| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an infrared zoom lens including at least one lens made of chalcogenide tractable in processing such as press-molding, grinding and the like, to facilitate compensating for spherical aberration that is generally hard to do, thereby producing a clear and vivid image. <P>SOLUTION: The infrared zoom lens has first to fourth lens elements arranged in order from an object side; each of the first to the fourth lens elements being of a single lens piece, and at least one of the first to fourth lens elements is made of chalcogenide. <P>COPYRIGHT: (C)2011,JPO&INPIT |
