| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an infrared lighting source, which prevents the soure from taking on a red tinge observed from the outside, while utilizing infrared rays having a wavelength close to 780 nm. <P>SOLUTION: According to the infrared lighting source 5, a filter 18 and a floodlight lens 23 are arranged in receding order in front of a halogen bulb 16 which emits the light having a wavelength varying between the UV-range and the infrared range. The filter 18 absorbs the light whose wavelength is within a range between a first cut value set close to 380 nm and a second cut value set close to 780 nm, and transmits the light having a wavelength larger than that of the second cut value. <P>COPYRIGHT: (C)2004,JPO</p> |
