| 摘要 |
A document detecting apparatus installed and used in an image forming apparatus that projects a scanning light is incident to a document placed on a document mount and a size and a position of the document are detected by detecting light reflected from the document, including a document pressing device which presses the document on the document mount, an opening or closing detecting device which detects opening or closing state of the document pressing device, and while the document pressing device is detected as in an opening state, document detecting operation is executed repeatedly and a detecting result is renewed, and, just before it is detected that the pressing board is closed or just before it to detected that an operation for reading an image of the document starts, the size and the position of the document are calculated on the basis of the of the detecting result in a calculation processing device.
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