Abstract: A temperature sensor includes a thermo-sensitive element, a pair of element electrode wires electrically connected to the thermo-sensitive element, a sealing body covering the thermo-sensitive element and part of the pair of the element electrode wires, and a tablet formed with a pair of insertion holes through which the pair of the element electrode wires pass. An air bubble is formed at a position within the glass sealing body on a distal end side opposite to the tablet. The center of the air bubble is located within the outline of the thermo-sensitive element when viewed in the axial direction of the pair of the element electrode wires.

Abstract: A temperature sensor includes a thermo-sensitive element, a pair of element electrode wires electrically connected to the thermo-sensitive element, a glass sealing body that covers the thermo-sensitive element and part of the pair of the element electrode wires, and a tablet formed with a pair of insertion holes extending in an axial direction thereof, through which the pair of the element electrode wires pass respectively. The glass sealing body includes a sealing part formed so as to extend from an element side end surface thereof located on a side of the thermo-sensitive element toward the thermo-sensitive element, and a sagging part formed in each of the pair of the insertion holes so as to extend integrally from the sealing part. The length of the sagging part in the axial direction being smaller than or equal to 1.5 mm.

Abstract: A temperature sensor has a thermosensitive element that detects temperature, a pair of element electrode wires electrically connected to the thermosensitive element, and a glass sealing body that has a sealing portion covering the thermosensitive element and a part of the element electrode wires. Further, the temperature sensor has a tablet that has an interface and a pair of insertion holes into which the element electrode wires are inserted, the tablet being joined to the glass sealing body through the interface. Further, the temperature sensor has a low Young's modulus layer provided in the glass sealing body, made of a material having lower low Young's modulus than that of a material forming the sealing portion, and at least partially connecting the sealing portion and the interface of the tablet.

Abstract: A temperature sensor 1 includes: a thermosensitive element 2 composed of a low-thermal expansion ceramics having a coefficient of linear expansion of 3×10?6/° C. to 5×10?6/° C. and of which electrical characteristics change depending on temperature; a pair of electrode films 20 provided on the surfaces of the thermosensitive element 2; and a pair of lead wires having a coefficient of linear expansion of 15×10?6/° C. or less and bonded to the electrode films 20. When the coefficients of linear expansion of the thermosensitive element 2, the electrode film 20, and the lead wire 21 are respectively Ta(/° C.), Tb(/° C.), and Td(/° C.), the temperature sensor 1 satisfies a relationship Ta?Tb?Td.

Abstract: A paired temperature sensor includes two temperature sensors having electrical characteristics substantially equivalent at the same temperature range, each of the temperature sensor having a thermosensitive element therein that changes its electrical characteristics according to temperature, and a pair of lead wires, and a single connector 3 to which the two temperature sensors are connected via the lead wires. The two temperature sensors have electrical characteristics substantially equivalent at the same temperature range. The connector has positioning portions for allowing the connector to be connected in a predetermined orientation relative to a counterpart connector. There is provided at least one distinguishing difference between the two temperature sensors.

Abstract: The temperature sensor includes a thermo-sensitive element, first and second electrode wires electrically connected to the thermo-sensitive element, first and second signal wires partially overlapped with and connected to the first and second electrode wires, respectively. The first and second electrode wires are made of a first metal material consisting primarily of Pt. The first and second signal wires are made of a second metal material containing Al and having a linear thermal expansion coefficient larger than that of the first metal material. Each of an overlap portion of the first electrode wire and the first signal wire and an overlap portion of the second electrode wire and the second signal wire includes a junction part formed by melting and thereafter coagulating the first or second electrode wire and the first or second signal wire. The junction part includes an oxidation film containing Al formed on a surface thereof.

Abstract: A temperature sensor includes a thermo-sensitive element, a pair of element electrode wires electrically connected to the thermo-sensitive element, a sealing body covering the thermo-sensitive element and part of the pair of the element electrode wires, and a tablet formed with a pair of insertion holes through which the pair of the element electrode wires pass. An air bubble is formed at a position within the glass sealing body on a distal end side opposite to the tablet. The center of the air bubble is located within the outline of the thermo-sensitive element when viewed in the axial direction of the pair of the element electrode wires.

Abstract: A temperature sensor includes a thermo-sensitive element, a pair of element electrode wires electrically connected to the thermo-sensitive element, a glass sealing body that covers the thermo-sensitive element and part of the pair of the element electrode wires, and a tablet formed with a pair of insertion holes extending in an axial direction thereof, through which the pair of the element electrode wires pass respectively. The glass sealing body includes a sealing part formed so as to extend from an element side end surface thereof located on a side of the thermo-sensitive element toward the thermo-sensitive element, and a sagging part formed in each of the pair of the insertion holes so as to extend integrally from the sealing part. The length of the sagging part in the axial direction being smaller than or equal to 1.5 mm.

Abstract: A temperature sensor has a thermosensitive element that detects temperature, a pair of element electrode wires electrically connected to the thermosensitive element, and a glass sealing body that has a sealing portion covering the thermosensitive element and a part of the element electrode wires. Further, the temperature sensor has a tablet that has an interface and a pair of insertion holes into which the element electrode wires are inserted, the tablet being joined to the glass sealing body through the interface. Further, the temperature sensor has a low Young's modulus layer provided in the glass sealing body, made of a material having lower low Young's modulus than that of a material forming the sealing portion, and at least partially connecting the sealing portion and the interface of the tablet.

Abstract: A temperature sensing element includes a thermistor composed of Si-base ceramics and a pair of metal electrodes bonded onto the surfaces of the thermistor. The metal electrodes contain Cr and a metal element ? having a Si diffusion coefficient higher than that of Cr. A diffusion layer is formed in a bonding interface between the thermistor and each metal electrode, the diffusion layer including a silicide of the metal element ? in a crystal grain boundary of the Si-base ceramics. A temperature sensor including the diffusion layers is provided. Owing to the diffusion layers, the temperature sensor ensures heat resistance and bonding reliability and enables temperature detection with high accuracy in a temperature range, in particular, of from ?50° C. to 1050° C.

Abstract: The temperature sensor 1 is equipped with a temperature sensitive device 2 to be disposed inside an exhaust pipe of an internal combustion engine, signal lines 31 connected at a top end side to the temperature sensitive device 2 and at a rear end side to leads for connection with an external circuit, an inner member 18 having a sheath pin 3 in which the signal lines 31 are disposed, and an outer member 13 disposed to cover at least a portion of an outer periphery of the inner member 18. The outer member 13 includes a fixed portion (rib 6) to be fixed to an upper wall of the exhaust pipe, a retainer portion 132 retaining the inner member 18, and an extending portion 131 formed closer to a top end side than the retainer portion 132.

Abstract: A paired temperature sensor includes two temperature sensors having electrical characteristics substantially equivalent at the same temperature range, each of the temperature sensor having a thermosensitive element therein that changes its electrical characteristics according to temperature, and a pair of lead wires, and a single connector 3 to which the two temperature sensors are connected via the lead wires. The two temperature sensors have electrical characteristics substantially equivalent at the same temperature range. The connector has positioning portions for allowing the connector to be connected in a predetermined orientation relative to a counterpart connector. There is provided at least one distinguishing difference between the two temperature sensors.

Abstract: The temperature sensor includes a thermo-sensitive element, first and second electrode wires electrically connected to the thermo-sensitive element, first and second signal wires partially overlapped with and connected to the first and second electrode wires, respectively. The first and second electrode wires are made of a first metal material consisting primarily of Pt. The first and second signal wires are made of a second metal material containing Al and having a linear thermal expansion coefficient larger than that of the first metal material. Each of an overlap portion of the first electrode wire and the first signal wire and an overlap portion of the second electrode wire and the second signal wire includes a junction part formed by melting and thereafter coagulating the first or second electrode wire and the first or second signal wire. The junction part includes an oxidation film containing Al formed on a surface thereof.

Abstract: A temperature sensor 1 includes: a thermosensitive element 2 composed of a low-thermal expansion ceramics having a coefficient of linear expansion of 3×10?6/° C. to 5×10?6/° C. and of which electrical s characteristics change depending on temperature; a pair of electrode films 20 provided on the surfaces of the thermosensitive element 2; and a pair of lead wires having a coefficient of linear expansion of 15×10?6/° C. or less and bonded to the electrode films 20. When the coefficients of linear expansion of the thermosensitive element 2, the electrode film 20, and the lead wire 21 are respectively Ta(/° C.), Tb(/° C.), and Td(/° C.), the temperature sensor 1 satisfies a relationship Ta?Tb?Td.

Abstract: A temperature sensor including a temperature sensitive device which is disposed in a flow path through which fluid flows and whose electric characteristic changes as a function of temperature of the fluid in the flow path, signal lines connected at top end sides thereof to said temperature sensitive device through electrode wires and at base end sides thereof to lead wires for connection with an external circuit, a sheath member retaining the signal lines therein, and a holding member which holds an outer circumferential surface of said sheath member directly or indirectly through another member. The resonance (primary) frequency at a top end of the temperature sensor against acceleration in a radius direction of the temperature sensor is 480 Hz or less, thereby reducing the transmission of vibration to the top end of the temperature sensor to avoid the breakage of the temperature sensitive device and the disconnection of the electrode wires 502102 even when the temperature sensor resonates.

Abstract: A method of manufacturing a spark plug having an attachment fitting 2, an insulator 3, a center electrode 4 and an earth electrode 5. While fixed to attachment fitting 2, earth electrode 5 has a convex part 510 formed by projecting a part of an opposed surface 51 toward center electrode 4, and a concave part 520 formed toward the opposed surface 51 from the earth electrode's back surface 52. The convex part 510 is disposed so that the extension of a shaft center of the convex part 510 passes through the area in which the concave part 520 is formed. The relation S1>=s is realized when an area of an opening of the concave part 520 is set to S1 and an average cross-section area of a cross section of the convex part 510 perpendicular to an axial direction of the spark plug is set to s.

Abstract: A protruding length L1 that is a distance between an inner circumference of a flow path through which fluid flows on an axis of a temperature sensor disposed in the flow path and the center of said temperature sensitive device is 50 mm or more. A protruding location that is a distance between an inner circumferential surface of the flow path and the center of said temperature sensitive device on a cross section extending perpendicular to the axis of said flow path through the center of said temperature sensitive device is defined as L1?. A flow path width that is a distance between intersections of the axis of the temperature sensor with the inner circumferential surface of said flow path when the temperature sensor is projected onto said cross section is defined as D1. A relation of L1?/D1 is specified as a function of the value of D1, thereby reducing heat transfer in an exhaust temperature sensor and enabling the temperature to be measured accurately.

Abstract: A temperature sensing element includes a thermistor composed of Si-base ceramics and a pair of metal electrodes bonded onto the surfaces of the thermistor. The metal electrodes contain Cr and a metal element ? having a Si diffusion coefficient higher than that of Cr. A diffusion layer is formed in a bonding interface between the thermistor and each metal electrode, the diffusion layer including a silicide of the metal element ? in a crystal grain boundary of the Si-base ceramics. A temperature sensor including the diffusion layers is provided. Owing to the diffusion layers, the temperature sensor ensures heat resistance and bonding reliability and enables temperature detection with high accuracy in a temperature range, in particular, of from ?50° C. to 1050° C.

Abstract: A spark plug for an internal-combustion engine comprises an attachment fitting 2, an insulator 3, a center electrode 4 and an earth electrode 5. While fixed to the attachment fitting 2, the earth electrode 5 has a convex part 510 formed by projecting toward the center electrode 4 a part of the opposed surface 51, which faces the center electrode 4, of the earth electrode and a concave part 520 formed toward the opposed surface 51 from the earth electrode's back surface 52 which is the reverse side of the opposed surface 51 of the earth electrode 5. The convex part 510 is disposed so that the extension of a shaft center of the convex part 510 may pass through the area in which the concave part 520 is formed. A relation of S1>=s is realized when an area of an opening of the concave part 520 is set to S1 and an average cross-section area of a cross section of the convex part 510 perpendicular to an axial direction of the spark plug is set to s.

Abstract: A method of manufacturing a spark plug having an attachment fitting 2, an insulator 3, a center electrode 4 and an earth electrode 5. While fixed to attachment fitting 2, earth electrode 5 has a convex part 510 formed by projecting a part of an opposed surface 51 toward center electrode 4, and a concave part 520 formed toward the opposed surface 51 from the earth electrode's back surface 52. The convex part 510 is disposed so that the extension of a shaft center of the convex part 510 passes through the area in which the concave part 520 is formed. The relation S1>=s is realized when an area of an opening of the concave part 520 is set to S1 and an average cross-section area of a cross section of the convex part 510 perpendicular to an axial direction of the spark plug is set to s.