Abstract
A reliable 15-μm-thick high-gain avalanche rushing amorphous photoconductor (HARP) film with an avalanche multiplication factor of about 200 has been developed. High-sensitivity HARP photoconductive film, which makes use of the avalanche multiplication phenomenon, has been investigated for the purpose of reporting breaking news at night or producing nature and science programs. HARP films that are thicker and more sensitive than previous 8-μm-thick ones have been studied. However, thickening the HARP film caused defects to appear during shooting intense spotlights. Controlling the operating temperature of the 15-μm-thick HARP film over 30°C was found to prevent the occurrence of defects. Moreover, heat resistance of the film was improved to resist temperatures of over 30°C.
