JPH09159932A - Stereoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain a transmitted image with a stereoscopic effect by positionally deviating the edges of objective lenses attached to one-side ends of image fibers constituting a pair of transmission systems. SOLUTION: This stereoscope is provided with the image fibers 10 and 12 constituting a pair of image transmission systems for right and left eyes. It is alto provided with the objective lenses 20 and 22 attached to the edges of the image fibers 10 and 12, and the edge of the lens 20 is positionally projected relatively further than the lens 22. The difference of the degree of the relative projection is the difference of the size of the obtained image, and the difference of 5 to 20%, desirably about 10%, is set. By such constitution, even when a distance between the edge of the rod lens and an observed subject is long, the images which are different in size by 5 to 20%, desirably about 10%, are formed on right and left eyes, and the observed subject is viewed with the stereoscopic effect.

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 observation image, as shown in FIG. 2, in order to obtain a parallax S, two objective systems of an image transmission system are arranged in parallel to each other. The transmission system has a space. That is, in FIG. 2, reference numerals 1 and 1 denote a pair of image fibers for image transmission, and usually both have the same number of pixels and the diameters of the image transmitting portions are also the same. 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 denote eyepieces for the right and left eyes attached to the other ends of the pair of image fibers 1 and 1, respectively. Further, as another means for obtaining the parallax S, as shown in FIG. 3 (the same portions as those in FIG. 2 are denoted by the same reference numerals), 2
There is a method of arranging the transmission system of the system at an angle and a spacing according to the working distance.

[0003]

In the configuration of FIG. 2, when the distance from the scope tip (rod lens tip) to the observation object is short, the parallax S becomes relatively large, but a perspective is obtained. As the distance increases, the parallax S decreases and it becomes difficult to obtain a 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 having a pair of image fibers having an objective lens attached and an eyepiece lens attached at the other end, the positions of the tips of both objective lenses are relatively displaced. 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 relative displacement of the positions of the tips of both objective lenses is preferably such that the difference in image size is 5 to 20%. The reason is that if it is less than 5%, the stereoscopic effect is insufficient, and if the difference in image size exceeds 20%, an unnatural image results and it is difficult to obtain a stereoscopic effect. This is based on the finding that about 10% is more preferable as a practical difference that can be processed without feeling discomfort or fatigue.

[0005]

Embodiments of the present invention will be described below. FIG. 1 is a conceptual view of a stereoscope of the present invention. In FIG. 1, reference numerals 10 and 12 are image fibers constituting a pair of image transmission systems for the right eye and the left eye, which are made of, for example, quartz glass. The number of pixels is equal to 1600 to 500
00, and the outer diameter is typically 0.1 to 0.8
mm. 20 and 22 are image fibers 10,
The objective lens 20 is attached to the front end of the objective lens 12, and the position of the front end of the objective lens 20 is relatively projected from that of the objective lens 22. This relative difference in the degree of protrusion is a difference in the size of the obtained images and is set to 5 to 20%, preferably about 10%. Reference numerals 30 and 32 are eyepieces having a magnification of about 50. With such a configuration, even if the distance between the tip of the rod lens and the observation object is large, images of different sizes are formed in the right and left eyes by 5 to 20%, preferably about 10%. This means that you can see the object with a three-dimensional effect.

[0006]

[Example] The number of pixels is 6,000, the strip length is 2 m, and the outer diameter is 3
Prepare two 50 μm silica-based image fibers, one end of which has a diameter of 0.7 mm, a working distance of 5 mm, and an angle of view of 65.
The objective lens is attached with an adhesive such as an epoxy resin. Then, the positions of the tips of the pair of objective lenses were shifted back and forth so that the relative difference was 0.5 mm. It should be noted that eyepieces having a magnification of 50 were attached to the other ends of the pair of image fibers to form a stereoscope. When the stereoscopic effect of the obtained transmission image was examined by changing the distance to the observation object, it was found that the stereoscopic effect was sufficiently obtained even in a relatively distant region (for example, 10 mm). By the way, with the conventional structure, it is difficult to obtain a stereoscopic effect when the distance to the observed object is 7 mm.

[0007]

As described above, according to the present invention, a transmission image having a stereoscopic effect can be easily obtained only by shifting the position of the tip of the objective lens attached to one end of the image fiber forming the pair of transmission systems. The effect that it can be obtained can be produced.

[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]

 10 Relatively long image fiber 12 Relatively short image fiber 20 Objective lens with a relatively protruding tip 22 Objective lens with a relatively retracted tip

Claims (2)

[Claims] 1. In a stereoscope having a pair of image fibers having an objective lens attached to one end and an eyepiece lens attached to the other end, the positions of the tips of both objective lenses are relatively displaced. A stereoscope featuring. 2. The stereoscope according to claim 1, wherein the displacement of the positions of the ends of both objective lenses is set to be 5 to 20% depending on the difference in the number of pixels.