JPS6344814Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an endoscope in which an eyepiece is provided with a field frame plate that defines an observation field.

The eyepiece of the endoscope is provided with a field frame plate having a field defining frame in the center for defining the field of view for observation and photography at the end of the image guide fiber or at the imaging position of the relay lens system. It is being

Conventionally, the above-mentioned field frame board has a central part surrounded by a field-of-view defining frame formed as a light-transmitting part, and a peripheral part formed to block light, and the above-mentioned light-transmissive part covers the viewing range of the observer. It is formed smaller than. Therefore, when observing the transmitted image through the eyepiece lens in the eyepiece, most of the observer's field of view is pitch black;
You will see a small and highly bright transmitted image in this central part. Therefore, in the observer's retina, only a limited optic nerve near the fovea continues to be stimulated, and there is a large difference between the optic nerve and other nerves that are not stimulated, resulting in a problem of extremely severe eye fatigue. In other words, this phenomenon is the same as the eye strain caused by watching a highly bright TV monitor in a dark room.

This idea was made based on the above circumstances,
The purpose is to provide an endoscope that reduces the difference in brightness between the central part and the peripheral part of the field frame plate, allowing observation without causing eye fatigue. .

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the figure, 1 is the main body of the endoscope. The main body 1 includes an operating section 2, an insertion section 3 made of a flexible tube connected to the operating section 2, and an eyepiece section 4. An image guide fiber 5 and a first light guide fiber 6 are inserted into the insertion section 3. The image guide fiber 5 has an objective lens 7 whose distal end is provided at the distal end of the insertion section 3.
A holding cylinder 8a, which faces the cylinder body 8 and whose rear end protrudes into the center of the cylinder body 8 of the eyepiece part 4, is integral with the cylinder body 8.
is held by. Further, the first light guide fiber 6 has its distal end facing the distal end surface of the insertion section 3, and its rear end inserted into the universal cord 9 connected to the operating section 2. This universal cord 9 is connected to the light source lamp 1 via a connector 10.
1 is connected to a built-in light source device 12,
The end face of the first light guide fiber 6 faces the light source lamp 11. Therefore, since the illumination light from the light source lamp 11 is guided to the first light guide fiber 6 and illuminates the object 13 such as the inner wall of the body cavity, the reflected light from this object 13 is reflected by the image guide fiber 5. and is transmitted to the eyepiece section 4.

Further, a second light guide fiber 14 serving as illumination means is inserted through the universal cord 9. One end of this second light guide fiber 14 faces the light source lamp 11, and the other end is divided into a plurality of branches 14a...
It protrudes inward and is held by the holding cylinder 8a so as to surround the end of the image guide fiber 5 here.

A holder 16 holding an eyepiece lens 15 is slidably inserted into the cylindrical body 8 of the eyepiece section 4 . A guide pin 17 is provided on the outer peripheral surface of this holder 16.
The guide pin 17 is provided with an inclined guide hole 18 formed in the circumferential wall of the cylinder 8 along the axial direction and a circumferential wall of a cam cylinder 19 rotatably fitted on the outside of the cylinder 8. The cam hole 20 is inserted into a cam hole 20 that is drilled in the same manner. A diopter adjustment ring 21 is fixed to the cam cylinder 19. Therefore, when the cam barrel 19 is rotated through the diopter adjustment ring 21, the guide pin 17 moves up and down along the cam hole 20, and the holder 16 moves in conjunction with this to adjust the focal position of the eyepiece 15. It is now possible to adjust the

Further, a field frame plate 22 is disposed in the eyepiece section 4 so as to face the end surfaces of the branches 14a of the image guide fiber 5 and the second light guide fiber 14 that protrude into the cylindrical body 8. That is, the field frame plate 22 is provided with its peripheral edge fixed to the upper end surface of the holding tube 8a. This field frame board 22 is
As shown in FIG. 2, the central portion of the image guide fiber 5 facing the end surface is surrounded by an opaque field-of-view defining frame 23 with a minute width that defines the frame of the output light emitted from this end surface, that is, the transmitted image. The peripheral portion facing the end face of the branch 14a of the second light guide fiber 14 is formed as a semi-transparent portion 25. Therefore, the field frame plate 22 has a translucent part 25 that is connected to the light source lamp 11 guided by the second light guide fiber 14.
It is now illuminated by light. Note that when the semi-transparent part 25 is illuminated, the semi-transparent part 25 is designed to prevent the illumination light from directly entering the eyepiece 15 and causing flare, which would interfere with the observation of the transmitted image. The image guide fiber 5 is formed to have a rough surface so as to scatter the light, and to prevent the illumination light from entering the image output end face of the image guide fiber 5 and reducing the contrast of the transmitted image.
The end of the light guide fiber 14 is optically shielded from the end of the second light guide fiber 14 by a light shielding ring 26 .

Note that the transparent portion 24 formed on the viewing frame plate 22 is
A hole may be made in the field frame plate 22 as in this embodiment, or if the field frame plate 22 is made of a transparent material, it is sufficient to surround it with the field defining frame 23. In this case, the periphery of the viewing frame plate 22 is painted with a light color to create a translucent part 22.
You can set it to 5.

In the endoscope configured as described above, when the light source lamp 11 of the light source device 12 is turned on, illumination light enters the first light guide fiber 6 and the second light guide fiber 14, and the object 13 and the field of view frame are illuminated. The semi-transparent part 25 of the plate 22 is illuminated, and the subject 1
3 enters the image guide fiber 5 via the objective lens 7. Therefore, when an observer looks through the eyepiece lens 15 of the eyepiece section 4, within the field of view, the field-of-view defining frame 2 is located in the translucent section 24 located at the center of the semi-transparent section 25 illuminated with low brightness.
3, a high-intensity transmitted image clearly defined by a black frame can be observed. In other words, since the semi-transparent part 25 of the field frame plate 22 is illuminated, the difference in brightness from the transparent part 24 is reduced, so the observer can see that only a part of the optic nerve on the retina of the eye is strongly illuminated. There will be no irritation, and eye fatigue will be reduced.

Next, other embodiments of the present invention shown in FIGS. 3 to 5 will be described. Figure 3 is the second version of this invention.
In this embodiment, the holding tube 8a holding the end of the image guide 5 is made into a bottomed shape, and a plurality of illumination lamps 27 are arranged at the inner bottom of the holding tube 8a, and the illumination lamps 27 are used to control the viewing frame plate. The translucent portion 25 of 22 is illuminated. In addition, the lead wires 28 connected to the lighting lamps 27 are connected to the universal cord 9.
is led to the power supply device 12 through which it is connected to a power source. Even in such a configuration, the first
Similar to the embodiment described above, observation can be performed with less eye fatigue.

FIG. 4 shows a third embodiment of the present invention, which is applied to a rigid endoscope. That is,
A transmitted image is guided from the subject 13 to the eyepiece 4 by a relay lens 29. The eyepiece section 4 has a double-tube structure including an inner tube 30 and an outer tube 31, and a field frame plate 22 is provided at the imaging position of the relay lens 29 with its peripheral edge fixed to the inner tube 30. It is being Further, the holder 16 holding the eyepiece 15 is fixed to the inner cylinder 30, and one end facing the field frame plate 22 is formed into a light shielding part 32 which is widened into a skirt shape.
Illumination lamps 27 are arranged around the holder 16 so as to be shielded from light by the light shielding portion 32. Therefore, the illumination light from the illumination lamps 27 is reflected on the inner peripheral surface of the inner cylinder 30 and then illuminates the semi-transparent part 25 of the viewing frame plate 22. That is, compared to the first and second embodiments, the direction in which the semi-transparent portion 25 is illuminated is reversed, and the illumination is indirect, but even in this configuration, eye fatigue of the observer is reduced. Fewer observations can be made.

FIG. 5 shows a fourth embodiment of the present invention, which is applied to a rigid endoscope like the third embodiment shown in FIG. The illumination means of the frame plate 22 is different. That is, in this embodiment, the visual field frame plate 22 is formed of an electroluminescent panel that exhibits a luminescent phenomenon, and by applying a voltage to the visual field frame plate 22 through the lead wire 28, the peripheral area of the visual field frame plate 22 is illuminated. 25' is emitted and illuminated, and even in such a configuration, the same effects as in each of the above embodiments can be obtained.
In this embodiment as well, the field frame plate 2 is designed to prevent the light emitted from the peripheral portion 25' of the field frame plate 22 from directly entering the eyepiece 15 and causing flare.
The surface of No. 2 is roughened.

As described above, according to the present invention, since the periphery of the field frame plate having the field-of-view defining frame in the center is illuminated, the transmission image guided within the field-of-view defining frame and the peripheral part are illuminated. The difference in brightness can be made smaller than before. Therefore, since the observer does not experience strong stimulation of only a part of the optic nerve on the retina of the eye, the eye fatigue during observation is reduced.

[Brief explanation of the drawing]

Fig. 1 is an overall cross-sectional view showing the first embodiment of the present invention, Fig. 2 is a plan view of the field frame plate, and Fig. 3 is a cross-section of the eyepiece portion showing the second embodiment of the present invention. figure,
FIG. 4 is a sectional view of an eyepiece showing a third embodiment of the invention, and FIG. 5 is a sectional view of an eyepiece showing a fourth embodiment of the invention. 4... Eyepiece section, 14... Second light guide fiber (illumination means), 22... Field frame plate, 23...
...Visual field defining frame, 25, 25'... Peripheral part (semi-transparent part) of the visual field frame plate, 27... Illumination lamp (illumination means).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An endoscope in which the eyepiece is provided with a field frame plate having a field defining frame for defining the field of view in the center; An endoscope characterized by being provided with illumination means for illuminating the peripheral area. (2) Registration of a utility model in which the field frame plate has a semi-transparent peripheral area, and this peripheral area is illuminated by illumination means from the side opposite to the eyepiece provided in the eyepiece. The endoscope according to claim 1. (3) Claim 1 of the utility model registration, which is characterized in that the light from the illumination means is reflected on the inner circumferential surface of the eyepiece, and the peripheral part of the viewing frame plate is illuminated with this reflected light.
Endoscope as described in section. (4) The endoscope according to claim 1, wherein the illumination means is characterized in that the field frame plate is an electroluminescent panel.