SU1758627A1 - Device for discontinuous printing of color images - Google Patents

Abstract

Usage: the invention relates to kinotehnika and can be used in copiers intermittent printing color images. SUBSTANCE: copying machine consists of a light-optical system 1-3, zone filters 6-8, a shutter 10. The invention allows to increase the exposure while maintaining a high uniformity of illumination of the printed window. Zone filters 6-8 are made in the form of transparent glass discs, half of the surface of which are coated with spectrozonal dichronic interference coatings, and the disks are mounted on the shaft of the obturator 10 with the possibility of their independent rotation relative to the obturator 10 having a working blade not less than 180 ° ;. 2 Il.

Description

The invention relates to motion picture technology and can be used in film copying machines for printing inks of color images.

Intermittent color printing copiers are known in which the exposure of a photosensitive film is carried out by sequentially exposing still frames through zonal light filters mounted on a rotating obturator together with diaphragm dampers within an angle of cutout of the obturator.

The disadvantage of this type of printing is the relatively small amount of possible maximum exposures in each spectral zone.

The closest in technical essence to the present invention is a device in which

In this system, zonal adsorbing filters are installed together with the diaphragm shutters on the obturator within the angle of its cut. With the help of diaphragm blinds, the degree of overlap of windows with optical filters is independently changed by kinematic communication with control handles with scales (or with a programmable drive) „

The film is exposed to zonal light filters sequentially intersecting the luminous flux, the amount of overlapping of which is predetermined by a set of diaphragm shutters.

The advantage of such a device is to ensure uniform illumination of the printed skip, by reducing the influence of the diagonal of the light-optical system and the use of

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more stable color characteristics of the printed image.

The disadvantage of such a device is that the amount of possible exposures in each spectral zone is relatively small. This value is limited by the angular dimensions of the windows with optical filters on the obturator, since all three windows must be measured within the angle of the obturator cut-out. In addition, these windows should be separated by opaque gaps to accommodate the diaphragm shutters with fully open light filters, which corresponds to the maximum exposure.

In addition, absorbing filters are used which cut off two thirds of the light flux of the light source and use a third of the useful power of the printed lamp. Small exposures limit the maximum performance of the device.

The purpose of the invention is to increase productivity by increasing the exposure per shaft revolution.

The technical and economic advantage of the proposed invention in relation to the known one is to increase the maximum exposure in each spectral zone by about 5 times, which allows for the use of less powerful light sources and working under reduced voltage on the printing lamp, which prolongs its durability.

The purpose of the invention is achieved in that the zone light filters mounted on the shaft of the obturator are made in the form of transparent disks coaxial with the obturator, installed with the possibility of a turn relative to the obturator, the blade of which is made in the form of a sector with an angle of at least 180 °, while half of the surface of each disk are applied selectively reflecting interference coatings in different zones of the spectrum.

FIG. 1 shows a general view of the device; in fig. 2 - implementation of zonal interference filters.

The device contains a light-optical system consisting of a light source 1, a condenser 2, a collective lens 3, a lens 4 and a printing window 5. The device consists of zonal interference lights

Filters: blue reflections 6, green reflective 7, ground reflection 8, which are made in the form of glass discs, on the half of the surface of which the corresponding interference coatings are applied (area A, fig. 2). The rims 9 are fixed on the disks, the scales are engraved on the cylindrical surface of which. The obturator 10 is rigidly mounted on the shaft 11, at the end of which gear 12 is fixed, which is associated with drive kinematics (not shown). The obturator j 10 has a cylindrical groove, inside which there are discs with rims. The obturator has a working blade with an angle of 180 °, and in the cylindrical groove there are three through-grooves at an angle of 180 ° each. Near the grooves on the cylindrical surface of the obturator there is a reading index (not shown). The installed fastening screws 13 with a knurled head pass through 5 slots 14 and are screwed into the rim of the optical filters from the light filter disks 6, 7, 8 and the obturator 10 are located at an angle tf to the axis of the optical system (U 45 - 90 ° for operation) 0 according to which interference coatings are calculated) „

The device works as follows.

The light flux from the light source 1 through the condenser 2 and the collective lens 3 is guided through the obturator 10 to the zone interference filters 6, 7, 8. Each of the filters produces a spectral separation of the light beam, reflecting one spectral zone (for example, red). the other two zones (blue and green). The reflected red zone freely passes through the other two filters — the green reflecting 7 and the blue reflecting 8 — because these filters pass the red spectral zone of the light beam.

Thus, all the filters 6, 7, 8 work. The reflected parts of the light flux are output from the optical system. After passing through the curtain 10 and the light filters 6, 7, 8, the portion of the light flux by the lens 4 is directed to the printed window 5. Changing the ratio and the amount of red, green and blue light transmitted to the printed window 5, the printing light is corrected. Quantity change

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the transmitted light is produced by turning the corresponding light filter 6, 7, 8 relative to the blade of the obturator 10 (Fig. 2).

If a is a zone with an interference coating, and b is a transparent disk area without a coating, then the exposure time of each frame in the corresponding spectral zone is determined by its passage through the light beam of the transparent disk zone with a central angle I while rotating the shutter with the disks. This angle can vary from 0 to 180 °. At an angle of 180 °, a disk with 5 screws and a coating will be under the blade of the obturator. This position corresponds to the maximum exposure in the corresponding spectral zone. By turning the disks 6, 7, 8, 20 relative to the shutter 10, the angle varies according to a predetermined program.

The drawings show a variant of the device with a different installation of the position of the optical filters.

The light filters 6, 7, 8 together with the frames 9 are placed in the guide cylindrical groove of the obturator. When loosening the screw 13, it is moved along slot 14, turning the corresponding frame with a light filter at a predetermined angle, measured by ho scale division on the frame 9, aligned with the index on the cylindrical

When the device is operated in a copier, the obturator and the light face rotate as a single unit.

The spectral composition of the light of the previous and reflected beam will be complementary, which can be used for spectrometric control in the automatic color correction print.

The increased uniformity of illumination of the printing window is achieved more than a year by reducing the influence of the optical system diaphragm since the system has a full aperture for a large part of the exposure time (the light beam is smaller than sector B) The color synthesis of the printing light of this apparatus is subtractive.

Claims (1)

The quality of color separation is achieved due to the high spectral characteristics of the interference light filters. Invention Formula A device for intermittent printing of color images containing an optical system with zonal coupling filters mounted on the shaft of the obturator, characterized in that, in order to increase productivity by increasing the exposure per shaft revolution, zonal light filters are made in the form of transparent disks coaxial with the obturator installed with the possibility surface of the obturator 10. After the turn of 35 Turning relative to the obturator, the gate screw 13 is turned and fixes the light filter relative to the obturator 10. Thus occurs the blade of which is made in the form of a sector with an angle of not less than 180 °; in this case, half of the surface of each disk contains selectively reflecting coatings in different zones of the spectrum. ka necessary copy light. When the device is operated in a copier, the obturator and light filters rotate as a single unit. The spectral composition of the light transmitted by the reflected beam will be complementary, which can be used for spectrometric control in automatic print color correction systems. The increased uniformity of illumination of the printed window is achieved by reducing the influence of the optical system diaphragm since the large part of the exposure time the system works with a full aperture (the light beam is smaller than sector B). The color synthesis of the printing light in this apparatus is subtractive. The quality of color separation is achieved due to the high spectral characteristics of the interference light filters. Invention Formula A device for intermittent printing of color images containing a light-optical system with zonal light filters mounted on the shaft of the obturator, characterized in that, in order to increase productivity by increasing the exposure per revolution of the shaft, the zonal light filters are made in the form of transparent disks coaxial with the obturator installed with an opportunity Reversal regarding the obturator, the blade of which is made in the form of a sector with an angle of not less than 180 °, while interference coatings selectively reflecting in different zones of the spectrum are applied to half of the surface of each disk. TO / 3 Light beam AT