US3475704A - Ultrasonic delay devices - Google Patents

Ultrasonic delay devices Download PDF

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Publication number
US3475704A
US3475704A US539191A US3475704DA US3475704A US 3475704 A US3475704 A US 3475704A US 539191 A US539191 A US 539191A US 3475704D A US3475704D A US 3475704DA US 3475704 A US3475704 A US 3475704A
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US
United States
Prior art keywords
sides
ultrasonic
reflected
prism
length
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
US539191A
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English (en)
Inventor
Cornelis Martinus Van De Burgt
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.)
US Philips Corp
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3475704A publication Critical patent/US3475704A/en
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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
    • H03H9/30—Time-delay networks
    • H03H9/36—Time-delay networks with non-adjustable delay time

Definitions

  • Two sides of the device are parallel and a third side is perpendicular thereto.
  • the fourth and fifth sides are arranged at an angle of 45 to the third side and include an input and an output transducer, respectively.
  • the parallel sides are approximately twice the length of the third side so that the ultrasonic waves are reflected twice on each of the parallel sides.
  • the present invention relates to an ultrasonic delay device comprising a prismatic medium having an essentially pentagonal bottom surface.
  • Such delay devices are employed, for example, for delaying video signals which is required in various colour television systems.
  • the ultrasonic vibrations are repeatedly reflected from the sides of the prism so that a prism of comparatively small dimensions can provide an adequately long delay time.
  • the conventional delay devices suffer the disadvantage that the requirements as to the accuracy of the shape of the prism are quite critical in order to guarantee reliable operation of the device.
  • the invention has for its object to provide a device, the delay medium of which allows appreciable tolerances in shape. It can therefore be manufactured at comparatively low cost for example, of pressed glass, while after-treatment is slight or not even required at all.
  • the invention is characterized in that the basic pentagon is formed by two substantially parallel sides, a third side substantially normal thereto, and two sides, provided with the input and output transducers, arranged at an angle of substantially 45 to the third side.
  • the length of the parallel sides are chosen so that the ultrasonic waves are reflected twice on each of the parallel sides.
  • the figure is a plan view of an ultrasonic delay body L made from a conventional medium, for example, glass, particularly pressed glass.
  • the body L has the shape of a rectangular prism with a pentagonal cross section.
  • the pentagon comprises two parallel sides 1 and 2, a third side 3 normal to the sides 1 and 2, and two sides 4 and 5 at an angle of 45 to the side 3.
  • the corners of the pentagon will be slightly rounded ofl.
  • the sides 4 and 5 hold the input and output transducers T and T respectively, which may be made of a piezo-electric material, for example, polarised barium titanate.
  • the lengths of the sides 1 and 2 are chosen so that ultrasonic mechanical vibrations emanating from the transducer T (particularly shear vibrations, the direction of vibration being at right angles not only to the direction of propagation but also to the face of the pentagon) are reflected in order of succession on the side 2, the side 1, the side 3 and again on the side 2 and the side 1 before they strike the transducer T in co-phase.
  • the length of the sides 1 and 2 is preferably twice the length of the side 3. Consequently,
  • a body L of pressed glass which had a velocity of propagation of the shear waves of 2500 m./sec., while the sides 1 and 2 had a length of about 50 mms. and the side 3 was half this length.
  • the delay time was 64 ,uS6C., which is desirable for colour television systems.
  • An ultrasonic delay device comprising a prism of wave transmitting material having an essentially pentagonal face bounded by first and second substantially parallel sides, a third side substantially at right angles to said first and second sides, and fourth and fifth sides each of which form an angle of substantially 45 degrees with respect to said third side, an input transducer coupled to said fourth side for imparting ultrasonic wave energy to said delay device so as to be multiply reflected from the sides thereof, and an output transducer coupled to said fifth side for receiving the incident multiply reflected wave energy, the length of said parallel sides relative to said third side being chosen so that the ultrasonic energy is twice reflected 01f of each of said parallel sides in its travel from the input to the output transducer.
  • a device as described in claim 1 wherein said device comprises a rectangular prism in which said first, second, third, fourth and fifth sides are all substantially at right angles to said pentagonal face.
  • An ultrasonic delay device comprising a prism of ultrasonic wave'transmitting material having a pentagonal face bounded by first "and second substantially parallel sides, a third side substantially perpendicular" to said first and second-sides, andrfourthrand fifth sides each each ar-rangedat an angle of substantially 45 degrees to the third side, an:inputtransducer coupled to said fourth side for transmitting ultrasonic Wave energyto said material, and an output transducer coupled to said fifth side for receiving the Wave energy subsequent to being multiply reflected from'the sides ofsaid prism, the length of'said first and second parallel sides being approximately twice the length of said third side whereby the ultrasonic energy is reflected once of]? of each parallel side as it 4 travels down the prism-and before it strikesthe third side and is reflected once moreotf of each parallel side as it travels back throughthe prism to the output transdueer.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
US539191A 1965-04-17 1966-03-31 Ultrasonic delay devices Expired - Lifetime US3475704A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL656504937A NL143392B (nl) 1965-04-17 1965-04-17 Ultrasone vertragingsinrichting.

Publications (1)

Publication Number Publication Date
US3475704A true US3475704A (en) 1969-10-28

Family

ID=19792967

Family Applications (1)

Application Number Title Priority Date Filing Date
US539191A Expired - Lifetime US3475704A (en) 1965-04-17 1966-03-31 Ultrasonic delay devices

Country Status (12)

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US (1) US3475704A (enrdf_load_html_response)
AT (1) AT261000B (enrdf_load_html_response)
BE (1) BE679636A (enrdf_load_html_response)
CH (1) CH435828A (enrdf_load_html_response)
DE (1) DE1616677B1 (enrdf_load_html_response)
DK (1) DK119835B (enrdf_load_html_response)
ES (1) ES128244Y (enrdf_load_html_response)
FI (1) FI44172B (enrdf_load_html_response)
GB (1) GB1083531A (enrdf_load_html_response)
NL (1) NL143392B (enrdf_load_html_response)
NO (1) NO116769B (enrdf_load_html_response)
SE (1) SE317708B (enrdf_load_html_response)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3615770A (en) * 1966-12-07 1971-10-26 Jenaer Glaswerk Schott & Gen Glass having a low ultrasonic propagation time temperature coefficient
US3654575A (en) * 1968-12-06 1972-04-04 Philips Corp Wave transmission time device
US3723143A (en) * 1968-03-08 1973-03-27 Jenaer Glaswerk Schott & Gen Glass compositions for ultrasonic delayed action lines
US4488128A (en) * 1983-04-22 1984-12-11 Gte Products Corporation Bifurcated electroacoustic delay line with diagonal coupling
EP0087078A3 (de) * 1982-02-23 1985-04-10 Siemens Aktiengesellschaft Ultraschall-Verzögerungsleitung und Verfahren zu seiner Herstellung
EP0087079A3 (de) * 1982-02-23 1985-04-24 Siemens Aktiengesellschaft Ultraschall-Verzögerungsleitung
US4525692A (en) * 1983-04-22 1985-06-25 Gte Products Corporation Electroacoustic delay lines

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307120A (en) * 1962-09-26 1967-02-28 Bell Telephone Labor Inc Ultrasonic wave device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2839731A (en) * 1953-01-14 1958-06-17 Bell Telephone Labor Inc Multi-facet ultrasonic delay line

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307120A (en) * 1962-09-26 1967-02-28 Bell Telephone Labor Inc Ultrasonic wave device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3615770A (en) * 1966-12-07 1971-10-26 Jenaer Glaswerk Schott & Gen Glass having a low ultrasonic propagation time temperature coefficient
US3723143A (en) * 1968-03-08 1973-03-27 Jenaer Glaswerk Schott & Gen Glass compositions for ultrasonic delayed action lines
US3654575A (en) * 1968-12-06 1972-04-04 Philips Corp Wave transmission time device
EP0087078A3 (de) * 1982-02-23 1985-04-10 Siemens Aktiengesellschaft Ultraschall-Verzögerungsleitung und Verfahren zu seiner Herstellung
EP0087079A3 (de) * 1982-02-23 1985-04-24 Siemens Aktiengesellschaft Ultraschall-Verzögerungsleitung
US4488128A (en) * 1983-04-22 1984-12-11 Gte Products Corporation Bifurcated electroacoustic delay line with diagonal coupling
US4525692A (en) * 1983-04-22 1985-06-25 Gte Products Corporation Electroacoustic delay lines

Also Published As

Publication number Publication date
SE317708B (enrdf_load_html_response) 1969-11-24
ES128244U (es) 1967-07-01
GB1083531A (en) 1967-09-13
BE679636A (enrdf_load_html_response) 1966-10-17
DE1616677B1 (de) 1970-10-22
DK119835B (da) 1971-03-01
FI44172B (enrdf_load_html_response) 1971-06-01
NO116769B (enrdf_load_html_response) 1969-05-19
NL143392B (nl) 1974-09-16
AT261000B (de) 1968-04-10
CH435828A (de) 1967-05-15
NL6504937A (enrdf_load_html_response) 1966-10-18
ES128244Y (es) 1967-12-16

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