Invention Grant
- Patent Title: Position detecting device and position detecting method
- Patent Title (中): 位置检测装置和位置检测方法
-
Application No.: US12534062Application Date: 2009-07-31
-
Publication No.: US08581857B2Publication Date: 2013-11-12
- Inventor: Masaki Matsubara
- Applicant: Masaki Matsubara
- Applicant Address: JP Saitama
- Assignee: Wacom Co., Ltd.
- Current Assignee: Wacom Co., Ltd.
- Current Assignee Address: JP Saitama
- Agency: Seed IP Law Group PLLC
- Priority: JP2008-203325 20080806
- Main IPC: G06F3/041
- IPC: G06F3/041

Abstract:
An electrostatic capacity type position detecting device having increased scanning speed is provided. The device includes a signal supplying electrode including a plurality of electrodes arranged in parallel with each other in a first direction, and a receiving electrode also including a plurality of electrodes arranged in parallel with each other in a second direction perpendicular to the first direction. A one-shot pulse having a predetermined time width is applied sequentially to the plurality of electrodes of the signal supplying electrode at a frequency equal to an integral multiple of 200 kHz. In other words, the sequential application of the one-shot pulse occurs with a time difference that is shorter than (e.g., 1/N of) the predetermined time width. A current change caused at rising and falling edges of the one-shot pulse is detected through the receiving electrode, to thereby indicate a position on the position detecting device.
Public/Granted literature
- US20100289758A1 POSITION DETECTING DEVICE AND POSITION DETECTING METHOD Public/Granted day:2010-11-18
Information query