PURPOSE: To rapidly remove the dew condensation on a glass surface which blurs the eyesight and also prevent its recurrence by a simple system constitution without obstructing the visibility through the glass.
CONSTITUTION: A hot wire type heater is arranged into a glass. A defogger control device which removes dew condensation on the glass surface by energizing this hot wire type heater in duty control mode is made so that the duty- factor of energizing current supplied to it may be kept in the first preset value during the primary predetermined hours T1 after starting the energization, in the second preset value α which is less than the first one in the secondary predetermined hours T2 and, thereafter, the energization may be continued with the third preset value β which the second preset one α is reduced to.
FUJIMURA YUJI
SUDA HIROHIDE
HIRAKAWA ATSUSHI
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