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Optical pickup apparatus, and optical recording and replay apparatus

A technology of optical pickup and optical components, applied in the field of optical systems

Inactive Publication Date: 2009-01-28
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reducing the diameter of the pinhole also results in a loss of the signal light component incident on the detector

Method used

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  • Optical pickup apparatus, and optical recording and replay apparatus
  • Optical pickup apparatus, and optical recording and replay apparatus
  • Optical pickup apparatus, and optical recording and replay apparatus

Examples

Experimental program
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Embodiment Construction

[0095] The invention will be described in detail based on the embodiments shown in the drawings.

[0096] FIG. 1 is a schematic diagram showing an optical disc device 20 according to an embodiment of the present invention.

[0097] For example, the optical disc device 20 includes, a spindle motor 22 functioning as a motor for driving the rotation of the optical disc 15, an optical pickup device 23, a seeker for driving the optical pickup 23 in a sledge direction. Motor 21, laser control circuit 24, encoder 25, drive control circuit 26 (including, for example, motor driver 27 and servo controller 33), reproduced signal processing circuit 28, buffer RAM 34, buffer manager 37, interface 38, flash memory Memory (or ROM) 39 , CPU 40 , and RAM 41 . The arrows depicted in FIG. 1 indicate exemplary flows of signals and information, but not all connections among the described components (blocks). Furthermore, the optical disc device 20 according to the embodiment of the present inven...

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Abstract

The present invention discloses an optical system for extracting signal light components from a beam including the signal light components and stray light components. The optical system includes a condensing optical element situated on an optical path of the beam for condensing the beam, a polarization changing unit for changing the state of polarization of at least one of the signal light components and the stray light components included in the incident beam transmitted through the condensing optical element, and an extracting element for extracting the signal light components included in the beam transmitted through the polarization changing unit.

Description

[0001] This application is a divisional application of a patent application with an application date of March 2, 2006, an application number of 200680000238.8, and an invention title of "Optical System, Optical Pickup Device, and Optical Disk Device". technical field [0002] The present invention relates to an optical system, an optical pickup device, and an optical disc device, and more particularly to an optical system for extracting a signal light component from a light beam, an optical pickup device including the optical system, an optical disc device including the optical pickup device, and an optical recording and reproduction devices. Background technique [0003] In recent years and continuously, due to the development of digital technology and the improvement of data compression technology, optical discs (for example, CD (Compact Disc) and DVD ( Digital versatile disks)) are gaining more attention. Therefore, as optical discs have become inexpensive, optical disc ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/135G11B7/005G11B7/1353G11B7/1356G11B7/1367G11B7/1381G11B7/1395
Inventor 小形哲也
Owner RICOH KK