| NGK Ceramic Device Co., Ltd. Patent applications |
| Patent application number | Title | Published |
|---|
| 20110240487 | METHOD OF PROCESSING SENSOR ELEMENT AND SENSOR ELEMENT - A method of processing a sensor element includes the steps of: (a) preparing a gas atmosphere containing hydrocarbon, having an air-fuel ratio of 0.80 to 0.9999, and having a small amount of oxidizing gas added thereto; and (b) subjecting a sensor element to a heat treatment in the gas atmosphere at a temperature of 500° C. or higher for 15 minutes or longer. The sensor element includes an electrochemical pumping cell constituted of an oxygen-ion conductive solid electrolyte and an electrode having a NOx reduction ability. A NOx gas in a measurement gas is reduced or decomposed in the electrode. A NOx concentration in the measurement gas is obtained based on a current which flows in the electrochemical pumping cell at a time of the reduction or decomposition. | 10-06-2011 |
| 20110174049 | INSPECTION APPARATUS FOR SENSOR ELEMENT, AND METHOD FOR INSPECTING ELECTRICAL CHARACTERISTICS OF SENSOR ELEMENT - An inspection apparatus including a cylindrical chamber having an opening part and a bottomed end part. The chamber includes an element insertion/extraction part, a tapered part, and a gas introduction part. The element insertion/extraction part is a tubular space continuous from the opening part. The tapered part is connected to the element insertion/extraction part, and is a space having a tapered shape in a cross-sectional view sectioned perpendicularly so that a lengthwise direction is larger toward the inner side. The gas introduction part is a tubular space continuously extending from the tapered part to a bottom portion. A sensor element is inserted into the chamber such that a front end thereof reaches the tapered part while a gap is formed between the sensor element and the chamber, and in this condition, an inspection gas is supplied to the chamber through a supply port provided in the gas introduction part. | 07-21-2011 |
| 20110138875 | METHOD FOR MANUFACTURING SENSOR ELEMENT FOR GAS SENSOR - A method for manufacturing a gas sensor element includes (a) printing a wiring pattern of a conductive paste on a green sheet for an oxygen-ion conductive solid electrolyte; (b) laminating a plurality of green sheets including the green sheet having been subjected to step (a) and integrating the plurality of green sheets; (c) cutting out a plurality of element bodies from the laminated body; (d) baking the element body cut out by step (c); (e) heating the element body having been subjected to step (d), in a reducing atmosphere; (f) driving the element body having been subjected to step (e), in an inspection-purpose gas atmosphere for a predetermined time period; and (g) inspecting electrical characteristics of the element body having been subjected to step (f). The element body having passed the inspection of step (g) is assembled as a sensor element in a gas sensor. | 06-16-2011 |
| 20110100523 | MEASURING EQUIPMENT AND METHOD FOR FORMING LAMINATED BODY - A method for improving an accuracy of measurement of the thickness of a green sheet, and additionally improving yield of a green sheet used for formation of a laminated body is provided. The thickness of each of a plurality of ceramic green sheets is measured, and an average and a variation of obtained thickness measurement values are checked against predetermined ranking criteria. Thereby, a ranking is performed in which the plurality of ceramic green sheets are classified into a plurality of ranks set in the ranking criteria. When forming the laminated body, only a ceramic green sheet belonging to at least one of the ranks which is in advance allowed to be used is used as a ceramic green sheet constituting each layer of the laminated body. | 05-05-2011 |
| 20100243445 | METHOD OF MANUFACTURING GAS SENSOR, GAS SENSOR, AND LAMINATED STRUCTURE THEREOF - A method of manufacturing a gas sensor includes a step of printing a measuring electrode pattern on a ceramic green sheet for forming a measuring electrode, and a step of printing an electrode protection layer pattern on the measuring electrode pattern. The step of forming the protection layer pattern is performed by repeatedly printing a unit layer pattern several times by using a protection layer forming paste with ceramic powder mixed with a pore-forming agent in a predetermined ratio. A ratio of the pore-forming agent in the protection layer forming paste used for forming at least either one of a bottom unit layer pattern and an uppermost unit layer pattern is made larger than that of the pore-forming agent in the protection layer forming paste used for forming a unit layer pattern of other layers. | 09-30-2010 |
