A keyboard device includes a key structure, a base plate and a switch circuit board. The switch circuit board includes a soft covering element. The key structure includes a keycap and a stabilizer bar. The stabilizer bar is connected with the keycap and the soft covering element. The soft covering element is disposed on the switch circuit board. An accommodation space is formed between the soft covering element and the switch circuit board. The stabilizer bar is inserted into the accommodation space and connected with the switch circuit board. The stabilizer bar and the base plate are made of metallic material. Since the stabilizer bar and the base plate are separated by the switch circuit board, the keyboard device is capable of reducing noise.

A keyboard device includes a key structure, a base plate and a switch circuit board. The switch circuit board includes a soft covering element. The key structure includes a keycap and a stabilizer bar. The stabilizer bar is connected with the keycap and the soft covering element. The soft covering element is disposed on the switch circuit board. An accommodation space is formed between the soft covering element and the switch circuit board. The stabilizer bar is inserted into the accommodation space and connected with the switch circuit board. The stabilizer bar and the base plate are made of metallic material. Since the stabilizer bar and the base plate are separated by the switch circuit board, the keyboard device is capable of reducing noise.

A production process for sintering a nickel layer on an aluminum sheet, and to prepare an aluminum sheet with a nickel layer, which can be directly used for tinning and soldering. A fuse that has a sheet-shaped fuse body, the width of the fuse body does not exceed 2 mm, and the thickness of the fuse body does not exceed 0.2 mm. The fuse has a plurality of adjustment holes and/or adjustment grooves are provided in the fuse body. In one embodiment, the fuse body and the corresponding external circuit are integrally formed. In the fuse, welding platforms are protruded at both ends of the fuse body, respectively, and the width of the welding platform is greater than the width of the fuse body.

A data entry and/or operating system, particularly a keyboard, also a POS keyboard, includes a lower part and an upper part as well as at least one circuit board and at least one retainer plate, the retainer plate lying on the lower part. One or more bushings are integrated for the purpose of connecting the circuit board to the retainer plate. The upper part is formed from a rubber mat having keys, and the stability of the keyboard is assured by the circuit board, bushing and metal retainer sheet. The lower part is connected to the upper part in a sealed manner.