US2808572A - Center coupled filter - Google Patents

Center coupled filter Download PDF

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Publication number
US2808572A
US2808572A US469388A US46938854A US2808572A US 2808572 A US2808572 A US 2808572A US 469388 A US469388 A US 469388A US 46938854 A US46938854 A US 46938854A US 2808572 A US2808572 A US 2808572A
Authority
US
United States
Prior art keywords
supporting
discs
attached
drive wire
disc
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
US469388A
Other languages
English (en)
Inventor
Lloyd M Ibsen
William E Whittington
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.)
Collins Radio Co
Original Assignee
Collins Radio Co
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
Priority to BE540777D priority Critical patent/BE540777A/xx
Priority to NL95629D priority patent/NL95629C/xx
Priority to NL199657D priority patent/NL199657A/xx
Priority to US469388A priority patent/US2808572A/en
Application filed by Collins Radio Co filed Critical Collins Radio Co
Priority to GB23463/55A priority patent/GB781033A/en
Priority to CH332314D priority patent/CH332314A/fr
Priority to FR1153858D priority patent/FR1153858A/fr
Priority to DEC11889A priority patent/DE1116326B/de
Application granted granted Critical
Publication of US2808572A publication Critical patent/US2808572A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H03H9/62—Filters comprising resonators of magnetostrictive material
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/135—Driving means, e.g. electrodes, coils for networks consisting of magnetostrictive materials
    • 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

Definitions

  • This invention relates in general to electromechanical filters and in part to a center-coupled filter which elimiiates spurious responses and which is relatively broad and.
  • the present invention relates to an improved electromechanical filter which comprises a plurality of resonating discs coupled together by a central drive and output wire. A plurality of supporting wires are attached to the peripheries of the discs and furnish mechanical support.
  • a feature of the present invention is an electromechanical filter which has very broad band and wherein the spurious response is greatly reduced.
  • Figure 1 is a top view of the electromechanical filter
  • Figure 2 is a sectional view taken on line 2-2 of Figure 1;
  • Figure 3 is a side view illustrating a modification of the invention.
  • Figure 1 illustrates a base plate 10 on which is mounted a pair of supporting stand-offs 11 and 12.
  • Standoffs 11 and 12 are each formed in two parts with bottom parts 13 and 14, respectively, and top parts 15 and 16, respectively.
  • a pair of cylindrical members 19 and 21 are held between the upper and lower parts of the stand-offs.
  • a pair of coil forms 22 and 23 are supported within the cylindrical members 19 and 21, and support windings 24 and 2.6, respectively.
  • Winding 24 has leads 27 and 28 which are connected to terminals 29 and 31 mounted on the base plate 10.
  • the winding 26 has leads 32 and 33 which are connected respectively to terminals 34 and 36 that are attached to the base plate 10.
  • Attached to one end of the cylindrical member 19 is a disc 37.
  • the disc 3'7 is formed with a central opening 38 for a purpose to be later described.
  • One end of the cylindrical member 21 has attached thereto a disc 39 which 7is formed with a central opening 41.
  • a plurality of supporting wires 42 extend from disc 37 to disc 39 and are welded to the peripheries thereof.
  • Mounted between the discs 37 and 39 are a plurality of active resonating discs 43 through 48.
  • the coil forms 22 and 23 are formed with openings 49 and 51, respectively, and a longitudinal driving wire 52 extends through the openings 49 and 51, and pass through the discs 37, 39 and 43 through 48.
  • the drive wire 52 does not engage the discs 37 and 39 because the openings 38 and 41 are larger than the outer diameter of the wire.
  • drive wire 52 is connected to each of the discs 43 through 48 at the center. This connection is made by drilling holes through the discs 43 through 48 and by welding the wire 52 to each disc.
  • a biasing magnet 53 is mounted adjacent coil 24 and a magnet 54 is mounted adjacent coil 26.
  • the driving rod might be from 15 to 30 thousandths in diameter and might be constructed of a nickel-iron alloy as NiSpan C.
  • the discs might also be constructed of NiSpan C.
  • Applicant has constructed filters according to this invention which has a passband of 455 kilocycles,
  • Figure 3 illustrates a modification of this invention wherein the number of supporting Wires have been increased until they form a solid cylinder 50.
  • This structure forms a substantially enclosed mechanical resonator.
  • the cylinder Si) is attached to the edges of the discs.
  • An electromechanical filter comprising a base member, a pair of supporting means attached to said 4base member, a first ⁇ supporting disc ⁇ attached to one of said supporting means, a second supporting disc attached to the second supporting means, a plurality of supporting wires attached to the peripheries of said first and second supporting discs and extending between them, a plurality of active discs mounted between the first and second supporting discs and with their peripheries attached to the supporting wires, a drive wire extending through the supporting and active discs, said drive wire firmly attached to said active discs and said drive wire extending through openings formed in said supporting discs and out of engagement therewith.
  • An electromechanical filter comprising a base member, a pair of supporting means attached to said base member, a first supporting disc attached to one of said supporting means, a second supporting disc attached to the second supporting means, a plurality of supporting Wires attached to the peripheries of said first and second supporting discs and extending between them, a plurality of active discs mounted between the first and second supporting discs and with their peripheries attached to the supporting wires, a drive wire extending through the supporting and active discs, said drive wire firmly attached to sai-d active discs, said drive wire extending through openings formed in said supporting discs and out of engagement therewith, a driving winding mounted in the first supporting means, an output winding mounted in the second supporting means, and said drive wire extending thro-ugh the driving and output windings.
  • An electromechanical filter comprising a base member, a pair of supporting means attached to said base member, a pair of biasing magnets attached to said pair of supporting means, a first supporting disc attached to one of said supportin7 means a second supporting disc attached to the second supporting means, a plurality of supporting wires attached to the peripheries of said first and second supporting discs and extending between them, a plurality of active discs mounted between the first land second supporting discs and with their peripheries attaehed to the supporting wires, a drive wire ⁇ of magnetostrictive material extending through the supporting and active discs, said drive wire firmly attached to said active discs and said drive wire extending through openings formed in said supporting discs and out of engagement therewith.
  • An electromechanical filter comprising a base member, a pair of supporting means attached to said base member, a first supporting disc attached to one 4of said ⁇ supporting means, a second supporting disc attached to the second supporting means, a hollow supporting cylinder attached to the peripheries of said first and second supporting discs and extending between them, a plurality of active discs mounted between the first and second supporting discs and with their peripheries attached to the supporting cylinder, a drive wire extending through the centers of the supporting and active discs, said drive wire firmly attached to said active discs and said drive wire extending through openings formed in said supporting discs and out of engagement therewith.
  • An electromechanical filter comprising a base member, a pair of standoffs attached to said base member, a rst supporting disc attached to one of said standoffs, a second supporting disc attached to the second standoff, supporting means attached to the peripheries of said first and ⁇ second supporting discs and extending between them, a plurality of active discs mounted between the first and second supporting discs and with their peripheries attached to the supporting means, a drive wire extending through the centers of the supporting and active discs, said drive wire rmly attached to said active discs, and said drive wire extending through openings formed in said supporting discs and out of engagement therewith.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US469388A 1954-11-17 1954-11-17 Center coupled filter Expired - Lifetime US2808572A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
BE540777D BE540777A (xx) 1954-11-17
NL95629D NL95629C (xx) 1954-11-17
NL199657D NL199657A (xx) 1954-11-17
US469388A US2808572A (en) 1954-11-17 1954-11-17 Center coupled filter
GB23463/55A GB781033A (en) 1954-11-17 1955-08-15 Improvements in electromechanical filters
CH332314D CH332314A (fr) 1954-11-17 1955-09-07 Filtre électromécanique
FR1153858D FR1153858A (fr) 1954-11-17 1955-09-15 Filtre électro-mécanique
DEC11889A DE1116326B (de) 1954-11-17 1955-09-30 Elektromechanisches Filter, bei welchem zu Biegeschwingungen erregte, plattenfoermige Resonatoren vorgesehen sind

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US469388A US2808572A (en) 1954-11-17 1954-11-17 Center coupled filter

Publications (1)

Publication Number Publication Date
US2808572A true US2808572A (en) 1957-10-01

Family

ID=23863596

Family Applications (1)

Application Number Title Priority Date Filing Date
US469388A Expired - Lifetime US2808572A (en) 1954-11-17 1954-11-17 Center coupled filter

Country Status (7)

Country Link
US (1) US2808572A (xx)
BE (1) BE540777A (xx)
CH (1) CH332314A (xx)
DE (1) DE1116326B (xx)
FR (1) FR1153858A (xx)
GB (1) GB781033A (xx)
NL (2) NL95629C (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3135933A (en) * 1962-07-26 1964-06-02 Collins Radio Co M derived mechanical filter
US3238476A (en) * 1960-05-14 1966-03-01 Telefunken Patent Electrostrictive torsional vibrator
US3351875A (en) * 1962-12-20 1967-11-07 Collins Radio Co Ring coupled mechanical filter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1678116A (en) * 1923-10-16 1928-07-24 Western Electric Co Device for the transmission of mechanical vibratory energy
US2501488A (en) * 1946-07-19 1950-03-21 Zenith Radio Corp Magnetostrictively driven mechanical wave filter
US2617882A (en) * 1950-05-29 1952-11-11 Rca Corp Maximal flatness filter
US2693580A (en) * 1953-07-06 1954-11-02 Collins Radio Co Electromechanical filter with center drive of disk

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1666681A (en) * 1924-04-22 1928-04-17 Western Electric Co Mechanical wave filter
US2693579A (en) * 1952-04-21 1954-11-02 Collins Radio Co Longitudinal support of mechanical filter
US2656516A (en) * 1952-08-14 1953-10-20 Collins Radio Co Filter using transverse supporting means

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1678116A (en) * 1923-10-16 1928-07-24 Western Electric Co Device for the transmission of mechanical vibratory energy
US2501488A (en) * 1946-07-19 1950-03-21 Zenith Radio Corp Magnetostrictively driven mechanical wave filter
US2617882A (en) * 1950-05-29 1952-11-11 Rca Corp Maximal flatness filter
US2693580A (en) * 1953-07-06 1954-11-02 Collins Radio Co Electromechanical filter with center drive of disk

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3238476A (en) * 1960-05-14 1966-03-01 Telefunken Patent Electrostrictive torsional vibrator
US3135933A (en) * 1962-07-26 1964-06-02 Collins Radio Co M derived mechanical filter
US3351875A (en) * 1962-12-20 1967-11-07 Collins Radio Co Ring coupled mechanical filter

Also Published As

Publication number Publication date
GB781033A (en) 1957-08-14
BE540777A (xx)
FR1153858A (fr) 1958-03-28
NL95629C (xx)
CH332314A (fr) 1958-08-31
NL199657A (xx)
DE1116326B (de) 1961-11-02

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