Abstract: A novel compound for a capping layer, and an organic light-emitting device containing the same are disclosed.

Abstract: An optical guide and an image forming apparatus which uses the optical guide in an eraser or an auxiliary transfer device. The optical guide guides light incident through one side in a lengthwise direction, makes the light in an effective width range of the lengthwise direction uniform and outputs the light. The optical guide includes a first surface on which a plurality of reflective slopes each having a stripe shape and forming a predetermined angle with respect to the lengthwise direction are discretely formed. Either an angle formed between the slopes and the lengthwise direction or an interval between the reflective slopes is varied. The optical guide further includes a second surface which is opposite to the first surface and is used as an output surface from which light reflected from the reflective slopes is output.

Abstract: An optical guide and an image forming apparatus which uses the optical guide in an eraser or an auxiliary transfer device. The optical guide guides light incident through one side in a lengthwise direction, makes the light in an effective width range of the lengthwise direction uniform and outputs the light. The optical guide includes a first surface on which a plurality of reflective slopes each having a stripe shape and forming a predetermined angle with respect to the lengthwise direction are discretely formed. Either an angle formed between the slopes and the lengthwise direction or an interval between the reflective slopes is varied. The optical guide further includes a second surface which is opposite to the first surface and is used as an output surface from which light reflected from the reflective slopes is output.