WEIGHT-DETECTING DEVICE - MATSUSHITA ELECTRIC IND CO LTD

Title:

WEIGHT-DETECTING DEVICE

Document Type and Number:

WIPO Patent Application WO/1987/004786

Kind Code:

A1

Abstract:

A pressure sensor in which two flat plates composed of a resilient insulating material are stuck together in parallel maintaining a predetermined gap, and provided with electrodes on the opposing surfaces of the flat plates. The load of a material to be measured is exerted on the pressure sensor by load support means, whereby the change in electrostatic capacity is detected accompanying the change in the distance between the electrodes caused by the deflection of the flat plates to detect weight. The gap of electrodes of the pressure sensor is enclosed, and apertures are formed so that the air is permitted to both enter into and come out of the gap. The surface of the pressure sensor is coated with a water-repellant material to prevent the surface from being affected by leakage current that will be caused when dust and dirt build up or when dew is formed. This makes it possible to obtain correct measurement without being affected by the temperature change or the humidity.

Inventors:

SAKAMOTO KAZUHO (JP)
MIHARA MAKOTO (JP)
OHJI KENZO (JP)
ITOU SHUJI (JP)

Application Number:

PCT/JP1987/000070

Publication Date:

August 13, 1987

Filing Date:

February 03, 1987

Export Citation:

Click for automatic bibliography generation Help

Assignee:

MATSUSHITA ELECTRIC IND CO LTD (JP)

International Classes:

G01G3/00; G01G3/12; G01G3/02; G01G7/06; G01G19/56; G01G21/24; G01G21/30; G01L1/14; H05B6/68; H05B6/80; (IPC1-7): G01G3/02; G01L1/14

Foreign References:

JPS49983U	1974-01-07
JPS59918U	1984-01-06
JPS5994028A	1984-05-30
JPS4919875A	1974-02-21
JPS49103663A	1974-10-01
JPS50138864A	1975-11-06

Other References: