DD286435A5 - COAXIAL LIGHTING SYSTEM FOR STEREOMIC ROSCOPES - Google Patents

Abstract

The invention relates to a coaxial illumination system for stereomicroscopes. A strictly coaxial illumination for both stereoscopic beams is realized by providing a coaxial illumination system for stereomicroscopes, especially surgical microscopes, with a stereo base width B and lens intercept S, where the illuminating light is over inclined split beams and a light trap is provided for false light, two partial beam splitter mirrors are provided, which are inclined against each other by the angle arctg * and the dividing line of the mirror between the stereoscopic observation beam expands and the center axes of the observation beam are perpendicular to the axis of inclination of the mirror pair. Fig. 1 {coaxial illumination system; Stereo microscope; Surgical microscope; Beamsplitter mirror; Observation beam path; Pair of mirrors; Light trap; Illumination light}

Description

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Fig. 1: Arrangement of the additional lighting in the beam path

Fig. 2: Arrangement of the additional lighting with folding mechanism

1 is a housing of a stereoscopic surgical microscope. Figure 2 illustrates the front lens of the surgical microscope and 3,3 'marks the projection of the entrance pupil of both stereoscopic beam paths in the objective plane. 4,4 'are the center rays of the two stereoscopic light paths; they are inclined at a width of the stereo base 7 of, for example, 22mm and at a lens cutting width of 200mm by 3.1 degrees to the lens axis 5. 6 and 6 'is a pair of semitransparent mirrors inclined at 45 degrees about an axis parallel to the stereo base, the mirrors 6, 6' according to the invention being tilted against each other such that the central beams 4, 4 'are perpendicular to the axis of inclination of the mirrors stand. The center beams 4,4 'pierce the pair of mirrors at 8 and 8', respectively. 9 is the housing for an illumination system, preferably consisting of 8US a Lichtleitbündel 10 and an imaging lens 11, which images the light exit surface of the fiber bundle on the partially transmissive pair of mirrors 6,6 'in the object 12. 13 is the housing of a light trap, which is provided with highly absorbent pad 14 and suppresses the reflection of the passing through the partially transmitting mirror illumination light. 15 is a pull magnet with an armature 16, which can pivot out about the mirror 6,6 'about an axis 18 from the beam path via a lever 17.

The coating of the partially transmissive mirrors is spectrally selective and suppresses in particular light with wavelengths below 430 nm in order to protect the retina of the eye from damage.

In another embodiment of the additional illumination according to the invention two parallel illumination systems are used. This has the advantage of a possible flat design. The function of the coaxial illumination system according to the invention results from the strict coaxial test, which is equally guaranteed for both stereo beam paths.

Claims (3)

1. Coaxial illumination system for stereoscopic microscopes, especially surgical microscopes, with a stereo base width B and lens section width S, the illumination light is made on inclined partially transmitting beam splitter mirror and a light trap is provided for false light, characterized in that two partially transparent beam splitter mirror are provided, which arctg against each other from the angle (S / B) are inclined and the dividing line of the mirror between the stereoscopic observation beam paths and the center axes of the observation beam paths are perpendicular to the tilt axis of the mirror pair. 2. Coaxial illumination system according to claim 1, characterized in that a device for pivoting out of the mirror pair is provided. 3. Coaxial illumination system according to claim 1, characterized in that the partially transmissive mirror are designed to be spectrally selective for the suppression of the physiologically harmful entertaining portion. For this 1 page drawings Field of application of the invention The invention finds application in the context of surgical microscopes, especially in ophthalmological operations. Characteristic of the known state of the art It is already known (DE3623613) to realize a nearly coaxial illumination via a fixed splitter mirror arranged in the observation beam path. This lighting system is not strictly coaxial with each other in a realization as additional unit that can be mounted in front of the lens due to the inclination of the two stereoscopic beam paths and therefore produces unequal distributions of the so-called "regredient" light for both beam paths This reduction is only acceptable and necessary for limited periods of use and interferes with fixed installation of the auxiliary lighting The solution proposed in G 02 B / 3281885 does not result in loss of brightness, but only approximates the coaxial illumination and does not allow illumination with parallel light, which is often desirable. Object of the invention The aim of the invention is to eliminate the disadvantages of the previous solutions and to limit the brightness reduction in time. Explanation of the essence of the invention The object of the invention is an equally coaxial for both stereoscopic beam paths illumination, which is temporarily switched on in the beam path and which is to be attached in the form of an auxiliary unit on the surgical microscope. The object is achieved in a coaxial illumination system for stereomicroscopes, in particular surgical microscopes, with a stereo base width B and lens section width S, the illumination light via inclined partial transmitting beam splitter mirror and a light trap is provided for Felschlicht, according to the invention solved in that two partially transparent beam splitter mirror are provided, which against each other are inclined by the angle arctg (S / B) and the dividing line of the mirrors extends between the stereoscopic observation beam paths and the center axes of the observation beam paths are perpendicular to the inclination axis of the mirror pair. It is advantageous if a device for the Hereusschwenken of the pair of mirrors is provided and the partially transparent mirror suppression of the physiologically harmful short-wave component are formed spectrally selective. embodiment The function of an additional illumination system according to the invention for surgical microscopes will be described with reference to schematic representations.