JPH0745057Y2 - Optical axis adjustment device for reflective member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an optical axis adjusting device for a reflecting member which is improved so that the optical axes of intersecting optical systems can be easily adjusted.

[Problems to be Solved by Conventional Techniques and Inventions] In recent years, endoscopes are widely used in which a slender insertion portion is inserted into the body to observe the inside of the body and a treatment tool is used to perform treatment treatment of a necessary portion. The endoscope includes a flexible endoscope having a flexible insertion portion and a rigid endoscope having a rigid insertion portion that is linearly inserted toward a target site.

Since this rigid endoscope is inserted linearly, it has excellent sniperability, and since a relay lens system can be used for the image transmission means, it has a higher resolving power than a flexible endoscope using an image guide fiber. It is possible to obtain a high optical image.

By the way, for the purpose of improving operability and the like, this rigid endoscope includes a bending type in which an eyepiece tube is connected to an insertion tube inserted into a body cavity through a light bending portion. In this bending type rigid endoscope, a reflection member is inserted in the bending portion, and the optical axis of the insertion tube and the eyepiece portion are matched by this reflection member, and an observation image formed at the tip of the insertion tube. Is transmitted to the eyepiece tube through the reflecting member. Therefore,
In this bending type rigid endoscope, it is an important problem to precisely set the position, angle, etc. of the reflecting member and adjust and match the plurality of optical axes.

8 and 9 relate to the prior art of an optical axis adjusting device provided for this purpose, FIG. 8 is a sectional side view of a bent portion, and FIG. 9 is an enlarged perspective view of a reflecting member adjusting device. .

In these drawings, reference numeral 1 is a connecting tube, 2 is this connecting tube 1
The eyepiece tube is detachably fixed to the
The angle between the eyepiece tube 2 and the eyepiece tube 2 is set to a right angle. An inner cylinder 3 is inserted through and fixed to the connecting cylinder 1, and an optical system 3a is incorporated in the inner cylinder 3. On the other hand, an inner tube 4 is inserted and fixed in the eyepiece tube 2, and an optical system 4a is also installed in the inner tube 4. As shown in FIG. 9, a pair of holding plates 6, 6 are fixed to the tip of the inner cylinder 4, and a prism 7, which is an example of a reflecting member, is held between the holding plates 6, 6, and the prism 7 Is fixed by a screw member 8 screwed to the fixing plates 6, 6. Then, the holding plate 6 and the screw member 8
And form the adjusting device 9 for the prism 7.

The prism 7 faces the optical system 3a of the connecting tube 1, while the optical system 4a of the eyepiece section 2 faces the prism 7, and the prism 7 has an optical system 3a. The transmitted observation image is transmitted to the optical system 4a of the eyepiece 2 through the prism 7.

The optical axis is adjusted by the optical axis adjusting device having such a configuration,
In the case of matching, the eyepiece 2 is fixed to the connection tube 1 in which the optical system 3a is installed, and the prism 7 is appropriately attached to the holding plate 6, 6 of the inner tube 4 in which the optical system 4a is installed by the screw member 8. It is fixed at the angle and position and is inserted into the eyepiece section 2.

Then, by visually observing the image transmitted from the connecting tube 1 through the prism 7 from the eyepiece section 2, if a defect is found in the observed image, the inner tube 4 is removed from the eyepiece section 2 and screwed. The member 8 is loosened, the prism 7 is set at an angle and a position which are considered to be appropriate, and then fixed, and then the prism 7 is inserted into the eyepiece section 2 again and visually observed in an observation image.

As described above, in the above-mentioned conventional technique, it is necessary to adjust the position of the reflecting member and adjust the angle thereon, and the work for the adjustment also requires removing the inner cylinder from the eyepiece 2, which is extremely complicated. It was something. In order to simplify the complicated work,
For example, Japanese Utility Model Laid-Open No. 63-88814 has been proposed.

This is because the reflecting member is held between a plurality of elastic bodies, and moreover, the engaging portion provided on the reflecting member and the engaged portion provided on the elastic body are gently engaged. The elastic body is fixed to a cylindrical body containing one of the two intersecting optical systems.

With this configuration, the complexity of the work is somewhat reduced, but it is still necessary to adjust the angle as well as the position of the reflecting member. Moreover, the structure is complicated, such as the provision of an elastic body or the engagement portion for engaging the elastic body and the reflecting member, and the assembling work is troublesome.

Further, as a drawback of the above-mentioned two conventional techniques, since a prism is used for the reflecting member, the prism is a pentahedron in which each surface is rectangular, and the ridge length of each surface is equal to or equal to the outer diameter of the optical system. However, the diagonal length of each surface of the prism is larger than the outer diameter of the optical system because the length longer than that is required.

Further, since a member for holding the prism is required, when the prism which is the reflecting member is rotated with respect to the optical axis, the corner of the diagonal end or the prism holding member is, for example, the eighth member.
It may hit the end of the optical system 3a shown in the figure.

Therefore, there is a problem that the prism or the end surface of the optical system is damaged when the cylinder 4 is inserted into the eyepiece tube 2 or when the optical axis is adjusted.

In addition, the diagonal of each surface of the prism is larger than the outer diameter of the optical system, and since a member for holding the prism is required, the portion for accommodating the optical system becomes large. Therefore, inconvenient problems arise for a rigid endoscope, which is required to be lighter and have a smaller outer diameter of the insertion portion, such as an increase in weight and an outer diameter of the insertion portion in the body cavity.

Moreover, when the prism is rotated and moved back and forth with respect to the optical axis, the prism is fixed not only to the prism but also to the holding member because the prism is fixed to the holding member of the prism and the inner cylinder containing the optical system. Also, it is necessary to rotate and move back and forth integrally with the inner cylinder, and there is a problem that dust, dust, and the like easily enter the optical system.

The present invention has been made in view of these circumstances, and the optical axis of an optical system that intersects can be easily adjusted without using a prism having the above-mentioned inconvenience as a reflecting member. An object is to provide an optical axis adjusting device for a member.

[Means for Solving the Problem and Its Action] In order to achieve the above-mentioned object, the optical axis adjusting device for a reflecting member according to the present invention is such that, in two optical systems intersecting with each other, the reflecting member is placed on the optical axis of one optical system. On the other hand, it has a fixing means that is slidable in the direction of the optical axis and is rotatable around the optical axis and that can be fixed at any position of the sliding and the rotation. .

With this configuration, the optical axis of the two intersecting optical systems is adjusted by sliding and rotating the reflective member with respect to the optical axis while visually confirming the observation image transmitted through the reflective member.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 relate to a first embodiment of the present invention.
FIG. 1 is a sectional view showing an optical path changing portion which is a main part, and FIG.
FIG. 3 is an explanatory sectional view showing a state where the reflecting member in the figure is moved to adjust the optical axis, and FIG. 3 is a perspective view showing a rigid endoscope including the optical axis adjusting device of the present invention.

In FIG. 3, reference numeral 11 is a rigid endoscope, and an elongated insertion portion 12 is formed in this rigid endoscope 11, and the objective portion 12a, the illumination portion 12b, and the opening are formed at the tip of this insertion portion 12. And a part 12c. A main body 13 is fixed to the base end of the insertion portion 12, and a connection tube 14 is connected to the main body 13. A bent portion 15 is integrally formed at the tip of the connecting tube 14, and an eyepiece tube 16 is fixed to the bent portion 15 at a substantially right angle.
An eyepiece 16a is formed at the tip of 16. In addition, a light guide connector 13a, to which the base end of a fiber bundle extending to the illuminating portion 12b is connected, is attached to the main body 13, and a channel hole 13c extending to the opening 12c. Is provided and communicates with a forceps hole 26a opened at the rear end of the main body 13.

As shown in FIG. 2, a fixed pipe 17 is installed in the connecting cylinder 14, and a space pipe is provided in the fixed pipe 17 near the main body 13.
An optical system 20 sandwiched between 18 and a fixing ring 19 is arranged. On the other hand, the main body 13 is internally provided with an inner tube 21, and in the inner tube 21, an optical system 24 fixed in a fixed tube 22 by a spacing tube 23 is arranged. A female screw portion 13b is formed on the upper side of the main body 13, and the eyepiece tube 14 is screwed into the female screw portion 13b. In addition, the inner pipe 21 and the fixed pipe 22
Is a hole 21a formed in a portion corresponding to the female screw portion 13b.
And a hole 22a, and the hole 21a and the hole 22a are formed to be large enough so as not to block a light beam passing therethrough.

A cylindrical reflecting member 25 having an outer diameter substantially equal to the inner diameter of the fixed tube 22 and having a reflecting surface 25a is slidably and rotatably inserted into the fixed tube 22. A forceps hole cover 26 having a forceps hole 26a is provided on the opposite side of the insertion portion 12 of the main body 13 from the O-ring 26b.
An adjusting lid 24 attached in a watertight state is fitted by a screw and a screw 26c, and is fixed to the main body 13 by a screw. A channel hole 13c is formed in the lower portion of the inner tube 21 in parallel with the inner tube 11 by a forceps tube 29 fitted and connected to a forceps hole 26a of a forceps hole cover 26. Further, in order to keep the watertightness between the main body 13 and the adjusting lid 27, the adjusting lid 27 is
The ring groove 27a is provided and the O-ring 30 is fitted therein.

With such a configuration, the reflecting member 25 is adjusted as follows.

First, the screw 28 is loosened, and the adjustment lid 27 is pulled out together with the forceps hole lid 26 from the main body 13. Then, as shown in FIG. 3, for example, the thumb 31 and the index finger 32 are put in the inner diameter portion of the main body, and the reflection member
Having an end face near the reflecting surface 25a of 25, looking into the eyepiece 16a, through the optical system 24 from the objective unit 12a, observe the image reflected by the reflecting surface 25a and passing through the optical system 20. However, the reflecting member 25 is moved in the front-rear direction so that the optical axes of the optical systems 20 and 24 are aligned with the fixed tube 22, or the fixed tube is fixed.
It is rotated about the central axis of 22. Then, when the optical axes coincide with each other, in order to fix the reflection member 25 to the fixed tube 22, an adhesive 33 is provided near the portion where the proximal end surface of the fixed tube 22 and the peripheral surface of the reflection member 25 are in contact with each other. It is applied and fixed to the fixed tube 22 by adhesion so that the reflecting member 25 does not move.

According to this configuration, the optical axis adjusting device using the conventional prism requires a space for moving the prism in order to adjust the position and angle of the prism, so that the space between the fixed tube 22 or the inner tube 21 and the forceps tube 29 is required. However, the inner tube 21 and the forceps tube 29 can be brought into close contact with each other, so that the outer diameter of the insertion portion 12 can be made smaller.

Further, since the optical axis can be adjusted by moving only the reflecting member 25 without moving the fixed tube 22 or the like, it is not necessary to move the optical system 24 as a whole, and dust in the optical system 24 due to it is eliminated.
The occurrence of dust etc. can be prevented.

Further, since the optical system 24 and the reflecting member 25 are held by the same fixed tube 22, it is easy to obtain the coaxiality of both, and the moving direction of the reflecting member 25 is only the front-back direction with respect to the optical axis and the rotating direction. Good and easy to adjust.

Furthermore, since the fixed tube 22 accommodating the optical system 24 can be used as it is as a holding means for the reflecting member 25, the structure becomes simpler than in the past.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of the bending portion 15 in FIG. 3, for example, in which the connecting tube 14 is fitted in the one bending body 34 and the eyepiece tube 16 is fitted in the other bending body 35. Have been combined. The bending body 34 is provided with a fitting hole 34a, and the other bending body 35 is fitted therein at a substantially right angle. The eyepiece tube 16 and the bending body 35 or the eyepiece tube 14 and the bending body 34 may be integrally formed. The bending body 35 is provided with a hole 35a having an inner diameter sufficient not to interfere with the image sent from the optical system 20.

Further, the bending body 35 has the same central axis as the fixed tube 22,
Holding hole 35b having substantially the same inner diameter as the outer circumference of the reflecting member 25
And an O-ring groove 35c is provided, and the reflection member 25 is slidably and rotatably inserted in the vicinity of the left end of the holding hole 35b and the fixed tube 22 so as to slightly project from the inlet of the holding hole 35b.
An O-ring 36 is fitted in the ring groove 35c so as to be in close contact with the peripheral surface of the reflecting member 25.

The bending body 34 is provided with an assembling hole 34b, and an assembling lid 37 is screwed into the assembling hole 34b. Further, a female screw 35d for a screw is provided on one side of the bending body 35, and the fixing screw 3d is provided there.
8 is screwed.

In such a configuration, the fixing screw 38 is loosened, the reflection member 25 slightly protruding from the holding hole 35b is pinched by a finger or the like (not shown), and the eyepiece 16a is viewed through the optical system 20 and reflected from the reflection member 25. While observing the image that is transmitted through the optical system 24, the reflecting member 25 is rotated in the front-rear direction or rotated so that the optical axes of the optical systems 20 and 24 are aligned with the fixed tube 22 and the holding hole 35b. Move it in the moving direction, and fix it with the screw 38
And fix it to the holding hole 35b of the bending body 35.

Since the O-ring 36 is in close contact with the O-ring groove 35c and the peripheral surface of the reflecting member 25, water tightness is maintained without water entering the optical systems 20 and 24, the reflecting surface 25a and the like.

Further, according to this configuration, the reflection member can be adjusted from the outside of the rigid endoscope. Since fixing screws are used as fixing means instead of adhesives, repeated adjustment and fixing can be performed.

FIG. 5 is a sectional view showing a third embodiment of the present invention. This embodiment is almost the same as the second embodiment, but the fixed tube 22 is short, and the reflecting member 25 is held only by the holding hole 35b provided in the bending body 35. Also, as a fixing means, a fixing screw 38
However, the reflecting member 25 may be fixed to the bending main body 35 with an adhesive or the like as in the first embodiment.

While the operation of this embodiment is similar to that of the second embodiment,
In the second embodiment, since the reflecting member was inserted into the fixed tube that accommodates one of the optical systems, it was necessary to make the outer diameter of the optical system and the outer diameter of the reflecting member substantially the same. The outer diameter can be changed (for example, the outer diameter can be made larger than that of the optical system).

6 and 7 relate to a fourth embodiment of the present invention, and FIG. 6 is an enlarged sectional view from the bent portion 15 to the eyepiece tube 16 and the eyepiece portion 16a, as in the second and third embodiments. FIG. 7 is an explanatory view showing the adjustment state. As shown in FIG. 6, the connecting cylinder 14 is fitted in the one-side bending main body 34, and the eyepiece tube 16 is connected to the other-side bending main body.
It is fitted to 35.

The fitting hole 34a provided in the bending position 34 has an assembly lid 39 having an outer diameter substantially the same as the inner diameter of the fitting hole 34a and a hole 39a having an inner diameter substantially the same as the outer diameter of the fixed tube 22. Are fitted.

The fixed tube 22 is extended to the proximal side of the eyepiece section, and the eyepiece connecting tube 40 is fitted and fixed to the outer peripheral portion of the end surface of the fixed tube 22 on the proximal side of the eyepiece section. An internal thread 40a is provided on the inner diameter portion of the eyepiece connecting tube 40 on the eyepiece side, and the optical system 24 is fixed to the fixed tube 22 by pressing the interval tube 23 in the direction of the bent portion 15.
A fixing screw 41 for fixing the inside is screwed.
Further, an eyepiece optical system holding tube (not shown) is usually screwed into the female screw 40a of the eyepiece connecting pipe 40.

An eyepiece housing portion 42 having a joint hole 42a having substantially the same outer diameter as the outer diameter of the eyepiece tube 16 is joined and fixed to the outer circumference of the eyepiece portion 16 side end surface, and the above-mentioned eyepiece connecting tube 40 is provided in the inner diameter portion thereof. Is stored. On the outer peripheral portion of the eyepiece housing portion 42 near the eyepiece portion, O
The ring groove 24b and the male screw 42c are provided, and the eyepiece body 43 is screwed together. By inserting the O-ring 44 in the O-ring groove 42b, the watertightness between the eyepiece housing portion 42 and the eyepiece body 43 is ensured. I keep it.

An O-ring groove is formed on the outer peripheral portion of the eyepiece main body 43 near the eyepiece.
43a and a female screw 43b are provided, and the eyepiece 16
By inserting the O-ring 45 into the O-ring groove 43a by screwing a, the watertightness between the eyepiece main body 43 and the eyepiece 16a is maintained.

Further, the outer periphery of the eyepiece connecting portion 40 has an inner diameter substantially the same as the outer diameter of the eyepiece connecting portion 40, and is fixed slidably on the outer periphery of the eyepiece connecting portion 40. There are washers 46 and washers 47,
These are screwed into female threads 42d provided on the eyepiece side inner diameter of the eyepiece housing section 42, and by a fixed tube fixing screw 48 having an inner diameter slightly larger than the outer diameter of the eyepiece section connecting section 40, the direction of the bent portion. Is pressed against.

A portion of the inner diameter portion of the eyepiece storage portion 42, which is in contact with the fixed washer 46, has a taper 42e, and the fixed washer 46 is also provided with a taper 46a correspondingly.

When the fixing pipe fixing screw 48 is screwed and the fixing washer 46 and the washer 47 are pressed in the direction of the bending portion, the taper 42a provided on the eyepiece storage unit 42 causes the taper 46a provided on the fixing washer 46 to be fixed. As a result of being pushed in the inner diameter direction, the inner diameter of the fixed washer 46 becomes narrower, and the outer peripheral portion of the eyepiece connecting pipe is stopped. At this time, the eyepiece storage unit 42
Again, the fixed washer 46 will be bitten.

The washer 47 is provided so that the fixed washer 46 does not move due to the screwing of the fixed tube fixing screw 48 and only slides on the outer circumference of the eyepiece connecting tube 40.

Next, the operation will be described. FIG. 7 shows a state in which the eyepiece main body 43, to which the eyepiece 16a is screwed, is screwed from the eyepiece housing portion 42. When the fixed tube fixing screw 48 is screwed in this state and loosened to the eyepiece side, the contact pressure between the taper 42e provided in the eyepiece housing portion 42 and the taper 46a provided in the fixed washer 46 is loosened, As a result, the inner diameter of the fixed washer 46 returns (becomes larger) to the normal inner diameter, and the eyepiece connecting pipe 40 is brought into a slidable and rotatable state.

In this state, for example, the outer peripheral surface of the eyepiece connecting tube 40 on the eyepiece side is pinched with the thumb 31, the index finger 32, etc., and the reflecting surface is passed through the optical system 20.
While observing the image reflected by 25a and further passing through the optical system 24 from the vicinity of the eyepiece side inner diameter of the eyepiece connecting tube 40, the eyepiece connecting tube 40 with respect to the optical axis of the optical system 24. Optical system 20
The optical system is fixedly connected to the eyepiece connecting tube 40 by sliding or rotating so that both optical axes of the optical system and the optical system 24 coincide with each other.
A reflecting member 24, which has 24 built-in and is fixedly built in near the bent portion, slides or rotates with respect to the optics of the optical system 24.
Then, when the optical axes coincide with each other, the fixing tube fixing screw 48 is screwed to press the washer 47 and the fixing washer 46 toward the bending portion, and the taper 46a of the fixing washer 46 is attached to the eyepiece storage portion 42.
The inner diameter of the fixed washer 46 is reduced by strongly pressing it against the taper 42e, and the eyepiece connecting tube, the fixed washer 46, and the eyepiece housing portion 42 are bitten against the optical axis of the optical system 24. 25 is fixed.

In this configuration, adjustment can be performed near the eyepiece instead of opening the lid or the like near the bend and adjusting the reflecting member, so that the structure near the bend can be simplified (for example, by assembling the lids 37 and 39 for assembly). It can be integrated with the bending bodies 34, 35, etc.) Therefore, the bent portion can be reduced in size and weight.

Furthermore, in the case of the conventional method of adjusting near the bend, the eyepiece
When 16 becomes long, the eyepiece that is the place to be observed and the bent part that is the place to be adjusted will be separated, and it may be difficult to adjust, but if configured as in this example, It is easy to adjust because it can be adjusted near the eyepiece.

Furthermore, as a means for fixing the eyepiece connection pipe 40 to the eyepiece storage portion 42, a washer 47 and a fixed washer 46 are used, and the fixed washer 46 is used for the outer peripheral portion of the eyepiece connection pipe 40 and the eyepiece storage portion.
Since the eyepiece housing portion 42 and the eyepiece portion connecting tube 40 are fixed by being bitten on the inner diameter of the eyepiece 42, it is easy to obtain the coaxiality.

That is, it is easy to obtain the coaxiality of the optical axis of the optical system 24 with respect to the central axis of the eyepiece tube 16.

[Advantages of the Invention] As described above, according to the present invention, the optical axis adjusting mechanism can be simplified and the optical axes of intersecting optical systems can be easily adjusted.

[Brief description of drawings]

1 to 3 relate to a first embodiment of the present invention.
FIG. 1 is a sectional view showing an optical path changing portion which is a main part, and FIG.
FIG. 3 is an explanatory cross-sectional view showing how the optical axis is adjusted by moving the reflecting member in the figure, FIG. 3 is a perspective view showing a rigid endoscope equipped with the optical axis adjusting device of the present invention, and FIG. 4 is of the present invention. FIG. 5 is a sectional view showing a second embodiment, FIG. 5 is a sectional view showing a third embodiment of the present invention, FIGS. 6 and 7 are related to a fourth embodiment, and FIG. FIG. 7 is an explanatory end view, and FIGS. 8 and 9 are a sectional view and a perspective view showing a conventional example. 13 …… Main body, 14 …… Connection tube 15 …… Bend, 20,24 …… Optical system 25 …… Reflecting member, 25a …… Reflecting surface 33 …… Adhesive, 38 …… Fixing screw 46 …… Fixing washer , 46a …… Taper 47 …… Washer

Claims (1)

[Scope of utility model registration request] 1. An optical system which is interposed between one optical system and another optical system which intersects the optical system to reflect the optical axis from one optical system to the other optical system. In an optical axis adjusting device for reflectively connecting one optical system optical axis and the other optical system optical axis by a reflecting member having a reflecting surface formed in a slanting surface with respect to the optical axis of the optical system, Alternatively, a holding member that holds the reflecting member is extended on an extension line of one optical system optical axis to form a circular outer diameter, and the holding member of the reflecting member is not taken out from one optical axis. In order to directly move the reflecting member or the holding member, the reflecting member or the holding member is slidable in the optical axis direction with respect to one optical system optical axis, and is rotatable around the optical axis. Reflection characterized by having fixing means capable of fixing at any position Optical axis adjustment device for components.