JPS5810099Y2 - Display device with alarm - Google Patents
Display device with alarmInfo
- Publication number
- JPS5810099Y2 JPS5810099Y2 JP1977007255U JP725577U JPS5810099Y2 JP S5810099 Y2 JPS5810099 Y2 JP S5810099Y2 JP 1977007255 U JP1977007255 U JP 1977007255U JP 725577 U JP725577 U JP 725577U JP S5810099 Y2 JPS5810099 Y2 JP S5810099Y2
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting diode
- alarm
- transistor
- display device
- 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
- Measurement Of Current Or Voltage (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Alarm Systems (AREA)
- Indicating Measured Values (AREA)
Description
【考案の詳細な説明】
本考案は並列接続されたトランジスタと発光素子との組
が複数組継続接続されて戊り、且つアラームを有する表
示装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device in which a plurality of pairs of transistors and light emitting elements connected in parallel are continuously connected, and has an alarm.
一般に例えば温度を表示する表示装置に取付けられるア
ラーム装置はアラーム温度が変えられる可変設定型であ
った。Generally, an alarm device attached to a display device for displaying temperature, for example, is of a variable setting type in which the alarm temperature can be changed.
しかし常に同じ温度に設定されるものに用いる表示装置
を大量に生産する場合、可変設定型は不必要であり、コ
ストも高くなる欠点を有していた。However, when producing large quantities of display devices that are always set at the same temperature, the variable setting type is unnecessary and has the drawback of increasing costs.
本考案は上述した欠点に鑑みて為されたものであり、従
来の欠点を除去したアラーム付表示装置を提供するもの
である。The present invention has been devised in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a display device with an alarm that eliminates the conventional drawbacks.
以下図面を参照して本考案を詳細に説明する。The present invention will be described in detail below with reference to the drawings.
図は本考案の実施例を示す回路図である。The figure is a circuit diagram showing an embodiment of the present invention.
本実施例はトランジスタＴｒ、〜Ｔｒｏと、発光ダイオ
ードＬＤ１〜ＬＤｎと、抵抗Ｒ１〜Ｒｏと、定電流装置
１と、トランジスタ２と、抵抗３と、負荷抵抗４とから
成る。This embodiment includes transistors Tr, -Tro, light emitting diodes LD1 - LDn, resistors R1 - Ro, constant current device 1, transistor 2, resistor 3, and load resistor 4.
トランジスタＴｒ１〜ＴｒｎはＰＮＰ型のトランジスタ
であり、各々のトランジスタＴｒ１〜Ｔｒ、には発光ダ
イオードＬＤ、〜ＬＤｎが並列に接続され、並列に接続
されたトランジスタと発光ダイオードとがｎ段継続接続
されている。The transistors Tr1 to Trn are PNP type transistors, and light emitting diodes LD, to LDn are connected in parallel to each of the transistors Tr1 to Tr, and n stages of transistors and light emitting diodes connected in parallel are continuously connected. There is.
最下段のトランジスタＴｒ１のコレクタと発光ダイオー
ドＬＤ、のカソードとが接地され、最上段のトランジス
タＴｒｏのエミッタと発光ダイオード士り。The collector of the lowest stage transistor Tr1 and the cathode of the light emitting diode LD are grounded, and the emitter of the highest stage transistor Tro and the light emitting diode are grounded.
アノードとが定電流装置１に接続されて電源電圧Ｖが印
加される。The anode is connected to a constant current device 1 and a power supply voltage V is applied thereto.
トランジスタＴｒ１〜Ｔｒｎの各々のベースには抵抗Ｒ
１〜Ｒｎを介して入力信号ｉｎが印加される。A resistor R is connected to the base of each of the transistors Tr1 to Trn.
An input signal in is applied via 1 to Rn.
この入力信号ｉｎは例えば温度の変化に対応して変化す
る電圧である。This input signal in is, for example, a voltage that changes in response to changes in temperature.
斯様の如く構成された表示装置の所望の発光ダイオード
ＬＤｎ−１にトランジスタ２を取付ける。A transistor 2 is attached to a desired light emitting diode LDn-1 of the display device constructed as described above.
トランジスタ２はＮＰＮ型のトランジスタであり、エミ
ッタは発光ダイオードＬＤｎ−２のカソードに接続され
、ベースは抵抗３を介して発光ダイオードＬＤｏ−２の
アノードに接続され、更にコレクタは負荷抵抗４を介し
て電源電圧■が印加され、アラーム出力ｏｕｔとなる。The transistor 2 is an NPN type transistor, and its emitter is connected to the cathode of the light emitting diode LDn-2, its base is connected to the anode of the light emitting diode LDo-2 via a resistor 3, and its collector is connected to the anode of the light emitting diode LDo-2 via a load resistor 4. The power supply voltage ■ is applied, and the alarm output becomes out.
次に上述の如く構成されたアラーム付表示装置の動作を
説明する。Next, the operation of the alarm display device configured as described above will be explained.
まず入力信号ｉｎの電圧がＯ■から徐々に増加してゆく
と、トランジスタＴｒ１の立ち上がり電圧までは、トラ
ンジスタＴｒ１〜Ｔｒｏはすべて導通状態であり電流は
トランジスタＴｒ、〜Ｔｒｏを流れるので発光ダイオー
ドＬＤ１〜ＬＤｎは発光しない。First, when the voltage of the input signal in gradually increases from O■, until the rising voltage of the transistor Tr1, the transistors Tr1 to Tro are all in a conductive state and the current flows through the transistors Tr and Tro, so the light emitting diodes LD1 to LDn does not emit light.
入力信号ｉｎの電圧がトランジスタＴｒ１の立ち上がり
電圧を超えると、トランジスタＴｒ、は遮断状態となり
電流は発光ダイオードＬＤ１を流れるので発光ダイオー
ド士Ｄ１が発光する。When the voltage of the input signal in exceeds the rising voltage of the transistor Tr1, the transistor Tr is cut off and current flows through the light emitting diode LD1, so that the light emitting diode D1 emits light.
更に入力信号ｉｎの電圧が発光ダイオードＬＤ１の立ち
上がり電圧とトランジスタＴｒ２の立ち上がり電圧の和
より大きくなるとトランジスタＴｒ２は遮断状態になり
電流は発光ダイオードＬＤ２．ＬＤ１を流れるのでこれ
らが発光する。Furthermore, when the voltage of the input signal in becomes larger than the sum of the rising voltage of the light emitting diode LD1 and the rising voltage of the transistor Tr2, the transistor Tr2 is cut off and the current flows to the light emitting diode LD2. These light emit light as they flow through LD1.
以下同様にして発光ダイオードＬＤｏ−２が発光すると
発光ダイオードＬＤｎ２の立ち上がり電圧より小さい立
上がり電圧を有するトランジスタ２が導通状態になり、
電源電圧■からコレクタ電流が負荷抵抗４を介して流れ
る。Similarly, when the light emitting diode LDo-2 emits light, the transistor 2 having a rising voltage smaller than the rising voltage of the light emitting diode LDn2 becomes conductive.
A collector current flows from the power supply voltage (■) through the load resistor (4).
従ってアラーム出力ｏｕｔは電源電圧Ｖから負荷抵抗４
に依る電圧降下分だけ下がった電位となり、これをアラ
ーム信号として取出すものである。Therefore, the alarm output out is from the power supply voltage V to the load resistance 4.
The potential is lowered by the voltage drop caused by the voltage drop, and this is taken out as an alarm signal.
これに依り発光ダイオードＬＤｏ−２が発光した時の入
力信号ｉｎの電圧の大きさ即ちこの電圧に対応する温度
に依ってアラームが行なわれるものである。Accordingly, an alarm is issued depending on the magnitude of the voltage of the input signal in when the light emitting diode LDo-2 emits light, that is, the temperature corresponding to this voltage.
また発光ダイオードＬＤｎ−２のアノードとトランジス
タ２のベースとの間に挿入された抵抗３の抵抗値を適当
に選ぶことにより電流をトランジスタ２のベースに分流
して、発光ダイオードＬＤｎ−２に流れる電流を減少さ
せれば、発光ダイオードＬＤ、 ２の発光輝度が他の発
光ダイオードより低くなるので、アラームの行なわれる
点を超えて発光ダイオードが発光している時はアラーム
の行なわれる点が明確になると共に、それをどの位超え
ているが一目で゛わがるので゛ある。In addition, by appropriately selecting the resistance value of the resistor 3 inserted between the anode of the light emitting diode LDn-2 and the base of the transistor 2, the current is shunted to the base of the transistor 2, and the current flowing to the light emitting diode LDn-2 is By decreasing the value, the luminance of the light emitting diode LD,2 becomes lower than that of the other light emitting diodes, so when the light emitting diode is emitting light beyond the point at which an alarm is issued, the point at which an alarm is issued becomes clear. At the same time, you can tell at first glance how much it exceeds.
上述の如く本考案に依れば所望の発光素子にトランジス
タを接続することに依り簡単にアラームが行なえ、アラ
ームの行なわれる点を明確になると共に量産性が高くコ
ストも低くなる実用的効果大なるものである。As described above, according to the present invention, an alarm can be easily generated by connecting a transistor to a desired light emitting element, and the point at which an alarm is to be generated is made clear, and the practical effects of high mass production and low cost are achieved. It is something.
図面は本考案の実施例を示す回路図である。
１・・・・・・定電流装置、２・・・・・・トランジス
タ、３・・・・・・抵抗、４・・・・・・負荷抵抗であ
る。The drawing is a circuit diagram showing an embodiment of the present invention. 1... Constant current device, 2... Transistor, 3... Resistor, 4... Load resistor.
Claims (1)
複数組継続接続されて戊る表示装置に於いて、所望の発
光ダイオードの一端に抵抗を介してベースが接続され、
他端にエミッタが接続された別のトランジスタを設け、
前記所望の発光ダイオードの発光により、前記別のトラ
ンジスタの負荷からアラーム出力を取り出すと共に、前
記所望の発光ダイオードの発光輝度を他のそれよりも低
下させることを特徴とするアラーム付表示装置。In a display device in which a plurality of pairs of transistors and light emitting diodes connected in parallel are continuously connected, a base is connected to one end of a desired light emitting diode via a resistor,
Provide another transistor with the emitter connected to the other end,
A display device with an alarm, characterized in that the light emission of the desired light emitting diode causes an alarm output to be taken out from the load of the other transistor, and the light emission brightness of the desired light emitting diode is lowered than that of the other transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977007255U JPS5810099Y2 (en) | 1977-01-20 | 1977-01-20 | Display device with alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977007255U JPS5810099Y2 (en) | 1977-01-20 | 1977-01-20 | Display device with alarm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS53101557U JPS53101557U (en) | 1978-08-16 |
| JPS5810099Y2 true JPS5810099Y2 (en) | 1983-02-24 |
Family
ID=28693916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1977007255U Expired JPS5810099Y2 (en) | 1977-01-20 | 1977-01-20 | Display device with alarm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5810099Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4918048A (en) * | 1972-04-13 | 1974-02-18 |
-
1977
- 1977-01-20 JP JP1977007255U patent/JPS5810099Y2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4918048A (en) * | 1972-04-13 | 1974-02-18 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS53101557U (en) | 1978-08-16 |
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