US1906615A - Electric pick-up - Google Patents

Electric pick-up Download PDF

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Publication number
US1906615A
US1906615A US271813A US27181328A US1906615A US 1906615 A US1906615 A US 1906615A US 271813 A US271813 A US 271813A US 27181328 A US27181328 A US 27181328A US 1906615 A US1906615 A US 1906615A
Authority
US
United States
Prior art keywords
pole pieces
armature
sound
magnet
coil
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
US271813A
Other languages
English (en)
Inventor
James M Kendall
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority to NL28475D priority Critical patent/NL28475C/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US271813A priority patent/US1906615A/en
Priority to DEA57470D priority patent/DE613236C/de
Priority to FR37829D priority patent/FR37829E/fr
Priority to GB12437/29A priority patent/GB310284A/en
Priority to FR37830D priority patent/FR37830E/fr
Priority to FR37832D priority patent/FR37832E/fr
Priority to FR37835D priority patent/FR37835E/fr
Priority to FR37837D priority patent/FR37837E/fr
Priority to FR38851D priority patent/FR38851E/fr
Priority to FR38884D priority patent/FR38884E/fr
Priority to FR39679D priority patent/FR39679E/fr
Application granted granted Critical
Publication of US1906615A publication Critical patent/US1906615A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/16—Mounting or connecting stylus to transducer with or without damping means
    • 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

  • My invention relates to apparatus for producing sound, and has for-its principal object the provision of an improved sound producing apparatus which possesses low impedance, has a comparatively wide range of frequency response, and operates with greater flexibility than the sound producing apparatus heretofore provided.
  • FIG. 1 and 2 illustrate a phonographicreproducer or electrical pick-up devicewherein my invention has been embodied; and Fig. 3 illustrates a system wherein this reproducer may be utilized.
  • the sound producing appartus or phonographic reproducer illustrated by the drawing includes a magnet 10 provided with bipartite pole piecesll and 12which are arranged to support and partlyenclose a low impedance coil 13' interposed between the upper extensions Hand 15 and the lower 1928.
  • a resilientblock I T 2 1 of rubber or the like and an adjusting plate 25 are provided in order to center the upper end of the armature 18' between the upper pole piece extensions 14,.a11d15 and to control the movement of the armature.
  • the block 245 may be grooved at its lo'wersurface to receive the upper end of the armature, preferably rests on small ledges 40 at the top oftheupper pole piece extensionsll and l5so asto oppose little frictional force to the movement of the armature, and is clamped to these ex tensions by means of screws 26 and the adjusting plate 25 which may be moved slightly in one directiouor the other for the purpose of centering the armature between the pole pieces.
  • the resilient member 24 is subject to substantially no compressive and frictional forces due to thefact that it is held by its edges which are clamped between the ledges 40 and the adjusting plate 25.
  • the armature moves through a distance which is small as compared to the dimensions of the rubber block along the direction of travel ofthe armature and moves freely.
  • the casing ofthe apparatus includes a member 27 to which theam agnet 10-is attached by means of a screw 28fland a 'clampingplate '29 .and towhich the pole pieces 11' and 12 are attached by means of bolts 30 and 31.
  • This oasing also includes a cover member 32 which 'isattached to the clamping-plate 29 by means of screws 33. It will be seen that pole pieces 11, 12 areprovided with upper surfaces which are in engagement with the surfaces of the bottom ends of magnet 10. This construction avoids the necessity of bolts between the pole pieces and magnet and permits lateral adjustment of the pole pieces. Assembly of the unit is simplified since means entirely independent of the contacting surfaces of the pole pieces and magnet maintain the magnet and pole pieces in proper relation. The magnetic attraction holds the magnet to the pole pieces, this being supplemented by holding means associated with the casing, such as clamping plate 29.
  • the coil 13 is connected to current supply terminals 34 through a volume control potentiometer 35 and a transformer 36 which may possess a high transformation ratio.
  • this low impedance coil is advantageous in that it makes possible the use of a small coil and a short armature which possesses a comparatively low moment of inertia and has a better response, especially at low frequencies, than the armature heretofore utilized.
  • the flexible armature mounting made possible by the member 24 has the advantages of ease in the adjustment of the apparatus, greater amplitude of the armature motion in the air gap, higher voltage per turn, greater reliability in operation due to the fact that the centering and damping member, because of the extremely small amount of compression, does not take a permanent set and operates with substantially no friction and uniformity in production due to the fact that the comparatively large damping member may be cut with greater accuracy than the comparatively small resilient stops heretofore used, and less wear on the phonograph record both at high and low frequencies.
  • the coil 13 has from 50 to 1200 turns and has an impedance which may vary from 9 to 4640 ohms at 10000 cycles depending on the number of turns.
  • the armature 18 may vary somewhat in length but preferably has a moment of inertia which is less than .15 gm cms. and may readily be made as low as .08 gm cmsF.
  • the terms low impedance and short are used herein to designate a coil and an armature having these characteristics.
  • a sound producer the combination of a pair of magnetic pole pieces, a relatively broad resilient member clamped to said pole pieces along limited portions of said member adjacent opposing edges thereof, said member having a portion of sub stantial extent intermediate said clamped portions, said intermediate portion being unconfined over both upper and lower surfaces thereof, whereby said intermediate portion of said member is subjected to substantially no compressive and frictional force, and an armature pivoted between said pole pieces near one of its ends and mechanically coupled to said intermediate portion of said resilient member at the other of its ends.
  • potentiometer having a resistance of less than one hundred ohms connected to the terminals of said coil.
  • a pair of magnetic pole pieces a single resilient block clamped along relatively narrow portions thereof adjacent two opposite edges thereof on the tops of said pole pieces, said block having a central portion unconfined over both upper and lower surfaces thereof, and an armature pivoted between said pole pieces near one of its ends and arranged to engage said resilient block at the other of its ends at a point of said central portion of said block intermediate said edges.
  • a pair of magnetic pole pieces having extensions forming an air gap, an armaturev adapted to vibrate in said air gap, a ledge formed on each of said extensions and spaced from the end of said extension adj acent said armature, a resilient member mounted on said ledges, said armature being pivoted between said pole pieces near one of its ends and arranged to engage said member at the other of its ends.
  • a pair ofmagnetic pole pieces each having a ledge formed thereon, a resilient member mounted along two opposite edgesthere of on said ledges, means including-an adjusting plate connected to said pole pieces to clamp said resilient member to said ledges, and an armature pivoted between said pole pieces near one of its ends and arranged to engage said resilient member at the other of its ends.
  • pole pieces being laterally adjustable through a small distance relatively to each other across said plane ends of said magnet to vary the length of said air gap, and means to fasten said pole pieces to said casing member.
  • a magnet having two plane end surfaces, a pair of pole pieces each having a plane contact surface, each of said contact surfaces being laterally slidable across a different one of said end surfaces to adjust the distance apart of said pole pieces, and means independent of said magnet surface and said pole piece surfaces to maintain each of said a lower plane end surface of said magnet,
  • pole piece surfaces in adjusted position in contact with a diiferentone of said magnet surfaces.
  • each of said pole pieces having an upper plane surface engaging a plane end surface of said magnet, each of said casing means to assist the magnetic attraction between said magnet and said pole pieces in maintaining said pole piece surfaces in adjusted position in contact withsaid magnet surfaces.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Adjustable Resistors (AREA)
US271813A 1925-03-03 1928-04-21 Electric pick-up Expired - Lifetime US1906615A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
NL28475D NL28475C (en, 2012) 1928-04-21
US271813A US1906615A (en) 1928-04-21 1928-04-21 Electric pick-up
DEA57470D DE613236C (de) 1928-04-21 1929-04-16 Elektrische Schalldose fuer Sprechmaschinen
FR37829D FR37829E (fr) 1925-03-03 1929-04-19 Perfectionnements aux systèmes amplificateurs
GB12437/29A GB310284A (en) 1928-04-21 1929-04-22 Improvements in and relating to apparatus for the electrical reproduction of sound
FR37830D FR37830E (fr) 1925-03-03 1929-05-08 Perfectionnements aux systèmes amplificateurs
FR37832D FR37832E (fr) 1925-03-03 1929-06-06 Perfectionnements aux systèmes amplificateurs
FR37835D FR37835E (fr) 1925-03-03 1929-08-22 Perfectionnements aux systèmes amplificateurs
FR37837D FR37837E (fr) 1925-03-03 1929-09-24 Perfectionnements aux systèmes amplificateurs
FR38851D FR38851E (fr) 1925-03-03 1929-10-04 Perfectionnements aux systèmes amplificateurs
FR38884D FR38884E (fr) 1925-03-03 1930-07-09 Perfectionnements aux systèmes amplificateurs
FR39679D FR39679E (fr) 1925-03-03 1930-12-12 Perfectionnements aux systèmes amplificateurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US271813A US1906615A (en) 1928-04-21 1928-04-21 Electric pick-up

Publications (1)

Publication Number Publication Date
US1906615A true US1906615A (en) 1933-05-02

Family

ID=23037202

Family Applications (1)

Application Number Title Priority Date Filing Date
US271813A Expired - Lifetime US1906615A (en) 1925-03-03 1928-04-21 Electric pick-up

Country Status (4)

Country Link
US (1) US1906615A (en, 2012)
DE (1) DE613236C (en, 2012)
GB (1) GB310284A (en, 2012)
NL (1) NL28475C (en, 2012)

Also Published As

Publication number Publication date
DE613236C (de) 1935-05-16
GB310284A (en) 1930-09-22
NL28475C (en, 2012)

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