| 摘要 |
<p>PROBLEM TO BE SOLVED: To facilitate the setting and change of a set value for controlling an operation mode of a light source by changing a detection set value of an external sensor according to the change in the power disconnection time of a power switch. SOLUTION: When a power switch 3 is instantaneously turned off-on with a first period (0.5 sec), the set value of the external sensor 5 is changed to a level lower than before so that the surrounding illuminance becomes dark and a power source 2 is lit. When the power switch 3 is turned off-on a bit longer with a second period (1 sec), a set level is changed to a level higher than before and the turned-on is facilitated. When the power switch 3 is turned off for a 2 sec. or more and turned on again, the set value is changed into the initial value. The set value of the external sensor can be thus set and changed without moving to the device main body. If a user forgets the set value of the external sensor, he can easily reset and do it again.</p> |
