| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a vehicular lighting device having an improved observation property enabled to observe the same observation range as that observed by visual light and visual observation by expanding the width of irradiation when irradiating infrared rays. <P>SOLUTION: An infrared-ray filter 5 having an infrared-ray transmitting property is detachment freely mounted on a light source 2 of the vehicular lighting device 1 which is used as a visible light lighting device when the infrared-ray filter is dismounted, and used as an infrared-ray projection device when the infrared-ray filter is mounted. The visual field when the infrared-ray filter is mounted is made to coincide with that when the filter is dismounted, by applying such a treatment to the infrared-ray filter that makes a light diffusion width in a horizontal direction wider than that when the filter is dismounted. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
