Denso Corporation

Nippondenso Co., Ltd.

Minoru Ota

Masahiro Hamaya

Makoto Hori

Takashi Kojima

Kenji Fukaya

Naoto Miwa

Hirokazu Yamada

Syuichi Nakano

Toshimi Miyamoto

Tomoji Fukaya

Tomoyuki Kato

Yasuhiro Uchida

An oxygen concentration detector comprises a solid electrolyte , a sensing element which consists of the solid electrolyte coated on the surface with an outer electrode , a heater provided inside the solid electrolyte , and a protecting cover which protects the sensing element . The protecting cover has two levels of openings , the outer electrode is constructed within the range defined by the length of the heat-generating part of the heater , and the relationship between the length L of the heat-generating part and the distance between the openings L of the two levels of openings in the axial direction is such that L /L &equals;0.9 to 1.3.

Oxygen concentration detector

An oxygen sensor element is inserted and fixed in a housing. A base body is provided at an end of the housing. The base body is made of a resin. The base body has a flange at an end. The housing has a caulking portion which is deformable when received a pressing force acting in a direction parallel to an axis of the oxygen sensor. By deforming the caulking portion, the flange is tightly connected with the caulking portion.

Oxygen sensor having a solid electrolyte applicable to an internal

An oxygen sensor 3 having a heater 2 capable of providing an improved temperature increasing characteristic, while maintaining an increased amount of introduced air and a high production efficiency. The sensor 3 includes a sensor element 1 having an air chamber 100 in which a heater 2 is arranged. The heater 2 has a rectangular cross sectional shape. In order to produce the heater 2, onto a green ceramic sheet, a heater of a predetermined pattern including a plurality of heater sections is printed. Then, to the printed sheet, different ceramic green sheets are applied so as to obtain a laminated body. The laminated body is subjected to a cutting so as to produce an intermediate body in which a heater section is included. The intermediate body is subjected to a firing to obtain a completed heater.

Oxygen sensor

A lead wire for a sensor has a conductor unit including at least stainless steel wires and copper wires. By setting the cross-sectional percentage of the stainless steel wires in the conductor unit within the range of 30 to 70%, it is possible to obtain a lead wire having low electrical resistance, and high flexibility, tensile strength and elasticity. There are preferred values in hardness and heat treatment of the stainless steel wires. The copper wires are preferably coated with an antioxidant film. The lead wire may include hybrid wires stranded together and obtained by integrally molding or forming stainless steel and copper. It is preferable that the lead wire is coated with an insulating coating material such as a Teflon type resin.

Lead wire for sensor

A small-sized highly accurate gas sensor, which is excellent in its reliability of electric connections between contacts and fixtures while being freed from any damage, includes a base member; a detecting unit mounted on the base member for detecting a gas concentration; electrodes mounted on the detecting unit; cylindrical contacts buried integrally in an end portion of the base member; and electric leads interposed between the cylindrical contacts and the electrodes. Contacting fixtures for external lead wires are fitted in and contact the cylindrical contacts so that they are connected to the cylindrical contacts. The cylindrical contacts are formed in their openings with engaging entrances having a smaller diameter than the internal diameter, and the contacting fixtures include elastic contacting portions adapted to be diametrically reduced, when inserted into the cylindrical contacts, than the engaging entrances and expanded, after inserted, to become larger than the engaging entrances and to contact the inner walls of the cylindrical contacts.

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Okazaki, Japan

Minoru Ota