Patent ID: 7651231

Claim:
A keypad device comprising a lighting module, a circuit substrate board that has an upper surface provided with a plurality of key switches, and a keypad unit that is disposed for pressing and operation by a user, said lighting module including: a transparent light guide plate stacked on said circuit substrate board and formed with a plurality of switch holes that correspond respectively in position to said key switches; at least one light emitting diode embedded in said light guide plate and connected electrically to said circuit substrate board; and a reflecting unit disposed on an upper surface of said light guide plate opposite to said circuit substrate board, and including a transparent thin plate that is stacked on said upper surface of said light guide plate, and at least one reflective layer that is formed on an upper surface of said transparent thin plate opposite to said light guide plate for covering said at least one light emitting diode; wherein said keypad unit is disposed on top of said reflecting unit, and light from said at least one light emitting diode is reflected by said reflecting unit and guided through said light guide plate to exit through said switch holes and to propagate toward said keypad unit through said transparent thin plate of said reflecting unit.