Disk driving device for optical recording and reproduction and its method

An optical recording medium and multi-recording technology, applied in optical recording/reproduction, data recording, recording information storage, etc., can solve problems such as uneven surface, difficult detection of intermediate points, and difficulty in detecting intermediate points

Inactive Publication Date: 2003-07-16
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However if Figure 14 As shown, due to the noise of the signal and its variation in the layer spacing representing the distance between two recording layers, i.e. due to the non-uniform surface of the recording medium (which may be caused by dust or manufacturing defects), it is difficult to extract from This intermediate point is detected in the focus error signal
[0008] Also, intermediate point detection is more difficult due to variations in sensitivity of lens-driven actuators

Method used

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  • Disk driving device for optical recording and reproduction and its method
  • Disk driving device for optical recording and reproduction and its method
  • Disk driving device for optical recording and reproduction and its method

Examples

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Embodiment Construction

[0029] Subsequently, an optical disc device equipped with a preferred embodiment of the pickup drive device of the present invention will be described in detail with reference to the accompanying drawings.

[0030] figure 1 is a block diagram of an optical disk recording and / or reproducing apparatus equipped with an embodiment of the extraction drive apparatus of the present invention. As shown in the figure, the device includes an optical extractor 3 , a compensation filter 4 , a zero-crossing detector 8 , a servo controller 9 and a jump pulse generator 10 .

[0031] Disc 1 (preferably with the aforementioned Figure 12 The same as the optical disc 41) has a plurality of recording layers (A recording layer 46 and B recording layer 47). The spindle motor 2 rotates the optical disk 1 at a predetermined speed. The optical writing means 15 used to write data on the optical disc may consist of conventional components for this purpose known to a person skilled in the art. The l...

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Abstract

A disk driving device for use in recording and / or reproducing data on an optical recording medium having a plurality of recording layers. When a focus jump operation is executed between the recording layers, an actuator displaces an objective lens in response to a selectively generated acceleration or deceleration pulse and a focus error signal. Instability of the focus jump operation derived from noise superimposed on the focus error signal or from sensitivity variations in the actuator is eliminated.

Description

technical field [0001] The present invention relates to an optical disc drive device and its method, especially the device and method for recording or reproducing data on or from an optical recording medium (such as an optical disc) having multiple recording layers, so as to increase the recording capacity of the medium. Background technique [0002] Figure 12 A section of an optical disc 41 having a plurality of recording layers to increase its data recording capacity is shown. The disk base 42 of the optical disk 41 is formed of a light-transmitting layer such as polycarbonate, and an A recording layer 46 and a B recording layer 47 are formed on the bottom surface thereof. The A recording layer 46 is composed of a light semi-transmissive film, allowing incident light to partially enter and partially reflect. The B recording layer 47 is made of a total reflection film of aluminum or the like, and all incident light is reflected. A protective film 45 is formed on the reco...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H04N5/85G11B7/00G11B7/085G11B7/09
CPCG11B7/0908G11B2007/0013G11B7/08511G11B7/0945G11B19/20
Inventor筒井敬一小林基久
OwnerSONY CORP