JP2000314841A - Stereomicroscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereomicroscope, specially a microscope for surgical operation by which the other picture is displayed within a microscopic observation visual field at a required time and by a required display method without losing the brightness of a microscopic image. SOLUTION: An optical path synthetic means 5 having the transmissible band of a narrow band area is arranged in the optical path of a microscopic optical picture, and is provided with a reflection type picture display device 11 having the wavelength characteristic of a narrow band area substantially coinciding with the wavelength area of the transmissible band of the optical path synthetic means 5 in the means 5, so that the microscopic optical picture and a picture displayed by the picture display device 11 are enlarged and observed through the same eyepiece 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic microscope, and more particularly, to a method for simultaneously displaying other images such as an endoscopic image, a preoperative MRI / CT image and a nerve monitor waveform signal which are used at the same time in the same visual field. The present invention relates to a surgical microscope that is suitable for:

[0002]

2. Description of the Related Art Conventionally, surgical microscopes have been used for neurosurgery,
It is used in otolaryngology, ophthalmology, and other surgical operations, and provides an observer with an enlarged observation image of the operative site, and plays an important role in improving the efficiency of the operation. In recent years, in order to make surgery less invasive, endoscopic observation has been combined with surgery that was conventionally performed only under surgical microscope observation, and surgical microscope observation images and endoscopic observation images It is desired to be able to observe at the same time. There is also a demand for observing images such as preoperative MRI / CT images simultaneously with a microscope image.

[0003] Conventionally, as one that meets these requirements, for example, one disclosed in Japanese Patent Application Laid-Open No. Hei 10-333047 is known. FIG. 22 shows the entire configuration.
In this conventional example, the endoscope image transmitted by the prism P inserted into the field of view of the microscope and the optical image of the microscope can be simultaneously observed through the eyepiece IP of the microscope. In this case, a part of the microscope image is missing, and the endoscope image is displayed at the missing position. Hereinafter, this display state is referred to as “picture-in display”. FIG. 23 shows a state in which an endoscopic image, a preoperative image such as MRI, and a nerve monitor waveform are displayed side by side via the prism P. Further, in FIG. 24, other images such as an endoscope image displayed on the display device D are transmitted by the transmission optical system,
In addition to the picture-in display which can be observed through the eyepiece IP of the microscope simultaneously with the microscope image via the mirror M inserted into the microscope field of view, the nerve monitor waveform displayed on the display device D is superimposed on the microscope image via the half mirror HM. The image is shown. The nerve monitor waveform is synthesized using the half mirror HM so that even if the nerve monitor waveform is superimposed on the microscope image, image information of the microscope is hardly lost. Hereinafter, this multiple image display is referred to as “overlay display”.

[0004]

However, the conventional display method described above may not be able to adequately cope with an advanced operation, and may not satisfy the demand for ease of use. There is. That is, 1) A crosshair display for presenting the focus position to the operator in the microscope field of view is provided in the eyepiece, but this may hinder the operation during the operation, so that it is actually displayed or erased. 2) In advanced surgery using a navigation device together, it is desirable to display a tumor or the like with a marker in a microscope image, to indicate the observation direction of the microscope, or to use the endoscope together. We want to be able to inform the surgeon of the direction of the mirror, the direction of the treatment tool, etc. on the microscope image by arrows, etc., and when multiple images are displayed, the mutual relationship is displayed with a marker There is a need to be able to do that. These requirements can be met if the display is an overlay display, but in the above-described conventional overlay display method, the brightness of the microscope field of view is reduced because a half mirror is used. I can't.

[0005] 3) In microscopic surgery, while it is desired to obtain information of other images, it is desired to secure a microscope field of view for surgery as much as possible. In the above-mentioned conventional example (FIG. 23), three pieces of information are obtained by the same prism. Because of this, a display area for other images cannot be secured and sufficient information cannot be presented. Also, a half mirror H for the overlay display of FIG.
With the M and the mirror M for picture-in arranged side by side, it is not possible to switch between overlay display and picture-in display at the same place, and it is not possible to satisfy the requirement to secure the visual field of the microscope image as much as possible. Absent.
4) The nerve monitor waveform may be desired to be watched within the visual field of the microscope when necessary, but may be displayed at the periphery of the visual field of the microscope so as not to hinder the operation with the microscope. Character information, such as descriptions of various image displays, can be complicated when displayed in the visual field of the microscope and hinder microscopic observation.However, in the conventional technology, images can be displayed in a peripheral part outside the visual field of the microscope. There is no way. Hereinafter, displaying other images outside the microscope field of view around the eyepiece lens field of view is referred to as “sub-picture display”.
I will call it. 6) In the conventional example, since a transmission type liquid crystal display device is used as a display device for other images, the other images are darker than the microscope images and have poor color reproducibility. It uses transmissive diffused white illumination, has poor transmission efficiency to the eyepiece, and has a narrow color reproduction area such as white fluorescent light, so it is not suitable for reproducing the delicate color of the surgically affected area. .

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a stereoscopic microscope, particularly a surgical microscope, which can satisfy all of the above requirements. Is what you do. That is, it is possible to satisfy the display requirements that change with the progress of the operation, provide a display image that is easy for the operator to see with a display method that matches the characteristics of other images, and maintain the brightness of the microscope image required for the operation. An object of the present invention is to provide a surgical microscope capable of providing necessary other image information to an operator.

[0007]

Means for Solving the Problems To achieve the above object, a stereo microscope according to the present invention is a stereo microscope in which an optical image of the microscope and other images are observed through an eyepiece of the same microscope. Optical path combining means disposed in the optical path of the optical image, comprising an image display device having a narrow wavelength characteristic of a band capable of introducing the other image into the optical path of the optical image through the optical path combining means, The optical path combining means has a transmission wavelength range with a narrow band, and the wavelength range of the optical path combining means is substantially matched with the wavelength range of the display device.

A stereo microscope according to the present invention is a stereo microscope in which an optical image of the microscope and another image can be observed with the same eyepiece, wherein the optical image of the microscope is formed on the display surface of the reflective display element. It is characterized by having been constituted so that.

Further, the stereoscopic microscope according to the present invention is a stereoscopic microscope in which an optical image of the microscope and another image can be observed through an eyepiece of the same microscope, wherein the optical image is formed on a display surface thereof. And a light path combining means for introducing the other image into the optical path of the microscope optical system, the light path combining means having a narrow-band transmission wavelength characteristic, and The type display device has a narrow-band emission wavelength characteristic, and the wavelength band of the optical path combining means and the wavelength band of the reflection type display device substantially match.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the illustrated embodiments. In each embodiment, substantially the same members and portions are denoted by the same reference numerals, and redundant description thereof will be omitted. Embodiment 1 FIG. 1 is a sectional view showing a basic configuration of an optical system of an optical surgical microscope according to the present invention, FIG. 2 is a partial sectional view showing a modification of the optical system shown in FIG. 1, and FIG. FIG. 2 is a cross-sectional view of a main part of the first embodiment, which corresponds to a left side view of a portion surrounded by a broken line in FIG. 1. 1 and 2, 1 is an objective lens, 2 is a zoom lens, 3 is an imaging lens, 4 is an image rotator for erecting the direction of an image, 5 is an optical path synthesizing means, 6 is an eyepiece, and S is A specimen, I is an intermediate image (hereinafter, referred to as a microscope image) of the specimen S. In FIG.
8 is a light diffusing plate, 9 is a condensing lens, 10 is a polarizing beam splitter, 11 is a reflection type image display device having a characteristic capable of efficiently transmitting light source light to the pupil of the eyepiece 6, and 12 is a reflection type image. An imaging lens whose focal length is adjusted so that when the reflected light from the display device 11 is reflected by the polarization beam splitter 10 and the optical path combining means 5, an image is formed at a position substantially coincident with the image plane of the microscope image I. is there. FIG. 2 differs from FIG. 1 in that the zoom lens 2 is commonly used for the left eye and the right eye. The light source 7 includes three light emitting diodes which emit three types of light having a narrow wavelength band as shown in FIG. 4, namely, blue light, green light and red light, respectively.
The optical path synthesizing means 5 has three kinds of transmission bands having narrow bands as shown in FIG. 5, and exhibits a reflection characteristic in which the transmittance is attenuated at a portion corresponding to the emission wavelengths of the three colors of the light source 7. It is a composite mirror having. The reflection type image display device 11 has a narrow wavelength characteristic in substantially the same band as that of the optical path combining means 5.

Since the present embodiment is constructed as described above, the light from the sample S illuminated by a known illuminating device (not shown) receives the objective lens 1, the zoom lens 2, the imaging lens 3, and the image rotator. 4 and the optical path synthesizing means 5 to form an erected microscope image I, which is magnified and observed through an eyepiece 6. in this case,
Since the microscope image has a wide wavelength band, even if it is attenuated in a narrow band, the amount of light transmitted through the optical path synthesizing means 5 hardly decreases.
On the other hand, the color light emitted from the light source 7 is uniformly mixed by the light diffusing plate 9, condensed by the condenser lens 9, transmitted through the polarizing beam splitter 10, and reflected by the reflection type image display device 11.
Is irradiated. Thus, the illumination light applied to the reflection-type image display device 11 is subjected to brightness modulation, and then specularly reflected, reflected by the polarization beam splitter 10, transmitted through the imaging lens 12, and transmitted by the optical path combining unit 5. The light is reflected to form an image at a position substantially coincident with the image plane of the microscope image I.
The image (other image) thus displayed on the reflection type image display device 11 is magnified and observed together with the microscope I through the eyepiece 6 (see FIGS. 6A and 6B).

In this case, since the optical path synthesizing means 5 has the above-described characteristics, it is possible to synthesize the light from the reflection type image display device 11 having a narrow wavelength characteristic in the optical path of the microscope. In the optical path of the microscope, light in a narrow wavelength band is attenuated by the optical path combining means 5, but light other than the specific wavelength reaches the eyepiece 6. Therefore, the light amount of the microscope image I can be transmitted with little loss, and the light from the reflection type image display device 11 can be transmitted to the eyepiece 11 efficiently. Therefore, the observer can see an enlarged image of the bright microscope image and the bright other image displayed on the reflection type image display device in the same visual field.

The light source 7 is composed of a light emitting diode emitting blue light, a light emitting diode emitting green light, and a light emitting diode emitting red light. When the image is a color image, a color overlay image can be observed. It is needless to say that a monochromatic overlay image can be obtained if the light source 7 is formed of a single color. However, in any case, the light source 7 having high monochromaticity and the reflective display device 11 are used.
And the optical path synthesizing means 5 adapted to the wavelength of the light source, the overlay display can be performed without deteriorating the brightness of the microscope, and a much brighter display can be performed as compared with the conventional transmissive display device.

The characteristic of the optical path combining means 5 is that the transmittance is 0
% And a reflectance of 100%, the illumination light to the reflective display device 11 can be most efficiently coupled. However, actually, from the viewpoint that the color reproducibility of the microscope is not degraded and the light quantity loss is further reduced. The transmittance is preferably set to about 20% to 80%. The wavelength width is 50 nm in half width.
Hereinafter, if possible, 20 nm or less is preferable. This allows
Although the overlay display can be made as shown in FIG. 5, if the projection size of the reflection type image display device 11 on the microscope image plane is set larger than the microscope image I, the overlay display can be made as shown in FIG.
As shown in (a) and (b), display outside the field of view and display inside and outside the field of view can be realized with the same configuration.

Embodiment 2 FIG. 8 is a sectional view of a main part of a second embodiment of the present invention. In the figure,
The substantially same members as those in the first embodiment are denoted by the same reference numerals,
Detailed description is omitted. This embodiment is different from the first embodiment in that a picture-in display can be performed so as to be switchable from an overlay display. 13 is a collimator lens, 14 is a DMD (Digital Micromirror Devic).
e- Micro-mirrors (several tens of microns) arranged in a matrix to control brightness by controlling the tilt angle of each micro-mirror), 15 is a projection lens, 16 is a mirror, and 17 is a microscope image Only the portion 17a (FIG. 9) corresponding to a portion where another image is to be picture-in displayed when inserted into the optical path, is disposed at a position substantially coinciding with the image plane of I so as to be detachable from the optical path. Is shown in FIG.
10A has a transmittance characteristic (transmission band characteristic matched to the wavelength of the light source 7) as shown in FIG.
This is a wavelength limiting filter configured to have a transmittance of 100% as shown in (b). The light emission characteristics of the light source 7 and the transmittance characteristics of the optical path combining means 5 are the same as those in the first embodiment.

Since the present embodiment is constructed as described above, if the wavelength limiting filter 17 is pulled out of the optical path and the light source 7 is turned on, the light made uniform by the diffusion plate 8 is collimated by the collimator lens 13. To enter the DMD 14. The light source light reflected from the micro mirror of the DMD 14 controlled corresponding to the image to be displayed as an overlay is reflected by the mirror 16 and combined with the microscope optical path by the optical path combining means 5, and formed into the imaging lens 3 and the image rotator 4. The other images are formed together with the erected microscopic image I at a predetermined position via the camera, and these images are magnified by the eyepiece 6 and displayed as an overlay as shown in FIG. On the other hand, when the wavelength limiting filter 17 is inserted into the optical path, a part 17a of the filter 17 passes through D 17 of the image synthesized by the optical path synthesizing means 5.
The microscope image is cut off only by the image displayed on the MD 14, and a picture-in display of another image as illustrated in FIG. 11 can be made.

As described above, according to the present embodiment, there is provided a stereoscopic microscope in which the overlay display without darkening the optical image of the microscope and the picture-in display on the microscope image can be switched at the same position in the visual field. You can do it. Further, in this embodiment, since the wavelength limiting filter 17 is substantially arranged on the image plane, the boundary of the cut-off region of the microscope image is clearly displayed, and a very easy-to-see picture-in display can be realized. In addition, wavelength limiting filter 1
Since the size of the lens 7 is selected so as to cover the entire optical path of the microscope, the focus state in the field of view is constant regardless of the state of insertion and removal, and it is not difficult to see at the periphery of the field of view. In addition, if a plurality of wavelength limiting filters having different display areas can be continuously inserted into and removed from the optical path using, for example, a turret device, it is possible to display a picture-in image that is optimal for the surgical procedure. (See FIGS. 12A, 12B and 12C).

In the above embodiment, if the sizes of the reflection type image display device 11 and the DMD 14 and the display positions of other images are appropriately selected and placed, as shown in FIG. It is possible to provide a surgical microscope capable of displaying an image as a sub-picture and displaying additional information without losing information of the microscope. In addition, with such a configuration, it is possible to realize the display of an arrow or the like extending over the inside and outside of the visual field of the microscope (see FIG. 13). As the reflection type image display device 11, there is a reflection type liquid crystal display device. In particular, a ferroelectric liquid crystal is preferable because of its high response speed and good image quality. If another image is displayed as a warning,
The light emitting elements themselves may be arranged as display elements.

Embodiment 3 FIG. 14 is a sectional view of a main part of a third embodiment of the present invention. In the figure, members that are substantially the same as those in the above-described embodiment are given the same reference numerals, and detailed descriptions thereof are omitted. This embodiment is different from the second embodiment in that a DMD 14 as a reflection type display device is arranged on the imaging plane of the imaging lens 3. 18
Denotes a prism, and 19 denotes a mirror. A microscope image is formed on the DMD 14 via the optical path synthesizing means 5, the imaging lens 3, the image rotator 4, the prism 18 and the mirror 19, and emitted from the light source 7. The three colors of light are made uniform by the diffusion plate 8, then combined with the microscope optical path via the projection lens 15, the mirror 16 and the optical path combining means 5, and irradiated to the DMD 14. And DMD14
The blue, green, and red images are presented on the surface in accordance with the light emission timings of the three types of light emitting elements constituting the light source 7, and the enlarged images are provided together with the microscope image via the eyepiece 6.

According to this embodiment, since a microscope image and other images are formed on the display surface of the DMD 14, control of the display range and brightness of the microscope image, light distribution correction, and the like can be performed at high speed without mechanical driving. In addition to being able to overlay other images without darkening the microscope image, it is also possible to perform sub-picture display and overlay display or picture-in display at the same time, which is efficient for the operator. To provide an operating microscope capable of providing image information.

FIGS. 15A and 15B are views for explaining an example of the overlay display according to the present embodiment. In the case of the present embodiment, if the DMD 14 is set to a state of total reflection (on state) without turning on the light source 7 and observed, the result is as shown in FIG.
As shown in (a), only a normal microscope image appears in the visual field. In this state, if control is performed so that only the micro mirror corresponding to the other image to be displayed is not reflected (off state), the other image appears in the field of view as shown in FIG. Is performed. FIG. 16 (a),
(B) is a figure for explaining other examples of overlay display by this example. That is, FIG.
Same as (a), but if the light source 7 is turned on in this state, the on / off state of the DMD 14 is simultaneously switched so as to be opposite to the above case, so that the view in the field of view of FIG.
Only the other images as shown in FIG. Therefore, DMD1
If the switching of the on / off state of the light source 4 and the blinking of the light source 7 are synchronized and repeated at a high speed, an overlay display can be provided to the operator by the afterimage effect of the eyes.

FIGS. 17A, 17B and 17C are diagrams for explaining an example of picture-in display according to the present embodiment. In this embodiment, the DMD 14 is turned on without turning on the light source 7.
By turning off the portion to be displayed in picture-in and turning on the other portions, the image shown in FIG.
A partly missing microscope image as shown in FIG.
On the other hand, if the light source 7 is turned on and the part of the DMD 14 to be displayed in the picture-in state is turned on and the other parts are turned off, the other parts in the observation field of view as shown in FIG. Only images are displayed in picture-in. Therefore, if the state displayed in FIG. 17A and the state displayed in FIG. 17B are repeated at high speed, the image-in display as shown in FIG. Can be provided. As is clear from this description, the type, position, and size of another image to be displayed in a picture-in can be easily changed only by electrically controlling the DMD 14, and the switching involves mechanical vibration or the like. Therefore, a very convenient surgical microscope can be provided.

FIGS. 18A and 18B are diagrams for explaining an example of sub-picture-in display according to the present embodiment.
In this case, the size of the DMD 14 may be set to include a microscope image, and another image may be displayed around the visual field of the microscope image (see FIG. 18A). That is, DMD
Since the surface area 14 also serves as a microscope field mask, other images may be displayed in a peripheral portion larger than the image size of the microscope, and a relationship between the inside of the microscope field and other images outside the field of view (arrow display). ) Can be easily performed (see FIG. 18B).

FIGS. 19A and 19B are diagrams for explaining the various display patterns and the light emission pattern of the light source 7 according to this embodiment. Now, as shown in FIG. 19 (a), each light emitting diode constituting the light source 7 is set to emit light in the order of red, green, and blue and the cycle is repeated, and other images B and C are synchronized in synchronization with this cycle. , D are sequentially displayed, and the other parts B,
DMD corresponding to the microscope image while C and D are displayed
If the portion 14 is kept in the off state and turned on only when the microscope image is to be displayed, the other image B emits red light, the other image C emits green light, and the other image D Emits blue light, and the cycle in which the microscope image A is finally displayed is repeated (see FIG. 19 (b)). Therefore, if these recycles are repeated at a high speed, a display that is extremely easy to see and rich in discriminative power can be obtained. Can be provided. Actually, a laser diode or the like is used as the light source 7 in addition to the light emitting diode. In any case, a sufficiently bright afterimage can be obtained even if the light emitting time is extremely short. A sufficient microscope image can be obtained.

Embodiment 4 FIG. 20 is a sectional view of a main part of a fourth embodiment of the present invention. In the figure, members that are substantially the same as those in the above-described embodiment are given the same reference numerals, and detailed descriptions thereof are omitted. In this embodiment, the light from the light source 7 is directly synthesized into the optical path of the microscope via the optical path synthesizing means 5, and the synthesized light is applied to the reflection type image display device 11 via the polarizing beam splitter 10,
The third embodiment is different from the first embodiment in that the reflected light from the reflective image display device 11 is guided to the eyepiece 6 via the polarizing beam splitter 10. According to the present embodiment,
Although the amount of light of the microscope is reduced by half, it is possible to switch between overlay display, picture-in display, and sub-picture display without mechanical operation. FIG. 21 shows the state of the pupil of the microscope and the pupil of the display in the visual field.
By making the pupil of the display in the field of view larger than the pupil of the microscope,
In addition to being able to observe a brighter display in the visual field,
Even if there is an error in assembling the device, when the microscope image is visible, the display outside the field of view can always be seen.

In the various embodiments described above, the control of the brightness of the entire microscope image and the change of the brightness distribution in the visual field can be performed simultaneously and easily by controlling the reflection type display device such as DMD or reflection type liquid crystal. Can be done. In the above description, the stereomicroscope, particularly the operating microscope, is assumed, but this is merely an example, and therefore, the present invention is also applicable to binoculars and other microscopes and monocular visual observation optical systems. Needless to say.

As described above, the stereo microscope of the present invention has the following features in addition to the features described in the claims. (1) The stereoscopic microscope according to claim 1, wherein the image display device comprises a combination of a light source having a narrow emission wavelength band and a reflection type image display device.

(2) The optical path synthesizing means has red, green, and blue transmission bands, and the image display device has red, green, and blue transmission bands.
2. The stereomicroscope according to claim 1, wherein a color display composed of three blue colors can be performed, and wavelength bands of red, green, and blue of the optical path synthesizing unit and the image display device substantially coincide with each other.

(3) The stereoscopic microscope according to claim 1, further comprising a wavelength limiting filter arranged on an optical image plane of the microscope.

(4) The stereoscopic microscope according to (3), wherein the wavelength limiting filter is arranged so as to be insertable into and removable from an optical path.

(5) The stereoscopic microscope according to (4), wherein the display area of the other image changes in conjunction with the insertion and removal of the wavelength limiting filter.

(6) The optical path combining means has three narrow-band transmission characteristics, and the other image display device has three-color narrow-band emission characteristics. 4. The stereomicroscope according to claim 3, wherein the wavelength ranges substantially coincide with each other.

(7) The stereoscopic microscope according to (6), wherein the reflection type display device comprises a combination of a light source of three colors and a reflection type display element.

[0034]

As described above, according to the present invention, it is possible to provide a stereoscopic microscope capable of displaying an appropriate image in a visual field together with a microscope image according to its characteristics in a viewable manner. It is possible to provide a surgical microscope or the like suitable for advanced surgery that can satisfy display needs that change together.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a basic configuration of an optical system of an optical surgical microscope according to the present invention.

FIG. 2 is a partial cross-sectional view showing a modification of the optical system shown in FIG.

FIG. 3 is a sectional view of a main part of the first embodiment of the present invention.

FIG. 4 is a diagram showing light emission characteristics of a light source used in the first embodiment.

FIG. 5 is a line showing transmission characteristics of the optical path combining means used in the first embodiment.

FIGS. 6A and 6B are explanatory diagrams showing different display examples of a microscope image and other images.

FIGS. 7A and 7B are explanatory diagrams showing further different display examples of a microscope image and other images.

FIG. 8 is a sectional view of a main part of a second embodiment of the present invention.

FIG. 9 is a front view of a wavelength limiting filter used in a second embodiment.

10A and 10B are diagrams showing transmittance characteristics of a wavelength limiting filter, wherein FIG. 10A shows transmittance characteristics of another image display portion, and FIG. 10B shows transmittance characteristics of a microscope image portion.

FIG. 11 is an explanatory diagram showing an example of display of a microscope image and other images according to the second embodiment.

FIGS. 12A, 12B, and 12C are explanatory diagrams showing different display examples of other images according to the second embodiment.

FIG. 13 is an explanatory diagram showing still another display example of a microscope image and another image according to the second embodiment.

FIG. 14 is a sectional view of a main part of a third embodiment of the present invention.

FIGS. 15A and 15B are explanatory diagrams illustrating an example of a change in the display state of a microscope image and another image according to the third embodiment.

16A and 16B are explanatory diagrams showing another example of a change in the display state of a microscope image and another image according to the third embodiment.

FIGS. 17 (a), (b) and (c) are explanatory views showing still another example of a change in the display state of a microscope image and another image according to the third embodiment.

FIGS. 18A and 18B are explanatory diagrams showing still another example of a change in the display state of a microscope image and another image according to the third embodiment.

FIGS. 19A and 19B are explanatory diagrams showing the relationship between the lighting cycle of the light source and the other image display cycle by the reflective image display device in the embodiment of the present invention.

FIG. 20 is a sectional view of a main part of a fourth embodiment of the present invention.

FIG. 21 is an explanatory diagram showing a relationship between a pupil of a microscope and a pupil of display in a visual field according to a fourth embodiment.

FIG. 22 is a view showing a binocular tube portion in a conventional optical surgical microscope, (a) is an external perspective view, and (b) is a cross-sectional view.

FIG. 23 is an explanatory diagram showing an example of display of a microscope image and various other images by a conventional surgical microscope system.

FIG. 24 is an explanatory view showing another example of display of a microscope image and various other images by a conventional surgical microscope system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Objective lens 2 Zoom lens 3 and 12 Imaging lens 4 Image rotator 5 Optical path combining means 6 Eyepiece 7 Light source 8 Light diffusing plate 9 Condensing lens 10 Polarizing beam splitter 11 Reflective image display device 13 Collimator lens 14 DMD 15 Projection Lens 16, 19 Mirror 17 Wavelength limiting filter 18 Prism

Claims (3)

[Claims] 1. A stereomicroscope in which an optical image of a microscope and other images are observed through an eyepiece of the same microscope, wherein an optical path synthesizing means arranged in an optical path of the optical image and an optical path synthesizing means are provided. An image display device having a narrow wavelength characteristic of a band capable of introducing the other image into the optical path of the optical image through the optical path synthesizing means, wherein the optical path synthesizing unit has a narrow transmission wavelength band of the band, A stereo microscope wherein the wavelength range of the optical path synthesizing means substantially coincides with the wavelength range of the display device. 2. A stereo microscope in which an optical image of a microscope and another image can be observed with the same eyepiece, wherein the optical image of the microscope is formed on a display surface of a reflective display element. Characteristic stereo microscope. 3. A stereoscopic microscope in which an optical image of a microscope and other images can be observed through an eyepiece of the same microscope, wherein a reflection type optical image is arranged on a display surface thereof. A display device, comprising an optical path combining unit for introducing the other image into the optical path of the microscope optical system,
The optical path combining means has a narrow band transmission wavelength characteristic, the reflection type display device has a narrow band emission wavelength characteristic, and the optical path combining means and the reflection type display apparatus have substantially the same wavelength band. A stereo microscope characterized by the following: