US1784845A - Phonograph needle - Google Patents
Phonograph needle Download PDFInfo
- Publication number
- US1784845A US1784845A US310259A US31025928A US1784845A US 1784845 A US1784845 A US 1784845A US 310259 A US310259 A US 310259A US 31025928 A US31025928 A US 31025928A US 1784845 A US1784845 A US 1784845A
- Authority
- US
- United States
- Prior art keywords
- needle
- diaphragm
- phonograph needle
- point
- phonograph
- 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
Links
- 210000000188 diaphragm Anatomy 0.000 description 11
- 239000002184 metal Substances 0.000 description 4
- 229910052594 sapphire Inorganic materials 0.000 description 4
- 239000010980 sapphire Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 240000007182 Ochroma pyramidale Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000005520 electrodynamics Effects 0.000 description 2
- 229910000737 Duralumin Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- 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
- G11B3/48—Needles
Definitions
- This invention relates to reproducers adapted to be used for playing-back original soft wax records and more particularly to a needle suitable foi such i eproducers.
- a playback needle must be very light and very stiff to reproduce records faithfully and without injury to the soft wax. All of these requirements are met satisfactorily by a needle having a body portion of light weight wood fitted with a sapphire point and covered with a thin coating of duralumin paint. As the point is very durable the needle preferably is secured permanently to the diaphragm.
- Fig. 1 shows the needle of this invention applied to one type of re.- producer
- Fig. 2 is a detail view of the needle.
- Fig. 1 discloses one form of electrodynamic or moving coil reproducer with which these needles may be advantageously used.
- the diaphragml is adapted to flex about the diameter normal to the plane of the drawing and is stiffened against flexure at right angles to this axis by groove 2.
- Groove 3 further stifiens the diaphragm against local fiexurc of the portion in contact with the needle 4.
- a suitable coil 5 carried by the diaphragm moves with it in an annular gap between pole pieces 7-7' and another magnetic member 8.
- An exciting winding 9 produces a steady flux in the gap so that movements of the needle are transundesirable local vibration in the needle and in the diaphragm is prevented by making the needle base unusually large thereby giving the needle very great inherent stiffness and providing large area of contact ,with the diaphragm.
- Fig. 2 The construction of the needle 4 is clearly shown in Fig. 2 in which the main body portion 10 is shown as a cone of balsa wood with a non-linear taper. Grooves 11 and 12 in the base of the cone correspond to grooves 2 and 3 in the diaphragm and insure that the needle will be properly located on the diaphragm when it is secured in place.
- the sapphire point 13 is permanently cemented into the end of the cone and the coating of metal paint 14 is sprayed on the body portion to a thickness of about 10 mils (for a needle 1 inch long).
- the body portion need not be exactly as shown but may take any form which results in a needle of the proper weight and stiffness. It also will be understood that for best results the thickness of the metal coating should be varied in accordance with the diameter and length of needle employed.
- base diameter of the body being comparable to its length.
- a moving system including a wooden needle of large base diameter attached to a diaphragm the needle being coated with metal and fitted with a permanent point.
- a moving system including a balsa wobd needle, of large base diameter attached to a dia phragm the needle bein alumin paint and fitte point.
Landscapes
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Description
Dec. 16, 1930. o mso r 1,784,845
PHONOGRAPH NEEDLE Filed Oct. 4, 1928 //v VENTOH Laws .4. MORRISON Patented Dec. 16, 1930 UNITED STATES PATENT OFFICE LOUIS A. monarson, or BROOKLYN, NEW YORK, ASSIGNOR TO BELL TELEPHONE minoaa'romns, .INGQBEQBAQ PB F I EW YORK, N. Y., A CORPORATION or NEW YORK PHONOGRAPH NEEDLE Application filed October 4, 1228. Serial No. 310,259.
This invention relates to reproducers adapted to be used for playing-back original soft wax records and more particularly to a needle suitable foi such i eproducers.
It is the object of-this invention to provide a needle of this sort which is of sturdy construction, easy to make, and of the permanent type.
In addition to these features it is understood of course that a playback needle must be very light and very stiff to reproduce records faithfully and without injury to the soft wax. All of these requirements are met satisfactorily by a needle having a body portion of light weight wood fitted with a sapphire point and covered with a thin coating of duralumin paint. As the point is very durable the needle preferably is secured permanently to the diaphragm.
In the drawing, Fig. 1 shows the needle of this invention applied to one type of re.- producer, and
Fig. 2 is a detail view of the needle.
These needles are particularly adapted for use with reproducers of either the electromagnetic or the electrodynamic type in "which theyfiex.the diaphragm about one of its diameters. Fig. 1 discloses one form of electrodynamic or moving coil reproducer with which these needles may be advantageously used. 'The diaphragmlis adapted to flex about the diameter normal to the plane of the drawing and is stiffened against flexure at right angles to this axis by groove 2. Groove 3 further stifiens the diaphragm against local fiexurc of the portion in contact with the needle 4. A suitable coil 5 carried by the diaphragm moves with it in an annular gap between pole pieces 7-7' and another magnetic member 8. An exciting winding 9 produces a steady flux in the gap so that movements of the needle are transundesirable local vibration in the needle and in the diaphragm is prevented by making the needle base unusually large thereby giving the needle very great inherent stiffness and providing large area of contact ,with the diaphragm.
The construction of the needle 4 is clearly shown in Fig. 2 in which the main body portion 10 is shown as a cone of balsa wood with a non-linear taper. Grooves 11 and 12 in the base of the cone correspond to grooves 2 and 3 in the diaphragm and insure that the needle will be properly located on the diaphragm when it is secured in place. The sapphire point 13 is permanently cemented into the end of the cone and the coating of metal paint 14 is sprayed on the body portion to a thickness of about 10 mils (for a needle 1 inch long).
Obviously the body portion need not be exactly as shown but may take any form which results in a needle of the proper weight and stiffness. It also will be understood that for best results the thickness of the metal coating should be varied in accordance with the diameter and length of needle employed. The low mass and high stiffness ralumin and fitted with a sapphire point, the
base diameter of the body being comparable to its length.
4:. In an electrical pick-up device a moving system including a wooden needle of large base diameter coated with metal and attached to a diaphragm.
4. In an electrical pick-up device a moving system including a wooden needle of large base diameter attached to a diaphragm the needle being coated with metal and fitted with a permanent point.
5. In an electrical pick-up device a moving system including a balsa wobd needle, of large base diameter attached to a dia phragm the needle bein alumin paint and fitte point.
coated with durwith a sapphire In witness whereof, I hereunto subscribe my name this 29th'da of Se tember, 1928.
LOUI
ORRISON.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US310259A US1784845A (en) | 1928-10-04 | 1928-10-04 | Phonograph needle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US310259A US1784845A (en) | 1928-10-04 | 1928-10-04 | Phonograph needle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1784845A true US1784845A (en) | 1930-12-16 |
Family
ID=23201677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US310259A Expired - Lifetime US1784845A (en) | 1928-10-04 | 1928-10-04 | Phonograph needle |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1784845A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2619353A (en) * | 1949-08-16 | 1952-11-25 | Elliott H Kahn | Phonograph needle or stylus |
-
1928
- 1928-10-04 US US310259A patent/US1784845A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2619353A (en) * | 1949-08-16 | 1952-11-25 | Elliott H Kahn | Phonograph needle or stylus |
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