JPS6217722A - Single objective stereoscopic vision binocular microscope - Google Patents

Abstract

PURPOSE:To observe satisfactorily a stereoscopic image by interlocking a luminous flux split element to a variable power operation of an objective lens, and moving it to the vicinity of a projecting position of an exit pupil of the objective lens to be used. CONSTITUTION:In case an objective lens 4 is inserted into an optical path, a luminous flux split prism 6 is positioned in the vicinity of a projecting position A of an exit pupil of the objective lens 4, and light which is emitted from a light source 1 illuminates a sample through a condenser lens 5. Subsequently, its light is made incident on a reflecting surface 6a of the luminous flux split prism 6 which has reached the position A through the objective lens 4 and a relay lens 5, but in the light which has illuminated a sample 3, a right eye vision system luminous flux R of the ample 3 is reflected by a total reflecting surface 6a' of the reflecting surface 6a, and thereafter, forms an image through a prism 7', an image forming lens 8', and a prism 9', and an observation is executed through an eyepiece 10'. Also, in the light which has illuminated the sample 3, a left eye vision system luminous flux L of the sample 3 transmits through a total transmission surface 6a'' of the reflecting surface 6a, and thereafter, forms an image through a prism 7, an image forming lens 8, and a prism 9, and an observation is executed through an eyepiece 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-objective binocular stereoscopic W4 microscope that enables good observation of stereoscopic images using various objective lenses from low to high magnification.

In general, single-objective binocular microscopes can be replaced with a variety of objective lenses ranging from low to high magnification, but the exit pupil position of these objective lenses is slightly different for each lens for aberration correction reasons. I end up. For this reason, in the case of a single-objective binocular stereoscopic microscope in which the exit pupil of the objective lens is divided into two and guided to the corresponding left and right eyepiece systems to observe a three-dimensional image, the position where the light beam is divided into two is set at an appropriate magnification. Three-dimensional images have been observed in accordance with the exit pupil position of the objective lens or a position conjugate thereto. However, if the exit pupil position of the objective lens used or a position conjugate thereto is far away from the position where the light beam is divided into two, there is a problem in that the stereoscopic effect of the observed image deteriorates.

In view of the following points, the present invention aims to provide a single-objective binocular stereoscopic microscope capable of observing stereoscopic images favorably using various objective lenses from low to high magnification. To explain this by way of example, 1 is a light source, 2 is a condenser lens, 3 is a sample, and 4.4' is an objective lens with different magnifications, which can be selectively inserted into the optical path. 5 is a relay lens, objective lens 4.4'
The exit pupils of are projected onto positions A and B, respectively. Reference numeral 6 denotes a beam splitting prism which is movably arranged along the optical axis so as to be located near the projection position of the exit pupil depending on the objective lens 4 or 4 used, and is configured as shown in FIG. The reflecting surface 6a has a part 5a' on the left side of the optical axis as a total reflection surface in FIG. 1, and a part 6a'' on the right side as a total transmission surface. 7°7' is a relay prism; ' is an imaging lens, 9.9' is an interpupillary distance adjusting prism, and 10.to' is a beam splitting prism 6 when the direct objective lens 4 is inserted in the optical path, as shown in FIG. It is located near the projection position A of the exit pupil of the objective lens 4, and the light emitted from the light source 1 illuminates the sample 3 via the condenser lens 2, and the light that illuminated the sample 3 is transmitted to the objective lens 4 and the relay. It is incident on the reflective surface 6a of the beam splitting prism 6 that has reached position A via the lens 5, but among the light that illuminated the sample 3, the right eye visual system light beam R of the sample 3 is reflected by the total reflection surface 6a' of the reflective surface 6a. After being reflected by the prism 7', it is guided to the right eye viewing optical system, i.e., the prism 7'.
An image is formed through an imaging lens 8' and a prism 9', and is observed through an eyepiece 10'. Further, the left-eye visual system light flux of the sample 3, which is behind the light that illuminated the sample 3, passes through the total transmission surface 6a'' of the reflective surface 6a and is then guided to the left-eye visual system, that is, the prism 7, the imaging lens 8. An image is formed through the prism 9 and observed through the eyepiece 10.In this way, the light flux transmitted from the sample 3 to the left diagonally upward direction, that is, the light flux, is observed by the observer's left eye as the exit pupil 11. and sample 3
The light flux transmitted diagonally upward to the right, that is, the light flux R, is observed by the observer's right eye like an exit pupil 11', and a three-dimensional image of the sample can be observed.

Here, from the objective lens 4, an objective lens 4' with a different magnification is used.
When the objective lens 4' is inserted into the optical path, the beam splitting prism 6 is moved to the projection position of the exit pupil of the objective lens 4', preferably by means of a well-known interlocking means (not shown) in response to the switching operation of the objective lens. The light emitted from the light 'tA1 illuminates the sample 3 through the condenser lens 2, and the light that illuminates the sample 3 is transmitted to the objective lens 4' and It reaches position B via the relay lens 5 and enters the reflecting surface 6a of the beam splitting prism 6, and similarly to the case of the objective lens 4, the beam R is guided to the right-limited viewing optical system and the beam R is guided to the left-eye viewing optical system. Therefore, even when using the objective lens 4', a good stereoscopic image equivalent to that using the objective lens 4 can be observed.

FIG. 3 shows a second embodiment of the invention, where 12 is 6
A beam splitting prism consisting of a 0° prism and two relay prisms, the projection position f of the exit pupil of the objective lens 4 or 4'
The prism is movably disposed along the optical axis so that the apex angle of the 60" prism is located at iA or B. Therefore, in the case of this embodiment as well, it is compatible with objective lenses of 4.4" having different magnifications. A beam splitting prism 1 is placed near the projection position of the exit pupil.
2 is moved, and an equally good three-dimensional image can be observed using either objective lens 4.4'.

As described above, according to the present invention, the beam splitting prism is moved along the optical axis near the projection position of the exit pupil corresponding to the objective lenses with different magnifications used, so that the structure is simple. This has the effect that good stereoscopic images can always be observed using various objective lenses from low to high magnifications.

Although the above explanation deals with the case where two objective lenses with different magnifications are used selectively, the present invention is applied to a single-objective binocular stereoscopic microscope in which three or more objective lenses with different magnifications are used. This is also possible with a microscope that uses a zoom lens system to change the observation magnification. It goes without saying that other light beam splitting elements may be used instead of the light beam splitting prism to split the light beam.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of a single-objective binocular stereoscopic microscope according to the present invention, FIG. 2 is a perspective view of a beam splitting prism used in the embodiment of FIG. 1, and FIG. FIG. ■...Light source, 2...Condenser lens, 3.0
．． . Sample, 4.4'...Objective lens, 5...Relay lens, 6,12...Light beam splitting prism, 7.7'
... Relay prism, 8.8" ... Imaging lens, 9.9' ... Interpupillary distance adjustment prism, 10., 10
',. ...Eyepiece, 11.11'...Exit pupil. 11. 11' ■ 0

Claims (1)

[Claims] A single-objective binocular stereoscopic microscope that uses a beam splitting element placed near the projection position of the exit pupil of the objective lens to split the beam from the sample into two on both sides of the optical axis and guide them to the corresponding left and right eyepieces. A single-objective binocular stereoscopic microscope, characterized in that the beam splitting element is moved near the projection position of the exit pupil of the objective lens used in conjunction with the magnification changing operation of the objective lens.