Crystal unit
First Claim
1. A crystal unit comprising:
- a crystal blank;
an excitation electrode formed on the crystal blank and excites a main vibration of the crystal blank;
a housing that accommodates the crystal blank; and
a sub-vibration electrode formed on the housing and excites a sub-vibration of the crystal blank.
1 Assignment
0 Petitions
Accused Products
Abstract
A crystal unit includes: a crystal blank; an excitation electrode formed on the crystal blank and excites a main vibration of the crystal blank; a housing that accommodates the crystal blank; and a sub-vibration electrode formed on the housing and excites a sub-vibration of the crystal blank.
And a method for inspecting a crystal unit, the method includes: generating a sub-vibration in a crystal blank by applying an input signal to a sub-vibration electrode formed on a housing, which accommodates the crystal blank, via external electrodes which are electrically coupled to the sub-vibration electrode and formed on the outer surface of the housing; obtaining an output of the crystal unit via the external electrodes; obtaining frequency characteristics of impedance between the external electrodes based on the output; and comparing the obtained frequency characteristics with the reference frequency characteristics indicating the quality of the crystal unit.
20 Citations
15 Claims
-
1. A crystal unit comprising:
-
a crystal blank; an excitation electrode formed on the crystal blank and excites a main vibration of the crystal blank; a housing that accommodates the crystal blank; and a sub-vibration electrode formed on the housing and excites a sub-vibration of the crystal blank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. An electronic apparatus comprising:
-
a crystal unit including a crystal blank, an excitation electrode formed on the crystal blank and excites a main vibration of the crystal blank, a housing that accommodates the crystal blank; a sub-vibration electrode formed on the housing and excites a sub-vibration of the crystal blank, and a first external electrode and a second external electrode which are formed on the outer surface of the housing and are electrically coupled to the sub-vibration electrode; a substrate on which the crystal unit is mounted; a first wiring and a second wiring which are formed on the substrate and are electrically coupled to the first and second external electrodes, respectively; and a first terminal and a second terminal which are formed on the substrate and are coupled to end portions of the first and second wirings, respectively.
-
Specification