Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1991-06-07
1994-01-18
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
343701, 343718, 455283, 455344, H01Q 122, H04B 116
Patent
active
052806464
ABSTRACT:
The invention is directed to a wristwatch type paging device having a structure for preventing the intrusion of static electricity. The paging device is provided for receiving or transmitting signals. A pager circuit is provided for controlling and operating on the received or signals to be transmitted. A pager body, having a two part wrist band coupled thereto, houses the pager circuit. The body is formed with at least a conductive portion. The band fastens around the wrist of the user and carries antenna portions. A fastener mechanically couples the end portions and electronically couples the antenna portions. The conductive portion of the pager body is set to the AC ground potential (the potential of one of the positive or negative electrodes of the battery). A balanced varactor diode circuit is provided between the antenna portion ends defining an essentially neutral point coupled to one of its positive and negative electrodes. When the conductive portion of the pager body contacts the user in a fitted state, the static electricity is prevented from entering the paging circuit. A spark gap may also be used to discharge the static electricity.
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patent: 5179733 (1993-01-01), Matsui
Fujisawa Teruhiko
Hama Norio
Koyama Shunsuke
Miura Takanori
Eisenzopf Reinhard J.
Pham Chi
Seiko Epson Corporation
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