Composite type photosensitive member having metal-free phthalocyanine in the charge generating layer and nonionic dye base in the charge transport layer
AssigneeHitachi, Ltd.
InventorsAtsushi Kakuta, Hiroyuki Oka, Shigeo Suzuki, Kotaro Araya, Yasuki Mori, Hirosada Morishita
Life of this patent
Estimating the term…
Abstract
The disclosure is concerned with a photoconductive member useful for electrophotography wherein a charge generating layer containing a new metal-free phthalocyanine and a charge transport layer containing a nonionic compound of styrylic or oxazol dye base. The photosensitive member exhibits a high sensitivity to light having a long wavelength and therefore, it is properly used as photosensitive member for printers using semiconductor lasers.
Claims37
In a composite type photosensitive member for electrophotography in which a layer containing a charge generating substance and a layer containing a charge transport substance is disposed on a conductive substrate, the improvement wherein said charge generating substance contains at least one of a .tau., .tau.', .eta. or .tau.' form metal-free phthalocyanine pigment and said charge transport substance contains a nonionic dye base represented by the following general formula:
- ##STR4## (where X is a heterocyclic group selected from ##STR5## (where Z represents O or S and the heterocyclic group may be substituted), n is 0, 1 or 2 and each of R.sub.1 and R.sub.2 is an alkyl group of up to three carbon atoms), whereby a photosensitive member having a high sensitivity to light not only in the visible light range but also in the long wavelength range of at least 790 nm is formed.
Dependencies are inferred from the claim text.