Conductive Silver Ink Printing Custom Membrane Keypad For WIFI
Telecommunication Device
Key Components of Membrane Keypads
Graphic Overlays: This is the top layer that provides the visual interface. It can
be made from materials like polycarbonate or polyester, chosen
based on durability and environmental resistance.
Circuit Layer: The circuit can be printed using conductive inks or made from
etched copper. This layer is crucial for the functionality of the
keypad, allowing electrical signals to be transmitted when keys are
pressed.
Adhesives: These are used to bond the layers together and attach the keypad
to the device. The choice of adhesive depends on the surfaces
involved and the environmental conditions the keypad will face.
Embossing: This feature can enhance tactile feedback by creating raised
buttons, which can improve user experience.
Additional Features: Options like backlighting, touchscreens, and embedded components
(like LEDs or sensors) can be integrated into the design for
enhanced functionality and aesthetics.
Design Considerations
When designing a custom membrane keypad, consider the following:
Tactile vs. Non-Tactile Feedback: Decide whether you want the user to feel a click or feedback when
pressing a key. Tactile switches often use metal domes for this
purpose.Environmental Resistance: Depending on the application, the keypad may need to withstand
moisture, chemicals, or extreme temperatures. Selecting the right
materials and sealing methods is essential for durability.
Complexity of Design: Simple designs may only require a few layers, while complex
interfaces might need multiple layers and additional components
like PCBs for more advanced functionalities.
Manufacturing Options
Custom membrane keypads can be manufactured through various
methods, including:
Screen Printing: Commonly used for creating the circuit layer with conductive
inks.
Etching: Used for creating more precise and flexible circuits with copper.
Prototyping Services: Many manufacturers offer rapid prototyping services, allowing you
to test designs quickly before full-scale production.
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, UV resistance
Polycarbonate:
1.Different surface(Glossy, Matt) and thickness(From 0.12mm~2mm)
2. cost-effective in price
3.For internal and external use
2) Embossing
Rim embossing/pillow embossing/dimple embossing
Graphic overlays can be embossed in order to insert domes/LED,
leave space for mechanical keys/LED and provide tactile indications
and better tactile feeling.
3)Windows(for display function)
1. print different colors windows, As transparent grey/Red/green
window for display
2. Clear/Transparent window for LCD display
2. Matt/semi-transparent window for LED
4)Keys/buttons
Tactile keys---with metal dome or poly dome
Non-tactile--silver printing dots with flat key
5) Embeded LEDs
Small, brilliant lights only about 0.02’’ in height. Avaliable in
several vibrant colors.
LED colors: white, yellow, orange, green, red, or double colors
LED.
6)Cable
It 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, acrylic, PCB
Product index:
Operating voltage: 35V DC
Operating current: 100mA 1W
Contact resistance: < 100 Ohms
Open circuit resistance: ≥ 10MΩ at 100V
Operating temperature: Flat/Metal dome:-20°c to +80°c
Storage temperature: Flat/Metal dome:-40°cto +80°c
Life expectancy Flat type≥5,000,000 times Tactile type≥1,000,000
times
Switch stroke: 0.1 to 0.6mm
Contact bounce: 5 to 30ms
Actuation force tolerance: +/- 20 to 45g
Tactile ratio: FC > 40%
Operating humidity: up to 95% RH
Female, male connector, solder pins and heat seal connectors are
available
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