公开(公告)号：US5311364A

公开(公告)日：1994-05-10

申请号：US903484

申请日：1992-06-22

申请人： Yuichiro Kanoshima ,  Taira Kouchiwa ,  Kiichiro Nishina ,  Kohji Ichimiya ,  Yoshitsugu Kohno ,  Naomi Harada

发明人： Yuichiro Kanoshima ,  Taira Kouchiwa ,  Kiichiro Nishina ,  Kohji Ichimiya ,  Yoshitsugu Kohno ,  Naomi Harada

IPC分类号： G02B9/62 ,  G02B9/52 ,  G02B9/54

CPC分类号： G02B9/62

摘要： A reading lens for a scanner to read an original in a reduced magnification, the lens comprising six lenses, i.e., from a first lens to a sixth lens in order on an optical axis. The first lens is a positive lens having a first lens-surface and a second lens-surface. The second lens is a negative lens disposed in contact with the first lens and has the second lens-surface in common with the first lens and a third lens-surface. The third lens is a meniscus lens and has a fourth lens-surface and a fifth lens-surface. The fourth lens is a meniscus lens and has a sixth lens-surface and a seventh lens-surface. The fifth lens is a negative lens and has a eighth lens-surface and a ninth lens-surface. The sixth lens is a positive lens disposed in contact with the fifth lens and has the ninth lens-surface in common with the fifth lens and a tenth lens-surface. At least one of the ten lens-surfaces is formed as an aspherical surface.

摘要翻译： 一种用于扫描仪以缩小倍率读取原稿的读取透镜，该透镜包括六个透镜，即从光轴上依次从第一透镜到第六透镜。 第一透镜是具有第一透镜表面和第二透镜表面的正透镜。 第二透镜是与第一透镜接触设置的负透镜，并且具有与第一透镜和第三透镜表面共同的第二透镜表面。 第三透镜是弯月透镜，具有第四透镜表面和第五透镜表面。 第四透镜是弯月透镜，具有第六透镜表面和第七透镜表面。 第五透镜是负透镜，具有第八透镜表面和第九透镜表面。 第六透镜是与第五透镜接触设置的正透镜，并且具有与第五透镜相同的第九透镜表面和第十透镜表面。 十个透镜表面中的至少一个形成为非球面。