JP4493087B2 - In-vehicle alarm device - Google Patents

In-vehicle alarm device Download PDF

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JP4493087B2
JP4493087B2 JP2004372313A JP2004372313A JP4493087B2 JP 4493087 B2 JP4493087 B2 JP 4493087B2 JP 2004372313 A JP2004372313 A JP 2004372313A JP 2004372313 A JP2004372313 A JP 2004372313A JP 4493087 B2 JP4493087 B2 JP 4493087B2
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vehicle
piezoelectric buzzer
switch
circuit
terminal side
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JP2006176026A (en
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則夫 砂川
忠 高橋
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Isuzu Motors Ltd
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本発明は、車載用警報装置に関し、例えば車両の後退時に発する警報の発生源であるブザーの電蝕を回避すると共に、誤動作の防止、省電力化を図るようにした、車載用警報装置に関するものである。   The present invention relates to an on-vehicle alarm device, for example, to an on-vehicle alarm device that avoids electric corrosion of a buzzer that is a source of an alarm that is generated when a vehicle moves backward, and that prevents malfunction and saves power. It is.

バス、トラック等の大型車両は車体の大きさ、構造上、周囲の視界が狭く、運転には相当の注意を要する。従って、運転時、警報音を発して周囲に注意を喚起する車載用警報装置が不可欠のものとなっている。
例えば、交差点において、左折時に自転車、バイクなどの二輪車、あるいは歩行者の巻き込み事故を避けるために、警報音を発し、また、後退時にも、警報音を発して周囲に注意を喚起するようにしている。
そこで、このような車載用警報装置の一例として、後退時における警報装置としては、大型車両の後部に設けられる尾灯や、尾灯近傍に前記警報音を発生する手段として、例えばブザーが配設されている。
特開平６−２６２９７７号 ここでは、トラック用尾灯に必要的に取り付けられる電装部品と共に、後退を聴覚的に知らせるバックブザーが配設されている。 このブザーは、通常、圧電ブザーといわれるもので、交番電圧が印加されることで警報音を発する圧電振動板を備えている。 Large vehicles such as buses and trucks have a narrow view of the surroundings due to the size and structure of the vehicle body, and require considerable care in driving. Accordingly, an in-vehicle alarm device that emits an alarm sound and alerts the surroundings during driving is indispensable.
For example, at intersections, to avoid accidents involving bicycles, motorcycles and other two-wheeled vehicles or pedestrians when making a left turn, an alarm sound is generated, and an alarm sound is also generated to alert the surroundings when reversing. Yes.
Therefore, as an example of such an in-vehicle alarm device, as a warning device at the time of reversing, for example, a buzzer is provided as a taillight provided at the rear of a large vehicle or a means for generating the alarm sound in the vicinity of the taillight. Yes.
JP, 6-262977, A Here, the back buzzer which audibly notifies retreat is arranged with the electrical equipment attached to the taillight for trucks. This buzzer is usually called a piezoelectric buzzer and includes a piezoelectric diaphragm that emits an alarm sound when an alternating voltage is applied.

上記ブザーは、トラック後退時、バックギヤにシフトされることで、トラック用尾灯のブラケットに搭載しているブザー駆動回路がオンとなって、駆動電圧がブザーに供給され、圧電振動板が振動して警報音を発生するようになっているが、前記圧電振動板は露出しており、また前記ブザーを制御するスイッチが電源側でなくアース回路側にあった場合、例えば、冬季、降雪によって圧電振動板とブザー駆動回路を搭載するブラケットとの間にリーク電流が流れることがある。
このとき、前記ブザー駆動回路へは常時車載用電源が印加されているので、駐車した状態でも微弱な電流が流れ、ブザーが誤動作することがある。
そして、このような事態が繰り返されると、圧電振動板は電蝕を引き起こし、短期のうちに、使い物にならなくなるおそれがあり、車載用電源の浪費ともなる。
本発明は、このような課題を解決するために提案されたものであって、常時電源が印加状態にあることに起因する、車両搭載のブザーの電蝕を回避し、且つ誤動作を防止し、併せて省電力化を図った、車載用警報装置を提供することを目的とする。 When the buzzer is shifted to the back gear when the truck moves backward, the buzzer drive circuit mounted on the bracket of the truck tail lamp is turned on, the drive voltage is supplied to the buzzer, and the piezoelectric diaphragm vibrates. An alarm sound is generated, but the piezoelectric diaphragm is exposed, and when the switch for controlling the buzzer is on the ground circuit side instead of the power source side, for example, during the winter, the piezoelectric vibration is caused by snowfall. Leakage current may flow between the plate and the bracket on which the buzzer drive circuit is mounted.
At this time, since the vehicle-mounted power supply is constantly applied to the buzzer drive circuit, a weak current may flow even in a parked state, and the buzzer may malfunction.
If such a situation is repeated, the piezoelectric diaphragm causes electric corrosion, which may become unusable within a short period of time, resulting in wasted power for the vehicle.
The present invention has been proposed in order to solve such a problem, and avoids electric corrosion of a buzzer mounted on a vehicle due to the constant application of power, and prevents malfunction. In addition, an object of the present invention is to provide an in-vehicle alarm device that saves power.

前記した課題を達成するために、本発明では、請求項１において、車両適所に搭載して、車両の動作時に周囲に警報を発する圧電ブザーと、この圧電ブザーに駆動電圧を印加するための圧電ブザー駆動回路を備え、この圧電ブザー駆動回路は、スイッチ回路を介して車載用電源と接続し、このスイッチ回路は、車載用電源の＋端子側にＰＮＰトランジスタのエミッタ側を接続し、前記ＰＮＰトランジスタのベース側を第一のダイオード、抵抗を介して、一方の端子側を車体側へ接地した遮断スイッチの他方の端子側に接続して、前記第一のダイオードが、前記遮断スイッチの他方の端子側への整流作用を有するようにし、前記ＰＮＰトランジスタのコレクタ側を前記圧電ブザー駆動回路の＋端子側に接続すると共に、前記圧電ブザー駆動回路の−端子側を、第二のダイオードを介して前記遮断スイッチの他方の端子側に接続して、前記第二のダイオードが、前記遮断スイッチの他方の端子側への整流作用を有するようにし、前記圧電ブザーは駆動電圧が印加されたとき警報を発すると共に、車体側への接地から独立して前記圧電ブザー駆動回路と接続し、前記圧電ブザー駆動回路及び前記スイッチ回路がいずれも、前記遮断スイッチがオフの場合は車体側への接地から独立し、前記遮断スイッチがオンの場合は、前記圧電ブザー駆動回路の−端子側及び前記ＰＮＰトランジスタのベース側が前記遮断スイッチから車体側へ接地するように構成した車載用警報装置を提案する。
また本発明では、請求項２において、前記遮断スイッチは、バックギヤへのシフト操作に連動して、圧電ブザー駆動回路へ車載用電源を印加する構成とした車載用警報装置を提案する。
To achieve the above object, according to the present invention, in claim 1, a piezoelectric buzzer which is mounted at a proper position in the vehicle and issues a warning to the surroundings during operation of the vehicle, and a piezoelectric for applying a driving voltage to the piezoelectric buzzer. A buzzer driving circuit is provided, and this piezoelectric buzzer driving circuit is connected to an in-vehicle power source via a switch circuit, and this switch circuit connects the emitter side of the PNP transistor to the + terminal side of the in-vehicle power source, and the PNP transistor the base side of the first diode via a resistor, and connected to the other terminal side of the cut-off switch to ground one terminal side to the vehicle body, said first diode, the other terminal of the blocking switch to have a rectification action in the side, with connecting collector of the PNP transistor to the positive terminal side of the piezoelectric buzzer drive circuit, the piezoelectric buzzer drive circuit - the terminal side, connected via a second diode to the other terminal side of the cut-off switch, the second diode, to have a rectification action to the other terminal side of the isolation switch, the The piezoelectric buzzer issues an alarm when a drive voltage is applied, and is connected to the piezoelectric buzzer drive circuit independently from grounding to the vehicle body. Both the piezoelectric buzzer drive circuit and the switch circuit are connected to the cutoff switch. When off, it is independent from grounding to the vehicle body side, and when the cutoff switch is on, the negative terminal side of the piezoelectric buzzer drive circuit and the base side of the PNP transistor are grounded from the cutoff switch to the vehicle body side A vehicle-mounted alarm device is proposed.
According to a second aspect of the present invention, there is provided an in-vehicle alarm device according to claim 2, wherein the cutoff switch applies an in-vehicle power source to the piezoelectric buzzer driving circuit in conjunction with a shift operation to a back gear.

常時電源が印加状態にあることに起因する、車両搭載のブザーの電蝕を回避し、且つ誤動作を防止し、併せて省電力化を図った、車載用警報装置を提供することができる。   It is possible to provide an in-vehicle alarm device that avoids electric corrosion of a buzzer mounted on a vehicle due to a constant power supply state, prevents malfunction, and saves power.

請求項１によれば、圧電ブザー駆動回路に通ずるスイッチ回路の−端子側の遮断スイッチをオフにしておけば、ブザー駆動回路に、車載用電源が印加されることはなく、微弱な電流が流れてブザーが誤動作するようなことはない。また、圧電振動板とブザー駆動回路を搭載するブラケットとの間のリーク電流による電蝕を防止することができる。   According to the first aspect, if the cut-off switch on the negative terminal side of the switch circuit connected to the piezoelectric buzzer driving circuit is turned off, a vehicle-mounted power source is not applied to the buzzer driving circuit, and a weak current flows. The buzzer will not malfunction. Further, it is possible to prevent electrolytic corrosion due to a leakage current between the piezoelectric diaphragm and the bracket on which the buzzer driving circuit is mounted.

また、車両後退時、バックギヤオンでスイッチ回路の−端子側に遮断スイッチがオン状態になることによって、圧電ブザー駆動回路が作動し、圧電ブザーから警報音を発することができる。   Further, when the vehicle is moving backward, the back switch is turned on and the cutoff switch is turned on to the negative terminal side of the switch circuit, so that the piezoelectric buzzer drive circuit is activated and an alarm sound can be generated from the piezoelectric buzzer.

請求項２によれば、車両を後退させるとき、ギヤチェンジレバーをバックの位置にシフトすることで初めて、圧電ブザー駆動回路へ車載用電源を印加する構成であるので、車載用電源の省電力化に寄与することができる。
According to the second aspect , when the vehicle is moved backward, the vehicle-mounted power supply is applied to the piezoelectric buzzer driving circuit for the first time by shifting the gear change lever to the back position. Can contribute.

以下、本発明にかかる車載用警報装置について、一つの実施の形態を挙げ、添付の図面に基づいて説明する。
図１〜図３に、車両１（トラック、バス）の車体２後部に設けた車載用警報装置３を示す。
この車載用警報装置３は、前記車体２に設けた電装品ボックス４内に搭載され、圧電ブザー駆動回路５と、前記電装品ボックス４外側にブラケット６を介して設けた圧電ブザー７とを備え、この圧電ブザー７に、所定の周波数の電圧を印加して、警報音を発生するようにしている。そして、前記圧電ブザー駆動回路５に、スイッチ回路８を介して車載用電源と接続し、このスイッチ回路８の−端子側に遮断スイッチ９（以下、バックランプスイッチ９）を接続して、このバックランプスイッチ９を介して車体側に接地している。 DESCRIPTION OF EMBODIMENTS Hereinafter, an in-vehicle alarm device according to the present invention will be described with reference to the accompanying drawings, taking one embodiment.
1 to 3 show an in-vehicle alarm device 3 provided at the rear of a vehicle body 2 of a vehicle 1 (truck, bus).
This in-vehicle alarm device 3 is mounted in an electrical component box 4 provided on the vehicle body 2 and includes a piezoelectric buzzer drive circuit 5 and a piezoelectric buzzer 7 provided outside the electrical component box 4 via a bracket 6. A voltage having a predetermined frequency is applied to the piezoelectric buzzer 7 to generate an alarm sound. Then, the piezoelectric buzzer drive circuit 5 is connected to an in-vehicle power source via a switch circuit 8, and a cut-off switch 9 (hereinafter referred to as a back lamp switch 9) is connected to the negative terminal side of the switch circuit 8. The lamp switch 9 is grounded to the vehicle body side.

ここで、圧電ブザー７の一例を概略説明すると、図２に示すように、詳細は図示しないが、例えばケースＣ内に圧電振動板が内蔵され、この圧電振動板は、金属板面に圧電振動子を貼り合わせた構成としている。圧電振動子としては、圧電セラミック板の両主面に電極を形成することにより構成している。   Here, an example of the piezoelectric buzzer 7 will be schematically described. As shown in FIG. 2, although not shown in detail, for example, a piezoelectric diaphragm is built in the case C, and this piezoelectric diaphragm has piezoelectric vibration on the metal plate surface. It is the structure which stuck the child. The piezoelectric vibrator is configured by forming electrodes on both main surfaces of the piezoelectric ceramic plate.

前記圧電ブザー駆動回路５は、詳細は図示しないが例えば圧電ブザー７の容量とコイルＣLにより並列共振回路を構成し、所定の周波数の信号を出力する発振回路１０と、この発振回路１０から、前記所定の周波数の信号をトランジスタＴr1に供給して、前記並列共振回路におけるコイルＣLに周波数に応じた駆動電圧を生起させ、前記圧電ブザー７に、この駆動電圧を印加するようにしている。
すなわち、前記圧電ブザー駆動回路５は、詳細な説明は省略するが、発振回路１０で発生する所定の周波数にかかる出力信号を、前記トランジスタＴr1のベースに供給することで、トランジスタＴr1をオンオフさせ、これに応じたオンオフ電圧が圧電ブザー７と並列のコイルＣLに流れて、コイルＣLに共振周波数にかかる駆動電圧を生起させ、この駆動電圧により圧電ブザー７を鳴動させるようにしている。 Although not shown in detail, the piezoelectric buzzer driving circuit 5 forms a parallel resonant circuit by, for example, the capacitance of the piezoelectric buzzer 7 and the coil CL, and outputs an oscillation signal 10 having a predetermined frequency. A signal having a predetermined frequency is supplied to the transistor Tr1, a drive voltage corresponding to the frequency is generated in the coil CL in the parallel resonance circuit, and this drive voltage is applied to the piezoelectric buzzer 7.
That is, although detailed explanation is omitted, the piezoelectric buzzer driving circuit 5 supplies the output signal of a predetermined frequency generated by the oscillation circuit 10 to the base of the transistor Tr1, thereby turning on and off the transistor Tr1. In response to this, an on / off voltage flows through the coil CL in parallel with the piezoelectric buzzer 7 to generate a drive voltage applied to the resonance frequency in the coil CL, and the piezoelectric buzzer 7 is caused to ring by this drive voltage.

次に、前記スイッチ回路８は、車載用電源の＋端子側にトランジスタＴr2のエミッタを接続し、ベース側にダイオードｄ1、抵抗ｒ1を介して−端子側に接続している。また、前記トランジスタＴr2のエミッタ側とベース側とには、抵抗ｒ2が接続されている。
そして、前記トランジスタＴr2のコレクタ側を前記圧電ブザー駆動回路５の＋側に接続する構成としている。 Next, the switch circuit 8 has the emitter of the transistor Tr2 connected to the + terminal side of the on-vehicle power supply, and is connected to the negative terminal side via a diode d1 and a resistor r1 on the base side. A resistor r2 is connected to the emitter side and the base side of the transistor Tr2.
The collector side of the transistor Tr2 is connected to the + side of the piezoelectric buzzer driving circuit 5.

ここで、前記バックランプスイッチ９について説明する。
バックランプスイッチ９は、車両１を後退させるとき、ギヤチェンジレバーをバックの位置にシフトすることで、連動してオンとなって、圧電ブザー駆動回路５へ車載用電源を印加する構成である。 Here, the back lamp switch 9 will be described.
The back lamp switch 9 is configured to shift the gear change lever to the back position when the vehicle 1 is moved backward, so that the on-vehicle power source is applied to the piezoelectric buzzer drive circuit 5 by shifting the gear change lever to the back position.

以上のような車載用警報装置３において、車両１を後退させる際、ギヤチェンジレバーをバックの位置にシフトすると、バックランプスイッチ９がオンとなり、スイッチ回路８におけるトランジスタＴr2がオンして、車載用電源から圧電ブザー駆動回路５に通ずる印加回路が閉成され、圧電ブザー７から警報音を発することができる。
後退を停止し、バッグギヤからニュートラルに戻されると、前記バックランプスイッチ９がオフとなって、スイッチ回路８におけるトランジスタＴr2がオフとなり、車載用電源から圧電ブザー駆動回路５への印加回路が遮断され、圧電ブザー７からの警報音が停止する。 In the on-vehicle alarm device 3 as described above, when the vehicle 1 is moved backward, if the gear change lever is shifted to the back position, the back lamp switch 9 is turned on, and the transistor Tr2 in the switch circuit 8 is turned on. An application circuit communicating from the power source to the piezoelectric buzzer driving circuit 5 is closed, and an alarm sound can be emitted from the piezoelectric buzzer 7.
When the reverse movement is stopped and the bag gear is returned to neutral, the back lamp switch 9 is turned off, the transistor Tr2 in the switch circuit 8 is turned off, and the application circuit from the in-vehicle power supply to the piezoelectric buzzer drive circuit 5 is cut off. The alarm sound from the piezoelectric buzzer 7 stops.

このようにしておけば、スイッチ回路８におけるトランジスタＴr2がオフ状態であるから、圧電ブザー駆動回路５へは、車載用電源からの電圧は印加されず、車載用電源からのリーク電流は流れることはない。
従って、圧電ブザー駆動回路５には、電流が流れることはないので、圧電ブザー７の圧電振動板に雪が積もって車体と短絡状態となっても、微弱な短絡電流は流れることはなく、圧電ブザー７の誤動作を防ぐと共に、電蝕の発生を回避することができ、車載用電源の省電力化にもつながる。 By doing so, since the transistor Tr2 in the switch circuit 8 is in the OFF state, the voltage from the in-vehicle power source is not applied to the piezoelectric buzzer driving circuit 5, and the leak current from the in-vehicle power source does not flow. Absent.
Accordingly, since no current flows through the piezoelectric buzzer drive circuit 5, even if snow accumulates on the piezoelectric diaphragm of the piezoelectric buzzer 7 and short-circuits with the vehicle body, a weak short-circuit current does not flow, and the piezoelectric buzzer 7 can be prevented, and the occurrence of electrolytic corrosion can be avoided, leading to power saving of the on-vehicle power supply.

以上、本発明にかかる車載用警報装置について、後退時における警報装置として一例を挙げ、説明したが、車載用警報装置はこれに限らず、左折時における警報装置、その他、キャビンをチルトさせるときの警報装置等に適用できるのは勿論である。   As described above, the on-vehicle alarm device according to the present invention has been described as an example of the alarm device at the time of reversing. However, the on-vehicle alarm device is not limited to this, and the alarm device at the time of left turn, and other cases when the cabin is tilted. Of course, it can be applied to an alarm device or the like.

本発明にかかる車載用警報装置を搭載した車両の概略的側面図である。1 is a schematic side view of a vehicle equipped with an in-vehicle alarm device according to the present invention. 図１に示す車載用警報装置に用いられる圧電ブザーの一例を示す、外観図である。It is an external view which shows an example of the piezoelectric buzzer used for the vehicle-mounted alarm device shown in FIG. 本発明にかかる車載用警報装置の一つの実施態様を示す回路構成図である。It is a circuit block diagram which shows one embodiment of the vehicle-mounted alarm device concerning this invention.

符号の説明Explanation of symbols

１ 車両
２ 車体
３ 車載用警報装置
４ 電装品ボックス
５ 圧電ブザー駆動回路
６ ブラケット
７ 圧電ブザー
８ スイッチ回路
９ バックランプスイッチ
１０ 発振回路
ＣL コイル
ｄ1 ダイオード
ｒ1，ｒ2 抵抗
Ｔr1, Ｔr2 トランジスタ
DESCRIPTION OF SYMBOLS 1 Vehicle 2 Car body 3 In-vehicle alarm device 4 Electrical component box 5 Piezoelectric buzzer drive circuit 6 Bracket 7 Piezoelectric buzzer 8 Switch circuit 9 Back lamp switch 10 Oscillation circuit CL Coil d1 Diode r1, r2 Resistance Tr1, Tr2 Transistor

Claims (2)

車両適所に搭載して、車両の動作時に周囲に警報を発する圧電ブザーと、この圧電ブザーに駆動電圧を印加するための圧電ブザー駆動回路を備え、この圧電ブザー駆動回路は、スイッチ回路を介して車載用電源と接続し、このスイッチ回路は、車載用電源の＋端子側にＰＮＰトランジスタのエミッタ側を接続し、前記ＰＮＰトランジスタのベース側を第一のダイオード、抵抗を介して、一方の端子側を車体側へ接地した遮断スイッチの他方の端子側に接続して、前記第一のダイオードが、前記遮断スイッチの他方の端子側への整流作用を有するようにし、前記ＰＮＰトランジスタのコレクタ側を前記圧電ブザー駆動回路の＋端子側に接続すると共に、前記圧電ブザー駆動回路の−端子側を、第二のダイオードを介して前記遮断スイッチの他方の端子側に接続して、前記第二のダイオードが、前記遮断スイッチの他方の端子側への整流作用を有するようにし、前記圧電ブザーは駆動電圧が印加されたとき警報を発すると共に、車体側への接地から独立して前記圧電ブザー駆動回路と接続し、前記圧電ブザー駆動回路及び前記スイッチ回路がいずれも、前記遮断スイッチがオフの場合は車体側への接地から独立し、前記遮断スイッチがオンの場合は、前記圧電ブザー駆動回路の−端子側及び前記ＰＮＰトランジスタのベース側が前記遮断スイッチから車体側へ接地するように構成したことを特徴とする車載用警報装置。 A piezoelectric buzzer that is mounted at an appropriate position in the vehicle and issues a warning to the surroundings during operation of the vehicle, and a piezoelectric buzzer drive circuit for applying a drive voltage to the piezoelectric buzzer. The piezoelectric buzzer drive circuit is connected via a switch circuit. This switch circuit is connected to the in-vehicle power source, and the switch circuit has an emitter side of the PNP transistor connected to the + terminal side of the in-vehicle power source, and the base side of the PNP transistor is connected to one terminal side via a first diode and resistor. Is connected to the other terminal side of the cutoff switch grounded to the vehicle body side so that the first diode has a rectifying action to the other terminal side of the cutoff switch, and the collector side of the PNP transistor is while connected to the positive terminal side of the piezoelectric buzzer drive circuit, the piezoelectric buzzer drive circuit - the terminal side, the other of the blocking switch via a second diode Connected to the terminal side, the second diode, to have a rectification action to the other terminal side of the isolation switch, the piezoelectric buzzer with issues an alarm when a drive voltage is applied, to the vehicle body The piezoelectric buzzer driving circuit is connected to the piezoelectric buzzer driving circuit independently of the grounding of the vehicle, and both the piezoelectric buzzer driving circuit and the switch circuit are independent of the grounding to the vehicle body side when the cutoff switch is off, and the cutoff switch is on. In this case , the on-vehicle alarm device is configured such that the negative terminal side of the piezoelectric buzzer driving circuit and the base side of the PNP transistor are grounded from the cutoff switch to the vehicle body side. 前記遮断スイッチは、バックギヤへのシフト操作に連動して、圧電ブザー駆動回路へ車載用電源を印加する構成としたことを特徴とする請求項１に記載の車載用警報装置。 The in-vehicle alarm device according to claim 1, wherein the cutoff switch is configured to apply an in-vehicle power source to the piezoelectric buzzer driving circuit in conjunction with a shift operation to a back gear.
JP2004372313A 2004-12-22 2004-12-22 In-vehicle alarm device Active JP4493087B2 (en)

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JP7007785B2 (en) * 2017-10-31 2022-02-10 ダイハツ工業株式会社 Vehicle structure

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58104742U (en) * 1982-01-12 1983-07-16 市光工業株式会社 Vehicle reverse warning circuit
JPH0761284A (en) * 1993-08-25 1995-03-07 Hino Motors Ltd Alarm circuit for automobile

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58104742U (en) * 1982-01-12 1983-07-16 市光工業株式会社 Vehicle reverse warning circuit
JPH0761284A (en) * 1993-08-25 1995-03-07 Hino Motors Ltd Alarm circuit for automobile

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