Piezoelectric element and method for manufacturing same

• Main Authors: WATANABE TETSUYA, TOSHIKAWA KOJI, IWATA KOICHI, SHIMAO KENJI
• Format: Patent
• Language: Chinese; English
• Published: 11.05.2021
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

The invention provides a piezoelectric element with improved crystal impedance and a manufacturing method thereof. The piezoelectric element comprises an AT-cut crystal piece. The plane shape of the AT-cut crystal wafer is quadrilateral. The side surfaces that intersect the Z' axis of the crystal include a predetermined first surface, a predetermined second surface, and a predetermined third surface. The crystal piece includes, in order, a first surface in which the X-axis of the crystal is used as a rotation axis and the main surface is rotated by 4 DEG +/-3.5 DEG; a second surface in which the X-axis of the crystal is used as a rotation axis and the main surface is rotated by-57 DEG +/-5 DEG; and a third surface in which the main surface is rotated by-42 DEG +/-5 DEG with the X-axis of the crystal as a rotation axis. The crystal piece is at the first side of the two sides parallel with Z' axis, and is connected and fixed to the container through a conductive adhesive. The two corners of the crystal piece on