公开(公告)号：US5254845A

公开(公告)日：1993-10-19

申请号：US931944

申请日：1992-08-18

申请人： David C. Burgess ,  Clive A. Stubbings ,  Jacques Ginestet ,  Ilya Ravkin

发明人： David C. Burgess ,  Clive A. Stubbings ,  Jacques Ginestet ,  Ilya Ravkin

IPC分类号： G02B7/38 ,  G01J1/20

CPC分类号： G02B7/38

摘要： In an automatic focusing system an element (2) is inserted in the path of a beam of light (3) directed towards a sensor array. The element comprises a transparent material or predetermined reflective index, the element presenting a first region (4) of a first thickness and another region (5) of a greater thickness. The image falling on to the sensor comprises three areas--one area where the light has passed through the one region and another area where the light has passed through the further region and yet another area. The automatic focusing system derives signals from two of the areas and processes the signals so that the image is in focus in the third area.

摘要翻译： 在自动对焦系统中，元件（2）插入到指向传感器阵列的光束（3）的路径中。 该元件包括透明材料或预定的反射指数，该元件具有第一厚度的第一区域（4）和更大厚度的另一区域（5）。 落在传感器上的图像包括三个区域 - 一个区域，其中光已经通过一个区域，另一个区域，其中光已经通过另一区域，另一个区域。 自动对焦系统从两个区域中得到信号，并对信号进行处理，使得图像在第三区域中聚焦。