US1732427A - Electric pick-up device - Google Patents

Electric pick-up device Download PDF

Info

Publication number
US1732427A
US1732427A US296059A US29605928A US1732427A US 1732427 A US1732427 A US 1732427A US 296059 A US296059 A US 296059A US 29605928 A US29605928 A US 29605928A US 1732427 A US1732427 A US 1732427A
Authority
US
United States
Prior art keywords
diaphragm
electric
movements
stylus
variations
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
US296059A
Inventor
Andrewes Humfrey
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.)
Radio Patents Corp
Original Assignee
Radio Patents Corp
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
Application filed by Radio Patents Corp filed Critical Radio Patents Corp
Application granted granted Critical
Publication of US1732427A publication Critical patent/US1732427A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/02Transducers using more than one principle simultaneously

Definitions

  • This invention also refers to an arrangement for translating mechanical movements into corresponding electrical variations and is more particularly directed to means for transforming the vibrations of the stylus of a phonograph into electrical variations for reproduction by a loudspeaker.
  • Such devices have become known under the name of phonograph pick-up devices and are so constructed that they can be attached to an ordinary phonograph, in an easy manner. They present important advantages as,
  • One object of this invention is to receive equal reproduction of the notes of the entire musical scale to be reproduced.
  • Another object of this invention is to provide combined electro-static and electromagnetic pick-up means in such a Way as .to
  • Fig. l is a sectional elevation of the pickup device constructed in accordance with my invention.
  • a Fig. 2 is a front elevation of the device with the sound box cover, stylus, stylus lever, and part of the diaphragm removed.
  • Fig.3 is a diagram of connections.
  • the invention consists of the arrangement of an electro-magnet, preferably annular in shape, having an annular rich as one pole and a centre boss as the other pole, between which poles is disposed a thin annular Winding, and a j a stretched steel diaphragm mounted in close in my U. S. application Serial No. 268,006,
  • the electrostatic portion of the pick-up connected in the usual manner wherein the centre boss 1 of the electro-magnet 6 constitutes the back electrode and is connected to the positive pole 0f the polarizing battery 2 which is preferably variable and which is at the same time the'anode battery for the amplifying three-electrode tubes V and V arranged in resistance coupling connection.
  • the magnetic diaphragm 3 is 0on I nected to the grid of an amplifying valve V and a coupling resistance 23' is connected between the said grid and the grid bias lead 11.
  • the winding 5 on the electro-magnet 6 is connected through a battery 7 to the primary 8 of a step-up transformer 9 and the secondary 10 of the transformer is connected through the variable condenser 18 to the grid 4 at the minus grid bias lead 11 of the tube V
  • a choke 12 is preferably connected in the lead 13 between the diaphragm 3 and the grid of the valve V and a resistance 14 is included in the circuit of the anode of the said valve, forming togetherwith a further lead resistance 15 and a condenser 21 the normal resistance coupling element between the tubes V and V 22 is a heating battery for the tubes and 23 is a grid biasing battery.
  • 24 represents a loudspeaker inserted in the,
  • anode circuit of the last tube for reproduction of the sound vibrations of diaphragm3. 19 is a by-pass condenser bridging the part of resistance 20 inserted in the electrostatic pick-up circuit.
  • the action of the circuit is as follows Movements of the needle 16 actuated by variation of the grooves in the gramophone record cause-the stylus 17 to actuate the diaphragm 3 thereby varying the distance between the diaphragm and the boss 1 which constitutes the back electrode and thecentre pole piece.
  • This movement has,two efiects: Firstly it causes a variation in capacity between the two electrodes represented by the pole-piece and the diaphragm, thereby producing an alternating E. M. F. across the resistance 23' connected between the grid and negative grid bias lead of the first amplifying tube V secondly the movement causes the flux in the electro-magnet 6, formed in the winding 5' and the pole piece 1 producing an alternating E. M. F.
  • the object of the introduction of the choke 12 in the lead of'the grid of tube V to the diaphragm 3 is. to prevent the shunting of the higher frequencies which are produced by two systems may the electro-ma manner the ob ect of the introduction of the etic system, and in a similar polarizing potential tapped from the potentiometer 20in the case of the electrostatic system and by the variable resistance 21 in the primary circuit of the electro-magnetic system.
  • the actual values of the capacities of the variable condenser 18 and the choke 12 depend on the constants of the pick-up device itself.
  • 4 is the metallic tubular extension for connection with a horn or the like when using the device as an ordinary gramophone, which is connected to a terminal 24 serving for connectionto ground.
  • 25 and 26 are terminals servingfor connection to the iron core 6 and the diaphragm 3, respectively and 27 and 28 are binding posts serving for connection with the terminals of the magnet coil 5.
  • An arrangementfor translating the movements of the stylus of a phonograph into electrical variations comprising a flexible diaphragm, means connecting said diaphragm to said stylus for imparting to it said movements, an electric circuit linked with a magnetic field associated with said diaphragm, a further electric circuit including a capacity element of which said diaphragm is a part, an electric discharge device having main electrodes and a control electrode, means to simultaneously apply varying. potential to said control electrode in accordance with electric variations in said electric circuits, and an electric reproducing device actuated. by the output circuit of said discharge device.
  • An arrangement for translating the movements of the stylus of a phonograph into electrical variations comprising a flexible diaphragm of magnetic material subject'to said movements, pole pieces arranged opposite said diaphragm, an electric circuit including a winding arranged on said pole pieces, a further electric circuit including a capacity element constituted bysaid diaphragm and said pole pieces and means for combining electric varia ions in said electric circuits in a common translating device.
  • An arrangement for translatin the movementsof the stylus of a phonograp 1 into electrical variations comprising a flexible diaphragm of'magnetic material subject to said movements, pole pieces arranged opposite said diaphragm, an electric circuit including a winding arranged on said pole pieces, a further electric circuit including a capacity element constituted by said diaphragm and said pole pieces, an electric discharge device having main electrodes and a control electrode, means to simultaneously apply varying potential to said control electrode in accordance with electric variations in said electric circuits, and an electric reproducing device actuated by the output circuit of said discharge device.
  • An arrangement for translating the electrical blocking means are provided in one movements of the stylus of a phonograph into circuit for the single resulting current for 65 electrical variations, comprising a flexible preventing variations of certain frequencies translated by one of the elements from being short-circuited by the other element.
  • An arrangement for translating mechanical movements into corresponding electrical variations comprising a flexible diaphragm subject to said movements, an electric circuit producing a magentic field associated with said diaphragm, a further electric circuit including a capacity element, an electrode of said capacity element including said diaphragm, means for combining the electric variations occurring in said. electric circuits due to the movement of diaphragms in a common translating device and means for varying the components of the single elec tric currents produced by said variations of said electric and magnetic field.
  • an arrangement for translating the mechanical movements of a stylus into corresponding electrical variations comprising a moving member adapted for influencing an electrostatic and a magnetic field, means for transforming the variations of said electrostatic and said magnetic field into asingle electric current variation, and means for relatively varying the components of said electrostatic and said magnetic field producing said single electric current.

Description

Oct. 22, 1929. H, ANDREWES 1,732,427
ELECTRIC PICK-UP DEVICE Filed July 28. 1923 c ll'z INVEHTOR Hum/reg lqha rcures HTTORNEY llll ' all)? Patented Oct. 22, 1929 UNITED STATESTPATENT OFFICE HUMFREY ANDRE'WES, OF LONDON, ENGLAND, ASSIGNOR OF ONE-HALF TO RADIO PAT- ENTS CORPORATION, OF NEW YORK, N. Y.
ELECTRIC PICK-UP DEVIOE Application filed July 28, 1928, Serial No. 296,059, and in Great Britain February 24, 1928.
This invention'broadly refers to an arrangement for translating mechanical movements into corresponding electrical variations and is more particularly directed to means for transforming the vibrations of the stylus of a phonograph into electrical variations for reproduction by a loudspeaker. Such devices have become known under the name of phonograph pick-up devices and are so constructed that they can be attached to an ordinary phonograph, in an easy manner. They present important advantages as,
compared to the direct reproduction by the stylus acting on the phonograph diaphragm,
i which primarily consists of a higher quality of the tones reproduced.
One object of this invention is to receive equal reproduction of the notes of the entire musical scale to be reproduced.
Another object of this invention is to provide combined electro-static and electromagnetic pick-up means in such a Way as .to
secure equal quality of reproduction of the entire band of frequencies to be translated.
The invention is more fully and specifical- 1y described by the following detailed disclosure taken in reference to the agcompany" ing drawings of which Fig. l is a sectional elevation of the pickup device constructed in accordance with my invention. A
a Fig. 2 is a front elevation of the device with the sound box cover, stylus, stylus lever, and part of the diaphragm removed.
Fig.3 is a diagram of connections.
In gramophone pickup and amplifying devices using the electro-magnetic principle, it has been found that the relationship between the response and frequency is not linear and usually there is a considerable falling ed in the response of the pick-up at the lower frequencies, whereas in those using the electrostatic principle there is a considerable falling off atthe' higher frequencies The invention consists of the arrangement of an electro-magnet, preferably annular in shape, having an annular rich as one pole and a centre boss as the other pole, between which poles is disposed a thin annular Winding, and a j a stretched steel diaphragm mounted in close in my U. S. application Serial No. 268,006,
filed April 6, 1928. In this combined arrangement the principles of the electro-magnetic and the electrostatic devices may be used simultaneously.
Referring first to Fig. 3, in the present cir- 0 cuit arrangements the electrostatic portion of the pick-up connected in the usual manner wherein the centre boss 1 of the electro-magnet 6 constitutes the back electrode and is connected to the positive pole 0f the polarizing battery 2 which is preferably variable and which is at the same time the'anode battery for the amplifying three-electrode tubes V and V arranged in resistance coupling connection. The magnetic diaphragm 3 is 0on I nected to the grid of an amplifying valve V and a coupling resistance 23' is connected between the said grid and the grid bias lead 11. The winding 5 on the electro-magnet 6 is connected through a battery 7 to the primary 8 of a step-up transformer 9 and the secondary 10 of the transformer is connected through the variable condenser 18 to the grid 4 at the minus grid bias lead 11 of the tube V A choke 12 is preferably connected in the lead 13 between the diaphragm 3 and the grid of the valve V and a resistance 14 is included in the circuit of the anode of the said valve, forming togetherwith a further lead resistance 15 and a condenser 21 the normal resistance coupling element between the tubes V and V 22 is a heating battery for the tubes and 23 is a grid biasing battery. 24 represents a loudspeaker inserted in the,
anode circuit of the last tube for reproduction of the sound vibrations of diaphragm3. 19 is a by-pass condenser bridging the part of resistance 20 inserted in the electrostatic pick-up circuit.
The action of the circuit is as follows Movements of the needle 16 actuated by variation of the grooves in the gramophone record cause-the stylus 17 to actuate the diaphragm 3 thereby varying the distance between the diaphragm and the boss 1 which constitutes the back electrode and thecentre pole piece. This movement has,two efiects: Firstly it causes a variation in capacity between the two electrodes represented by the pole-piece and the diaphragm, thereby producing an alternating E. M. F. across the resistance 23' connected between the grid and negative grid bias lead of the first amplifying tube V secondly the movement causes the flux in the electro-magnet 6, formed in the winding 5' and the pole piece 1 producing an alternating E. M. F. across the primary 8 of the transformer 9 which is transferred to the grid of the tube V through the variable condenser 18. The object of the introduction of the choke 12 in the lead of'the grid of tube V to the diaphragm 3 is. to prevent the shunting of the higher frequencies which are produced by two systems may the electro-ma manner the ob ect of the introduction of the etic system, and in a similar polarizing potential tapped from the potentiometer 20in the case of the electrostatic system and by the variable resistance 21 in the primary circuit of the electro-magnetic system. The actual values of the capacities of the variable condenser 18 and the choke 12 depend on the constants of the pick-up device itself.
Referring to the structural embodiment of the pick-up device shown by Figures 1 and 2, similar numerals refer to similar elements. 4 is the metallic tubular extension for connection with a horn or the like when using the device as an ordinary gramophone, which is connected to a terminal 24 serving for connectionto ground. 25 and 26 are terminals servingfor connection to the iron core 6 and the diaphragm 3, respectively and 27 and 28 are binding posts serving for connection with the terminals of the magnet coil 5. A
What I claim to be secured by Letters Pat- 'ent of the United States is;
luAn arrangement for translating me chanical movements into corresponding electrical variations comprising a flexible diaphragm subject .to said movements, an electric circuit producing a magnetic field associated with said diaphragm, a further .electric circuit including a capacity element, an electrode of said capacity element including said diaphragm, and means forcombining the electric variations occurring in said electric circuits due to the movement ,of dia phragms in a common translating device.
e varied by means of the diaphragm, means connecting said diaphragm to said stylus for imparting to it said J movements, an electric circuit linked with a magnetic field associated with said diaphragm, a further electric'circuit including a capacity element of which said diaphragm is a part, and means for combining the electric variations occurring in said electric ,circuits due to the movement of said diaphragm to a common translating device.
3. An arrangementfor translating the movements of the stylus of a phonograph into electrical variations, comprising a flexible diaphragm, means connecting said diaphragm to said stylus for imparting to it said movements, an electric circuit linked with a magnetic field associated with said diaphragm, a further electric circuit including a capacity element of which said diaphragm is a part, an electric discharge device having main electrodes and a control electrode, means to simultaneously apply varying. potential to said control electrode in accordance with electric variations in said electric circuits, and an electric reproducing device actuated. by the output circuit of said discharge device.
' 4. An arrangement for translating the movements of the stylus of a phonograph into electrical variations, comprising a flexible diaphragm of magnetic material subject'to said movements, pole pieces arranged opposite said diaphragm, an electric circuit including a winding arranged on said pole pieces, a further electric circuit including a capacity element constituted bysaid diaphragm and said pole pieces and means for combining electric varia ions in said electric circuits in a common translating device.
- 5. An arrangement for translatin the movementsof the stylus of a phonograp 1 into electrical variations, comprising a flexible diaphragm of'magnetic material subject to said movements, pole pieces arranged opposite said diaphragm, an electric circuit including a winding arranged on said pole pieces, a further electric circuit including a capacity element constituted by said diaphragm and said pole pieces, an electric discharge device having main electrodes and a control electrode, means to simultaneously apply varying potential to said control electrode in accordance with electric variations in said electric circuits, and an electric reproducing device actuated by the output circuit of said discharge device.
6. An arrangement as in claim 5, means for providing a variable polarizing voltage for 2. An arrangement for translating the electrical blocking means are provided in one movements of the stylus of a phonograph into circuit for the single resulting current for 65 electrical variations, comprising a flexible preventing variations of certain frequencies translated by one of the elements from being short-circuited by the other element.
8. An arrangement for translating mechanical movements into corresponding electrical variations comprising a flexible diaphragm subject to said movements, an electric circuit producing a magentic field associated with said diaphragm, a further electric circuit including a capacity element, an electrode of said capacity element including said diaphragm, means for combining the electric variations occurring in said. electric circuits due to the movement of diaphragms in a common translating device and means for varying the components of the single elec tric currents produced by said variations of said electric and magnetic field.
9. ln an arrangement for translating the mechanical movements of a stylus into corresponding electrical variations, comprising a moving member adapted for influencing an electrostatic and a magnetic field, means for transforming the variations of said electrostatic and said magnetic field into asingle electric current variation, and means for relatively varying the components of said electrostatic and said magnetic field producing said single electric current.
In testimony whereof I affix my signature.
HUMFREY ANDREWES.
US296059A 1928-02-24 1928-07-28 Electric pick-up device Expired - Lifetime US1732427A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1732427X 1928-02-24

Publications (1)

Publication Number Publication Date
US1732427A true US1732427A (en) 1929-10-22

Family

ID=10889435

Family Applications (1)

Application Number Title Priority Date Filing Date
US296059A Expired - Lifetime US1732427A (en) 1928-02-24 1928-07-28 Electric pick-up device

Country Status (1)

Country Link
US (1) US1732427A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423662A (en) * 1944-09-08 1947-07-08 Philco Corp Phonograph pickup device
US2519810A (en) * 1947-12-05 1950-08-22 Jose W Acosta Electrostatic sound reproducer
US2548211A (en) * 1945-12-04 1951-04-10 Rca Corp Sound reproducing system
DE1068026B (en) * 1959-10-29 Bordeaux Marcel Jean-Marie Ghidone (Frankreich) Arrangement for scanning records by means of a scanning needle, the vibrations of which act on two separate transducers
US2973504A (en) * 1951-03-26 1961-02-28 Robert J Bobber Sonic echo system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068026B (en) * 1959-10-29 Bordeaux Marcel Jean-Marie Ghidone (Frankreich) Arrangement for scanning records by means of a scanning needle, the vibrations of which act on two separate transducers
US2423662A (en) * 1944-09-08 1947-07-08 Philco Corp Phonograph pickup device
US2548211A (en) * 1945-12-04 1951-04-10 Rca Corp Sound reproducing system
US2519810A (en) * 1947-12-05 1950-08-22 Jose W Acosta Electrostatic sound reproducer
US2973504A (en) * 1951-03-26 1961-02-28 Robert J Bobber Sonic echo system

Similar Documents

Publication Publication Date Title
US1535538A (en) Vibratory system
US1822758A (en) System for transmitting and amplifying vibratory currents and movements
GB361976A (en) Improvements in or relating to electro-acoustic converting devices such as loud speakers
US2843671A (en) Feed back amplifiers
US1732427A (en) Electric pick-up device
US2351008A (en) Method of and means for neutralizing inductive disturbances in magnetic reproducers
US2568797A (en) Microphonic suppression system for electric phonographs
US1645282A (en) Loud-speaking telephone
US1937602A (en) Reproducing circuit
US2634335A (en) Magnetic recording system with negative feedback system
US3061675A (en) Loud speaker improvement
US2030574A (en) Electrical reproducer
US2105167A (en) Sound recording and reproducing apparatus
US1834820A (en) Electrodynamic sound reproducing system
US1632332A (en) Electromagnetic sound reproducer
US2030573A (en) Electric control
US1790636A (en) Locally controlling radio receiving apparatus
US1733232A (en) Electrodynamic sound-reproducing system
US2162875A (en) Dynamic expansion circuit
US1743749A (en) Electroresponsive device
US2093664A (en) Acoustic device
US2328836A (en) Loud-speaker and circuit therefor
US2563882A (en) Magnetic recording system
US2579125A (en) System for the reproduction of magnetic records
US2592313A (en) Signal volume varying system