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Optical Pick-up device

An optical pick-up device and laser beam technology, applied in the direction of beam guiding device, beam source, optical detector, etc., can solve the problems of mass production cost, difficult device adjustment, complex structure, etc.

Inactive Publication Date: 2004-08-11
PIONEER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in this structure, since a synthesis prism and the like are required, a large number of parts are required and the production cost is also high
In addition, since the positions of the two laser devices and the combining prism must be matched, the structure becomes complicated and it is difficult to adjust the device

Method used

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Embodiment Construction

[0025] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] figure 2 The optical system of the optical pickup device according to the present invention is schematically shown. The optical pickup has a semiconductor laser device 111 for emitting laser beams of two different wavelengths. The semiconductor laser device 111 independently emits a first laser beam with a wavelength of 650 nm and a second laser beam with a wavelength of 780 nm from different light emitting points in the same emission direction. The interval L between the light emitting points is about 100 μm.

[0027] The optical pickup device is configured so that the laser beam emitted from the semiconductor laser device 111 passes through the collimator lens 112 and the objective lens 113 in order and reaches the optical disc 114 . DVDs and CDs (including CD-Rs) are used as the optical disc 114, and one of the used discs is placed on a tur...

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PUM

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Abstract

An optical pickup apparatus includes a semiconductor laser device having a plurality of light emitting portions for emitting laser beams having different wavelengths on a substrate for emitting a laser beam from one of the plurality of light emitting portions in response to a light emitter selecting instruction in the same emitting direction. The laser beam emitted from the semiconductor laser device is converged by an objective lens and led to a recording surface of an optical disk, and the objective lens is moved to one of a plurality of different positions in a radial direction of the optical disk, corresponding to the selected light emitting portion.

Description

technical field [0001] The present invention relates to an optical pickup device capable of emitting a plurality of laser beams of different wavelengths to read recorded information from various types of optical discs with different recording densities. Background technique [0002] Generally, a semiconductor laser device is used as a light source of an optical pickup device for playing back optical information recording media such as CDs and DVDs. [0003] In order to reproduce the recording medium, the numerical aperture (NA) and light emission wavelength of the objective lens of the semiconductor laser device for CD playback and DVD playback are different from each other. For example, in the case of DVD, the wavelength is equal to 650 nm and NA is equal to 0.6, while in the case of CD, the wavelength is equal to 780 nm and NA is equal to 0.45. [0004] Therefore, in order to play different types of optical discs such as CD, DVD, etc. using one optical disc player, an opt...

Claims

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Application Information

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IPC IPC(8): G11B7/00G11B7/085G11B7/09G11B7/125G11B7/127G11B7/13G11B7/131G11B7/135G11B7/1374
CPCG11B7/0925G11B7/1374G11B7/131G11B2007/0006G11B7/0945G11B7/08505G11B7/127
Inventor 石井耕高桥真一菅野光俊长竹浩克吉冈亚纪川村诚三浦章小山雅之
Owner PIONEER CORP
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