JPH09262203A - Eye-piece apparatus of endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the outer diameter of a diopter adjusting ring and to make needless for a diopter adjusting ring and a top ring to be joined to a state overlapped. SOLUTION: A lens barrel 22 is mounted as freely slidable but exclusively in the direction of the optical axis in a tubular body 21, a revolving ring 27 is arranged along the optical axis of the lens barrel 22 and a diopter adjusting ring 29 is engaged to the tubular body 21 as rotatable around the tubular body 21 and further the top of the diopter adjusting ring 29 is in contact with a top ring 23 screwed into the top part of the tubular body 21. The revolving ring 27 is connected to the diopter adjusting ring 29 with a connecting pin 30 and is interlocked. A pushing projection 28 is projectingly formed on the revolving ring 27, a cam 32 is formed on the top part of the lens barrel 22 and also a presser spring 34 for pressing the lens barrel 22 to the direction of the pushing projection 28 by the cam 32 thereby the diopter adjusting ring 29 is revolved.

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 a diopter adjusting mechanism for an eyepiece lens.

[0002]

2. Description of the Related Art In an optical endoscope, an eyepiece device is connected to a main body operating portion, and the eyepiece device having the structure shown in FIG. 3 has been conventionally used. That is, the cylindrical main body 1 is connected to the main body operating portion 2 of the endoscope, and the lens barrel 4 having the eyepiece 3 mounted therein is inserted into the cylindrical main body 1. An image guide 5 for transmitting an image of a body cavity or the like extends from the main body operating section 2 into the cylindrical main body 1, and the eyepiece 3 is provided so as to face the end surface of the image guide 5. .

Here, in order to enable the diopter adjustment in the eyepiece lens 3, the lens barrel 4 is movable in the optical axis direction within the tubular main body 1. The diopter is adjusted by adjusting the distance between the guide 5 and the end surface. The diopter adjusting mechanism includes a diopter adjusting ring 6 fitted to the cylindrical main body 1 and rotatable by a manual operation, and a cam cylinder 7 inserted inside the diopter adjusting ring 6. The cam barrel 7 rotates in conjunction with the diopter adjustment ring 6. A cam pin 8 is projectingly provided on the lens barrel 4, and the cam pin 8 is inserted into a through hole 1a formed in the cylindrical body 1 so as to be long in the optical axis direction of the eyepiece lens 3 to form a cam barrel. It is engaged with a cam groove 7 a formed in the shape 7. Further, the lens barrel 4 is provided with a spring 9 for urging the cam pin 8 in the direction of abutting the cam groove 7a.

The eyepiece is constructed as described above, and a cover ring 10 is provided to keep the inside of the eyepiece air-tight. The cover ring 10 has a cylindrical body. It is screwed into a nut 11 screwed to the tip portion of the dipstick 1 and extends to the vicinity of the tip portion of the diopter adjustment ring 6. Then, the diopter adjustment ring 6 and the cover ring 10
A seal ring 12 is attached to the joint surface of the and. A holding frame 10a is integrally formed at the tip of the cover ring 10, and a cover glass 13 is attached to the holding frame 10a.

[0005]

Here, the diopter adjustment is performed by gripping and rotating the diopter adjustment ring 6 with the fingers. The lens barrel 4 has the cylindrical body 1 and the cam barrel. Since the diopter adjusting ring 6 is further fitted after the seven are fitted in order, the outer diameter dimension of the diopter adjusting ring 6 becomes large, and the operability of the operation of rotating it becomes poor. . Further, the diopter adjustment ring 6 and the cover ring 10 are
They are joined so as to overlap each other by a predetermined length, and since a seal ring 12 is provided at this joined portion, contaminants do not enter the interior of the eyepiece portion, but the seal is formed. There is also a problem that contaminants may get into the portion in front of the ring 12, and it is extremely difficult to remove the contaminants attached to this portion.

The present invention has been made in order to solve the problems in the prior art as described above, and in the eyepiece capable of adjusting the diopter, the outer diameter of the diopter adjusting ring can be reduced. Moreover, the purpose is to minimize the number of joints where contaminants may enter.

[0007]

In order to achieve the above-mentioned object, the present invention is a lens in which a tubular main body is connected to the main body operating portion of an endoscope, and an eyepiece is mounted in the tubular main body. The lens barrel is provided by being inserted by a cam mechanism so as to be movable in the optical axis direction, and this cam mechanism is linked to the diopter adjustment ring so that the diopter adjustment ring can be rotated. Adjusts the position of the lens barrel in the optical axis direction, and is arranged in the optical axis direction with respect to the lens barrel,
A rotary ring that rotates in conjunction with the diopter adjustment ring is arranged, and the cam mechanism is formed by end face cam means formed between the lens barrel and the rotary ring. It is a thing.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to FIGS. First,
In FIG. 1, reference numeral 20 denotes an eyepiece device, and this eyepiece device 20 is connected to the main body operation unit 2 as described in the related art. The eyepiece device 20 has a tubular body 21, and the tubular body 21 is fixedly connected to the body operating portion. The end surface of an image guide (not shown) extends into the tubular body 21. Also in this respect, there is no particular difference from the configuration of the conventional art described above.

A lens barrel 22 fitted with an eyepiece lens is mounted in the tubular body 21 with almost no clearance, and a tip ring 23 is screwed into the tip portion of the tubular body 21. A cover glass 24 is attached to the tip ring 23. The lens barrel 22 is a cylindrical body 2
1 is movable in the optical axis direction, and the diopter is adjusted by displacing the lens barrel 22 along the optical axis in the direction of moving closer to or away from the end face of the image guide. For this reason, the cylindrical main body 21 is provided with a guide groove 25 elongated in the optical axis direction, and the lens barrel 22 has a guide pin 26 inserted into the guide groove 25. The lens barrel 22 is movable in the optical axis direction inside the cylindrical main body 21, and movements other than the optical axis direction are restricted.

By moving the lens barrel 22 in the optical axis direction,
In order to adjust the diopter, a rotating ring 27, one end of which is in sliding contact with the tip ring 23, is rotatably provided in the cylindrical body 21, and the turning ring 27 slides on the tip ring 23. A pushing protrusion 28 having a substantially spherical tip is provided on the surface opposite to the contact surface. Further, a diopter adjustment ring 29 is rotatably fitted to the cylindrical main body 21, and a connecting pin 30 is projectingly provided on a peripheral body portion of the rotating ring 27. The connecting pin 30 is connected to the diopter adjusting ring 29 via a long hole 31 provided in the cylindrical main body 21 in the rotational direction, as shown by an imaginary line in FIG. The tip surface of the diopter adjustment ring 29 is in contact with an annular protrusion 21a provided near the threaded portion of the tubular body 21 with the tip ring 23, and the other end of the diopter adjustment ring 29 is on the wall surface of the body operation portion 2. Abutting. Therefore, the diopter adjustment ring 29 is rotated while slidingly contacting the annular projecting portion 21a of the tubular main body 21 and the wall surface of the main body operating portion 2.

Further, a cam portion 32 is provided at the tip of the lens barrel 22. The cam portion 32 is formed integrally with the lens barrel 22 or as a separate member from the lens barrel 22, and its end face serves as an end face cam means that forms a cam face. The pushing projection 28 of the rotating ring 27 has a spherical portion at the tip thereof abutting on the cam portion 32 in a substantially point-contact state. Then, the cam portion 32 of the lens barrel 22
A spring 34 is elastically mounted between a surface on the side opposite to the side on which the ridge is formed and a retaining ring 33 fixedly provided in the tubular body 21, and the urging force of the spring 34 urges the cam portion. 32 is pressed against the pushing protrusion 28.

In this eyepiece device 20, the inside of the cylindrical main body 21 is kept gas-liquid tight due to the fact that the image guide is provided inside. Therefore, an O-ring or the like is provided between the mounting portion of the cover glass 24 on the tip ring 23 and the tip ring 23 and the end surface of the diopter adjustment ring 29, and between the diopter adjustment ring 29 and the tubular body 21. The seal ring 35 is inserted, and the insertion portion of the coupling pin 30 of the diopter adjustment ring 29 is filled with the seal material. Furthermore, a seal ring 35 is provided between the vicinity of the end of the diopter adjustment ring 29 and the main body operation unit 2.

In the eyepiece device 20 constructed as described above, by rotating the diopter adjustment ring 29, the lens barrel 22 is moved in the optical axis direction, and diopter adjustment is possible. That is, when the diopter adjustment ring 29 is rotated, the rotation ring 27 is interlocked and rotated via the connecting pin 30. As a result, the pushing protrusion 28, which is provided on the rotating ring 27 and has a spherical tip, slides along the cam portion 32 of the lens barrel 21 in a substantially point contact state. Here, the cam shape of the cam portion 32 is linear as shown in FIG.
In FIG. 1, the cam portion 32 is pressed against the pushing protrusion 28 by the urging force of the spring 34. Therefore, by changing the contact position between the pushing protrusion 28 and the cam portion 32, the lens barrel 2
1 is displaced in the optical axis direction. And the lens barrel 21 is
Even if the cam is not fitted in the tubular body 21, the guide pin 26 is engaged with the guide groove 25 of the tubular body 21 to restrict movement in a direction other than the optical axis direction. Even when the portion 32 and the pushing protrusion 28 are in a substantially point contact state, they are surely moved in the optical axis direction and only in the optical axis direction in association with the rotation of the rotation ring 27.

As described above, by rotating the diopter adjusting ring 29 in an appropriate direction, the lens barrel 21 is moved in the optical axis direction to perform diopter adjustment.
Since the end face of the lens barrel 21 and the end face cam mechanism arranged at the front position in the axial direction of the lens barrel 21, that is, the position near the cover glass 24, the cam barrel is provided inside the diopter adjusting ring 29. Since it is not necessary, the outer diameter dimension of the diopter adjustment ring 29 can be shortened accordingly. Therefore, the operability of the diopter adjustment performed by gripping the diopter adjustment ring 29 with fingers is improved. Also, the diopter adjustment ring 29
Has its end face abutting on the annular protrusion 21a of the tubular main body 21 and the seal ring 35 interposed therebetween, but unlike the conventional eyepiece device shown in FIG. Since there is no member that is joined so as to overlap with the degree adjusting ring 29, it is possible to prevent the accumulation of contaminants, and even if contaminants enter, the joint surface between the diopter adjusting ring 29 and the tip ring 23 is Since it faces in the direction orthogonal to the axis, cleaning and the like can be easily performed. Of course, if the cam mechanisms are arranged side by side in the optical axis direction, the eyepiece portion 20 is correspondingly provided.
However, since it is sufficient for the rotating ring 27 to have the minimum width necessary to provide the pushing protrusion 28, it is not necessary to make the length in the optical axis direction so long. .

Although the cam portion is provided on the lens barrel side, the end surface of the rotating ring may be used as the cam portion and the pushing projection may be provided on the lens barrel side. Further, in the optical axis direction, the spring is provided on the side facing the image guide with respect to the lens barrel, and the rotating ring is provided on the opposite side, but the rotating ring is provided on the side facing the image guide. It may be arranged and the spring is arranged on the opposite side. Further, when the spring is a tension spring, it is provided on the same side as the rotating ring. In short, in order to move the lens barrel in the optical axis direction, the rotation ring that constitutes the cam mechanism for converting the movement in the rotation direction into the movement in the optical axis direction of the lens barrel is attached to the axis line of the lens barrel. By arranging them side by side in the direction, the diopter adjustment ring 29
If the outer diameter of the cam mechanism is shortened, the arrangement and shape of the cam mechanism can be set arbitrarily.

[0016]

As described above, according to the present invention, the rotating ring which is arranged in the optical axis direction with respect to the lens barrel and rotates in conjunction with the diopter adjusting ring is arranged, and the lens barrel and the lens barrel are rotated. The diopter adjusting ring in the eyepiece section is adopted by adopting a constitution in which the cam mechanism for converting the movement of the rotating ring into the movement in the optical axis direction of the lens barrel is adopted by the end face cam means formed between the moving ring and the end surface. The outer diameter can be shortened, its operability can be significantly improved, and since it is not necessary to join the diopter adjustment ring and the tip ring in an overlapping state, it is possible to prevent the accumulation of contaminants. Play.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a configuration of a cam mechanism.

FIG. 3 is a cross-sectional view of a state in which a conventional eyepiece device is attached to a main body operation unit of an endoscope.

[Explanation of symbols]

 20 Eyepiece device 21 Cylindrical body 22 Lens barrel 23 Tip ring 25 Guide groove 26 Guide pin 27 Rotating ring 28 Pushing protrusion 29 Diopter adjustment ring 30 Connecting pin 32 Cam part 32a Cam surface 34 Spring

Claims (2)

[Claims] 1. A cylindrical main body is continuously connected to a main body operation portion of an endoscope, and a lens barrel having an eyepiece mounted therein is inserted into the cylindrical main body by a cam mechanism so as to be movable in an optical axis direction. In this case, the cam mechanism is connected to the diopter adjustment ring so as to be interlockable, and the diopter adjustment ring is rotated to adjust the position of the lens barrel in the optical axis direction through the cam mechanism. A rotation ring that rotates in conjunction with the diopter adjustment ring is arranged side by side with respect to the lens barrel in the optical axis direction, and the cam mechanism is formed between the lens barrel and the rotation ring. An eyepiece device for an endoscope, characterized in that it is formed by end face cam means. 2. The rotating ring is mounted at a position in front of the lens barrel in the optical axis direction so as to be rotatable and immovable in the axial direction, and the rotating ring and the lens barrel face each other. A cam surface is formed on either one of the surfaces, and a pushing portion that abuts on the cam surface is provided on the other side. The cam surface of the lens barrel contacts the pushing portion of the rotating ring. The eyepiece device for an endoscope according to claim 1, wherein a biasing means for biasing in the contact direction is provided.