Piezoelectric sensor including overlapping cutout sections in a signal electrode, a first ground electrode, and a second electrode

A piezoelectric sensor comprising:

• a piezoelectric sheet
• a first ground electrode integrally laminated on a first side of the piezoelectric sheet and having a first cutout section;
• a signal electrode integrally laminated on a second side of the piezoelectric sheet and having a third cutout section;
• and
• a second ground electrode integrally laminated on the signal electrode so as to be electrically insulated from the signal electrode and having a second cutout section, wherein
• the cutout sections of the signal electrode, the first ground electrode, and the second ground electrode are at least partially overlapped with one another in a thickness direction of the piezoelectric sheet, and
• a portion of the piezoelectric sheet exposed through a portion where the cutout sections of the signal electrode, the first ground electrode, and the second ground electrode are overlapped with one another in the thickness direction of the piezoelectric sheet serves as an exposed section, wherein:
• the first cutout section of the first ground electrode, the second cutout section of the second ground electrode, and part of the signal electrode are at least partially overlapped with one another in the thickness direction of the piezoelectric sheet and this overlapped portion serves as a signal electrode connecting section;
• the third cutout section of the signal electrode, part of the first ground electrode, and part of the second ground electrode are at least partially overlapped with one another in the thickness direction of the piezoelectric sheet and this overlapped portion serves as a ground electrode connecting section;
• and
• the piezoelectric sensor further comprises:
• a signal electrode piercing terminal having a claw stuck into the signal electrode connecting section so as to be electrically connected to the signal electrode and a protruded connecting section protruding outward from a peripheral edge of the piezoelectric sheet, and
• a ground electrode piercing terminal having a claw stuck into the ground electrode connecting section so as to be electrically connected to the first ground electrode and the second ground electrode and a protruded connecting section protruding outward from the peripheral edge of the piezoelectric sheet.