JP3021288B2 - Endoscope eyepiece structure - 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 for an endoscope, and more particularly, to a mounting structure for an operation ring of an eyepiece in which a mechanism for adjusting diopter is incorporated.

[0002]

2. Description of the Related Art An endoscope apparatus has a scope using an optical fiber, and an eyepiece is arranged on an operation section of the scope. The end of the scope is inserted into a body to be observed such as a body cavity. When inserted, the object to be observed can be observed through the eyepiece. In this type of endoscope, a diopter adjustment mechanism for adjusting diopter with a rotating operation ring is provided in an eyepiece.

FIG. 4 shows a configuration of a conventional eyepiece, in which the eyepiece 1 is viewed from the right arrow direction 100. A lens unit 3 holding a lens is disposed inside the mount ring 2 at the tip (right side in the figure) of the eyepiece unit 1, and the lens unit 3 is urged to the left side in the figure by a spring 4. The pin 5 is fixed to the lens unit 3. On the other hand, an operation ring 6 for adjusting diopter is provided on an outer peripheral portion of the eyepiece 1, and a cylindrical cam 7 is fixed to the operation ring 6 so as to rotate integrally. A cam groove 8 is formed in the cylindrical cam 7 in the circumferential direction, and the pin 5 is engaged with the cam groove 8. Therefore, when the cylindrical cam 7 is rotated by the operation ring 6, the pin 5 moves in the left-right direction in the figure by the guide of the cam groove 8. As a result, the lens unit 3 moves in the optical axis direction, and the diopter can be adjusted by a slight movement of the lens unit 3.

In such an eyepiece 1, the connection and fixation of the operation ring 6 and the cylindrical cam 7 are performed by, for example, a slit structure. That is, FIG. 5 shows the operation ring 6 of FIG.
Also, a view in which the cylindrical cam 7 is cut along the line V-V is shown, but a slot 9 shown in the figure is formed at the end of the cylindrical cam 7, and the slot 9 has an operating ring 6. The protrusion at the end is fitted. The operation ring 6 is prevented from being displaced in the axial direction by the press ring 10 shown in FIG.

[0005]

However, in the above-mentioned fixing of the operating ring and the cylindrical cam at the eyepiece, the height H of the groove of the slot 9 may be large due to the structure of the eyepiece 1. However, there was a problem that the connection strength was low and the durability was low. On the other hand, in order to increase the connection strength, it is conceivable to fix the operation ring 6 and the cylindrical cam 7 with a metal screw. However, according to this screw fixing, since the screw is exposed at the outer peripheral portion, it is necessary to provide electrical insulation, and it is not preferable to make the appearance beautiful.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent a screw from being exposed to an outer peripheral portion when a strong fixing state is obtained by using the screw. To provide an endoscope eyepiece structure that can be realized with a simple structure.

[0007]

In order to achieve the above object, the present invention transmits an image of an object to be observed from a distal end portion of an endoscope.
The image guide for the screw via the holding member
And a lens that is optically connected to this image guide.
Inner cylinder for movably supporting's portion in the optical axis direction, and the cylindrical cam for diopter adjustment of the lens <br/>'s section, is disposed on the outer periphery of the cylindrical cam, rotates the cylindrical cam Operating ring and the eyepiece end side of the inner cylinder adjacent to this operating ring
An endoscope eyepiece having a mount ring disposed on an outer periphery of the eyepiece.
Fixed by screws in the side, in a state in which sink into the inside of the mount ring adjacent the operating ring side screw fixing portion, rotatably attached to the cylindrical cam and the operating ring to the inner tube, the image guide Hold the holding member
The outer periphery of the screw fixing part on the image guide side fixed with a screw to the cylinder
Slidable in the direction of the optical axis.
Slide between the operating ring and the cylindrical cam
A space for retracting the outer peripheral ring is provided .

[0008]

According to the above arrangement, a metal screw or the like is used.
Since the cylindrical cam and the operation ring are connected, a strong fixed state can be obtained. The outer diameter of the screw fixing portion is smaller than the inner diameter of the adjacent mount ring.
By sliding the cylindrical cam and the operation ring toward the mount ring, the screw fixing portion is housed inside the mount ring. Thereafter, the cylindrical cam and the operation ring are fixed by a holding ring or the like, and the screw is assembled in a state of being hidden in the mount ring. Also, in the space between the operating ring and the cylindrical cam,
Slides and retracts, providing image guidance.
The screws that fix the metal holding member and the inner cylinder are exposed.
This facilitates attachment and detachment of the screw.

[0009]

FIG. 1 shows the configuration of an endoscope eyepiece according to an embodiment. An eyepiece 12 is connected to an endoscope operation unit 13 on the left side of the figure and is indicated by an arrow on the right side. It is configured to peek from direction 100. At the tip (right side) of the eyepiece 12, a mount ring (outer ring) 15 is connected to the inner cylinder 16,
A camera can be connected to the mount ring 15. A lens portion 17 holding a plurality of lenses is disposed together with a spring 18 inside the inner cylinder 16.
The lens portion 17 is urged by a spring 18 to the left in the figure. As in the above-described conventional configuration, a pin 20 is fixed to the lens portion 17, and the pin 20 is attached to the inner cylinder 1.
6 is engaged with an axial groove 21 formed in the same.

On the other hand, an operation ring 22 for adjusting the diopter is provided on the outer peripheral portion of the eyepiece 12, and a cylindrical cam 23 fixed integrally is disposed inside the operation ring 22, and these are rotatable. It is attached. And this cylindrical cam 2
3 is provided with a cam groove 24 with which the pin 20 is engaged. That is, FIG. 2 shows the configuration of the cylindrical cam 23. As shown in FIG.
The shape is slightly inclined up to 2. Therefore, when the cylindrical cam 23 rotates, the pin 20 and the lens unit 17 urged to the left side in FIG.
Is moved by a small amount in the axial (left / right) direction due to the inclination of the cam groove 24 from the position P1 to the position P2, whereby the diopter can be adjusted.

Then, in order to rotate the cylindrical cam 23, the operating ring 22 is connected and fixed by a metal screw 27. As shown in FIG. , A screw hole 26 is formed. In the embodiment, the screws 27 are screwed into three screw holes (26) formed around the operation ring 22 and the cylindrical cam 23, thereby fixing them. The outer diameter of the screw fixing portion of the operation ring 22 is formed slightly smaller than the inner diameter of the mount ring 15 as shown in FIG. It has become so. Further, in order to prevent the cylindrical cam 23 from moving in the axial direction, a pressing ring 28 is provided, and an outer peripheral ring 29 is arranged behind the operating ring 22. Then, this outer ring 29
Inside, a holding member 31 for holding an image guide (optical fiber) 30 is attached to the inner cylinder 16 with a screw 32.

FIG. 3 shows a part of an assembling process of the eyepiece section 12. First, as shown in FIG. 3A, a lens section 17 is attached to an inner cylinder 16 to which a mount ring 15 is attached.
And the pin 20 is attached to the lens unit 17 via the groove 21. Next, the cylindrical cam 23 and the cam groove 24 are
0, and the operation ring 22 is
Fit. Then, the operation ring 22 is
And the cylindrical cam 23 are connected and fixed at these ends as shown in the figure. When the connection between the operation ring 22 and the cylindrical cam 23 is completed, as shown in FIG. 3 (B), they are slid so that the screw fixing portion is sunk inside the mount ring 15, and the cylindrical cam 23 is held by the press ring 28. 23 Fix the rear end side.

Thereafter, the outer peripheral ring 29 is attached. First, the outer peripheral ring 29 is moved to a space between the operation ring 22 and the cylindrical cam 23, and in this state, FIG.
As shown in (C), a holding member 31 holding the image guide 30 is fixed with screws 32. Thereafter, the outer peripheral ring 29 is moved to the rear end side, and is fixed at the position shown in FIG.

In this manner, the eyepiece 12 is assembled. As described above, the operation ring 22 and the screw fixing portions of the cylindrical cam 23 and the screw 27 are housed inside the mount ring 15. With a simple configuration in which the screw fixing portion is sunk into the mount ring 15, the metal screw 27 is not exposed to the outside. As a result, electrical safety is ensured and the appearance is not impaired.

[0015]

As described above, according to the present invention,
A cylindrical cam and an operation ring for adjusting the diopter are fixed by screws on the eyepiece end side , and the screw fixing portion is disposed so as to be sunk inside an adjacent mounting ring, and the cylindrical cam and the operation ring are turned. since rotatably mounted, the cylindrical cam and operating ring can firmly fixed to each other, fixing screws in this case, mouse
It is possible to hide the interior with a simple configuration that causes submerge into the inside of the cement ring. Therefore, there is an advantage that electrical safety is secured and the appearance is not impaired. Ma
Also, attach the outer ring of the screw fixing part on the image guide side to the optical axis.
To be slidable in the direction
The outer ring slides between the cylindrical cam and the cylindrical cam.
The space for retracting the image guide
Installation and removal of fixing screws for the material become easy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structure of an endoscope eyepiece according to an embodiment of the present invention.

FIG. 2 is a view showing a configuration of a cylindrical cam of the embodiment.

FIG. 3 is a diagram showing a process of assembling an eyepiece according to the embodiment.

FIG. 4 is a cross-sectional view showing the structure of a conventional endoscope eyepiece.

FIG. 5 is a cross-sectional view taken along line VV showing a connection state between the operation ring and the cylindrical cam in FIG. 4;

[Explanation of symbols]

1, 12 ... eyepiece part, 2,15 ... mount ring, 3,17 ... lens part, 6,22 ... operation ring, 7, 23 ... cylindrical cam, 16 ... inner cylinder, 27 ... screw, 28 ... holding ring.

Claims (1)

(57) [Claims] An image of an object to be observed is transmitted from a distal end of an endoscope.
The image guide for the screw via the holding member
And a lens that is optically connected to this image guide.
Inner cylinder for movably supporting's portion in the optical axis direction, and the cylindrical cam for diopter adjustment of the lens unit is arranged on the outer circumference of the cylindrical cam, and an operation ring for rotating the cylindrical cam Is arranged on the outer periphery of the inner cylinder on the eyepiece end side , adjacent to this operation ring.
An endoscope eyepiece having a mounting ring , wherein the operation ring and the cylindrical cam are fixed with screws at the eyepiece end side, and the operation ring-side screw fixing portion is attached to the adjacent macroscopic lens .
In a state in which sink into the inside of the mount ring, the cylindrical cam and the operating ring rotatably mounted relative to the inner tube, and the image guide holding member and the screw fixed to the inner tube
Move the outer ring of the image guide side screw fixing part in the optical axis direction.
It is slidable and the operation ring and the
Retract the sliding outer ring between the cylindrical cam
An endoscope eyepiece structure characterized by having a space to be evacuated .