OEM Customized Design Diy Membrane Switch With Glossy Surface
Materials Needed
- Conductive Material: Aluminum foil or conductive tape.
- Insulating Material: Cardstock or a similar non-conductive material to create spacers.
- Adhesive: Glue or double-sided tape.
- Design Software: Optional, for creating the layout of your keypad.
- Laminator: Optional, for added durability.
Steps to Create a Membrane Switch
Design Your Keypad:
- Decide on the layout and number of buttons. A common approach is to use a matrix layout (e.g., 3x3) which reduces the number of wires needed [1].
Create the Layers:
- You will need four layers:
- Front Decal: This is the top layer that users will see and press.
- Top Foil Layer: This layer contains the conductive paths for the rows.
- Bottom Foil Layer: This layer contains the conductive paths for the columns.
- Cutout Layer: This layer separates the top and bottom foil layers until a button is pressed [3].
Assemble the Layers:
- Print your designs for the front decal and the foil layers. Use copper tape for the conductive paths on the top and bottom layers.
- Cut holes in the cutout layer where you want the buttons to be. This allows the top and bottom layers to connect when pressed [3].
Connect the Layers:
- Glue the layers together, ensuring that the cutout layer is positioned correctly to allow contact between the top and bottom foil layers when a button is pressed [3].
Final Touches:
- Optionally, laminate the front decal for protection against wear and tear. This can help prolong the life of your membrane switch [1].
Considerations
- Durability: Using a laminator can enhance the durability of your keypad, especially if it will be used frequently [1].
- Tactile Feedback: If you want tactile feedback, consider incorporating metal dome switches beneath the top layer [3].
- Testing: Once assembled, connect your membrane switch to a microcontroller (like an Arduino) to test its functionality [3].
Membrane Switch Specification:
1)Material---for front or face overlay
Polyester
1.Highly versatile for embossing 2.Highly resistant to chemicals
3.Better durability 4.For internal and external use
Polycarbonate
1.Wide range of surface finishes and thicknesses
2.More cost-effective 3.For internal and external use
2) Embossing--rim embossing pillow embossing dim embpssing
Graphic overlays can be embossed in order to insert domes (tactile), leave space for mechanical keys and provide tactile indications Pedestal embossing
3)Windows ----for display function
1. print colors windows
2.transparent finishes windows
4)Keys/buttons
Tactile keys---with metal dome or poly dome
Non-tactile--silver printing spot
5) Embeded LEDs-
miniature LED, LED colors:white, yellow, orange, green, red, etc.
6)Cable
is an extension of the printed circuit and is used to communicate with your device
7)Types of connector
1.Zero insertion force (ZIF) connector; 2.Female connector; 3.male connector
8) EMI / RFI / ESD Shielding
use an aluminum foil shielding / a clear ITO electrical conductive polyester
9) Adhesive ----mostly used are 3M-double-side glue
10)Backplate---in aluminum, polycarbonate or acrylic
Membrane switch Performance Index:
| Environmentl | Operating Temperature | -40°C to +80°C (-40°to 176°F) | | | Storage Temperature | -40°C to +85°C (-40°to 185°F) | | | Humidity | 40°C, 90% to 95% for 240 hours | | | Vibration | 20G's max. | | Mechanical | Actuation Force | Non-tactile 60g to 300g (2oz to 10oz) | | | | Tactile 150g to 400g (6oz to 14oz) | | | Switch Stroke | Non-tactile 0.1 to 0.5mm | | | Life Expectancy | Tactile 0.6 to 1.5mm | | | | Non-tactile >5 million actuations | | | | Tactile >1 million actuations | | Electrical | Operating Voltage | 35 volts maximum | | | Operating Current | 10 micro amps to 100 milliamps, resistive | | | Operating Power | 1 watt maximum | | | Circuit Resistance | 10 ohms to 500 ohms, dependent on size and layout | | | Insulation Resistance | 100M ohms at 100V DC | | | Dielectric Withstand | >250 VRMs (50-60Hz 1 minute) | | | Contact Bounce | ≤ 5 milliseconds |
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