JPH09220192A - Endoscope - Google Patents
EndoscopeInfo
- Publication number
- JPH09220192A JPH09220192A JP8317848A JP31784896A JPH09220192A JP H09220192 A JPH09220192 A JP H09220192A JP 8317848 A JP8317848 A JP 8317848A JP 31784896 A JP31784896 A JP 31784896A JP H09220192 A JPH09220192 A JP H09220192A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- tip
- endoscope
- distal end
- observation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Instruments For Viewing The Inside Of Hollow Bodies (AREA)
- Endoscopes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は医療用として用いら
れる内視鏡に関する。TECHNICAL FIELD The present invention relates to an endoscope used for medical purposes.
【０００２】[0002]
【従来の技術】一般に、医療用の内視鏡には患者の体内
に挿入される挿入部と、この挿入部の基端部に連結され
た手元側の操作部とが設けられている。さらに、図９
（Ａ），（Ｂ）に示すように先端部の先端面ｂには照明
光を照射する照明窓部ｃに配設された照明用レンズｄ、
観察用の観察窓部ｅに配設された観察用レンズｆ、洗浄
用ノズルｇ、鉗子チャンネルｈ等の複数の構成ユニット
が設けられている。2. Description of the Related Art Generally, a medical endoscope is provided with an insertion portion to be inserted into a patient's body and an operating portion on the hand side connected to a proximal end portion of the insertion portion. Further, FIG.
As shown in (A) and (B), on the tip surface b of the tip portion, an illumination lens d disposed in an illumination window portion c that emits illumination light,
A plurality of constituent units such as an observation lens f, a cleaning nozzle g, a forceps channel h, and the like arranged in the observation window portion e for observation are provided.
【０００３】また、例えば実開昭６４−３６８１６号公
報には先端部の先端面ｂに凸状の曲面を設け、その凸状
曲面の突出頂部に観察用レンズｆを配置することによ
り、照明用レンズｄから照射される照明光が観察用レン
ズｆに直射されることを防ぎ、観察像にフレヤーや、ゴ
ーストが生じることを避ける構成にしたものが示されて
いる。同時に、先端部の先端面ｂに凸状曲面の丸みをつ
けることによって先端部の挿入時の操作性を向上させる
ようになっている。Further, for example, in Japanese Utility Model Laid-Open No. 64-36816, a convex curved surface is provided on the front end surface b of the front end portion, and an observation lens f is arranged on the protruding top of the convex curved surface for illumination. The configuration is shown in which the illumination light emitted from the lens d is prevented from directly illuminating the observation lens f and flare or ghost is not generated in the observation image. At the same time, by rounding the convex curved surface on the tip surface b of the tip portion, the operability at the time of inserting the tip portion is improved.
【０００４】[0004]
【発明が解決しようとする課題】ところで、内視鏡の先
端部ａの外径寸法をできるだけ細くするためには、図９
（Ａ）に示すように、先端部の先端面ｂに配設されてい
る照明用レンズｄ、観察用レンズｆ、洗浄用ノズルｇ、
鉗子チャンネルｈ等の各構成ユニットを先端部の先端面
ｂ内にできるだけ近接させた状態で、適当に密接配置さ
せる必要がある。そのため、この場合には観察用レンズ
ｆは先端面ｂの中心軸Ｏの位置とは関係なく配置される
ので、先端面ｂの中心軸Ｏから偏心させた偏心位置に観
察用レンズｆが配置されることになる。By the way, in order to make the outer diameter of the distal end portion a of the endoscope as thin as possible, FIG.
As shown in (A), the illumination lens d, the observation lens f, the cleaning nozzle g, which are arranged on the tip surface b of the tip portion,
It is necessary to appropriately arrange the constituent units such as the forceps channel h and the like in the distal end surface b of the distal end portion as closely as possible. Therefore, in this case, the observation lens f is arranged regardless of the position of the central axis O of the front end surface b, and therefore the observation lens f is arranged at an eccentric position decentered from the central axis O of the front end surface b. Will be.
【０００５】ここで、実開昭６４−３６８１６号公報の
ように先端部の先端面ｂに突設された凸状曲面の突出頂
部に観察用レンズｆを配置させた場合には、先端部の外
径寸法を細径化するために、観察用レンズｆの中心軸
（光軸）を内視鏡の先端部の先端面ｂの中心軸Ｏの位置
から偏心させた偏心位置Ｏe に配置すると、それに伴っ
て先端面ｂの突出頂部の中心軸も先端面ｂの中心軸Ｏか
ら偏心させた偏心位置に配置されることになる。そのた
め、図９（Ｂ）に示すように先端部の先端面ｂの凸状曲
面の一部に凸状曲面の丸みの半径Ｒの大きさが小さい先
端尖り部分ｉができるので、内視鏡の先端部を挿入する
際に障害になるおそれがある。Here, when the observation lens f is arranged at the protruding top of the convex curved surface projecting from the tip surface b of the tip as in Japanese Utility Model Laid-Open No. 64-36816, when the observation lens f is arranged. In order to reduce the outer diameter, the central axis (optical axis) of the observing lens f is arranged at an eccentric position O e which is eccentric from the central axis O of the distal end surface b of the distal end portion of the endoscope. Accordingly, the central axis of the projecting apex of the front end surface b is also arranged at an eccentric position decentered from the central axis O of the front end surface b. Therefore, as shown in FIG. 9 (B), a tip sharpened portion i having a small radius R of the convex curved surface is formed in a part of the convex curved surface of the distal end surface b of the distal end portion. It may be an obstacle when inserting the tip.
【０００６】また、逆に図９（Ｃ）および図９（Ｄ）に
示すように観察用レンズｆを内視鏡の先端部における先
端面ｂの中心軸Ｏの位置に配置した場合には、図９
（Ｄ）に示すように先端部の先端面ｂにおいて凸状曲面
の丸みを先端面ｂの周方向全体に亙り均一に大きな半径
Ｒで形成することができる。On the contrary, when the observation lens f is arranged at the position of the central axis O of the distal end surface b at the distal end portion of the endoscope as shown in FIGS. 9 (C) and 9 (D), Figure 9
As shown in (D), a rounded convex curved surface can be formed on the tip surface b of the tip portion with a large radius R uniformly over the entire circumferential direction of the tip surface b.
【０００７】しかしながら、この場合には図９（Ｃ）に
示すように観察用レンズｆ以外の照明用レンズｄ、洗浄
用ノズルｇ、鉗子チャンネルｈ等の各構成ユニットが先
端部の先端面ｂにおける観察用レンズｆの外側に押し出
される状態で配置されるので、先端面ｂにおける各構成
ユニット間の間隔が図９（Ａ），（Ｂ）の場合よりも大
きくなり、先端部ａの外径寸法が大きくなる問題があ
る。However, in this case, as shown in FIG. 9C, each component unit such as the illuminating lens d other than the observing lens f, the cleaning nozzle g, the forceps channel h, etc. is provided on the tip surface b of the tip portion. Since they are arranged so as to be pushed out to the outside of the observation lens f, the distance between the respective constituent units on the tip surface b becomes larger than in the case of FIGS. 9A and 9B, and the outer diameter dimension of the tip portion a. There is a problem that becomes large.
【０００８】本発明は上記事情に着目してなされたもの
で、その目的は、先端部の外径寸法を格別に大きくする
ことなく、丸みの半径が大きい曲面状の凸部を先端面の
周方向全体に亙り均一に形成することができ、挿入性に
優れた内視鏡を提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is to form a curved convex portion having a large radius of roundness around the tip surface without increasing the outer diameter of the tip portion. An object of the present invention is to provide an endoscope which can be formed uniformly over the entire direction and has excellent insertability.
【０００９】[0009]
【課題を解決するための手段】本発明は先端部の先端面
に前記先端部の挿入方向に向かって曲面状の凸部を突設
し、前記先端部の挿入方向の略前方を視野とする観察用
レンズの中心を前記曲面状凸部の頂部より偏位させて配
設したものである。According to the present invention, a convex portion having a curved surface is provided on the tip surface of the tip portion in the insertion direction of the tip portion, and the field of view is approximately in front of the insertion direction of the tip portion. The observation lens is arranged so that the center of the observation lens is offset from the top of the curved convex portion.
【００１０】そして、先端部の先端面に突設した曲面状
凸部の頂部より偏位させて観察用レンズの中心をずらし
て配置することにより、先端部の先端面に配設される複
数の構成ユニットを先端部の先端面内にできるだけ近接
させた状態で適当に密接配置させ、先端部の外径寸法を
細くするとともに、内視鏡先端部の先端面の曲面状凸部
によって先端面の周方向全体に亙り均一に丸みの半径を
大きく形成することにより、挿入部の体腔内等への挿入
性を良くするようにしたものである。Then, by displacing the observation lens from the apex of the curved convex portion projecting on the tip surface of the tip portion and displacing the center of the observing lens, a plurality of tip portions are provided on the tip surface of the tip portion. The configuration unit is placed as close as possible to the tip surface of the tip part so as to be appropriately closely arranged to reduce the outer diameter of the tip part, and at the same time, the curved convex portion of the tip part of the endoscope tip part By making the radius of the roundness large uniformly over the entire circumferential direction, the insertability of the insertion portion into the body cavity or the like is improved.
【００１１】[0011]
【発明の実施の形態】以下、本発明の第１の実施の形態
を図１および図２（Ａ）を参照して説明する。図１は本
実施の形態におけるビデオ内視鏡システム（電子内視鏡
装置）１全体の概略構成を示すものである。なお、本実
施の形態では本発明をビデオ内視鏡に適用した例を示し
ているが本発明はビデオ内視鏡のみでなく、ファイバー
式内視鏡にも適用可能である。BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2 (A). FIG. 1 shows a schematic configuration of the entire video endoscope system (electronic endoscope apparatus) 1 according to the present embodiment. Although the present embodiment shows an example in which the present invention is applied to a video endoscope, the present invention can be applied not only to a video endoscope but also to a fiber type endoscope.
【００１２】図１のビデオ内視鏡システム１には電子内
視鏡２と、光源装置３と、ビデオプロセッサ４と、モニ
タ５と、ＶＴＲデッキ６と、ビデオディスク７と、ビデ
オプリンタ８とが設けられている。ここで、電子内視鏡
２には患者の体内に挿入される挿入部９と、この挿入部
９の基端部に連結された手元側の操作部１０とが設けら
れている。The video endoscope system 1 shown in FIG. 1 includes an electronic endoscope 2, a light source device 3, a video processor 4, a monitor 5, a VTR deck 6, a video disk 7, and a video printer 8. It is provided. Here, the electronic endoscope 2 is provided with an insertion portion 9 to be inserted into a patient's body, and a proximal operation portion 10 connected to a proximal end portion of the insertion portion 9.
【００１３】また、手元側の操作部１０にはユニバーサ
ルコード１１の一端部が連結されている。このユニバー
サルコード１１の他端部にはコネクタ部１２が連結され
ている。さらに、このコネクタ部１２には信号ケーブル
１３の一端部が連結されている。この信号ケーブル１３
の他端部には第２のコネクタ部１４が連結されている。
ここで、ユニバーサルコード１１のコネクタ部１２は光
源装置３に、また信号ケーブル１３の第２のコネクタ部
１４はビデオプロセッサ４にそれぞれ着脱可能に連結さ
れている。Also, one end of a universal cord 11 is connected to the operating portion 10 on the hand side. A connector 12 is connected to the other end of the universal cord 11. Further, one end of a signal cable 13 is connected to the connector portion 12. This signal cable 13
Is connected to a second connector section 14.
Here, the connector portion 12 of the universal cord 11 is detachably connected to the light source device 3, and the second connector portion 14 of the signal cable 13 is detachably connected to the video processor 4.
【００１４】そして、光源装置３内の光源ランプ１５か
ら放射された照明光は集光レンズ１６を経て電子内視鏡
２のライトガイド１７の入射端面に入射されるようにな
っている。さらに、このライトガイド１７を経て伝送さ
れる照明光は挿入部９の先端部側から外部側に照射され
るようになっている。The illumination light emitted from the light source lamp 15 in the light source device 3 passes through the condenser lens 16 and is incident on the incident end face of the light guide 17 of the electronic endoscope 2. Further, the illumination light transmitted through the light guide 17 is emitted from the distal end of the insertion section 9 to the outside.
【００１５】また、信号ケーブル１３の第２のコネクタ
部１４はビデオプロセッサ４に着脱可能に連結されてい
る。このビデオプロセッサ４にはモニタ５と、ＶＴＲデ
ッキ６と、ビデオディスク７と、ビデオプリンタ８とが
それぞれ接続されている。そして、電子内視鏡２によっ
て撮像される内視鏡像は図示しないＣＣＤ等の撮像装置
によって電気信号に変換された後、電子内視鏡２内の信
号線を介してビデオプロセッサ４に入力され、このビデ
オプロセッサ４内で信号処理された画像データがモニタ
５に表示されるとともに、必要に応じてＶＴＲデッキ
６、ビデオディスク７、ビデオプリンタ８に出力される
ようになっている。The second connector 14 of the signal cable 13 is detachably connected to the video processor 4. The video processor 4 is connected to a monitor 5, a VTR deck 6, a video disk 7, and a video printer 8, respectively. The endoscopic image taken by the electronic endoscope 2 is converted into an electric signal by an image pickup device such as a CCD (not shown), and then input to the video processor 4 via a signal line in the electronic endoscope 2. The image data signal-processed in the video processor 4 is displayed on the monitor 5 and, if necessary, is output to the VTR deck 6, the video disc 7, and the video printer 8.
【００１６】また、電子内視鏡２の挿入部９には基端部
が手元側操作部１０に連結された細長い可撓管部１８が
設けられている。さらに、この可撓管部１８の先端側に
は湾曲部１９を介して先端部２０が連結されている。そ
して、手元側操作部１０の操作によって湾曲部１９が遠
隔的に湾曲操作可能になっている。Further, the insertion portion 9 of the electronic endoscope 2 is provided with an elongated flexible tube portion 18 having a proximal end portion connected to the proximal side operation portion 10. Further, a distal end portion 20 is connected to a distal end side of the flexible tube portion 18 via a curved portion 19. The bending section 19 can be remotely bent by operating the near-side operation section 10.
【００１７】また、挿入部９の先端部２０の先端面２１
には図２（Ａ）に示すように挿入部９の挿入方向に向か
って略半球状の曲面状凸部２２が突設されている。この
曲面状凸部２２の頂部２３は先端部２０の先端面２１の
略中心軸Ｏ1 に配置されている。ここで、先端面２１の
略中心軸Ｏ1 とは先端部２０の先端面２１を正面から見
たときに、先端部２０の中心付近になる位置のことであ
る。Further, the tip surface 21 of the tip portion 20 of the insertion portion 9
As shown in FIG. 2 (A), a substantially hemispherical curved convex portion 22 is provided so as to project in the insertion direction of the insertion portion 9. The top portion 23 of the curved convex portion 22 is disposed on the substantially central axis O 1 of the tip end surface 21 of the tip end portion 20. Here, the substantially central axis O 1 of the front end surface 21 is a position near the center of the front end portion 20 when the front end surface 21 of the front end portion 20 is viewed from the front.
【００１８】また、先端面２１には観察用の観察窓部２
４が設けられている。この観察窓部２４の中心軸Ｏ2 は
先端部２０の中心軸Ｏ1 から偏心した偏心位置に配置さ
れている。さらに、観察窓部２４には観察用レンズ２５
が配置されている。この観察用レンズ２５は複数のレン
ズから構成されている。Further, the distal end surface 21 has an observation window portion 2 for observation.
4 are provided. The central axis O 2 of the observation window portion 24 is arranged at an eccentric position eccentric from the central axis O 1 of the tip portion 20. Further, the observation window 25 has an observation lens 25.
Is arranged. The observation lens 25 is composed of a plurality of lenses.
【００１９】また、観察用レンズ２５の最先端位置に配
置された第１レンズ２６の外面には、先端部２０の曲面
状凸部２２の曲面形状に沿う曲面形状に加工された加工
曲面２６ａが形成されている。そして、先端部２０に第
１レンズ２６を組付けた際に先端部２０の曲面状凸部２
２の曲面形状と第１レンズ２６の加工曲面２６ａとが滑
らかにつながるようになっている。On the outer surface of the first lens 26 arranged at the most distal end of the observing lens 25, there is a processed curved surface 26a processed into a curved shape along the curved shape of the curved convex portion 22 of the tip 20. Has been formed. Then, when the first lens 26 is attached to the tip portion 20, the curved convex portion 2 of the tip portion 20 is attached.
The curved surface shape 2 and the processed curved surface 26a of the first lens 26 are smoothly connected.
【００２０】なお、挿入部９の先端部２０の先端面２１
には観察窓部２４の観察用レンズ２５とともに、照明窓
部ｃの照明用レンズｄ、洗浄用ノズルｇ、鉗子チャンネ
ルｈ等の複数の構成ユニットができるだけ近接させた状
態で適当に密接配置されている（図９（Ａ），（Ｂ）参
照）。ここで、鉗子チャンネルｈの基端部は電子内視鏡
２の手元側操作部１０に設けられた処置具挿入口体２７
に連結されている。The tip surface 21 of the tip portion 20 of the insertion portion 9
In addition to the observation lens 25 of the observation window portion 24, a plurality of constituent units such as the illumination lens d of the illumination window portion c, the cleaning nozzle g, and the forceps channel h are appropriately arranged in close proximity to each other. (See FIGS. 9A and 9B). Here, the proximal end portion of the forceps channel h is a treatment instrument insertion port body 27 provided on the proximal side operation unit 10 of the electronic endoscope 2.
It is connected to.
【００２１】そこで、上記構成のものにあっては次の効
果を奏する。すなわち、挿入部９の先端部２０の先端面
２１に配置された観察用レンズ２５は、先端部２０の先
端面２１のうち曲面状凸部２２の頂部２３以外の任意の
位置に配置することができるので、先端面２１に観察窓
部２４の観察用レンズ２５とともに配設される照明窓部
ｃの照明用レンズｄ、洗浄用ノズルｇ、鉗子チャンネル
ｈ等の複数の構成ユニットをできるだけ近接させた状態
で適当に密接配置させることができる。そのため、先端
部２０の各内蔵物のレイアウトを自由に決めることがで
きるので、挿入部９の先端部２０の外径寸法を細径化す
ることができる。Therefore, the above configuration has the following effects. That is, the observation lens 25 arranged on the distal end surface 21 of the distal end portion 20 of the insertion portion 9 may be disposed at any position on the distal end surface 21 of the distal end portion 20 other than the top portion 23 of the curved convex portion 22. Therefore, the plurality of constituent units such as the illumination lens d of the illumination window c, the cleaning nozzle g, and the forceps channel h, which are arranged together with the observation lens 25 of the observation window portion 24, are arranged as close as possible to the tip surface 21. They can be arranged in close proximity to each other as appropriate. Therefore, it is possible to freely determine the layout of the internal parts of the distal end portion 20, so that the outer diameter dimension of the distal end portion 20 of the insertion portion 9 can be reduced.
【００２２】さらに、先端部２０の先端面２１の曲面状
凸部２２の頂部２３を先端部２０の先端面２１の略中心
軸Ｏ1 に配置したので、この曲面状凸部２２によって先
端面２１の周方向全体に亙り丸みの半径Ｒを均一に大き
く形成することができる。そのため、先端面２１の突出
頂部の中心軸が先端面２１の中心軸Ｏ1 から偏心させた
偏心位置に配置される場合に比べて電子内視鏡２の挿入
部９を体腔内等に挿入する際の挿入性を良くすることが
できる。Further, since the apex 23 of the curved convex portion 22 of the distal end surface 21 of the distal end portion 20 is arranged on the substantially central axis O 1 of the distal end surface 21 of the distal end portion 20, the distal end surface 21 is formed by the curved convex portion 22. The radius R of the roundness can be uniformly increased over the entire circumferential direction. Therefore, the insertion portion 9 of the electronic endoscope 2 is inserted into the body cavity or the like as compared with the case where the central axis of the protruding apex of the distal end surface 21 is arranged at an eccentric position decentered from the central axis O 1 of the distal end surface 21. The insertability at the time can be improved.
【００２３】また、観察用レンズ２５の第１レンズ２６
の外面に先端部２０の曲面状凸部２２の曲面形状に沿う
曲面形状に加工された加工曲面２６ａを形成し、先端部
２０に第１レンズ２６を組付けた際に先端部２０の曲面
状凸部２２の曲面形状と第１レンズ２６の加工曲面２６
ａとが滑らかにつながるようにしたので、先端部２０の
曲面状凸部２２の曲面形状に沿う丸みの半径Ｒをを大き
くすることできる。The first lens 26 of the observation lens 25 is also used.
A processed curved surface 26a formed into a curved shape along the curved shape of the curved convex portion 22 of the tip portion 20, and the curved shape of the tip portion 20 when the first lens 26 is attached to the tip portion 20. The curved surface shape of the convex portion 22 and the processed curved surface 26 of the first lens 26
Since a is smoothly connected to a, the radius R of the roundness along the curved surface shape of the curved convex portion 22 of the tip portion 20 can be increased.
【００２４】また、図２（Ｂ）は第１の実施の形態の内
視鏡２の第１の変形例を示すものである。これは、観察
窓部２４の観察用レンズ２５をその一部が曲面状凸部２
２の頂部２３の中心軸Ｏ1 に重なる状態で先端面２１に
配置したものである。この場合も、第１の実施の形態の
内視鏡２と同様な効果が得られる。FIG. 2B shows a first modified example of the endoscope 2 of the first embodiment. This is because the observation lens 25 of the observation window 24 has a curved convex portion 2
It is arranged on the front end face 21 in a state of overlapping with the central axis O 1 of the second top 23. Also in this case, the same effect as that of the endoscope 2 of the first embodiment can be obtained.
【００２５】また、図２（Ｃ）は第１の実施の形態の内
視鏡２の第２の変形例を示すものである。これは、第１
の実施の形態における観察用レンズ２５の第１レンズ２
６の外面に先端部２０の曲面状凸部２２の曲面形状に沿
う曲面形状に近似的に見なせるような角度の平面で斜め
にカットされた傾斜面２６ｂを形成したものである。そ
して、先端部２０に第１レンズ２６を組付けた際に先端
部２０の曲面状凸部２２の曲面形状と第１レンズ２６の
傾斜面２６ｂとの接合部間に大きな段差が形成されない
状態で滑らかにつながるようになっている。FIG. 2C shows a second modification of the endoscope 2 according to the first embodiment. This is the first
First lens 2 of observation lens 25 in the embodiment
On the outer surface of No. 6, an inclined surface 26b is formed which is obliquely cut by a plane having an angle that can be approximately regarded as a curved surface shape along the curved surface shape of the curved convex portion 22 of the tip portion 20. Then, when the first lens 26 is attached to the distal end portion 20, a large step is not formed between the curved surface shape of the curved convex portion 22 of the distal end portion 20 and the inclined surface 26b of the first lens 26. It is designed to connect smoothly.
【００２６】そこで、上記構成のものにあっては観察用
レンズ２５の第１レンズ２６は外面に斜めに平面でカッ
トされた傾斜面２６ｂを形成するだけで製作できるの
で、第１の実施の形態における第１レンズ２６の加工曲
面２６ａのように第１レンズ２６の外面に曲面を形成す
る場合に比べて簡単な加工で済む。そのため、加工の容
易な第１レンズ２６を用いることができるため、第１レ
ンズ２６の加工にかかるコスト、時間が節約できる。Therefore, in the above-mentioned structure, the first lens 26 of the observing lens 25 can be manufactured only by forming the inclined surface 26b which is obliquely cut into a flat surface on the outer surface. The processing is simpler than the case where a curved surface is formed on the outer surface of the first lens 26 like the processed curved surface 26a of the first lens 26 in FIG. Therefore, since the first lens 26 that can be easily processed can be used, the cost and time required for processing the first lens 26 can be saved.
【００２７】また、図３（Ａ）は本発明の第２の実施の
形態を示すものである。これは、第１の実施の形態の内
視鏡２の観察窓部２４における観察用レンズ２５の中心
軸Ｏ2 を先端部２０の中心軸Ｏ1 に対して傾けて配置し
たものである。ここで、観察用レンズ２５の中心軸Ｏ2
は先端部２０の曲面状凸部２２の曲面との交点でこの曲
面の接線に対して直交状態で交差するように設定されて
いる。Further, FIG. 3A shows a second embodiment of the present invention. This is arranged such that the central axis O 2 of the observation lens 25 in the observation window portion 24 of the endoscope 2 of the first embodiment is inclined with respect to the central axis O 1 of the distal end portion 20. Here, the central axis O 2 of the observation lens 25
Is set so that it intersects with the curved surface of the curved convex portion 22 of the tip portion 20 in a state orthogonal to the tangent line of this curved surface.
【００２８】さらに、この観察用レンズ２５の第１レン
ズ２６としてはレンズ本体の外面に先端部２０の曲面状
凸部２２の曲面形状に沿う曲面形状に加工された加工曲
面２６ｃが形成された軸対称凸状レンズが用いられてい
る。そして、先端部２０に第１レンズ２６を組付けた際
に先端部２０の曲面状凸部２２の曲面形状と第１レンズ
２６の加工曲面２６ｃとが滑らかにつながるようになっ
ている。Further, as the first lens 26 of the observing lens 25, a shaft having a processed curved surface 26c formed into a curved shape along the curved shape of the curved convex portion 22 of the tip portion 20 is formed on the outer surface of the lens body. A symmetrical convex lens is used. When the first lens 26 is attached to the tip portion 20, the curved shape of the curved convex portion 22 of the tip portion 20 and the processed curved surface 26c of the first lens 26 are smoothly connected.
【００２９】そこで、上記構成のものにあっては次の効
果を奏する。すなわち、観察用レンズ２５の第１レンズ
２６として軸対称凸状レンズを用いているので、第１レ
ンズ２６の加工曲面２６ｃの加工が容易となる。そのた
め、第１の実施の形態における第１レンズ２６の加工曲
面２６ａのように第１レンズ２６の外面にレンズ本体の
中心軸に対して非対称な加工曲面２６ａを形成する場合
に比べて簡単な加工で済むので、第１レンズ２６を簡単
に製造することができ、第１レンズ２６の加工にかかる
コスト、時間が節約できるとともに、映像の歪みも非軸
対称になることがない。Therefore, the following effects are obtained with the above-mentioned structure. That is, since the axisymmetric convex lens is used as the first lens 26 of the observation lens 25, the processing curved surface 26c of the first lens 26 can be easily processed. Therefore, as compared with the case where the processed curved surface 26a of the first lens 26 in the first embodiment is formed, the processed curved surface 26a which is asymmetric with respect to the central axis of the lens body is formed on the outer surface of the first lens 26. Therefore, the first lens 26 can be easily manufactured, the cost and time required for processing the first lens 26 can be saved, and the image distortion does not become non-axisymmetric.
【００３０】また、図３（Ｂ）は第２の実施の形態の内
視鏡２の変形例を示すものである。これは、第２の実施
の形態における観察用レンズ２５の第１レンズ２６とし
て軸対称平面レンズを用いたものである。そして、先端
部２０に第１レンズ２６を組付けた際に先端部２０の曲
面状凸部２２の曲面形状と第１レンズ２６のレンズ本体
の外面の平面２６ｄとの接合部間に大きな段差が形成さ
れない状態で滑らかにつながるように組付けられてい
る。FIG. 3B shows a modified example of the endoscope 2 of the second embodiment. This uses an axially symmetric plane lens as the first lens 26 of the observation lens 25 in the second embodiment. When the first lens 26 is attached to the tip portion 20, a large step is formed between the curved surface shape of the curved convex portion 22 of the tip portion 20 and the flat surface 26d of the outer surface of the lens body of the first lens 26. It is assembled so that it can be connected smoothly without being formed.
【００３１】そこで、上記構成のものにあっては観察用
レンズ２５の第１レンズ２６として製造の簡単な軸対称
平面レンズを用いることができるので、第１レンズ２６
の加工にかかるコスト、時間が一層節約できるととも
に、映像の歪みも防止することができる。Therefore, in the above-mentioned structure, since a simple axially symmetric plane lens can be used as the first lens 26 of the observation lens 25, the first lens 26 can be used.
It is possible to further reduce the cost and time required for processing, and prevent image distortion.
【００３２】また、図４（Ａ）は本発明の第３の実施の
形態を示すものである。これは、第１の実施の形態の内
視鏡２における先端部２０の先端面２１の曲面状凸部２
２の中心軸Ｏ1 から偏心した偏心位置に観察窓部２４の
観察用レンズ２５および前方を照射する照明窓部３１の
照明用レンズ３２をそれぞれ配置したものである。ここ
で、先端部２０の本体３３における観察用レンズ２５の
装着孔３４と、照明用レンズ３２の装着孔３５との間の
仕切り壁部３６の先端側は観察用レンズ２５の中心軸Ｏ
2 と照明用レンズ３２の中心軸Ｏ3 とを含む平面上にお
いて、照明用レンズ３２の固定位置よりも前方に突出す
る状態に形成されている。なお、照明用レンズ３２の後
面には照明光を伝送するライトガイド１７の先端部が対
向配置されている。FIG. 4A shows the third embodiment of the present invention. This is the curved convex portion 2 of the distal end surface 21 of the distal end portion 20 in the endoscope 2 of the first embodiment.
The observing lens 25 of the observing window 24 and the illuminating lens 32 of the illuminating window 31 for irradiating the front are arranged at eccentric positions eccentric from the central axis O 1 of 2. Here, the front end side of the partition wall portion 36 between the mounting hole 34 of the observation lens 25 and the mounting hole 35 of the illumination lens 32 in the main body 33 of the distal end portion 20 is the central axis O of the observation lens 25.
On a plane including 2 and the central axis O 3 of the illuminating lens 32, it is formed so as to project forward from the fixed position of the illuminating lens 32. The front end of the light guide 17 that transmits the illumination light is arranged to face the rear surface of the illumination lens 32.
【００３３】また、観察用レンズ２５の最先端位置に配
置された第１レンズ２６の外面および照明用レンズ３２
の外面には、先端部２０の曲面状凸部２２の曲面形状に
沿う曲面形状に加工された加工曲面２６ａ，３２ａがそ
れぞれ形成されている。そして、先端部２０に第１レン
ズ２６および照明用レンズ３２を組付けた際に先端部２
０の曲面状凸部２２の曲面形状と、第１レンズ２６の加
工曲面２６ａおよび照明用レンズ３２の加工曲面３２ａ
とが滑らかにつながるようになっている。The outer surface of the first lens 26 and the illuminating lens 32 which are arranged at the most distal end of the observing lens 25.
Processed curved surfaces 26a, 32a are formed on the outer surfaces of the curved surfaces 26a and 32a, respectively, in a curved shape along the curved shape of the curved convex portion 22 of the tip portion 20. Then, when the first lens 26 and the illuminating lens 32 are assembled to the tip portion 20, the tip portion 2
The curved surface shape of the curved convex portion 22 of 0, the processed curved surface 26a of the first lens 26, and the processed curved surface 32a of the illumination lens 32.
And are connected smoothly.
【００３４】そこで、上記構成のものにあっては次の効
果を奏する。すなわち、観察用レンズ２５の装着孔３４
と、照明用レンズ３２の装着孔３５との間の仕切り壁部
３６の先端側は観察用レンズ２５の中心軸Ｏ2 と照明用
レンズ３２の中心軸Ｏ3 とを含む平面上において、照明
用レンズ３２の固定位置よりも前方に突出されているの
で、照明用レンズ３２から照射される照明光が観察用レ
ンズ２５に直接入射されることが仕切り壁部３６の先端
側によって遮られる。そのため、照明用レンズ３２から
照射される照明光が観察用レンズ２５に直接入射される
ことがないので、内視鏡像にフレヤーや、ゴースト等の
現象が生じることを防ぐ事が出来る。Therefore, the above configuration has the following effects. That is, the mounting hole 34 of the observation lens 25
When, on a plane distal end side of the partition wall 36 between the attachment hole 35 of the illumination lens 32 including the central axis O 3 of the central axis O 2 and the illumination lens 32 of the observation lens 25, illuminating Since the lens 32 projects forward from the fixed position of the lens 32, the front end side of the partition wall portion 36 blocks the illumination light emitted from the illumination lens 32 from directly entering the observation lens 25. Therefore, since the illumination light emitted from the illumination lens 32 does not directly enter the observation lens 25, it is possible to prevent a phenomenon such as flare or ghost from occurring in the endoscopic image.
【００３５】また、図４（Ｂ）は本発明の第４の実施の
形態を示すものである。これは、第１の実施の形態の内
視鏡２における先端部２０の先端面２１の曲面状凸部２
２の中心軸Ｏ1 付近に洗浄用ノズル４１を配設したもの
である。この洗浄用ノズル４１のノズル噴出口４２は観
察用レンズ２５の第１レンズ２６の先端面の位置より前
方に突出した位置に配置されている。さらに、この洗浄
用ノズル４１はノズル噴出口４２を観察用レンズ２５の
第１レンズ２６の先端面に向けた状態で固定されてい
る。そして、この噴出口４２から洗浄用流体を観察用レ
ンズ２５の第１レンズ２６の先端面に吹き付ける事によ
り、第１レンズ２６の先端面を洗浄して内視鏡２の観察
視野を確保できるようにしている。Further, FIG. 4B shows a fourth embodiment of the present invention. This is the curved convex portion 2 of the distal end surface 21 of the distal end portion 20 in the endoscope 2 of the first embodiment.
The cleaning nozzle 41 is disposed near the central axis O 1 of the second nozzle. The nozzle ejection port 42 of the cleaning nozzle 41 is arranged at a position projecting forward from the position of the tip surface of the first lens 26 of the observation lens 25. Further, the cleaning nozzle 41 is fixed in a state where the nozzle ejection port 42 is directed toward the tip surface of the first lens 26 of the observation lens 25. Then, by spraying a cleaning fluid from the ejection port 42 onto the tip surface of the first lens 26 of the observation lens 25, the tip surface of the first lens 26 is cleaned so that the observation field of view of the endoscope 2 can be secured. I have to.
【００３６】そこで、上記構成のものにあっては次の効
果を奏する。すなわち、先端部２０の先端面２１の曲面
状凸部２２の中心軸Ｏ1 付近に洗浄用ノズル４１を配設
したので、洗浄用ノズル４１が内視鏡２の先端部２０の
外周面側に突出されるおそれがない、そのため、内視鏡
２の先端部２０を体腔内の小穴に挿入させる際に、洗浄
用ノズル４１が体腔内の小穴の内壁面等に接触するおそ
れがないので、洗浄用ノズル４１が体腔内の小穴の内壁
面等に引っ掛かることなく内視鏡２の先端部２０を容易
に体腔内の小穴に挿入できる。Therefore, the above configuration has the following effects. That is, since the cleaning nozzle 41 is disposed in the vicinity of the central axis O 1 of the curved convex portion 22 of the distal end surface 21 of the distal end portion 20, the cleaning nozzle 41 is located on the outer peripheral surface side of the distal end portion 20 of the endoscope 2. There is no possibility of being projected, and therefore, when inserting the distal end portion 20 of the endoscope 2 into a small hole in a body cavity, there is no risk of the cleaning nozzle 41 coming into contact with the inner wall surface of the small hole in the body cavity, etc. The distal end portion 20 of the endoscope 2 can be easily inserted into the small hole in the body cavity without the use nozzle 41 being caught on the inner wall surface of the small hole in the body cavity.
【００３７】ここで、一般に、内視鏡２の挿入部９の先
端部２０のような円筒状の物体がその円筒の外径寸法と
ほぼ同じ大きさの内径寸法の小穴を通過する際には、円
筒状の物体の外周面が小穴の内壁面に接触する。このた
め、円筒状をした内視鏡２の先端部２０の外周部に小突
起がある場合には、内視鏡２の先端部２０が体腔内の小
穴を通過する際に体壁等に小突起が引っかかり、内視鏡
２の挿入性・安全性を損なわせるおそれがある。これに
対し、本実施の形態では洗浄用ノズル４１が体壁等に引
っ掛かることがないので、内視鏡２の挿入が安全かつ容
易になる。Here, in general, when a cylindrical object such as the distal end portion 20 of the insertion portion 9 of the endoscope 2 passes through a small hole having an inner diameter dimension substantially the same as the outer diameter dimension of the cylinder. The outer peripheral surface of the cylindrical object contacts the inner wall surface of the small hole. Therefore, when there is a small protrusion on the outer peripheral portion of the distal end portion 20 of the endoscope 2 having a cylindrical shape, when the distal end portion 20 of the endoscope 2 passes through a small hole in a body cavity, it is small on a body wall or the like. The projection may be caught, and the insertability and safety of the endoscope 2 may be impaired. On the other hand, in the present embodiment, since the cleaning nozzle 41 is not caught on the body wall or the like, the insertion of the endoscope 2 is safe and easy.
【００３８】なお、洗浄用ノズル４１の中心軸は必ずし
も先端部２０の先端面２１の曲面状凸部２２の中心軸Ｏ
1 を通る必要はなく、少なくとも先端部２０の曲面状凸
部２２の曲面形状より前方に突出している洗浄用ノズル
４１のノズル噴出口４２の部分が、曲面状凸部２２の中
心軸Ｏ1 の付近に配置されていれば同様の効果が得られ
る。The central axis of the cleaning nozzle 41 is not necessarily the central axis O of the curved convex portion 22 of the tip surface 21 of the tip portion 20.
It is not necessary to pass through 1 and at least the portion of the nozzle ejection port 42 of the cleaning nozzle 41 projecting forward from the curved shape of the curved convex portion 22 of the tip portion 20 has the central axis O 1 of the curved convex portion 22. Similar effects can be obtained if they are located nearby.
【００３９】また、図５（Ａ）は本発明の第５の実施の
形態を示すものである。これは、先端部２０の先端面２
１に半径Ｒが２〜５ｍｍ程度の面取りを施して曲面状凸
部２２を形成したものである。FIG. 5 (A) shows a fifth embodiment of the present invention. This is the tip surface 2 of the tip 20.
1 is chamfered with a radius R of about 2 to 5 mm to form a curved convex portion 22.
【００４０】そこで、上記構成のものにあっては先端部
２０の曲面状凸部２２を先端面２１に半径Ｒが２〜５ｍ
ｍ程度の面取りを施すことにより形成したので、内視鏡
２の挿入部９を体腔内に挿入する際に挿入部９の先端部
２０の角部が体腔内の内壁面等に引っ掛かることがな
く、内視鏡２の操作が安全かつ容易になる。Therefore, in the above-mentioned structure, the curved convex portion 22 of the tip portion 20 has a radius R of 2 to 5 m on the tip surface 21.
Since it is formed by chamfering about m, when inserting the insertion portion 9 of the endoscope 2 into the body cavity, the corners of the tip 20 of the insertion portion 9 do not get caught on the inner wall surface or the like in the body cavity. The operation of the endoscope 2 becomes safe and easy.
【００４１】なお、先端部２０の先端面２１の角部の面
取りを半径Ｒが０〜２ｍｍ程度で行った場合には、先端
部２０の先端面２１の角部には尖りが形成されるので、
内視鏡２の挿入部９を咽頭や、体腔内のその他の小穴を
通過させる際に、先端部２０の先端面２１の角部が体壁
等に引っ掛かり易く、内視鏡２の挿入部９の挿入が難し
くなるおそれがある。しかし、本実施の形態のように先
端部２０の先端面２１に半径Ｒが２〜５ｍｍ程度の面取
りを施して曲面状凸部２２を形成することにより、先端
部２０の先端面２１の尖りはゆるくなるので、内視鏡２
の挿入部９の挿入が容易になる。When chamfering the corner portion of the tip surface 21 of the tip portion 20 with a radius R of about 0 to 2 mm, a sharp point is formed at the corner portion of the tip surface 21 of the tip portion 20. ,
When the insertion portion 9 of the endoscope 2 is passed through the pharynx and other small holes in the body cavity, the corners of the distal end surface 21 of the distal end portion 20 are easily caught by the body wall or the like, and the insertion portion 9 of the endoscope 2 is inserted. May be difficult to insert. However, as in the present embodiment, by chamfering the tip end surface 21 of the tip end portion 20 with a radius R of about 2 to 5 mm to form the curved convex portion 22, the sharpness of the tip end surface 21 of the tip end portion 20 is reduced. Endoscope 2 because it becomes loose
It becomes easy to insert the insertion portion 9 of.
【００４２】また、通常、内視鏡２の先端部２０の外径
寸法は直径φが１０ｍｍ前後であるので、先端部２０の
先端面２１の面取りを半径Ｒが５ｍｍより大きくした場
合には、図５（Ｂ）に示すように先端面２１の曲面状凸
部２２の一部（先端）に尖り部５１が形成される問題が
ある。したがって、本実施の形態のように先端部２０の
先端面２１の面取りの半径Ｒを２〜５ｍｍ程度に設定す
ることにより、先端面２１の曲面状凸部２２の一部（先
端）に図５（Ｂ）に示すような尖り部５１が形成される
ことを防止することができる。Further, since the outer diameter of the distal end portion 20 of the endoscope 2 is usually about 10 mm in diameter φ, when the chamfering of the distal end surface 21 of the distal end portion 20 has a radius R larger than 5 mm, As shown in FIG. 5B, there is a problem that a sharp portion 51 is formed on a part (tip) of the curved convex portion 22 of the tip surface 21. Therefore, by setting the chamfering radius R of the distal end surface 21 of the distal end portion 20 to about 2 to 5 mm as in the present embodiment, a part (the distal end) of the curved convex portion 22 of the distal end surface 21 is formed as shown in FIG. It is possible to prevent the sharp portion 51 as shown in (B) from being formed.
【００４３】また、図６（Ａ），（Ｂ）は本発明の第６
の実施の形態を示すものである。これは、内視鏡２の先
端部２０に取付けられた観察用レンズ２５の第１レンズ
２６の外面における内視鏡像の映像形成に使用している
映像形成部分６１以外の不使用領域部分６２のみに先端
部２０の曲面状凸部２２の曲面形状に沿う曲面形状に加
工された加工曲面６２ａを形成し、それ以外は軸対称レ
ンズとしたものである。Further, FIGS. 6A and 6B show the sixth embodiment of the present invention.
FIG. This is only the non-use area portion 62 other than the image forming portion 61 used for forming the image of the endoscopic image on the outer surface of the first lens 26 of the observation lens 25 attached to the distal end portion 20 of the endoscope 2. A processed curved surface 62a, which is processed into a curved shape along the curved shape of the curved convex portion 22 of the tip 20, is formed, and the other parts are axisymmetric lenses.
【００４４】なお、内視鏡２では、通常、図６（Ｂ）に
示すように観察用レンズ２５の視野範囲のうち中央側の
一部の映像形成部分６１だけが映像形成用として利用さ
れ、この映像形成部分６１の外側領域の部分は内視鏡像
の映像形成に使用されない不使用領域部分６２となって
いる。そして、本実施の形態では不使用領域部分６２の
みに先端部２０の曲面状凸部２２の曲面形状に沿う曲面
形状に加工された加工曲面６２ａを形成するようにした
ものである。In the endoscope 2, as shown in FIG. 6B, normally, only a part of the image forming portion 61 on the center side in the visual field range of the observing lens 25 is used for image forming. A portion of the outer area of the image forming portion 61 is a non-use area portion 62 which is not used for forming an image of an endoscopic image. Further, in the present embodiment, the processed curved surface 62a is formed only in the unused area portion 62 so as to have a curved surface shape along the curved surface shape of the curved convex portion 22 of the tip portion 20.
【００４５】そこで、上記構成のものにあっては次の効
果を奏する。すなわち、一般に、非軸対称形状のレンズ
面を通過した映像では、その映像自体が非点対称の歪を
起こす問題があるが、本実施の形態のように、観察用レ
ンズ２５の第１レンズ２６の外面のうち、映像として使
用されない不使用領域部分６２のみに、先端部２０の曲
面状凸部２２の曲面形状に沿う曲面形状に加工された加
工曲面６２ａを形成することにより、映像形成部分６１
によって形成される映像は非点対称には歪まない。その
ため、鮮明な内視鏡像を得ることができる。Therefore, the above configuration has the following effects. That is, in general, an image passing through a lens surface having a non-axisymmetric shape has a problem that the image itself causes asymmetric distortion, but like the present embodiment, the first lens 26 of the observation lens 25 is used. Of the outer surface of the image forming portion 61, only the unused area portion 62 not used as an image is formed with the processing curved surface 62a processed into the curved surface shape along the curved surface shape of the curved convex portion 22 of the tip portion 20, thereby forming the image forming portion 61.
The image formed by does not distort symmetrically. Therefore, a clear endoscopic image can be obtained.
【００４６】さらに、本実施の形態のように、観察用レ
ンズ２５の第１レンズ２６の外面のうち、不使用領域部
分６２には先端部２０の曲面状凸部２２の曲面形状に沿
う曲面形状に加工された加工曲面６２ａを形成したの
で、観察用レンズ２５の一部まで先端部２０の面取りを
広げることができる。そのため、観察用レンズ２５の第
１レンズ２６によって形成される内視鏡像の映像を非点
対称に歪ませることなく、先端部２０の面取りを大きく
することができ、内視鏡２の挿入部９の挿入性・安全性
を向上させることができる。Further, as in this embodiment, in the unused area portion 62 of the outer surface of the first lens 26 of the observing lens 25, a curved surface shape along the curved surface shape of the curved convex portion 22 of the tip portion 20 is formed. Since the processed curved surface 62a is formed as described above, the chamfering of the distal end portion 20 can be extended to a part of the observation lens 25. Therefore, the chamfer of the distal end portion 20 can be increased without distorting the image of the endoscopic image formed by the first lens 26 of the observation lens 25 in an asymmetric manner, and the insertion portion 9 of the endoscope 2 can be obtained. The insertability and safety of can be improved.
【００４７】また、図７（Ａ）は本発明の第７の実施の
形態を示すものである。これは、内視鏡２の挿入部９の
先端部２０の先端面に凸状突出頂部７１を設けるととも
に、その突出頂部７１より後方側に観察用レンズ２５の
第１レンズ２６の外面側のレンズ面７２を配置したもの
である。この第１レンズ２６の外面側のレンズ面７２は
楔状に斜めにカットして角度をつけた平面によって形成
されている。ここで、第１レンズ２６のレンズ面７２の
視野方向Ｐは光の屈折の法則により内視鏡２の挿入部９
の挿入方向に対し、先端部２０の突出頂部７１の前方方
向を見るように突出頂部７１側に傾けられている。Further, FIG. 7A shows a seventh embodiment of the present invention. This is because a convex protruding top portion 71 is provided on the tip end surface of the tip end portion 20 of the insertion portion 9 of the endoscope 2, and a lens on the outer surface side of the first lens 26 of the observation lens 25 is located behind the protruding top portion 71. The surface 72 is arranged. The outer lens surface 72 of the first lens 26 is formed by a flat surface that is obliquely cut in a wedge shape and is angled. Here, the viewing direction P of the lens surface 72 of the first lens 26 is determined by the law of refraction of light according to the insertion portion 9 of the endoscope 2.
With respect to the insertion direction of, the front end 20 is inclined toward the protruding top portion 71 side so that the front direction of the protruding top portion 71 is seen.
【００４８】なお、突出頂部７１の前方方向とは、突出
頂部７１を通り、内視鏡２の挿入部９の挿入方向に平行
な軸に対して、その軸の近辺で、挿入部９の挿入方向に
対して前方の方向を指すものである。また、先端部２０
の先端形状はこの観察用レンズ２５の第１レンズ２６の
外面側のレンズ面７２と滑らかにつながるような形状に
形成されている。The forward direction of the protruding portion 71 is the insertion of the inserting portion 9 in the vicinity of an axis passing through the protruding portion 71 and parallel to the inserting direction of the inserting portion 9 of the endoscope 2. It refers to the front direction with respect to the direction. Also, the tip 20
The tip shape of is shaped so as to be smoothly connected to the outer lens surface 72 of the first lens 26 of the observing lens 25.
【００４９】そこで、上記構成のものにあっては次の効
果を奏する。すなわち、内視鏡２の挿入部９の先端部２
０に、前方から後方にかけて外径寸法が滑らかに太くな
っていくような突出頂部７１を設けたので、体腔内に内
視鏡２の挿入部９を挿入する際にまず突出頂部７１だけ
が体腔内の小穴に先に入り、そのまま体腔内の小穴を押
し広げるようにして先端部２０を挿入することができ
る。そのため、体腔内の咽頭部や、幽門などのように内
視鏡２の先端部２０の外径寸法とほぼ同じ大きさの小穴
に内視鏡２の挿入部９を挿入する際の内視鏡２の挿入性
を向上させることができる。Therefore, the following effects can be obtained with the above-mentioned structure. That is, the distal end portion 2 of the insertion portion 9 of the endoscope 2
0 is provided with the protruding apex portion 71 whose outer diameter size is smoothly increased from the front side to the rear side. Therefore, when inserting the insertion portion 9 of the endoscope 2 into the body cavity, only the protruding apex portion 71 is firstly inserted into the body cavity. The tip portion 20 can be inserted by first entering the small hole inside and pushing the small hole inside the body cavity as it is. Therefore, the endoscope when inserting the insertion portion 9 of the endoscope 2 into a small hole having substantially the same size as the outer diameter of the distal end portion 20 of the endoscope 2 such as the pharynx in the body cavity or the pylorus. The insertability of 2 can be improved.
【００５０】また、一般に、レンズ内での光軸に対して
斜めに角度のついた先端面をもつレンズを用いると図７
（Ａ）のようにレンズ外での光軸の方向が変わるので、
挿入部９の先端部２０の突出頂部７１の付近を通り、先
端部２０の中心軸と平行な軸側に、先端側のレンズ面７
２より外側での第１レンズ２６のレンズ光軸が傾くよう
に第１レンズ２６のレンズ面７２の角度を設定すること
により、第１レンズ２６の視野方向Ｐが突出頂部７１の
前方方向になる。このように第１レンズ２６の視野方向
Ｐが突出頂部７１の前方方向に向けられることにより、
常に、内視鏡２を操作する者が体腔内における突出頂部
７１の位置が把握しやすくなる。Further, in general, when a lens having a front end surface obliquely angled with respect to the optical axis in the lens is used, FIG.
Since the direction of the optical axis outside the lens changes as in (A),
The lens surface 7 on the distal end side is provided on the axial side parallel to the central axis of the distal end portion 20, passing near the protruding top portion 71 of the distal end portion 20 of the insertion portion 9.
By setting the angle of the lens surface 72 of the first lens 26 so that the lens optical axis of the first lens 26 outside 2 is inclined, the visual field direction P of the first lens 26 becomes the front direction of the protruding top 71. . In this way, the visual field direction P of the first lens 26 is directed in the front direction of the protruding top portion 71,
It is always easier for a person who operates the endoscope 2 to grasp the position of the protruding top portion 71 in the body cavity.
【００５１】さらに、第１レンズ２６の観察視野に突出
頂部７１が入るように視野方向Ｐを設定することによ
り、突出頂部７１の位置はより把握しやすくなる。その
ため、内視鏡２の挿入部９を体腔内に挿入する際に、体
壁などに最初に接触する先端部２０の突出頂部７１の位
置を常に把握することができるので、体壁への突出頂部
７１の接触を予測して回避する事ができる。したがっ
て、内視鏡２の先端部２０と体壁とが予期せぬ接触、あ
るいは必要以上の接触をすることが防止され、安全性が
確保できる。Further, by setting the visual field direction P so that the protruding top portion 71 is included in the observation visual field of the first lens 26, the position of the protruding top portion 71 can be more easily grasped. Therefore, when the insertion portion 9 of the endoscope 2 is inserted into the body cavity, the position of the protruding top portion 71 of the distal end portion 20 that first comes into contact with the body wall or the like can be always grasped, and thus the protrusion to the body wall. The contact of the top portion 71 can be predicted and avoided. Therefore, it is possible to prevent unexpected contact between the distal end portion 20 of the endoscope 2 and the body wall or contact more than necessary, thereby ensuring safety.
【００５２】また、前述した突出頂部７１付近を通り、
先端部２０の中心軸に平行な軸と、第１レンズ２６のレ
ンズ面７２より外側でのレンズ光軸とが近接する付近で
観察用レンズ２５の焦点が合うように第１レンズ２６の
レンズ面７２の角度を設定することにより、突出頂部７
１の前方方向の様子が良く観察でき、内視鏡２の操作者
も突出頂部７１の進行方向をつかみやすい。Further, passing near the above-mentioned protruding top portion 71,
The lens surface of the first lens 26 so that the observation lens 25 is focused near the axis parallel to the central axis of the tip portion 20 and the lens optical axis outside the lens surface 72 of the first lens 26 are close to each other. By setting the angle of 72, the protruding top 7
The state in the front direction of 1 can be observed well, and the operator of the endoscope 2 can easily grasp the traveling direction of the protruding top portion 71.
【００５３】また、図７（Ｂ）は第７の実施の形態の変
形例を示すものである。これは、第７の実施の形態の観
察用レンズ２５の第１レンズ２６として軸対称平面レン
ズを用いたものである。そして、この観察用レンズ２５
の視野内に突出頂部７１の一部が常に入るように設定さ
れている。したがって、この場合も第７の実施の形態と
略同様の効果が得られる。Further, FIG. 7B shows a modification of the seventh embodiment. This uses an axially symmetric plane lens as the first lens 26 of the observation lens 25 of the seventh embodiment. And this observation lens 25
It is set so that a part of the protruding top portion 71 is always in the visual field. Therefore, also in this case, substantially the same effect as that of the seventh embodiment can be obtained.
【００５４】また、図８（Ａ）は本発明の第８の実施の
形態を示すものである。これは、内視鏡２の挿入部９の
先端部２０の先端面に凸状曲面で形成された突出頂部８
１を設けるとともに、その突出頂部８１より後方側に観
察用レンズ２５の第１レンズ２６の外面側のレンズ面８
２を配置したものである。さらに、この第１レンズ２６
は外面側のレンズ面８２が平面である軸対称平面レンズ
によって形成されている。そして、観察用レンズ２５の
中心軸は先端部２０の中心軸に対して傾けた状態で配置
されており、この第１レンズ２６の視野方向は突出頂部
８１と反対方向に傾けられている。Further, FIG. 8A shows an eighth embodiment of the present invention. This is a protruding top portion 8 formed by a convex curved surface on the distal end surface of the distal end portion 20 of the insertion portion 9 of the endoscope 2.
1 is provided, and the lens surface 8 on the outer surface side of the first lens 26 of the observation lens 25 is provided on the rear side of the protruding top portion 81.
2 are arranged. Further, this first lens 26
Is formed by an axisymmetric flat lens whose outer lens surface 82 is a flat surface. The central axis of the observing lens 25 is arranged so as to be inclined with respect to the central axis of the tip portion 20, and the visual field direction of the first lens 26 is inclined in the direction opposite to the protruding top portion 81.
【００５５】そこで、上記構成のものにあっては次の効
果を奏する。すなわち、観察用レンズ２５の第１レンズ
２６の光軸を内視鏡２の挿入方向と同一方向に対して突
出頂部８１と反対側に傾けた状態に配置したことによ
り、観察用レンズ２５の視野範囲全体を突出頂部８１と
は別の方向に向けることができる。そのため、体腔内に
挿入をしやすくするために先端部２０に凸状の突出頂部
８１を設けることにより、観察用レンズ２５の第１レン
ズ２６の外面側のレンズ面８２が突出頂部８１の先端よ
りも後方に配置された場合であっても、観察用レンズ２
５の光軸を内視鏡２の先端部２０の挿入方向と同一方向
に配置した場合のように、観察用レンズ２５の視野範囲
に突出頂部８１が入り、観察用レンズ２５の視野の一部
が突出頂部８１によって遮られ、観察用レンズ２５の視
野範囲を狭くなることを防止することができる。Therefore, the above configuration has the following effects. That is, by arranging the optical axis of the first lens 26 of the observing lens 25 in a state in which the optical axis of the first lens 26 is inclined to the side opposite to the protruding top 81 with respect to the same direction as the insertion direction of the endoscope 2, the field of view of the observing lens 25 The entire area can be oriented in a direction different from the protruding top 81. Therefore, by providing a convex protruding top portion 81 on the distal end portion 20 for facilitating insertion into the body cavity, the lens surface 82 of the observation lens 25 on the outer surface side of the first lens 26 is located closer to the distal end of the protruding top portion 81. The observation lens 2 even when placed behind
As in the case where the optical axis of 5 is arranged in the same direction as the insertion direction of the distal end portion 20 of the endoscope 2, the protruding top portion 81 is included in the visual field range of the observation lens 25, and a part of the visual field of the observation lens 25 is included. Can be prevented from being blocked by the protruding top portion 81 and narrowing the visual field range of the observation lens 25.
【００５６】また、図８（Ｂ）は本発明の第９の実施の
形態を示すものである。これは、内視鏡２の先端部２０
に鉗子チャンネル９１を設けるとともに、観察用レンズ
２５の第１レンズ２６の外面側のレンズ面９２を楔状に
斜めカットして角度をつけた平面によって形成したもの
である。ここで、観察用レンズ２５の第１レンズ２６の
視野方向Ｐは、光の屈折の法則により、内視鏡２の挿入
部９の挿入方向に対し、鉗子チャンネル９１の開口部の
前方方向を見るように、鉗子チャンネル９１側に傾けら
れている。さらに、先端部２０の先端形状は、この観察
用レンズ２５の第１レンズ２６のレンズ面９２と滑らか
につながるような形状に形成されている。FIG. 8B shows the ninth embodiment of the present invention. This is the tip 20 of the endoscope 2.
A forceps channel 91 is provided on the outer surface of the first lens 26 of the observation lens 25, and the lens surface 92 is obliquely cut into a wedge shape to form an angled flat surface. Here, the visual field direction P of the first lens 26 of the observation lens 25 is viewed in the front direction of the opening of the forceps channel 91 with respect to the insertion direction of the insertion portion 9 of the endoscope 2 according to the law of light refraction. As described above, the forceps channel 91 is inclined. Further, the tip shape of the tip portion 20 is formed in such a shape as to be smoothly connected to the lens surface 92 of the first lens 26 of the observation lens 25.
【００５７】そこで、上記構成のものにあっては次の効
果を奏する。すなわち、本実施の形態の様に、観察用レ
ンズ２５の第１レンズ２６の視野方向Ｐを鉗子チャンネ
ル９１の開口部の前方方向に向けることにより、鉗子チ
ャンネル２６から鉗子を前方に突出させた際に、鉗子の
進む向きを常に観察用レンズ２５の視野に捉えることが
できる。そのため、従来のように、鉗子チャンネル９１
より突出された鉗子の進む方向と、観察用レンズ２５の
視野方向Ｐとがほぼ一致している場合のように、鉗子の
先端部が内視鏡２の先端部２０から突出された際の突出
距離や、鉗子の先端部と体壁との間の距離を知ることが
難しい場合に比べて、鉗子の先端部の位置や、鉗子の先
端部と体壁との間の距離等の状態を把握しやすくなる。Therefore, the above configuration has the following effects. That is, when the field of view P of the first lens 26 of the observation lens 25 is directed toward the front of the opening of the forceps channel 91 as in the present embodiment, when the forceps are projected forward from the forceps channel 26. In addition, the direction in which the forceps move can always be caught in the visual field of the observation lens 25. Therefore, as in the conventional case, the forceps channel 91
The projection when the tip of the forceps is projected from the tip 20 of the endoscope 2 as in the case where the direction in which the forceps that is further projected is substantially aligned with the visual field direction P of the observation lens 25. Compared with the case where it is difficult to know the distance or the distance between the tip of the forceps and the body wall, the position of the tip of the forceps and the state of the distance between the tip of the forceps and the body wall can be grasped. Easier to do.
【００５８】さらに、鉗子チャンネル９１の中心軸と内
視鏡２の前方での観察用レンズ２５の光軸とが交わる位
置で観察用レンズ２５のレンズ焦点が合うように観察用
レンズ２５のレンズ角度を設定することにより、更に鉗
子の様子を捉えやすくなるので、対象部位を捕らえやす
い。Further, the lens angle of the observing lens 25 is adjusted so that the lens focus of the observing lens 25 is aligned at the position where the central axis of the forceps channel 91 and the optical axis of the observing lens 25 in front of the endoscope 2 intersect. By setting, it becomes easier to capture the state of the forceps, and it is easier to capture the target site.
【００５９】また、図８（Ｃ）は本発明の第１０の実施
の形態を示すものである。これは、内視鏡２の挿入部９
の先端部２０の先端面に凸状曲面で形成された突出頂部
１０１を設けるとともに、突出頂部１０１以外の曲面部
に鉗子チャンネル１０２の開口部を配置したものであ
る。FIG. 8C shows a tenth embodiment of the present invention. This is the insertion portion 9 of the endoscope 2.
The protruding top portion 101 formed of a convex curved surface is provided on the tip end surface of the tip end portion 20, and the opening portion of the forceps channel 102 is arranged on the curved surface portion other than the protruding top portion 101.
【００６０】さらに、観察用レンズ２５の第１レンズ２
６が内視鏡２の挿入部９の挿入方向とは傾けて配置さ
れ、観察用レンズ２５の第１レンズ２６の外面側のレン
ズ面１０３は平面、あるいは凸状曲面の軸対称なレンズ
で構成されている。そして、この第１レンズ２６の外面
側のレンズ面１０３は、先端部２０の突出頂部１０１以
外の曲面部に配置され、先端部２０の曲面形状と滑らか
につながっている。Further, the first lens 2 of the observation lens 25
6 is inclined with respect to the insertion direction of the insertion part 9 of the endoscope 2, and the lens surface 103 of the observation lens 25 on the outer surface side of the first lens 26 is a plane or a convexly curved axisymmetric lens. Has been done. The lens surface 103 on the outer surface side of the first lens 26 is arranged on a curved surface portion of the tip portion 20 other than the protruding top portion 101, and is smoothly connected to the curved surface shape of the tip portion 20.
【００６１】さらに、観察用レンズ２５の第１レンズ２
６の光軸は、視野方向Ｐを、鉗子チャンネル１０２の前
方方向に向けた状態で傾けられている。この場合、観察
用レンズ２５の外面側のレンズ面１０３と鉗子チャンネ
ル１０２の開口部との間には、突出頂部１０１を挟ま
ず、先端部２０の同じ傾斜面側の曲面に配置されてい
る。Further, the first lens 2 of the observation lens 25
The optical axis 6 is tilted with the visual field direction P facing the front of the forceps channel 102. In this case, the protruding top 101 is not sandwiched between the lens surface 103 on the outer surface side of the observation lens 25 and the opening of the forceps channel 102, and is arranged on the curved surface on the same inclined surface side of the tip 20.
【００６２】そこで、上記構成のものにあっては観察用
レンズ２５の視野方向Ｐを鉗子チャンネル１０２の前方
方向に向けた状態に設定したので、鉗子チャンネル１０
２から鉗子を前方に突出させた際に、鉗子の進む向きを
把握しやすくなる。そのため、観察用レンズ２５の視野
範囲が鉗子の挿入方向を向いているので、鉗子の進む方
向や、鉗子の先端部と体壁との距離をつかみやすく、対
象部位を捕らえやすい。Therefore, in the above-mentioned structure, the field of view P of the observing lens 25 is set to face the front of the forceps channel 102.
When the forceps are projected forward from 2, the direction in which the forceps move can be easily grasped. Therefore, since the field of view of the observing lens 25 faces the insertion direction of the forceps, it is easy to grasp the moving direction of the forceps and the distance between the tip of the forceps and the body wall, and it is easy to catch the target site.
【００６３】さらに、鉗子チャンネル１０２の中心軸と
観察用レンズ２５の光軸とが最も近づくような位置で、
観察用レンズ２５の焦点が合うように設定することによ
り、更に鉗子の動きを把握しやすくなる。Further, at a position where the center axis of the forceps channel 102 and the optical axis of the observation lens 25 are closest to each other,
By setting the observation lens 25 so that it is in focus, it becomes easier to grasp the movement of the forceps.
【００６４】なお、本発明は上記実施の形態に限定され
るものではなく、本発明の要旨を逸脱しない範囲で種々
変形実施できることは勿論である。次に、本出願の他の
特徴的な技術事項を下記の通り付記する。The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention. Next, other characteristic technical matters of the present application will be additionally described as follows.
【００６５】記 （付記項１） 挿入先端部をその挿入方向に向かって少
なくとも一つの凸部を突設して曲面状に形成し、前記挿
入先端部に挿入方向の略前方を視野とする観察用レンズ
を有し、この観察用レンズの中心を前記凸部の突出頂部
以外の部分に配設したことを特徴とする内視鏡。Note (Additional Item 1) Observation in which the insertion tip is formed into a curved surface by projecting at least one protrusion in the insertion direction, and the insertion tip is viewed approximately in the front in the insertion direction. An endoscope having a lens for observation, wherein the center of the observation lens is arranged at a portion other than the protruding top portion of the convex portion.
【００６６】（付記項２） 挿入部先端部を少なくとも
一つ以上の凸部を有す曲面状にし、かつ挿入方向略前方
を視野とする観察用レンズを有し、先端凸状曲面の突出
部以外の部分に観察用レンズ中心を配したことを特徴と
する内視鏡。(Supplementary Note 2) The distal end portion of the insertion portion is formed into a curved surface having at least one convex portion, and the observation lens has a field of view approximately in the front in the insertion direction. An endoscope characterized in that the observation lens center is arranged in a portion other than the above.
【００６７】（付記項３） 突出頂部が挿入部の略中心
に位置している付記項２の内視鏡。 （付記項４） 観察用レンズ先端面を、先端凸状曲面の
一部に近似的に見なせるような面でカットしたことを特
徴とした付記項２の内視鏡。(Additional Item 3) The endoscope according to Additional Item 2, wherein the protruding top portion is located substantially at the center of the insertion portion. (Additional Item 4) The endoscope according to Additional Item 2, wherein the distal end surface of the observation lens is cut with a surface that can be approximately regarded as a part of the convex curved surface of the distal end.
【００６８】（付記項５） 観察用レンズ先端面のカッ
トを平面で行ったことを特徴とする付記項４の内視鏡。 （付記項６） 観察用レンズの先端面が、内視鏡先端部
の先端面と滑らかにつながるような角度で、観察用レン
ズの中心軸を内視鏡中心軸と傾けたことを特徴とした付
記項２の内視鏡。(Additional Item 5) The endoscope according to Additional Item 4, wherein the distal end surface of the observing lens is cut flat. (Additional Item 6) The central axis of the observation lens is inclined with respect to the central axis of the endoscope at an angle such that the distal end surface of the observation lens is smoothly connected to the distal end surface of the endoscope distal end portion. The endoscope according to appendix 2.
【００６９】（付記項７） 先端部に照明用レンズを有
し、観察用レンズ中心軸と照明用レンズ中心軸を含む平
面上において、観察用レンズと照明用レンズとの間で、
内視鏡先端部本体が照明用レンズ先端面より前方に突出
する壁部を有することを特徴とした付記項２の内視鏡。(Additional Item 7) An illumination lens is provided at a tip portion, and on a plane including the observation lens center axis and the illumination lens center axis, between the observation lens and the illumination lens,
The endoscope according to Appendix 2, wherein the endoscope tip portion main body has a wall portion that projects forward from the illumination lens tip end surface.
【００７０】（付記項８） 壁部と照明用レンズ先端面
とが滑らかにつながる付記項７の内視鏡。 （付記項９） 先端凸状曲面の突出頂部近傍に、観察用
レンズ洗浄用流体を噴出するための洗浄用ノズルを配置
したことを特徴とする付記項２の内視鏡。(Additional Item 8) The endoscope according to Additional Item 7, in which the wall portion and the end surface of the illumination lens are smoothly connected. (Additional Item 9) The endoscope according to Additional Item 2, wherein a cleaning nozzle for ejecting an observation lens cleaning fluid is arranged in the vicinity of the protruding top of the convex curved surface.
【００７１】（付記項１０） 突出頂部が挿入部の略中
心に位置している付記項６の内視鏡。 （付記項１１） 挿入部先端部の角部にＲ２〜５の面取
りを施したことを特徴とした内視鏡。(Additional Item 10) The endoscope according to Additional Item 6, wherein the protruding top portion is located substantially at the center of the insertion portion. (Additional Item 11) An endoscope having chamfers of R2 to R5 at the corners of the distal end of the insertion section.
【００７２】（付記項１２） 観察用レンズの先端面の
中で映像として使われていない部分のみを、内視鏡先端
部形状と滑らかにつながるように丸くしたことを特徴と
した内視鏡。(Additional Item 12) An endoscope characterized in that only a portion of the distal end surface of the observation lens which is not used as an image is rounded so as to be smoothly connected to the shape of the endoscope distal end portion.
【００７３】（付記項１３） 観察用レンズの視野方向
が、挿入方向に対し、内視鏡先端部の突出頂部前方方向
を見るように、突出頂部側に傾いている事を特徴とした
付記項２の内視鏡。(Additional Item 13) An additional item characterized in that the visual field direction of the observing lens is inclined toward the protruding top side so that the front direction of the protruding top part of the endoscope distal end portion is seen with respect to the insertion direction. 2 endoscopes.
【００７４】（付記項１４） 観察用レンズの視野方向
が、挿入方向に対し、内視鏡先端部の突出頂部と反対方
向に傾いている事を特徴とした付記項２の内視鏡。 （付記項１５） 観察用レンズと鉗子チャンネルを有
し、観察用レンズの視野方向が、挿入方向に対し、内視
鏡先端部の鉗子チャンネル開口部前方方向を見るよう
に、鉗子チャンネル側に傾いている事を特徴とした内視
鏡。(Additional Item 14) The endoscope according to Additional Item 2, wherein the viewing direction of the observing lens is inclined in the direction opposite to the protruding top of the endoscope distal end with respect to the insertion direction. (Additional Item 15) An observation lens and a forceps channel are provided, and the viewing direction of the observation lens is inclined toward the forceps channel side so that the direction of the front of the forceps channel opening of the endoscope distal end is seen with respect to the insertion direction. An endoscope that is characterized by
【００７５】[0075]
【発明の効果】本発明によれば先端部の外径寸法を格別
に大きくすることなく、丸みの半径が大きい曲面状の凸
部を先端面の周方向全体に亙り均一に形成することがで
き、挿入性に優れた内視鏡を提供することができる。According to the present invention, a curved convex portion having a large radius of roundness can be formed uniformly over the entire circumferential direction of the tip without increasing the outer diameter of the tip. It is possible to provide an endoscope having excellent insertability.
【図１】 本発明の第１の実施の形態におけるビデオ内
視鏡のシステム全体の概略構成図。FIG. 1 is a schematic configuration diagram of an entire system of a video endoscope according to a first embodiment of the present invention.
【図２】 （Ａ）は第１の実施の形態の内視鏡の要部の
概略構成図、（Ｂ）は第１の実施の形態の内視鏡の第１
の変形例を示す要部の概略構成図、（Ｃ）は第１の実施
の形態の内視鏡の第２の変形例を示す要部の概略構成
図。FIG. 2A is a schematic configuration diagram of a main part of the endoscope of the first embodiment, and FIG. 2B is a first configuration of the endoscope of the first embodiment.
Is a schematic configuration diagram of a main part showing a modified example of the above, and (C) is a schematic configuration diagram of a main part showing a second modified example of the endoscope of the first embodiment.
【図３】 （Ａ）は本発明の第２の実施の形態の内視鏡
の要部の概略構成図、（Ｂ）は第２の実施の形態の内視
鏡の変形例を示す要部の概略構成図。FIG. 3A is a schematic configuration diagram of a main part of an endoscope according to a second embodiment of the present invention, and FIG. 3B is a main part showing a modified example of the endoscope according to the second embodiment. FIG.
【図４】 （Ａ）は本発明の第３の実施の形態の内視鏡
の要部の概略構成図、（Ｂ）は本発明の第４の実施の形
態の内視鏡の要部の概略構成図。FIG. 4A is a schematic configuration diagram of a main part of an endoscope according to a third embodiment of the present invention, and FIG. 4B is a schematic view of a main part of an endoscope according to a fourth embodiment of the present invention. Schematic configuration diagram.
【図５】 （Ａ）は本発明の第５の実施の形態の内視鏡
の要部の概略構成図、（Ｂ）は挿入部の先端面の面取り
部分の曲面を大きくすることにより尖り部が形成された
状態を示す要部の概略構成図。5A is a schematic configuration diagram of a main part of an endoscope according to a fifth embodiment of the present invention, and FIG. 5B is a sharpened portion by enlarging a curved surface of a chamfered portion of a distal end surface of an insertion portion. FIG. 3 is a schematic configuration diagram of a main part showing a state in which a ridge is formed.
【図６】 （Ａ）は本発明の第６の実施の形態の内視鏡
の要部の概略構成図、（Ｂ）は第６の実施の形態の内視
鏡の観察用レンズの正面図。FIG. 6A is a schematic configuration diagram of a main part of an endoscope according to a sixth embodiment of the present invention, and FIG. 6B is a front view of an observation lens of the endoscope according to the sixth embodiment. .
【図７】 （Ａ）は本発明の第７の実施の形態の内視鏡
の要部の概略構成図、（Ｂ）は第７の実施の形態の変形
例を示す要部の概略構成図。7A is a schematic configuration diagram of a main part of an endoscope according to a seventh embodiment of the present invention, and FIG. 7B is a schematic configuration diagram of a main part illustrating a modified example of the seventh embodiment. .
【図８】 （Ａ）は本発明の第８の実施の形態の内視鏡
の要部の概略構成図、（Ｂ）は本発明の第９の実施の形
態の内視鏡の要部の概略構成図、（Ｃ）は本発明の第１
０の実施の形態の内視鏡の要部の概略構成図。8A is a schematic configuration diagram of a main part of an endoscope according to an eighth embodiment of the present invention, and FIG. 8B is a schematic view of a main part of an endoscope according to a ninth embodiment of the present invention. Schematic configuration diagram, (C) is the first of the present invention
The schematic block diagram of the principal part of the endoscope of an embodiment of 0.
【図９】 （Ａ）は従来例を示す内視鏡の挿入部の先端
面の正面図、（Ｂ）は（Ａ）の内視鏡の要部の概略構成
図、（Ｃ）は（Ａ）とは異なる従来例を示す内視鏡の挿
入部の先端面の正面図、（Ｄ）は（Ｃ）の内視鏡の要部
の概略構成図。9A is a front view of a distal end surface of an insertion portion of an endoscope showing a conventional example, FIG. 9B is a schematic configuration diagram of a main portion of the endoscope of FIG. 9A, and FIG. 4D] is a front view of the distal end surface of the insertion portion of the endoscope showing a conventional example different from FIG. 4D, and FIG.
２０…先端部、２１…先端面、２２…曲面状凸部、２３
…頂部、２５…観察用レンズ。20 ... Tip part, 21 ... Tip surface, 22 ... Curved convex part, 23
… Top, 25… Lens for observation.
Claims (1)
に向かって曲面状の凸部を突設し、前記挿入部の挿入方
向の略前方を視野とする観察用レンズの中心を前記曲面
状凸部の頂部より偏位させて配設したことを特徴とする
内視鏡。1. A curved convex portion is provided on the distal end surface of the insertion portion in the insertion direction of the insertion portion, and the center of the observing lens having a field of view approximately in the insertion direction of the insertion portion is set to the center of the observation lens. An endoscope characterized in that it is arranged so as to be offset from the top of the curved convex portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31784896A JP3780046B2 (en) | 1995-12-15 | 1996-11-28 | Endoscope |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7-327498 | 1995-12-15 | ||
| JP32749895 | 1995-12-15 | ||
| JP31784896A JP3780046B2 (en) | 1995-12-15 | 1996-11-28 | Endoscope |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09220192A true JPH09220192A (en) | 1997-08-26 |
| JP3780046B2 JP3780046B2 (en) | 2006-05-31 |
Family
ID=26569162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31784896A Expired - Fee Related JP3780046B2 (en) | 1995-12-15 | 1996-11-28 | Endoscope |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3780046B2 (en) |
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| JP2006192200A (en) * | 2005-01-17 | 2006-07-27 | Olympus Medical Systems Corp | Endoscope insertion part and endoscope |
| JP2006325744A (en) * | 2005-05-24 | 2006-12-07 | Olympus Medical Systems Corp | Endoscope |
| WO2010113550A1 (en) * | 2009-03-31 | 2010-10-07 | オリンパスメディカルシステムズ株式会社 | Endoscope |
| JP2012070934A (en) * | 2010-09-28 | 2012-04-12 | Fujifilm Corp | Endoscope apparatus |
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1996
- 1996-11-28 JP JP31784896A patent/JP3780046B2/en not_active Expired - Fee Related
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| JP2012075658A (en) * | 2010-09-30 | 2012-04-19 | Fujifilm Corp | Endoscope apparatus |
| JP2012090741A (en) * | 2010-10-26 | 2012-05-17 | Fujifilm Corp | Endoscope device |
| JP2013063326A (en) * | 2012-12-27 | 2013-04-11 | Fujifilm Corp | Endoscope apparatus |
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| WO2017026653A1 (en) * | 2015-08-11 | 2017-02-16 | 강윤식 | Endoscope |
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| WO2019138639A1 (en) * | 2018-01-09 | 2019-07-18 | オリンパス株式会社 | Layered lens array and endoscope |
| US20200341263A1 (en) * | 2018-01-09 | 2020-10-29 | Olympus Corporation | Laminated lens array, endoscope and image pickup unit |
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