US3593213A - Ultrasonic delay line and method of manufacturing an ultrasonic delay line - Google Patents

Ultrasonic delay line and method of manufacturing an ultrasonic delay line Download PDF

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Publication number
US3593213A
US3593213A US688482A US3593213DA US3593213A US 3593213 A US3593213 A US 3593213A US 688482 A US688482 A US 688482A US 3593213D A US3593213D A US 3593213DA US 3593213 A US3593213 A US 3593213A
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United States
Prior art keywords
delay line
ultrasonic
parallel
glass
transducers
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Expired - Lifetime
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US688482A
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English (en)
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Cornelis Franx
Manfred Franz Karl Gammel
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US Philips Corp
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US Philips Corp
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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 devices; Electromechanical resonators
    • H03H9/30—Time-delay networks
    • H03H9/36—Time-delay networks with non-adjustable delay time
    • 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

Definitions

  • Trifari ABSTRACT An ultrasonic delay line comprising a glass body having first and second surfaces on which an input transducer and an output transducer are mounted. A third surface of the body perpendicular to the first two reflects energy towards a fourth parallel surface opposite thereto and fluted to damp the energy received, The transducers are polarized parallel to their respective contact surfaces and parallel to the third surface.
  • the main energy propagation path in the body is parallel to the third surface KPATENTEUJULUIQH 3593213 INVENTORS CORNEIJS FRANX FRED F, K .GAMMEL ULTRASONIC DELAY LINE AND METHOD OF MANUFACTURING AN ULTRASONIC DELAY LINE two further surfaces which damp and/or disperse the ul- 0 trasonic vibrations.
  • ultrasonic delay lines with a damping material on those surfaces or portions of surfaces where a reflection of ultrasonic vibrations. for example, ultrasonic scattered radiation, must be prevented.
  • said surface may be roughened, for example, by sand blasting, by grinding grooves therein or by forming grooves therein simultaneously with a moulding operation.
  • the invention is also applicable to a method of manufacturing an ultrasonic delay line, starting from a glass body two surfaces of which are surface-ground and provided with an input and an output transducer.
  • considerable manufacturing cost is previously spent prior to being able to start with the finishing operation, for example, regrinding one of the reflection surfaces for the ultrasonic vibrations so as to obtain the desired delay time between the electric signal applied to the input transducer and that generated at the output transducer.
  • the invention is characterized in that the body is divided into portions, preferably by a cutting operation, substantially parallel to the direction of propagation of the ultrasonic vibrations and parallel to the two further surfaces referred to in the first paragraph and perpendicular to the surfaces for said transducers referred to in the third paragraph.
  • an ultrasonic delay line using a glass body two surfaces of which are provided with piezoelectric input and output transducers polarized parallel to their contact surfaces with the glass body at least one (third) surface of the glass body is parallel to the principal direction of propagation of the ultrasonic vibrations which propagate from the input transducer through the glass body to the output transducer.
  • the delay line is characterized in that the dimension of the body perpendicular to the last-mentioned (third) surface is smaller than the dimensions of this third surface, that the directions of polarization of the transducers are also chosen to be parallel to this third surface, and that the surface of the glass body opposite this third surface reflecting the ultrasonic scattered radiation is formed as a damping and/or dispersing surface for this scattered radiation.
  • the invention is based on the recognition of the fact that said cut surface acts as a mirror for the ultrasonic waves with the result that the body behaves as if it were twice as thick (measured perpendicularly to this surface) and hence the damping for the desired signal is reduced.
  • the undesired scattered radiation of the ultrasonic waves will be able to strike a damping and/or dispersing surface of the delay body in time, that is to say, before it strikes the output transducer, and as a result be rendered harmless.
  • a further advantage is that said cut surface generally requires no further finishing treatments.
  • FIG. 1 shows an ultrasonic delay line in which the principle of the invention has not yet been realized
  • FIG. 2 serves to illustrate the step according to the invention
  • FIG. 3a shows the step according to the invention applied to a delay line of the type shown in FIG. 3b, before the cutting operation
  • FIG. 4a likewise shows the step according to the invention applied to the delay line of the type of FIG. 4b, delay body before the cutting operation.
  • FIG. 1 shows a glass body G having two flat surfaces 1 and 2, for carrying an input transducer r, and an output transducer t, respectively.
  • the material chosen for the glass is preferably of a composition which, under the given conditions, leads to a constant delay time between electric input vibrations applied to the transducer 1, and electric output vibrations generated by the transducer as a result thereof.
  • the glass body G is obtained by placing the molten glass material in a mold having rough surfaces, cooling same to form the rough body, grinding a pair of surfaces 1 and 2 in a proper manner for mounting thereon the input and output transducers t, and I respectively.
  • the transducers t, and l are preferably manufactured from a thin plate of some piezoelectric material, for example, a lead or an alkaline-earth titanate-zirconate or the like.
  • the largest or main surfaces of the plate are provided with electrodes for supplying and deriving the electric signal oscillations.
  • the ultrasonic vibrations generated by the transducer will propagate mainly perpendicular to the surface 1 towards the transducer t, Due to the finite dimensions of this transducer as well as to irregularities both in the material of the transducer and in the glass of the body G, the ultrasonic wave emerging from the transducer 1 will, however, also include rays deviating from the principal direction of propagation.
  • Surfaces 3 and 4 of the glass body G show a fluting which may be obtained, for example, during moulding of the glass by using a mold in which the substantially parallel rough surfaces corresponding to surfaces 3 and 4 are provided with corresponding protuberances, as a result of which the ultrasonic scattered vibrations striking it are further dispersed and clamped in such manner that these scattered vibrations do not substantially contribute to the ultrasonic waves striking the output transducer 1,.
  • the step according to the invention consists in that the body G is bisected along a plane perpendicular to the plane of the drawing and passing through the line 5.
  • the result is that two ultrasonic delay lines G, and G, are produced as shown in FIG. 2. From the ray paths of the ultrasonic vibrations indicated by arrows in FIGS. 1 and 1, it appears that the dispersal and absorption of said undesired scattered radiation has remained unchanged because the surface of division 5 acts as a mirror and therefore reflects the scattered radiation to the fluted surface 3 where it is dispersed in a chaotic manner and undergoes so much damping that only a small portion reaches the transducer r,.
  • transducers r, and t are polarized not only parallel to the contact surfaces 1 and 2 of the glass body G but also parallel to the surface 5 and hence perpendicular to the plane of the drawing.
  • transducer materials as described above remancnt polarization may be brought about in the material by exposing it for some time to a strong electric field, preferably at a high temperature.
  • the dimensions of the body G in this direction, thus perpendicular to the plane of the drawing, are considerably larger than the largest distance between the surfaces 3 and for passing a sufficiently wide bandwidth.
  • FIG. 3b shows a rod-shaped glass body I the long surfaces of which are provided throughout with flutes which may be obtained, for example, by means of a moulding operation.
  • the glass may be moulded in a mould the walls of which have the corresponding fluted structure.
  • the hot glass may also be drawn in the shape of a rod and passed between rollers which are provided with such flutes as to lead to the desired grooves or flutes on these long surfaces.
  • the transducers r, and I may also be previously arranged with the direction of polarization of said transducers being chosen in the direction P parallel to the contact surfaces 1 and 2, respec tively.
  • FIG. 4 shows a glass body the sectional surface of which corresponds to that described in the prior US. Pat. application Ser. No. 539,l9l filed Mar. 31, i966.
  • the fiat surfaces ll and t2 carry the input and output transducers r, and t,, respectively, and form angles of approximately 45 with a flat end surface 13 which is substantially perpendicular to two flat end surface 13 which is substantially perpendicular to two flat side surfaces 14 and I5, respectively. the lengths of which are chosen to be such that a reflection of the ultrasonic vibrations occurs only twice at these side surfaces.
  • the glass body may also have the shape as described in the prior US. Pat. application Ser. No. 618,!59, filed Feb. 23, 1967.
  • the angle formed between the surfaces 11 and i2 is considerably larger. namely almost 180', no special requirements being imposed on the surfaces 14 and 15.
  • the various surfaces important for the ultrasonic propagation the method as described in the last mentioned prior patent application may be adopted.
  • the transducers r, and r are once again polarized, not only parallel to the contact surfaces 1] and 12 but also parallel to the surface of division 5, as is indicated by the arrows P.
  • transducers I, and t directly engage the cut surface 5. This is already automatically achieved by previously arranging these transducers on the glass body G, for example, according to a method described in one of the above prior applications and then sawing them simultaneously with the glass body 0.
  • the surfaces of the transducers r, and t are then preferably considerably smaller than those of the contact surfaces l and 2 and ll and 12, respectively. with the glass body, so that after sawing the transducers r, and I, still remain separated at a considerable distance from the damping surfaces 3 (see FIG. 2) and 16 and 17, respectively (see FIGS. 4a and 4b).
  • a method of manufacturing an ultrasonic delay line comprising the steps of forming a glass body having two surfaces for carrying an input and an output transducer and at least two further surfaces adapted to damp and/or disperse the ultrasonic vibrations, and cutting through the body substantially parallel to the desired direction of propagation of the ultrasonic vibrations and parallel to said two further surfaces.
  • a method of manufacturing an ultrasonic delay line starting from a glass body two surfaces of which are surfaceground and provided with an input and an output transducer, characterized in that the body is divided into portions, preferably sawn, substantially parallel to the direction of propagation of the ultrasonic vibrations and perpendicular to the surface of said transducers.
  • a method of manufacturing an ultrasonic delay line comprising the steps of placing molten glass material in a mold having at least two substantially parallel surfaces provided with protuberances, cooling said glass so that a rough glass body showing two substantially parallel surfaces provided with a fluting corresponding to said protuberances is formed, grinding two other surfaces of said rough glass body substantially perpendicular to said first mentioned two surfaces, securing an input and an output transducer respectively on said two other surfaces, grinding at least one further surface of said glass body substantially perpendicular to said first mentioned two surfaces to reflect ultrasonic rays emerging from said input transducer to strike upon said output transducer, and bisecting said glass body according to a plane substantially parallel to said first mentioned two surfacesv 4.
  • An ultrasonic delay line comprising a glass body having two surfaces which are provided with piezo-electric input and output transducers polarized parallel to their contact surfaces wit the glass body, and at least one third reflecting surface which is parallel to the principal direction of propagation of the ultrasonic vibrations which propagate from the input transducer through the glass body to the output transducer, characterized in that the dimension of the body perpendicular to the last-mentioned third surface is smaller than the dimensions of this third surface, that the directions of polarization of the transducers are also chosen to be parallel to this third surface, and that the surface of the glass body opposite this third surface reflecting the ultrasonic scattered radiation is formed as a damping and/or dispersing surface for this scattered radiation.
  • An ultrasonic delay line as claimed in claim 4 characterized in that it is manufactured of moulded glass.
  • An ultrasonic delay line comprising a solid ultrasonic wavetransmitting body having first and second surfaces, an input transducer and an output transducer in contact with said first and second surfaces, respectively, for propagating ultrasonic vibrations from the input transducer through the solid body to the output transducer along a main propagation path, said body having a third ultrasonic energy reflecting surface parallel to said main propagation path and a fourth surface opposite said third surface and formed as an energy damping sur face for the scattered ultrasonic radiation reflected from the third surface, the dimension of the solid body perpendicular to the third surface being smaller than the dimensions of said third surface, and wherein said transducers are polarized parallel to their respective contact surfaces with the solid body and parallel to the third surface of the solid body.
  • a delay line is claimed in claim 7 wherein said third surface is arranged to reflect substantially all of the energy impinging thereon and said body dimensions are chosen so that the distance between the third and fourth surfaces is less than the width dimension of the third surface, whereby the delay line exhibits a wide bandwidth

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Motor Or Generator Current Collectors (AREA)
US688482A 1966-12-28 1967-12-06 Ultrasonic delay line and method of manufacturing an ultrasonic delay line Expired - Lifetime US3593213A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL666618228A NL154076B (nl) 1966-12-28 1966-12-28 Werkwijzen voor het vervaardigen van een ultrasone vertragingslijn, alsmede ultrasone vertraginslijnen vervaardigd volgens die werkwijzen.

Publications (1)

Publication Number Publication Date
US3593213A true US3593213A (en) 1971-07-13

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US688482A Expired - Lifetime US3593213A (en) 1966-12-28 1967-12-06 Ultrasonic delay line and method of manufacturing an ultrasonic delay line

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US (1) US3593213A (ru)
AT (1) AT278090B (ru)
BE (1) BE708570A (ru)
CH (1) CH474192A (ru)
DE (1) DE1541957B1 (ru)
DK (1) DK127487B (ru)
ES (1) ES348638A1 (ru)
FR (1) FR1549067A (ru)
GB (1) GB1209760A (ru)
LU (1) LU55164A1 (ru)
NL (1) NL154076B (ru)
NO (1) NO121226B (ru)
SE (1) SE339768B (ru)
SU (1) SU404294A3 (ru)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680008A (en) * 1969-12-06 1972-07-25 Victor Company Of Japan Ultrasonic wave delay device having a trap zone for undesired signal components
JPS492239U (ru) * 1972-04-07 1974-01-10
US5404065A (en) * 1992-10-28 1995-04-04 Nikon Corporation Ultrasonic actuator
US6362561B1 (en) * 1999-03-18 2002-03-26 Murata Manufacturing Co., Ltd Piezoelectric vibration device and piezoelectric resonance component

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2261654B1 (ru) * 1974-02-15 1978-01-06 Thomson Csf
JPS51105252A (en) * 1975-03-13 1976-09-17 Asahi Glass Co Ltd Choonpakotaichensen oyobi sonoseizoho
DE2657606C2 (de) * 1976-12-18 1985-01-24 ANT Nachrichtentechnik GmbH, 7150 Backnang Mechanisches Filter, das stabförmige Resonatoren und Wandler aufweist
GB8422282D0 (en) * 1984-09-04 1984-10-10 Atomic Energy Authority Uk Lamb wave guide

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505515A (en) * 1946-04-02 1950-04-25 Us Sec War Compressional wave delay means
US2672590A (en) * 1950-03-22 1954-03-16 Bell Telephone Labor Inc Delay line
US2965851A (en) * 1957-12-26 1960-12-20 Bell Telephone Labor Inc Tapped ultrasonic delay line
US3070761A (en) * 1953-05-07 1962-12-25 Smith & Sons Ltd S Ultrasonic delay lines
US3133258A (en) * 1960-10-21 1964-05-12 Bell Telephone Labor Inc Ultrasonic strip delay line
US3150275A (en) * 1959-07-17 1964-09-22 Corning Glass Works Sectional transducer
US3300739A (en) * 1962-08-03 1967-01-24 Marconi Co Ltd Frequency-dispersive electro-mechanical delay cell utilizing grating
US3488607A (en) * 1967-05-04 1970-01-06 Hughes Aircraft Co Ultrasonic dispersive delay line

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2781494A (en) * 1953-03-18 1957-02-12 Lab For Electronics Inc Ultrasonic delay lines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505515A (en) * 1946-04-02 1950-04-25 Us Sec War Compressional wave delay means
US2672590A (en) * 1950-03-22 1954-03-16 Bell Telephone Labor Inc Delay line
US3070761A (en) * 1953-05-07 1962-12-25 Smith & Sons Ltd S Ultrasonic delay lines
US2965851A (en) * 1957-12-26 1960-12-20 Bell Telephone Labor Inc Tapped ultrasonic delay line
US3150275A (en) * 1959-07-17 1964-09-22 Corning Glass Works Sectional transducer
US3133258A (en) * 1960-10-21 1964-05-12 Bell Telephone Labor Inc Ultrasonic strip delay line
US3300739A (en) * 1962-08-03 1967-01-24 Marconi Co Ltd Frequency-dispersive electro-mechanical delay cell utilizing grating
US3488607A (en) * 1967-05-04 1970-01-06 Hughes Aircraft Co Ultrasonic dispersive delay line

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680008A (en) * 1969-12-06 1972-07-25 Victor Company Of Japan Ultrasonic wave delay device having a trap zone for undesired signal components
JPS492239U (ru) * 1972-04-07 1974-01-10
JPS5421963Y2 (ru) * 1972-04-07 1979-08-02
US5404065A (en) * 1992-10-28 1995-04-04 Nikon Corporation Ultrasonic actuator
US6362561B1 (en) * 1999-03-18 2002-03-26 Murata Manufacturing Co., Ltd Piezoelectric vibration device and piezoelectric resonance component

Also Published As

Publication number Publication date
NL154076B (nl) 1977-07-15
AT278090B (de) 1970-01-26
ES348638A1 (es) 1969-03-16
GB1209760A (en) 1970-10-21
BE708570A (ru) 1968-06-27
NL6618228A (ru) 1968-07-01
DE1541957B1 (de) 1971-07-15
SU404294A3 (ru) 1973-10-26
SE339768B (ru) 1971-10-18
LU55164A1 (ru) 1967-12-27
NO121226B (ru) 1971-02-01
DK127487B (da) 1973-11-12
CH474192A (de) 1969-06-15
FR1549067A (ru) 1968-12-06

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