JPH02226997A - Piezoelectric buzzer and its manufacture - Google Patents

Piezoelectric buzzer and its manufacture

Info

Publication number
JPH02226997A
JPH02226997A JP1048784A JP4878489A JPH02226997A JP H02226997 A JPH02226997 A JP H02226997A JP 1048784 A JP1048784 A JP 1048784A JP 4878489 A JP4878489 A JP 4878489A JP H02226997 A JPH02226997 A JP H02226997A
Authority
JP
Japan
Prior art keywords
piezoelectric
piezoelectric vibrator
container
wall
buzzer
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.)
Pending
Application number
JP1048784A
Other languages
Japanese (ja)
Inventor
Mutsuaki Hirota
睦明 廣田
Yukie Akaida
赤井田　幸英
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.)
Kyocera Corp
Original Assignee
Kyocera Corp
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 Kyocera Corp filed Critical Kyocera Corp
Priority to JP1048784A priority Critical patent/JPH02226997A/en
Publication of JPH02226997A publication Critical patent/JPH02226997A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/567—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using a tamping or a swaging operation, i.e. at least partially deforming the edge or the rim of a first part to be joined to clamp a second part to be joined
    • B29C65/568—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using a tamping or a swaging operation, i.e. at least partially deforming the edge or the rim of a first part to be joined to clamp a second part to be joined using a swaging operation, i.e. totally deforming the edge or the rim of a first part to be joined to clamp a second part to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/116—Single bevelled joints, i.e. one of the parts to be joined being bevelled in the joint area
    • B29C66/1162—Single bevel to bevel joints, e.g. mitre joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/135—Single hemmed joints, i.e. one of the parts to be joined being hemmed in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
    • B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5344—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/541—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles a substantially flat extra element being placed between and clamped by the joined hollow-preforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/61—Joining from or joining on the inside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3481—Housings or casings incorporating or embedding electric or electronic elements

Abstract

PURPOSE:To reduce the number of components and to simplify the assembly process by placing an end of a piezoelectric vibrator to a step formed to an inner wall of a package having a recessed part and fixing a part of the inner wall of the package with an inserted part molten by ultrasonic wave vibration. CONSTITUTION:A piezoelectric vibrator 2 is placed to a step 12 of an inner wall 11 of a package 1, a projection 16 is molten by ultrasonic wave vibration to weld the piezoelectric vibrator 2. A horn 24 is formed as a ring so as t be abutted only on the step 12 formed with the projection to be molten, for example, in response to the step 12 of the package 1. A cushion member 25 is formed to a recessed part 26 of the ultrasonic wave welder 20. Then in the case of ultrasonic wave welding, the resonance of a piezoelectric ceramic 22 caused through induction of the ultrasonic wave vibration propagated from the end of the piezoelectric vibrator 2 is absorbed. Thus, the piezoelectric vibrator 2 is fixed strongly and production of cracks or chipping to the piezoelectric ceramic 22 is prevented in advance.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は圧電振動子を容器収納した圧電ブザー及びその
製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a piezoelectric buzzer in which a piezoelectric vibrator is housed in a container, and a method for manufacturing the same.

〔従来の技術〕[Conventional technology]

従来の圧電ブザーの構成を第３図を用いて説明する。 The configuration of a conventional piezoelectric buzzer will be explained using FIG. 3.

従来の圧電ブザー３０は、圧電振動子３１と、樹脂製容
器３２とから成っている。A conventional piezoelectric buzzer 30 includes a piezoelectric vibrator 31 and a resin container 32.

圧電振動子３１は、円形の金属振動板３３に圧電磁器３
４を取着されている。The piezoelectric vibrator 31 includes a piezoelectric ceramic 3 mounted on a circular metal diaphragm 33.
4 has been attached.

樹脂製容器３２は凹部３５を有し、放音側には放音穴３
６が形成され、内壁部３７には連続又は断続的に段差部
３８が形成されている。The resin container 32 has a recess 35 and a sound emitting hole 3 on the sound emitting side.
6 is formed, and step portions 38 are formed continuously or intermittently on the inner wall portion 37.

圧電振動子３１の固定方法としては、前記段差部３８に
シリコーン樹脂などの接着剤３９を介して圧電振動子３
１が載置され、さらに上部より接着剤３９で充填されて
いる。As a method of fixing the piezoelectric vibrator 31, the piezoelectric vibrator 31 is attached to the stepped portion 38 via an adhesive 39 such as silicone resin.
1 is placed thereon, and is further filled with adhesive 39 from above.

しかしながら、上述の圧電ブザー３０の量産性に鑑みる
と、シリコーン樹脂などの接着剤３９を硬化させるため
には、熱処理工程や充分な乾燥時閏が必要となってしま
う。However, in view of the mass production of the piezoelectric buzzer 30 described above, a heat treatment process and a sufficient drying time are required to harden the adhesive 39 such as silicone resin.

また、別の従来の圧電ブザー４０は、第４図に示すよう
に、圧電振動子４１と、樹脂製容器４２と、裏ＩＥ４３
とから成っている。Further, as shown in FIG. 4, another conventional piezoelectric buzzer 40 includes a piezoelectric vibrator 41, a resin container 42, and a back IE 43.
It consists of.

この圧電ブザー４０の圧電振動子４１の固定方法として
は、容５４２に裏蓋４３を装着する際に、圧電振動子４
１を挟持固定するものであった。具体的には、図のよう
に、容器４２の開口部４４の径を段差部４５の径よりも
小なるように設定し、また裏蓋４３の端部を開口部４４
及び段差部４５の径に対応するように傾斜部が形成され
、この段差部４５にまで到達するように裏ＩＥ４３を圧
入するものであった。As a method of fixing the piezoelectric vibrator 41 of this piezoelectric buzzer 40, when attaching the back cover 43 to the case 542, the piezoelectric vibrator 41 is
1 was clamped and fixed. Specifically, as shown in the figure, the diameter of the opening 44 of the container 42 is set to be smaller than the diameter of the stepped portion 45, and the end of the back cover 43 is set to be smaller than the diameter of the stepped portion 45.
A sloped portion was formed to correspond to the diameter of the stepped portion 45, and the back IE 43 was press-fitted so as to reach the stepped portion 45.

しかしながら、上述の従来の圧電ブザー４０では、圧電
振動子４１を固定するのに裏ＢＥ４３が必要となり、部
品点数が増加してしまう。However, in the conventional piezoelectric buzzer 40 described above, the back BE 43 is required to fix the piezoelectric vibrator 41, which increases the number of parts.

また、第４図に示す圧電ブザーの変形として第５図に示
すように、圧電振動子５１を樹脂製容器５２と、リング
状の裏蓋５３とで挟持していた。Further, as a modification of the piezoelectric buzzer shown in FIG. 4, as shown in FIG. 5, a piezoelectric vibrator 51 is sandwiched between a resin container 52 and a ring-shaped back cover 53.

具体的な固定方法としては、樹脂製容ゐ５２の段差部５
５に圧電振動子５１を載置して、さらに圧電振動子５．
１及び樹脂製容器５２を覆うようにリング状の裏蓋５３
を装着した後、超音波振動により、リング状の裏蓋５３
又は樹脂製容器５２の溶着代５６を溶融してリング状の
裏蓋５３及び樹脂製容器５２と接合すると同時に圧電振
動子５１の固定を行うものであった（実開昭６３−１７
９１１７号公報）。As a specific fixing method, the stepped portion 5 of the resin container 52 is
A piezoelectric vibrator 51 is placed on the piezoelectric vibrator 5.
1 and a ring-shaped back cover 53 to cover the resin container 52.
After attaching the ring-shaped back cover 53, ultrasonic vibration
Alternatively, the welding margin 56 of the resin container 52 is melted to join the ring-shaped back cover 53 and the resin container 52, and at the same time the piezoelectric vibrator 51 is fixed (Utility Model No. 63-17
9117).

しかしながら、上述の圧電ブザー５０では、リング状の
裏蓋５３の厚み分があるために、圧電振動子５１の裏面
側には略裏Ｍ５３の厚み分に相当する空間５４が生じて
しまう。これにより、超音波振動装置からリング状の裏
蓋５３の所定位置に超音波振動（例えば１０〜２０μ５
ｐ−ｐ）を印加すると、超音波振動の振幅が圧電振動子
５１にも影響を及ぼし、圧電振動子５１が点線に示すよ
うに激しく共振してしまう。However, in the piezoelectric buzzer 50 described above, since there is a thickness corresponding to the ring-shaped back cover 53, a space 54 corresponding to approximately the thickness of the back M53 is created on the back side of the piezoelectric vibrator 51. As a result, ultrasonic vibration (for example, 10 to 20 μ5
pp), the amplitude of the ultrasonic vibration also affects the piezoelectric vibrator 51, causing the piezoelectric vibrator 51 to resonate violently as shown by the dotted line.

実際には、圧電振動子５１は印加した超音波振動の振幅
の数百倍にも達する振幅で共振してしまい、圧電振動子
５１を構成する圧電磁器５′７にひびや欠けが生じてし
まうという問題点があった。In reality, the piezoelectric vibrator 51 resonates with an amplitude several hundred times greater than the amplitude of the applied ultrasonic vibration, resulting in cracks or chips in the piezoelectric ceramic 5'7 that constitutes the piezoelectric vibrator 51. There was a problem.

また、圧電磁器５ｑにひびや欠けが生じない程度の範囲
で超音波を印加すると樹脂製容器５２とリング状の裏Ｉ
Ｅ５３との接合が不十分となり、圧電ブザー５０に軽い
機械的を応力や熱サイクルを与えただけで、容易に分解
してまうという問題点があり、圧電ブザーの超音波溶着
による固定方法は殆ど実用に至っていなかった。Moreover, if ultrasonic waves are applied within a range that does not cause cracks or chips to the piezoelectric ceramic 5q, the resin container 52 and the ring-shaped back I
There is a problem in that the bonding with E53 is insufficient and the piezoelectric buzzer 50 easily disintegrates even if a slight mechanical stress or thermal cycle is applied to it, and most piezoelectric buzzers are fixed by ultrasonic welding. It had not been put into practical use.

〔発明の目的〕[Purpose of the invention]

本発明は上述の目的に鑑みて案出されたものであり、そ
の目的は圧電振動子を超音波振動を使用して容器の一部
を溶融・接着することにより固定し低コスト・高信頼性
の圧電ブザーを、また圧電磁器にひびや欠けが発生しな
い容易で高信頼性の製造方法を提供することにある。The present invention was devised in view of the above-mentioned purpose, and the purpose is to fix a piezoelectric vibrator by melting and gluing a part of the container using ultrasonic vibration, thereby achieving low cost and high reliability. An object of the present invention is to provide a piezoelectric buzzer and an easy and highly reliable manufacturing method that does not cause cracks or chips in the piezoelectric ceramic.

〔目的を達成するための具体的な手段〕上述の本発明の
目的を達成するために、本発明は、凹部を有する容器の
内壁部に連続又は断続して形成した段差部に、金属振動
板の一面に圧電素子が貼付された圧電振動子の端部を載
置され、さらに容器の内壁部の一部が超音波振動によっ
て溶融された挟持部によって固定された圧電ブザーを提
供し、また、凹部を有する容器の内壁部に連続又は断続
して形成した段差部に、圧電振動子の端部を載置し、さ
らに容器の内壁部の一部が超音波振動によって溶融して
固定する圧電ブザーの製造方法において、圧電振動子を
固定する挟持部は超音波振動を出力するホーン部を当接
して、また圧電振動子の圧電磁器は振動吸収材を介して
、超音波振動を印加する圧電ブザーの製造方法をを提供
する。[Specific Means for Achieving the Object] In order to achieve the above-mentioned object of the present invention, the present invention provides a metal diaphragm at a stepped portion formed continuously or intermittently on the inner wall of a container having a recessed portion. Provided is a piezoelectric buzzer in which an end of a piezoelectric vibrator having a piezoelectric element affixed thereto is placed on one surface thereof, and further fixed by a holding part in which a part of the inner wall of a container is melted by ultrasonic vibration, A piezoelectric buzzer in which an end of a piezoelectric vibrator is placed on a stepped portion formed continuously or intermittently on the inner wall of a container having a recessed portion, and a part of the inner wall of the container is melted and fixed by ultrasonic vibration. In the manufacturing method of Provides a manufacturing method.

〔実施例〕〔Example〕

以下、本発明の圧電ブザー及びその製造方法をを図面に
基づいて詳説する。EMBODIMENT OF THE INVENTION Hereinafter, the piezoelectric buzzer of this invention and its manufacturing method will be explained in detail based on drawings.

第１図は本発明の圧電ブザーの断面図である。FIG. 1 is a sectional view of the piezoelectric buzzer of the present invention.

本発明の圧電ブザー１０は、凹部１４の空所を有し、そ
の内壁部１１に連続的（全周囲）に形成された段差部１
２及び挟持部１３とを有する容器１と、該段差部１２に
載置され、挟持部１３によって固定された圧電振動子２
とから構成されるいる。The piezoelectric buzzer 10 of the present invention has a hollow space of a recess 14, and a stepped portion 1 formed continuously (around the entire circumference) on the inner wall portion 11 of the piezoelectric buzzer 10.
2 and a clamping part 13; and a piezoelectric vibrator 2 placed on the stepped part 12 and fixed by the clamping part 13.
It consists of.

容器１は、樹脂などを射出成型などで形成するとともに
、圧電振動子２が収納される凹部１４を有し、凹部１４
底面には放音穴１５が形成されている。容器ｌの内壁部
１１には、前記圧電振動子２が載置される段差部１２及
び第２図に示されるように超音波により溶着代（以下突
出部」６と記す。）が溶融されてなる挟持部１３が形成
されている。The container 1 is made of resin or the like by injection molding, and has a recess 14 in which the piezoelectric vibrator 2 is housed.
A sound emitting hole 15 is formed in the bottom surface. On the inner wall 11 of the container 1, a step 12 on which the piezoelectric vibrator 2 is placed and a welding margin (hereinafter referred to as a protrusion 6) are melted by ultrasonic waves as shown in FIG. A holding portion 13 is formed.

圧電振動子２は、ＰＺＴなどからなる厚み０．１−一程
度の圧電磁器２２と厚み０．１ａｉ鋼程度の円形金属振
動板２１からなり、円形状の金属振動板２１の一面の略
中央部分には圧電磁５２２がエポキシ樹脂、アクリル樹
脂などの接着剤で取着されている。The piezoelectric vibrator 2 is composed of a piezoelectric ceramic 22 made of PZT or the like and having a thickness of about 0.1-1, and a circular metal diaphragm 21 made of about 0.1 ai steel, and approximately in the center of one side of the circular metal diaphragm 21. A piezoelectric element 522 is attached to the plate with an adhesive such as epoxy resin or acrylic resin.

前記容器１と圧電振動子２とは、圧電振動子２の端部２
３、即ち金属振動板２１の端部２３が前記容器１の段差
部１２と超音波により溶融された挟持部１３との間に挟
持されることにより固定されている。The container 1 and the piezoelectric vibrator 2 are connected to the end portion 2 of the piezoelectric vibrator 2.
3, that is, the end portion 23 of the metal diaphragm 21 is fixed by being held between the stepped portion 12 of the container 1 and the holding portion 13 melted by ultrasonic waves.

第２図は、本発明の圧電ブザーの製造方法を説明するた
めの概略断面図である。FIG. 2 is a schematic cross-sectional view for explaining the method of manufacturing a piezoelectric buzzer of the present invention.

容器１の内壁部１１の段差部１２に圧電振動子２を載置
し、突出部１６を超音波振動により溶融して圧電振動子
２を溶着する工程を示す。The process of placing the piezoelectric vibrator 2 on the stepped portion 12 of the inner wall 11 of the container 1 and melting the protruding portion 16 by ultrasonic vibration to weld the piezoelectric vibrator 2 is shown.

図中、２０は超音波溶着装置であり、２４は超音波振動
を出力するためのホーン部であり、２５はクツション材
である。In the figure, 20 is an ultrasonic welding device, 24 is a horn portion for outputting ultrasonic vibrations, and 25 is a cushion material.

ホーン部２４は、熔融すべき突出部１６が形成されてい
る段差部１２にのみ当接するように、例えば容器１の段
差部１２に応じてリング状を成している。即ち、圧電振
動子２の少なくとも圧電磁５２２部分には直接ホーン部
２４から超音波振動が印加されることはない。The horn portion 24 has a ring shape, for example, corresponding to the step portion 12 of the container 1 so as to contact only the step portion 12 where the protrusion 16 to be melted is formed. That is, ultrasonic vibrations are not directly applied from the horn portion 24 to at least the piezoelectric 522 portion of the piezoelectric vibrator 2 .

クツシコン材２５は超音波溶着装Ｎ２０の凹部２６に圧
電振動子２の少なくとも圧電磁器２２部分に対応する部
分に形成されており、超音波溶着の際、圧電振動子２の
端部側から伝わる超音波振動により誘発され、その振動
により発生する圧電磁器２２の共振を吸収するためのも
のである。具体的には、超音波溶着装置２０の少なくと
も圧電磁器２２に対応する部分に所定深さ、例えば０゜
８ｍｍの凹部２６に、厚み１．０ｏｎの発泡材が配置さ
れて構成されている。即ち、ホーン部２４の表面よりも
該クツション材２５が若干量（ｏ、２朋程度）突出して
いる。The cushioning material 25 is formed in the recess 26 of the ultrasonic welding device N20 in a portion corresponding to at least the piezoelectric ceramic 22 portion of the piezoelectric vibrator 2, and is used to prevent ultrasonic waves transmitted from the end side of the piezoelectric vibrator 2 during ultrasonic welding. This is for absorbing the resonance of the piezoelectric ceramic 22 induced by the acoustic vibration and generated by the vibration. Specifically, at least a portion of the ultrasonic welding device 20 corresponding to the piezoelectric ceramic 22 is configured such that a foam material having a thickness of 1.0 on is disposed in a recess 26 having a predetermined depth, for example, 0°8 mm. That is, the cushion material 25 protrudes by a slight amount (about 2 mm) from the surface of the horn portion 24.

先ず、容器１の段差部１２に圧電振動子２の端部が突出
部１６が略接するように載置する。First, the piezoelectric vibrator 2 is placed on the stepped portion 12 of the container 1 so that the end portion of the piezoelectric vibrator 2 and the protruding portion 16 are substantially in contact with each other.

次に、超音波溶着装置２０を容器１の開口部側より特に
突出部１６に当接させる。このとき超音波溶着装置２０
のホーン部２４は段差部１２の突出部１６に、クツショ
ン材２５は圧電振動子２の圧電磁器２２に夫々接触され
ることになる。Next, the ultrasonic welding device 20 is brought into contact with the protrusion 16 in particular from the opening side of the container 1 . At this time, the ultrasonic welding device 20
The horn portion 24 is brought into contact with the protruding portion 16 of the stepped portion 12, and the cushion material 25 is brought into contact with the piezoelectric ceramic 22 of the piezoelectric vibrator 2.

次いで突出部１６にホーン部２４よりに超音波振動を印
加する。超音波振動条件は、例えばホーン振動１０〜２
０　ａｍｐ　−ｐ　、印加時間２〜５ｓｅｃである。こ
れにより、突出部１６は溶融し、その樹脂がだれ、圧電
振動子２の端子の一部を覆うことになり、かかる樹脂だ
れが挟持部１３となる。Next, ultrasonic vibration is applied to the protruding portion 16 by the horn portion 24 . The ultrasonic vibration conditions are, for example, horn vibration of 10 to 2
0 amp −p and an application time of 2 to 5 seconds. As a result, the protruding portion 16 melts and its resin drips to cover a portion of the terminal of the piezoelectric vibrator 2, and this resin drip becomes the clamping portion 13.

これにより、圧電振動子２は強固に固定され（溶着）さ
れる。Thereby, the piezoelectric vibrator 2 is firmly fixed (welded).

この圧電振動子２を溶着するために超音波振動で容器１
の突出部１６を溶融している時には、圧電振動子２の少
なくとも圧電磁器２２部分はクツション材２５と接する
ため、超音波振動によって圧電磁器２２に生じる大きな
共振振動がクツション材２５に吸収される。これにより
圧電磁器２２にひびや欠けが発生を未然に防止できる。In order to weld this piezoelectric vibrator 2, ultrasonic vibration is applied to the container 1.
When the protrusion 16 of the piezoelectric ceramic 22 is melted, at least the piezoelectric ceramic 22 portion of the piezoelectric vibrator 2 is in contact with the cushion material 25, so that the large resonant vibration generated in the piezoelectric ceramic 22 due to ultrasonic vibration is absorbed by the cushion material 25. This can prevent cracks and chips from occurring in the piezoelectric ceramic 22.

なお、クツシコン材２５の表面突出量が段差部１２に形
成した突出部１６の突出量よりも小さい場合には、ホー
ン部２４を突出部１６に当接させた初期状態では圧電磁
５２２とクツシコン材２５との間に極めて微小な間隙が
存在するが、突出部１６が溶融し、圧電振動子２が溶着
される過程で完全にクツション材２５と圧電振動子２と
が当接し、ひびや欠けが生じる前に圧電磁器２２の共振
振動が吸収されることになる。Note that if the amount of surface protrusion of the cushioning material 25 is smaller than the amount of protrusion of the projection 16 formed on the stepped portion 12, the piezoelectric element 522 and the cushioning material are Although there is an extremely small gap between the cushion material 25 and the piezoelectric vibrator 2, in the process of melting the protruding portion 16 and welding the piezoelectric vibrator 2, the cushion material 25 and the piezoelectric vibrator 2 completely come into contact, and no cracks or chips occur. The resonance vibration of the piezoelectric ceramic 22 is absorbed before it occurs.

これにより、超音波振動を突出部１６に充分に長い時間
印加しても圧電磁器２２が破壊されるがなく、圧電振動
子２を容器１に強固に接合することが可能となり、接合
信頼性が向上する製造方法となる。This prevents the piezoelectric ceramic 22 from being destroyed even if ultrasonic vibration is applied to the protrusion 16 for a sufficiently long time, making it possible to firmly bond the piezoelectric vibrator 2 to the container 1, and improving bonding reliability. This is an improved manufacturing method.

以上の構成により圧電振動子２を容器１に載置し、容器
１に形成した突出部１６を超音波振動により溶融し、圧
電振動子２を溶着したため、従来のように接着剤の乾燥
による加工時間の制約や、裏蓋や圧電振動子２の挟持体
などの部品の増加、超音波溶着の振動印加条件の制約な
どが完全に解消されることにより、ｉｌ魔性、低コスト
、高信頼性に優れた圧電ブザーとなる。With the above configuration, the piezoelectric vibrator 2 is placed on the container 1, the protrusion 16 formed on the container 1 is melted by ultrasonic vibration, and the piezoelectric vibrator 2 is welded. By completely eliminating time constraints, an increase in the number of parts such as the back cover and the clamping body for the piezoelectric vibrator 2, and constraints on vibration application conditions for ultrasonic welding, it is possible to achieve illicit performance, low cost, and high reliability. Makes an excellent piezoelectric buzzer.

尚、上述の実施例では、突出部１６は、容器内壁部の段
差部に形成されているが、直接容器内壁部から突出させ
てもよい。また、り、ジョン材２５として発泡材を用い
たが、その他にシリコーン樹脂を超音波溶着装置２０の
凹部２６に充填し、表面張力により、その中央部分（圧
電磁器と当接する部分）を盛り上がらせてもよい。さら
に、内壁部に形成される段差部及び突出部１６を全周囲
に形成することにより、圧電振動子の全周囲を固定する
ことになるが、接合強度の許容範囲内で断続的に設けて
も構わない。In the above-mentioned embodiment, the protrusion 16 is formed at the stepped portion of the inner wall of the container, but it may also be made to protrude directly from the inner wall of the container. In addition, although a foamed material was used as the John material 25, silicone resin was also filled in the recess 26 of the ultrasonic welding device 20, and the center part (the part in contact with the piezoelectric ceramic) was raised due to surface tension. You can. Furthermore, by forming the stepped portion and the protruding portion 16 formed on the inner wall portion around the entire circumference, the entire circumference of the piezoelectric vibrator is fixed, but it may be provided intermittently within the allowable range of bonding strength. I do not care.

〔発明の効果〕〔Effect of the invention〕

以上のように、本発明によれば、凹部を有する容器の内
壁部に連続又は断続して形成した段差部に、金属振動板
の一面に圧電素子が貼付された圧電振動子の端部を載置
され、さらに容器の内壁部の一部が超音波振動によって
溶融された挟持部によって固定されることにより、直接
容器に接着固定することにより、裏蓋や圧電振動子の挟
持体かの不要となり、部品点数の低減及び組立工程の簡
略化により、安価な圧電ブザーが提供できる。As described above, according to the present invention, the end portion of a piezoelectric vibrator having a piezoelectric element affixed to one surface of a metal diaphragm is mounted on the step portion formed continuously or intermittently on the inner wall portion of a container having a recessed portion. In addition, a part of the inner wall of the container is fixed by a clamping part that is melted by ultrasonic vibration, and by directly adhesively fixing it to the container, there is no need for a back cover or a clamping body for the piezoelectric vibrator. By reducing the number of parts and simplifying the assembly process, an inexpensive piezoelectric buzzer can be provided.

また、凹部を有する容器の内壁部に連続又は断続して形
成した段差部に、圧電振動子のｌｆｉ部を載置し、さら
に容器の内壁部の一部が超音波振動によって溶融して固
定する圧電ブザーの製造方法において、圧電振動子は振
動吸収材を介して、また熔融すべき容器の内壁部の一部
は超音波振動を印加するホーン部を当接させ、超音波振
動を印加することにより、圧電磁器に超音波振動の共振
が発生することがなく、圧電磁器にひびや欠けなどが生
じ、溶着に充分な超音波を印加することができので、信
頼性の高い圧電ブザーの製造方法が達成される。In addition, the lfi part of the piezoelectric vibrator is placed on a stepped part formed continuously or intermittently on the inner wall of the container having a recessed part, and further, a part of the inner wall of the container is melted and fixed by ultrasonic vibration. In the method for manufacturing a piezoelectric buzzer, ultrasonic vibrations are applied to the piezoelectric vibrator through a vibration absorbing material, and a horn unit that applies ultrasonic vibrations is brought into contact with a part of the inner wall of the container to be melted. As a result, resonance of ultrasonic vibrations does not occur in the piezoelectric ceramic, cracks and chips do not occur in the piezoelectric ceramic, and sufficient ultrasonic waves can be applied for welding, making it possible to produce a highly reliable piezoelectric buzzer. is achieved.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の圧電ブザーの概略断面図である。 第２図は本発明に係る圧電ブザーの製造方法を説明する
ための概略断面図である。 第３図乃至第５図は従来の圧電ブザーの概略断面図であ
る。 １．３２．４２．５２・・・容器 ２．３１．４１．５１・・・・圧電振動子１１・・・・
・・・・・内壁部 １２・・・・・・・・・段差部 １３・・・・・・・・・挟持部 １６・・・・・・・・・突出部FIG. 1 is a schematic sectional view of a piezoelectric buzzer of the present invention. FIG. 2 is a schematic cross-sectional view for explaining a method of manufacturing a piezoelectric buzzer according to the present invention. 3 to 5 are schematic cross-sectional views of a conventional piezoelectric buzzer. 1.32.42.52...Container 2.31.41.51...Piezoelectric vibrator 11...
...Inner wall part 12...Stepped part 13...Campling part 16...Protrusion part

Claims (2)

【特許請求の範囲】[Claims] （１）凹部を有する容器の内壁部に連続又は断続して形
成した段差部に、金属振動板の一面に圧電素子が貼付さ
れた圧電振動子の端部が載置され、さらに容器の内壁部
の一部が超音波振動によって溶融された挟持部によって
溶着されたことを特徴とする圧電ブザー。(1) An end portion of a piezoelectric vibrator having a piezoelectric element affixed to one side of a metal diaphragm is placed on a stepped portion formed continuously or intermittently on the inner wall portion of the container having a recessed portion, and further on the inner wall portion of the container. A piezoelectric buzzer characterized in that a part of the buzzer is welded by a clamping part that is melted by ultrasonic vibration. （２）凹部を有する容器の内壁部に連続又は断続して形
成した段差部に、圧電振動子の端部を載置し、さらに容
器の内壁部の一部が超音波振動によって溶融して固定す
る圧電ブザーの製造方法において、 圧電振動子を固定する挟持部は超音波振動を出力するホ
ーン部を当接して、また圧電振動子の圧電磁器は振動吸
収材を介して、超音波振動を印加することを特徴とする
圧電ブザーの製造方法。(2) The end of the piezoelectric vibrator is placed on the step part formed continuously or intermittently on the inner wall of the container having a recessed part, and then a part of the inner wall of the container is melted and fixed by ultrasonic vibration. In the method for manufacturing a piezoelectric buzzer, the holding part that fixes the piezoelectric vibrator contacts a horn part that outputs ultrasonic vibration, and the piezoelectric ceramic of the piezoelectric vibrator applies ultrasonic vibration through a vibration absorbing material. A method of manufacturing a piezoelectric buzzer characterized by:
JP1048784A 1989-02-28 1989-02-28 Piezoelectric buzzer and its manufacture Pending JPH02226997A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1048784A JPH02226997A (en) 1989-02-28 1989-02-28 Piezoelectric buzzer and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1048784A JPH02226997A (en) 1989-02-28 1989-02-28 Piezoelectric buzzer and its manufacture

Publications (1)

Publication Number Publication Date
JPH02226997A true JPH02226997A (en) 1990-09-10

Family

ID=12812871

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1048784A Pending JPH02226997A (en) 1989-02-28 1989-02-28 Piezoelectric buzzer and its manufacture

Country Status (1)

Country Link
JP (1) JPH02226997A (en)

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