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Optical disk modified for speed and orientation tracking

An optical disc, speed technology, applied in the direction of optical recording/reproduction, data recording, packaging, etc.

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

Applying an image to a DVD label therefore involves many of the same issues as applying an image to a CD label

Method used

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  • Optical disk modified for speed and orientation tracking
  • Optical disk modified for speed and orientation tracking
  • Optical disk modified for speed and orientation tracking

Examples

Experimental program
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Embodiment Construction

[0020] An optical disc is configured to allow an image to be applied to the label side of the disc. The disc includes features that may be embossed, silk-screened, or otherwise formed, or coated, which provide disc orientation (i.e., the way the label side of the disc is oriented in the optical disc drive), rotational Information on velocity and angular orientation (ie the direction in which a ray originating at the center of the disc and passing a given point on the circumference of the disc is pointed in an optical disc drive). Optical disk drives include encoders that monitor these characteristics, thereby initially detecting disk orientation, and subsequently monitoring disk speed and angular orientation, thereby assisting in applying an image to the label surface of the optical disk. In an exemplary embodiment, the disc velocity relative to the OPU (i.e., the velocity of the media past the OPU (optical pickup unit), resulting in a continuously varying RPM as the OPU moves...

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Abstract

An optical disc (100) including a label area (106) having writable material. The disc speed signature (112) is positioned in such a way as to allow reading of said disc speed signature (112) when written to the label area (106).

Description

Background technique [0001] CDs have long spiral data tracks, about 3.5 miles in length. This continuous data track originates in the central portion of the disc and spirals to the outer portions of the disc. The data is formed by embossing features on the upper surface of the polycarbonate plastic disc. Although the size of such features may vary between CDs and DVDs, they may be approximately 0.5 microns to 1.2 microns across. The centerlines of adjacent rings of a long continuous data spiral on a CD may be separated by approximately 1.6 microns. The data features in the continuous data spiral appear as "pits" when viewed from above, but "bumps" when viewed from below. During data reading, the bumps are viewed from below by the optical pickup unit (OPU) of the optical disc drive. The upper surface of the polycarbonate plastic disc in which the dimples are molded is covered with a layer of aluminum which is in turn covered with a layer of acrylic resin and finally a label...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B23/40G11B7/0037G11B23/42
CPCG11B7/0037G11B23/40G11B23/42
Inventor J·M·克格勒三世A·L·范布洛克林D·E·安德森M·T·马吉尔
Owner HEWLETT PACKARD DEV CO LP