Method for electrical illumination for prolonged, continuous, and straining visual work and circuit for controlling the light intensity of the electrical illumination for prolonged, continuous, and straining visual work

摘要

The method, according to the invention, for the illumination consists in that an electrical non-uniform illumination is used for visual work, the light intensity (E) of which illumination is increased as a function of time from the initial value of the light intensity (Ep) which has to be equal to at least the minimum value (Emin) specified for the respective visual work up to the final value of the light intensity (Ek), the initial light intensity (Ep) being programmed from more than 1 up to 10 while maintaining the ratio of the final value of the light intensity (Ek) to the initial value of the light intensity (Ep), after which the light intensity (E) decreases as a function of time from the final value (Ek) to the initial value (Ep) during the decreasing phase (T2) of the light intensity (E), which decreasing phase is shorter than the period of the increasing phase (T1) of the light intensity (E), the period of each phase being programmed independently and the overall region of the programming of the period of the increasing phase (T1) of the light intensity (E) lying within the limits of between a few tens of seconds up to a few tens of minutes and the two-phase cycle of the changes in light intensity being repeated a plurality of times using the programmed values. The circuit for controlling the light intensity of an electrical light source is ... of a sampling transistor (1) connected into the mains supply circuit in series with the light source (2), a transducer (9) of the voltage into the pulse width, an integrating circuit constructed from parallel connected [lacuna], an operation amplifier (13) and a capacitor (19), from ... Original abstract incomplete. IMAGE