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CH634456B - ACOUSTIC TRANSDUCER. - Google Patents

ACOUSTIC TRANSDUCER.

Info

Publication number
CH634456B
CH634456B CH222580A CH222580A CH634456B CH 634456 B CH634456 B CH 634456B CH 222580 A CH222580 A CH 222580A CH 222580 A CH222580 A CH 222580A CH 634456 B CH634456 B CH 634456B
Authority
CH
Switzerland
Prior art keywords
diaphragm
watch
excitation device
fixed
transducer
Prior art date
Application number
CH222580A
Other languages
French (fr)
Other versions
CH634456GA3 (en
Inventor
Claude Clement
Original Assignee
Fontainemelon Horlogerie
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 of CH634456B publication Critical patent/CH634456B/en
Application filed by Fontainemelon Horlogerie filed Critical Fontainemelon Horlogerie
Priority to CH222580A priority Critical patent/CH634456B/en
Priority to FR8105269A priority patent/FR2478928A1/en
Priority to DE19813110189 priority patent/DE3110189A1/en
Priority to JP3803381A priority patent/JPS56160680A/en
Priority to GB8108692A priority patent/GB2073544A/en
Publication of CH634456GA3 publication Critical patent/CH634456GA3/fr

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/02—Constructional details

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Electric Clocks (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Surgical Instruments (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

The transducer is particularly useful in a watch. The emission of acoustic waves is caused by vibration of a thin diaphragm 8 occupying virtually the whole of the bottom of the watch case 1. The electromagnetic diaphragm excitation device 10 is disposed at an off-centre position. This not only makes it possible to operate with a small air gap, providing good electromagnetic coupling and therefore a good output, but it also makes it possible to produce a large vibration amplitude at the centre of the diaphragm 8 and therefore a high level of sound intensity for an entirely reasonable rate of consumption. The diaphragm 8 is fixed in a ring 6 which carries the excitation device 10 and which is fixed to the support frame structure 5 of the watch. This modular construction facilitates fitting and interchangeability of the electro-acoustic transducer. <IMAGE>
CH222580A 1980-03-21 1980-03-21 ACOUSTIC TRANSDUCER. CH634456B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CH222580A CH634456B (en) 1980-03-21 1980-03-21 ACOUSTIC TRANSDUCER.
FR8105269A FR2478928A1 (en) 1980-03-21 1981-03-13 ELECTRO-ACOUSTIC TRANSDUCER
DE19813110189 DE3110189A1 (en) 1980-03-21 1981-03-17 "ELECTRO-ACOUSTIC CONVERTER"
JP3803381A JPS56160680A (en) 1980-03-21 1981-03-18 Electroacoustic transducer
GB8108692A GB2073544A (en) 1980-03-21 1981-03-19 Electro-acoustic transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH222580A CH634456B (en) 1980-03-21 1980-03-21 ACOUSTIC TRANSDUCER.

Publications (2)

Publication Number Publication Date
CH634456B true CH634456B (en)
CH634456GA3 CH634456GA3 (en) 1983-02-15

Family

ID=4228794

Family Applications (1)

Application Number Title Priority Date Filing Date
CH222580A CH634456B (en) 1980-03-21 1980-03-21 ACOUSTIC TRANSDUCER.

Country Status (5)

Country Link
JP (1) JPS56160680A (en)
CH (1) CH634456B (en)
DE (1) DE3110189A1 (en)
FR (1) FR2478928A1 (en)
GB (1) GB2073544A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443667A (en) * 1982-01-11 1984-04-17 Bell Telephone Laboratories, Incorporated Electromagnetic transducer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH896868A4 (en) * 1968-06-17 1972-11-15

Also Published As

Publication number Publication date
FR2478928A1 (en) 1981-09-25
DE3110189A1 (en) 1982-02-18
JPS56160680A (en) 1981-12-10
CH634456GA3 (en) 1983-02-15
GB2073544A (en) 1981-10-14

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Legal Events

Date Code Title Description
PLX Patent declared invalid from date of grant onwards