device for discrimination of bow, bilderzeugungsvorrichtung, and program with simplified mechanism

摘要

A medium discrimination device includes a transmitted light quantity measurement device (110,111) arranged to measure a transmitted light quantity in a thickness direction of a medium (114) on a conveyance route, and configured to perform a measurement of the transmitted light quantity at each time the medium is conveyed, a measurement value memory device storing a result of the measurement performed by the transmitted light quantity measurement device, a medium setting device (104,105) configured to previously set a type of medium to be used, a medium information memory device storing information of a transmitted light quantity assigned to each medium to be set by the medium setting device, and a control processing unit configured to perform paper type detection on a first medium, and double feed detection on following mediums.