Linear actuator

Details Linear actuator Linear actuator

2006-07-06

2008-11-04

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

With means for moving directive antenna for scanning,...

C343S879000, C343S901000

Reexamination Certificate

active

07446723

ABSTRACT:
Disclosed is a linear actuator, including: a screw unit rotatably driven by a driving motor; a nut unit screwed to the screw unit; a slider attached to the nut unit, in which the slider and the nut unit move linearly by the rotation of the screw unit; a guide restricting both surfaces of the slider; a first antenna attached to a side wall of the guide opposite to the slider; a second antenna attached to a side wall of the guide opposite to the slider, and opposing the first antenna; and a third antenna attached to both side walls of the slider, being interposed between the first antenna and the second antenna, wherein position of the slider is detected based on a change in capacitance due to displacement of the third antenna with respect to the first antenna and the second antenna.

REFERENCES:
patent: 5150770 (1992-09-01), Secci
patent: 6831393 (2004-12-01), Miyazawa
patent: 11-264451 (1999-09-01), None

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