PIEZOELECTRIC VIBRATING REED AND PIEZOELECTRIC DEVICE

Japanese Patent JP3767425

B2

PROBLEM TO BE SOLVED: To provide a piezoelectric vibrating reed capable of realizing its high reliability and improved yield wherein since the width of its lead passing its lead extracting portion is widened substantially, the electrical resistance of the film of its lead can be so reduced without increasing the film thickness thereof, and its enough continuity in its step is so secured, and further, the breaking of its electrode film, etc., can be so avoided as to eliminate the variation of its CI values and obtain its stable vibrating characteristic.
SOLUTION: A crystal vibrating reed 10 has a thin-wall excitation portion 13 and a thick-wall reinforcing-frame portion 14 formed in the periphery of the excitation portion 13 which are generated by recessed portions 12a, 12b formed in both the front and rear principal surfaces of an AT-cut crystal element piece 11. Excitation electrodes 21a, 21b are connected respectively with corresponding extract electrodes 22a, 22b formed in the longitudinal end portion of the reinforcing-frame portion, via respective leads 23a, 23b so laid as to get over the step between the reinforcing-frame portion and the excitation portion. In the step, there is formed a lead extracting portion 24 wherein irregularities comprising a plurality of protruding bars 25 are provided along the edges of the portion 24, and the film of the lead 23a is so formed as to pass the lead deriving portion 24.

Hideaki Nakamura

JP2001179209A

April 19, 2006

June 13, 2001

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Seiko Epson Corporation

H03H9/19; (IPC1-7): H03H9/19

JP2000252786A
JP61003513A
JP59183025U
JP2000228618A
JP2057625U
JP56068013A

Akihiko Umeda

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