BE477474A - Ameliorations apportees aux microphones - Google Patents

Ameliorations apportees aux microphones

Info

Publication number: BE477474A
Authority: BE; Belgium
Prior art keywords: microphones
Prior art date: 1944-08-15

Application number

Other languages

English (en)

French (fr)

Original Assignee

Bell Telephone Manufacturing Company S.A.

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.)

1944-08-15

Filing date

1947-11-20

Publication date

1948-05-20

1944-08-15 Priority claimed from GB15574/44A external-priority patent/GB594082A/en

1945-08-27 Priority claimed from GB21942/45A external-priority patent/GB616158A/en

1947-11-20 Application filed by Bell Telephone Manufacturing Company S.A. filed Critical Bell Telephone Manufacturing Company S.A.

1948-05-20 Publication of BE477474A publication Critical patent/BE477474A/xx

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers

Landscapes

Engineering & Computer Science (AREA)
Physics & Mathematics (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)
Multimedia (AREA)
General Physics & Mathematics (AREA)
Computer Networks & Wireless Communication (AREA)
Radar, Positioning & Navigation (AREA)
Remote Sensing (AREA)
Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Details Of Audible-Bandwidth Transducers (AREA)
Piezo-Electric Transducers For Audible Bands (AREA)
Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Toys (AREA)

BE477474D 1944-08-15 1947-11-20 Ameliorations apportees aux microphones BE477474A (fr)

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
GB15574/44A GB594082A (en)	1945-08-27	1944-08-15	Improvements in or relating to microphones
GB21942/45A GB616158A (en)	1944-08-15	1945-08-27	Improvements in or relating to electro-acoustic devices
GB2131/47A GB631970A (en)	1944-08-15	1947-01-23	Improvements in or relating to acoustic diaphragms

Publications (1)

Publication Number	Publication Date
BE477474A true BE477474A (fr)	1948-05-20

Family

ID=36952628

Family Applications (3)

Application Number	Title	Priority Date	Filing Date
BE482597D BE482597A (de)	1944-08-15
BE477474D BE477474A (fr)	1944-08-15	1947-11-20	Ameliorations apportees aux microphones
BE478254D BE478254A (fr)	1944-08-15	1947-12-17	Appareils electro-acoustiques

Family Applications Before (1)

Application Number	Title	Priority Date	Filing Date
BE482597D BE482597A (de)	1944-08-15

Family Applications After (1)

Application Number	Title	Priority Date	Filing Date
BE478254D BE478254A (fr)	1944-08-15	1947-12-17	Appareils electro-acoustiques

Country Status (6)

Country	Link
US (2)	US2521744A (de)
BE (3)	BE477474A (de)
CH (2)	CH271258A (de)
DE (3)	DE940654C (de)
FR (3)	FR939111A (de)
GB (1)	GB631970A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102012220006A1 (de) *	2012-11-02	2014-05-08	Robert Bosch Gmbh	Bauelement mit einer mikromechanischen Mikrofonstruktur
USD966235S1 (en)	2019-08-23	2022-10-11	Tymphany Acoustic Technology Limited	Waveguide

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US1141107A (en) *	1902-01-27	1915-06-01	Kellogg Switchboard & Supply	Telephone-transmitter.
US1226886A (en) *	1913-05-13	1917-05-22	New Jersey Patent Co	Telephone-transmitter.
US1352939A (en) *	1917-02-24	1920-09-14	Western Electric Co	Telephone-transmitter
US1869230A (en) *	1929-08-16	1932-07-26	Philadelphia Storage Battery	Electrical element
US1848433A (en) *	1929-09-09	1932-03-08	Magnavox Co	Loud speaker element
US1846351A (en) *	1930-06-13	1932-02-23	Murkham Leonard Walter	Electrodynamic sound-reproducing device
US1943425A (en) *	1931-12-26	1934-01-16	Kellogg Switchboard & Supply	Diaphragm
US2069242A (en) *	1933-01-19	1937-02-02	George A Graham	Electroacoustic energy converting system
US1930328A (en) *	1933-01-25	1933-10-10	Tichenor	Sound reproducing diaphragm
BE402491A (de) *	1933-05-11
GB425558A (en) *	1933-10-26	1935-03-18	Alfred Graham & Co Ltd	Improvements relating to telephones
GB425186A (en) *	1933-11-24	1935-03-08	Alfred Graham & Co Ltd	Improvements relating to telephones
US2043833A (en) *	1934-11-12	1936-06-09	Abraham I Klotz	Protecting framing for brief cases
US2191992A (en) *	1937-03-31	1940-02-27	Int Standard Electric Corp	Telephone transmitter
US2293078A (en) *	1939-12-05	1942-08-18	B A Proctor Company Inc	Microphone
CH220358A (de) *	1940-10-26	1942-03-31	Fides Gmbh	Kapselmikrofon.

0
- BE BE482597D patent/BE482597A/xx unknown
1945
- 1945-11-10 US US627945A patent/US2521744A/en not_active Expired - Lifetime
1946
- 1946-04-03 FR FR939111D patent/FR939111A/fr not_active Expired
- 1946-08-10 CH CH271258D patent/CH271258A/fr unknown
- 1946-10-22 US US704965A patent/US2539488A/en not_active Expired - Lifetime
1947
- 1947-01-23 GB GB2131/47A patent/GB631970A/en not_active Expired
- 1947-11-20 BE BE477474D patent/BE477474A/xx unknown
- 1947-12-02 FR FR57814D patent/FR57814E/fr not_active Expired
- 1947-12-17 BE BE478254D patent/BE478254A/xx unknown
1948
- 1948-01-22 FR FR58186D patent/FR58186E/fr not_active Expired
- 1948-01-23 CH CH263325D patent/CH263325A/de unknown
1950
- 1950-10-01 DE DEST2548A patent/DE940654C/de not_active Expired
- 1950-10-01 DE DEST2537A patent/DE873103C/de not_active Expired
- 1950-10-31 DE DEST2523A patent/DE862768C/de not_active Expired

Also Published As

Publication number	Publication date
FR58186E (fr)	1953-09-29
FR939111A (fr)	1948-11-04
BE478254A (fr)	1948-05-17
BE482597A (de)
US2521744A (en)	1950-09-12
US2539488A (en)	1951-01-30
DE940654C (de)	1956-03-22
GB631970A (en)	1949-11-14
DE873103C (de)	1953-04-09
CH263325A (de)	1949-08-31
DE862768C (de)	1953-01-12
FR57814E (fr)	1953-09-17
CH271258A (fr)	1950-10-15

Publication	Publication Date	Title
FR940982A (fr)	1948-12-29	Perfectionnements aux carrosseries mono-bloc
FR939369A (fr)	1948-11-12	Perfectionnements aux microphones directionnels
FR907290A (fr)	1946-03-07	Perfectionnements aux aéromoteurs
FR992681A (fr)	1951-10-22	Perfectionnements apportés aux cycles
BE477474A (fr)	1948-05-20	Ameliorations apportees aux microphones
FR952403A (fr)	1949-11-16	Perfectionnements aux filtres électriques
FR993000A (fr)	1951-10-25	Perfectionnements aux gazogènes
FR906637A (fr)	1946-01-15	Perfectionnements aux palans
FR950176A (fr)	1949-09-20	Perfectionnements apportés aux dégivreurs
FR939127A (fr)	1948-11-04	Microphones
FR911958A (fr)	1946-07-25	Perfectionnements aux broyeurs
FR994075A (fr)	1951-11-12	Microphone
FR911090A (fr)	1946-06-27	Perfectionnements aux radiophares cadre-antenne
FR907025A (fr)	1946-02-27	Perfectionnements aux dentimètres
FR992903A (fr)	1951-10-24	Perfectionnements aux gyroplanes
FR913770A (fr)	1946-09-19	Perfectionnements aux raboteuses
FR993994A (fr)	1951-11-09	Perfectionnements aux barrières démontables
FR938863A (fr)	1948-10-27	Perfectionnements aux objectifs
FR906591A (fr)	1946-01-14	Perfectionnements aux alternats
FR53524E (fr)	1946-03-04	Perfectionnements aux gazogènes
FR909456A (fr)	1946-05-09	Perfectionnements apportés aux gazogènes
FR916765A (fr)	1946-12-16	Perfectionnements aux manomètres
FR939491A (fr)	1948-11-16	Perfectionnements aux vibrateurs
FR936359A (fr)	1948-07-19	Perfectionnements aux excavateurs
FR918981A (fr)	1947-02-24	Perfectionnements aux pompes