JPS6239435Y2 - - Google Patents
Info
- Publication number
- JPS6239435Y2 JPS6239435Y2 JP8960280U JP8960280U JPS6239435Y2 JP S6239435 Y2 JPS6239435 Y2 JP S6239435Y2 JP 8960280 U JP8960280 U JP 8960280U JP 8960280 U JP8960280 U JP 8960280U JP S6239435 Y2 JPS6239435 Y2 JP S6239435Y2
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- signal source
- potential
- voltage
- piezoelectric vibrator
- 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
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 101150046174 NIP2-1 gene Proteins 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
Description
【考案の詳細な説明】
本考案は圧電振動子を用いた圧電ブザーの駆動
回路に関し、特にコイルによる共振回路を用いな
いで駆動する回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive circuit for a piezoelectric buzzer using a piezoelectric vibrator, and more particularly to a circuit for driving a piezoelectric buzzer without using a resonant circuit using a coil.
従来、圧電振動子を電子ブザーとして使用する
場合には音圧を高めるためにコイルとの共振回路
を形成し、さらにケースによつて共鳴させる等し
て音を大きくする方法がとられているが、コイル
を用いると全体を小型、特に薄くする事が出来な
いので、電子式卓上計算機に於いては採用しにく
い欠点があつた。 Conventionally, when using a piezoelectric vibrator as an electronic buzzer, methods have been used to increase the sound pressure, such as forming a resonant circuit with a coil and making the piezoelectric vibrator resonate with the case. However, if a coil is used, the overall size cannot be made small, especially thin, so it has a drawback that it is difficult to use it in electronic desktop calculators.
本考案は上記の問題を解決するもので以下図面
を用いて説明する。 The present invention solves the above problems and will be explained below with reference to the drawings.
図に於いて1は電子式卓上計算機のLSIで、キ
ーボード2よりの入力によつて演算を行い、その
出力を表示回路3に与えて結果等の表示を行な
う。4は電源で、例えばリチウム電池によつて直
流電圧VがLSI1及びトランジスタTr及び抵抗R
1等に供給される。 In the figure, reference numeral 1 denotes an LSI of an electronic desktop calculator, which performs calculations based on input from a keyboard 2, and provides its output to a display circuit 3 to display results and the like. 4 is a power supply, for example, a lithium battery provides DC voltage V to LSI 1, transistor Tr, and resistor R.
Supplied to 1st class.
トランジスタTrのベースは抵抗R2を介して
LSI1のブザー駆動用の信号端子Tに接続されて
おり、トランジスタTrは信号端子Tがハイレベ
ルVH(VH≒V)の時オフし、一方信号端子Tが
ローレベルVL(VL=0)の時オンする。5は圧
電振動子で、信号端子Tに一方の電極aが接続さ
れ、トランジスタTrと抵抗R1との接続点Cに
他方の電極bが接続されている。R3は抵抗であ
る。6は電源スイツチであるが、時計機能も兼用
している場合は不要である。 The base of the transistor Tr is connected via the resistor R2.
It is connected to the signal terminal T for driving the buzzer of LSI1, and the transistor Tr is turned off when the signal terminal T is at a high level V H (V H ≒V), while the signal terminal T is at a low level V L (V L = Turns on when 0). A piezoelectric vibrator 5 has one electrode a connected to a signal terminal T, and the other electrode b connected to a connection point C between the transistor Tr and the resistor R1. R3 is a resistance. Reference numeral 6 is a power switch, but it is not necessary if the watch also functions as a clock.
次に動作を説明する。まずブザーを用いない場
合には、信号端子Tはハイレベルに維持されてト
ランジスタTrはオフしておりトランジスタTrと
抵抗R1との接続点CはローレベルVLであり、
圧電振動子5には相対的に電極a側が正、電極b
側が負となつて直流電圧が印加されているが、振
動しないので音は発生しない。この状態では圧電
振動子5に常に直流電圧が与えられているので不
都合と考えられる場合には、直流を遮断するため
のコンデンサを直列に接続しても良い。 Next, the operation will be explained. First, when the buzzer is not used, the signal terminal T is maintained at a high level, the transistor Tr is turned off, and the connection point C between the transistor Tr and the resistor R1 is at a low level V L.
In the piezoelectric vibrator 5, the electrode a side is relatively positive, and the electrode b side is relatively positive.
Although the side is negative and a DC voltage is applied, there is no vibration and no sound is generated. In this state, a DC voltage is always applied to the piezoelectric vibrator 5, so if this is considered to be inconvenient, a capacitor for cutting off the DC voltage may be connected in series.
キー入力の際又は桁数オーバー等によりブザー
を鳴らす場合、信号端子Tに交流信号(通常パル
ス信号)が与えられ、第2図イに示すように信号
端子Tの電圧はハイレベルVHとローレベルVLを
繰り返す。出力がローレベルVLとなるとトラン
ジスタTrはオンし、接続点CはハイレベルVHに
なる。このため圧電振動子5には電極a側が負、
電極b側が正となり、信号端子Tの出力がハイレ
ベルの場合とは逆になる。第2図ロ,ハは電極
a,bの電圧波形を示している。このため圧電振
動子5には信号端子Tがハイレベルの時の電圧と
ローレベルの時の電圧が重畳されて、第2図ニに
示すように電極bを基準とした電極aとの電位差
の相対的変化が電源4の電圧の約2倍となり、パ
ルス信号によつてトランジスタTrがオン、オフ
する度に電源4の2倍の電圧で駆動する事にな
る。つまり圧電振動子5は一種のコンデンサと見
なされるので一方の電圧で充電され他方の電圧で
逆充電されると、電荷の移動量が2倍となり、電
源4の約2倍の電圧で駆動した事と同一となる。 When the buzzer sounds when a key is input or when the number of digits is exceeded, an AC signal (usually a pulse signal) is applied to the signal terminal T, and the voltage at the signal terminal T changes from high level V H to low level as shown in Figure 2 A. Repeat level V L. When the output becomes a low level V L , the transistor Tr is turned on, and the connection point C becomes a high level V H. Therefore, the piezoelectric vibrator 5 has a negative electrode a side,
The electrode b side is positive, which is opposite to the case where the output of the signal terminal T is high level. 2B and 2C show the voltage waveforms of electrodes a and b. Therefore, the voltage when the signal terminal T is at a high level and the voltage when it is at a low level are superimposed on the piezoelectric vibrator 5, and as shown in FIG. The relative change is approximately twice the voltage of the power source 4, and each time the transistor Tr is turned on and off by the pulse signal, it is driven with twice the voltage of the power source 4. In other words, the piezoelectric vibrator 5 is considered a type of capacitor, so when it is charged with one voltage and reversely charged with the other voltage, the amount of charge transfer is doubled, and it is driven at approximately twice the voltage of the power source 4. is the same as
以上の如く、本考案はブザー駆動用のパルス信
号を発生する信号源にベース側を接続し、抵抗と
の直列回路を形成するトランジスタと、信号源及
び直列回路に直流電圧を供給する電源と、トラン
ジスタと抵抗との接続点と信号源との間に挿入さ
れた圧電振動子とより成り、信号源の電位がハイ
レベルの時トランジスタをオフにして前記接続点
の電位をローレベルとし、信号源の電位がローレ
ベルの時トランジスタをオンにして前記接続点の
電位をハイレベルにして圧電振動子を駆動する事
を特徴とするもので、コイルが不要となり、電子
式卓上計算機等に使用すればその薄型化を計るこ
とができ、しかも音の出力は大きく、従来と同様
に使用する事ができるので実用的効果大である。 As described above, the present invention includes a transistor whose base side is connected to a signal source that generates a pulse signal for driving a buzzer and forms a series circuit with a resistor, a power supply that supplies DC voltage to the signal source and the series circuit, It consists of a piezoelectric vibrator inserted between a connection point between a transistor and a resistor and a signal source, and when the potential of the signal source is at a high level, the transistor is turned off, the potential at the connection point is set to a low level, and the signal source is turned off. It is characterized by turning on the transistor when the potential of the connection point is low level and driving the piezoelectric vibrator by setting the potential of the connection point to high level, eliminating the need for a coil and making it suitable for use in electronic desktop calculators, etc. It has a great practical effect because it can be made thinner, has a large sound output, and can be used in the same way as before.
第1図は本考案の一実施例を示す回路図、第2
図は第1図の要部出力波形図である。
1……LSI、2……キーボード、3……表示回
路、4……電源、5……圧電振動子、Tr……ト
ランジスタ、R1,R2,R3……抵抗。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is an output waveform diagram of the main part of FIG. 1. 1...LSI, 2...keyboard, 3...display circuit, 4...power supply, 5...piezoelectric vibrator, Tr...transistor, R1, R2, R3...resistance.
Claims (1)
ベース側を接続し、抵抗との直列回路を形成する
トランジスタと、前記信号源及び前記直列回路に
直流電圧を供給する電源と、前記トランジスタと
前記抵抗の接続点と前記信号源との間に挿入され
た圧電振動子とより成り、前記信号源の電位がハ
イレベルの時前記トランジスタをオフにして前記
接続点の電位をローレベルとし、前記信号源の電
位がローレベルの時前記トランジスタをオンにし
て前記接続点の電位をハイレベルとして前記圧電
振動子を駆動する事を特徴とする圧電ブザーの駆
動回路。 a transistor whose base side is connected to a signal source that generates a pulse signal for driving a buzzer and forms a series circuit with a resistor; a power source that supplies DC voltage to the signal source and the series circuit; and a transistor and the resistor. and a piezoelectric vibrator inserted between a connection point and the signal source, and when the potential of the signal source is high level, the transistor is turned off, the potential of the connection point is low level, and the signal source A drive circuit for a piezoelectric buzzer, characterized in that when a potential at a low level, the transistor is turned on, and a potential at the connection point is set at a high level to drive the piezoelectric vibrator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8960280U JPS6239435Y2 (en) | 1980-06-25 | 1980-06-25 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8960280U JPS6239435Y2 (en) | 1980-06-25 | 1980-06-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5711597U JPS5711597U (en) | 1982-01-21 |
JPS6239435Y2 true JPS6239435Y2 (en) | 1987-10-07 |
Family
ID=29451629
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8960280U Expired JPS6239435Y2 (en) | 1980-06-25 | 1980-06-25 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6239435Y2 (en) |
-
1980
- 1980-06-25 JP JP8960280U patent/JPS6239435Y2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5711597U (en) | 1982-01-21 |
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