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    • 8. 发明授权
    • Keypad assembly
    • 键盘装配
    • US08362928B2
    • 2013-01-29
    • US11686393
    • 2007-03-15
    • Joo-Hoon LeeSun-Tae JungDong-Hoon Jang
    • Joo-Hoon LeeSun-Tae JungDong-Hoon Jang
    • H03K17/94
    • H01H13/83H01H2209/074H01H2209/082H01H2219/044H01H2219/056H01H2219/06H01H2219/062H01H2221/07
    • A keypad assembly using a waveguide for guiding lights emitted from light emitting devices is disclosed. The keypad assembly includes a switch board having a plurality of dome switches. The keypad also includes a plurality of key buttons; a plurality of light emitting devices included in the switch board; a waveguide formed under the key buttons, the waveguide having a predetermined refractive index to allow lights emitted from the light emitting devices to travel according to an internal total reflection condition; a plurality of reflecting patterns formed in the waveguide to reflect the light traveling through the waveguide toward the key buttons; and an auxiliary layer formed on the surface of the waveguide, the auxiliary layer having lower refractive index than that of the waveguide to make a constant total reflection condition.
    • 公开了一种使用波导引导从发光器件发射的光的键盘组件。 键盘组件包括具有多个圆顶开关的开关板。 键盘还包括多个按键; 包括在开关板中的多个发光器件; 波导,其形成在所述键按钮下方,所述波导具有预定的折射率,以允许从所述发光器件发射的光根据内部全反射条件行进; 形成在所述波导中的多个反射图案,以将穿过所述波导的光反射到所述键按钮; 以及形成在波导表面上的辅助层,辅助层的折射率低于波导的折射率,以形成恒定的全反射条件。