JPH0223847B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement in an eyepiece device for an endoscope.

Generally, an endoscope includes an insertion section and an operating section, and the operating section is provided with an eyepiece.
This eyepiece device holds the other end of an image guide with one end facing the observation window provided at the distal end of the insertion section, and the other end of the image guide is held in focus by a diopter ring facing the other end of the image guide. A matchable eyepiece is retained. Therefore, by looking through this eyepiece and adjusting the focus, it is possible to observe the image formed by the eyepiece from the observation window through the image guide, that is, the end face image of the image guide. .

Incidentally, in an eyepiece with such a configuration, dust may adhere to the end face of the image guide during assembly, or dust may be generated from the sliding parts when the diopter ring is rotated during use. Dust entering the device through the sliding portion may adhere to the end surface of the image guide. Then, the dust enters the end face image of the image guide that is formed by the eyepiece, making it difficult to observe well, or in the worst case, making most of the observed image invisible. There was a big problem.

Furthermore, if the image guide is installed with its axis tilted with respect to the axis of the eyepiece, the image formed on the eyepiece will be shifted, and part of the image will be out of the field of view. .

This invention was made based on the above-mentioned circumstances, and its purpose is to prevent the image from being removed even if dust adheres to the end face of the image guide, making it difficult to perform good observation, or even if the image guide is installed with its axis tilted. To provide an eyepiece device for an endoscope that can prevent the eyepiece from going out of the field of view.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In FIG. 1, reference numeral 1 denotes an endoscope, and this endoscope 1 consists of an insertion section 2 and an operation section 3. The insertion section 2 has a distal end component 6 provided at the distal end of a flexible tube section 4 via a curved tube section 5, and an observation window 7 and an illumination window 8 are provided on the distal end surface of the distal end component 6. The forceps channel 9 is opened at the same time.
The operation section 3 includes an operation knob 10 for bending the bending pipe section 5, an air/water supply switching valve 11, and a suction operation valve 1.
2. A forceps insertion port body 13 that communicates with the forceps channel 9, an eyepiece device 14 that is optically connected to the observation window 7 as described later, and a light source device (not shown), which transmits illumination light from the light source device as described above. A universal cord 15 is provided through which a light guide (not shown) for emitting light from the illumination window 8 is inserted.

The eyepiece device 14 is constructed as shown in FIG. That is, the main body 16 of the operating section 3 is provided with a mounting hole 17, and a recess 18 formed around the mounting hole 17 has an insertion hole 19 having approximately the same diameter as the mounting hole 17, and a hole 19 is formed in the periphery of the mounting hole 17. A connecting body 21 having an annular wall 20 erected thereon is provided. This connecting body 21 has a flange 22 at its lower end, and the connecting body 21 is connected to the main body by a screw 23 via this flange 22.
A holding cylinder 24 fixed to 6 is provided.
An adjustment cylinder 25 is inserted into the holding cylinder 24 so as to be displaceable in the axial direction. An engagement groove 26 having a V-shaped cross section is formed on the outer peripheral surface of the upper end of the adjustment cylinder 25.
A plurality of first adjustment screws 27 are screwed into the engagement groove 26 so as to pass through the peripheral wall of the holding cylinder 24.
... (only one is shown) cone-shaped tips are engaged. Therefore, by screwing in the first adjustment screws 27, the adjustment cylinder 25 can be raised. A spring 29 is provided in a compressed state between the lower end surface of the holding cylinder 24 and a collar 28 formed at the lower end of the adjusting cylinder 25, and this spring 29 urges the adjusting cylinder 25 in the downward direction. are doing.

Further, a cylindrical mounting frame 30 is inserted into the adjustment cylinder 25 via an O-ring 31 so as to be displaceable in the radial direction. That is, on the peripheral wall of the adjustment cylinder 25, a plurality of second adjustment screws 31 are provided at equal intervals in the circumferential direction.
(only one is shown) is screwed into the mounting frame 3, and the conical tips of these second adjustment screws 31...
It engages with a stepped portion 32 formed on the outer circumferential surface of 0. Therefore, the mounting frame 30 can be positioned in the radial direction of the adjustment tube 25 by adjusting the protrusion amount of the tip of each second adjustment screw 31. The above mounting frame 30 has a presser tube 33.
The end portion of the image guide 34 is fitted through. This image guide 34 is attached to the above mounting frame 30.
It is fixed by a retaining screw 35 screwed into the upper end of the holder. Further, an annular wall 36 is formed at the upper end of the mounting frame 30 and projects upward from the end surface 34a of the image guide 34, and a transparent member 37 such as a glass plate is attached to the upper end of the wall 36 as a holding member. It is held by a presser ring 38.
That is, the transparent member 37 is disposed so as to be spaced apart from and opposite to the end surface 34a of the image guide 34 and cover the end surface 34a. And this transparent member 37
As shown in Figure 3, the upper surface of the upper and lower surfaces is a slope 3.
7a. As a result, when the image guide 34 is fixed to the mounting frame 30 with its axis line inclined, loosening the presser ring 38,
By rotating and positioning the transparent member 37, it is possible to correct the light rays emitted from the image guide 34 at an angle so that they become parallel to the optical axis of an eyepiece lens 41, which will be described later.

Further, the holding tube 24 is provided with an eyepiece tube 40 whose lower end is fitted into the holding tube 24 and fixed by a fixing screw 39. This eyepiece tube 4
A lens holder 42 holding an eyepiece lens 41 is inserted into the lens holder 42 so as to be vertically movable. In addition, the upper end surface of the eyepiece tube 40 is provided with a first through hole 43 having a smaller diameter than the inner diameter of the eyepiece tube 40 in the center and a storage wall 44 that protrudes in the vertical direction at the periphery. A connecting plate 46 having a plurality of claws 45 protruding radially outward from the lower end of the wall 44 is fixed with screws 47. This connection plate 46
A retaining plate 49 with a second through hole 48 having the same diameter as the first through hole 43 in the center part is attached to the upper surface of the screw 50.
It is fixed by. A protective wall 51 is vertically provided around the lower surface of this presser plate 49.
1 protrudes from an insertion hole 52 formed in the connection plate 46 to the lower surface side of the connection plate 46 . Furthermore, an O-ring 53 is provided between the peripheral portion of the presser plate 49 and the upper portion of the storage wall 44 to maintain airtightness therebetween. The first and second through holes 43,
48 is closed with a transparent cover 54 that protects the eyepiece 41 held by the lens holder 42. In addition, the lens holder 42 and the connection plate 46
A spring 55 is provided between the lens holder 42 and the lower surface of the lens holder 42 to urge the lens holder 42 downward.

On the other hand, on the outer periphery of the eyepiece tube 40, a photographing cam tube 56 having a first cam hole 56a formed in the peripheral wall is rotatably provided. The upper part of the photographing cam barrel 56 is expanded in diameter in a stepwise manner to have a larger diameter than the lower part, and this large diameter portion forms a space 57 between it and the eyepiece barrel 40. In addition, the photographing cam tube 5
A flange 58 extends radially outward from the upper end of the flange 6, and a portion of the flange 58 is further provided with a protrusion 59 projecting radially outward.
An annular wall 60 located on the outer periphery of the protective wall 51 is protruded from the upper surface of the flange 58, and an O-ring 61 is provided between the annular wall 60 and the lower part of the storage wall 44 to maintain airtightness therebetween. is provided.

A positioning barrel 62 is provided outside the photographing cam barrel 56.
is provided with its lower end fixed to the eyepiece tube 40 with a screw 63. The upper part of the positioning cylinder 62 is expanded in diameter in a stepwise manner, and an O-ring 63 is provided between the inner peripheral surface of the upper end and the outer peripheral surface of the photographing cam cylinder 56 to maintain airtightness therebetween. A diopter cam cylinder 64 having a second cam hole 64a is rotatably provided on the outside of the positioning cylinder 62, and is integrally attached to the outside of the diopter cam cylinder 64 with a screw 65. A combined diopter ring 66 is provided. An O-ring 67 is provided between the inner peripheral surface of the upper end of the diopter ring 66 and the upper outer peripheral surface of the positioning tube 62 to maintain airtightness therebetween. Further, a gap 68 is formed between the lower end surface of the diopter ring 66 and the upper end surface of the annular wall 20 of the connecting body 21 so that the first adjusting screws 27 can be viewed over the entire circumferential direction. ing. A sliding tube 69 having an outer diameter slightly smaller than the inner diameter of the diopter cam tube 64 is provided in the gap 68 so as to be movable up and down. A plurality of appearance rings 70, for example divided into two, are fixed to the outer peripheral surface of the sliding tube 69 by screws 71 so as to fill the gap 68. The upper and lower end surfaces of this appearance ring 70 are in contact with the lower end surface of the diopter ring 66 and the upper end surface of the annular wall 20. Therefore, the sliding tube 69 is held stationary by the appearance ring 70, but by removing this appearance ring 70, it can be raised to open the gap 68. In addition, when the gap 68 is closed, there are gaps between the outer circumferential surface of the upper and lower ends of the sliding tube 69 and the inner circumferential surface of the lower end of the diopter ring 66 and the inner circumferential surface of the annular wall 20. O-rings 72a and 72b are provided to maintain airtightness between the two.

On the other hand, a cam pin 73 is bored from the outer peripheral surface of the lens holder 42 . This cam pin 73
The first cam hole 56a is inserted into the first cam hole 56a through an axially long long hole 74 formed in the peripheral wall of the eyepiece tube 40 and a through hole 75 formed in the peripheral wall of the positioning tube 62.
and is inserted into the second cam hole 64a. Since the lens holder 42 is urged downward by the spring 55, the cam pin 7
3 is normally in contact with the second cam hole 64a. That is, the lens holder 42 is vertically positioned by the second cam hole 64a via the cam pin 73. Further, a groove 76 is formed around the upper surface of the holding plate 49, and a plurality of contact pins 77 are formed in this groove 76 so as to face the inner bottom surface.
(only one is shown) is provided. This contact pin 77 is electrically connected to a camera (not shown) attached to the eyepiece 14 via a photographing adapter 78, and is used to send various photographing signals to this camera. The lead wire 79 for transmitting the imaging signal connected to the contact pin 77 is connected to the presser plate 4.
The passage 80 is formed in the circumferential wall of the eyepiece tube 40 over the entire length in the axial direction from the space 57 inside the protective wall 51 vertically installed on the lower surface of the endoscope 9 , and the operating section 3 of the endoscope 1 is inserted through the passage 80 . via universal code 15
guided by. That is, the lead wire 79 connects to the photographing cam barrel 5, which is a rotating member that constitutes the eyepiece device 14.
6 or the diopter cam tube 64, and is led out from the eyepiece device 14.

Further, the eyepiece device 14 has an airtight interior where the end portion of the image guide 34 is held by a large number of O-rings provided between opposing surfaces of each member.

The photographing adapter 78 is of a bayonet type so that it engages with the outer peripheral surface of the storage wall 44 formed around the connecting plate 46 of the eyepiece 14 with the claws 45 formed at the lower end of the storage wall 44. When the photographing cam cylinder 56 is detachably attached to the photographic cam cylinder 56 and rotated by a predetermined angle to fix the photographing cam cylinder 56, the projection 59 formed on the photographing cam cylinder 56 engages with the photographing adapter 78. rotates by a predetermined angle. As a result, the lens holder 42 is raised via the cam pin 73 by the second cam hole 56a formed in the photographing cam barrel 56, and the eyepiece 41 held by the lens holder 42 is moved to the photographing position. It's summery.

According to the eyepiece device 14 configured as described above, if dust is generated by moving the lens holder 42 or rotating the photographing cam barrel 56 during use, or if dust enters the inside of the eyepiece device 14 during assembly, These dust particles do not directly adhere to the end surface 34a of the image guide 34, but rather adhere to the transparent member 37 disposed opposite to the end surface 34a. However, since the transparent member 37 is misaligned with the end surface 34a of the image guide 34, the transparent member 37
Dust attached to the lens is not imaged by the eyepiece lens 41. Therefore, since the field of view is not obstructed by dust attached to the transparent member 37, the operator can always perform good observation.

Furthermore, the upper surface of the upper and lower surfaces of the transparent member 37, which is disposed to face the end surface 34a of the image guide 34, is formed into a slope 37a. Therefore, when the image guide 34 is fixed to the mounting frame 30 with its axis line inclined, by rotating and positioning the transparent member 37, the image guide 34 can be rotated and positioned.
It is possible to correct the rays of light that are emitted from the lens at an angle so that they become parallel to the optical axis of the eyepiece lens 41. Therefore, since the image emitted from the image guide 34 can be formed without coming off the eyepiece 41, it is possible to prevent a part of the image from falling out of the field of view.

In this embodiment, the lower surface of the transparent member 37 may be formed into a slope 37a, and furthermore, both the upper and lower surfaces may be formed into slopes 37a.

As described above, in the present invention, a transparent member having at least one of the upper and lower surfaces sloped is provided between the eyepiece and the end surface of the image guide. Therefore, dust generated when assembling or using the eyepiece is prevented from adhering to the transparent member and directly adhering to the end face of the image guide, so that good observation is not hindered by the dust. I never get caught. Furthermore, even if the image guide is installed with its axis inclined with respect to the optical axis of the eyepiece, by rotating and adjusting the transparent member whose one surface is sloped, the light rays emitted from the image guide can be directed to the eyepiece. It can be parallel to the optical axis. Therefore, part of the image from the image guide is prevented from coming off the eyepiece, allowing for good observation.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall view of an endoscope, Fig. 2 is a sectional view of an eyepiece, and Fig. 3 is a sectional view of an eyepiece.
The figure is a sectional view of the end of the image guide. 14...eyepiece device, 34...image guide,
37... Transparent member, 37a... Slope, 41... Eyepiece.

Claims (1)

[Claims] 1. In an endoscope that holds an eyepiece and an end of an image guide opposite to the eyepiece, at least one of the upper and lower surfaces is sloped between the eyepiece and the end of the image guide. What is claimed is: 1. An eyepiece device for an endoscope, characterized in that a transparent member is provided, and the transparent member is held by a holding member so as to be rotatable with respect to an end face of an image guide.