ZhiJian Hardware

Some friends have such doubts - can dome slices play SMT? Today, I will show you the answer to this question.

Dumplings can be SMT. Dome pieces (also known as metal material shrapnel or metaldome, snapdome) are made of thin (0.05mm-0.1mm thick) and super hard (1 general strength is HV480⑸50 middle) stainless steel plate. The key is used in membrane keys, Small power switches, PCB boards, printed circuit boards, forced boards and other commodities. It has five advantages of stable touch, strong conductivity, stable resilience and outstanding touch.

Due to the excellent on-off characteristics of the dome, it can bring better power switch on and operation effect between staff and equipment. Secondly, the stable resilience of the dome slices (automatic return after pressing and holding) can give the staff a comfortable feeling of shaking. In addition, the long service life of the dome sheet reaches one million touches, which brings the most specific quality application to the main product. According to the needs of different product structures and grades, the dome can be subjected to various surface treatments such as nickel plating, gold plating, and gold plating.

Generally, the basic dome is divided into: annular dome (waist circle/oval), 10-shaped dome, 3-angle dome, rectangular dome, diameter from 3mm to 20mm, the range is from 100g to 600gf, even 6,000gf (the 3-angle shrapnel can only be reached with some unique diameters/raw materials, and it is rarely used). In addition, multiple dome shrapnel can be pressed to a certain position and applied with glue PET caters to them together, and it is convenient and quick to assemble, and there is no doubt about it. For a general board, according to the corresponding PAD (solder layer) part of the pcb circuit board, allocate each metal material shrapnel / dome part, and other electronic devices to set the corresponding avoidance position and precise positioning hole, etc. This product is called Dome conductive film, or metal material shrapnel film, Dome film. Sometimes, people often say that the pot chips also refer to this product. It is a piece of PET sheet containing metal shrapnel (dome), which is used as a power switch on a circuit board such as PCB or FPC, and has a key tactile power switch function between the user and the device. Compared with the traditional silicone rubber function keys, the membrane switch has a stronger tactile feeling and a longer service life, and can also indirectly improve the legal effect of the production and manufacture of various types of buttons using conductive films.