Abstract: The present invention relates to a photosensitive member containing an a-Si:Ge layer with an a-Si intermediate layer.A photosensitive member containing a-Si:Ge has an excellent sensitivity to long wave light so that it is suitable for an electrophotographic system equipped with laser beam printer. However, the sensitivity of the member had not been improved because of their weak dark resistance and lower mobility of carrier in general.In the present invention, it is provided a photosensitive member having a-Si:Ge layer excellent in the sensitivity to long wave length by controlling the balance between the Ge content and the thickness of the a-Si:Ge layer and the concentration of oxygen or oxygen and carbon in the electroconductive layer.

Abstract: An electrophotosensitive member for use in electrophotography includes a plurality of amorphous silicon and amorphous silicon:germanium layers that are arranged in an alternating fashion. The two outermost layers are made up of amorphous silicon so that each amorphous silicon:germanium layer is sandwiched between two amorphous silicon layers.

Abstract: Though a-Si:Ge has a high absorption of long wave light, so that it can be used to improve the electrophotosensitive members in the sensitivity, and it is expected as photosensitive members for printers using semiconductor laser. However, a-Si:Ge has a tendency to prevent the movement of a carrier generated to lower a sensitivity and increase a residual potential.In the present invention, the above problems are improved by forming a depletion layer in a-Si:Ge layer to improve the mobility in forward direction of the carrier.

Abstract: The present invention provides an electrophotosensitive member comprising laminating a layer composed substantially of amorphous silicon, a layer composed substantially of amorphous silicon:germanium and a layer composed substantially of amorphous silicon in this order on an electroconductive substrate, an electrophotosensitive member comprising laminating a layer composed substantially of amorphous silicon, a layer composed substantially of amorphous silicon:germanium and a layer composed substantially of amorphous silicon in this order on an electroconductive substrate, characterized in that said layer composed substantially of amorphous silicon:germanium is situated away from said substrate by a range of 20 to 80% based on the total thickness of these layers.

Abstract: A photosensitive member which comprises a photoconductive layer and an insulating layer located on the photoconductive layer, the photoconductive layer including amorphous silicon and the insulating layer including amorphous silicon, carbon, oxygen and fluorine. The photoconductive layer has a higher resistivity than the photosensitive member. A barrier layer may be located beneath the photoconductive layer, the barrier layer including either amorphous silicon, oxygen and a Group III impurity or amorphous silicon, carbon and oxygen.

Abstract: A first timing belt transmits rotation of a crankshaft to an exhaust valve operating camshaft whose rotation is in turn transmitted through a second timing belt to an intake valve operating camshaft. A pair of adjusting pulleys are provided which is brought into contact with a tension side section and a slack side section of the second timing belt and movable in unison with each other toward and away from the timing belt sections to vary the lengths of same and thereby vary the phase of the intake valve operating camshaft relative to the exhaust valve operating camshaft in accordance with operating conditions of the engine.