Title:
OPERATION POSITION DETECTION DEVICE
Document Type and Number:
Japanese Patent JP2015076037
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an operation position detection device capable of increasing the frequency of a scan signal for detecting the operation position of an operation body which operates a capacitance type touch panel.SOLUTION: When a capacitance signal is applied to a capacitance sensor 12 disposed on a touch panel 10, a sensor voltage VM of the capacitance sensor 12 temporarily rises or lowers in accordance with the level of the scan signal, and then converges to a reference voltage Vref. When charging a capacitor 48 is started by the sensor voltage VM, the capacitor 48 is connected to one of constant current sources 50 and 52 in accordance with the switching of a switch 60, and the capacitor 48 is discharged. A scan signal generation part 32 generates the san signal whose signal width in an H level is lower than 1/2 of one cycle, and whose signal width in an L level is shorter than 1/2 of one cycle. When the scan signal is in the H level, a measurement part 36 measures time since charging/discharging the capacitor 48 is started until a voltage Vin of the capacitor 48 matches the reference voltage Vref.
Inventors:
ONO KOICHI
TOKARI EIBEN
HIRAUCHI MANABU
TOKARI EIBEN
HIRAUCHI MANABU
Application Number:
JP2013213682A
Publication Date:
April 20, 2015
Filing Date:
October 11, 2013
Export Citation:
Assignee:
DENSO CORP
International Classes:
G06F3/044
Attorney, Agent or Firm:
Nagoya International Patent Service Corporation
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