US3879726A - Audible alarm unit - Google Patents

Audible alarm unit Download PDF

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Publication number
US3879726A
US3879726A US404453A US40445373A US3879726A US 3879726 A US3879726 A US 3879726A US 404453 A US404453 A US 404453A US 40445373 A US40445373 A US 40445373A US 3879726 A US3879726 A US 3879726A
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US
United States
Prior art keywords
alarm unit
cover
circuit board
printed circuit
compartments
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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 - Lifetime
Application number
US404453A
Inventor
Louis P Sweany
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.)
Duracell Inc USA
Yosemite Investments Inc
Original Assignee
PR Mallory and Co Inc
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Application filed by PR Mallory and Co Inc filed Critical PR Mallory and Co Inc
Priority to US404453A priority Critical patent/US3879726A/en
Priority to AR25595674A priority patent/AR203123A1/en
Application granted granted Critical
Publication of US3879726A publication Critical patent/US3879726A/en
Assigned to ARCOTRONICS INC. reassignment ARCOTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EMHART INDUSTRIES, INC.
Assigned to U.S. CAPACITORS INC., A CORP OF DE reassignment U.S. CAPACITORS INC., A CORP OF DE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). 5-15-90 DE Assignors: ARCOTRONICS INC., A CORP OF DE
Anticipated expiration legal-status Critical
Assigned to YOSEMITE INVESTMENTS, INC. reassignment YOSEMITE INVESTMENTS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: U.S. CAPACITORS INC.
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/42—Piezoelectric device making

Definitions

  • This invention relates to an audible alarm unit; and more particularly to a piezoelectric audible alarm unit which is contained in a low cost housing.
  • Piezoelectric transducers are being increasingly used in audible alarm units to produce audible signals from small electric currents.
  • the transducer includes a vibrating surface which vibrates in response to electrical currents and produces the audible signal.
  • the means supplying the electrical current is carried on a printed circuit board.
  • the transducer and the printed circuit board are carried in a suitable housing which because of strong competition in the industry should be made as low cost as possible while being neat and compact and still be able to protect the transducer and the printed circuit board from rough handling and abuse. Moreover, the number of parts to be handled in provid ing the housing with the working elements of the unit should be minimized.
  • Another object of the invention is to provide a low cost piezoelectric alarm unit including a piezoelectric transducer and a printed circuit board assembly having the electrical circuit necessary to energize the transducer, both of which are contained in a compact housing.
  • a further object of the invention is to provide a piezoelectric audible alarm unit the elements of which are contained in a housing which is relatively inexpensive, neat and compact but yet be able to protect the elements of the unit.
  • Yet still another object of the invention is to provide a piezoelectric audible alarm unit wherein a piezoelectric transducer is carried in one of two compartments of a housing with a printed circuit board assembly having an electrical circuit for energizing the transducer contained in another compartment of the housing.
  • FIG. 1 is a cross-section in elevation of the audible alarm unit
  • FIG/2 is a view looking at the outlet end of the unit.
  • FIG. 3 is a view looking at the other end of the unit.
  • an audible alarm unit which includes a housing including a cup-shaped member having open and closed ends, first and second storage compartments, and a cover closing the open end; shelf means separating the compartments; an aperture in the closed end; a piezoelectric transducer carried in one of the compartments and having a vibrating surface exposed to the aperture; a printed circuit board assembly carried by the shelf in the other of the compartments including an electrical circuit for energizing the piezoelectric transducer; electrical terminals extending from the printed circuit board assembly out through the cover; and alarm unit mounting means carried by the housing.
  • an audible alarm unit includes a piezoelectric transducer 12, an electrical circuit 14 energizing the piezoelectric transducer carried by a printed circuit board 16, the printed circuit board and the piezoelectric transducer being contained in a housing 18.
  • Piezoelectric transducer 12 includes a vibrating surface 20 and electrodes 22 which causes the vibrating surface to vibrate when electrical current is applied to the electrodes.
  • resistors 24, a transistor 26 and other electrical elements needed to energize the transducer in a predetermined manner A more complete description of an audible alarm unit employing a piezoelectric transducer and an electric circuit to energize the transducer is described in US. Pat. No. 3,277,465 which is incorporated herein by reference. Electrical leads 28 connect the transducer to the elements 14 supplying the current to the transducer.
  • Housing 18 includes a cup-shaped member 30 having open and closed ends 32 and 34 respectively and a cover 36 substantially closingthe open. end.
  • the housing may be fabricated from aluminum or soft steel, for example. As shown, the housing is divided into two storage compartments 38 and 40 with a shelf means 42 providing a means for separating the two.
  • the printed circuit board which with its electrical circuit 14 is carried in compartment 38 on shelf means 42, while the piezoelectric transducer 22 is carried in compartment 40.
  • An aperture 44 is provided in the closed end 34 of the cup-shaped member so that the vibrating surface 20 may be exposed to the surrounding area.
  • the transducer is carried on a rib 46 which substantially surrounds the aperture 44, the transducer being bonded to the rib through a suitable adhesive 48 such as resilient silicone rubber. Vibrating surface 20 is protected from damage through a grill 50.
  • Shelf means 42 includes a rib 52 provided by the taper resulting from the difference of diameters of the two compartments.
  • Cover 36 is maintained in fixed relation from printed circuit board 16 through a spacer means which includes a ring 5 4.
  • a pair of electrical terminals 58 extend from the printed circuit board out through the cover 36 so that electrical power may be supplied to the unit.
  • the alarm unit may be mounted on any suitable frame (not shown) by an alarm unit mounting means which in the present embodiment includes a ring 60 having a plurality of ears 62 extending therefrom.
  • An audible alarm unit comprising:
  • a housing including a cup-shaped member having open and closed ends, first and second storage compartments, and a cover closing said open end,
  • shelf means providing a means separating said compartments
  • a printed circuit board assembly carried by said shelf in the other of said compartments including an electrical circuit for energizing said piezoelectric transducer
  • alarm unit mounting means comprising a ring carried by said cover and a plurality of ears extending from said ring
  • spacer means carried by and disposed between said printed circuit board and said cover to maintain said printed circuit board and cover in spaced relation.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Alarm Systems (AREA)

Abstract

A piezoelectric transducer is carried in one of two compartments of a cup-shaped housing member with a printed circuit board assembly having an electrical circuit to energize the piezoelectric transducer carried in the other compartment.

Description

United States Patent 1191 Sweany Apr. 22, 1975 [5 AUDIBLE ALARM UNIT 3.331.970 7/1967 Dundon m 310/91 3.5 .654 3 197 H h 310 8.9 [75] lnvemo sweany, Carmel 3512 1.460 6/1978 W223 310/82 73 Assigneez p R Mallory & Cm Inc" 3.578.995 5/1971 Massa 3l0/8.8 Indianapolis Ind 3.638.052 1/1972 Massa 310/8.2 3.700.938 10/1972 Bryant.... 3l0/9.1 [22] Filed: Oct. 9, 1973 3.716.681 2/1973 Barrow 179/110 A [21] Appl. No.: 404,453
Primary Examiner-John W. Caldwell Related Apphcatlon Dam Assistant Exanziner-William M. Wannisky [63] Continuation of Scr. No. 236.307. March 20. 1972. Attorney, Agent or Fj Cha w H ff abandmcd' Robert F. Meyer; Donald W. Hanson [52] U.S. Cl 340/384 E; 310/9.1; 179/110 A;
174/5052; 174/52 R; 29/2535; 340/10 57 ST CT [51] Int. Cl. G08b 3/00 [58] Field of Search 340/384 E. 10; 310/8. 8.2, A piezoelectric transducer is carried in one of two 310/8]. 9.1. 9.2. 9.4, 8.5. 8.8; 179/110 A; compartments ofa cup-shaped housing member with a 220/21 R; 174/50, 50.52. 52 R, 52 S; printed circuit board assembly having an electrical cir- 29/25.35 cuit to energize the piezoelectric transducer carried in [56] References Cited the other compartment.
UNITED STATES PATENTS 7 Cl 3 D 2.967.957 1/1961 Massa 310/94 i gums AUDlIBlLE ALARM urvrr This is a continuation of application Ser. No. 236,307, filed Mar. 20, 1972, and now abandoned.
This invention relates to an audible alarm unit; and more particularly to a piezoelectric audible alarm unit which is contained in a low cost housing.
Piezoelectric transducers are being increasingly used in audible alarm units to produce audible signals from small electric currents. The transducer includes a vibrating surface which vibrates in response to electrical currents and produces the audible signal. Usually the means supplying the electrical current is carried on a printed circuit board. The transducer and the printed circuit board are carried in a suitable housing which because of strong competition in the industry should be made as low cost as possible while being neat and compact and still be able to protect the transducer and the printed circuit board from rough handling and abuse. Moreover, the number of parts to be handled in provid ing the housing with the working elements of the unit should be minimized.
It is therefore an object of the present invention to provide a low cost piezoelectric audible alarm unit.
Another object of the invention is to provide a low cost piezoelectric alarm unit including a piezoelectric transducer and a printed circuit board assembly having the electrical circuit necessary to energize the transducer, both of which are contained in a compact housing.
A further object of the invention is to provide a piezoelectric audible alarm unit the elements of which are contained in a housing which is relatively inexpensive, neat and compact but yet be able to protect the elements of the unit.
Yet still another object of the invention is to provide a piezoelectric audible alarm unit wherein a piezoelectric transducer is carried in one of two compartments of a housing with a printed circuit board assembly having an electrical circuit for energizing the transducer contained in another compartment of the housing.
These and other objects of the invention will be apparent from the following description taken in conjunction with the accompanying drawings wherein:
FIG. 1 is a cross-section in elevation of the audible alarm unit;
FIG/2 is a view looking at the outlet end of the unit; and
FIG. 3 is a view looking at the other end of the unit.
Generally speaking, the objects of the invention are accomplished by providing an audible alarm unit which includes a housing including a cup-shaped member having open and closed ends, first and second storage compartments, and a cover closing the open end; shelf means separating the compartments; an aperture in the closed end; a piezoelectric transducer carried in one of the compartments and having a vibrating surface exposed to the aperture; a printed circuit board assembly carried by the shelf in the other of the compartments including an electrical circuit for energizing the piezoelectric transducer; electrical terminals extending from the printed circuit board assembly out through the cover; and alarm unit mounting means carried by the housing.
Referring now to the drawings, an audible alarm unit includes a piezoelectric transducer 12, an electrical circuit 14 energizing the piezoelectric transducer carried by a printed circuit board 16, the printed circuit board and the piezoelectric transducer being contained in a housing 18.
Piezoelectric transducer 12 includes a vibrating surface 20 and electrodes 22 which causes the vibrating surface to vibrate when electrical current is applied to the electrodes. The electrical circuit 14 carried by the printed circuit board 16, and which is used to supply electrical energy tothe transducer, includes a variety of resistors 24, a transistor 26 and other electrical elements needed to energize the transducer in a predetermined manner. A more complete description of an audible alarm unit employing a piezoelectric transducer and an electric circuit to energize the transducer is described in US. Pat. No. 3,277,465 which is incorporated herein by reference. Electrical leads 28 connect the transducer to the elements 14 supplying the current to the transducer.
Housing 18 includes a cup-shaped member 30 having open and closed ends 32 and 34 respectively and a cover 36 substantially closingthe open. end. The housing may be fabricated from aluminum or soft steel, for example. As shown, the housing is divided into two storage compartments 38 and 40 with a shelf means 42 providing a means for separating the two. The printed circuit board which with its electrical circuit 14 is carried in compartment 38 on shelf means 42, while the piezoelectric transducer 22 is carried in compartment 40. An aperture 44 is provided in the closed end 34 of the cup-shaped member so that the vibrating surface 20 may be exposed to the surrounding area. The transducer is carried on a rib 46 which substantially surrounds the aperture 44, the transducer being bonded to the rib through a suitable adhesive 48 such as resilient silicone rubber. Vibrating surface 20 is protected from damage through a grill 50.
Shelf means 42 includes a rib 52 provided by the taper resulting from the difference of diameters of the two compartments. Cover 36 is maintained in fixed relation from printed circuit board 16 through a spacer means which includes a ring 5 4. A pair of electrical terminals 58 extend from the printed circuit board out through the cover 36 so that electrical power may be supplied to the unit. The alarm unit may be mounted on any suitable frame (not shown) by an alarm unit mounting means which in the present embodiment includes a ring 60 having a plurality of ears 62 extending therefrom.
What is claimed is:
1. An audible alarm unit comprising:
a. a housing including a cup-shaped member having open and closed ends, first and second storage compartments, and a cover closing said open end,
b. shelf means providing a means separating said compartments,
c. an aperture in said closed end providing an opening to one of said compartments, and a rib surrounding said aperture,
d. a piezoelectric transducer bonded to said rib and having a vibrating surface exposed to said aperture,
e. a printed circuit board assembly carried by said shelf in the other of said compartments including an electrical circuit for energizing said piezoelectric transducer,
f. electrical terminals extending from said printed circuit board assembly out through said cover,
g. alarm unit mounting means comprising a ring carried by said cover and a plurality of ears extending from said ring, and
h. spacer means carried by and disposed between said printed circuit board and said cover to maintain said printed circuit board and cover in spaced relation.
2. An audible alarm unit according to claim 1 wherein said shelf means includes a rib extending around the inner periphery of said cup-shaped member.
3. An audible alarm unit according to claim 2 wherein said first and second compartments are of different diameters and said rib is provided by a taper bewherein said-cup-shaped member is aluminum.

Claims (7)

1. An audible alarm unit comprising: a. a housing including a cup-shaped member having open and closed ends, first and second storage compartments, and a cover closing said open end, b. shelf means providing a means separating said compartments, c. an aperture in said closed end providing an opening to one of said compartments, and a rib surrounding said aperture, d. a piezoelectric transducer bonded to said rib and having a vibrating surface exposed to said aperture, e. a printed circuit board assembly carried by said shelf in the other of said compartments including an electrical circuit for energizing said piezoelectric transducer, f. electrical terminals extending from said printed circuit board assembly out through said cover, g. alarm unit mounting means comprising a ring carried by said cover and a plurality of ears extending from said ring, and h. spacer means carried by and disposed between said printed circuit board and said cover to maintain said printed circuit board and cover in spaced relation.
1. An audible alarm unit comprising: a. a housing including a cup-shaped member having open and closed ends, first and second storage compartments, and a cover closing said open end, b. shelf means providing a means separating said compartments, c. an aperture in said closed end providing an opening to one of said compartments, and a rib surrounding said aperture, d. a piezoelectric transducer bonded to said rib and having a vibrating surface exposed to said aperture, e. a printed circuit board assembly carried by said shelf in the other of said compartments including an electrical circuit for energizing said piezoelectric transducer, f. electrical terminals extending from said printed circuit board assembly out through said cover, g. alarm unit mounting means comprising a ring carried by said cover and a plurality of ears extending from said ring, and h. spacer means carried by and disposed between said printed circuit board and said cover to maintain said printed circuit board and cover in spaced relation.
2. An audible alarm unit according to claim 1 wherein said shelf means includes a rib extending around the inner periphery of said cup-shaped member.
3. An audible alarm unit according to claim 2 wherein said first and second compartments are of different diameters and said rib is provided by a taper between said compartments.
4. An audible alarm unit according to claim 1 further comprising a protective grill extending across said aperture to protect said vibrating surface.
5. An audible alarm unit according to claim 1 wherein said spacer means comprises a ring disposed about an inner periphery of said cup-shaped member and disposed between said cover and said printed circuit board.
6. An audible alarm unit according to claim 1 wherein said cup-shaped member is soft steel.
US404453A 1972-03-20 1973-10-09 Audible alarm unit Expired - Lifetime US3879726A (en)

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AR25595674A AR203123A1 (en) 1973-10-09 1974-10-07 LOCALLY DEFORMABLE PLASTIC CLOSURE CONSTRUCTED CONTRACTABLY AND DISTENDIBLY AND THAT HAS AN ELASTICITY THAT CAN TIGHTLY CLOSE AN OPEN MOUTH ELEMENT

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US23630772A 1972-03-20 1972-03-20
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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4013992A (en) * 1976-01-28 1977-03-22 The United States Of America As Represented By The Secretary Of The Navy Diver's piezoelectric microphone with integral agc preamplifier
FR2361709A1 (en) * 1976-08-11 1978-03-10 Ward Goldstone Ltd ACOUSTIC GENERATOR
US4131874A (en) * 1977-05-12 1978-12-26 Westinghouse Electric Corp. Inertial balanced dipole hydrophone
US4191904A (en) * 1978-09-28 1980-03-04 Fred M. Dellorfano, Jr. Electroacoustic transducers of the flexural resonant vibratile type
US4197697A (en) * 1975-12-02 1980-04-15 Kabushiki Kaisha Daini Seikosha Alarm watch
US4230383A (en) * 1978-11-09 1980-10-28 Pittway Corporation Integral contact
US4273399A (en) * 1979-11-05 1981-06-16 Amp Incorporated Transducer supporting and contacting means
US4278851A (en) * 1978-09-07 1981-07-14 Murata Manufacturing Co., Ltd. Piezoelectric buzzer
US4282520A (en) * 1978-10-25 1981-08-04 Shipp John I Piezoelectric horn and a smoke detector containing same
US4306229A (en) * 1976-03-17 1981-12-15 Nohmi Bosai Kogyo Co., Ltd. Smoke detector having an integral piezo-electric buzzer
US4325060A (en) * 1979-12-17 1982-04-13 Purtell Jack L Floating water detector
US4328485A (en) * 1980-02-25 1982-05-04 Potter Bronson M Binary alarm
US4579464A (en) * 1983-08-09 1986-04-01 Terumo Kabushiki Kaisha Electronic clinical thermometer
US4674161A (en) * 1984-04-11 1987-06-23 Siemens Aktiengesellschaft Connection method for piezo-electric acoustic transducers in electro-acoustic capsules
US4945346A (en) * 1989-08-07 1990-07-31 Schmiemann John P Audible circuit tracer
US5118981A (en) * 1988-09-09 1992-06-02 Nissan Motor Company, Limited Piezoelectric sensor for monitoring kinetic momentum
US5398024A (en) * 1992-08-04 1995-03-14 Knowles; Todd Signal annunciators
US5789703A (en) * 1995-10-13 1998-08-04 Samsung Electro-Mechanics Co., Ltd. Device for coupling focus unit of fly back transformer
WO1999053475A1 (en) * 1998-04-14 1999-10-21 Trw Automotive Electronics & Components Gmbh & Co. Kg Contact element for an ultrasound sensor
US6130618A (en) * 1998-01-15 2000-10-10 Yosemite Investment, Inc. Piezoelectric transducer assembly adapted for enhanced functionality

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967957A (en) * 1957-09-17 1961-01-10 Massa Frank Electroacoustic transducer
US3331970A (en) * 1964-09-29 1967-07-18 Honeywell Inc Sonic transducer
US3501654A (en) * 1967-06-12 1970-03-17 Corning Glass Works Miniature pressure transducer
US3518460A (en) * 1968-10-30 1970-06-30 Euphonics Corp Ultrasonic transducer employing suspended piezoelectric plate
US3578995A (en) * 1969-09-22 1971-05-18 Dynamics Corp Massa Div Electroacoustic transducers of the bilaminar flexural vibrating type
US3638052A (en) * 1969-09-22 1972-01-25 Dynamics Corp America Electroacoustic transducers of the bilaminar flexural vibrating type
US3700938A (en) * 1971-12-15 1972-10-24 Bell Telephone Labor Inc Electroacoustic transducer with magnetic transducing element clamping
US3716681A (en) * 1970-10-19 1973-02-13 Dynamics Corp Massa Div Piezolectric transducer having spider-like frame structure

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967957A (en) * 1957-09-17 1961-01-10 Massa Frank Electroacoustic transducer
US3331970A (en) * 1964-09-29 1967-07-18 Honeywell Inc Sonic transducer
US3501654A (en) * 1967-06-12 1970-03-17 Corning Glass Works Miniature pressure transducer
US3518460A (en) * 1968-10-30 1970-06-30 Euphonics Corp Ultrasonic transducer employing suspended piezoelectric plate
US3578995A (en) * 1969-09-22 1971-05-18 Dynamics Corp Massa Div Electroacoustic transducers of the bilaminar flexural vibrating type
US3638052A (en) * 1969-09-22 1972-01-25 Dynamics Corp America Electroacoustic transducers of the bilaminar flexural vibrating type
US3716681A (en) * 1970-10-19 1973-02-13 Dynamics Corp Massa Div Piezolectric transducer having spider-like frame structure
US3700938A (en) * 1971-12-15 1972-10-24 Bell Telephone Labor Inc Electroacoustic transducer with magnetic transducing element clamping

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4197697A (en) * 1975-12-02 1980-04-15 Kabushiki Kaisha Daini Seikosha Alarm watch
US4013992A (en) * 1976-01-28 1977-03-22 The United States Of America As Represented By The Secretary Of The Navy Diver's piezoelectric microphone with integral agc preamplifier
US4306229A (en) * 1976-03-17 1981-12-15 Nohmi Bosai Kogyo Co., Ltd. Smoke detector having an integral piezo-electric buzzer
US4195284A (en) * 1976-08-11 1980-03-25 Ward & Goldstone Limited Sound generator
FR2361709A1 (en) * 1976-08-11 1978-03-10 Ward Goldstone Ltd ACOUSTIC GENERATOR
US4131874A (en) * 1977-05-12 1978-12-26 Westinghouse Electric Corp. Inertial balanced dipole hydrophone
US4278851A (en) * 1978-09-07 1981-07-14 Murata Manufacturing Co., Ltd. Piezoelectric buzzer
US4191904A (en) * 1978-09-28 1980-03-04 Fred M. Dellorfano, Jr. Electroacoustic transducers of the flexural resonant vibratile type
US4282520A (en) * 1978-10-25 1981-08-04 Shipp John I Piezoelectric horn and a smoke detector containing same
US4230383A (en) * 1978-11-09 1980-10-28 Pittway Corporation Integral contact
US4273399A (en) * 1979-11-05 1981-06-16 Amp Incorporated Transducer supporting and contacting means
US4325060A (en) * 1979-12-17 1982-04-13 Purtell Jack L Floating water detector
US4328485A (en) * 1980-02-25 1982-05-04 Potter Bronson M Binary alarm
US4579464A (en) * 1983-08-09 1986-04-01 Terumo Kabushiki Kaisha Electronic clinical thermometer
US4674161A (en) * 1984-04-11 1987-06-23 Siemens Aktiengesellschaft Connection method for piezo-electric acoustic transducers in electro-acoustic capsules
US5118981A (en) * 1988-09-09 1992-06-02 Nissan Motor Company, Limited Piezoelectric sensor for monitoring kinetic momentum
US4945346A (en) * 1989-08-07 1990-07-31 Schmiemann John P Audible circuit tracer
US5398024A (en) * 1992-08-04 1995-03-14 Knowles; Todd Signal annunciators
US5789703A (en) * 1995-10-13 1998-08-04 Samsung Electro-Mechanics Co., Ltd. Device for coupling focus unit of fly back transformer
US6130618A (en) * 1998-01-15 2000-10-10 Yosemite Investment, Inc. Piezoelectric transducer assembly adapted for enhanced functionality
US6414604B1 (en) * 1998-01-15 2002-07-02 Yosemite Investment Inc Piezoelectric transducer assembly adapted for enhanced functionality
WO1999053475A1 (en) * 1998-04-14 1999-10-21 Trw Automotive Electronics & Components Gmbh & Co. Kg Contact element for an ultrasound sensor
US6520019B1 (en) 1998-04-14 2003-02-18 Trw Automotive Electronics & Components Gmbh & Co. Kg Ultrasound sensor

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