Abstract: The disclosure provides a display device. The display device includes a display panel and a vibration generating module. The vibration generating module is attached to the display panel and includes a substrate, a circuit layer, and a plurality of vibrators. The circuit layer and the plurality of vibrators are disposed on the substrate, and the plurality of vibrators are electrically connected to the circuit layer.

Abstract: A locking device includes a locking mechanism and a joint mechanism movably combined thereto. The joint mechanism includes a positioning sleeve, a joint sleeve and a joint spring. The positioning sleeve has a first stop convex part and a second stop convex part. A part of the joint sleeve is sleeved in the positioning sleeve, and respectively extends a fastening part and a third stop convex part. The joint spring butts between the first stop convex part and the third stop convex part, so that the third stop convex part is attached to the second stop convex part. The joint sleeve is configured to be rotated so that the third stop convex part is out of the state of being stopped by the second stop convex part to draw the fastening part closer to the first opening.

Abstract: A machine roller includes a core shaft having an inner hollow space and two opposite open ends communicating with the inner hollow space; and two support axles separately connected to the two open ends of the core shaft. The two support axles are connected to the core shaft by radio-frequency heating the core shaft and then extending the support axles into the inner hollow space via the two open ends. Therefore, the machine roller can reduce weight and be easily manufactured to enable decreased manufacturing cost thereof.

Abstract: A roller for various machines and apparatus includes at least one roller core having a hollow body and two opposite communicable open ends, and at least one end cap joined to at least one of the two opposite open ends of the roller core by way of friction welding. The end cap is provided on one of two opposite sides with an axially outward extended engaging section for inserting into the hollow body of the roller core, and an annular groove is provided around the engaging section. With the above arrangements, the roller can be easily produced at reduced manufacturing cost and having a reduced weight but increased structural strength.

Abstract: The present invention provides an improved roller structure of a business machine, having a side hole naturally formed on both distal sides of a hollow tubular roller body and provided for two sheet side covers to be coupled with the periphery of the side hole at a distal side of the roller body by friction welding, and at least one of the side covers has a ventilation hole for receiving an extended plunger to seal the cover, and a vertical protruding pivot shaft is installed at the center of another side of the two side covers (by an integral formation or a combination of separate components, such that the two pivot shafts can be extended along the direction of the shaft center of the roller body.