| 摘要 |
The exit light from the illuminating part illuminates each key button as a spot light. Hence, leak of light to the surrounding is prevented. As a result, the visual recognition is extremely improved, and easy-to-read type data can be displayed. A telephone terminal device includes a circuit board, and a plurality of key buttons disposed at the upper side of the circuit board. The circuit board has a through-hole, and the through-hole is positioned immediately beneath at least one key button of the plurality of key buttons, and each key button is illuminated by the light passing the through-hole.
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