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Drive system for driving a movable part and disk drive unit comprising such drive system

A technology for driving systems and moving parts, used in propulsion systems, electric components, electrical components, etc., to solve problems such as low efficiency and overshoot of linear motors

Inactive Publication Date: 2008-08-06
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The downside of this increased friction, though, is that it introduces static friction, which is substantially different from kinetic friction
Stiction makes linear motors inefficient due to the high current required to overcome them
Also, overshoot issues are introduced when using these high currents

Method used

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  • Drive system for driving a movable part and disk drive unit comprising such drive system
  • Drive system for driving a movable part and disk drive unit comprising such drive system
  • Drive system for driving a movable part and disk drive unit comprising such drive system

Examples

Experimental program
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Embodiment Construction

[0022] The figures show embodiments of disk drive units. Such a disk drive unit may be used in a device for reading data from and / or writing data on a disk, such as an optical disk or the like. Such devices in which the disc drive unit is used may be portable or stationary devices, such as audio or video players and / or recorders or data disc readers and / or writers. The optical disc in this embodiment may be a high-speed CD / DVD / Blu-ray Disc or the like.

[0023] As shown in FIG. 1, the disk drive unit includes a housing 1 for accommodating the disk drive unit. The disk drive unit includes an optical system 2 including an optical pickup unit 3 and a driven turntable 4 for supporting a disk D. As shown in FIG.

[0024] Figure 2 shows the optical system 2 in more detail. Shown in the figure are an optical pickup unit 3 and a laser source 5 for reading and / or writing information on a disc D. As shown in FIG. The optical path between the laser source 5 and the disc D is determin...

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Abstract

The invention provides a drive system for driving a lens holder (6) of the optical system in a disk drive unit. It comprises a movable part (8) connected to the lens holder, and a base (7) including a guide (9) for guiding the movable part. A drive motor comprises a stator (12) fixed with respect to the base and a translator (13) movable with respect to the stator upon actuation of the motor. A return mechanism (21) is connected between the translator and the movable part for bringing the rotor / translator in a starting position with respect to the movable part in a rest condition of the drive motor. A portion (18) of the movable part is in the path of movement of the translator, while there is a free stroke (20) between the portion of the movable part and the translator in the starting position of the translator. As a result, the translator will hit the movable part, thereby overcoming the static friction between the movable part and the base.

Description

technical field [0001] The invention relates to a drive system for driving a movable part, the drive system comprising a base comprising guide means for guiding the movable part and a drive motor comprising a stator and a rotor / translator, the stator opposing The base part is fixed and the rotor / converter is movable relative to the stator upon activation of the motor. Background technique [0002] Such drive systems may be used in applications requiring small and precise movements of movable parts. For example, one of these uses is a drive system in an optical system used with an optical disc drive. In these optical systems, one or more lenses must be able to move position relative to each other. Most of this movement is performed by a drive system comprising an electric motor. Such drive systems are usually equipped with a rotary motor. This motor drives a movable part through a transmission such as a gear or a conveyor belt. A disadvantage of this type of drive is tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09H02K41/035G11B7/135
CPCG11B7/08511G11B7/1376G11B2007/0013G11B19/20H02K41/035
Inventor W·C·J·比尔霍夫
Owner KONINK PHILIPS ELECTRONICS NV