Patent ID: 11936827
Assignee: SHARP KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. A control method for an image forming apparatus using a flow reading method that reads a document by irradiating the document with light from a scanning unit, at a reading position set in a conveyance path, the image forming apparatus comprising: a conveyor that conveys the document along the conveyance path; a light transmitting member that is provided below the conveyance path at the reading position; and an opposite plate that is provided opposite the light transmitting member and that allows the document that is being conveyed to pass between the opposite plate and the light transmitting member, wherein on a surface of the opposite plate that is opposite the light transmitting member, a low brightness area and a high brightness area having a higher brightness than the low brightness area are formed adjacent to each other in a conveyance direction of the document,
the control method comprising:
setting a home position of the scanning unit to a first position corresponding to the low brightness area to perform a first reading of the document passing through the reading position by an image reader;
determining whether a document image is detected based on image data obtained at a time of the first reading; and
setting the home position of the scanning unit to a second position corresponding to the high brightness area to perform a second reading of the document passing through the reading position by the image reader in a case that the document image, based on the image data, is determined as not to be detected.