JP3180453B2 - Eyepiece of endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyepiece fixed to a main body operation part in an optical endoscope, and more particularly to a mechanism for fixing the eyepiece to the main body operation part.

[0002]

2. Description of the Related Art An endoscope observes the inside of a body cavity or the like,
It is used for performing simple treatments, etc., and is configured by connecting an insertion section to the main body operation section.This endoscope is connected to an optical endoscope and an electronic endoscope by its observation mechanism. Divided into endoscopes. In an optical endoscope, an eyepiece with a built-in eyepiece is connected to the main body operation part, and an image guide consisting of an optical fiber bundle is inserted from the tip of the insertion part to the eyepiece, and the observation target part is The image from the camera is guided to the eyepiece via this image guide, and the person who operates the endoscope can observe the inside of the body or the like by touching the eyepiece. ing.

FIG. 1 shows a conventional mechanism for connecting an eyepiece to a main body operation unit. As is apparent from FIG. 1, a connecting cylinder 2 is provided on the main body operation unit 1 side, and an image guide 3 is inserted into the connecting cylinder 2. The end of the image guide 3 is inserted into the holding tube 4, and the holding tube 4 is fitted into the positioning tube 5 so that the position of the image guide 3 can be adjusted by the set screw 6. ing.

The eyepiece 10 has a lens barrel 12 on which an eyepiece 11 is mounted.
3 is inserted. The lens barrel 12 has a drive pin 14 projecting therefrom. The drive pin 14 penetrates the main body tube 13 and is inserted into the cam groove 15 a of the cam tube 15. An operation ring 16 is connected to the cam cylinder 15. When the operation ring 16 is rotated, the drive pin 14
Moves in the front-rear direction, and the diopter of the eyepiece 11 can be adjusted. The eyepiece 10 is connected to the main body operation
2, the main body tube 13 is fitted to the connection tube 2 on the main body operation section 1 side, and the four connection screws 17 are fastened. In the figure, reference numeral 18 denotes an eccentric screw for adjusting the position of the holding cylinder 4 of the image guide 3 in the front-rear direction, 19 denotes an eccentric screw for adjusting the position of the holding cylinder 4 in the rotation direction, and 20 denotes a fixing screw. , 21 indicate set screws.

[0005]

The eyepiece 10
Since the main body tube 13 is fitted in the connection tube 2 on the main body operation unit 1 side, a predetermined clearance is provided between the main body tube 13 and the connection tube 2 in order to smoothly perform this fitting. Therefore, by this clearance, the eyepiece 10 and the main body operation unit 1,
Specifically, there is a difference in the positional relationship with the image guide 3 built in the main body operation unit 1. To this end, the positional relationship between the holding cylinder 4 and the positioning cylinder 5 is accurately adjusted by the set screw 6, and the holding cylinder 4 and the connecting cylinder 2 are adjusted.
Are adjusted accurately by the eccentric screws 18 and 19, and the main body cylinder 13 of the eyepiece 10 is connected by the connecting screw 17.
Is connected to the connecting cylinder 2 on the side of the main body operating portion 1. At this time, it is necessary to adjust the clearance between the inner surface of the main body cylinder 13 and the outer surface of the connecting cylinder 2 so as to have a uniform clearance over the entire circumferential direction. is there. Further, the alignment between the image guide 3 and the eyepiece 11 can also be performed by using the clearance between the main body tube 13 and the connecting tube 2. In this case, the clearance is Although not uniform throughout, it must be kept constant. Anyway, this clearance must be kept constant and if it goes wrong,
Aberration occurs in the image of the observation target portion obtained by the eyepiece 10, and a clear image cannot be obtained.

[0006] However, as is well known, the eyepiece 10
A camera can be mounted. For this purpose, a camera mounting cylinder 22 is provided at the distal end of the eyepiece 10. The camera mounting cylinder 22 has a bayonet coupling portion 22 a. It is designed to be provided. The operator or the like operating the endoscope often attaches and detaches the camera to and from the eyepiece 10 in order to take appropriate records during the observation. Done.
Therefore, there is a possibility that the connecting screw 17 may be loosened due to vibration or the like when the camera is attached or detached. Also, when adjusting the diopter by operating the operation ring 16, a rotational force acts on the main body cylinder 13, and depending on the direction of the force, the connecting screw 17 is used.
May be loosened. As a result, during use for a long period of time, inconveniences such as a displacement between the image guide 3 and the eyepiece 11 occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a main body operation unit of an eyepiece even if a camera is repeatedly attached and detached. In order to prevent a positional shift from occurring at the connecting portion of the optical disk.

[0008]

In order to achieve the above-mentioned object, the present invention provides an eyepiece unit having a built-in eyepiece lens connected to a connecting tube provided in an operation unit of an endoscope. An eyepiece part to be fixed, wherein the eyepiece part body and the connecting cylinder are fitted to each other, and the fitting part is fixed to the fitting part by a connecting member. to form a tapered surface respectively phase bonding, the connecting portion
The material consists of a connecting screw with a tapered head,
Form a screw hole in the member located inside the fitting portion,
A screw insertion hole is formed in the member located on the outside, and this screw
A part of the insertion hole that comes into contact with the tapered part of the connection screw head
Forming a tapered contact surface to drive the connecting screw
Therefore, press the head against the contact surface of the screw insertion hole.
The two tapered surfaces are configured to be pressed against each other .

[0009]

When the eyepiece body and the connecting tube are fitted to each other, a clearance must be provided between them to facilitate the fitting. On the other hand, in order to stabilize the state in which the eyepiece section is connected to the main body operation section, it is better not to have such a clearance. Therefore, when connecting the eyepiece main body and the connecting cylinder, a clearance is provided between them so that the fitting can be performed smoothly. In addition, when they are fitted for a predetermined length, they form a tapered surface that comes into surface contact. Therefore, they are fitted to a position where the tapered surface comes into contact, and fixed by the connecting member. As a result, the eyepiece main body comes into surface contact with the connecting cylinder and is brought into pressure contact with each other, whereby both are stabilized in the connected state. As a result, the camera is frequently attached to and detached from the eyepiece,
Even if the diopter adjustment is repeatedly performed, there is no possibility that rattling occurs at the fitting portion.

In order to keep the tapered surfaces pressed against each other, a connecting screw having a tapered head, for example, is used as a connecting member, and the connecting member is positioned on the outer side of the fitting portion. By forming a screw insertion hole in which a tapered contact surface part corresponding to the tapered part of the connection screw is formed in part, and driving the connection screw, the tapered surface of the outer member is pressed against the tapered surface of the inner member. What is necessary is just to make it apply a pressing force.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. In the figure, the same or equivalent members as those of the above-described conventional technology are denoted by the same reference numerals, and description thereof is omitted.

Reference numeral 30 denotes a connecting cylinder on the side of the main body operation unit 1, and 31 denotes a main body cylinder in the eyepiece 10.
0 and the main body cylinder 31 are different from the above-mentioned prior art in that they have tapered surfaces 30a and 31a. That is, the tapered surface 30a is formed on the outer peripheral surface of the distal end portion of the connecting cylinder 30, and the tapered surface 31a is formed on the inner surface on the back side of the main body cylinder 31, and these tapered surfaces 30a, 31a are formed.
Have the same inclination angle. Therefore, when the main body tube 31 of the eyepiece 10 is fitted into the connecting tube 30 and pushed to a predetermined position, the tapered surfaces 30a and 31a can be brought into contact with each other. Therefore, by incorporating the tapered surfaces 30a and 31a so as to be in pressure contact with each other, the stability of the eyepiece 10 in the connected state becomes extremely high, and even if the camera is frequently attached and detached, this fitting is performed. There is no danger that the optical axis of the light guide 3 and the eyepiece lens 11 will shift due to rattling of the connecting portion.

When the main body tube 31 is fitted to the connection tube 30, a connection screw 32 having a tapered head portion 32a is used to connect the tapered surfaces 30a and 31a to each other in a press-contact state. A screw hole 33 is formed in the connection cylinder 30 located on the inside, and a screw insertion hole 34 is formed in the main body cylinder 31 located on the outside. The screw insertion hole 34 is constituted by a tapered contact surface portion 34a that matches the angle of the tapered portion of the head portion 32a of the connection screw 32, and a non-contact surface portion 34b that does not contact the head portion 32a. The contact surface portion 34a occupies approximately 180 ° on the distal end side of the main body tube 31. Further, three fastening positions of the connection screw 32 are provided by changing the position in the rotation direction by 120 ° in the circumferential direction.

By configuring the main body cylinder 31 in this manner, the main body cylinder 31 is attached to the connecting cylinder 30 by the tapered surfaces 30a, 3a.
When the connection screw 32 is screwed into the screw hole 33 by fitting to the position where the first screw 1a contacts, the head 32 of the connection screw 32
a enters the screw insertion hole 34 of the main body cylinder 31 and comes into contact with the contact surface 34 a of the screw insertion hole 34. Then, the more the connection screw 32 is driven, the more the head 32a is pressed against the contact surface portion 34a, and the force for pushing the main body cylinder 31 in the direction indicated by the arrow A in FIG. Further, since the connecting screw 32 is screwed into the connecting cylinder 30, the reaction force thereof
The connecting cylinder 30 is pushed in the direction of arrow B. Therefore, the tapered surface 31a of the main body tube 31 is pressed against the tapered surface 30a of the connecting tube 30, and both are brought into a surface contact state, and the stability is significantly improved. In addition, since the connecting screws 32 are provided at three positions with a phase difference of 120 °, a uniform force acts on each of the connecting screws 32 when an external force is applied. Stability is obtained.

Therefore, even if the camera is frequently attached and detached to and from the bayonet connection portion 22a of the camera mounting cylinder 22 and the attachment and detachment is performed roughly violently, the eyepiece can be adjusted even when performing operations such as diopter adjustment. There is no risk that the ten eyepieces 11 will be displaced with respect to the image guide 3. Further, a set screw 35 is screwed into a portion of the outer surface of the main body cylinder 31 where the tapered surface 31a is formed, and this set screw 3
The stability is further improved if the tip of 5 is engaged with the tapered surface 30a of the connecting cylinder 30. Moreover, if the screwing direction of the set screw 35 at the time of screwing is set to the opposite direction to that of the connecting screw 32, when a force acts in a direction in which the connecting screw 32 is loosened, a force in a direction in which the set screw 35 is screwed is applied. Therefore, the set screw 35 can exhibit a lock function of preventing the connection screw 32 from being loosened.

As described above, the fact that the main body tube 31 on the eyepiece portion 10 side and the connecting tube 30 on the main body operation portion 1 side are connected by surface contact means that only the two are connected, The axis of the eyepiece 10 can be made to follow the main body operation unit 1 without performing adjustment. That is, the optical axis of the eyepiece 12 is exactly aligned with the axis of the eyepiece 10, and the holding cylinder 4 of the image guide 3 is
The eyepiece section 10 can be accurately aligned with the axis of the positioning cylinder 5 by means of
The main body tube 31 is fitted to the connection tube 30 so that the connection screws 32
, The optical axis of the eyepiece 11 and the optical axis of the image guide 3 immediately become coincident. As a result, when the eyepiece unit 10 is separated from the main body operation unit 1 due to maintenance or the like, when the assembly is performed again, it is not necessary to adjust the position of the eyepiece lens 11 and the image guide 3 again. It will be excellent.

In the above-described embodiment, the structure in which the main body tube 31 of the eyepiece unit 10 is fitted to the connecting tube 30 of the main body operation unit 1 has been described.
The main body tube may be configured to be inserted into the connection tube. In this case, a tapered surface on the tip outer surface of the main body tube is a member located on the inside, in the direction of the coupling tube located outside, you configured to form a tapered surface on the inner surface back side.

[0018]

Since the present invention is constructed as described above, in order to smoothly connect the eyepiece to the main body operation part, a clearance is provided at the fitting part of the eyepiece body to the connecting cylinder. Also, it is possible to stably fix both in a state where they are brought into surface contact, and there is no danger that the connecting portion of the eyepiece to the main body operation unit will be loose due to operations such as frequently attaching and detaching the camera. And so on.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a connecting mechanism for connecting an eyepiece to a main body operation unit according to the related art.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a cross-sectional view of a mechanism for connecting an eyepiece to a main body operation unit according to an embodiment of the present invention.

FIG. 4 is a sectional view taken along line YY of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body operation part 3 Image guide 10 Eyepiece part 11 Eyepiece lens 12 Lens barrel 30 Connection cylinder 31 Main body cylinder 30a, 31a Tapered surface 32 Connection screw 32a Head 33 Screw hole 34 Screw insertion hole 34a Contact surface 34b Non-contact Face part 35 set screw

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B 23/26 A61B 1/00 300 G02B 23/24 G02C 7/02

Claims (1)

(57) [Claims] 1. A connecting cylinder provided in a main body operation section of an endoscope,
In the eyepiece part which is fixed by connecting the eyepiece part body incorporating the eyepiece lens, the eyepiece part body and the connecting cylinder are fitted together, and the two are connected to each other by a connecting member at this fitting part. , And in this fitting part,
Form a tapered surface to be joined to each other , and connect the connecting member
Consisting of a connection screw having a tapered head,
A screw hole is formed in the member located inside the fitting part,
A screw insertion hole is formed in the member located at
Taper that abuts part of the hole with the tapered part of the connection screw head
Forming a contact surface in the shape of
And press the head against the contact surface of the screw insertion hole.
An eyepiece of an endoscope, characterized in that the two tapered surfaces are pressed against each other .