JP2008130162A - Optical disk recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk recording and reproducing device capable of improving measurement accuracy of recording sensitivity to an optical disk having a tracking guide groove and adjusting recording power during recording. <P>SOLUTION: A spindle motor 7 is operated at a prescribed number of revolutions when an output level of reproduction power of LD 3 is controlled by a laser control part 10. A pickup 2 is moved from a prescribed movement start position to detect a tracking error (TE) signal during the movement and to measure an RF signal except when crossing a part between a land and a groove of the optical disk 1. Thus, the sensitivity of the optical disk is measured. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disk recording apparatus that records and reproduces optical information on a recordable information recording medium.

  An apparatus for recording / reproducing information, particularly digital information, on an information recording medium is attracting attention as means for recording / reproducing a large amount of data. Among them, there is an optical information recording medium capable of recording data using laser light. The optical information recording medium includes a write-once optical disc that can be recorded only once and a rewritable phase change optical disc that can be rewritten. In either case, recording on an optical disk is performed by irradiating a rotating optical disk with a light beam of a semiconductor laser and heating and melting a recording film on the disk. At this time, the temperature reached and the cooling process of the recording film differ depending on the intensity of the light beam, and the recording film changes. Reproduction of recorded data is performed by irradiating a low-intensity light beam for reproduction to such an extent that the recording film does not change. Data can be read.

  In the optical disk recording method described above, when mark edge recording is performed using data as marks on the optical disk, optimum recording is performed by adjusting the recording power in order to record a predetermined mark.

  By the way, an optical disk, which is a medium for recording, has a difference in film and material formed on the disk.

  A write-once optical disc has a guide groove for tracking, a recording layer, a reflective layer, a protective layer, and the like formed on a substrate, and the recording layer is formed of an organic dye system. On the other hand, a rewritable optical disc has a tracking guide groove, a dielectric layer, a recording layer, a reflective layer, an overcoat layer, and the like formed on a substrate, and the recording layer is formed of a layer-changing film. Here, if these layers are all uniform on the optical disk and have the same characteristics, recording may be performed under the same recording conditions over the entire area of the optical disk.

  However, in the process of producing a film by vapor deposition or sputtering in the manufacturing method of an optical disk, the formation of the film tends to be nonuniform on the innermost and outermost circumferences of the optical disk, and in the process of applying by spin coating Since the coating is performed using the centrifugal force generated when the optical disk is rotated, the layer formation may vary particularly in the radial direction of the optical disk.

  When recording on such an optical disc, even if recording is performed with the same recording power, depending on the formation of the layer at the recording position, the recording conditions may differ, and a required mark may not be formed.

With respect to the above problems, in Patent Document 1, a laser power threshold value is provided in order to prevent a phase change in the recording medium film, and laser light irradiation is performed with a laser power lower than the threshold value. The recording sensitivity information data is obtained from the measurement result of the reflected light, and the output control of the laser light source appropriately corresponding to each recording portion is performed based on the recording sensitivity information data. As a result, even when recording is performed on a write-once optical disc whose recording sensitivity is non-uniform depending on the radial direction position, uniform electrical characteristics can be obtained over the entire surface of the disc by performing optimal recording laser output control. be able to.
Japanese Patent Laid-Open No. 7-29181

  As a physical structure of a recordable optical disc in recent years, a tracking guide groove is formed on the optical disc, a groove recording method for recording in the groove as the guide groove, a groove as the guide groove, and a guide There is a land / groove recording method in which recording is performed on both lands other than grooves. When acquiring the reflected light by moving the pickup in the radial direction of the optical disk, there is a problem that the reflected light is disturbed when crossing between the groove and the land, and accurate measurement becomes difficult. Since the method of Patent Document 1 does not consider the case where the reflected light crosses between the groove and the region other than the groove as described above, the groove recording or the land / groove on the optical disk having the tracking guide groove exists. For recording, it is impossible to control the output of the recording laser appropriately.

  In addition, the land and the groove are other than the groove due to the structure, and the height of the land and the groove is different, so that there is a difference in the formation of the layer, and the level of the reflected light may be different. . If exactly the same reflected light can be obtained between the land and the groove, the movement in the radial direction in Patent Document 1 may be performed, but in reality, a difference occurs in the reflected light level of each area of the land and the groove. This may cause measurement errors.

  In Patent Document 1, since the movement in the radial direction is performed, the positional relationship between the physical address of the recording part for performing laser output control and the position where the reflected light of the optical disk is measured is grasped. I can't. In recent years, due to the increase in capacity of optical disk devices, it is necessary to perform measurement while maintaining the positional relationship between the physical address of the recording site and the position on the optical disk, but the positional relationship cannot be clearly grasped. In the method of Patent Document 1, output control of the laser light source corresponding to the recording part cannot be performed at the time of recording.

  In Patent Document 1, the reflected light of a complete unrecorded optical disk is measured and then recorded. When additional recording is performed on a partially recorded optical disk, the reflected light level is recorded in the recorded area. Changes, resulting in a measurement error.

  The present invention has been made to solve the above-described conventional problems, and improves the measurement accuracy of recording sensitivity, and optical disk recording capable of adjusting recording power so that a predetermined mark is formed when recording is performed. An object is to provide an apparatus.

  In order to solve this problem, an optical disk recording apparatus according to claim 1 of the present invention is based on a groove recording method in which recording is performed on a groove area of an optical disk having a tracking guide groove, or the groove area and the tracking guide. In an optical disk recording apparatus that forms a recording mark by a land / groove recording system that records on both land areas other than grooves, a pickup having a laser light source that emits laser light is moved at a predetermined moving speed in the optical disk. A feed mechanism that moves from the outer circumference to the outer circumference, or from the outer circumference to the inner circumference; and a reproduction laser control section that controls the output power of the laser light source to be the reproduction power necessary for data reproduction of the optical disc; The output power of the laser light source is controlled to be a predetermined recording power A recording laser control unit, an FE detection unit that detects a focus error (FE) signal from a reflected wave of the optical disc, a focus control unit that performs focus servo control based on the TE signal, and a reflected wave of the optical disc. A TE detection unit that detects a tracking error (TE) signal, a rotation control unit that rotates the optical disc at a predetermined number of revolutions, and an output from the optical disc when the optical disc is irradiated with output light from the laser light source. A reflected wave level measuring unit for measuring a level of a total addition signal of reflected waves, and for removing disturbance of the reflected waves when the pickup crosses between a land area and a groove area of the optical disc. A TE signal threshold level is provided, and the TE signal detected by the TE detector during playback of the optical disc is The recording sensitivity is measured from the level of the total addition signal of the reflected wave when the value is below the threshold value level, and the recording power at the time of actual recording is changed according to the measurement result of the recording sensitivity. Features.

  As a result, in the optical disk having the tracking guide groove, the disturbance of the reflected light generated when the pickup crosses between the land area and the groove area can be eliminated, and the recording sensitivity can be measured stably. By changing the output level of the recording power according to the recording sensitivity, the recording mark can be stably formed over the entire surface of the optical disc, the error of the recording mark to be formed can be reduced, and recording can be performed during recording. Power control can be performed appropriately.

  An optical disk recording apparatus according to a second aspect of the present invention is the optical disk recording apparatus according to the first aspect, wherein the recording sensitivity is measured by determining whether a laser beam irradiation position is a land area or a groove area. It is performed in.

  Thereby, since the recording sensitivity can be measured while discriminating the type of the guide groove, it is possible to prevent the occurrence of a measurement error and improve the measurement accuracy.

  An optical disk recording apparatus according to a third aspect of the present invention is the optical disk recording apparatus according to the first or second aspect, further comprising an address detection unit that acquires a physical address of the optical disk, The movement speed of the pickup is set so that the optical disk rotates a predetermined number of times while the pickup moves a predetermined distance in the radial direction from the movement start position. And adjusting the number of rotations of the optical disc and measuring the recording sensitivity.

  As a result, the rotational speed of the optical disc and the moving speed of the pickup can be controlled in conjunction with each other, so that the recording sensitivity can be increased at high speed while grasping the positional relationship between the position of the pickup on the optical disc and the physical address of the recording site. It is possible to measure, and at the time of recording, the recording power corresponding to the recording part can be controlled.

  An optical disk recording apparatus according to a fourth aspect of the present invention is the optical disk recording apparatus according to any one of the first to third aspects, further comprising an address detection unit that acquires a physical address of the optical disk. The physical address position in the radial direction in which the position formed by the straight line connecting the center of the optical disk and the movement start position is a predetermined angle, where the position of an arbitrary physical address on the optical disk is the movement start position of the pickup, It is a measurement position of the recording sensitivity.

  Thereby, since the recording sensitivity is measured only in an arbitrary radial direction from the center position of the optical disc, the recording sensitivity measurement time can be shortened.

  An optical disk recording apparatus according to claim 5 of the present invention is the optical disk recording apparatus according to any one of claims 1 to 4, further comprising an address detection unit that acquires a physical address of the optical disk. The optical disk is a recording medium that is divided into a plurality of zones and records at different recording speeds for each zone. Based on the address information from the address detection unit, the physical address of each zone area of the optical disk is determined. Grasping, measuring the recording sensitivity for each zone, and changing the output level of the recording power based on the result of averaging the recording sensitivity for each zone. To do.

  Thereby, since the recording sensitivity is measured in units of zones of the optical disc, the measurement time can be shortened, and the positional relationship between the position of the pickup and the zone area at the time of recording can be grasped. The recording power corresponding to the zone area to be recorded can be controlled.

  An optical disk recording apparatus according to a sixth aspect of the present invention is the optical disk recording apparatus according to any one of the first to fifth aspects, wherein the optical disk is a recording medium in which marks and spaces are mixed. A holding unit that holds a level of the total addition signal of the reflected wave when the irradiation position of the laser beam is a space of the optical disc during data reproduction of the optical disc, and the measurement of the recording sensitivity is performed by the hold It is based on the level hold | maintained by the part, It is characterized by the above-mentioned.

  Thereby, the measurement accuracy of the recording sensitivity for the partially recorded optical disk can be increased.

  According to the optical disk recording apparatus of the present invention, recording is performed by a groove recording method for recording in a groove area of an optical disk having a tracking guide groove, or in both the groove area and a land area other than the tracking guide groove. In an optical disk recording apparatus that forms a recording mark by a land / groove recording method, a pickup having a laser light source that emits laser light is moved at a predetermined moving speed from the inner periphery to the outer periphery or from the outer periphery to the inner periphery. A feed mechanism unit that is moved to a position, a reproduction laser control unit that controls the output power of the laser light source to be a reproduction power necessary for data reproduction of the optical disc, and an output power of the laser light source. A recording laser control unit that controls the recording power to be An FE detection unit for detecting a focus error (FE) signal from the reflected wave of the disk, a focus control unit for performing focus servo control based on the TE signal, and a tracking error (TE) signal from the reflected wave of the optical disc. TE detection unit to detect, rotation control unit for rotating the optical disc at a predetermined number of revolutions, and the level of the total addition signal of the reflected wave from the optical disc when the optical disc is irradiated with output light from the laser light source And a reflected wave level measuring unit for measuring the TE signal threshold level for removing disturbance of the reflected wave when the pickup crosses between the land area and the groove area of the optical disc. And the reflected wave when the TE signal detected by the TE detection unit is below the threshold level during reproduction of the optical disc. Since the recording sensitivity is measured from the level of the total addition signal, and the recording power at the time of actual recording is changed according to the measurement result of the recording sensitivity, the pickup is performed on the optical disc having the tracking guide groove. By eliminating the disturbance of reflected light that occurs when crossing between the land area and the groove area, the recording sensitivity can be measured stably, and the output level of the recording power can be changed according to the measured recording sensitivity. Therefore, it is possible to stably form recording marks over the entire surface of the optical disc, reduce errors in the formed recording marks, and appropriately control the recording power during recording.

(Embodiment 1)
FIG. 1 is a system block diagram showing the main configuration of an optical disk recording apparatus according to Embodiment 1 of the present invention.
The optical disk recording apparatus according to the first embodiment shown in FIG. 1 includes a pickup 2, a slide feed mechanism unit 6, a spindle motor 7, a focus control unit 8, a feed mechanism control unit 9, a laser control unit 10, a rotation control unit 11, and a focus. An error (FE) detection unit 12, a tracking error (TE) detection unit 13, an RF amplifier 14, and a system control unit 17 are provided, and when recording marks are formed on the optical disc 1, different recording powers are set depending on the sensitivity of the media. Change and record.

  The optical disc 1 is a recordable optical disc. In addition, as a recordable optical disk, a recording mark is generated by deforming a recording layer according to the intensity of a laser beam, an optical recording film is formed of a pigmented film such as cyanine, or a laser beam intensity. In some cases, a phase change occurs reversibly between a crystalline layer and an amorphous layer, and a recording mark is generated using a difference in reflected light, and an optical recording film is formed of a phase change film. In addition, a guide groove for tracking is formed in advance on a recordable optical disk. As a recording method, a groove recording method for recording in a groove area of the guide groove, and a land other than the groove area of the guide groove and the guide groove are used. There is a land / groove recording method for recording in an area. In any recording method, a wobble is formed in the tracking guide groove of the optical disc and includes address information.

  The pickup 2 emits a laser to the optical disc 1 to write and read information on the optical disc 1. The pickup 2 includes a laser diode (LD) 3 that emits laser light, a lens 19a for focusing on the recording surface of the optical disc 1, an actuator 4 that drives the lens 19a up and down to focus, and the optical disc 1. And a polarizing beam splitter (PBS) 19b that transmits the light emitted from the LD 3 and guides it to the lens 19a, and guides the light reflected from the optical disk 1 to the PD 5.

  The slide feed mechanism 6 moves the pickup 2 from the inner circumference to the outer circumference or from the outer circumference to the inner circumference.

  The spindle motor 7 rotates the optical disc 1.

  The focus control unit 8 operates the actuator 4 based on the FE signal output from the FE detection unit 12 so that the recording surface of the optical disc 1 is focused.

  The feed mechanism control unit 9 controls the slide feed mechanism unit 6 to slide the pickup 2 in the radial direction of the optical disc 1 at a predetermined moving speed.

  The laser control unit 10 is a reproduction laser control unit (not shown) that controls the output power of the LD 3 to be a reproduction power necessary for reproducing data, and the output power of the LD 3 is a predetermined recording power. And a recording laser control unit (not shown) that controls so that the output of the LD 3 has a predetermined power.

  The rotation control unit 11 operates the spindle motor 7 to perform control so that the optical disc 1 has a predetermined number of rotations.

  The FE detection unit 12 detects a focus error (FE) and generates an FE signal.

  The TE detection unit 13 detects a tracking error (TE) and generates a TE signal.

  The RF amplifier unit 14 amplifies the level of the total addition signal of the reflected light received by the PD 5 to generate an RF signal.

  The system control unit 17 controls the feed mechanism control unit 9, the laser control unit 10, and the rotation control unit 11 based on the outputs of the TE detection unit 13 and the RF amplifier unit 14.

  In addition, the system control unit 17 sets timings for starting and stopping focus control with respect to the focus control unit 8.

  Also, the system control unit 17 sets the movement speed of the pickup 2, the setting of the movement start position, the start of movement of the pickup 2 in the inner circumferential direction or the outer circumferential direction, and the movement stop timing with respect to the feed mechanism control unit 9. Set up. In the present embodiment, the movement start position of the pickup 2 is the innermost circumferential position of the optical disc 1.

  In addition, the system control unit 17 sets the output level of the LD3 and the timing of starting and stopping the output of the LD3 so that the laser control unit 10 has a predetermined LD3 output. Note that the setting of the output level of the LD 3 can be changed based on the output of the TE detection unit 13 and the output of the RF amplifier unit 14.

  Furthermore, the system control unit 17 sets the number of rotations of the optical disc 1 and the timing for starting and stopping the rotation of the optical disc 1 with respect to the rotation control unit 11. Note that the setting of the rotational speed of the optical disc 1 can be changed based on the output of the TE detection unit 13 and the output of the RF amplifier unit 14.

  Further, the system control unit 17 has means (not shown) for holding various measurement data, and the means for holding may be a rewritable nonvolatile memory or a volatile memory.

The operation of the optical disk recording apparatus configured as described above will be described.
First, the pickup 2 is moved to the innermost circumferential position of the optical disc 1 that is the movement start position. Then, data reproduction of the optical disk 1 is started while rotating the optical disk 1 at a predetermined rotational speed. At this time, the laser current is output by controlling the current of the LD 3 so that the recording power level of the optical disk 1 does not change.

  The laser beam output from the LD 3 is applied to the recording surface of the optical disc 1, and the reflected light from the recording surface is received by the PD 5. When the FE signal is detected from the signal received by the PD 5, the actuator 4 is controlled to perform focus control so that the recording surface of the optical disc 1 is in focus.

  During the focus control, the pickup 2 is moved from the movement start position toward the outermost periphery at a predetermined movement speed.

  Here, the positional relationship between the rotation direction of the optical disc 1 and the movement direction of the pickup 2 will be described with reference to FIG. In FIG. 2, 21 is a view of the optical disc 1 of FIG. 1 as viewed from above, 22 is a rotation direction of the optical disc 21, 23 is a moving direction of the pickup 2 of FIG. 1, and 24 is a recording surface of the optical disc 21. A trajectory to be scanned is shown.

  The optical disk 21 is rotated in the rotation direction 22 at a predetermined number of rotations under the control of the rotation control unit 11. At this time, when the pickup 2 moves from the innermost periphery to the outermost periphery of the optical disk 21, the focus-controlled laser light scans on the recording surface of the optical disk 21 as indicated by a locus 24. In FIG. 2, the pickup 2 has moved in the movement direction 23 when the rotation of the optical disk 21 has been exactly five. However, although FIG. 2 illustrates the case of 5 rotations, any rotation may be used.

  FIG. 3 shows an enlarged view of the state in which the focus-controlled laser light scans the surface of the optical disc 21. In FIG. 3, 31 is a part of the optical disk 21 that is three-dimensionally enlarged, 32 is a part of the pickup 2 that is three-dimensionally enlarged, 33 is an area land other than the guide groove for tracking, and 34 is It is a groove that is a guide groove for tracking. Reference numeral 35 denotes the rotation direction of the optical disc 31. Reference numeral 36 denotes the moving direction of the pickup 2. 37 shows the irradiation direction of a laser beam.

  The laser beam whose focus is controlled on the recording surface of the optical disc 31 crosses between the land 33 and the groove 34 on the recording surface of the optical disc 31 as shown in the irradiation direction 37. At this time, since the heights of the land 33 and the groove 34 are physically different from each other, the focus control unit 8 controls the laser light so that the laser beam is focused in accordance with the irradiation area (the land 33 or the groove 34). .

  FIG. 4 shows the measurement sensitivity when the pickup 2 is moved in the moving direction 23. In FIG. 4, the vertical axis indicates the measurement sensitivity, and the horizontal axis indicates the recording position in the radial direction of the optical disc 21.

  When the recording sensitivity of the optical disc 21 is uniform from the inner periphery to the outer periphery, the measurement sensitivity measured at the inner periphery is constant. Further, when there is no guide groove for tracking from the inner periphery to the outer periphery, the land 33 and the groove 34 are not traversed, so the same region is always measured, and stable measurement sensitivity is obtained. Therefore, the measurement sensitivity of the optical disc 21 is a constant sensitivity from the inner periphery to the outer periphery, as indicated by a broken line 41.

  In practice, however, the recording sensitivity may deviate from the inner periphery toward the outer periphery, resulting in an upward increase as shown by the solid line 42. This indicates that the sensitivity increases toward the outer periphery. In addition, although it is rising to the right in FIG. 4, it may go down or go up and down.

  On the other hand, in order to measure the optical disk 21 at a high speed, the pickup 2 is moved at a predetermined moving speed by the slide feed mechanism unit 6, so that the reflected light is disturbed at a location crossing between the land 33 and the groove 34. Occurs. Therefore, as shown by the solid line 42, fine fluctuations appear in the measurement results.

  If the tracking control is performed on the tracking guide groove without crossing between the land 33 and the groove 34 so as to prevent such a minute fluctuation, all the same region is scanned and the minute fluctuation is caused. However, since all areas are scanned, there is a problem that it takes a very long time.

Therefore, in the present embodiment, the fine fluctuation is prevented from occurring as follows.
First, a case where the tracking error signal changes between the land 33 and the groove 34 will be described with reference to FIG.

  In FIG. 5, the horizontal axis represents time, and the vertical axis represents the level of the tracking error TE signal. 51 indicates the waveform of the TE signal when traversing between the land 33 and the groove 34, and 52 indicates the shape of the land 33 and the groove 34.

  As shown in FIG. 5, the TE signal 51 indicates that the TE signal is at the center position because there is no error when the focus-controlled laser light irradiation position is at the center of the tracking guide groove. Indicates zero level. However, when the irradiation position of the laser beam is a boundary portion other than the tracking guide groove and the guide groove, the error becomes the largest. That is, when moving from the land 33 to the groove 34, the maximum value TE1 is obtained, and when moving from the groove 34 to the land 33, the minimum value TE2 is obtained.

  In order to remove such an error, the system control unit 17 sets the threshold level 53 of the TE signal for removing the disturbance of the reflected wave when the pickup 2 crosses between the land 33 and the groove 34 of the optical disk 21. Set. Then, the recording sensitivity is measured from the output RF signal of the RF amplifier unit 14 which becomes the total addition signal of the reflected wave when the TE signal detected by the TE detection unit 13 is the threshold level 53 or less. Here, as shown in a range 54, the recording sensitivity is measured when the threshold level is 53 or less and the irradiation position is in the groove 34. The measurement results are shown in FIG.

  In FIG. 6, the vertical axis indicates the measurement sensitivity, and the horizontal axis indicates the recording position in the radial direction of the optical disc 21.

  A broken line 61 indicates the measurement sensitivity when the sensitivity is constant from the inner periphery to the outer periphery. For example, when the recording sensitivity of the optical disc 21 is uniform from the inner periphery to the outer periphery, the measurement sensitivity measured at the inner periphery is constant. Further, when there is no guide groove for tracking from the inner periphery to the outer periphery, the land 33 and the groove 34 are not traversed, so the same region is always measured, and stable measurement sensitivity, that is, from the inner periphery The sensitivity is constant up to the outer periphery.

  A solid line 62 indicates the recording sensitivity when the TE signal is below the set threshold level and the laser light irradiation position is the groove 34.

  As can be seen from FIG. 6, the RF signal when the irradiation position is in the land 33 region and the disturbance of the reflected light when traversing between the land 33 and the groove 34 are removed, and the irradiation position is in the groove 34 region. The recording sensitivity can be measured only at a certain time. As a result, fine fluctuations in recording sensitivity can be removed.

FIG. 7 shows an example in which the measurement result of FIG. 6 is replaced with the recording power ratio.
In FIG. 7, the vertical axis indicates the recording power ratio, and the horizontal axis indicates the recording position in the radial direction of the optical disc.

A broken line 71 indicates a case where the recording sensitivity is uniform.
A solid line 72 indicates a recording power ratio calculated backward from the measured sensitivity.

  In the case of FIG. 6, the recording sensitivity increases toward the outer periphery. Therefore, as shown by the solid line 72 in FIG. 7, the system control unit 17 sets a process for reducing the recording power at the outer periphery to the laser control unit 10. That's fine.

  Thus, when the recording sensitivity varies depending on the recording position, the recording laser power may be changed according to the recording position.

  In the present embodiment, the case where the level of the total addition signal of the reflected wave is measured when the TE signal is equal to or lower than the set threshold level and the irradiation position is the groove 34 has been described. The recording sensitivity may be measured when is less than a predetermined threshold level and the irradiation position is in the land 33 region. Thereby, since the recording sensitivity can be measured while discriminating the type of the guide groove, the measurement accuracy can be further improved.

  The system control unit 17 switches the area to be recorded (land area, groove area, or land / groove area) to measure the recording sensitivity, classifies the measurement results for each area, and the system control unit. 17 may be held.

  According to the optical disc recording apparatus according to the first embodiment, the recording sensitivity is measured from the total added signal level of the reflected wave when the detected TE signal is equal to or lower than the set threshold level, Since the recording power at the time of actual recording is changed according to the measurement result of the recording sensitivity, the reflected light generated when the pickup traverses between the land area and the groove area in the optical disk having the tracking guide groove exists. Disturbance can be eliminated and recording sensitivity can be measured stably, and recording power can be stably formed on the entire surface of the optical disk by changing the output level of recording power according to the measured recording sensitivity. Thus, errors in the formed recording marks can be reduced, and the recording power during recording can be controlled appropriately.

  Further, according to the optical disc recording apparatus according to the first embodiment, when the recording sensitivity is determined to be equal to or less than the threshold value set by the TE signal and the irradiation position of the laser beam is in the groove area Therefore, the measurement accuracy of the recording sensitivity can be further improved.

(Embodiment 2)
Hereinafter, an optical disk recording apparatus according to Embodiment 2 of the present invention will be described.
The difference from the first embodiment is that the recording sensitivity is measured while grasping the positional relationship between the rotating optical disc 1 and the pickup 2.

  FIG. 8 is a diagram showing a schematic configuration of the optical disc recording apparatus according to the second embodiment. 8, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  The optical disk recording apparatus shown in FIG. 8 includes an address detection unit 201 in addition to the configuration of the optical disk recording apparatus shown in FIG.

  The address detection unit 201 detects address information recorded in the wobble of the optical disc 1 and acquires a physical address of the optical disc 1. In the present embodiment, the position of the physical address on the innermost periphery of the optical disc 1 is set as the movement start position of the pickup 2.

The operation of the optical disk recording apparatus according to the second embodiment will be described below.
First, the pickup 2 is moved to the movement start position, and the optical disc 1 is rotated at a predetermined rotational speed. Then, data reproduction of the optical disk is started, and the pickup 2 is moved at a predetermined moving speed v [m / s].

  Here, it is assumed that the pickup 2 moves a predetermined distance L [m] in an arbitrary radial direction 23 from the movement start position, as shown in FIG. When the rotation speed of the optical disk 1 is r [rpm] and the optical disk rotates N times while the pickup 2 moves the distance L [m], the rotation time required for the N rotation of the optical disk 1 is tN [ s] = 60 / r × N, and the movement time required for the pickup 2 to move the distance L is tL [s] = L / v. In the present embodiment, the moving speed v [m / s] of the pickup 2 and the optical disk so that the time relationship of tN = tL is satisfied, that is, the optical disk rotates N times while the pickup 2 moves the distance L. The rotation speed r [rpm] is adjusted.

  Then, as in the first embodiment, the recording sensitivity is measured from the total added signal level of the reflected wave when the TE signal is equal to or lower than the threshold level, and the actual recording time is measured according to the measurement result of the recording sensitivity. Change the recording power.

  Next, a method for adjusting the moving speed of the pickup and the rotational speed of the optical disk will be described in detail.

  For example, when the pickup 2 is set to move the distance L from the movement start position during one rotation of the optical disk 1, 60 / r × 1 = L / v to satisfy the time relationship of tN = tL. The pickup 2 may be moved at a speed v [m / s] = L / (60 / r). In this case, the movement time is tL [s] = 60 / r. Further, when the pickup 2 is set to move the distance L from the movement start position while the optical disk 1 is rotated twice, 60 / r × 2 = L / v to satisfy the time relationship of tN = tL. The pickup 2 may be moved at a speed v [m / s] = L / (60 / r) × 1/2. In this case, the movement time is tL [s] = 60 / r × 2. When the pickup 2 is set to move the distance L from the movement start position while the optical disk 1 rotates N times, the pickup is performed at a moving speed v [m / s] = L / (60 / r) × 1 / N. Move it. In this case, the movement time is tL [s] = 60 / r × N.

  On the other hand, when the optical disk is to be rotated twice in the same time as the movement time v [m / s] required to rotate the optical disk 1 once, the number of rotations may be set to double.

  Thus, when the rotational speed of the optical disk is constant, the moving time is proportional to the number of rotations, and when the moving time of the pickup is constant, the rotational speed is proportional to the number of rotations. Therefore, when the optical disk rotates N times while the pickup moves the distance L, the recording sensitivity can always be measured at the same position by adjusting the rotation speed of the optical disk and the moving time of the pickup. That is, the positional relationship between the recording sensitivity measurement position and the physical address of the recording part can be grasped from the rotation number of the optical disk, the number of rotations, and the movement time of the pickup.

  It is possible to increase the number of measurement points, that is, the number of sampling data by adjusting the number of rotations of the optical disk to increase the scanning distance. For example, to increase measurement accuracy, increase the number of sampling data by increasing the number of rotations. To reduce measurement time, decrease the number of rotations and decrease the number of sampling data. You can do it.

  According to the optical disk recording apparatus according to the second embodiment, the rotational speed of the optical disk is set so that the pickup moves a predetermined distance L while the optical disk is rotated N times with reference to the movement start position of the pickup. Since the movement speed of the pickup is adjusted, the rotational speed of the optical disk and the movement speed of the pickup can be controlled in conjunction with each other, so the positional relationship between the position of the pickup on the optical disk and the physical address of the recording site The recording sensitivity can be measured at high speed while grasping the recording power, and the recording power corresponding to the recording region can be controlled during recording.

(Embodiment 3)
Hereinafter, an optical disk recording apparatus according to Embodiment 3 of the present invention will be described.
In the first and second embodiments, the measurement is performed in a spiral shape, but in the third embodiment, the recording sensitivity is measured only in an arbitrary radial direction.

  FIG. 9 shows a schematic configuration diagram of an optical disk recording apparatus according to the third embodiment. 9, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  The optical disk recording apparatus shown in FIG. 9 includes an address detection unit 301 and a timer 302 in addition to the configuration of the optical disk recording apparatus shown in FIG.

  The address detection unit 301 detects address information recorded in the wobble of the optical disc 1 and acquires a physical address of the optical disc 1. In the present embodiment, the position of the physical address on the innermost circumference of the optical disc 1 is set as the movement start position of the pickup 2.

  The timer 302 performs notification processing to the system control unit 17 at every set predetermined time.

Next, the operation of the optical disk recording apparatus according to the third embodiment will be described.
First, the pickup 2 is moved to the movement start position, and the optical disc 1 is rotated at a predetermined rotational speed. Then, data reproduction from the optical disk 1 is started, and the pickup 2 is moved at a predetermined moving speed. Notification processing is performed on the system control unit 17 every time set by the timer unit 302, and recording sensitivity is measured each time the system control unit 17 receives this notification. As a result, the recording sensitivity is measured only in a certain radial direction of the optical disc 1.

Here, how to determine the recording sensitivity measurement position according to the third embodiment will be described.
When the rotation period of the optical disk 1 at the rotation speed r [rpm] is T, and the angular velocity ω indicating the angle change amount per second,
T [s] = 60 / r,
ω [rad / s] = 2π / T = 2π (r / 60).

  Then, with respect to the center of the optical disc 1, assuming that the change in angle from the movement start position to the movement position of the pickup after the time change dt [s] is dθ, the position when the relationship of dθ [rad] = ωdt is satisfied is measured. And

  Therefore, when the system control unit 17 wants to measure the recording sensitivity only in the predetermined radial direction of the optical disc 1, when the rotation cycle is obtained from the rotation number of the optical disc 1 and the rotation cycle is set in the timer unit 302, the timer The unit 302 notifies the system control unit 17 every time when the set rotation cycle time elapses. As a result, the system control unit 17 measures the recording sensitivity at the time when the notification is received, and therefore measures the recording sensitivity only in a predetermined radial direction of the optical disc. Note that the angle dθ can be set to an arbitrary angle by changing the timing notified from the timer unit 302 to the system control unit 17.

  From the above, since the pickup 2 moves from the movement start position toward the outer periphery at the moving speed v [m / s], the recording sensitivity is measured for each rotation period T [s] for the number of rotations. It will be. Note that the recording sensitivity is measured from the total added signal level of the reflected wave at which the TE signal is equal to or lower than a predetermined threshold value as in the first embodiment, and recording at the time of actual recording is performed according to the measurement result. Change power.

  FIG. 10 shows the measurement position when the recording sensitivity is measured only in the predetermined radial direction. In FIG. 10, 81 is a view of the optical disc 1 as viewed from above, and 82 indicates the rotation direction of the optical disc 1.

  The recording sensitivity of the present embodiment is measured with respect to a radial direction 84 in which an angle formed by a straight line (referred to as an x-axis) connecting the center position of the optical disc 81 and the movement start position 83 of the pickup 2 is θ. Do. That is, as shown by the black circles, the measurement is performed when the pickup 2 moves on the straight line 84 whose angle with the x axis is θ.

  According to such an optical disk recording apparatus according to the third embodiment, the physical address position in the radial direction where the angle formed by the straight line connecting the center of the optical disk and the movement start position of the pickup is a predetermined angle is recorded on the recording medium. Since the sensitivity measurement position is used, the recording sensitivity can be measured only in an arbitrary radial direction from the center position of the optical disk, and the recording sensitivity measurement time can be shortened.

(Embodiment 4)
Hereinafter, an optical disk recording apparatus according to Embodiment 4 of the present invention will be described.
The difference from the first embodiment is that the recording sensitivity is measured in units of zones for an optical disk whose substrate surface is divided into a plurality of zones from the inner periphery toward the outer periphery.

  FIG. 11 is a diagram showing a schematic configuration of the optical disc recording apparatus according to the fourth embodiment. In FIG. 11, the same components as those of FIG.

  The optical disk recording apparatus shown in FIG. 11 further includes an address detection unit 401 in addition to the configuration of the optical disk recording apparatus shown in FIG.

  The address detection unit 401 detects address information recorded in the wobble of the optical disc 1 and acquires a physical address of the optical disc.

  In the present embodiment, as shown in FIG. 12A, the optical disc 1 is a recording medium 91 that is divided into, for example, three zones and recorded at different recording speeds for each zone.

  In FIG. 12, an optical disc 91 is viewed from above the optical disc 1 and is divided into three zones 92-94. These divided areas were designated as zone A, zone B, and zone C from the inner periphery side. Here, an example in which the optical disc 91 is divided into three regions is shown, but the number of divisions is arbitrary.

  The system control unit 17 can grasp the positional relationship of each zone area based on the address information from the address detection unit 401.

Next, the operation of the optical disk recording apparatus according to the fourth embodiment will be described.
First, the pickup 2 is moved to the movement start position, and the optical disc 91 is rotated at a predetermined rotational speed. Then, data reproduction from the optical disk 91 is started, the pickup 2 is moved at a predetermined moving speed, and the recording sensitivity for each zone is measured. At this time, the recording sensitivity is measured from the total added signal level of the reflected wave when the TE signal is equal to or lower than a predetermined threshold level as in the first embodiment.

  Then, the total added signal level of the output of the RF amplifier unit 14 of the reflected wave measured in the zone A92, the zone B93, and the zone C94 is averaged, and recording at the time of actual recording is performed according to the averaged measurement result. Change power in zones.

  FIG. 12B shows the recording sensitivity after averaging for each zone of the optical disc 91. In the figure, the vertical axis indicates the measurement sensitivity, and the horizontal axis indicates the position in the radial direction of the optical disc.

  The averaged recording sensitivity for each zone is as shown by the solid line 95 in FIG. A dotted line 96 indicates the case where the recording sensitivity is uniform in all regions.

  As can be seen from this figure, since the measurement sensitivity is averaged for each zone, the measurement sensitivity is uniform within the same zone area.

  FIG. 13 shows the recording power ratio and positional relationship for each zone of the optical disk 91. In FIG. 13, the vertical axis indicates the recording power ratio, and the horizontal axis indicates the position in the radial direction of the optical disk. A broken line 101 indicates a case where the recording sensitivity is uniform.

  The recording power ratio calculated from the averaged recording sensitivity for each zone shown in FIG. This indicates that the recording power ratio is uniformly changed for each zone, and recording is performed with a constant recording power in the same zone area.

  As described above, by uniformly acquiring the recording sensitivity in the same zone area, it is possible to perform recording uniformly with the same recording power in the same zone area.

  According to the optical disk recording apparatus according to the fourth embodiment, the positional relationship between the pickup position and the physical address of each zone area of the optical disk with respect to the optical disk whose substrate surface is divided into a plurality of zones. Based on the results of measuring and recording the recording sensitivity for each zone and averaging each, the recording power output level at the time of recording was changed. The measurement time can be shortened, and the positional relationship between the pickup position and the zone area at the time of recording can be ascertained, so the recording power corresponding to the zone area to be recorded can be controlled during recording. It can be carried out.

(Embodiment 5)
Hereinafter, an optical disk recording apparatus according to Embodiment 5 of the present invention will be described.
The difference from Embodiments 1 to 4 is that high-precision recording sensitivity can be realized even for a partially recorded optical disk in which marks and spaces are mixed.

  FIG. 14 is a diagram showing a schematic configuration of the optical disk recording apparatus according to the fifth embodiment. 14, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  The optical disk recording apparatus shown in FIG. 14 further includes a hold unit 501 in addition to the configuration of the optical disk recording apparatus shown in FIG.

  The hold unit 501 detects and holds the peak level or bottom level of the reflected wave RF signal. The system control unit 17 switches whether to detect the peak level or the bottom level. When the reflected light level at the location where the recording mark exists is high due to the characteristics of the recording film of the recording medium or PD5, the reflected light level at the location where the recording mark does not exist can be obtained low, so that the bottom level is detected. To do. On the contrary, when the reflected light level at the location where the recording mark exists is low, the reflected light level at the location where the recording mark does not exist can be obtained high, so the peak level is detected.

Next, the operation of the optical disk recording apparatus according to the fifth embodiment will be described.
First, the pickup 2 is moved to the movement start position, and the optical disc 1 is rotated at a predetermined rotational speed. Then, data reproduction from the optical disk 1 is started, and the pickup 2 is moved at a predetermined moving speed. The waveform of the reflected light at this time is shown in FIG.

  In FIG. 15, the reflected light waveform 111 in the case where a recording mark is present has a high reflected light level at a location where the recording mark exists, as indicated by a direction 112, for example, and a recording mark as indicated by a direction 113. The reflected light level in a portion (space) where no is present becomes low.

  As indicated by the direction 113, the reflected light level at the portion where the recording mark does not exist, that is, the space portion is lowered, so the hold unit 501 detects the bottom level 114 of the reflected light waveform 111 and holds the value. To do.

  Then, as in the first embodiment, the recording sensitivity is measured from the bottom level of the total reflected signal of the held reflected light when the TE signal is equal to or lower than a predetermined threshold level, and the recording sensitivity is determined according to the recording sensitivity. The recording power during actual recording was changed.

  According to the optical disk recording apparatus according to the fifth embodiment as described above, when the optical disk is a recording medium in which marks and spaces are mixed, at the time of data reproduction of the optical disk, the irradiation position of the laser beam is the space of the optical disk. Since the level of the total addition signal of the reflected wave is held and the recording sensitivity is measured based on the held level, it is possible to improve the recording sensitivity measurement accuracy for a partially recorded optical disc. it can.

  The optical disk recording apparatus according to the present invention has means for measuring the sensitivity of the optical disk at high speed before recording, and is useful for improving the recording quality. It can also be applied to applications such as inspection of unrecorded optical disks.

1 is a schematic configuration diagram of an optical disc recording apparatus according to Embodiment 1 of the present invention. It is a figure which shows the positional relationship of the rotation direction of an optical disk, and the moving direction of a pick-up. It is an enlarged view which shows the positional relationship which a laser beam moves on the surface of an optical disk. It is a figure which shows the relationship between the position of the radial direction of an optical disk, and a measurement sensitivity. It is a figure which shows TE signal detected when a laser beam moves on the surface of an optical disk. It is a figure which shows the relationship between the position of the radial direction of an optical disk when a recording sensitivity is measured from the total addition signal level of the reflected wave in which TE signal becomes below a predetermined threshold level, and a measurement sensitivity. It is a figure which shows the recording power ratio at the time of recording, and positional relationship in the said Embodiment 1. FIG. It is a schematic block diagram of the optical disk recording device by Embodiment 2 of this invention. It is a schematic block diagram of the optical disk recording device by Embodiment 3 of this invention. It is a figure which shows the positional relationship of the radial direction of an optical disk. It is a schematic block diagram of the optical disk recording device by Embodiment 4 of this invention. It is a figure which shows the measurement sensitivity in the zone unit of an optical disk. It is a figure which shows the recording power ratio at the time of recording in a zone unit, and a positional relationship. It is a schematic block diagram of the optical disk recording device by Embodiment 5 of this invention. It is a figure which shows the waveform of reflected light when a recording mark exists.

Explanation of symbols

1 Optical disc 2 Pickup 3 Laser diode (LD)
4 Actuator 5 Photodetector (PD)
6 Slide feed mechanism unit 7 Spindle motor 8 Focus control unit 9 Feed mechanism control unit 10 Laser control unit 11 Rotation control unit 12 Focus error (FE) detection unit 13 Tracking error (TE) detection unit 14 RF amplifier unit 17 System control unit 21 Optical disk 22 Rotation direction 23 Pickup movement direction 24 Trajectory 31 Optical disk 32 Pickup 33 Land 34 Groove 35 Rotation direction 36 Pickup movement direction 37 Laser light irradiation direction 81 Optical disk 82 Rotation direction 83 Movement start position 84 Recording sensitivity measurement direction 91 Optical disk 92 Zone A
93 Zone B
94 Zone C
201, 301, 401 Address detection unit 302 Timer unit 501 Hold unit

Claims (6)

Recording by a groove recording method for recording in a groove area of an optical disc having a tracking guide groove, or by a land / groove recording method for recording in both the groove area and a land area other than the tracking guide groove In an optical disk recording apparatus for forming a mark,
A feed mechanism that moves a pickup having a laser light source that emits laser light at a predetermined moving speed from the inner periphery to the outer periphery or from the outer periphery to the inner periphery;
A reproduction laser control unit for controlling the output power of the laser light source so as to be a reproduction power necessary for data reproduction of the optical disc;
A recording laser control unit for controlling the output power of the laser light source to be a predetermined recording power;
An FE detector for detecting a focus error (FE) signal from the reflected wave of the optical disc;
A focus control unit that performs focus servo control based on the TE signal;
A TE detector for detecting a tracking error (TE) signal from the reflected wave of the optical disc;
A rotation control unit that rotates the optical disc at a predetermined rotation number;
A reflected wave level measurement unit that measures the level of a total addition signal of reflected waves from the optical disc when the optical disc is irradiated with output light from the laser light source,
Providing a threshold level of the TE signal for removing disturbance of the reflected wave when the pickup crosses between a land area and a groove area of the optical disc;
At the time of reproducing the optical disc, the recording sensitivity is measured from the level of the total addition signal of the reflected wave when the TE signal detected by the TE detection unit is not more than the threshold level, and the measurement result of the recording sensitivity The recording power at the time of actual recording was changed according to the
An optical disk recording apparatus characterized by the above. The optical disk recording apparatus according to claim 1,
The measurement of the recording sensitivity is performed in either the land region or the groove region where the laser light is irradiated.
An optical disk recording apparatus characterized by the above. In the optical disk recording apparatus according to claim 1 or 2,
An address detector for acquiring a physical address of the optical disc,
The position of an arbitrary physical address of the optical disk is set as a movement start position of the pickup, and the optical disk rotates a predetermined number of times while the pickup moves a predetermined distance in the radial direction from the movement start position. Adjust the moving speed of the pickup and the rotation speed of the optical disc, and measure the recording sensitivity.
An optical disk recording apparatus characterized by the above. The optical disk recording apparatus according to any one of claims 1 to 3,
An address detector for acquiring a physical address of the optical disc,
The position of an arbitrary physical address on the optical disk is the movement start position of the pickup, and the physical address position in the radial direction in which an angle formed by a straight line connecting the center of the optical disk and the movement start position is a predetermined angle, Set the recording sensitivity measurement position.
An optical disk recording apparatus characterized by the above. The optical disk recording apparatus according to any one of claims 1 to 4,
An address detector for acquiring a physical address of the optical disc,
The optical disc is a recording medium that is divided into a plurality of zones and records at different recording speeds for each zone,
Based on the address information from the address detector, grasp the physical address of each zone area of the optical disc, measure the recording sensitivity for each zone,
Based on the result of averaging the recording sensitivity for each zone, the output level of the recording power is changed.
An optical disk recording apparatus characterized by the above. The optical disk recording apparatus according to any one of claims 1 to 5,
The optical disc is a recording medium in which marks and spaces are mixed,
A holding unit that holds the level of the total addition signal of the reflected wave when the irradiation position of the laser beam is a space of the optical disc during data reproduction of the optical disc;
The recording sensitivity is measured based on the level held by the holding unit.
An optical disk recording apparatus characterized by the above.

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