US3813101A - Pickup needle - Google Patents

Pickup needle Download PDF

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Publication number
US3813101A
US3813101A US00249687A US24968772A US3813101A US 3813101 A US3813101 A US 3813101A US 00249687 A US00249687 A US 00249687A US 24968772 A US24968772 A US 24968772A US 3813101 A US3813101 A US 3813101A
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US
United States
Prior art keywords
shaft
pickup
needle
pickup needle
tip
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
US00249687A
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English (en)
Inventor
E Benz
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Individual
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Individual
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Filing date
Publication date
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Publication of US3813101A publication Critical patent/US3813101A/en
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/44—Styli, e.g. sapphire, diamond
    • G11B3/46—Constructions or forms ; Dispositions or mountings, e.g. attachment of point to shank

Definitions

  • the present invention relates to a new and improved pickup needle having a diamond tip soldered by means of a hard solder to a shaft.
  • the tip is formed of diamond, since this material offers suffi cient wear resistance in order to be able to ensure satisfactory sound pickup over a longer period of time, and therefore playback at microgrooved-long playing records, especially stereo records.
  • needles of this type are those where the shaft is formedof metal, for instance, aluminum, steel -or molybdenum.
  • Such type pickup needles have been disclosed, for instance, in the following publications: German patent publication 1,552,160, Swiss patent 377,119, British patent 836,768, Dutch patent application 6l/268,734, Dutch patent, 101,167 and U.S. Pat. Nos. 2,961,750, 2,570,248 and 2,960,759.
  • the diamond tip is flanged-in or soldered.
  • One of the drawbacks of such needles is theirrelatively great 'weight which is essentially ascribed .tothe shaft.
  • the specific weight of such needles is in the order of magnitude of approximately 7.9 gmslcm tsteel) and l 1.0 gms/cm (molybdenum). Even if the dimensions of the needles are verysmall their weight hasa measurable influence upon theinertia of the sound pickupsystem, which is noticeable during pickup of-high frequencies in the region beginning approximately at l2-kHz.
  • German patent publication l,l80, l 56 pickup needles ground of one-piece from diamond While such possess a low specific weight of 3.4 gms/cm they are however extremely expensive as concerns the raw material and machining.
  • Yet afurther significant object of the present invention relates to an improved construction of pickup needle having a diamond tip and a shaft formed of a material which imparts increased lightweight characteristics to the needle while improving upon the sound pickup characteristics thereof, especially at high frequencies.
  • the proposed pickup needle of this development is manifested by the features that the shaft is formed of a material selected from silicon carbide, boron carbide, corundum, quartz and glass having a melting point exceeding 800C.
  • the shaft material monocrystalline corundum, for instance ruby or sapphire, preferably synthetic colorless sapphire.
  • This material possesses increased hardness and mechanical as well as chemical resistance and is extremely' well suited for subsequent mounting of the needle at the needle support.
  • shaft material is glass, having a meltingpoint exceeding 800C., that is, SiO and A1 0 containing glass.
  • glass having a meltingpoint exceeding 800C., that is, SiO and A1 0 containing glass.
  • shaft material is quartz, especially monocyrstalline quartz, and silicon carbide, especially monocrystalline silicon carbide.
  • FIG. 1 is an exploded view of the components of a pickup needle designed according to the teachings of the present invention prior to final machining;
  • FIG. 2 schematically illustrates a finished machined pickup needle produced according to the teachings of this invention.
  • FIG. 1 there is shown a blank 1 of a cylindrical shaft, formed of any of the materials heretofore disclosed, and which is provided at its upper end face with a slight depression or recess 2.
  • Reference numeral 3 designates a layer of a hard solder and reference character 4 a raw or semi-finished diamond grain.
  • Soldering of the diamond grain 4 to the blank shaft 1 can be performed, for instance, by way of example but not exclusively, according to the techniques described in U.S. Pat. No. 2,570,248, so that no further discussion thereof would appear to be necessary.
  • the blank shaft 1 possesses a diameter which is in the order of 0.6 and 1.0 mm. and in its raw or blank state its length, similar to the known pickup needles formed completely of sapphire, is in the order of 0.8 and 1.6 mm.
  • the selection of such dimensions depends to a large degree upon the machining means used for grinding the tip.
  • the finished machine tip has been illustrated in FIG. 2. it will be recognized that the blank shaft 1 of FIG. 1 is slightly conically pointed at its end carrying the diamond grain 4 and therefore has now become the needle shaft 1'. Similarly, the hard solder layer is apparent and has been designated by reference character 3' whereas the diamond grain 4 has been essentially ground into a cone 4' having a rounded tip 5 and further possesses a highly polished outer surface at least at the region of tip 5. The degree of finishing or machining of the pickup needle depicted in FIG.
  • 2 corresponds to the needles employed in commercially available pickups, that is to say, possess a diameter in the order of magnitude between 0.4 and 0.8 mm., a length in the order of magnitude of 0.8 to 1.2 mm., a cone angle of the tip in the order of magnitude of 40 to 60, a radius of curvature of the tip in the order of magnitude of 0.012 to 0.025 mm (for long playing records).
  • bi-radial tip that is, a tip the cone of which at least at the region of the rounded portion of the tip possesses an elliptical outline so that the rounded portion of the tip in two axial cutting planes perpendicular to one another possesses a respective minimum value of for instance 0.012 mm. and a maximum value of for instance 0.025 mm.
  • the described pickup needle is just as nonsensitive to corrosion effects of all types, such as those caused by humidity, smoke, human perspiration, anti-static agents, and so forth, as pure diamond needies, yet in contrast to such is a number of times cheaper.
  • the pickup needle advantageously possesses a lower specific weight, which preferably amounts to about 4.00 gm/cm or less, depending upon the specific material selected for the shaft.
  • a pickup needle comprising a non-metallic shaft, a diamond tip, and a hard solder layer therebetween bonding the diamond tip to such nonmetallic shaft, said non-metallic shaft being formed of a material selectedfrom the group consisting of silicon carbide, boron carbide, corundum, and quartz.

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  • Crystals, And After-Treatments Of Crystals (AREA)
  • Ceramic Products (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
US00249687A 1971-06-12 1972-05-01 Pickup needle Expired - Lifetime US3813101A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH860571A CH554578A (de) 1971-06-12 1971-06-12 Tonabnehmer-nadel.

Publications (1)

Publication Number Publication Date
US3813101A true US3813101A (en) 1974-05-28

Family

ID=4342531

Family Applications (1)

Application Number Title Priority Date Filing Date
US00249687A Expired - Lifetime US3813101A (en) 1971-06-12 1972-05-01 Pickup needle

Country Status (9)

Country Link
US (1) US3813101A (fr)
JP (1) JPS5551244B1 (fr)
BE (1) BE784733A (fr)
CH (1) CH554578A (fr)
DE (1) DE2221428C3 (fr)
FR (1) FR2141679B1 (fr)
GB (1) GB1344227A (fr)
IT (1) IT956484B (fr)
NL (1) NL170570C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4105213A (en) * 1975-10-15 1978-08-08 Victor Company Of Japan, Ltd. Device for cutting a sound groove on a disc recording medium
US4542493A (en) * 1980-12-05 1985-09-17 Victor Company Of Japan, Limited Pickup stylus having fused diamond and ceramic bodies with conductive surfaces for capacitance disk records
USD882653S1 (en) 2015-07-06 2020-04-28 Sumitomo Electric Hardmetal Corp. Drilling tool

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0020843A1 (fr) * 1979-06-22 1981-01-07 Diamond S.A. Aiguille de pick-up pour phonographe
AT365800B (de) * 1979-10-12 1982-02-10 Akg Akustische Kino Geraete Herstellverfahren fuer eine nadel eines tonabnehmers

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1110428A (en) * 1910-03-23 1914-09-15 New Jersey Patent Co Process of forming phonograph-styli.
US1737253A (en) * 1926-10-02 1929-11-26 Rca Corp Means for recording and reproducing sound
US2564136A (en) * 1943-03-04 1951-08-14 Hartford Nat Bank & Trust Co Corundum crystal recording or reproducing member
US2659181A (en) * 1947-01-30 1953-11-17 Union Carbide & Carbon Corp Process of and apparatus for forming styluslike articles from corundum or spinel
US2960759A (en) * 1957-12-27 1960-11-22 Gen Electric Methods of manufacturing phonograph styli
US2992007A (en) * 1957-12-27 1961-07-11 Gen Electric Phonograph stylus
US3271036A (en) * 1963-05-06 1966-09-06 Paul L Kuzmick Phonograph stylus and method of making same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1110428A (en) * 1910-03-23 1914-09-15 New Jersey Patent Co Process of forming phonograph-styli.
US1737253A (en) * 1926-10-02 1929-11-26 Rca Corp Means for recording and reproducing sound
US2564136A (en) * 1943-03-04 1951-08-14 Hartford Nat Bank & Trust Co Corundum crystal recording or reproducing member
US2659181A (en) * 1947-01-30 1953-11-17 Union Carbide & Carbon Corp Process of and apparatus for forming styluslike articles from corundum or spinel
US2960759A (en) * 1957-12-27 1960-11-22 Gen Electric Methods of manufacturing phonograph styli
US2992007A (en) * 1957-12-27 1961-07-11 Gen Electric Phonograph stylus
US3271036A (en) * 1963-05-06 1966-09-06 Paul L Kuzmick Phonograph stylus and method of making same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4105213A (en) * 1975-10-15 1978-08-08 Victor Company Of Japan, Ltd. Device for cutting a sound groove on a disc recording medium
US4542493A (en) * 1980-12-05 1985-09-17 Victor Company Of Japan, Limited Pickup stylus having fused diamond and ceramic bodies with conductive surfaces for capacitance disk records
USD882653S1 (en) 2015-07-06 2020-04-28 Sumitomo Electric Hardmetal Corp. Drilling tool
USD910093S1 (en) * 2015-07-06 2021-02-09 Sumitomo Electric Hardmetal Corp. Drilling tool

Also Published As

Publication number Publication date
DE2221428C3 (de) 1975-04-30
FR2141679B1 (fr) 1978-09-08
NL170570C (nl) 1982-11-16
FR2141679A1 (fr) 1973-01-26
DE2221428A1 (de) 1972-12-21
NL7206618A (fr) 1972-12-14
GB1344227A (en) 1974-01-16
DE2221428B2 (de) 1974-09-05
IT956484B (it) 1973-10-10
BE784733A (fr) 1972-12-12
CH554578A (de) 1974-09-30
JPS5551244B1 (fr) 1980-12-23
NL170570B (nl) 1982-06-16

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