US3769613A - Ultrasonic wave delay line - Google Patents

Ultrasonic wave delay line Download PDF

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Publication number
US3769613A
US3769613A US00177420A US3769613DA US3769613A US 3769613 A US3769613 A US 3769613A US 00177420 A US00177420 A US 00177420A US 3769613D A US3769613D A US 3769613DA US 3769613 A US3769613 A US 3769613A
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US
United States
Prior art keywords
percent
delay line
temperature
delay
glass
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
US00177420A
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English (en)
Inventor
M Tsunekawa
Y Nakata
T Inamura
M Ohno
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.)
Nikon Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Nippon Kogaku KK
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.)
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Application filed by Nippon Telegraph and Telephone Corp, Nippon Kogaku KK filed Critical Nippon Telegraph and Telephone Corp
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Publication of US3769613A publication Critical patent/US3769613A/en
Assigned to NIPPON TELEGRAPH & TELEPHONE CORPORATION reassignment NIPPON TELEGRAPH & TELEPHONE CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 07/12/1985 Assignors: NIPPON TELEGRAPH AND TELEPHONE PUBLIC CORPORATION
Assigned to NIKON CORPORATION, 2-3, MARUNOUCHI 3-CHOME, CHIYODA-KU, TOKYO, JAPAN reassignment NIKON CORPORATION, 2-3, MARUNOUCHI 3-CHOME, CHIYODA-KU, TOKYO, JAPAN CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE APR. 1, 1988 Assignors: NIPPON KOGAKU, K.K.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
    • C03C3/105—Glass compositions containing silica with 40% to 90% silica, by weight containing lead containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties
    • C03C4/0057—Compositions for glass with special properties for ultrasonic delay lines glass
    • 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

  • the present invention relates to an ultrasonic wave delay line employing as the delaying medium a glass having a novel composition and excellent characteristics.
  • an ultrasonic wave delay line comprises a medium for transmitting ultrasonic waves therethrough, a transducer disposed upon a suitable portion of the surface of the medium for transducing electrical signals into mechanical ones and another transducer adapted to convert the mechanical signals to electrical ones.
  • the simplest construction of the delay line of the type described comprises an input transducer and an output transducer attached to the respective ends of a medium.
  • the input transducer electrical signals are converted into mechanical signals (shear mode ultrasonic waves) which in turn transmit through the medium and reach the output transducer where the mechanical signals are again converted into the electrical signals.
  • the signals are delayed by the time required for the mechanical signals to pass through the medium. That is, the delay time is defined as the time difference between the input and the output signals.
  • the characteristics of the delay line are dependent upon the delay time, the temperature coefficient of the delay time, and the amount of attenuation of the signals, etc.
  • Various delay mediums having different shapes and being made of various materials have been proposed.
  • the delay mediums are made of quartz, glass, ceramics, metals and the like; and mediums of the multireflection type have been also proposed to provide a compact delay line capable of increasing the delay time.
  • the ultrasonic wave delay lines find many applica tions in the various fields such as television, radar, band width compression, electronic computers and so on.
  • the delay lines are required to have asmaller temperature coefficient-of the delay time and less attenuation of the signals in the delaying medium.
  • the problem has not been so far satisfactorily solved because even the improved glass'material exhibits a temperature coefficient of (l to 5) X 10' C.
  • a precise machining operation is required so that glass is advantageous because of its machinability.
  • quartz has the least attenuation factor among the glasses with a value of 2 X l 0 dB per cycle in measurements above 1 MHz.
  • the attenuation factor is of the order of 10 X 10' to 50 X 10' dB, which is far from the value satisfactorily applied in practice.
  • the primary object of the present invention is to provide an ultrasonic wave delay line having a smaller temperature coefficient of time delay and a smaller signal attenuation factor than heretofore attainable.
  • the temperature T at which the delay time becomes minimum can be varied even in the temperature range slightly deviated from the normal temperature by suitably selecting the composition of the ultrasonic wave transmission medium.
  • the temperature coefficient of delay time of the delay line of the present invention can be made less than 1.5 X 10/ C.
  • the present invention provides an ultrasonic wave delay line incorporating a delaying medium made of a glass having the composition of, by weight, '57 to 78 percent SiO 0.5 to 9 percent Al O 16 to 19 percent PbO; up to 11 percent Na O and upto 20 percent K 0; the combined amounts of Na O and K 0 being from 9 to 20 percent, and having a temperature coefficient of time delay of not more than 5 X l0' C over a wide temperature range centered around room temperature, and an acoustic attenuation factor of less than 10 X 10 dB per cycle about 1 MHz.
  • a desired temperature coefficient of time delay is l X 10/" C to 5 X 10 C.
  • a suitable amount of K 0 is l to 7 weight percent.
  • a suitable amount of Na O is 6 to l 1 weight percent.
  • a desired amount of SiO is 60 to 67 weight percent.
  • the desired amount of PhD is 17 weight percent.
  • the temperature coefficient of time delay' can be controlled by the composition of the glass when it is cooled sufficiently gradually, but generally varies depending upon the temperature range selected.
  • the relation betweenthe time delay 1' and the deviation A1- due to temperature difference can be expressed by where a a constant;
  • the ingredients SiO A1 0 and PhD have the characteristic of shifting T, to the positive side; A1 0 has a great influence in this respect while PbO has a small influence.
  • M1 0 and K 0 have the tendency of shifting T to the negative side.
  • Na O is stronger than K 0. Therefore, by suitably selecting the ratios of these ingredients, the temperature T may be centered in the service temperature range.
  • the delay line is used generally at room temperature so that when (Na O K 0) is in excess of 20 percent by weight, the amount of the remaining ingredients is not sufficient enough to shift the temperature T to the positive side, thereby lowering the temperature T to a temperature far lower than room temperature.
  • (Na O K 0) is less than 9 percent by weight, the temperature T, will be increased far higher than room temperature.
  • a suitable combination of other ingrediems of 57 to 78 percent by weight of SiO l6 to l9 percent by weight of H; and 0.5 to 9 percent by weight of Al O can set the temperature T close to room temperature.
  • less than 10 percent by weight of glass forming oxides or fluorides such as $13 0 or AS 0 may be added as a clarifier.
  • FIG. 1 shows a typical bar-shaped delay line
  • FIG. 2 is a graph illustrating the relation between the rate of change of delay time and temperature of examples of this invention.
  • Table 1 DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Table 1 the compositions (No. l to N0. 9) of the glasses embodying the present invention with the ingredients being within the above described ranges and compositions (No. 10 to No. 12) of ordinary glass (flint glass); and the corresponding temperature coefficients of time delay over the temperature range of 0 to 50 C.
  • A-r/T A T T as described before so that it is preferable to use the glass having a specific temperature T in such a temperature range from T, C to T, C which satifies approximately the relation of 2T T T as is clearly seen from FIG. 2 and Table 2.
  • the service temperature range is from 0 to 50 C; in case of No. 4, from l5 to 65 C; and in case of No. 6, from 30 to 80 C.
  • An ultrasonic delay line comprising a glass delay medium having a temperature coefficient of time delay of not more than 5 X l0 C and an attenuation factor of less than 10 X 10 dB per cycle above 1 MHz, and input and output transducers sealed to the facets on the delay medium, said delay medium consisting essentially of, by weight, 57 78 percent SiO 0.5 to 9 percent A1 0 16 to 19 percent PbO, up to ll percent Na O, and up to 20 percent K 0, the combined amounts of TABLE 1.COMPOSITIONS IN PERCENT BY WEIGHT Glass No 1 2 3 4 5 6 7 8 'J 10 11 12 Composition:
  • the attenuation factors have been measured to be less than 10 X 10 dB per cycle above 1 MHz.
  • glass No. 5 has an attenuation factor of 8 X 10' dB per cycle when measured at a frequency of 5 MHz.
  • Na O and K 0 being 9 to 20 percent.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Glass Compositions (AREA)
US00177420A 1968-04-05 1971-09-02 Ultrasonic wave delay line Expired - Lifetime US3769613A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2212668 1968-04-05

Publications (1)

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US3769613A true US3769613A (en) 1973-10-30

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US (1) US3769613A (enrdf_load_html_response)
FR (1) FR2005676A1 (enrdf_load_html_response)
GB (1) GB1249021A (enrdf_load_html_response)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6709718A (enrdf_load_html_response) * 1967-07-13 1969-01-15
DE2040517C3 (de) * 1969-08-15 1975-06-05 Nippon Kogaku K.K. Glas für Ultraschallverzögerungsleitungen, das gute Temperaturkonstanz (weniger als S ppm/ Grad C), geringe Dämpfung (weniger als 10 mal 10 hoch -3 db/Zyklus bei 5 Mhz) und ausgezeichnete Alterungsbeständigkeit aufweist
NL7018029A (enrdf_load_html_response) * 1969-12-22 1971-06-24

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Publication number Publication date
DE1916658B2 (de) 1972-09-28
GB1249021A (en) 1971-10-06
FR2005676A1 (enrdf_load_html_response) 1969-12-12
DE1916658A1 (de) 1969-10-30

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Legal Events

Date Code Title Description
AS Assignment

Owner name: NIPPON TELEGRAPH & TELEPHONE CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:NIPPON TELEGRAPH AND TELEPHONE PUBLIC CORPORATION;REEL/FRAME:004454/0001

Effective date: 19850718

AS Assignment

Owner name: NIKON CORPORATION, 2-3, MARUNOUCHI 3-CHOME, CHIYOD

Free format text: CHANGE OF NAME;ASSIGNOR:NIPPON KOGAKU, K.K.;REEL/FRAME:004935/0584