GB728842A - Improvements in or relating to microphones - Google Patents

Improvements in or relating to microphones

Info

Publication number
GB728842A
GB728842A GB2021352A GB2021352A GB728842A GB 728842 A GB728842 A GB 728842A GB 2021352 A GB2021352 A GB 2021352A GB 2021352 A GB2021352 A GB 2021352A GB 728842 A GB728842 A GB 728842A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
aug
crystal
drive pins
diaphragms
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
Application number
GB2021352A
Inventor
Wolfgang Bial
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.)
ROTHERMEL Ltd
Original Assignee
ROTHERMEL Ltd
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 ROTHERMEL Ltd filed Critical ROTHERMEL Ltd
Priority to GB2021352A priority Critical patent/GB728842A/en
Publication of GB728842A publication Critical patent/GB728842A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/02—Microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

728,842. Microphones. ROTHERMEL, Ltd. Aug. 28, 1953 [Aug. 11, 1952], No. 20213/52. Class 40 (4). A piezo-electric microphone comprises two conical diaphragms 1, 2 with a rectangular, twistertype crystal 11 located therebetween, two diagonally opposite corners of the crystal being directly attached to one diaphragm, while the remaining corners are attached by drive pins 9 to the other diaphragm. The diaphragms are of different size and are mounted by their flanges 3, 7 on opposite faces of an insulated annulus 8 formed of paper impregnated with synthetic resin. To avoid contact with the drive pins, diaphragm 2 is formed with localized bulges 12. In a modification, felt discs 14 are inserted to effect damping and to reduce the internal air space. Glue is employed to secure the various parts together.
GB2021352A 1952-08-11 1952-08-11 Improvements in or relating to microphones Expired GB728842A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2021352A GB728842A (en) 1952-08-11 1952-08-11 Improvements in or relating to microphones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2021352A GB728842A (en) 1952-08-11 1952-08-11 Improvements in or relating to microphones

Publications (1)

Publication Number Publication Date
GB728842A true GB728842A (en) 1955-04-27

Family

ID=10142293

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2021352A Expired GB728842A (en) 1952-08-11 1952-08-11 Improvements in or relating to microphones

Country Status (1)

Country Link
GB (1) GB728842A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2276513A (en) * 1993-03-25 1994-09-28 Charles William Turner Ultrasonic transducer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2276513A (en) * 1993-03-25 1994-09-28 Charles William Turner Ultrasonic transducer
GB2276513B (en) * 1993-03-25 1996-11-13 Charles William Turner Transducer for airborne ultrasound

Similar Documents

Publication Publication Date Title
ES462476A1 (en) Piezoelectric high polymer, multilayer electro-acoustic transducers
GB670868A (en) A filter for sound vibrations and a microphone and telephone provided therewith
GB1352407A (en) Electrostatic electroacoustic transducer
ES8204902A1 (en) Electro-acoustic transducers
GB728842A (en) Improvements in or relating to microphones
GB1048602A (en) Improvements relating to moving coil loudspeakers and the like
GB451178A (en) Improvements in loud speakers
GB626623A (en) Improvements in and relating to loud speakers
US2563452A (en) Lotjd-speakek unit
GB290710A (en) Improvements in or relating to diaphragms for loudspeakers and like sound-reproducing devices
US1182078A (en) Sound-box diaphragm.
JPS6057293U (en) speaker unit
GB755801A (en) Improvements in or relating to pick-ups comprising two or more record needles which are externally damped
JPS5593397A (en) Vibration plate for speaker
GB778167A (en) Improvements in ultrasonic probes
JPS52154623A (en) Sound diaphragm
GB501152A (en) Improvements in loud speakers
GB700888A (en) Improvements in or relating to loudspeakers and like sound reproducing devices
US1390963A (en) Phonograph-reproducer
US1800449A (en) Diaphragm
GB611179A (en) Improvements in and relating to acoustic instruments, such as loud speakers and directional microphones
GB759236A (en) Improvements in or relating to loudspeakers
GB299822A (en) Improvements in acoustic devices
GB775177A (en) Improvements in and relating to electro-acoustic apparatus
GB587806A (en) Improvements in or relating to valves of wind-operated musical instruments