| 摘要 |
A knob is provided to transmit the illumination to a button unit and to prevent non-operation of a tact switch by freely positioning the pressing unit by forming a space unit between a pressing unit and the button unit. A knob includes a button unit(130), a protrusion unit(110), and a space unit(140). The button unit(130) has a displaying unit penetrated by light. The protrusion unit(110) is formed at a rear surface of the button unit(130), and has a pressing unit(120) for pressing a tact switch. The space unit(140) is formed between the pressing unit(120) and the button unit(130).
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