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US 5,634,173 AGranted
Image forming apparatus capable of controlling amount of light of light source
AssigneeSharp Kabushiki Kaisha
InventorNaoyuki Kamei
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Abstract
In an adjustment mode, a black reference member is positioned opposite to a photosensor. Light reception data output from an A/D converter at this time is stored in a memory. In an image formation mode, based on a value obtained by subtracting output data stored in the memory from output data of the A/D converter in a state where the photosensor is opposite to an original, a copy lamp is driven. As a result, an image mode can be controlled based on an accurate detection result of an image density.
Claims4
An image forming apparatus, comprising:
- a light source exposing an original;
- image forming means for forming an image based on light from said light source reflected from said original;
- first light amount detecting means for detecting the amount of first light reflected from said original;
- second light amount detecting means for detecting the amount of second light reflected from a black reference original having a reference density;
- means, for correcting an output from said first light amount detecting means with an output from said second light amount detecting means, including a memory storing a relationship between correction data of said correcting means and driving voltage of said light source;
- and
- means for controlling the amount of light of said light source with an output of said correcting means.
4 more elements
Dependencies are inferred from the claim text.