JP2005293820A - Optical recording medium, method for manufacturing the same,recording/playback method, and recording/playback apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical recording medium that allows information to be recorded and played back properly, even when a type of recording medium in which information is recorded to grooves is used along with a type of recording medium in which information is recorded to lands, as well as a method for recording and playback with this medium. <P>SOLUTION: Recording track information is recorded in the medium in advance, indicating whether information is to be recorded in the grooves or the lands, whichever of the grooves and lands is best suited to the recording of the information is selected on the basis of the recorded track information that is read out, and the recording or playback of the information is performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical recording medium having a recording layer for recording / reproducing information by irradiation with a laser beam or the like, a manufacturing method thereof, a recording / reproducing method thereof, and a recording / reproducing apparatus.

  Optical recording media are attracting attention as large-capacity, high-density memories. As such media, there are an erasable type capable of rewriting information and a write-once type capable of recording information only once. Furthermore, as one of the erasable optical recording media, a thin film that changes phase between an amorphous state and a crystalline state is formed on a substrate as a recording layer, and information can be recorded and erased by thermal energy by laser light irradiation. There is something to do.

  As a phase change material for the recording layer, an alloy film mainly containing Ge, Sb, Te, In, or the like, for example, a GeSbTe alloy is known. Information recording is performed by forming a mark by partially amorphizing the recording layer. Conversely, erasing is performed by crystallizing the amorphous mark. Amorphization is performed by heating the recording layer to the melting point or higher and then cooling it at a speed equal to or higher than a certain value. On the other hand, crystallization is performed by heating the recording layer to a temperature not lower than the crystallization temperature and not higher than the melting point. Information reproduction is performed using the difference in reflectance between the amorphous mark and the crystal region.

  Generally, spiral or concentric guide grooves (grooves) for tracking laser light during recording / reproduction are previously provided on the substrate. An area between the grooves is called a land, and only one of the groove and the land is used as an information track for recording information, and the other is used as a guard band for separating adjacent information tracks. . For example, in Blu-ray Disc, information is recorded in a groove portion of an information track close to the laser light irradiation surface (see, for example, Non-Patent Document 1).

  An example of an optical recording medium for recording information in such a conventional groove part is shown in FIG. In FIG. 7, an optical recording medium 701 is provided with a recording layer on a transparent substrate having a thickness of 1.1 mm made of polycarbonate and provided with a central hole 702 for mounting in a recording / reproducing apparatus. A structure having a protective layer of 1 mm, information is recorded / reproduced by irradiating laser light through the protective layer. The substrate is provided with a guide groove for tracking laser light during recording / reproduction. The optical recording medium 701 has a read-only lead-in area 704, a test recording area 705 for performing a learning operation for obtaining an optimum pulse condition, and an information recording area 706 for recording information.

More recently, the amount of information handled has increased with the improvement of the processing capabilities of various information devices. Therefore, a cheaper and higher density recording medium is required. As an example of such a recording medium, there is a write-once recording medium using an organic dye film formed by a spin coating method as a recording layer.
Nikkei Business Publications, Next-generation optical disc dismantling new book, P29, Fig. 6

  FIG. 4A shows a cross-sectional view of the main part in the radial direction of the write-once recording medium, and FIG. 4B shows an example of forming a recording layer by spin coating. The recording medium 401 has a structure in which a recording layer 433 is formed on a substrate 436 having a thickness of 1.1 mm provided with an information track, and a transparent protective layer 432 having a thickness of 0.1 mm is provided on the recording layer 433. Laser light 410 is irradiated through the layer 432 to record / reproduce information. The recording layer 433 is formed by applying the organic dye 449 on the substrate 436 while rotating the substrate 436 installed on the turntable 448.

Here, since the recording layer 433 is thick at the concave land portion 445 and thin at the convex groove portion 446 in the information track, sufficient signal quality cannot be obtained when information is recorded in the groove portion 446. .
Therefore, it is conceivable to record information in the concave land portion 445 to improve the signal quality. However, when a recording medium for recording information in the groove portion 446 and a medium for recording information in the land portion 445 coexist, there is a problem that it is difficult to cope with the recording / reproducing apparatus.

  The present invention solves the above-described conventional problems, and an optical recording medium capable of recording / reproducing information with good signal quality, a manufacturing method thereof, a recording / reproducing method, and a recording / reproducing for different types of recording media. An object is to provide an apparatus.

  In order to achieve the above object, the optical recording medium of the present invention records and reproduces information by irradiating a laser beam on a disk-shaped substrate having an information track comprising a guide groove for tracking the laser beam. An optical recording medium having a recording layer, in which recording track information indicating whether information is recorded in a groove portion near the laser light irradiation surface or a land portion far from the laser light irradiation surface in the information track is recorded in advance. It is characterized by.

Accordingly, it is possible to record / reproduce information with good signal quality by reading the recording track information at the time of use and selecting the groove portion or the land portion.
In order to achieve the above object, the optical recording medium of the present invention is characterized in that recording track information indicating that information is recorded on a land portion far from the laser light irradiation surface in the information track is recorded in advance.

As a result, it is possible to read / write information with good signal quality by reading the recording track information during use and selecting the land portion far from the laser light irradiation surface where the recording layer is thick. .
Furthermore, the optical recording medium of the present invention is characterized in that tracking control is not required when reading the recording track information, and may include an identification information area for recording the recording track information. The recording track information is preferably recorded in the form of a bar code that is a set of radial lines. This facilitates the creation of the substrate and the control of the recording / reproducing apparatus.

Alternatively, the optical recording medium of the present invention may include a read-only lead-in area for recording recording track information. The recording track information is preferably recorded in the lead-in area by wobbling the guide groove in the radial direction.
This makes it possible to record the recording track information on an optical recording medium that does not have an identification information area.

The optical recording medium of the present invention may have a plurality of recording layers.
This makes it possible to create a higher-density recording medium.
The recording layer of the optical recording medium of the present invention is preferably formed by spin coating. Further, it is preferably made of an organic dye-based recording material.

Thereby, a recording medium can be created at low cost.
The recording method of the optical recording medium of the present invention is a recording method for recording information by irradiating the optical recording medium with a laser beam, and reads the recording track information recorded on the optical recording medium and records it. Based on the track information, it is determined whether the information is recorded in the groove portion or the land portion, and the information is recorded based on the determination.

  The optical recording medium reproducing method of the present invention is a reproducing method for reproducing recorded information by irradiating a laser beam to the optical recording medium, wherein the recording track information recorded on the optical recording medium is recorded. Based on the read and recorded track information, it is determined whether the information is recorded in the groove portion or the land portion, and the information is reproduced based on the determination.

  Thus, it is possible to record / reproduce information with good signal quality by reading the recording track information at the time of use and selecting the groove portion or the land portion.

  According to the optical recording medium, the manufacturing method, the recording / reproducing method, and the recording / reproducing apparatus of the present invention, either one of the groove part and the land part suitable for information recording is selected according to the type of the recording medium. It is possible to select and record / reproduce information with good signal quality.

Hereinafter, an optical recording medium, a manufacturing method thereof, a recording / reproducing method, and a recording / reproducing apparatus according to the present invention will be described with reference to the drawings.
(Embodiment 1)
Here, the optical recording medium of the present invention will be described with specific examples. The recording medium in the present embodiment records and reproduces information by irradiating laser light with a wavelength of about 405 nm, which is mainly collected by an objective lens with an NA of about 0.85.

(Example 1)
In FIG. 1, in the first embodiment, recording track information indicating whether information is recorded in the groove portion or the land portion in the information track, or recording in the land portion, is recorded in a barcode form in the identification information area. The optical recording medium 101 is shown.

  The optical recording medium 101 includes a central hole 102 having a diameter of 15 mm for mounting in a recording / reproducing apparatus, a recording layer on a transparent substrate made of polycarbonate having a diameter of 120 mm and a thickness of 1.1 mm, and further having a thickness. It has a structure with a protective layer with a thickness of 0.1 mm. Information is recorded / reproduced by irradiating a laser beam through the protective layer from the surface opposite to the substrate. The recording layer is made of a GeSbTe alloy or an organic dye, which is a phase change recording material, and a recording mark is formed on the recording layer by irradiation with laser light.

  The optical recording medium 101 includes an identification information area 103 for recording identification information of a recording medium provided at a radius of about 21 mm to 22 mm, and a read-only lead-in provided at a radius of about 22 mm to 23 mm. An area 104, a test recording area 105 for performing a learning operation for obtaining an optimum pulse condition, provided at a radius of about 23 mm to 24 mm, and an information recording for recording information provided at a radius of about 24 mm to 58 mm A region 106 is included.

  The test recording area 105 and the information recording area 106 are provided with information tracks 107 that are configured by grooves having a track pitch of about 0.32 μm and that track laser light during recording / reproduction. In the identification information area 103, recording track information indicating whether information is recorded in a groove portion near the laser light irradiation surface or a land portion far from the laser light irradiation surface in the information track 107, or recording on the land portion is recorded. , Recorded in the form of a bar code that is a set of radial lines. In the lead-in area 104, a read-only information is recorded by wobbling a groove having a track pitch of about 0.35 μm in the radial direction and modulating the spatial frequency.

  FIG. 8 is a plan view of the main part of the track shape of the lead-in area 104. The laser beam 810 tracked by the track 811 is scanned in the direction of the arrow 812. The track 811 meanders in the radial direction and contains important information on its spatial frequency. Therefore, a track pitch larger than that of the information recording area 106 is set for the purpose of reducing crosstalk with adjacent tracks and increasing the reliability of information to be reproduced. Further, the information track 107 in the test recording area 105 and the information recording area 106 is subjected to constant frequency modulation, wobbled in the radial direction to record address information, and based on a signal obtained from this wobble. Controls the rotation of the spindle motor of the recording / reproducing device.

  With the above configuration, the optical recording medium 101 according to the present invention reads out the recording track information at the time of use and selects either the groove portion or the land portion, thereby recording / reproducing information with good signal quality. It becomes possible. Furthermore, since the recording track information is recorded in the form of a barcode, it is possible to read the recording track information without performing tracking control only by focusing the laser beam on the recording layer while rotating the recording medium. . Accordingly, the information in the lead-in area 104 may be recorded in either the groove part or the land part, and the same groove part as that in the information recording area 106 can be used, so that the substrate creation and the control of the recording / reproducing apparatus are facilitated.

  Specifically, in a recording medium of a type that records in the groove portion, the groove portion is wobbled to form an information track 107, and tracking to the groove portion makes it possible to read reproduction-only information and address information. Further, in a recording medium of a type for recording in the land portion, the land portion is wobbled to form the information track 107, and laser light is tracked to the land portion so that read-only information and address information can be read. Therefore, according to the recording medium of the present invention, the recording track information is read, and it is determined in which of the groove part and the land part whether the reproduction-only information or the address information is recorded. Even a recording type recording medium can record or reproduce information with good signal quality.

  In particular, the effect of the present invention becomes remarkable when the recording performance differs between the groove portion and the land portion, such as when a recording layer made of an organic dye-based recording material is formed by a spin coating method. For example, recording track information indicating that information is to be recorded on a land portion suitable for information recording may be recorded in advance.

  Note that the recording of the identification information area 103 can be performed by partially erasing, deforming, or discoloring the recording film by laser light irradiation. In addition to the recording track information, copyright information, medium individual identification information, and the like may be recorded in the identification information area 103. In the lead-in area 104, recording / reproducing conditions recommended by the manufacturer of the medium may be recorded.

The test recording area may be provided on the outer peripheral side of the information recording area. Further, by providing the test recording areas on both the inner and outer peripheral sides of the information recording area, it is possible to compensate for variations in the recording characteristic distribution depending on the radial position of the recording medium.
(Example 2)
FIG. 2 shows an optical system in which recording track information indicating that information is recorded in a groove portion or a land portion in an information track or recording in a land portion is recorded in the lead-in area in the second embodiment. A recording medium 201 is shown. The optical recording medium in Example 1 described with reference to FIG.

  An optical recording medium 201 is provided with a recording layer on a transparent substrate having a diameter of 120 mm and a thickness of 1.1 mm made of polycarbonate having a central hole 202 having a diameter of 15 mm for mounting in a recording / reproducing apparatus. It has a structure with a protective layer of 0.1 mm. Information is recorded / reproduced by irradiating a laser beam through the protective layer from the surface opposite to the substrate. The recording layer is made of a GeSbTe alloy or an organic dye, which is a phase change recording material, and a recording mark is formed on the recording layer by irradiation with laser light.

  The optical recording medium 201 performs a learning operation for obtaining an optimum pulse condition provided in a read-only lead-in area 204 provided at a radius of about 22 mm to 23 mm and a radius of about 23 mm to 24 mm. A test recording area 205, and an information recording area 206 for recording recording information provided at a radius of about 24 mm to 58 mm.

  The test recording area 205 and the information recording area 206 are provided with information tracks 207 that are configured by grooves having a track pitch of about 0.32 μm and that track laser light during recording / reproduction. The lead-in area 204 wobbles a groove having a track pitch of about 0.35 μm in the radial direction, modulates the spatial frequency thereof, and the groove portion near the laser light irradiation surface in the information track 207 and the laser light irradiation surface. There is provided a medium information track 217 on which recording track information indicating that information is to be recorded in the far land portion or recording in the land portion is provided. The medium information track 217 is wobbled so that the recorded track information can be reproduced when tracking is performed on the groove portion. The information track 207 in the test recording area 205 and the information recording area 206 is subjected to constant frequency modulation, wobbled in the radial direction to record address information, and a recording / reproducing apparatus based on a signal obtained from this wobble Control the rotation of the spindle motor. Here, in a recording medium of a type recorded in the groove portion, an information track is formed by wobbling the groove portion, and reproduction-only information and address information can be read when tracking is performed on the groove portion. In a recording medium of a type that records on the land portion, the land portion is wobbled to form an information track, and when the track is tracked on the land portion, read-only information and address information can be read.

  With the above configuration, the optical recording medium 201 according to the present invention tracks the groove portion of the lead-in area 204 when in use, reads the recording track information, and selects the groove portion or the land portion. Information can be recorded / reproduced with good signal quality regardless of which type of recording medium is recorded on the land portion.

  In the lead-in area 204, recording / reproducing conditions recommended by the manufacturer of the medium may be recorded. The test recording area 205 may be provided on the outer peripheral side of the information recording area 206. Furthermore, by providing the test recording area 205 on both the inner and outer peripheral sides of the information recording area 206, it is possible to compensate for variations in the distribution of recording characteristics depending on the radial position of the recording medium.

(Example 3)
FIG. 3A shows an optical recording medium 301 according to the third embodiment. The optical recording medium 301 has a one-sided two-layer configuration including two recording layers 333 and 335, and irradiates a laser beam 310 from a surface opposite to the substrate through a protective layer 332, and the first recording layer 333 or the first recording layer 333 is formed. By selectively focusing on the two recording layers 335, information is recorded / reproduced on the two recording layers from the same surface side. The recording layers 333 and 335 are separated from each other by a separation layer 334 having a thickness of about 0.03 mm. These layers 333, 334 and 335 are formed of a substrate 336 having a diameter of 120 mm and a thickness of 1.1 mm and a thickness of 0.1 mm. It is sandwiched between a protective layer 332 of 07 mm.

  Details of the recording layer 335 are shown in FIG. As in the first embodiment shown in FIG. 1, the recording layer 335 is provided at a position with a radius of about 21 mm to 22 mm. A read-only area 304 for reproduction, provided at a radius of about 23 mm to 24 mm, a test recording area 305 for performing a learning operation for obtaining an optimum pulse condition, provided at a radius of about 24 mm to 58 mm Information recording area 306 for recording information. The test recording area 305 and the information recording area 306 are formed with grooves having a track pitch of about 0.32 μm and are provided with information tracks 307 for tracking laser light during recording / reproduction. In the identification information area 303, recording track information indicating whether information is recorded in at least the groove portion near the laser light irradiation surface or the land portion far from the laser light irradiation surface in the information track 307, or recording in the land portion. Are recorded in the form of a bar code that is a set of radial lines. In the lead-in area 304, grooves having a track pitch of about 0.35 μm meander (wobble) in the radial direction, and the spatial frequency is modulated to record read-only information.

The first recording layer 333 has the same configuration as the second recording layer 335 except that it does not include the identification information area 303.
In a multilayer recording medium having a plurality of recording layers as in this embodiment and recording / reproducing information on each recording layer from one side, whether to record in the groove portion or in the land portion for each recording layer. By selecting, it becomes possible to use a recording layer material suitable for each recording layer, such as mixing an erasable recording layer and a write-once recording layer, and the present invention is more effective than the case where there is only one recording layer. The effect becomes remarkable.

  Note that the identification information area need only be provided in any one recording layer, but may be provided in both recording layers. Further, the number of recording layers may be three or more. As an example, FIG. 3C shows an optical recording medium 311 having a single-sided four-layer configuration including four recording layers 333, 335, 337, and 338. Except for the four recording layers, the configuration is the same as that of the optical recording medium 301 in FIG.

The specific values of the optical recording medium shape, track radial position, depth, groove width and track pitch shown in Examples 1 to 3 depend on the performance of the recording / reproducing apparatus used and the characteristics of the recording film. It can be set accordingly.
(Embodiment 2)
Here, the recording / reproducing method and recording / reproducing apparatus of the optical recording medium of the present invention will be described.

FIG. 6 is a block diagram schematically showing an example of a recording / reproducing apparatus used for the optical recording medium in the present invention, and shows a state in which the optical recording medium 101 shown in FIG. 1 is mounted.
This recording / reproducing apparatus includes a spindle motor 110 for mounting and rotating a recording medium, a controller 111, a modulator 112 for converting data to be recorded into a recording signal, a laser driving circuit 113 for driving a semiconductor laser in accordance with the recording signal, and a semiconductor laser. An optical head 124 that collects laser light on a medium and records information, obtains a reproduction signal from reflected light, amplifies the reproduction signal, information reproduction signal 114S, focus error signal 114F, tracking error signal A preamplifier 114 for generating 114T, a binarization circuit 115 for converting the information reproduction signal 114S into a binarized signal, a data demodulating circuit 116 for demodulating data from the binarized signal, and testing specific data in a test recording area of the medium Signal quality determiner 117 for determining the quality of the recorded signal, Recording condition storage means 118 for storing the optimum recording conditions obtained by the operation, pulse condition setting means 119 for controlling the laser pulse according to the recording conditions, and recording track information for storing the recording track information read from the optical recording medium 101 The storage unit 122, a focus control circuit 120 that controls the optical head 124 based on the focus error signal 114F so that the laser beam is focused on the recording layer of the optical recording medium 101, and the laser beam tracks the track of the optical recording medium 101. A tracking control circuit 121 for controlling the optical head 124 based on the tracking error signal 114T so as to appropriately scan, and a moving means 123 for moving the optical head 124 in the radial direction of the optical recording medium 101 are provided.

Here, the focus error signal 114F is generated by a general method called an astigmatism method. The tracking error signal 114T is generated by a general method called a push-pull method.
FIG. 5 is a flowchart showing a recording / reproducing method using the recording / reproducing apparatus of FIG. 6, and will be described together with FIG.

  First, in the starting step 501, after the optical recording medium 101 is mounted on the spindle motor 110 and rotated, the optical recording medium 101 is irradiated with information reproducing laser light on the optical recording medium 101 to the recording layer. Focusing is performed, the identification information area 103 on the optical recording medium 101 is accessed, and the recording track information recorded in the identification information area 103 is read out. Reading of the recording track information and the like is performed by the binarization circuit 115 in which the information reproduction signal 114S obtained from the reflected light from the optical recording medium 101 by the optical head 124 is set to a predetermined binarization slice level. The digitized signal is demodulated by the data demodulating circuit 116 and fetched into the controller 111. In this way, the recording track information recorded on the optical recording medium is read out.

Next, in the recording track information storage step 502, the recording track information is stored in the track information storage means 122.
Further, in the read-only information reading step 503, the lead-in area 104 is accessed, the laser beam is tracked to the groove part or land part of the track based on the recording track information, and the medium recorded in the lead-in area 104 is recorded. Read-only information (copyright information, medium identification number, recommended recording conditions, etc.).

  Next, in the learning operation step 504, optimum recording / reproducing conditions are obtained by the following procedure. First, the optical head 124 is moved to access the test recording area 105. The controller 111 sets the pulse condition setting means 119 to a predetermined specific condition or a condition specified by the reproduction-only information of the medium. Next, the specific data output from the controller 111 is converted into a laser drive signal by the modulator 112, and the laser drive circuit 113 drives the semiconductor laser installed in the optical head 124 in accordance with the laser drive signal. The light emitted from the semiconductor laser is condensed on the optical recording medium 101 by the optical head 124, and the laser light is tracked to the groove portion or land portion of the track based on the recording track information. A test signal is recorded in the test recording area 105.

  A signal quality judgment unit 117 measures a jitter value (a fluctuation amount of a reproduced signal position with respect to a reference clock) of a signal obtained by binarizing the reproduction signal of the data recorded in this way by the binarization circuit 115. Then, the signal quality is determined by comparison with a predetermined criterion. If the jitter value satisfies the criterion, the learning operation step 504 ends. When the jitter value does not satisfy the determination criteria, the pulse conditions are sequentially changed to perform test recording of specific data and determination of signal quality of the test recorded data. By repeating this operation until the jitter value satisfies the criterion, the optimum recording condition is obtained.

Next, in the recording / reproducing condition storing step 505, the optimum recording condition obtained by the learning operation step 504 is stored in the recording condition storing means 118.
Finally, in the information recording / reproducing step 506, a pulse condition is set based on the optimum recording condition, a laser beam is tracked on the groove portion or land portion of the track based on the recording track information, and the information is recorded in the information recording area. Record or play back in 106. That is, based on the recording track information, it is determined whether information is recorded in the groove portion or the land portion, and information is recorded / reproduced based on the determination.

  According to the recording / reproducing method of the present invention, with the above configuration, information can be recorded / reproduced with good signal quality by reading the recording track information at the time of use and selecting the groove portion or the land portion. It becomes possible. Furthermore, since the recording track information is recorded in the form of a barcode, it is possible to read the recording track information without performing tracking control only by focusing the laser beam on the recording layer while rotating the recording medium. . Therefore, the information in the lead-in area may be recorded in either the groove part or the land part, and the same groove part as that in the information recording area can be used. Therefore, it is easy to create the substrate and control the recording / reproducing apparatus.

  Specifically, in a recording medium of a type that records in the groove portion, the groove portion is wobbled to form an information track, and laser light is tracked in the groove portion to read reproduction-only information and address information. Further, in a recording medium of a type that records on the land portion, the land portion is wobbled to form an information track, and laser light is tracked on the land portion so that read-only information and address information can be read. Therefore, according to the recording / reproducing apparatus of the present invention, even if both types are mixed, it is possible to correctly select whether to record in the groove part or to record in the land part and to record / reproduce information normally. Become. In particular, the effect of the present invention becomes remarkable when a recording layer having different recording performance at the groove portion and the land portion, such as an organic dye-based recording material formed by spin coating, is used.

  Regardless of whether the information is recorded in the groove portion or the land portion in the information recording area, when the reproduction-only information in the lead-in area is recorded in a predetermined one of the groove portion and the land portion, Track information may be recorded in the lead-in area.

  An optical recording medium, a manufacturing method thereof, a recording / reproducing method, and a recording / reproducing apparatus according to the present invention indicate whether information is recorded in a groove portion or a land portion, or information is recorded in a land portion. By recording the recording track information on the recording medium, one of the groove part and the land part suitable for information recording is selected according to the type of the recording medium, and the information is recorded / recorded with good signal quality. It has the effect of being able to be reproduced, and is useful for large-capacity information recording devices and the like.

The perspective view which shows the optical recording medium in Example 1 of Embodiment 1 of this invention The perspective view which shows the optical recording medium in Example 2 of Embodiment 1 of this invention Sectional drawing and perspective view which show the optical recording medium in Example 3 of Embodiment 1 of this invention Sectional drawing which shows the example of recording layer formation by the conventional optical recording medium and a spin coat method 7 is a flowchart showing a recording / reproducing method for an optical recording medium according to the present invention. 1 is a block diagram showing the configuration of a recording / reproducing apparatus for an optical recording medium according to the present invention. A perspective view showing a conventional optical recording medium The principal part enlarged plan view which shows the optical recording medium in Example 1 of Embodiment 1 of this invention

Explanation of symbols

101, 201, 301, 311 Optical recording medium 102, 202 Center hole 103, 303 Identification information area 104, 204, 304 Lead-in area 105, 205, 305 Test recording area 106, 206, 306 Information recording area 107, 207, 307 Information track 120 Focus control circuit 121 Tracking control circuit 122 Recording track information storage means 123 Moving means 124 Optical head 217 Medium information track 332, 432 Protective layer 333 First recording layer 334 Separation layer 335 Second recording layer 337 Third recording layer 338 Fourth recording layer 336, 436 Substrate 433 Recording layer 445 Land portion 446 Groove portion 310, 410 Laser light 448 Rotary table 449 Organic dye

Claims (17)

An optical recording medium comprising a recording layer on which information is recorded and reproduced by irradiation of laser light on a substrate provided with an information track comprising a guide groove for tracking laser light,
Optical recording characterized in that recording track information indicating whether information is recorded in a groove portion near the laser light irradiation surface or a land portion far from the laser light irradiation surface in the information track is recorded Medium. An optical recording medium comprising a recording layer on which information is recorded and reproduced by irradiation of laser light on a substrate provided with an information track comprising a guide groove for tracking laser light,
An optical recording medium, wherein recording track information indicating that information is recorded on a land portion far from the laser light irradiation surface in the information track is recorded.   3. The optical recording medium according to claim 1, wherein tracking control is not required when reading the recording track information.   4. The optical recording medium according to claim 3, further comprising an identification information area for recording the recording track information.   The optical recording medium according to claim 4, wherein the recording track information is recorded in a bar code shape that is a set of radial lines.   3. The optical recording medium according to claim 1, further comprising a read-only lead-in area for recording the recording track information.   7. The optical recording medium according to claim 6, wherein the recording track information is recorded in the lead-in area by wobbling the guide groove in a radial direction.   The optical recording medium according to any one of claims 1 to 7, wherein the recording layer is irradiated with laser light from a surface opposite to the substrate.   The optical recording medium according to claim 1, comprising a plurality of the recording layers.   The optical recording medium according to claim 1, wherein the recording layer is formed by a spin coating method.   The optical recording medium according to claim 10, wherein the recording layer is made of an organic dye-based recording material. A method for producing an optical recording medium comprising a recording layer on which information is recorded and reproduced by irradiation of laser light on a substrate provided with an information track comprising a guide groove for tracking laser light,
Recording track information indicating which information is recorded in a groove portion near the laser light irradiation surface or a land portion far from the laser light irradiation surface in the information track is recorded. Production method. A method for producing an optical recording medium comprising a recording layer on which information is recorded and reproduced by irradiation of laser light on a substrate having an information track comprising a guide groove for tracking laser light,
A method for manufacturing an optical recording medium, comprising: recording track information indicating that information is recorded on a land portion far from the laser light irradiation surface in the information track. A recording layer on which information is recorded and reproduced by laser light irradiation is provided on a substrate having an information track made up of a guide groove for tracking laser light, and a groove near the laser light irradiation surface in the information track is provided. In an optical recording medium on which recording track information indicating whether to record information on a portion of the head and a land portion far from the laser light irradiation surface is recorded,
Read the recording track information recorded on the optical recording medium,
Based on the recording track information, determine whether to record information in the groove part or land part,
Based on the determination, information is recorded.
Recording method for optical recording medium. A recording layer on which information is recorded and reproduced by laser light irradiation is provided on a substrate having an information track made up of a guide groove for tracking laser light, and a groove near the laser light irradiation surface in the information track is provided. In an optical recording medium on which recording track information indicating whether to record information on a portion of the head and a land portion far from the laser light irradiation surface is recorded,
Read the recording track information recorded on the optical recording medium,
Based on the recording track information, determine whether information is recorded in the groove part or land part,
Based on the determination, information is reproduced.
A method for reproducing an optical recording medium. A recording layer on which information is recorded and reproduced by laser light irradiation is provided on a substrate having an information track made up of a guide groove for tracking laser light, and a groove near the laser light irradiation surface in the information track is provided. A recording apparatus that records information by irradiating a laser beam onto an optical recording medium on which recording track information indicating whether to record information on a recording unit or a land part far from the laser beam irradiation surface is recorded There,
A reading unit for reading the recording track information recorded on the optical recording medium;
A determination unit that determines whether information is recorded in a groove portion or a land portion based on the recording track information;
A recording unit for recording information based on the determination;
An information recording apparatus comprising: A recording layer on which information is recorded and reproduced by laser light irradiation is provided on a substrate having an information track made up of a guide groove for tracking laser light, and a groove near the laser light irradiation surface in the information track is provided. Information reproducing apparatus for reproducing information by irradiating a laser beam onto an optical recording medium on which recording track information indicating which information is to be recorded is recorded on a recording medium or a land portion far from the laser light irradiation surface Because
A reading unit for reading the recording track information recorded on the optical recording medium;
A determination unit that determines whether information is recorded in a groove portion or a land portion based on the recording track information;
Based on the determination, a playback unit that plays back information;
An information reproducing apparatus comprising:

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