Surface mount type crystal unit

Abstract

An object of the invention is to provide a surface mount oscillator that can suppress a change with the lapse of time in frequency characteristics. A surface mount type crystal unit 1 includes: a framed crystal plate 2 in which an oscillating part 6 having a first excitation electrode 5a and a second excitation electrode 5b on opposite principal surfaces thereof is surrounded by a frame 7, and the oscillating part 6 and the frame 7 are connected by connecting parts 8a and 8b; a base 3; and a cover 4. The surface mount type crystal unit 1 has such a configuration that a first metal film 17 is formed in one area of two areas formed by dividing the principal surface of the frame 7 facing the base 3 at two positions around a circumferential direction of the frame 7, and a second metal film 18 is formed in the other area. The first metal film 17 is electrically connected to the first excitation electrode 5a, and the second metal film 18 is electrically connected to the second excitation electrode 5b. The frame 7 and the base 3 are bonded to each other by a sealing material 20 formed on surfaces of the first metal film and the second metal film, and a gap area 19 between the first metal film 17 and the second metal film 18 is filled with glass 21, thereby hermetically sealing the oscillating part 6.

Dependencies are inferred from the claim text.