SU1363127A1 - Device for printing microimages - Google Patents

Abstract

The invention relates to optical instrument making and allows the device to expand its functionality by providing copying of phase microimages. In the device, the optical unit is made in the form of a fiber-optic faceplate 1, whose numerical fiber aperture does not exceed 0.2 rad. The luminous flux 6 from the tubular lamps 3, after passing through the fibers 4 of the faceplate 1, illuminates the block 2 consisting of a layer of the copied original and a recording diazofilm. The rasterized image of the original in block 2 exposes the recording material. The aperture and direction of the light flux 6 along this faceplate I are kept unchanged, which makes it possible to use it for copying both amplitude and phase microimages. 1 il. (L

Description

This invention relates to optical instrument making, namely microfilming.

The aim of the invention is to enhance the functionality by copying phase microimages.

The drawing shows a diagram of a device for copying. The device contains a block 1 in the form of a fiber-optic faceplate for backlighting and placing a block 2 and contacting between the copied original and recording material and a system of light sources 3 located under the fiber-optic washer 1, each fiber 4 of which is from luminous flux 5 skips - Kaef part of the luminous flux 6 with a limited 1-aperture. The limiting angle oi determining the numerical aperture of the individual fiber 4 depends on the design features of the faceplate. For the area of faceplate 1, the angle oi remains unchanged and does not depend on the location of light source 3. The entire area of the faceplate 1 shines evenly during the copying process, and the aperture and the direction of the light flux throughout the faceplate 1 remain unchanged. The luminous flux thus formed can be used to copy both the amplitude and phase microimages, since the discreteness of the luminous flux, due to the discreteness of the fibers 4 of the faceplate 1, is in the range of 3-4 µm with a period of 4-5 µm, while the faceplate 1 limiting the aperture of the outgoing light flux allows you to bring the sources of light 3 close to faceplate 1, and the rigidity of faceplate 1 allows you to use its outer surface q as a copy table, where zmeschayut amplitude or phase microfiche and vggutrennyuyu surface S ispolzovat for razmeschersh thereon masking member (not shown) allowing the guide to carry out the selective up or partial erasure of the information in the frame by placing the frame on respective portions of said masking member opaque screens. When copying amplitude microfiches, the photosensitive recording material is placed in direct contact with

original. Phase microfiches are copied through the gap or through the film substrate of the recording material. The quality of the copy with amplitudes

The power of the original is almost independent of the aperture of the outgoing light flux. The quality of copies from phase originals substantially depends on the aperture

tours illuminating the flow, so the device should use a faceplate 1 with an aperture of fibers 4, not exceeding 0.2 rad.

The device works as follows.

When copying the amplitude original (photographic microfiche) block 2 from the placed layer to the layer of the copied original and recording

0 diazofilms are placed on the outer side of the fiber-optic faceplate 1 and pressed against it over the entire area. Luminous flux 6 from the illuminator in the form of light sources from the tubular

5 lamps 3 pass through faceplate 1 and illuminate block 2. Since light passes only through fibers 4 of faceplate 1, the original is rasterized in block 2 in accordance with

0 the structure of the faceplate used 1. The rasterized image of the original in block 2 exposes the recording material, which is then separated from the original and shown.

When copying phase microfiches (for example, photothermoplastic) two options are possible. In one of them, block 2 of the original and a copy blank (diazo microfiche) is also placed on the outer surface of faceplate 1, however, the copied original and diazo type film are not layer to layer, but layer to substrate. The substrate in this case serves

5 by means of a transform-phase micro image in amplitude.

The entire unit 2 is also tightly pressed to the faceplate 1. Include a source of 3 light. The light 6 that passes through the original in block 2 exposes the recording material, and simultaneously rasterizes the image, as indicated by Bbmie. In the background areas that do not deflect light, exposure is performed in the same way as when copying an amplitude image. In the areas with phase recording, a low aperture light flux is output outside the phase element, in

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As a result, the intensity of illumination of areas of the photosensitive layer of the recording material under the elements of the phase image is reduced. With a properly selected exposure in the recording material of medium contrast (contrast ratio of about 4), exposure modulation is sufficient to obtain a phase image after displaying a contrast copy.

In the second copy variant, the original and the diazotype film in block 2 are also placed layer-to-layer, however, a pressure tungsten frame (not shown) is inserted between them. In this case, the air gap between the layers serves as a conversion medium.

When copying phase microimages, photothermoplastic microfiches with a modulation of the relief in the range of 0.8–1.5 µm and a width of image elements of 15–50 µm are used as the original. Both when copying through a dividing frame and when copying through the received spears, one can slightly change the ratio of the height of characters to the width of the formed lines, choosing the contrast of photosensitive recording materials. A decrease in the contrast of the material (at a constant aperture of the luminous flux, determined by

Editor M. Tsitkina

Compiled by S. Shigalovich

Tehred A. Kravchuk Proofreader M. Maksimishinets

Order 6359/36 Circulation 421 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, -ZH-35, Raushsk nab. 4/5

Production and printing company, Uzhgorod, st. Project, 4

27

done by the faceplate) leads to a decrease in the contrast of characters on the copy and a decrease in the ratio of the height of characters to the width of the lines forming them. With an aperture of 0.2 rad, the signs remain readable (the ratio of the sign height to the line width is at least 3-3.5) and has a density of about 0.8 B when using high-contrast photographic materials su 7. Vesicular materials have a contrast ratio of g 3-5 As a result, the aperture of the light flux of 0.2 rad is for them the ultimate with t points of view of obtaining a readable copy with sufficient contrast of signs relative to the background and permissible distortion of the proportions of the sign.

Claims (1)

Invention Formula A device for copying micro images, containing a system of light sources and an optical block with an original and a recording photosensitive material placed on it, characterized in that, in order to extend the functionality by providing copying of phase microimages, the optical block is made in the form of a fiber-optical face plate, a numerical fiber aperture which does not exceed 0,2 rad.