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Data processing unit

A technology of data processing unit and control data, applied in the direction of configuration/installation of the head, can solve the problem of increasing the processing time of digital-to-analog conversion, and achieve the effect of easy quality and improved quality

Active Publication Date: 2014-09-24
RENESAS ELECTRONICS CORP
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  • Description
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Problems solved by technology

However, in feedforward control, in order to improve the motion resolution of the focus actuator, if only the number of bits of control data used for feedforward control is increased, the processing of digital-to-analog conversion will be performed while obtaining control data based on learning. time will increase

Method used

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Embodiment Construction

[0042] "Overview of Optical Disc Devices"

[0043] figure 2 An example of an optical disc device is shown in . The optical disc device shown in this figure is capable of recording and reproducing information on one side of the optical disc using laser light, and has a structure capable of performing label printing on the other side of the optical disc using the laser light. In this figure, an optical disc device 1 includes: a single-board microcomputer (SMCU) 2, SDRAM 3, an analog front end (AFE) 4, an optical pickup (OPU) 5, a linear motor (TM) 6, and a disk motor (DM) 7. , motor driver (MDRV) 8, and label printing position detector (SPD) 9, etc. The optical disc on which the optical disc device can record and reproduce may be one or more of CD-ROM, DVD, DVD-RW, DVD-RAM, and the like. The laser frequency, data processing speed, filter characteristics, etc. are different according to the object.

[0044] On the surface of the optical disc 10, for example, information trac...

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Abstract

The invention provides a data processing unit for an optical disc device which is capable of recording and reproducing information by irradiating laser from an object lens to one surface of an optical disc and performing label printing on a disk device by irradiating the laser from the object lens to the other surface of the optical disc. The data processing unit is characterized by performing feedback control on a shift position of the object lens based on a focusing actuator according to a focusing error signal; the focusing error signal is output by a circuit for forming the focusing error signal for focusing servo according to reflected light of the optical disc subjected to the laser irradiation; during label printing, the data processing unit performs feedforward control on the shift position of the object lens based on the focusing actuator according to control data for label printing; and when the data processing unit performs the feedforward control, the driving circuit of the focusing actuator can control gain switching to be lower than the gain switching when the data processing unit performs the feedback control.

Description

[0001] This application is a divisional application of the invention patent application with the application number 200580051035.7, the application date is May 23, 2005, and the invention name is "optical disk device". technical field [0002] The present invention relates to an optical disc device capable of printing titles, photographs, etc. on the label surface of an optical disc coated with photosensitive laser paint, etc., and a data processing unit used in the optical disc device. Background technique [0003] In Patent Documents 1 (Japanese Unexamined Patent Publication No. 58-155527 ) and 2 (Japanese Patent Laid-Open No. 58-212631 ), it is described that in order to read data from the signal surface of a CD-ROM or the like, the focus of the laser beam is focused on the disc. Focus servo on signal face. For example, based on the focus error signal obtained from the output of the photodetector that divides the reflected light of the disk into four, the objective lens o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/09
Inventor 矶佳实萩原光夫木村光行
Owner RENESAS ELECTRONICS CORP
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