Quartz resonator of small dimensions
AssigneeETA SA Manufacture Horlogere Suisse
InventorsSilvio Dalla Piazza, Thomas Lüthi, Bruno Studer
Life of this patent
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Abstract
The invention concerns a piezoelectric resonator (10), intended to be packaged in a case, including a base (12) formed of a first fixing zone (121), a second central mechanical uncoupling zone (122) and a third zone (123) opposite to the first fixing zone. At least two vibrating arms (13a, 13b) extend from said third zone, on each of which at least one groove (141a-144a, 141b-144b) is formed on at least one of the top or bottom faces of the arms. The resonator is characterised in that the base is provided with a hole (15) through the second central mechanical uncoupling zone.
Claims18
A piezoelectric resonator, packaged in a case, including a base formed of a first fixing zone, a second central mechanical uncoupling zone and a third zone opposite to the first fixing zone, at least two vibrating arms extending from said third zone, on each of which at least one groove is formed on at least one of the top or bottom faces of the arms, wherein the base is provided with a hole through the second central mechanical uncoupling zone,
- and wherein said hole has a polygonal shape, at least two sides of which form an angle minimising the visualization of the crystalline planes during etching.
A piezoelectric resonator, packaged in a case, including a base formed of a first fixing zone, a second central mechanical uncoupling zone and a third zone opposite to the first fixing zone, at least two vibrating arms extending from said third zone, on each of which at least one groove is formed on at least one of the top or bottom faces of the arms, wherein the base is provided with a hole through the second central mechanical uncoupling zone, and
- wherein said hole has a polygonal shape the sides of which are cut so as to minimise the visualization of the crystalline planes of the piezoelectric resonator.
Dependencies are inferred from the claim text.