| 摘要 |
PURPOSE: A stone bed for blocking electromagnetic wave and generating very-low-frequency wave is provided to improve thinking power and concentration by delivering negative ion and far infrared ray to the human body. CONSTITUTION: A stone bed for blocking electromagnetic wave and generating very-low-frequency wave comprises an upper plate(110), an electromagnetic wave absorbing and filtering device, a temperature controller, and a controller. The upper plate is dried at 60-70 deg.C for 1-2 days after ultra violet coating on the upper side thereof. The electromagnetic wave absorbing and filtering device is electrically connected to a kappa plate. The temperature controller controls the heating temperature of a carbon heater. The controller controls the temperature of the carbon heater according to the set value of the temperature controller.
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