JPS6239367Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an illumination device for an endoscope.

In endoscope technology, illumination light generated from a light source such as a xenon lamp is guided to a rigid distal end via a bendable light guide made of quartz or the like, and the object to be observed is illuminated from the light output end of the light guide. I am planning to do so. Then, the image of the object to be observed is sent to the rear handle by an image guide, and observed or photographed using an eyepiece, a camera, etc. provided on the handle.

Conventional illumination devices have a structure in which illumination light is emitted almost only forward from the light output end of the light guide via a diffusion lens provided at the rigid tip portion. For this reason, the illumination light hits only the front of the object to be observed, and therefore it is impossible to shade the object, making it impossible to create a three-dimensional effect such as unevenness in the photographed film.

Furthermore, since the structure is such that the illumination light is directly radiated onto the object to be observed, halation tends to occur easily, which sometimes causes problems in photographing.

The present invention was made in order to solve the above-mentioned problems, and its purpose is to obtain an illumination device that can cast shadows on an object to be observed to understand its three-dimensional shape and prevent halation. be.

In order to achieve the above-mentioned object, the present invention is characterized in that a reflective surface is installed opposite the tip of a light guide via a transparent resin body, and the light guide is freely movable in and out of the tip rigid portion.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an overall schematic explanatory diagram of an endoscope equipped with an illumination device according to the present invention, and FIG. 2 is an enlarged explanatory diagram of the main parts of FIG. 1, where 1 is a light guide, 2 is a light source, and 3 4 is an observation window, 4 is an image guide, 5 is an eyepiece, 6 is a transparent resin body, and 7 is a reflective surface.

Illumination light generated from a light source 2 such as a xenon lamp is guided to a rigid tip portion 8 through a light guide 1 made of bendable optical fibers such as quartz, and illuminates an object 9 to be observed.

The image of the observation object 9 reaches the image guide 4 from the observation window 3, and further advances to the eyepiece portion 5 of the handle portion 10.

At the tip of the light guide 1, an adhesive such as epoxy resin or a transparent resin body 6 such as acrylic resin is provided. Then, the tip of the transparent resin body 6 is drilled with a drill or the like to form a convex surface, and a reflective film such as Ag is coated thereon to form a reflective surface 7. Examples of the convex surface include a conical surface and a paraboloid.

In addition, the light guide 1 itself can be
It can be moved in and out by manual operation or the like, so that it can be brought close to the observation object 9 at will.

Next, to explain the operation of the above configuration, the illumination light guided by the light guide 1 is spread out in the radial direction of the transparent resin body 6 by the reflective surface 7 installed opposite to the tip of the light guide 1. be done. The illumination light spread out in this way illuminates the observation target 9 from the sides. Therefore, the observation object 9 is shaded in accordance with its unevenness and the like. Thereby, the three-dimensional shape of the observation target 9 can be known visually or by taking a photograph.

Further, unlike the case where the illumination light is directly irradiated onto the observation target 9, the illumination light can be softened by illuminating it from the side, so that halation can be prevented.

According to the above-mentioned endoscope illumination device according to the present invention, reflective surfaces are disposed opposite to each other at the tip of the light guide via a transparent resin body, and the light guide is made freely accessible from the rigid tip portion. Since the illumination light can be spread in the radial direction of the transparent resin body and illuminated from the side of the object to be observed, it is possible to shade the object to see its three-dimensional shape and prevent halation. It is something that can have a meaningful effect.

FIG. 3 is an enlarged explanatory diagram of main parts showing another embodiment, in which a reflector 12 made of stainless steel or the like having a convex reflective surface 7 is attached to a transparent resin body 6 at the tip of the light guide 1.
It was glued by.

In addition, in order to strengthen the bonding force between the light guide 1 and the reflector 12, as shown in FIG.
It is also possible to extend one end of the light guide 1 and fit it into the light guide 1.

With these configurations, substantially the same functions and effects as those of the above-described embodiments can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic explanatory diagram of an endoscope equipped with an illumination device according to the present invention, FIG. 2 is an enlarged explanatory diagram of the main part of FIG. 1, and FIG. 3 is a schematic diagram showing another embodiment. FIG. 4 is an enlarged explanatory diagram of a main part showing still another embodiment. 1... Light guide, 2... Light source, 4... Image guide, 6... Transparent resin body, 7... Reflective surface,
8...Tip rigid part, 9...Observation target, 11...Conducting hole, 12...Reflector.

Claims (1)

[Claims for Utility Model Registration] 1. In an endoscope illumination device that transmits illumination light from a light source to an observation object using a light guide made of bendable optical fibers, the tip of the light guide has a convex surface. An illumination device for an endoscope, characterized in that reflective surfaces are placed facing each other, and the light guide can be freely moved in and out from a rigid distal end portion. 2. The illumination device for an endoscope according to claim 1, wherein reflective surfaces are disposed opposite to each other at the tip of the light guide via a transparent resin body. 3. The illumination device for an endoscope according to claim 2, wherein the transparent resin body is made of adhesive. 4. The illumination for an endoscope according to claim 2 or 3 of the utility model registration, characterized in that a transparent resin body is perforated at its tip and a reflective surface is formed by coating the perforated surface with a reflective film. Device. 5. The illumination device for an endoscope according to claim 2 or 3, characterized in that a reflector having a reflective surface is adhered to the tip of the light guide using a transparent resin body. 6. The illumination device for an endoscope according to claim 5, characterized in that one end of the reflector is extended and fitted into the light guide.