METHOD FOR MEASURING CIRCULARITY OF ELECTROPHOTOGRAPHIC SENSITIVE BODY

• Main Author: KUROSAWA KIMIO
• Format: Patent
• Language: English
• Published: 05.12.1988
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHOTOGRAPHY; PHYSICS; TESTING

PURPOSE:To prevent the photosensitive surface of a cylindrical photosensitive body from flawing by standing the photosensitive body perpendicularly and supporting a rotary body on one end surface of the photosensitive body rotatably around a shaft positioned on the extension of the center shaft of the photosensitive body. CONSTITUTION:An index plate 2 is mounted on the end surface of the cylindrical electrophotographic sensitive body 1 which is stood perpendicularly. Then when a mark of the index plate 2 is put closely to the outer periphery of the end surface of the photosensi tive body 1, the center of the index plate 2 is positioned on the extension of the center shaft of the photosensitive body 1. Then when the support lever 4 of a measuring instrument is rotated around the rotary shaft 3, the output voltage of each sensor 6 is in inverse proportion to the distance from the sensor head to the photosensitive surface of the photosensitive body. Namely, the sum of their output voltages increases as the diameter of the photosensitive body on the line connecting both sensors 6 increases. For the purpose, the maximum value and minimum value of the distribution of the sum of output voltages in a half-circumference direction are found and then the circularity of the photosensitive body can be measured from the proportional relation between the value and displacement. In this case, the measure ment is taken without contacting the photosensitive surface, so the photosensitive surface is not damaged.