ZhiJian Hardware

Metal shrapnel, metal shrapnel is a main component of the power switch, also known as dome or metal dome, snap dome, choose thin (0.05mm-0.1mm thickness) and extra thick (generally higher strength) ) made of stainless steel 301 or 304 raw materials. Metal shrapnel is mainly used in membrane switches, touch power switches, PCB boards, FPC boards, medical equipment and other commodities.

The principle of metal shrapnel: the metal shrapnel on the membrane switch is located on the conductive part of the PCB (most of them are located on the fiery red gold finger on the pcb circuit board), when pressed lightly, the positioning point of the shrapnel is concave and touches the PCB On the route, and then generate a loop, according to the current flow, all the goods will be in normal operation.

Generally, the basic metal shrapnel is divided into: annular metal shrapnel, cross-shaped metal shrapnel, triangular metal shrapnel, and oval metal shrapnel according to their different appearances. Diameters range from 3mm to 20mm and ranges from 100g to 600gf. Of course, if you have unique regulations to do according to your engineering drawings, there is no problem.

According to the customer's regulations on the resistance value, our metal shrapnel also has various surface treatments such as nickel plating, gold plating, and gold plating.

The metal shrapnel on the membrane button is located on the conductive part of the PCB board (mostly above the gold fingers on the circuit board). When pressed, the center point of the shrapnel is concave and contacts the circuit on the PCB, thus forming a loop, the current Through, the whole product can work properly. General conventional metal shrapnel, according to their different shapes are divided into: round metal shrapnel, cross-shaped metal shrapnel, triangular metal shrapnel, oval metal shrapnel.

Metal shrapnel conductive film is also called dome conductive film. It is a piece of PET glued sheet containing metal shrapnel (dome), and each metal shrapnel/pot is arranged according to the corresponding PAD (pad) position on the circuit board. The position of the chip, and other components to set the corresponding space avoidance and positioning holes.

The working principle of the metal shrapnel conductive film is that the metal shrapnel is located on the conductive part of the PCB/FPC board (mostly located above the gold fingers on the circuit board). When pressed, the center point of the shrapnel is concave and contacts the PCB. The circuit is formed to form a loop, the current passes through, and the whole product can work normally.

Metal shrapnel conductive film/dome conductive film is used as a switch on circuit boards such as PCB or FPC, and plays an important role as a tactile switch between the user and the instrument. Compared with the traditional silicone keys, the conductive film has a better feel and longer life, and can also indirectly improve the production efficiency of various types of switches using the conductive film.