Horology: time measuring systems or devices – Signalling means – Time condition responsive
Patent
1981-08-13
1983-02-22
Roskoski, Bernard
Horology: time measuring systems or devices
Signalling means
Time condition responsive
368 88, 368 73, G04C 2100
Patent
active
043746241
ABSTRACT:
A sound emitting device for an electronic timepiece comprising a disk-shaped permanent magnet; a first yoke and second yoke introducing magnetic flux produced by the magnet and forming, outside the periphery of the magnet, a magnetic gap having the magnetic flux in the vertical direction of the perimeter of the magnet and in the horizontal direction of the disk surfaces of the magnet; a diaphragm carrying, within the magnetic flux of the magnetic gap, a moving coil wound at right angles to the magnetic flux and adapted to be vibrated in response to sound signal currents sent to the moving coil; and a support member supporting the permanent magnet, the yokes as well as the diaphragm at the diaphragm peripheral portion and removably secured at the support frame peripheral portion to a case. Air openings are provided in a part of the support member except where the permanent magnet, yokes and diaphragm are supported to form an air chamber which opens to the back of the diaphragm when the support member is packaged in the timepiece case.
REFERENCES:
patent: 2722681 (1955-11-01), Hersh
patent: 3004153 (1980-08-01), Tiziant
patent: 4090041 (1978-05-01), Mori et al.
patent: 4197697 (1980-04-01), Mori et al.
Citizen Watch Co. Ltd.
Roskoski Bernard
LandOfFree
Sound emitting device for electronic timepiece does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sound emitting device for electronic timepiece, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sound emitting device for electronic timepiece will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1371395