SU943627A1 - Raster device for viewing images - Google Patents

Description

(5) TREATMENT DEVICE FOR EXAMINATION IMAGES

one

The invention relates to optical image viewing systems, in particular, systems for viewing images reproduced on a raster screen.

A device of this type with a luminal lens-raster screen is known, on which an intermediate stereoscopic image is reproduced with a projection optical system.}

However, the use of a translucent screen degrades the quality of the reproduced image, especially since the additional collective and projection lenses that create an enlarged image on the outer screen reduce illumination.

It is also known a device comprising two lenses installed one after the other for building and projecting an image onto a reflective raster screen at an angle to the screen plane in front of which

a lens collector is installed, and a magnifying glass, the optical axis of which is also inclined relative to the common axis of the screen and the collector. To eliminate the visibility of the screen relief, a rotational motion is communicated to it, which, in combination with the use of a reflective screen, improves image quality 21., 0 However, this result is associated with the complexity of the device design due to the need for a drive mechanism.

The purpose of the invention is to improve the observation surface without complicating the design of the device. .

The goal is achieved by the fact that the team is assembled from a positive two-convex lens and a negative flat-concave lens, the flat surface of which faces the screen.

Claims (2)

In a preferred embodiment, the curvatures of the mutually adjacent surfaces of the team lenses should be different. FIG. Figure 1 shows the principal optical design of the devices; in fig. 2 — imaging using a lens array. The image of object O is built by lens 1 in the image plane rotated 180. Then, projection lens 2 reconstructs the image geometry and projects it with the help of mirror 3 through a collective assembled from a positive two-convex lens and a negative flat-concave lens 5 to the raster screen 6. As a screen 6, a lens raster with spherical lens elements having a period of 0.2 mm and made of organic glass can be used. On the working surface of the raster relief a reflective layer 8 of aluminum is applied. The optical axes of the screen 6 and the lens team and 5 are inclined to the optical axes of projection and viewing, respectively, at angles ot and p, and the angle cL is no more than 11, and the angle J can be large. The operator through a magnifying glass 7 examines the imaginary image Q, the actual optical image on the screen. The incident rays b and c after refraction on the lenses t and 5 form a point of the image D. Let this coincidence point give the top of the spherical lens of the raster screen. Then, after reflection from Iego, the rays have directions b and c. The imaginary image of the named point is point D. Thus, the point J in the image aj is enlarged in comparison with the screen a. Performing the Collective system in the form of: lnen and negative lenses reduces the angle of the beam of rays going to any image on the screen, which, in turn, reduces the angle of inclination of the extreme rays of the same beams to the optical lens viewer relief. Any microscopic irregularities on the surface, especially reflective, are better visible if the eye looks at it at an acute angle. The change in the angle of inclination of the rays falling on the screen and reflected from it provides the Elimination of the visibility of the lens-raster relief. At the same time, an increase in the brightness and illumination of the stereoscopic image over the entire working field is achieved, which is not achievable under equal conditions by known devices. The dummy tests on a screen with a working field of 120 mm confirm the high quality of image reproduction. Claims 1. An image viewing device comprising two consecutively installed Lenses for adjusting and designing an image on a reflective raster screen at an angle to the screen plane, in front of which a lens collector is installed, and a magnifying glass whose optical axis is inclined to the common axis of the screen and collective characterized in that, in order to improve the observation conditions without complicating the design of the device, the team is assembled from a positive two-convex lens and a negative planar curved lens, the flat surface of which is facing the screen. 2. The device according to claim 1, which is related to the fact that the curvature of the mutually adjacent surfaces of the collection lens is different. Sources of information taken into account in the examination 1.Patent of Germany No. 1096638, cl. 42 h 22/08, 1961. 2. US patent fP SW3683, cl. 350-120. 1977.