Unlock instant, AI-driven research and patent intelligence for your innovation.

Optical-head device

An optical head and beam light technology, which is applied in the directions of beam guiding devices, optical recording heads, beam sources, etc., can solve the problems of increased adjustment cost and decreased reliability.

Inactive Publication Date: 2002-02-27
SANKYO SEIKI MFG CO LTD
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem of causing an increase in adjustment costs and a decrease in reliability

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical-head device
  • Optical-head device
  • Optical-head device

Examples

Experimental program
Comparison scheme
Effect test

no. 2 Embodiment

[0066] In the above-described first embodiment, the light guiding optical element 5 is arranged on the optical path from the objective lens 40 to the light receiving element 13 . But you can also not configure this way, instead of Figure 7 As shown, it is arranged on the optical path from the first laser light source 11 and the second laser light source 12 to the beam splitter 30 that guides the first laser light L1 and the second laser light L2 to the objective lens 41 .

[0067] In this case, the relative angle between the first laser beam L1 and the second laser beam L2 is changed by the light guiding optical element 5, so that the first laser beam L1 and the second laser beam L2 can be emitted as parallel lights whose optical axes coincide with each other. The surface is emitted and guided to the common objective lens 41. As a result, the return lights Lr1 and Lr2 of the first and second laser beams whose optical axes coincide with each other can be received by the commo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Provided is a small and inexpensive optical element for light guiding for a double wavelength optical head device used for aligning the optical axis of each laser beam and guiding each laser beam to a common photodetector. The optical element (5) to guide a first and second laser beams (L1) and (L2) whose optical axes are deviated to the common photodetector (3) consists of a resin molding and provided with a discoid main body (51), an incident plane (52) formed so as to have one stepped surface and a flat light-emitting surface (53) perpendicular to an optical axis (5a) formed on the other surface. The difference in level of the adjacent stepped surface (54) which constitutes the stepped surface of the incident plane (52) is one wavelength of optical path difference only when a return laser beam (Lr1) passes. The return laser beam (Lr1) passes the element (5) without being deflected in the traveling direction. A return laser beam (Lr2) is deflected at a prescribed angle when passing the optical element (5) for light guiding, and condensed on the same position as that of the return laser beam (Lr1) on the common photodetector.

Description

technical field [0001] The present invention relates to a dual-wavelength optical head device used for recording and reproducing optical recording media such as CD (Compact Disc) and DVD (Digital Video Disc). More specifically, it relates to an optical element for guiding light used in such a dual-wavelength optical head device. The optical element for guiding light is used to adjust the relative angles of lights of different wavelengths emitted from light sources at different positions of light-emitting points. Change the optical axes of these lights to combine, or guide these lights to a common light-receiving element. Background technique [0002] As optical recording media, recording media having different substrate thicknesses and recording densities, such as CDs and DVDs, are known. In order to record and reproduce information on these recording media, laser beams of different wavelengths must be used. For example, DVD playback requires a laser with a wavelength of 65...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/18G02B5/30G11B7/125G11B7/127G11B7/135G11B7/1362G11B7/1367G11B7/1381G11B7/1395
CPCG11B7/1381G11B7/1362G11B7/1367G11B2007/0006G11B7/127G11B7/1395
Inventor 武田正
Owner SANKYO SEIKI MFG CO LTD