Electro-acoustic device for alarm watch
AssigneeEbauches S.A.
InventorsRoberto Zafferri, Laurent Grosjean
Life of this patent
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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.
Claims9
An electro-acoustic device, particularly for use with an alarm watch movement, comprising:
- a base;
- solenoid means mounted on said base for creating an oscillating electromagnetic field;
- a lever having a flexible first end mounted on said base, a second end opposite said first end, and a portion including magnetic material located for cooperating with said field and for providing said second end with an oscillating motion while said magnetic material is actuated by said field;
- sound generating means for generating sounds;
- and
- connecting means for rigidly connecting said second end of the lever and said sound generating means to transmit with fidelity the oscillations of the lever to the sound generating means.
Dependencies are inferred from the claim text.