DD288468A5

DD288468A5 - PRISM SYSTEM FOR IMAGE REPRODUCTION AND BEAM DISTRIBUTION

Info

Publication number: DD288468A5
Application number: DD33362889A
Authority: DD
Inventors: Uwe Schaller
Original assignee: Veb Carl Zeiss Jena,De
Priority date: 1989-10-16
Filing date: 1989-10-16
Publication date: 1991-03-28

Abstract

Die Erfindung betrifft ein Prismensystem zur Bildumkehr und Strahlvereinigung. Es ist besonders geeignet fuer den Einsatz in optisch abbildenden Systemen in deren Bildebene Zusatzdaten eingebracht werden sollen. Es entspricht in der Anordnung seiner optisch wirksamen Auszenflaechen einem Porosystem 2. Art und wirkt entsprechend fuer einen das Porosystem in ueblicher Art durchdringenden Abbildungsstrahlengang. Intern befindet sich eine in unueblicher Lage angeordnete teilverspiegelte Schicht. UEber diese wird ein zweites Strahlenbuendel in den Abbildungsstrahlengang eingekoppelt. Fig. 1{Prismensystem; Bildumkehr; Strahlvereinigung; System, abbildend; Zusatzdaten; Porosystem; Abbildungsstrahlengang; Schichtteilverspiegelt}The invention relates to a prism system for image reversal and beam combination. It is particularly suitable for use in optical imaging systems in the image level additional data should be introduced. It corresponds in the arrangement of its optically effective Auszenflaechen a Porosystem 2nd kind and acts accordingly for a the Porosystem in the usual way penetrating imaging beam path. Internally there is a semi-mirrored layer arranged in an unimpressive position. Via this a second beam is coupled into the imaging beam path. Fig. 1 {prism system; Image inversion; Beam combiner; System, mapping; Additional data; Porosystem; Imaging path; Schichtteilverspiegelt}

Description

Das Wesen der Erfindung liegt in der speziellen Anordnung einer teilversplegelten Schicht in einem an sich bekannten Porosystem 2. Art. Dadurch ist es möglich, einen zweiten Strahlengang in das das Prismensystem in üblicher Weise durchdringende Abbildungsstrahlenbündel einzukoppeln. Die optische Achse des einzukoppelnden Strahlenbündele steht senkrecht auf seiner Eintrittsfläche und hat bis zur teilverspiegelnden Fläche den gleichen Glasweg wie das Abbildungsstrahlenbündel. Mit dem erfindungsgemäßen Prismensystem ist es möglich, bei Beibehaltung der Größe und Masse des als Umkehrsystem dimensionierten Porosystems 2. Art neben der üblichen Höhen- und Seitenumkehr die Einkopplung eines zweiten Strahlengangs in den das Prismensystem in üblicherweise durchdringenden Abbildungsstrahlengang zu realisieren.The essence of the invention lies in the special arrangement of a teilversplegelten layer in a known per se Porosystem 2. Art. This makes it possible to couple a second beam path in the prismatic system in the usual way penetrating imaging beam. The optical axis of the bundle of rays to be coupled is perpendicular to its entrance surface and has the same glass path as the imaging beam to the partially mirrored surface. With the prism system according to the invention, it is possible to realize the coupling of a second beam path into the prism system in the usually penetrating imaging beam path, while maintaining the size and mass of the porosystem of the second type, which is dimensioned as a reversal system.

AusfOh'rungsbelsplel The invention will be explained in more detail below using an exemplary embodiment. In addition shows

Fig. 1: eine theoretische Ausführung des erfindungsgemäßen Prismensystems und Fig. 2: eine optimierte Ausführung.Fig. 1: a theoretical embodiment of the prism system according to the invention and Fig. 2: an optimized design.

Die in Fig. 1 dargestellte theoretische Ausführung des erfindungsgemäßen Prismensystems umfaßt drei Einzelprismen, wovon das erste und zweite Prisma 1,2 jeweils einem Halbwürfelprisma mit einem an einer Kathetenfläche angesetztem Keil (Keilwinkel 22,6°) entsprechen und das dritte Prisma 3 ein 90°-Pr!sma darstellt, dessen zweigeteilte Hypothenusenfläche einen Winkel von 135° einschließt. Diese drei Prismen sind so miteinander verbunden, daß das Prismensystem in der Anordnung seiner Außenflächen einem an sich bekannten Porosystem 2. Art entspricht. Die im Prismensystem innen liegenden Verbindungsflächen zwischen dem ersten und dritten, so wie dritten und zweiten Prisma hingegen, sind gegenüber der optischen Acltse, eines in bekannter Weise das Prismasystem durchsetzenden Strahlenbündels, unüblich um 67,5° geneigt. Die Verbindungsflächen zwischen dem dritten und zweiten Prisma 3,2 stellt eine teilverspiegelte Schicht 4 dar. Entsprechend kann ein erstes Strahlenbündel, daß in üblicher Weise das Prismensystem durchdringt und eine Höhen- und Seitenumkehr erfährt diese teilverspiegelte Schicht 4 teilweise passieren. Ein zweites Strahlenbündel das senkrecht durch die der teilverspiegelten Schicht 4 gegenüberliegenden Außenfläche in das Prismensystem eintritt, wird an der teilverspiegelten Schicht 4 teilweise so reflektiert, daß es die gleiche Richtung wie das erste Strahlenbündel aufweist und das Prismensystem durch dessen Austrittsfläche verläßt. Beide Strahlenbündel haben den gleichen optischen Weg und durchlaufen das Prismensystem dispersionsfrei.The illustrated in Fig. 1 theoretical embodiment of the prism system according to the invention comprises three individual prisms, of which the first and second prism 1.2 each correspond to a half-cube prism with an attached to a catheter surface wedge (wedge angle 22.6 °) and the third prism 3 a 90 ° -Pr! Sma, whose bipartite hypotenuse area encloses an angle of 135 °. These three prisms are connected to each other so that the prism system in the arrangement of its outer surfaces corresponds to a known Porosystem 2nd kind. The connecting surfaces between the first and third, as well as the third and second prisms, which are located inside the prism system, are inclined at an unusual distance of 67.5 ° with respect to the optical axis, a beam passing through the prism system in a known manner. The connecting surfaces between the third and second prism 3.2 represents a partially mirrored layer 4. Accordingly, a first beam that penetrates the prism system in the usual way and experiences a height and side reversal undergoes this partially mirrored layer 4 partially. A second beam that enters the prism system perpendicularly through the outer surface opposite the partially-mirrored layer 4 is partially reflected at the partially-mirrored layer 4 so as to have the same direction as the first beam and exit the prism system through the exit surface thereof. Both beams have the same optical path and undergo the prism system without dispersion.

Die in Fig. 1 dargestellte theoretische Ausführung des erfindungsgemäßen Prismensystems läßt sich durch Beschneidung des ersten und zweiten Prismas optimieren. Ein solch optimiertes Prismensystem ist in Fig. 2 dargestellt. Durch die geringe Anzahl von Außenflächen des ersten und zweiten Prismas ist es technologisch schneller herstellbar, ohne Beschneidung des Strahlenbündels ist es kleiner und leichter.The illustrated in Fig. 1 theoretical embodiment of the prism system according to the invention can be optimized by trimming the first and second prism. Such an optimized prism system is shown in FIG. Due to the small number of outer surfaces of the first and second prism, it is technologically faster to produce, without circumcision of the beam, it is smaller and lighter.

Claims

Prism system for image reversal and beam combination in which the outer surfaces of the existing of three individual prisms prism system corresponding to those of a Porosystems

2. Art are arranged, characterized in that one of the connecting surfaces between the individual prisms with respect to the optical axis of a passing beam is inclined by 67.5 ° and partially mirrored, so that a beam which the prism system in eiaer for a Porosystem The usual way of interspersing this surface partially penetrates, while a second beam which is perpendicular to the outer surface opposite the partially mirrored surface, is partially reflected at this surface so that the optical axes of the passing and reflected beam have the same direction.

For this 2 pages drawings

Field of application of the invention

The invention relates to a prism system for image reversal and beam combination. It can be advantageously used in optical imaging devices such as rangefinders and telescopes, where an overlay of images or the introduction of additional data is required.

Characteristic of the known state of the art

From the prior art, an extremely large number of beam splitting and -vereinenden and beam deflecting prism systems is known. Usually, the task of beam deflection and the union of two beams is realized with different modules. So z. B. the porosystem 2nd kind a prism group, which finds especially rangefinders, binoculars and telescopes for height and side reversal of the imaging beam path application. To reflect a second beam path in the imaging beam path, z. For example, for generating double images or imaging of additional data, a divider cube or a partially transmissive mirror is generally used. Prism systems that realize both beam combining and image reversal are known. Depending on their intended use, they differ in the type, number and arrangement of the optically active surfaces and are therefore usually only very specifically applicable.

Such a special prism system is disclosed in DE-PS 944223. Light bundles emanating from two images are superimposed by means of an internal, partially mirrored surface and then divided in order to be able to view the overlaid images biocularly. This prism system is an optimal solution for its very specific application. In DE-PS 800438 A prism set is described, which connects a porosystem 1st type and a porosystem 2nd type to each other so that with the Tollverspiegelung an internal already existing area Beam splitting is possible and both partial beam paths undergo a change in altitude and side. A known laser rangefinder of Soviet origin uses a conventional porosystem 2 for beam splitting and image reversal. The last reflection surface of which has a selective layer and to which a half-cube prism is attached. The latter two prism systems both realize the height and side reversal for the imaging beam path. However, they are not changeable to use instead of beam splitting to the beam union.

Object of the invention

The aim of the invention is to provide a small lightweight optical assembly that realizes the height and side reversal of an imaging beam path and via which a second beam path can be coupled into the imaging beam path.

Explanation of the essence of the invention

The invention is based on the object ₍ to modify a height and side reversing prism system by introducing a partially mirrored layer.

According to the invention, this object is achieved with a prism system for image inversion and beam combination in which the outer surfaces of the prism consisting of three prisms are arranged according to those of a porosystem 2.Art, achieved in that one of the connecting surfaces between the individual prisms with respect to the optical axis of a passing beam is arranged inclined by 67.5 ° and is partially mirrored, so that a beam passing through the prism system in a manner usual for a Porosystem 2 way, this surface partially penetrates, while a second beam, which is perpendicular to that of the partially mirrored surface opposite Outside surface is partially reflected at this surface so that the optical axes of the passed through and reflected beam have the same direction.