| 摘要 |
A toner supply container (24) which is detachably mountable to an image forming apparatus includes an optical device (110) and a supporting member (108) for rotatably supporting the optical device. The optical device comprises a light emitting element (110a) and a light receiving element (110b) for detecting a remaining toner amount in the toner supply container. The toner supply container comprises a rotatable container body having a toner containable inner space, an optical window (109) which permits passing a light from the light emitting element toward the light receiving element, and an engaging portion engageable with the supporting member to permit rotation of the optical window while substantially maintaining a positional relation relative to the optical device. |
