US2313129A - Art of mounting piezoelectric crystals - Google Patents

Art of mounting piezoelectric crystals Download PDF

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Publication number
US2313129A
US2313129A US376874A US37687441A US2313129A US 2313129 A US2313129 A US 2313129A US 376874 A US376874 A US 376874A US 37687441 A US37687441 A US 37687441A US 2313129 A US2313129 A US 2313129A
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US
United States
Prior art keywords
crystal
art
piezoelectric crystals
mounting piezoelectric
lanolin
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
US376874A
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English (en)
Inventor
William R Dohan
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.)
RCA Corp
Original Assignee
RCA Corp
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 BE474895D priority Critical patent/BE474895A/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US376874A priority patent/US2313129A/en
Priority to GB12165/41A priority patent/GB551954A/en
Application granted granted Critical
Publication of US2313129A publication Critical patent/US2313129A/en
Priority to FR950240D priority patent/FR950240A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/04—Gramophone pick-ups using a stylus; Recorders using a stylus

Definitions

  • My present invention relates to the art of mounting piezoelectric crystal elements, particularly those constituted of Rochelle salt (sodiumpotassium tartrate) .and has for its principal object to provide improvements in moisture-'proof mounts for such piezoelectric crystal elements.
  • Rochelle salt sodiumpotassium tartrate
  • I may surround, immerse or em'bed a Rochelle salt or similar crystal elementor elements, and preferably the electrodes therefor, in petroleum, or in lanolin, or in a mixture comprising petrolatum and lanolin or other water emulsifying agent, such for example as calcium stearato or aluminum stearate.
  • these moisture-proofing substances or mixtures are applied in the form of a filling to the casing or cartridge in which the crystal assembly is mounted, in which case the crystal and its electrodes are allv preferably immersed in and surrounded by the illling.
  • a Rochelle salt crystal which is mounted and operated in accordance with my invention in petrolatum exhibits a substantially higher factor or merit than one provided with an asphaltic coating.
  • I have achieved very much better results when the embedment material is constituted in whole or in part of lanolin or other emulsifying agent.
  • a Rochelle salt crystal element coated with an asphaltic compound exhibited a useful life of 24 hours, one embedded in petrolatum a useful life of 300 hours, while one embedded in lanolin was apparently unaffected at the expiration of 500 hours.
  • the failure of the first mentioned crystal may have been due to minute voids, inherent in the granular structure of asphaltic coatings, through which moisture seeped 4and destroyed the crystal. 'I'he eventual failure of the crystals which were embedded in petrolatum may be attributed to the factvthat moisture settling on the petrolatum eventually worked inwardly through the mass and was absorbed by .the crystal.
  • lanolin lanum anhydrous U. S. P.
  • this material has a melting point of 31 to 34 C. and has a viscosity such that it serves not only to damp-out resonance peaks. (at temperature of the order of 20 to 25 C.) but also serves to compensate for the usual drop in the crystal output at temperatures above 20 C., by reason of its decreased viscosity at increasing temperatures.
  • lanolin is capable of absorbing up to percent of its weight of water although it is not water soluble. The advantages of my invention, however, may be achieved to a greater or less degree, in the above respects, with any of the aforementioned or equivalent semiliquid or semisolid materials, either alone or in combination.
  • a conventional phonograph pick-up comprising a casing I which encloses a piezoelectric unit comprising a pair of Rochelle salt crystals 3 with which are associated terminal foils B of conductive material in a well known manner, the crystal unit 3 being spaced from the casing I as by the clamps 'l in which it is supported, or otherwise.
  • the casing i also carries a torsion yoke 9 which extends through a suitable bearing i I, and. the outer or free-end of the yoke 9 being provided. with a needle socket I3.
  • the casing is provided with a illling comprising a semisolid or semiliq'uid mass which is preferably constituted of one of the insulating materials or compoundsl above described and within which the crystal unit 3 is adapted to be vibrated as by the force transmitted thereto through the yoke 9. l
  • a piezoelectric unit comprising a. casing containing a piezoelectric crystal element and a semisolid mass of insulating material in which said crystal is embedded, and means extending from said crystal throush said insulating material to the exterior oi said casing for applying an operating force to said crystal.
  • said insulating material comprises a water emulsiiying agent.
  • said insulating material comprises petro- WmusMnDoHAN.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
US376874A 1941-01-31 1941-01-31 Art of mounting piezoelectric crystals Expired - Lifetime US2313129A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE474895D BE474895A (fr) 1941-01-31
US376874A US2313129A (en) 1941-01-31 1941-01-31 Art of mounting piezoelectric crystals
GB12165/41A GB551954A (en) 1941-01-31 1941-09-19 Improvements in or relating to the mounting of piezoelectric crystals
FR950240D FR950240A (fr) 1941-01-31 1947-07-28 Montage de cristaux piézoélectriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US376874A US2313129A (en) 1941-01-31 1941-01-31 Art of mounting piezoelectric crystals

Publications (1)

Publication Number Publication Date
US2313129A true US2313129A (en) 1943-03-09

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ID=23486852

Family Applications (1)

Application Number Title Priority Date Filing Date
US376874A Expired - Lifetime US2313129A (en) 1941-01-31 1941-01-31 Art of mounting piezoelectric crystals

Country Status (4)

Country Link
US (1) US2313129A (fr)
BE (1) BE474895A (fr)
FR (1) FR950240A (fr)
GB (1) GB551954A (fr)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476414A (en) * 1945-05-24 1949-07-19 William H Hutter Phonograph pickup having plastic torsion arm
US2498210A (en) * 1948-11-02 1950-02-21 Avco Mfg Corp Piezoelectric phonograph pickup device
US2510585A (en) * 1945-08-21 1950-06-06 Rca Corp Dynamic galvanometer
US2510342A (en) * 1946-04-03 1950-06-06 Avco Mfg Corp Pickup mounting
US2519185A (en) * 1947-03-21 1950-08-15 Brush Dev Co Phonograph pickup
US2518861A (en) * 1947-03-21 1950-08-15 Brush Dev Co Phonograph pickup
US2539297A (en) * 1947-02-27 1951-01-23 Lazaro Luis Nicolas Gomez De Electric musical instrument
US2562741A (en) * 1947-02-13 1951-07-31 Dictaphone Corp Method of making sealed electromechanical translating devices
US2564054A (en) * 1947-10-10 1951-08-14 Magnavox Co Phonograph pickup and mechanical motion converting system therefor
US2565837A (en) * 1944-05-03 1951-08-28 Ansar Anders Johan Pickup device having a force transmitting carrier link of viscous material
US2594948A (en) * 1947-10-30 1952-04-29 Brush Dev Co Electromechanical transducer unit
US2701280A (en) * 1950-03-02 1955-02-01 Emi Ltd Piezoelectric phonograph pickup
DE1026980B (de) * 1952-03-27 1958-03-27 Electroacustik Ges M B H Piezoelektrischer Tonabnehmer
DE1026979B (de) * 1952-03-13 1958-03-27 Electroacustik Ges M B H Vorrichtung zur Herstellung einer loesbaren Verbindung zwischen einem Tonabnehmer und einem Abtastorgan
US2839695A (en) * 1957-01-31 1958-06-17 Donald H Robey Frequency controllable piezo-electric resonator
US2879413A (en) * 1956-08-21 1959-03-24 Sonotone Corp Phonograph pickups
DE1053802B (de) * 1953-05-28 1959-03-26 Tefi Appbau Dr Daniel K G Verfahren zur Herstellung eines piezoelektrischen Tonabnehmers
DE1150215B (de) * 1958-04-03 1963-06-12 Erie Resistor Corp Tonabnehmer zum Abtasten von stereophonisch und monaural aufgezeichneten Signalen
US3239696A (en) * 1962-06-20 1966-03-08 Garrett Corp Piezoelectric pressure transducer
US3374663A (en) * 1965-04-16 1968-03-26 Electronic Systems Inc Vibration detector
US3465747A (en) * 1964-11-17 1969-09-09 Vernon L Rogallo Ballistocardiograph
US3582692A (en) * 1968-05-01 1971-06-01 U S Research Corp Resiliently supported sensing transducer
US4051396A (en) * 1974-02-28 1977-09-27 Channel Products, Inc. Encapsulation to prevent fracture of piezoelectric high voltage mechanism
WO1984001499A1 (fr) * 1982-10-19 1984-04-26 Ivac Corp Sphygmomanometre electronique
US7622844B1 (en) * 2003-12-30 2009-11-24 Hipercon, Llc Metal fiber brush interface conditioning

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1029173B (de) * 1952-09-15 1958-04-30 Daniel Tefi Apparatebau Piezoelektrischer Tonabnehmer

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565837A (en) * 1944-05-03 1951-08-28 Ansar Anders Johan Pickup device having a force transmitting carrier link of viscous material
US2476414A (en) * 1945-05-24 1949-07-19 William H Hutter Phonograph pickup having plastic torsion arm
US2510585A (en) * 1945-08-21 1950-06-06 Rca Corp Dynamic galvanometer
US2510342A (en) * 1946-04-03 1950-06-06 Avco Mfg Corp Pickup mounting
US2562741A (en) * 1947-02-13 1951-07-31 Dictaphone Corp Method of making sealed electromechanical translating devices
US2539297A (en) * 1947-02-27 1951-01-23 Lazaro Luis Nicolas Gomez De Electric musical instrument
US2519185A (en) * 1947-03-21 1950-08-15 Brush Dev Co Phonograph pickup
US2518861A (en) * 1947-03-21 1950-08-15 Brush Dev Co Phonograph pickup
US2564054A (en) * 1947-10-10 1951-08-14 Magnavox Co Phonograph pickup and mechanical motion converting system therefor
US2594948A (en) * 1947-10-30 1952-04-29 Brush Dev Co Electromechanical transducer unit
US2498210A (en) * 1948-11-02 1950-02-21 Avco Mfg Corp Piezoelectric phonograph pickup device
US2701280A (en) * 1950-03-02 1955-02-01 Emi Ltd Piezoelectric phonograph pickup
DE1026979B (de) * 1952-03-13 1958-03-27 Electroacustik Ges M B H Vorrichtung zur Herstellung einer loesbaren Verbindung zwischen einem Tonabnehmer und einem Abtastorgan
DE1026980B (de) * 1952-03-27 1958-03-27 Electroacustik Ges M B H Piezoelektrischer Tonabnehmer
DE1053802B (de) * 1953-05-28 1959-03-26 Tefi Appbau Dr Daniel K G Verfahren zur Herstellung eines piezoelektrischen Tonabnehmers
US2879413A (en) * 1956-08-21 1959-03-24 Sonotone Corp Phonograph pickups
US2839695A (en) * 1957-01-31 1958-06-17 Donald H Robey Frequency controllable piezo-electric resonator
DE1150215B (de) * 1958-04-03 1963-06-12 Erie Resistor Corp Tonabnehmer zum Abtasten von stereophonisch und monaural aufgezeichneten Signalen
US3239696A (en) * 1962-06-20 1966-03-08 Garrett Corp Piezoelectric pressure transducer
US3465747A (en) * 1964-11-17 1969-09-09 Vernon L Rogallo Ballistocardiograph
US3374663A (en) * 1965-04-16 1968-03-26 Electronic Systems Inc Vibration detector
US3582692A (en) * 1968-05-01 1971-06-01 U S Research Corp Resiliently supported sensing transducer
US4051396A (en) * 1974-02-28 1977-09-27 Channel Products, Inc. Encapsulation to prevent fracture of piezoelectric high voltage mechanism
WO1984001499A1 (fr) * 1982-10-19 1984-04-26 Ivac Corp Sphygmomanometre electronique
US7622844B1 (en) * 2003-12-30 2009-11-24 Hipercon, Llc Metal fiber brush interface conditioning

Also Published As

Publication number Publication date
BE474895A (fr)
GB551954A (en) 1943-03-17
FR950240A (fr) 1949-09-21

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