JP2004049793A - Tip part of endoscope - Google Patents

Tip part of endoscope Download PDF

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Publication number
JP2004049793A
JP2004049793A JP2002214884A JP2002214884A JP2004049793A JP 2004049793 A JP2004049793 A JP 2004049793A JP 2002214884 A JP2002214884 A JP 2002214884A JP 2002214884 A JP2002214884 A JP 2002214884A JP 2004049793 A JP2004049793 A JP 2004049793A
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Japan
Prior art keywords
window
observation window
illumination
transparent cover
distal end
Prior art date
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Pending
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JP2002214884A
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Japanese (ja)
Inventor
Teruo Ouchi
大内　輝雄
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Pentax Corp
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Pentax Corp
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Priority to JP2002214884A priority Critical patent/JP2004049793A/en
Publication of JP2004049793A publication Critical patent/JP2004049793A/en
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  • Instruments For Viewing The Inside Of Hollow Bodies (AREA)
  • Endoscopes (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tip part of an endoscope capable of obtaining an excellent observation image without a flare or a ghost at the tip part of the endoscope at which the surface of an illumination window and the surface of an observation window are covered with a same transparent cover. <P>SOLUTION: At the tip part of the endoscope at which the illumination window 4 for ejecting an illuminating light and the surface of the observation window 3 for taking in a light image are arranged side by side at the tip end 2 of an inserting part, and the surface of the illumination window 4 and the surface of the observation window 3 are covered with the same transparent cover 11, a groove 12 the bottom face of which becomes gradually deep from the illumination window 4 side to the observation window 3 side is formed so as to partition between the illumination window 4 and the observation window 3 on the outer surface at a part positioned between the illumination window 4 and the observation window 3 of the transparent cover 11. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は内視鏡の先端部に関し、特に、挿入部の先端に設けられた照明窓と観察窓とが同じ透明カバーによって被覆された内視鏡の先端部に関する。
【０００２】
【従来の技術】
近年、内視鏡を介しての患者から患者への感染を未然に確実に防止する必要性が高まっている。
【０００３】
その方策として、内視鏡の挿入部に対して被脱自在な水密性のシースを設けて、内視鏡にシースを被覆した状態で使用し、使用後にそのシースを新しいものと交換するのが一つの有力な手段である。そのようにする場合、照明窓と観察窓の表面にあたるシース部分は透明に形成しなければならない。
【０００４】
しかし、両窓の表面を連続的な一枚の透明カバーで被覆すると、例えば図８に示されるように、照明窓１０１から射出された照明光が透明カバー１０２の厚みの中で反射を繰り返して観察窓１０３内に入射し、観察視野にフレアーやゴーストが発生してしまう。
【０００５】
そこで従来は、透明カバーを例えば照明窓側から観察窓側へ次第に肉薄に形成し、照明窓から射出された光が透明カバーの厚みの中で観察窓側に向かう方向に反射を繰り返すと次第に反射角度が小さくなって観察窓まで達しないようにしていた（特許第２８６８２２８号）。
【０００６】
【発明が解決しようとする課題】
しかし、透明カバーを照明窓側から観察窓側へ次第に肉薄に形成する等の対策を施しても、照明窓から射出された照明光のうち観察窓以外の方向に向かった光が透明カバーの周辺部等で反射されて観察窓に到達すると、それが観察窓内に入射して観察視野にフレアーやゴーストが発生してしまう。
【０００７】
そこで本発明は、照明窓の表面と観察窓の表面とが同じ透明カバーで被覆された内視鏡の先端部において、フレアーやゴーストのない良好な観察像を得ることができる内視鏡の先端部を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記の目的を達成するため、本発明の内視鏡の先端部は、照明光を射出する照明窓と光像をとり入れる観察窓とが挿入部の先端に並んで配置され、照明窓の表面と観察窓の表面とが同じ透明カバーで被覆された内視鏡の先端部において、透明カバーの照明窓と観察窓との間に位置する部分の外表面に、底面が照明窓側から観察窓側へ次第に深くなる溝を、照明窓と観察窓との間を仕切る態様で形成したものである。
【０００９】
なお、溝の底面が照明窓側から観察窓側へ次第に深くなる斜面であってもよく、或いは、溝の底面が凹面状であってもその照明窓寄りの部分が照明窓側から観察窓側へ次第に深くなっていればよい。
【００１０】
また、溝の底面と透明カバーの外表面との間に段差が形成されていても差し支えなく、溝の底面に反射防止膜が付されていれば、観察窓に対する遮光性がより向上する。
【００１１】
また、溝が照明窓と観察窓の少なくとも一方の全周又は一部を囲む形状に形成されていても差し支えない。
【００１２】
【発明の実施の形態】
図面を参照して本発明の実施例を説明する。
図１において、１は、内視鏡の挿入部可撓管の先端部分であり、その先端に連結された先端部本体２の先端面に、光像をとり入れる観察窓３と照明光を射出する照明窓４とが並んで配置されている。照明窓４には凹レンズが嵌め込まれている。
【００１３】
観察窓３の内側には対物光学系５が配置され、その対物光学系５による被写体の投影位置にイメージガイドファイババンドル６の像入射面（又は固体撮像素子の撮像面）が配置されている。照明窓４の内側には、ライトガイドファイババンドル７の射出端が配置されている。
【００１４】
１０は、挿入部可撓管１に着脱自在に被覆される被覆シースであり、その先端部分には先端部本体２の先端面を被覆する例えばポリプロピレン又はポリエチレン等のような透明なプラスチックからなる透明カバー１１が取り付けられており、観察窓３と照明窓４とが同じ透明カバー１１により各々密着被覆された状態になっている。
【００１５】
そのような透明カバー１１は、全体として一定の厚みに形成されているが、透明カバー１１の照明窓４と観察窓３との間に位置する部分の外表面に、底面が照明窓４側から観察窓３側へ次第に深くなる斜面状に形成された溝１２が設けられている。
【００１６】
図２は、照明窓４と観察窓３を正面から見た内視鏡挿入部先端の正面図であり、溝１２は、二つ配置されている照明窓４の各々と観察窓３との間を透明カバー１１の先端面のほぼ全領域において仕切る仕切り溝状に形成されている。Ｉ−Ｉは図１に図示されている断面部分である。
【００１７】
このように構成された実施例の内視鏡の先端部においては、照明窓４から射出された照明光のうち大半の光は透明カバー１１を透過して被写体に照射されるが、一部の光は透明カバー１１の表面（例えば、図１に示されるＡ点）で反射されて透明カバー１１の厚み内に戻される。
【００１８】
しかし、そのような光が透明カバー１１に形成された溝１２の底面の裏側で反射されると、反射角度が次第に小さくなって最終的には途中から照明窓４側に戻されることになるので、透明カバー１１内で反射を繰り返す光は観察窓３に達しない。
【００１９】
また、照明窓４から射出された照明光のうち透明カバー１１の厚み内で観察窓３以外の方向に向かってから周辺部等で反射されて観察窓３に向かう光があるが、溝１２が照明窓４と観察窓３との間を透明カバー１１の先端面のほぼ全領域において仕切る態様に形成されているので、透明カバー１１の厚み内を通ってどの方向から来た光も、溝１２において、やって来た方向に戻されて観察窓３に達しない。
【００２０】
その結果、透明カバー１１の内面反射に起因するフレアーやゴーストの発生がほとんど皆無になり、観察窓３を通してコントラストのよい良好な観察像を得ることができる。
【００２１】
なお、本発明は上記実施例に限定されるものではなく、例えば図３に示されるように、溝１２の底面が曲面であってもよく、図４に示されるように、溝１２の底面が滑らかな凹面状であっても、その照明窓４寄りの部分が照明窓４側から観察窓３側へ次第に深くなっていればよい。
【００２２】
また、図５に示されるように、溝１２の底面と透明カバー１１の外表面との間に段差が形成されていてもよく、溝１２の底面に反射防止膜がコーティングされていれば、観察窓３に対する遮光性がより向上する。
【００２３】
また、図６に示されるように、溝１２が複数列設けられていてもよく、透明カバー１１の表面に対して各溝１２の底面のなす角度が相違していても差し支えない。
【００２４】
また、図７に示されるように、溝１２が、照明窓４と観察窓３の少なくとも一方の全周又は一部を囲む形状に形成されていても差し支えない。
【００２５】
【発明の効果】
本発明によれば、透明カバーの照明窓と観察窓との間に位置する部分の外表面に、底面が照明窓側から観察窓側へ次第に深くなる溝を、照明窓と観察窓との間を仕切る態様で形成したことにより、照明窓から射出された後、透明カバーの厚み内で反射を繰り返して観察窓に向かってあらゆる方向からやって来る光が観察窓に達しないので、フレアーやゴーストのない良好な観察像を得ることができる。
【図面の簡単な説明】
【図１】本発明の第１の実施例の内視鏡の先端部の側面断面図（図２におけるＩ−Ｉ断面図）である。
【図２】本発明の第１の実施例の内視鏡の先端部の正面図である。
【図３】本発明の第２の実施例の内視鏡の先端部の側面断面図である。
【図４】本発明の第３の実施例の内視鏡の先端部の側面断面図である。
【図５】本発明の第４の実施例の内視鏡の先端部の側面断面図である。
【図６】本発明の第５の実施例の内視鏡の先端部の側面断面図である。
【図７】本発明の第６の実施例の内視鏡の先端部の正面図である。
【図８】従来の内視鏡の先端部の側面断面図である。
【符号の説明】
１　挿入部可撓管
２　先端部本体
３　観察窓
４　照明窓
５　対物光学系
１０　被覆シース
１１　透明カバー
１２　溝[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a distal end portion of an endoscope, and particularly to a distal end portion of an endoscope in which an illumination window and an observation window provided at a distal end of an insertion portion are covered with the same transparent cover.
[0002]
[Prior art]
In recent years, there is an increasing need to reliably prevent infection from patient to patient via an endoscope.
[0003]
As a countermeasure, it is recommended to provide a detachable watertight sheath for the insertion section of the endoscope, use the endoscope covered with the sheath, and replace the sheath with a new one after use. This is one powerful means. In such a case, the sheath portion corresponding to the surfaces of the illumination window and the observation window must be formed transparent.
[0004]
However, when the surfaces of both windows are covered with one continuous transparent cover, for example, as shown in FIG. 8, the illumination light emitted from the illumination window 101 repeatedly reflects within the thickness of the transparent cover 102. The light enters the observation window 103, and flares and ghosts occur in the observation visual field.
[0005]
Therefore, conventionally, a transparent cover is gradually formed, for example, from the illumination window side to the observation window side, and when the light emitted from the illumination window repeats reflection in the direction toward the observation window side in the thickness of the transparent cover, the reflection angle gradually decreases. So as not to reach the observation window (Japanese Patent No. 2868228).
[0006]
[Problems to be solved by the invention]
However, even if measures such as forming the transparent cover from the illumination window side to the observation window side gradually thinner are taken, of the illumination light emitted from the illumination window toward the direction other than the observation window, the peripheral portion of the transparent cover, etc. When the light is reflected at the observation window and reaches the observation window, the light enters the observation window and flares and ghosts occur in the observation field.
[0007]
Therefore, the present invention provides a tip of an endoscope that can obtain a good observation image without flare or ghost at the tip of the endoscope in which the surface of the illumination window and the surface of the observation window are covered with the same transparent cover. The purpose is to provide a department.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the distal end portion of the endoscope of the present invention is arranged such that an illumination window for emitting illumination light and an observation window for taking in a light image are arranged side by side at the distal end of the insertion portion, and the surface of the illumination window At the distal end of the endoscope, the surface of the observation window is covered with the same transparent cover, the bottom surface gradually changes from the illumination window side to the observation window side on the outer surface of the portion of the transparent cover located between the illumination window and the observation window. The deepening groove is formed in such a manner as to partition between the illumination window and the observation window.
[0009]
In addition, the bottom surface of the groove may be a slope that gradually becomes deeper from the illumination window side to the observation window side, or even if the bottom surface of the groove is concave, the portion near the illumination window becomes gradually deeper from the illumination window side to the observation window side. It should just be.
[0010]
Further, a step may be formed between the bottom surface of the groove and the outer surface of the transparent cover. If an antireflection film is provided on the bottom surface of the groove, the light shielding property for the observation window is further improved.
[0011]
Further, the groove may be formed in a shape surrounding the entire circumference or a part of at least one of the illumination window and the observation window.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a distal end portion of an insertion section flexible tube of an endoscope, which emits an observation window 3 for taking in a light image and illumination light to a distal end surface of a distal end main body 2 connected to the distal end. The illumination windows 4 are arranged side by side. The illumination window 4 has a concave lens fitted therein.
[0013]
An objective optical system 5 is arranged inside the observation window 3, and an image incident surface of the image guide fiber bundle 6 (or an imaging surface of the solid-state image sensor) is arranged at a position where the object is projected by the objective optical system 5. The emission end of the light guide fiber bundle 7 is arranged inside the illumination window 4.
[0014]
Reference numeral 10 denotes a covering sheath which is detachably covered on the insertion portion flexible tube 1, and has a transparent portion made of a transparent plastic such as polypropylene or polyethylene which covers the distal end surface of the distal end body 2 at its distal end portion. The cover 11 is attached, and the observation window 3 and the illumination window 4 are in a state of being tightly covered with the same transparent cover 11, respectively.
[0015]
Such a transparent cover 11 is formed to have a certain thickness as a whole, but the bottom surface is located on the outer surface of the portion of the transparent cover 11 located between the illumination window 4 and the observation window 3 from the illumination window 4 side. A groove 12 formed in a slope shape that gradually becomes deeper toward the observation window 3 is provided.
[0016]
FIG. 2 is a front view of the distal end of the endoscope insertion portion when the illumination window 4 and the observation window 3 are viewed from the front, and a groove 12 is provided between each of the two arranged illumination windows 4 and the observation window 3. Is formed in the shape of a partition groove that partitions almost the entire area of the front end surface of the transparent cover 11. I-I is a section shown in FIG.
[0017]
At the distal end portion of the endoscope according to the embodiment configured as described above, most of the illumination light emitted from the illumination window 4 passes through the transparent cover 11 and irradiates the subject. The light is reflected by the surface of the transparent cover 11 (for example, point A shown in FIG. 1) and returned to the thickness of the transparent cover 11.
[0018]
However, when such light is reflected on the back side of the bottom surface of the groove 12 formed in the transparent cover 11, the reflection angle is gradually reduced, and eventually the light is returned to the illumination window 4 from the middle. Light that is repeatedly reflected in the transparent cover 11 does not reach the observation window 3.
[0019]
Also, among the illumination light emitted from the illumination window 4, there is light reflected in the peripheral portion and the like toward the observation window 3 from a direction other than the observation window 3 within the thickness of the transparent cover 11, but the groove 12 is not reflected. Since the space between the illumination window 4 and the observation window 3 is formed so as to partition substantially in the entire area of the front end surface of the transparent cover 11, light coming from any direction through the thickness of the transparent cover 11 is not affected by the groove 12. In, it is returned to the direction in which it has come and does not reach the observation window 3.
[0020]
As a result, almost no flare or ghost due to internal reflection of the transparent cover 11 is generated, and a good observation image with good contrast can be obtained through the observation window 3.
[0021]
Note that the present invention is not limited to the above-described embodiment. For example, as shown in FIG. 3, the bottom surface of the groove 12 may be a curved surface, and as shown in FIG. Even if it has a smooth concave shape, it is sufficient that the portion near the illumination window 4 gradually becomes deeper from the illumination window 4 side to the observation window 3 side.
[0022]
As shown in FIG. 5, a step may be formed between the bottom surface of the groove 12 and the outer surface of the transparent cover 11, and if the bottom surface of the groove 12 is coated with an antireflection film, The light shielding property for the window 3 is further improved.
[0023]
6, a plurality of rows of grooves 12 may be provided, and the angle formed by the bottom surface of each groove 12 with respect to the surface of the transparent cover 11 may be different.
[0024]
Further, as shown in FIG. 7, the groove 12 may be formed in a shape surrounding at least one of the illumination window 4 and the observation window 3 over the entire circumference or a part thereof.
[0025]
【The invention's effect】
According to the present invention, on the outer surface of the portion of the transparent cover located between the illumination window and the observation window, a groove whose bottom gradually becomes deeper from the illumination window side to the observation window side, partitions between the illumination window and the observation window. By being formed in the mode, after being emitted from the illumination window, light coming from all directions toward the observation window by repeatedly reflecting within the thickness of the transparent cover and reaching the observation window does not reach the observation window, so that there is no favorable flare or ghost. Observed images can be obtained.
[Brief description of the drawings]
FIG. 1 is a side sectional view (a II sectional view in FIG. 2) of a distal end portion of an endoscope according to a first embodiment of the present invention.
FIG. 2 is a front view of a distal end portion of the endoscope according to the first embodiment of the present invention.
FIG. 3 is a side sectional view of a distal end portion of an endoscope according to a second embodiment of the present invention.
FIG. 4 is a side sectional view of a distal end portion of an endoscope according to a third embodiment of the present invention.
FIG. 5 is a side sectional view of a distal end portion of an endoscope according to a fourth embodiment of the present invention.
FIG. 6 is a side sectional view of a distal end portion of an endoscope according to a fifth embodiment of the present invention.
FIG. 7 is a front view of a distal end portion of an endoscope according to a sixth embodiment of the present invention.
FIG. 8 is a side sectional view of a distal end portion of a conventional endoscope.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 insertion portion flexible tube 2 distal end body 3 observation window 4 illumination window 5 objective optical system 10 covering sheath 11 transparent cover 12 groove

Claims (6)

照明光を射出する照明窓と光像をとり入れる観察窓とが挿入部の先端に並んで配置され、上記照明窓の表面と上記観察窓の表面とが同じ透明カバーで被覆された内視鏡の先端部において、
上記透明カバーの上記照明窓と上記観察窓との間に位置する部分の外表面に、底面が上記照明窓側から上記観察窓側へ次第に深くなる溝を、上記照明窓と上記観察窓との間を仕切る態様で形成したことを特徴とする内視鏡の先端部。An illumination window for emitting illumination light and an observation window for taking in a light image are arranged side by side at the tip of the insertion section, and the surface of the illumination window and the surface of the observation window are covered with the same transparent cover. At the tip
On the outer surface of the portion of the transparent cover located between the illumination window and the observation window, a groove whose bottom gradually becomes deeper from the illumination window side to the observation window side is formed between the illumination window and the observation window. A distal end portion of an endoscope formed in a partitioning manner. 上記溝の底面が、上記照明窓側から上記観察窓側へ次第に深くなる斜面である請求項１記載の内視鏡の先端部。The distal end portion of the endoscope according to claim 1, wherein a bottom surface of the groove is a slope gradually deepening from the illumination window side to the observation window side. 上記溝の底面が凹面状である請求項１記載の内視鏡の先端部。2. The distal end of an endoscope according to claim 1, wherein the bottom surface of the groove is concave. 上記溝の底面と上記透明カバーの外表面との間に段差が形成されている請求項１、２又は３記載の内視鏡の先端部。4. The endoscope according to claim 1, wherein a step is formed between a bottom surface of the groove and an outer surface of the transparent cover. 上記溝の底面に反射防止膜が付されている請求項１、２、３又は４記載の内視鏡の先端部。The distal end portion of the endoscope according to claim 1, wherein an antireflection film is provided on a bottom surface of the groove. 上記溝が、上記照明窓と上記観察窓の少なくとも一方の全周又は一部を囲む形状に形成されている請求項１ないし５のいずれかの項に記載の内視鏡の先端部。The distal end portion of the endoscope according to any one of claims 1 to 5, wherein the groove is formed in a shape surrounding at least one of the illumination window and the observation window.
JP2002214884A 2002-07-24 2002-07-24 Tip part of endoscope Pending JP2004049793A (en)

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WO2020016980A1 (en) * 2018-07-19 2020-01-23 オリンパス株式会社 Distal end hood and endoscope system

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