SU909659A1 - Device for producing raster pictures with non-uniform structure - Google Patents

Description

one

The invention relates to poly (graphime and can be used in reproduction devices with electronic screening of the image.

There are known devices for making raster images with an irregular structure, in which the irregularity of the structure of the raster is achieved by deflecting the exposure spot according to a random law near the nodes of the regular grid of the raster 1.

The disadvantage of these devices is reduced image clarity, due to the inconsistency between the coordinates of the analyzed point of the original and the coordinates of the point in the image.

Apparatus for producing raster images with an irregular structure are known, comprising scanners of the original and images, analyzing and recording heads, a raster-point recording modulator associated with the photoconverter of the analyzing head, a raster frequency generator and a random signal generator G2}. The disadvantage of these devices is also the reduced image clarity on raster photo-forms for the same reasons.

The purpose of the invention is to increase the even-10 bones of the resulting image.

This goal is achieved by additionally introducing a phase pulse modulator into the device, one input of which is connected to the raster frequency generator output 15 and the other connected to the output of a random signal generator, the output of the phase pulse modulator connected to the recording modulator.

20

Claims (2)

FIG. 1 is a block diagram of an apparatus for producing raster images with an irregular structure; in fig. 2 - a fragment of raster FIELD with irregular structure; in fig. 3 stress diagrams. A device for making raster images with an irregular structure comprising image scan and record nodes, consisting respectively of cylinders 1 and 2 and carriages 3 and i. The image scanning unit consists of an illuminator 5, aperture 6, lenses 7 and 8, a light filter 9, and a photoelectric converter 10. The recording unit consists of an electron-beam tube 11 and a lens 12. The output of the photoelectric converter 10 is connected to the input of a video amplifier 13, the output of which is connected to a module A torus 1 records a cathode-ray tube 11, the electrode 15 of which is connected to the output of a phase-pulse modulator 1b, whose inputs are connected to a generator 17 of raster frequency pulses and a generator 18 of a random signal. The device works as follows. The light spot formed on the original 19 is projected by the lens 8 onto the photoelectric converter 9, a signal with which, proportional to the zonal reflection coefficient, is fed to the input of the video amplifier 13. The amplified signal is supplied to the recording modulator 1. The light spot from the screen of the cathode ray tube is projected through the lens 12 of the photolayer 20. To obtain an irregular raster structure, the U-shaped raster frequency pulses from the generator 17 are fed to a pulse-phase modulator 16, to another input of which a random signal is output from The random signal generator 18. This signal can be, for example, several fixed levels, the occurrence of which at the output of the generator 18 is random and uniform, and provides the phase shift of the exposure pulses to the corresponding e fixed time value equal to 0, tT i12T. The maximum amount of shift c is set so that the center of the raster point does not extend beyond the raster image area, indicated in FIG. 2 and FIG. 3At the expense of said circuit design, there is no need for a deflecting system and the formation of special signals for controlling the spot deviation in both the synthesizing and analyzing nodes of the device. Apparatus of the Invention A device for producing raster images with an irregular structure, comprising scanners of the original and an image, analyzing and recording heads, a raster-dot recording modulator associated with the photoconverter of the analyzing head, a raster generator and a generator of random waveforms, characterized in that In order to increase the clarity of the resulting image, a phase pulse modulator was additionally introduced into the device, one input of which is connected to the generator output of a raster frequency, and the other is connected to the generator output of a random signal, with the output of the phase-pulse modulator connected to the recording modulator. Sources of information taken into account during the examination 1. USSR author's certificate No. 289785, cl. G 03 F 5/12, 1968. 2. USSR author's certificate №, cl. G 03 F 7/10, 1969 (prototype). i ri J rk L, V s f Hf A k v / A AV LL A