公开(公告)号：US20170285318A1

公开(公告)日：2017-10-05

申请号：US15455934

申请日：2017-03-10

Applicant: MITUTOYO CORPORATION

Inventor： Gyokubu CHO ,  Tatsuya NAGAHAMA ,  Takahisa OOTAKE ,  Kazuki KITAGAWA

IPC: G02B21/24 ,  G02B21/02 ,  G02B21/36

CPC classification number: G02B21/245 ,  G02B21/025 ,  G02B21/361 ,  G02B21/365

Abstract: An imaging system includes: an image forming device that obtains image information of an object with the focal length to the object being changed by a variable focal length lens in an optical system, so as to form an all-focused image of the object; a sensor device that detects variations in the surface level of the object in a focus direction; and a position adjustment device that adjusts the position of the object in the focus direction in accordance with the surface level variations of the object detected by the sensor device. The position adjustment device adjusts the position of the object in the focus direction in such a manner that the surface level of the object becomes closer to the center of a variable focal length range of the variable focal length lens.