摘要:
A contact image sensor comprises a housing, a light source provided on the upper part of the housing to irradiate light to a document, lenses arranged in the housing and provided at least on an entering side and an outgoing side to focus reflected light from a reading position of the document, an aperture angle regulation member having an inclined surface to reflect a part of light irradiated from the light source at the reading position of the document and an aperture portion into which the reflected light enters directly to regulate an aperture angle to permit the reflected light passing through the aperture portion to be irradiated to the lens on the entering side, and a light receiving element array to receive and photoelectrically convert the reflected light focused after passing through the lenses.
摘要:
According to one embodiment, a document detecting apparatus includes a light-emitting element, a photoelectric conversion element, a light-emission controller and a detection processor. The light-emitting element projects light onto a detection position of a document. The photoelectric conversion element outputs an electric signal obtained by converting the light from the detection position of the document. The light-emission controller changes the light quantity of the light emitted by the light-emitting element. The detection processor detects the presence or absence of the document at the detection position of the document based on the presence or absence of a change of an output value corresponding to the change of the light quantity caused by the light-emission controller in an output value from the photoelectric conversion element.
摘要:
A first LED that is one of a plurality of LEDs arranged in the main scanning direction is turned on, and the presence of a document on a document table glass is determined by detection of reflected light from the document using a CCD sensor, and a second LED other than the first LED in addition to the first LED among the plurality of LEDs is turned on when it is determined that a document is placed on the document table glass, and the size of the document on the document table glass is determined based on a scanning result of the CCD sensor on the reflected light from the document caused by illumination from the first and the second LEDs and a detection result of a reflective photosensor.