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An optical drive with improved laser power control (LPC)

A technology of optical drive, power difference, applied in the field of optical drive or optical recording device, which can solve the problem of taking a lot of time

Inactive Publication Date: 2009-08-19
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is therefore that at least two different thresholds have to be found for the laser, it is not possible to read or write during recalibration due to the cooling or heating of the laser which takes a lot of time

Method used

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  • An optical drive with improved laser power control (LPC)
  • An optical drive with improved laser power control (LPC)
  • An optical drive with improved laser power control (LPC)

Examples

Experimental program
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Embodiment Construction

[0048] figure 1 An optical recording device or optical drive and an optical carrier 1 according to the invention are shown. The carrier 1 is fixed and rotated by holding means 30 .

[0049] The carrier 1 contains a material suitable for recording information by means of a radiation beam 5 . For example, the recording material may be magneto-optical, phase change, dyed, metal alloys such as copper / silicon, or any other suitable material. Information is recorded on the optical carrier 1 in the form of optically detectable areas, also called "marks" for rewritable media.

[0050] The device comprises an optical head 20, sometimes referred to as an optical pickup head (OPU), which may be replaced by an actuating means 21, such as an electrical stepper motor. The optical head 20 includes a photodetection system 10 , a laser driving device 30 , a radiation source 4 , a beam splitter 6 , an objective lens 7 and a lens shifting device 9 capable of moving the lens 7 in the radial d...

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PUM

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Abstract

The invention relates to an optical drive for recording information on an optical carrier or disk (1). The optical drive has a radiation source (4) controllable by control means (50, 22) having calibrated values for a threshold current (I_THR_O) and a change current (I_delta_O). The control means (50, 22) is adapted for: 1) re-calibrating the change current (I_delta_O) using the corresponding threshold current (I_THR_O) to a re-calibrated change current (I_delta_l) by application of a power difference (delta_P), and 2) applying the re-calibrated change current (I_DEL_l) together with the calibrated threshold current (I_THR_O). The re-calibration is performed by refining or re-adapting the change current during operation of the optical drive. It is a distinct advantage of the present invention that the re-calibration of the change current can be performed with no or very little time consumption.

Description

technical field [0001] The invention relates to an optical drive or an optical recording device for recording on an associated optical carrier, the drive comprising means for recalibrating the power level of a radiation beam (eg a laser beam) used for recording. The invention also relates to a corresponding control device and a corresponding method. Background technique [0002] During optical recording on an optical disc or optical carrier, for rewritable media, a laser beam is applied to selectively render a phase change material in a crystalline or amorphous state, depending on the data to be written on the optical disc or optical carrier state. Likewise, for write-once media, a laser beam is applied in order to selectively alter / burn / deform (dyed) the material, depending on the data to be written on the optical disc or optical carrier. The laser is driven with a pulse pattern containing higher frequency components than its own channel rate. This has a multi-level puls...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/125
CPCH01S5/0683G11B7/1263H01S5/0617
Inventor J·范伦斯M·卢伊肯斯J·J·A·麦科马克
Owner KONINK PHILIPS ELECTRONICS NV