PURPOSE: To provide the microfilm on which retrieving information is imprinted in order to prevent read error caused by dust, etc., to provide the photographing device for the microfilm used in the case of performing photographing to the microfilm; furthermore, to provide the microfilm retrieving device used in the case of retrieving the microfilm. ;CONSTITUTION: As to the microfilm F; the same kinds of retrieving information(blip M, IMC, etc.) are imprinted on both A and B channels 9a and 9b. The retrieving information is imprinted by controlling first and second retrieving information imprinting mechanisms on the photographing device for the microfilm. As to the microfilm retrieving device; a CPU as a judging means judges that the blip M, etc., are detected when information read by each mark reading sensor is coincident.;COPYRIGHT: (C)1994,JPO&Japio
展开▼
