Abstract: An electrophotographic photosensitive member, comprising: an electroconductive support and a photosensitive layer disposed on the electroconductive support, wherein the photosensitive layer comprises a triazene compound represented by the following formula (1): ##STR1## wherein R denotes hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group.

Abstract: An electrophotographic photosensitive member has an electroconductive substrate and a photosensitive layer formed thereon. The photosensitive layer contains an acetal resin having a component unit represented by the following formula (1): ##STR1## wherein X is ##STR2## R.sub.1 is a substituted or unsubstituted aryl group and a substituted or unsubstituted heterocyclic group; R.sub.2 is a hydrogen atom and a substituted or unsubstituted alkyl group; R.sub.3 is a substituted or unsubstituted alkyl group; A is a substituted or unsubstituted heterocyclic group and ##STR3## R.sub.4 is a substituted or unsubstituted heterocyclic group; R.sub.5 is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group and a substituted or unsubstituted heterocyclic group; and n and m are each 0, 1, 2 and 3.

Abstract: An electrophotographic photosensitive member has a photosensitive layer on an electroconductive support. The photosensitive layer comprises a compound having a structure represented by the general formula (1) or (2) as a charge-generating material: ##STR1## wherein A.sub.1 and A.sub.3 are respectively an alkyl radical, an aralkyl radical, an aromatic radical or a heterocyclic radical which may have a substituent; A.sub.2 is hydrogen atom, or an alkyl radical, an aralkyl radical, an aromatic radical, or a heterocyclic radical which may have a substituent; A.sub.1 and A.sub.2 may be the same with or different from each other; A.sub.1 and A.sub.2 may be linked together to form a ring; and n is an integer of 1, 2, or 3.

Abstract: An electrophotographic photosensitive member has a conductive support and a photosensitive layer provided on said conductive support. Said photosensitive layer contains an azo pigment.

Abstract: An electrophotographic photosensitive member comprises a conductive support and a photosensitive layer provided thereon, wherein said photosensitive layer contains at least one of the compounds of the following Formula (I) and (II). ##STR1## wherein Y represents an oxygen atom or a sulfur atom; R.sub.1 represents a substituted or unsubstituted aromatic hydrocarbon group or aromatic heterocyclic group which may be bonded through a bonding group; R.sub.2 and R.sub.3 each represent a hydrogen atom, a substituted or unsubstituted alkyl group or aryl group; m is an integer of 1, 2 or 3; n.sub.2 is an integer of 1, 2 or 3; R.sub.4 represents a hydrogen atom, an alkyl group or a substituted or unsubstituted phenyl group; and n.sub.2 is an integer of 1, 2 or 3.

Abstract: An electrophotographic photosensitive member comprises an electroconductive support and a photosensitive layer laid on the electroconductive support, the photosensitive layer containing a compound represented by the following general formula (1): ##STR1## wherein R in a substituted or unsubstituted aromatic group or heterocyclic group; X is substituted or unsubstituted benzenediyl, 2,3-pyridinediyl, 3,4-pyridinediyl or 2,3-pyrazinediyl; Y is an oxygen atom, a sulfur atom or a dicyanomethylene group, Z is an oxygen atom, a sulfur atom, a dicyanomethylene group or ##STR2## m is an integer of 1 2 or 3; and n is an integer of 0 or 1.

Abstract: An electrophotographic photosensitive member having a photosensitive layer on an electroconductive support, comprises an azo pigment represented by the general formula (1) as a charge-generating substance in the photosensitive layer ##STR1## wherein A.sub.1 and A.sub.2 are respectively an aromatic radical or an heterocyclic radical which may be linked through a linking radical; B is a radical necessary for forming together with the carbon atoms a five-membered, six-membered, or seven-membered ring which may be condensed with an aromatic ring; X is a radical condensing with the aromatic ring to form a polycyclic aromatic or heterocyclic ring; Y is oxygen, sulfur, dicyanomethylene, or cyanomethylene.

Abstract: An electrophotographic photosensitive member has a photosensitive layer on an electroconductive support. The photosensitive layer comprises a compound represented by the general formula (1) or (2) having in the molecule thereof an electron-donating portion and an electron-accepting portion: ##STR1## where D is an electron-donating aromatic group or an electron-donating heterocyclic group; A is an electron-accepting aromatic group or an electron-accepting heterocyclic group; B is a hydrogen atom, or an aromatic or heterocyclic group which may form a ring together with A or D; m is an integer of 1, 2 or 3; and n is an integer of 0 or 1.

Abstract: A laminated layer type electrophotographic photosensitive member has a charge generation layer and a charge transport layer on an electroconductive support, characterized in that the charge generation layer has at least one of disazo pigments represented by the formulae (1) and (2).