EP0119277B1 - Nachhallende Schallerzeuger - Google Patents

Nachhallende Schallerzeuger Download PDF

Info

Publication number
EP0119277B1
EP0119277B1 EP19830100643 EP83100643A EP0119277B1 EP 0119277 B1 EP0119277 B1 EP 0119277B1 EP 19830100643 EP19830100643 EP 19830100643 EP 83100643 A EP83100643 A EP 83100643A EP 0119277 B1 EP0119277 B1 EP 0119277B1
Authority
EP
European Patent Office
Prior art keywords
sound generator
sound
connection
reverberation
capacitor
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
Application number
EP19830100643
Other languages
English (en)
French (fr)
Other versions
EP0119277A1 (de
Inventor
Muneki Yoshino
Toshitaka Tanahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
NipponDenso Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
Priority to EP19830100643 priority Critical patent/EP0119277B1/de
Priority to DE8383100643T priority patent/DE3375339D1/de
Publication of EP0119277A1 publication Critical patent/EP0119277A1/de
Application granted granted Critical
Publication of EP0119277B1 publication Critical patent/EP0119277B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
    • B06B2201/50—Application to a particular transducer type
    • B06B2201/55—Piezoelectric transducer

Definitions

  • the present invention relates to a reverberation sound generator for use as a warning generator for giving a warning to the driver of an automobile, for example, or particularly as a speed warning generator which can be actuated when the car speed exceeds a preset value.
  • Speed warning generators to which the present invention is directed give a warning to the driver of a car when the car speed becomes higher than a predetermined speed, such as 100 Km/hour.
  • the speed alarm generator utilizes contacts in speedometer and is engergizable when the car speed as indicated by the speedometer exceeds a preset warning speed.
  • the warning means in such a speed warning generator is generally required to meet the following requirements: First, it should be constructed simply and inexpensively. Second, A sound pressure great enough to transmit a warning reliably to the driver should be ensured. The third requirement is that the warning means should be of high safety for issuing a warning sound with a good tone color so as not to disturb the driver's activities while driving the car.
  • conventional warning generators are ganged with a speedometer for detecting a car speed higher than 100 Km/hour, for example, to turn intermittently on and off the contacts for producing a warning while the car speed is exceeding the preset level.
  • the speed warning generator incorporates a mechanical chime mechanism including a plunger mechanism energizable when the contacts are closed for striking a first vibrator plate and a spring mechanism attached to the plunger mechanism and actuatable when the contacts are opened to produce a reactive force for hitting a second vibrator plate.
  • the prior speed warning generator has employed a chime mechanism as the warning means for producing intermittent sounds.
  • Such a mechanical chime is simple and inexpensive in construction, can produce a warning of sufficiently good tone color, and hence is used effectively.
  • the mechanical chime has failed to produce sounds of a sufficient sound pressure. It has been disadvantageous in that it is subjected to limitations on the location of its installation, its orientation, and the like.
  • One way to eliminate the above difficulties with the chime mechanism would be to provide means for increasing the sound pressure, and such means would be larger vibrator plates and increase the attractive force of the plunger mechanism with which to hit the vibrator plates, that is, increase the ampere turn of the coil of the plunger. This proposal however would be limited by its size and power consumption.
  • Another means for overcoming the insufficient sound pressure in the mechanical chime would be to use an electromagnetic buzzer. The electromagnetic buzzer with contacts however would be unstable in tone color because of rattles due to vibrations of the car, sound changes, and other causes.
  • Contactless buzzers would generally emit sounds of high fundamentals since the diameter of a vibrator plate could not be increased due to the size limitation. Although the contactless buzzer would be able to ensure a sufficient sound pressure, it would give the driver discomfort and hence tend to interfere with the driver's driving activities.
  • a further object is to provide a reverberation sound generator that can be used effectively as a general warning device, for example.
  • the capacitor When the sound generation command switch is closed and opened, the capacitor is charged and discharged, respectively, to cause a decreasing current to flow through one of the diodes at a time for energizing the sound generator circuit to emit reverberation sounds.
  • a DC power supply 11 such as a storage battery on an automobile supplies an electric power via an ignition switch 12 to a reverberation sound generator 13.
  • the reverberation sound generator 13 has a capacitor 14 chargeable by a current supplied from the DC power supply 11 through the ignition switch 12.
  • To the capacitor 14 are connected a pair of first and second diodes 15, 16 which are coupled together through a pair of first and second resistors 17, 18 respectively, which are connected at d. Therefore, the diodes 15, 16 and the resistors 17, 18 jointly constitute a bridge circuit.
  • the diodes 15, 16 and the resistors 17, 18 are coupled at junctions a, b, respectively, between which a sound generator circuit 19 is connected.
  • the capacitor 14 and the bridge circuit to which the sound generator circuit 19 is connected are joined in series with each other.
  • the diodes 15,16 are connected at c in opposite polarity to each other such that they will be forward-biased respectively by charging and discharging currents for the capacitor 14.
  • the bridge circuit is grounded via a sound generating command switch 20.
  • the switch is controlled to open and close its contacts at a predetermined frequency such as 1 Hz in response to an electric signal issued from a speed sensor mechanism (not shown) in response to detection thereby of a car speed of 100 Km/hour, for example, or higher.
  • a discharge resistor 21 is connected in parallel to the series connection of the capacitor 14 and the bridge circuit.
  • Fig. 2 shows in detail the sound generator circuit 19 connected between the junctions a, b of the bridge circuit.
  • the sound generator circuit 19 comprises a driver transistor 22 of the NPN type having a collector and an emitter connected respectively to the junctions a, b.
  • a piezoelectric element 23 has a feedback terminal that can be driven by the transistor 22.
  • a resistor 24 is connected to the base of the transistor 22.
  • a self- biasing resistor 25 is connected between the resistor 24 and the collector of the transistor 22.
  • the sound generator circuit 19 thus constitutes a self-excited piezoelectric buzzer.
  • the reverberation sound generator of the foregoing construction will operate as follows: When the car speed exceeds a preset speed level, the switch 20 turns on and off repeatedly in response to an electric signal issued by the speed sensor mechanism (not shown). With the switch 20 closed, a current path is completed from the power supply 11 through the ignition switch 12 which is closed while the car is running, the capacitor 14, the diode 15, the sound generator circuit 19, the resistor 18, and the switch 20 to ground. A divided current also flows through the resistor 17. Therefore, the capacitor 14 is progressively charged dependent on its electrostatic capacity and a time constant determined by the resistance of the resistors 17, 18, and the impedance of the sound generator circuit 19.
  • the voltage applied between the junctions a, b across the sound generator circuit 19 is gradually reduced after the switch 20 has been closed, causing the piezoelectric element 23 serving as a sound generator to produce a decreasing sound, or a sound with reverberation.
  • the capacitor 14 is completely charged, no more DC voltage is applied, and the sound generator circuit 19 stops producing sounds.
  • the capacitor 14 starts being discharged through the resistors 21, 17, the sound generator circuit 19, the diode 16, and the resistor 18.
  • the discharging of the capacitor 14 is dependent on a time constant determined by the resistors 21, 17 and the impedance of the sound generator circuit 19.
  • the voltage between the junctions a, b is gradually reduced to allow the sound generator circuit 19 to produce a sound with reverberation.
  • two distinct reverberation sounds are produced when the switch 20 is closed and opened in one cycle.
  • the discharging current from the capacitor 14 flows through the resistor 21, it is smaller as compared with the charging current, rendering the reverberation sound pressures different from each other when the switch 20 is closed and opened.
  • the reverberation sounds repeatedly produced have a clear accent in each cycle, so that the overall warning sound is effective and comfortable.
  • the reverberation sound generator is simple in construction since reverberation sounds can be produced when a capacitor is charged and discharged in response to closing and opening of a switch. A warning sound thus produced by the reverberation sound generator is quite pleasing to the ear. Since the sound generator circuit has a piezoelectric element drivable by self excitation, it can ensure a required amount of sound pressure. The reverberation sound generator is therefore highly effective for use as a speed warning generator for automobiles, for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Alarm Devices (AREA)

Claims (5)

1. Nachhallender Schallerzeuger mit einer Brücke aus einem Paar von ersten und zweiten Dioden (15,16) und einem Paar von ersten und zweiten Widerständen (17,18)
einem Kondensator (14), der auf einer Seite an einer ersten Klemme eines DC-Netzteils (11) und auf der anderen Seite an diese Brücke an der Verbindungsstelle (c) zwischen der Anode der ersten Diode (15) und der Kathode der zweiten Diode (16) in Reihe geschaltet ist,
einem Schallerzeuger-Schaltkreis (19) mit zwei Anschlußklemmen, von denen eine mit einer Verbindungsstelle (a) zwischen Kathode der ersten Diode (15) und dem ersten Widerstand (17) und die andere mit einer Verbindungsstelle (b) zwischen der Anode der zweiten Diode (16) und dem zweiten Widerstand (18) verbunden ist, wobei der Schallerzeuger-Schaltkreis (19) zur Erzeugung eines Schalls entsprechend der Differenz zwischen den Potentialen an seinen Anschlußklemmen erregbar ist,
einem Schallerzeugungsbefehlschalter (20), der auf einer Seite mit der zweiten Klemme des DC-Netzteils (11) und auf der anderen Seite mit der Brücke an der Verbindungsstelle (d) zwischen erstem und zweitem Widerstand (17,18) in Reihe geschaltet, ist,
wobei der Kondensator (14) von dem DC-Netzteil (11) über die Brücke in Abhängigkeit vom Schließen des Schallerzeugungsbefehlsschalters (20) aufgeladen wird, und
mit einem Entladekreis (21), der auf einer Seite an die Verbindung zwischen der Verbindungsstelle (d) zwischen erstem und zweitem Widerstand (17,18) und dem Schallerzeugungsbefehlsschalter (20) und auf der anderen Seite an die Verbindung zwischen der ersten Klemme des DC-Netzteils (11) und dem Kondensator (14) angeschlossen ist.
2. Nachhallender Schallerzeuger nach Anspruch 1, bei dem der Entladekreis ein Winderstand (21) ist.
3. Nachhallender Schallerzeuger nach Anspruch 1 oder 2, bei dem der Schallerzeugerschaltkreis (19) einen Treibertransistor (22) vom NPN-Typ und ein piezoelektrisches Element (23) mit einer Rückkopplungsklemme umfaßt, die durch den Transistor (22) antreibbar ist.
4. Nachhallender Schallerzeuger nach Anspruch 1 oder 2, bei dem der Schallerzeugungsbefehlschalter (20), gesteuert wird, um intermittierend bei einer verbestimmten Frequenz zu öffnen und zu schließen.
5. Verwendung eines nachhallenden Schallerzeugers nach Anspruch 4 in einem Kraftfahrzeug.
EP19830100643 1983-01-25 1983-01-25 Nachhallende Schallerzeuger Expired EP0119277B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19830100643 EP0119277B1 (de) 1983-01-25 1983-01-25 Nachhallende Schallerzeuger
DE8383100643T DE3375339D1 (en) 1983-01-25 1983-01-25 Reverberation sound generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19830100643 EP0119277B1 (de) 1983-01-25 1983-01-25 Nachhallende Schallerzeuger

Publications (2)

Publication Number Publication Date
EP0119277A1 EP0119277A1 (de) 1984-09-26
EP0119277B1 true EP0119277B1 (de) 1988-01-13

Family

ID=8190257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830100643 Expired EP0119277B1 (de) 1983-01-25 1983-01-25 Nachhallende Schallerzeuger

Country Status (2)

Country Link
EP (1) EP0119277B1 (de)
DE (1) DE3375339D1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR759578A (fr) * 1932-11-07 1934-02-05 Procédé pour la production de sons brefs puissants
DE2010016A1 (de) * 1969-03-04 1970-09-10 Negri, Vincenzo, Viadana, Mantova (Italien) Elektronischer, akustischer Anzeiger
US4213121C1 (en) * 1978-06-08 2002-05-14 Emhardt Ind Chime tone audio system utilizing a piezoelectric transducer

Also Published As

Publication number Publication date
DE3375339D1 (en) 1988-02-18
EP0119277A1 (de) 1984-09-26

Similar Documents

Publication Publication Date Title
US4122437A (en) Intrusion alarm control system
US5479152A (en) Portable refrigeration door open alarm apparatus
MXPA02003875A (es) Dispositivo de accionamiento con consumo reducido de energia.
US4594573A (en) Reverberation sound generator
CA2084205A1 (en) Vehicle Horn with Electronic Solid State Energizing Circuit
CN209955973U (zh) 一种用于车辆的方向盘振动提示系统
US6756892B2 (en) Tire pressure sensing system
US4170769A (en) Audio-detector alarm
EP0119277B1 (de) Nachhallende Schallerzeuger
WO1994026555A1 (en) Multi-sound vehicle horn system
US5398024A (en) Signal annunciators
US4792789A (en) Alarm driving signal generator
JPH0114080Y2 (de)
US4215339A (en) Electronic chime
JPH10291438A (ja) 車両用の可変ラウドネスホーン装置及びその制御方法
GB2220512A (en) Parking sensor
US5160913A (en) Electric horn with solid state driver
CN2263815Y (zh) 多功能电子式电喇叭
JPH0233278Y2 (de)
JPH09265594A (ja) 警報音響装置
JPS6344874Y2 (de)
GB2098763A (en) Electronic timepiece
JP2668069B2 (ja) 駐車禁止警告装置
JPH08207660A (ja) 車載用警報ブザーの駆動回路
CA1136245A (en) Timed audible alarm system utilizing a piezoelectric transducer

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19840413

AK Designated contracting states

Designated state(s): DE FR GB

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 3375339

Country of ref document: DE

Date of ref document: 19880218

ET Fr: translation filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: 746

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: FR

Ref legal event code: DL

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19990111

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19990128

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19990201

Year of fee payment: 17

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000125

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20000125

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000929

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001101

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST