JPH09146015A - Stereoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain an image with a stereoscopic feeling by obtaining such constitution that the combination magnification of a pair of eyepieces are different. SOLUTION: This stereoscope is provided with a pair of image fibers constituted by fitting an objective lens 2 to one end and fitting the eyepieces 30 and 32 to the other end, and the combination magnification of a pair of eyepieces 30 and 32 is mutually different. That means, the combination magnification of the eyepiece 30 for the right eye is about 10-100 and that of the eyepiece 32 for the left eye is about 11-110, for example. Besides, the difference of the combination magnification between them is 5-10%, preferably, about 10%. Since the difference of the combination magnification between the eyepices 30 and 32 is 5-20%, more preferably, about 10% when the stereoscope is constituted in such a way, the images whose size is different as much as the above mentioned difference are formed on the left eye and the right eye even when a distance between the tip of a rod lens and an object to be observed is apart. As the result, an object to be observed can be viewed with the stereoscopic feeling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscope used in the medical field and the like, and more particularly to a stereoscope for stereoscopically viewing an observation image.

[0002]

2. Description of the Related Art In a stereoscope, which is an endoscope for stereoscopically observing an observed image, as shown in FIG. 2, two objective systems of image transmission systems are arranged in parallel in order to obtain parallax. The system has a space. That is, in the figure, 1 and 1 are a pair of image fibers for image transmission,
Usually, both pixels have the same number of pixels, and the image transmission portion has the same diameter. Reference numerals 2 and 2 are objective lenses that form an objective part attached to one end of the pair of image fibers 1 and 1 and are usually rod lenses, which are parallel to each other to obtain a parallax S and have a predetermined interval. It is said that.
Reference numerals 3 and 3 are eyepieces attached to the other ends of the pair of image fibers 1 and 1. Further, as another means for obtaining the parallax S, as shown in FIG. 3 (the same parts as those in FIG. 2 are denoted by the same reference numerals), the angles and intervals are set to match the working distances of the two transmission systems. There is a way to place it.

[0003]

In the configuration of FIG. 2, when the distance from the distal end of the scope (the distal end of the rod lens) to the observation object is short, the parallax S becomes relatively large, but a sense of perspective is obtained. , As the distance increases, the parallax S
Becomes smaller and it becomes harder to obtain perspective. Therefore, in order to obtain a perspective in a wide range, it is necessary to make the distance between the image transmission systems, that is, the distance between the rod lenses 2 and 2 as large as possible, which is disadvantageous in terms of downsizing of the scope. In the configuration of FIG. 3, the most natural image perspective is obtained at the design working distance, and some perspective is obtained even in the area close to the design working distance, but an unnatural image is obtained in the far area. As a result, there is a problem that the range in which perspective is obtained is limited.

[0004]

SUMMARY OF THE INVENTION The present inventors
As a result of research, the present invention has been achieved by focusing on the fact that a person feels a stereoscopic effect from the displacement of images obtained by the left eye and the right eye, respectively. The invention according to claim 1, characterized in that In a stereoscope including a pair of image fibers to which an objective lens is attached and an eyepiece lens is attached to the other end, the coupling magnification of the pair of eyepiece lenses is different. Thus, there is a difference in the size of the images formed on the left and right eyes, which produces the effect of turning the face diagonally to the object to be observed, resulting in a stereoscopic effect on the observed object. Is emphasized. The reason why the difference in coupling magnification between the pair of eyepieces is set to 5 to 20% is that if the difference in coupling magnification is less than 5%, it is also related to the distance to the observed object, but it is insufficient for obtaining a stereoscopic effect. 20% difference in magnification
If it exceeds the limit, it will cause extreme fatigue for long-term use, and the difference in magnification that can be processed without feeling discomfort as a human sense is mainly 10%, 5-20%.
It is determined from the knowledge that the range is preferable.

[0005]

Embodiments of the present invention will be described below. FIG. 1 is a conceptual diagram of a stereoscope according to the present invention. Except for an eyepiece, the same parts as those in FIGS. In FIG. 1, reference numeral 30 denotes an eyepiece lens for the right eye, which has a coupling magnification of 10 to 10
Approximately 0, 32 is an eyepiece for the left eye, and the coupling magnification is 11 to 11.
At about 110, the difference in binding magnification between the two is 5 to 20%, preferably about 10%. With this configuration, even if the distance between the tip of the rod lens and the observation object is large, the difference in coupling magnification between the left and right eyes of the eyepieces is 5 to 20.
%, And more preferably about 10%, images having different sizes are formed by the difference, and the observed object can be viewed with a stereoscopic effect.

EXAMPLE A pair of silica-based image fibers having a pixel number of 6,000, an image transmission part diameter of 350 μm, and a strip length of 2 m were prepared.
A rod lens having a diameter of 0.7 mm and a working distance of 5 mm was bonded to one end of these with an epoxy or polyimide resin adhesive. On the other hand, an eyepiece having a coupling magnification of 50 for the right eye and a coupling magnification of 55 for the left eye (difference in coupling magnification of both = 10%) was attached to the other ends of both image fibers to form a stereoscope. When the stereoscopic effect of the obtained transmission image was examined by changing the distance to the observed object, the stereoscopic effect was sufficiently obtained even in a relatively distant region (10 mm).
By the way, with the conventional structure, the distance to the observation object is 7 m.
At m, it was difficult to obtain a three-dimensional effect.

[0007]

As described above, the present invention has an effect that a transmission image having a stereoscopic effect can be easily obtained only by the simple means of changing the magnification of the pair of left and right eyepieces.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a stereoscope of the present invention.

FIG. 2 is a conceptual diagram of a conventional stereoscope.

FIG. 3 is a conceptual diagram of another example of a conventional stereoscope.

[Explanation of symbols]

 1 Image Fiber 2 Objective Lens 3 Eyepiece 30 Small Eyepiece Lens 32 Large Eyepiece Lens

Claims (2)

[Claims] 1. A stereoscope comprising a pair of image fibers having an objective lens attached to one end and an eyepiece attached to the other end, wherein the pair of eyepieces have different coupling magnifications. Stereoscope. 2. The combination magnification of the pair of eyepieces is 5 to 20.
The stereoscope according to claim 1, wherein the stereoscope is%.