JPS6237725A - Coordinate detector - Google Patents

Coordinate detector

Info

Publication number
JPS6237725A
JPS6237725A JP60176455A JP17645585A JPS6237725A JP S6237725 A JPS6237725 A JP S6237725A JP 60176455 A JP60176455 A JP 60176455A JP 17645585 A JP17645585 A JP 17645585A JP S6237725 A JPS6237725 A JP S6237725A
Authority
JP
Japan
Prior art keywords
oscillator
degree
coordinates
noises
given
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
Application number
JP60176455A
Inventor
Hisashi Yamaguchi
Kazuo Yoshikawa
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP60176455A priority Critical patent/JPS6237725A/en
Publication of JPS6237725A publication Critical patent/JPS6237725A/en
Application status is Pending legal-status Critical

Links

Abstract

PURPOSE: To detect the coordinates with reduced effect of noises by setting the oscillation frequency of a CR oscillator for detection of coordinates in relation to the induction noises produced from a coordinate display device after providing an additional capacity.
CONSTITUTION: When a touch finger is given to a touch panel 12 of a resistance film containing a transparent electrode of ITO, the change of impedance due to the capacity ratio set up to the touch position is detected by a CR oscillator 16 of a capacity measuring part 15. Then, the oscillation output of a frequency corresponding to the coordinate position is produced. The oscillation frequency of the oscillator 16 is set at the medium level between the n-degree and (n+1)-degree higher harmonic waves of the induction noise given from a display device by an additional capacity 23 when no connection of impedance is given to the resistance film. Thus, the oscillation frequency of the oscillator 16 corresponding to the coordinate value is kept within the frequencies between the n-degree and (n+1)-degree higher harmonic waves excluding these waves. This attains the detection of coordinates with reduced effect of noises.
COPYRIGHT: (C)1987,JPO&Japio
JP60176455A 1985-08-10 1985-08-10 Coordinate detector Pending JPS6237725A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60176455A JPS6237725A (en) 1985-08-10 1985-08-10 Coordinate detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60176455A JPS6237725A (en) 1985-08-10 1985-08-10 Coordinate detector

Publications (1)

Publication Number Publication Date
JPS6237725A true JPS6237725A (en) 1987-02-18

Family

ID=16013999

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60176455A Pending JPS6237725A (en) 1985-08-10 1985-08-10 Coordinate detector

Country Status (1)

Country Link
JP (1) JPS6237725A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0796485A4 (en) * 1994-12-07 1998-09-16 Cirque Corp Capacitance-based proximity sensors with interference rejection apparatus and methods
US8274481B2 (en) 2004-10-22 2012-09-25 Sharp Kabushiki Kaisha Display device with touch sensor, and drive method for the device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0796485A4 (en) * 1994-12-07 1998-09-16 Cirque Corp Capacitance-based proximity sensors with interference rejection apparatus and methods
US8274481B2 (en) 2004-10-22 2012-09-25 Sharp Kabushiki Kaisha Display device with touch sensor, and drive method for the device

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