JPH11258516A5 - - Google Patents

Description

In such a conventional stereomicroscope, an illumination device for illuminating an object coaxially with the observation axis is provided on the side opposite the object side of the half mirror 1 (above the half mirror 1 in the figure). A light beam from the object illuminated by this illumination device is reflected by the half mirror 1 and passes through the objective lens 2 to become an afocal light beam. This afocal light beam passes through a three-dimensional effect adjustment diaphragm 3 to suppress changes in the three-dimensional effect caused by magnification changes, and is then reflected by reflectors 4 and 6 to travel upward in the figure. After passing through an afocal zoom system 7 coaxial with the objective lens 2, located behind the reflector 6, it is split by a beam splitter 8. That is, the light beam emerging from the afocal zoom system 7 is reflected by the beam splitter 8 and then by a reflector 9 to travel downward in the figure. An object image is then formed by the first lens 10 of the relay system, which focuses the afocal light beam, and the light beam is then reflected by reflectors 11, 12, and 13 to travel upward in the figure along an extension of the incident optical axis from the object (the incident optical axis to the half mirror 1), becoming approximately parallel to the incident optical axis. This allows the object position to be closer to the observer's eye position, even when an optical system with a long optical path is used, and the eyepoint can be lowered, making it possible to use it in the same way as a normal stereo microscope. In this optical system, if a lens is placed near the image point of the relay system, it is easy to adjust the pupil position.

That is, for example, in an optical system configured as shown in FIG. 10 , a television imaging system is attached to the transmission side of the beam splitter 8, or, for example, to one of the left and right auxiliary observation-side lens barrels 21 shown in FIG. 1 . It is necessary to align the observation-side pupil with the aperture stop of the imaging system. To achieve this, in the present invention, an aperture stop is provided by forming an image once within the imaging system, and a conjugate position of the aperture stop is provided on the object side. To achieve this, the configuration shown in FIG. 5 is used to align the left and right optical path lengths . That is, to adjust the optical path length, a section is provided where the optical axes of both optical paths are parallel, and the optical path length is adjusted by moving a reflecting member located in this section where the optical axes are parallel. The optical path length is extended by twice the amount of this movement, allowing the optical path length to be adjusted without significant changes. In the configuration shown in FIG. 5 , this section extends from the incident optical axis of reflecting member 37L to the exit optical axis of reflecting member 38L in the left-eye optical path, and from the incident optical axis of reflecting member 36R to the exit optical axis of reflecting member 37R in the right-eye optical path. This allows adjustment while maintaining a compact size. Furthermore, if this configuration is adopted for both the left and right optical systems, the planes determined by the parallel optical axes will be perpendicular to each other, making it possible to arrange them in a small volume.

Claims (12)

a stereomicroscope comprising an objective lens system, a variable magnification optical system, and a lens-barrel optical system, wherein the optical axes of the objective lens system and the variable magnification optical system coincide and have at least one image point; the lens-barrel optical system comprising a pair of left and right aperture stops, an imaging lens, and an eyepiece; and wherein the left and right observation optical axes determined by the pair of aperture stops, respectively, pass through a point different from the optical axis of the variable magnification optical system, wherein the stereomicroscope is provided with a stereoscopic imaging system, and a stereoscopic image produced by the stereoscopic imaging system corresponds to the image observed by the lens-barrel optical system. a stereomicroscope comprising an objective lens system, a variable magnification optical system, and a lens-barrel optical system, the optical axes of which coincide with each other and have at least one image point, the lens-barrel optical system comprising a pair of left and right aperture stops, an imaging lens, and an eyepiece, and left and right observation optical axes determined by the left and right aperture stops, respectively, pass through a point different from the optical axis of the variable magnification optical system, the stereomicroscope comprising a stereoscopic imaging system having a pair of optical paths consisting of a first optical path and a second optical path, the stereoscopic imaging system having an imaging optical system that images a light beam once, and the aperture stop of the stereoscopic optical system approximately coincides with the aperture stop of the lens-barrel optical system. 2. The stereomicroscope according to claim 1, wherein the imaging direction of said stereoscopic imaging system is changed in accordance with a change in the observation direction of said lens barrel optical system. 4. The stereo microscope according to claim 3, wherein the magnification variable system comprises an afocal magnification variable system and a relay system, and at least one stereoscopic imaging system is disposed in a light beam split by a light splitting member disposed between the afocal magnification variable system and the single-imaging relay system. 5. The stereomicroscope according to claim 4, wherein an imaging device having another imaging system is provided in the light beam after exiting the single imaging relay system, and the imaging device is common to an imaging device having an imaging system in the light beam split by the light splitting member. 3. The stereomicroscope according to claim 2, wherein the first optical path and the second optical path each have an imaging optical system, the imaging optical systems are configured with the same lenses, and the stereoscopic imaging system is provided with a reflecting member for matching the direction and magnification of the image. 7. A stereomicroscope according to claim 6, wherein a lens is disposed between an aperture between an image forming point and an image plane within the stereoscopic imaging system and the image point, so that the imaging system is telecentric. 8. A stereomicroscope according to claim 7, wherein the number of reflections in the stereoscopic imaging system can be switched between an odd number and an even number. 3. The stereomicroscope according to claim 2, wherein the first optical path and the second optical path each have at least two reflecting surfaces, and a first optical axis incident on one of the reflecting surfaces is parallel to a second optical axis emerging from the reflecting surface. 10. The stereomicroscope according to claim 9, wherein a first plane including the first optical axis and the second optical axis in the first optical path and a second plane including the first optical axis and the second optical axis in the second optical path intersect with each other. 11. The stereomicroscope according to claim 10, wherein the first plane and the second plane are orthogonal to each other. 2. The stereomicroscope according to claim 1, further comprising a plurality of light splitting members each having a light splitting surface that splits the light beam from the variable magnification optical system into a transmitted light beam and a reflected light beam, the tube optical system being connected to one of the light splitting members, and the stereoscopic imaging system being connected to another light splitting member.