JP2014186760A - Reproducing and recording apparatus, and reproducing and recording method of optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reproducing and recording apparatus and a reproducing and recording method of an optical recording medium, which can avoid overwrite into a recorded region even if the optical recording medium is deformed.SOLUTION: The reproducing and recording apparatus of an embodiment includes a rotary drive unit, an optical device, a storage unit, and a control unit. The storage unit stores, as a threshold, an intensity distribution of a normal third laser beam received by a light receiving element. The control unit adjusts a radial gap of the optical recording medium between beam spots of a first laser beam and of a second laser beam to be identical to a radial gap of the optical recording medium of a recording track on a recording layer. The reproducing and recording apparatus further compares the threshold with the intensity distribution of the third laser beam that is received by the light receiving element when any of the first laser beam, the second laser beam or the third laser beam track the recording layer or the guide layer and that is reflected on the guide layer, to thereby detect a slope of the third laser beam with respect to an optical axis.

Description

  Embodiments described herein relate generally to a reproducing / recording apparatus and an optical recording medium reproducing / recording method.

  Conventionally, optical discs such as DVD (Digital Versatile Disc) and BD (Blu-ray Disc (registered trademark)) are known as optical recording media. Such an optical recording medium is formed to be capable of reproducing information or reproducing and recording information. Optical recording media have technologies to increase the recording density in the recording layer by shortening the laser wavelength, increasing the NA of the objective lens, using a recording medium material suitable for high-density recording, and measures against noise in reproduction signal processing, etc. Are known.

  Further, as a technique for increasing the recording density, an optical recording medium in which a guide layer and a recording layer are multilayered, and a drive device that performs recording or reproduction of the optical recording medium are known.

  In such an optical recording medium, deformation such as warping due to internal stress may occur due to environmental changes such as temperature and humidity, and aging. When the deformation occurs, the optical recording medium may lose its function such as generation of a non-recorded area or overwriting of a recorded area.

  In particular, in a multilayered optical recording medium, since the distance between the guide layer and the recording layer becomes long, the influence of deformation of the optical recording medium becomes large.

JP 2011-258272 A US Pat. No. 6,584,174

  An object of the present invention is to provide a reproducing / recording apparatus and a reproducing / recording method for an optical recording medium that can avoid overwriting a recorded area even when the optical recording medium is deformed.

  The playback / recording apparatus according to the embodiment includes a rotation driving unit, an optical device, a storage unit, and a control unit. The rotation driving unit rotates an optical recording medium having a substrate, a guide layer provided on the substrate and having radial position information recorded thereon, and a recording layer provided on the substrate and capable of recording information. The optical device emits an objective lens facing the optical recording medium rotated by the rotation driving unit, a driving unit for driving the objective lens to an arbitrary position in the radial direction, and a laser beam irradiated on the recording layer. A recording layer light source; a diffraction grating that divides the laser light emitted from the recording layer light source into a first laser light and a second laser light; and a third laser light having a wavelength different from that of the laser light emitted from the recording layer light source. A guide layer light source that emits light is provided. An optical device includes a light receiving element that receives the first laser light, the second laser light, and the third laser light reflected by the recording layer and the guide layer, and the first laser light and the second laser. And a lens device that guides the light and the third laser light to the objective lens and the light receiving element and is capable of focusing and tracking the first laser light, the second laser light, and the third laser light. The storage unit stores an intensity distribution of normal third laser light received by the light receiving element as a threshold value. The control unit is configured such that a radial interval of the optical recording medium between the light beam spots of the first laser beam and the second laser beam is the same as a radial interval of the recording track of the recording layer of the optical recording medium. And the first laser beam, the second laser beam, or the third laser beam is reflected by the guide layer received by the light receiving element when following the recording layer or the guide layer. The intensity distribution of the third laser beam is compared with the threshold value, and the inclination of the third laser beam with respect to the optical axis is detected.

1 is a plan view showing a configuration of an optical recording medium used in a reproducing / recording apparatus according to an embodiment. Explanatory drawing which shows the principal part structure of the same optical recording medium. Explanatory drawing which shows the structure of the reproduction | regeneration recording device. Sectional drawing which shows an example of use of the reproduction | regeneration recording device typically. Explanatory drawing which shows an example of use of the reproduction | regeneration recording device typically. Explanatory drawing which shows an example of use of the reproduction | regeneration recording device typically. Explanatory drawing which shows an example of use of the reproduction | regeneration recording device typically. Explanatory drawing which shows an example of use of the reproduction | regeneration recording device typically. FIG. 3 is an explanatory diagram schematically showing one recording method of an optical recording medium using the same reproduction recording apparatus. FIG. 3 is an explanatory diagram schematically showing one recording method of an optical recording medium using the same reproduction recording apparatus. FIG. 3 is an explanatory diagram schematically showing one recording method of an optical recording medium using the same reproduction recording apparatus. 6 is a flowchart showing one recording method of an optical recording medium using the same reproduction recording apparatus.

Hereinafter, a reproducing / recording method of the reproducing / recording apparatus 1 and the optical recording medium 100 according to the present embodiment will be described with reference to FIGS.
FIG. 1 is a plan view showing a configuration of an optical recording medium 100 used in a reproducing / recording apparatus 1 according to an embodiment. FIG. 2 is a main configuration of the optical recording medium 100, specifically, a line II-II in FIG. FIG. 3 is an explanatory view schematically showing the configuration of the recording / reproducing apparatus 1, and FIG. 4 is an example of the use of the reproducing / recording apparatus 1. FIG. FIG. 3 is an explanatory diagram schematically showing a configuration during reproduction and recording of the optical recording medium 100.

  FIG. 5 is an example of the use of the reproducing / recording apparatus 1 and is an explanatory diagram schematically showing the intensity distribution of the reflected laser beam 99. FIG. 6 is an example of the use of the reproducing / recording apparatus 1, and the laser beam 98a and FIG. 7 is an example of the use of the reproduction / recording apparatus 1, schematically illustrating the correction of the laser beam 99, and FIG. 8 is a reproduction / recording apparatus. 1 is an explanatory diagram schematically showing a relationship between laser beams 98a and 99 and an optical axis C.

  FIG. 9 is an explanatory view schematically showing a process of irradiating the guide track 200 with the laser beam 99, which is one of the recording methods of the optical recording medium 100 using the reproducing / recording apparatus 1. FIG. FIG. 11 is an explanatory diagram schematically showing a process of correcting the laser beam 99, which is one of the recording methods of the optical recording medium 100 using the recording medium. FIG. 11 shows one of the recording methods of the optical recording medium 100 using the reproduction recording apparatus 1. FIG. 12 is a flowchart schematically showing a recording method of the optical recording medium 100 using the reproducing / recording apparatus 1.

(Optical recording medium 100)
The optical recording medium 100 is formed so that information can be recorded and reproduced by the reproduction recording apparatus 1 or the like. As shown in FIG. 1, an optical recording medium 100 is formed in a disk shape, and has a clamp portion 101 that is a support region fixed to the reproduction recording device 1 or the like at the center thereof, and a recording region 102 that records information. Have. The clamp portion 101 has a hole 101a at the center thereof. The optical recording medium 100 is, for example, a so-called multilayer optical recording medium composed of a plurality of recording layers and a plurality of guide layers.

  Specifically, as shown in FIG. 2, the optical recording medium 100 includes a substrate 110, a guide layer group 111, a recording layer group 112, and a cover layer 113 in the recording area 102. In the optical recording medium 100, a recording region 102 is formed by sequentially providing a guide layer group 111, a recording layer group 112, and a cover layer 113 on a substrate 110.

  The substrate 110 is made of a resin material such as polycarbonate, and a clamp portion 101 is formed at the center thereof. The substrate 110 is formed to support the guide layer group 111, the recording layer group 112, and the cover layer 113.

  The guide layer group 111 includes a plurality of guide layers that are provided on the substrate 110 and perform positioning in the radial direction of an optical device 4 (to be described later) of the reproduction recording apparatus 1. The radial direction is the radial direction of the optical recording medium 100.

  The guide layer of the guide layer group 111 is formed by, for example, a guide track 200 that is formed in a spiral groove structure and has a row with reflection of light accompanied by diffracted light. Specifically, as shown in FIG. 2, the guide layer group 111 includes a first guide layer 121 and a second guide layer 122 from the substrate 110 side.

  The first guide layer 121 and the second guide layer 122 each have a groove structure in which a land that is a convex portion and a groove that is a concave portion are formed as the guide track 200. In the first guide layer 121 and the second guide layer 122, information on the track position for positioning the optical device 4 is recorded.

  The track position is, for example, a track number indicating a track position of the optical recording medium 100, and information indicating the track position of the guide track 200 is recorded in advance on the first guide layer 121 and the second guide layer 122. ing.

  The recording layer group 112 includes a plurality of recording layers capable of recording information. For example, the recording layer group 112 includes the first recording layer 131, the second recording layer 132, the third recording layer 133, the fourth recording layer 134, the fifth recording layer 135, and the sixth recording layer from the substrate 110 side. The recording layer 136, the seventh recording layer 137, the eighth recording layer 138, the ninth recording layer 139, and the tenth recording layer 140 are provided. The recording layer of the recording layer group 112 is formed by recording tracks 201 formed in a spiral shape.

  The first recording layer 131, the third recording layer 133, the fifth recording layer 135, the seventh recording layer 137, and the ninth recording layer 139 are, for example, information on the guide track of the first guide layer 121 in the radial direction. Is positioned based on In addition, the second recording layer 132, the fourth recording layer 134, the sixth recording layer 136, the eighth recording layer 138, and the tenth recording layer 140 have, for example, the radial positions of the guide tracks of the second guide layer 122. Positioning is performed based on 200 information.

  Further, in the recording layer group 112, arbitrary information is recorded on a part of each of the recording layers 131 to 140 by the reproducing / recording apparatus 1 described later, in other words, on the recording track 201 shown in FIG. The cover layer 113 is made of a light transmissive material and protects the recording layer group 112.

  4 shows a cross section of the optical recording medium 100, schematically showing only the first guide layer 121 and the tenth recording layer 140, and also showing the guide track 200 and the recording track 201. . In each figure, the guide track 200 and the recording track 201 are described by adding reference numerals 200 and 201 to the displayed portions for convenience of explanation. However, the guide track 200 and the recording track 201 are optically recorded. In the medium 100, it is continuously formed integrally in a spiral shape.

(Reproduction recording apparatus 1)
The reproducing / recording apparatus 1 is formed so that information can be recorded on the optical recording medium 100 and information recorded on the optical recording medium 100 can be reproduced.

  As shown in FIG. 3, the playback / recording apparatus 1 includes a rotation drive unit 3 that rotates the optical recording medium 100, an optical device 4 that can irradiate the optical recording medium 100 with laser light, and the rotation drive unit 3 and the optical device 4. And a control device 5 for controlling.

  The rotation drive unit 3 includes a disk clamp 11, a spindle motor 12, and a rotary encoder 13. The disc clamp 11 is formed so as to be able to support the optical recording medium 100 by fitting into the hole 101 a of the clamp portion 101 of the optical recording medium 100. The spindle motor 12 is formed to be able to rotate the optical recording medium 100 supported by the disk clamp 11. The rotary encoder 13 is formed so as to be able to detect the rotation angle and the number of rotations of the spindle motor 12.

  The optical device 4 includes a feeding device 21, an objective lens device (lens device) 22, a recording layer optical device 23 capable of emitting two laser beams 98a and 98b, and a guide layer optical device 24 capable of emitting a laser beam 99. And a dichroic mirror (DM) 25.

  The feeding device 21 includes a support 31 formed to support the objective lens device 22, the recording layer optical device 23, the guide layer optical device 24 and the DM 25, and the optical recording medium 100 having the support 31 supported by the disc clamp 11. And a feed motor 32 that is a driving means for moving the lens in the radial direction.

  The objective lens device 22 includes an objective lens 34 formed so as to be able to converge the laser beams 98a, 98b, and 99 incident from the recording layer optical device 23 and the guide layer optical device 24, and a laser beam 98a passing through the objective lens 34. The first actuator 35 that adjusts the focus positions of 98b and 99, and the second actuator 36 that adjusts the radial position irradiated by the laser beams 98a, 98b, and 99 passing through the objective lens 34 are provided.

  The objective lens 34 is disposed to face the cover layer 113 of the optical recording medium 100 supported by the disc clamp 11. As shown in FIG. 4, the objective lens 34 emits the supplied laser beams 98a, 98b, and 99. As shown in FIG. 4, the objective lens 34 converges the laser beams 98a, 98b, and 99, so that the optical beam spots 298a, 298b, 299 can be generated.

  The first actuator 35 drives the objective lens 34 to adjust the convergence position of the laser light 98a, 98b, 99 in the objective lens 34 in the optical axis direction. The first actuator 35 adjusts the convergence positions of the laser beams 98 a, 98 b, and 99 in the optical axis direction, thereby causing the light beam spots 298 a, 298 b, and 299 to pass through the guide layer group 111 and the recording layer group 112 of the optical recording medium 100. On any layer, for example, in FIG. 4, the first guide layer 121 and the tenth recording layer 140 are aligned.

  The second actuator 36 adjusts the radial position of the laser light 98a, 98b, 99 in the objective lens 34 by driving the objective lens 34. The second actuator 36 adjusts the radial positions of the laser beams 98a, 98b, and 99 so that the light beam spots 298a, 298b, and 299 are arranged in the radial direction of any of the guide layer group 111 and the recording layer group 112. Perform alignment.

  The recording layer optical device 23 includes a recording layer light source 37, a collimator lens 38, a polarization beam splitter (PBS) 39, a recording layer lens device (lens device) 40, a condenser lens 41, a light receiving element 42, a diffraction element. And a lattice 43. The recording layer optical device 23 divides one laser beam 98 into two laser beams (first laser beam) 98 a and laser beam (second laser beam) 98 b by the diffraction grating 43, and outputs one of the recording layer groups 112. The layers (recording layers 131 to 140) are formed so as to be able to irradiate laser beams 98a and 98b. The recording layer optical device 23 is formed so as to be able to receive the laser beams 98 a and 98 b reflected from any one of the recording layer group 112.

  The recording layer light source 37 has a light emitting element and is a supply source of the laser light 98 formed so that the laser light 98 can be emitted from the light emitting element. The laser beam 98 emitted from the recording layer light source 37 has a wavelength shorter than that of the laser beam 99 emitted from the guide layer light source 47. The laser beam 98 is, for example, a blue laser.

  The recording layer light source 37 is a laser beam having a different output value when reproducing information recorded in any one of the recording layer group 112 and recording information in any one of the recording layer group 112. Is formed so as to be capable of emitting light. The laser beam 98 during reproduction has a weaker output value than the laser beam 98 used during recording. The collimator lens 38 is formed so that the laser beam 98 emitted from the recording layer light source 37 can be converted into parallel light.

  The PBS 39 is formed so as to reflect or transmit the laser beams 98a and 98b. The PBS 39 is formed so that the laser beams 98 a and 98 b divided by the diffraction grating 43 can be supplied to the DM 25. The PBS 39 is formed so that the laser beams 98a and 98b supplied from the DM 25 can be supplied to the condenser lens 41. The PBS 39 includes, for example, a quartz wavelength plate (QWP) between the recording layer lens device 40.

  The recording layer lens device 40 is formed to be able to focus and track the laser beams 98a and 98b passing between the PBS 39 and the DM 25. The recording layer lens device 40 includes a recording layer lens 44 that transmits laser beams 98 a and 98 b supplied from the PBS 39 or DM 25 and makes it parallel light, and a third actuator 45 that performs focusing of the recording layer lens 44. Yes. The recording layer lens device 40 may include a fourth actuator that performs tracking of the recording layer lens 44.

  The condensing lens 41 converges the parallel laser beam 98 supplied from the DM 25 via the recording layer lens device 40 and the PBS 39 and emits it to the light receiving element 42.

  The light receiving element 42 receives the laser beams 98a and 98b converged by the condenser lens 41, and uses the information recorded in any one of the recording layer group 112 as a signal based on the received laser beams 98a and 98b. Convert.

  The diffraction grating 43 is formed so that the parallel laser beam 98 converted by the collimator lens 38 can be divided into laser beams 98 a and 98 b and supplied to the PBS 39. The diffraction grating 43 is formed to be rotatable, and is formed so as to be able to adjust a radial width H between the light beam spots 298a and 298b by rotating.

The guide layer optical device 24 includes a guide layer light source 47, a collimator lens 48, a polarization beam splitter (PBS) 49, a guide layer lens device (lens device) 50, a condensing lens 51, and a light receiving element 52. I have. The guide layer optical device 24 irradiates one of the guide layer groups 111 (the first guide layer 121 or the second guide layer 122) with a laser beam (third laser beam) 99 and The laser beam 99 reflected from the layer is formed so as to be receivable.
The guide layer light source 47 is a supply source of the laser beam 99 having a transmitting element and formed so that the laser beam 99 can be emitted from the transmitting element. The laser beam 99 emitted from the guide layer light source 47 has a wavelength longer than that of the laser beam 98 emitted from the recording layer light source 37. The laser beam 99 is, for example, a red laser. The collimator lens 48 is formed so that the laser beam 99 emitted from the guide layer light source 47 can be converted into parallel light.

  The PBS 49 is formed so as to reflect or transmit the laser beam 99. The PBS 49 is formed so that the parallel laser beam 99 converted by the collimator lens 48 can be supplied to the DM 25. The PBS 49 is formed so that the parallel laser beam 99 supplied from the DM 25 can be supplied to the condenser lens 51. The PBS 49 has, for example, a quartz wavelength plate (QWP) between the guide layer lens device 50.

  The guide layer lens device 50 is formed to be able to focus and track the laser beam 99 passing between the PBS 49 and the DM 25. The guide layer lens device 50 performs tracking of the guide layer lens 54 that guides the guide layer lens 54 that passes the parallel laser beam 99 supplied from the PBS 49 or the DM 25, the fifth actuator 55 that focuses the guide layer lens 54, and the guide layer lens 54. And a sixth actuator 56 for performing.

  The condenser lens 51 converges the parallel laser beam 99 supplied from the DM 25 via the guide layer lens device 50 and the PBS 49 and emits the laser beam 99 to the light receiving element 52.

  The light receiving element 52 receives the laser beam 99 converged by the condenser lens 51, and converts information recorded in any one of the guide layer groups 111 into a signal based on the received laser beam 99.

  The DM 25 is formed so that the laser beams 98a, 98b, 99 supplied from the recording layer optical device 23 and the guide layer optical device 24 can be supplied to the objective lens 34, and the laser beams 98a, 98b, 99 can be reflected and transmitted. ing. The DM 25 is formed so that the laser beams 98 a, 98 b, and 99 reflected by the optical recording medium 100 can be supplied to the recording layer optical device 23 and the guide layer optical device 24.

  The control device 5 includes a spindle motor control unit 61, a feed motor control unit 62, an objective lens control unit 63, a recording layer control unit 64, a guide layer control unit 65, a signal bus 66, and a main control unit (control). Part) 67.

  The spindle motor control unit 61 is connected to the spindle motor 12 and the rotary encoder 13, and controls the drive of the spindle motor 12 so that the number of rotations of the optical recording medium 100 supported by the disk clamp 11 can be controlled. Yes.

  The feed motor control unit 62 is connected to the feed motor 32 and controls the drive of the feed motor 32 so that the moving distance of the objective lens 34 supported by the support 31 can be controlled.

  The objective lens control unit 63 includes a first control unit 71 that controls the first actuator 35 and a second control unit 72 that controls the second actuator 36. The first control unit 71 is formed to control the focusing of the objective lens 34 by controlling the first actuator 35. The first control unit 71 is an objective lens focus drive control unit. The second control unit 72 is configured to control the tracking of the objective lens 34 by controlling the second actuator 36. The second control unit 72 is an objective lens tracking drive control unit.

  The recording layer control unit 64 includes a third control unit 73 for controlling the third actuator 45, a recording layer high frequency amplifier (RF amplifier) 75, a recording layer error signal generation unit 76, a recording layer reproduction signal generation unit 77, It has.

  The third control unit 73 is configured to control the focusing of the recording layer lens 44 by controlling the third actuator 45. The third control unit is a recording layer focus drive control unit.

  The recording layer RF amplifier 75 is formed so as to be able to amplify signals of the laser beams 98a and 98b converted by the light receiving element.

  The recording layer error signal generation unit 76 is connected to the third control unit 73 and the recording layer RF amplifier 75 and is also connected to the main control unit 67 via the signal bus 66. The recording layer error signal generation unit 76 is a detection unit that detects the track positions of the laser beam 98a and the light beam spots 298a and 298b of the laser beam 98b irradiated on any recording layer of the recording layer group 112.

  Specifically, the recording layer error signal generation unit 76 uses the laser light 98a and 98b received by the light receiving element 42 to generate the position of the recording layer group 112 and the laser light 98a and 98b emitted from the objective lens 34 and condensed. The recording layer error signal level can be generated as the amount of deviation from the condensing position. That is, the recording layer error signal level is a positional deviation amount of any recording layer in the recording layer group 112 in the focusing control direction of the laser beams 98a and 98b.

  The recording layer reproduction signal generation unit 77 is formed so as to be able to generate a reproduction signal for reproducing information from the information of the laser beams 98 a and 98 b received by the light receiving element 42.

  The guide layer control unit 65 includes a fifth control unit 79 that controls the fifth actuator 55, a sixth control unit 80 that controls the sixth actuator 56, a guide layer high-frequency amplifier (RF amplifier) 81, and a guide layer error signal. A generation unit 82 and a guide layer reproduction signal generation unit 83 are provided.

  The fifth control unit 79 is formed to control the focusing of the guide layer lens 54 by controlling the fifth actuator 55.

  The sixth control unit 80 can adjust the optical axis by controlling the sixth actuator 56 and driving the guide layer lens 54 so that the intensity distribution of the laser light 99 received by the light receiving element 52 is uniform. Is formed. The guide layer RF amplifier 81 is formed so as to be able to amplify information of the laser beam 99 converted by the light receiving element 52.

  The guide layer error signal generation unit 82 is connected to the fifth control unit 79, the sixth control unit 80, and the guide layer RF amplifier 81, and guides one of the guide layer groups 111 from the laser beam 99 received by the light receiving element 52. The guide layer error signal level can be generated as a deviation amount between the position of the layer and the condensing position of the laser beam 99 emitted and condensed by the objective lens 34.

  The guide layer reproduction signal generator 83 is formed so as to be able to generate a reproduction signal from the information of the laser beam 99 received by the light receiving element 52.

  The signal bus 66 includes a spindle motor control unit 61, a feed motor control unit 62, a main control unit 67, a first control unit 71, a second control unit 72, a third control unit 73, a recording layer error signal generation unit 76, and a recording layer. The reproduction signal generation unit 77, the fifth control unit 79, the sixth control unit 80, the guide layer error signal generation unit 82, and the guide layer reproduction signal generation unit 83 are formed to be connectable.

  The main control unit 67 includes a spindle motor control unit 61, a feed motor control unit 62, a first control unit 71, a second control unit 72, a third control unit 73, and a recording layer error signal generation connected via a signal bus 66. Unit 76, recording layer reproduction signal generation unit 77, fifth control unit 79, sixth control unit 80, guide layer error signal generation unit 82, and guide layer reproduction signal generation unit 83.

  Specifically, the main control unit 67 controls the spindle motor control unit 61 and the feed motor control unit 62 to rotate the optical recording medium 100 at a predetermined number of revolutions and to move the objective lens 34 to the optical recording medium 100. To the position where recording or reproduction is performed.

  The main controller 67 controls the emission and stop of the laser beams 98 and 99 by controlling the recording layer light source 37 and the guide layer light source 47.

  The main control unit 67 is based on an external command and signals received from the recording layer error signal generation unit 76, the recording layer reproduction signal generation unit 77, the guide layer error signal generation unit 82, and the guide layer reproduction signal generation unit 83. Then, the first control unit 71, the second control unit 72, the third control unit 73, the fifth control unit 79, and the sixth control unit 80 are controlled to focus and track the laser beams 98 and 99.

  The main control unit 67 includes a storage unit 67a in which information of the optical recording medium 100 received by the light receiving elements 42 and 52 can be stored. The storage unit 67a stores a threshold value that is an intensity distribution of the laser beam 99 received by the light receiving element 42 in a normal state.

  Specifically, for example, as shown in FIG. 4, the storage unit 67 a is along the optical axis C, which is irradiated to the guide track 200 of any one layer of the guide layer group 111 of the normal optical recording medium 100. The intensity distribution of the laser beam 99 when the reflected light of the laser beam 99 is received by the light receiving element 52 is stored as a threshold value of the normal intensity distribution. The normal intensity distribution is, for example, a distribution in which the intensity distribution of the laser beam 99 is symmetric with respect to the optical axis C.

The main control unit 67 has the following functions (1) to (4).
(1) A function of adjusting the two laser beams 98a and 98b to the same width as the recording track 201.

  (2) A function of determining the inclination of the laser beam 99 reflected by any layer of the guide layer group 111.

  (3) A function of detecting information recorded in any layer of the recording layer group 112 and causing the laser beam 99 to follow the guide track 200 corresponding to the recording track to be recorded next.

  (4) A function of correcting the laser beam 99.

  Next, these functions (1) to (4) will be described. The first guide layer 121 (hereinafter referred to as guide layer 121) is used as one of the layers in the guide layer group 111, and the tenth recording layer 140 (hereinafter referred to as recording layer 140) is used as one of the layers in the recording layer group 112. ) Will be described below.

  As shown in FIG. 4, the function (1) is a light beam of two laser beams 98a and 98b that are divided by the diffraction grating 43 and irradiated onto the recording track 201 adjacent in the radial direction (track direction) of the recording layer 140. This is a function of adjusting the radial width H between the spots 298 a and 298 b to be substantially the same as the width between the recording tracks 201 of each layer of the recording layer group 112. For example, the radial width H between the light beam spots 298a and 298b is obtained by rotating the diffraction grating 43 based on the signals of the two laser beams 98a and 98b reflected by the recording track 201 and received by the light receiving element 42. It is adjusted with.

  Function (2) detects the intensity distribution of the laser beam 99 received by the light receiving element 52 from the laser beam 99 reflected by the guide track 200 of the guide layer 121, and the detected intensity distribution is stored in the storage unit 67a. This is a function for determining the inclination of the laser beam 99 with respect to the optical axis C by comparison with a normal intensity distribution threshold.

  Specifically, for example, when the objective lens 34 is moved to irradiate the guide track of the guide layer 121 with the laser beam 99, the intensity distribution of the laser beam 99 received by the light receiving element 52 is changed to the optical axis as shown in FIG. There is a case where it is not distributed symmetrically with respect to C and shifts in one direction.

  Thus, when the intensity distribution of the laser beam 99 received by the light receiving element 52 is shifted, the irradiation direction of the laser beam 99 from the objective lens 34 to the light beam spot 299 is inclined with respect to the optical axis C, and the light beam The relationship between the irradiation positions of the spots 298a and 299 is different from the target irradiation position. Further, as shown in FIG. 6, a so-called lens in which a line D (hereinafter referred to as “continuous line”) D connecting the laser beam 98a and the light beam spots 298a and 299 of the laser beam 99 is inclined with respect to a predetermined optical axis C. A shift occurs.

  Function (2) compares the intensity distribution of the laser beam 99 received by the light receiving element 52 with the threshold value stored in the storage unit 67a, and when the intensity distribution of the laser beam 99 is out of the threshold range, This is a function for determining that the laser beam 99 is tilted with respect to the optical axis C, that is, the continuous line D of the laser beams 98 and 99 is tilted with respect to the optical axis C.

  Function (3) is that the light beam spot 299 of the laser beam 99 is applied to the guide track 200 corresponding to the unrecorded recording track 201 in which the information adjacent to the recording track 201 recorded in the recording layer 140 in the radial direction is not recorded. It is a function to irradiate.

  Specifically, the light beam spot 298b of one of the two laser beams 98a and 98b whose width H is adjusted by the function (1) is caused to follow the recording track 201 on which information is recorded. Next, the guide track 200 corresponding to the unrecorded recording track 201 adjacent to the recorded recording track 201 in the radial direction is irradiated with the light beam spot 298b in a state of following the recorded recording track 201.

  If the light beam spot 299 cannot be irradiated onto the guide track 200 in a state where the continuous line D of the light beam spots 298a and 299 is along the optical axis C, it is reflected by the guide track 200 received by the light receiving element 52. Further, the objective lens 34 and the guide layer lens 54 are controlled so that the intensity distribution of the laser beam 99 is an asymmetric intensity distribution with respect to the optical axis C from the threshold range.

  As a result, as shown in FIG. 6, a lens shift that inclines the continuous line D with respect to the optical axis C is generated, and the state in which the laser beam 98b follows the recorded recording track 201 is maintained. The light beam spot 299 of the laser beam 99 is caused to follow the guide track 200 corresponding to the unrecorded recording track 201 adjacent to the recorded recording track 201 in the radial direction.

  As described above, the function (3) increases the inclination angle of the continuous line D with respect to the optical axis C as shown in FIG. 6 by intentionally shifting the intensity distribution of the laser light 99 from the range of the threshold value. The laser beam 99 follows the guide track 200 corresponding to the recording track 201 to be recorded next in a state where the laser beam 98b follows the recorded recording track 201.

  The function (4) is a function for correcting the laser light 99 and controlling the intensity distribution of the laser light 99 received by the light receiving element 52. Specifically, when the function (2) determines that the tilt of the laser beam 99 has occurred, the objective lens 34 and the guide layer lens 54 are controlled, and the light beam spot 299 of the laser beam 99 is guided to a predetermined guide. The state in which the track is irradiated is maintained, and the intensity distribution of the laser beam 99 is set within the threshold range as shown in FIG.

  Thus, by setting the intensity distribution of the laser beam 99 within the threshold value range, as shown in FIG. 7, the inclination angle of the continuous line D with respect to the optical axis C is reduced, and as a result, the lens shift is reduced.

  As described above, the function (4) corrects the intensity distribution of the laser beam 99 to the threshold range as described above, thereby extending the continuous line D of the light beam spots 298a and 299 of the laser beams 98b and 99. Is corrected to approximate the optical axis C.

(Recording method of optical recording medium 100)
Next, a reproducing / recording method of the optical recording medium 100 configured as described above will be described with reference to FIGS. 9 to 11, a two-dot chain line connecting the guide track 200 and the recorded and unrecorded recording tracks 201 indicates the positions of the guide track 200 and the recording track 201 along the optical axis C for convenience. This is an imaginary line written parallel to the optical axis C.

  First, as a function (1), the main control unit 67 performs the width of the light beam spots 298a and 298b of the laser beams 98a and 98b obtained by dividing the laser beam 98 emitted from the recording layer light source 37 into two by the diffraction grating 43. H is adjusted to substantially the same width as the recording track width of the recording layer 140 (step ST11).

  Next, as shown in FIG. 9, the main control unit 67 detects information already recorded on the recording track 201 of the recording layer 140 with the laser beam 98b (step ST12). Next, as a function (3), the main control unit 67, as shown in FIG. 9, guides the guide layer 121 corresponding to the recording track 201 that records information adjacent to the detected recording track 201 in the radial direction. The track 200 is irradiated with the light beam spot 299 of the laser beam 99 (step ST13).

  Next, as a function (2), the main controller 67 receives the reflected light of the irradiated laser beam 99 by the light receiving element 52 and detects the inclination of the laser beam 99 received by the light receiving element 52 (step ST14). . Specifically, the main control unit 67 compares the intensity distribution of the laser beam 99 received by the light receiving element 52 with the threshold value stored in the storage unit 67a.

  If the intensity distribution of the laser beam 99 received by the light receiving element 52 is out of the threshold range, it is determined that the laser beam 99 is tilted (NO in step ST14). That is, the main control unit 67 determines that a lens shift in which the continuous line D connecting the laser beam 98a and the light beam spots 298a and 299a of the laser beam 99 is inclined with respect to the optical axis C has occurred.

  For this reason, the main control unit 67 has a radial width between the light beam spots 298b and 299 different from the width H between the light beam spots 298a and 298b. It is determined that the widths between the recording tracks 201 are different. That is, the main control unit 67 does not record the recording track 201 on which information has already been recorded on the extension along the optical axis C through the guide track 200 as shown in FIG. It is determined that there is a possibility that information is overwritten on the recording track 201.

  Next, the main control unit 67 corrects the position of the light beam spot 298a of the laser beam 98a when recording information on the recording track 201 with the laser beam 98a (step ST15). Specifically, the main control unit 67 controls the guide layer lens 54 as function (4) to correct the tilt of the laser beam 99. Accordingly, the main control unit 67 approximates the inclination angle of the continuous line D of the light beam spots 298a and 299 to the optical axis C in a state where the light beam spot 299 is irradiated on the guide track 200. As a result, as shown in FIG. 10, recording is performed on the recording track 201 by the laser beam 98a so that the light beam spot 298a of the laser beam 98a irradiates the recording track 201 extending along the optical axis C from the guide track 200. Position is corrected.

  Next, the main control unit 67 records information on the recording track (step ST16). When the recording of all necessary information is completed through these steps (YES in step ST17), the main control unit 67 ends the recording on the optical recording medium 100. If the recording of necessary information is not completed (NO in step ST17), the process returns to step ST12 again, and as shown in FIG. 11, the already recorded recording track 201 is detected (step ST12). Thereafter, the same process is repeated until all recording is completed (YES in step ST17).

  Further, the inclination of the laser beam 99 received by the light receiving element 52 is detected (step ST14), and when the intensity distribution of the received laser beam 99 is within the threshold range, the laser beam 99 is along the optical axis C. Therefore, it is determined that there is no tilt and recording is possible normally (NO in step ST14).

  If the laser beam 99 is normal, the main control unit 67 does not perform correction, records information on the recording track (step ST16), and completes recording (YES in step ST17) until step ST12. The subsequent steps are repeated.

  According to the reproducing / recording apparatus 1 configured as described above, even if the optical recording medium 100 is deformed, such as warping, the deformation is detected from the laser beams 98b and 99 that irradiate the guide track 200 and the recording track 201. It becomes possible to detect.

  Further, even if the optical recording medium 100 is deformed, the reproducing / recording apparatus 1 has a continuous line D of the light beam spots 298a and 299 of the laser beams 98a and 99 with respect to the guide track at a predetermined position. Correction is performed along C, and information is recorded on the recording track 201 corresponding to the guide track 200. As a result, recording can be performed on the recording track 201 corresponding to the guide track 200 along the predetermined optical axis C of the reproduction recording apparatus 1 regardless of the deformation of the optical recording medium 100, and the already recorded information is overwritten. Thus, overwriting on the recorded area of the recording track 201 can be prevented, for example, when information is recorded.

  As described above, according to the reproducing / recording apparatus 1 and the reproducing / recording method of the optical recording medium 100 according to the present embodiment, even if the optical recording medium 100 is deformed, the guide track 200 is supported along the optical axis C. Recording can be performed on the recording track 201 to be performed, and overwriting on the recorded area can be avoided.

  Note that the optical recording medium 100, the reproducing / recording apparatus 1, and the reproducing / recording method of the optical recording medium 100 of the present embodiment are not limited to the above-described configuration. For example, in the above-described example, the optical recording medium 100 has been described as having the configuration including the guide layer group 111 having the plurality of guide layers 121 and 122 and the recording layer group 112 having the plurality of recording layers 131 to 140. Not.

  For example, the optical recording medium 100 may be configured to have only a single guide layer. Further, for example, the optical recording medium 100 is a so-called bulk type that performs multi-layer recording in a recording layer by changing the position of a light beam spot in the focusing control direction if a single layer or a plurality of recording layers can be formed. Or other similar optical recording media. However, in the above-described reproducing / recording apparatus 1 and reproducing / recording method, the longer the distance between the guide layer and the recording layer, the greater the deviation of the light beam spot due to the inclination thereof. The optical recording medium 100 is more effective.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Playback recording apparatus, 3 ... Rotation drive part, 4 ... Optical apparatus, 5 ... Control apparatus, 21 ... Feeding apparatus, 22 ... Objective lens apparatus, 23 ... Recording layer optical apparatus, 24 ... Guide layer optical apparatus, 25 ... Dichroic Mirror, 31 ... support, 32 ... feed motor, 34 ... objective lens, 37 ... recording layer light source, 38 ... collimator lens, 39 ... polarizing beam splitter, 40 ... recording layer lens device, 42 ... light receiving element, 43 ... diffraction grating 44 ... Recording layer lens, 47 ... Guide layer light source, 50 ... Guide layer lens device, 52 ... Light receiving element, 54 ... Guide layer lens, 67 ... Main control unit (control unit), 67a ... Storage unit, 98 ... Laser light 98a ... Laser beam (first laser beam), 98b ... Laser beam (second laser beam), 99 ... Laser beam (third laser beam), 100 ... Optical recording medium, 101 ... Clamp portion, 101a ... Hole portion DESCRIPTION OF SYMBOLS 102 ... Recording area | region, 110 ... Board | substrate, 111 ... Guide layer group, 112 ... Recording layer group, 113 ... Cover layer, 121, 122 ... Guide layer, 131-140 ... Guide layer, 200 ... Guide track, 201 ... Recording track, 298a. 298b ... light beam spot, 299 ... light beam spot, C ... optical axis.

Claims (6)

A substrate, a guide layer provided on the substrate, in which position information in a radial direction is recorded, and a rotation driving unit that rotates an optical recording medium provided on the substrate and having a recording layer capable of recording information;
An objective lens facing the optical recording medium that is rotated by the rotation driving unit, a drive unit that drives the objective lens to an arbitrary position in the radial direction, a recording layer light source that emits a laser beam applied to the recording layer, A diffraction grating that divides the laser light emitted from the recording layer light source into a first laser light and a second laser light, and a guide layer that emits a third laser light having a wavelength different from that of the laser light emitted from the recording layer light source. A light source, a light receiving element that receives the first laser light, the second laser light, and the third laser light reflected by the recording layer and the guide layer; and the first laser light, the second laser light, and The third laser beam is guided to the objective lens and the light receiving element, and focusing and tracking of the first laser beam, the second laser beam, and the third laser beam are performed. An optical device having a capability lens apparatus,
A storage unit in which the intensity distribution of normal third laser light received by the light receiving element is stored as a threshold;
Adjusting the radial interval of the optical recording medium between the light beam spots of the first laser beam and the second laser beam to be the same as the radial interval of the optical recording medium of the recording track of the recording layer; When the first laser beam, the second laser beam, or the third laser beam is caused to follow the recording layer or the guide layer, the first laser beam reflected by the guide layer received by the light receiving element is reflected. A control unit that compares the intensity distribution of the three laser beams with the threshold and detects the inclination of the third laser beam with respect to the optical axis;
A reproducing and recording apparatus comprising: The controller is
Irradiating the recording track on which the information of the recording layer is recorded with the second laser beam;
The guide layer corresponding to the recording track for recording information adjacent in the radial direction of the recording track on which the information is recorded while maintaining the state in which the recording laser on which the information is recorded is irradiated with the second laser light Irradiating the third laser beam to the guide track of
The reproducing / recording apparatus according to claim 1. The controller is
An intensity distribution of the third laser beam reflected by the guide layer is maintained while maintaining a state in which the guide track of the guide layer corresponding to the recording track for recording the information is irradiated with the third laser beam. Compared to the threshold,
When the third laser light is tilted with respect to the optical axis, the intensity distribution of the third laser light received by the light receiving element is corrected to the threshold value range,
Recording the information on the recording track for recording the information with the first laser light after correcting the intensity distribution of the third laser light received by the light receiving element within the threshold range;
The reproducing / recording apparatus according to claim 2. A guide layer in which radial position information is recorded provided on the substrate, and an optical recording medium provided on the substrate and having a recording layer capable of recording information are rotated by a rotation drive unit;
Driving an objective lens facing the optical recording medium rotated by the rotation driving unit to an arbitrary position in the radial direction by a driving unit;
Splitting the laser beam emitted from the recording layer light source to the recording layer into a first laser beam and a second laser beam by a diffraction grating;
Emitting a third laser beam emitted from a guide layer light source and having a wavelength different from that of the laser beam emitted from the recording layer light source;
The radial distance of the optical recording medium between the light beam spots of the first laser light and the second laser light is adjusted to be the same as the radial distance of the recording track of the recording layer of the optical recording medium. ,
When the first laser beam, the second laser beam, or the third laser beam is caused to follow the recording layer or the guide layer, the third laser beam reflected by the guide layer received by a light receiving element. The control unit compares the intensity distribution of the laser beam with the threshold value of the intensity distribution of the normal third laser beam received by the light receiving element stored in the storage unit, and determines the inclination of the third laser beam with respect to the optical axis. Detecting,
A method for reproducing and recording an optical storage medium. Irradiating the recording track on which the information of the recording layer is recorded with the second laser beam;
The guide layer corresponding to the recording track for recording information adjacent in the radial direction of the recording track on which the information is recorded while maintaining the state in which the recording laser on which the information is recorded is irradiated with the second laser light Irradiating the guide track of the third laser beam,
The method for reproducing and recording an optical storage medium according to claim 4. An intensity distribution of the third laser beam reflected by the guide layer is maintained while maintaining a state in which the guide track of the guide layer corresponding to the recording track for recording the information is irradiated with the third laser beam. Comparing to a threshold,
Correcting the intensity distribution of the third laser beam received by the light receiving element when the third laser beam is tilted with respect to the optical axis, to the threshold range;
Recording the information on the recording track for recording the information with the first laser light after correcting the intensity distribution of the third laser light received by the light receiving element within the threshold range;
The method of reproducing and recording an optical storage medium according to claim 5.

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