Abstract: A chip package includes a substrate, a semiconductor chip, and a thermal conductive structure. The chip package includes a first and a second support structures below the thermal conductive structure. The first and the second support structures connect the substrate and corners of the thermal conductive structure. The thermal conductive structure has a side edge connecting the first and the second support structures. The first and the second support structures and the side edge together define of an opening exposing a space surrounding the semiconductor chip. The first and the second support structures are disposed along a side of the substrate. The first support structure is laterally separated from the side of the substrate by a first lateral distance. The side edge of the thermal conductive structure is laterally separated from the side of the substrate by a second lateral distance different than the first lateral distance.

Abstract: A buzzer includes a base with an upper opening, a vibrating plate fixed on the upper opening of the base, a sound film fixed flatly on the vibrating plate, and an equalizing or whirlpool sound mechanism for transmitting the sound produced by the vibrating plate to enhance dB of medium and high sound of a wide range and to reach far. Thus the buzzer has overwhelming sounding effect and sweet tone.

Abstract: A piezoelectric speaker comprises a drive unit having an auxiliary diaphragm bonded with a piezoelectric transducer element for producing sound thereby and a horn member having a resonance device including a reflection cover defining a plurality of first cusps and a mid plate defining a plurality of second cusps laterally offset with respect of the plurality of first cusps for promoting the sound output in decibel of the speaker.

Abstract: A horn type loudspeaker comprises a drive unit, which is largely the same in structure and features as the conventional drive unit, and a horn member specially designed to effectively minimize its size and weight. Said horn member comprises a hollow disk mounting case with its inner periphery corresponding to a fixing plate of the drive unit engaged thereon, a reflection cover with a tip on its inner surface pointing downwardly towards the central portion of a hole located at the fixing plate connected to the upper inner surface of said mounting case with a plurality of discharge openings uniformly located around the outer periphery so as to overcome the restriction of the standard sizes and have a size and weight small and light enough for miniature applications such as for pocket-size security alarms.