SU923886A1 - Photosetting machine projection system - Google Patents

Description

The invention relates to the printing technique ^ namely the photon · boric machines.

Known projection system photocomposer machine comprising a light source, a condenser ,, mechanism ⁵ You are a font boron track comprising a field diaphragm and an associated kinematically prism means to change the stroke drive beams disposed between shriftonositelem photocomposer machine and the prism font selection mechanism tracks , a mirror for outputting rays to the main optical axis, a zoom mechanism for shooting and a scanning mechanism [1].

The disadvantages of the known device are the instability of the quality of the whole produced set, the pronounced irregularity of the optical density of the center and ‘edges of the photographed signs, and the technological limitations in the use of photographic materials with different photosensitivity.

2

The purpose of the invention is to improve the quality of the reproduced image and increase technological capabilities.

This goal is achieved by the fact that the projection system of a photosetting machine, containing a light source, a condenser, a font track selection mechanism, including a field diaphragm and a prism kinematically associated with it, means for changing the beam path located between the font carrier of the photosetting machine and the prism of the selection mechanism a font track, a mirror for outputting rays to the main optical axis, a zoom mechanism for shooting and a scanning mechanism, has an additional field stop made with an adjustable the width of the exposure window and installed between the font carrier of the photosetting machine and the means for changing the course of the rays, and the field diaphous is 923886

font selection ragma

the track is installed directly behind the beam path change tool

FIG. 1 given the projection system of the photo-diagonal machine; Fig.2Fragment of the projection system in a perspective view; in fig. 3 "drawing of the sign field; Fig. 4 - diagram of the location of the sign field at the initial moment of exposure.

The projection system of the photo-diagonal machine contains a source of light 1, a condenser 2, a font carrier 3, an additional field stop 4 with an adjustable width of the exposure window, the height of which corresponds to the number of font circles, and the width of the aperture is determined by the following inequality

where is the width of the exposure window;

K - radius of a circle (external) font carrier:

Ζ - the number of sign fields on the circumference of the font carrier;

η is the pictorial field of the mark, equal to the width of the pattern of the widest mark (fig.Z);

Μ ή - the width of the side shoulder of the mark, which in some cases is equal to O,

means for changing the course of the rays the correct many-sided prism 5, with a drive, the mechanism for selecting a font track, making a choice

- an exhibited mark (FIG. 2), with a field diaphragm 6 and a prism 7, a block of vertically positioned lenses 8 and a mirror 9 for outputting rays to the main optical axis, a zoom mechanism for shooting with an aperture diaphragm 10, a lens'! 1 and a prism 12, a scanning mechanism with a scanning element 13, a photographic material 14 moved by a cassette mechanism.

The device works as follows.

When the required mark falls into the exposure zone (FIG. 4, 1), the light source 1 is turned on, the luminous flux of the condenser 2 is concentrated in a light spot illuminating the font circles on the font carrier 3 (in one of them a projected sign is located) with a font carrier 3, it scans with a conjugated pair of faces. Through the aperture field 4, the highlighted sign. The rays

• those carrying the image of the mark are refracted by the prism 5, pass through the window of the field diaphragm 6 and the lens 8, fall on the prism 7 and the mirror 9 reflects through the diaphragm 10 on the lens 11. After the lens 11, the rays passing the prism 12 are positioned by the ₁₅ unwinding element 13 on the photosensitive layer of photographic material 13. At the time of withdrawal of the sign of the font carrier 3 from the exposure area, the light source 1 is turned off.

²⁰ The use of the invention in industry allows improving the quality of the reproducible set and expands the technological capabilities of devices of this class.

Claims (1)

Claim Projection system of photo-diagonal ³⁰ machines, containing a light source, a condenser, a font track selection mechanism, including a field diaphragm and a prism kinematically connected with it, means for changing 35 paths of beams with a drive, placed between the font carrier of the photosetting machine and the prism of the font track selection mechanism, a mirror for outputting beams to the main optical 40 axis, zooming mechanism and scanning mechanism, characterized in that, with the purpose of improving the quality of the reproduced image, it has 45, an additional field diaphragm, made with an adjustable width of the exposure window, is installed between the font carrier of the photosetting machine and the means for changing the paths of the ray, and the field diaphragm of the font selection mechanism is installed directly behind the V means of changing the ray paths.