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Optical disk vibration sensing and reproducing device

a technology of vibration sensing and reproducing device, which is applied in the direction of digital signal error detection/correction, instruments, recording signal processing, etc., can solve the problems of increased vibration, affecting or disabling the signal reading, and becoming problematic, so as to avoid the failure of reading

Inactive Publication Date: 2007-02-20
VISION3D TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]Accordingly, an object of the invention is to provide an optical disk reproducing device capable of operating at a maximum velocity while at the same time avoiding failure of reading.

Problems solved by technology

With the increase in the velocity, vibrations increase and may become problematical.
The increased vibrations may affect or disable the signal reading.
The vibrations are caused by various factors such as eccentricity of the disk, variation in the position at which the disk is held, and unevenness in thickness of the disk.

Method used

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  • Optical disk vibration sensing and reproducing device
  • Optical disk vibration sensing and reproducing device
  • Optical disk vibration sensing and reproducing device

Examples

Experimental program
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Embodiment Construction

[0013]The preferred embodiments of the invention will now be described with reference to the drawings. FIG. 1 shows an embodiment of the invention.

[0014]The CD-ROM drive of this embodiment comprises a spindle motor 2 for rotating a CD-ROM disk 1. The CD-ROM disk 1 stores data representing characters, sound, images and the like along spiral tracks. At the innermost radial part of the disk is a TOC (table of contents) area, where addresses and the like of the respective pieces of data are stored. The above-mentioned data representing characters, sound, images and the like is stored in the data area which is outside of the TOC area.

[0015]An objective lens 4 converges the laser beam from a laser diode which is not shown, to form a beam spot on the surface of the disk, at which the data is read from the disk. The objective lens 4 also receives and directs the light reflected from the surface of the disk 1 to a focus / tracking controller 11.

[0016]A focusing unit 5 includes a focusing coil ...

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Abstract

In an optical disk reproducing device capable of rotating an optical disk at a selected one of a plurality of preset linear velocities, vibrations or shock of the device is detected during rotation of the disk, and the linear velocity of the disk is determined based on the result of the detection of the vibration or shock to restrain the vibration and shock within a permissible range. A limit rotational velocity above which the vibration or shock is excessive may be determined during a test conducted each time a disk is inserted, and the linear velocity of the disk during reproduction may be determined such that the rotational velocity does not exceed the limit rotational velocity.

Description

[0001]This application is a continuation of application Ser. No. 09 / 162,988 which is entitled “OPTICAL DISK VIBRATION SENSING AND REPRODUCING DEVICE”, filed Sep. 29, 1998, now U.S. Pat. No. 6,009,053, which is a continuation of application Ser. No. 08 / 855,252 filed May 13, 1997 entitled: “OPTICAL DISK VIBRATION SENSING AND REPRODUCING DEVICE”, now U.S. Pat. No. 5,886,966.BACKGROUND OF THE INVENTION[0002]The present invention relates to an optical disk reproducing device, and in particular an optical disk reproducing device which is capable of changing the linear velocity in accordance with the vibration of the device.[0003]The linear velocity at which commercially available optical disk reproducing devices can operate is increasing year by year. In the case of CD-ROM drives for use with personal computers, the velocity is increasing from ×1, to ×2, ×4, ×6, and so on, and many of the CD-ROM drives are designed to operate at a selected one of a plurality of linear velocities.[0004]The...

Claims

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Application Information

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IPC IPC(8): G11B3/90G11B19/04G11B19/28G11B33/08G11B7/00
CPCG11B33/08G11B19/04G11B19/28G11B7/005G11B7/0037G11B3/90G11B7/00
Inventor OTA, TAKUMIKISHISHITA, AKIHIROKODANI, KIYOSHIHAYASHIDA, MASAYUKI
Owner VISION3D TECH