Abstract: The mechanical characteristics of the support substrate and the insulation layer of an organic field effect transistor are optimized to thereby attain a high mobility, a high on-current and a low leak current, and a high on/off ratio in the organic field effect transistor. A field effect transistor comprising, as provided on a support substrate 1, an insulation layer 3, a gate electrode 2 and an organic semiconductor layer 4 separated by the insulation layer, a source electrode 5 and a drain electrode 6 provided so as to contact the organic semiconductor layer 4, wherein elongation ?1 (%) at the yield point of the insulation layer is larger than elongation ?2 (%) at the yield point of the support substrate. It has good flexible characteristics, whereby cracking, etc. due to a stress exerted will be suppressed, and a leak current will thereby be reduced, and thus, a high mobility, a high on-current and a low leak current, and a high on/off ratio can be attained.

Abstract: An organic semiconductor material comprising a compound which has a generalized porphyrin skeleton and which has a molecular structure such that the distance from the generalized porphyrin ring plane to the center of each atom forming the generalized porphyrin skeleton, is not more than 1 Å

Abstract: An image processing apparatus comprising: a spatial filtering section storing coefficients arranged in i rows and j columns, for receiving pixel data items representing the input image and arranged in i rows and j columns, and for multiplying each pixel data item by a corresponding coefficient; a coefficient memory having groups of coefficient registers for storing the coefficients set in the spatial filtering section; a selection data generating section for generating coefficient-selecting data representing coefficients to be read from the coefficient registers of each group and for changing the coefficient-selecting data in accordance with the pixel data items which is to be input to the spatial filtering section; and a coefficient selecting section for receiving the coefficient-selecting data generated by the selecting data generating section, reading coefficients from the coefficient registers of each group in accordance with the coefficient-selecting data, and setting the coefficients in the spatial filt

Abstract: Disclosed herein is a photoreceptor for electrophotography comprising a conductive substrate and a photosensitive layer thereon containing an azo compound represented by the formula (I):A-N=N-D-N=N-B (I)wherein A represents a coupling component derived from the following formula (II): ##STR1## wherein Q represents a divalent group derived from an aromatic hydrocarbon which may have one or more substituents or a divalent group derived from a heterocyclic compound which may have one or more substituents, B represents a different coupling component having a phenolic hydroxyl group from said A, and D represents a divalent group in which the carbon atoms bonded to the azo groups are SP.sup.2 carbon atoms forming double bonds.

Abstract: An azo compound with the following general formula (I): ##STR1## wherein X is selected from the group consisting of hydrogen atom, lower alkyl group, lower alkoxy group, halogen atom and cyano group;Y is phenylene or naphthylene group;Z.sub.1 and Z.sub.2 are independently the divalent group represented by the following formula: ##STR2## wherein A is a divalent group derived from the aromatic hydrocarbon or heterocyclic compound including one or more nitrogen atoms in the ring; andn is 1 or 2,is disclosed. Such compounds are useful in forming a photosensitive layer of an electrophotographic photoreceptor.

Abstract: A photosensitive member for electrophotography comprising at least a photoconductive layer on a conductive substrate, the photoconductive layer containing polyvinyl acetal having a constituent unit represented by the following general formula [I]: ##STR1## wherein Ar represents an aryl group, R.sub.1 a hydrogen atom, a lower alkyl group or an arly group, and m an integer of 0 or 1-3, and a constituent unit represented by the following general formula [II]: ##STR2## wherein R.sub.2 represents a hydrogen atom or an acyl group, the constituent unit of the general formula [I] being 40 mole % or more, and the total of the constituent units of the general formulae [I] and [II] being 60 mole % or more. This photosensitive layer has high sensitivity and durability and low residual potential.

Abstract: An electrophotographic photoreceptor according to this invention has a photosensitive layer in which a photoconductive substance with the following general formula (I): ##STR1## wherein X is selected from the group consisting of hydrogen atom, lower alkyl group, lower alkoxy group, halogen atom and cyano group;Y is phenylene or naphthylene group;Z.sub.1 and Z.sub.2 are independently the divalent group represented by the following formula: ##STR2## wherein A is a divalent group derived from the aromatic hydrocarbon or heterocyclic compound including one or more nitrogen atoms in the ring; andn is 1 or 2, is incorporated.

Abstract: An electrophotographic plate comprising a photosensitive layer containing a hydrazone compound represented by the general formula: ##STR1## (where X, Y and Z represent independently hydrogen atom, a lower alkyl group, a lower alkoxy group, phenoxy group or an arylalkoxy group; R represents hydrogen atom, a lower alkyl group, allyl group, an aralkyl group or an optionally substituted phenyl group; m and l represent independently 1 or 2; and n represents 0 or 1).