Abstract: Provided is a composite diaphragm which includes a base layer and at least a graphyne including layer. The base layer has a central portion and a peripheral portion disposed at the periphery of the central portion. The graphyne including layer is disposed on the surface of the base layer. As graphyne is a lightweight and highly rigid material with a two-dimensional structure, composite diaphragms made of graphyne manifest characteristics, such as high stiffness, high toughness and low density, and thus achieve high practicability, such as high durability and high capability of producing high-definition tone.

Abstract: A portable electronic device is formed of a system circuit, a battery, a normally open switch, and a reset unit. The system circuit includes a processor. The normally open switch is electrically connected with the battery. The reset unit is electrically connected with the system circuit, the battery, and the normally open switch and includes a reset switch and a control circuit. The control circuit is electrically connected with the reset switch. When the normally open switch is continuously conducted, electric energy accumulated in the control circuit reaches a predetermined threshold potential to cut of the reset switch to further stop the battery from supplying electric energy for the system circuit.

Abstract: A vent structure for electro-acoustic product includes a plastic member shaped like a tube and defining an opening, and a ventilation layer bonded to the plastic member using an insert molding technique and fully covered over the opening. Thus, the ventilation layer of the vent structure is more moisture-heat resistant in the environment and will not drop from the plastic member easily.

Abstract: A laser welded speaker, including a lower cover, an upper cover fitting with the lower cover, a frame arranged on the lower cover, a lower piece arranged at a bottom of the frame, a magnet arranged in the middle of the lower piece, a pole piece arranged on the magnet, a vibration plate arranged on the frame, and a voice coil fixedly arranged on the vibration plate, the frame is located over the pole piece, the vibration plate is formed of a vibration plate top arc located in the middle and a vibration plate edge located at a periphery, and the vibration plate top arc and the vibration plate edge are fixedly connected together through laser welding. The vibration plate top arc and the vibration plate edge are welded through laser, thereby improving heat-resistant performance of the vibration plate and reducing harm to a human body and environmental pollution.