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1. 发明专利

JPH11118747A GAS SENSOR AND ITS MANUFACTURE 失效
公开(公告)号：JPH11118747A
公开(公告)日：1999-04-30
申请号：JP28572197
申请日：1997-10-17
申请人： MIKUNI KOGYO KK , OSAKA GAS CO LTD , YANAGIDA HIROAKI
发明人： HORIUCHI HIDEYUKI , HASUMI KAZUHISA , OKADA OSAMU , YANAGIDA HIROAKI
IPC分类号： G01N27/12
摘要： PROBLEM TO BE SOLVED: To decrease a sensitivity to NO, No2 and SO2 gases relatively to a CO sensitivity by including sodium tungstate or sodium molybdate as an Na compound and adding one or more elements selected from B, Mg, etc. SOLUTION: An element part 11 formed of a metallic oxide semiconductor essentially consisting of CuO and having an Na compound and an assisting additive added thereto, and comb-like electrodes 12, 13 connected to the element part 11 for taking out an electric characteristic change due to the presence of a gas to be detected are formed on a ceramic substrate 14. The element part 11 is a thick film. A paste-like substance composed of the CuO, Na compound and assisting additive of particles as essential solid components is printed into touch with the comb-like electrodes 12, 13 and baked, whereby the element part is formed. At an operation time, a constant voltage is impressed between the comb-like electrodes 12 and 13, and a current change because of the presence of the gas to be detected is detected. A CO gas in an exhaust gas discharged from a burning appliance can be selectively detected and therefore the gas sensor is utilizable in various burning appliances.

2. 发明专利

JPH05249064A 失效
公开(公告)号：JPH05249064A
公开(公告)日：1993-09-28
申请号：JP191593
申请日：1993-01-08
申请人： MIKUNI KOGYO KK , YANAGIDA HIROAKI , OSAKA GAS CO LTD
发明人： HASUMI KAZUHISA , NAGANO KENTARO , KAMIYAMA SHUICHI , YANAGIDA HIROAKI , OKADA OSAMU
IPC分类号： G01N27/00 , G01N27/12
摘要： PURPOSE:To obtain a sensor having practical characteristics and selectivity for CO, by using an N-type semiconductor that contains ZnO as the main constituent and Al2O3 as an additive. CONSTITUTION:An electrode 13 is provided on the surface of a substrate 11 and a P-type semiconductor thick film 15 of which the main constituent is CuO is provided so that it is connected to the electrode. Besides, an electrode 14 is provided on the surface of a substrate 12 and an N-type semiconductor thick film 16 of which the main constituent is ZnO is provided on the surface of this electrode. The thick films 15 and 16 are in mechanical contact with each other and a gas containing a gas to be inspected in introduced into a contact part. The thick film 16 contains Al2O3 as an additive. By adding Al2O3 to the N-type semiconductor in this way, a current passing through the P-N junction is increased by about one figure. While the sensitivity to CO is almost absent in comparison with that to H2 and C3H8 when the purities of both CuO and ZnO, the sensitivity being equal approximately to that to H2 and C3H8 is obtained in relation to Co when Al2O3 is added to the N-type semiconductor.

3. 发明专利

JPS63241458A MONITORING AND REMOVING DEVICE FOR INFLAMMABLE GAS 失效
公开(公告)号：JPS63241458A
公开(公告)日：1988-10-06
申请号：JP7686787
申请日：1987-03-30
申请人： YANAGIDA HIROAKI , OSAKA GAS CO LTD
发明人： YANAGIDA HIROAKI , OKADA OSAMU
IPC分类号： G01N27/12 , G01N27/04
摘要： PURPOSE:To automatically control the concentration of inflammable gas to below constant temperature by providing a semiconductor element, a comparator, a microprocessor, etc. CONSTITUTION:A semiconductor element 4 is supplied with a voltage from a power source 10 and a switch 26 is closed to heat the element 4 into a proper state wherein CO is detected. Further, the comparator 13 detects a voltage drop across a resistor 11 inserted into a passage for supplying a bias voltage to the element 4 through a buffer amplifier 12. At this time, an air sending means 3 is supplied with a current to send air, which is taken in from an air intake 1 and blown to the element 4 to flow toward an air outlet 2. Then when the current value exceeds a 1st threshold value, a microprocessor 16 is placed in catalyst mode automatically. This catalyst mode is carried on for a constant time through the timer operation of the processor 16 and then changes into a detection mode again to detect the concentration of CO; when the detected value exceeds the 1st threshold value, the catalyst mode is entered again.

4. 发明专利

JPS63194724A METHOD AND DEVICE FOR CONTROLLING VAPOR PHASE REACTION 失效
公开(公告)号：JPS63194724A
公开(公告)日：1988-08-11
申请号：JP2654887
申请日：1987-02-06
申请人： YANAGIDA HIROAKI , OSAKA GAS CO LTD
发明人： YANAGIDA HIROAKI , OKADA OSAMU
IPC分类号： H01L29/86 , B01J8/02 , B01J15/00 , B01J19/08 , B01J35/02 , B01J37/34
摘要： PURPOSE:To continuously and easily control the reaction conditions of gas to be reacted, by bringing two kinds of solid substances into contact wherein rectification characteristics are caused by bringing them into contact with each other and controlling voltage impressed between the solid substances. CONSTITUTION:Copper oxide is provided as p-type semiconductor substance to an electrode S1 and zinc oxide is provided as n-type semiconductor substance to an electrode S2. Gas G to be reacted e.g. air mixed with trace carbon monoxide is introduced into the joining face of these two electrodes S1, S2. DC voltage E is impressed between the electrodes S1, S2 and thereby carbon dioxide is produced but the velocity of this chemical reaction can be controlled by changing voltage E. By such a way, the reaction velocity and the kind of gas to be allowed to react can be selectively controlled by impressed voltage E. This method is especially useful for removing trace carbon monoxide mixed into air.

5. 发明专利

JPS6290529A METHOD FOR DETECTING GAS AND GAS SENSOR 失效
公开(公告)号：JPS6290529A
公开(公告)日：1987-04-25
申请号：JP961386
申请日：1986-01-20
申请人： YANAGIDA HIROAKI , OSAKA GAS CO LTD
发明人： YANAGIDA HIROAKI , OKADA OSAMU , NAKAMURA YOSHINOBU , TSURUYA TAKESHI
IPC分类号： G01N27/12 , G01N27/04 , G01N27/22
摘要： PURPOSE:To selectively set sensitivity corresponding to the kind of gas to be detected, by simple constitution such that specimen gas is introduced into the gap between the contact surfaces of two kinds of semiconductive substances each having a rectifying characteristic and the change in the energy level of the potential barrier of each semiconductive substance surface corresponding to the kind of the gas is detected. CONSTITUTION:N-type and P-type semiconductive substances 1, 2 are mechanically held between ceramic substrates 3, 4 by a spring 5 and voltage is applied between lead wires 32, 42 and specimen gas G is introduced into the gap between the contact surfaces of the substances 1, 2 from the direction shown by an arrow to measure a voltage-current characteristic. The specimen gas is detected by utilizing that the energy level of the potential barrier of each semiconductive substance surface changes corresponding to the kind of the specimen gas. Different gas can be selectively detected by controlling voltage to be applied or heating temp. and it is unnecessary to heat an element to high temp. and measurement can be performed even in an atmosphere wherein the concn. of oxygen varies and the specimen gas can be detected with high sensitivity by simple constitution.

6. 发明专利

JP2000338072A CARBON MONOXIDE SENSOR 失效
公开(公告)号：JP2000338072A
公开(公告)日：2000-12-08
申请号：JP14670899
申请日：1999-05-26
申请人： MIKUNI KOGYO KK , YANAGIDA HIROAKI , OSAKA GAS CO LTD
发明人： SUGANO KOJI , HASUMI KAZUHISA , YANAGIDA HIROAKI , OKADA OSAMU
IPC分类号： G01N27/12
摘要： PROBLEM TO BE SOLVED: To selectively and safely detect CO gas by disposing a filter absorbing NO, NO2 and SO2 and permitting carbon monoxide to pass to a passage for introducing gas to be detected into a detection element. SOLUTION: The surface of a detection element 1 is covered with a filter housing 12. An opening 13 is provided to the top part of the housing 12 and gas to be detected is introduced from the opening 13 to transmit through filters 7, 8 of a two-layered stucture while diffusing throughout them to arrive at the surface of the element 1. At this time, NO, NO2 and SO2 are adsorbed by activated carbon or reacted with alkali metal carbonate along with moisture contained in the gas to be detected to be reduced in the amt. arriving at the surface of the detection element 1. Contrarily, carbon monoxide is slight in the amt. adsorbed by activated carbon and not reacted with alkali metal carbonate. Therefore, the influence of NO, NO2, SO2 or the like on the detection element 1 is reduced and the detection sensitivity to carbon monoxide thereof is stabilized and carbon monoxide can be selectively detcted.

7. 发明专利

JP2000292400A GAS SENSOR AND ITS MANUFACTURE 失效
公开(公告)号：JP2000292400A
公开(公告)日：2000-10-20
申请号：JP10325399
申请日：1999-04-09
申请人： MIKUNI KOGYO KK , YANAGIDA HIROAKI , OSAKA GAS CO LTD
发明人： HORIUCHI HIDEYUKI , HASUMI KAZUHISA , YANAGIDA HIROAKI , OKADA OSAMU
IPC分类号： G01N27/12
摘要： PROBLEM TO BE SOLVED: To remove influence of coexisting gas, such as NO or the like, included in gas to be detected, and to improve selectively detection sensitivity relative to carbon monoxide, in a gas sensor having a p-type metal oxide semiconductor mainly composed of copper oxide as a detecting element. SOLUTION: Sodium sulfate is added to a composition of a ptype metal oxide semiconductor 11 as a sodium compound. An addition rate of sodium sulfate is preferably 0.5-20 wt.% relative to copper oxide. And, a compound having one or more constitutive elements selected from B, Mg, Al, Si, P, K, Ca, Ti, V, Zn, Y, Mo, Ba, La, Ce, Pr, Nd, Sm, W, Ta, Pt, Au, Pb, Bi, is preferably included as an auxiliary additive other than the sodium compound.

8. 发明专利

JPH06258270A GAS SENSOR 失效
公开(公告)号：JPH06258270A
公开(公告)日：1994-09-16
申请号：JP4128593
申请日：1993-03-02
申请人： MIKUNI KOGYO KK , YANAGIDA HIROAKI , OSAKA GAS CO LTD
发明人： HASUMI KAZUHISA , NAGANO KENTARO , KAMIYAMA SHUICHI , YANAGIDA HIROAKI , OKADA OSAMU
IPC分类号： G01N27/12
摘要： PURPOSE:To provide a gas sensor formed by using a ceramic semiconductor by connecting electrodes to take out a change in an electric characteristic directly to a (p) type member formed of a (p) type semiconductor mainly composed of CuO. CONSTITUTION:A (p) type member 1 formed of a (p) type semiconductor mainly composed of CuO and two comb shape electrode 2 and 3 to take out a change in an electric characteristic are formed on a board 4. Both comb shape electrodes 2 and 3 are connected directly to the (p) type member 1. The (p) type member 1 is a thick film, and is formed by baking a paste-like material after the paste-like material formed by using CuO particles as a main solid component is printed so as to contact with the comb shape electrodes 2 and 3. When it is operated, constant voltage is impressed between the comb shape electrodes 2 and 3, and an electric current change caused by the existence of gas to be inspected is detected. In this gas sensor, detecting sensitivity to Co changes sharply from an almost no condition to a condition higher than detecting sensitivity to H2 or Ca3H8, so that selective detection of the Co becomes possible.

9. 发明专利

JPS6290528A METHOD FOR DETECTING GAS 失效
公开(公告)号：JPS6290528A
公开(公告)日：1987-04-25
申请号：JP10568086
申请日：1986-05-07
申请人： YANAGIDA HIROAKI , OSAKA GAS CO LTD
发明人： YANAGIDA HIROAKI , OKADA OSAMU , NAKAMURA YOSHINOBU , TSURUYA TAKESHI
IPC分类号： G01N27/12 , G01N27/04 , G01N27/22
摘要： PURPOSE:To detect carbon dioxide with high accuracy by simple constitution such that specimen gas is introduced into the gap between the contact surfaces of two kinds of semiconductive substances each having a rectifying characteristic and the change in the energy level of the potential barrier of each semiconductive substance surface corresponding to the kind of the gas is detected. CONSTITUTION:A N-type semiconductive substance 1 and P-type semiconductive substance 2 are mechanically held between ceramic substrates 3, 4 by a spring a 5 and specimen gas G is introduced into the gap between the contact surfaces of the substances 1, 2 from the direction shown by an arrow. Voltage is applied between the respective lead wires 32, 42 of contacted electrodes 11, 31 and 12, 41 and current are respectively measured in both states, that is, in a state wherein atmospheric gas such as nitrogen is present in the gap and in a state wherein the specimen gas was introduced into the gap. By ultilizing such a phenomenon that the energy level of the potential barrier of a semiconductive substance surface changes to a different value corresponding to the kind of the gas contained in the specimen gas, a minute amount of carbon dioxide can be detected at low temp. with high sensitivity by simple constitution.

10. 发明专利

JPH0830689B2 失效
公开(公告)号：JPH0830689B2
公开(公告)日：1996-03-27
申请号：JP7686787
申请日：1987-03-30
申请人： YANAGIDA HIROAKI , OOSAKA GASU KK
发明人： YANAGIDA HIROAKI , OKADA OSAMU
IPC分类号： G01N27/12 , G01N27/04

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