Patent ID: 9712703
Date: 2017-07-18
CPC Classifications: H04N

Claim:
1. A document detecting device comprising: a plate having an upper surface on which a document is placed; a cover that has a rear surface toward the upper surface, the rear surface having a planar size; an automatic document feeder provided over the plate, the automatic document feeder having a bottom surface larger than the planar size; an imaging device that is provided at any of the rear surface of the cover and the bottom surface of the automatic document feeder and includes the upper surface in a photographing visual field range; an angle detector that detects an opening angle formed between the upper surface and the bottom surface of the automatic document feeder; and a controller that determines whether the opening angle is within an angular range in which the imaging device recognizes an entirety of the upper surface according to angular range information stored in a memory in advance, the controller detecting one or more of a position, an angle, and a size of the document on the upper surface according to an image by the imaging device and fixed-size information of the document stored in the memory in advance.