Characteristics and Sensitization of Free Radical Sensitive Materials on Electron Beam Recording

Abstract

In relation to the electron beam recording (EBR) of television films, the free radical sensitive materials, which consist of polyhalogen compounds and arylamines, were studied.
The experimental results indicate the sensitivity of 10^-7c/cm² on electrons. But this is still insufficient for EBR.
The optical development process, whereby red-light uniformly irradiates on the sensitive film after the image exposure, was applied to the composition of leuco malachite green (LMG)/carbon tetrabromide (CTB) system. Consequently, the sensitivity of 10^-10c/cm² was obtained, which was nearly 1, 000 times as high.
Based on this result, a 16 mm film was test-produced and electron beam TV recording was done on it, and it was found that the film was capable of being recorded at TV-rate. This, in fact, was done for the first time with non-silver salts.
However, this LMG/CTB system does not match well with the blue light of flying spot scanning reproduction because of its being of green color. And also, in the optical development, since the sensitive materials showing other colors must be irradiated with light of shorter wavelength than red, the fog is caused in the non-image areas. This is the essential difficulty.
As a result of the studies we have succeeded, by using fluoran compounds as a color former, in sensitizing the materials that show red-violet and various other colors by approximately 1, 000 times as much.