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Optical pickup, and method and appts. for correcting aberration of optical beam

A beam and aberration technology, applied in beam guiding devices, recording/reproducing by optical methods, optics, etc., can solve the problems of incompatibility of the pickup, large space, and large lens driving amount, etc.

Inactive Publication Date: 2006-10-11
PIONEER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, using an extended lens is incompatible with making the entire pickup compact
[0013] In addition, in figure 2 In the pickup structure shown, the entire collimator lens must be moved, making the amount of lens driving required to correct spherical aberration large
As a result, the space required for such driving of the collimating lens is forced to be relatively large
In addition, the collimating lens needs to be moved over a longer distance, resulting in a longer correction time and increased energy consumption

Method used

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  • Optical pickup, and method and appts. for correcting aberration of optical beam
  • Optical pickup, and method and appts. for correcting aberration of optical beam
  • Optical pickup, and method and appts. for correcting aberration of optical beam

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Embodiment Construction

[0030] Next, preferred embodiments of the spherical aberration correcting method and unit of the present invention will be described with reference to the accompanying drawings.

[0031] In the following embodiments, the object to be detected is a high-density optical disc, and the present invention is applied to an optical pickup that irradiates a light beam toward the object, and includes an aberration correction unit for correcting spherical aberration of the light beam.

[0032] The optical disc DK as an object undergoes recording and reproduction of information thereon. The optical disc DK has a substrate on which a recording layer is formed, and an information signal is recorded in the recording layer based on phase change. On this recording layer, a cover layer is formed to have a thickness of, for example, about 0.1 mm. This cover layer functions as a protective layer for protecting the recording layer. This allows light to enter the optical disc DK for recording and...

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Abstract

The invention discloses a spherical aberration correction unit (9, 11, 13) correcting aberrations caused in a light beam (B) irradiated towards and focused on an object to be detected (DK). The correction unit includes an aberration corrector (9), a driver (12), a light receiver (11) and a controller (13). An aberration corrector composed of a plurality of optical elements (9a, 9b) forms the beams into parallel beams and corrects aberrations caused in the beams. The driver drives any one of the optical elements along the direction of the optical axis of the light beam. The light receiver receives light reflected from the medium to generate a light reception signal from the received light, and the controller controls the driver based on the generated light reception signal.

Description

technical field [0001] The invention relates to a method and a device for correcting aberrations caused in a light beam focused on an object to be detected, and to an optical pickup for use with the correction device. Background technique [0002] Generally, an optical pickup is employed by an information recording medium. In this optical pickup field, as the spot diameter of the light beam emitted from the optical pickup and focused onto the information recording medium decreases, the density of recording or reproduction pieces of information becomes greater. The diameter of the spot becomes smaller as the wavelength of light becomes shorter and the numerical aperture (NA) of the objective lens becomes larger. [0003] Therefore, in order to increase the storage capacity of the optical recording medium, it is necessary to install a semiconductor laser (LD) emitting a beam of shorter wavelength as a light source in the optical pickup, and to use an objective lens with a lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/135G02B7/00G11B7/09G02B27/00G11B7/125G11B7/1372G11B7/1376G11B7/1378G11B7/1392
CPCG11B7/0937G11B7/1376G11B7/1378G11B7/13927G11B2007/13727
Inventor 菊池育也大滝贤
Owner PIONEER CORP