| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lens for illumination to change an irradiation range as well as suppressing unevenness of brightness of light by two lenses, and provide an illumination device to change the irradiation range as well as suppressing unevenness of the brightness of the light by the two lenses in the illumination device to irradiate ahead the light emitted from a light source. <P>SOLUTION: This is constituted of the two lenses which are a lens 45 having a positive refractive power and a lens 48 having a negative refractive power for magnification zoom sequentially from the light source side, the lens 45 of a biconcave plastic lens in which a face of the light source side serves as aspheric surface profile, and the lens 48 is a both-concave plastic lens. Furthermore, in the illumination device, a light emitting diode is made to be the light source ahead of the light source in the order from the light source, the both-convex plastic lens 45 in which a face for the incident light has an aspheric surface profile and which has the positive refractive power for magnification zoom, and the both-concave plastic lens 48 which has the negative refractive power for magnification zoom are provided, and one lens of the two lenses is mounted movably in the direction of the optical axis. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
