| 摘要 |
<p>PROBLEM TO BE SOLVED: To select a control means without any thermal problem even if the attitude is changed and conduct required control by providing an attitude control mechanism, plural control means, and a selection means selecting a selection means in response to the attitude of the luminaire main body. SOLUTION: The body portion 1d of the luminaire main body 1 is supported by an arm portion 1c so as to be tiltable, and is turnable by 180 deg.. When the body portion 1d is at a predetermined position, a control means 4a is on a down side so that a temperature becomes relatively low, and when the same is turned 180 deg. from the current position, then the control means 4b comes on the down side so that the temperature becomes relatively low. At an intermediate position the temperature of the down side control means becomes basically low. In this case, a selection means 5 is common for respective means 4a, 4b, a gravity sensor sensing a position by the gravity is used, and the position change of the body portion 1d, that is, the change of a luminaire attitude is sensed by the acting direction change of the gravity. Thereby, control without any thermal problem can be conducted by changing the attitude.</p> |
