US3679919A - Ceramic resonators - Google Patents

Ceramic resonators Download PDF

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Publication number
US3679919A
US3679919A US140482A US3679919DA US3679919A US 3679919 A US3679919 A US 3679919A US 140482 A US140482 A US 140482A US 3679919D A US3679919D A US 3679919DA US 3679919 A US3679919 A US 3679919A
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US
United States
Prior art keywords
inner casing
resonator element
ceramic resonator
ceramic
members
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 - Lifetime
Application number
US140482A
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English (en)
Inventor
Noboru Ichinose
Katsunori Yokoyama
Hisashi Nishikawa
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.)
Toshiba Corp
Toshiba TEC Corp
Original Assignee
Tokyo Shibaura Electric Co Ltd
Tokyo Electric 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 Tokyo Shibaura Electric Co Ltd, Tokyo Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Application granted granted Critical
Publication of US3679919A publication Critical patent/US3679919A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/05—Holders or supports
    • H03H9/09—Elastic or damping supports

Definitions

  • a ceramic resonator of the type comprising an outer casing, a disc shaped ceramic resonator element, a pair of resilient terminal members on both sides of the resonator element, each including a projection for supporting the resonator element, and a split inner casing contained in the outer casing for containing the resonance element and terminal members, one half of the split inner casing is provided with an annular rib on its mating surface and a cylindrical recess inside the annular rib, and the other half of the split inner casing is provided with a cylindrical recess on its mating surface for receiving the annular rib whereby when the resonator and the terminal members are assembled in a space defined by the recesses of the inner casing halves, the resonator element is resiliently supported between the projections of the terminal members at its geometrical center.
  • This invention relates to a ceramic resonator and more particularly to a ceramic resonator for use in a filter wherein a ceramic resonator element disposed in a space of an inner casing is securely supported by two resilient terminal plates.
  • a ceramic element is utilized as a resonator element and the expansion vibration or contour vibration of the element is utilized for performing the filtering function.
  • the geometrical center of the element coincides with the nodes of respective vibrations, it is possible to provide the desired filtering characteristics by supporting the element at its physical center because such method of supporting does not disturb the mode of vibration of the resonator element.
  • a pair of resilient supporting members are provided with opposing projections adapted to engage and support the geometrical center of the element.
  • lead wires are soldered directly to the geometrical center thus supporting the element by the lead wires.
  • both of these supporting mechanisms have been used widely because of their simple construction, they are not yet satisfactory.
  • the mechanism utilizing the resilient supporting members as the projections are urged against the element merely by the resiliency-of the supporting members, the supporting force is not sufficient so that the outer ends of the projections may disengage the geometrical center of the element thus varying the filter characteristics.
  • the supporting mechanism using lead wires it is necessary to reduce as far as possible the diameter of the lead wires for minimizing the effect thereof upon the vibration of the element.
  • fine lead wires are liable to be broken by mechanical vibrations and shocks.
  • Another object of this invention is to provide a new and improved ceramic resonator which can well withstand mechanical vibrations and shocks and has stable operating characteristics not affected by such vibrations and shocks.
  • a ceramic resonator of the type comprising an outer casing, a disc shaped ceramic resonator element, a pair of resilient terminal members on both sides of the resonator element, each one of the terminal members including a projection for supporting the resonator element, and a split inner casing for containing the resonator element and terminal members, the inner casing being contained in the outer casing, characterized in that one half of the split inner casing includes an annular rib on its mating surface and a cylindrical recess inside the annular rib and the other half includes a cylindrical recess on its mating surface for receiving the annular rib whereby when the resonator element and the terminal members are assembled in a space defined by the recesses of the inner casing halves, the resonator element is resiliently supported between the projections of the terminal members at its geometrical center.
  • the recesses of the outer casing halves are dimensioned to snugly receive the terminal members and the resonator element so as to minimize their lateral displacement when subjected to mechanical vibrations or shocks.
  • FIG. I shows an exploded perspective view of various component elements of one example of the ceramic filter embodying the invention.
  • FIG. 2 shows a section of one half of the split type inner casing shown in FIG. I and taken along a line II-ll;
  • FIG. 3 shows a longitudinal section of the assembled ceramic filter
  • FIG. 4 shows a perspective view of one half of a modified split type inner casing.
  • the ceramic resonator shown in FIGS. 1 to 3 comprises a circular disc shaped ceramic resonator element 1 having electrodes 2 coated on the opposite sides thereof by firing silver films.
  • Two resilient terminal plates lla and llb are made of resilient electroconductive material such as phosphor bronze for example, and respectively comprise circular enlarged portions Ila and 11b, of equal diameter and leads 1 la and llbg integral with and extending from the enlarged portions. Enlarged portions are provided with projections 12 and 14 respectively.
  • One of the terminal plates llb is formed with a U shaped slot around the projection 14, thus. forming a cut out tongue 13.
  • the inner casing comprises split halves 5a and 5b of generally rectangular configuration. Each half is formed of strong insulating material, polyacetal resin for example, and each provided with a recess so that when two halves are assembled together there is formed a cavity adapted to receive resonator element 1 and two resilient terminal plates lla and 11b.
  • the assembly is contained in an outer casing 3 with tongues 3b, and 3b which are used to mount the resultant assembly on a chassis or a printed board.
  • One half 5a of the inner casing is provided with an annular rib 4 at its mating surface, the diameter ofthe inner cylindrical surface or recess 4' of the rib 4 being slightly larger than the diameter of the resonator element 1, by for example 0.2 to 2 millimeters.
  • a second circular' recess 4" of smaller diameter to contain the enlarged portion of the resilient terminal plate.
  • a portion of rib 4 is notched as at 4a and a tangential rib 7 is provided in parallel with one side edge of the half 5a. Ribs 4 and 7 have the same height.
  • the other half 5b of the inner casing is provided with three cylindrical recesses 6, 6 and 6" of decreasing diameters thus forming a stepped construction.
  • the outermost recess 6 snugly receives annular rib 4 of first half 5a
  • the intermediate recess 6' has the same diameter as said cylindrical recess 4' and the innermost recess 6 receives the enlarged portion of the resilient terminal plate.
  • a rectangular recess 8 At the bottom of recess 6" is formed a rectangular recess 8.
  • this other half 5b is provided with a relatively shallow slot 9 at a position corresponding to notch 4a of rib 4 and a relatively deep groove 10 adapted to receive straight rib 7.
  • Recess 8 is dimensioned to receive tongue 13 of the resilient terminal plate llb when the tongue is slightly bent down.
  • FIG. 3 Component parts of the ceramic resonator described above are assembled together as shown in FIG. 3. More particularly, enlarged portion Ila of terminal plate Ila is fitted in recess 4" of the half 5a and then the resonator element is placed in recess 4 inside rib 4 so that the geometric center of the element 1 is supported by projection 12 of terminal plate Ila. The enlarged portion 11b, of terminal plate Ilb is placed in recess 6" of the other half 5b such that upon assemblage, the projection 14 will come to engage the geometrical center of the other electrode 2. Thereafter, two halves are assembled together by fitting ribs 4 and 7 in recess 6 and groove 10 respectively. Then, lead llb will be firmly held between rib 7 and groove 10 and lead Ila will be received in notch 4a and groove 9.
  • the resiliency of tongue 13 firmly holds the element in position.
  • the thickness of the cavity defined by recesses 4' and 6 is designed to be slightly larger than the thickness of the element 1.
  • the resonator element is clamped between resilient terminal plates with a sutficient pressure. Further, as the lateral movement of the resonator element is prevented by recesses 4 and 6 of the inner casing halves, the resonator element is always maintained in position with its geometrical center aligned with the projection of the terminal plates regardless of large vibrations or shocks, whereby variation of the characteristics of the resonator caused by vibrations or shocks can be positively prevented.
  • the periphery of the resonator element engages the inner surfaces of the recessed 4' and 6 so that it is possible to limit the lateral displacement of the element or hence the variations in fr and Q to a minimum.
  • the continuous annular rib 4 shown in FIG. 1 may be replaced by a plurality of circumferentially spaced apart segments of rib 41 as shown in Fig. 4. Further, it is clear that ribs 4 and 7 on one half 50 and grooves 9 and 10 on the other half 5b may be interchanged, and that tongue 13 may be formed for both terminal plates.
  • a ceramic resonator comprising:
  • each one of said terminal members having a projection for electrically contacting and supporting said resonator element
  • an inner casing contained in said outer casing having a cavity for containing said resonator element and said terminal members therein, said cavity having a diameter slightly larger than that of said resonator element.
  • said inner casing including two members, the first inner casing member being provided with an annular rib and a cylindrical recess inside of said annular rib on one surface thereof, and the second inner casing member being provided with a cylindrical recess for receiving said annular rib of the first inner casing member, said first and second inner casing members being mated with each other to define said cavity by said recesses thereof, said ceramic resonator element and resilient terminal members being mounted within said cavity such that said ceramic resonator element is resiliently supported between said projections of said resilient terminal members at its geometrical center, with a space between said ceramic resonator element and the walls of said cavity.
  • annular rib on the first inner casing member comprises a plurality of circumferentially spaced apart segments.
  • the ceramic resonator according to claim 1 comprising an additional recess formed substantially centrally of the inner wall of at least one of said first and second inner casing members for receiving at least a portion of a resilient terminal member.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
US140482A 1970-05-13 1971-05-05 Ceramic resonators Expired - Lifetime US3679919A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970045922U JPS5027869Y1 (en, 2012) 1970-05-13 1970-05-13

Publications (1)

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US3679919A true US3679919A (en) 1972-07-25

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US140482A Expired - Lifetime US3679919A (en) 1970-05-13 1971-05-05 Ceramic resonators

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US (1) US3679919A (en, 2012)
JP (1) JPS5027869Y1 (en, 2012)
GB (1) GB1337614A (en, 2012)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980911A (en) * 1974-02-11 1976-09-14 Cts Corporation Support structure and housing for piezoelectric crystal
DE2922451A1 (de) * 1978-06-02 1979-12-13 Murata Manufacturing Co Piezoelektrische einrichtung
US4382203A (en) * 1980-11-03 1983-05-03 Radio Materials Corporation Housing and spring support for piezoelectric resonator
US4684843A (en) * 1981-11-20 1987-08-04 Ngk Spark Plug Co., Ltd. Piezo-resonator and manufacturing method therefor
US5213513A (en) * 1992-02-27 1993-05-25 Seatt Corporation Electric terminal
US5373213A (en) * 1991-10-18 1994-12-13 Seagate Technology, Inc. Apparatus for sensing operating shock on a disk drive
US6025669A (en) * 1996-07-01 2000-02-15 Murata Manufacturing Co., Ltd. Piezoelectric resonator and piezoelectric components using the same
US20050269908A1 (en) * 2004-06-03 2005-12-08 Chin-Wen Chou Piezoelectric blades anchoring structure
CN116053737A (zh) * 2016-10-25 2023-05-02 株式会社Kmw 具有空腔结构的无线频率滤波器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60129717U (ja) * 1984-02-08 1985-08-30 日本電波工業株式会社 圧電振動子

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448352A (en) * 1946-03-26 1948-08-31 Sperry Prod Inc Piezoelectric crystal mounting means
US2454244A (en) * 1945-02-19 1948-11-16 Carlton H Wintermute Moistureproof housing for piezoelectrtic elements
US3255431A (en) * 1960-10-06 1966-06-07 Gulton Ind Inc Hydrophone
US3299301A (en) * 1964-08-12 1967-01-17 Gen Instrument Corp Piezoelectric ceramic filter
US3359435A (en) * 1965-05-04 1967-12-19 James E Webb Holder for crystal resonators
US3453458A (en) * 1965-04-19 1969-07-01 Clevite Corp Resonator supporting structure
US3562764A (en) * 1968-10-25 1971-02-09 Murata Manufacturing Co Annular type ceramic filter device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2454244A (en) * 1945-02-19 1948-11-16 Carlton H Wintermute Moistureproof housing for piezoelectrtic elements
US2448352A (en) * 1946-03-26 1948-08-31 Sperry Prod Inc Piezoelectric crystal mounting means
US3255431A (en) * 1960-10-06 1966-06-07 Gulton Ind Inc Hydrophone
US3299301A (en) * 1964-08-12 1967-01-17 Gen Instrument Corp Piezoelectric ceramic filter
US3453458A (en) * 1965-04-19 1969-07-01 Clevite Corp Resonator supporting structure
US3359435A (en) * 1965-05-04 1967-12-19 James E Webb Holder for crystal resonators
US3562764A (en) * 1968-10-25 1971-02-09 Murata Manufacturing Co Annular type ceramic filter device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980911A (en) * 1974-02-11 1976-09-14 Cts Corporation Support structure and housing for piezoelectric crystal
DE2922451A1 (de) * 1978-06-02 1979-12-13 Murata Manufacturing Co Piezoelektrische einrichtung
US4382203A (en) * 1980-11-03 1983-05-03 Radio Materials Corporation Housing and spring support for piezoelectric resonator
US4684843A (en) * 1981-11-20 1987-08-04 Ngk Spark Plug Co., Ltd. Piezo-resonator and manufacturing method therefor
US5373213A (en) * 1991-10-18 1994-12-13 Seagate Technology, Inc. Apparatus for sensing operating shock on a disk drive
US5213513A (en) * 1992-02-27 1993-05-25 Seatt Corporation Electric terminal
US6025669A (en) * 1996-07-01 2000-02-15 Murata Manufacturing Co., Ltd. Piezoelectric resonator and piezoelectric components using the same
US20050269908A1 (en) * 2004-06-03 2005-12-08 Chin-Wen Chou Piezoelectric blades anchoring structure
US7235916B2 (en) * 2004-06-03 2007-06-26 Zippy Technology Corp. Piezoelectric blades anchoring structure
CN116053737A (zh) * 2016-10-25 2023-05-02 株式会社Kmw 具有空腔结构的无线频率滤波器

Also Published As

Publication number Publication date
GB1337614A (en) 1973-11-14
DE2123823A1 (de) 1971-11-25
JPS5027869Y1 (en, 2012) 1975-08-18
DE2123823B2 (de) 1976-01-29

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