| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fold-up type lighting fixture which certainly keeps illuminance on an illuminating surface nearly constant. Ž<P>SOLUTION: The fold-up type lighting fixture is provided with a light emitter 2 having a light-emitting face 2a and building in an LED panel, a body 4 having a mounting surface 4a, a 3-axis acceleration sensor to detect the tilted angle of the light-emitting face 2a, and a control part to control luminous intensity. The control part controls the luminous intensity of an LED panel so that it may become smaller as the object angle between the mounting surface 4a and the light-emitting face 2a becomes smaller than a right angle. For example, as shown in the Fig.3(5), when the light-emitting face 2a and the mounting surface 4a are perpendicular, the luminous intensity of the LED panel is maximum, and as shown in the Fig.3(6), when the object angle becomes 45 degrees, the luminous intensity of the LED panel is dropped to one-half. By these controls, when the illuminating surface is on the nearly same surface as the mounting surface and in front of the lighting fixture, the luminous intensity on the illuminating surface can be certainly kept constant irrespective of the distance from the light-emitting face to the illuminating surface. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
