SU1883A1 - Bishop - Google Patents

Description

The present invention is intended to serve small audiences by projection of displayed objects or opaque paintings. In the schematic drawing of FIG. 1 shows a episcope with two reflecting surfaces of elliptical cross section and two circular sections, FIG. 2 — with one reflective semi-ellipsoid rotation and a saline hemisphere; FIG. 3 is a variant of the device shown in FIG. 2, with a device that protects the projected object from heating; FIG. 4 - with a reflective ellipsoid of rotation with a cut side surface. In the proposed episcopes, the reflecting surfaces of the elliptical section are used as reflectors illuminating the projected object in order to increase the light utilization factor, in view of the ellipse's property of collecting rays coming from one focus, in another focus. With such reflectors, the light source 5 is placed in the focal line of the elliptical cylinder / or in the focus of the ellipsoid that replaces this cylinder, and the designed object is placed on the stand 4 in another focus or focal line of the reflector. uniformity, it is possible to apply two identical elliptical reflectors 1, 1, which slide one over the other with the second foci, with corresponding cutting off the overlapping parts (Fig. 1). To use the light rays coming from the illumination source 5, 5 back, additional 2, 2 are placed behind the first two reflectors, in the form of a semi-cylinder with circular sections or hemispheres with their centers aligned with the light sources. Reflecting along the radii, the rays of light from the secondary of the reflectors 2, 2 pass through the foci of the first reflectors /, 7 and are attached to the general illumination obtained from the elliptical reflecting surfaces. A prt-like episcope device designed to enhance the light and its greater

- 2 - with objectiv 3, the object perceives light from all directions of the solid angle of the light source, and not just from one small cone. The ellipsoidal surface gives a great effect, but the cylindrical one can be used only because of the ease of manufacture and, consequently, cheapness. The device can be used with an ordinary set of reflectors, front and rear. The object is then placed at an angle to the axis of the ellipse and in front of the second focus, close to the cut-off surface of the reflector, and projected through a hole against it. With an ordinary set of reflectors, the projected object can be placed in front of objective 3 not in the free focus of ellipsoid 7, but in front of it, intercepting the luminous flux reflected from the light source to the focus in its wide part, for which part of the reflecting ellipsoid 7 is cut off by a flat section, passage through the center of the ellipsoid (Fig. 2). With this arrangement of the projected object, a greater uniformity of illumination and an increase in the brightness of the projected image is obtained, since a certain solid angle is created with the beam of rays directly, without reflection from the reflector, illuminating the subject of the projection; the back surface of the reflector and the object form a plane, which makes it possible by gradual sliding to design images of any size. In addition, the entire device is made more compact and lightweight. To reduce the heating of the object from the hot air convection currents, the device is positioned so that the light source 5 is at the top, as shown in FIG. 3, and in front of it, below it, a glass plate or cuvette 6 with running water is horizontally positioned. The reflecting surface can be, in the form of an ellipsoid of rotation 7. In one of the focuses of which is placed the light source 5. And on the way and closer projection does not cause a significant deterioration in the work of changing two reflecting semi-cylinders 7, 7 with elliptical section and located on their focal lines of light sources 5, 5, and secondly, the combined focal lines of which semi-cylinders are placed against the objecte 3 of the stand 4 for direct driving. In order to increase the illumination of the designed ancestors to another focus, the episcope uses objects or their images to be projected on the screen 4. The projection is made by objective 3 through the corresponding slot in the side wall of the ellipsoid (Fig. 4). The ellipsoid is cut by a flat cross-section obliquely and together with the projected plane forms a closed area. The closedness of the reflecting surface and the ellipsoid property, when reflected once, direct all the light rays from one focus to another create a full use of the light flux in all directions of the taken angle of the light source. The indicated completeness of the use of light makes it possible to apply weak light sources to the design, and the entire device to be made small and convenient to carry. Some of the irregularities in the illumination created by the glass sheaths of the lamp in the course of the rays from the steep part of the ellipsoid are eliminated by placing absorbing no; ioc on the reflective surface in places creating distortion. Instead of the reflective surface having the shape of an ellipsoid of rotation, in the device shown in FIG. 4, it is possible to use a cylindrical surface with an elliptical cross section, which, according to the author, with a reduced size of the bishop's device, and at the same time making it easier to manufacture. SUBJECT OF THE PATENT. 1. The bishop characterized at 2. When characterized in paragraph 1 of the bellows, two reflecting semi-cylinders 2, 2 with a circular cross section and axes coinciding with the location of the light sources 5, 5 and with radii of circular cross sections equal to the shortest focus distance of the elliptical cross section from the reflective surface. 3. Change as described in p. Episcopes 1 and 2, characterized by the use, instead of two reflecting semicylinders 1.1 with an elliptical section, two semi-ellipsoids of rotation, and instead of additional semi-cylinders 2, 2 with a circular section, two reflecting hemispheres. 4. The change of the bishop described in paragraph 3, characterized by using the face of one ellipsoidal reflecting surface 1 with the light source 5 and one reflecting hemisphere 2 located in one of its focuses, in which the episcope the projected object 4 is placed in front of the second focus of the ellipsoid of rotation 1 against the objectifier 3, the surface of the ellipsoid is cut off by a plane passing through the center of the ellipsoid. However, in order to reduce the heating of the designed object, the glass plate 6 or a horizontally disposed cuvette with running water, placed in front of the light source 5. in p. 3 and 4 episcopes, characterized by the use of a reflective surface in the form of an ellipsoid of rotation with a cut off side, in which the light source is placed at the focus, and the cut used to attach objects objectified to it. in p. 6 of the episcope, characterized by the use instead of an ellipsoid-shaped rotation, a cylindrical reflecting surface with an elliptical cross section. 1925 and pp 6 and 7 of September 19, 1925. 5. In the characterization described in clause 4 of epi6. The change was characterized 7. The change was characterized by the priority p. 4 and 5 from 9 sep. Br

T lo-Lithograph 4: Red Pechatnik Leningrad, International, 75. patent

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