CH646578GA3 - - Google Patents

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Info

Publication number
CH646578GA3
CH646578GA3 CH174481A CH174481A CH646578GA3 CH 646578G A3 CH646578G A3 CH 646578GA3 CH 174481 A CH174481 A CH 174481A CH 174481 A CH174481 A CH 174481A CH 646578G A3 CH646578G A3 CH 646578GA3
Authority
CH
Switzerland
Prior art keywords
khz
buzzer
case
piezoelectric
case back
Prior art date
Application number
CH174481A
Other languages
French (fr)
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
Priority claimed from JP3198380A external-priority patent/JPS56128479A/en
Priority claimed from JP55159950A external-priority patent/JPS5784382A/en
Application filed filed Critical
Publication of CH646578GA3 publication Critical patent/CH646578GA3/fr

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G13/00—Producing acoustic time signals
    • G04G13/02—Producing acoustic time signals at preselected times, e.g. alarm clocks
    • G04G13/021—Details
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
    • G04C21/34—Devices on watches or similar portable timepieces

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

A wristwatch having a piezoelectric buzzer therein includes a watch case and a case back. The piezoelectric buzzer includes a piezoelectric element mounted on the case back inside the watch case. A driver selectively applies signals having a frequency of about 4 kHz to the buzzer. The case back, acting as the vibration plate for the piezoelectric element, is constructed so that the resonance frequency thereof is between 5.5 kHz and 7 kHz.
CH174481A 1980-03-13 1981-03-13 CH646578GA3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3198380A JPS56128479A (en) 1980-03-13 1980-03-13 Electronic watch with piezoelectric buzzer
JP55159950A JPS5784382A (en) 1980-11-13 1980-11-13 Electronic watch with piezoelectric buzzer

Publications (1)

Publication Number Publication Date
CH646578GA3 true CH646578GA3 (en) 1984-12-14

Family

ID=26370495

Family Applications (1)

Application Number Title Priority Date Filing Date
CH174481A CH646578GA3 (en) 1980-03-13 1981-03-13

Country Status (4)

Country Link
US (1) US4459037A (en)
CH (1) CH646578GA3 (en)
GB (1) GB2071883B (en)
HK (1) HK88485A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4926159A (en) * 1988-07-15 1990-05-15 Detex Corporation Apparatus and method for the generation of directionally perceptible sound
US5847648A (en) * 1994-02-10 1998-12-08 Douglas R. Savor Alarm and intermittent alert system for vehicle operation
EP1050860A1 (en) * 1994-07-29 2000-11-08 Kubota Corporation Radio wave receiving signaling device
US5666331A (en) * 1994-09-20 1997-09-09 Rhk Technology, Inc. Alarm clock
US5990797A (en) * 1997-03-04 1999-11-23 Bkk Brands, Inc. Ultraloud smoke detector
DE102015216200A1 (en) * 2015-08-25 2017-03-02 Robert Bosch Gmbh Acoustic sensor with a housing and a membrane element arranged on this housing
EP3798745B1 (en) * 2019-09-30 2022-07-13 ETA SA Manufacture Horlogère Suisse Watch case back with electronic device for wireless charging of a power source

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788060A (en) * 1971-12-09 1974-01-29 Y Kawamura Watch with an electronic buzzer
US3940919A (en) * 1973-10-03 1976-03-02 Citizen Watch Co., Ltd. Electronic wristwatch with electronic sound emitter device
US3943388A (en) * 1974-06-27 1976-03-09 Fred M. Dellorfano, Jr. Electroacoustic transducer of the flexural vibrating diaphragm type

Also Published As

Publication number Publication date
GB2071883B (en) 1983-09-01
GB2071883A (en) 1981-09-23
HK88485A (en) 1985-11-15
US4459037A (en) 1984-07-10

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