A lenslike glass fiber optics with a parabolic variation of refractive index has been developed. This light-focusing fiber optics named SELFOC**** ® has the characteristics that anoptical image transmission and realization of a lens with tiny aperture or with extremely short focal length are possible.
In this paper, we discuss theoretical and experimental properties of this light-focusing fiber optics from the point of view that the array of this fiber optics (multi-lens) can be used as an optical system in the optical data processing.
From the experimental results, light transferred characteristic of multi-lens is pointed out to be well compared with typical spherical lens and the contrast of spatial frequency characteristic is estimated approximately 0.5 at 10 lines/mm.
For the application of this multi-lens, the main obstacle is chromatic abberration and now the improvement of glass material has been done.

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The model and related formula for the surface corona charge decay process of the zinc oxide-resin layer have been studied.
The experimental results show agreement with the formula derived from the model.
The aptitude of the model to the surface charge decay process have been discussed to analyse the formula.

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Sensitized photocurrents were investigated in poly (N-vinylcarbazole) (PVK) films (~10 µ) on which thin dye layers (~0.1 µ) were deposited by means of vacuum evaporation. The porarity of majority carrier was found to be positive as well as in the non-sensitized photocurrent. A large spike was observed at the initial stage of photoconduction. This was attributed to a result of photoinduced charge transfer between the dye and the polymer. With rhodamine B as a typical of n-type dye, electrons were injected from the dye to PVK, while with pyronine G, a p-type dye, the spike appeared with the opposit polarity. The magnitude of these spikes were almost unaffected by the applied voltage. Oxygen or other electron acceptors depressed the spike and upraised the sensitized photocurrent. A sensitizing mechanism was proposed in which the electron injection from n-type dye layer to traps in PVK layer precedes the hole injection, the main process of sensitization. This electron injection was presumed to facilitate the hole injection by compensating the local field existed at the dye-PVK interface.

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