JP2005070809A - Stereoscopic microscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stereoscopic microscope of which the size from the top to the bottom of a microscope main body is reduced, and which facilitates observation with naked eye from the vicinity of the eyepiece section toward the bottom direction and eliminates a conventional failure regarding an assistance microscope. <P>SOLUTION: In the stereoscopic microscope, an objective optical system 21 is arranged in a longitudinal direction state and a zoom optical system 22 is arranged in a lateral direction state and is divided into two groups arranged parallel to each other so that they are in the same level in a longitudinal direction. The luminous flux passed the zoom optical system 22 is passed through the top side of the zoom optical system 22 and folded back to an eyepiece optical system 23 side. The lens L2 of the objective optical system 21 whose edge is cut causes a luminous flux K1 to passes the position where the radius of the lens L2 is made small. An assistant microscope 7 to which an objective optical system 15, a zoom optical system 16 and an eyepiece optical system 18 are independently provided with respect to the microscope main body 2, are mounted onto a taking-in port 3 of the microscope main body 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a stereoscopic microscope that allows a doctor and an assistant to grasp an observation object in three dimensions.

  A surgical microscope used in brain surgery or the like is a three-dimensional (substance) microscope that can grasp an affected part three-dimensionally. Then, the light beam reflected from the affected part is introduced into the inside of the entrance formed in the lower part of the microscope main body, and guided to the two pupils of the doctor through the objective optical system, the zoom optical system, and the eyepiece optical system. It has become. In such a stereoscopic microscope, in particular, when both the objective optical system and the zoom optical system provided inside the microscope main body are arranged in the vertical direction (the “vertical direction” when the affected area is down), the vertical dimension of the microscope main body is reduced. The distance from the eyepiece provided in the upper part to the entrance of the light beam provided in the lower part increases. As a result, as a result, the distance from the eyepiece to the affected area located below the intake port becomes longer, and the doctor with the eye on the eyepiece must work with the arm extended. This is not preferable in terms of workability.

  For this reason, there has been proposed a system in which both the objective optical system and the zoom optical system are arranged in the horizontal direction (the “lateral direction” when the affected area is down) to reduce the vertical dimension of the microscope body. In this conventional example, the zoom optical system and the objective optical system are one system, and both use large-diameter lenses. In addition, since the objective optical system is also oriented in the horizontal direction, an optical element that reflects the light beam at a right angle is provided at the inlet in order to incorporate the vertical light beam reflected from the affected part into the objective optical system.

In addition, in such a stereoscopic microscope, there is a case where an assistant microscope is integrated with an assistant microscope for assisting the operation to see the affected part, or for education for studying the operation method while observing the contents of the operation. is there. In order to obtain the same observation image as the microscope main body, this type of assistant microscope shares the objective optical system and zoom optical system of the microscope main body, and is assembled integrally with the microscope main body in advance (for example, , See Patent Document 1).
JP-A-6-138394

  However, in such a conventional stereoscopic microscope, the zoom optical system is “one system” that allows two light beams to pass through both end portions of a single large-diameter lens. The lens diameter of the continuous objective optical system becomes very large. In particular, since the lens of the objective optical system is located in the vicinity of the intake opening formed in the lower part of the microscope main body, when the diameter of the lens of the objective optical system is increased, the aperture size of the intake is also increased. As the aperture size increases, the width of the lower part of the microscope body in the horizontal direction increases, and the doctor shifts his eyes from the eyepiece provided on the upper part of the microscope body and observes the affected part located below the microscope body with the naked eye. It becomes difficult to work. In other words, the doctor not only magnifies the affected area through the eyepiece, but also sometimes observes the affected area directly with the naked eye while slightly shifting the eye from the eyepiece. If it is wide, it becomes difficult to observe the affected area below.

  In addition, since the objective optical system is oriented in the horizontal direction, an optical element that reflects the light beam at a right angle is interposed at the inlet in order to take the vertical light flux reflected from the affected part into the objective optical system from the inlet. There is a need. Accordingly, the optical path from the observation target to the objective optical system becomes longer as the optical axis is bent in this way, and it is necessary to increase the opening size of the intake port in order to observe a wide range at a low magnification. Therefore, the same problem as described above occurs. Since the optical element for bending the optical axis is provided in the vicinity of the intake, the number of parts is increased, and the structure in the vicinity of the intake of the microscope main body is complicated.

  In addition, since the assistant microscope is mounted integrally with the microscope main body, it cannot be easily removed when it is not necessary. Moreover, since the assistant microscope and the microscope main body share the optical system, the magnification of the assistant microscope cannot be changed independently from the microscope main body. Therefore, it is difficult to perform a combination operation by two doctors, such as a main doctor operating a deep lesion and an assistant doctor processing a shallow part.

  The present invention has been made paying attention to such a conventional technique, and facilitates the naked eye observation from the vicinity of the eyepiece portion while reducing the vertical dimension of the microscope main body, and the assistant. It is an object of the present invention to provide a stereoscopic microscope that can eliminate the conventional problems associated with a microscope.

  The invention according to claim 1 includes a microscope main body in which a light beam from an observation target sequentially passes through an objective optical system, a zoom optical system, and an eyepiece optical system, and the objective optical system is oriented vertically with respect to the light beam from the observation target. On the other hand, the eyepiece optical system is positioned substantially above the objective optical system, and the zoom optical system is disposed in a parallel state divided into two systems in the horizontal direction and at the same level in the vertical direction. The illumination optical system that irradiates the observation object from an oblique direction near the entrance of the light flux from the observation target through the upper side of the zoom optical system and folded back to the eyepiece optical system side. The lens constituting the objective optical system has a shape in which the end portion on the illumination optical system side is cut, and the objective optical system lens in which the end portion is cut is in a position where the diameter of the lens can be reduced. , The light flux from the observation target In this stereoscopic microscope, a detachable assistant microscope is attached from the observation object side to the entrance of the light beam from the observation object in the microscope body, and the assistant microscope is an objective optical system different from the microscope body, zoom optics System and eyepiece optical system independently.

  According to the second aspect of the present invention, the assistant microscope receives a branched light beam from one light branching means arranged on the same axis as the light beam at the entrance of the microscope body, and is a lateral objective optical that is at the same level in the vertical direction as the light branching means. The zoom optical system is arranged in a tilted direction away from the observation target with respect to the objective optical system.

  According to a third aspect of the present invention, the assistant microscope takes in a branched light beam from one optical branching means arranged on the same axis of the light beam at the entrance of the microscope body, and moves the optical axis of the taken branched light beam away from the observation target. Bent into a crank shape.

  According to a fourth aspect of the present invention, the assistant microscope takes in the light beam from one angle-reflecting light reflecting means arranged at a position different from the optical axis of the light beam at the entrance of the microscope body, and the optical axis of the incorporated light beam is the object to be observed. It is bent in a crank shape in a direction away from the center.

  According to the fifth aspect of the present invention, an image rotator is interposed between the zoom optical system and the eyepiece optical system in the assistant microscope so that the eyepiece optical system can rotate about the optical axis of the light beam.

  According to the first aspect of the present invention, since the zoom optical system has two systems and is oriented horizontally and the objective optical system is kept in the portrait orientation, the basic performance of shortening the vertical dimension of the entire microscope body is maintained to some extent. Thus, the diameter of the lens of the objective optical system can be reduced. In other words, since there are two systems, the lens itself constituting the zoom optical system can have a small diameter, and since each of the two light beams passes through the center of the small diameter lens in the corresponding system, two lenses are provided at both end portions of the lens. Even when the same magnification as in the case of “one system” through which the light beams pass is obtained, the interval between the two light beams (systems) can be reduced. Therefore, the diameter of the lens of the objective optical system that is continuously installed in the zoom optical system can be reduced, and the opening size of the inlet for installing this lens can also be reduced. Therefore, the horizontal width of the lower part of the microscope body does not widen and the shape is slim, so for the doctor, the eyes are shifted from the eyepiece provided on the upper part of the microscope body, and are positioned below the microscope body with the naked eye The work of observing the observation object becomes easier. In addition, since the lens itself constituting the zoom optical system can be reduced in diameter, the increase in the vertical dimension of the microscope main body due to the vertical objective optical system can be offset.

  Further, since the objective optical system is oriented vertically, the vertical light flux reflected from the observation object can be directly taken in. In this way, since there is no need to bend the optical axis by another optical element, the optical path from the observation target to the objective optical system is shortened, and a wide range can be observed at a low magnification even with a narrow inlet. Therefore, slimming similar to the above can be achieved. Furthermore, since an optical element for bending the optical axis is not necessary, the number of parts can be reduced and the structure near the entrance of the microscope main body can be simplified. Since the illumination optical system irradiates the observation target with illumination light from an oblique direction, a necessary shadow is generated at the observation site, and the observation site can be observed more stereoscopically. Since the lens constituting the objective optical system has a shape in which the end on the illumination optical system side is cut, interference between the lens of the objective optical system and the illumination optical system can be avoided.

  And since the assistant microscope is detachable from the microscope body, if it is removed when not necessary, the observer's line of sight is not obstructed by the assistant microscope, ensuring a wide visual field of visual observation around the microscope body. Is done. In addition, since the assistant microscope is attached to the entrance of the microscope main body from the observation target side, the microscope main body from which the assistant microscope has been removed is simply open to the observation target side. The structure itself is complete, and observation with only the microscope body can be performed without any problem. Furthermore, since the assistant microscope has an optical system independent of the microscope main body, the magnification of the assistant microscope can be changed independently from the microscope main body. Therefore, in the case of using as a surgical microscope, it becomes easy to perform a combination operation by two doctors, such as a main doctor operating a deep lesion and an assistant doctor processing a shallow part.

  According to the second aspect of the invention, since the branched light beam for the assistant microscope can be taken out from one light branching means, the number of parts constituting the assistant microscope can be reduced. In addition, because the zoom optical system is tilted, the distance in the horizontal direction of the assistant microscope can be reduced. Makes it easier to work.

  According to the invention described in claim 3, since the optical axis of the branched light flux taken into the assistant microscope is bent in a crank shape in a direction away from the observation object, the shape of the assistant microscope is offset in a direction away from the observation object. Therefore, a working space can be secured on the observation side of the assistant microscope.

  According to the fourth aspect of the present invention, since the light beam from the observation object is taken into the assistant microscope by the light reflecting means, the light amount of the light beam taken into the assistant microscope is larger than when the branched light beam is taken in by the light branching means. And a bright observation image can be obtained.

  According to the invention described in claim 5, since the image rotator is provided, the eyepiece optical system can be rotated around the optical axis of the light beam.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

  1 to 4 are views showing a first embodiment of the present invention. In the following description, the X direction indicated by an arrow in FIG. 1 is “front side”, and the Y direction is “rear side”. The vertical direction is “vertical” and the horizontal direction is “lateral”.

  The stereoscopic microscope 1 according to this embodiment is used as a surgical microscope, and includes a microscope body 2 and various accessory devices that can be connected thereto. On the front side of the microscope body 2, an inlet 3 for taking in the light beam K1 is formed at the lower part, and a variable lens barrel 4 that can be tilted in the vertical direction is provided at the upper part. A possible pair of eyepieces 5 is provided.

  The intake port 3 is substantially directly below the fulcrum of the variable barrel 4 and has a slim shape therebetween. The microscope main body 2 extends from the slim portion to the rear side, and a light outlet 6 is formed on the side surface. The accessory device in this embodiment includes a stereoscopic assistant microscope 7 that can be attached to the inlet 3 of the microscope body 2 from the lower side only when necessary, and a non-stereoscopic assistant microscope that can be attached to the outlet 6 of the microscope body 2 only when necessary. 8, CCD camera (TV) 9, 35 mm camera 10, counter mirror 11 attached to the rear end of the microscope body 2 from the rear side only when necessary, liquid crystal monitor attached to the rear end of the microscope body 2 from the lower side only when necessary Image projection device) 12. The attachment of these accessory devices to the microscope main body 2 can be performed by a known attachment.

  Next, the optical system will be described. The microscope main body 2 is for observing the affected part T, which is an “observation target”, from above, and the light beam K1 reflected by the affected part T is introduced from the lower side to the intake port 3 of the microscope main body 2 in the vertical direction. Is done. A horizontal illumination optical system 13 is disposed below the microscope body 2 so as to face the intake port 3. The illumination light guided by the fiber 14 becomes a light beam having a predetermined spread, is reflected by the mirror M1, and illuminates the affected area T from an oblique direction different from the light beam K1. Since the illumination light is oblique, a necessary shadow is generated on the affected part T, and the affected part T can be observed more stereoscopically.

  A part of the light beam K1 from the affected part T is branched by a beam splitter (which may be a half mirror) B1 as “light branching means” and guided to the assistant microscope 7 side as a branched light beam K2. A horizontal objective optical system 15 composed of three lenses L1 is disposed at the same height as the beam splitter B1. After passing through the objective optical system 15, the branched light beam K2 is reflected obliquely upward by the mirror M2, and divided into two left and right zoom optical systems 16 (see FIG. 4). The branched light beam K2 that has passed through the zoom optical system 16 enters the variable barrel 17 of the assistant microscope 7, and forms an image at the eyepiece 19 through the internal eyepiece optical system 18.

  According to the assistant microscope 7 of this embodiment, since the optical system capable of stereoscopic viewing is independently provided, the magnification of the assistant microscope 7 can be changed independently from the microscope main body 2. Therefore, when using the stereoscopic microscope 1 as a surgical microscope as in this embodiment, the main doctor looking at the affected area T with the microscope body 2 operates a deep lesion and looks at the assistant microscope 7. It is easier for two doctors to perform combination surgery, for example, an assistant doctor handles a shallow part.

  Further, since the assistant microscope 7 is detachable from the microscope main body 2, if it is removed when not necessary, the assistant microscope can be used when the affected part T is visually observed by slightly shifting the eye from the eyepiece 4 of the microscope main body 2. 7 does not block the line of sight, and a wide visual field of visual observation around the microscope body 2 of the main doctor is secured. Furthermore, since the assistant microscope 7 is attached to the inlet 3 of the microscope main body 2 from the lower side, the microscope main body 2 from which the assistant microscope 7 is removed has only the inlet 3 opened on the lower side. Thus, the structure of the microscope main body 2 itself is complete, and observation with only the microscope main body 2 can be performed without hindrance.

  In addition, since the branched light beam K2 can be extracted by only one beam splitter B1 provided on the assistant microscope 7 side, the number of parts constituting the assistant microscope 7 can be reduced. Further, since the zoom optical system 16 is inclined, the distance D (see FIG. 2) in the horizontal direction from the inlet 3 of the microscope body 2 to the eyepiece 19 of the assistant microscope 7 is also reduced. Therefore, when the assistant doctor reaches the affected part T and performs an operation, the affected part T becomes close and it is easy to perform the operation.

  Next, the optical system of the microscope body 2, the counter mirror 11, and the liquid crystal monitor 12 will be described. Description of the optical system of other accessory devices is omitted.

  The light beam K1 transmitted through the beam splitter B1 is subjected to focus adjustment by a longitudinal objective optical system 21 including three lenses L2. The lens L2 constituting the objective optical system 21 has a shape in which the end on the illumination optical system 13 side is cut, and avoids interference with the illumination optical system 15 when the lens L2 is movable. The light beam K1 that has passed through the objective optical system 21 is reflected rearward by the prism P1, and is guided to two zoom optical systems 22 that are arranged in parallel in the horizontal direction. Since the zoom optical system 22 extends from the upper part of the objective optical system 15 to the rear side (in a direction away from the variable lens barrel 4), the zoom optical system 22 does not interfere with the structure on the variable lens barrel 4 side. Each zoom optical system 22 has a structure in which a pair of smaller-diameter lenses that are freely movable are arranged between small-diameter lenses, and the vertical dimension of the zoom optical system 22 itself is small (the objective optical system 21 is oriented vertically). Adjusted to offset the increase in vertical dimension due to

  The light beam K1 that has passed through the zoom optical system 22 is folded back toward the variable lens barrel 4 by the beam splitter B2 and the prism P2, reaches the eyepiece optical system 23 on the variable lens barrel 4 side, and forms an image at the eyepiece unit 5. A beam splitter B3 that branches the light beam to the left and right is installed immediately before the eyepiece optical system 23, and the light beam branched here is taken out from the outlet 6.

  The light beam K3 transmitted through the zoom optical system 22 without being folded back by the beam splitter B2 is guided into the counter mirror 11 attached to the rear end of the microscope body 2. The counter mirror 11 includes a prism P3 and a lens L3 on the left and right, respectively, and can observe a stereoscopic image similar to that of the variable barrel 4. Note that a beam splitter B4 may be provided immediately in front of the counter mirror 11, and an outlet (not shown) for the light beam branched there may be formed on the side surface of the microscope body 2. Then, the same image as the observation image that can be viewed with the opposing mirror 11 can be taken. Providing such an opposing mirror 11 is suitable for surgery when two doctors face each other, such as in shaping or spinal surgery. The counter mirror 11 can also be removed when not in use. When the counter mirror 11 is not used, the field of view on the side of the variable lens barrel 4 can be brightened by changing the beam splitter B2 to a reflecting means such as a prism or a mirror.

  An opening / closing shutter 24 that slides left and right is provided below the beam splitter B2 immediately after the zoom optical system 22. The liquid crystal monitor 12 is attached from below through the opening / closing shutter 24. In the liquid crystal monitor 12, an electronic image on the liquid crystal display screen 25 can be taken into the beam splitter B2 via the lens L4 and the prism P4. Therefore, the electronic image of the liquid crystal monitor 12 can be observed by the variable lens barrel 4 or the counter mirror 11. Of course, the light beam can be taken out from the outlet 6 and guided to the accessory device. On the liquid crystal display screen 25, a CT or MRI image, or a sign such as an arrow by a surgical support navigation system can be displayed.

  If the light flux from the liquid crystal monitor 12 is blocked by the open / close shutter 24, only the electronic image can be seen in the variable barrel 4 and the counter mirror 11. If not blocked, the electronic image can be seen superimposed on the state of the affected part T in the field of view of the variable barrel 4 and the counter mirror 11. In this case, since the electronic image does not hide a part of the field of view but overlaps the field of view, the field of view itself is widely secured as usual. Unless the liquid crystal monitor 12 emits the light beam of the electronic image, only the state of the affected part T can be seen.

  In this embodiment, since the liquid crystal monitor 12 is removable, it can be removed when not in use. Moreover, since it can be removed, it is suitable for repair and adjustment of the liquid crystal monitor 12. Further, since the liquid crystal monitor 12 is mounted on the opposite side of the microscope body 2 from the variable lens barrel 4, the structure on the variable lens barrel 4 side is not complicated. For example, when the liquid crystal monitor 12 is provided on the variable lens barrel 4 side, a complicated optical system using an afocal light beam (parallel light beam) in the eye width adjustment mechanism and the trend adjustment (tilt adjustment) mechanism on the variable lens tube 4 side. However, if it is provided on the side opposite to the variable lens barrel 4 as in the present invention, it is not necessary to do so. Further, since the liquid crystal monitor 12 is provided on the side opposite to the variable lens barrel 4, the forehead of the doctor may hit the liquid crystal monitor 12 as in the case where the liquid crystal monitor 12 is attached to the variable lens barrel 4 side. Absent.

  Above all, in the microscope main body 2 of this embodiment, the zoom optical system 22 has two systems and is oriented horizontally, and the objective optical system 21 is left in the vertical orientation, so that the vertical dimension of the entire microscope main body 2 is shortened. The diameter of the lens L2 of the objective optical system 21 can be reduced while maintaining the basic performance to some extent. That is, since the two systems are used, the lens itself constituting the zoom optical system 22 can have a small diameter, and each of the two light beams K1 passes through the center of the small diameter lens in the corresponding system. Even if the same magnification is obtained as in the case of “one system” that allows two light beams to pass through, the interval between the two light beams K1 (system) can be reduced. Accordingly, the diameter of the lens L2 of the objective optical system 21 installed continuously to the zoom optical system 22 can be reduced, and the opening size of the intake port 3 where the lens L2 is installed can also be reduced. Therefore, the width in the horizontal direction at the lower part of the microscope main body 2 is not widened and the shape is slim. For the doctor, the eyes are shifted from the eyepiece 5 provided on the upper part of the microscope main body 2 and the It becomes easy to perform an operation of observing the affected part T located below.

  Moreover, since the objective optical system 21 is oriented vertically, the vertical light flux K1 reflected from the affected part T can be directly taken in. Thus, since it is not necessary to bend the optical axis by another optical element, the optical path from the affected part T to the objective optical system 21 is shortened, and a wide range can be observed at a low magnification even with the narrow inlet 3. Therefore, slimming similar to the above can be achieved. Furthermore, since an optical element for bending the optical axis is not required, the number of parts can be reduced, and the structure near the inlet 3 of the microscope body 2 can be simplified.

  5 to 7 are views showing a second embodiment of the present invention. In this embodiment, an assistant microscope 26 having another structure is shown. The feature of the assistant microscope 26 is that it is possible to form a working space S for the doctor below by displacing it in a crank shape in a direction away from the affected part T, and the horizontal axis α (see FIG. 5) for the variable lens barrel 27. This means that it can be rotated to the center.

  The light beam K4 from the affected part T is taken in by a mirror M3 arranged at a position different from the optical axis of the light beam K1 introduced to the entrance of the microscope main body (as shown in FIG. It may be taken in by a half mirror H arranged on the light beam K1 or a beam splitter). The angle of the mirror M3 is variable, and the angle changes depending on the distance from the affected part T, so that the light beam K4 from the affected part T can always be reflected in the horizontal direction. Then, the optical axis of the incorporated light beam K4 is bent upward in a crank shape by three mirrors M4 and M5 including the mirror M3. Thus, by bending the optical axis in a crank shape, the work space S as described above can be formed below the assistant microscope 26.

  The light beam bent in the crank shape is guided to the image rotator IR (see FIG. 7) after passing through the objective optical system 15 and the zoom optical system 16 that are horizontally arranged. Since the image rotator IR is arranged, the variable barrel 27 can be rotated about the horizontal axis α. The light beam that has passed through the image rotator IR is reflected by the mirror M 6, and then enters the eyepiece lens system 18 in the variable lens barrel 27 and forms an image at the eyepiece 19. In the second embodiment, since the light beam K4 from the affected part T is not branched from the light beam K1 for the microscope body but is uniquely taken in by the mirror M3, the amount of the light beam taken in is large and a bright observation image is obtained. can get.

  It can be used as a surgical microscope capable of three-dimensionally grasping an affected area in brain surgery or the like.

1 is an overall perspective view showing a stereoscopic microscope according to a first embodiment of the present invention. Sectional drawing which shows the optical system inside a stereomicroscope. The perspective view which shows the optical system inside a stereomicroscope. The perspective view which shows the optical system inside the assistant microscope which concerns on 1st Embodiment. Sectional drawing which shows the assistant microscope which concerns on 2nd Embodiment of this invention. The perspective view which shows the optical system inside the assistant microscope which concerns on 2nd Embodiment. Sectional drawing which shows an image rotator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stereomicroscope 2 Microscope main body 3 Inlet 6 Inlet 7, 26 Assistant microscope 11 Opposite mirror 12 Liquid crystal monitor (image projector)
13 Illumination optical system 15 Objective optical system (assistant microscope)
16 Zoom optical system (assistant microscope)
18 Eyepiece system (assistant microscope)
21 Objective optical system (microscope body)
22 Zoom optical system (microscope body)
23 Eyepiece system (microscope body)
24 Opening / closing shutters L1 to L4 Lenses B1 to B4 Beam splitter (light splitting means)
M1 to M6 mirror (light reflecting means)
P1 to P4 prism (light reflecting means)
H half mirror (light splitting means)
IR image rotator K1-K4 Luminous flux T Affected part (observation object)
S Work space X Front side Y Rear side

Claims (5)

A microscope main body in which a light beam from an observation target sequentially passes through an objective optical system, a zoom optical system, and an eyepiece optical system,
While the objective optical system is arranged in the vertical orientation with respect to the light beam from the observation target, the eyepiece optical system is located substantially above the objective optical system,
The zoom optical system is arranged in a parallel state divided into two systems that are in the horizontal state and at the same level in the vertical direction,
The light beam that has passed through the zoom optical system passes through the upper side of the zoom optical system and is folded back to the eyepiece optical system side.
An illumination optical system that irradiates illumination light to the observation object from an oblique direction is exposed near the entrance of the light beam from the observation object, and the lens constituting the objective optical system cuts the end on the illumination optical system side. Shape,
The lens of the objective optical system whose end is cut is a position where the diameter of the lens can be reduced, in a stereoscopic microscope that allows a light beam from an observation target to pass through,
A removable assistant microscope is attached to the entrance of the light beam from the observation target in the microscope main body from the observation target side, and the assistant microscope is an objective optical system, zoom optical system, and eyepiece optical system different from the microscope main body. A stereomicroscope characterized by having independently. The stereomicroscope according to claim 1,
A zoom optical system in which an assistant microscope takes in a branched light beam from one light branching means arranged on the same axis as the light flux at the entrance of the microscope body, and has a horizontal objective optical system that is at the same level in the vertical direction as the light branching means. A stereo microscope characterized in that the lens is tilted in a direction away from the observation target with respect to the objective optical system. The stereomicroscope according to claim 1,
The assistant microscope takes in a branched light beam from one light branching means arranged coaxially with the light beam at the entrance of the microscope body, and the optical axis of the branched light beam is bent in a crank shape in a direction away from the observation target. A stereo microscope. The stereomicroscope according to claim 1,
The assistant microscope takes in the light beam from one angle-variable light reflecting means arranged at a position different from the optical axis of the light beam at the entrance of the microscope body, and cranks the optical axis of the incorporated light beam away from the observation object. Stereo microscope characterized by bending. The stereomicroscope according to claim 3 or claim 4,
A stereoscopic microscope characterized in that an image rotator is interposed between the zoom optical system and the eyepiece optical system in the assistant microscope, and the eyepiece optical system is rotatable about the optical axis of the light beam.

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