JPH05127102A - Mechanism for adjusting position of lens barrel for endoscope - Google Patents

Abstract

PURPOSE:To accurately and easily align an optical axis in the optical system member of an observation window and a lens barrel part which holds an optical fiber. CONSTITUTION:As to an endoscope where the lens barrel part 21 to which the optical fiber 23 is attached is connected to a prism 20 on the observation window 12 side provided at the tip part 10 of the endoscope, the position of the optical axis of the lens barrel part 21 with respect to the observation window 12 and the prism 20 is adjusted by set screws 26a and 26b in a state where the lens barrel part 21 are supported by three points. Therefore, for example, in the case of a rear viewing type endoscope, the endoscope is assembled in a state where the optical axis of the lens barrel part 21 is accurately positioned at the rear viewing position of the observation window 12 by two set screws 26a and 26b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel position adjusting mechanism for an endoscope, and more particularly to a lens barrel position adjusting mechanism used for adjusting an optical axis in a side-viewing type endoscope into which a treatment tool can be inserted. Regarding

[0002]

2. Description of the Related Art Endoscopes for observing the inside of body cavities such as thin tubes by optical means are well known. With this type of endoscope, various treatments such as forceps are performed while observing the state of the inside of the body to be observed. Various treatments such as incision, biopsy and recovery are performed using the tool.

FIG. 3 shows the structure of an optical system for observing the inside of an object to be observed at the tip of a conventional side-view endoscope. This side-view endoscope is the tip of an endoscope. An observation window 2 is provided on the side surface 1 (upper side of the drawing). A lens barrel portion 4 is connected to the observation window 2 via a prism 3, and the lens barrel portion 4 has a configuration in which an objective lens system 6 is attached to an optical fiber 5. The lens barrel portion 4 is inserted into the insertion hole 7 and then positioned by the set screw 8. An adhesive or the like is poured between the lens barrel portion 4 and the prism 3 and then fixed. Become. Note that FIG.
3A is a sectional view taken along line AA of FIG.

FIG. 3B shows the BB line in FIG. 3A.
A sectional view is shown, and the set screw 8 can be adjusted by a driver or the like from the outer peripheral surface of the endoscope. Further, a light guide 9 for supplying irradiation light into the body to be observed is arranged below the lens barrel 4.

[0005]

However, in the conventional endoscope, it was relatively difficult to align the optical axis (center) of the lens barrel portion 4 with the predetermined positions of the observation window 2 and the prism 3. Particularly, in recent years, a rear-viewing type side-viewing endoscope is used. In this type of endoscope, the optical axis of the lens barrel portion 4 is shifted to the rear-viewing position, so that optical axis alignment becomes complicated. There is. That is, a rear-viewing type endoscope raises the treatment tool by a stand up to a position tilted further to the rear side by 7 ° to 15 ° from the vertical state, and for example, ERCP (endoscopic pancreaticobiliography).
In this case, the nipple portion existing on the rear side of the side surface in the endoscope insertion direction is treated. For this reason, in this rear-viewing type endoscope, the lens barrel portion 4 is moved to the rear-viewing position 101, which is displaced tmm rearward from the center position 100 in the normal side-viewing type endoscope.
The optical axis (center) of is arranged. Therefore, the adjustment of only the set screw 8 cannot properly align the optical axis of the lens barrel portion 4 with the rear-viewing position 101, and in the past, the tip portion of the lens barrel portion 4 was scraped, or other suitable fitting was performed. I had to reselect the lens barrel 4.

Further, the above-mentioned problems occur not only in rear-viewing type endoscopes but also in conventional side-viewing type or direct-viewing type endoscopes. If this problem can be improved, assembly work will be performed. Can be easy.

The present invention has been made in view of the above problems, and an object thereof is to accurately and easily perform optical axis alignment in an optical system member of an observation window and a lens barrel holding an optical fiber. It is to provide a lens barrel position adjusting mechanism for an endoscope.

[0008]

In order to achieve the above object, the present invention connects an optical system member on the observation window side provided at the distal end of an endoscope with a lens barrel having an optical fiber. In the endoscope, there is provided an adjusting means for adjusting the optical axis position of the lens barrel portion with respect to the optical system member on the observation window side at least at two positions while the lens barrel portion is supported at three points. To do.

[0009]

According to the above construction, the set screws are attached to the two positions in the length direction of the endoscope so that the position of the lens barrel can be moved from the outer peripheral portion of the endoscope. By moving the set screw, the position and inclination of the optical axis of the lens barrel portion are adjusted. Therefore, by adjusting the set screw, the optical axis of the lens barrel can be accurately and easily aligned with the predetermined position of the optical system member of the observation window. The optical axis can be set accurately.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an endoscope to which a lens barrel position adjusting mechanism according to an embodiment is applied, and FIG. 1 (a) shows the distal end portion of the endoscope with the observation window side facing upward. Is a top view, FIG. (B) is a sectional view taken along line BB of FIG. (C), and FIG.
6 is a cross-sectional view taken along line CC of FIG. As shown in FIG.
An irradiation window 11 and an observation window 12 are arranged on the side surface of the, and a stand 14 is rotatably attached by a shaft 15. A wire 16 connected to an upright operation knob of an operation unit is connected to the upright stand 14, and the pulling operation of the wire 16 causes the upright stand 14 to stand upright from the side surface. In the vicinity of the rear side of the upright table 14, the forceps port 1 that communicates with the treatment instrument insertion channel (forceps channel).
7 is provided, and the treatment tool 200 is led out from the forceps port 17.

In FIG. 1B, a light guide 19 is connected to the irradiation window 11, and a lens barrel portion 21 is connected to one observation window 12 via a prism 20. The lens barrel portion 21 has a configuration in which an optical fiber 23 is connected to the objective lens system 22, and the lens barrel portion 21 is inserted into an insertion hole 24 having a diameter slightly larger than the outer circumference thereof. According to the observation window 12 having such a configuration, the treatment tool 200 is bent in the rear-viewing direction inclined by, for example, 7 ° to 15 ° by the standing base 14 indicated by the chain line, and the distal end portion of the treatment tool 200 is centrally located. It can be observed through the observation window 12 in the state of being positioned at.

In such a tip structure, in the embodiment, two adjusting portions are provided in the length direction. That is, set screws 26a and 26b that are screwed into the female screw portions 25a and 25b formed on the tip portion 10 are provided. Incidentally, in the embodiment, the set screw 27 is arranged on the lens barrel portion 21 itself at substantially the same position as the set screw 26b. Figure 1
(C) shows a cross-sectional view cut at the portion of the set screw 26a, but as shown in the figure, the set screws 26a and 26b are not seen from directly under the observation window 12 but rather from the side surface slightly. The body portion 21 will be pressed down.

The embodiment is constructed as described above, and is shown in FIG.
The operation will be explained based on. The lens barrel portion 21 is attached by inserting the lens barrel portion 21 into the insertion hole 24 with the observation window 12 and the prism 20 attached, but FIG. 26
When b is turned by a driver or the like, the lens barrel 2 is moved to a position deviated by smm from the rear-view position 101 to be set.
One optical axis 110 will be located. Therefore, as shown in FIG. 2B, by rotating the set screw 26a on the front side with a driver or the like, the rear view position 1 deviated by t mm from the center position 100 which is the original optical axis position of the observation window 12.
The optical axis 110 of the lens barrel portion 21 is aligned with 01. Thus, in the embodiment, two set screws 2 are provided.
Using the adjusting means 6a and 26b, two set screws 26
The optical axes of the lens barrel portion 21 with respect to the observation window 12 and the prism 20 can be accurately and easily adjusted by supporting the lens barrel portion 21 by the three points a and 26b and the wall facing them. The attachment of the lens barrel portion 21 to the prism 20 is performed by finally pouring an adhesive.

Further, the present invention is not limited to the rear-viewing type, but the optical axis adjustment can be accurately and easily performed even in the case of a standard side-viewing endoscope. That is, as shown in FIG. 2C, for example, by further pushing out the set screw 26a from the state of FIG.
The optical axis 110 of the lens barrel portion 21 can be aligned. In this case, it is possible to observe the distal end direction of the treatment tool 200 bent vertically by the upright stand 14 at the forceps opening 17 of the endoscope 10 in FIG.

The set screw 27 provided on the lens barrel portion 21 itself is provided so as to be more easily adjusted, and it is assumed that the set screws 26a and 26b and the wall facing them are three points. Even if the optical axis cannot be set at a good position even by the above, the set screw 27 is pushed out, and the optical axis is adjusted by supporting the set screw 27 and the two set screws 26a and 26b at three points. It can be carried out.

In the above embodiments, the side-view type endoscope has been described, but the present invention can be similarly applied to a direct-view type endoscope in which an observation window is provided at the front end face portion of the tip portion. It is possible. Further, although the set screws 26a, 26b, 27 are provided as the adjusting means in the above-mentioned embodiment, the adjusting means is not limited to this, and the adjusting means may be constituted by another screw type, a spring, a cam or the like. You can

[0017]

As described above, according to the present invention,
In an endoscope in which a lens barrel having a fiber attached is connected to an observation window provided at the distal end of the endoscope, adjustment of the optical axis position of the lens barrel with respect to the optical system member on the observation window side is performed by Part 3
Since the adjusting means for performing point support is provided at least at two positions, the optical axis of the lens barrel can be adjusted accurately, and the optical axis can be properly set at the rear-viewing position even when assembling a rear-viewing type endoscope. can do. Moreover, the adjustment of the optical axis is facilitated by the adjustment at two locations, and there is an advantage that the assembly work of the distal end portion of the endoscope can be performed in a short time.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an endoscope to which a lens barrel position adjusting mechanism of an endoscope according to an embodiment of the present invention is applied, and FIG. 1A is a top surface of a distal end portion with an observation window side facing upward. Figure, Figure (b) is a BB cross-sectional view of Figure (c), Figure (c) is CC of Figure (a)
FIG.

2A and 2B are diagrams showing an optical axis adjusting action in an observation window and a lens barrel portion of an embodiment, FIG. 2A is a side view showing a state before adjustment, and FIG. 2B is a rear view type at a predetermined position. The side view of the case where they are aligned, and FIG. 6C is the side view of the case where they are aligned with the center position of a normal side-view endoscope.

3A and 3B are diagrams showing a configuration of a conventional endoscope distal end portion, in which FIG. 3A is a side view of the distal end portion with an observation window on the upper side, and FIG. FIG.

[Explanation of symbols]

 1, 10 ... Tip part, 2, 12 ... Observation window, 3, 20 ... Prism, 4, 21 ... Lens barrel part, 5, 23 ... Optical fiber, 25a, 25b ... Female screw part, 26a, 26b, 27 ... Set Screw.

Claims (1)

[Claims] 1. An endoscope in which a lens barrel section having an optical fiber is connected to an optical system member on the observation window side provided at the distal end portion of the endoscope, wherein the lens barrel section with respect to the optical system member on the observation window side is connected. A lens barrel position adjusting mechanism for an endoscope, which is provided with adjusting means for adjusting the optical axis position at at least two positions in a manner that the lens barrel portion is supported at three points.