JPS6446123A - Drive sequence of a/d touch key - Google Patents

Drive sequence of a/d touch key

Info

Publication number
JPS6446123A
JPS6446123A JP20215587A JP20215587A JPS6446123A JP S6446123 A JPS6446123 A JP S6446123A JP 20215587 A JP20215587 A JP 20215587A JP 20215587 A JP20215587 A JP 20215587A JP S6446123 A JPS6446123 A JP S6446123A
Authority
JP
Japan
Prior art keywords
voltage
turned
electrode
detected
gnd
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.)
Granted
Application number
JP20215587A
Other languages
Japanese (ja)
Other versions
JP2707253B2 (en
Inventor
Toshio Akaha
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP20215587A priority Critical patent/JP2707253B2/en
Publication of JPS6446123A publication Critical patent/JPS6446123A/en
Application granted granted Critical
Publication of JP2707253B2 publication Critical patent/JP2707253B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To detect the accurate voltage at an optional position of the opposite side by holding an electrode of the detecting side of the voltage at a ground level of. CONSTITUTION:When the X coordinates are detected, the control terminals 25-28 are controlled in three steps. In an initial state, the transistors (TR3, 4, 6 and 7 are turned off, the TR5 and 8 are turned on and two electrodes are kept at a ground (GND) level respectively. Then the TR3 and 4 are turned on and the voltage is applied in the X direction. In this case, the electrode of the voltage detecting side is set at a GND level. The TR8 is turned off and the voltage of an optional position in the X direction is detected through an output terminal 30. Then the TR3, 4, 6 and 7 are turned off, the TR5 and 8 are turned on and both electrodes are set at a GND level respectively for detection of the Y coordinates. The TR6 and 7 are turned on, the voltage is applied in the Y direction and the electrode of the voltage detecting side are set at a GND level respectively. Then the TR5 is turned off and the voltage is detected through a terminal 29 at an optional position in the Y direction. Thus it is possible to detect the accurate voltage without generating the electromagnetic induction at the electrode since the electrode is kept at a GND level at the detecting side when the voltage is detected.
JP20215587A 1987-08-13 1987-08-13 Input device Expired - Lifetime JP2707253B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20215587A JP2707253B2 (en) 1987-08-13 1987-08-13 Input device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20215587A JP2707253B2 (en) 1987-08-13 1987-08-13 Input device

Publications (2)

Publication Number Publication Date
JPS6446123A true JPS6446123A (en) 1989-02-20
JP2707253B2 JP2707253B2 (en) 1998-01-28

Family

ID=16452870

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20215587A Expired - Lifetime JP2707253B2 (en) 1987-08-13 1987-08-13 Input device

Country Status (1)

Country Link
JP (1) JP2707253B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5455574A (en) * 1992-02-27 1995-10-03 Gunze Limited Touch panel device including resistance material and position detecting unit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61183729A (en) * 1985-02-08 1986-08-16 Seiko Epson Corp Input device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61183729A (en) * 1985-02-08 1986-08-16 Seiko Epson Corp Input device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5455574A (en) * 1992-02-27 1995-10-03 Gunze Limited Touch panel device including resistance material and position detecting unit

Also Published As

Publication number Publication date
JP2707253B2 (en) 1998-01-28

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term