JP6602979B2 - 内視鏡装置 - Google Patents
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- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
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- A61B1/00002—Operational features of endoscopes
- A61B1/00004—Operational features of endoscopes characterised by electronic signal processing
- A61B1/00006—Operational features of endoscopes characterised by electronic signal processing of control signals
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- A—HUMAN NECESSITIES
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- A61B1/00064—Constructional details of the endoscope body
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- A61B1/00147—Holding or positioning arrangements
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- A—HUMAN NECESSITIES
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
- A61B1/05—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances characterised by the image sensor, e.g. camera, being in the distal end portion
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- A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
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- A61B1/12—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with cooling or rinsing arrangements
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- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
- G02B23/2423—Optical details of the distal end
- G02B23/243—Objectives for endoscopes
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Description
図1は、本実施の形態に係わる内視鏡装置の構成を示す構成図である。図1に示すように、本実施の形態の内視鏡装置1は、内視鏡2と、この内視鏡2が接続されるビデオプロセッサ3とを有して構成されている。モニタ4がビデオプロセッサ3に接続されている。
さらに先端部21には照明窓(図示せず)も設けられている。照明窓は、照明光を出射する。
操作部12には、レリーズボタンなどの各種操作器と共に、後述するズームレンズを駆動するためのズーム操作器25も設けられている。
なお、照明光は、先端部21内に内蔵されたLED(発光ダイオード)などの発光素子の光でもよい。
図2は、内視鏡装置1の構成を示すブロック図である。
以上のように、内視鏡2は、後述する発熱判定部44,45がアクチュエータ及び位置検出部が発熱状態にあると判定するための判定情報を格納するメモリ39を有している。
ビデオプロセッサ3は、制御部40と、ボイスコイルモータ(VCM)ドライバ41と、駆動制御部42と、位置検出回路43とを有する。
電源43aは、差動増幅器38へ電源電圧となる入力電圧VCを、信号線を介して供給すると共に、入力電圧VCを供給する信号線に流れる電流の電流値を示す電流信号IDを位置検出部用の発熱判定部45へ供給する回路である。
定電流回路43cは、ホール素子37へ入力電流ICを信号線を介して供給すると共に、ホール素子37に印加される電圧の電圧値を示す電圧信号VDを位置検出部用の発熱判定部45へ供給する回路である。
故障処理部46は、2つの判定結果情報J1,J2に基づいて、必要な停止処理のための停止信号SS1,SS2を生成し、それぞれボイスコイルモータドライバ41と位置検出回路43に出力する。
ボイスコイルモータドライバ41は、Hブリッジ回路51と、電流検出部52を含む。Hブリッジ回路51は、Pチャンネル型MOSFETとNチャンネル型MOSFETが直列接続された直列回路が2つ並列に接続されて構成され、電源電圧VCCが印加される。一方のPチャンネル型MOSFETとNチャンネル型MOSFETの接続点と、他方のPチャンネル型MOSFETとNチャンネル型MOSFETの接続点との間にボイスコイルモータ32が電気的に接続される。各MOSFETのゲートに駆動制御部42からの駆動指示信号DSが供給される。
位置検出回路43の電源43aは、差動増幅器38へ入力電圧VCを供給すると共に、電流検出回路61を含む。位置検出回路43の定電流回路43cは、定電流源62と、電圧検出回路63を含む。
(発熱の判定)
図5は、アクチュエータ用の発熱判定部44の判定処理の流れの例を示すフローチャートである。図5に示す発熱判定部44の判定処理は、制御部40のCPUによって実行される。
発熱判定部44は、Hブリッジ回路51に流れる電流SIの電流値が所定の閾値TH1以上であるかを判定する(S2)。閾値TH1は、メモリ39から読み出された判定情報であり、以下に説明する各種所定の閾値及び各種所定時間も、メモリ39から読み出された判定情報である。
電流SIの電流値が所定の閾値TH1以上でなければ(S2:NO)、処理は、S1に戻る。なお、S2でNOのとき、タイマが既にオンであるときは、タイマはクリアされる。
タイムアップしていなければ(S4:NO)、処理は、S2へ戻る。従って、電流SIの電流値が所定の閾値TH1以上である状態が所定時間T1継続するまでは、S4の判定はNOとなる。
図6は、位置検出部用の発熱判定部45の判定処理の流れの例を示すフローチャートである。図6に示す発熱判定部45の判定処理も、制御部40のCPUによって実行される。
タイマをオンにした後、発熱判定部45は、タイムアップしたかを判定する(S14)。
故障処理部46は、判定結果情報J1とJ2に基づいて、ボイスコイルモータ32が発熱状態にあり、位置検出回路43は発熱状態にないと判定されたときは、ボイスコイルモータドライバ41の作動を停止させる停止信号SS1をボイスコイルモータドライバ41へ出力する。なお、停止信号SS1は、図2において一点鎖線で示すように、駆動制御部42へ出力するようにしてもよい。
その結果、ボイスコイルモータ32への駆動電流DIは、出力されなくなる。
故障処理部46は、判定結果情報J1とJ2に基づいて、ボイスコイルモータ32は発熱状態になく、位置検出部33が発熱状態にあると判定されたときは、ボイスコイルモータドライバ41の作動を停止させる停止信号SS1をボイスコイルモータドライバ41へ出力し、位置検出部33の作動を停止させる停止信号SS2も位置検出回路43へ出力する。
故障処理部46が、判定結果情報J1とJ2に基づいて、ボイスコイルモータ32及び位置検出部33の両方が発熱状態にあると判定したときは、ボイスコイルモータドライバ41の作動を停止させる停止信号SS1をボイスコイルモータドライバ41へ出力し、位置検出部33の作動を停止させる停止信号SS2も位置検出回路43へ出力する。
以上のように、上述した実施の形態によれば、位置検出部の発熱による位置検出部の特性の劣化などを抑制することができる内視鏡装置を提供することができる。
上述した実施の形態では、アクチュエータの発熱状態の有無は、アクチュエータすなわちボイスコイルモータ32に供給される電流の値の大きさによって判定されるが、アクチュエータの負荷抵抗値の大きさによって判定するようにしてもよい。
上述した実施の形態では、アクチュエータの発熱状態の有無は、アクチュエータすなわちボイスコイルモータ32に供給される電流の値の大きさによって判定されるが、駆動制御部42において、制御目標値と検出値の差が所定の閾値以上である状態が所定時間以上継続した場合は、ボイスコイルモータ32が発熱状態であると判定するようにしてもよい。
発熱判定部44が、制御目標値と検出値の差が所定の閾値THD以上である状態が所定時間T4以上継続した場合は、ボイスコイルモータ32が発熱状態であると判定する。
上述した実施の形態では、発熱判定部44及び46は、ボイスコイルモータ32への供給電流及び位置検出部33への供給電流及び電源電圧に基づいて、アクチュエータの発熱及び位置検出部の発熱を判定しているが、温度センサによりアクチュエータの発熱及び位置検出部の発熱を判定するようにしてもよい。
発熱判定部44は、温度センサ71の出力信号に基づいて、ボイスコイルモータ32の温度を算出し、算出した温度が所定の閾値TH4以上である状態が所定時間T5以上継続したとき、ボイスコイルモータ32が発熱状態にあると判定する。
さらに、同様に、図2において、点線で示すように、位置検出部33の近傍に温度センサ72を配置する。
よって、本変形例3によっても、アクチュエータあるいは位置検出部の発熱の判定を行うことができる。
上述した実施の形態では、制御部40の2つの発熱判定部44,45と故障処理部46は、ビデオプロセッサ3内に設けられているが、コネクタ13a内に設けるようにしてもよい。
Claims (13)
- レンズ駆動機構を有する観察光学系を有する内視鏡と、前記内視鏡が接続されるプロセッサとからなる内視鏡装置であって、
前記内視鏡に設けられ、前記レンズ駆動機構に係わるレンズを駆動するアクチュエータと、
前記内視鏡に設けられ、前記レンズの位置を検出する位置検出部と、
前記位置検出部が発熱状態にあることを判定する第1の発熱判定部と、
前記第1の発熱判定部が、前記位置検出部が発熱状態にあると判定した場合は、前記位置検出部の作動を停止させる作動停止部と、
を有し、
前記第1の発熱判定部は、前記位置検出部への入力電流又は入力電圧を監視し、前記入力電流又は前記入力電圧の値が、第1の閾値以上で、かつ前記第1の閾値以上の状態が第1の時間継続した場合に、前記位置検出部が発熱状態にあると判定することを特徴とする内視鏡装置。 - 前記第1の発熱判定部が、前記位置検出部が発熱状態にあると判定した場合は、前記作動停止部は、前記位置検出部の作動を停止すると共に、前記アクチュエータの作動を停止することを特徴とする請求項1に記載の内視鏡装置。
- 前記第1の発熱判定部は、前記位置検出部に設けられた第1の温度センサの出力信号に基づいて、前記アクチュエータが発熱状態にあると判定することを特徴とする請求項1又は2に記載の内視鏡装置。
- 前記アクチュエータが発熱状態にあることを判定する第2の発熱判定部を有し、
前記第2の発熱判定部が、前記アクチュエータが発熱状態にあると判定した場合は、前記作動停止部は、前記アクチュエータの作動を停止することを特徴とする請求項1から3のいずれか1つに記載の内視鏡装置。 - 前記アクチュエータが発熱状態にあることを判定する第2の発熱判定部を有し、
前記第2の発熱判定部が、前記アクチュエータが発熱状態にあると判定した場合は、前記作動停止部は、前記アクチュエータの作動を停止すると共に、前記位置検出部の作動を停止することを特徴とする請求項4に記載の内視鏡装置。 - 前記第1の発熱判定部が、前記位置検出部が発熱状態にあると判定し、かつ、前記第2の発熱判定部が、前記アクチュエータが発熱状態にあると判定しない場合は、前記作動停止部は、前記アクチュエータを駆動させて前記レンズ駆動機構のレンズ位置を内視鏡画像のより広い視野が確保できる側にすることを特徴とする請求項4又は5に記載の内視鏡装置。
- 前記第2の発熱判定部は、前記アクチュエータに供給される供給電流を監視し、前記供給電流の値が、第2の閾値以上で、かつ前記第2の閾値以上の状態が第2の時間継続した場合に、前記アクチュエータが発熱状態にあると判定することを特徴とする請求項4から6のいずれか1つに記載の内視鏡装置。
- 前記第2の発熱判定部は、前記アクチュエータに供給される供給電流と前記アクチュエータに印加する印加電圧から算出した抵抗値が、第3の閾値以上で、かつ前記第3の閾値以上の状態が第3の時間継続した場合に、前記アクチュエータが発熱状態にあると判定することを特徴とする請求項7に記載の内視鏡装置。
- 前記位置検出部により検出された前記レンズの位置に基づき、前記アクチュエータをフィードバック制御により駆動する駆動制御部を有し、
前記第2の発熱判定部は、前記位置検出部により検出された前記レンズの位置と、前記レンズの位置の制御指示値との差が第4の閾値以上で、かつ前記第4の閾値以上の状態が第4の時間継続した場合に、前記アクチュエータが発熱状態にあると判定することを特徴とする請求項4から6のいずれか1つに記載の内視鏡装置。 - 前記第2の発熱判定部は、前記アクチュエータに設けられた第2の温度センサの出力信号に基づいて、前記アクチュエータが発熱状態にあると判定することを特徴とする請求項4から6のいずれか1つに記載の内視鏡装置。
- 前記内視鏡は、前記第1の発熱判定部が前記位置検出部が発熱状態にあると判定するための判定情報を格納するメモリを有し、
前記第1の発熱判定部は、前記メモリから読み出された前記判定情報を用いて、前記位置検出部が発熱状態にあることの判定を行うことを特徴とする請求項1から10のいずれか1つに記載の内視鏡装置。 - 前記アクチュエータは、1又は複数の磁石及び1又は複数のコイルを有し、可動部を固定部に対して相対移動させることが可能なボイスコイルモータであることを特徴とする請求項1から11のいずれか1つに記載の内視鏡装置。
- 前記位置検出部は、前記レンズの移動に伴う磁界の変化を検出するホール素子又は磁気抵抗素子を有し、
前記ホール素子又は前記磁気抵抗素子は、定電流回路からの定電流の供給を受けることを特徴とする請求項1から12のいずれか1つに記載の内視鏡装置。
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