Yoichi Nishioka

Near‐infrared sensitive electrophotographic photoconductors using chloroindium chlorophthalocyanine

Layered electrophotographic photoconductors using chloroindium chlorophthalocyanine have been investigated. An evaporated film of chloroindium chlorophthalocyanine has a broad and strong light absorption band in the visible to near‐infrared region and its crystal structure is very stable. The photoconductor using chloroindium chlorophthalocyanine as a carrier generation layer and polyvinylcarbazole as a carrier transport layer is highly sensitive in a wide spectral region (500–900 nm) without any special treatment during its preparation. The typical value of sensitivity is 2.5 cm2/μJ at 800–900 nm, so that this photoconductor is most suitable for a laser printer equipped with a AlGaAs laser diode.

THERMO-REVERSIBLE RECORDING MEDIA

We have developed a medium using the thermosensitive recording layer, which consists of polyvinyl acetal and higher fatty acid. It has distinctive thermo-reversible characteristics, and is able to take two states, a transparent state and an opaque state, reversibly at room temperature through the difference in cooling rates after heating. Thermo-reversible mechanism of the media is responsible for miscibility and immiscibility for this blend system. After 100 cycles of printing by a thermal head and erasing by a heat roller, no deterioration of either transparent states or opaque states is observed.