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Patent Searching and Data


Title:
PRESSURE SENSOR
Document Type and Number:
Japanese Patent JPH08184519
Kind Code:
A
Abstract:

PURPOSE: To sustain ventilation and waterproofness at a port opened to the atmosphere even for severe outer environment.

CONSTITUTION: The pressure sensor comprises a housing 1 having a port 11 opened to the atmosphere, a pressure sensor chip 2 disposed in the housing 1 so that the atmospheric pressure is received through the port 11 on one side 2a thereof while a pressure to be detected is received on the other side 2b thereof and the pressure difference is detected in the form of a strain, and a sensor circuit 3 for converting the strain of the pressure sensor chip 2 into an electric signal. The port 11 opened to the atmosphere is applied with a ventilative waterproof filter 4 communicating with the atmosphere through a passage 51 having an opening 51b in the direction perpendicular to one side 4a of the filter 4. Since the opening 51b is communicated with the atmosphere through a bent passage 51, the filter 4 is not directed directly to the outside of the housing 1 and protected against direct attack of physical external factor, e.g. mud or a pebble.


Inventors:
YAJIMA TAKASHI
KAJI NORIKIMI
HORI MASAMI
Application Number:
JP32704294A
Publication Date:
July 16, 1996
Filing Date:
December 28, 1994
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
G01L13/06; G01L19/00; G01L19/14; (IPC1-7): G01L19/14; G01L13/06; G01L19/00
Attorney, Agent or Firm:
Shigeji Sato (1 person outside)