Title:
SIGNAL INPUT CIRCUIT
Document Type and Number:
Japanese Patent JP3217709
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a signal input circuit independent of the kind and polarity of inputted signals.
SOLUTION: This signal input circuit 1 is composed of an input circuit 4 and an input control circuit 2. The input circuit 4 is provided with a first polarity input circuit 41 for inputting the contact point signals of a first polarity, a second polarity input circuit 42 for inputting the contact point signals of a second polarity and a voltage signal input circuit 43 for inputting voltage signals. For instance, the first polarity and the second polarity are respectively a positive polarity and a negative polarity and the contact point signals of the first polarity and the contact point signals of the second polarity are respectively contact point + signals and contact point - signals. The input control circuit 2 switches the first polarity input circuit 41, the second polarity input circuit 42 and the voltage signal input circuit 43.
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Inventors:
Hidekatsu Tsunoshima
Takatoshi Takemoto
Kozo Handa
Takatoshi Takemoto
Kozo Handa
Application Number:
JP24327796A
Publication Date:
October 15, 2001
Filing Date:
September 13, 1996
Export Citation:
Assignee:
PFU Co., Ltd.
Ace Denken Co., Ltd.
Ace Denken Co., Ltd.
International Classes:
A63F7/02; H04L12/40; H04L25/02; H04L29/02; (IPC1-7): H04L29/02; A63F7/02; H04L12/40; H04L25/02
Domestic Patent References:
| JP3285428A | ||||
| JP9178783A | ||||
| JP6310627B2 |
Attorney, Agent or Firm:
Hiroshi Morita (1 person outside)