JPH0746898Y2 - Eyepiece device for endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an eyepiece device for forming an image of an observation target portion in an endoscope.

[Prior Art] An endoscope used for medical purposes and industrial purposes includes an insertion portion to be inserted into a patient's body, an inside of a mechanical device, or the like, and a main body operation portion for operating the insertion portion. It Then, in order to observe the inside of the body or the like, an eyepiece unit is continuously provided to the main body operation unit, and an image guide is inserted between the eyepiece unit and an observation window provided at the distal end of the insertion unit to observe an object to be observed. The image of the part is transmitted through this image guide and is formed by an optical system provided in the eyepiece part.

Here, in recent years, as an eyepiece, it has been desired that an optical system having a different imaging magnification can be exchanged and used, and for this reason, the emission of the image guide to the operation unit of the main body is desired. There has been proposed a structure in which an eyepiece mount portion facing the end is provided, and the eyepiece lens device is detachably attached to the eyepiece mount portion by bayonet coupling or the like. For example, in the eyepiece lens device, an annular connecting portion having a bayonet ring at the tip is continuously provided, the connecting portion is fitted to the eyepiece mount portion, and the bayonet ring is rotated to connect them. It is fixed to.

Here, in the case where the eyepiece device is exchangeably attached to the eyepiece mount portion, the distance between the image forming position of the eyepiece and the emission end face of the image guide that transmits the image of the observation target portion in each eyepiece device. Is not necessarily kept constant. Thus, if the image forming position of the eyepiece lens is deviated, it becomes impossible to focus and a clear image cannot be formed. For this reason, by screwing between the connecting portion connected to the eyepiece mount portion and the lens supporting portion that incorporates the lens barrel, the structure is such that the relative position can be adjusted in the optical axis direction,
As a result, it has been known in the related art that when an eyepiece device of a different type such as an eyepiece device having a different magnification is attached, accurate focusing can be performed.

[Problems to be Solved by the Invention] By the way, as described above, when the supporting member is divided into the lens supporting portion and the connecting portion and screwed to each other, the screwed portion is There must be no backlash, and in order to fix the lens support part and the connection part in a predetermined positional relationship, a fixing means such as a locking pin or a lock nut must be provided.
There was a problem that its structure became complicated. further,
Since it is necessary to attach a camera and various other adapters to the eyepiece lens device, a large force is applied to the screw connection part when the adapters are attached or detached, and the positional relationship between the lens support part and the connection part changes. Then, there is a problem that the image forming position may be displaced.

The present invention has been made in view of the above points, and an object of the present invention is to make an eyepiece device detachable from an eyepiece mount part and to provide an image forming position once with a simple configuration. An object of the present invention is to provide an eyepiece device for an endoscope in which the position of the eyepiece does not shift after the adjustment of the above.

[Means for Solving the Problems] In order to achieve the above-described object, the present invention provides a mounting portion for a locking pin on a main body ring and a cam ring when the cam ring is arranged at a predetermined position during shooting by a camera. A hole for pin insertion is formed in a portion corresponding to, a long groove is provided in the lens barrel in the circumferential direction, and a jig insertion hole is provided in a portion corresponding to the long groove in the cam ring, the main body ring and the operation ring.
A jig having a rod-shaped member that can be inserted into the jig insertion hole and provided with a tip portion at a position eccentric to the axis of the rod member when engaged with a long groove is used, and the lens barrel is operated by the jig. With the axial position adjusted with respect to the ring, the lens barrel is connected and fixed to the operating ring by screwing the locking pin into the operating ring through the pin insertion hole. That is the feature.

[Operation] With the configuration described above, with the eyepiece lens device mounted on the eyepiece mount, loosen the locking pin,
Insert a jig for adjusting the position of the lens barrel into the jig insertion hole, adjust the position of the lens barrel, and then tighten the locking pin to fix the eyepiece and the exit end face of the image guide. The position between the two can be adjusted accurately, and the structure of the eyepiece lens device is simplified. Also,
Since no force is applied between the lens support and the lens barrel when attaching or detaching the camera or other adapters, the position of the two may be misaligned after the image forming position is adjusted once. It disappears.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the drawings.

First, FIG. 4 shows the overall configuration of the endoscope. In the figure, 1 is an insertion part to be inserted into a body cavity of a patient, and 2 is a main body operation part for operating the insertion part 1, respectively,
A universal cord 3 connected to the light source device is connected to the main body operation unit 2.

An illumination window and an observation window are provided at the distal end portion 1a of the insertion portion 1, and the emission end of the light guide faces the illumination window. This light guide is inserted from the insertion portion 1 via the main body operation portion 2 to the universal cord 3 By connecting the universal cord 3 to a light source device (not shown), the illumination light can be emitted from the illumination window toward the observation target portion. Further, the entrance end of the image guide faces the observation window, and the image guide is guided from the insertion section 1 to the eyepiece section 4 via the main body operation section 2.

Next, FIG. 1 shows a cross section of the eyepiece 4. As is clear from the figure, the eyepiece mount 10 is integrally connected to the main body operation part 2, and the eyepiece mount 10 is a cylindrical member protruding from the end of the main body operation part 2. It is configured. An image guide is provided on the eyepiece mount 10.
An opening 10a facing the emitting end 11a of 11 is formed, and this opening 10a is closed by a transparent glass 12 for dust protection.
A connection ring 13 is screwed into the eyepiece mount portion 10, and an eyepiece device 20 having an eyepiece lens is detachably attached to the connection ring 13.

The eyepiece lens device 20 has a lens supporting portion 21 and a connecting portion 22, and the connecting portion 22 is adapted to be fitted to the connecting ring 13 on the eyepiece mount portion 10 side. Then, a bayonet ring 23 is screwed into the connecting portion 22, and a bayonet claw 14 projecting from the eyepiece mount portion 10 is inserted into a bayonet groove 23a provided in the bayonet ring 23, whereby the eyepiece lens device 20 Is fixed in a state of being connected to the eyepiece mount 10.

On the other hand, as is apparent from FIG. 2, a lens barrel 24 incorporating an eyepiece lens is attached to the lens support portion 21. The lens support portion 21 includes a body ring 25 fitted to the lens barrel 24, a cam ring 26 fitted to the body ring 25, and an outer ring 27 fitted to the cam ring 26.
A decorative ring 28 fitted to the outer ring 27, a locking ring 29 for locking the decorative ring 28, and a connecting ring 30 fitted to the tip of the main body ring 25. Further, the connecting ring 30 is provided with a bayonet mechanism for connecting an adapter such as a camera.

Here, the lens barrel 24 is movable in the optical axis direction in order to enable the diopter adjustment. For this reason, an operating ring 31 is fitted to the lens barrel 24 and fixed by locking pins 32. A drive pin 33 is attached to the operation ring 31, and the drive pin 33 is engaged with a groove cam 35 provided in the cam ring 26 via a through hole 34 formed in the main body ring 25. . A spring 38 acts on the operating ring 31 to urge the lens barrel 24 so that the lens barrel 24 is located closest to the emitting end 11a of the image guide 11. Therefore, when the cam ring 26 is rotated, the drive pin 33 moves along the grooved cam 35 of the cam ring 26, and as a result, the lens provided integrally with the operation ring 31 to which the drive pin 33 is attached. Lens barrel 24
Can move in the optical axis direction, and the position of the eyepiece lens can be changed according to the visual acuity of the operator who operates the endoscope.

However, when a camera is connected to the eyepiece lens device 20 and an image of an observation target portion is taken, the eyepiece lens must be always arranged at a fixed position in order to bring it into focus. I have to. To this end, the camera is provided with a well-known cam driving member, and when the camera is mounted, the cam driving member engages with the cam ring 26 and rotates the cam ring 26 to move the lens barrel. It is adapted to displace 24 into place.

By the way, as described above, when the camera is attached, the lens barrel 24 incorporating the eyepiece is not positioned at a certain distance from the emission end 11a of the image guide 11 so that the observation target portion is not changed. When you take a picture, the focus is out of focus and you cannot take a clear picture. However, if only a single eyepiece lens unit is attached to the eyepiece mount 10, the image guide
By adjusting the position of the emission end 11a of 11 or the like, it becomes possible to perform positioning between the two. However, since it is possible to replace and attach a plurality of types of eyepiece lens devices such as those having different imaging magnifications, the eyepiece and the emission end 11a are adjusted by adjusting the position of the emission end 11a of the image guide 11. Cannot be aligned.

Therefore, in the present invention, the position of the lens barrel 24 in each eyepiece lens device 20 is finely adjusted.

For this reason, as shown in FIG. 3, a round bar jig 40 is used to adjust the position between the lens barrel 24 and the exit end 11a of the image guide 11. ,
The tip 40a of the jig 40 is eccentric by h with respect to its axis.

A jig insertion hole 36 for inserting the jig 40 is formed in the lens support portion 21 together with a pin insertion hole 37 for tightening the locking pin 32 described above in a state where the eyepiece lens device 20 is assembled. The jig insertion hole 36 and the pin insertion hole 37 are formed in the operation ring 31, the main body ring 25, the cam ring 26, and the outer ring 27. In addition, a jig is attached to the lens barrel 24.
A long groove 41 is formed in the circumferential direction in order to insert the tip end portion 40a of 40. On the other hand, the decorative ring 28 does not have such insertion holes 36 and 37 due to its nature. Therefore, when the position of the lens barrel 24 is adjusted, the decorative ring 28 is removed.

This embodiment has the above-mentioned configuration, and an eyepiece lens device
Since 20 is connected by bayonet coupling of the eyepiece mount section 10 in the main body operation section 2, this eyepiece lens device 20 can be attached to and detached from the main body operation section 2 and an optical system having a different imaging magnification can be used. Eyepiece device having 20
Can be appropriately replaced and mounted on the main body operation unit 2. To connect the eyepiece lens device 20 to the eyepiece mount unit 10, the cutout portion in the bayonet groove 23a of the bayonet ring 23 attached to the connection ring 28 on the eyepiece lens device 20 side is connected to the eyepiece mount unit 10 side connection ring 13. The bayonet ring 23 may be rotated by fitting the connection ring 28 into the connection ring 13 of the eyepiece mount unit 10 with the bayonet claw 14 provided in the above position aligned.

In this state, the insertion portion 1 of the endoscope is inserted into the patient's body or the like, the tip portion 1a thereof is guided to a predetermined observation target portion, and the operator makes eye contact with the eyepiece lens device 20 to perform the observation. It becomes possible to observe the target part. If a camera is attached to the eyepiece lens device 20, the observation target portion can be photographed.

Here, when a camera or other adapter is attached to the eyepiece lens device 20, the eyepiece lens built in the lens barrel 24 is accurately arranged so as to be at an image forming position from the exit end surface 11a of the image guide 11. There must be. For this purpose, first, the eyepiece device 20 is mounted on the eyepiece mount unit 10, and the lens barrel of the eyepiece device 20 is mounted.
The cam ring 26 is adjusted so that 24 is at the position when the image is taken by the camera. In this state, the outer ring 27,
The jig insertion hole 36 and the pin insertion hole 37 formed in the cam ring 26, the main body ring 25, and the operation ring 31 are aligned with each other. Further, the long groove 41 of the lens barrel 24 is in a state of being aligned with the jig insertion hole 36.

Then, the decorative ring 28 is detached, the jig insertion hole 36 and the pin insertion hole 37 are exposed to the outside, and a driver or the like is inserted into the pin insertion hole 37 to loosen the locking pin 32. by this,
The lens barrel 24 is in a state of being movable relative to the actuation ring 31. After that, the jig 40 is inserted into the jig insertion hole 36, and the tip portion 40a thereof is fitted into the long groove 41. When the jig 40 is rotated in this state, the lens barrel 24 moves in the optical axis direction, and the distance between the lens barrel 24 and the exit end face 11a of the image guide 11 is adjusted so as to be in focus. When the position adjustment of the lens barrel 24 is completed, the jig 40 is left as it is, or the jig 40 is detached from the jig insertion groove 36 and the locking pin 32 is tightened again to fix the lens barrel 24. To do. Further, by mounting the makeup ring 28, the position adjustment of the lens barrel 24 is completed.

In this way, by adjusting the position of the lens barrel 24 in the lens supporting portion 21, the position of the image guide exit end 11a of the eyepiece lens is adjusted. When inserting or removing an adapter such as a camera, load is not applied to the connecting portion between the lens barrel 24 and the lens support portion 21, the lens barrel 24 is stable, and misalignment does not occur during operation. It won't happen. Further, the jig insertion hole 36 and the pin insertion hole 37 are formed in the lens supporting portion 21, and the position of the lens barrel 24 can be adjusted by a simple configuration in which the long groove 41 is formed in the lens barrel 24. Thus, this position adjusting mechanism can be remarkably simplified.

[Advantage of Invention] As described above, according to the present invention, a jig insertion hole for inserting a jig for adjusting the position of the lens barrel and a locking pin for fixing the lens barrel are screwed into the lens supporting portion. Since the lens barrel is configured to adjust the position in the optical axis direction with respect to the lens supporting portion by providing a pin insertion hole to simplify the structure of the position adjusting mechanism for the image guide exit end of the eyepiece lens. In addition, when the adapter such as a camera is attached / detached to / from the eyepiece lens device, the lens barrel is not displaced, and it is possible to hold the lens barrel in an extremely stable state.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a sectional view of an eyepiece, FIG. 2 is an exploded perspective view of an essential part of a lens supporting portion thereof, and FIG. FIG. 4 is an overall configuration diagram of the endoscope. 1: insertion part, 2: main body operation part, 4: eyepiece part, 10: eyepiece mount part, 11: image guide, 11a: emission end, 13: connection ring,
20: eyepiece lens device, 21: lens support part, 22: connection part, 24:
Lens barrel, 25: body ring, 26: cam ring, 27: outer ring, 28: decorative ring, 30: connecting ring, 31: actuating ring, 32: locking pin, 33: drive pin, 36: jig insertion hole , 37: pin insertion hole, 40: jig, 40a: tip, 41: long groove.

Claims (1)

[Scope of utility model registration request] 1. A connecting portion detachably connected to an eyepiece mount portion provided in a main body operating portion of an endoscope, a lens barrel, and the lens barrel, which is fitted with a locking pin. A lens including an actuation ring fixedly provided to the lens barrel, a body ring provided by fitting the actuation ring movably in the axial direction, and a cam ring fitted to the body ring. A drive pin projectingly provided on the actuation ring is passed through the body ring to engage with the cam ring, and the cam ring is rotated to integrally form the actuation ring and the lens barrel. When the cam ring is arranged at a predetermined position during shooting by a camera, the main body ring and the cam ring have a pin insertion hole at a portion corresponding to the mounting portion of the locking pin. To The lens barrel is provided with a long groove in the circumferential direction, and the cam ring, the main body ring, and the operating ring are provided with jig insertion holes at positions corresponding to the long grooves, and the jig insertion holes are inserted into the jig insertion holes. A jig having a tip provided on the tip of a possible rod-shaped member at a position eccentric with respect to the axis of the rod is provided when engaging with the long groove, and the lens barrel is moved relative to the operating ring by the jig. With the axial position adjusted, the lens barrel is connected and fixed to the operating ring by screwing the locking pin into the operating ring through the pin insertion hole. A characteristic endoscope eyepiece device.