SU1275357A1 - Blue-printing machine - Google Patents

Abstract

The invention relates to printing production, in particular to photographic reproduction equipment used for contact copying from black-and-white and color negatives or slides, and can also be used in photo sections of form shops for color separation works. The purpose of the invention is to improve the quality of copying and simplify the design of the device. The diffuse illumination lighter is made in the form of a diffuser consisting of a conical mirror reflector 8 and an annular disk light guide 9, —The concentric light-scattering grooves 10 are made on the mirror surface of the light guide 9, the width and depth of which is directly proportional to their radius, which allowed to get uniform distribution (L illumination on the originator 13. In accordance with the type of regularity of the luminous flux, the operating mode of the photocopier frame is chosen - from a point or diffuse,;

Description

illuminator. In the mode of operation from a point illuminator, introduced into the light flux from a gas discharge lamp, formed into a parallel beam of light with the help of a reflector 2 and a lens 3. The light passes through a light filter 12 and a two-convex. Lens of the point illuminator. A double-convex lens projects a matte plate lying in its focal plane onto the originator 13. The brightness of the matte plate 6 is proportional to its transparency. Different values of transparency (brightness) compensate for uneven illumination due to differences in the angles of incidence of light.

75357

to different points of the originator 13. In the operation mode from diffuse

the illuminator introduces a cone mirror reflector 8 into the light flux, and a point illuminator 4 is outputted by turning the lever 7. A parallel light beam passes through the central hole of the annular disk light guide 9 and hits the reflector 8. The reflected light is scattered on the grooves 10. The intensity of the light flux is controlled by the unit adjusting the luminous flux, made in the form of the sensor 15 and the unit 14 of the luminous flux. 2 hp f-ly, 5 ill.

The invention relates to printing production, in particular, to photo reproduction equipment used for contact copying from black-and-white and color negatives or transparencies, and can also be used in photo compartments of form factories for color separation.

The purpose of the invention is to improve the quality of copying and simplify the design.

FIG. 1 is a schematic diagram of the device of FIG. 2 is a schematic of an illuminator for directional lighting; in fig. 3 is a schematic of a photocopier machine using a directional illumination light; FIG. 4 is a schematic of the device using a diffuse illuminator; in fig. 5 is a diagram of a ray path in a directional illumination illuminator.

The blueprint machine contains a gas discharge lamp 1 with a luminous flux control unit installed between the reflector 2 and the lens 3, above which the illuminator 4 of the directional illumination is located. The illuminator 4 of the directional illumination consists of a double-convex lens 5 and a matte plate 6. The illuminator 4 of the directional illumination is mounted on one end of the V-shaped lever 7, hinged

fixed on the basis of the machine. At the other end of the lever 7, a conical mirror reflector 8 is fixed, which is part of the diffuse illumination illuminator. The diffuse illumination lighter also contains a circular disk light guide 9 fixedly mounted on the base. The light guide 9 has annular light-scattering grooves 10 cutting through the mirror surface of the light guide and the light-receiving ring 11. Between the circular disk light guide 9 and the illuminator 4 of the directional illumination there is a block 12 of light filters installed rotatably around an axis fixed to the base of the light-copying machine (not shown). Above the light guide 9, on the side of the light scattering grooves 10, there is an original holder 13 mounted on the base.

To set the required luminous flux, the luminous flux adjuster 14 serves, and for detecting the magnitude of the real luminous flux - sensor 15, included in the luminous flux control unit. In addition, the power supply unit 16 of the lamp 1 is included in the control unit.

To perform color separation requires the selection of narrow spectral regions, and for copying

It is necessary to allocate the ultraviolet region of the spectrum to the plate plates. The selection of the required spectral region is carried out by placing the unit with light filters 12 in the required position.

The operation of the blueprint machine in the illumination mode of the directional illumination illuminator is as follows.

The light flux from the gas discharge lamp 1 with the help of the reflector 2 and the lens 3 is formed into a parallel beam of light. The light passes through the directional illuminator 4, introduced into the luminous flux, and the required optical filter 12. In this case, the dual lens 5 projects to the originator 13 a matte plate 6. The brightness of each point of the plate 6 is directly proportional to the transparency of the plate at the same point. The transparency of plate 6 in the caddy point is determined from the ratio

 SS J

cosV

which follows from the following considerations.

The luminous flux from the elementary platform M lying on the optical axis of the system on the surface of the plate 6 is collected by the lens 5 and the pupil area of the lens 5 is projected by the distance from the plane of the lens to the elementary area of the luminous flux in a unit angle coming from plate 6. In this case the illumination per square Mj will be E, respectively. The luminous flux coming from the area N is equal to SI M N0 where r is the distance from the area N of the center of the lens, but because of the triangle NMO, then c is the sycNo / NN0

and the illumination of the elementary area N is equal to

EAT. 1. NofrcosV (5)

with uniform illumination of the original 13

EN, E ,,. (6)

then from (1) and (5) we get

INO (7)

-,

Expression (7) is a condition for the uniformity of illumination of the ori ginal holder 13.

Then, if plate 6 is illuminated by a uniform luminous flux 1, then

  ID

MO

(eight)

INO N I ..

where t and G is the plate transparency

.M p

6 at points M.

From the conv: ovi (7) I

N0 wa (8), we get N COSV Prien in 1, 1, we get - 1. N Thus, the transparency of plate 6 at points remote from the elementary platform M will be determined according to the law specified in expression (9). The unevenness of brightness at different points of the plate 6 compensates for changes in the illuminance of the surface of the originator 13, arising from the difference in distance from the illuminator 4 to different points of the originator 13. Different values of brightness compensate for the unevenness of illumination caused by different points of the originator 13.

In the mode of operation of the blueprint machine from the diffuser illuminator, the illuminator 4 of the directional illumination is removed from the luminous flux zone by rotating the lever 7 and the conical mirror reflector 8 is placed into the luminous flux from the discharge lamp 1, with the annular disk light guide 9 placed behind it. formed by the reflector 2 and the lens 3, passes through the desired filter 12 and through the central hole of the light guide 9. From there, the light flux enters the conical mirror reflection Tel 8. The reflected light through the light receiving ring 11 gets inside the annular disk 9 and the optical fiber propagates through it, dissipating Referring to the grooves 10. Each groove 10 thus is an annular light source. In order for the brightness of all the grooves 10 to be the same, the width and depth of the light-scattering grooves 10 vary directly in proportion to their radii. In this case, the distribution of illuminance on the originator 13 (original) is uniform, close to the illumination obtained from a uniformly illuminated surface.

The intensity of the magnitude of the light noTojsa is regulated by a unit for the registration of the light flux. The sensor 15 registers the real value of the luminous flux. In the power supply unit 16 of the gas discharge lamp 1, the signals from the luminous flux adjuster 14 are compared, and depending on the magnitude and sign of the difference of these signals, the luminous flux changes so that this difference constantly tends to zero. When this occurs, the light flux is also stabilized at the level set by the setting device 14.

After the original is placed on the original 13, contact copying and color separation are performed.

Claims (3)

Claim 1. A photocopier machine comprising an original holder mounted on the base, diffuse and directional illuminators, a light filter unit and a luminous flux control unit connected In order to improve the quality of copying and simplify the design, the diffuse illumination illuminator is made in the form of a diffusor consisting of a conical specular reflector and a circular disk light guide with a specular surface on which the side facing the document holder is concentric light scattering grooves, the width and depth of which are directly proportional to their radius, and the directional illumination illuminator is made in the form of a two-convex lens and located in its focal plane matte plate, the transparency of which at each point is determined by where oL is the angle between the optical axis of the system and the direction from the center of the lens to the point of the matte plate, while the mirror reflector and the illuminator of the directional illumination are located at the ends of the V-shaped lever mounted rotatably in a plane perpendicular to the optical axis. 2. The machine according to claim 1, wherein the light source is in the form of a gas discharge lamp, the emission spectrum of which lies in the visible and ultraviolet region of the spectrum. 3. The machine according to claim 1, wherein the luminous flux control unit is configured as a sensor and a luminous flux sensor and a power supply unit of the light source included in the circuit with negative feedback for luminous flux.