the figures are described together and inclusively . the same reference symbols denote identical components . the same reference symbols with different indices denote similar or functionally similar components . the invention is not restricted to the exemplary embodiments represented . further arbitrary variants can be represented in combination chiefly with the teachings of swiss patent applications ch949 / 94 - 2 ( corresponding to wo 9527226 , us 5 , 867 , 309 , and us 6 , 069 , 733 ), ch1525 / 94 - 0 ( corresponding to wo 9527226 , us 5 , 867 , 309 , and us 6 , 069 , 733 ), ch1295 / 94 - 8 ( corresponding to wo 9527226 , us 5 , 867 , 309 , and us 6 , 069 , 733 ), ch1088 / 94 - 3 ( corresponding to wo 9527917 , wo 9527918 , us 5 , 841 , 149 , us 5 , 953 , 114 , and us 6 , 043 , 890 ), ch1089 / 94 - 5 ( corresponding to wo 9527917 , wo 9527918 , us 5 , 841 , 149 , us 5 , 953 , 114 , and us 6 , 043 , 890 ), ch1090 / 94 - 1 ( corresponding to wo 9527917 , wo 9527918 , us 5 , 841 , 149 , us 5 , 953 , 114 , and us 6 , 043 , 890 ), ch1091 / 94 - 3 ( corresponding to wo 9527917 , wo 9527918 , us 5 , 841 , 149 , us 5 , 953 , 114 , and us 6 , 043 , 890 ), ch1092 / 94 - 5 ( corresponding to wo 9527917 , wo 9527918 , us 5 , 841 , 149 , us 5 , 953 , 114 , and us 6 , 043 , 890 ), chiefly also ch3932 / 94 - 0 ( corresponding to wo 9620421 ). for the purpose of combining their teachings , all these applications fall under the disclosed content of this application . the attached list of reference symbols is consequently continued here . one the principles of the invention is illustrated in fig1 : a beam path 1 having a magnifying optical system 33 , of which only two lenses , specifically a main objective 8 and an eyepiece 18 , are represented symbolically , has an obliquely positioned beam splitter 32 a by means of which both the image information is directed to the eyepiece 18 through the main objective 8 , and image information reflected in from the side is directed to the eyepiece 18 . the beam splitter can be a semireflecting mirror or the like . it can also possibly be constructed in a miniaturized fashion as a small mirror which is bonded on a glass plate perpendicular to the optical axis 7 , as is represented in swiss patent application ch1092 / 94 - 5 ( our ref . : r - p - 3175 - ch ), such a latter design always functioning with divergence of the beams 101 , which , if appropriate , requires additional computational outlay for the beam deflection . according to the invention , the image information reflected in from the side comprises an image of a thin , focused light beam 101 , in particular a laser beam , which follows the lines to be represented pictorially in a repeated fashion at the required speed , thus rendering a coherent image , for example lines , numbers , letters , symbols , areas etc ., visible to an observer . these are scattered on diffusing screen 108 a and are distinguished there by a good brightness ( virtually unlimited , depending on the laser power ) and thus by a distinct contrast with respect to the image seen through the main objective 8 . the image of the scattered laser beam is projected onto an intermediate image plane 103 of the tube by means of a lens 31 via the beam - splitting mirror 32 a . the beam is deflected or moved by a deflecting device 102 , known per se which has mirrors or the like which can move under control , and in this way can deflect a beam 101 irradiated into it . it goes without saying that a plurality of beams with , if appropriate , a plurality of deflecting devices as well , could also be provided simultaneously . it is also conceivable , if required , for a plurality of laser beams to be run together on the diffusing surface , in order to increase the energy density and thus the brightness . the movement of the beam 101 is represented symbolically by a dashed arrow of rotation . the beam 101 is obtained from a light source 64 , in particular from a laser , which could , of course , also be integrated into the deflecting device . also represented in the exemplary embodiment shown is a light valve 107 which makes the brightness of the beam 101 controllable . the deflecting device 102 , light valve 107 and light source 64 can preferably be controlled arbitrarily from outside , in order for the image to be represented by the beam 101 to be configured optimally in terms of beam quality for the observer , whose eye 100 is represented . in the exemplary embodiments in accordance with fig1 and fig3 the beam 101 is deflected in such a way that , via the eyepiece 18 , it projects the image it produces directly into the observer &# 39 ; s eye 100 or onto the retina thereof . the light source 64 used can thus be relatively weak optically . in the region of an intermediate image plane 103 of the optical system 33 , the beams 101 are thus preferably parallel to the optical axis 7 of the optical system 33 . however , it is not essential for the beam 101 to be faded in at the point shown . a variant is also conceivable in which the beam is directed into the observer &# 39 ; s eye 100 only after the eyepiece 18 . this variant is expedient particularly in combination with the teaching of swiss patent application ch1092 / 94 - 5 ( our ref . : r - p - 3175 - ch ), since it does not unnecessarily increase the required distance of the eye from the eyepiece . the object observed is represented symbolically with 22 , the purpose of this design being , for example , to draw a high - contrast , bright line around an object detail 22 a . the scope of the invention therefore also covers that variant in which the beam 101 is projected not directly into the observer &# 39 ; s eye 100 , but directly onto the object 22 , the beam splitter 32 a then having , of course , to act inversely . the beam can be used to represent , for example , patient information data such as blood pressure , heart rate etc . in graphic form , as indicated in fig2 . by contrast with the first variant , a laser beam 101 is directed there straight into the eye , as indicated symbolically . the optician knows the measures required to project the beam 101 correctly straight onto the retina . a diffusing screen can thereby be eliminated , and the beam can apply a high brightness and level of contrast with the correspondingly lower amount of energy . the image prescribed by the deflecting device 102 a is thus produced directly on the retina and is superimposed precisely there on the image seen through the main objective 8 . in this design , it is immaterial which angle the beams make with the optical axis 7 , to the extent that they impinge only at the desired site on the retina . as an alternative to this design , it would be possible to use in the intermediate image plane 103 a diffusing grating at which only the wavelength region of the laser light is scattered , while the other light wavelength regions pass unimpeded , with the result that despite the diffusing screen there is no appreciable darkening of the image seen below the main objective 8 . in the example represented , blood pressure and heart rate are represented in the area of the object detail 22 a which is seen . this patient information is obtained by known measuring instruments and , if appropriate , conditioned via a data conditioning unit 89 ( compare swiss patent application ch 1091 / 94 - 3 ( our ref . : r - p - 3174 - ch )) in such a way that suitable control data can be fed to the deflecting device 102 a in order to permit quick real - time operation . the example represented in fig3 concerns an image - processing ( video ) evaluation of an image seen through the main objective , for example object detail 22 a through an image processing device 104 a which is coupled to an image recording device 9 a ( for example ccd ). the image recording device 9 a is coupled to the beam path 1 via an imaging optical system and via a beam splitter 32 b , with the result that the image processing device 104 a recognizes the object detail 22 a being observed . represented by dashes are the image recording device 9 b and image processing device 104 b , which can be provided in addition to or as an alternative to 9 a and 104 a . in the variant drawn with full lines ( 9 a , 104 a ), in addition to the image of the object detail 22 a , the image processing device 104 a also has available the image from the deflecting device 102 b which is projected inversely by the device 104 a . subsequent correction is therefore easily possible . the present example is concerned with detecting contours on the object detail 22 a and enhancing them by means of beam superimposition ( 101 ). this makes it easier for an operating surgeon , for example , to make out the areas involved more quickly and more clearly . the beam splitter 32 a is arranged in this example approximately centrally about an intermediate image plane 103 , and is itself provided with a surface 108 b which scatters to a slight extent , with the result that an additional diffusing screen is eliminated . in the exemplary stereomicroscope in accordance with fig4 diffusing screens 108 a are again provided , on which partial images offset by the parallax are represented per beam path 1 a , 1 b relative to the respective optical axis 7 a , b ; said partial images are combined in the observer &# 39 ; s brain to form a 3 - d image . the deflecting devices 102 c , d are driven for this purpose by an image recognition device 105 , possibly with an image processing device 104 , which receives its image information — possibly via a data conditioning unit ( 89 ) ( not represented ) and / or via an image memory — from a 3 - d image data recording unit or diagnostic data device 106 . the latter preferably operate not in the visible wavelength region as do the microscope beam paths , but by means of x - rays , alternating magnetic fields , positron beams , ultrasound or the like . thus , for example , it is possible using this design to superimpose three - dimensional grid lines calculated from the abovementioned patient data on an object detail 22 a which is seen three - dimensionally or is to be seen theoretically , with the result that an operating surgeon again obtains an area of interest to him in a clear and bright fashion and highlighted with thin lines . of course , arbitrary combinations of superimposed images are also contained within the scope of the invention , such as alphanumeric data , contour enhancement and encirclements of areas . the variant in accordance with fig5 operates with a micromirror deflecting unit having a drive in the tube 33 , which directs a laser beam 101 in the correct position against the observer &# 39 ; s eye 100 . not shown in more detail , but familiar to the person skilled in the art as being within the scope of the invention are variants with colored lasers or with electron beams which cause suitable fluorescent screens or the like to light up with patterns . such designs also comprise , if appropriate , vector display screens , where lines are frequently retraced in each case by the beam . the invention also covers variants in which instead of being fed directly to the eye the light beams are firstly led to the object being observed and scattered thereon . this list of reference symbols also contains reference symbols of figures which are contained in the above - mentioned applications since , as mentioned , these count as also having been disclosed for combination purposes within the framework of this invention . this applies , in particular , to the microscopes with special beam paths and beam splitters , and to the devices for measuring the magnification and the distance from the microscope to the object as well as to microscopes for stereotactic operations etc . 2 a , b second beam path ( first beam paths laid geometrically one above another ) 3 a , 3 b , 3 c opaque and preferably silvered stop 4 c beam splitter for cutting out the measuring beam 41 backing plate a , b , c : prismatic with integrated mirror 53 b between cam disk 52 and magnification - d [ sic ] display 51 b 85 position - measuring system for determining the absolute position of the microscope in space , and also for the purpose of being able to reach a conclusion upon the position of the visual field at the object from knowledge of the object / microscope distance 88 command control element for controlling the movement of the microscope ( for example foot switch ) 94 second device ( for example mri unit or ct unit ) b ′ spacing of the measuring beams 57 a and 57 b at the measuring array
a microscope is disclosed for observing a magnified area . fade - in means arranged in the path of the rays of the microscope reflect a thin focused beam of light into the path of rays . the beam of light is deflected or modulated by deflecting means to supply an image that can be recognised by an observer . the image may be projected onto the object either directly or indirectly , for example through a diffusing screen .