US2693580A - Electromechanical filter with center drive of disk - Google Patents

Electromechanical filter with center drive of disk Download PDF

Info

Publication number
US2693580A
US2693580A US366168A US36616853A US2693580A US 2693580 A US2693580 A US 2693580A US 366168 A US366168 A US 366168A US 36616853 A US36616853 A US 36616853A US 2693580 A US2693580 A US 2693580A
Authority
US
United States
Prior art keywords
disc
discs
attached
coil
output
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
US366168A
Inventor
Wesley D Peterson
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
Application filed by Collins Radio Co filed Critical Collins Radio Co
Priority to US366168A priority Critical patent/US2693580A/en
Application granted granted Critical
Publication of US2693580A publication Critical patent/US2693580A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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

Definitions

  • This invention relates in general to electromechanical filters and in particular to a filter which is driven at the center of a resonating disc.
  • the present invention relates to an improved method of driving a filter assembly. It is an object, therefore, to provide a new support means for an electromechanical filter.
  • Another object of this invention is to provide an improved driving system for an electromechanical filter.
  • Figure 1 is a top view of the invention with the top cover removed;
  • Figure 2 is a side sectional view taken on line 2--2 of Figure 1;
  • FIG. 3 is an enlarged detailed sectional view of the driving means of this invention.
  • Figure 1 is a view of the filter with the top cover removed and illustrates a base plate upon which are mounted a pair of stand-offs 11 and 12, respectively.
  • the stand-offs 11 and 12 are formed in two parts with lower parts 13 and 14, and top parts 16 and 17, respectively.
  • the lower parts 13 and 14 are attached to the base plate by set screws 18, and the top parts 16 and 17 are attached by set screws 19 to the lower parts.
  • cylinders 21 and 22 are lined with a suitable gasketing material through which cylinders 21 and 22 extend.
  • the cylinders are hollow as shown in Figure 3, and contain therein a magnetic coil form 24.
  • a driving coil 23 is mounted in cylinder 21 and has output leads 26 and 27 which are connected, respectively, to output terminals 28 and 29 that extend through the base plate 10.
  • Polarizing magnets 31 and 32 are supported by the stand-offs 11 and 12' adjacent the cylinders 21 and 22.
  • the cylinders 21 and 22 are made of nonmagnetic material, as for example, brass.
  • the output cylinder 22 contains therein a structure similar to that within cylinder 21 and comprises an output coil that has output leads 33 and 34 which are connected to output terminals 36 and 37 mounted in the base plate 10.
  • the base plate 10 may be attached to a suitable chassis by threaded pins 38 and 39 connected thereto.
  • the vibrating filter assembly comprising a plurality of active discs 41 and a pair of end discs 42 and 43, respectively.
  • the discs 41, 42 and 43 are connected together by longitudinal coupling wires 44.
  • the end discs 42 and 43 are attached to the cylinders 21 and 22.
  • the thickness and diameter of the active discs 41 determine the frequency of operation of the filter.
  • the cylinders 21 and 22 are formed with axial openings in which the coil forms 24 of cylinders supported by said stand-offs, a
  • the coil forms 24 are formed with central axial openings 45.
  • a driving rod 46 extends through the coil form within cylinder 21.
  • the disc 42 is also formed with a central opening through which the driving rod 46 extends.
  • One end 47 of the driving rod 46 is connected to the center of the first active disc 41 by staking or welding.
  • An output rod 48 may be seen in Figure 2 and extends from the last active disc 41 to within the confines of the cylinder 22 wherein the output coil is mounted.
  • the disc 43 is also formed with a central opening through which the rod 48 extends.
  • a cover member 49 is shown in Figure 2 and is generally rectangular in shape and has downwardly extending sides which are attached to the base plate 10.
  • the driving rod 46 and output rod 48 may be attached to the end active discs by staking.
  • Impedance is defined as the ratio of force to velocity.
  • the input signal is supplied to leads 26 and 27 to excite the magnetostrictive rods 46 and 48 which causes them to expand and contract. If the incoming signal has frequency components within the resonant passband of the filter, the first active disc 41 will vibrate, thus, transferring energy through the wires 44 to the last active disc 41, which will in turn couple the energy to the output magnetostrictive wire 48 which will induce an output signal in the output coil connected to the leads 33 and 34.
  • the apparatus is particularly useful as a bandpass filter which might, for example, have a center frequency of 455 kilocycles.
  • the entire structure at this frequency is only about two and one-half inches long and has an extremely high Q which is unobtainable with electrical filters of comparable size.
  • An electromechanical filter comprising, a base plate, a pair of stand-oils mounted on said base plate, a pair of cylinders supported by said stand-oils, a driving coil mounted within the first cylinder, an output coil mounted within the second cylinder, a plurality of longitudinal coupling wires, a pair of end discs connected, respectively, to the ends of the cylinders, said coupling wires attached to the peripheries of said end discs, a plurality of active discs attached to said coupling wires between said end discs, said end discs formed with a central opening, a driving rod passing through the hole in the first end disc and within the confines of said driving coil and attached to the center of the first active disc, an output rod attached to the center of the last active disc and passing through the hole in the second end disc and within the confines of the output coil, and a pair of polarizing magnets supported by said stand-offs adjacent said cylinders.
  • An electromechanical filter comprising,
  • a base plate a pair of stand-offs mounted on said base plate, a pair driving coil within the first cylinder, an output coil within the sec- 0nd cylinder, a first end disc connected to the end of the first cylinder, a second end disc connected to one end of the second cylinder, a plurality of longitudinal coupling wires attached to the peripheries of the first and second end discs, a plurality of active discs attached to the coupling wire and mounted between the first and second end discs, the first and second end discs formed with a central opening, a driving rod attached to the center of the first active disc and extending through the opening in the first end disc and Within the confines of the driving coil, and an output rod attached to the center of the last disc and extending through the opening in the second end disc and within the confines of the output coil.
  • An electromechanical filter comprising, a base plate,
  • a pair of stand-offs mounted on said base plate, a pair of cylinders supported by said stand-ofls, a driving coil within the first cylinder, an output coil within the second cylinder, a first end disc connected to the end of the first cylinder, a second end disc connected to one end of the second cylinder, a plurality of longitudinal coupling wires attached to the peripheries of the first and second end discs, a plurality of active discs attached to the coupling wire and mounted between the first and second end discs, the first and second end discs formed with a central opening, a driving rod attached to the center of the first active disc and extending through the opening in the first end disc and within the confines of the driving coil, an output rod attached to the center of the last disc and extending through the opening in the second end disc and within the confines of the output coil, a pair of coil forms mounted, respectively, within the first and second cylinders, and said first and second coils wound, respectively, about them.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Description

Nov. 2, 1954 w. D. PETERSON 2,693,580
ELECTROMECHANICAL FILTER WITH CENTER DRIVE OF DISK Filed July 6, 1953 -1 26 29 21 22 a7 27 /42 45\ 34 3a i 39 2 26 33 2a 36 g 7 I "15 .3 b 19 IN V EN TOR. ".432 [r Z7. Fizz/95o Ariana/[r United States Patent Ofifice 2,693,580 Patented Nov. 2, 1954 ELECTROMECHANICAL FILTER WITH CENTER DRIVE F DISK Wesley D. Peterson, Burbank, Califi, assignor to Collins Radio Company, Cedar Rapids, Iowa, a corporation of Iowa Application July 6, 1953, Serial No. 366,168
3 Claims. (Cl. 333-71) This invention relates in general to electromechanical filters and in particular to a filter which is driven at the center of a resonating disc.
The co-pending patent application entitled Longitudinal Support of Mechanical Filter, Serial Number 283,340, filed April 21, 1952, discloses an electromechanical filter wherein a plurality of discs are supported by longitudinal coupling wires andthe active discs are driven by connecting a magnetostrictive rod to the periphery.
The present invention relates to an improved method of driving a filter assembly. It is an object, therefore, to provide a new support means for an electromechanical filter.
Another object of this invention is to provide an improved driving system for an electromechanical filter.
Further objects, features and advantages of the invention will become apparent from the following description and claims when read in view of the drawings, in which:
Figure 1 is a top view of the invention with the top cover removed;
Figure 2 is a side sectional view taken on line 2--2 of Figure 1; and
Figure 3 is an enlarged detailed sectional view of the driving means of this invention.
Figure 1 is a view of the filter with the top cover removed and illustrates a base plate upon which are mounted a pair of stand- offs 11 and 12, respectively. As best shown in Figure 2, the stand- offs 11 and 12 are formed in two parts with lower parts 13 and 14, and top parts 16 and 17, respectively. The lower parts 13 and 14 are attached to the base plate by set screws 18, and the top parts 16 and 17 are attached by set screws 19 to the lower parts.
At the junction between the upper and lower parts of the stand-offs circular openings are formed. They are lined with a suitable gasketing material through which cylinders 21 and 22 extend. The cylinders are hollow as shown in Figure 3, and contain therein a magnetic coil form 24. A driving coil 23 is mounted in cylinder 21 and has output leads 26 and 27 which are connected, respectively, to output terminals 28 and 29 that extend through the base plate 10. Polarizing magnets 31 and 32 are supported by the stand-offs 11 and 12' adjacent the cylinders 21 and 22. The cylinders 21 and 22 are made of nonmagnetic material, as for example, brass.
The output cylinder 22 contains therein a structure similar to that within cylinder 21 and comprises an output coil that has output leads 33 and 34 which are connected to output terminals 36 and 37 mounted in the base plate 10. The base plate 10 may be attached to a suitable chassis by threaded pins 38 and 39 connected thereto.
Mounted between the cylinders 21 and 22 is the vibrating filter assembly comprising a plurality of active discs 41 and a pair of end discs 42 and 43, respectively. The discs 41, 42 and 43 are connected together by longitudinal coupling wires 44. The end discs 42 and 43 are attached to the cylinders 21 and 22.
As pointed out in the Doelz application, Serial Number 248,011, filed September 24, 1951, the thickness and diameter of the active discs 41 determine the frequency of operation of the filter.
As shown in Figure 3, the cylinders 21 and 22 are formed with axial openings in which the coil forms 24 of cylinders supported by said stand-offs, a
are received. The coil forms 24 are formed with central axial openings 45. A driving rod 46 extends through the coil form within cylinder 21. The disc 42 is also formed with a central opening through which the driving rod 46 extends. One end 47 of the driving rod 46 is connected to the center of the first active disc 41 by staking or welding.
An output rod 48 may be seen in Figure 2 and extends from the last active disc 41 to within the confines of the cylinder 22 wherein the output coil is mounted. The disc 43 is also formed with a central opening through which the rod 48 extends.
A cover member 49 is shown in Figure 2 and is generally rectangular in shape and has downwardly extending sides which are attached to the base plate 10.
The driving rod 46 and output rod 48 may be attached to the end active discs by staking.
Due to the symmetry of the driving points, spurious frequency responses are eliminated. The impedance at the center of the disc is very low so that the filter is driven at a low impedance point. Impedance is defined as the ratio of force to velocity.
In operation, the input signal is supplied to leads 26 and 27 to excite the magnetostrictive rods 46 and 48 which causes them to expand and contract. If the incoming signal has frequency components within the resonant passband of the filter, the first active disc 41 will vibrate, thus, transferring energy through the wires 44 to the last active disc 41, which will in turn couple the energy to the output magnetostrictive wire 48 which will induce an output signal in the output coil connected to the leads 33 and 34.
The apparatus is particularly useful as a bandpass filter which might, for example, have a center frequency of 455 kilocycles. The entire structure at this frequency is only about two and one-half inches long and has an extremely high Q which is unobtainable with electrical filters of comparable size.
Although this invention has been described with respect to a preferred embodiment thereof, it is not to be so limited as changes and modifications may be made therein which are within the full intended scope of the invention, as defined by the appended claims.
What is claimed is:
1. An electromechanical filter comprising, a base plate, a pair of stand-oils mounted on said base plate, a pair of cylinders supported by said stand-oils, a driving coil mounted within the first cylinder, an output coil mounted within the second cylinder, a plurality of longitudinal coupling wires, a pair of end discs connected, respectively, to the ends of the cylinders, said coupling wires attached to the peripheries of said end discs, a plurality of active discs attached to said coupling wires between said end discs, said end discs formed with a central opening, a driving rod passing through the hole in the first end disc and within the confines of said driving coil and attached to the center of the first active disc, an output rod attached to the center of the last active disc and passing through the hole in the second end disc and within the confines of the output coil, and a pair of polarizing magnets supported by said stand-offs adjacent said cylinders.
2. An electromechanical filter comprising,
a base plate, a pair of stand-offs mounted on said base plate, a pair driving coil within the first cylinder, an output coil within the sec- 0nd cylinder, a first end disc connected to the end of the first cylinder, a second end disc connected to one end of the second cylinder, a plurality of longitudinal coupling wires attached to the peripheries of the first and second end discs, a plurality of active discs attached to the coupling wire and mounted between the first and second end discs, the first and second end discs formed with a central opening, a driving rod attached to the center of the first active disc and extending through the opening in the first end disc and Within the confines of the driving coil, and an output rod attached to the center of the last disc and extending through the opening in the second end disc and within the confines of the output coil.
3. An electromechanical filter comprising, a base plate,
a pair of stand-offs mounted on said base plate, a pair of cylinders supported by said stand-ofls, a driving coil within the first cylinder, an output coil within the second cylinder, a first end disc connected to the end of the first cylinder, a second end disc connected to one end of the second cylinder, a plurality of longitudinal coupling wires attached to the peripheries of the first and second end discs, a plurality of active discs attached to the coupling wire and mounted between the first and second end discs, the first and second end discs formed with a central opening, a driving rod attached to the center of the first active disc and extending through the opening in the first end disc and within the confines of the driving coil, an output rod attached to the center of the last disc and extending through the opening in the second end disc and within the confines of the output coil, a pair of coil forms mounted, respectively, within the first and second cylinders, and said first and second coils wound, respectively, about them.
No references cited.
US366168A 1953-07-06 1953-07-06 Electromechanical filter with center drive of disk Expired - Lifetime US2693580A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US366168A US2693580A (en) 1953-07-06 1953-07-06 Electromechanical filter with center drive of disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US366168A US2693580A (en) 1953-07-06 1953-07-06 Electromechanical filter with center drive of disk

Publications (1)

Publication Number Publication Date
US2693580A true US2693580A (en) 1954-11-02

Family

ID=23441928

Family Applications (1)

Application Number Title Priority Date Filing Date
US366168A Expired - Lifetime US2693580A (en) 1953-07-06 1953-07-06 Electromechanical filter with center drive of disk

Country Status (1)

Country Link
US (1) US2693580A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2808572A (en) * 1954-11-17 1957-10-01 Collins Radio Co Center coupled filter
US2829350A (en) * 1955-08-16 1958-04-01 Collins Radio Co Mechanical filter with coupling wires
US2935706A (en) * 1955-06-15 1960-05-03 Rca Corp Electromechanical filter assemblage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2808572A (en) * 1954-11-17 1957-10-01 Collins Radio Co Center coupled filter
DE1116326B (en) * 1954-11-17 1961-11-02 Collins Radio Co Electromechanical filter in which plate-shaped resonators are provided which are excited to flexural vibrations
US2935706A (en) * 1955-06-15 1960-05-03 Rca Corp Electromechanical filter assemblage
US2829350A (en) * 1955-08-16 1958-04-01 Collins Radio Co Mechanical filter with coupling wires

Similar Documents

Publication Publication Date Title
US2249835A (en) Magnetostrictive vibrator
US2501488A (en) Magnetostrictively driven mechanical wave filter
US2435487A (en) Electromechanical vibrator
US2615981A (en) Electromechanical filter
US2662217A (en) Multiple-neck filter
US2998535A (en) Composite electro-acoustic transducer configuration
US2716887A (en) Apparatus for measuring the resonant frequency of a vibratory element
US2814785A (en) Electromechanical filter
US3024429A (en) Electromechanical reed system
US2656516A (en) Filter using transverse supporting means
US2696590A (en) Magnetostrictive filter device
US2693580A (en) Electromechanical filter with center drive of disk
US2709243A (en) Drive system for mechanical filter
US2802992A (en) Elimination of spurious response in an electromechanical filter
US2939971A (en) Mechanical vibratory unit
US2738467A (en) Mechanical resonator coupling utilizing poisson's effect
US2906971A (en) Torsional vibrational wave filters and delay lines
US3044028A (en) Magnetic circuit element transducer
US2091250A (en) Wave filter
US2693579A (en) Longitudinal support of mechanical filter
US2829350A (en) Mechanical filter with coupling wires
US2918634A (en) Increase of coupling to mechanical filter end discs to improve response
US2647948A (en) Electromechanical filter
US2930006A (en) Mechanical filter with impedance matching discs
US2667621A (en) Torsional filter