| 摘要 |
<p>A lens system 22, for a charge coupled device (CCD) camera, comprises: a first lens group 12 with a first la and a second Ib lens and having a negative focal length. The first lens la has a negative focal length and a convex surface facing an object and a concave surface facing an image. The second lens Ib has a negative focal length and is disposed further from the object than the first lens and the second lens having a concave surface facing the image. A third lens group 1112 has, in order, a first IIIa, a second IIIb and a third IIIc lens, the first lens IIIa having a negative focal length with both surfaces being concave, the second lens IIIb having a positive focal length with a convex surface facing toward the image and the third lens IIIc having a positive focal length with both surfaces being convex. A second lens group 112 has a positive focal length with both surfaces being convex, the second lens group being between the first and the third lens groups.</p> |
