GB1394289A - Mechanical filter and method for manufacturing the filter - Google Patents

Mechanical filter and method for manufacturing the filter

Info

Publication number
GB1394289A
GB1394289A GB3722072A GB3722072A GB1394289A GB 1394289 A GB1394289 A GB 1394289A GB 3722072 A GB3722072 A GB 3722072A GB 3722072 A GB3722072 A GB 3722072A GB 1394289 A GB1394289 A GB 1394289A
Authority
GB
United Kingdom
Prior art keywords
resonators
filter
coupling
resonator
projections
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
GB3722072A
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of GB1394289A publication Critical patent/GB1394289A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/48—Coupling means therefor
    • H03H9/50—Mechanical coupling means
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
    • H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
    • 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

Abstract

1394289 Electro-mechanical filters LICENTIA PATENT-VERWALTUNGS GmbH 9 Aug 1972 [24 Aug 1971] 37220/72 Heading H3V An electromechanical filter comprises a set of intermediate bending mode resonators 2, and input and output resonators 1, 1<SP>1</SP> to which ceramic transducers 8 are attached, the resonators, which bend in the plane of the resonators as a whole, being interconnected at each of their end faces, with a pair of welded on nickel alloy coupling wires 3. The resonators may differ in length and/or cross sectional area. Respective coupling wires may be selected from different draw batches, so that the sum of their cross sections corresponds to a given value. A holder comprises a pair of projections 4 for each resonator, each stressed in torsion during use and possibly stamped or etched from an integral piece of sheet metal, Fig. 7 (not shown). The projections may each be flat, Fig. 5 (not shown), or an apertured flanged member Fig. 6 (not shown), dimension (L) having a given relation to the vibratory wavelength. The input and output resonators 1, 1<SP>1</SP>, to ensure the same resonance frequency as resonators 2, in spite of the effect of transducers 8, may be made of greater diameter than, or shorter than the remaining resonators, Fig. 9 (not shown), possibly with projections (9), Fig. 8 (not shown) to hold the coupling wires, or there may be a progressive change in resonator length, Fig. 10 (not shown). The resonators are glued, spot welded, or soldered to the holders, and are fine tuned by grinding their end faces. The coupling between adjacent resonators may change progressively, by varying resonator cross-section, or spacing l K . A housing 6 is provided. Design of a 50 KHz filter is discussed, Fig. 4 (not shown), displaying how the inter-resonator spacing (l k ) effects upper and lower band-edge, and middle frequencies, (# u ,# o ,# m ), (# r ) being the resonators' resonance frequency. Attenuation poles may be provided by coupling of non-adjacent resonators by further coupling elements. The filter may be a band-pass filter in a carrier frequency system.
GB3722072A 1971-08-24 1972-08-09 Mechanical filter and method for manufacturing the filter Expired GB1394289A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2142332A DE2142332C2 (en) 1971-08-24 1971-08-24 Mechanical filter and method of making the filter

Publications (1)

Publication Number Publication Date
GB1394289A true GB1394289A (en) 1975-05-14

Family

ID=5817620

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3722072A Expired GB1394289A (en) 1971-08-24 1972-08-09 Mechanical filter and method for manufacturing the filter

Country Status (8)

Country Link
US (1) US3808563A (en)
JP (1) JPS4830841A (en)
DE (1) DE2142332C2 (en)
FR (1) FR2151391A5 (en)
GB (1) GB1394289A (en)
IL (1) IL40139A (en)
IT (1) IT963927B (en)
SE (1) SE382726B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1437288A (en) * 1973-06-11 1976-05-26 Kokusai Electric Co Ltd Mechanical filter
JPS5512254B2 (en) * 1973-07-03 1980-03-31
JPS5528021Y2 (en) * 1973-08-04 1980-07-04
JPS5645223Y2 (en) * 1975-04-19 1981-10-22
JPS53105032A (en) * 1977-02-25 1978-09-12 Hazama Gumi Method of excavating subbase using high pressure water jet
DE2729839C3 (en) * 1977-07-01 1981-03-26 Siemens AG, 1000 Berlin und 8000 München Carrier-frequency communication system with pre-modulation
FR2396456A1 (en) * 1977-07-01 1979-01-26 Telecommunications Sa ELECTROMECHANICAL FILTERS IMPROVEMENTS

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2647949A (en) * 1949-10-27 1953-08-04 Rca Corp Adjustable tuning for mechanical resonators
US2870521A (en) * 1955-02-24 1959-01-27 Gulton Ind Inc Method of adjusting the resonant frequency of a vibrating system
US2845697A (en) * 1957-03-11 1958-08-05 Zenith Radio Corp Method of manufacturing a longitudinal mode mechanical vibrator
DE1100834B (en) * 1957-04-06 1961-03-02 Telefunken Gmbh Mechanical frequency filter
NL233996A (en) * 1957-12-12
DE1541975C3 (en) * 1967-05-12 1975-03-06 Siemens Ag, 1000 Berlin U. 8000 Muenchen Electromechanical belt filter
CH491545A (en) * 1968-05-29 1970-05-31 Siemens Ag Electromechanical filter
US3717828A (en) * 1971-04-07 1973-02-20 N Arleevskaya Multisection electromechanical band pass filter with resonators and transducers mechanically connected together and to the filter baseplate

Also Published As

Publication number Publication date
SE382726B (en) 1976-02-09
DE2142332C2 (en) 1983-07-14
US3808563A (en) 1974-04-30
IL40139A0 (en) 1972-10-29
JPS4830841A (en) 1973-04-23
FR2151391A5 (en) 1973-04-13
IT963927B (en) 1974-01-21
IL40139A (en) 1975-06-25
DE2142332A1 (en) 1973-03-01

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee