| 摘要 |
PROBLEM TO BE SOLVED: To provide a keyboard unit capable of adjusting deterioration of key brightness and deviation of chromaticity.SOLUTION: A keyboard unit 1 comprises a key switch section 2 and a backlight unit BL. The key switch section comprises a key top, a base plate provided below the key top, a pantograph section 7 arranged between the key top and the base plate, and an energization mechanism energizing the key top upward. The backlight unit BL comprises a light guide plate 21, a light source L arranged on an end face of the light guide plate, and a reflection sheet 22 arranged below the light guide plate. The reflection sheet has a silver glossy surface as a reflection plane and has such a characteristic that the reflected light includes a larger amount of a yellow component than that of the light before reflected. The light source is an LED light source for emitting light approximate to white, having chromaticity deviated to a blue side from a reference white color. |
