SU224A1 - Photo relay for apparatus for transmitting images - Google Patents

Description

The proposed photorelay is aimed at transmitting images to a distance.

FIG. 1 is a schematic view of a rela, and FIG. 1 a - its detail.

A glass cylinder S (Fig. 1) mounted on a massive circle 10, fastened to the axis 5, is used to transmit images at the departure station. FIG. 1, the individual parts are designated as follows: 15 — parabolic reflector, 11 — volt arc, 14 — double-convex lens, the main focus of which lies on the surface of the cylinder, 17 — selenium element supported inside the cylinder by a rod 36 attached to a rack 4, 16 is a black stripe on the cylinder, positioned so that when the prong hits the spring 9, this stripe will be in the path of the rays going through the lens 14. On the cylinder a sheet of gelatin or celluloid is glued, covered with a grid of thin black lines closely spaced from each other. friend a (e.g., on / well mm.). This can be done, for example, in the following way: a large sheet of white paper is covered with black stripes and photographed on a plate made of celluloid or gelatin covered with a photosensitive layer. A photographic image of an object that it is desirable to transmit to a distance is negatively reproduced on the gelatinous or on the celluloid plate, which is then wrapped around the cylinder (the line of attachment of the ends of the plate is more convenient to place on the black strip 16). If now the cylinder is set in motion by motor 1, then a larger, smaller number of rays and rays will not fall at all on the selenium element if there are black grid lines on the way, depending on what the current strength in the circuit changes, consisting of a current source 13, an electromagnet 18, a selenium element 17n13, a measles 20, connected by wires 55 with springs 19, will be located closer and then further from the electromagnet 8; a gear wheel 21, tightly mounted on the same axis as the measles 20, will turn either to a larger or a smaller angle; the entire approximation of the core 20 to the electromagnet is made

not immediately, but slowly, over a period of time, the greater, the greater the angle of rotation of the core, and the maximum time required to approach the core close to the electromagnet, and this maximum should be equal to the time interval during which the lens passes through the focus 14 of the lens 14 between two adjacent grid lines. This function is performed when the following conditions exist: on the continuation of the geometrical axis of the wheel 21, another axis is attached, on which a tube is put on, to one end of which a circle 22 is attached, and to another roller 23. A circle 22 connects to the wheel 21 The teeth of which are turned in the direction of approaching the core 20 to the electromagnet 18 by means of a pawl 24 (Fig. 1a) exposed to a weak spring 25. The circle 22 and the roller 23 are driven by the rotation of the gear 24 (Fig. 1 shows a combination of a belt and a gear P reduction in the same direction that the measles 20 is turning towards the electromagnet, and at such an angular speed that during the period of time during which the gap between two adjacent black lines of the grating passes through the focus of the lens, the wheel 22 would turn through that angle, which the bark 20 is turning to touch the electromagnet 18. Let us denote the length of the cylinder radius in mm. through r and the number of black lines in millimeter through a, then the number of degrees in the interval between two adjacent

360 lines of the grid -; denote

the number of degrees in the turn of the core 20 to touch with the electromagnet 8

360 through n, then n: - there will be a number, TS O,

It shows how many times the angle of rotation of the core 20 before being touched with the electromagnet 18 is greater than the angle of rotation of the cylinder when the gap between adjacent lines passes through the focus of the lens. So many times, obviously, the wheel 22 must rotate faster than the cylinder in order to meet the requirement regarding the time required for the bark 20 to approach. The reverse movement of the bark 20 is fast, and the dog 24 will slide along the teeth of the wheel 22; The movement towards the electromagnet 18 will be slowed down also because the movement of the core towards the electromagnet is not able to communicate any noticeable acceleration to the wheel 22, due to the fact that the force with which the cylinder rotates is much more than the force with which the measles are rotating. . The cylinder is driven by an electric motor via a gear or belt drive, due to which the cylinder rotates hundreds of times slower than the electric motor measles. The more transparent the elementary platform of the negative (enclosed between two adjacent grid lines), passing through the focus of the lens, the longer the current through the relay 2 to the induction coil will be closed and, consequently, the longer the electric waves will act on the receiving station. This function is performed when the following additional conditions exist: the gear wheel 21 is made from a non-conductor (for example, from ivory); holes 27 are drilled in it (fig. 1a) and fine wire is wound so that its revolutions pass through the holes and through the depressions of the teeth adjacent to the hole; then the wires are connected to the axis of the wheel 21. Thus, in the cavity of each tooth there will be a piece of wire connected to the axis of the wheel. From this axis and from the axis of the wheel 82, the wires go to the element S5 through the relay 28. With all the movement of the core 20 forward, the dog 84 will press against the wire in the cavity of the tooth, and this contact will be longer, the more transparent the elementary area of the negative, the passage through the focus lens. When an opaque pad or a black grid line passes through the focus, the above contact is broken, and the measles quickly comes back. Depending on this, then for a longer time, then for a shorter period of time, the current is closed to the relay 28, which in turn closes

the current to the induction coil, and therefore either more or less beats, the detector receives at the receiving station. The elementary space of a negative that passes through the focus of the lens and is spread between two adjacent lines of the lattice can be considered small at all points equally transparent. FIG. 1 shows a simple selenium element 17 on the way out of the lens. In reality, it is more advantageous to bring the rays out of the cylinder through a mirror and pass them through a bundle of glass round rods, which evenly distribute light on the complex selenium element proposed by Prof. The root and applied them in his apparatus, to transmit images to the distance by wire. Finally, the more transparent the elementary platform that is currently passing through the focus of the lens, the greater the number of black dots will be at the corresponding elementary platform of gelatin or celluloid, coated with a photosensitive emulsion and screwed onto the cylinder of the receiving station.

SUBJECT OF INVENTION.

A photorelay for an apparatus serving to transmit images to a distance characterized by the combined use of the following parts: a) a selenium receiver 17 (Fig. 1) connected by wires to the electromagnet winding 8; b) the specified electromagnet 8, fitted with a bark 20, mounted on an axle and retracted by springs 19 c) toothed insulating wheel 21, mounted tightly on the same axis as the measles 20, and wrapped with conductive wire so that the latter enters into each his prong; d) a conducting rolling circle 22 with a pawl 24 located relative to the gear wheel 21 so that the pawl 24 can enter its teeth and touch the wire there and connected with the shaft 3 of the cylinder, on which the transmitted pattern is wound so that by rotating this shaft, circle 22 rotates in the same direction as measles 20 when it is attracted by an electromagnet, and e) current sources 13 and 25 connected first to the selenium plate circuit and electromagnet 18 to bring the latter into action, and the second to sost boiling of a conductive circle 22, the pawl 24 and the wire wound on the toothed wheel 21 to drive the current in the local chain.

, 15 of FIG.

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, P

10 - / 17

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