JP3072930B2 - Stereo microscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereo microscope in which an observation direction can be changed.

[0002]

2. Description of the Related Art In general, a stereo microscope is mounted on a fixed column, and when the observer changes the observation direction, the entire mirror of the stereo microscope is moved with respect to the column. As a stereomicroscope that changes the observation direction frequently,
There is an operating microscope. The following is an example of a surgical microscope.
The prior art will be described.

FIG. 16 shows a general configuration of an optical system of a surgical microscope used for performing plastic surgery and orthopedic surgery. 1 is an operator, 2 is an assistant, 3 is an operation part, 4 is an objective lens, 5 is a variable power lens, 6 is an opposed intermediate lens barrel, 7,
7 'is an eyepiece tube for an operator, an eyepiece tube for an assistant,
8 'is an optical axis corresponding to the left eye and the right eye, respectively. As shown in the figure, those having an opposing intermediate lens barrel 6, an eyepiece tube 7 for the operator, and an eyepiece tube 7 'for the assistant, in which the operator 1 and the assistant 2 face each other and can observe the operation part 3, are often used. I have.
In such an operating microscope, the eyepiece tube 7 for the operator and the eyepiece tube 7 ′ for the assistant are fixed to the opposed intermediate lens tube 6. FIG. 17 is a diagram of FIG. 16 viewed from the lateral direction. Normally, as shown in FIG.

[0004] On the other hand, when performing an operation on the neck or the like using the above-mentioned microscope, the entire mirror body is often used while being tilted left and right, as shown in FIG. At this time, surgeon 1
The assistant 2 tilts his / her head to the left and right, and when the operation is performed for a long time, the assistant 2 becomes extremely tired. As means for solving this drawback, Japanese Patent Application Laid-Open No. 64-88513 proposes a configuration shown in FIG. This is so that the operator's eyepiece tube 7 and the assistant's eyepiece tube 7 ′ are rotated about the center axis 9 of the left and right optical axes 8 and 8 ′ with respect to the inclined opposite type intermediate lens tube 6. It was done. In other words, the eyepiece tube 7 for the operator and the eyepiece tube 7 'for the assistant, which are fixed to the opposed-type intermediate lens tube 6, have a simple structure in which the eyepiece tube 7' can be simply rotated about the shaft 9 as a rotation axis. This is a suitable configuration when the rotation angle is small.

[0005]

However, simply rotating the eyepiece tube as described above has several problems. The problem will be described with reference to FIG. However,
In FIG. 20, the optical members are omitted, and only the left and right optical axes, the object and its image, and the pupils of the left and right optical systems are illustrated. The x-axis is a direction parallel to a plane including the left and right optical axes 8, 8 'and perpendicular to the left and right optical axes 8, 8', and the y-axis is a coordinate axis perpendicular to the x-axis and taken on the object plane. . In FIG. 20A, the exit pupils 10, 10 'of the intermediate lens barrel and the entrance pupils 11, 11' of the eyepiece barrel.
And the observer's pupils 14, 14 '
8 '. The surgeon 1 observes the images 13 and 13 ′ of the object 12 stereoscopically.

Now, it is assumed that the mirror body is changed from a state where the mirror body is vertical as shown in FIG. 20 (b) to a state where the mirror body is inclined as shown in FIG. 20 (c). Then, as described above, the operator takes an unreasonable posture of tilting his head for observation. Then, as shown in FIG. 20D, the eyepiece tube is rotated around the axis 9 so that both eyes of the operator are horizontal. At this time,
Since the images 13 and 13 'are tilted by the same angle as the tilt angle of the mirror body, the appearance does not match the case where the object is directly observed without using the microscope. When the rotation angle is further increased, the exit pupils 10, 10 'of the intermediate lens barrel and the entrance pupils 11, 1 of the eyepiece tube are provided.
1 ', the luminous flux emitted from the intermediate lens barrel is blurred, and observation becomes impossible.

Further, there is a problem of abnormal stereoscopic effect. FIG.
When the exit pupils 10, 10 'of the intermediate lens barrel and the entrance pupils 11, 11' of the eyepiece tube are shifted as shown in FIG. 0 (e), the luminous flux entering the pupils 14, 14 'of the observer is shown in FIG. Hatching part 1
The light beam passes through 6, 16 '. Therefore, the position of the pupil 14, 14 'of the observer changes from the position on the left and right optical axes 8, 8' of the intermediate lens barrel to the position 15, 15 'substantially at the center of the hatched portions 16, 16'. On the other hand, the direction of the parallax, which is one of the factors of the stereoscopic effect, is a direction connecting the left and right conjugate positions of the pupil of the observer's eye at the object-side entrance pupil. Therefore, as shown in FIG. 20E, when the direction connecting the pupil of the observer is deviated from the direction connecting the centers of the exit pupils 10 and 10 'of the intermediate lens barrel, not only the left and right (x-axis direction) but also the up and down Since a parallax is also generated (in the y-axis direction), a stereoscopic image different from that when the object is directly viewed is observed. If the surgeon keeps observing for a long time in the presence of such abnormal stereoscopic effect, eye fatigue, headache, etc. will occur, which will make the operation work difficult.

The present invention has been made in view of the above circumstances, and even if a part of the mirror body is moved so as to be easily observed, the brightness of an image is reduced.
It is an object of the present invention to provide a stereoscopic microscope with less image blur and abnormal stereoscopic effect.

[0009]

A stereo microscope according to the present invention comprises:
An objective optical system for emitting a light beam from said object along two optical axes intersect at a predetermined inward angle on the object, zooming
A lens system, and an eyepiece optical system having a pair of left and right eyepieces each receiving a light beam emitted from the variable power lens system, and a straight line connecting two optical axes emitted from the objective optical system and the two eyepieces in the stereomicroscope and the straight line connecting the optical axes are relatively movable in the objective optical system and the eyepiece optical system to be taken a state crossing, the Henbaire
A light beam moving member between the lens system and the eyepiece,
The angle between the straight line connecting the two optical axes after emitting the light beam moving member and the straight line connecting the optical axes of the two eyepieces,
The relative movement between the objective optical system and the eyepiece optical system is smaller than the angle between the straight line connecting the two optical axes emitted from the objective optical system and the straight line connecting the optical axes of the two eyepieces. The light beam moving member is moved synchronously. Further, the stereoscopic microscope according to the present invention is characterized in that the light beam moving member is moved so that a pupil in front of the light beam moving member coincides with a pupil behind the light beam moving member. Further, the stereomicroscope according to the present invention is characterized in that the eyepiece optical system is rotated at an angle twice as large as that of the light beam moving member, with a center of two optical axes emitted from the objective optical system as a rotation axis. In the stereomicroscope according to the present invention, the light beam moving member is an image rotator. Further, in the stereomicroscope according to the present invention, the eyepiece optical system is rotated about the center of the two optical axes emitted from the objective optical system as a rotation axis, and the light beam moves in parallel with the rotation of the eyepiece optical system. The light beam member is moved as described above.

[0010]

According to the stereoscopic microscope of the present invention constructed as described above, when the observer moves a part of the mirror body in order to keep a natural posture, the pupil in front of the light beam moving member and the pupil in the back are moved. The pupil, in the above-described example, corrects or reduces the shift between the exit pupil of the intermediate lens barrel and the entrance pupil of the eyepiece tube, so that at least one of image blurring, image rotation, and abnormal stereoscopic effect is corrected. Alternatively, it can be alleviated.

[0011]

FIG. 1 is a diagram showing a first embodiment of the present invention.
1A is a front view, and FIG. 1B is a left side view. In the figure, reference numeral 4 denotes an objective lens common to the left and right optical systems for emitting a light beam from the object 3 as a parallel light beam. Reference numerals 5, 5 'denote a pair of left and right afocal variable power lens systems which are arranged so that their respective optical axes 8, 8' intersect on the object 3 via the objective lens 4 with a predetermined inward angle. In addition, an objective optical system 19 is configured together with the objective lens 4.

A light beam moving unit 17 is provided behind the objective optical system 19 (on the exit side). An image rotator 18 composed of a Schmidt prism common to the left and right optical systems is internally provided as a light beam moving member. Left and right optical axes 8, 8 '
(Corresponding to the central axis 9 of the above). Behind the light beam moving unit 17, image forming lenses 27 and 27 'for forming object images at image positions 30 and 30', image erecting porro prisms 28 and 28 ', parallelogram prism for bending the optical path. 29, 29 'and eyepieces 31, 31'
An eyepiece tube 7 including an eyepiece optical system 20 composed of

The observer has a pair of right and left eyepieces 31 and 3.
The object 3 can be viewed as a real object along the left and right optical axes 8, 8 'through 1'. Now, in order to change the observation direction, the objective optical system 19 or the eyepiece optical system 20 is moved to the left and right optical axes 8,
Suppose that it rotates around the central axis 9 of 8 '. Then,
A shift occurs between the exit pupil of the objective optical system 19 and the entrance pupil of the eyepiece optical system 20, and when the rotation angle is large, a part of the field of view is blurred and observation cannot be performed. Since the central axis 9 is a rotation axis, it may be referred to as a rotation axis in the following description.

On the other hand, when the image rotator 18 is rotated around the central axis 9, the light beam emitted from the image rotator 18 also rotates around the central axis 9, but the rotation angle of the light beam is two times the rotation angle of the image rotator 18. It is twice. Therefore, the displacement between the exit pupil of the objective optical system 19 and the entrance pupil of the eyepiece optical system 20 is corrected by rotating the image rotator 18 in synchronization with the rotation of the objective optical system 19 or the eyepiece optical system 20. Can be. Also, if the image rotator 18 is sufficiently large, the 360 ° viewing direction can be changed without causing any jolt.
In this case, the light beam moving unit 17, that is, the image rotator 18 may be arranged in an afocal light beam or in a non-afocal light beam.

FIG. 2 is a diagram showing the configuration of the optical system of the second embodiment. In the second embodiment, the surgeon 1 and the assistant 2 can observe the operation section 3 facing each other, similarly to the conventional example. In the figure, lens 21 and lens 2
5 is a relay lens system constituting an afocal optical system,
Reference numeral 22 denotes a beam splitter that splits a light beam between the operator side and the assistant side, 23 and 24 denote mirrors, and 26 denotes a light beam moving member, which is disposed so as to be rotatable around a central axis 9 (not shown in FIG. 2). It is an image rotator consisting of a dove prism. The roof prism 28 is used as an image erecting optical element of the eyepiece tube 7 for the surgeon and the eyepiece tube 7 'for the assistant. It should be noted that the opposing intermediate barrel 6 and the eyepiece barrel 7 for the operator,
Except for the dove prism 26, there are two optical elements included in the assistant's eyepiece tube 7 'for the left and right optical systems, one of which is not shown.

The light beam emitted from the operation section 3 is
After that, the light becomes a parallel light beam and enters the afocal variable power lens 5. The parallel light beam emitted from the afocal variable power lens 5 enters the opposed intermediate lens barrel 6, passes through the lens 21, and is split by the beam splitter 22 into two pairs of right and left light beams. Then, the two pairs of left and right light beams are deflected in opposite directions by mirrors 23 and 24, respectively, pass through the lens 25, become parallel light beams again, and after passing through the dove prism 26, the eyepiece for the operator Cylinder 7,
The light enters the assistant's eyepiece tube 7 '. The parallel luminous flux incident on the operator's eyepiece tube 7 and the assistant's eyepiece tube 7 ′ is converged by the lens 27, deflected by the roof prism 28 and the parallelogram prism 29, and forms an image at the image point 30. . Then, the surgeon 1 and the assistant 2 observe the images 13 and 13 ′ in an enlarged manner through the eyepiece 31.

FIG. 3 is a simplified version of FIG. 2 for explaining the second embodiment. FIG. 3A shows that the exit pupils 10 and 10 ′ of the light beam moving unit, the entrance pupils 11 and 11 ′ of the eyepiece tube and the pupils 14 and 14 ′ of the observer (operator) eye are respectively left and right optical axes 8 and 8 '. The surgeon has the object 1
The two images 13, 13 'are observed in a stereoscopic manner.

[0018] Now, a microscope body, if the inclination state shown in FIG. 3 (c) from a vertical state of FIG. 3 (b), the operator, as described above, to take unnatural posture to observe tilting the head become.
Then, the eyepiece tube is rotated around the central axis 9 so that both eyes of the operator are horizontal. At this time, when the dove prism 26 is rotated around the central axis 9 in the same direction by half the rotation angle of the eyepiece tube at the same time as the rotation of the eyepiece tube, as shown in FIG. Exit pupil 10, 10 '
And the entrance pupils 11 and 11 'of the eyepiece tube completely match without any shift. Therefore, the field of view due to rotation does not occur.

The orientations of the images 13 and 13 ' are the same as those before tilting the mirror body (FIG. 3B), and coincide with the case where the object is directly observed without using a microscope. Furthermore, since the positions of the pupils 14, 14 'of the observer's eyes do not deviate from the positions on the left and right optical axes 8, 8', there is no change in the stereoscopic effect. Even if the rotation angles of the eyepiece tube and the dove prism 26 increase, these results remain unchanged. In the second embodiment, the light beam moving member, that is, the dove prism 26, has two refraction surfaces inclined with respect to the left and right optical axes 8, 8 ', and if arranged in a convergent light beam, astigmatism will occur in the image. Must be placed in the beam. The dove prism 26
May be divided and provided separately for the left and right optical systems.

FIG. 4 shows the configuration of the optical system before and after the light beam moving section in the third embodiment. In the third embodiment, instead of the dove prism 26, a Schmidt prism 26 " is used as an image rotator as a light beam moving member in the relay lens system, that is, the lens 21 and the lens 25.
It is located between. Since the Schmidt prism 26 " does not have a refracting surface inclined with respect to the left and right optical axes 8, 8 ', it can be arranged in a converged light beam. Note that the lens 25 behind the Schmidt prism 26 " rotates by the same angle as the eyepiece tube 7.

FIG. 5 shows the configuration of the optical system in the intermediate lens barrel 6 including the light beam moving section in the fourth embodiment.
In the fourth embodiment, a lens 25 is disposed in front of a mirror 24, and a pair of left and right mirrors on the operator's side are synchronized with rotation of the operator's eyepiece tube 7 and assistant's eyepiece tube 7 '. 24,
24 ′ and a pair of left and right dove prisms 26, 26 ′, or a pair of left and right mirrors 24, 24 ′ and a pair of left and right dove prisms 26, 26 ′ on the assistant side,
The right and left sides are parallelly moved in directions opposite to each other along the optical axis of the light incident on the 4, 24 '.

FIG. 6 is an explanatory diagram relating to the arrangement of the pupil and the image when the mirror body is tilted in the fourth embodiment. The entrance pupils 11, 11 'of the eyepiece tube are rotated around the central axis 9 by the inclination angle θ of the mirror so that the observer (operator) can observe both eyes horizontally. With the movement of the mirror and the dove prism, the exit pupils 10, 10 'of the light beam moving section
Moves in a tilt direction of the mirror body (a direction tilted at an angle θ from the Z axis). If the distance between the rotation axis 9 and the left and right optical axes 8, 8 'of the eyepiece tube is L, the movement amount is

L sin θ

## EQU1 ## Then, the exit pupils 10, 10 'of the light beam moving unit after the movement are changed to the exit pupils 10, 1 of the light beam moving unit.
It is located at a position where the overlapping area between 0 'and the entrance pupils 11, 11' of the eyepiece tube is maximized. Also, at this time, the center of the exit pupils 10, 10 'of the light beam moving unit and the entrance pupils 11, 1 of the eyepiece tube.
The deviation δ from the center of 1 ′ is

Δ = L−Lcos θ

The exit pupils 10, 10 'of the light beam moving section
Is fixed and the deviation δ 'when only the eyepiece tube is rotated

Δ '= 2L sin (θ / 2)

Smaller than Therefore, in the fourth embodiment, as compared with the case where the eyepiece tube is simply rotated, the range in which the shaking occurs is small, and accordingly, the range of the observable tilt angle θ of the mirror body is enlarged, and the same tilt angle is obtained. At θ, a brighter image can be observed, and there is little change in the stereoscopic effect. However, in the fourth embodiment, since the image is rotated and the optical path length between the lens 25 and the eyepiece barrels 7 and 7 'is changed by the movement, the light beam moving member, that is, the mirror and the Dove prism are used. , Must be arranged in a parallel beam.

FIG. 7 shows the optical system in the intermediate lens barrel 6 including the light beam moving section in the fifth embodiment. In the fifth embodiment, instead of the lenses 21 and 25, an imaging optical system 32 composed of two positive lenses is used as a relay lens system provided in the intermediate lens barrel 6, and two parallel light beams are used. This is a configuration in which an image is formed once between lenses, and then a parallel light flux is emitted again. Then, the imaging type optical system 32 of the afocal optical system is synchronized with the rotation of the surgeon's eyepiece tube and the assistant's eyepiece tube 7 and 7 ', and is rotated by half of the rotation angle. , Around the rotation axis 9.

FIG. 8 is an explanatory diagram relating to the arrangement of the pupil and the image when the mirror body is tilted in the fifth embodiment. The entrance pupils 11, 11 'of the eyepiece tube are rotated about the rotation axis 9 by the tilt angle θ of the mirror so that the observer (operator) can observe with both eyes horizontal. The entrance pupil 3 of the light beam moving unit
4, 34 'and the exit pupil 10, 10' are rotated about the rotation axis 9 by an angle of [theta] / 2. 33, 33 'are exit pupils of the afocal variable power lens system 5.

FIG. 9 is an explanatory diagram relating to the pupil and the light beam in FIG. As shown in FIG. 9, the light beam emitted from the exit pupil 33 of the afocal variable power lens system 5 is incident on the entrance pupil 3 of the light beam moving unit.
After being restricted by 4, the light exits from the exit pupil 10 of the light beam moving unit. At this time, the light beam emitted from the exit pupil 10 of the light beam moving unit is shifted from the light beam incident on the entrance pupil 34 of the light beam moving unit to a position symmetrical with respect to the optical axis of the imaging type afocal optical system 32. Therefore, in the fifth embodiment, as compared with the case where the eyepiece tube is simply rotated, the range in which the shaking occurs is small, and accordingly, the range of the observable tilt angle θ of the mirror body is enlarged, and the same tilt angle is obtained. At θ, a brighter image can be observed, and there is little change in the stereoscopic effect. In addition, if an aspheric lens is used for the imaging type afocal optical system 32,
Deterioration of aberration at the time of decentering can be corrected. However, there is also image rotation in the fifth embodiment.

As the light beam moving member, in addition to the above, FIG.
A known image rotator shown in FIG. In each image rotator of FIG.
Since 2 , 5, and 6 have refraction surfaces inclined with respect to the incident optical axis or the exit optical axis, it is desirable to provide them in a parallel light beam. Other image rotators may be provided in any of the parallel light beam and the convergent light beam. Also, 3, 4, 9
And 10 can be constructed and used in combination with mirrors.
In each of the above embodiments, the eyepiece barrel and the light beam moving member are moved with the center axis of the left and right optical systems as the rotation axis, but the position at which the center axes of the left and right optical systems are translated is also rotated. Can be an axis.

FIG. 11 is a modification of the fourth embodiment shown in FIGS. In the fourth embodiment, a pair of left and right mirrors 2
4, 24 'and a pair of left and right dove prisms 26, 26'
Are moved in parallel in opposite directions to each other along the optical axis incident on the mirrors 24 and 24 '[FIGS. 5, 6, and 11].
(A)]. FIG. 11 (b) shows the mirrors 24 and 24 'moved in parallel to the operator's side and the assistant's side in opposite directions. FIG. 14C shows the mirror 24,
24 'is moved parallel to each other in a direction perpendicular to the mirror surface. In these cases, the mirrors 24 and 24 'must be arranged in a parallel light beam for the same reason as in the fourth embodiment.

FIG. 12 is also a modification of the fourth embodiment shown in FIGS. The embodiment shown in FIG.
Reference numeral 4 'is fixed, and only the pair of left and right image rotators are moved in a direction perpendicular to the incident optical axis, so that the exit pupils 10, 10' of the image rotator are moved (see FIG. 5). The image rotator may be of any type. In the embodiment shown in FIG. 12, the dove prisms 35 and 35 'are used as image rotators.

FIG. 13 shows a configuration in which parallel plane plates 39 and 39 'are arranged in the left and right optical paths as light beam moving members, and the parallel plane plates 39 and 39' are rotated around an axis perpendicular to the optical axis. . In this case, the plane-parallel plate must be arranged in the parallel light beam.

FIG. 14 shows a pair of wedge prisms provided in the left and right optical paths as a light beam moving member, and one wedge prism is moved in the optical axis direction with respect to the other wedge prism. It is a thing. Also in this case, the wedge prism must be arranged in the parallel light beam. Until now, an opposed stereo microscope having an opposed intermediate lens barrel has been described as an example, but the present invention is not limited to the opposed stereo microscope. Further, the present invention is not limited to the movement of the eyepiece tube, and any part of the mirror body may move. The light beam moving member may be a detachable unit as needed.

FIG. 15 shows a plurality of embodiments in which a mirror is used as a light beam moving member. In FIG. 15A, a pair of left and right light beams traveling upward from below the paper surface are deflected horizontally rightward by a mirror 36. When the mirror 36 rotates around the rotation axis 9 as indicated by an arrow, the light beam deflected in the horizontal direction also rotates around the rotation axis 9. At this time, the pair of left and right light beams rotate around the axis 38. Therefore,
When the optical member disposed behind the mirror 36 rotates around the axis 38, the optical axis can be adjusted again if the mirror 36 rotates around the rotation axis 9 together with the rear optical member.

FIG. 15B shows an embodiment in which a large single mirror 36 containing left and right light beams is rotated. FIG.
(C) shows a pair of left and right mirrors 37 and 37 '
This is an embodiment rotated around. In both examples,
Since the light beam moving member, that is, the mirror 36 or the pair of left and right mirrors 37 and 37 'does not change the optical path length between the lenses before and after the mirror with the movement, it can be arranged in either the parallel light beam or the convergent light beam.

[0039]

As described above, the stereoscopic microscope of the present invention can reduce the brightness of an image, blur the image, and cause an abnormal stereoscopic effect even when a part of the mirror is moved for easy observation. Can be reduced. Therefore, it is a very effective surgical microscope especially for long-time surgery.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an optical system in a first embodiment of a stereo microscope according to the present invention.

FIG. 2 is a configuration diagram of an optical system in a second embodiment of the stereo microscope according to the present invention.

FIG. 3 is an explanatory diagram of an operation in a second embodiment of the stereo microscope according to the present invention.

FIG. 4 is a configuration diagram of an optical system before and after a light beam moving unit in a third embodiment of the stereo microscope according to the present invention.

FIG. 5 is a configuration diagram of an optical system in an intermediate lens barrel including a light beam moving unit in a stereoscopic microscope according to a fourth embodiment of the present invention.

FIG. 6 is an explanatory diagram of an operation in a fourth embodiment of the stereo microscope according to the present invention.

FIG. 7 is a configuration diagram of an optical system in an intermediate lens barrel including a light beam moving unit in a fifth embodiment of the stereo microscope according to the present invention.

FIG. 8 is an explanatory diagram of an operation in a fifth embodiment of the stereo microscope according to the present invention.

FIG. 9 is an explanatory diagram relating to a pupil and a light beam in FIG. 8;

FIG. 10 is an illustration of a known image rotator that can be used as a light beam moving member in the stereo microscope of the present invention.

FIG. 11 is an exemplary view of a light beam moving member in a fourth embodiment of the stereo microscope according to the present invention.

FIG. 12 is an exemplary view of a light beam moving member in a fourth embodiment of the stereo microscope according to the present invention.

FIG. 13 is an exemplary view of a light beam moving member in the stereo microscope of the present invention.

FIG. 14 is an exemplary view of a light beam moving member in the stereo microscope of the present invention.

FIG. 15 is an exemplary view of a light beam moving member in the stereo microscope of the present invention.

FIG. 16 is an explanatory diagram of a general configuration of an optical system of a stereo microscope.

FIG. 17 is a view of FIG. 16 as viewed from the lateral direction.

FIG. 18 is an explanatory diagram of a usage example of a stereomicroscope.

FIG. 19 is an explanatory diagram of a stereomicroscope according to the related art.

FIG. 20 is an explanatory diagram of a problem of a stereomicroscope according to the related art.

[Explanation of symbols]

 Reference Signs List 17 light beam moving unit 18 image rotator (light beam moving member) 19 objective optical system 20 eyepiece optical system 31 eyepiece 31 'eyepiece

──────────────────────────────────────────────────続 き Continuing on the front page (72) Takashi Fukaya 2-43-2 Hatagaya, Shibuya-ku, Tokyo O-limpus Optical Industry Co., Ltd. (72) Asaki Ishikawa 2-43-2 Hatagaya, Shibuya-ku, Tokyo No. Ohlympus Optical Industry Co., Ltd. (72) Inventor Toyohiro Kondo 2-43-2 Hatagaya, Shibuya-ku, Tokyo In-Olympus Optical Industry Co., Ltd. (72) Inventor Toyoji Harisawa 2-43, Hatagaya, Shibuya-ku, Tokyo No. 2 Inside Olympus Optical Co., Ltd. (72) Kazuo Kajiya 2-43-2 Hatagaya, Shibuya-ku, Tokyo In-house Olympus Optical Co., Ltd. Yoichi Iba 2-43 Hatagaya 2-43, Shibuya-ku, Tokyo No. 2 Inside Olympus Optical Co., Ltd. (56) References JP-A-56-144410 (JP, A) JP-A-62-158413 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B 21/00 G02B 21/06-21/36 A61B 19/00

Claims (5)

(57) [Claims] 1. An objective optical system for emitting a light beam from an object along two optical axes intersecting at a predetermined inward angle on the object, a variable power lens system, and a light beam emitted from the variable power lens system. An eyepiece optical system having a pair of left and right eyepieces respectively receiving the eyepieces, and taking a state in which a straight line connecting two optical axes emitted from the objective optical system intersects a straight line connecting the optical axes of the two eyepieces. in obtaining as objective optical system and the eyepiece optical system and relatively movable in the stereomicroscope, to place the light beam moving member between said variable power lens system and the eyepiece, the light bundle moving member Angle between the straight line connecting the two optical axes after emitting the light and the straight line connecting the optical axes of the two eyepieces,
The relative movement between the objective optical system and the eyepiece optical system is smaller than the angle between the straight line connecting the two optical axes emitted from the objective optical system and the straight line connecting the optical axes of the two eyepieces. A stereo microscope wherein the light beam moving member is moved synchronously. 2. A pupil in front of and behind a luminous flux moving member.
Moving the light beam moving member so that
The stereomicroscope according to claim 1, wherein 3. Two optical axes emitted from the objective optical system.
Twice the angle of the light beam moving member with the center of rotation as the rotation axis
3. The eyepiece optical system is rotated by (1).
The stereomicroscope according to 1. 4. The image beam rotator according to claim 1, wherein the light beam moving member is an image rotator.
The stereo microscope according to claim 3, wherein: 5. Two optical axes emitted from the objective optical system
When the eyepiece optical system is rotated about the center of rotation as a rotation axis,
The light beam moves in parallel with the rotation of the eyepiece optical system.
Moving the light beam member so as to perform
Item 3. A stereomicroscope according to item 1.