STRUCTURE FOR ILLUMINATING KEY OPERATION SECTION, ELECTRONIC DEVICE, MOBILE DEVICE AND METHOD FOR ILLUMINATING KEY OPERATION SECTION

摘要

A housing unit (34) having a window portion (36) formed correspondingly to a key switch (key domes 61 and 62) is included, a light-emitting element (12) is disposed on the back surface side of a circuit substrate (key flexible substrate 4) including the key switch (key domes 61 and 62) to reflect light (outgoing light 16) emitted from the light-emitting element (12) by a reflecting portion (21 or 22) of an illuminating plate (14) to illuminate a keypad unit (28) on the upper surface side of the circuit substrate (key flexible substrate 4) through a light-guiding window portion (81, 82, 101 or 102) of the circuit substrate (key flexible substrate 4).