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

Optical head and disk reproducing apparatus

An optical head and replay technology, which is applied in the direction of optical recording head, beam guiding device, etc., can solve the problems of cost increase and enlargement, and achieve the effect of miniaturization, reduction of the number of accessories, and reduction of errors

Inactive Publication Date: 2009-04-22
SHARP KK
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, in the optical head 1 disclosed in Japanese Unexamined Patent Application Publication No. 2003-296960, since the phase compensating element 7 is mounted, the cost is higher than that of an optical head that does not use the phase compensating element, and there are problems of increasing the size.

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 and disk reproducing apparatus
  • Optical head and disk reproducing apparatus
  • Optical head and disk reproducing apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0062] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0063] figure 1 It is a side view showing the structure of the optical head 21 which is one embodiment of this invention in simplified form. The optical head 21 includes: a semiconductor laser element 22 , a grating 23 , an optical element 24 , a scattering angle adjustment element 25 , an objective lens 26 , a Wollaston prism 27 , and a photodetector 28 .

[0064] The optical head 21 of the present embodiment is characterized in that the optical element 24 is arranged on the optical path of the return light (return light) between the objective lens 26 and the photodetector 28, and the optical element 24 includes: a light separation part 30 for separating The outgoing light (outgoing light) and the returning light; and the phase compensation glass 31 as a phase compensating portion imparts phase compensation to the incident light.

[0065] I...

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

There is provided an optical head which have no such problems regarding increase in cost and size thereof and can reduce errors by suppressing crosstalk components attributable to reflection on lands of a magneto-optical recording medium and thereby prevent degradation of reproduction characteristics. An optical element (24) includes a light separating section (30) for separating outgoing light and return light, and a phase compensation section (31) for imparting phase compensation to light incident thereon. The optical element (24) is provided on a light path of return light between an objective lens (26) and a photodetector (28), so as to be closer to the photodetector than the light separating section is. This makes it possible to impart the phase compensation to the return light and prevent the degradation of reproduction characteristics. Light separating elements such as beam splitter are no more necessary in the configuration, with the result that decreases in size and cost can be realized.

Description

technical field [0001] The invention relates to an optical head and a disk playback device. Background technique [0002] Disc reproduction devices include devices capable of recording and / or reproducing various magneto-optical recording media with different physical formats, for example, MD (Mini Disc: registered trademark) and Hi-MD (registered trademark). The optical head of the disc playback device that at least performs playback of the various magneto-optical recording media includes: a light source that emits laser light; an objective lens that condenses the laser light emitted from the light source onto the information recording surface of the magneto-optical recording medium; The optical system separates the laser light reflected by the information recording surface of the magneto-optical recording medium as loop light; and the signal conversion unit converts the laser light separated by the optical system into an electric signal. [0003] In magneto-optical recordi...

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 Patents(China)
IPC IPC(8): G11B7/12G11B7/135
Inventor 古屋贵昭田中贤一
Owner SHARP KK