Apparatus for read and/or write record medium
A technology of recording media and equipment, applied in the direction of optical recording head, optical recording/reproduction, data recording, etc., can solve problems such as defective products, increased costs, adverse effects of reflective layers, etc., to achieve optimal alignment, The effect of avoiding focus errors and reducing scanning errors
Inactive Publication Date: 2005-07-06
DEUTSCHE THOMSON-BRANDT GMBH
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Problems solved by technology
A disadvantage of the known device is that, in the case of semi-transparent mirrors, the reflective layer is mounted on the surface of a carrier element
There is therefore a risk that the reflective layer will be adversely affected by external influences
Thus, nonconforming products must be expected during production, or additional costs must be expected to prevent nonconforming products
Method used
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[0015] FIG. 1 shows the device according to the invention in a schematic representation. A laser diode 1 without an astigmatism compensation element produces a scanning beam 2 with astigmatism. This falls onto the half-mirror 3 , is reflected by the half-mirror 3 and is focused by means of the objective lens 4 onto the information-carrying layer of the optical recording medium 6 . The recording medium 6 is only partially shown, and in a cross-sectional representation. The information-carrying layer 5 has date markings, which are preferably arranged along a helical or circular track and which affect at least one characteristic of the scanning beam 2 when it is reflected. In the simplest case, the intensity of the reflected beam is of interest here, that is to say the difference between bright and dark. Other possibilities for influencing the light beam, familiar to those skilled in the art, can also be used expediently here. The reflected scanning beam 2 returns through the ...
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Abstract
The invention relates to a device for reading and / or writing to an optical recording medium, having a light source (1) for generating a scanning light beam (2), a photodetector (7) for detecting the scanning light beam (2) reflected by the recording medium (6) and A semi-transparent mirror (3) for guiding the scanning beam (2) on the recording medium (6) and a photodetector (7) for reflecting the scanning beam (2) is arranged in the beam path. The object of the invention is to improve this type of plant, in particular to reduce production costs. This is achieved in that the semi-transparent mirror (3) is a plane-parallel plate with a layered structure, the reflective layer (10) being partly mounted between two small carrier plates (11, 12).
Description
technical field [0001] The present invention relates to an apparatus for reading and / or writing to an optical recording medium having a light source for generating a scanning beam, a photodetector for detecting the scanning beam reflected by the recording medium and guiding the scanning beam on the recording medium and the photodetector Semi-transparent mirror that reflects the scanning beam. Background technique [0002] A device of this type is known from EP-A-0 198 655 . A disadvantage of the known device is that, in the case of the semi-transparent mirror, the reflective layer is mounted on the surface of a carrier element. There is therefore a risk that the reflective layer will be adversely affected by external influences. Thus, defective products must be expected during production, or additional costs must be expected to prevent defective products. Contents of the invention [0003] The object of the invention is to improve such devices for reading or writing opt...
Claims
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IPC IPC(8): G11B7/12G11B7/135G02B5/08G02B5/18
CPCG11B7/1353G11B7/1362G11B7/1365
Inventor 克里斯琴·比克勒森本宁章弗里德赫尔姆·朱克
Owner DEUTSCHE THOMSON-BRANDT GMBH