| 摘要 |
PURPOSE: A microwave oven having an operation button is provided to make it certain whether the operation button is pushed especially in a dark place. CONSTITUTION: An operation button(10) is coated with a coating material(20) which is produced to react with temperature. The coating material(20) is printed with characters like POP CORN, STOP, START to show operation function of the button. The coating material(20) has a display screen and temperature reaction layer. The temperature reaction layer is formed with a material which changes its color by the temperature. If a user pushes the operation button(10) to operate corresponding function, the temperature reaction layer changes its color by the heat of the user's finger, thereby certifying operation state of the operation button.
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