Title:
SEALING DEVICE FOR CASE
Document Type and Number:
Japanese Patent JP3284094
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a sealing device which can easily and surely detect that a sealed case containing a specific device has been illegally unsealed and prevent a detection result from being altered with illegally applied static electricity or electric noise.
SOLUTION: The sealing device 1 uses a capacitor C2 as a storage element. Therefore, even if a case 26 is put back after being unsealed from a case 24 and a strong static electricity or strong electric noise is applied to an electric path of the sealing device 1, e.g. a terminal exposed from a main body 1a, the capacitor C2 stores the unsealing of the case 24, so the original potential recovers after the application of the noise is ceased. Namely, state inversion caused by noise does not occur unlike a flip-flop used for a conventional sealing device. Consequently, the sealing device 1 can prevent a detection result from being altered with illegally applied static electricity or electric noise.
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Inventors:
Susumu Usami
Application Number:
JP35811197A
Publication Date:
May 20, 2002
Filing Date:
December 25, 1997
Export Citation:
Assignee:
Yatsune Electronics Co., Ltd
International Classes:
A63F7/02; G06F21/75; G06F21/86; G08B13/22; G09F3/03; H05K5/03; (IPC1-7): H05K5/03; A63F7/02
Domestic Patent References:
| JP934365A | ||||
| JP631916A | ||||
| JP5647766A | ||||
| JP4819252A | ||||
| JP9318403A | ||||
| JP5841584A | ||||
| JP55140267U |
Other References:
【文献】実用新案登録3020870(JP,U)
Attorney, Agent or Firm:
Tsutomu Adachi (1 person outside)