SU1534422A1 - Optical projection system for copying device - Google Patents

Abstract

The invention relates to optical instrumentation and allows the operational capabilities of projection optical systems for copiers to be expanded. The projection system comprises a reflector 1 in the form of the hollow ellipsoid of rotation of a transparent material provided on its outer and inner surfaces respectively diffusely-reflecting and beam-splitting coatings. The first focus F ₁ of the ellipsoid of rotation disposed powerful light source 2, at the second focus F ₂ - the center of the entrance pupil of the projection lens 3. The arc lamps 4 are located around the perimeter of the reflector 1 and are fixed diaphragm 5 with a central hole. During viewing of the image, the radiation from the source 2 is reflected from the beam-splitting coating of the reflector 1, the negative placed in the negative holder passes, the projection lens 3 and enters the screen 7. During the exposure of the photographic material, the source 2 is brought out of the section of the light beam and The beam splitting coating is reflected from the diffuse coating, after which part of the scattered radiation in the return stroke hits the negative, illuminating it, then the image is formed by lens 3 on the photographic material. 2 hp f-ly, 2 ill.

Description

1

315

the 2 is reflected from the sieve of the divider coating of the reflector 1, the megtio placed in the backing holder passes the projection lens 3 and enters the screen 7. During the exposure of the photographic material, the source 2 is outputted beyond the section of the light beam, and the radiation from the lamps k

the beam splitting coating passes and is reflected from the diffuse coating, after which part of the scattered radiation in the return stroke hits the negative, illuminating it, then the image is formed by lens 3 on the photographic material. 2 hp f-ly, 2 ill.

The invention relates to an optical instrument making, namely, an apparatus for converting an image during photo printing.

The aim of the invention is the expansion of operational capabilities.

FIG. 1 is a schematic diagram of a projection optical system for a copier; in fig. 2 - reflector section element.

A projection optical system for a copier contains a reflector 1 as part of a hollow ellipsoid of rotation, in the first focus G, which is a powerful quartz halogen lamp 2

incandescent beyond the limits of the optical path in the process of exposure of the Photomaterial, and in the second focus of the FJL is the center of the entrance pupil of the projection lens 3. Sixteen high-pressure mercury arc lamps 4 are directed along the reflector 1 perimeter. 3, is fitted with a diaphragm 5 with a central opening for forming a beam section of the light flux.

 the object space of object 3 between the lamp 2 and the object itself is a negative holder 6, and about the spatial image - the screen

7, on which is placed the exhibited photographic material or auxiliary materials containing reference points and contour lines.

The ellipsoid of rotation 1 is made transparent in the form of a glass shell.

8, on the outer (convex) surface of which a coating in the form of a layer is applied

This white barium paint diffusely scatters the radiation incident on it, and an optical light is applied to the inner (concave) light.

five

0

five

0

five

0

five

0

a separating coating 10 with a reflection coefficient of at least 102 and a coefficient of light transmission of at least 85.

When using a sufficiently powerful lamp 2, instead of a transparent glass shell 8, an opaque shell (substrate) can be applied, on the inner (concave) surface of which, instead of the beam-splitting coating, diffuse reflective enamel is applied with a glossy surface that is specularly reflected by the refractive index difference enamel and air about 5% of the radiation incident on it.

During viewing of the image by the operator, the system works as follows.

The radiation from the lamp 2 is reflected from the beam-splitting coating 10 of the reflector 1, passes through the negative installed in the negative holder 6, collects in the entrance pupil of the lens 3 and after leaving the latter forms an image of the negative on the screen 7 or installed on the last auxiliary materials.

In the process of exposing a photographic material, the system, beyond the limits of the optical current of which lamp 2 is derived, operates as follows.

The radiation from the lamps C passes through the beam-splitting coating 10, the glass cladding 8 of the reflector 1 and is scattered on layer 9. Part of the scattered radiation passing through the glass cladding 8, the beam splitting coating 10, the negative installed in the negative holder 6, enters the entrance pupil of the lens 3 and after leaving the latter forms a negative image on the photographic material installed on the screen 7.

In the process of adjusting the projection system to another magnification other than the nominal one, the following operations are performed. The lamp 2, the lens 3 and the screen 7 are moved along the optical axis of the system — a straight line passing through the foci F, and Fz (FIG. 1) of the reflector 1, so that the filament body of the lamp 2 is optically coupled to the exit pupil of the lens 3 and the negative, mounted in the negative-bearing body 6, is optically coupled to the photo- material mounted on the screen 7. In this case, the lamp 2 and the lens 3 are displaced relative to the reflector 1 foci.

Claims (3)

1. A projection optical system for a copier containing a diffusely coated reflector, light sources placed around the perimeter of the reflector, and a diaphragm with a central hole installed on the optical axis in series with a central hole to form a section of the light beam, a negative holder and a projection lens with an entrance pupil, distinguished Compiler S. Shigalooich Editor V. Petrash Tehred Jf. Serdyukova Order 40 Circulation 372 VNIIPI Go of the Committee on Inventions and Discoveries under the State Committee on Science and Technology of the USSR 1P035, Moscow, Zh-35, 4/5 Raushsk nab. so that, in order to expand its operational capabilities, it is provided with an additional light source mounted on the optical axis between the reflector and the negative holder with the possibility of outputting beyond the limits of the light beam section, and the beam-splitting element as a part of a hollow ellipsoid of rotation made of a transparent material with a beam-splitting coated, with an additional light source placed in the first focus of the hollow ellipsoid of rotation, and near its second focus is the entrance pupil of the projection lens. 2. A pop-up system 1, which differs from the fact that the coefficient of light transmission of the beam-splitting element exceeds its reflection coefficient. 3. Pop. 1 system, which differs in that the positive coating is made on the inner surface of a part of the hollow ellipsoid of rotation, and on its outer surface - a diffuse reflecting coating. S 9 10 1 Proofreader E. Lonchakoya Subscription