Shindengen Electric Manufacturing Company Limited

Yamanashi Electronics Co., Ltd.

Kazuhito Dohi

Hajime Suzuki

Kenichi Fujimori

Masahiro Horigome

Fuminori Tsuruta

Tadaichi Murata

Tsuneo Isomura

Yoichi Watanabe

Sachio Oomori

Yoshitarou Nakayama

Tetsushi Shiozawa

An electrophotographic photoreceptor which is excellent in various properties, has effectively inhibited photo-induced fatigue and has stability against repeated use, and which comprises an electroconductive support and a photosensitive layer comprising as essential components a charge-generating material and a diaminodiphenyl compound represented by the general formula (I): ##STR1##

Electrophotographic photoreceptor

The invention provides an electrophotographic photoreceptor excellent in various characteristics, especially effectively protected from light fatigue and stable against repeated use. The photoreceptor comprises an electroconductive substrate having placed thereon a photosensitive layer which contains a bisazo compound of the formula [I]: ##STR1## a diamine derivative of the formula [IV]: ##STR2## and a specific amount of a phenolic antioxidant, and the photoreceptor contains, if necessary, an intermediate layer between the electroconductive substrate and the photosensitive layer.

Electrophotograhic photoreceptor

An electrophotographic photoreceptor having a photosensitive layer containing a butadiene compound represented by general formula ##STR1## wherein A.sub.1 to A.sub.4 are alkyl group, and a hydrazone compound represented by general formula ##STR2## wherein B.sub.1 and B.sub.2 are alkyl, phenyl, benzyl or methoxyphenyl groups, R.sub.1 is hydrogen, alkyl, alkoxy or benzyloxy groups and R.sub.2 is alkyl, phenyl or benzyl groups. The photoreceptor can suppress the photo-deterioration due to cyclic operation and is useful in the field of copying printers.

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Kofu, Japan

Kazuhito Dohi