JPS5843773B2 - Light Pen Shingo Kenshiyutsunoshiki Ichisetsuteihoushiki - Google Patents
Light Pen Shingo Kenshiyutsunoshiki IchisetsuteihoushikiInfo
- Publication number
- JPS5843773B2 JPS5843773B2 JP50117725A JP11772575A JPS5843773B2 JP S5843773 B2 JPS5843773 B2 JP S5843773B2 JP 50117725 A JP50117725 A JP 50117725A JP 11772575 A JP11772575 A JP 11772575A JP S5843773 B2 JPS5843773 B2 JP S5843773B2
- Authority
- JP
- Japan
- Prior art keywords
- light pen
- crt
- light
- brightness
- kenshiyutsunoshiki
- 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.)
- Expired
Links
Landscapes
- Position Input By Displaying (AREA)
Description
【発明の詳細な説明】
本発明はライトペンを備えたＣＲＴディスプレイのライ
トペン信号検出装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light pen signal detection device for a CRT display equipped with a light pen.
従来から、ＣＲＴディスプレイ装置には輝度調整機能が
設けられており、オペレータ等により輝度調整が行なわ
れている。Conventionally, CRT display devices have been provided with a brightness adjustment function, and brightness adjustment is performed by an operator or the like.
ライトペンについては、光から変換された電気信号には
雑音成分が多く含まれているため、一定値以下の信号は
雑音と見做して無視する閾値回路が設けられている。As for light pens, since electrical signals converted from light contain many noise components, a threshold circuit is provided that ignores signals below a certain value as noise.
この閾値は一般に固定されており、オペレータによって
変化させることはできない。This threshold is generally fixed and cannot be changed by the operator.
ＣＲＴの輝度を上げると、ライトペンで指した位置以外
の輝点からの入射光が多くなり、光から変換された電気
信号が閾値を超えて誤動作を生ずることがある。When the brightness of a CRT is increased, more light enters from a bright spot other than the position pointed with the light pen, and an electrical signal converted from the light may exceed a threshold value, causing malfunction.
また、ＣＲＴの輝度を下げると、ライトペンで指した位
置の輝点からの入射光が少なくなり、光から変換された
電気信号が閾値に到らず、ライトペンによる検出が不可
能となることがある。In addition, when the brightness of the CRT is lowered, the incident light from the bright spot at the position pointed with the light pen will decrease, and the electrical signal converted from the light will not reach the threshold, making it impossible to detect with the light pen. There is.
従って、本発明の目的はＣＲＴの輝度調整を行なっても
、ライトペン検出の誤動作および検出不能の状態を発生
しにくくする手段を提供することにある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a means for preventing malfunctions in light pen detection and non-detection states even when the brightness of a CRT is adjusted.
本発明は、ＣＲＴの輝度調整とライトペンよりの検出信
号を認識する閾値調整を連動させ、ＣＲＴの輝度に応じ
て閾値を変化させようとするものである。The present invention is intended to link the brightness adjustment of a CRT with the threshold value adjustment for recognizing a detection signal from a light pen, and to change the threshold value in accordance with the brightness of the CRT.
本発明の実施例のブロック図を第１図に示す。A block diagram of an embodiment of the invention is shown in FIG.
映像信号１は映像増幅回路２によって増幅されＣＲＴユ
ニット３に与えられ、表示される。A video signal 1 is amplified by a video amplification circuit 2 and given to a CRT unit 3 for display.
映像増幅回路２は、端子■に加えられた映像信号が端子
Ｃに加えられた基準電圧に応じた利得で増幅されて端子
Ｏから出力されるもので公知のものである。The video amplification circuit 2 is a well-known circuit in which a video signal applied to the terminal (2) is amplified with a gain corresponding to a reference voltage applied to the terminal (C), and is output from the terminal (0).
従って端子Ｃに加える電圧を変化させることにより、Ｃ
ＲＴの輝度調整を行なうことができる。Therefore, by changing the voltage applied to terminal C, C
RT brightness adjustment can be performed.
ライトペン４によって、光から変換された電気信号は、
増幅回路５によって増幅され、比較回路６に加えられる
。The electrical signal converted from light by the light pen 4 is
The signal is amplified by the amplifier circuit 5 and applied to the comparison circuit 6.
比較回路６は、端子■１および端子Ｉ２に加えられる電
圧を比較し、端子１１に加えられる電圧が端子■２に加
えられる電圧より高い場合のみ、端子Ｏに信号を出力す
るもので公知のものである。Comparison circuit 6 is a known type that compares the voltages applied to terminal 1 and I2 and outputs a signal to terminal O only when the voltage applied to terminal 11 is higher than the voltage applied to terminal 2. It is.
従って、端子■２に加える電圧を変化させることにより
、ライトペンよりの検出信号を認識する閾値を調整する
ことができる。Therefore, by changing the voltage applied to terminal 2, the threshold value for recognizing the detection signal from the light pen can be adjusted.
可変電圧発生回路７と８は連動しており、例えば２連形
の可変抵抗器を使用したものでオペレータが単一のつま
みによって調整可能としたものである。The variable voltage generating circuits 7 and 8 are interlocked, for example, using two variable resistors, which can be adjusted by the operator using a single knob.
可変電圧発生回路７と８を連動させ、ＣＲＴの輝度を高
くしたときは、ライトペン検出信号に対する閾値を上げ
、輝度を低くしたときは閾値を下げるため、誤検出およ
び検出不可となることが少なくなる。The variable voltage generation circuits 7 and 8 are linked together to raise the threshold for the light pen detection signal when the brightness of the CRT is increased, and to lower the threshold when the brightness is lowered, thereby reducing false detection and failure to detect. Become.
なお、本実施例では、可変電圧発生回路を２回路設ける
ものとしたが、１回路にすることも容易に可能である。In this embodiment, two variable voltage generating circuits are provided, but it is easily possible to use only one circuit.
図は本発明の一実施例を示す図である。
１：映像信号、２；映像増幅回路、３；ＣＲＴユニット
、４；ライトペン、５；増幅回路、６；比較回路、γ、
８；可変電圧発生回路、９；ライトペン検出信号。The figure shows an embodiment of the present invention. 1: video signal, 2: video amplification circuit, 3: CRT unit, 4: light pen, 5: amplifier circuit, 6: comparison circuit, γ,
8; variable voltage generation circuit; 9; light pen detection signal.
Claims (1)
によりあらかじめ定めた処理を行なう機能を有するディ
スプレイ装置において、ＣＲＴの輝度を変化させる手段
とライトペンによって光から変換された電気信号を認識
するための閾値を変化させる手段とを設け、ＣＲＴの輝
度を上げたときは上記閾値を高くし、ＣＲＴの輝度を下
げたときには上記閾値を低くするように前記手段を連動
させることを特徴とするライトペン信号検出の閾値設定
方式。1. In a display device that has a function of performing predetermined processing by detecting a bright spot on a CRT with a light pen, there is a means for changing the brightness of the CRT and a means for recognizing the electrical signal converted from light by the light pen. A light pen signal comprising means for changing a threshold value, and the means are interlocked so that when the brightness of the CRT is increased, the threshold value is increased, and when the brightness of the CRT is decreased, the threshold value is lowered. Detection threshold setting method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50117725A JPS5843773B2 (en) | 1975-10-01 | 1975-10-01 | Light Pen Shingo Kenshiyutsunoshiki Ichisetsuteihoushiki |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50117725A JPS5843773B2 (en) | 1975-10-01 | 1975-10-01 | Light Pen Shingo Kenshiyutsunoshiki Ichisetsuteihoushiki |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5243325A JPS5243325A (en) | 1977-04-05 |
| JPS5843773B2 true JPS5843773B2 (en) | 1983-09-29 |
Family
ID=14718731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50117725A Expired JPS5843773B2 (en) | 1975-10-01 | 1975-10-01 | Light Pen Shingo Kenshiyutsunoshiki Ichisetsuteihoushiki |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5843773B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07897B1 (en) * | 1988-12-16 | 1995-01-11 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4949544A (en) * | 1972-09-14 | 1974-05-14 | ||
| JPS4973030A (en) * | 1972-11-13 | 1974-07-15 |
-
1975
- 1975-10-01 JP JP50117725A patent/JPS5843773B2/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4949544A (en) * | 1972-09-14 | 1974-05-14 | ||
| JPS4973030A (en) * | 1972-11-13 | 1974-07-15 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5243325A (en) | 1977-04-05 |
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