STRAIGHTNESS MEASURING METHOD OF PHOTOSENSITIVE MEMBER OF ELECTROPHOTOGRAPHY

• Main Author: KUROSAWA KIMIO
• Format: Patent
• Language: English
• Published: 25.08.1989
• Subjects: CINEMATOGRAPHY; CONVEYING; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HANDLING THIN OR FILAMENTARY MATERIAL; HOLOGRAPHY; MAGNETOGRAPHY; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PACKING; PERFORMING OPERATIONS; PHOTOGRAPHY; PHYSICS; PNEUMATIC TUBE CONVEYORS; SHOP CONVEYOR SYSTEMS; STORING; TESTING; TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING ORTIPPING; TRANSPORTING

PURPOSE:To make it possible to measure the straightness of a photosensitive member without contact thereto, by arranging said photosensitive member or a base member of said photosensitive member in a manner that a shaft thereof is parallel to a surface plate, thereby to avoid a flaw from being generated on the surface of said photosensitive member or said base member. CONSTITUTION:A cylindrical photosensitive member or a base member before a photosensitive layer is formed in the photosensitive member is fixed on a surface plate 1 in a manner that the shaft thereof is parallel to the surface plate. An optical sensor comprised of a light projecting unit 71 and a light receiving unit 72 is fixed on a movable stand 5 on the surface plate 1. The light projecting unit 71 and the light receiving unit 72 are perpendicular to the shaft of the photosensitive member or the base member and parallel to the surface plate, and moreover, the units 71 and 72 confront each other with sandwiching the uppermost point of the photosensitive member 3 or the base member therebetween. When the movable stand 5 is moved in a direction parallel to the shaft of the photosensitive member shown by an arrow 6 between the straightness measuring units of the photosensitive member, the light amount entering a slit of the light receiving element 72 of the optical sensor varies in accordance with the height of the uppermost point of the photosensitive member 3, and corresponds to the swelling state on the surface of the photosensitive member 3. If, for example, the maximum changing amount in a graph showing the relation between the voltage value and the axial position of the photosensitive member 3 is converted to the changing amount of the height of the surface of the photosensitive member, the straightness can be obtained from the outputs of the optical sensor in proportion to the above light amount.