# US 2015/0143901 A1 · Sensor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0143901 A1 - Document ID: US20150143901A1 - Status: Published application - Kind: A1 - Application number: 14/538,166 - Filed: 2014-11-11 - Published: 2015-05-28 - Earliest claimed: 2013-11-11 - Assignees: Ngk Spark Plug Co., Ltd. - Applicants: NGK Spark Plug Co., LTD. - Inventors: Ryosuke MATSUI; Shingo YOSHIDA; Shinichi SAWADA - Web page: https://patentgrep.com/patent/US20150143901A1 ## CPC - G01D 11/24: Housings {; Casings for instruments} - G01D 11/245: {Housings for sensors} - G01L 19/147: {Details about the mounting of the sensor to support or covering means} - G01L 19/148: {Details about the circuit board integration, e.g. integrated with the diaphragm surface or encapsulation} - G01N 27/14: of an electrically-heated body in dependence upon change of temperature - F01N 2560/024: for measuring or detecting hydrogen H2 - G01N 33/005: {H2} - G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR - G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) ## Abstract A sensor includes a sensor element; a circuit board having an element attachment surface on which the sensor element is mounted; a casing member for housing the circuit board, the casing member having a measurement chamber which faces the sensor element and communicates with the target atmosphere through a gas inlet; an annular elastic seal member which is interposed between the element attachment surface and the casing member in such a manner that the elastic seal member is in contact with the element attachment surface. The elastic seal member is made of foamed rubber and has an end surface flat portion which faces the casing member and another end surface flat portion which faces the element attachment. The elastic seal member is interposed between the element attachment surface and the casing member such that the elastic seal member is compressed between the flat portions of the end surfaces. ## Claims ### Claim 1 A sensor comprising: a sensor element which is exposed to a target atmosphere and detects a predetermined characteristic of the target atmosphere; a circuit board having an element attachment surface on which the sensor element is mounted; a casing member that houses the circuit board, the casing member having a measurement chamber which faces the sensor element and communicates with the target atmosphere through a gas inlet formed in the casing member; and an annular elastic seal member which is interposed between the element attachment surface and the casing member in such a manner that the elastic seal member is in contact with the element attachment surface, wherein the elastic seal member is made of foamed rubber; the elastic seal member has at least an end surface portion which faces the casing member and at least a portion of an another end surface portion which faces the element attachment surface, both portions being rendered flat; and the elastic seal member is interposed between the element attachment surface and the casing member in a state in which the elastic seal member is compressed between the flat portions of the end surfaces. ### Claim 2 (depends on 1) The sensor according to claim 1, wherein a wiring trace is formed on the element attachment surface of the circuit board, and at least a portion of the corresponding flat portion of the elastic seal member is in tight contact with the surface of the wiring trace. ### Claim 3 (depends on 1) The sensor according to claim 1, wherein the end surface of the elastic seal member which faces the casing member is bonded to the casing member; and an inner surface of the elastic seal member forms at least a portion of an inner wall of the measurement chamber. ### Claim 4 (depends on 1) The sensor according to claim 1, wherein a cross section of the elastic seal member taken orthogonal to the flat portions has a rectangular shape in a no-load condition. ### Claim 5 (depends on 1) The sensor according to claim 1, wherein the foamed rubber has a plurality of closed-cells. ### Claim 6 (depends on 2) The sensor according to claim 2, wherein the end surface of the elastic seal member which faces the casing member is bonded to the casing member; and an inner surface of the elastic seal member forms at least a portion of an inner wall of the measurement chamber. ### Claim 7 (depends on 2) The sensor according to claim 2, wherein a cross section of the elastic seal member taken orthogonal to the flat portions has a rectangular shape in a no-load condition. ### Claim 8 (depends on 3) The sensor according to claim 3, wherein a cross section of the elastic seal member taken orthogonal to the flat portions has a rectangular shape in a no-load condition. ### Claim 9 (depends on 2) The sensor according to claim 2, wherein the foamed rubber has a plurality of closed-cells. ### Claim 10 (depends on 3) The sensor according to claim 3, wherein the foamed rubber has a plurality of closed-cells. ### Claim 11 (depends on 4) The sensor according to claim 4, wherein the foamed rubber has a plurality of closed-cells. ### Claim 12 (depends on 6) The sensor according to claim 6, wherein a cross section of the elastic seal member taken orthogonal to the flat portions has a rectangular shape in a no-load condition. ### Claim 13 (depends on 6) The sensor according to claim 6, wherein the foamed rubber has a plurality of closed-cells. ### Claim 14 (depends on 7) The sensor according to claim 7, wherein the foamed rubber has a plurality of closed-cells. ### Claim 15 (depends on 12) The sensor according to claim 12, wherein the foamed rubber has a plurality of closed-cells.