| 摘要 |
<p>A projection apparatus and method are described. A projector includes a freely displaceable casing 14, in which a laser light source 24 and a modulation and projection arrangement are included. Light 26 from the light source 24 is modulated according to image data and projected into a projection region outside of the casing 14 to form an image 22 on a screen 12. A security unit has an inertial sensor 40, 44, 46 for detecting acceleration and/or movement of the casing 14. A movement value (?, A) corresponding to a movement of the casing 14 leading to a displacement of the projection region is determined. The movement value (?, A) is compared to a movement threshold (?<SUB>T1</SUB>, A<SUB>T1</SUB>), (?<SUB>T2</SUB>, A<SUB>T2</SUB>). If the movement value is above the threshold, the intensity of the projected light 20, 20a is reduced, or the projected light is turned off.</p> |
