JPH0618788A - Eyepiece device for endoscope - Google Patents

Abstract

PURPOSE:To firmly fix a cover glass attached to an eyepiece window by using a clamp ring and to more surely keep the airtightness of the attaching part of the cover glass. CONSTITUTION:The eyepiece window 20 is provided on the end part of a cylindrical main body 11, the cover glass 21 is attached to the window 20, and the constitution of the window 20 is a level difference constitution constituted of a circular inside peripheral wall and an annular abutting wall which is formed on a part on the outside of the inside peripheral wall and which turns inward. The clamp ring 23 in which an inward bonding surface parts are successively set on the one end of the cylindrical part from inside is screwed in a state where the cover glass 21 is inserted and fitted to the window 20, the cover glass 21 is held between the bonding surface part of the clamp ring 23 and the abutting wall of the window 20, and a sealing material is allowed to intervene between them so that the cover glass 21 may be extremely stable and the airtightness is kept enough.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyepiece device for an endoscope, and more particularly to an airtight structure of the eyepiece device.

[0002]

2. Description of the Related Art In an optical endoscope, an eyepiece device is connected to a main body operation section. This eyepiece device has a lens barrel having an eyepiece mounted in a cylindrical body. An eyepiece window is formed at the end of the tubular body. A cover glass is attached to the eyepiece window to keep the inside airtight. To mount the cover glass, a step is provided on the inner peripheral wall portion of the tubular body where the eyepiece window is formed, and a ring-shaped rising wall is formed on the inner side portion of the cylindrical body, so that the cover glass can be changed from the outside to the eyepiece window. It is inserted and fitted so as to abut against this rising wall, and the cover glass is fixed and the inside of the tubular main body by interposing an adhesive at the joint surface portion between this cover glass and the wall surface of the tubular main body. I try to keep it airtight.

[0003]

The joint surface between the cover glass and the cylindrical body is the joint surface between the outer peripheral surface of the cover glass and the rising wall thereof, and a sufficient joint surface cannot always be obtained. There is a problem that the integrity of can not be maintained. Moreover, when the cover glass is attached to the eyepiece window, it is only fixed with an adhesive and cannot be sufficiently stabilized in the fixed state. There is also a problem that there is a possibility that

The present invention has been made to solve the problems in the prior art as described above, and makes it possible to keep the cover glass in an extremely stable state and surely in an airtight state. That is the purpose.

[0005]

In order to achieve the above object, the eyepiece device of the present invention has an annular shape in which the outer surface of the cover glass is in contact with the peripheral wall portion forming the eyepiece opening of the cylindrical main body. Tightening with a stepped structure with abutting walls, a thread groove provided on the inner surface of the inner wall of the peripheral wall, a threaded portion formed on the outer surface of the peripheral body, and an inward joint surface formed on the tip. By screwing the ring into the thread groove, the cover glass is sandwiched between the joint surface portion of the tightening ring and the contact wall, and a sealing material is provided on the contact surface between the cover glass and the wall portion and the tightening ring. It is characterized in that it is configured to be filled with.

[0006]

With this structure, the joint surface portion of the cover glass becomes the joint surface portion of the contact wall of the cylindrical main body and the tightening ring in addition to the outer peripheral surface thereof, so that the joint area becomes extremely large. Therefore, by interposing a sealant on all the contact surfaces of the cover glass, the inside of the cylindrical main body can be surely kept airtight. Moreover, since the cover glass is sandwiched between the contact wall and the joint surface portion of the tightening ring, the cover glass is securely and firmly fixed.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows the entire configuration of the eyepiece device for an endoscope, and FIG. 2 shows an enlarged cross-section of a cover glass mounting portion.

In the figure, reference numeral 1 denotes a main body operating section, and an eyepiece device 10 is connected to the main body operating section 1. A connection cylinder 2 is provided so as to project from the main body operation unit 1 side, and an image guide holder 4 having an image guide 3 inserted therein is inserted and fixed inside the connection cylinder 2. Further, the tubular body 11 of the eyepiece device 10 is fitted and fixed to the connecting tube 2. A lens barrel 13 to which the eyepiece lens 12 is attached is provided inside the cylindrical body 11 so as to be slidable along the inner surface thereof.

The lens barrel 13 is movable in order to adjust the diopter by displacing the eyepiece lens 12 along the optical axis of the eyepiece lens 12 toward and away from the end face of the image guide 3. is there. For this purpose, the lens barrel 1
3 is provided with a cam pin 14 projecting from the cam pin 1.
Reference numeral 4 penetrates a long groove 15 provided in the tubular body 11 and is fitted into a cam groove 17 in a cam ring 16 rotatably provided in the tubular body 11. And this cam ring 16
An operation ring 18 is connected to the cam ring 16. When the operation ring 18 is rotated by a finger, the cam ring 16 rotates following the operation ring 18 to slide the lens barrel 13 along the inner surface of the tubular body 11. It will be displaced. Reference numeral 19 is a spring that urges the lens barrel 13 into contact with the cam groove 17.

An eyepiece window 20 is provided at the end of the cylindrical main body 11, and a cover glass 21 is attached to the eyepiece window 20. The eyepiece window 20 has a circular inner peripheral wall 20a, and an annular contact wall 20b is formed inward at a portion outside the inner peripheral wall 20a. The contact wall 20b has a width dimension as long as possible within a range that does not obstruct the visual field from the eyepiece lens 12. Also, the tubular body 1
A thread groove 22 is formed on the inner surface of the inner surface of the portion 1 where the eyepiece window 20 is provided.

Next, reference numeral 23 denotes a tightening ring, which has a cylindrical portion 23a, and one end of the cylindrical portion 23a is provided with an inwardly facing joint surface portion 23b. Here, the cylindrical portion 23a has a thread groove 2 on its outer peripheral surface.
A screw portion 24 to be screwed into 1 is formed, and the inner diameter is larger than that of the lens barrel 13. The tightening ring 23 having the above-described configuration is screwed into the thread groove 22 in a state where the cover glass 21 is fitted into the eyepiece window 20, so that the cover glass 21 is secured to the tightening ring 23.
Abutting wall 20b in the eyepiece window 20 and the joint surface portion 23b of the
It is configured to be held between and. Then, the contact wall 20b and the inner peripheral wall 20 in the cover glass 21.
a contact portion with a and a joint surface portion 23b of the tightening ring 23
A sealing material 25 is filled between the contact surfaces 20 and and, and a sealing member 26 made of an elastic material such as an O-ring is mounted between the outer surface of the cover glass 21 and the contact wall 20b. Further, the space formed by the tightening ring 23, the cover glass 21, and the tubular body 11 is used as a reservoir for the sealing material 26, or a sealing member 27 made of an annular elastic member is provided in this space. May be attached.

The present embodiment is constructed as described above, and in assembling the eyepiece device 10 to the main body operating portion 1, first, the seal material 25 is applied to the inner peripheral wall 20a and the contact wall 20b in advance. In addition, the seal member 26 and, if necessary, the seal member 27 are attached in advance. In this state, the cover glass 21 is inserted from the inside of the tubular main body 11, the cover glass 21 is fitted to the inner peripheral wall 20a of the eyepiece window 20, and is brought into contact with the contact wall 20b. After that, the tightening ring 23 is inserted from the inside of the tubular main body 11, and the screw portion 24 provided on the cylindrical portion 23 a is screwed into the thread groove 22. Bonding surface portion 23 of this tightening ring 23
The seal material 25 is applied to b in advance. When the tightening ring 23 is driven in by a predetermined amount, the joint surface portion 23b comes into contact with the inner surface of the cover glass 21 and the cover glass 2
1 is pushed in the direction of pressing against the contact wall 20b.

As a result, the cover glass 21 is fixed while being sandwiched between the contact wall 20b and the joint surface portion 23b. In addition, they are in close contact with each other via the sealing material 25, and the sealing member 26 (when the sealing member 27 is provided, this sealing member 27
It also bends and exerts a sealing function. in this way,
On both the front and back surfaces and the end surface of the outer peripheral portion of the cover glass 21,
The sealing material 25 is interposed in the largest possible area within the range that does not obstruct the visual field of the eyepiece lens 12.
In addition, since the seal members 26 and 27 having elasticity are mounted, the mounting portion of the cover glass 21 is kept completely airtight. Moreover, since the cover glass 21 is firmly fixed, even if external force is applied to it,
There is no possibility that airtight leakage will occur due to separation from the sealing material 25. Further, the eyepiece 1 on the outer surface of the cover glass 21
Since the contact wall 20b covers a region unnecessary for the second field of view, the portion of the cover glass 21 in contact with the outside air can be reduced, and the occurrence of fogging can be reduced.

When the cover glass 21 is mounted as described above, the spring 19 and the lens barrel 13 are attached to the cylindrical main body 11.
Is mounted, the cam ring 16 is fitted to the lens barrel 13, the cam pin 14 is mounted, and the operation ring 18 is attached to assemble the eyepiece device 10, and the eyepiece device 10 is connected to the connection tube 2 of the main body operation unit 1. But for these,
As in the conventional technique, an appropriate method can be used, and thus a detailed description thereof will be omitted.

In this way, the eyepiece device 1 is attached to the main body operation unit 1.
0 is connected, but the eyepiece device 10 is designed to keep the inside airtight by the seal members S provided at required positions in FIG. In conjunction with this, the portion of the eyepiece window 20 to which the cover glass 21 is attached has the structure described above that is completely airtight, and therefore is in communication with the inside of the eyepiece device 10. The inside of the main body operation unit 1 can be kept completely airtight, and the cleaning liquid and the like do not enter inside when the endoscope is immersed in the cleaning liquid to clean the endoscope. Moreover, since the surface of the cover glass 21 is exposed to the outside, there is an opportunity to apply an external force to separate it from the eyepiece window 20 and the sealing material 25 may come into contact with a contaminant or the like. However,
Since the cover glass 21 is sandwiched between the abutment wall 20b and the joint surface portion 23b, there is no risk of peeling, and the front and back surfaces of the cover glass 21 are attached to the abutment wall 20b and the joint surface portion 23b by the action of the tightening ring 23. Since it is in close contact with, there is no risk of contaminants entering between them.

By the way, when an endoscope is used, the diopter adjustment is appropriately performed according to the operator. For this diopter adjustment, the operation ring 18 is rotated and the lens barrel having the eyepiece lens 12 is mounted. This is done by moving 13 along the inner surface of the tubular body 11. Since the tightening ring 23 is located between the lens barrel 13 and the eyepiece window 20, the tightening ring 23 causes the lens barrel 13 to move.
Movement must not be restricted. However,
Since the inner diameter of the cylindrical portion 23a of the tightening ring 23 is formed larger than the outer diameter of the end portion of the lens barrel 13,
The lens barrel 13 can be displaced to a position closest to the cover glass 21 without interfering with the tightening ring 23. Therefore, the tightening ring 23 is attached to the lens barrel 1.
3 is provided between the eyepiece device 3 and the eyepiece window 20 in order to secure the movement stroke of the lens barrel 13.
It is not necessary to increase the length in the 0 axis direction.

[0017]

As described above, according to the present invention, the cover glass to be mounted on the eyepiece window of the cylindrical main body has the mounting portion having a step structure, and the outer surface of the cover glass is in contact with the contact wall. Is formed, and is fixed in a state of being sandwiched between this and the joining surface formed on the tightening ring, and the joining of the abutment part and the tightening ring with the stepped wall portion of this cover glass Since the sealing material is interposed between the surface and the surface, the cover glass can be held in an extremely stable state, and the area for mounting the sealing material to keep the inside airtight can be widened. When the entire endoscope including the eyepiece device is immersed in the cleaning solution for cleaning, the cleaning solution can be reliably prevented from entering the inside.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a state in which an eyepiece device according to an embodiment of the present invention is attached to a main body operation unit of an endoscope.

FIG. 2 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body operation part 10 Eyepiece device 11 Cylindrical main body 20 Eyepiece window 20a Inner peripheral wall 20b Abutment wall 21 Cover glass 22 Screw groove 23 Tightening ring 23a Cylindrical part 23b Joint surface part 24 Screw part 25 Seal material 26, 27 Seal member

Claims (2)

[Claims] 1. A lens barrel having an eyepiece mounted therein is movably arranged in the optical axis direction in a cylindrical main body connected to a main body operation section of an endoscope, and is attached to an end of the cylindrical main body. In an eyepiece device in which an eyepiece opening is provided and a cover glass is attached to the eyepiece opening, a peripheral wall portion forming the eyepiece opening of the tubular main body has a circular ring-shaped contact with an outer surface of the cover glass. A tightening ring that does not have a step structure with a contact wall, has a thread groove on the inner surface of the inner wall of the peripheral wall, has a threaded portion on the outer surface of the peripheral body, and forms an inward joint surface at the tip. The cover glass by sandwiching the cover glass between the joint surface portion and the contact wall of the tightening ring, and a sealing material is attached to the contact surface between the cover glass and the wall portion and the tightening ring. It is characterized by being configured to be filled Endoscope eyepiece device. 2. The eyepiece device for an endoscope according to claim 1, wherein a seal member is attached to the inner surface of the contact wall.