Patent ID: 7391981

Claim:
A developer supply container detachably mountable to a main assembly of an image forming apparatus, the image forming apparatus including a remaining amount detecting device for detecting an amount of remaining developer by receiving light from a light emitting portion by a light receiving portion, said developer supply container comprising: a container body for containing a developer; and a light guiding member including an incident portion for receiving light from the light emitting portion and for guiding the light into said container body, an emergent portion for guiding the light having passed through said container body toward the light receiving portion, and a connecting portion connecting said incident portion and said emergent portion, wherein said light guiding member is mounted to said container body so that said connecting portion covers a part of an exterior wall surface of said container body, wherein said connecting portion is provided with a through hole for exposing the exterior wall surface of said container body at a portion which reflects the light emergent from the light emitting portion toward the light receiving portion without passing through said incident portion, and wherein said container body is constituted by a member having a light reflectance which is lower than that of said connecting portion so that the exterior wall surface of said container body exposed at the through hole has a light reflectance that is smaller than that of said connecting portion.