JPS5895317A - Eyepiece device of endoscope - Google Patents

Abstract

PURPOSE:To prevent dust from adhering onto an end face of an image guide, by providing a nonparallel plate-shaped transparent member between an eyepiece and the end face of the image guide. CONSTITUTION:A transparent member 37 whose upper surface is an inclined surface is fixed to a fitting part frame 30 and is placed through a holding ring 38, between an eyepiece and an end face of an image guide 34. According to such constitution, in case when the image guide 34 is fixed to the fitting frame 30 in a state that the axis is inclined, a light beam emitted slantingly from the image guide 34 can be made parallel. Also, by the transparent member 37, it is prevented that dust adheres onto the end face of the image guide 34.

Description

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

Generally, an endoscope is composed of an insertion section and an operating section, and the operating section is provided with a contact device. This eyepiece device holds the other end of an image guide with one end facing an observation window provided at the distal end of the insertion section, and a diopter cylinder facing the other end of the image guide. It holds an eyepiece lens that can be focused. Therefore, by looking through this eyepiece and adjusting the focus, it is possible to observe the iron that passes through the image guide through the observation window and is condensed at the eyepiece, that is, the dust at the end of the image guide. It has become.

By the way, in such an eyepiece with a horizontal structure, dust may adhere to the end face of the image guide during assembly, and dust may be generated from the sliding parts when the diopter ring is rotated during use, or dust may be generated from the sliding parts when the diopter ring is rotated during use. Dust that enters the device from other parts may adhere to the end surface of the image guide. As a result, the dust gets into the edge of the image guide that is fixed by the eyepiece, making it difficult to observe well, and in the worst case, most of the observation edge becomes invisible. There was a major performance problem in that the power was too high.

This invention has been made based on the above circumstances, and its object is to provide a transparent member between the eyepiece and the image guide to prevent dust from forming on the end surface of the image guide during assembly or use. It is an object of the present invention to provide an eyepiece device for an endoscope that is free from adhesion and impeding good observation.

An embodiment of the present invention will be explained below with reference to FIGS. 1 and 2. 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 is flexible and has a distal end component 6 provided at the distal end of the U 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. and the forceps channel 9 is open. The operation section 3 includes γ
■ Optically connected to the operation knob 10 for bending the bending pipe section 5, the air/water supply switching valve 11, the suction operation valve 12, the forceps insertion port body 13 that communicates with the forceps channel 9, and the observation window 7 as described later. is connected to the eyepiece device 14 and a light source device (not shown), and the illumination light from this light source device is transmitted to the illumination window 8.
A universal cord 15 is provided, through which a light guide (not shown) is inserted.

The eyepiece device 14 is constructed as shown in FIG. That is, the main body 16 of the operation part 30 is provided with a mounting hole 17, and a recess 18 formed around the mounting hole 17 has a push-through hole 19 having the same diameter as 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 on its lower end.
and connect the main body 1 together with the connecting body 21 with the screw 23.
A holding cylinder 24 fixed to 6 is provided. An adjustment shaft 25 is inserted into the holding cylinder 24 so as to be movable in the axial direction.

On the same surface outside the upper end of this adjustment direction 25, there is an engagement l having a V-shaped cross section.
#26 is formed, and a plurality of first adjustment screws 27 (only one is shown) are screwed into this engagement groove 26 so as to pass through the peripheral wall of the upper 8c floor holding cylinder 24. The two ends are engaged. Therefore, the first adjustment screw 27...
By screwing in, the adjustment direction 25 can be raised. Note that the upper end surface of the holding cylinder 24 and
There is a spring 29 between the collar 28 formed at the lower end of the alignment 25.
is provided at a pressure 41d, and the spring 29 biases the adjustment direction 25 in the downward direction.

Further, a sieve-shaped mounting frame 30 is inserted into the adjustment direction 25 via an O-cylinder 31 so as to be able to tiff in the radial direction. That is, on the peripheral wall of the d circumferential adjustment 25, a plurality of 3 second adjustment screws are provided at equal intervals in the circumferential direction (only one is shown).
are screwed into the second adjustment screws 31 , and the conical tips of the second adjustment screws 31 engage with a step 32 formed on the outer peripheral surface of the mounting frame 30 . Therefore, the mounting frame 30 can be positioned in the radial direction of the adjustment direction 25 by adjusting the protrusion amount of the tip of each second adjustment screw 31 . An end portion of an image guide 34 is fitted into the mounting frame 30 via a presser tube 33. This image guide 34 is fixed by a retaining screw 35 screwed into the upper end of the taking frame 30. Further, an end 34a of the image guide 34 is provided at the upper end of the mounting frame 30.
An annular wall body 36 is formed that protrudes upwardly, and a transparent member 37 such as a glass plate is held at the upper end of the frame body 36 by a retaining ring 38. That is,
The transparent member 37 is arranged so as to be spaced apart from and opposite to the end 34ta of the image guide 34, and to face this end s4a'1ctl).

Generally, the holding cylinder 24 has a contact w direction 40 whose lower end is fitted into the holding cylinder 24 and fixed by a fixing screw 39.
is provided. This eyepiece direction 40 includes an eyepiece lens 4.
A lens holder 42 holding a lens holder 1 is pushed in so as to be vertically movable.

Also, on the upper end surface of the eyepiece direction 40, there is an eyepiece direction 40 on the center part.
A first through-hole 43 having a smaller diameter than the inner diameter of 0 is bored, and a storage wall 44 that protrudes in the vertical direction is provided at the periphery, and a plurality of claw portions 45 extend from the lower end of this storage wall 44 in the radial direction. A connecting plate 46 projecting outward is fixedly provided with screws 47. A presser plate 49 having a second through hole 48 having the same diameter as the first through hole 43 in the center thereof is fixed to the upper surface of this contact plate 49 by screws 50. A replacement wall 5 is provided vertically around the lower surface of the holding plate 49, and the retaining wall 51 projects from an insertion hole 52 formed in the connecting plate 46 to the lower surface side of the connecting plate 46. Further, 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. A spring 55 for biasing the lens holder 42 downward is provided between the first and second through holes 43 and 48 and the lower surface of the eyepiece plate 46 held by the lens holder 42. .

On the other hand, a first cam hole 5 is formed in the peripheral wall on the outer periphery of the eyepiece tube 40.
A photographing cam 856 having a hole 6h 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. Also,
A hook 58 extends radially outward from the upper end of the photographing cam barrel 56, and a portion of this hook 1458 is further provided with a protrusion 59 projecting outwardly in the radial direction. The upper surface of the tsuba 58 has an upper surface t! An annular wall 60 located on the outer periphery of the wall 51 is provided protrudingly, and this annular wall 60 and the storage wall 44
There is an O-ring 61 between the lower part of the
is provided.

A positioning barrel 62 is provided outside the photographing cam barrel 56 with its lower end fixed to the eyepiece barrel 40 with a screw 63.

The upper part of this positioning member 62 is expanded in diameter in a stepwise manner, and an O-ring 63 is provided between the inner circumferential surface of this upper end and the outer circumferential direction of the photographing cam barrel 56 to maintain airtightness therebetween. . A second cam #L 64 is provided outside the positioning tab 62.
A diopter cam cylinder 64 with a hole a is rotatably provided, and a diopter ring 66 is provided on the outside of the diopter cam cylinder 64 and integrally connected thereto with a screw 65.

The inner peripheral surface of the upper end of this diopter ring 66 and the positioning ring 6
An O-ring 67 is provided between the upper outer circumferential surface of 2 and the upper outer circumferential surface of 2 to maintain airtightness between them. Further, there is a gap 68 between the lower end surface of the diopter ring 66 and the upper end surface of the annular wall 20 of the connecting body 2 through which the first screws 27 can be viewed over the entire circumferential direction. It is formed. 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 external rings 7θ, for example, divided into two, are fixed to the outer peripheral surface of the sliding tube 69 with 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 6
9 is held by an external ring 70 so that the latch 1 does not open, but by removing this outer cylinder 70''lr, it can be raised to open the gap 68. Also, if the gap 68 is closed In this state, 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 ki20, there are IJing 72a, 72b
is provided.

On the other hand, the cam bin 7 is visible from the outer peripheral surface of the lens holder 42.
3 is installed protrudingly. The cam bin 73 is connected to the first cam hole 56a and the second cam hole 73 through an elongated hole 74 formed in the circumferential wall of the eyepiece tube 40, which is long along the axial direction, and a through hole 75 formed in the circumferential wall in the upright direction 62. is inserted into the cam hole 64a of. In addition, since the lens holder 42 is urged downward by the spring 55, the cam bin 73
is normally in contact with the second cam hole 64a. That is,
The lens holder 42 is vertically positioned by a second cam hole 64a via a cam bin 73. 1
However, a recessed groove 76 is formed around the upper surface of the presser plate 49, and 4X number of contact pins 77 (only one is shown) are provided in this recess so as to face the inner bottom surface of the recess 76. . This contact pin 77 is electrically connected to a camera (not shown) mounted on the eyepiece 14 via a photographing adder 78 to send various photographing signals to the camera.

The lead wire 79 for transmitting the imaging signal connected to the contact pin 77 is formed over the entire length in the axial direction from the space 57 inside the protective wall 51 formed on the lower surface of the presser plate 49 to the circumferential wall of the eyepiece tube 40. The universal cord 1 is passed through the passageway 80 that is connected to the
It is guided by 5. In other words, the lead wire 79 is led out from the eyepiece 14 without coming into contact with the photographing cam 56 or the diopter cam 64, which are rotating portions of the eyepiece 14.

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

A claw portion 4 formed at the lower end of this storage wall 44 on the outer peripheral surface of
5... is detachably attached by a bayonet method, and when it is attached and rotated by a predetermined angle to fix it, the protrusion 59 formed on the photographing cam 56 and the above-mentioned photographing adapter 78 are attached. The photographing cam 56 is rotated by a predetermined angle by engagement with the cam. As a result, the lens holder/2 is raised through the second cam hole 56a formed in the photographing cam holder 56 via the cam pin 73, and the eyepiece 41 held by the lens holder 42 is moved to the photographing position. It has become.

According to the eyepiece device 14 configured as described above, if dust is generated due to movement of the lens holder 42 or rotation of the photographic cam 56 during use, or if dust gets into the inside of the eyepiece device 14 during assembly, the dust will be removed. Image guide 3 for dust
This end surface 34 without being directly attached to the end 34a of 4.
It attaches to the transparent part shrine 37 arranged opposite to a.

However, this transparent part moon 32 is the image guide 34
Since the position is shifted from the end surface 34a of the transparent member 37, dust attached to the transparent member 37 is not collected 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.

FIG. 3 shows another embodiment of the present invention, in which the upper surface of the upper and lower surfaces of the transparent portion 37 is formed into a slope 37a. According to such a configuration, the image guide 3
4 is fixed to the mounting frame 30 with its axis line inclined, by rotating and positioning the transparent member 37, the light rays emitted from the image guide 34 at an angle can be directed to the optical axis of the eyepiece 410. It can be corrected so that it is parallel to .

In this embodiment, the lower surface of the transparent member 37 is connected to the slope 3.
7a, and furthermore, both upper and lower surfaces may be formed with slopes 37a.
You can also use it as

As described above, in the eyepiece device of an endoscope, the present invention provides a transparent member between the eyepiece lens and the end surface of the image guide, so that dust generated during assembly or use of the eyepiece device can be removed from the transparent member. It is not attached to the body part and directly attached to the end face of the image guide. Since the transparent part assembly is misaligned with the end surface of the image guide, 13- dust adhering to the transparent member is not collected by the eyepiece, so the dust does not interfere with observation. .

[Brief explanation of the drawing]

Fig. 1 is an overall view of an endoscope showing one embodiment of the present invention, Fig. 2 is a sectional view of the eyepiece, and Fig. 3 is a sectional view of the end of the image guide showing another embodiment of the invention. It is. 14... Eyepiece device, 34... Image guide, 37
. . . Transparent member, 37a . . . Slope, 41 . . . Eyepiece. Applicant's agent Patent attorney Takehiko Suzue rs, 14- -107-

Claims (2)

[Claims] (1) In an eyepiece device that holds an eyepiece lens and has an end portion of an image guide facing the eyepiece lens fM-1+, a transparent member is provided between the eyepiece lens and the end surface of the image guide. An endoscope eyepiece device characterized by: (2) The eyepiece device for an endoscope according to claim 1, wherein at least one of the upper and lower surfaces of the transparent member is sloped.