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Optical read-write head and CD device using same

A technology of read-write head and conversion device, which is applied in the direction of integrated optical head device, laser device, beam guiding device, etc., which can solve the problems of increasing the cost of optical components and achieve the effect of reducing aberration

Inactive Publication Date: 2004-06-30
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in the above-mentioned prior art, it is necessary to provide a dedicated holographic optical element, polarizing prism (double refraction plate) etc. so as to only bend the optical path of the laser beam of the wavelength 780nm of the existing CD and the laser beam of the wavelength 660nm of the existing DVD bundle has no effect
This increases the cost of the optics of the optical read / write head

Method used

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  • Optical read-write head and CD device using same
  • Optical read-write head and CD device using same
  • Optical read-write head and CD device using same

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Embodiment Construction

[0035] An optical pickup and an optical disc device using the same will now be described with reference to the accompanying drawings.

[0036] figure 1 is the structure of an embodiment of the optical disc device according to the present invention. figure 1 (a) is a top view. figure 1 (b) is viewed from the direction of arrow B figure 1 (a) Side view. figure 1 (c) is viewed from the direction of arrow B figure 1 (a) Side view. exist figure 1 In (a)-1(c), the same reference numerals represent the same elements. The figure shows an optical disc 2, which means a CD-ROM disc or a CD-R disc with a base thickness of about 1.2 mm, using laser light with a wavelength of 780 nm for recording and playback. Alternatively, the optical disc 2 may be a DVD disc with a base thickness of about 0.6 mm, using a laser with a wavelength of 660 nm for recording and playback. A motor 3 is installed on the optical disc device 1 to provide a rotating shaft 4 to rotate the optical disc 2 . Th...

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Abstract

In optical heads with multiple semiconductor laser chips with different wavelengths, coma aberrations generated by laser beams projected at an angle relative to the entry axis of a focus lens is reduced. To achieve this, a beam-shaping upward prism having dispersion characteristics is disposed on the entry side of the focus lens. The semiconductor laser chip with the longer wavelength is positioned closer to a line extending a refracted beam resulting from refraction.

Description

technical field [0001] The present invention relates to an optical read / write head and an optical disc using it to record optical information to or play back information from an optical information medium such as an optical disc. More particularly, the present invention relates to an optical pickup and an optical disc using the same, which can record information using a laser module in which semiconductor lasers having different wavelengths are installed. Background technique [0002] In an optical information recording / playback device such as an optical disc device, various characteristics are desired in addition to compactness and thinness. [0003] For example, an obvious requirement for using a single compact optical head is that it can record and play back CD-R (Compact Disc Rewritable, whose use is rapidly expanding as a rewritable disc medium) and DVD-RAM (Digital Versatile Disc / Digital Video Disc, a recently developed optical disc medium capable of high-density rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/04G11B7/09G11B7/12G11B7/123G11B7/125G11B7/127G11B7/13G11B7/131G11B7/135G11B7/1359G11B7/1392H01S5/40
CPCG11B7/0908G11B7/1359G11B7/0901G11B7/0916G11B7/131G11B7/13922G11B7/094G11B7/123G11B7/127
Inventor 中村滋有川康之重松和男
Owner HITACHI LTD