Importance

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Abstract

In a dimmer control technique of the invention, the outside light detection period is made variable and the intensity adjustment speed is changed and is made variable so as to deal with outside light change in largely different use environments, such as the inside of a room and the inside of a moving car. Cases are preset, outside light is converted into a voltage for each representative environment condition, the provided voltage is read by a microcomputer as input voltage, intensity control is performed, the relationship between the read period data and the reference voltage to be compared therewith is stored in a storage unit such as non-volatile memory, and data is fetched from the storage unit for performing control.

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First Claim