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Optical pickup device

An optical pickup device, laser technology, applied in the direction of beam guiding device, optics, optical components, etc., can solve the problems of inability to read information, movement requires additional time and energy, etc., to shorten the focusing time, shorten the time used for track tracking, etc. The effect of adjusting time and reducing energy consumption

Inactive Publication Date: 2004-09-15
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that extra time and energy are required to move the information recording and reproducing device 502
[0012] And, in the existing optical pick-up device 501, the focus distance of each laser beam in the occasion of generating a plurality of laser beams can only be fixed with the physical arrangement of each constituent element, or can only change all the laser beams 514 at the same time through the diffraction grating 509. focal interval
Therefore, for example, in the optical pick-up device of 3 light beams, 2 light beams can be focused on the focus position on the recording track, but the focus position of the 3rd light beam cannot be controlled separately. In addition to the technology that can read and write even if the focus of the sensor is not on the recording track, there is a problem that the information of the third beam cannot be read

Method used

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Embodiment Construction

[0044] (Embodiment 1)

[0045] figure 1 It is a configuration diagram showing the optical pickup device according to Embodiment 1 of the present invention. The optical pickup device 27 includes an information recording and reproducing device 20 , a control circuit 15 , and a drive device 12 . The information recording and reproducing device 20 is composed of a transparent piezoelectric element such as crystal, and has the following equipment: the objective lens 13 whose shape changes by applying an electric field, and the object lens 13 which is used to apply a voltage and is arranged on the surface of the objective lens 13. A plurality of transparent electrodes 16, a laser emitting / receiving device 8 that receives the return light from the optical disc 3 through the objective lens 13 while irradiating the laser light 1 on the optical disc 3 through the objective lens 13, and obtains a reproduction signal from the received return light , reflecting the light emitted from th...

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Abstract

An optical pickup device capable of implementing focusing and tracking adjustment in a short time and with energy saved, and being simplified in a drive mechanism, wherein an object lens (13) consisting of a transparent piezoelectric element to be deformed on application of an electric field is used, and a control circuit (15) is used to deform its shape on application of an electric field to thereby adjust the focus position of a laser beam.

Description

technical field [0001] The present invention relates to an optical pickup, and more particularly to an optical pickup for recording or reproducing information on an optical disc. Background technique [0002] In recent years, applications of optical discs capable of recording a large amount of information at high density are progressing in many fields. The optical disc is an optical information recording medium that records or reproduces information through non-contact and has excellent characteristics of media exchange. It is particularly attractive as an optical disc file and an external storage medium for a computer. [0003] Such an optical disk can record or reproduce information by an optical pickup using a semiconductor laser, and can delete or rewrite the recorded information depending on the medium used. [0004] Figure 21 It is a conceptual diagram showing the configuration of a conventional optical pickup device. The optical pickup device 500 includes an inform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/085G11B7/09G11B7/135
CPCG11B7/1374G11B7/1362G11B7/0937G11B7/08564G11B2007/0006G11B7/00G11B7/09
Inventor 小本阅
Owner PANASONIC CORP