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

Optical pickup

An optical pickup, beam technology, applied in the direction of optical recording head, optical recording/reproduction, beam source, etc., can solve problems such as characteristic deterioration, and achieve the effect of assembly adjustment and low cost

Inactive Publication Date: 2006-06-07
SHARP KK
View PDF3 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in an optical pickup with a plurality of light sources, when one phase shift grating is used for multiple beams with different numerical apertures, or when the positions and wavelengths of beams on the grating are changed, the The push-pull signal of one of the sub-beams has the problem of degraded characteristics

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 pickup
  • Optical pickup
  • Optical pickup

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0063] Hereinafter, the present invention will be described in more detail based on embodiments and comparative examples, but the present invention is not limited thereto.

[0064] [Embodiment 1]

[0065] The following according to Figure 1 to Figure 11 One embodiment of the present invention will be described.

[0066] As shown in Fig. 2 (a) and Fig. 2 (b) as the pick-up device of the optical pickup of this embodiment, have generation as the light beam of the wavelength λ1 of the 1st wavelength and as the light beam of the wavelength λ2 of the 2nd wavelength. A single-component light source 1 for a kind of light beam, a grating 3 as a grating forming a three-beam beam for dividing the light beam emitted by the light source 1 into a main beam and two sub-beams, and an objective lens 5 for focusing the divided three-beam optical disc 6 , and the photodetector 8, which is a photodetector that detects a push-pull signal from the respective reflected lights of the three beams, ...

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

The grating (3) is to be endowed with a pattern that produces partial phase shifts for the light beams of the wavelength (λ1) and the light beams of the wavelength (λ2), and there is a region (B1, B1, B2). The pattern for generating the phase shift is set such that the amplitude of the push-pull signal of the sub-beam is substantially canceled for any of the beams having different wavelengths. In the optical pick-up head with multiple light sources in the same component, when using three beams to detect any kind of optical discs such as DVD series and CD series, it is possible to reduce the cost, simplify the assembly adjustment and simplify the pick-up head.

Description

technical field [0001] The present invention relates to an optical pick-up head for optically recording and reproducing information on information recording media such as optical discs. In particular, it relates to an optical pickup capable of easily and at low cost correcting offsets occurring in tracking error signals when an optical pickup having a plurality of light sources having different wavelengths performs tracking servo. Background technique [0002] In recent years, since optical discs can record a large amount of information signals at high density, they have been widely used in many fields such as audio equipment, video recorders, and computers. [0003] In an information recording medium such as an optical disk as described above, in order to reproduce an information signal recorded in units of micrometers, it is necessary to make the light beam follow the information track accurately. Various methods are known for detecting the tracking error signal (TES: Tra...

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): G11B7/09G11B7/00G11B7/125G11B7/1275G11B7/135G11B7/1353G11B7/1381
CPCG11B7/0903G11B7/094G11B7/1275G11B7/1353G11B7/1381G11B2007/0006
Inventor 渡边由纪夫上山徹男
Owner SHARP KK
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com