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Optical scanning device

A technology of optical scanning and optical recording, applied in optics, beam guiding devices, optical components, etc., can solve the problems of wasted radiation, obvious scattering, etc.

Inactive Publication Date: 2006-05-10
CP MAHK JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such diffractive structures are difficult to fabricate and are wasteful of radiation since they result in significant amounts of scattering

Method used

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  • Optical scanning device
  • Optical scanning device
  • Optical scanning device

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Embodiment Construction

[0018] Figure 1 is a schematic diagram of common parts of an apparatus for scanning an optical record carrier 1 according to an embodiment of the invention. As will be described below by way of example, in this embodiment the record carrier 1 is an optical disc.

[0019] The optical disc 1 comprises a transparent layer 2, on one side of which at least one information layer 3 is arranged. The side of the information layer facing away from the transparent layer is protected from environmental influences by the protective layer 4 . The transparent side facing the transparent layer of the device is the disk inlet face 5 . The transparent layer 2 serves as a substrate for the optical disc by providing mechanical support for the information layer or layers. Alternatively, the transparent layer 2 may have the sole function of protecting the information layer 3, while the mechanical support is provided by a layer on the other side of the information layer, for example by a protectiv...

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Abstract

An optical scanning device for scanning an optical record carrier with radiation of a selected wavelength, the device comprising an objective lens having an axial and a radial and a phase structure which is aperiodic with respect to the radial direction, the aperiodic The phase structure is arranged to compensate for coma, which aberration occurs in the objective lens when an optical record carrier is read in a non-axial direction relative to the objective lens; thereby providing the objective lens with improved viewing field.

Description

technical field [0001] The invention relates to an optical scanning device comprising an optical objective lens and to an optical element comprising the objective lens. More particularly but not exclusively, the invention relates to an optical scanning device capable of writing to and / or reading from an optical record carrier, such as a digital versatile disc, with relatively large field tolerances by using a single optical objective system (DVD). The field tolerance of the lens is defined by the coma aberration introduced in the off-axis part of the field. Background technique [0002] Objectives with relatively large field tolerances are ideal for use in scanning devices that allow multi-track readout and / or radial tracking in which the position of the beam spot varies according to the objective. For multi-track readout of DVDs, an objective lens with a numerical aperture (NA) of at least NA=0.6 and a large field tolerance is required. Using standard glass replication t...

Claims

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Application Information

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IPC IPC(8): G11B7/135G11B7/125G02B5/18G11B7/1374G02B13/00G02B27/00G11B7/00
CPCG02B27/0031G02B27/0037G02B27/4238G11B7/1367G11B7/1374G11B7/13922G11B2007/0006G11B7/1353G11B7/1392
Inventor B·H·W·亨德里克斯J·E·德弗里斯
Owner CP MAHK JAPAN
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