| CPC G02B 6/0031 (2013.01) [G02B 6/002 (2013.01); G06F 3/0202 (2013.01)] | 21 Claims |

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1. A backlight module configured to illuminate at least one key cap, the backlight module comprising:
a light emitting unit;
a light guide plate having a light guide hole for accommodating the light emitting unit; and
a lighting board having at least one pair of pads connected to the light emitting unit respectively, the lighting board comprising a first reflective layer surrounding the light emitting unit and at least partially covering the at least one pair of pads;
wherein each of the at least one pair of pads has a plurality of branches and at least one hollow area, the at least one hollow area overlaps with at least one part of the light emitting unit, and at least one lighting area is located between the at least one pair of pads.
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