, and this must be avoided.

  As shown in FIG. 5A, when the reproduction signal DECS is “0” although the modulation recording signal ENCS recorded in the modulation recording signal storage memory is “1”, the original recording is performed. It is thought that no record was made in the area to be recorded. The location where “1” and “0” did not match exactly is the position where erroneous recording occurred, and can be specified in units of bits (channel bits) as described above. The reproduction signal DECS is “1” in the pit formation region, and “0” is in the space region. Rewriting is performed in an unrecorded area before the recording stop point. In this case, it is necessary to confirm that the area is an unrecorded area and perform rewriting.

  In order to detect an unrecorded area, a digital sum signal DSUMS obtained by slicing a sum signal SUMS at a predetermined level during a reproduction operation is detected, and a digital sum signal DSUMS having a length of at least 11 clocks with reference to the reproduction clock signal CKR. Is “0”, the unrecorded signal MKRS is set to “1”. Here, when the unrecorded signal MKRS is “1”, it represents an unrecorded area.

  On the other hand, as shown in FIG. 5B, when the modulation recording signal ENCS recorded in the modulation recording signal storage memory matches the reproduction signal DECS, it is considered that no erroneous recording has occurred. In some cases, double writing is used. Similarly, in this case, in order to detect an unrecorded area, a digital sum signal DSUMS obtained by slicing the sum signal SUMS at a predetermined level during the reproduction operation is detected, and a length of at least 11 clocks with reference to the reproduction clock signal CKR. When the digital sum signal DSUMS is “0”, the unrecorded signal MKRS is set to “1”.

  The optical recording / reproducing apparatus of the present invention mainly condenses laser light on the recording surface of an optical recording / reproducing medium, arranges the laser light along a recording track provided on the optical recording / reproducing medium, Servo means for changing the relative positional relationship with the laser light, and signal modulation / recording means for optically recording the signal on the recording surface by changing the intensity of the laser light based on the modulated recording signal corresponding to the recording data signal And a signal reproduction / demodulation means for detecting a reproduction signal based on a change in laser light reflected from the recording surface on which the optical signal is recorded and demodulating a recording data signal, and a position of the laser light in the optical recording / reproduction medium An optical recording / reproducing apparatus comprising: address signal detection means for detecting an address signal indicating; and system control means for controlling servo means, signal modulation / recording means, and signal reproduction / demodulation means, The signal modulation / recording means detects a space sum signal corresponding to the sum of laser beams reflected from the recording / reproducing medium in a space time during which no modulated recording signal is recorded on the optical recording / reproducing medium, and the size of the space sum signal is a predetermined value. The recording on the optical recording / reproducing medium is stopped when an abnormal sum signal out of the range is detected. The optical recording / reproducing medium is spirally formed on the disc-shaped optical disk shown in the present embodiment. However, the material constituting the recording surface of the optical recording / reproducing medium is not limited to the organic dye material, and may be, for example, a shape in which a linear track is disposed on a rectangular plate-like body. The servo means condenses the laser beam and arranges the laser beam along the recording track to change the relative positional relationship between the optical recording / reproducing medium and the laser beam. What If there is, the present invention is not limited to that shown in this embodiment, and any of the signal modulation / recording means, address signal detecting means, system control means, modulation recording signal storage means, signal comparison function, and erroneous recording determination means The present invention is not limited to the embodiment, and the modulation method, ECC method, recording data format, etc. are not limited in any way, the specific configuration of the space sum signal detection method and detection means, and the detection of the abnormal sum signal Neither the method nor the specific configuration of the detection means is limited to the present embodiment.

  Another optical recording / reproducing apparatus according to the present invention condenses laser light on a recording surface of an optical recording / reproducing medium, and arranges the laser light along a recording track provided on the optical recording / reproducing medium, thereby optical recording / reproducing. Servo means for changing the relative positional relationship between the medium and the laser beam, and the signal is recorded substantially continuously along the recording track by changing the intensity of the laser beam based on the modulated recording signal corresponding to the recording data signal. Signal modulation / recording means, signal reproduction / demodulation means for detecting a reproduction signal based on a change in laser light reflected from a recording surface on which an optical signal is recorded, and demodulating a recording data signal, and an optical recording / reproducing medium Optical recording / reproducing comprising: address signal detecting means for detecting an address signal indicating the position of the laser beam; and system control means for controlling servo means, signal modulation / recording means, and signal reproduction / demodulation means The signal modulation / recording means includes a modulated recording signal storage means for storing the modulated recording signal in time series, and a laser beam reflected from the recording / reproducing medium in a space time during which the modulated recording signal is not recorded on the optical recording / reproducing medium. Space sum signal detecting means for detecting a space sum signal corresponding to the sum of the two, and when an abnormal sum signal whose magnitude of the space sum signal is outside a predetermined range is detected, recording on the optical recording / reproducing medium is performed. The unrecorded signal indicating that the recording is not performed on the optical recording / reproducing medium is detected based on the change in the laser beam reflected from the recording surface at a position before the position where the recording is stopped. The recording data signal is recorded after a predetermined interval, but the optical recording / reproducing medium has a spiral track arranged on the disk-shaped optical disk shown in the present embodiment. For example, it may have a shape in which a linear track is arranged on a rectangular plate-like body, and the material constituting the recording surface of the optical recording / reproducing medium is not limited to an organic dye material, but a phase change The servo means may condense the laser beam, place the laser beam along the recording track, and change the relative positional relationship between the optical recording / reproducing medium and the laser beam. For example, signal modulation / recording means, address signal detection means, system control means, modulation recording signal storage means, signal comparison function, and erroneous recording determination means are not limited to those shown in this embodiment. However, the modulation method, the ECC method, the format of the recording data, etc. are not limited in any way, the space sum signal detection method and the specific configuration of the detection means, and the abnormal sum signal detection method And Any of the specific structure of the detection means is not limited to this embodiment. Further, the unrecorded signal is not limited to the signal detected with the sum signal as a reference.

It is a block diagram of the optical recording / reproducing apparatus of this Embodiment. It is a figure which shows the detection method of an abnormal sum signal. It is a figure which shows the detection method of an out-of-focus signal. It is a figure which shows the detection method of a track | truck deviation signal. It is a figure which shows the detection method of an unrecorded signal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical recording / reproducing apparatus 20 Optical disk 21 Spindle motor 24 Servo control part 26 Thread motor 30 OP (optical pick-up)
31 Matrix Amplifier 32 ATIP Reproduction Unit 33 Extraction Circuit Unit 34 Reproduction Signal Storage Memory 35 Decoder 37 Modulation Record Signal Storage Memory 38 Encoder 39 System Control Unit 40 Unrecorded Signal Detection Unit

Claims (5)

Laser light is condensed on the recording surface of the optical recording / reproducing medium, the laser light is disposed along a recording track provided on the optical recording / reproducing medium, and the relative relationship between the optical recording / reproducing medium and the laser light is set. Servo means for changing the positional relationship;
An encoder for converting a recording data signal into a modulation recording signal; and a modulation recording signal storage means for storing the modulation recording signal in time series, and the intensity of the laser beam is determined based on the modulation recording signal according to the recording data signal. A signal modulation / recording means for optically recording a signal on the recording surface by changing,
The sum signal corresponding to the sum of the laser beam reflected from the recording surface, and a matrix amplifier for detecting a space sum signal corresponding to the sum of the laser beam reflected from the recording surface in the recording and non space time during the recording operation,
A signal reproduction / demodulation means comprising: an extraction circuit section for detecting a reproduction signal and a reproduction clock signal synchronized with the reproduction signal based on the sum signal; and a decoder for demodulating the recording data signal from the reproduction signal ;
Address signal detection means for detecting an address signal indicating the position of the laser beam in the optical recording / reproducing medium;
Unrecorded signal detection means for generating an unrecorded signal by determining that the area of the optical recording / reproducing medium is an unrecorded area from the sum signal and the reproduced clock signal;
A system control unit for controlling the servo unit, the signal modulation / recording unit, and the signal reproduction / demodulation unit,
The system control means stops recording on the optical recording / reproducing medium when detecting an abnormal sum signal in which the magnitude of the space sum signal is outside a predetermined range, and is stored in the modulation recording signal storage means and stored in the modulation recording signal storage means. Comparing the modulated recording signal and the reproduction signal bit by bit, determining that an erroneous recording has occurred when detecting a recording error of a plurality of bits, specifying the position of the erroneous recording by the address signal,
The unrecorded signal detecting means stops the recording on the optical recording / reproducing medium, and if it is not determined that the erroneous recording has occurred, When it is determined that an erroneous recording has occurred, the sum signal is continuously at least 11 clocks long with respect to the reproduced clock signal at a position ahead of the erroneous recording position of the optical recording / reproducing medium. When it is within a predetermined level range, it is determined that it is the unrecorded area, and the unrecorded signal is generated, and the system control means controls to record the modulated record signal based on the unrecorded signal An optical recording / reproducing apparatus configured. The servo means includes an out-of-focus signal indicating that a focus error signal corresponding to a separation distance from a point on the recording surface where the laser beam is most focused is out of a predetermined range, and / or predetermined recording. Detecting a track deviation signal indicating that the laser beam is separated from the track by a predetermined distance or more,
2. The optical recording / reproducing apparatus according to claim 1, wherein recording on the optical recording / reproducing medium is stopped when the out-of-focus signal and / or the out-of-track signal are detected together with the abnormal sum signal. The modulated recording signal storage means, after all of the modulated recording signal in the storage area reaches the stored has an annular structure that is first of the modulated recording signal back to the storage area is repeated again stored ,
The optical recording / reproducing apparatus according to claim 1, wherein when the abnormal sum signal is detected, recording on the optical recording / reproducing medium is stopped and storage of the modulated recording signal is stopped.   The signal reproduction / demodulation means includes reproduction signal storage means having a storage capacity not exceeding one frame for storing the reproduction signal in time series,
  The system control means compares the modulation recording signal stored in the modulation recording signal storage means and the reproduction signal stored in the reproduction signal storage means for every bit of the reproduction signal storage means bit by bit. When the number of mismatches is detected, the collation position is shifted by 1 bit, the number of mismatches is repeatedly detected for all bits, and the recording error of the plurality of bits is detected at the collation position where the number of mismatches is the smallest. The optical recording / reproducing apparatus according to claim 1, wherein it is determined that an erroneous recording has occurred.   The optical recording / reproducing apparatus according to claim 1, wherein the optical recording / reproducing medium is a write-once recording medium that cannot be rewritten.

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