Abstract A piezo-electric control device more particularly for clockwork. A vibrating rod is mounted at one end by means of a dielectric on the free end of a piezo-electric rod, the other end portion of which is supported by a dielectric and flexible elastic bushing on a support adapted to be secured to the mounting plate of a watch or the like. Electrodes are applied to the piezo-electric rod, to transmit a voltage variation corresponding to the oscillating frequency of the vibrating rod to an electronic maintenance oscillator acting on a known device for maintaining vibration of the rod. The resulting device is highly accurate and, because there is no vibration transmitted to the watch casing and wrist band, the timing mechanism is in turn not affected by variable energy transferred from the environment, which would affect the isochronism of the vibrating rod.
Inventors
👤 L Brunet
👤 P Corroyer
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-28 17:44
CPC Classifications
G; G04; G04C; G04C3/00; G04C3/08; G04C3/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
In a piezo-electric frequency control device for clockwork and the like timing systems, a rod of non-circular cross-section and made of piezo-electric material, a vibrating reed fixed to one end of said piezo-electric rod and extending at substantially right angles thereto and with the interposition of a dielectric, a vibration damping block made of flexible, elastic and dielectric material, in which the other end of said rod is inserted and supported, a rigid support to which said block is secured, said support supporting the entire device and adapted to mount the latter on a mechanism using the device, and at least one pair of electrodes secured to opposite faces of said piezoelectric rod along longitudinal generatrices of said rod to collect current generated thereby, said electrodes being at least partially inserted within said vibration damping block.
Claim 2
Dependent Claim
136 words
In a piezo-electric frequency control device for clockwork and the like timing systems, a rod of non-circular cross-section and made of piezo-electric material, a vibrating reed fixed to one end of said piezo-electric rod and extending at substantially right angles thereto and with the interposition of a dielectric, a vibration damping block made of flexible, elastic and dielectric material, in which the other end of said rod is inserted and supported, a rigid support to which said block is secured, said support supporting the entire device and adapted to mount the latter on a mechanism using the device, and at least one pair of electrodes secured to opposite faces of said piezoelectric rod along longitudinal generatrices of said rod to collect current generated thereby, said electrodes being at least partially inserted within said vibration damping block.
Claim 3
Dependent Claim
27 words
A device as claimed in claim 1, wherein said piezo-electric rod has a cross-section in the shape of a regular polygon with an even number of sides.
Claim 4
Dependent Claim
39 words
In a device as claimed in claim 2, wherein there are at least two pairs of electrodes secured to mutually opposite siDes of said rod and occupying a definite position with respect to the crystallographic axes of said rod.