Abstract: Speaker systems having simple structure, high output power, and desired directivity are disclosed. In one embodiment, a speaker system includes a first sound emission surface that emits a first sound in a first direction and a second sound emission surface that emits a second sound in a second direction that intersects with the first direction at a predetermined angle. The first and second sounds include at least sounds respectively generated from a common first signal source and different in phase from each other.

Abstract: An array speaker system includes a plurality of speaker units that respectively emit sounds in accordance with an input signal and an outer casing that supports the plurality of speaker units. Each speaker unit can be provided with a speaker operable to vibrate a vibrator in accordance with the signal, and a cavity back box that supports the speaker. The cavity back box forms a rear space with the vibrator on the opposite side with respect to the sound emission surface. The array speaker system thus constructed can emit a high power sound with a simple structure and improved stability in acoustic properties.

Abstract: In a waterproof connector and a method for the same, the waterproof connector includes a plurality of electrically conductive terminals, an electrically insulating base, an electrical wire, a hollow cylinder and a cladding. The electrically insulating base has a receiving section. The electrical wire has a plurality of cores. Each core is connected to one end of each electrically conductive terminal. The hollow cylinder is connected to the receiving section and located to one side of the electrical wire. The cladding is used to cover the receiving section, the hollow cylinder, the core and one end of electrically conductive terminal. Further, the present invention provides a method for manufacturing the waterproof connector so as to enhance the yield rate and prevent the penetration of moisture.

Abstract: An adjustable buckling structure for connectors includes a connecting body, two buckling devices and two adjusting rods. The connecting body has a retaining portion formed on each lateral side. Two buckling devices are pivotally connected to two lateral sides of the connecting body, respectively. Each adjusting rod has an acentric section and two rod ends. Each buckling device includes a first and a second linkages. The first linkage has one end pivotally connected to the connecting body and includes a hook formed on the other end thereof. The second linkage has one end pivotally connected to the first linkage and includes a through hole formed on the other end. The adjusting rod is disposed in the through hole with the two rod ends protruded out from the through hole.

Abstract: A waterproof structure applied to an alternating current plug and an alternating current socket includes a plug body and a socket body. The plug body has an inserting portion, a covering portion formed thereon, a limiting portion formed between the plug body and the covering portion, and a washer positioned at one end of the limiting portion to be adjacent to the inserting portion. The socket body has an opening relative to the inserting portion for insertion, and a receiving portion formed thereon suitable for the covering portion to be engaged. The structure will not only be more stable than before to prevent separation occurred by an external force, but also be waterproof equally.