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Control circuit for radiation source and method for controlling radiation source

A technology for controlling circuits and radiation sources, which can be used in circuits, program control design, recording/reproducing by optical methods, etc., and can solve problems such as large bandwidth of feedback devices

Inactive Publication Date: 2005-01-19
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the feedback device requires a large bandwidth

Method used

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  • Control circuit for radiation source and method for controlling radiation source
  • Control circuit for radiation source and method for controlling radiation source
  • Control circuit for radiation source and method for controlling radiation source

Examples

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Embodiment Construction

[0066] FIG. 1 schematically shows an embodiment of a device for reading and / or writing an optical or opto-magnetic information carrier 1 . In the illustrated embodiment, the device is suitable for reading and writing. The device comprises a radiation source 2 for generating radiation. The device also comprises an optical system for mapping radiation at the scanning point 3 in the information carrier and displacement means for displacing the record carrier 1 and the scanning point 3 relative to each other. Since the optical system and the displacement means are not relevant to the present invention, they are not shown nor described in detail here. The optical system may be of any type known to those skilled in the art of optical recording, and comprises, for example, one or more optical components such as lenses, mirrors, grids and holograms. Likewise, the displacement means can be realized in different ways known to the skilled person. For example, an apparatus for a disc-s...

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Abstract

The invention pertains to a control circuit (4) for a radiation source (2). The circuit comprises means (43) for generating an error signal (Perr) which is indicative for a difference between a measured average value of the output power of the radiation source (2) and a desired average value (Pset) of the output power of the radiation source. The circuit further comprises combining means (44, 45, 46) for generating a control signal (Sout) for the radiation source (2) in response to said error signal (Perr) and to an information signal (Sin) for modulating the radiation source. The combining means comprise first means (44) for modifying the information signal by a multiplicative factor gamma which is dependent on the error signal, and second means (45, 46) for modifying the information signal by an additive factor sigma which is dependent on the error signal.

Description

technical field [0001] The present invention relates to a radiation source control circuit, and the radiation source control circuit includes: [0002] - means for generating an error signal representing the difference between the measured mean value of the output power of the radiation source and the expected mean value of the output power of the radiation source, [0003] - Combining means for generating a radiation source control signal in response to said error signal and an information signal modulating the radiation source. [0004] The invention also relates to a device for reading and / or writing a record carrier comprising a control circuit. [0005] The invention also relates to an optical transmitter comprising a control circuit. [0006] The invention also relates to a method of controlling a radiation source. Background technique [0007] From US Pat. No. 4,796,267 a laser controller is known which includes a negative feedback loop in order to control the aver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/0683G01J1/42G11B7/125G11B7/1263H01L31/10H01S5/068H04B10/50H04B10/564
CPCH01S5/0683H04B10/564H01S5/06804G11B7/126H04B10/503H01S5/06832G06F9/30083H01S3/0941
Inventor J·J·A·麦科尔马克
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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