GB400115A - Improvements in photophones - Google Patents

Improvements in photophones

Info

Publication number
GB400115A
GB400115A GB12819/33A GB1281933A GB400115A GB 400115 A GB400115 A GB 400115A GB 12819/33 A GB12819/33 A GB 12819/33A GB 1281933 A GB1281933 A GB 1281933A GB 400115 A GB400115 A GB 400115A
Authority
GB
United Kingdom
Prior art keywords
mirror
light
unsilvered
lens
grid
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
GB12819/33A
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.)
EMIL BUSCH AG OPTISCHE IND
Original Assignee
EMIL BUSCH AG OPTISCHE IND
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 EMIL BUSCH AG OPTISCHE IND filed Critical EMIL BUSCH AG OPTISCHE IND
Publication of GB400115A publication Critical patent/GB400115A/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)
  • Telescopes (AREA)

Abstract

400,115. Photophones. BUSCH AKT.- GES. OPTISCHE INDUSTRIE, E., 5, Berliner Strasse, Rathenow, Germany. May 2, 1933, No. 12819. Convention date, June 9, 1932. [Class 40 (v).] The transmitted light is projected by a mirror m or lens and is modulated by moving the image of a grating f in accordance with the sound to be transmitted, and the parts of the mirror or lens permanently unused for transmission are used for reception. A fixed grid f is projected, by a mirror k, oscillated by the microphone currents, a lens h and a convex mirror l, on the concave mirror m. An auxiliary grid n on the mirror l consists of unsilvered strips so that the light reflected is modulated by the movement of the mirror k. Unreflected light is absorbed by a. screen o. Received light is reflected by the mirror m through the unsilvered stripes and an opening p in the screen to alight-sensitive cell q. Theco-operating station is located by a telescope r receiving light through the unsilvered grid on the mirror l, a mirror round the opening p and a point s on the mirror m.
GB12819/33A 1932-06-09 1933-05-02 Improvements in photophones Expired GB400115A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE400115X 1908-07-03

Publications (1)

Publication Number Publication Date
GB400115A true GB400115A (en) 1933-10-19

Family

ID=6398216

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12819/33A Expired GB400115A (en) 1932-06-09 1933-05-02 Improvements in photophones

Country Status (2)

Country Link
FR (1) FR400115A (en)
GB (1) GB400115A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290503A (en) * 1963-05-06 1966-12-06 Raytheon Co Light communication system
US3828185A (en) * 1960-12-01 1974-08-06 Singer Co Modulated light communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828185A (en) * 1960-12-01 1974-08-06 Singer Co Modulated light communication system
US3290503A (en) * 1963-05-06 1966-12-06 Raytheon Co Light communication system

Also Published As

Publication number Publication date
FR400115A (en) 1909-07-19

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