Laser etching is a modern technique used to backlight rubber keypads and rubber membrane switches. This process involves using a high-powered laser to remove specific layers of paint from a keypad, revealing a translucent layer underneath.
Standard Rubber Keypads
Typically, standard rubber keypads are printed with graphics or labels, which works well as long as backlighting is not needed. This method is cost-effective and simple, making it a popular choice for creating letters, numbers, and special symbols on keys. However, when backlighting is required, laser etching becomes essential.
Process of Laser Etching
Preparation: The process begins with molded rubber, which is initially translucent with a milky appearance. This rubber is then coated with opaque paint according to the design specifications.
Etching: A laser is precisely directed across the keypad surface, burning away the paint in designated areas to expose the translucent layer beneath. This creates a contrast between the translucent and opaque sections.
Result: The areas where the paint is removed allow light to pass through when backlit with LEDs, producing clear, bright, and visible symbols and graphics.
Advantages of Laser Etched Keypads
Laser etched keypads are known for their durability and ruggedness. The combination of internal light blocks and the etched nomenclature ensures unmatched backlighting quality. The result is a keypad that stands out in low-light conditions with high visibility.
Backlit Silicone Keyboards
Also referred to as luminous rubber keymats or laser-etched rubber buttons, backlit silicone keyboards utilize LED or LCD lights to illuminate the symbols. These keyboards are made from transparent silicone, which is then coated with various colored inks. Finally, the symbols are laser engraved, allowing the silicone keyboard to glow in the dark.
Key Considerations for Laser Etching Silicone Keyboards
Clean Environment: Production must take place in a clean workshop, particularly during color and PU coating. Dust can adhere to the silicone surface and mix with the ink, leading to raised dots and imperfect textures.
Controlled Etching Depth: The depth of the laser etching must be controlled precisely. Shallow engravings result in dim backlighting, while too deep engravings can cause the symbols to lose their original color.
Powder Removal: During etching, ink powder is generated on the keyboard surface. It must be promptly cleaned with an alcohol cloth to maintain a clean and bright appearance.
Protective Coating: After etching, a PU coating is applied to protect the symbols from abrasion and ensure longevity.
By following these steps, manufacturers can produce backlit silicone keyboards with clear and bright symbols, enhancing usability in low-light environments.
Laser etching is a modern technology used for backlit rubber keyboards and membrane switches. The backlight effect is achieved by removing the coating on the keyboard surface with a laser to reveal a transparent layer. Compared with ordinary printed keyboards, this method can provide clearer and brighter symbols and patterns in low-light environments. During the production process, it is necessary to keep the environment clean, control the etching depth, and remove the generated powder in time. Finally, a PU coating is sprayed to protect the symbols from wear.
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