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1. 发明专利

JPH1050161A STICKING PHENOMENON RESTRAINING METHOD FOR MERCURY SWITCH 失效
公开(公告)号：JPH1050161A
公开(公告)日：1998-02-20
申请号：JP20008196
申请日：1996-07-30
申请人： ADVANTEST CORP
发明人： KATADA FUMIO , TABUSE KAZUHIKO , WATANABE MASAO
IPC分类号： H01H1/08
摘要： PROBLEM TO BE SOLVED: To provide the sticking phenomenon restraining method for a mercury switch corresponding to the mechanism of its occurrence by making clear the mechanism of a sticking phenomenon for the mercury switch. SOLUTION: Since the sticking phenomenon between the stationary and movable contacts of mercury switch is caused by the deposit and growth to the surface of the stationary contact Pt 131 of Ni compounds 133 having passed through the amalgamation 120 of Ni, Rh, and Cu which are dissolved into Hg 105 from the movable contact, the deposit of the Ni compounds over to the surface of the stationary contact, is thereby restrained. For this reason, a magnetic body is replaced with a non-nickel magnetic body, the surfaces of the movable contact and a spring made of stainless steel are plated with rhodium (Rh), impure elements are prevented from being mixed in the mercury switch, coating with a thin film made of Cr2 O3 , is applied to the surface of the stationary contact, and the quantity of copper plating is limited, so that the dissolution of Ni into Hg, and the deposit of the Ni compounds to the surface of the stationary contact Pt, are thereby prevented.

2. 发明专利

JP2002340961A CONTACT POINT LIFE DIAGNOSIS METHOD 失效
公开(公告)号：JP2002340961A
公开(公告)日：2002-11-27
申请号：JP2001147362
申请日：2001-05-17
申请人： ADVANTEST CORP
发明人： OSHIYAMA YUJI , FUKUSHIMA MUNENORI , KAMEDA HARUHISA , KATADA FUMIO
IPC分类号： G01R31/02
摘要： PROBLEM TO BE SOLVED: To provide a contact point life diagnosis method capable of specifying the utility of a relay contact point which must be changed over without allowing current to flow to the contact point as the use condition of a relay and diagnosing the life of the relay contact point. SOLUTION: The relay contact point is opened and closed in the state that current flows, a sample is acquired every specified times of history, the volume of transfer formed on the contact point acquired as the sample is measured, the measured transfer volume is determined as a sample value, and the number of the times of the history is specified to diagnose the life by comparing the transfer volume determined as the sample value with the other transfer volume formed on the relay contact point to be diagnosed.

3. 发明专利

JPH10255597A MERCURY SWITCH 失效
公开(公告)号：JPH10255597A
公开(公告)日：1998-09-25
申请号：JP5920397
申请日：1997-03-13
申请人： ADVANTEST CORP
发明人： KATADA FUMIO , WATANABE MASAO , HARA TOSHITO
IPC分类号： H01H29/04 , H01H1/08
摘要： PROBLEM TO BE SOLVED: To provide a mercury switch having a longer life by preventing imperfect bonding of a fixed contact with a movable piece when the switch is opened. SOLUTION: A fixed contact 2 and a movable piece 3 are inserted via respective lead pieces 5, 6 into a closed container 1 in which mercury 4 is sealed. The mercury 4 is constantly supplied to the end of the movable piece 3, and the movable piece 3 and the fixed contact 2 make contact via the mercury 4. A film 7 of chromium oxide is formed at the end of the upper lead piece 5. The film 7 of chromium oxide is partly removed at the top of the fixed contact 2 to form an exposed part 2a. The area of the exposed part 2a is set so that the adhesive strength between the fixed contact 2 and the mercury 4 when the entire surface of the fixed contact 2 is wetted with the mercury 4 becomes smaller than the force to separate the movable piece 3.

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