JPS6161122A - stereo microscope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is mainly used in the medical field, and particularly relates to a stereomicroscope with a variable working distance.

[Prior Art] Stereo microscopes are widely used for medical purposes such as surgeries and examinations, as well as for research and industrial purposes, and are useful for improving precision and safety in surgeries.

In high-performance stereomicroscopes, it is desirable to have a variable working distance in order to accurately observe the subject. Conventionally, to achieve this, objective lenses with different focal lengths were removed and replaced. It was getting worse. However, with this method, it takes time and effort to replace L, and there is the inconvenience that the objective lens to be replaced must be prepared at hand.

[Object of the invention] The object of the present invention is to eliminate the drawbacks of such conventional devices,
It is an object of the present invention to provide a stereoscopic microscope that can easily obtain various working distances by freely combining the refractive powers of a plurality of objective lenses.

[Summary of the Invention] The gist of the present invention for achieving the above-mentioned objects is to provide a stereoscopic microscope in which a pair of left and right stereoscopic observation optical systems are arranged behind a common objective lens section, in which the objective lens section is An entity comprising a plurality of lenses stacked one on top of the other, at least one of the lenses having a portion from which refractive power is partially removed, and a light beam selectively passing through the portion. It's a microscope.

[Embodiments of the invention] The present invention will be explained in detail based on illustrated embodiments.

FIG. 1 shows an embodiment of the present invention, in which a subject O
a common objective lens l arranged superimposed in front of the
2 are provided rotatably around the optical axis C, and two apertures 1 are provided symmetrically about the optical axis C.
a, 1b and 2a, 2b. Behind these objective lenses 1.2, zoom lens systems 3a and 3b are arranged in pairs on the left and right optical axes Oa and Ob, respectively.
The subject O is viewed stereoscopically by the examiner through the relay lenses 4a, 4b, the prism optical systems 5a, 5b that change the baseline interval, and the eyepieces 6a, 6b arranged on the optical axes Oa'', Ob°. It has come to be observed, i.e.
The light beam emitted from the object 0 passes through the apertures 1a and lb of the objective lens 1, for example, is refracted by the objective lens 2, enters the zoom lens systems 3a and 3b, passes through the relay lenses 4a and 4b, and enters the prism optical systems 5a and 5b. The light is reflected by the eyepiece and reaches the examiner's eye via the eyepiece lenses 6a and 6b.

The combination of objective lenses 1.2 at this time is IV in Fig. 1.
Figure 2 shows the view from the -W line direction, and the objective lens 2
The apertures 2a, 2b of the objective lens l are deviated from the optical axes Oa, Ob, and the apertures 1a, lb of the objective lens l are aligned with the optical axes Oa, Ob. In this state, the aperture 1a of the objective lens l,
Since lb and the apertures 2a and 2b of the objective lens 2 do not overlap, the light flux passes through the apertures 1a and 1b of the objective lens 1,
It is refracted only by the refractive power of the objective lens 2 without being affected by the objective lens l. That is, in this state, it is possible to obtain exactly the same working distance as when the objective lens 2 is arranged alone.

In Fig. 3, objective lens l and objective lens 2 are rotated around the optical axis C as shown in Fig. 4, and the light beam emitted from 0', which is a different position from the object O, is 1 and passes through the apertures 2a and 2b of the objective lens 2, and then follows a path similar to that shown in FIG. 1, allowing the examiner to view the object 0' stereoscopically. In this case, the light is refracted only by the refractive power of the objective lens 1 without being affected by the objective lens 2. By arranging the objective lens 2 having the apertures 2a and 2b and the objective lens l in an overlapping manner in this manner, the same working distance as in the case where only the objective lens 1 is arranged is obtained.

Furthermore, in FIG. 5, the apertures 1a and 2a, lb and 2b of objective lens l and objective lens 2 are overlapped to form optical axes Oa and Ob.
In this case, the light beam is refracted by both objective lens l and objective lens 2, so a working distance different from that obtained when objective lens l or objective lens 2 are used alone is obtained. .

In addition, in FIG. 5, the apertures la and 2a of both objective lenses l and 2 are
, lb, and 2b are made to match, but they do not necessarily have to be made to match, and it is sufficient that the refractive powers of the objective lenses 1 and 2 are present in the portion through which the light flux passes.

In the above-mentioned embodiment, the objective lens section is composed of two lenses, but the objective lens section may be composed of a combination of three or more lenses. In this way, if the number of lenses in the objective lens section is increased, the number of combinations of apertures and parts with refractive power will also increase accordingly, making it possible to obtain the same effect as when replacing many objective lenses. It is possible. In addition, 2
Even if two objective lenses are used, an aperture may be provided in only one objective lens.

Furthermore, an auxiliary stereoscopic observation optical system and a light flux passage section for it may be added at a position rotated 90 degrees from the current position of the stereoscopic observation optical system. In this case, each objective lens has four objective lenses. Apertures are required, and by combining them, a common refractive power, that is, a working distance can be obtained simultaneously in the two systems of stereoscopic observation optical systems.

In addition, in the above embodiment, the case where an aperture is provided in the objective lens has been explained, but this means that the refractive power of this part is not used. It is also possible to obtain the same effect by

[Effect of the invention 1 As explained above, in the stereomicroscope according to the present invention, the objective lens section is composed of a plurality of lenses that partially have no refractive power, and the refractive power of each objective lens is used in combination. This makes it possible to easily obtain various working distances without the need to replace the objective lens, and to achieve accurate observation that matches the intended use.

[Brief explanation of drawings]

The drawings show an embodiment of the stereomicroscope according to the present invention, and FIG. 1 is an optical configuration diagram, FIG. 2 is a front view of the objective lens seen from the line ■-■ in FIG. 1, and FIG. Fig. 1 is an optical configuration diagram with the objective lens position changed, Fig. 4 is a front view of the objective lens seen from the objective lens line IV-IV in Fig. 3, and Fig. 5 is a diagram of another objective lens. It is an explanatory diagram of a combination. Symbols l and 2 are objective lenses, la, 1b, 2a and 2b are apertures, 3a and 3b are zoom lens systems, 4a and 4b are relay lenses, 5a and 5b are prism optical systems, and 6a and 6b are eyepiece lenses.

Claims (1)

[Scope of Claims] 1. In a stereoscopic microscope in which a pair of left and right stereoscopic observation optical systems are arranged behind a common objective lens section, the objective lens section is constructed by overlapping a plurality of lenses, and the lens A stereoscopic microscope characterized in that at least one of the microscopes has a part from which refractive power is partially removed, and a light beam is selectively passed through the part. 2. The stereoscopic microscope according to claim 1, wherein the position of the portion from which the refractive power is removed can be changed. 3. The stereoscopic microscope according to claim 2, wherein the means for changing the position is performed by rotating the lens. 4. The stereoscopic microscope according to claim 1, wherein the portion from which the refractive power is removed is an aperture provided in the lens.