Method and device for reading digital color CD
A reading device, color technology, applied in the direction of beam guiding device, recording/reproducing with optical method, beam source, etc., can solve the problems of difficult coordinated control of multiple lasers, complex structure of light combining and splitting devices, etc., to achieve improved reading Acquisition rate and storage capacity, the effect of simple structure
Inactive Publication Date: 2006-06-07
TSINGHUA UNIV
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[0011] In order to solve the problem that the structure of light combining and splitting devices in the existing digital color disc reading device is complicated, and the multi-laser is difficult to coordinate and control, the present invention provides a method and device for digital color disc reading
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[0027] Below in conjunction with accompanying drawing, further illustrate the present invention.
[0028] Such as figure 2 As shown, the structure of the digital color optical disc is composed of a disc base 60 , a color recording layer 61 , a reflective layer 62 and a protective layer 63 . The color recording layer has absorption peaks respectively λ 1 , lambda 2 ,...λ n Composed of materials, the total thickness of the film is less than the focal depth of the objective lens. The writing point and non-writing point on it are respectively for the wavelength λ 1 , lambda 2 ,...λ n The absorptivity of light is different when the wavelength is λ 1 , lambda 2 ,...λ n When the synthesized white light is read, the white light returns from the surface of the optical disc that has recorded data information, and the returned light of various wavelengths has corresponding modulation signals, so that information can be read from the corresponding photodetectors.
[0029] Such ...
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The reading method and apparatus of digital colored CD belong to the CD information-storing field. This invention discloses the reading method and apparatus of digital colored CD. It adopted the white light LED-illuminating source, shaping collimating mirror, color-splitting prisms, filtering slice, and achromatic objective structure. It focus the parallel light beam from the white light LED illuminating source to the digital colored CD through the achromatic objective to realize the reading process. This invention avoids the coordination difficulty of light waves with several frequencies in different laser, and it needs no light combination apparatus. The structure of reading device is simple. The reading device can also read the digital colored CD in parallel mode, and increase the CD data reading speed and storage capacity. íí
Description
technical field [0001] The invention belongs to the field of optical disk information storage, and relates to a reading method of a digital color optical disk and a structural design of an optical head. Background technique [0002] With the development of science and technology, the storage capacity of information data is required to be larger and the access speed is required to be faster and faster. At present, there are many means in information data storage and distribution, among which CD-ROM is undoubtedly the most effective. Traditional read-only optical discs use pits along the spiral track on the surface of the optical disc to record information and data. The data capacity is relatively small and the access speed is relatively slow. Increasing the storage dimension of a single-chip optical disc, and changing the binary storage signal into a grayscale or color signal are effective methods to increase the optical storage capacity. For example, four multilayer storag...
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IPC IPC(8): G11B7/135G11B7/125G11B7/126G11B7/1365
Inventor 徐端颐宋洁齐国生佘鹏沈全洪
Owner TSINGHUA UNIV