| 摘要 |
PURPOSE:To make it difficult to receive the effect of external light or the color of an object and to easily adjust a light quantity for the object by driving an infrared LED with a driving signal which is outputted only during a variable driving time. CONSTITUTION:In an illuminating device provided with an infrared LED 18 which is driven to emit light by a light emission inhibition circuit 38 and a light emission driving circuit 44, the infrared LED 18 emits the illuminating light only for a light emitting time T since an inhibiting time (t) elapses after a timing pulse by the action of the circuits 38 and 44. The object 62 which is moving at high speed is illuminated only for the light emitting time T and the still picture of the moving body is obtained through an image pickup device such as a CCD camera 20, etc. By arranging a light transmissive scattering plate 14 ahead of the infrared LED 18, the infrared light emitted from the infrared LED 18 is scattered when it is transmitted through the scattering plate 14. Therefore, the scattering plate 14 becomes a surface light source to equally illuminate the object. |
