Structure of Membrane Switch
Membrane Switch Layers Brief Description :
1. Graphic Overlay :
It uses as the front of a membrane switch or front panel class="Membranepage" display, providing a human-machine interface. Graphic Overlays are designed to communicate with the product by the user. It is used to provide an interface between man and machine that clearly communicates function, key/window positions, key titles, corporate logo, and more relevant information, on the front of a membrane switch or front panel display.
2. Graphic Overlay Adhesive :
The main purpose of the Graphic Overlay Adhesive is to keep the Graphic Overlay and the Top Circuit Layer together. We must choose materials with various properties based on the needs of our customers.
3. Top Circuit Layer :
It is between the graphic overlay adhesive layer and the spacer layer.Silver ink or carbon-based inks and dielectric ink will be screen printed onto polyester to the top circuit layer.
4. Spacer Layer :
The upper and bottom circuit layers are separated by a spacer.The spacer layer serves as a venting layer for keys, as well as a housing for metal domes and LEDs. Its thickness determines the switch's tactile response.
5. Metal Domes :
The metal dome, as we are all aware, can provide tactile feedback. When pushing membrane switches, the Top circuit's contacts are deformed downward and come into contact with the bottom circuit's surfaces.
6. Bottom Circuit Layer :
Silver ink or carbon-based inks and dielectric ink will be screen printed onto polyester to bottom circuit layer. When it connects with the upper circuit layer or the dome switch owing to outside pressure, it forms a closed loop. The required switching effect is actuated by this closed-loop.
7. Rear Adhesive Layer :
This adhesive layer attaches the complete membrane switch package to the product enclosure, housing, or rigid support panel. StarTrek can recommend the best adhesive kind and thickness for bonding your membrane keypad to your equipment.
