JPH0618331Y2 - Objective optical system adapter attachment / detachment mechanism for endoscopes - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an endoscope in which an objective optical system can be replaced at any time according to a distance to a subject to be observed,
In particular, it relates to a mounting / demounting mechanism for the objective optical system.

[Conventional technology]

In a conventional endoscope, in order to image light from a subject illuminated with illumination light on an image forming surface of a solid-state image pickup device such as an optical fiber bundle for image guide or a charge coupled device (CCD). An objective optical system including a plurality of lenses and the like is provided on the distal end side of the insertion portion. In this objective optical system, the distance from the subject to the image plane varies depending on the observation site of the living body or machine to be observed. Therefore, to obtain a clear image, replace it with an appropriate focal length etc. There is a need to. Therefore, as this objective optical system, various ones having different focal lengths are prepared in advance, and a configuration having an attaching / detaching mechanism has been developed so as to be detachably attached to the distal end side of the insertion portion.

By the way, generally, as the attaching / detaching mechanism, for example, in a direct-viewing type, a male screw portion is provided on the outer peripheral surface side of the adapter body accommodating the objective optical system, and a female screw portion is provided on the inner peripheral surface side of the mounting ring provided on the distal end side of the insertion portion. It is known to have a configuration. The attachment / detachment mechanism prevents the adapter body from rotating because the optical fiber bundle for the light guide or the like cannot be directly rotated to screw the adapter body into the distal end side of the insertion section. Since the optical fiber bundle does not pass through the center of the adapter body, the mounting ring is rotated while the adapter body is fixed, and the female screw on the tip inner peripheral surface side is attached to the adapter body side. It is designed to be attached by screwing it onto the male thread. Prior to this mounting operation, an optical fiber bundle provided by protruding a certain amount from the tip end side of the insertion portion is inserted into an insertion hole formed at a predetermined position of the adapter body.

[Problems to be solved]

By the way, a side-viewing type endoscope having such a detaching mechanism for the imaging lens system has also been developed, and in this case, the outer peripheral surface side dimension of the adapter body is relatively long, and therefore, this detachable Since the fixing operation of the adapter main body can be easily performed during operation, there is no problem so much. However, in the case of the direct-view type, the dimension of the outer peripheral surface of the adapter body is particularly short,
The operation when fixing the outer peripheral surface side with a finger or a jig is extremely difficult.

Therefore, in view of the above-mentioned conventional drawbacks, the present invention provides a coupling of an endoscope that can securely fix and grasp the adapter body even when the outer peripheral surface side has a short dimension when attaching or detaching the adapter body. It is an object to provide an optical system attaching / detaching mechanism.

[Means for Solving the Problems]

That is, the present invention relates to an objective optical system adapter attaching / detaching mechanism of an endoscope in which an adapter body accommodating an objective optical system is detachably attached to a distal end side of an insertion portion through an attachment ring.
A concave portion is provided at a predetermined position on the outer peripheral surface side of the adapter body, and a fixing means such as a jig is locked in the concave portion to attach and detach the adapter body.

[Action]

The endoscope objective optical system adapter attachment / detachment mechanism of the present invention uses a concave portion provided on the outer peripheral surface as a clue, that is, by fixing and fixing a jig or the like to the concave portion, the outer peripheral surface is round and slippery. The side can be securely fixed.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 3 show an objective optical system adapter attachment / detachment mechanism for an endoscope according to the present invention. This attachment / detachment mechanism is applied to a direct-view endoscope, and the distal end portion of the insertion part 1 is shown. It has a male screw portion 1a on the outer peripheral surface side. The adapter body 3 accommodating the imaging lens system 2 has a recess 4 on the outer peripheral surface side thereof,
A mounting ring 5 is attached to the adapter body 3 so as to be rotatable and axially immovable. The mounting ring 5 has a female screw portion 5a on the inner peripheral surface side of the base end portion, which is screwed into the male screw portion 1a on the insertion portion 1 side.

In order to allow the operator to visually confirm that the attachment ring 5 has been completely tightened to the insertion portion 1 side, the insertion portion 1 and the attachment ring 5 of this embodiment have male screw portions, respectively. Marks 6 are printed on the tip outer peripheral surface side and the outer peripheral surface side base end portion on the rear side of 1a.

The adapter body 3 has an illumination window 3a and an observation window 3b on the tip side.
Although the length dimension exposed on the outer peripheral surface side is shorter than that of the side-view type, the use of the recess 4 enables the fixing operation to be performed reliably and easily. There is.

The concave portion 4 is provided so that the concave portion 4 can be easily and surely fixed even if the length dimension of the exposed surface portion on the outer peripheral surface side of the adapter main body 3 is short as in the direct view type. In this embodiment, as shown in FIG. 3, one portion on the outer peripheral surface side of the adapter body 3 has a notched shape with a substantially bow-shaped cross section. As shown in FIG. 4, the concave portion 4 of this embodiment can be easily fixed by a fixing means such as a jig 6 provided with an engaging portion 6a that engages with the concave portion 4. ing.

The concave portion of the present invention is not particularly limited to that of this embodiment, and may have a shape that can be easily grasped by a finger so that it can be fixed with a finger or the like without using a jig, for example. Further, the number of the operation grooves to be formed is not limited to one, and one operation groove may be formed at each of two antipodal points, or three or more operation grooves may be formed.

Further, the concave portion may coincide with the end face as shown in FIG. 5, and in this case, a jig can be easily attached and fixing by hand becomes easy.

〔effect〕

As described above, according to the objective optical system adapter attachment / detachment mechanism for an endoscope according to the present invention, the recess formed on the outer peripheral surface side of the adapter body is used as a clue, and a jig that engages with the recess is used, for example. The adapter body can be easily fixed by touching it with a finger or the like, so it can be securely and easily fixed especially to the adapter body with a short outer peripheral surface side exposed portion such as a direct-view type. This makes it possible to improve the workability of exchanging the objective optical system and shorten the time required for the exchanging work, which is effective.

[Brief description of drawings]

FIG. 1 is a sectional view showing an objective optical system adapter attachment / detachment mechanism for an endoscope according to the present invention, FIG. 2 is a side view of the optical adapter attachment / detachment mechanism shown in FIG. 1, and FIG. 3 is an attachment / detachment shown in FIG. FIG. 4 is a front view showing the mechanism, FIG. 4 is an explanatory view showing a state in which a jig is fixed to the attachment / detachment mechanism of the endoscope according to the present invention, and FIG. 5 is a modification of the concave portion according to the present invention. FIG. 1 ... Insertion part, 2 ... Coupled lens system, 3 ... Adapter body, 4 ... Recessed part, 5 ... Mounting ring, 6 ... Jig (operating means).

Claims (1)

[Scope of utility model registration request] 1. An objective optical system adapter attachment / detachment mechanism for an endoscope in which an adapter body containing an objective optical system is detachably attached to a distal end side of an insertion portion by a predetermined outer peripheral surface side of the adapter body. An objective optical system adapter attachment / detachment mechanism for an endoscope, wherein a concave portion is provided at a position, and a fixing means such as a jig is locked in the concave portion to attach / detach the adapter body.