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Disc recorder/reproducer

A technology for optical disc recording and playback devices, which is applied to optical recording heads, optical recording/reproduction, optical recording systems, etc., can solve the problems of long startup time and long retrieval time, and achieve high precision Effect

Inactive Publication Date: 2005-12-14
SANYO ELECTRIC CO LTD
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  • Description
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Problems solved by technology

[0006] However, in the above-mentioned optical disc recording and reproducing apparatus, in order to accurately retrieve the optimum reproduction power and optimum recording power, it is necessary to set the step width as small as possible when changing the reproduction power and recording power. As a result, the search must Takes quite a long time, causing problems with long startup times

Method used

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  • Disc recorder/reproducer
  • Disc recorder/reproducer
  • Disc recorder/reproducer

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Embodiment Construction

[0039] Hereinafter, an embodiment in which the present invention is applied to an optical disc recording and reproducing apparatus using a magneto-optical disc as a recording medium will be described in detail with reference to the drawings. As shown in FIG. 1, the optical disc recording and reproducing apparatus of the present invention includes a spindle motor (2) for rotationally driving a magneto-optical disc (1). A temperature sensor (16) is installed near the magneto-optical disk (1).

[0040] In addition, as a signal playback system, it includes a laser drive circuit (15), an optical head (4), a playback signal amplification circuit (5), a playback signal detection circuit (7) and an error correction circuit (11). When playing, the optical head (4) is driven by the laser drive circuit (15) to irradiate laser light to the magneto-optical disk (1). On the other hand, as a signal recording system, a magnetic head driving circuit (14) and a magnetic head (3) are provided. ...

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Abstract

The optical disc recording and playback device of the present invention comprises: a laser drive circuit (15) that can supply drive signals to the optical head (4) and adjust laser power; an error correction circuit (11) that detects the bit error rate of the playback signal; The output of the error correction circuit 11 is a system controller (10) that controls the operation of the laser drive circuit during signal reproduction and signal recording. The system controller sets the laser power to at least three different values ​​in sequence, obtains the estimated data in each laser power, approximates the relationship with a quadratic curve, and derives the optimal laser power corresponding to the apex of the quadratic curve . According to the optimal playback power and recording power settings, high-precision signal recording and playback can be performed.

Description

technical field [0001] The present invention relates to an optical disc recording and reproducing apparatus for irradiating laser light from an optical head to an optical disc to record a signal on the optical disc or to reproduce a signal from the optical disc. Background technique [0002] Conventionally, as the recording medium of this kind of optical disc recording and reproducing apparatus, rewritable, large storage capacity and high reliability magneto-optical discs have been developed, and are widely used in external memories of computers and audio-video equipment. Especially in recent years, the following technology has been developed, that is, on the signal surface of the magneto-optical disk (1) as shown in Figure 20, bosses (17) and grooves (18) are alternately formed, and bosses (17) and grooves (18) are formed alternately. ) on the recording signal, improve the recording density technology. [0003] As shown in the figure, the boss (17) and the groove (18) are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/0045G11B7/005G11B7/126G11B7/1267G11B11/105H01S5/068
CPCG11B7/0045G11B7/126G11B7/1267G11B11/1051G11B11/10515G11B11/10595G11B7/004G11B7/1263H01S5/068
Inventor 矢野秀盟浅野贤二岸田孝范
Owner SANYO ELECTRIC CO LTD
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