Electro-acoustic device for alarm watch
US4258432A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1979 |
| Grant date | Mar 24, 1981 |
| Priority date | — |
| Expiry date | Oct 25, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K9/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electro-acoustic device for an alarm watch includes a lever moved by an oscillating electromagnetic field created by an electromagnet to vibrate a moving element or glass of the watch and produce a sound. The glass is elastically mounted on a sealing ring of the watch. The lever is mounted by one end to the watch and includes a tapered part adjacent the one end which is elastically deformable thereat so that a free end of the lever opposite the one end may vibrate and its fundamental frequency in response to the oscillating electromagnetic field. The free end of the lever carries a stem coupling the lever to the glass and transmitting the oscillating motion of the lever to the glass, which vibrates on the elastic ring to produce the sound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.