Industrial Technology Research Institute

Ching-Iuan Sheu

Chia-Hsin Lin

Yu-Tsung Chiu

Chun-Ti Chen

Yun-Tien Chen

Pin-Win Kauo

Suh-Yuh Cheng

Provided are an actuator, method for manufacturing the actuator, and acoustic transmitter having the actuator. The actuator includes: an elastic metal member having a plurality of curved segments and a plurality of connection segments which constitute a ring structure with a long-axis direction and a short-axis direction; a multilayer piezoelectric member disposed within the ring structure and having a plurality of stacked piezoelectric units along the long-axis direction; and a plurality of coupling members disposed within the ring structure, wherein the multilayer piezoelectric member has two ends in the long-axis direction that are coupled to the connection segments of the elastic metal member in the long-axis direction. A preload stress is imparted to the elastic metal member. A plurality of coupling members having a size corresponding to the preload stress are disposed between the elastic metal member and the multilayer piezoelectric member.

Actuator, method for manufacturing the actuator, and acoustic transmitter

A piezoelectric electroacoustic transducer is disclosed. The piezoelectric electroacoustic transducer includes a diaphragm, a piezoelectric element disposed on the diaphragm, an elastic element connected with and around the diaphragm, a frame around the elastic element and being disassembled so as to adjust an inner-frame projected area of the frame, and a buffer interposed between the elastic element and the frame, wherein the frame has an inner-frame projected area less than a planar projected area of the diaphragm, the elastic element, and the buffer, such that the frame always provides a compressive stress to the diaphragm, the piezoelectric element, the elastic element, and the buffer. The piezoelectric electroacoustic transducer may be implemented as a loudspeaker or a microphone.

Piezoelectric electroacoustic transducer

A piezoelectric electroacoustic transducer is provided, including a three-dimensional structure, at least a piezoelectric element, and at least a membrane. The three-dimensional structure is formed to have a top portion and a side portion integrally connected to the top portion by press molding a plate. The side portion has at least a gap and is separated into a plurality of pillars by the at least a gap. The at least a piezoelectric element is disposed on the top portion, and the at least a membrane covers the at least a gap of the side portion. The piezoelectric electroacoustic transducer in the present disclosure is capable of being implemented as a loudspeaker or a microphone.

An improved PTC electric heating element assembly comprises a heating element of a ceramic material with positive temperature coefficient, two insulating elements with different thickness, and four metal sheets, which are arranged in a stack to firmly join together by a fastening means fixed on the bottom of a container. The opposite sides of the heating element are contacted by metal sheets having electrodes which are connected to electric wires to effectively conduct the heat produced to the container.

Growing community of inventors

Hsinchu, Taiwan

Ching-Iuan Sheu