SU1720055A1 - Photographic screen - Google Patents

Abstract

The invention relates to devices for framing images in photo printing, for masking image elements in imprinting and shading, for viewing and reproducing photo images on a transparent substrate and for exposure metering for photo printing. The photo screen includes a composite base consisting of a peripheral module 1 and a removable central liner 2, and a hinged masking device 3 relative to it. The peripheral module 1 is L-shaped, is the main carrier part of the photo screen and contains stops 4 and handles 5. Insert 2 is inserted into the module 1 in slots. Handles 5 serve as basic elements for attaching the holders of devices for complex photo printing techniques. In various embodiments, the insert 2 implements the functions of a reflective screen — a base, a projection light screen, and a photoreceiver. 2 hp ff, 8 ill. cl

Description

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The invention relates to photographic equipment, namely, devices for framing an image during photo printing, for masking image elements during printing and shading, for viewing photo images on a transparent substrate, for exposing with projection photo printing, and for performing other operations occurring during photo printing design and reproduction with a photographic enlarger.

A photo screen is known, the base of which is a sheet of magnetic rubberized material. Along the perimeter of the base there are profiled limiters. The photosensitive material, the dimensions of the sheets of which are slightly larger than the internal dimensions of the limiters, is located on the base of the photo screen under the limiters that make a reliable clamping. The size of the photoprint is set with light-proof dampers, the number of which may be 4, 8 and 16. The upper side is made in white and the bottom. - gray.

The disadvantage of this photo screen is its suitability for obtaining only a few fixed formats of the field of the image photoprint, the number of variants of which is not enough to practice.

Another disadvantage of the photo screen owner -. It is impossible to obtain a width of the unexposed edging around the image floor of the photo imprint.

In addition, the photo screen does not allow for many other basic photo printing operations, in particular image masking and metering.

In addition, the photo screen is not suitable for viewing a photo image on a transparent substrate, as well as for reproducing by the enlarger images on transparent and opaque substrates.

As a result, there is a reduction in the quality and performance of photo printing and a reduction in the functionality of this photo screen.

Closest to the invention is a photo screen, which is a base with supports for photographic material and an articulating masking device mounted on it. The base is made in the form of a frame, the upper surface of which is a working table with a screen of a light-receiving chamber. The luminous flux from the photographic enlarger lamp, the passage through the negative and photographic paper, enters the light receiving chamber, which allows the register

Expose exposure. Exposure metering in a plot of an important part is provided by moving the photodetector in the light-receiving chamber.

The disadvantage of this photo screen is its inability for such photo printing techniques as imprinting and shading, involving the use of masks and back masks.

0 Another disadvantage is the inability of the device to scan photos on a transparent substrate, as well as to reproduce originals on transparent and non-transparent substrates by a photographic magnifier.

These disadvantages lead to a decrease in the quality and productivity of photo printing and to relatively low functionality of the device.

0 The purpose of the invention is to improve the quality and performance of photo printing while simultaneously expanding the functionality of the device.

The goal is achieved by the fact that

5, a screen with a base with stops and a masking device hinged relative to the base, the base is made composite, containing a peripheral module and a removable central core. In this case, the peripheral module is U-shaped with the possibility of installing a removable central liner in it. The central liner is designed as a reflective

5 screen or in the form of a lighting screen, or in the form of a measuring device. The central liner and the peripheral module are provided with means of their fixed attachment to each other.

0 At the same time, the peripheral module is equipped with handles installed on its two mutually opposite side faces. In addition, the handles are provided with removable holders for variable

5 lengths.

FIG. 1 schematically shows the proposed photo screen with a masking device in a position open at 90 °, top view; in fig. 2 - the same. front view: on

0 fig. 3 - photo screen with fixture holders in the working position; Fig. 4 shows an embodiment of the central insert in the form of a flat illuminator; in fig. 5 shows an embodiment of the central contributions 5 sha in the form of a photo-measuring device; in fig. 6 - device of two-coordinate movement of the light probe; in fig. 7 - telescopic fixture holder; in fig. 8 - multi-unit fixture holder.

The photo screen includes a composite base consisting of a peripheral module 1 (Fig. 1 and 2) and a removable central liner 2 and a hinge masking device 3 installed relative to it. The peripheral module 1 is made U-shaped hollow, made for example by stamping from thick sheet metal, providing rigidity to the product. Peripheral module 1 is the main carrier of the photo screen. Composite elements of the photo screen (interchangeable central liners 2) and external photo lab devices (photo lab laboratory lamp, photographic magnifier) are joined with it. Most of all elements of the photo screen are installed on it, in particular, stops 4 and handles 5. On the inner side faces of the peripheral module 1, for example, grooves 6 are made (FIG. 2). along which a central core 2 can be inserted and secured into the peripheral module 1. The grooves b and the protrusions corresponding to them on the lateral faces of the central insert 2 are one of the possible means of fixing the central insert 2 and the peripheral module 1 to each other fixedly. It can be inserted along the grooves b in the peripheral module 1 up to the stop with the frictional fixation of its end position (fixation by jamming). However, other specific means of fixed attachment of the friend to the other of the central insert 2 and the peripheral module 1 are possible. On the back panel 7 (Fig. 1) of the peripheral module 1, there are organs for connecting external photo lab equipment 1 (photo zoom photo phono lamp), power switch and fuse holder (not shown). The parallel panels 8 of the peripheral module 1 and the central liner 2 are equipped with elements of electrical detachable connections (not shown) providing electrical communication for the module 1 and the liner 2. The stops 4 are made in the form of two mutually perpendicular planks installed near an internal angle peripheral module 1. Handles 5 are made, for example, in the form of two linear elements and fixedly mounted with four brackets 9 on. two opposite (short) side edges of the peripheral module 1, the length of the handle 5 approximately corresponds to the width of the peripheral module 1. The handles 5 are the most protruding left and right elements of the photo screen. At the same time, the handles 5 serve as basic elements for fastening removable holders 10 (Fig. 3) fixtures 11 for sophisticated photo printing techniques. For this, the grips 5 contain elements 12 (FIG. 1) fastening the holders 10 to them 5. At the rear ends of the grips 5 there are, for example, sliding bearings (not shown) in which the axis of rotation of the masking device 3 is attached. The masking device 3 10 is made according to any known scheme and includes, for example, a rectangular frame formed by four guides 13 (Fig. 2), each of which has a movable ruler 14. Each of the replaceable 15 interchangeable central liners 2 (Fig. 1 and 2 ) has a rectangular shape and performs in a photo screen. not konkretnuyufunktsiyu .diktuemuyu- photographic practice. 0 In the first embodiment of the central insert 2, it implements the function of a reflective screen, which is used for focusing and framing 5 before exposing the photographic material and to which the photographic material is pressed during the exposure. In the central insert 2, in order to provide sharp focus, at least one of its two parallel flat surfaces 15 0 (Fig. 2, 3) is made in the form of a reflective screen, i.e. white diffuse reflecting light. In the same liner 2, its second flat surface 16 can also be made working.

5 In the second embodiment of the central insert 2 (Fig. 4), it implements the function of an illumination screen providing lighting of photo originals (negatives, transparencies) to the light for viewing, retouching, reproduction, dosage illumination and other photographs. One of the embodiments of the lighting screen is a flat illuminator, made in the form of a box-shaped 5 body 17, the upper panel 18 of which is transparent and illuminated by the light of the sources 19 passing through the diffuser. 20. The specific implementation of a flat illuminator may be different. 0

In the third embodiment of the central insert 2 (Fig. 5), it implements the function of a photo-measuring device intended for exposure metering 5 or under projection photo printing. A photographic device allows you to automate the time-consuming process of determining exposure in photo printing using a photo enlarger.

The device includes a box-shaped housing 21

with a translucent upper facet 22 and a light probe 23 below it installed with the possibility of its two-coordinate movement. To ensure the movement of the light probe 23, there is a special control element (FIGS. 5 and 6), made, for example, in the form of a pivot arm 24, at one end of which a light probe 23 is fixed, and on the other hand grip 25. The lever 24 is adapted to adjusting the length of your shoulder. The lever adjustment unit of the lever is made in the form of a rod 26 (FIG. 6) placed in grooves in the walls of the hollow rotation axis 27 fixed to the housing 21 by means of a sliding bearing 28, which can be rotated. The photodetector provides the ability to install the light probe 23 at any place under the translucent upper edge 22 of the central liner 2.

The removable holder 10 (Fig. 3) of the devices 1J is made as an element of variable length, for example, telescopic (Fig. 7) or multi-link (Fig. B). The holder 10 in the form of a telescopic rack (Fig. 7) is formed by solid and tubular links 29 with a series of through holes 30 for fixing pins 31, serving as fasteners for Links 29. The multi-link holder 10 (Fig. 8) is formed by solid links 32 with p Dami through holes 33, designed to install the fixture fixtures. The end portions of the links 32 are made in the form of elements of a detachable connection, for example threaded. The fastening elements of the holder 10 (Fig. 3) of the adaptations to the handle 5 of the photo screen are made in the form of elements of a detachable connection, for example, a bayonet (not shown) or threaded 34 (Fig. 7, 8). The upper link holder 10 (Fig. 3) contains the latch 35 devices, made according to any known scheme. In particular, the latch 35 can be made in the form of a clip (clothespins), one shoulder 36 of which is made in the form of a pin that fits into the hole 30, 33 (Fig. 7, 8), and the other shoulder 37 (Fig 3) is a dovetail tail, covering on both sides of the holder 10 fixtures.

Photo screen works as follows.

In the initial position, the masking device 3 is pressed to the peripheral module 1, into which the central insert 2 is inserted, made in the form of a reflective screen.

When using a photo screen as a framing frame, the masking device 3 (Fig. 1) lifts and sets the moving rulers 14 (Fig. 2), providing the desired result of framing. Masking device 3

immersed in the image of the negative projected on the reflective screen 15, sharpen. A podpodn in a masking device 3, on the base 15 is placed a sheet of photographic paper, pressing two of its sides

0 to the stops 4. The masking device 3 is lowered and fixed in the working position, in which the photographic material is exposed.

When using a photo screen as an illumination device that provides, for example, viewing photo originals to the light, the reflective screen is taken along slots 6 from the peripheral module 1 and in its place

0 installation of the central insert 2, made in the view of the lighting screen. This automatically provides connectivity. electrical connector, elements of which are located on panels 8 (Fig. 1)

5 of the peripheral module 1 and the central liner 2. A photo original is placed on the surface of the upper transparent panel 18 (FIG. 4) and fixed on the photo screen using a masking device 3 (FIG.

0 1). Using a switch (not shown) located on the peripheral module 1, turn on the light source 19 (Fig. 4) and make a visual analysis of the photo original. Similarly, the work is carried out with the lighting device as a central liner of the photo screen during photo retouching of the photo original or its reproduction.

When using a photo screen as an electronic framing frame, which provides exposure during photo printing, a central insert is installed, made in the form of a photo-measuring device (Fig. 5).

5 The optical image of the photonegative is formed on the upper panel 22 of the housing of the photo-measuring device. The manipulator with the handle 25 in the working zone of movement control of the probe 23,

0 located directly in front of the front side face of the housing 21, a light probe 23 is installed in the area of the image element selected for exposure metering. Produces light measurement, on

5 on the basis of which the exposure conditions are determined. In this case, the light measurement made after installation in the measurement zone of the light probe 23 is possible both in the absence of photographic material on the photo screen and through a sheet of photographic material laid

on the housing panel 22 (i.e., simultaneously with the exposure of the photographic material).

When using a photo screen as a framing frame, combined with a stage for complex photo printing techniques, the holders of devices 10 (Fig. 3), assembled from the required number of links 29, 32 (Fig. 7, 8), using elements 12 (Fig. 1 ) secured to the handles 5. In the holes 30, 33 (Fig. 7, 8) located at the required height, an arm 36 (Fig. 3) of the fixture clamp 35 is inserted, secured in this way to the holder 10. With the shoulders 36, 37 clamp 35 with the subsequent release of their set in it a device 11. After that priotkr masking device 3 is inserted and a photo material is inserted under it, on which the photo printing process is carried out.

The application of the invention allows to create a photo screen with improved quality and productivity of photo printing and with enhanced functionality, as well as to realize the modular principle of building a photo screen. The latter makes it possible to develop a basic model of a photo screen, which, while improving with time, can be completed with new modules that implement new functions. At the same time, old modules can also be upgraded, modified, retaining their connecting parameters. Due to this, it is possible for the user to use new modules, to replace outdated modules with modernized ones, without replacing the entire set of accessories of the photo screen. This ensures a long product life cycle, the system of its development throughout the entire cycle, the stability of the presentation of the product, as well as an increased level of product unification. The application of the invention allows to achieve a unity of style and functional solution of the product and its

5 modules

The modular principle of building a photo screen is associated with the positive economic effect of the invention, which consists in reducing the types of

.0 laboratory photographic equipment, the possibility of completing the product with modules in various versions and the possibility of their alternate development by the manufacturer and consumer acquisition.

5 F o rumlula and z o b ri e

Claims (3)

1. A photo screen containing a base with stops and a masking device hinged relative to the base, which is designed so that 0 improving the quality and performance of photo printing while simultaneously expanding the functionality, the base is made of composite, containing a peripheral module and a removable central liner, the peripheral module is U-shaped with the possibility of installing a removable central liner in it in the form of a reflective screen or lighting 0 of the screen, or in the form of a photo measuring device, and the central liner and the peripheral module are provided with means of fixing them to each other. 2. The photo screen according to p. .1, tl and h and y and 5 with the fact that the peripheral module is equipped  handles mounted on two of its mutually opposite side face x. 3. The photo screen according to claim 2, of which is that the handles are provided with removable accessories of variable length.  And t 15 / / / 13 / / / tflUJ / / / // Yu jo is Vl JzXiL / J / Yu 2 Fi.Z Ftsz.4 2 M ; l,, } / g s .s x xx x / / / 2i X 28 FIG. five 26 23 T y / u /. / FIG. b 29 29 thirty 34 FIG. 7 32 ZZ B .32 / L FIG. eight