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Determing method for disk type and disk device

A technology of optical disc type and determination method, applied in the direction of recording/reproducing by optical method, optical recording/reproducing/erasing method, recording of information on the magnetic disc, etc., can solve the problem of not being able to correctly determine the optical disc, etc.

Inactive Publication Date: 2004-04-21
SANYO ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In addition, strictly speaking, in the case of judging CD and DVD or in the case of judging CD-R and DVD-R, as mentioned above, since the track pitch and the like are different, it is necessary to change the wavelength of the laser light. Therefore, in the above-mentioned prior art cannot correctly determine the disc

Method used

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  • Determing method for disk type and disk device
  • Determing method for disk type and disk device
  • Determing method for disk type and disk device

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Embodiment Construction

[0022] Referring to FIG. 1 , an optical disc device 10 according to the present embodiment includes an optical pickup 12 on which an objective lens 14 is provided. The objective 14 is supported by a tracking actuator 16 and a focusing actuator 18 . Laser light emitted from the laser diode 20 is irradiated onto the recording surface of an optical disc 22 such as a DVD-RW or DVD+RW via an unillustrated optical system and an objective lens 14 .

[0023] In addition, an optical disc 22 is mounted (clamped) on a turntable 24 and rotated by a spindle motor 26 . For example, the optical disc 22 may rotate in a CLV (Constant Linear Velocity) manner, the number of revolutions decreasing as the optical pickup 12 moves from the inner circumference to the outer circumference.

[0024] In addition, on the recording surface of the optical disc 22, convex lands and concave grooves are alternately formed for each track (refer to Figure 4 ).

[0025] Referring to FIG. 2(A) and FIG. 2(B), s...

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Abstract

The disk device 10 includes a disk 22, and a DVD-RW or a DVD+RW is loaded as the disk 22. For example, the wobbling signal is detected based on a laser light reflected on the recording surface of the disk 22. A CPU 40 determines whether the cycle (wobbling cycle) of the wobbling signal is 32 times or 186 times higher than the data cycle based on the detection result of a detection circuit 48. Then, the type of a disk is determined to be a DCD-RW if the wobbling cycle is 186 times higher than the data cycle, and a DVD+RW if the wobbling cycle is 32 times higher than the data cycle. Since the type of a disk is determined in accordance with the wobbling cycle, the disk is accurately determined even in the cases of the disks of equal track pitches or reflectances, and recording / reproducing is stably executed.

Description

technical field [0001] The present invention relates to a method for judging the type of an optical disc and an optical disc device, and more particularly to a method for judging the type of an optical disc and an optical disc device for recording and reproducing according to the determined type of optical disc, for example, by determining whether it is DVD-RW or DVD+RW. Background technique [0002] An example of a conventional optical disc device of this type is disclosed in Patent Document 1. This prior art disc judging device detects the presence or absence of a wobble signal when the disc is driven to rotate at a predetermined number of revolutions. When there is no wobble signal, the rotation control circuit for coarse servo and fine servo is switched, and it is determined whether the disc is a CD or a DVD based on the output (lock signal) from a different PLL circuit that locks the reproduced signal of the CD or DVD. On the other hand, when there is a wobble signal, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/004G11B7/00G11B7/005G11B7/007
CPCG11B7/0053G11B7/24082G11B2007/0006G11B7/00745
Inventor 多田浩一山口光隆
Owner SANYO ELECTRIC CO LTD
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