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Device of reading out and/or writing in information for optical recording medium

A technology of optical recording media and recording media, applied in the direction of optical recording head, recording/reproducing with optical method, measuring device, etc., can solve the problems of lagging, impossible to measure the scanner accurately, etc., and achieve high precision and high The effect of measurement accuracy

Inactive Publication Date: 2004-06-23
DEUTSCHE THOMSON-BRANDT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this device is the presence of hysteresis due to the mechanical connection and mechanical conditions of the rotating disk and motor
So it is not possible to measure the position of the scanner precisely

Method used

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  • Device of reading out and/or writing in information for optical recording medium
  • Device of reading out and/or writing in information for optical recording medium
  • Device of reading out and/or writing in information for optical recording medium

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0020] Fig. 1 shows a plan view of components in a device according to the invention. The scanner 1 shown schematically is fastened via a holding element 2 to a guide rail 3 and a drive shaft 4 . The drive shaft 4 is driven by a motor 5, which acts as a rough drive. As shown, it includes a thread that cooperates with a corresponding thread in the retaining element. The guide rail 3, the driving shaft 4 and the motor 5 are fixed on the bottom plate 6 of the device for writing and / or reading information from the optical recording medium. A disk motor (not shown) is also fixed to the chassis 6 to drive the disk turntable 7 . An optical recording medium (such as a compact disk, or CD) can be placed on the disk turntable and played back. The scanner includes a laser diode 8 which emits a divergent beam 9 . The latter passes through a beam splitter 10 and is turned into a parallel beam of rays by a collimator 11 . The above-mentioned bundle of parallel rays is projected onto a ...

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PUM

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Abstract

The present invention relates to an apparatus for reading from and / or writing to optical recording media having a scanner for scanning the recording medium, a coarse drive for moving the scanner relative to the recording medium and a measuring device for determining the travel of the scanner. The object of the present invention is to propose an apparatus of this type in which it is possible to determine the position of the scanner as exactly as possible, the intention being for this to be ensured even in the event of a high movement speed or acceleration. The invention is particularly advantageous for apparatuses which require rapid access to extremely diverse locations on the recording medium, as is the case with apparatuses appertaining to optical data storage, for example CD-ROM or DVD-ROM apparatuses.

Description

technical field [0001] The invention relates to a device for reading information from and / or writing information to an optical recording medium, comprising a measuring device for determining the stroke of a scanner, and a method for measuring the stroke. Background technique [0002] US-A 4,977,539 describes a device of this type. The measuring device of the device includes a rotating disk provided with a groove and an optical sensor for measuring the rotation of the rotating disk. The rotating disc is connected to a motor that drives the scanner. The disadvantage of this device is the presence of hysteresis due to the mechanical connection and mechanical conditions of the rotating disk and the motor. So it is impossible to accurately measure the position of the scanner. Contents of the invention [0003] It is an object of the invention to provide a device which determines the position of the scanner as precisely as possible even during high-speed or accelerated moveme...

Claims

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Application Information

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IPC IPC(8): G11B21/08G01B9/02G11B7/085G11B7/135
CPCG11B7/08505G11B7/08588
Inventor 苏珊·阿亚里克里斯托夫·迪特里希
Owner DEUTSCHE THOMSON-BRANDT GMBH