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Read-write equipment for digital colour three-layer multi-order CD

A read-write device and color technology, applied in beam guiding devices, optical recording heads, etc., can solve the problems of complex design, high difficulty in manufacturing, installation and debugging, and difficulty in improving storage dimensions, and achieve compact structure, simple manufacturing and debugging Effect

Inactive Publication Date: 2004-03-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1 DVD disc data is serially written and read by a single beam, and its reading and writing speed is difficult to improve
[0004] 2. At present, because each recording layer of the disc uses different transmittance and reflectance ratios, the recording layer can only be two layers, so it is difficult to increase the storage dimension
The above-mentioned technologies only involve light-combining or light-splitting components, and their design is complex, making it difficult to manufacture, install and debug

Method used

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  • Read-write equipment for digital colour three-layer multi-order CD
  • Read-write equipment for digital colour three-layer multi-order CD
  • Read-write equipment for digital colour three-layer multi-order CD

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specific Embodiment approach

[0014] The present invention includes three identical sub-optical systems, a light-combining and beam-splitting rectangular prism group 10 and an achromatic objective lens 5a. The three main optical axes of the sub-optical system are composed of lasers (1a, 1b, 1c, respectively), shaping collimating mirrors (2a, 2b, 2c), polarization beam splitters (3a, 3b, 3c) and 1 / 4 wave plate (4a, 4b, 4c) constitute. The laser is located at the focal point of the shaping collimator, and behind the shaping collimator is a polarization beam splitter, and the 1 / 4 wave plate is placed behind the polarization beam splitter; perpendicular to the main optical axis of each sub-optical system and in sequence along the beam splitting direction of the polarization beam splitter There are condenser mirrors (7a, 7b, 7c) and photodetectors (8a, 8b, 8c), respectively. The cylindrical lens 11 can be placed in any one of the three sub-optical systems, and its position can be placed between the condenser l...

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Abstract

A R / W device for three-layer multi-order colour DVD has three same optical sub-systems. The main light axises of two sub-systems are parallel and perpendicular to the light axis of the third sub-system. Three laser beams can be parallelly output to read or write on said DVD by use of lasers, shaping collimator, polarizing splitter, 1 / 4 wave plate, splicing-splitting right-angle prism set and a chromatic object lens structure. Its advantage include high R / W speed, and compact structure.

Description

technical field [0001] The invention belongs to the technical field of optical disc information storage, and in particular relates to the structural design of an optical head of a color digital multilayer optical disc. Background technique [0002] The storage capacity of information data is required to be larger and the access speed is required to be faster and faster. At present, most of the ultra-large-capacity data access uses methods such as optical disk libraries, optical disk towers, and disk arrays. However, the data capacity of a single optical disc or magnetic disk is relatively small and the access speed is relatively slow. Increasing the storage dimension of a single disc is an effective way to increase the optical storage capacity. For example, four multi-layer storage methods are used in Digital Versatile Disc-DVD, namely, single-sided single-layer, single-sided double-layer, double-layer Single-sided and double-sided double-layer. In the commercialized DVD ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/135
Inventor 齐国生麦雪松徐端颐赵辉
Owner TSINGHUA UNIV