Optical head device and optical information device

An optical head device and information recording technology, which is applied in the direction of optical recording head, beam guiding device, information storage, etc., can solve the problems of increasing the number of components, difficulty in realizing device miniaturization, and difficulty in reducing costs

Inactive Publication Date: 2008-06-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in this structure, it is necessary to provide two types of objective lenses suitable for different optical discs and an optical system independent of the objective lenses, so the number of components increases, making it difficult to miniaturize the device and reduce the cost.

Method used

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  • Optical head device and optical information device
  • Optical head device and optical information device
  • Optical head device and optical information device

Examples

Experimental program
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no. 1 example

[0018] First, an optical head device according to a first embodiment of the present invention will be described with reference to FIG. 1 . FIG. 1 is a schematic diagram showing the configuration of an optical head device according to a first embodiment of the present invention.

[0019] The optical head device shown in Fig. 1 comprises, light source 1, polarizing beam splitter (polarization beam splitter) 2, collimator lens (collimator lens) 3, photodetector 4, wavelength plate (wave plate) 7,8, objective lens 31 , 32 and prism 53 . In addition, the optical disc 21 is a BD with a protective layer thickness of about 0.1 mm, the optical disc 22 is an HD-DVD with a protective layer thickness of about 0.6 mm, the optical disc 23 is a DVD with a protective layer thickness of about 0.6 mm, and the optical disc 24 is a protective layer with a thickness of about 0.6 mm. It is a 1.2 mm CD, and each of the optical discs 21 to 24 is an information recording medium having a track on whic...

no. 2 example

[0036] Hereinafter, an optical head device according to a second embodiment of the present invention will be described with reference to FIG. 2 . FIG. 2 is a schematic diagram showing the configuration of an optical head device according to a second embodiment of the present invention. The difference between the optical head device shown in FIG. 2 and the optical head device shown in FIG. 1 is that two light sources 101, 102 and two polarized beam splitters 201, 202 are used instead of one light source 1 and one polarized beam splitter. The beam mirror 2 is the same as the optical head device shown in FIG. 1 in other points, so the same symbols are assigned to the same parts, and detailed description thereof will be omitted.

[0037] The light source 101 emits laser light with a wavelength of 405 nm, and the polarized beam splitter 201 reflects the laser light from the light source 101 , and guides the laser light into the collimator lens 3 through the polarized beam splitter ...

no. 3 example

[0041] Hereinafter, an optical head device according to a third embodiment of the present invention will be described with reference to FIG. 3 . 3 is a schematic diagram showing the configuration of an optical head device according to a third embodiment of the present invention. The difference between the optical head device shown in Figure 3 and the optical head device shown in Figure 2 is that three polarized beam splitters 203, 204, 205 and two photodetectors 401, 402 are used to replace two polarized light beams The beam splitters 201, 202 and one photodetector 4 are the same as the optical head device shown in FIG. 2 in other points, so the same reference numerals are assigned to the same parts, and detailed description thereof will be omitted.

[0042] The laser beam with a wavelength of 405 nm from the light source 101 is reflected by the polarizing beam splitter 203 and guided into the collimator lens 3 by the polarizing beam splitter 204 . The action between the coll...

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Abstract

The invention provideds an optical head device and an optical information device. The optical head device is provided with a light source (1) for emitting a plurality of types of light having different wavelengths; an objective lens (31) for focusing a light spot on an optical disc (21); an objective lens (32) for focusing light spots on optical discs (22-24); and a prism (53) which separates the laser beam having a wavelength of 405nm from the light source (1) into transmitting light and reflecting light, guides the reflecting light to the objective lens (31) and the transmitting light to the objective lens (32), and guides the laser beams having wavelengths of 660nm and 780nm from the light source (1) to the objective lens (32).

Description

technical field [0001] The present invention relates to an optical head device for recording and / or reproducing information on an information recording medium such as an optical disc or an optical card, and an optical information device using the optical head device. Background technique [0002] Currently, as optical discs, there are CDs and DVDs, and BD (Blu-ray Disc) or HD-DVDs that further realize high-density recording using blue laser light. Therefore, there is a need for an optical head device compatible with recording and reproduction of optical discs having different specifications as described above. As such a device, there is, for example, an optical head device disclosed in Japanese Patent Laid-Open Publication No. Hei 11-120587 (hereinafter referred to as "Patent Document 1"). Its structure is that by installing two types of objective lenses and optical systems suitable for DVD and CD, and objective lenses and optical systems suitable for BD, etc., in one optic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/135G11B7/125
CPCG11B7/1356G11B7/1275G11B2007/0006
Inventor 安西穰儿爱甲秀树荒井昭浩中田秀辉山崎文朝金马庆明
Owner PANASONIC CORP
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