US2564136A - Corundum crystal recording or reproducing member - Google Patents

Corundum crystal recording or reproducing member Download PDF

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Publication number
US2564136A
US2564136A US680910A US68091046A US2564136A US 2564136 A US2564136 A US 2564136A US 680910 A US680910 A US 680910A US 68091046 A US68091046 A US 68091046A US 2564136 A US2564136 A US 2564136A
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Prior art keywords
crystal
longitudinal axis
corundum crystal
recording
crystal recording
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Expired - Lifetime
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US680910A
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Verheyen Coenraad Cornelis
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/27—Cutters, for shaping comprising tool of specific chemical composition

Definitions

  • the invention relates generally to cutting members for mechanically recording or reproducing records, such as phonograph records, for example, and more particularly to those members, which consists of a crystal.
  • Fig. 4 represents part of a phonograph needle wherein B-B also represents the longitudinal axis.
  • a member for mechanically recording or reproducing phonograph records comprising a uniaxial corundum crystal, said member having the longitudinal axis thereof perpendicular to the principal axis of said crystal said member having a pair of side surfaces each substantially parallel to said longitudinal axis and another pair of surfaces at one end thereof each extending from one of said side surfaces, respectively, at a substantial angle to said longitudinal axis and intersecting with each other to form a substantially sharp edge at said one end thereof.
  • a member for mechanically recording or reproducing phonograph records comprising a crystal having only one principal axis, said member having the longitudinal axis thereof perpendicular to said principal axis of said crystal, said member having a pair of side surfaces each substantially parallel to said longitudinal axis and another surface at one end thereof extending from one of said side surfaces at a substantial angle to said longitudinal axis and terminating to form a substantially sharp edge at said one end thereof.
  • a member for mechanically recording or reproducing phonograph records comprising a crystal having only one principal axis, said member having the longitudinal axis thereof perpendicular to said principal axis of said crystal, said member having a pair of side surfaces each substantially parallel to said longitudinal axis and another pair of surfaces at one end thereof each extending from one of said side surfaces, respectively, at a substantial angle to said longitudinal axis and intersecting with each other to form a substantially sharp edge at said one end thereof.

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  • Crystals, And After-Treatments Of Crystals (AREA)

Description

Aug. 14, 1951 c. c. VERHEYEN ,564,
CORUNDUM CRYSTAL RECORDING OR REPRODUCING MEMBER I Filed July 2, 1946 INVENTOR. VERHEYEN COENRAAD C.
AGENT Patented Aug. 14, 1951 CORUNDUM CRYSTAL RECORDING OR REPRODUCIN G MEMBER Coenraad Cornelis Verheyen, Eindhoven, Netherlands, assignor to Hartford National Bank and Trust Company, Hartford, Conn., as trustee Application July 2, 1946, Serial No. 680,910 In the Netherlands March 4, 1943 Section 1, Public Law 690, August 8, 1946 Patent expires March 4, 1963 3 Claims.
The invention relates generally to cutting members for mechanically recording or reproducing records, such as phonograph records, for example, and more particularly to those members, which consists of a crystal.
In recording sound with the aid of such a cutting member which is made, for example, of corundum crystal and which has a V-shaped cutting edge, there arises the drawback that the cutting edges wear off very soon or that small pieces of crystal break off therefrom, with the result that, for example, sound tracks recorded with the aid of such a member have, during reproduction, a kind of fading effect with distortion. As regards members with the aid of which, for example, mechanically provided sound tracks are reproduced, the above-mentioned drawback results in that the oscillation tracks wear off or are damaged more rapidly than usual.
With the member according to the invention, this drawback is avoided due to the fact that the longitudinal axis of the member and the principal axis of the crystal are perpendicular to one another, which may be achieved by a properly chosen method of grinding. It has been found achieve that the axis B-B will be perpendicular to the axis AA.
Fig. 4 represents part of a phonograph needle wherein B-B also represents the longitudinal axis.
What I claim is:
1. A member for mechanically recording or reproducing phonograph records comprising a uniaxial corundum crystal, said member having the longitudinal axis thereof perpendicular to the principal axis of said crystal said member having a pair of side surfaces each substantially parallel to said longitudinal axis and another pair of surfaces at one end thereof each extending from one of said side surfaces, respectively, at a substantial angle to said longitudinal axis and intersecting with each other to form a substantially sharp edge at said one end thereof.
2. A member for mechanically recording or reproducing phonograph records comprising a crystal having only one principal axis, said member having the longitudinal axis thereof perpendicular to said principal axis of said crystal, said member having a pair of side surfaces each substantially parallel to said longitudinal axis and another surface at one end thereof extending from one of said side surfaces at a substantial angle to said longitudinal axis and terminating to form a substantially sharp edge at said one end thereof.
3. A member for mechanically recording or reproducing phonograph records comprising a crystal having only one principal axis, said member having the longitudinal axis thereof perpendicular to said principal axis of said crystal, said member having a pair of side surfaces each substantially parallel to said longitudinal axis and another pair of surfaces at one end thereof each extending from one of said side surfaces, respectively, at a substantial angle to said longitudinal axis and intersecting with each other to form a substantially sharp edge at said one end thereof.
COENRAAD CORNELIS V'ERHEYEN.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 484,583 Edison Oct. 18, 1922 1,737,253 Linsell Nov. 26, 1929 2,355,877 Le Van l Aug. 15, 1944 FOREIGN PATENTS Number Country Date 402,575 France Oct. 12, 1902 728,644 France Apr. 18, 1932 751,047 France June 12; 1933
US680910A 1943-03-04 1946-07-02 Corundum crystal recording or reproducing member Expired - Lifetime US2564136A (en)

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NL2564136X 1943-03-04

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3079670A (en) * 1959-09-08 1963-03-05 Dow Chemical Co Slitting tool
US3758928A (en) * 1972-07-03 1973-09-18 Cooper Corp Tool for use in book binding
US3813101A (en) * 1971-06-12 1974-05-28 E Benz Pickup needle
US3834265A (en) * 1973-02-16 1974-09-10 Gillette Co Ceramic cutting instruments
US4120742A (en) * 1975-10-30 1978-10-17 Victor Company Of Japan, Limited Capacitance type pickup stylus and method of producing same
US4662801A (en) * 1984-12-07 1987-05-05 Hitachi, Ltd. Cutting tool

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US484583A (en) * 1892-10-18 Phonograph cutting-tool
FR402575A (en) * 1909-04-29 1909-10-12 G Ballu Et Cie Soc Wear-resistant diaphragm for talking machines
US1737253A (en) * 1926-10-02 1929-11-26 Rca Corp Means for recording and reproducing sound
FR728644A (en) * 1931-12-19 1932-07-08 Device allowing the transformation of recordings of sound vibrations into electrical vibrations and vice versa
FR751047A (en) * 1933-02-17 1933-08-25 Pick-up refinements
US2355877A (en) * 1942-08-18 1944-08-15 Hamilton Watch Co Processing crystalline structures

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US484583A (en) * 1892-10-18 Phonograph cutting-tool
FR402575A (en) * 1909-04-29 1909-10-12 G Ballu Et Cie Soc Wear-resistant diaphragm for talking machines
US1737253A (en) * 1926-10-02 1929-11-26 Rca Corp Means for recording and reproducing sound
FR728644A (en) * 1931-12-19 1932-07-08 Device allowing the transformation of recordings of sound vibrations into electrical vibrations and vice versa
FR751047A (en) * 1933-02-17 1933-08-25 Pick-up refinements
US2355877A (en) * 1942-08-18 1944-08-15 Hamilton Watch Co Processing crystalline structures

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3079670A (en) * 1959-09-08 1963-03-05 Dow Chemical Co Slitting tool
US3813101A (en) * 1971-06-12 1974-05-28 E Benz Pickup needle
US3758928A (en) * 1972-07-03 1973-09-18 Cooper Corp Tool for use in book binding
US3834265A (en) * 1973-02-16 1974-09-10 Gillette Co Ceramic cutting instruments
US4120742A (en) * 1975-10-30 1978-10-17 Victor Company Of Japan, Limited Capacitance type pickup stylus and method of producing same
US4662801A (en) * 1984-12-07 1987-05-05 Hitachi, Ltd. Cutting tool

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