Abstract: A directional microphone including a casing and a microphone element is provided. The casing has a front sound reception hole and at least one rear sound reception hole. The microphone element is disposed in the casing. The microphone element has a front sound reception surface and a rear sound reception surface. The front sound reception hole is located on a same side as the front sound reception surface, and the front sound reception hole is aligned with the front sound reception surface. The rear sound reception hole is located on a same side as the rear sound reception surface, but the rear sound reception hole and the rear sound reception surface are misaligned with each other.

Abstract: A speaker includes a casing, a first diaphragm and a second diaphragm. The casing encloses a first sound chamber and a second sound chamber independent of each other. The casing has a dividing wall, and the dividing wall blocks between the first sound chamber and the second sound chamber. The first diaphragm is disposed in the first sound chamber, the second diaphragm is disposed in the second sound chamber, and the vibration frequency of the second diaphragm is higher than the vibration frequency of the first diaphragm.

Abstract: A directional microphone including a casing and a microphone element is provided. The casing has a front sound reception hole and at least one rear sound reception hole. The microphone element is disposed in the casing. The microphone element has a front sound reception surface and a rear sound reception surface. The front sound reception hole is located on a same side as the front sound reception surface, and the front sound reception hole is aligned with the front sound reception surface. The rear sound reception hole is located on a same side as the rear sound reception surface, but the rear sound reception hole and the rear sound reception surface are misaligned with each other.

Abstract: A circumaural earphone including a headband, an adjustment mechanism, a rod, and an earphone module assembled to the rod is provided. The adjustment mechanism disposed at an end of the headband includes a housing and a pivoting ring assembled in the housing to be rotatable about an axis relative to the housing. The rod is disposed rotatably through the pivoting ring and the housing along the axis, wherein the rod and the pivoting ring are adapted to each other structurally for the rod to drive the pivoting ring to rotate about the axis synchronously. The earphone module is disposed on the rod.

Abstract: A circumaural earphone including a headband, an adjustment mechanism, a rod, and an earphone module assembled to the rod is provided. The adjustment mechanism disposed at an end of the headband includes a housing and a pivoting ring assembled in the housing to be rotatable about an axis relative to the housing. The rod is disposed rotatably through the pivoting ring and the housing along the axis, wherein the rod and the pivoting ring are adapted to each other structurally for the rod to drive the pivoting ring to rotate about the axis synchronously. The earphone module is disposed on the rod.

Abstract: A bubble bag manufacturing apparatus is provided. The bubble bag manufacturing apparatus includes a manufacturing apparatus body and a wireless module. The manufacturing apparatus body is configured to perform a machining process on a bubble bag film roll, so as to manufacture a bubble bag. The bubble bag film roll comprises a machine readable medium. The wireless module is disposed to the manufacturing apparatus body, and configured to receive a production information of the bubble bag from an electronic apparatus. The electronic apparatus scans the machine readable medium to obtain the production information, and transmits the production information to the manufacturing apparatus body by wireless transmission. The manufacturing apparatus body determines a production parameter of the bubble bag according to the production information, and manufactures the bubble bag according to the production parameter. In addition, a bubble bag manufacturing method is also provided.

Abstract: An inflatable cushion packaging machine including a housing, a driving mechanism disposed at a front side of the housing, a rolling shaft module disposed at a rear side of the housing, and a friction module is provided. A film roll is mounted to the rolling shaft module, wherein a free end of the film roll is engaged with and moved by the driving mechanism such that the film roll is dragged by the driving mechanism to rotate the rolling shaft module. The friction module assembled to the housing has a friction ring being coaxial with the rolling shaft module and a plurality friction rollers mounted to the friction ring. The friction ring is forced to lean the friction rollers against a side surface of the rolling shaft module and stop the rolling shaft module from rotating while the rolling shaft module not being dragged and rotated by the driving mechanism.