Abstract: Disclosed is a gas sensor element having: a solid electrolyte body containing oxygen-ion conductive ZrO2; a detection electrode disposed on the solid electrolyte body to be exposed to a gas under measurement; and a reference electrode disposed on the solid electrolyte body to be exposed to a reference gas. In the gas sensor element, the detection electrode contains Pt and ZrO2; the detection electrode has a thickness of 3 to 10 ?m; the amount of ZrO2 contained relative to Pt in the detection electrode is 12 to 18 wt %; the detection electrode has a porosity of 5% or lower; and, in a particle size distribution graph of ZrO2 particles in the detection electrode, a cumulative value of peaks appearing in a range of 0.025 ?m to 0.200 ?m is 60 to 75%, and a cumulative value of peaks appearing in a range of 1.000 ?m to 3.162 ?m is 2 to 7%.

Abstract: A gas sensor element includes a solid electrolyte body, a first electrode, a second electrode, and a protective layer. The protective layer includes at least a first catalyst layer that supports a first catalyst metal other than a metal facilitating a reduction reaction of nitrogen oxide and a second catalyst layer that supports only a second catalyst metal facilitating the reduction reaction of the nitrogen oxide. The first catalyst layer and the second catalyst layer are arranged in a path through which a gas under measurement is supplied from the outside of the gas sensor element to the first electrode in such a manner that the first catalyst layer and the second catalyst layer are not in direct contact with each other.

Abstract: Disclosed is a gas sensor element having: a solid electrolyte body containing oxygen-ion conductive ZrO2; a detection electrode disposed on the solid electrolyte body to be exposed to a gas under measurement; and a reference electrode disposed on the solid electrolyte body to be exposed to a reference gas. In the gas sensor element, the detection electrode contains Pt and ZrO2; the detection electrode has a thickness of 3 to 10 ?m; the amount of ZrO2 contained relative to Pt in the detection electrode is 12 to 18 wt %; the detection electrode has a porosity of 5% or lower; and, in a particle size distribution graph of ZrO2 particles in the detection electrode, a cumulative value of peaks appearing in a range of 0.025 ?m to 0.200 ?m is 60 to 75%, and a cumulative value of peaks appearing in a range of 1.000 ?m to 3.162 ?m is 2 to 7%.

Abstract: A gas sensor according to the present invention includes a sensor element made of a solid electrolyte and having at least a cylindrical portion arranged coaxially with an axis of the sensor element and a front end portion closing a front end of the cylindrical portion and a heater formed into either a cylindrical shape or a cylindrical column shape and located inside the sensor element to heat the sensor element by heat generation thereof, wherein a front end portion of the heater is in contact with an inner surface of the front end portion of the sensor element; and wherein a lateral portion of the heater is in contact with an inner circumferential surface of the cylindrical portion of the sensor element.

Abstract: A gas sensor including a detection element (6), wherein a detection electrode (63D) and a reference electrode (62B) are provided on an outer circumferential surface (61A) and an inner circumferential surface, respectively, of a closed-bottomed tubular solid electrolyte body (61). A heater inserted into the tubular hole of the detection element (6) is in contact with the reference electrode at point Q. The detection electrode (63D) is partially formed in the vicinity of a position which faces the point Q with the solid electrolyte body (61) intervening therebetween, and the surface area of the detection electrode (63D) is 8% to 20% of the surface area of a detection portion (64).

Abstract: A gas sensor according to the present invention includes a sensor element made of a solid electrolyte and having at least a cylindrical portion arranged coaxially with an axis of the sensor element and a front end portion closing a front end of the cylindrical portion and a heater formed into either a cylindrical shape or a cylindrical column shape and located inside the sensor element to heat the sensor element by heat generation thereof, wherein a front end portion of the heater is in contact with an inner surface of the front end portion of the sensor element; and wherein a lateral portion of the heater is in contact with an inner circumferential surface of the cylindrical portion of the sensor element.

Abstract: A gas sensor including a detection element (6), wherein a detection electrode (63D) and a reference electrode (62B) are provided on an outer circumferential surface (61A) and an inner circumferential surface, respectively, of a closed-bottomed tubular solid electrolyte body (61). A heater inserted into the tubular hole of the detection element (6) is in contact with the reference electrode at point Q. The detection electrode (63D) is partially formed in the vicinity of a position which faces the point Q with the solid electrolyte body (61) intervening therebetween, and the surface area of the detection electrode (63D) is 8% to 20% of the surface area of a detection portion (64).

Abstract: A gas sensor includes an inner electrode formed on an inner surface of a base body. The inner electrode has an inner sensing portion formed in a gas contact inner region such that the inner sensing portion is located on the whole of a heat-facing area of the gas contact inner region facing a heating portion in a radial direction of the base body, a terminal contact portion formed in a rear end region such that the terminal contact portion is located in at least a part of the rear end region in a circumferential direction of the base body and a lead portion formed only on a part of the inner surface of the base body in the circumferential direction of the base body so as to connect the inner sensing portion and the terminal contact portion to each other.

Abstract: A gas sensor includes an inner electrode formed on an inner surface of a base body. The inner electrode has an inner sensing portion formed in a gas contact inner region such that the inner sensing portion is located on the whole of a heat-facing area of the gas contact inner region facing a heating portion in a radial direction of the base body, a terminal contact portion formed in a rear end region such that the terminal contact portion is located in at least a part of the rear end region in a circumferential direction of the base body and a lead portion formed only on a part of the inner surface of the base body in the circumferential direction of the base body so as to connect the inner sensing portion and the terminal contact portion to each other.

Abstract: A gas sensor comprising: the gas sensor element defined; the cylindrical metal shell defined herein; and the protector defined herein, wherein the protector defined herein has a double structure including the cylindrical inner cover portion and the outer cover portion both defined herein, and a leading end portion positioned on a leading end side of the support face of the metal shell, the outer cylindrical portion and the inner cylindrical portion are arranged to construct an inner gas introducing passage for guiding the object gas introduced from the outer gas introducing apertures, between the outer cylindrical portion and the inner cylindrical portion, across a trailing end of the inner cylindrical portion closer to a leading end side, as viewed in an axial direction, than an inner circumferential side end edge of a joining face joining an inner circumference and an outer circumference of a leading end portion of said metal shell, into a clearance between the inner cover portion and the leading end portio

Abstract: A sensor of the present invention includes a sensor element; a metallic shell; an outer tube member fixed to a rear end portion of the metallic shell; and a protective outer tube member covering an outer surface of the outer tube member. The outer tube member has a seal portion being circumferentially in contact with the protective outer tube member directly or via another member, and a front-side separation portion located frontward of the seal portion and spaced apart from and facing the protective outer tube member. A metal coating layer (plating layer) is formed on the outer surface of at least the front-side separation portion of the outer tube member.

Abstract: A gas sensor having a gas sensor element which includes: a reference electrode; a solid electrolyte layer having oxygen ion conductivity; a detection electrode; and an electrode-protecting layer covering the detection electrode. The electrode-protecting layer is a porous body carrying catalytic metal, and includes: a detection electrode side portion having a catalytic metal loading ratio of more than 0% by weight and not more than 0.005% by weight; and a surface side portion provided closer to the outer surface of the electrode-protecting layer than the detection electrode side portion, the surface side portion having a catalytic metal loading ratio of 0.01% by weight or more.

Abstract: A sensor includes: a sensor element extending in an axial direction comprising a leading end portion exposed to a gas measurement object; a metal shell covering a periphery of the sensor element; an outer cylinder member fixed to a rear end side of the metal shell, the outer cylinder member being composed of a first metal material; and a protection outer cylinder member covering an outer surface of the outer cylinder member, the protection outer cylinder being composed of a second metal material. The outer cylinder member further includes a sealing part in contact with a circumference of the protection outer cylinder member, and a spaced part positioned closer to a leading end side than the sealing part, and spaced from the protection outer cylinder member. The first metal material is less subject to rusting than the second metal material.

Abstract: A gas sensor includes a plate-like sensor element having solid electrolyte layers; a circuit board having a processing circuit for processing an output signal from the sensor element; terminals connected to the sensor element and to the circuit board and serving as electric junctions therebetween; and a metallic casing which encloses the sensor element, the circuit board, and the terminals and has attachment portions for attachment to an external object. The attachment portions are attached to an inlet pipe at a position located downstream of an EGR gas inlet or to a cylinder head.

Abstract: To provide a sensor characterized in that corrosion of an outer tube member by adhesion of salt water or the like is restrained, thereby preventing deterioration in detection accuracy of the sensor, which could otherwise result from penetration of salt water or the like into the interior of the outer tube member. A sensor 100 of the present invention includes a sensor element 2; a metallic shell 4; an outer tube member 11 fixed to a rear end portion of the metallic shell 4; and a protective outer tube member 12 covering an outer surface of the outer tube member 11. The outer tube member 11 has a seal portion A being circumferentially in contact with the protective outer tube member 12 directly or via another member, and a front-side separation portion R1 located frontward of the seal portion A and spaced apart from and facing the protective outer tube member 12. A metal coating layer (plating layer M) is formed on the outer surface of at least the front-side separation portion R1 of the outer tube member 11.

Abstract: The oxygen sensor of the present invention has excellent durability capable of effectively preventing contamination with lead or the like for a detection electrode even in low temperature exhaust gases, and having stable response over a long period of time. The contamination preventive layer provided in the sensor device comprises composite powders having coarse powders covered therearound with fine powders, and hollows not filled with fine powders are scattered in gaps among the composite powders. Both the coarse and fine powders comprise ceramic powders. Further, it is particularly preferred that the ceramic powders are powders of a titania powder having a peak at 1 ?m or less and a composite ceramic powder containing alumina such as spinel having a peak at 10 ?m or more.

Abstract: A gas sensor comprising: a gas sensor element extending in an axial direction; a cylindrical metal shell enclosing said gas sensor element such that a leading end portion of said gas sensor element protrudes from its own leading end; and a protector fixed on said metal shell and covering said leading end portion of said gas sensor element, wherein said protector includes: a cylindrical outer cover portion fixed on said metal shell and having gas introducing apertures; and a cylindrical inner cover portion arranged on an inner side of said outer cover portion and having elastic portions being capable of being elastically deformed by a pushing force acting in an axial direction, and said inner cover portion is so clamped between said metal shell and said outer cover portion that said elastic portions are elastically deformed by said axial pushing force.

Abstract: A gas sensor having a gas sensor element which includes: a reference electrode; a solid electrolyte layer having oxygen ion conductivity; a detection electrode; and an electrode-protecting layer covering the detection electrode. The electrode-protecting layer is a porous body carrying catalytic metal, and includes: a detection electrode side portion having a catalytic metal loading ratio of more than 0% by weight and not more than 0.005% by weight; and a surface side portion provided closer to the outer surface of the electode-protecting layer than the detection electrode side portion, the surface side portion having a catalytic metal loading ratio of 0.01% by weight or more.

Abstract: The present invention introduces that E-mails are managed effectively without imposing a burden on a mail server. A memory is provided in a telephone, whereby an E-mail from the mail server can be down-loaded. When this telephone is accessed from plural terminal devices, the mail status is stored in order to be capable of recognizing that a E-mail is down-loaded to which terminal device. With this system, when E-mails are transmitted and received with plural terminal device, it is possible to manage E-mails integratedly by accessing not a mail server but a telephone.

Abstract: A gas sensor comprising: the gas sensor element defined; the cylindrical metal shell defined herein; and the protector defined herein, wherein the protector defined herein has a double structure including the cylindrical inner cover portion and the outer cover portion both defined herein, and a leading end portion positioned on a leading end side of the support face of the metal shell, the outer cylindrical portion and the inner cylindrical portion are arranged to construct an inner gas introducing passage for guiding the object gas introduced from the outer gas introducing apertures, between the outer cylindrical portion and the inner cylindrical portion, across a trailing end of the inner cylindrical portion closer to a leading end side, as viewed in an axial direction, than an inner circumferential side end edge of a joining face joining an inner circumference and an outer circumference of a leading end portion of said metal shell, into a clearance between the inner cover portion and the leading end portio