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Optical pickup device

A technology of optical pick-up device and light source, which is applied in the direction of beam guiding device, optics, optical components, etc., and can solve the problems of increasing the number of components and increasing the adjustment load, etc.

Inactive Publication Date: 2007-05-23
FUNAI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the three beam types are suitable for an optical pickup capable of emitting multiple beams with different wavelengths, the adjustment load will increase
In addition, since a diffraction grating needs to be prepared for each light source, the number of parts may increase

Method used

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Embodiment Construction

[0024] Now, embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiment shown here is only an example, and thus the present invention is not limited to the embodiment shown here.

[0025] FIG. 1 is a diagram showing the general configuration of the optical system of the optical pickup device according to the present embodiment. Reference numeral 1 is an optical pickup device capable of reading recording surfaces 11a recorded on three types of optical recording media 11 including CD, DVD, and BD by projecting a beam of light toward the optical recording medium 11 and receiving reflected light. information on . This optical pickup device is also capable of writing information on the recording surface 11 a by projecting a light beam to the optical recording medium 11 . This optical pick-up device 1 is provided with the double-wavelength compound light source 2 that can emit light beams with two different waveleng...

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Abstract

The optical pickup device (1) includes a two-wavelength compound light source (2) that is capable of emitting two light beams having different wavelengths and a light source (3) emitting a single wavelength light beam. The laser beam emitted from the latter single wavelength light source (3) has an optical path length different from that of the laser beam emitted from the former two-wavelength compound light source ( 2 ). The optical pickup device (1) is equipped with a hologram element ( 8 ). One of the surfaces (8a) of the hologram element (8) has a lens effect for compensating the difference between the optical path lengths of the laser beams emitted from the single wavelength light source (3) and the two-wavelength compound light source (2). The other surface (8b) of the hologram element (8) has an optical control function for enabling generation of a servo signal.

Description

technical field [0001] The present invention relates to an optical pickup capable of recording information on an optical recording medium or reading information recorded on the optical recording medium using a light source that emits light toward a recording surface of the optical recording medium. In particular, the present invention relates to a structure of an optical pickup device including a plurality of light sources having different wavelengths. Background technique [0002] As the optical recording medium, various types of media are available, including compact disc (hereinafter referred to as CD), digital versatile disc (hereinafter referred to as DVD), and recently introduced Blu-ray Disc (hereinafter referred to as DVD), which is a medium with a large storage capacity. for BD) etc. In order to read information recorded on these optical recording media or write information on these optical recording media, an optical pickup device is used. As an optical pickup de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/135G11B7/09G02B5/32
CPCG11B7/0912G11B7/0901G11B7/131G11B7/1275G11B2007/0006G11B7/1353
Inventor 池田笃史长岛贤治高桥和浩
Owner FUNAI ELECTRIC CO LTD