Patent ID: 7888850
Filing Date: 2011-02-15
Classification: H03H

Abstract:
1. A tuning-fork type piezoelectric unit comprising: a container main body with a concave shape; an electrode pad which is provided inside a concavity of said container main body; a metal bump which is provided on said electrode pad; a tuning-fork type piezoelectric piece in which one principal plane of a tuning-fork base with a pair of tuning-fork arms extended therefrom is bonded to said metal bump by means of a conductive adhesive; and a cover which is joined to an opening end face of said container main body to hermetically seal said tuning-fork type piezoelectric piece, wherein a surface area of an upper surface flat part of said metal bump is smaller than a bottom surface area of said metal bump, wherein said metal bump has a widthwise cross-sectional profile that is substantially constant in a lengthwise direction of said metal bump, and a curved surface on both sides wherein said metal bump is dimensioned and configured such that frequency changes for said tuning-fork type piezoelectric piece are suppressed when said tuning-fork type piezoelectric unit is caused to be dropped.