GB615979A - Improvements in or relating to electrical pick-ups - Google Patents

Improvements in or relating to electrical pick-ups

Info

Publication number
GB615979A
GB615979A GB28720/45A GB2872045A GB615979A GB 615979 A GB615979 A GB 615979A GB 28720/45 A GB28720/45 A GB 28720/45A GB 2872045 A GB2872045 A GB 2872045A GB 615979 A GB615979 A GB 615979A
Authority
GB
United Kingdom
Prior art keywords
bridge
stylus holder
crystal
ups
points
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
Application number
GB28720/45A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB615979A publication Critical patent/GB615979A/en
Priority claimed from FR792055A external-priority patent/FR1343459A/en
Expired legal-status Critical Current

Links

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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
    • C07F9/02—Phosphorus compounds
    • C07F9/547—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom
    • C07F9/6561—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom containing systems of two or more relevant hetero rings condensed among themselves or condensed with a common carbocyclic ring or ring system, with or without other non-condensed hetero rings
    • C07F9/65616—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom containing systems of two or more relevant hetero rings condensed among themselves or condensed with a common carbocyclic ring or ring system, with or without other non-condensed hetero rings containing the ring system having three or more than three double bonds between ring members or between ring members and non-ring members, e.g. purine or analogs
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

615,979. Gramophone pick-ups. HANSEN, H. C. Oct. 30, 1945, No. 28720. Convention date, Jan. 28, 1944. [Class 40 (iv)] In a piezo-electric pick-up, the crystal 20, the stylus holder 12 and the connecting member 18 are mounted on a bridge 22 which is supported against the pressure of a spring 38 at three or more points in the casing. At each point of support, a pivot 26, 28, 30 rests in a V-shaped mounting 32, 34, 36 respectively. In the event of a shock or a sudden increase of the needle pressure, the bridge can turn about an axis joining any two of the points of support. The mounting of the crystal and stylus holder on the bridge is not described. The crystal is gripped by a forked connecting member 18 rigidly secured to the stylus holder. Rubber cushions 24 are provided between the stylus holder and the bridge.
GB28720/45A 1944-01-28 1945-10-30 Improvements in or relating to electrical pick-ups Expired GB615979A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK615979X 1944-01-28
FR792055A FR1343459A (en) 1959-04-14 1959-04-14 Theophylline derivatives and their preparation

Publications (1)

Publication Number Publication Date
GB615979A true GB615979A (en) 1949-01-14

Family

ID=26068263

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28720/45A Expired GB615979A (en) 1944-01-28 1945-10-30 Improvements in or relating to electrical pick-ups

Country Status (2)

Country Link
BE (1) BE460670A (en)
GB (1) GB615979A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780680A (en) * 1952-03-25 1957-02-05 Webster Electric Co Inc Transducer
GB2120446A (en) * 1982-04-08 1983-11-30 Rca Corp Holding apparatus for a disc record signal pickup stylus
US4441176A (en) * 1982-04-08 1984-04-03 Rca Corporation Damping mechanism for a video disc stylus holder
US6242099B1 (en) 1996-11-21 2001-06-05 Merck S.A. Microcapsules made of chitin or of chitin derivatives containing a hydrophobic substance, in particular a sunscreen, and process for the preparation of such microcapsules

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780680A (en) * 1952-03-25 1957-02-05 Webster Electric Co Inc Transducer
GB2120446A (en) * 1982-04-08 1983-11-30 Rca Corp Holding apparatus for a disc record signal pickup stylus
US4441176A (en) * 1982-04-08 1984-04-03 Rca Corporation Damping mechanism for a video disc stylus holder
US6242099B1 (en) 1996-11-21 2001-06-05 Merck S.A. Microcapsules made of chitin or of chitin derivatives containing a hydrophobic substance, in particular a sunscreen, and process for the preparation of such microcapsules

Also Published As

Publication number Publication date
BE460670A (en)

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