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NEW FIBER OPTIC BACKLIGHTING PANELS FEATURE MEMBRANE

EDN China?? 2003年08月27日 ?? 收藏0

SWITCH CONDUCTIVE PADS INTEGRATED INTO THE BACKLIGHT

Strongsville, OH, August 2003 - New FIBER optic backlighting PANELS from Lumitex, Inc. for MEMBRANE switch backlighting applications feature conductive pads designed into the panel that integrate switch technology into the fiber optic backlight for use in keypads, keyboards and membrane switches.

NEW FIBER OPTIC BACKLIGHTING PANELS FEATURE MEMBRANE

Utilizing as few as one 3mm or 5mm LED light sources, these backlights permit low power consumption (10-25 mA), have long life (up to 100,000 hour

s), have zero impact on the tactile feel of elastomeric keys, and can backlight a larger area than surface mount LEDs.

The conductive pads are printed onto the underside (back reflector) of the fiber optic panel and, when integrated with rubber keypads or membrane switch overlays, function as a switch.? The pads are composed of a conductive material suspended above the traces on the printed circuit board.? When a button on a rubber keypad or membrane switch is depressed, it deflects the conductive pad down on to the PC board where it makes contact, closing the circuit.

"In previous designs, the conductive layer has been sandwiched between the backlight, which provides the illumination, and the device to be backlit," said Walter Schulz, Applications Engineer at Lumitex.? "This design is inefficient in that the light transfer from the backlight to the overlay is blocked by the conductive pad.? The Lumitex design provides a direct path for the light with no interference."

Lumitex's unique approach -- the conductive pads integrated with the fiber optic panel -- permits switches to be totally encapsulated, with an adhesive layer around the PC board traces to seal out contaminants that can cause switches to fail prematurely.

Lumitex fiber optic backlighting panels utilizing the Membrane Switch Conductive Pads are also available with the company's new compact LED connector that measures only 3mm in diameter.? They are ideal for applications such as remote control


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