JPS5467474A - Surface potentiometer - Google Patents
Surface potentiometerInfo
- Publication number
- JPS5467474A JPS5467474A JP13359377A JP13359377A JPS5467474A JP S5467474 A JPS5467474 A JP S5467474A JP 13359377 A JP13359377 A JP 13359377A JP 13359377 A JP13359377 A JP 13359377A JP S5467474 A JPS5467474 A JP S5467474A
- Authority
- JP
- Japan
- Prior art keywords
- signals
- diode
- capacitance
- potential
- output side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Testing Of Individual Semiconductor Devices (AREA)
Abstract
PURPOSE: To convert the high impedance signals, which are induced in a measuring electrode, into low impedance signals so that they may be extracted with the use of an FET and a diode.
CONSTITUTION: The signals 13 of a surface 1 to be measured are fed to an FET 6 and diode 3 through a space capacitance 10 between the surface 1 and a measuring electrode 2. Even if the diode 3 is under shielded condition as an initial condition, the diode side potential of the capacitance 10 approaches the bias voltage E0 which is impressed upon a terminal 4. If the output side potential of the capacitance 10 is in the vic-nity of E0 at the point A of signals 13, the output side of the capacitance from A to B approaches the lower potential. When that output side potential becomes lower than E0, however, the diode 3 becomes conductive so that the output potential at point B takes the value of E0. From point B to C, the diode 3 is inconductive so that signals having the same waveform as that of the signals 13 are generated at the output side. Thus, similar signals to those signals 13 can be generated at the gate of the FET 6 so that the output having a stable low impedance can be generated at the source or drain.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13359377A JPS5467474A (en) | 1977-11-09 | 1977-11-09 | Surface potentiometer |
US05/956,331 US4267511A (en) | 1977-11-09 | 1978-10-31 | Surface potentiometer |
DE19782848708 DE2848708A1 (en) | 1977-11-09 | 1978-11-09 | SURFACE POTENTIOMETER |
GB7843822A GB2010493B (en) | 1977-11-09 | 1978-11-09 | Surface potentiometer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13359377A JPS5467474A (en) | 1977-11-09 | 1977-11-09 | Surface potentiometer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5467474A true JPS5467474A (en) | 1979-05-30 |
Family
ID=15108427
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13359377A Pending JPS5467474A (en) | 1977-11-09 | 1977-11-09 | Surface potentiometer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5467474A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5485781A (en) * | 1977-12-20 | 1979-07-07 | Matsushita Electric Ind Co Ltd | Electrostatic sensor |
-
1977
- 1977-11-09 JP JP13359377A patent/JPS5467474A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5485781A (en) * | 1977-12-20 | 1979-07-07 | Matsushita Electric Ind Co Ltd | Electrostatic sensor |
JPS5720587B2 (en) * | 1977-12-20 | 1982-04-30 |
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