GB503853A - Improvements in or relating to microphones - Google Patents

Improvements in or relating to microphones

Info

Publication number
GB503853A
GB503853A GB27996/37A GB2799637A GB503853A GB 503853 A GB503853 A GB 503853A GB 27996/37 A GB27996/37 A GB 27996/37A GB 2799637 A GB2799637 A GB 2799637A GB 503853 A GB503853 A GB 503853A
Authority
GB
United Kingdom
Prior art keywords
light
reflecting surface
cathode
source
sound
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
GB27996/37A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co 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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB27996/37A priority Critical patent/GB503853A/en
Priority to US232513A priority patent/US2259511A/en
Publication of GB503853A publication Critical patent/GB503853A/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
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

503,853. Optical microphones. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and BANKS, G. B. Oct. 14, 1937, No. 27996. [Class 40 (iii)] A microphone, i.e. a device for translating sound into electrical variations, comprises an electron discharge device 8, a source of light 5, a reflecting surface 3, means responsive to incident sound for moving said reflecting surface, a second reflecting surface 4, and means for projecting light from said source to said electron discharge device after a plurality of reflections between said reflecting surfaces 3, 4, a plurality of times from the acoustically moved surface 3 before reaching the cathode 7, so that an inertia-free "optical-lever" effect is obtained, a small movement of the said surface 3 producing a large change in the light incident upon the cathode. In the form shown in Fig. 1, the reflecting surface 3 is a sound vibrated diaphragm opposite an opening 2 in a box 1, the light source 5 is slit-like and associated with a lens system 6, and the reflected light is focused on the edge of a slit-like outlet 4b on its way to the cathode 7. In a modification, there is a grating in the path of the light from the source to the reflecting surface 3 and a second grating between this surface and the cathode.
GB27996/37A 1937-10-14 1937-10-14 Improvements in or relating to microphones Expired GB503853A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB27996/37A GB503853A (en) 1937-10-14 1937-10-14 Improvements in or relating to microphones
US232513A US2259511A (en) 1937-10-14 1938-09-30 Microphone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27996/37A GB503853A (en) 1937-10-14 1937-10-14 Improvements in or relating to microphones

Publications (1)

Publication Number Publication Date
GB503853A true GB503853A (en) 1939-04-14

Family

ID=10268600

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27996/37A Expired GB503853A (en) 1937-10-14 1937-10-14 Improvements in or relating to microphones

Country Status (2)

Country Link
US (1) US2259511A (en)
GB (1) GB503853A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7348016B2 (en) * 2002-06-13 2008-03-25 Societe D Exploitation De Produits Pour Les Industries Chimiques Seppic Self-reversible reverse microlatex, process for preparing the same and cosmetic and industrial uses thereof

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2666650A (en) * 1951-02-07 1954-01-19 Macdonell John Sound pickup and reproducing apparatus
US3286032A (en) * 1963-06-03 1966-11-15 Itt Digital microphone
US3433959A (en) * 1966-07-25 1969-03-18 Perkin Elmer Corp Microphone
US4412105A (en) * 1982-03-08 1983-10-25 Muscatell Ralph P Laser microphone
US20150365770A1 (en) * 2014-06-11 2015-12-17 Knowles Electronics, Llc MEMS Device With Optical Component

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7348016B2 (en) * 2002-06-13 2008-03-25 Societe D Exploitation De Produits Pour Les Industries Chimiques Seppic Self-reversible reverse microlatex, process for preparing the same and cosmetic and industrial uses thereof
US7943155B2 (en) 2002-06-13 2011-05-17 Societe D'exploitation De Produits Pour Les Industries Chimiques (Seppic) Self-reversible reverse microlatex process for preparing it and cosmetic and industrial uses thereof

Also Published As

Publication number Publication date
US2259511A (en) 1941-10-21

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