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Data storage media by oriented light beam and near field light source

A technology of data storage area and data storage layer, applied in the field of information storage, can solve the problems of difficulty in detection and prone to errors, etc.

Inactive Publication Date: 2006-07-05
HEWLETT PACKARD CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of reflected light is so small that there is only a very small change in the output power of the laser, making detection difficult and prone to errors

Method used

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  • Data storage media by oriented light beam and near field light source
  • Data storage media by oriented light beam and near field light source
  • Data storage media by oriented light beam and near field light source

Examples

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Embodiment Construction

[0022] Referring to FIG. 1, a prior art near-field optical laser system 10 is shown. The laser system 12 includes a laser emitting element 13 , such as a semiconductor laser diode, arranged above an optical channel device 14 that tapers downwards to a hole 16 at the bottom of the laser substrate 11 . The diameter of the light transmission aperture 16 extends to a light shielding layer 18 on the bottom of the laser system 12 . The hole 16 is smaller than the wavelength of the laser beam emitted from the laser element 13 . For example, the wavelength of the laser beam may be about 400 nanometers, and the diameter of the hole 16 is smaller than the wavelength of the laser beam. The prior art device of Figure 1 employs magnetic means to record data bits on a recording layer 23 provided with a suitable medium for recording magnetic data bits as indicated by the direction of the arrow. An extremely thin protective layer 22 is formed on the recording layer 23 . A liner layer 24 is...

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Abstract

A data storage (40) unit having a data storage layer (42) with multiple storage areas (45) having a medium disposed thereon that changes between a plurality of states for writing and reading information thereon includes an array of light emitters (43), such as laser light probes or near-field light sources, spaced in close proximity to the data storage layer (42) for selectively directing light beams (46) to the data storage layer during write and read phases. Data is stored by directing a first light beam (46) to the medium to change to a state representative of data. Data is read by exciting the storage areas with a second directed light beam (46) on the medium. Alternately, the light energy beams in the write or read phases may be generated by a near-field optical system generating evanescent fields. The medium generates electron-hole pairs having substantially different activity in each storage area (45), depending upon its state. The electron-hole pairs generate activity in a detection region (41) in communication with the storage area (45) that is measured to detect the presence of data.

Description

technical field [0001] The invention relates to the field of information storage. More specifically, the present invention relates to information storage for writing and reading data in several new types of information storage media using beam emitter arrays or near-field light sources. technical background [0002] Electronic devices such as handheld computers, digital cameras, and cellular telephones are becoming more compact and smaller, even as they contain more complex data processing and storage circuits. Also, digital communications of all kinds other than text have become more prevalent, such as video, audio and graphics, which require enormous data volumes to convey the inherently complex information within them. These advances have created a huge demand for new memory technologies that can handle more complex data at lower cost and in more compact packages. [0003] One response to this need has been the development of ultra-high density memory devices, as descri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B9/12G11B7/004G11B7/135G11B7/24035G11B7/243G11B7/2433G11B9/08G11B11/08G11B11/12
CPCG11B11/12G11B11/08G11B9/08
Inventor G·A·吉布森A·蔡肯
Owner HEWLETT PACKARD CO