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Optical scanning device

An optical scanning and spot technology, applied in the field of scanning spot power switching switch, can solve the problem of low edge intensity of radiation beam

Inactive Publication Date: 2008-12-24
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In general, the result is that the rim intensity of the radiation beam entering the objective will then be rather low

Method used

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  • Optical scanning device
  • Optical scanning device
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Examples

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Embodiment Construction

[0037] FIG. 1 is a schematic illustration of the components of an optical scanning device according to the invention, which is designated by the reference number 1 . The optical scanning device 1 is capable of scanning at least one information layer 2 of at least one optical record carrier 3 by means of a radiation beam 4 in a first (writing) mode and in a second (reading) mode.

[0038] As shown, the optical record carrier 3 comprises a transparent layer 5 on one side of which an information layer 2 is arranged. The side of the information layer facing away from the transparent layer 5 is protected from environmental influences by the protective layer 6 . The transparent layer 5 acts as a substrate for the optical record carrier 3 by providing mechanical support for the information layer 2 . Alternatively, the transparent layer 5 may have the sole function of protecting the information layer 2, while the mechanical support is provided by a layer on the other side of the info...

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Abstract

An optical scanning device (1) for scanning an information layer (2) in a write mode and a read mode by means of a radiation beam (25), comprising: a radiation source for emitting said radiation beam ( 7) and an objective lens (10) for converging said radiation beam to form a scanning spot (19) on said information layer. The device also includes a scanning spot power switch (20) for switching the cross-sectional size of the radiation beam between a first size in a write mode and a second larger size in a read mode, so that in switching the edge intensity of the radiation beam between a first edge intensity level (I edge, writing) in a write mode and a second higher edge intensity level (I edge, read) in a read mode, whereby the edge intensity of the radiation beam is switched between The optical power of the scanning spot is switched between a first optical power level (P write) in the write mode and a second optical power level (P read) in the read mode.

Description

technical field [0001] The invention relates to an optical scanning device for scanning an information layer by means of a radiation beam in a writing mode and in a reading mode, the device comprising: [0002] a radiation source for emitting said radiation beam, [0003] an objective lens having an optical axis for converging the radiation beam to form a scanning spot at the location of the information layer, and [0004] a scanning spot power switching switch arranged in the optical path of the radiation beam, for switching the light of the scanning spot between the first optical power in the writing mode and the lower second optical power in the reading mode power. [0005] The invention also relates to a scanning spot power switcher suitable for use in an optical scanning device for scanning an optical record carrier by means of a radiation beam in a writing mode and in a reading mode. [0006] "Scanning an information layer" means scanning with a radiation beam for rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/135G11B7/125G02B26/02G02B3/14
CPCG02B3/14G02B26/005G11B7/1376G11B7/1398G02B26/02G11B7/1263
Inventor T·W·图克B·H·W·亨德里克斯C·T·H·F·里伊登鲍姆S·库伊佩
Owner KONINK PHILIPS ELECTRONICS NV
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