MARK READING METHOD OF MICROFILM DRIVING DEVICE

• Main Authors: ICHIZUKA AKIRA, YAMATO YOUICHI
• Format: Patent
• Language: English
• Published: 28.06.1985
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; PHOTOGRAPHY; PHYSICS

PURPOSE:To read a mark accurately by changing a set reference value in accordance with the illuminance of a light source and variance of the density of a film base. CONSTITUTION:Before a microfilm 1 is loaded, the light of the light source is received directly by a photo sensor 9, and light source i...