SU1413581A1 - Illuminator for slide projector - Google Patents

Abstract

The invention relates to an optical instrument, mainly to a projection technique, and, with relative simplicity of construction, to improve the uniformity of the frame illumination while simultaneously increasing the light flux, V-shaped mirrors 9 installed behind the light sources 15 allow one to obtain an additional two images of each source. . A condenser consists of two sets of 5.6 cylindrical lenses with mutually perpendicular curvature planes. At the same time, each source or its image in the mirror corresponds to a condenser cell formed by the intersection of two cylindrical lenses. Depending on the type of light sources, the luminous flux directly from. the light source is either used — along with reflected from mirrors — or is not used. As the light sources it is advisable to use tubular halogen lamps. about s (l

Description

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The invention relates to a projection technique, and more particularly to illuminators for powerful slide projectors intended for projection from large-format transparencies and used in large auditoriums such as theater and cinema concerts.

The aim of the invention is to increase the luminous flux of the illuminator, to improve the uniformity of illumination, as well as to simplify the design.

Figure 1 presents in expanded form the structural scheme of the illuminator installed in the overhead projector; Fig. 2 shows a section of a matrix with V-shaped mirrors and 3 a multi-compartment condenser. .

Figure 1 shows the lens 1, the frame window 2 for slide 3, the refill 4 for a multi-cell condenser made from - a set of cylindrical lenses 5 and 6 whose curvature planes are mutually perpendicular, the light source being the holder 7 compact lamps 8, between which rows there are prismatic mirrors 9 of V-shaped section, made, for example, from corrugated polished aluminum sheets. To reduce. . heating holder 7 is provided with heat-removing fins 10 cooled by natural or forced air circulation.

Plot holder 7 with three compact halogen lamps 8 nak. 2 is shown along with a portion of a multi-cell condenser containing cylindrical lenses 5 and 6, between which is placed a portion of a multi-section heat filter 11 filtering out infrared rays from the light beam passing through the slide 3. The lenses 5 and 6 and the heater 10 can be cooled from the fan. The optical filter 12 has the ability to move or rotate relative to slide 3 (Fig. 2).

The number of cylindrical lenses 5 having a plane of curvature located along the edge of the V-shaped mirrors 9 corresponds to the number of rows arranged in this direction.

lamps, namely four, while the number of cylindrical lenses 6, having a plane of curvature, located across the edges of the V-shaped grains,

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Cal 9 is twice the number of lamps arranged in this direction and is sixteen (for eight rows of lamps). This is due to the fact that the compact halogen incandescent lamps 8 have an opaque upper end opposite to the basement, due to the location at this end of the spa 13, which seals the flask. The concentrated body 14 of the filament of the lamp 8 is reflected by V-shaped mirrors 9, and from each filament 14 in a plane perpendicular to the direction of the prismatic soils. Copies 9 are formed by two reflections in the form of imaginary images 15, each of which is actually a separate source of light and must be (for increasing light output) equipped with a separate condenser lens 6.

If the upper end of the bulb 8 is transparent, then the glow through it of the glow body 14 can be considered as an independent source of light. In this case, the number of lenses 6 should exceed the number of lamps located in a plane perpendicular to the V-shaped mirrors 9, tripled. .

The cylindrical lenses 5 and 6 have a simple shape and are easy to manufacture, assemble into a single multi-cell condenser and adjust, since the attachment points of these lenses in the frame 4 can be moved out of the light. bundle and be arbitrarily large. The frame 4 is provided with a handle 16 and directions (not shown) for quickly inserting or removing a condenser from the light beam.

Claims (1)

1. Illuminator .. for overhead projector, containing a matrix of radiation sources and condensers, which in order to improve the uniformity of illumination, increase the luminous flux and simplify the design, the columns of the lamps of the radiation source matrix V-shaped mirrors are located, and each condenser is made in the form of two sets of rectangular cylindrical lenses with mutually perpendicular curvature planes located close to each other, the length of which is equal to the size The illuminator, while the number of lenses whose plane of curvature is parallel to the edge of a V-shaped mirror, corresponds to the number of lances in the row of the matrix, and the number of lenses with the plane of curvature perpendicular to the edge corresponds to twice or three times the number of lamps in the column of the matrix. 2, Illuminator pop. 1, distinguished by the fact that the source of the chen is made in the form of tubular gene lamps.