The lamp changes color. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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The lamp changes color. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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Yellow, almost sunlight, floods the book lying under the table lamp. Easy and enjoyable to read; but an hour, an hour and a half passes, and you notice that this color scheme is starting to get boring. Correcting the situation is very simple: you turn the control knob, and the color of the lampshade gradually changes. You can choose any color from the solar spectrum - from red to dark blue, and you can change not only the color itself, but also its saturation.

This is how the light filter I developed for the lamp works. The principle of its operation is based on subtractive subtraction of colors, and its fundamental difference from many others is that I used liquid dyes of three colors - yellow, purple and blue.

The design of the filter is shown in Figure 1. The cylindrical body contains four colorless glasses, three of which can move along its axis. The glass is moved by cam rings. Thus, by rotating them, you can change the gap from zero to maximum between any two adjacent glasses.

The lamp changes color
Rice. 1. Light filter device: 1 - cover, 2 - body, 3 - fixing screw, 4 - cam ring, 5 - bracket, 6 - spring, 7 - screw, 8 - sealing cord, 9, 10 - filling hole and plug screw , 11 - liquid dyes, 12 - glass, 13 - polyethylene cavity.

Liquid dyes of the required concentration fill the space between the glasses. By changing the gap, we thereby change the color saturation or, in other words, the density of the corresponding color. Well, since combinations of any two of the three main subtractive colors of different densities give all the colors of the spectrum, the total color is determined by the ratio of the thicknesses of the layers of liquid dye, and the color saturation is determined by the thickness of the layers.

As a dye, I used solutions of chromium (K2CrO4) - (yellow), potassium permanganate KMnO4 (magenta) and blue ink "Rainbow" for fountain pens. Their concentrations are chosen arbitrarily.

Glass, preferably organic, has a groove around the circumference, designed to secure polyethylene bellows with its help, compensating for the excess volume of liquid when the glasses come together. The fur itself is not difficult to make: the appropriate number of rings are cut out of polyethylene film, and their edges are welded by heating.

The lamp changes color
Rice. 2. Polyethylene fur device

That's all, actually. I deliberately did not touch upon the issues of installing such a light filter on a lamp - in each specific case the connection will be carried out in its own way.

Author: A.Pirogov

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