Patent ID: 9236554
Filing Date: 2016-01-12
CPC Classification: H01L,H03H,Y10T

Claim Text:
1. A surface mount type piezoelectric device, comprising: a piezoelectric vibrating piece that includes a vibrator with a pair of excitation electrodes and an extraction electrode extracted from the pair of excitation electrodes, the vibrator vibrating at a predetermined vibration frequency; a base plate that includes one principal surface and another principal surface, the piezoelectric vibrating piece being placed on the one principal surface, a connecting electrode is formed on the one principal surface and being electrically connected to the extraction electrode, a mounting terminal is formed on the another principal surface; and a lid plate that seals the vibrator, wherein at least a part of the mounting terminal includes a first metal film, a second metal film, and an electroless plating film, the first metal film includes a plurality of laminated metal layers formed by sputtering or vacuum evaporation, the second metal film includes a plurality of laminated metal layers, the second metal film being formed to cover the first metal film or being formed at a part of a surface of the first metal film, the second metal film having a different area from the first metal film, and the electroless plating film being formed at least on a surface of the second metal film by electroless plating, wherein the first metal film and the second metal film include a chromium layer, a nickel tungsten layer, and a gold layer, the nickel tungsten layer is formed on a surface of the chromium layer, and the gold layer is formed on a surface of the nickel tungsten layer.