JPH02201526A - Method for reading in light reception output signal of optical touch panel - Google Patents
Method for reading in light reception output signal of optical touch panelInfo
- Publication number
- JPH02201526A JPH02201526A JP1019663A JP1966389A JPH02201526A JP H02201526 A JPH02201526 A JP H02201526A JP 1019663 A JP1019663 A JP 1019663A JP 1966389 A JP1966389 A JP 1966389A JP H02201526 A JPH02201526 A JP H02201526A
- Authority
- JP
- Japan
- Prior art keywords
- light
- unit optical
- output signal
- reception output
- signal
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010408 sweeping Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 241000288105 Grus Species 0.000 description 1
- 241000785736 Pholis crassispina Species 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Position Input By Displaying (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光学式タッチパネルの受光出力信号を記憶装置
へ読み込む方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of reading a light reception output signal of an optical touch panel into a storage device.
第2図aは光学式タッチパネルの説明図である。 FIG. 2a is an explanatory diagram of the optical touch panel.
第2図aにおいて、11は発光素子列、Ilaは発光素
子、12は受光素子列、12aは受光素子、13は表示
器、14は遮光物体である。In FIG. 2a, 11 is a light emitting element array, Ila is a light emitting element, 12 is a light receiving element array, 12a is a light receiving element, 13 is a display, and 14 is a light shielding object.
光学式タッチノソネルは第2図aに示すように表示器1
3の表示面の周辺に、多数の赤外光発光素子11thを
配列した発光素子列11と、多数の赤−外光受光素子1
2aを配列した受光素子列12を水平と垂直に対向して
配設し、それぞれ対向する発光素子11hと受光素子1
2aとが連係動作するようにして形成した単位光学系を
、水平方向と垂直方向に順次掃引して、単位光学系ごと
に発光素子の不発光時と発光時におけるそれぞれの受光
出力信号レベルを記憶装置に読み込み、該レベルを比較
して、表示器13の表示面上に形成される赤外光線マト
リックスの交点にタッチした遮光物体14の位置の直交
座標を検出し、該位置情報を出力するものである。The optical touch sensor has a display unit 1 as shown in Figure 2a.
A light emitting element row 11 in which a large number of infrared light emitting elements 11th are arranged around the display surface of 3, and a large number of infrared light receiving elements 1.
A light-receiving element row 12 in which light-receiving elements 2a are arranged is arranged horizontally and vertically to face each other, and a light-emitting element 11h and a light-receiving element 1 are arranged facing each other.
2a are sequentially swept in the horizontal and vertical directions, and the received light output signal level is stored for each unit optical system when the light emitting element is not emitting light and when it is emitting light. A device that reads the information into the device, compares the levels, detects the orthogonal coordinates of the position of the light-shielding object 14 touched at the intersection of the infrared ray matrix formed on the display surface of the display 13, and outputs the position information. It is.
第2図すは前記単位光学系の構成説明図でllaは発光
素子、12aは受光素子、15a、15bはアナログス
イッチ、16は増幅器、17は負荷抵抗、18は受光出
力信号である。この単位光学系が掃引信号を受けると、
まづ、アナログスイッチ153が接となって、受光素子
12hが動作状態となる。続いてアナログスイッチ15
bが一定時間接となシ、発光素子11hが発光し、受光
素子12mがこれを受光すると負荷抵抗17に電流が流
れて発生する電圧を増幅器16によシ耽薫、増幅して受
光出力信号18として出力する。FIG. 2 is an explanatory diagram of the configuration of the unit optical system, where lla is a light emitting element, 12a is a light receiving element, 15a and 15b are analog switches, 16 is an amplifier, 17 is a load resistor, and 18 is a light receiving output signal. When this unit optical system receives a sweep signal,
First, the analog switch 153 is turned on, and the light receiving element 12h is brought into operation. Next, analog switch 15
When b is closed for a certain period of time, the light emitting element 11h emits light, and when the light receiving element 12m receives the light, a current flows through the load resistor 17, and the voltage generated is transmitted to the amplifier 16 and amplified to produce a light reception output signal. Output as 18.
この受光出力信号18はアナログスイッチ15hが汲に
なるとき過渡電流によシ生ずるパルス性ノイズと、受光
素子12aが動作状態になると、発光素子11mが未発
光でも、受光素子12の暗電流および外乱光による電流
が負荷抵抗17に流れて生ずる低レベル信号と発光素子
11hが発光したときの高レベル信号とを含んでいる。This light reception output signal 18 is caused by pulse noise caused by a transient current when the analog switch 15h is turned on, dark current of the light reception element 12 and disturbance when the light reception element 12a is activated, even if the light emitting element 11m is not emitting light. It includes a low level signal generated when a current due to light flows through the load resistor 17 and a high level signal generated when the light emitting element 11h emits light.
これらの信号のうち、低レベル信号と高レベル信号を一
定のタイミングで記憶装置(図示せず)へ読み込んでゆ
くが、従来は前記・ぐルス注ノイズが減衰するのを待っ
て、先づ、低レベル信号を読み込み、続いて高レベル信
号を読み込んでいた。Of these signals, the low-level signal and high-level signal are read into a storage device (not shown) at a certain timing, but conventionally, the signals are first read after waiting for the noise to decay. It was reading a low level signal and then a high level signal.
第3図は第2図すの受光出力信号18の従来の読み込み
タイムチャートである。第3図において、(イ)はアナ
ログスイッチ15aを駆動するノぐルス。FIG. 3 is a conventional reading time chart of the light reception output signal 18 shown in FIG. In FIG. 3, (a) is a nozzle that drives the analog switch 15a.
(ロ)はアナログスイッチ15bを駆動するノクルス。(b) is a Noculus that drives the analog switch 15b.
(ハ)は受光出力信号18の波形(図中、twは読み込
み時期時間であ狼。に)は低レベル信号読み込み・母ル
ス。(ホ)は高レベル信号読み込みノ’?ルスである。(C) is the waveform of the received light output signal 18 (in the figure, tw is the reading timing time) is the low level signal reading/main pulse. (E) Is it high level signal reading? It's Luz.
前記表示器の表示面の周辺に水平と垂直に配列された多
数の単位光学系は掃引により頚次、(イ)の・ンルスに
より、受光素子を動作状態とし、(ロ)のパルスにより
発光素子を発光させるが(イ)の・9ルスによシアナロ
グスイッチ15mが接になったとき生ずる・ぐルス性ノ
イズが減衰し定常状態になるまでの時期時間jwを経過
してからに)のパルスにより低レベル信号を記憶装置へ
読み込んでから発光させ、(ホ)のノクルスにより高レ
ベル信号を記憶装置へ読み込む。A large number of unit optical systems arranged horizontally and vertically around the display surface of the display unit are moved vertically by sweeping, the light-receiving element is activated by the pulse in (a), and the light-emitting element is activated by the pulse in (b). The pulse of (a), which occurs when the analog switch 15m is connected due to the 9 pulses, is emitted after the period of time jw has elapsed until the pulsing noise attenuates and reaches a steady state. The low-level signal is read into the storage device and then emitted, and the high-level signal is read into the storage device by the Noculus (e).
以上のように従来の光学式タッチ・やネルの受光出力信
号の記憶装置への読み込み方法は、高レベル信号の読み
込み前に、低レベル信号の読み込みを行っていた。As described above, in the conventional method of reading the light reception output signal of an optical touch panel into a storage device, a low level signal is read before a high level signal is read.
光学式タッチパネルは前記のように表示器の表示面の周
辺に多数の単位光学系を配列し、これを掃引して赤外光
線マトリックスを形成し、表示面上にタッチし、該赤外
光線を遮光する物体の位置の直交座標を検出して、その
位置情報を出力し、該情報を受けたコンビーータからの
応答を得るシステムに組込まれて使用されるものである
ので検出速度の早いものが要求される。しかるに従来は
前記のように単位光学系の受光素子を駆動するとき発生
するパルス性ノイズが減衰し、定常状態になる迄、時期
してから受光出力信号の低レベル信号の読み込みを行っ
たのち発光素子を駆動し、高レベル信号の読み込みを行
っていた。この時期時間は単位光学系の受光出力信号を
読み込むのに必要とする時間のうち可成りの時間を占め
ているので掃引速度を上げ、タッチした物体の位置の検
出速度を上げることができないという欠点があった3゜
本発明は前記のパルス性ノイズに影響されることなく、
低レベル信号の読み込みを行うようにして掃引速度を上
げ、検出速度を上げることのできる受光出力信号読み込
み方法を提供することを目的とする。As mentioned above, the optical touch panel arranges a large number of unit optical systems around the display surface of the display device, sweeps them to form an infrared ray matrix, and touches the display surface to emit the infrared rays. It is used by being incorporated into a system that detects the orthogonal coordinates of the position of a light-blocking object, outputs the position information, and obtains a response from the conbeater that receives this information, so a fast detection speed is required. be done. However, conventionally, as mentioned above, the pulse noise generated when driving the light receiving element of the unit optical system is attenuated, and the low level signal of the light receiving output signal is read after a period of time until the steady state is reached, and then the light is emitted. It drove the elements and read high-level signals. This period of time occupies a considerable amount of the time required to read the light receiving output signal of the unit optical system, so it is not possible to increase the sweep speed or increase the speed of detecting the position of the touched object. 3゜The present invention is not affected by the above-mentioned pulse noise,
It is an object of the present invention to provide a method for reading a received light output signal that can read a low level signal to increase the sweep speed and increase the detection speed.
本発明は前記の課題を解決するために、前記発光素子列
と受光素子列とを形成する複数の単位光学系を、任意の
数の該単位光学系を含む複数の群に分割して、該群を順
次掃引し、前記単位光学系の不発光時と発光時の受光出
力信号のそれぞれのレベルの記憶装置への読み込みを各
群ごとに、不発光時の信号レベルは当該群中の一つの単
位光学系について行い、発光時の信号レベルは、当該群
に含まれるすべての単位光学系について行うようにして
、掃引速度を上げ、検出速度を上げるようにしたもので
ある。In order to solve the above problems, the present invention divides a plurality of unit optical systems forming the light emitting element row and the light receiving element row into a plurality of groups including an arbitrary number of the unit optical systems. The groups are sequentially swept, and the respective levels of the light reception output signal when the unit optical system is not emitting light and when it is emitting light are read into the storage device for each group. The measurement is performed for each unit optical system, and the signal level at the time of light emission is determined for all the unit optical systems included in the group to increase the sweep speed and the detection speed.
本発明は前記のように複数の単位光学系を複数の群に分
割し、各群ごとに単位光学系の受光出力信号の記憶装置
への読み込みを、不発光時の信号レベルは当該群中の一
つの単位光学系についてのみ行い、発光時の信号レベル
は当該群に含まれるすべての単位光学系について行うよ
うにしたので、掃引により単位光学系を切替え駆動した
ときに生rる・ぐルス性ノイズの減衰を時期するのは不
発光時の信号レベルを読み込むときだけで、発光時の信
号レベルは切替直後に読み込みできるので、掃引速度を
大幅に上げることができるのである。As described above, the present invention divides a plurality of unit optical systems into a plurality of groups, reads the received light output signal of the unit optical system into a storage device for each group, and sets the signal level of the unit optical system in the group when no light is emitted. This was done for only one unit optical system, and the signal level at the time of light emission was determined for all unit optical systems included in the group, so it is possible to reduce the r/Grus characteristics that occur when switching and driving the unit optical system by sweeping. The noise attenuation is only timed when reading the signal level when no light is emitted, and the signal level when light is emitted can be read immediately after switching, making it possible to significantly increase the sweep speed.
本発明の実施例を第1図および前記第2図を援用して説
明する。第1図は本発明の一実施例のタイムチャートで
ある。すなわち、第2図aに示す発光素子列と受光素子
列とを形成するとともに、それぞれ対向する単一の発光
素子と受光素子とが連係動作するようにした多数の単位
光学系を複数の群に分割して掃引、駆動して受光出力信
号を得て、不発光時と発光時の信号レベルを記憶装置へ
読み込むときの時間関係を示すものである。Embodiments of the present invention will be described with reference to FIG. 1 and FIG. 2. FIG. 1 is a time chart of one embodiment of the present invention. That is, in addition to forming the light emitting element array and the light receiving element array shown in FIG. It shows the time relationship when dividing, sweeping and driving to obtain a light reception output signal and reading the signal levels in the non-emission state and in the emission state into the storage device.
第1図に示す実施例は前記多数の単位光学系をm個の群
に分割し、各群をn個の単位光学系で溝成し、受光素子
の受光出力信号のうち不発光時の信号レベルの読み込み
は、各群ごとに第1番目の単位光学系についてのみ行い
、発光時の信号レベルの読み込みは、当該群を構成する
n個の単位光学系のすべてについて行うようにした場合
である。In the embodiment shown in FIG. 1, the large number of unit optical systems is divided into m groups, each group is made up of n unit optical systems, and the signal when the light is not emitted among the light receiving output signals of the light receiving element is This is a case where the reading of the level is performed only for the first unit optical system for each group, and the reading of the signal level at the time of light emission is performed for all of the n unit optical systems that make up the group. .
第1図において、(イ)は各群(1〜m)の第1番目の
単位光学系の受光素子駆動パルスと発光素子駆動パルス
を示す。以下、(ロ)、 r−t 、に)はそれぞれ第
2番月、第n1番目、第n番目の前記両駆動パルスを示
す。(ホ)はすべての受光素子の受光出力信号、(へ)
は不発光時の信号レベルを記憶装置へ読み込むパルス、
(ト)は発光時の受光出力信号レベルを記憶装置へ読み
込む・ぐルスである。In FIG. 1, (a) shows the light receiving element driving pulse and the light emitting element driving pulse of the first unit optical system of each group (1 to m). Hereinafter, (b), r-t, and b) indicate the second, n1th, and nth drive pulses, respectively. (E) is the light receiving output signal of all light receiving elements, (F)
is a pulse that reads the signal level when no light is emitted into the storage device,
(g) is a signal that reads the light reception output signal level at the time of light emission into the storage device.
(イ)の第1番目の単位光学系の受光素子駆動・ぐルス
の長さは不発光時の信号レベルと、発光時の信号レベル
とを記憶回路に読み込むことができる時間に設定する。The length of the light-receiving element drive loop of the first unit optical system in (a) is set to a time that allows the signal level when no light is emitted and the signal level when light is emitted to be read into the storage circuit.
すなわち、第1の単位光学系が掃引され、受光素子駆I
#JJパルスによシ受光素子が駆動されると、前記第2
図すに示すアナログスイッチ15aが接になると、その
過渡電流によりノクルス性ノイズが発生し、第1図(ホ
)に示す受光出力信号が出力されるので、このパルス性
ノイズが減衰するのを待って、第1図(へ)に示す不発
光時の信号レベル読み込みパルスによシ、該信号レベル
を記憶装置に読み込み、続いて(イ)の発光素子駆動・
4ルスにより発光素子を駆動して発光させ、第1図(ト
)の発光時の信号レベル読み込み/?ルスによシ発光時
の受光出力信号のレベルを記憶装置に読み込む。That is, the first unit optical system is swept, and the light receiving element driver I
When the light receiving element is driven by the #JJ pulse, the second
When the analog switch 15a shown in FIG. Then, the signal level is read into the storage device using the signal level reading pulse during non-emission shown in FIG.
4) Drive the light emitting element to emit light, and read the signal level when emitting light as shown in Figure 1 (g). The level of the light reception output signal at the time of light emission is read into the storage device.
本発明は前記のように複数の単位光学系を複数の群に分
割し一つの群の中の一つの単位光学系において読み込ん
だ不発光時の信号レベルと、当該群中のすべての単位光
学系の発光時の受光出力信号のレベルとを比較して遮光
物体の有無を検出する方法であるので、第1図仲)の第
2番目からに)の第n番目迄の単位光学系においては、
各単位光学系が掃引駆動されたときに発生するノぞルス
性ノイズが十分に減衰するのを待たずに発光素子を、駆
動して、発光時の受光出力信号のレベルを読み込んで行
けばよいので、受光素子駆動・ぐルスの長さを短縮する
ことができる。従って、従来の単位光学系ごとに不発光
時と発光時の受光出力信号レベルを交互に読み込む方法
に比べ、掃引速度を大幅に上げることができる。なお不
発光時の信号レベルの読み込みは、前記実施例のように
各群の第1番目の単位光学系に限定するものでなく、2
〜m番目のいづれでも良いことはいうまでもない。As described above, the present invention divides a plurality of unit optical systems into a plurality of groups, and calculates the signal level when no light is emitted read in one unit optical system in one group, and the signal level of all the unit optical systems in the group. This method detects the presence or absence of a light-blocking object by comparing the level of the received light output signal when emitting light.
Simply drive the light-emitting element and read the level of the light-receiving output signal when emitting light, without waiting for the nozzle noise generated when each unit optical system is swept-driven to sufficiently attenuate. Therefore, the length of the light-receiving element drive/guru can be shortened. Therefore, compared to the conventional method of alternately reading the light reception output signal level when no light is emitted and when the light is emitted for each unit optical system, the sweep speed can be significantly increased. Note that the reading of the signal level when no light is emitted is not limited to the first unit optical system of each group as in the above embodiment;
It goes without saying that any one of the numbers .about.mth is fine.
更に、群を構成する単位光学系の数は、水平方向と垂直
方向とで変えてもよく、また前記各方向の両端と中央部
とで変えてもよい。Further, the number of unit optical systems constituting the group may be changed in the horizontal direction and the vertical direction, or may be changed between the ends and the center in each of the directions.
以上、詳細に説明したように本発明によると、光学式タ
ッチ・ゼネルの発光素子列と受光素子列を形成する複数
の単位光学系を複数の群に分割して掃引し、受光出力信
号の記憶装置への読み込みを、不発光時の信号レベルは
、当該群を構成する複数の単位光学系の一つについて行
い、発光時の信号しノベルは、当該群を構成するすべて
の単位光学系について行うようにしたので、掃引速度を
上げることができ、従りて検出速度を早めることができ
るという効果がある。さらに、光学式タッチパネルの前
記受光素子列に入射する外乱光の明るさが該受光素子列
の場所によって異なる場合でも、各群ごとに、外乱光の
明るさに対応する不発光時と発光時の信号レベル差をう
ることかできるので遮光物体の有無を正確に検出するこ
とができるという効果が期待できる。As described above in detail, according to the present invention, a plurality of unit optical systems forming the light emitting element array and the light receiving element array of the optical touch Zener are divided into a plurality of groups and swept, and the light reception output signal is stored. The signal level when no light is emitted is read into the device for one of the multiple unit optical systems that make up the group, and the signal level when light is emitted is read for all the unit optical systems that make up the group. This has the effect that the sweep speed can be increased, and therefore the detection speed can be increased. Furthermore, even if the brightness of the ambient light incident on the light receiving element array of the optical touch panel differs depending on the location of the light receiving element array, for each group Since the signal level difference can be detected, the effect of accurately detecting the presence or absence of a light blocking object can be expected.
第1図は本発明の一実施例のタイムチャート、第2図a
は光学式タッチ・ぐネルの説明図、第2図すは第2図a
の単位光学系の構成説明図、第3図は第2図すの受光出
力信号18の従来の読み込みタイムチャートである。
1ノ・・・発光素子列、l1m・・・発光素子、12・
・・受光素子列、12a・・・受光素子、13・・・表
示器、14・・・遮光物体、15a、15b・・・アナ
ログスイッチ、16・・・増幅器、17・・・負荷抵抗
、18・・・受光出力信号。
特許出願人 ミナトエレクトロニクス株式会社光学式
タッチ・ぐネルの説明図
第2図Q
今vec
+VCC
第2図aの単位光学系の構成説明図
(イ)アナログスイッチ15a駆動パルス第2図すの受
光出力信号18の従来の読み込みタイムチャ第3図
トFig. 1 is a time chart of an embodiment of the present invention, Fig. 2a
is an explanatory diagram of the optical touch control, Figure 2 is Figure 2a
FIG. 3 is a conventional reading time chart of the received light output signal 18 shown in FIG. 2. 1 No. Light emitting element row, l1m... Light emitting element, 12.
... Light receiving element row, 12a... Light receiving element, 13... Display, 14... Light blocking object, 15a, 15b... Analog switch, 16... Amplifier, 17... Load resistor, 18 ...Light reception output signal. Patent applicant: Minato Electronics Co., Ltd. Explanatory diagram of optical touch gunnel Figure 2 Q Imvec +VCC Explanatory diagram of the configuration of the unit optical system in Figure 2 a (a) Analog switch 15a drive pulse Figure 2 Light reception output of Conventional reading time chart of signal 18
Claims (1)
、発光素子列と受光素子列とを配設し、該両素子列を形
成するとともに、それぞれ対向する単一の発光素子と受
光素子とが連係動作するようにした複数の単位光学系を
水平と垂直方向に順次掃引、駆動して光マトリックスを
形成し、不発光時と発光時の受光出力信号のそれぞれの
レベルを記憶装置に読み込み、該両信号レベルを比較し
て、表示面上にタッチし遮光する物体の位置の直交座標
を検出し、該位置情報を出力する光学式タッチパネルの
受光出力信号読み込み方法において、前記複数の単位光
学系を、任意の数の該単位光学系を含む複数の群に分割
して、該群を順次掃引し、前記検出を行うために比較す
る前記両信号レベルの記憶装置への読み込みは、前記各
群ごとに、不発光時の信号レベルは当該群中の一つの単
位光学系について行い、発光時の信号レベルは当該群に
含まれるすべての単位光学系について行うようにしたこ
とを特徴とする光学式タッチパネルの受光出力信号読み
込み方法。(1) A light-emitting element row and a light-receiving element row are disposed horizontally and vertically opposite to each other around the display surface of the display device, and a single light-emitting element facing each other forms both the element rows. A plurality of unit optical systems in which the light receiving element and the light receiving element work together are sequentially swept and driven in the horizontal and vertical directions to form an optical matrix, and the respective levels of the light receiving output signal when no light is emitted and when light is emitted are memorized. In the method for reading a light reception output signal of an optical touch panel, the plurality of light reception output signals are read into a device, the signal levels are compared, the orthogonal coordinates of the position of a light-blocking object that is touched on the display surface are detected, and the position information is outputted. The unit optical system is divided into a plurality of groups including an arbitrary number of unit optical systems, the groups are sequentially swept, and both signal levels to be compared in order to perform the detection are read into a storage device. , for each group, the signal level when not emitting light is determined for one unit optical system in the group, and the signal level when emitting light is determined for all unit optical systems included in the group. How to read the light reception output signal of an optical touch panel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1019663A JPH02201526A (en) | 1989-01-31 | 1989-01-31 | Method for reading in light reception output signal of optical touch panel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1019663A JPH02201526A (en) | 1989-01-31 | 1989-01-31 | Method for reading in light reception output signal of optical touch panel |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02201526A true JPH02201526A (en) | 1990-08-09 |
JPH0559446B2 JPH0559446B2 (en) | 1993-08-31 |
Family
ID=12005484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1019663A Granted JPH02201526A (en) | 1989-01-31 | 1989-01-31 | Method for reading in light reception output signal of optical touch panel |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02201526A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0594255A (en) * | 1991-03-28 | 1993-04-16 | Minato Electron Kk | Optical touch panel utilizing modulated light beam |
-
1989
- 1989-01-31 JP JP1019663A patent/JPH02201526A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0594255A (en) * | 1991-03-28 | 1993-04-16 | Minato Electron Kk | Optical touch panel utilizing modulated light beam |
Also Published As
Publication number | Publication date |
---|---|
JPH0559446B2 (en) | 1993-08-31 |
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