US2416082A - Humless electrodynamic pickup - Google Patents

Humless electrodynamic pickup Download PDF

Info

Publication number
US2416082A
US2416082A US548583A US54858344A US2416082A US 2416082 A US2416082 A US 2416082A US 548583 A US548583 A US 548583A US 54858344 A US54858344 A US 54858344A US 2416082 A US2416082 A US 2416082A
Authority
US
United States
Prior art keywords
armature
pickup
pair
frame
humless
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
US548583A
Inventor
Donald F Balmer
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.)
SoundScriber Corp
Original Assignee
SoundScriber 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 SoundScriber Corp filed Critical SoundScriber Corp
Priority to US548583A priority Critical patent/US2416082A/en
Application granted granted Critical
Publication of US2416082A publication Critical patent/US2416082A/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
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/12Gramophone pick-ups using a stylus; Recorders using a stylus

Description

Feb. 18, 1947. BALMER HUM-LESS ELECTRODYNAMIC PICKUP Filed Aug. 8, 1944 2 Sheets-Sheet l r Rm Y a o E V.. T 5. 1: i A m aw fl ic z a Feb. 18, 1947. BALMER 7 2,416,082
HUM-LESS ELECTRODYNAMI C PICKUP Filed Au fa, 1944 2 Shegts-Sheet 2 j I INVE NTOR Jon alcZEBaZ'mer ATT-ORNEY 3 '29 (see Ri 5).
screw rod l6,
gaging recesses 26, 21 which tightly embrace the The intermediate portion of the rear cushion member 23 is provided with a horizontal central slit 28 which is adapted to receive a thin reduced rear horizontal end lug 3| on the Lucite frame The numeral 3 2 indicates a cylindrical stylus rod which is adapted to be vibrated laterally by The disk record 34 recording machine such as was disclosed in the Reissue'Patent No. 22,183, issued to Lincoln Thompson, on' Sept. 22, 1942, and entitled "Appa- 1 I ratus for recording sound on thin disks.
The numeral 38 indicates a central iron core,
about which is wound a moving coil 31, said core I being movable with said coil 31 and filling the 1 entire space therein without air gaps.
The Lucite frame 29 has an intermediate upwardly opening recess 36, a thin rear vertical j section 39, and a thick forward vertical section 40', the combined moving coil 31 and core 38 being tightly cemented between the sections 39, 40 of said Lucite frame 29, as best shown in Fig. 6. Provision is also made of a rectangular top fiat .fibrestrip 4| cemented to the top of the pole pieces I3, l4 and having aninclined side section 42 upon which is mounted an elongated humbucking coil 43, the inclination of which'may be adjusted manually by bending sald'side section 42 with respect to the strip 4| until the hum produced by the lines of force of a stray ma netic-field S. Fpemanating' from a turntable motor 4311 (Fig. 11) or other sourceof electrical disturbances has been compensated for. The hum-bucking coil 43 is providedwith a central iron core 44 similar to the core 38.
It will beunderstood from the above construc- 1 tion that by placing the stationary hum-bucking coil 43 in close proximity to the driven moving pickup con 31 in such a position that both coils will be affected .by the same disturbing stray fields it will only be necessary to'conn'ect the coils v in opposition so as to substantially eliminate all hum and other undesired disturbing noises.
ments of the rear of the pickup armature A, which might cause gurgling noises, provision is made of. an elongated transverse brass wire 45 having a downwardly bowed central portion 46 which engages the rear .armature cushion mem ber'23, the ends 5|); 5| of said wire 45 being rigidly secured to the frame members I I, I2 as by cement,
as shown.
I 7 moving coil 31 which would not be equal in "all directions, as in- Fig.7 9, but would be unbalanced since the axis of such vertical motion would be inclined as indicated in an exaggerated manner by the line 48 in Fig. 10. This would result in the production of gurgling noises unless the 'In order to prevent undesired-vertical move clamped upon opposite faces of'said block, said 2 vertical movements of the: rear"v of the pickup armature were suppressed. I
- An' additional function of the bentwire 45 is 'fication one form in which the invention may be embodied, it is to be understood that this form r a is shown for the purpose of illustration only, and
that the inventionis notto be limited tothe specific disclosure, but may be modified and embodied in various other forms without departing from its spirit.- In short, the invention includes all the modifications and embodiments coming within the scope of the following claims,
Having thus fully described the invention, what is claimed as newand for which it is desired to secure Letters, Patent, is:
- 1, In an electrodynamic pickup for reproducing 7 sounds from the grooves of a phonograph record, 7
a rectangular permanent magnet block, a pair of Z-shaped magnetic frame member clamped upon opposite faces of said block, said frame members having a pair of closely spaced inwardly offset pole pieces, a moving armature located in the air gap between said pole pieces and carrying a pickup coil, a stylus rigidly connected to said armature, yieldable cushions for the front and rear of said armature, and means secured to said frame to engage the cushion at the rear of said armature to restrain the latter from vertical movement wherebysubstantially any tendency to produce gurgling will be prevented.
2. In an electrodynamic pickup for reproduc-' ing sounds from the grooves of "a phonograph record, a rectangularpermanent. magnet block, a pair of- Z-shaped magnetic frame members clamped upon opposite faces of said block, said frame'members having a pair. of closely spaced inwardly offset pole pieces, a light weight elon-- gated rigid moving armature resiliently supported at its sends in a' pair of soft rubber pads carried by said magneticframe members at the front and rear thereof,.and means mounted in said frame to engage the rear pad to restrain the rear of said armature from vertical movement whereby substantially any tergency to produce ord, a rectangular permanent magnet block, a 7
pair of magnetic frame members embracing said block, said frame members having a, pair of closely spaced inwardly offset pole pieces, a pickup-carrying moving armature located in the air gap between saidpole pieces, a'stylus connected with said armature, a yieldable cushion mounted in said frame members for resiliently receiving the'forward portion of saidarmatureto permit'it to vibrate with said stylus, and a curved wire member for holding the rear'of said armature to prevent vertical movements thereof and thus prerecord, a rectangular permanent magnet block, a,
pair of Z-shaped magnetic frame members frame members having a pair' of closely spaced inwardlyoffset pole pieces, a pickup coil carrying moving armature located in the air gap between said pole pieces, a stylus connected with said armature, and a curved brass wire member secured to the outer portions of said frame members for holding the rear of said armature from undesired vertical movements.
5. In an electrodynamic pickup for reproducing sounds recorded in a laterally undulated groove of a phonograph record, a magnetic frame having a pair of pole pieces separated by an air gap, a pickup armature located in said air gap and carrying a, stylus which rides in said groove and is vibrated laterally thereby, and additional means secured to said frame to restrain the rear of said pickup armature from undesirable vertioal vibrations around axes at right angles to the axis of its lateral stylus vibrations whereby any tendency to produce gurgling will be p1evented.
6. In an electrodynamic pickup for reproducing sounds from a laterally undulated groove of a phonograph record, a magnetic frame having a pair of poles separated by an air gap, a pickupcarrying movable armature located in said air gap, a yieldable rear cushion member mounted in said frame, said cushion member having a slit for resiliently embracing the rear of said armature, and means to press downwardly upon the top of said cushion to hold said slit closed .to prevent erratic movements of the rear of said armature.
DONALD F. BALMER.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 2,213,936 Thompson Sept. 3, 1940 2,290,057 Lindenberg July 14, 1942 2,148,796 Barbieri Feb. 28, 1939 2,105,167 Sinnett Jan. 11, 1938 2,275,309 Norton Mar. 3, 1942 FOREIGN PATENTS Number Country Date 416,574 British Sept. 13, 1934 396.875 British Aug. 17, 1933
US548583A 1944-08-08 1944-08-08 Humless electrodynamic pickup Expired - Lifetime US2416082A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US548583A US2416082A (en) 1944-08-08 1944-08-08 Humless electrodynamic pickup

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US548583A US2416082A (en) 1944-08-08 1944-08-08 Humless electrodynamic pickup
GB2191745A GB602114A (en) 1944-08-08 1945-08-27 Improvements in or relating to electrodynamic pickups

Publications (1)

Publication Number Publication Date
US2416082A true US2416082A (en) 1947-02-18

Family

ID=24189488

Family Applications (1)

Application Number Title Priority Date Filing Date
US548583A Expired - Lifetime US2416082A (en) 1944-08-08 1944-08-08 Humless electrodynamic pickup

Country Status (2)

Country Link
US (1) US2416082A (en)
GB (1) GB602114A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535479A (en) * 1947-05-20 1950-12-26 Mallory & Co Inc P R Magnetic pickup
US2542457A (en) * 1946-12-31 1951-02-20 Soundscriber Corp Electrodynamic pickup
US2593633A (en) * 1947-04-29 1952-04-22 Decca Record Co Ltd Electrodynamic phonograph pickup
US2686270A (en) * 1948-12-30 1954-08-10 Rca Corp Electrical input circuit with noise reducing means
US2689275A (en) * 1949-05-04 1954-09-14 Hansen Hans Christian Electrodynamic pickup
US2767253A (en) * 1952-02-01 1956-10-16 Armour Res Found Compensating device for a magnetic recording-reproducing head
US2847506A (en) * 1955-09-15 1958-08-12 Remler Company Ltd Receiver amplifier
US3067295A (en) * 1958-08-04 1962-12-04 Pickering & Co Inc Stereophonic phonograph pick-up device
US3133161A (en) * 1960-01-30 1964-05-12 Neumann Georg Electro-mechanical transducer with negative feedback for the recording and reproduction of sound waves

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB396875A (en) * 1932-04-20 1933-08-17 Albert Edwin Bowyer Lowe Improvements in electromagnetic pick-ups for gramophones
GB416574A (en) * 1933-02-13 1934-09-13 Emi Ltd Improvements in and relating to electromagnetic vibratory devices for use in the electrical reproduction of sound
US2105167A (en) * 1935-10-31 1938-01-11 Rca Corp Sound recording and reproducing apparatus
US2148796A (en) * 1937-05-18 1939-02-28 Amperite Company Phonograph pick-up
US2213936A (en) * 1939-01-13 1940-09-03 Sound Scriber Corp Electrodynamic pickup
US2275309A (en) * 1940-08-03 1942-03-03 Dictaphone Corp Reproducer for electric phonographs
US2290057A (en) * 1938-09-12 1942-07-14 Jr Theodore Lindenberg Sound recording and reproducing mechanism

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB396875A (en) * 1932-04-20 1933-08-17 Albert Edwin Bowyer Lowe Improvements in electromagnetic pick-ups for gramophones
GB416574A (en) * 1933-02-13 1934-09-13 Emi Ltd Improvements in and relating to electromagnetic vibratory devices for use in the electrical reproduction of sound
US2105167A (en) * 1935-10-31 1938-01-11 Rca Corp Sound recording and reproducing apparatus
US2148796A (en) * 1937-05-18 1939-02-28 Amperite Company Phonograph pick-up
US2290057A (en) * 1938-09-12 1942-07-14 Jr Theodore Lindenberg Sound recording and reproducing mechanism
US2213936A (en) * 1939-01-13 1940-09-03 Sound Scriber Corp Electrodynamic pickup
US2275309A (en) * 1940-08-03 1942-03-03 Dictaphone Corp Reproducer for electric phonographs

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542457A (en) * 1946-12-31 1951-02-20 Soundscriber Corp Electrodynamic pickup
US2593633A (en) * 1947-04-29 1952-04-22 Decca Record Co Ltd Electrodynamic phonograph pickup
US2535479A (en) * 1947-05-20 1950-12-26 Mallory & Co Inc P R Magnetic pickup
US2686270A (en) * 1948-12-30 1954-08-10 Rca Corp Electrical input circuit with noise reducing means
US2689275A (en) * 1949-05-04 1954-09-14 Hansen Hans Christian Electrodynamic pickup
US2767253A (en) * 1952-02-01 1956-10-16 Armour Res Found Compensating device for a magnetic recording-reproducing head
US2847506A (en) * 1955-09-15 1958-08-12 Remler Company Ltd Receiver amplifier
US3067295A (en) * 1958-08-04 1962-12-04 Pickering & Co Inc Stereophonic phonograph pick-up device
US3133161A (en) * 1960-01-30 1964-05-12 Neumann Georg Electro-mechanical transducer with negative feedback for the recording and reproduction of sound waves

Also Published As

Publication number Publication date
GB602114A (en) 1948-05-20

Similar Documents

Publication Publication Date Title
US2612566A (en) Magnetic recording and reproducing system
US2751439A (en) Magnetic recording apparatus
US2114471A (en) Sound recording and reproducing system
US3830505A (en) Vertical stabilizer for phonograph arms
JPH07105550A (en) Objective lens driving device
US2469444A (en) Magnetic sound recording and reproducing transducer
CA1071110A (en) Tone arm assembly with vibration control
GB1267142A (en)
FR2368113A1 (en) TRACK-CONTROLLED REPRODUCTIVE TRANSDUCER FOR
US1992893A (en) Combined recording and reproducing device
US3623734A (en) Pick-up device for record players
GB1476913A (en) Magnetic recording and/or reproducing apparatus
GB1282408A (en) Magnetic recording and reproducing apparatus
US2610257A (en) Magnetic record volume control
US3609253A (en) Loudspeaker with improved voice coil suspension
JPH0658417U (en) Optical device
US2612681A (en) Method of making magnetic recording heads
US3896319A (en) Linear motor
US2585913A (en) Magnetic pickup head and mount therefor
GB930367A (en) Stereophonic pick-up having a single stylus
KR950012357A (en) Objective lens driving apparatus, optical pickup apparatus and optical disk recording and reproducing apparatus using the objective lens driving apparatus
US2092884A (en) Signal translating apparatus
US2535065A (en) Galvanometer
ES459643A1 (en) Vibration transmission mechanism for a phonograph
US1828189A (en) Method of recording and reproducing wave frequencies