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Method and device for sensitivity compensation

A technology of given position, input position, applied in recording/reproduction by optical method, configuration/installation of head, packaging, etc., can solve problems such as spindle motor misalignment

Inactive Publication Date: 2007-11-07
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there may be misalignment of the spindle motor

Method used

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  • Method and device for sensitivity compensation
  • Method and device for sensitivity compensation

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Embodiment Construction

[0056] Figure 1 schematically shows an optical disc drive 1 receiving an optical disc 2 for reading or writing. The drive 1 comprises a housing 3 containing a motor 4 with a rotational axis 5 . The disc 2 is held by a flange 6 mounted on a spindle 7 .

[0057]Furthermore, the housing comprises a pick-up unit in the form of a carriage 10 which is movable substantially linearly in the radial direction of the disc 2 . The carriage 10 is moved by applying a force F on the carriage by radial carriage actuators 11 . The actuator forms a radial coupling as shown at 12 between the carriage 10 and the housing 3 with elastic, rigid and damping properties. The actuator 11 may be a linear motor, a stepper motor or a worm gear motor.

[0058] Furthermore, the pick-up unit includes a platform 20 arranged on a carriage and movable in radial and axial directions. The platform actuator 21 forms a radial and axial coupling as shown at 22 between the platform and the carriage with elastic, r...

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Abstract

Method and device for generating a control voltage for a position actuator of a disk drive system for displacing a lens of a pick-up unit to a given X-position. The actuator is operated by an open loop control system. First, parameters of the control system are calibrated so that the control system produces a control voltage (Va) from an input position signal (Xact setp). Then, the control voltage is processed in a feed forward system for generating a processed control signal (Va_p) which is fed to the position actuator for displacing said lens to the X-position. A Z- value corresponding to the axial distance of the lens from a calibrated axial position and a temperature of the pick-up unit are measured. The position actuator operates according to the formula: Xdc = Va_p * K(Temp,Z) / (R(Temp) * C(Temp,Z)) in which: Xdc = position signal for said given position Va_p = Va processed K = property of 'actuator' 21 : Newton / Ampere R = resistance of 'actuator' coil C = Spring constant in Newton / meter. The Va_p is calculated according to the following formula: Va_p = Xact_set*Cal*S(Tem_cal,Z_cal) / S(Tem_write,Z_write) in which CaI is the result of the calibration S(Temp,Z) = (A_T+B_T*Temp+C_T*TempA2 )*(A_Z+B_Z*Vz+C_Z*VzA2) wherein A T, B T, C T, A Z, B Z, C Z are constants; Vz is the voltage across the Z actuator, Temp cal and Vz cal are the temperature and Vz, respectively, during calibration, Temp write and Vz write are the temperature and Vz, respectively, during writing.

Description

technical field [0001] The invention relates to the field of actuator control, especially for optical disc drives. The actuator is controlled by the control system of the drive to move the lens of the pick-up unit to a given position. Background technique [0002] Optical storage discs comprise at least one storage space in the form of a track, either in the shape of a continuous spiral or in the shape of a plurality of concentric circles. Such discs are CD, DVD or BD. [0003] For writing or reading information, an optical disc drive includes rotational means, such as a spindle motor, for receiving and rotating the disc, and optical means, such as a laser, for generating a beam of light and scanning the tracks. [0004] For optically scanning a rotating disc, the drive includes an objective lens for focusing a beam of light on the disc to a point, and an optical detector for receiving light reflected from the disc and generating an output signal. [0005] During operatio...

Claims

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Application Information

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IPC IPC(8): G11B7/085G11B23/40
CPCG11B7/0945G11B7/09G11B7/085G11B23/40
Inventor C·赫泽曼斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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