JPH0467162B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an eyepiece device for an endoscope, and in particular, the eyepiece lens can be moved in the optical axis direction by adjusting the diopter, and when an optical adapter is attached, the eyepiece can be moved in the optical axis direction. The present invention relates to an eyepiece device that allows an eyepiece lens to be moved to a predetermined reference position regardless of the power adjustment position.

"Prior Art" In an endoscope, both direct observation is performed by placing the eye directly on the eyepiece, and indirect observation is performed by attaching an optical adapter such as a photographing device to the eyepiece. In this case, for direct observation it is necessary to adjust the position of the eyepiece according to the diopter of the operator, while for example to take a photograph it is necessary to move the eyepiece to a reference position, for example the 0 diopter position. However, when an optical adapter such as a photographic device is attached to the eyepiece range, it is difficult for the operator to move the eyepiece lens to the reference position each time.
This is not only complicated, but also causes operational errors. Against this background, various eyepieces have been proposed that can automatically move the eyepiece to the reference position when an optical adapter is attached to the eyepiece, regardless of the eyepiece position due to diopter adjustment. ing.

``Object of the Invention'' An object of the present invention is to provide an eyepiece device for an endoscope that has a structure different from those of the conventional devices, but can achieve the same purpose. In addition, in view of the recent demand for waterproof eyepieces, the present invention proposes an eyepiece structure that is easy to make waterproof, and after making it waterproof, eccentric adjustment of the image transmission optical fiber bundle and optical axis direction position. To provide an eyepiece device in which adjustment can be easily performed only on the eyepiece device side.

"Summary of the Invention" The endoscope eyepiece device of the present invention has a fixed tube fixed to the operating section of the endoscope; an image-transmitting optical fiber bundle facing the eyepiece supported by the eyepiece; an eyepiece tube holding the eyepiece and slidably inserted into the fixed tube; rotatably supported outside the fixed tube; A cam tube that rotates together with the degree adjustment ring; A cam opening that is drilled on the circumference of this cam tube, with the rear surface as the cam surface and the front open; capable of relative sliding between the fixed tube and the eyepiece tube. an interlocking pin that is inserted into the intermediate tube and is movable by a certain distance with respect to the eyepiece tube; an interlocking pin that is implanted in the intermediate tube and engages with the cam surface of the cam tube; a compression coil spring; a second compression coil spring that presses the eyepiece barrel forward with respect to the intermediate barrel and positions it at the forward moving end with respect to the intermediate barrel; and a guide piece of the optical adapter attached to the rear end of the fixed barrel and an interlocking protrusion formed on the rear end of the eyepiece barrel that engages with the eyepiece.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. 9 and 10 are general views of an endoscope to which the present invention is applied, in which the eyepiece device 10 is connected to the rear of the operating section 11. FIG. In the front part of the operation part 11, there is an in-body insertion part 13 that houses an image transmission optical fiber bundle 12, etc.
are arranged in series, and the distal end surface of the image transmission optical fiber bundle 12 is
It faces an objective lens provided at the distal end of the intracorporeal insertion section 13. The rear end exit surface of the image transmission optical fiber bundle 12 is
It is led to the eyepiece device 10 through the intracorporeal insertion section 13 and the operation section 11, and its image is observed through the eyepiece. As is well known, inside the body insertion part 13,
In addition to the image transmission optical fiber bundle 12, the tip is inserted into the body insertion part 1.
3, an optical fiber bundle for illumination whose rear end is guided by the light guide cable 14, a forceps channel through which the forceps inserted through the forceps mouth 15 protrude from the distal end of the body insertion part 13, etc. are inserted, but illustration of these elements is omitted.

FIG. 1 is a sectional view of this eyepiece device 10. In this eyepiece device 10, which has a cylindrical structure as a whole, a fixing screw 2 is provided on a fixing base plate 20 on the operation section 11 side.
A base barrel 22 is fixed to the base barrel 22 via a fixing screw 23, and an optical adapter mounting ring 26 is fixed to the sliding guide barrel 24 via a fixing screw 25. ing. The base tube 22, the sliding guide tube 24, and the optical adapter mounting ring 26 are fixed tubes.

An eyepiece lens tube 28 holding an eyepiece lens 27 is slidably inserted into the sliding guide tube 24 while being kept liquid-tight by an O-ring R, and the front part of this eyepiece lens tube 28 is slidably inserted into the slide guide tube 24 . An intermediate cylinder 29 is fitted between the movable guide cylinder 24 and the intermediate cylinder 29 so as to be slidable a certain distance relative to both cylinders. The image transmission optical fiber bundle 1
2 is guided into the eyepiece lens tube 28 from the sliding guide tube 24, and the rear end exit surface 12a is connected to the eyepiece lens 2.
It is facing 7.

An interlocking pin 30 having an interlocking part 30a projecting outward in the radial direction and a regulating part 30b projecting inward is implanted in the intermediate cylinder 29.
is a linear guide groove 31 formed in the sliding guide tube 24.
, and further enters a cam opening 33 formed on the circumferential surface of the cam cylinder 32. On the other hand, regulation section 3
0b is fitted into a straight guide groove 34 formed in the eyepiece barrel 28, restrains rotation of the eyepiece barrel 28, and prevents the eyepiece barrel 28 and intermediate layer 29 from being exposed to light within the range of the straight guide groove 34. It allows relative sliding in the axial direction.

The intermediate tube 29 is slidably biased rearward by a first compression coil spring 35 inserted between its front end surface and the rear end surface of the base tube 22. It is slidably biased by a compression coil spring 36 to move forward with respect to the intermediate tube 29, and the eyepiece tube 28 and the intermediate tube 29 are normally brought into contact with each other at their respective contact surfaces 28a and 29a. The second compression coil spring 36 is inserted between the front end surface of the intermediate tube 29 and a spring seat 37 screwed onto the front end surface of the eyepiece tube 28. Therefore, the eyepiece lens barrel 28 and the intermediate barrel 29 always move together unless their movements are restrained, but when the intermediate barrel 29 is fixed, the eyepiece barrel 28 and the intermediate barrel 29 move against the force of the second compression coil spring 36. Only the lens barrel 28 can be pulled out.

As shown in FIG. 2, the cam opening 33 of the cam cylinder 32 has a cam surface 40 on its rear surface and is open at the front. comes into contact with.
Therefore, when the cam barrel 32 is rotated, the interlocking portion 30a moves according to the inclination of the cam surface 40, and the eyepiece barrel 28 moves in the optical axis direction via the intermediate barrel 29. The cam barrel 32 is fixed via a fixing screw 42 to a diopter adjustment ring 41 fitted on the outside of the cam barrel 32. Therefore, when the diopter adjustment ring 41 is rotated, the eyepiece barrel 28 is moved in the optical axis direction. The diopter is adjusted by moving. Note that this cam cylinder 32 is inserted between the diopter adjustment ring 41 and the diopter adjustment ring 41.
An O-ring R for maintaining liquid tightness is also inserted between the optical adapter mounting ring 26 and the optical adapter mounting ring 26.

The optical adapter mounting ring 26 has a cylindrical portion 26a and a bottom portion 2.
Optical adapter fixing pins 43 and 44 are provided protruding from the outer periphery of the cylindrical portion 26a, and the eyepiece tube 28 has interlocking protrusions 45 and 45 protruding in the radial direction at its rear end. 45 is integrally provided (see FIG. 5). As shown in FIG. 6, an optical adapter such as a photographing device to be attached to the optical adapter attachment ring 26 has optical adapter fixing pins 43 and 44 attached to its cylindrical front attachment portion 46.
L-shaped fixing notches 47 and 48 are formed corresponding to these, and guide pieces 49 and 49 corresponding to the interlocking protrusions 45 and 45 are provided inside these notches. As shown in FIGS. 6 and 7, the guide pieces 49, 49 have a retaining groove 50 for the interlocking protrusions 45, 45 in the center, and a tapered guide groove with an enlarged diameter on both sides of the retaining groove 50 in the circumferential direction. 51, 51, and when the fixing notches 47, 48 of the front attachment part 46 are fitted into the optical adapter fixing pins 43, 44 and rotated according to the shape, the eyepiece lens barrel 28 can be moved within the range of movement due to diopter adjustment. Then, the interlocking protrusions 45, 45 must be guided by the tapered guide grooves 51, 51, and the holding groove 50
Fits inside. The state in which the interlocking protrusion 45 is fitted into the holding groove 50 is a position in which the eyepiece lens barrel 28 has moved to a reference position in the optical axis direction, for example, to 0 diopters.

A plurality of electrical contacts 55 with the optical adapter are provided on the bottom portion 26b of the optical adapter mounting ring 26. This electrical contact 55 is connected to the eyepiece 10, for example.
This is to give various photographic signals such as the brightness of the subject image detected on the side to the photographing device, and the fixing screw 5
The raised part 5 of the insulating ring 57 fixed to the bottom part 26b at 6
8 (see Figures 1 and 8). The reason why the electrical contacts 55 are provided on the raised portion 58 is to prevent water from adhering between the electrical contacts 55 and causing an electrical short circuit when the eyepiece 10 is immersed in a disinfectant solution to sterilize it and then pulled up. It's for a reason. Furthermore, in order to quickly remove water droplets from the optical adapter mounting ring 26, the cylindrical portion 26a of the optical adapter mounting ring 26 has a
A plurality of drainage holes 59 are located near the bottom 26b.
is drilled.

Further, a transparent cover glass 27a that protects the eyepiece lens 27 is tightly attached to the rear end surface of the eyepiece lens barrel 28 via an O-ring R, and this cover glass 27a is screwed onto the inner periphery of the rear end of the eyepiece lens barrel 28. It is fixed by a presser ring 27b that is fitted together. The rear end surface of this transparent cover glass 27a is attached to a presser ring 27b.
It is flush with or protrudes from the rear end surface, and water droplets tend to fall from the cover crow 27a when it is pulled up after being immersed in a disinfectant solution.

Next, the eccentricity adjustment mechanism and optical axis direction position adjustment mechanism of the image transmission optical fiber bundle 12 will be explained. Conventionally, this type of mechanism has often been provided on the operating section 11 side, but if a watertight structure is used, these adjustment mechanisms make it difficult to make the operating section 11 watertight. The device shown in this embodiment allows these adjustments to be made on the eyepiece device 10 side while maintaining a watertight structure.

An opening/closing cylinder 60 is fitted between the base cylinder 22 and the cam cylinder 32 via inner and outer O-rings R. This opening/closing cylinder 60 is fixed to the base cylinder 22 with a fixing screw 61, but when the fixing screw 61 is loosened,
It can be slid inside the cam cylinder 32, so that the base cylinder 22 and the sliding guide cylinder 24 are exposed. As shown in FIGS. 1 and 3, the sliding guide tube 24 and the base tube 22 have radial through holes 62,
63 is bored, and the base cylinder 22 has a first
As shown in FIG. 4, a radial eccentric adjustment screw 64 is screwed together, and a peep hole 65 for the eccentric adjustment screw 64 is bored in the sliding guide tube 24. As shown in FIG.
The eccentric adjustment screw 64 and the peephole 65 are provided at 120° intervals, as shown in FIG.

The image transmission optical fiber bundle 12 is integrated into the inner holding cylinder 66 and is further fixed to the outer holding cylinder 68 with fixing screws 67 . The holding outer cylinder 68 is the eccentric adjustment cylinder 6
9, and is slidably fitted in the eccentric adjustment tube 6.
9 has its adjusting flange 69 a in contact with the holding flange 22 a of the base cylinder 22 . The compression coil spring 70 acts to keep these flanges in constant contact. A clearance c is provided between the outer periphery of the adjustment flange 69a and the inner periphery of the base cylinder 22 so that the entire eccentric adjustment cylinder 69 can be moved by a small amount in the radial direction. The outer periphery of the adjusting flange 69a has an annular V groove 7 into which the eccentric adjusting screw 64 is fitted.
1 is formed. In addition, the eccentric adjustment cylinder 69 has
A fixing screw 72 for fixing the eccentric adjustment cylinder 69 and the holding outer cylinder 68 is screwed together, and an insertion hole 74 for an adjustment rod 73 is bored on the opposite side of the fixing screw 72 in the radial direction. The holding outer cylinder 68 has a screw hole 75 into which the threaded end of the adjustment rod 73 is screwed.
is formed. A protective glass 77 prevents foreign matter from adhering to the rear end exit surface 12a of the optical fiber bundle 12.

According to this adjustment mechanism, the fixing screw 61 is loosened to move the opening/closing cylinder 60 into the cam cylinder 32, and in this state, the adjusting rod 73 is inserted through the radial through hole 62 and the insertion hole 74 and screwed into the screw hole 75. Then, the holding outer cylinder 68 can be moved from the outside in the optical axis direction via the adjustment rod 73. At this time, a screwdriver is inserted through the radial through hole 63 on the opposite side of the radial through hole 62 to loosen the fixing screw 72. After adjusting the optical axis direction position,
By tightening the fixing screw 72, the adjustment in the optical axis direction is completed. Eccentricity adjustment can be performed by adjusting the threading depth of the three eccentricity adjustment screws 64. When the above adjustment is completed, open/close cylinder 6
0 from the inside of the cam cylinder 32, put it on the base cylinder 22, and fix it with the fixing screw 61. Then, liquid tightness is maintained by the O-rings R inside and outside the opening/closing cylinder 60.

The present eyepiece device 10 having the above configuration is used after the above adjustment and assembly is completed. When the diopter adjustment ring 41 is now rotated, the cam tube 32 rotates together, and the interlocking portion 30a, that is, the intermediate tube 29 and the eyepiece tube 28 move together in accordance with the inclination of the cam surface 40. Therefore, the diopter can be adjusted freely.

On the other hand, in order to attach the optical adapter to the optical adapter mounting ring 26, the optical adapter mounting ring 2
The fixing notches 47 and 48 of the front adhesive part 46 of the optical adapter are fitted into the optical adapter fixing pins 43 and 44 of No. 6, and the front adhesive part 46 is rotated according to the shape of the L-shaped fixing notches 47 and 48. Then, no matter where the eyepiece lens tube 28 is located in the optical axis direction by adjusting the diopter, the tapered guide grooves 51 of the guide pieces 49, 49,
51 , the interlocking projections 45 , 45 of the eyepiece barrel 28 fit into the holding groove 50 . Holding groove 50
Since the position of is fixed with respect to the optical adapter mounting ring 26, the interlocking protrusion 45 is located in the holding groove 50.
The position of the eyepiece lens tube 28 in the optical axis direction when it is fitted is constant, so when the optical adapter is attached, the eyepiece lens tube 28 can be moved to a reference position (for example, 0 diopter position).

The movement of each member when this optical adapter is attached differs depending on whether the eyepiece barrel 28 is located in front of or behind the reference position. Before the reference position (-
2), the rearward movement of the intermediate cylinder 29 is caused by the movement of the cam cylinder 32 against which the interlocking part 30a comes into contact.
Since the intermediate cylinder 29 is regulated by the cam surface 40 of
does not move, and only the eyepiece barrel 28 moves backward (to the reference position) due to the relationship between the straight guide groove 34 and the regulating portion 30b. On the other hand, the eyepiece tube 2
8 is behind the reference position (+ diopters), the front side of the cam opening 33 of the cam tube 32 is open, so the forward movement of the intermediate tube 29 is not restricted, and therefore the eyepiece tube 28 and the intermediate Tube 29
moves forward in its entirety.

When the optical adapter is removed from the attachment ring 26, the eyepiece barrel 28 returns to the position before the optical adapter was attached. That is, unless the diopter adjustment ring 41 is rotated with the optical adapter attached, the relative position of the interlocking part 30a of the cam surface 40 will not change, so the eyepiece barrel 28 is connected to the first compression coil spring 35 and the second compression coil. The force of the spring 36 restores the state before the optical adapter was attached.

A sign M indicating that this endoscope is a liquid-tight endoscope is fitted onto a part of the outer circumference of the opening/closing tube 60. This top plate M has a color different from the color of the opening/closing tube 60,
For example, it can be colored aqua (blue) to indicate that it is a liquid-tight endoscope.

"Effects of the Invention" As described above, according to the endoscope eyepiece device of the present invention, the diopter can be adjusted freely by rotating the diopter adjustment ring during direct observation, and the optical adapter can be used to adjust the diopter freely. At the time of indirect observation, the eyepiece can be moved to a predetermined reference position by the attachment operation of the optical adapter. The present invention particularly provides an eyepiece tube, an intermediate tube, a cam tube,
Due to the relationship between the first and second compression coil springs, when the eyepiece position when attaching the optical adapter is behind the reference position, the entire eyepiece barrel and intermediate barrel move to the reference position. When it is further forward, a special operation can be obtained in which only the eyepiece barrel moves to the reference position.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the eyepiece device of the present invention, FIG. 2 is a developed view as viewed from the arrows with the diopter adjustment ring of FIG. 1 removed, and FIGS. The figure is a sectional view taken along the - line and - line in Fig. 1,
Figure 5 is a left side view of Figure 1, Figure 6 is a perspective view of the front attachment part of the optical adapter, Figure 7 is a perspective view of the guide piece provided in this attachment part, and Figure 8 is a perspective view of the insulating ring. FIG. 9 is a front view showing the entire endoscope equipped with an eyepiece, and FIG. 10 is a plan view thereof. 10... Eyepiece device, 11... Operation unit, 12...
Image transmission optical fiber bundle, 13... In-body insertion part, 22...
...Base tube (fixed tube), 24...Sliding guide tube (fixed tube), 26...Optical adapter mounting ring (fixed tube), 2
7...Eyepiece lens, 28...Eyepiece tube, 29
... Intermediate cylinder, 30 ... Interlocking pin, 32 ... Cam cylinder, 33 ... Cam opening, 34 ... Straight guide groove, 3
5...First compression coil spring, 36...Second compression coil spring, 40...Cam surface, 41...Diopter adjustment ring, 43, 44...Optical adapter fixing pin, 4
5... Interlocking protrusion, 46... Front attachment part, 47, 4
8... Fixed notch, 49... Guide piece.

Claims (1)

[Claims] 1 A fixed tube fixed to the operating section of the endoscope; an image-transmitting optical fiber bundle whose distal end face faces the objective lens at the tip of the body insertion part and whose rear end exit surface faces the eyepiece supported by the fixed tube; the eyepiece mentioned above; an eyepiece barrel that holds a lens and is slidably inserted into the fixed barrel; a cam barrel that is rotatably supported outside the fixed barrel and rotates together with the diopter adjustment ring; A cam opening drilled in the circumferential surface, with a cam surface on the rear surface and an open front; inserted so as to be relatively slidable between the fixed tube and the eyepiece tube, and movable a certain distance with respect to the eyepiece tube. an intermediate cylinder; an interlocking pin implanted in the intermediate cylinder and engaged with the cam surface of the cam cylinder;
A first compression coil spring that presses the intermediate tube backward; a second compression coil spring that presses the eyepiece tube forward with respect to the intermediate tube and positions it at the forward moving end with respect to the intermediate tube; and a rearward of the fixed tube. An eyepiece device for an endoscope, comprising an interlocking protrusion formed at the rear end of the eyepiece barrel that engages with a guide piece of an optical adapter attached to the end.