JPH0161736U

JPH0161736U -

Info

Publication number: JPH0161736U
Application number: JP1987154343U
Authority: JP
Priority date: 1987-10-08
Filing date: 1987-10-08
Publication date: 1989-04-19
Anticipated expiration: 2002-10-08
Also published as: JPH0521153Y2

Description

[Brief explanation of the drawing]

第１図は本考案を実施した光学式タツチ・スク
リーンの位置検出装置の構成を表わすブロツク図
、第２図ａ，ｂ，ｃは本考案装置に与えられるタ
イミング・クロツクφ１，φ２，φ３を表わす波
形図、第３図ａ，ｂ，ｃは本考案装置の動作を表
わす波形図、第４図は通常のタツチ・スクリーン
を表わす図、第５図はタツチ・スクリーンの閾値
を求めるための波形図、第６図ａ，ｂは２台のタ
ツチ・スクリーンを用いた装置を表わす図、第７
図は第６図ａ，ｂに表わす装置に相手側からの外
乱が入射された時の波形図である。１……ＣＲＴ表示画面、２……ウインド・フレ
ーム、２１……発光素子、２２……受光素子、３
０，４０……タツチ・スクリーン、２３……第１
のサンプル・ホールド回路、２４……第２のサン
プル・ホールド回路、２５……第１の比較器、２
６……設定器、２７……第２の比較器。 Fig. 1 is a block diagram showing the configuration of an optical touch screen position detection device embodying the present invention, and Fig. 2 a, b, and c show timing clocks φ1, φ2, and φ3 provided to the device of the present invention. Waveform diagrams, Figures 3a, b, and c are waveform diagrams representing the operation of the device of the present invention, Figure 4 is a diagram representing a normal touch screen, and Figure 5 is a waveform diagram for determining the touch screen threshold. , Figures 6a and b represent a device using two touch screens, Figure 7
The figure is a waveform diagram when a disturbance from the other side is incident on the apparatus shown in FIGS. 6a and 6b. 1... CRT display screen, 2... Window frame, 21... Light emitting element, 22... Light receiving element, 3
0, 40...Touch screen, 23...1st
sample and hold circuit, 24... second sample and hold circuit, 25... first comparator, 2
6...Setter, 27...Second comparator.

Claims

[Claims for Utility Model Registration] A light-emitting element is provided on one side of two pairs of opposing sides of the touch screen, and a light-receiving element is provided on the other side, and the light-emitting elements are made to emit light in sequence so that the light reaching the light-receiving element is blocked. an optical touch screen that detects the position touched on the touch screen;
In the screen position detection device, a first holding means measures disturbance light at a first measurement timing and holds the measured value; and a first holding means measures disturbance light at a second measurement timing and holds the measured value. a second hold means; a first comparator that compares the value of the first hold means and the value of the second hold means and selects the smaller value; and when the light emitting element is driven; A second step detecting the position by determining the difference between the measured value of the light receiving element and the hold value from the comparator and comparing it with a preset threshold value.
an optical touch screen position sensing device having a comparator;