JPH03276115A - Front end part of side-looking endoscope - Google Patents

Abstract

PURPOSE:To considerably reduce the repair cost by providing a head part which is freely attached to and detached from the front end of a body part provided with storage chambers for an objective optical system and an illumination bundle and taking out only the objective optical system and the illumination bundle. CONSTITUTION:A front end part main body 1 consists of a body 11 and a head part 12 which is freely detachably attached to the front end of the body 11 by a fixing screw. The body part 11 is provided with a storage chamber for an objective optical system 30 consisting of a rectangular prism 31, a con cave lens 32, and a lens system 33 and a storage chamber for an image guide fiber bundle 38. At the time of assembling, the objective optical system 30 is inserted from the front of the body 11 and is fixed by a screw, and the illumi nation bundle 38 is inserted from the rear of the body part and is fixed by a screw 39. At the time of repair or the like, these screws are loosened to easily take out and replace only the objective optical system 30 and the bundle 38, and therefore, the repair cost is considerably reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a distal end of a side-viewing endoscope for observing the side of the distal end main body.

[Conventional technology]

In the tip of a conventional side-viewing endoscope, a hole is drilled in the tip body that communicates with each other from the rear and the sides, and the objective optical system is inserted into the hole from the rear and the sides. Was. Further, as shown in FIG. 16, the tip body 91
A groove 92 reaching the rear and a hole 93 opening laterally are bored to communicate with each other, the tip portion 94 of the illumination light guide fiber bundle is fitted therein, and the groove 92 is filled with adhesive. was. 95 is a cover attached to cover the outer surface of the tip main body 91.

[Problem to be solved by the invention]

However, if the objective optical system is inserted into the tip body from the rear and bonded, or if adhesive is filled into the groove in which the illumination light guide fiber bundle is inserted, the objective optical system It is not easy to separate and remove only the light guide fiber bundle for illumination or illumination from the tip body. Therefore, when repairing, all the parts assembled into the tip body are often replaced as a unit, which has the drawback of significantly increasing repair costs.

The present invention eliminates such conventional drawbacks and provides a distal end of a side-viewing endoscope in which the objective optical system and illumination light guide fiber bundle can be easily removed from the distal end body and replaced. The purpose is to

Further, a sealing means may be provided for watertightly sealing the connection portion between the body portion of the tip body and the head portion.

[Effect]

When the head of the tip body is removed from the body, at least one of the objective optical system or the illumination light guide fiber bundle is exposed at the front end of the body, and by pulling it forward, it can be removed from the tip body. I can do it.

[Means to solve the problem]

In order to achieve the above object, the distal end of the side-viewing endoscope of the present invention has a distal end body provided at the distal end of the insertion section, a body section fixed to the distal end of the insertion section, and a distal end thereof. a head removably attached to the side, and at least one of an objective housing hole for housing an objective optical system and a light guide housing hole for housing a tip portion of an illumination light guide fiber bundle. is formed by opening at the front end of the body.

〔Example〕

Examples will be described with reference to the drawings.

1 to 3 show the distal end portion of a side-viewing endoscope according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes a distal end main body made of, for example, stainless steel or synthetic resin, and provided at the distal end of the insertion section. They are arranged side by side. 20 is a curved portion that can be bent freely by remote control;
21 is a node ring rotatably connected to each other, 22 is a mesh tube, and 23 is a jacketed rubber tube.

The tip body 1 is divided into a body 11 which is the main part, and a head 12 which is detachably attached to the tip. The trunk 11 has the most advanced node ring 21.
That is, the head 12 is fixed to the tip of the insertion section, and the head 12 is detachably attached to the tip of the body 11 by a fixing screw 13 inserted from the front.

The objective optical system 30 includes a right-angle prism 31, a concave lens (front group lens) 32 placed on the optical path in front of the prism 31, and a lens system (rear group lens) placed on the optical path behind the prism 31. 33, and a parallel plane glass plate 34 provided between the prism 31 and the front group lens 32 to bond them together. The rear lens group 33 is housed in a lens frame 36, and the tip of the image guide fiber bundle 38 is attached to the rear half of a lens barrel 37 that is fitted and connected to the outer periphery of the lens frame 36. There is. Note that the glass plate 34 is formed to have the same diameter as the front group lens 32. Reference numeral 39 denotes a lens barrel fixing screw that presses the lens barrel 37 from the outer peripheral surface to elastically deform it and fixes the lens barrel 37 and the image guide fiber bundle 38 to the body 11 of the tip body at the same time.

An objective accommodation hole 15 for accommodating an objective optical system 30 is formed in the tip body 1 and opens at the front end of the body 11 . Of the objective housing holes 15, the lens barrel insertion hole 15a through which the lens barrel 37 is inserted is arranged parallel to the axis of the tip body 1 in the body portion 1.
The prism housing hole 15b, which is formed to penetrate through the body part 11 and accommodate the prism 31, is slightly larger than the prism 31, and is formed astride the body part 11 and the head part 12. The front group lens accommodation hole 15c for accommodating the lens 32 and the glass plate 34 is formed between the body part 11 and the head part 1.
2, each of which is formed into a semicircular shape. Therefore, all of the objective optical systems 30 can be inserted into and removed from the body 11 from the front (from the left in FIG. 1).

The objective optical system 30 of this embodiment can be assembled as an objective optical system unit by aligning the optical axis in advance before being attached to the tip main body l.

4 and 5 show an example of the state when assembling the objective optical system unit 40. For example, a jig that can hold the front group lens 32 and move it slightly in the vertical and horizontal directions is used. 41 to align the optical axes of each lens 32, 33 and prism 31 constituting the objective optical system 30,
In this state, the objective optical system unit 40 is completed by integrally joining and fixing them together with the glass plate 34, lens frame 36, etc. as shown in FIG.

Next, as shown in FIG. 6, the body 1 of the tip body
1, the objective unit 40 is inserted from the front, and the head 12 is further turned over from the front and fixed with fixing screws 13.

A sealing material is applied to the joint between the head 12 and the body 11 to prevent water from leaking into the objective optical system 30 from the outside.

Next, the image guide fiber bundle 38 is inserted into the lens barrel 37 from the rear of the body 11. As a result, the optical axes of the image guide fiber bundle 38 and the objective optical system 30 are aligned through the lens barrel 37, and the image guide fiber bundle 38 is positioned at the imaging position of the observation image by the objective optical system 30.
Set the image incident end surface 38a and tighten the lens barrel fixing screw 39.

In the distal end of the side-viewing endoscope assembled in this way, after the objective optical system 30 is attached to the distal end main body 1, there is no need to perform a -cut optical axis adjustment operation. When removing the objective optical system 30 for repairs etc.,
After turning over the outer rubber tube 23 and loosening the lens barrel fixing screw 39, loosening the fixing screw 13 and removing the head 12 from the body 11, the objective optical system unit 40 can be pulled forward all at once, and the tip can be removed. It can be removed from the main body 1.

7 to 9 show the distal end of a side-viewing endoscope according to the second embodiment of the present invention, in which a seal is provided at the connection part between the head 12 and the body 11 of the distal end main body. A rubber ring 19 is attached. This rubber ring 19 is, for example, the first θ
As shown in the figure, a large ring portion I9a that is fitted into the connecting portion of the tip main body l and a small ring portion 19b that is fitted into a groove formed on the outer periphery of the front group lens 32 are integrally formed. . Further, as shown in FIG. 8, an O-ring 18 for sealing is also attached to the head of the fixing screw 13. As a result, the tip body 1 is watertightly sealed, and water or the like does not enter the tip body 1 from the outside even without applying a sealant to the connecting portions or the like.

The other parts of the second embodiment are the same as those of the first embodiment, so the same reference numerals are given and the explanation thereof will be omitted.

11 to 13 show a third embodiment of the present invention, in which an observation window 2 and an illumination window 3 are arranged side by side in a direction perpendicular to the axis of the tip body 1, and the tip part The length of the main body 1 is formed short. In addition, the head 12 of the tip body 1
is removably attached to the tip of the body 11 by a fixing screw 13 inserted from the front.

The distal end portion of the illumination light guide fiber bundle 5I is smoothly bent laterally, and its output end face 51a is located inside the illumination window 3, and emits illumination light in the observation direction in front of the observation window 2. . 52 is a concave lens provided in the illumination window to widen the light distribution angle of illumination light.

Reference numeral 53 denotes a light guide base fixed to the outer peripheral portion of the illumination light guide fiber bundle 51, and the illumination light guide fiber bundle 51 is formed so that there is no part thicker than the light guide base 53 over the entire length. 54 is a light guide fiber bundle 5 for illumination.
This is a flexible exterior tube that exteriorizes the 1.

A light guide accommodating hole 17 for accommodating the distal end portion of the illumination light guide fiber bundle 51 is formed in the distal end body 1 and opens at the front end of the body section 11 . The hole 17a of the light guide holder 53 into which the light guide base 53 is inserted is bored through the body 11 in the axial direction, and the curved output end of the light guide fiber bundle 51 for illumination. The output end accommodating hole 17b for accommodating the portion is formed astride the body portion II and the head portion I2 of the tip body. Further, the concave lens housing hole 17c for housing the concave lens 52 is formed in an exactly semicircular shape so as to straddle the body portion 11 and the head portion 12.

Therefore, the illumination light guide fiber bundle 51
can be inserted into and removed from the body 11 from the front (left side in the figure), and by tightening the light guide fixing screw 55, the light guide base 53 is fixed to the body 11 of the tip body. Ru.

Further, a rubber ring 64 for sealing is attached to the connecting portion between the head 12 and the body 11 of the tip body. As shown in FIG. 14, this rubber ring 64 includes a large ring portion 64a that is fitted into the connecting portion of the tip body 1, and a small ring portion 64 that is fitted into a groove formed on the outer periphery of the front group lens 32.
4b, a small ring portion 64c that is fitted into a groove formed on the outer periphery of the concave lens 52 is integrally formed. Further, an O-ring 18 for sealing is attached to the head of the fixing screw 13. As a result, the tip body 1 is watertightly sealed, and water and the like do not enter into the tip body 1 even without applying a sealant or the like to the connecting portion or the like.

In this embodiment, the objective optical system 30 and other parts are the same as those in the first and second embodiments, so a description thereof will be omitted.

In this way, in this embodiment, during repairs, etc.,
Turn over the outer skin tube 23 and remove the light guide fixing screw 5.
5, loosen the fixing screw 13 and attach the head 12 to the body 1.
1, the illumination light guide fiber bundle 51 can be pulled forward and taken out from the tip body 1.

Further, as in each of the above-described embodiments, the objective optical system unit can also be pulled out forward.

In addition, at the tip of a small-diameter side-viewing endoscope, the 15th
As shown in the figure, the observation window 2 and the illumination window 3 are arranged in the axial direction of the tip body I, and the body 11 and the head 1 of the tip body 1 are arranged.
2 may be connected in the center of the lighting window 3 so that only the lighting light guide fiber inside the lighting window 3 can be pulled out forward.

〔Effect of the invention〕

According to the distal end of the side-viewing endoscope of the present invention, only the objective optical system and the illumination light 4 guide fiber bundle can be easily removed from the distal end main body, significantly reducing repair costs. It has excellent effects.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of the first embodiment, Fig. 2 is a plan view of the embodiment, Fig. 3 is a sectional view taken along line III-III of the embodiment, and Fig. 4 is a sectional view of the embodiment.
Figure 5 is a side sectional view when assembling the objective optical system unit, Figure 5 is a plan view when assembling the objective optical system unit, Figure 6 is a side sectional view when assembling the tip body, Figure 7 is the second Fig. 8 is a plan view of the embodiment, Fig. 9 is a sectional view taken along line IX-IX of the embodiment, and Fig. 1O is a perspective view of the sealing rubber ring of the embodiment. , Fig. 11 is a side sectional view of the third embodiment, Fig. 12 is a plan view of the embodiment, Fig. 13 is a sectional view taken along the line X1ll-Xllll of the embodiment, and Fig. 14 is a cross-sectional view of the embodiment. FIG. 15 is a perspective view of the sealing rubber ring, FIG. 15 is a plan view of the fourth embodiment, and FIG. 16 is a side sectional view of the conventional example. 1...Tip body, 11--Torso, 12--Head,
13...Fixing screw, 15.One object accommodation hole, 17...
Light guide housing hole, 19-・Rubber ring, 3o...
Objective optical system, 40... Objective optical system unit, 51...
・Light guide fiber bundle for lighting, 64...Rubber ring. 15c Figure 3 Figure 4 Figure 5 Figure 9/ ]2 1] Figure 12 Figure 13 Figure 92 Figure 16

Claims (1)

[Claims] 1. The tip body provided at the tip of the insertion section is formed by a body section fixed to the tip of the insertion section and a head detachably attached to the tip side. and at least one of an objective housing hole for housing the objective optical system and a light guide housing hole for housing the tip portion of the illumination light guide fiber bundle is formed by opening at the front end of the body. The distinctive tip of a side-viewing endoscope. 2. The distal end of a side-viewing endoscope according to claim 1, further comprising a sealing means for watertightly sealing a connecting portion between the body of the distal end main body and the head.