LINEAR ACTUATOR DEVICE - SINFONIA TECHNOLOGY CO LTD

Title:

LINEAR ACTUATOR DEVICE

Document Type and Number:

WIPO Patent Application WO/2012/002544

Kind Code:

A2

Abstract:

In order to provide a new linear actuator device that corrects the offset shift caused by the weight of a needle, while conserving power and not increasing the size of the device, a linear actuator device (1) is equipped with: an electromagnetic drive unit (10) for driving reciprocating movement of a needle (23) by conducting an electric current according to a drive command (Iref); and an offset correction unit (11) for correcting the drive command (Iref) so as to create an offset electric current for moving the reciprocating movement center (Wc) of the needle (23) in the direction that eliminates the deviation between the reciprocating movement center (Wc) of the needle (23) and the center (Dc) of a possible movement range (D), in the case that when an electric current is not being conducted, the needle (23) shifts due to the weight thereof from the center (Dc) of the prescribed possible movement range (D), and thus the possible range of motion (W1) becomes smaller than the possible movement range (D). The offset correction unit (11) acquires the amplitude information associated with the amplitude value (Lp) of the needle (23) required for reciprocating movement according to the drive command (Iref), and in the case that the adjustable amplitude (W1/2) is insufficient in relation to the amplitude value (Lp) associated with the acquired amplitude information, implements a correction of the drive command (Iref); and in the case that the same is not insufficient, cancels the correction of the drive command (Iref).

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Inventors:

MORIYA HIDEAKI (JP)
MOTOORI TAKENORI (JP)
ITO TAKEO (JP)

Application Number:

PCT/JP2011/065217

Publication Date:

January 05, 2012

Filing Date:

July 01, 2011

Export Citation:

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Assignee:

SINFONIA TECHNOLOGY CO LTD (JP)
MORIYA HIDEAKI (JP)
MOTOORI TAKENORI (JP)
ITO TAKEO (JP)

International Classes:

F16F15/02; H02P25/06

Foreign References:

JP2008256109A	2008-10-23
JP2008256110A	2008-10-23
JP2006014464A	2006-01-12

Attorney, Agent or Firm:

ONISHI, Masanao (JP)
Onishi Masanao (JP)

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