JPWO1996002863A1 - Stereoscopic device - Google Patents

Abstract

(57) [Summary] The stereoscopic device of the present invention allows the viewer to view both images from a stereomicroscope and images from a stereoscopic fiberscope. According to the present invention, the viewer can view images from the stereomicroscope and images from the stereoscopic fiberscope without moving their eyes from the eyepieces. The present invention is characterized by the placement of a reflecting mirror located in the optical path switching section or in the optical path. The present invention can be used in medical surgery, etc.

Description

[Detailed Description of the Invention] Stereoscopic Vision Device Technical Field The present invention relates to a stereoscopic vision device that allows a user to view an object in three dimensions. In particular, the present invention relates to a stereoscopic vision device that allows users to view images from a stereomicroscope and a stereoscopic fiberscope without taking their eyes off the eyepieces.

BACKGROUND ART For example, surgery in ophthalmology and neurosurgery requires extremely delicate techniques, and in recent years, these procedures have come to be performed while observing the affected area using a stereomicroscope.

As shown in FIG. 15, the stereomicroscope has at least an eyepiece unit 1 and an objective unit 2 through which a pair of optical paths, a left-eye optical path 8l and a right-eye optical path 8r corresponding to the left and right eyes of an observer 7, pass.

The difference (viewing angle difference) θ between the viewing angles α and β of the two points S1 and S2 on the object of observation, which are sandwiched between the optical axes of the objective unit 2, is perceived by the observer 7 as a difference in distance between the observer 7 and the two points S1 and S2, enabling stereoscopic vision.

Incidentally, endoscopes (fiberscopes) are widely used as medical diagnostic and therapeutic tools, primarily for the digestive system, and their importance is increasing. In particular, ultrathin endoscopes with diameters of less than 1 mm have been developed in recent years, making it possible to observe not only the digestive system but also the insides of previously impossible-to-observe narrow and minute lumens, such as blood vessels, mammary glands, pancreatic ducts, the interior of the eye, and cerebral blood vessels.

Therefore, in recent years, in precision surgeries, a method has been adopted in which the entire surgical site is observed using a stereomicroscope and the details are examined using an endoscope.

However, when performing surgery using an endoscope, it is difficult to perform the surgery accurately if the sense of distance cannot be grasped from the image.

Therefore, a need arose for endoscopes that could provide stereoscopic vision of objects, and so, similar to the stereomicroscope described above, stereoscopic endoscopes equipped with two fiberscopes, one for each eye, were developed.

The principle of one example will be explained using Figure 16. The stereoscopic endoscope illustrated in Figure 16 includes an eyepiece unit 3 through which a pair of optical paths, a left-eye optical path 8l and a right-eye optical path 8r, corresponding to the left and right eyes of an observer 7, pass, a light guide 4 made of optical fiber, an objective unit 5, and a light guide 6 for illumination.

The difference θ between the viewing angles α and β of the two points S1 and S2 on the object of observation, which are sandwiched between the optical axes of the objective lens unit 5, is recognized by the observer 7 as the difference in distance between the observer 7 and the two points S1 and S2, enabling stereoscopic vision.

As a result, there are an increasing number of cases where a stereo microscope and a stereo endoscope are used together.

However, to switch from a stereo microscope to a stereo endoscope, the surgeon must temporarily move their eyes away from the stereo microscope and switch to the stereo endoscope. Conversely, to switch from a stereo endoscope to a stereo microscope, the surgeon must move their eyes away from the stereo endoscope and switch to the stereo microscope. Therefore, using both a stereo microscope and a stereo endoscope simultaneously requires shifting their eyes to each device, which is cumbersome. Furthermore, each time the surgeon shifts their eyes, the surgeon may need to adjust the field of view and focus. This interruption in observation while shifting or adjusting their eyes can waste time and place a strain on the surgeon.

The present invention has been made to solve the above problems and provides a stereoscopic device that allows observation using a stereoscopic microscope and a stereoscopic endoscope without having to turn one's eyes.

Disclosure of the Invention One aspect of the present invention is that, by operating the optical path switching unit, the optical path of the eyepiece is connected to either the optical path of a stereoscopic microscope or the optical path of a stereoscopic fiberscope, allowing a viewer to alternate between stereoscopic microscope images and stereoscopic fiberscope images with a simple operation without taking their eyes off the eyepiece.

Another feature of this invention is that by installing a reflecting mirror that transmits light from the stereoscopic fiberscope to the eyepiece in the optical path connecting the objective and eyepieces of the stereoscopic microscope, it is possible to form an image from the stereoscopic fiberscope within the image from the stereoscopic microscope. Therefore, you can simultaneously view the images from the stereoscopic microscope and the stereoscopic fiberscope without taking your eyes off the eyepieces.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a front view showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the fiberscope.

FIG. 3 is a diagram of an optical path according to one embodiment of the present invention.

FIG. 4 is a front view showing another embodiment of the present invention.

FIG. 5 is a diagram of an example of the optical path.

FIG. 6 is a plan view showing an image displayed on the eyepiece.

FIG. 7 is a plan view showing an image visually recognized by an observer.

FIG. 8 is a light path diagram for explaining the image alignment unit.

FIG. 9 is a side cross-sectional view showing the left half of the image alignment unit.

FIG. 10 is a side cross-sectional view showing another example of the image alignment unit.

FIG. 11 is a plan view showing an example of an image.

FIG. 12 is a plan view showing an example of an image.

FIG. 13 is a plan view showing an example of an image.

FIG. 14 is a plan view showing an example of an image.

FIG. 15 is a diagram showing the optical paths in a conventional stereomicroscope.

FIG. 16 is a diagram showing the optical path in a conventional endoscope.

BEST MODE FOR CARRYING OUT THE INVENTION [Example 1] Figure 1 shows one embodiment of the stereoscopic device of the present invention. This stereoscopic device 10 includes an eyepiece unit 11 having pairs of optical paths 8l and 8r corresponding to the left and right eyes of an observer 7, a stereomicroscope objective unit 12, a stereoscopic fiberscope objective unit 13, and an optical path switching unit 14. The optical path pairs of the stereomicroscope objective unit 12 and the stereoscopic fiberscope objective unit 13 are freely switched by the optical path switching unit 14, and either of the optical path pairs is connected to the optical path pair of the eyepiece unit 11.

The optical path switching unit 14 incorporates a pair of reflecting mirrors 15l and 15r. These reflecting mirrors 15l and 15r rotate in unison and are driven by a foot switch 16 to simultaneously switch the left-eye optical path 8l and the right-eye optical path 8r to either the stereomicroscope objective side or the stereoscopic fiberscope objective side.

Image alignment units 18 corresponding to the left-eye optical path l and right-eye optical path r are provided adjacent to the optical path switching unit 14 between the optical path switching unit 14 and the stereoscopic fiberscope objective unit 13. The image alignment units 18 and the stereoscopic fiberscope objective unit 13 are connected by flexible image fibers 17l and 17r corresponding to the left-eye optical path and right-eye optical path, respectively. The image alignment units 18 adjust the position, direction, and focus of the left and right images by moving and rotating the optical axes of the image fibers connected to them.

The stereoscopic fiberscope objective section 13 has image fibers 17l and 17r connected to the objective lens at the tip, and a light guide 21 arranged in parallel therewith.

Figure 2 shows a cross section of a fiberscope in which image fibers 17l, 17r and a light guide 21 are bundled. The fiberscope 26 includes an image fiber 17l for the left eye optical path, an image fiber 17r for the right eye optical path, and multiple light guides 21, 21, .... The fiberscope 26 shown in Figure 2 also includes tubular spacers 25, 25 for separating the image fiber 17l and the image fiber 17r for the right eye optical path, and light guides 21 are also provided within these spacers 25.

The light guide 21 is connected to a fiberscope light source 22, and illumination light from the fiberscope light source 22 passes through the light guide 21 and illuminates an observation object Sf through the stereoscopic fiberscope.

Similar to providing an objective lens at the tip of the image fibers 17l and 17r, it is also desirable to provide an illumination lens at the tip of the light guide 21.

Each of the image fibers 17l and 17r is a silica glass fiber made of GeO₂ -SiO₂Approximately 1,500 to 50,000 cores are made up of a common SiO₂or Si O₂-F cladding, and image circles arranged at predetermined intervals, and SiO covering these.₂ The fiber consists of a jacket and is further protected by a resin such as silicone resin or UV-curable resin. The core diameter is 2-10 μm, the image fiber diameter is 125-2000 μm, and the diameter including the protective resin layer is 135-3000 μm.

Each of these image fibers is housed in a guide tube that guides it. The guide tube is made of a resin such as polyimide, FEP, ETFE, tetrafluoroethylene, PE, PP, or PV, or stainless steel, and has an inner diameter of 135 to 3500 μm and an outer diameter of 150 to 4000 μm.

The light guide is a fiber made of multi-component glass, quartz glass, plastic, etc., with a diameter of 10 to 2000 μm.

The spacer is made of quartz glass, polyimide, FEP, ETFE, tetrafluoroethylene, resin such as PE, PP, or PV, or stainless steel, and has a diameter of 100 to 2000 μm. 0 to 10,000 light guides are inserted into this tubular spacer. Note that a spacer is not necessarily required; a predetermined number of solidified light guides can also serve as a spacer. Furthermore, if a pair of image fibers are arranged so that they contact each other within the coating tube described below and their vibration is suppressed, the spacer can be omitted.

These image fibers, light guides, etc. are placed in and covered by tubes made of resins such as polyimide or ethylene tetrafluoride, or stainless steel. The diameter of the covered tube is 0.3 to 10 mm.

The length of the fiberscope is 10 to 3500 mm for the insertion section and 0.2 to 10 m for the entire length.

Such a fiberscope is made as follows.

First, rod lenses with uniform imaging characteristics (angle of view, focal position, contrast, size, etc.) are attached to the tips of image fibers with uniform transmission characteristics (contrast, circularity, etc.). From these, a pair of image fibers with rod lenses that have uniform overall transmission image characteristics is selected. Next, a pair of light guide fiber bundles is created, either by stuffing a light guide into a tubular spacer or by solidifying the tips with adhesive or other means to form a round shape, and the tips are then glued together.

Next, a pair of guide tubes for guiding the image fibers are placed facing each other inside the covering tube, and a pair of spacers are also placed inside. Light guides are inserted into the gaps, and then the whole assembly is glued together.

The tip is then polished, and a lensed image fiber is inserted into the guide tube and glued in place.

Examples of fiberscopes that meet these requirements include:

The overall length is 2.0 m, the insertion section is 30 mm long, and the covering tube is made of stainless steel and has an outer diameter of 1.0 mm and an inner diameter of 0.9 mm.

Each image fiber 17l, 17r is a polyimide tube with an outer diameter of 0.4 mm and an inner diameter of 0.36 mm, with 5000 pixels, a pixel diameter of 300 μm, and a pixel composition of _SiO2 - _GeO2 for the core and _SiO2 -F for the clad, and is provided with a protective resin layer made of UV-cured resin with a thickness of 25 μm.

The tubular spacer is a polyimide tube with an outer diameter of 0.3 mm and an inner diameter of 0.25 mm.

The light guides are multi-component glass fibers with a diameter of 30 μm. 194 light guides are packed into the spacer with 37 light guides per space and 120 light guides packed into the gap.

Using the stereoscopic device configured as described above, an object can be observed, for example, as follows: First, the optical path switching unit 14 is set on the stereomicroscope objective unit 12 side, connecting the left-eye optical path 8l in the eyepiece unit 11 to the left-eye optical path 9l in the stereomicroscope objective unit 12, and connecting the right-eye optical path 8r in the eyepiece unit 11 to the right-eye optical path 9r in the stereomicroscope objective unit 12.

Therefore, the observer 7 visually recognizes an image of the observation object Sm through the stereomicroscope.

While observing the observation object Sm through the eyepiece 11, the focus of the stereomicroscope body 19, which includes the eyepiece 11 and the stereomicroscope objective 12, is adjusted to the observation object Sm by turning the focus adjustment knob 20.

Next, the optical path switching unit 14 is switched to the stereoscopic fiberscope objective unit 13 side. That is, by moving the angles of the reflecting mirrors 15l and 15r of the optical path switching unit 14, the left eye optical path 8l and the image fiber 17l at the eyepiece unit 11 are connected, and the right eye optical path 8r and the image fiber 17r at the eyepiece unit 11 are connected, and the left eye optical path 9l and the right eye optical path 9r from the stereomicroscope objective unit are blocked by the reflecting mirrors 15l and 15r.

The fiberscope light source 22 is turned on to illuminate the observation object Sf via the light guide 21.

In this way, the observer can visually recognize the observation object Sf through the stereoscopic fiberscope.

Furthermore, if one or both of the left and right image alignment units 18 are adjusted in advance to prevent the focus and relative positioning of the observed image from being disturbed and preventing a stereoscopic image from being obtained when the optical path switching unit 14 is switched from the stereomicroscope to the stereoscopic fiberscope objective unit 13, no further adjustments will be necessary.

Furthermore, the observation object Sf may or may not be within the field of view of the stereomicroscope body 19. In other words, if the observation object Sf is included in the observation object Sm, the stereoscopic fiberscope allows for magnified observation of a portion of the observation object Sm that was being observed with the stereomicroscope. Furthermore, if the observation object Sf is not included in the observation object Sm, the stereoscopic fiberscope allows for observation of a portion not observed with the stereomicroscope.

With the stereoscopic device described above, observer 7 can switch between the stereoscopic microscope image and the stereoscopic fiberscope image at any time by pressing foot switch 16 while keeping his or her eyes on eyepiece 11. Therefore, observer 7 can observe either object Sm or Sf at any time and instantaneously without having to use his or her hands to switch between the two images and without taking his or her eyes off eyepiece 11.

In particular, images from a stereo microscope and images from a stereoscopic fiberscope can be viewed without the need for sophisticated electrical conversion using an LCD or the like.

The above embodiment will be further explained with reference to the optical path diagram shown in FIG.

The objective lens 12 separates and receives the light reflected in two directions from the object of observation Sm, and both image lights pass through the left-eye optical path 9l and the right-eye optical path 9r in the objective unit, respectively, then pass through the erecting relay optical system 11a, which includes multiple lenses, and then pass through the left-eye optical path 8l or the right-eye optical path 8r in the eyepiece unit 11. In this state, the reflecting mirrors 15l and 15r in the optical path switching unit are both parallel to the optical path, and the image light from the objective lens 12 travels straight to the eyepiece unit 11 without being blocked by the optical path switching unit 14, allowing the observer 7 to observe the object of observation Sm as a stereoscopic image.

When the optical path switching unit 14 is switched, the reflecting mirrors 15l and 15r block the optical paths 9l and 9r from the stereomicroscope objective unit, and also reflect the image light incident from the stereoscopic fiberscope objective unit 13 via the image fibers 17l and 17r, and transmit it to the eyepiece unit 11 via the erecting relay optical system 11a.

The observation target Sf is illuminated by illumination light emitted from an illumination lens 23 via a light guide 21, preferably consisting of multiple optical fibers arranged parallel to each of the image fibers 17l and 17r, within the stereoscopic fiberscope. The reflected light is received as left and right image light by objective lenses 24 attached to the tip of each of the image fibers 17l and 17r, and transmitted by the image fibers 17l and 17r corresponding to the left-eye optical path l and the right-eye optical path r, respectively, to the respective image alignment units 18. Each of the image fibers 17l and 17r is preferably a fiber bundle for image transmission, and to achieve a small diameter, it is preferable that the image fibers be multi-core optical fibers.

The left and right image lights transmitted via the image fibers 17l and 17r may be bent or rotated asymmetrically. Therefore, when received directly by the eyepiece 11 combined with the stereomicroscope objective 12, they are not necessarily positioned or oriented properly for stereoscopic observation. Therefore, the incorrect position and direction of the left and right image lights are corrected using the image alignment unit 18 or a reflector before being transmitted to the optical path switching unit 14. The image alignment unit 18 is provided at the output end of each of the image fibers 17l and 17r. It can move each output end in the optical path direction (z) and two orthogonal directions (x and y), and can also be fixed by applying a rotation R. Adjustments in the x and y directions can also be made using a reflector. These adjustments allow the image lights from the stereoscopic fiberscope objective 13 to be viewed as a stereoscopic image. Adjustment of the image alignment unit 18 is not necessary for each observation unless the scope part is changed.

The image light beams erected left and right by the image alignment unit 18 pass through the image fiber relay lens 14a, are reflected by the reflecting mirror 15, and then pass through the erecting relay optical system 11a to the eyepiece unit 11, where they are viewed as a stereoscopic image by the observer 7.

In the above embodiment, the optical path switching unit 14 uses a reflecting mirror, but is not limited to this. For example, a half mirror or a prism may also be used. Furthermore, as described above, the optical path can be switched by rotating the mirror around an axis perpendicular to the optical path. Alternatively, the mirror may be driven by a solenoid or the like to move in and out across the optical path.

Furthermore, when using a half mirror or small mirror, switching between the stereomicroscope objective and the stereoscopic fiberscope objective can be achieved without the need for a drive system by blocking either the light entering the objective or the optical fiberscope.

While the above embodiment is for use by a single observer, the stereoscopic device of the present invention is not limited to this. For example, by splitting each of the optical paths 8l and 8r between the erecting relay optical system 11a and the eyepiece 11 into two paths, and connecting one of the split paths to the eyepiece 11 and the other to another eyepiece, multiple people can view the images produced by the stereoscopic device. Alternatively, the other split path could be connected to a TV camera device, which would alternately project the left and right images (l and r) onto a monitor. The monitor images could then be viewed by wearing glasses with electronic shutters that alternately open and close in synchronization with the projected images. This would result in a stereoscopic device that allows not only the operator but also many people to simultaneously view the stereoscopic images.

The image alignment unit 18 will now be described in further detail.

As shown in FIG. 8, the left-eye optical path 8l and the right-eye optical path 8r passing through the eyepiece unit 11 are connected by driven reflectors 15l and 15r to the left-eye optical path 9l and the right-eye optical path 9r from the objective lens 12 of the stereomicroscope, and to the image fiber 17l for the left-eye optical path and the image fiber 17r for the right-eye optical path of the stereoscopic fiberscope.

There is no problem when optical paths 8l and 8r passing through the eyepiece 11 are connected to the optical paths 9l and 9r from the objective lens 12 of a stereo microscope. However, when optical paths 8l and 8r passing through the eyepiece 11 are connected to the optical path of a stereoscopic fiberscope, the image position and direction may be misaligned. This is adjusted using the image alignment unit 18 or reflectors 15l and 15r. The image alignment unit 18 adjusts the focus and optical axis using various lenses 38, 38, etc., and performs left-right image inversion using a prism 36.

The image alignment unit 18 actually uses components such as those shown in Figure 9. In this configuration, image light entering the image alignment unit 18 from the image fiber 17l is adjusted to the optimal position and direction by extending and rotating the optical axis adjustment cell 40 equipped with the lens 38 and by passing through the prism 36 after being inverted left and right, and then transmitted to the eyepiece.

Furthermore, as shown in Figure 10, the optical axis from the image fiber can be adjusted by devising a connection method for the image fiber. That is, light from the image fiber 17l is incident from below, passes through the lens, and is then inverted left and right by the reflecting mirror 27.

The image alignment unit, which is connected to such a fiberscope and attached to a stereomicroscope, can be integrated into a single, independent unit, allowing it to be attached to a variety of general-purpose stereomicroscopes, broadening its application.

[Example 2] A stereoscopic device such as that shown in Figures 4 and 5 can also be used. In this device, reflectors 28, 28 are provided in the optical path from the stereoscopic fiberscope, and are located in the optical paths 30l, 30r connecting the eyepiece 11 and the objective 12 of the stereomicroscope, so that the reflectors 28 do not completely block the optical paths 30l, 30r.

In this manner, as shown in Figure 6, images 33l and 33r from the fiberscope are formed in the left and right eyepieces 11, appearing to overlap images 32l and 32r from the stereomicroscope. Therefore, when the same object is observed using both the stereomicroscope and the fiberscope, the observer can see part of image 32 from the stereomicroscope in image 33 from the fiberscope, as shown in Figure 7.

It is also possible to use a half mirror instead of this reflecting mirror.

Furthermore, the position of the image 33 from the fiberscope within the image 32 from the stereomicroscope is adjusted by the tilt of the reflecting mirror 28 and the image alignment unit.

Observing images from a stereoscopic fiberscope requires illumination from the light guides attached to the stereoscopic fiberscope. Therefore, by stopping illumination from the light guides, the image 33 from the fiberscope disappears, and the observer is left viewing only the image 32 from the stereomicroscope. In other words, the fiberscope image can be turned on and off by manipulating the light guide. The stereoscopic fiberscope image can also be turned on and off by attaching and detaching the light-shielding cap to the tip of the objective of the stereoscopic fiberscope.

If a reflecting mirror 28 is provided in a portion of the optical path 30 of a stereomicroscope, the overall field of view of the image remains unchanged, but the amount of light is reduced. Therefore, it is desirable to provide an objective light source means 42 in the objective section 12 of the stereomicroscope to illuminate the object being observed. In this case, it is desirable to reduce the illumination intensity by not illuminating the position of the image 33 from the stereoscopic fiberscope and its surrounding area within the image 32. This is because the image 33 from the stereoscopic fiberscope is generally darker than the image 32 from the stereomicroscope, and therefore it is better to darken the surrounding area of the image to make the image 33 from the stereoscopic fiberscope clearer.

For example, as shown in FIG. 11, it is desirable to darken only the position of the image 33 from the stereoscopic fiberscope and its surrounding area 44 within the image 32 from the stereoscopic fiberscope, or, as shown in FIGS. 12, 13, and 14, to darken the entire ranges 46, 48, and 50 forming the image 33 from the stereoscopic fiberscope.

In order to darken the peripheral portion of the image captured by the stereoscopic fiberscope, it is desirable to provide a mask on the objective light source means 42 to block the light from the objective light source means 42 from irradiating the corresponding portion.

Furthermore, if the light intensity of the stereoscopic fiberscope image is significantly lower than that of the stereomicroscope image, and the stereoscopic fiberscope image cannot be viewed unless the stereoscopic fiberscope image is formed in a dark area, the formation of the stereoscopic fiberscope image 33 within the stereomicroscope image 32 can be controlled on and off by operating the objective light source means 42 of the stereomicroscope, rather than the fiberscope light source 22, and by determining whether or not to darken the periphery of the formed stereoscopic fiberscope image.

For example, the formation of an image of the stereoscopic fiberscope 33 in the stereoscopic microscope image 32 can be controlled on or off by attaching or removing a mask.

Furthermore, since the amount of light in an image captured by a stereomicroscope is affected by the area of the reflecting mirror 28 in the optical path 30, the amount of light can also be increased or decreased by moving the reflecting mirror 28 out of the optical path 30.

The stereoscopic device configured as shown in Figures 4 and 5 allows the observer to simultaneously view the stereoscopic microscope image 32 and the stereoscopic fiberscope image 33. Therefore, there is no need to temporarily move the observer's eyes away from the stereoscopic microscope to view the stereoscopic fiberscope image from the stereoscopic microscope image.

In particular, this stereoscopic device can form a stereoscopic fiberscope image within a stereomicroscope image solely by optical means without using electronic circuits, making it simple, accurate, and inexpensive.

INDUSTRIAL APPLICABILITY The stereoscopic device of the present invention allows the observer to quickly switch between images from the stereomicroscope objective and the stereoscopic fiberscope objective, or to simultaneously observe them, without taking their eyes off the eyepieces. Therefore, during medical surgery, the affected area can be viewed using both the stereomicroscope and the stereoscopic fiberscope.

───────────────────────────────────────────────────── (Note) This publication is based on the publication published internationally by the International Bureau of Patents (WIPO). The effect of the international publication of the Japanese patent application (Japanese utility model registration application) related to this publication arises pursuant to Article 184-10, Paragraph 1 of the Patent Act (Article 48-13, Paragraph 2 of the Utility Model Act) and is unrelated to this publication.

Claims (5)

[Claims] 1. A stereoscopic device comprising an eyepiece unit having a pair of optical paths corresponding to the observer's left and right eyes, a stereomicroscope objective unit, a stereoscopic fiberscope objective unit, and an optical path switching unit, wherein the optical path switching unit connects the optical paths of the eyepiece unit to either the optical paths of the stereomicroscope objective unit or the optical paths of the stereoscopic fiberscope objective unit, allowing the observer to switch between images from the stereomicroscope and images from the stereoscopic fiberscope. 2. The stereoscopic device according to claim 1, wherein the optical path switching unit is a reflecting mirror, a half mirror, or a prism. 3. The stereoscopic device according to claim 1 or 2, characterized in that an image alignment unit is provided in each of the optical paths for the left and right eyes between the stereoscopic fiberscope objective unit and the optical path switching unit, which adjusts the images by moving and rotating the optical axes of each optical path. 4. A stereoscopic device comprising an eyepiece unit, a stereoscopic microscope objective unit, and a stereoscopic fiberscope objective unit, each having a pair of optical paths corresponding to the observer's left and right eyes, wherein a reflecting mirror is provided in the optical path connecting the eyepiece unit and the stereoscopic fiberscope objective unit, and an image from the stereoscopic fiberscope is formed within an image from the stereomicroscope. 5. The stereoscopic viewing device according to claim 4, further comprising an objective light source means for partially adjusting the illuminance of the image formed by the stereomicroscope.