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  Information recording medium, information recording device and methodUSPTO Application #: 20070041308Title: Information recording medium, information recording device and method Abstract: A disc-shaped information recording medium includes a first recording layer (L0 layer) having (I) a first trial write area (101P-1) for trial write of first trial write information for calibration of the laser beam along the first track path (TP1) from the inner circumference toward the outer circumference and (II) a first recording area for recording the first recording information along a first track path (TP1), in this order from the inner circumference side. Furthermore, the disc-shaped information recording medium includes a second recording layer (L1 layer) having (I) a second trial write area (101P-2) for trial write of second trial write information for calibration of the laser beam along the second track path (TP2) from the outer circumference toward the inner circumference and (II) a second recording area for recording the second recording information along a second track path (TP2), in this order from the inner circumference side. (end of abstract)
Agent: Young & Thompson - Arlington, VA, US Inventors: Eiji Muramatsu, Shoji Taniguchi, Kunihiko Horikawa, Masahiro Kato, Toshio Suzuki, Kazuo Kuroda USPTO Applicaton #: 20070041308 - Class: 369283000 (USPTO) Related Patent Categories: Dynamic Information Storage Or Retrieval, Storage Medium Structure, Layered (e.g., Permanent Protective Layer) The Patent Description & Claims data below is from USPTO Patent Application 20070041308. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to an information recording medium, such as a DVD, and an information recording apparatus, such as a DVD recorder, an information recording method. BACKGROUND ART [0002] For example, in the information recording medium, such as a CD and a DVD, as described in patent documents 1 and 2 or the like, there are developed a multiple layer or multilayer type, or dual layer type optical disc and so on, in which a plurality of recording layers are laminated or stacked on the same substrate. Then, in the information recording apparatus, such as a CD recorder, for recording information onto such a dual layer type (i.e. two-layer type) optical disc, the information is recorded into a recording layer (referred to as a "L0 layer" in this application, as occasion demands), located on the front or the closest side as viewed from the emission or irradiation side of laser light, in a rewritable method or irreversible change recording method by irreversible change recording heat by using heat or the like, by focusing the L0 layer with the laser light for recording. Moreover, the information is recorded into a recording layer (referred to as a "L1 layer" in this application), located on the rear of the L0 layer as viewed from the irradiation side of the laser light, in a rewritable method or irreversible change recording method by irreversible change recording heat by using heat or the like, by focusing the L1 layer with the laser light through the L0 layer. [0003] Moreover, in this type of optical disc or the like, the optimum power of a recording power is set by an OPC (Optimum Power Calibration) process, depending on the type of the optical disc and the type and recording rate of the information recording/reproducing apparatus, and so on. That is, the calibration is performed for the recording power. By this, it is possible to realize an appropriate recording operation which responds to variation in characteristics of the information recording surface of the optical disc. For example, if the optical disc is loaded and a writing command is inputted, data for test writing is recorded into an OPC area, with sequentially changing the optical intensity, so that a so-called "test writing process" is performed. In particular, according to the patent document 1, the OPC area is provided for each of the two recording layers, and a technology of performing the OPC process for each of the two layers is disclosed. [0004] Patent document 1: Japanese Patent Application Laying Open NO. 2000-311346 [0005] Patent document 2: Japanese Patent Application Laying Open NO. 2001-23237 DISCLOSURE OF INVENTION [0005] Object to be Solved by the Invention [0006] However, out of such two-layer type information recording media, in an information recording medium of a "parallel type or parallel method" in which the directions of track paths are the same in the two recording layers, for example, if a series of content information, such as a movie, is continuously recorded into the two recording layers, upon the recording thereof, it is necessary to return an optical pickup which has reached the most outer circumference of the disc after the recording in the L0 layer is ended, to the most inner circumferential side of the disc before the recording in the L1 layer is started, and to restart the recording in the L1 layer. Moreover, if the series of content information, such as a movie, is recorded in this manner, upon the reproduction thereof, it is necessary to return the optical pickup which has reached the most outer circumference of the disc after the reproduction in the L0 layer is ended, to the most inner circumferential side of the disc before the reproduction in the L1 layer is started, and to restart the reproduction in the L1 layer. Thus, there is such a technical problem that uninterrupted reproduction is not easy in terms of time. For example, if a reproduction buffer is set to be huge, it is possible to perform the uninterrupted reproduction, in changing the recording layer which is the target of such reproduction; however, it is extremely disadvantage in practice to incorporate the huge buffer only for this purpose, from the viewpoint of cost or the like. In addition, there is also such a problem that even if record information in which interruption is allowed is recorded or reproduced, when the recording layer is actually changed, it takes an extremely long time. [0007] On the other hand, out of such two-layer type information recording media, in an information recording medium of an "opposite type or opposite method" in which the directions of track paths are opposite in the two recording layers, for example, a "PCA (Power Calibration Area)", which is an exclusive area for performing the OPC process in the L0 layer, is set to be an area on the most inner circumferential side of the disc, which is near the start point of the track path in the L0 layer. In the same manner, the PCA area in the L1 layer is set to be an area on the most outer circumferential side of the disc, which is near the start point of the track path in the L1 layer. However, in the case of such construction, if the OPC process is collectively performed for both the L0 layer and the L1 layer, it is necessary to displace the optical pickup, located near the most inner circumference of the disc after the OPC process is ended in the L0 layer, to near the most outer circumference of the disc before the OPC process is started in the L1 layer, and to restart the OPC process in the L1 layer. Therefore, there is such a technical problem that it takes an extremely long time for the OPC process. On the contrary, if the OPC process is separately performed for the L0 layer and the L1 layer, after the OPC process in the L0 layer, the recording is performed in the L0 layer, and when the recording in the L0 layer is ended, the OPC process is performed in the L1 layer, and after that, the recording is performed in the L1 layer. However, this causes such a technical problem that it takes an extremely long time in changing the recording layer during the recording operation. [0008] In order to solve the above-mentioned conventional problems, it is therefore an object of the present invention to provide a multilayer type information recording medium on which test writing can be efficiently performed and the record information can be efficiently recorded, into each recording layer, and an information recording apparatus and an information recording method capable of efficiently recording the information onto such an information recording medium. Means for Solving the Object [0009] In order to solve the above-mentioned object, an information recording medium according to claim 1 of the present invention is an information recording medium in a disc shape, provided with: a first recording layer having (I) a first test writing area to test-write therein first test-write information for calibration of laser light for recording, along a first track path directed from an inner circumferential side to an outer circumferential side of the information recording medium, by irradiating the laser light thereto, and (II) a first recording area to record therein first record information along the first track path, by irradiating the laser light thereto, in this order from the inner circumferential side; and a second recording layer, located on a rear of the first recording layer as viewed from an irradiation side of the laser light and having (I) a second test writing area to test-write therein second test-write information for calibration of the laser light, along a second track path directed from the outer circumferential side to the inner circumferential side, by irradiating the laser light thereto, and (II) a second recording area to record therein second record information along the second track path, by irradiating the laser light thereto, in this order from the inner circumferential side. [0010] In order to solve the above-mentioned object, an information recording apparatus according to claim 7 of the present invention is an information recording apparatus for recording first information and second information onto an information recording medium in a disc shape, provided with: a first recording layer having to record therein the first information along a first track path directed from an inner circumferential side to an outer circumferential side of the information recording medium, by irradiating laser light for recording thereto; and a second recording layer, located on a rear of the first recording layer as viewed from an irradiation side of the laser light, to record therein the second information along a second track path directed from the outer circumferential side to the inner circumferential side of the information recording medium, by irradiating the laser light thereto, in this order from the inner circumferential side, the information recording apparatus provided with: a writing device for writing the first information into the first recording layer by irradiating the laser light to focus on the first recording layer and writing the second information into the second recording layer by irradiating the laser light to focus on the second recording layer; a test-writing control device for controlling the writing device to test-write first test-write information for calibration of the laser light, into the first recording layer as one portion of the first information, and to test-write second test-write information for calibration of the laser light, into the second recording layer as one portion of the second information; and a recording control device for controlling the writing device (I) to record first record information into the first recording layer, along the first track path as another portion of the first information, on the outer circumferential side of an area in which the first test-write information is test-written, by using the laser light calibrated on the basis of the first test-write information, and (II) to record second record information into the second recording layer, along the second track path as another portion of the second information, on the outer circumferential side of an area in which the second test-write information is test-written, by using the laser light calibrated on the basis of the second test-write information, after the first and second test-write information are test-written by the test-writing control device. [0011] In order to solve the above-mentioned object, an information recording method according to claim 14 of the present invention is an information recording method in an information recording apparatus for recording first information and second information onto an information recording medium in a disc shape, provided with: a first recording layer having to record therein the first information along a first track path directed from an inner circumferential side to an outer circumferential side of the information recording medium, by irradiating laser light for recording thereto; and a second recording layer, located on a rear of the first recording layer as viewed from an irradiation side of the laser light, to record therein the second information along a second track path directed from the outer circumferential side to the inner circumferential side of the information recording medium, by irradiating the laser light thereto, in this order from the inner circumferential side, the information recording apparatus provided with: a writing device for writing the first information into the first recording layer by irradiating the laser light to focus on the first recording layer and writing the second information into the second recording layer by irradiating the laser light to focus on the second recording layer, the information recording method provided with: a test-writing control process of controlling the writing device to test-write first test-write information for calibration of the laser light, into the first recording layer as one portion of the first information, and to test-write second test-write information for calibration of the laser light, into the second recording layer as one portion of the second information; and a recording control process of controlling the writing device (I) to record first record information into the first recording layer, along the first track path as another portion of the first information, on the outer circumferential side of an area in which the first test-write information is test-written, by using the laser light calibrated on the basis of the first test-write information, and (II) to record second record information into the second recording layer, along the second track path as another portion of the second information, on the outer circumferential side of an area in which the second test-write information is test-written, by using the laser light calibrated on the basis of the second test-write information, after the first and second test-write information are test-written by the test-writing control process. [0012] These effects and other advantages of the present invention become more apparent from the following embodiments and example. BRIEF DESCRIPTION OF DRAWINGS [0013] FIG. 1 shows the basic structure of an optical disc according to a first example of the information recording medium of the present invention, wherein the upper part is a substantial plan view showing the optical disc having a plurality of areas and the corresponding lower part is a schematic conceptual view showing a recording area structure in the radial direction. [0014] FIG. 2 is a partially enlarged perspective view showing a recording surface of the optical disc according to the first example of the information recording medium of the present invention. recording medium of the present invention. [0015] FIG. 3 is a data structural view conceptually showing the data structure of the optical disc and an area used in an OPC process, according to the first example of the information recording medium of the present invention. [0016] FIG. 4 is a data structural view conceptually showing the data structure of the optical disc and the area used in the OPC process, according to a second example of the information recording medium of the present invention. [0017] FIG. 5 is a data structural view conceptually showing the data structure of the optical disc and the area used in the OPC process, according to a third example of the information recording medium of the present invention. [0018] FIG. 6 is a data structural view conceptually showing the data structure of the optical disc and the area used in the OPC process, according to a fourth example of the information recording medium of the present invention. [0019] FIG. 7 is a block diagram showing an information recording/reproducing apparatus in an example of the information recording apparatus of the present invention. [0020] FIG. 8 is a flowchart showing the recording operation and the OPC process of the optical disc in the example of the information recording apparatus of the present invention. Continue reading... Full patent description for Information recording medium, information recording device and method Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Information recording medium, information recording device and method patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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