1. Product working principle:
The metal shrapnel on the membrane button is located on the conductive part of the PCB board (mostly located above the gold fingers on the circuit board). When pressed, the center point of the shrapnel is concave and touches the circuit on the PCB to form a loop. Pass, the whole product can work normally. The metal dome, the English metal dome, is made of stainless steel and is an important part of the switch. With the help of the conductivity of the metal dome, it can play a high-quality switch between the operator and the product. effect.
At the same time, the stable resilience of the guozi (automatically return after pressing) and the long lifespan provide the operator with high-quality tactile feedback. Shrapnel is mainly used in membrane switches of rigid boards such as printed circuit boards. We can produce non-standard thin film button conductive film (membrane switch) according to the requirements of customers. In fact, these products are made according to the drawings or requirements of customers, and there are no so-called standard parts or stocks with all specifications.
The stable performance of the shrapnel button also has a certain impact on the structure of the machine itself. The structure and performance of the pot button and the machine complement each other.
2. Product structure classification:
(1) Single layer structure
This is the simplest structure at the beginning. The metal shrapnel is located under the Mylar glue (a layer of PET with glue), and there are vent holes to ensure the basic feel and use.
(2) Double-layer structure
Different from the single-layer conductive film, it has an extra layer of Spacer (spacer), the shrapnel is better attached to the Mylar glue, and maintains good contact with the circuit board, and has a better hand feeling (somewhat similar to the film The'bulge' of the switch) In addition, the ventilation groove on the double-layer structure conductive film can more effectively prevent the PET layer from being scratched by the burrs of the shrapnel, and also prevent dust from entering the PET layer.
3. Material description:
Material: stainless steel SUS301/SUS304
Surface treatment: gold-plated, silver-plated, nickel-plated, stainless steel.
Product shape: triangle, circle, cross, oval, special shape, etc. (Can be customized with drawings and samples)
Product specifications: diameter 2.4mm-16mm, load 50g--1000g (error: +/- 10 g)
Product features: low contact resistance, oxidation resistance and wear resistance, long life, simple installation.
Environmental protection requirements: meet Rohs requirements Working life: 50W-100W/time
The resistance values of SUS301 and electroplating are: stainless steel/nickel-plated resistance <1000 milliohms, silver-plated resistance <100 milliohms, gold-plated resistance <100 milliohms
Metal bomb withstand voltage: 0.1-50VDC, withstand current: 0.005-100mADC