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Optical pickup

A pickup, optical technology, applied in optical recording heads, instruments, recording/reproducing by optical methods, etc., can solve the problems of tracking error, influence, reproduction and poor recording information, and achieve high-quality reproduction and recording of information. Effect

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

This is the state in which the so-called tracking error signal shift occurs, which causes a tracking error in which the beam spot follows a position moved from the center of the track, resulting in adverse effects on reproduction and recording information

Method used

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  • Optical pickup
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Embodiment Construction

[0019] Now, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the overall structure of an optical pickup that supports recording and reproducing information on BD (Blu-ray Disc), DVD, and CD according to an embodiment of the present invention.

[0020] The above optical pickup includes a laser diode 1 for BD, a dichroic prism 2, a laser diode 3 for DVD and CD, a polarizing beam splitter 4, a photodetector 5, a collimating lens 6, a mirror 7, a holographic Element 8 , wavelength selection diaphragm 9 , liquid crystal element 10 , objective lens 11 for BD, lens holder 12 , liquid crystal driver IC 13 , and actuator 14 .

[0021] A hologram element 8 , a wavelength selective aperture 9 , a liquid crystal element 10 and a liquid crystal driver IC 13 are mounted on a lens holder 12 together with an objective lens 11 for BD. The lens holder 12 is secured by a pickup base (not shown) via a plurality of suspension wires (not shown). ...

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Abstract

An optical pickup includes a light source, an objective lens for condensing a light beam emitted from the light source on a disk, a hologram element for splitting the light beam reflected by the disk, a photo detector for receiving the split light beam, a holding element for holding the objective lens and the hologram element, and an actuator for driving the holding element, the objective lens and the hologram element as one unit to shift in a tracking direction.

Description

technical field [0001] The present invention relates to a structure of an optical pickup for reproducing and recording information on an optical disc. Background technique [0002] An optical disc drive for reproducing and recording information on an optical disc such as a CD, DVD, or Blu-ray Disc (hereinafter referred to as BD) performs tracking servo, a control for making a beam spot follow a track on the optical disc. [0003] For example, JP-A-2005-158102 discloses an optical pickup for a conventional optical disc drive capable of reproducing and recording information on all types of high-density DVDs, DVDs and CDs. In this optical pickup, before the laser beam emitted by the laser diode LD1 for high-density DVD is focused onto the disc by the objective lens OBL, the spherical aberration of the laser beam is corrected by the liquid crystal element LCD, and its coma Aberrations are corrected by the insulating substrate SUB. The laser beam is reflected by the optical dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/12G11B7/135G02F1/133
CPCG11B7/1369G11B7/0903G11B7/1353
Inventor 高桥和浩上冈优一池田笃史
Owner FUNAI ELECTRIC CO LTD