Image forming apparatus

DETAILED DESCRIPTION Accordingly, an essential object of the present invention is to provide, with a view to eliminating the disadvantages inherent in conventional image forming apparatuses, an image forming apparatus in which toner density corresponding to a predetermined pattern on a photosensitive member can be detected highly accurately.
In order to accomplish this object of the present invention, an image forming apparatus comprising: a pattern forming means for forming on a photosensitive member, a plurality of patterned images having toner attached thereto; a light emitting means for irradiating light over the patterned images on said photosensitive member; and a photosensor means for detecting toner density on the basis of quantity of the light scattered by the patterned images; wherein an incident plane of said light emitting means relative to said photosensitive member is parallel to a cutting direction of a tubular stock of said photosensitive member.
By the above described arrangement of the present invention, toner density can be detected accurately in the image forming apparatus having a simple construction, so that an outputted image can be kept at an excellent density gradation at all times.