Customizable Surface Mount Custom Membrane Keypad For Hairfoil Device

Customizable Surface Mount Custom Membrane Keypad For Hairfoil Device

1.Testing

• Functionality Test: Check each key for responsiveness and ensure all connections work.
• Durability Test: Test for wear and tear to ensure longevity.

2. Final Touches

• Enclosure Design: Consider an enclosure for the keypad to protect it and enhance usability.
• User Feedback: Get feedback from users to improve the design or functionality.

3. Manufacturing Process

• Printing: Use screen printing to apply the graphics and conductive traces on the membrane layers.
• Cutting: Accurately cut the overlay and spacer layers to the desired dimensions.
• Assembly: Layer the materials and apply adhesive where required.

4. Select Materials

• Overlay Material: Choose a durable and flexible material (e.g., polyester or polycarbonate) for the top layer.
• Spacer Layer: Use a non-conductive material to separate the conductive layers.
• Conductive Material: Typically, a conductive ink or silver-based material is used for the key contacts.

5. Integration

• Connection to Microcontroller: Connect the keypad to a microcontroller (e.g., Arduino) using the appropriate interface (usually a matrix or direct connection).
• Programming: Write firmware to interpret the key presses.

6.Design Layout

• Sketch the Keypad: Decide on the number of keys and their layout (e.g., 4x4 grid, numerical pad).
• Key Size and Shape: Determine the dimensions of each key based on user comfort and functionality.

 Specification:

1)Keys/buttons

Tactile keys---with metal dome or poly dome

Non-tactile--silver printing dots with flat key

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)Cable

It is an extension of the printed circuit and is used to communicate with your device.

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)Adhesive

mostly used are 3M-double-side glue

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)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

10)Backplate-

in aluminum, polycarbonate, acrylic, PCB

Common Membrane switch structure 

 
 
 
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