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Scanning device including an objective system formed of a single material

A lens system, a single technology, used in the manufacture of optical heads, beam guides, recording/reproducing by optical methods, etc., can solve problems such as wavefront aberrations

Inactive Publication Date: 2007-02-07
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] This oblique incidence of light causes wavefront aberrations

Method used

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  • Scanning device including an objective system formed of a single material
  • Scanning device including an objective system formed of a single material
  • Scanning device including an objective system formed of a single material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] figure 2 Shown is an apparatus 1 for scanning an optical record carrier 2 comprising an objective lens 18 manufactured in accordance with an embodiment of the invention. The record carrier comprises a transparent layer 3 provided on one side with an information layer 4 . The side of the information layer facing away from the transparent layer is protected from environmental influences by a protective layer 5 . The side of the lens layer facing the device is called the entrance face 6 . The transparent layer 3 serves as the substrate of the carrier to provide mechanical support for the information layer.

[0038] In addition, when the mechanical support is provided by a layer on the other side of the information layer, for example by the protective layer 5 or by another information layer and a transparent layer connected to the information layer 4, the transparent layer may only have the function of protecting the information layer. Functions of the information layer...

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Abstract

An optical scanning device (1) for scanning an information layer (4) of an optical record carrier (2), the device (1) comprising a radiation source (11) for generating a radiation beam (12, 15, 20) and an objective system (18) for converging the radiation beam on the information layer, the information layer being covered by a transparent layer (3) of thickness td and refractive index nd. The objective system comprises a lens formed of a single material. The lens satisfies the condition: Fomula (I), where t is the thickness of the lens, FWD is the free working distance between the lens (18) and the carrier (2), where t, td and FWD are expressed in millimetres, and where FWD+td / nd<0.51.

Description

technical field [0001] The present invention relates to an optical scanning device for scanning an optical record carrier, and to a lens system suitable (but not limited to) for use as an objective lens in the scanning device, and to a method of manufacturing the scanning device and the lens system . Background technique [0002] In the field of optical recording, the current development trend is the miniaturization of the optical record carrier and the scanning device for scanning (eg reading / writing) the optical carrier. Typical optical recording media include CDs (compact discs: compact discs) and DVDs (digital versatile discs: DVDs). [0003] In order to make optical record carriers smaller without reducing the information storage capacity, it is necessary to increase the information density in the record carrier. This increase in information density is necessarily accompanied by the use of smaller spots of light for scanning information. Such a smaller radiation spot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/135G02B13/00G02B13/18G11B7/00G11B7/22
CPCG11B7/1374G02B13/00
Inventor B·H·W·亨德里克斯P·J·H·布勒门
Owner KONINK PHILIPS ELECTRONICS NV