JP2000019411A - Illuminator for stereoscopic microscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an illuminator for stereoscopic microscope. SOLUTION: Illuminating light emitted from a light source 1 is condensed by a convex lens 8 through a convex lens 4, filters 5a to 5c and a concave lens 7 which are arranged nearly in the horizontal direction, reflected perpendicularly downward by a reflection member 10b, reflected upward from a cylindrical reflection member 11 by reflection in the upward direction by a conical mirror 9 and reflection in the upward direction of the outer periphery by the light shielding of a circular light shielding plate 15, and passes through a sample placing transparent member 13, so that a dark-field illumination of a sample 14 is realized. Meanwhile, the illuminating light passing the diffused by a diffusing member from the lens 8 is reflected perpendicularly upward by the member 10b and passes through the member 13, so that a bright-field illumination of the sample 14 is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination device used for an observation optical system of a stereo microscope.

[0002]

2. Description of the Related Art Conventionally, as an illuminating device for a stereomicroscope, for example, there is one disclosed in Japanese Utility Model Publication No. 45-11051. FIG. 14 shows a cross-sectional view of such an illuminating device, in which a light source 18 is arranged in a cylindrical mirror 19, and light traveling from the light source 18 to the surrounding direction is reflected by the inner surface of the mirror 19, and is positioned above. A dark-field illumination system for illuminating the sample 20; and a bright-field illumination system for illuminating the sample 20 by uniformly diffusing upward light from the light source 18 through the diffusion plate 21. The field illumination system can be selectively switched by inserting and removing the shutter 22. Here, in the drawing, 23 is a container, 24 is a lid, 25 is a window, 26 is a support frame, 27 is a connecting rod, 28 is a support portion, 29 is a bowl-like frost plate, 30 is an iris diaphragm, and 31 is stray light prevention. Light-shielding part,
32 is a bearing frame, and 33 is an arm.

On the other hand, as another example of a conventional illumination device for a stereomicroscope, there is one disclosed in Japanese Patent Publication No. 5-16567. FIG. 15 shows a cross-sectional view of such an illuminating device, in which a cylindrical mirror 35 is disposed above a light source 34 and a light shielding plate 36 is disposed in a hollow portion of the cylindrical mirror 35. In the upward light from the light source 34, the light incident on the inner reflecting surface 35 a avoiding the light shielding plate 36 is reflected there and illuminates the sample 38 obliquely from between the light shielding plate 36 and the iris diaphragm 37. Darkfield illumination system. Here, in the drawings, O is an optical axis, and 39 is an objective lens. Those having such an oblique illumination system can obtain a three-dimensional contrast of a transparent object,
Very convenient for sample observation.

[0004]

By the way, in general, in a stereomicroscope, inspection of a sample, observation of a living cell, work, and the like are performed. However, for an observer who performs these operations for a long time, a sample of a transmission illumination mount is required. If the upper surface of the transparent member on which the sample is placed (hereinafter, referred to as the sample mounting surface) is located at a high position, the burden on sample operation such as sample replacement and manipulator operation increases, reducing work efficiency and reducing work efficiency. This may cause a mistake, and for this reason, it is required that the height from the bottom surface of the transmission illumination gantry to the sample mounting surface be low. In addition, the size of the transmissive illumination mount in the horizontal direction is required to be small due to reasons such as sample handling, convenience of carrying, and securing of a place for placement.

However, in the prior art disclosed in Japanese Utility Model Publication No. 45-11051, a light source 18 used in a bright field illumination system and a dark field illumination system is arranged vertically below a window 25 on which a sample 20 is placed. Are located in For this reason,
The height required to dispose the light source 18 in the vertical direction is determined by the window 25.
From the bottom to the bottom of the transmitted light base, and it is difficult to further reduce this height. Therefore, it is conceivable that the light source 18 is tilted in the horizontal direction to cope with it. In this case, the height required for the arrangement can be reduced as compared with the case where the light source 18 is arranged in the vertical direction. However, arranging the light source 18 in the horizontal direction not only prevents the socket of the light source 18 from shielding the illumination light to obtain a uniform dark-field illumination, but also provides a uniform illumination depending on the directionality of the illumination of the light source 18 itself. Is not obtained. For this reason, it is difficult to reduce the height from the bottom surface of the transmission illumination base to the sample mounting surface in the related art.

Also, in the prior art disclosed in Japanese Patent Publication No. Hei 5-16567, the light source 34 used for dark field illumination is disposed vertically below the sample 38. It has been difficult to reduce the height from the sample mounting surface configured by the objective arrangement to the bottom surface of the dark field illumination device. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a lighting apparatus for a stereomicroscope, which can reduce the size of the apparatus.

[0007]

According to the first aspect of the present invention,
In a lighting device of a stereomicroscope that irradiates illumination light from below a sample surface, a reflecting member arranged vertically below the sample surface, an illumination optical system that causes illumination light of a light source to enter the reflecting member, and the reflecting member And a conical mirror that reflects the illumination light of the illumination optical system reflected by the reflection member to the sample surface side, and is formed at a focal position of the illumination optical system. A real image of the light source is formed as a virtual image vertically below the conical mirror via the reflecting member and the conical mirror.

According to a second aspect of the present invention, in the first aspect of the invention, there is further provided a bright-field optical system having a diffuser plate which is disposed so as to be insertable into and removable from the illumination optical system and diffuses light from the light source. A circular light-shielding plate which is disposed vertically removably below the sample surface and partially shields light from the conical mirror, and a circular light-shielding plate which is disposed between the sample surface and the circular light-shielding plate. A dark-field optical system having a cylindrical reflecting member that reflects light toward the sample surface, wherein the reflecting member transmits illumination light from the light source incident from the illumination optical system to the conical mirror side. Alternatively, it can be selectively switched to the sample surface side.

According to a third aspect of the present invention, in the second aspect of the present invention, the reflecting member is rotatably provided, and the sample surface is deflected by illumination light from the light source incident from the illumination optical system. Oblique lighting is enabled.

As a result, according to the first aspect of the present invention,
Even though the light source does not actually exist, a lighting effect equivalent to the presence of the light source can be obtained below the conical mirror, so that the sample mounting surface is maintained while maintaining the same lighting effect as the conventional example. From the upper surface to the bottom surface of the pedestal for transmission illumination.

According to the second aspect of the present invention, the optical arrangement of the bright-field optical system includes a conical mirror or a reflection member which is an optical component of the dark-field optical system. The switching of the field optical system does not switch all the optical systems independent of the bright and dark fields, but only a part of the optical system, so the space required for evacuation for switching the optical system can be minimized, and The width of the gantry can be reduced. According to the third aspect of the present invention, at the time of bright-field illumination, the sample surface can be skew-illuminated with illumination light from the light source by appropriately tilting the reflecting member.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a schematic configuration of a stereo microscope to which an illumination device of the present invention is applied. In the figure, SK is a base for transmitted illumination.
Is a device capable of switching between a dark-field optical system and a bright-field optical system, and has a light-dark field optical system switching knob L2 and a filter insertion / removal knob F. In addition, this transmission illumination base SK is provided with a lamp house LH,
A mirror body KB is provided via a focusing unit S having a focusing handle SH. This mirror body KB has an interchangeable objective lens T
Further, an eyepiece tube K is provided so that an observation image of a sample (not shown) on the transmission illumination base SK projected through the objective lens T can be viewed through the eyepiece tube K.

FIG. 2 shows a schematic configuration of a stereoscopic microscope constructed as described above when a dark-field optical system is configured.
In this case, the lamp house LH has the light source 1 and arranges the collector lens 2 and the reflection mirror 3 vertically below the light source 1 so that the illumination light emitted vertically downward from the light source 1 intersects the intersection P1 with the reflection mirror 3. To reflect in a substantially horizontal direction.

The transmission illumination base SK includes a convex lens 4 and filters 5a, 5b, 5 constituting an illumination optical system along the optical axis of the illumination light substantially horizontally reflected by the reflection mirror 3.
c, a reflecting member 10b is arranged via a concave lens 7 and a convex lens 8. In this case, the filters 5a, 5b, 5c can be inserted into and removed from the optical axis via an insertion / removal mechanism (not shown) by operating the filter insertion / removal knob F described above.

The reflecting member 10b switches between a dark-field optical system and a bright-field optical system. When a dark-field optical system is formed, the incident optical axis is reflected vertically downward at the intersection P2. The conical mirror 9 is arranged on the optical axis perpendicular to the sample mounting surface passing through the intersection P2. The conical mirror 9 reflects light rays reflected downward by the reflecting member 10b upward.

A cylindrical reflecting member 11 is disposed above the conical mirror 9, and a circular light shielding plate 15 is disposed on the central axis of the reflecting member 11, and the light is reflected upward by the conical mirror 9. The light is limited only in the upward direction on the outer periphery by the circular light shielding plate 15, and the inner peripheral surface 11a of the cylindrical reflecting member 11 is
And is reflected upward from the inner peripheral surface 11a. That is, the light reflected upward by the conical mirror 9 and reflected upward by the light blocking by the circular light-shielding plate 15 is reflected upward by the inner peripheral surface 11a of the cylindrical reflecting member 11 toward the inside, Mount S for transmitted illumination
The illumination light from the light source 1 is applied to the sample mounting transparent member 13 for the sample 14 arranged on the K upper surface.

According to such an illumination optical system, the illumination light emitted from the light source 1 passes through the vertically lower collector lens 2, is reflected in the substantially horizontal direction at the intersection P1 of the reflection mirror 3, and is substantially horizontally emitted. After passing through the convex lens 4 and the filters 5a, 5b, 5c arranged along the axis, the light is relayed by the concave lens 7, condensed by the convex lens 8, is reflected downward by the reflecting member 10b, and is reflected downward by the conical mirror 9. Due to the upward reflection and the light reflected by the circular light-shielding plate 15, the light is reflected upward toward the outer periphery by the light reflected by the circular reflection member 15, and is reflected toward the inside upward from the cylindrical reflection member 11, resulting in annular illumination with a large aperture angle. The sample 14 is illuminated in the dark field through the transparent member 13.

On the other hand, when a bright-field optical system is constructed, as shown in FIG.
2, the light is reflected vertically upward. That is, the light beam reflected in the substantially horizontal direction at the intersection P1 of the reflecting mirror 3 is
Convex lens 4, filters 5a, 5b, 5c, diffusing member 6,
When the light enters the intersection P2 of the reflecting member 10a via the concave lens 7 and the convex lens 8, the light is reflected vertically upward at the intersection P2. On a vertical optical axis passing through the intersection P2, a cylindrical reflecting member 11, a diffusing member 12 having a Fresnel surface 12a and a diffusing surface 12b which hardly increase in thickness even with a large lens, a sample mounting transparent member 13, and The sample 14 is arranged.

According to such an illumination optical system, the illumination light emitted from the light source 1 passes through the vertically lower collector lens 2, is reflected in the substantially horizontal direction at the intersection P1 of the reflecting mirror 3, and is substantially horizontally emitted. After passing through the convex lens 4 and the filters 5a, 5b, 5c arranged along the axis, the light enters the diffusion member 6, where the light diffused is relayed by the concave lens 7,
The light is condensed by the convex lens 8, is reflected upward by the reflection member 10a, enters the Fresnel surface 12a of the diffusion member 12, and
The sample 14 is diffused by the diffusion surface 12b and illuminates the sample 14 in a bright field through the sample mounting transparent member 13.

Next, the switching mechanism between the dark field optical system and the bright field optical system will be described with reference to FIGS. In this case, FIG. 4 shows a dark field optical system when the sample mounting transparent member 13 of the transmission illumination base SK is removed and viewed from above, and FIG. 5 shows a bright field optical system in the same case. so,
4 corresponds to FIG. 2 and FIG. 5 corresponds to FIG. 3, and the same parts as those in FIGS. 2 and 3 are denoted by the same reference numerals.

In this case, the reflection member 10b and the circular light-shielding plate 15 described in FIG. 2 are integrally connected by a slider S2, and the reflection member 10a and the Fresnel surface 12a and the diffusion surface 12b described in FIG. The diffusion member 12 and the diffusion member 6 are integrally connected by a slider S1. Then, the slider S1 and the slider S2 are connected by a connecting member L1, and the bright / dark field optical system switching knob L2 provided on the slider S2 is horizontally inserted / removed, whereby a dark field shown in FIG. The optical system or the bright field optical system shown in FIG. 5 can be selectively switched.

With such a configuration, in the case of the dark-field illumination shown in FIG. 2, the illumination is the same as the dark-field illumination emitted from the virtual light source 1 'shown in FIG. That is, the dark-field illumination from the virtual light source 1 ′ shown in FIG. 6 is the same as the case of FIG. However, in the conventional one, since the actual light source 1 must be arranged at the position of the virtual light source 1 'in FIG. 6, a space for disposing the light source 1 is required. Bottom H '
Must be lowered to the position. The same can be said for the case of FIG. 14, which is a conventional example. That is, in the case of FIG. 14, a problem occurs in the bright field illumination, and if an attempt is made to obtain an illumination effect equivalent to the bright field illumination described in FIG.
In the vertical direction near the conical mirror 9 in FIG.
In order to secure a space therefor, the bottom surface of the transmission lighting base SK must be lowered to the position of the virtual bottom surface H ′.

On the other hand, according to the optical system of the present embodiment, the real image of the light source 1 supposed to be formed at the focal position of the convex lens 8 is reflected by the reflecting member 10b and the conical mirror 9 so that the conical mirror 9 Created as a virtual image vertically below.
Therefore, the illumination effect equivalent to the presence of the light source can be obtained below the conical mirror 9 even though the light source does not actually exist, thereby providing the illumination effect equivalent to the conventional example. While maintaining the height, the height from the top surface of the sample mounting transparent member 13 to the bottom surface of the transmission illumination base SK can be reduced.

In this embodiment, the optical arrangement of the bright-field optical system includes the conical mirror 9 and the reflection member 11, which are optical components of the dark-field optical system. The switching of the dark-field optical system does not have to switch all of the optical systems independent of the bright-dark field, but only a part of the optical system. The lateral width of the lighting base SK can be reduced.

Accordingly, since the height from the sample mounting transparent member 13 to the bottom of the transmission illumination base SK can be reduced, the operator's sample can be used for sample inspection, live cell observation, experiments using a manipulator, and the like. The burden on the operation can be greatly reduced. Further, since the lateral width of the transmission illumination base SK can be reduced, the sample can be easily operated, it is convenient to carry, and the space for the place can be reduced.

Preferably, the bright / dark field optical system switching knob L2 may use a mechanism utilizing this principle, a timing belt, a mechanism utilizing gears, or the like in order to reduce the insertion / removal distance. The switching direction between the slider S2 of the dark-field optical system and the slider S1 of the bright-field optical system does not necessarily have to be horizontal movement as long as the desired switching can be obtained. Need not move together. (Second Embodiment) FIG. 7 shows a schematic configuration of a second embodiment of the present invention, and the same parts as those in FIG. 2 are denoted by the same reference numerals.

In this case, in FIG. 7, the light source 1 described in FIG.
Fiber house 16 instead of lamp house LH
Are arranged on the same optical axis as the convex lens 4. Then, the light emitted from the light emission port 16a of the fiber 16 passes through the convex lens 4, and thereafter, the sample 14 is illuminated in the bright field with the same optical path as described in FIG. In the dark field illumination, the bright / dark field optical system switching knob L shown in FIGS.
This is performed by switching the slider S2 to the slider S1 by the insertion / removal operation of 2.

With this configuration, since the light is emitted in a substantially horizontal direction using the fiber 16 as a light source, an optical system corresponding to the diameter of the light emission port 16a of the fiber 16 is formed. be able to. Thereby, by adopting the fiber 16 having a small diameter of the emission port 16a,
The height from the upper surface of the sample mounting transparent member 13 to the bottom surface of the transmission illumination mount SK can be reduced.

Therefore, by using the fiber 16 having a small fiber diameter, the height from the sample mounting transparent member 13 to the bottom surface of the transmission illumination base SK can be reduced.
In the inspection of a sample, the observation of a living cell, the work, and the like, it is possible to realize a transmission illumination mount that reduces a load on an observer for manipulating the sample.

The insertion position and the insertion direction of the fiber 16 need not always be the same position and direction. For example, the fiber 16 may be inserted substantially vertically downward into the same position as the lamp house LH in FIG. Is also good. (Third Embodiment) FIGS. 8 to 13 show a third embodiment of the present invention.
It shows a schematic configuration of the embodiment of the present invention, these drawings,
The same parts as those in FIG. 2 are denoted by the same reference numerals.

In this case, the light path of the bright / dark field optical system is switched by operating a dial E3 and a knob L3 shown on a transmission illumination base SK as shown in FIG.
The dial E3 is rotatable about a rotation axis J3. The rotating shaft J3 has a rod shape, and timing belts B1 and B2 are provided at both ends thereof as shown in FIG.

A rotatable disk E1 is connected to the timing belt B1 via a rotation shaft J1.
This disk E1 is provided with a diffusion member 6 and a circular light shielding plate 15 via a connecting rod 17 as shown in FIG. In this case, when the circular light-shielding plate 15 is positioned on the optical axis as shown in FIG. 8 by rotating the dial E3, the diffusion member 6 is positioned on the optical axis. When the diffusion member 6 is located on the optical axis as shown in FIG. 10, the circular light shielding plate 15 is designed to be off the optical axis.

A holder E2 is rotatably connected to the timing belt B2 via a rotation shaft J2. The diffusion member 12 is provided integrally with the holder E2, and when the diffusion member 6 is positioned on the optical axis as shown in FIG. 10 by rotating the dial E3, the diffusion member 12 is placed on the optical axis. Position.

On the other hand, the knob L3 has a reflecting member 10a.
Is provided. The reflecting member 10a is rotatable by rotating the knob L3. By adjusting the rotating state, the reflecting member 10a is moved from the dark field optical system shown in FIG.
Switching to the bright field optical system shown in FIG. The switching between the bright and dark fields by operating the knob L3 is automatically determined by a rotation stopping mechanism (not shown), but can be stopped at an arbitrary rotation position.

In such a configuration, when setting the dark-field optical system, first, the disk E1 is rotated via the timing belt B1 by operating the dial E3, and the circular light-shielding plate 15 is turned on as shown in FIG. While being positioned on the axis, the diffusion member 6 is removed from the optical axis, and at the same time, the holder E2 is rotated via the timing belt B2 to remove the diffusion member 12 from the optical axis. In addition, knob stick L3
By the operation described above, the reflection member 10a is set to the state shown in FIG.

By these operations, the dark-field optical system shown in FIG. 11 is set, and the same dark-field illumination as described in the first embodiment is performed. Next, switching from the dark-field optical system to the bright-field optical system is performed by rotating the dial E3 clockwise about the rotation axis J3. In this case, the rotation axis J1 connected by the timing belt B1 and the rotation axis J2 connected by the timing belt B2 also rotate clockwise, so that the circular light shielding plate 15 does not interfere with the light beam of the bright field illumination as shown in FIG. To a different position,
Conversely, the diffusion member 6 is inserted into the illumination optical path of the bright field optical system. Similarly, by the rotation of the rotation axis J2, the diffusion member 12 of the holder E2 is also inserted into the illumination optical path of the bright field optical system. In this case, the rotation ratio of the dial E3 to the rotation axes J1 and J2 is set such that each optical path can be switched with a minimum rotation. Switching between the bright and dark fields by operating the dial E3 is automatically determined by a rotation stop mechanism (not shown). Further, the reflection member 10a is set to the state shown in FIG. 12 by operating the knob L3.

By these operations, the bright-field optical system shown in FIG. 12 is set, and the same bright-field illumination as described in the first embodiment is performed. With such a configuration, the switching between the bright and dark fields is performed by rotating the dial E3 and rotating the knob L3, so that the horizontal movement of the optical system components is more than in the first embodiment. It becomes considerably shorter, and the lateral width of the gantry SK for transmitted illumination can be further reduced. In addition, since the knob L3 to which the reflecting member 10a is attached can be stopped from rotating at any position, if the reflecting member 10a is appropriately tilted during bright-field illumination, the knob L3 can pass through the convex lens 8 substantially horizontally. The optical axis of the direction is
Rather than being reflected vertically at the intersection point P2, the light is reflected with a slight inclination with respect to the vertical axis as shown in FIG. 13, whereby the sample 14 can be subjected to oblique illumination.

Therefore, since the width of the transmission illumination mount can be considerably reduced, the sample can be easily operated, the portability is convenient, and the mount space for the transmission illumination mount can be reduced. In addition, since oblique illumination can be performed by rotating the knob L3, a three-dimensional contrast can be easily obtained even for a transparent object that is difficult to observe.
This makes it very convenient for observation and operation when performing live cell observation, experiments using work, and the like.

The rotation axis J1, the rotation axis J2, and the rotation axis J3 do not always have to be at the positions shown in the figure, and can be switched as desired, and may be provided at any position where the horizontal width of the transmission illumination base can be reduced. It may be a position. In addition, these three
The member connecting the two shafts may be a gear instead of a timing belt.

[0040]

As described above, according to the present invention, the height from the top surface of the sample mounting surface to the bottom surface of the gantry for transmitted illumination can be reduced, so that sample inspection, live cell observation, manipulator In an experiment or the like using, the burden on the operator for manipulating the sample can be greatly reduced.

Further, since the width of the pedestal for transmitted illumination can be reduced, the sample can be easily manipulated, it is convenient to carry, and the space for the place can be reduced. In addition, since oblique illumination can be performed on the sample surface, it is easy to obtain three-dimensional contrast even for transparent objects that are difficult to observe, and when performing live cell observation, experiments using work, etc. In addition, observation and operation can be conveniently performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a stereo microscope to which a first embodiment of the present invention is applied;

FIG. 2 is a diagram illustrating a schematic configuration of a dark-field optical system according to the first embodiment.

FIG. 3 is a diagram illustrating a schematic configuration of a bright-field optical system according to the first embodiment.

FIG. 4 is a diagram showing a schematic configuration of a switching mechanism of the bright / dark field optical system according to the first embodiment.

FIG. 5 is a diagram showing a schematic configuration of a switching mechanism of the bright / dark field optical system according to the first embodiment.

FIG. 6 is a view for explaining the operation of the first embodiment.

FIG. 7 is a diagram showing a schematic configuration of a second embodiment of the present invention.

FIG. 8 is a diagram illustrating a schematic configuration of a switching unit of a bright / dark field optical system according to a third embodiment of the present invention.

FIG. 9 is a diagram illustrating a schematic configuration of a switching unit of a bright / dark field optical system according to a third embodiment.

FIG. 10 is a diagram illustrating a schematic configuration of a switching unit of a bright / dark field optical system according to a third embodiment.

FIG. 11 is a diagram illustrating a schematic configuration of a dark-field optical system according to a third embodiment.

FIG. 12 is a diagram illustrating a schematic configuration of a bright-field optical system according to a third embodiment.

FIG. 13 is a diagram illustrating a schematic configuration of another operation example of the third embodiment;

FIG. 14 is a diagram showing a schematic configuration of an example of a conventional stereomicroscope illumination device.

FIG. 15 is a diagram showing a schematic configuration of another example of a conventional stereomicroscope illumination device.

[Explanation of symbols]

 SK: Mount for transmitted illumination H: Bottom surface H ': Virtual bottom surface L2: Bright / dark field optical system switching knob F: Filter insertion / removal knob LH: Lamp house SH: Focusing handle S: Focusing part KB: Mirror T: Objective lens K: Eyepiece tube P1, P2 ... Intersection point S1, S2 ... Slider L1 ... Connecting member L2 ... Switching knob L3 ... Knob rod J1, J2, J3 ... Rotary axis B1, B2 ... Timing belt E1 ... Disk E2 ... Holder E3 ... Dial DESCRIPTION OF SYMBOLS 1 ... Light source 2 ... Collector lens 3 ... Reflection mirror 4 ... Convex lens 5 ... Tokuho 5a. 5b Filter 6 Diffusing member 7 Concave lens 8 Convex lens 9 Conical mirror 10a, 10b Reflecting member 11 Reflecting member 11a Inner peripheral surface 12 Diffusing member 12a Fresnel surface 12b Diffusing surface 13 Sample placement Transparent member 14 ... Sample 15 ... Circular light shielding plate 16 ... Fiber 16a ... Outlet 17 ... Connecting rod

Claims (3)

[Claims] 1. An illumination device for a stereomicroscope that irradiates illumination light from below a sample surface, a reflecting member disposed vertically below the sample surface, and an illumination optical system that causes illumination light from a light source to enter the reflecting member. And a conical mirror disposed vertically below the reflection member and reflecting the illumination light of the illumination optical system reflected by the reflection member to the sample surface side. An illumination device for a stereomicroscope, wherein a real image of the light source is formed as a virtual image vertically below the conical mirror via the reflecting member and the conical mirror. 2. A bright-field optical system having a diffuser plate for diffusing light from the light source, the bright-field optical system having a diffuser for diffusing light from the light source, and a light-field optical system disposed vertically below the sample surface. A circular light-shielding plate that partially shields light from the conical mirror; and a cylindrical reflecting member that is disposed between the sample surface and the circular light-shielding plate and reflects light from the conical mirror toward the sample surface. A dark-field optical system having: the reflecting member is capable of selectively switching illumination light from the light source incident from the illumination optical system to the conical mirror side or the sample surface side. The illumination device for a stereomicroscope according to claim 1, wherein: 3. The reflection member is provided rotatably,
3. The illumination device for a stereomicroscope according to claim 2, wherein the sample surface can be obliquely illuminated by illumination light from the light source incident from the illumination optical system.