JP2010267369A - Optical information recording medium, reproducing device for optical information recording medium, reproducing method for optical information recording medium, and recording/reproducing method for optical information recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information recording medium which allows efficient and stable recording/reproduction even if the reproduction linear velocities are different. <P>SOLUTION: The optical information recording medium is a write-once-read-many type or a rewritable type having a data area in which contents are recorded by forming recording marks having a length equal to or shorter than the optical system resolution limit of a recording and/or reproducing device by a predetermined modulation using first channel bit length as a reference. On the optical information recording medium, a disk management information area, a recording/reproduction lead-in area, and a data area are arranged in this order in the scanning direction of the recording and/or reproducing device. In the disk management information area, disk management information is recorded by a predetermined modulation using a second channel bit length longer than the first channel bit length as a reference. In the recording/reproduction lead-in area and the data area, address information is recorded by a predetermined modulation using the first channel bit length as a reference. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical information recording medium on which information is recorded, an optical information recording medium reproducing apparatus, an optical information recording medium reproducing method, and an optical information recording medium recording / reproducing method.

  In recent years, in order to process an enormous amount of information such as images, there has been a demand for an increase in the information recording density of optical information recording media. One solution is super-resolution reproduction technology. The super-resolution reproduction technique is a technique for reproducing a signal having a mark / space length less than or equal to the optical resolution limit of the reproduction apparatus.

  By using such a super-resolution reproduction technique, recording using a smaller mark / space length becomes possible, and the information recording density is substantially increased. This means that the problem in increasing the density is not the recording technique but the reproduction technique.

  In a high recording density optical information recording medium using the super-resolution reproduction technique described above, the super-resolution effect may increase as the reproduction laser power increases. Therefore, in order to reproduce such an optical information recording medium, The optimum reproducing laser power may be changed from the reproducing laser power for reproducing an optical information recording medium having a low recording density. In the reproduction technique, the clock generation technique is used for controlling the rotation speed of the optical information recording medium, that is, for controlling the rotation servo mechanism and reproducing the signal.

  By the way, there has been proposed an optical information recording medium in which a synchronization signal pattern capable of inserting additional information is inserted, and recorded information can be accurately reproduced using the synchronization signal pattern (for example, Patent Documents). 1).

  In this conventional optical information recording medium, recording marks having different detection signal levels are formed in cells virtually divided at equal intervals on the optical information recording medium in accordance with multilevel data. And the synchronizing signal pattern for extracting the synchronizing signal used when demodulating multilevel data is periodically inserted in the data area. This synchronization signal pattern is encoded by amplitude modulation so as to obtain a reproduction signal waveform that can specify the center of the cell.

  For this reason, a synchronization signal pattern which can store information as redundant data conventionally as additional information by coding amplitude modulation with accurate identification of the cell center, together with multi-value data. By recording, the recorded information can be accurately reproduced and the reduction of the user data area can be suppressed.

  By the way, when one system (for example, CD: Compact Disk) is standardized, various variations (ROM: Read Only Memory, RW: ReWritable, RE: REwritable, RAM) are included in the standard. : Random Access Memory etc.) is also standardized.

  In recent years, various variations such as ROM, RW, RE, RAM and the like have been standardized in standards such as DVD (Digital Versatile Disk) and BD (Blu-ray Disc; registered trademark) for increasing capacity. .

Japanese Patent Laying-Open No. 2005-302260 (released on October 27, 2005)

  In standards such as DVD and BD, there is a demand for a large-capacity optical information recording medium that realizes a high recording density by using a new technology such as a super-resolution technology while maintaining compatibility with a low-density disk. Yes. That is, it is desired that a high recording density medium has a structure that can achieve both recording and reproduction of a low recording density medium and recording and reproduction of a high recording density medium. In general, the channel clock of the reproducing apparatus is a value defined by the standard of optical information recording media such as BD and DVD. Therefore, when recording / reproducing a high recording density optical information recording medium, it is considered that the reproducing apparatus needs to change to a linear velocity different from the disk rotational velocity (linear velocity) of the lower recording density lower-order disk. . It is necessary to switch the rotational speed of the disk of the optical information recording medium, that is, the linear speed. When reproduction shifts from a low recording density region to a high recording density region, the linear velocity must be switched efficiently and stabilized.

  On the other hand, a method of changing the channel clock of the reproducing device according to the recording density of the high recording density optical information recording medium is also conceivable, but the setting of the signal processing device mounted on the reproducing device can be changed, or the signal processing device can be modified. Is necessary, which may increase the manufacturing cost.

  In view of the above problems, an object of the present invention is to provide an optical information recording medium that can be recorded and reproduced efficiently and stably even in optical information recording media having different linear velocities during reproduction, and reproduction of the optical information recording medium. The present invention provides an apparatus, a method for reproducing an optical information recording medium, and a method for recording and reproducing an optical information recording medium.

  In order to achieve the above object, the optical information recording medium according to the present invention has a recording mark including a length less than or equal to the optical system resolution limit of the recording and / or reproducing apparatus with a predetermined length based on the first channel bit length. A data area in which content is recorded by being formed on the basis of the modulation method, and recording and / or content by irradiating the data area with light emitted from the recording and / or reproducing apparatus. A write-once or rewritable optical information recording medium to be reproduced, the disc management information area in which the disc management information related to the optical information recording medium is recorded, and the data area in the recording and / or reproducing apparatus. The recording / reproducing introduction area that can be used for recording / reproducing and the data area are arranged in this order in the scanning direction of the recording / reproducing apparatus. And the disc management information area is formed on the substrate constituting the optical information recording medium based on a predetermined modulation method based on a second channel bit length longer than the first channel bit length. The disc management information is recorded by forming irregularities in the management information area, and the recording / reproducing introduction area and the data area are based on a predetermined modulation method based on the first channel bit length. In addition, by forming irregularities in the recording / reproducing introduction area and the data area on the substrate, it is possible to specify the positions of a plurality of storage locations in the recording / reproducing introduction area and the data area, respectively. It is characterized in that correct address information is recorded.

  In the optical information recording medium of the present invention, the unevenness including the length less than or equal to the optical system resolution limit of the reproducing apparatus constitutes the own medium based on a predetermined modulation method based on the first channel bit length. By being formed at a predetermined position on the substrate, it has a data area in which content is recorded, and light emitted from the playback device is irradiated onto the data area, thereby reproducing the content. A reproduction-only optical information recording medium to be performed, which is a disc management information area in which disc management information relating to the optical information recording medium is recorded, and a recording usable for reproducing the data area by the reproduction apparatus The reproduction introduction area and the data area are arranged in this order in the scanning direction of the reproduction apparatus, and the disk management information area has the first channel bit length. On the basis of a predetermined modulation method based on a longer second channel bit length, irregularities are formed in the disk management information area on the substrate constituting the optical information recording medium, so that the disk management information is The recording / reproducing introduction area is formed with unevenness formed by multiplying the first channel bit length.

  For this reason, even when the disc rotation speed (linear velocity) at the time of reproduction differs between the disc management information area and the data area, the linear velocity is changed while scanning the recording / reproducing introduction area, and Can be stabilized.

  Also, reproduction to the data area can be performed efficiently and stably.

  The recording / reproduction introduction area includes a reproduction use area that can be used when the recording and / or reproduction apparatus reproduces the content recorded in the data area, and a recording mark that is a multiple of the first channel bit length. / It is preferable that a test light region for forming a space row is provided.

  In this case, when the content recorded in the data area is reproduced, it can be efficiently reproduced.

  A pit / space sequence is formed in the recording / reproducing introduction area, and each pit / space length is 3T, 4T, 5T, 6T, 7T, 8T, where T is the first channel bit length. , 9T, 10T, or 11T.

  In this case, the clock can be generated efficiently. This is because at least 2T-long pits formed in the data area are below the optical system resolution limit of the reproducing apparatus, and therefore it is relatively difficult to generate a clock.

  Each pit / space length of the pit / space sequence formed in the recording / reproducing introduction area is any one of 3T, 4T, 5T, 6T, 7T, 8T, 9T, 10T, and 11T. It is preferable that the mark / space sequence having the one mark / space length is repeatedly formed.

  In this case, for the above reason, the clock can be generated efficiently and the process of forming the pit / space sequence can be simplified, so that the cost can be reduced.

  In the recording / reproducing introduction area, it is preferable that a recording mark or a pit / space row for generating a reproduction clock required for reproducing the data area is formed.

  In this case, it is possible to generate a reproduction clock necessary for reproducing the content recorded in the data area, using the recording / reproduction introduction area.

  An optical information recording medium reproducing method according to the present invention is an optical information recording medium reproducing method for reproducing content recorded in the data area of any one of the optical information recording media described above, Alternatively, the light emitted from the reproduction device is irradiated onto the recording / reproducing introduction area, thereby generating a reproduction clock necessary for reproducing the content recorded in the data area.

  In the above-described optical information recording medium reproduction method, data in the data area is reproduced while reproducing the recording / reproducing introduction area between the disk management information area and the data area where information is recorded with reference to different channel bit lengths. A reproduction clock necessary for reproduction can be generated.

  Therefore, reproduction from the disk management information area to the data area can be performed efficiently and stably.

  An optical information recording medium recording and / or reproducing apparatus according to the present invention is an optical information recording medium recording and / or reproducing apparatus that reproduces content recorded in the data area of any one of the above optical information recording media. The light source that emits light and the reproduction that is necessary when the content recorded in the data area is reproduced by irradiating the recording and reproduction introduction area with the light emitted from the light source. And a reproduction clock generation circuit for generating a clock.

  In the recording and / or reproducing apparatus for the optical information recording medium, data is reproduced while reproducing the recording / reproducing introduction area between the disc management information area and the data area where information is recorded with reference to different channel bit lengths. A reproduction clock necessary for reproducing the data in the area can be generated.

  Therefore, reproduction from the disk management information area to the data area can be performed efficiently and stably.

  The optical information recording medium recording / reproducing method according to the present invention records the content in the data area of the optical information recording medium according to any one of the above and the optical information for reproducing the content recorded in the data area. In a recording / reproducing method of a recording medium, a mark and a space string having a recording mark / space length formed by multiplying the first channel bit length are formed in the test write area of the recording / reproducing introduction area.

  In this case, recording / reproduction to / from the data area can be performed efficiently.

  As described above, the optical information recording medium of the present invention has a predetermined modulation method in which a recording mark including a length less than or equal to the optical system resolution limit of the recording and / or reproducing apparatus is based on the first channel bit length. The content area is recorded based on the data area, and the data is recorded and / or reproduced by irradiating the data area with light emitted from the recording and / or reproducing apparatus. A write-once or rewritable optical information recording medium, wherein a disc management information area in which disc management information relating to the optical information recording medium is recorded and the data area are recorded and reproduced by the recording and / or reproducing device The recording / reproducing introduction area and the data area which can be used for the recording and / or reproducing apparatus are arranged in this order in the scanning direction of the recording and / or reproducing apparatus. The disk management information area is stored in the disk management information area on the substrate constituting the optical information recording medium based on a predetermined modulation method based on a second channel bit length longer than the first channel bit length. The disc management information is recorded by forming concavities and convexities, and the recording / reproducing introduction area and the data area are formed on the substrate based on a predetermined modulation method based on the first channel bit length. Address information that can specify each position of a plurality of storage locations in each of the recording / reproducing introduction area and the data area is formed by forming irregularities in each of the recording / reproducing introduction area and the data area. It is recorded.

  Therefore, even in an optical information recording medium having different linear velocities during reproduction, there is an effect that recording and reproduction can be performed efficiently and stably.

It is explanatory drawing for demonstrating the structure of the optical information recording medium in Embodiment 1 and 2 of this invention, (a) is a figure which shows the arrangement configuration of a lead-in area | region, a data area, and a lead-out area | region, (b) ) Is a diagram showing an arrangement configuration of a disc management information area, a recording / reproducing introduction area, and a data area, (c) is a diagram showing a configuration of the disk management information area, and (d) is a diagram showing a recording / reproducing introduction area and a data area. It is a figure which shows a structure. 1 is a block diagram showing a schematic configuration of a reproducing apparatus for an optical information recording medium in Embodiment 1 of the present invention. FIG. It is sectional drawing which shows the structure of the optical information recording medium in Embodiment 2 of this invention. It is explanatory drawing for demonstrating the mark / space row | line | column formed in the optical information recording medium in Embodiment 1 and 2 of this invention. 6 is a flowchart showing a processing procedure of recording and reproducing operations of the reproducing device according to the first and second embodiments of the present invention. It is explanatory drawing for demonstrating operation | movement of the reproduction | regeneration clock generation circuit of the reproducing | regenerating apparatus in Embodiment 2 of this invention (the 1). It is explanatory drawing for demonstrating operation | movement of the reproduction | regeneration clock generation circuit of the reproducing | regenerating apparatus in Embodiment 2 of this invention (the 2). It is explanatory drawing for demonstrating the wobble (meandering) of the groove | channel (groove) formed in the optical information recording medium in Embodiment 1 of this invention. It is a figure which shows the external appearance of the optical information recording medium in Embodiment 1 of this invention. It is an enlarged view of the A section of FIG. It is a block diagram of an ADIP area. It is sectional drawing which shows the structure of the optical information recording medium in Embodiment 1 of this invention. It is a figure which shows the external appearance of the optical information recording medium in Embodiment 2 of this invention. It is an enlarged view of the B section of FIG. It is a figure which shows the external appearance of the comparative example 1 of the optical information recording medium in Embodiment 1 of this invention. It is an enlarged view of the C section of FIG. It is a figure which shows the external appearance of the comparative example 2 of the optical information recording medium in Embodiment 2 of this invention. It is an enlarged view of the D section of FIG. It is a flowchart which shows the process sequence which records the optical information recording medium in Embodiment 1 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. In addition, each figure referred below demonstrates only the main member required in order to demonstrate this invention among the structural members in embodiment of this invention simplified for convenience of explanation. Therefore, the optical information recording medium of the present invention can include arbitrary constituent members not shown in the drawings referred to in this specification. Moreover, the dimension of the member in each figure does not represent the dimension of an actual structural member, the dimension ratio of each member, etc. faithfully. In the following embodiment, the recording / reproducing laser is recorded / reproduced using a laser having a wavelength of about 405 nm.

  The optical information recording medium according to the present application is referred to as an optical information recording medium 100.

(Embodiment 1)
Embodiment 1 of the present invention is an embodiment in which a write-once type optical information recording medium is used. The write-once type optical information recording medium in the first embodiment will be described by taking a large capacity optical information recording medium having a DVD type cross-sectional structure as an example.

  FIG. 9 shows an appearance of the optical information recording medium in the first embodiment. This will be described with reference to FIG. As shown in FIG. 1A, in the optical information recording medium in the first embodiment, the optical information recording medium is reproduced in the scanning direction of the reproducing apparatus of the optical information recording medium for recording or reproducing. A lead-in area, a data area, and a lead-out area are arranged in this order.

  As shown in FIGS. 1B to 1D, the lead-in area is composed of a disc management information area and a recording / reproducing introduction area. Marks (record marks) to be described in the future include pits. The recording / reproducing introduction area includes an area (reproduction utilization area) that can be used for preparation for recording / reproducing the data area.

  In the disc management information area of the optical information recording medium according to the first embodiment, the pit / space has a pit / space length nT1 which is n times (n: integer) the channel bit length T1 (second channel bit length). A column is recorded. The channel bit length T1 is a value defined by a recording format when information is recorded in the disk management information area. The shortest pit / space length nT1 of the pit / space sequence recorded in the disc management information area is less than the optical system resolution limit of the optical information recording medium reproducing apparatus for recording and reproducing this optical information recording medium. Is also set to be long. The optical system resolution limit of the reproducing apparatus here is a value represented by λ / (4NA) where λ is the wavelength of the reproducing laser and NA is the numerical aperture of the objective lens. However, this value is slightly different depending on the playback device.

  In the recording / reproduction introduction area in the first embodiment, for example, a mark / space sequence having a mark / space length mT2 m times (m: integer) the channel bit length T2 (first channel bit length) is recorded. Has been. Further, in the data area in the first embodiment, a mark / space sequence having a mark / space length mT2 m times (m: integer) the channel bit length T2 is recorded.

  The channel bit length T2 is a value defined by the recording format used when recording information in the recording / reproducing introduction area and the data area. For this reason, the shortest mark / space length of the mark / space sequence recorded in each of the recording / reproduction introduction area and the data area is the same mT2. The channel bit length T2 is shorter than the channel bit length T1.

  FIG. 10 is an enlarged view of part A of FIG. 9, and is an enlarged view of the vicinity of the disk management information area of FIG.

  As shown in FIGS. 4 and 10, in the disc management information area of the optical information recording medium of the first embodiment, mark groups (prepit groups) are provided on the substrate constituting the optical information recording medium. Disc management information is recorded by using a pit / space sequence composed of a space group between a pit group and two pits.

  In the disc management information area, the structure of the disc (optical information recording medium), information necessary for recording and reproduction of the disc, and the like are recorded.

  The recording method is based on 8/16 modulation, and the channel bit length T1 adapted to the recording density of the existing optical information recording medium is used as a reference, and the length of each pit and space is a multiple of the channel bit length T1. The length is set to be. Specifically, the length of each pit and space is set to 3T1 or more.

  Note that the length of the shortest pit / space length 3T1 in the pit / space row is set to be longer than the resolution limit of the optical system of the reproducing apparatus. Specifically, the channel bit length T1 was set to 0.133 μm. However, the channel bit length T1 is not limited to this value, and the shortest pit / space length of the pit / space sequence formed on the basis of the channel bit length T1 is the optical system resolution limit λ / It only needs to be longer than (4NA).

  In the disc management information area of FIG. 9, information is recorded by pit / space rows, but is recorded by meandering a groove (groove) on the substrate with reference to the channel bit length T1. Also good.

  Note that the recording method and the like are not limited to those described above, and may be adapted to an existing medium method to be compatible. For example, it may be 1-7 modulation adopted in a Blu-ray disc.

  As shown in FIG. 8, in the recording / reproducing introduction area and the data area, address information is provided in the wobble in which the groove 61 is meandered. This address information is a value representing each position of a plurality of storage locations in each of the recording / reproducing introduction area and the data area. In these, wobbles adapted to a recording density higher than that of an existing write-once recording medium are formed. This wobble is provided with wobbles such that 32T2 is one cycle on the basis of the channel bit length T2 adapted to the density recorded in the data area, for example. More specifically, the address information is embedded in a phase conversion area between a wobble obtained by inverting the phase of a wobble composed of a sine wave by 180 ° and a normal wobble. This area is usually called ADIP. FIG. 11 shows a schematic configuration of this ADIP.

  As shown in FIG. 11, 93 wobbles correspond to 2 sync frames in this ADIP area. Of the 93 wobbles, 8 wobbles are phase conversion units called ADIP. Address information is detected using a wobble signal by a combination of the first four wobbles and the last four wobbles. Furthermore, the rest consists of 85 single wobbles.

  In the recording / reproducing introduction area and the data area, information is recorded by arranging marks and space strings having a length of 3T2 to 11T2 corresponding to multiplication of the channel bit length T2 based on 8/16 modulation. . Also, the length of the shortest mark / space length 3T2 of the mark / space column formed with reference to the channel bit length T2 is set to be shorter than the resolution limit of the optical system of the reproducing apparatus. Specifically, the channel bit length T2 is about 37 nm. However, the channel bit length T2 is not limited to this value, and the shortest mark / space length of the mark / space column formed on the basis of the channel bit length T2 is the optical system resolution limit λ / It only needs to be shorter than (4NA). The track pitch was 0.74 μm.

  Further, the recording method is not limited to the above method, and a recording method adopted in Blu-ray or the like may be used.

  The address information is recorded by wobble in the data area, but may be recorded by providing a mark or a pit / space row on the substrate.

  Next, the structure of the optical information recording medium in Embodiment 1 will be described. FIG. 12 is a cross-sectional view showing the structure of the optical information recording medium in the first embodiment.

  As shown in FIG. 12, the optical information recording medium in the first embodiment includes a first substrate 74, a thin film layer 73, an adhesive layer 72, and a second substrate 71. Recording is performed in this order. It is arranged from the reproduction light incident surface.

  The thin film layer 73 has a multi-layer laminated structure, and includes a super-resolution layer 733 made of zinc oxide, a recording layer 732 made of an organic dye film, and a reflective film 731 made of a silver alloy. .

  The adhesive layer 72 is bonded to the second substrate 71.

  The first substrate 74 and the second substrate 71 are made of polycarbonate resin. In addition, a tracking guide groove (groove) is formed in the first substrate 74. The track pitch was 0.74 μm.

  The optical characteristics of the material constituting the first substrate 74 and the second substrate 71 are not particularly limited, and may be transparent or opaque. Examples of the material constituting the first substrate 74 and the second substrate 71 include glass, polycarbonate, amorphous polyolefin, thermoplastic polyimide, PET, PEN, PES and other thermoplastic transparent resins, thermosetting polyimide, and ultraviolet curable type. Examples thereof include thermosetting transparent resins such as acrylic resins, metals, and the like, and combinations thereof.

  In the first embodiment, a write-once type optical information recording medium has been described as an example, but a rewritable type may be used. In the case of this rewritable type, a phase change material GeSbTe or the like is used as the material of the recording layer 732. If necessary, the phase change material layer can be sandwiched between dielectric layers.

  Further, the first embodiment may be a multilayer disk. The optical information recording medium of the first embodiment has a structure conforming to the DVD type, but may have a structure conforming to the Blu-ray type.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. The second embodiment is an embodiment in which a read-only optical information recording medium is used. As a reproduction-only optical information recording medium in the second embodiment, a large-capacity optical information recording medium having a DVD type cross-sectional structure will be described as an example.

  FIG. 13 shows the appearance of the optical information recording medium in the second embodiment. This will be described with reference to FIG. As shown in FIG. 1A, in the optical information recording medium according to the second embodiment, along the scanning direction of the reproducing device of the optical information recording medium reproduced by the optical information recording medium, The data area and the lead-out area are arranged in this order.

  As shown in FIG. 1B, the lead-in area is composed of a disc management information area and a recording / reproducing introduction area.

  In the disc management information area according to the second embodiment, a pit / space sequence having a pit / space length nT1 which is n times (n: integer) the channel bit length T1 is recorded. The channel bit length T1 is a value defined by a recording format when information is recorded in the disk management information area. The shortest pit / space length nT1 of the pit / space sequence recorded in the disc management information area is longer than the optical system resolution limit of the optical information recording medium reproducing apparatus according to the second embodiment. Is set to The optical system resolution limit of the reproducing apparatus here is a value represented by λ / (4NA) where λ is the wavelength of the reproducing laser and NA is the numerical aperture of the objective lens. However, this value is slightly different depending on the playback device. In the recording / reproducing introduction area of the second embodiment, for example, a pit / space sequence having a pit / space length mT2 m times (m: integer) the channel bit length T2 is recorded. Further, in the data area of the second embodiment, for example, a pit / space sequence having a pit / space length mT2 m times (m: integer) the channel bit length T2 is recorded.

  The channel bit length T2 is a value defined by the recording format used when recording information in the recording / reproducing introduction area and the data area. For this reason, the shortest pit / space length of the pit / space sequence recorded in each of the recording / reproduction introduction area and the data area is the same mT2. The channel bit length T2 is shorter than the channel bit length T1.

  FIG. 14 is an enlarged view of the portion B in FIG. 13, and shows an enlarged view of the vicinity of the disk management information area in FIG.

  As shown in FIGS. 4 and 14, in the disc management information area of the optical information recording medium of the second embodiment, mark groups (pre-pit groups) are provided on the substrate constituting the optical information recording medium. Disc management information is recorded by using a pit / space sequence including a pit group and a space group between two pits. In the disc management information area, the structure of the disc (optical information recording medium), information necessary for reproducing the disc, and the like are recorded.

  The recording method is 8/16 modulation, and the channel bit length T1 adapted to the recording density of the existing optical information recording medium is used as a reference, and the length of each pit and space is a multiple of the channel bit length T1. The length is set to be. Specifically, the length of each pit and space is set to 3T1 or more.

  Note that the length of the shortest pit / space length 3T1 in the pit / space row is set to be longer than the resolution limit of the optical system of the reproducing apparatus. Specifically, the channel bit length T1 was set to 0.133 μm. However, the channel bit length T1 is not limited to this value. The shortest pit / space length of the pit / space sequence formed on the basis of the channel bit length T1 is the optical system resolution limit λ / ( It is sufficient that the length is longer than 4NA).

  Further, the recording method and the like are not limited to the above, and may be adapted to the method of an existing medium that should be compatible. An example is 1-7 modulation used in Blu-ray discs.

  Furthermore, as shown in FIG. 13, in the optical information recording medium in the second embodiment, a recording / reproducing introduction area and a data area are provided. As shown in FIGS. 4 and 14, in these recording / reproduction introduction area and data area, a pit / space sequence having a length of 3T2 to 11T2, which is a multiple of the channel bit length T2, is based on 8/16 modulation. By arranging, information is recorded. In some cases, a repetitive signal of pits / spaces corresponding to any one length of 3T2 to 11T2 may be arranged in the recording / reproducing introduction area. Further, in the case of a medium that requires determination of the reproduction laser power by the test lead (details will be described later), a pit / space sequence having a length of 3T2 to 11T2 is based on 8/16 modulation in the recording / reproduction introduction area. An arrayed test lead area (second area) is also provided.

  Note that the shortest pit / space length 3T2 formed with the channel bit length T2 as a reference is set to be shorter than the resolution limit of the optical system included in the reproducing apparatus. Specifically, the channel bit length T2 is about 37 nm. However, the channel bit length T2 is not limited to this value, and the shortest pit / space length of the pit / space sequence formed with reference to the channel bit length T2 is the optical system resolution limit λ / ( It is sufficient that the length is shorter than 4NA). The track pitch was 0.74 μm.

  Note that the recording method and the like are not limited to those described above, and may be adapted to an existing medium method to be compatible.

  Next, the structure of the optical information recording medium in the second embodiment will be described. FIG. 3 is a cross-sectional view showing the structure of the optical information recording medium in the second embodiment.

  As shown in FIG. 3, the optical information recording medium 100 according to the second embodiment includes a first substrate 41, a thin film layer 42, and a second substrate 43, and in this order from the reproduction light incident surface. Has been placed.

  The thin film layer 42 has a multi-layered structure, and includes a super-resolution layer 421 made of zinc oxide and a reflective film 422 made of a silver alloy.

  The thin film layer 42 is bonded to the first substrate 43 so as to sandwich a protective layer (not shown) and an adhesive layer (not shown).

  The first substrate 41 and the second substrate 43 are made of polycarbonate resin. A pit / space row is formed on the first substrate 41 and / or the second substrate 43.

  The optical characteristics of the material constituting the first substrate 41 and the second substrate 43 are not particularly limited, and may be transparent or opaque. Examples of materials constituting the first substrate 41 and the second substrate 43 include glass, polycarbonate, amorphous polyolefin, thermoplastic polyimide, PET, PEN, PES, and other thermoplastic transparent resins, thermosetting polyimide, and ultraviolet curable. Examples thereof include thermosetting transparent resins such as acrylic resins, metals, and the like, and combinations thereof.

  The optical information recording medium of the second embodiment has a structure conforming to the DVD type, but may have a structure conforming to the Blu-ray type.

  Next, an optical information recording medium reproducing apparatus for reproducing the optical information recording medium in the second embodiment will be described. FIG. 2 is a block diagram showing a schematic configuration of a reproducing apparatus for an optical information recording medium according to the second embodiment. Of course, the reproducing apparatus 200 can record an optical information recording medium by using a known recording technique.

  An optical information recording medium reproducing apparatus 200 according to the second embodiment includes a spindle motor 20, an optical pickup 21, a reproducing clock generation circuit 22, a servo mechanism unit 23, an equalizer 24, and an A / D converter 25. A signal processing circuit 26, an error detection circuit 27, a control unit 28, and a laser control circuit 29.

  In the reproducing apparatus 200, a recording / reproducing laser beam is emitted from the optical pickup 21, and is irradiated onto the recording surface of the optical information recording medium 100 to record or reproduce information. At that time, the return light from the optical information recording medium 100 is received by the optical pickup 21 again.

  The optical pickup 21 photoelectrically converts the return light and outputs the electrical signal to the servo mechanism unit 23.

  The servo mechanism unit 23 performs tracking and focus control of the optical pickup 21 based on the electronic signal from the optical pickup 21.

  The control unit 28 controls the operation of each component of the playback device 200. For example, the control unit 28 is connected to a sensor 30 that detects the rotation state of the optical information recording medium 100. Then, the control unit 28 acquires a detection signal indicating the rotation state of the optical information recording medium 100 from the sensor 30, controls the rotation of the optical information recording medium 100 by the spindle motor 20 based on the detection signal, and records the optical information. The medium 100 is rotated stably.

  The electric signal output from the optical pickup 21 is input to the reproduction clock generation circuit 22 and the equalizer 24. The equalizer 24 equalizes the waveform of the input electrical signal and outputs the waveform-equalized signal to the A / D converter 25.

  The reproduction clock generation circuit 22 generates a reproduction clock using an electrical signal from the optical pickup 21, as will be described later.

  The A / D converter 25 quantizes the electrical signal from the optical pickup 21 using the reproduction clock generated by the reproduction clock generation circuit 22. Then, the A / D converter 25 outputs the quantized signal to the signal processing circuit 26.

  The signal processing circuit 26 performs a predetermined demodulation process on the quantized signal from the A / D converter 25, and then outputs the demodulated signal to the error detection circuit 27. Then, the error detection circuit 27 performs a predetermined error detection process on the demodulated signal from the signal processing circuit 26 and then outputs the signal subjected to the error detection process to the control unit 28.

  The laser control circuit 29 generates a laser drive signal for driving a laser light source (not shown) in the optical pickup 21. The control unit 28 controls the emission state of the laser light emitted from the laser light source in the optical pickup 21 to the optical information recording medium 100 by controlling the generation of the laser drive signal by the laser control circuit 29.

  Next, the operation of the playback apparatus 200 will be described.

  FIG. 5 is a flowchart showing the processing procedure of the reproducing operation of the reproducing apparatus 200. FIG. 5 relates to the reproducing operation of the optical information recording medium reproducing apparatus 200 for reproducing the first and second embodiments.

  As shown in FIG. 2, when the optical information recording medium 100 (Embodiments 1 and 2) is loaded in the reproducing apparatus 200, the sensor 30 detects the situation, and the control unit 28 operates the spindle motor 20 to record the optical information. The medium 100 is rotated. The control unit 28 moves the optical pickup 21 to the disc management information area provided in the lead-in area on the optical information recording medium 100 via the laser control circuit 29. A reproduction clock is generated from pits or wobbles provided in the area, and disc management information (disc type and structure, address information, presence / absence of determination of optimum reproduction laser power by test lead (if present, by test lead) Read the information required to determine the playback laser power)). These pieces of information are recorded in a memory (not shown) in the control unit 28. Based on these pieces of information, it is determined whether or not a test lead is necessary when reproducing the optical information recording medium 100 (step S201). If it is determined in this step S201 that the test lead is not necessary (NO in step S201), the process proceeds to step S202 described later. If it is determined that the test lead is necessary (YES in step S201), the process proceeds to step S206 described later. move on.

  First, when it is determined that the test read is not necessary (NO in step S201), the reproducing device 200 uses the predetermined reproduction condition (for example, linear velocity) suitable for the disk management information area to read the data area from the disk management information. Get the playback conditions necessary for playback. These pieces of information are recorded in a memory (not shown) in the control unit 28. (Step S202).

  Subsequently, the reproducing apparatus 200 moves the optical pickup 21 from the data management information area to the recording / reproducing introduction area. In accordance with the reproduction condition acquired from the disc management information area, the rotation speed of the spindle motor 20 is changed to a rotation speed (linear speed) suitable for the data area. Then, the playback device 200 generates a playback clock from the pits or wobbles formed in the recording / playback introduction area, and stabilizes the linear velocity based on this. Thereafter, an address is acquired from a pit or wobble formed in the disc management information area. (Step S203).

  In the recording / reproducing introduction area of the optical information recording medium 100, marks or pit / space strings for generating a reproduction clock required for reproducing the data area are formed. More specifically, a mark or pit / space sequence having a length of 3T2 to 11T2 is recorded based on 8/16 modulation. In some cases, a mark / space repetitive signal corresponding to any one length of 3T2 to 11T2 may be recorded in the recording / reproducing introduction area. The playback apparatus 200 generates a playback clock from the mark or pit / space string formed in this recording / playback introduction area (step S204). In this step S204, since an accurate and stable reproduction clock is generated, the reproduction apparatus 200 can efficiently reproduce the data area.

  Then, the reproducing apparatus 200 shifts the optical pickup 21 from the recording / reproducing introduction area of the optical information recording medium 100 to the data area, acquires the address using the reproduction clock generated in step S204 above, and acquires the address in the data area. Reproduction is executed efficiently (step S205). Further, it is difficult for the optical pickup 21 of the reproducing apparatus 200 to directly access the starting point of the data area. In this case, for example, if it can be set so that the pickup can be moved so that at least the area including the start point can be accessed, in the second embodiment, when the pickup moves to the inner periphery of the data area, that is, the recording / reproducing introduction area Since a mark or pit for reproducing clock generation is recorded in the recording / reproducing introduction area, the reproducing clock can be generated in step S204 by scanning as it is, and the data area can be reproduced. Even when the optical pickup 21 accesses the area immediately after the start of the data area, since the reproduction clock can be generated in step S204, the optical pickup 21 is immediately moved to the data area start point after the address is acquired, and the data area Can be played.

  On the other hand, in the case of an optical information recording medium having no reproduction introduction area as in Comparative Examples 1 and 2 to be described later, when the optical pickup 21 of the reproduction apparatus 200 accesses before the start of the data area, a reproduction clock is generated. I can't. Therefore, it is necessary to move into the data area and generate a reproduction clock, and then move the optical pickup 21 to the beginning of the data area to reproduce the data area, which is not efficient. In addition, when the optical pickup 21 accesses the area immediately after the start of the data area, after generating a reproduction clock again in the data area, the address is acquired and the optical pickup 21 is returned to the starting point of the data area. Later, the data area must be reproduced, which is not efficient.

  On the other hand, if it is determined in step S201 that the test read is necessary (YES in step S201), the playback device 200 uses the predetermined playback condition (for example, linear velocity) suitable for the disk management information area to manage the disk. In order to perform a test read (determination of the optimum reproduction laser power) using the test read area included in the recording / reproduction introduction area and the reproduction conditions necessary for reproducing the data area from the information to reproduce the data area Test lead conditions necessary for the process are acquired (step S206). These pieces of information are recorded in a memory (not shown) in the control unit 28.

  Subsequently, the reproducing apparatus 200 moves the optical pickup 21 from the data management information area to the recording / reproducing introduction area. Then, the rotation speed of the spindle motor 20 is changed to a rotation speed (linear speed) suitable for the data area in accordance with the reproduction condition acquired from the disk management information area. Then, the playback apparatus 200 generates a playback clock from the pits or wobbles formed in the recording / playback introduction area, and stabilizes the linear velocity based on this. Thereafter, an address is acquired from a pit or wobble formed in the disc management information area. (Step S207).

  In the recording / reproducing introduction area of the optical information recording medium 100, marks or pit / space strings for generating a reproduction clock required for reproducing the data area are formed. More specifically, a mark or pit / space sequence having a length of 3T2 to 11T2 is recorded based on 8/16 modulation. In some cases, a mark / space repetitive signal corresponding to any one length of 3T2 to 11T2 may be recorded in the recording / reproducing introduction area. The playback device 200 generates a playback clock from the mark or pit / space string formed in this recording / playback introduction area (step S208).

  Further, after obtaining the address of the test lead area included in the recording / reproducing introduction area, the reproducing apparatus 200 determines the optimum reproducing laser power for reproducing the data area in the test lead area. In this test area, a mark or pit / space row used for a test lead is provided. More specifically, marks or pit / space rows each having a length of 3T2 to 11T2 are arranged based on 8/16 modulation. Although various methods are assumed for the test lead, the playback apparatus 200 applies a predetermined playback laser power to the optical pickup 21 via the laser control circuit 29 in accordance with the test lead conditions previously read in the disc information area. The optical information recording medium 100 is used for irradiation. The electric signal generated by the optical pickup 21 during reproduction is sent to the reproduction clock generation circuit 22, the equalizer 24, the A / D converter 25, the signal processing circuit 26, and the error detection circuit 27, and the signal quality is measured. Signal quality includes jitter, bit error rate, and the like. The data is recorded in a memory (not shown) in the reproduction data control unit 28.

  Next, the reproducing apparatus 200 varies the reproducing laser power of the optical pickup 21 through a laser control circuit 29 by a predetermined amount. Similarly, signal quality is measured. A series of these test leads is performed a plurality of times, and the reproduction laser power that gives good signal quality is defined as the optimum reproduction laser power for reproducing the contents of the optical information recording medium 100 (step S209).

  Then, when the reproduction of the optical information recording medium 100 shifts from the recording / reproduction degree introduction area to the data area, the reproducing apparatus 200 acquires an address with the reproduction clock generated in the above step S208, and also in the above step S209. The data area is efficiently reproduced using the optimum reproduction laser power determined in (Step S205).

  Note that the modulation method and the like are not limited to those described above, and may be adapted to an existing medium method to be compatible. For example, it may be 1-7 modulation adopted in a Blu-ray disc.

  Next, the operation of the reproduction clock generation circuit 22 of the reproduction apparatus 200 will be described. 6 and 7 are explanatory diagrams for explaining the operation of the reproduction clock generation circuit 22 of the reproduction apparatus 200. FIG. Since generation of the recording clock can be realized in the same manner as generation of the reproduction clock, only generation of the reproduction clock will be described below.

  In FIG. 6, 4T2 out of mT2 longer than the resolution limit of the optical system of the reproducing apparatus 200 out of the shortest mark or pit / space length mT2 of the mark or pit / space row recorded in the recording / reproducing introduction area is 4T for convenience. And In (1) of FIG. 6, the mark or pit / space length 4T is longer than the resolution limit. In this case, when a repetitive signal of the mark / space sequence corresponding to this 4T length is reproduced, As shown in (2), the amplitude of the reproduction signal is sufficiently large.

  Then, when the waveform of the reproduction signal is binarized at the 0 level, a binary signal corresponding to the edge of the mark or space is obtained as shown in (3) of FIG.

  As shown in (4) of FIG. 6, the reproduction clock generation circuit 22 generates a reproduction clock from an edge generated at the rising edge of this signal. The reproduction waveform can be sampled by this reproduction clock, and the data area can be reproduced by using this clock as a reference clock.

  Also, if a test lead is necessary, the next step, signal quality evaluation, can be quickly transferred. That is, the control unit 28 moves the optical pickup 21 to the test area in the recording / reproducing introduction area via the laser control circuit 29. At this time, since the clock generation is completed in the recording / reproducing introduction area, it is possible to promptly shift to the test lead for determining the reproducing laser power necessary for the super-resolution reproduction. That is, it is possible to perform an accurate test lead for determining the optimum reproduction laser power based on the signal quality evaluation from the head cluster.

  On the other hand, it is assumed that the mark / space length is shorter than the resolution limit of the reproducing apparatus 200 as shown in (1) of FIG. In this case, when 2T2 is represented as 2T for convenience, when a repetitive signal of a mark and a space corresponding to the length of 2T is recorded, a super-resolution optical information recording medium is generally reproduced appropriately for each medium. Unless stable super-resolution reproduction is performed with laser power, it becomes difficult to read out signals. In particular, it becomes more difficult to read out signals of marks and spaces below the resolution limit. Therefore, as shown in (2) of FIG. 7, the signal amplitude becomes small. As a result, the reproduction clock generation circuit 22 cannot generate a clock and cannot accurately read out a signal.

  Next, a driving method for recording and reproducing the optical information recording medium in the first embodiment will be described. FIG. 19 is a flowchart showing a processing procedure for recording the optical information recording medium in the first embodiment. However, the common steps shown in FIG. 5 such as the movement of the optical pickup 21 are omitted.

  First, as shown in FIG. 19, a reproduction clock necessary for reproducing the disc management information area is generated by using the mark and pit / spar string in the disc management information area or wobble, and the disc management information area is also used. The type, structure, address, and recording condition of the disc are acquired (step S301).

  Next, the recording medium is moved to the recording / reproducing introduction area, and the rotation speed (linear velocity) of the optical information recording medium is changed based on the information acquired in the disk management information area. A reproduction clock is generated from the pits or wobbles formed in the recording / reproduction introduction area, and the linear velocity of the optical information recording medium is stabilized based on this clock (step S302).

  Subsequently, after obtaining the address, a recording clock for recording the data area is generated using the wobble signal in the recording / reproducing introduction area (step S303).

In addition, a test write area for optimizing the recording laser power and the recording pulse is provided in the recording / reproducing introduction area, and after obtaining the address, based on the recording conditions obtained in the disk management information area first, Test laser light optimization and recording pulse optimization test writing are performed (step S304).
Next, a reproduction clock is generated in the test write area in the recording / reproduction introduction area (step S305).

  Then, the signal quality of the mark string recorded in the recording / reproducing introduction area is evaluated (step S306). If it is NG, the recording condition is changed (step S309), and the process returns to step S303 again.

  On the other hand, if OK, a reproduction clock generation mark / space having a length multiplied by the channel bit length T2 used when reproducing the data area is recorded immediately before the data area in the recording / reproducing introduction area. . More specifically, a mark or pit / space sequence having a length of 3T2 to 11T2 is recorded based on 8/16 modulation. In some cases, a mark / space repetition signal corresponding to any one length of 3T2 to 11T2 may be recorded in the recording / reproducing introduction area (step S307). If the optical information recording medium requires a test lead after this step S307, a mark / space string used for the test lead is recorded continuously after the clock generation mark. Marks or pit / space columns used for test leads are provided. More specifically, a mark or pit / space sequence having a length of 3T2 to 11T2 is recorded based on 8/16 modulation.

  Then, the data area is moved, the address of the data area is acquired using the wobble from the data area, and the data (content information) is recorded in the data area under the recording condition determined in step S306 based on the address. (Step S308).

  Note that the recording method and the like are not limited to those described above, and may be adapted to an existing medium method to be compatible. For example, it may be 1-7 modulation adopted in a Blu-ray disc.

(Comparative Example 1)
Next, Comparative Example 1 for the optical information recording medium of Embodiment 1 will be described.

  FIG. 15 shows the appearance of the optical information recording medium in Comparative Example 1. FIG. 16 is an enlarged view of a portion C in FIG. 15, which is an enlarged view of the vicinity of the disk management information area in FIG.

  The basic structure of the optical information recording medium in Comparative Example 1 is the same as that of the optical information recording medium of the first embodiment, except that the recording / reproducing introduction area of the first embodiment is not provided. ing.

  In the optical information recording medium in Comparative Example 1, since there is no recording / reproducing introduction area in the first embodiment, the linear velocity cannot be changed and stabilized efficiently.

  Further, it is necessary to generate a reproduction clock in the data area at the time of reproduction, and there is a problem that information recorded at the head of the data area is lost.

(Comparative Example 2)
Next, Comparative Example 2 for the optical information recording medium of Embodiment 2 will be described.

  FIG. 17 shows the appearance of the optical information recording medium in Comparative Example 2. FIG. 18 shows an enlarged view of a portion D in FIG. 17, which is an enlarged view of the vicinity of the disk management information area in FIG.

  The basic structure of the optical information recording medium in the second comparative example is the same as that of the optical information recording medium of the second embodiment, except that the recording / reproducing introduction area of the second embodiment is not provided. ing.

  In the optical information recording medium in Comparative Example 2, since there is no recording / reproducing introduction area in the second embodiment, the linear velocity cannot be changed and stabilized efficiently.

  Further, it is necessary to generate a reproduction clock in the data area at the time of reproduction, and there is a problem that information recorded at the head of the data area is lost.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention can be applied to various kinds of optically readable discs such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RW, BD, BD-ROM, magneto-optical disc, phase change disc, etc. The present invention can be applied to an optical information recording medium and an optical information recording medium reproducing apparatus.

DESCRIPTION OF SYMBOLS 20 Spindle motor 21 Optical pick-up 22 Reproduction | regeneration clock generation circuit 23 Servo mechanism part 24 Equalizer 25 A / D converter 26 Signal processing circuit 27 Error detection circuit 28 Control part 29 Laser control circuit 30 Sensor 200 Playback apparatus 100 Optical information recording medium

Claims (9)

Data in which content is recorded by forming a recording mark including a length less than or equal to the optical system resolution limit of the recording and / or reproducing apparatus based on a predetermined modulation method based on the first channel bit length A write-once or rewritable optical information recording medium that has a region and records and / or reproduces content by irradiating the data region with light emitted from a recording and / or reproducing device. ,
A disc management information area in which disc management information relating to the optical information recording medium is recorded; a recording / reproducing introduction area usable for recording / reproducing the data area in the recording and / or reproducing apparatus; and the data area Are arranged in this order in the scanning direction of the recording and / or reproducing device,
The disk management information area is the disk management information area on a substrate constituting the optical information recording medium based on a predetermined modulation method based on a second channel bit length longer than the first channel bit length. The disc management information is recorded by forming irregularities on the
The recording / reproducing introduction area and the data area are formed with irregularities in the recording / reproducing introduction area and the data area on the substrate based on a predetermined modulation method based on the first channel bit length. Thus, address information capable of specifying each position of a plurality of storage locations in each of the recording / reproducing introduction area and the data area is recorded. Concavities and convexities including a length less than or equal to the optical system resolution limit of the reproducing apparatus are formed at predetermined positions on the substrate constituting the medium based on a predetermined modulation method based on the first channel bit length. A reproduction-only optical information recording medium that has a data area in which content is recorded and that reproduces the content by irradiating the data area with light emitted from the reproduction apparatus. Because
A disc management information area in which disc management information relating to the optical information recording medium is recorded, a recording / reproduction introduction area usable for reproducing the data area by the reproduction apparatus, and the data area are the reproduction apparatus. Are arranged in this order in the scanning direction of
The disk management information area is the disk management information area on a substrate constituting the optical information recording medium based on a predetermined modulation method based on a second channel bit length longer than the first channel bit length. The disc management information is recorded by forming irregularities on the disc,
The optical information recording medium according to claim 1, wherein the recording / reproducing introduction region is provided with irregularities formed by multiplying the first channel bit length.   The recording / reproduction introduction area includes a reproduction use area that can be used when the recording and / or reproduction apparatus reproduces the content recorded in the data area, and a recording mark that is a multiple of the first channel bit length. 2. The optical information recording medium according to claim 1, further comprising a test write area for forming a / space column.   A pit / space sequence is formed in the recording / reproducing introduction area, and each pit / space length is 3T, 4T, 5T, 6T, 7T, 8T, where T is the first channel bit length. The optical information recording medium according to any one of claims 1 to 3, wherein the optical information recording medium is any one of 9T, 10T, and 11T. Each pit / space length of the pit / space row formed in the recording / reproducing introduction area is any one of 3T, 4T, 5T, 6T, 7T, 8T, 9T, 10T, and 11T,
5. The optical information recording medium according to claim 4, wherein the mark / space row having the one mark / space length is repeatedly formed.   6. The recording / reproducing introduction area is formed with a recording mark or a pit / space sequence for generating a reproduction clock required for reproducing the data area. 2. An optical information recording medium according to item 1. A method for reproducing an optical information recording medium for reproducing content recorded in the data area of the optical information recording medium according to any one of claims 1 to 6,
By generating light emitted from the recording and / or reproducing apparatus onto the recording / reproducing introduction area, a reproduction clock necessary for reproducing the content recorded in the data area is generated. A method for reproducing an optical information recording medium. A reproducing apparatus for an optical information recording medium for reproducing the content recorded in the data area of the optical information recording medium according to any one of claims 1 to 6,
A light source that emits light;
A reproduction clock generation circuit for generating a reproduction clock necessary for reproducing the content recorded in the data area by irradiating the recording / reproduction introduction area with light emitted from the light source; A reproducing apparatus for an optical information recording medium, comprising: A method for recording / reproducing an optical information recording medium for recording content in the data area of the optical information recording medium according to claim 3 and reproducing the content recorded in the data area,
A recording / reproducing method for an optical information recording medium, wherein a mark and a space string having a recording mark / space length formed by multiplying the first channel bit length are formed in the test write area of the recording / reproducing introduction area .

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