US 9,813,823 B2
Piezoelectric element, and piezoelectric vibrating apparatus, portable terminal, sound generator, sound generating apparatus, and electronic device comprising the piezoelectric element
Hiroshi Suenaga, Kyoto (JP)
Assigned to KYOCERA CORPORATION, Kyoto-Shi, Kyoto (JP)
Appl. No. 15/112,270
Filed by KYOCERA Corporation, Kyoto-shi, Kyoto (JP)
PCT Filed Jun. 27, 2014, PCT No. PCT/JP2014/067192
§ 371(c)(1), (2) Date Jul. 18, 2016,
PCT Pub. No. WO2015/114849, PCT Pub. Date Aug. 6, 2015.
Claims priority of application No. 2014-015703 (JP), filed on Jan. 30, 2014.
Prior Publication US 2016/0337760 A1, Nov. 17, 2016
Int. Cl. H04R 17/00 (2006.01); H04R 1/02 (2006.01); H01L 41/047 (2006.01); H01L 41/09 (2006.01)
CPC H04R 17/005 (2013.01) [H01L 41/0471 (2013.01); H01L 41/0472 (2013.01); H01L 41/0973 (2013.01); H04R 1/026 (2013.01); H04R 17/00 (2013.01); H04R 2499/11 (2013.01); H04R 2499/15 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A piezoelectric element, comprising:
a stacked body in which a plurality of internal electrodes and a plurality of piezoelectric layers are laminated, the stacked body being shaped in a rectangular plate as seen in a plan view;
a plurality of surface electrodes disposed at least on one principal face of the stacked body; and
a plurality of side electrodes disposed on a side face of the stacked body, the plurality of internal electrodes extending to the side face, the plurality of side electrodes electrically connecting the plurality of internal electrodes extending to the side face and the plurality of surface electrodes,
the plurality of internal electrodes each including a first primary electrode having an active region which has a relatively wide rectangular shape and a led-out region whose width is relatively narrow,
a first secondary electrode, the first primary electrodes being disposed in inter-piezoelectric layer regions, the first secondary electrodes being disposed in the inter-piezoelectric layer regions so as to be apart from the led-out regions of the first primary electrodes, and
a second primary electrode, the second primary electrodes being disposed alternately with the first primary electrodes in a stacking direction of the stacked body so as to face the active regions of the first primary electrodes,
an arrangement of a first primary electrode and a first secondary electrode which are located on one principal face side in the stacking direction of the stacked body and an arrangement of a first primary electrode and a first secondary electrode which are located on the other principal face side in the stacking direction of the stacked body being in line-symmetric relation to each other about a widthwise central axis,
both of the led-out region of the first primary electrode and the first secondary electrode being extended to one end face in a longitudinal direction of the stacked body,
the first primary electrode located on the one principal face side and the first secondary electrode located on the other principal face side being connected to a first side electrode located on the one end face, and the first primary electrode located on the other principal face side and the first secondary electrode located on the one principal face side being connected to a second side electrode located on the one end face,
all of the second primary electrodes being extended to the other end face in the longitudinal direction of the stacked body, and being connected to a third side electrode located on the other end face.