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Sensing media speed

A medium and electromagnetic radiation technology, which is applied in the recording of information on the disk, data recording, instruments, etc., can solve problems such as errors

Inactive Publication Date: 2006-10-18
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the speed is not known precisely, errors may occur when writing to or reading from the media

Method used

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  • Sensing media speed
  • Sensing media speed
  • Sensing media speed

Examples

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Embodiment Construction

[0011] figure 1 and 2 Illustrated in is an embodiment of the mass storage device 2 of the present invention. In one embodiment, the mass storage device 2 comprises a mass storage medium 4, a rotating device 10, an electromagnetic radiation sensor 14, an electromagnetic radiation emitter 16, a controller 18 and optionally, a reflective area 6, a non-reflective area 8, Electromagnetic radiation source 12 , calculator 20 and program storage system 22 . Preferably the mass storage device 2 is an optical disc drive, although it could be other forms of mass storage device, such as magnetic, electrical, physical or atomic resolution devices.

[0012] The mass storage medium 4 is any medium on which information may be stored, and is preferably removable or replaceable. The mass storage medium has at least an inner edge 26 and optionally an outer edge 24 . In one embodiment, the mass storage medium 4 is an optical disc, such as a CD, CD-R, CD-RW, CD+RW, DVD, DVD-R, DVD-R / W or DVD+R...

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Abstract

Electromagnetic radiation is used to control exposure of the medium (4) to electromagnetic radiation. The medium (4) is rotated (38). The frequency of electromagnetic radiation radiated from the edges (24, 26) of the medium (4) is detected. Exposure of the medium (4) to electromagnetic radiation is controlled using the detected frequency.

Description

technical field [0001] The present invention relates generally to the detection and precise control of medium velocity and precision and, more particularly, to the use of electromagnetic radiation detected from the medium to control the precise positioning of the medium's exposure to electromagnetic radiation. Background technique [0002] It is often necessary to know the rotational speed of the media precisely. Additionally, operating the motor at low speed causes friction to change speed (thus creating oscillation) within one revolution. Further, high or low speed slippage of the medium on the spindle causes errors in writing to the medium. Accurately knowing the actual velocity and position of the media will allow reading from or writing to the media with greater precision. [0003] For some media (eg CD, DVD and their variants) the timing information is encoded into the data track of the media or in the wobble grooves. Conventional data media accessed by lasers can u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B19/28
CPCG11B19/28G11B19/20G11B19/24
Inventor D·M·汉克斯A·范布洛克林
Owner HEWLETT PACKARD DEV CO LP