公开(公告)号：US3628871A

公开(公告)日：1971-12-21

申请号：US3628871D

申请日：1969-10-06

Applicant: ANDERS B HIMMELSTRUP

Inventor： HIMMELSTRUP ANDERS B

IPC: G01J3/46 ,  G01J3/48 ,  B41F15/00

CPC classification number: G01J3/46 ,  G01J3/51

Abstract: An optical magnifying lens is mounted as part of a manually portable color printing analysis device which has support means adapted to position the lens properly above a color print surface to be inspected. A light on the device illuminates the surface, and a color filter is mounted for selective movement into the field between the lens and surface. The filter color is complementary to the color of that part of the surface to be checked. For example, a blue filter is provided for inspection of yellow printed surfaces. Preferably one or more such color filters are mounted on a filter plate movably supported on a body portion of the device, which body portion also serves as a handle and battery case. Inspection of the surface through the magnifying lens and filter provides an enlarged dark contrast image of the desired color printed areas, such as the colored dot portion of a colored halftone sheet, even though some of the colors to be inspected are partially overprinted by other colors.