ゼロ点回路方式とセレン光電池について (第1報)

抄録

Recently it is usual for most cameras to possess a photocell in obtaining a suitable time of exposure. In these cases two kinds of system are used. One of these is a zero adjust system, in which a variable resistance is adjusted so as to get a constant current flow in an ammeter which is connected to the cell with series and parallel resistance. The second system is a so called E. E. system, in which a diaphragm of the camera is moved by connecting it with the axis of the ammeter, so a suitable exposure is given automatically.
In this research we wish to discuss the selenium photovoltaic cell which is used in the zero adjust system and in this report (1) we have discussed the fundamental theory on zero adjust system and a manufacturing process of selenium photovoltaic cell. We have also discussed the characteristics of cell which are required for this purpose, and have arrived at the following conclussions.
(1) There are several electric circuits which can be used in zero adjust system, but we selected the most suitable circuits from the point of view of linear relation between the illumination and the photocurrent.
(2) After discussion on the characteristics of photocell we came to a conclusion that it is desirable to obtain a manufacturing process by which the parallel resistance of cell is increased and the series resistance is decreased.