Document Type and Number:
Japanese Patent JPS4986084
Kind Code:
A
Abstract:
A detector of blemishes in opposite faces of a substantially planar object or web comprises a scanning station past which the object moves, the scanning station including a laser, a lens system to focus the beam onto the surface and a detector to receive light diffusely reflected from the surface and to produce a blemish signal when a change is detected in the amount of light reflected. The scanning station is arranged with respect to the object so that the beam scans in a direction normal to the plane of the object and mirrors are provided, inclined to each face of the object such that the scanning beam strikes each mirror in turn and is reflected therefrom to scan both faces of the object.
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Application Number:
JP8419473A
Publication Date:
August 17, 1974
Filing Date:
July 27, 1973
Export Citation:
International Classes:
G02B26/10; G01B11/30; G01N21/89; G01N21/892; (IPC1-7): G01N21/06