JP2009176413A - Optical disk and optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide information that enables an optical disk device to record over the entire surface of an optical disk stably and easily by appropriate power. <P>SOLUTION: When disk radius position information or information correlated with a disk radius position is given, information for acquiring recording power appropriate at the radius position or an indication value for deriving the appropriate recording power can be provided, thereby enabling recording over the entire surface of the optical disk with the appropriate power. Information on the recording power or information on a plurality of recording powers for supporting various recording speeds is recorded on the disk. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to recording power information in a disk device.

  A recordable optical disc has a test writing area for the disc device to determine a laser power suitable for recording on the optical disc on the inner periphery of the disc, the outer periphery of the disc, or both the inner periphery and the outer periphery of the disc. Yes.

  Prior to recording data in the data area on the optical disk, the disk apparatus obtains a laser power for recording data in the data area in the test writing area on the optical disk.

  However, since the laser power necessary for recording is not determined at the position where data is actually recorded, there may be cases where the optimum laser power is not substantially obtained.

Therefore, in the disk device, trial writing is performed at two points on the inner and outer circumferences of the optical disk, and the difference in the recording laser power obtained at each of the two points is taken into consideration, and an arbitrary data in the data area located between the two points is selected. The recording laser power at the radial position is determined, or the validity of the recording power is confirmed based on the reflected light from the optical disk being recorded, and the laser power is finely adjusted as appropriate.
About the above, there exists patent document 1, etc., for example.

JP 2004-199748 A

  It is an object of the present invention to provide information that enables an optical disc apparatus to perform recording with appropriate power stably and easily over the entire surface of an optical disc.

  In order to solve the above problems, the present invention provides an index for deriving an appropriate recording power or an appropriate recording power at the radial position when the disk radial position information or information correlated with the disk radial position is given. Provide information from which values can be obtained.

  The object is achieved by the invention described in the claims.

  The optical disk apparatus can perform recording on the entire surface of the disk with an appropriate laser power.

An example of laser power information provided by an embodiment of the present invention An example of laser power information provided by an embodiment of the present invention An example of laser power information provided by an embodiment of the present invention An example of laser power information provided by an embodiment of the present invention An example of an optical disk apparatus equipped with a laser of an embodiment of the present invention

  The present invention exerts its effect by applying an optical disk.

  Laser power information is provided so that the disk device can record the entire surface of the disk with an appropriate laser power. The straight line indicated by 101 in FIG.

  The laser power information 101 shown in FIG. 1 represents the relationship with the recording laser power (vertical axis of graph) when it is the radial position (graph horizontal axis) of the optical disk, which is the data recording position, and the outer circumference side of the disk. This indicates that the recording laser power needs to be increased as the radial position becomes larger. In FIG. 1, the laser power information is shown as a graph for easy visual understanding. However, if this information is given information correlated to the disk radial position, the laser recording power required at the disk radial position is actually shown. It is recorded on the optical disk as a mathematical expression to be derived.

  The optical disc apparatus reads the laser power information indicated by this mathematical formula and determines the recording laser power at the radial position of the optical disc.

  In FIG. 1, the laser power information is shown as a linear curve, but this is an example, and the present invention does not limit the laser power information to a linear curve. A curve other than the primary curve may be used as indicated by 201 in FIG. That is, as long as it can be expressed as a mathematical expression, the laser power information may be any number of expressions, and can correspond to optical disks having various characteristics.

  The present invention also provides laser power information by methods other than mathematical formulas. The straight lines indicated by 301, 302, 303, 304, and 305 in FIG. The graph shown in FIG. 3 shows that the horizontal axis is the disk radial position and the vertical axis is the recording laser power, as in FIG. 1, and it is necessary to increase the recording laser power stepwise toward the radial position on the outer periphery of the disk. Yes.

  FIG. 3 shows the laser power information by a graph for easy visual understanding. Actually, this information is necessary for information correlated with the disk radial position (for example, address information) and the disk radial position. The information is combined with the recording laser power to be recorded on the optical disc. 3 shows an example in which the horizontal axis of the graph is equally divided into five, the number of divisions is not necessarily limited to five, and the width of each divided section is not necessarily uniform. .

  As shown by 401, 402, 403, 404, 405, 406, and 407 as shown in FIG. 4, for example, the number of divisions may be set to 7, and it is not necessary that each section has a uniform width as shown in FIG. To the point of being bored, the number of divisions and the width of each divided section may be determined according to the characteristics of the optical disc.

  In the disk device, the optimum power is recorded over the entire surface of the optical disk by applying the recording laser power determined by the trial writing performed by the disk apparatus itself in the trial writing area of the optical disk to the laser power information recorded in advance on the optical disk. The recording laser power can be determined.

  FIG. 5 shows an example of a disk device. In FIG. 5, 501 is an optical disk, 502 is a spindle motor that rotates the disk, 503 is a pickup that focuses the laser beam on the optical disk, 504 is a feed screw that rotates to move the pickup in the radial direction of the optical disk, and 505 is a feed A feed motor 506 serving as power for rotating the screw is a controller that controls each part of the disk device and transmits / receives recording data and reproduction data to / from the host device of the disk device. Such a disk device can record data at an arbitrary position of the rotating disk by moving the pickup in the disk radial direction. Further, when data is recorded on the optical disk, trial writing is performed in a test area provided in the innermost circumference of the disk, and after laser power is determined, recording is performed at an arbitrary position on the disk. An example of utilizing the laser power information provided by the present invention in such a disk device will be described below.

  For example, the radial position where the disk device has performed the trial writing is applied to a white circle on the horizontal axis of the graph indicated by 102 in FIG. 1, and this is set as the reference radial position. Further, the recording laser power obtained by the trial writing by the disk device is applied to a white square mark indicated by 103 in FIG. 1, and this is used as the reference recording laser power.

  By performing such fitting, for example, in the case where recording is performed at the radial position of the black circle on the horizontal axis indicated by 104 in FIG. 1, the disk device can display the required recording laser power at the radial position. It can be easily known that the laser power is a black square on the vertical axis of the graph indicated by 105 of 1.

  The disk device can acquire the laser power information provided by the present invention by reading the optical disk.

  Although the method of utilizing the laser power information in the disk device has been described using FIG. 1 as a representative example, any of the laser power information shown in FIGS. 2, 3, and 4 can be arbitrarily set by performing the same fitting process. The recording laser power required at the disk radial position can be determined.

  Note that the reference radius position does not necessarily have to be the innermost circumference of the disc, but normally, since the test writing area is at the innermost circumference of the disc, it is set to the innermost circumference of the disc in this example. In addition, the vertical axis of each graph in FIGS. 1, 2, 3, and 4 may be an absolute laser power, or may be a normalized numerical value with a reference laser power of 1.

  Further, the laser power information recorded on the optical disc need not be limited to one type, and a plurality of pieces of information corresponding to recording conditions such as recording speed, rotation control, etc. may be recorded on the optical disc. The laser power information is preferably recorded on the disk in advance by the disk manufacturer when the disk is shipped, but the disk device itself may construct information and record it on the disk as the recording is repeated.

101 ... Laser power information according to an embodiment of the present invention,
102 ... reference radius position,
103: Reference laser power,
104 ... Recording execution disk radius position,
105 ... Recording laser power at the radial position of the recording execution disk,
201 ... Laser power information according to an embodiment of the present invention,
202 ... Reference radius position,
203 ... Reference laser power,
204 ... Recording execution disk radius position,
205 ... Recording laser power at the radial position of the recording execution disk,
301... Part of laser power information according to an embodiment of the present invention,
302... Part of laser power information according to an embodiment of the invention,
303 ... a part of laser power information according to an embodiment of the present invention,
304... Part of laser power information according to an embodiment of the present invention,
305... Part of laser power information according to an embodiment of the present invention,
306 ... reference radius position,
307: Reference laser power,
401... Part of laser power information according to an embodiment of the present invention,
402... Part of laser power information according to an embodiment of the invention,
403 ... a part of laser power information according to an embodiment of the present invention,
404... Part of laser power information according to an embodiment of the present invention,
405... Part of laser power information according to an embodiment of the present invention,
406... Part of laser power information according to an embodiment of the present invention,
407 ... part of the laser power information according to an embodiment of the invention,
408: Reference radius position,
409: Reference laser power,
501... Optical disc,
502 ... Spindle motor,
503 ... Pickup,
504 ... feed screw,
505 ... Feed motor,
506: Controller.

Claims (5)

  A laser capable of deriving an index value for determining the recording laser power at the disk radial position or the recording laser power when the disk radial position information or information correlated with the disk radial position is given to the optical disk. An optical disc characterized in that power information is recorded on the disc. The optical disc of claim 1,
An optical disc characterized in that a plurality of pieces of laser power information corresponding to the recording double speed are recorded on the disc. The optical disc of claim 1,
An optical disc, wherein a plurality of pieces of laser power information corresponding to the rotation control method are recorded on the disc. The optical disc of claim 1,
An optical disc, wherein a plurality of pieces of laser power information corresponding to a combination of a recording double speed and a rotation control method are recorded on the disc. An optical head having a laser for recording data on an optical disc;
Means for reading from the optical disc laser power information relating to the recording power of the laser recorded on the optical disc;
Having laser power control means for controlling the laser power,
The laser power control means gives to the laser power information the position information for recording the data in the radial direction of the disk or information correlated with the position in the radial direction of the disk, and the recording laser at the radial position of the disk An optical disc apparatus characterized by deriving information for determining power or recording laser power.

Images