Reduced-height piezoelectric device having a piezoelectric resonator and electronic component
View Patent ↗A piezoelectric device includes: a base substrate; an electronic component provided on a first surface of the base substrate; and a piezoelectric resonator that is provided on the first surface of the base substrate without planarly overlapping with the electronic component and have a package base, a mounting surface of the package base having one of a recessed part and a cutout part. In the device, the base substrate includes a resonator-disposing section disposed in a region of the one of the recessed part and the cutout part of the piezoelectric resonator and the resonator-disposing section is a part of the base substrate in plan view and is coupled to a bottom surface of the one of the recessed part and the cutout part.
1. A piezoelectric device, comprising:
a base substrate;
an electronic component provided on a first surface of the base substrate; and
a piezoelectric resonator that is provided on the first surface of the base substrate without planarly overlapping with the electronic component and has a package base, a mounting surface of the package base having one of a recessed part and a cutout part, wherein
the base substrate includes a resonator-disposing section disposed in one of the recessed part and the cutout part of the piezoelectric resonator, the resonator-disposing section being a part of the base substrate and being coupled to a bottom surface of the one of the recessed part and the cutout part.
2. The piezoelectric device according to claim 1 , further comprising:
an external electrode provided on the bottom surface of the one of the recessed part and the cutout part of the package base; and
a terminal provided to the resonator-disposing section of the base substrate and joined to the external electrode with a joining member.
3. The piezoelectric device according to claim 1 , wherein:
the package base includes:
a first substrate disposed as an uppermost layer and having an opening housing a piezoelectric resonator element;
a second substrate disposed as an intermediate layer and sealing the opening; and
a third substrate disposed as a lowermost layer;
the base substrate includes the resonator-disposing section having a planarly projected shape;
the third substrate is formed so as to sandwich the resonator-disposing section of the base substrate in plan view so that the recessed part is formed to the package base; and
the resonator-disposing section of the base substrate is set in the recessed part of the package base.
4. The piezoelectric device according to claim 1 , wherein:
the package base includes:
a one substrate having an opening housing a piezoelectric resonator element; and
an other substrate sealing the opening;
the base substrate includes a pair of the resonator-disposing sections positioned apart from each other;
the one substrate planarly overlaps with both of the pair of the resonator-disposing sections;
the other substrate is provided in a region that is sandwiched between the pair of the resonator-disposing sections of the base substrate, so as to provide a pair of the cutout parts to the package base; and
each of the pair of the resonator-disposing sections of the base substrate is set one of the pair of the cutout parts of the package base.