US1812634A - Sound reproducer - Google Patents

Sound reproducer Download PDF

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Publication number
US1812634A
US1812634A US287722A US28772228A US1812634A US 1812634 A US1812634 A US 1812634A US 287722 A US287722 A US 287722A US 28772228 A US28772228 A US 28772228A US 1812634 A US1812634 A US 1812634A
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United States
Prior art keywords
needle
reproducer
point
sound reproducer
mass
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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
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US287722A
Inventor
Warren C Jones
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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Publication date
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US287722A priority Critical patent/US1812634A/en
Application granted granted Critical
Publication of US1812634A publication Critical patent/US1812634A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus

Definitions

  • a needle suitable for this purpose should be sufiiciently light and stiff that its length is the controlling factor in reducing the needle point mass; it should also be of a permanentor semi-permanent character and ada pted for ready-attachment -.to the associated parts without the addition of unnecessary masses to the moving structure,
  • Fig. 1 is a sectional view of a reproducer embodying this invention.
  • Fig. 2 is a perspective view of a needleshow ing the method of attachment to the diaphragm. i
  • the reproducer 1 is preferably of the bipolar electromagnetic type as shown and similar. to that disclosed in Patent 1,746,730, granted to me February 11, 1930, in which the diaphragm 2 forms a flexible closure for the container of the viscous matter 3.
  • the diaphragm also con- Y stitutes a rocking support for the armature 4 which greatlystifiens the diaphragm in one direction but 'perinits substantially free flexing in the other.
  • One form of needle which has been found suitable for play-back purposes consists of a conical shell of nickel about 1" long and sufliciently thin that its mass effective at the needle point is about .010 gms. Such a needle may be made from thin sheet material and fitted with a suitable point but it has been found preferable to 'electroform these 1928. Serial No. 287,722.
  • a reproducer needle comprising a conical shell of metal with a hard metal surface at its point and a mounting member at its base.
  • a reproducer needle comprising a hollow conical shell of nickel, fitted with amounting member and chromium plated and contoured at its point to fit a record groove.
  • a stifi' reproducer needle having a length of the order of one inch and an effective needle-point mass of the order of .010
  • a reproducer needle comprising a hollow cone of metal having a length of the order of one: inch and an effective needlepoint mass ofthe order of .010 grams.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Knitting Machines (AREA)

Description

June 30, 1931. -w, JONES 1,812,634
SOUND REPRODUCER Filed June 23, 1928 //v l/EN TO/P Manna-N C. Jon/5 A 7' TURN/F) Patented June 30, 1931 UNITED STATES PATENT OFFICE WARREN C; JONESfOF. FLUSHING, NEW YORK, ASS IGNOR TO BELL TELEPHONE LAB- ORATORIES, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK SOUND REPROD'O'CER Application filed June as,
' structure of sufiiciently low mass and stiifness to 'meet the requirements for a playback when comparatively soft recording material is used.
A needle suitable for this purpose should be sufiiciently light and stiff that its length is the controlling factor in reducing the needle point mass; it should also be of a permanentor semi-permanent character and ada pted for ready-attachment -.to the associated parts without the addition of unnecessary masses to the moving structure,
In the drawings Fig. 1 is a sectional view of a reproducer embodying this invention. Fig. 2 is a perspective view of a needleshow ing the method of attachment to the diaphragm. i
Referring'to 1 the reproducer 1 is preferably of the bipolar electromagnetic type as shown and similar. to that disclosed in Patent 1,746,730, granted to me February 11, 1930, in which the diaphragm 2 forms a flexible closure for the container of the viscous matter 3. The diaphragm also con- Y stitutes a rocking support for the armature 4 which greatlystifiens the diaphragm in one direction but 'perinits substantially free flexing in the other. I
In the present invention, however, the
stylus holder is eliminated and the needle 4 5 is fitted with a threaded base member 6 which directly engages the threaded stud 7 projecting from the armature.
One form of needle which has been found suitable for play-back purposes consists of a conical shell of nickel about 1" long and sufliciently thin that its mass effective at the needle point is about .010 gms. Such a needle may be made from thin sheet material and fitted with a suitable point but it has been found preferable to 'electroform these 1928. Serial No. 287,722.
needles on a suitable mandrel as, described in Patent No. 1,733,608, granted to WV. G. Knox, et al., Oct. 29, 1929.
By contouring the point of this cone to fit the record grooves and then electro-depositing on it a thin layer of chromium, a needle of semi-permanent character is obtained. When it becomes necessary the needle may be replaced very easily without dismantling the reproducer due to the spe cial construction already described.
l Vhat is claimed is: p
1. A reproducer needle comprising a conical shell of metal with a hard metal surface at its point and a mounting member at its base.
2. A reproducer needle comprising a hollow conical shell of nickel, fitted with amounting member and chromium plated and contoured at its point to fit a record groove.
3. A stifi' reproducer needle having a length of the order of one inch and an effective needle-point mass of the order of .010
grams. i
.4. A reproducer needle comprising a hollow cone of metal having a length of the order of one: inch and an effective needlepoint mass ofthe order of .010 grams. a In witness whereof, I hereunto subscribe my'name this 21st day of June, 1928.
' WARREN C. JONES.
US287722A 1928-06-23 1928-06-23 Sound reproducer Expired - Lifetime US1812634A (en)

Priority Applications (1)

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US287722A US1812634A (en) 1928-06-23 1928-06-23 Sound reproducer

Applications Claiming Priority (1)

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US287722A US1812634A (en) 1928-06-23 1928-06-23 Sound reproducer

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US1812634A true US1812634A (en) 1931-06-30

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Family Applications (1)

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US287722A Expired - Lifetime US1812634A (en) 1928-06-23 1928-06-23 Sound reproducer

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435149A (en) * 1944-09-12 1948-01-27 Mitchell Issac Allen Educational toy
US3215439A (en) * 1963-05-03 1965-11-02 Astatic Corp Compliant phonograph stylus mounting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435149A (en) * 1944-09-12 1948-01-27 Mitchell Issac Allen Educational toy
US3215439A (en) * 1963-05-03 1965-11-02 Astatic Corp Compliant phonograph stylus mounting

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