WO2015170701A1 - 電子内視鏡 - Google Patents
電子内視鏡 Download PDFInfo
- Publication number
- WO2015170701A1 WO2015170701A1 PCT/JP2015/063191 JP2015063191W WO2015170701A1 WO 2015170701 A1 WO2015170701 A1 WO 2015170701A1 JP 2015063191 W JP2015063191 W JP 2015063191W WO 2015170701 A1 WO2015170701 A1 WO 2015170701A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- unit
- electronic endoscope
- filter unit
- filter
- cable
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
- A61B1/00002—Operational features of endoscopes
- A61B1/00011—Operational features of endoscopes characterised by signal transmission
- A61B1/00018—Operational features of endoscopes characterised by signal transmission using electrical cables
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
- A61B1/00002—Operational features of endoscopes
- A61B1/00004—Operational features of endoscopes characterised by electronic signal processing
- A61B1/00009—Operational features of endoscopes characterised by electronic signal processing of image signals during a use of endoscope
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
- A61B1/00112—Connection or coupling means
- A61B1/00114—Electrical cables in or with an endoscope
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
- A61B1/00112—Connection or coupling means
- A61B1/00121—Connectors, fasteners and adapters, e.g. on the endoscope handle
- A61B1/00124—Connectors, fasteners and adapters, e.g. on the endoscope handle electrical, e.g. electrical plug-and-socket connection
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
- A61B1/00163—Optical arrangements
- A61B1/00186—Optical arrangements with imaging filters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/06—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation
Definitions
- the present invention relates to an electronic endoscope, and more particularly to an electronic endoscope that transmits an imaging signal obtained by an imaging unit to a processor as a differential signal obtained by converting the imaging signal into digital serial data.
- An endoscope system including an electronic endoscope that captures a subject inside a subject and a processor that generates an observation image of the subject captured by the electronic endoscope is widely used in the medical field, the industrial field, and the like. It is used.
- This electronic endoscope needs to serialize the A / D converted image data and transmit a distance of several meters to a processor having a receiving circuit.
- ISI intersymbol interference
- a buffer with an equalizer is provided in a connector portion closer to the processor.
- it is desirable that the arrangement of the electronic circuits is integrated as much as possible.
- an equalizer As a technique for consolidating electronic circuits, it is conceivable to arrange an equalizer on the processor side having the receiving circuit. However, in order to support electronic endoscopes having insertion portions of various lengths, the respective lengths may be set. It is necessary to provide a plurality of corresponding equalizers, which increases the circuit scale in the processor. Further, since the output waveform of the electronic endoscope is in a state before correction of intersymbol interference, quality control becomes difficult.
- Japanese Patent Application Laid-Open No. 2011-35630 discloses a camera head separation type camera device in which a camera head and a camera control unit are separated.
- the camera head separation type camera device disclosed in Japanese Patent Application Laid-Open No. 2011-35630 includes a voltage measurement unit that measures a voltage drop due to a cable, a table that indicates a relationship between a voltage drop stored in advance and a correction value, and a measurement A correction control unit that extracts a correction value from the table according to the voltage drop, an LVDS control unit that adjusts an LVDS signal waveform based on the correction value, and an LVDS that generates a waveform of the LVDS signal and transmits the waveform to the camera control unit And a conversion driver for reproducing an accurate video signal in the camera control unit.
- the inter-symbol interference can be suppressed by providing the transmission-side camera head with a pre-emphasis function like the camera head separation type camera device disclosed in JP 2011-35630 A, A power supply is required to adjust the amplitude voltage of the signal waveform and to strengthen the rising (falling) portion, and there is a problem that power consumption increases.
- an object of the present invention is to provide an electronic endoscope that can realize a cable loss compensation means that is low in power consumption, low in cost, and easy in quality control.
- An electronic endoscope is an electronic endoscope that transmits an imaging signal obtained by an imaging unit to a processor as a differential signal converted into digital serial data, and the differential signal is transmitted to the processor. And a constant according to the loss of the transmission path including the cable so that the output waveform quality to the processor is constant. And a first filter unit adjusted.
- FIG. 1 is a diagram illustrating a configuration of an endoscope system having an electronic endoscope according to the first embodiment.
- the endoscope system 1 includes an electronic endoscope 2 according to the present embodiment and a processor 3.
- the electronic endoscope 2 includes an elongated insertion portion 10 to be inserted into a subject, an operation portion 11 provided on the proximal end side of the insertion portion 10, and a universal cable provided on the proximal end side of the operation portion 11. 12 and a connector portion 13 provided on the base end side of the universal cable 12.
- the electronic endoscope 2 is configured to be detachable from the processor 3 via a connector unit 13.
- the electronic endoscope 2 includes at least an imaging unit 14, a transmission unit 15, a filter unit 16, and a cable 17.
- the processor 3 includes at least a limiting amplifier (hereinafter referred to as LA) 18 and a receiving circuit 19.
- LA limiting amplifier
- FIG. A cable 17 is connected to the proximal end side of the filter unit 16. The cable 17 is inserted into the insertion unit 10, the operation unit 11, the universal cable 12, and the connector unit 13, and is connected to the LA 18 of the processor 3 when the electronic endoscope 2 is attached to the processor 3. Is done.
- the imaging unit 14 includes, for example, an imaging device such as a CCD and an A / D converter.
- the imaging unit 14 generates an imaging signal obtained by imaging an observation target using the imaging device, and the imaging signal is analogized by the A / D converter.
- the signal is A / D converted from a digital signal and output to the transmitter 15.
- the transmission unit 15 (first transmission unit) converts the image signal captured by the image capture unit 14 and A / D converted into digital serial data, and then outputs the signal to the processor 3 via the filter unit 16 as a differential signal. To do.
- the filter unit 16 is a passive equalizer composed of passive elements that do not require a power source, for example.
- the filter unit 16 is a filter unit that is impedance matched so as to have an impedance equivalent to the impedance of the transmission line including the cable 17.
- the filter unit 16 includes at least one filter 20 (three in the example of FIG. 1) connected in series.
- the number (stages) of these filters 20 is adjusted according to the transmission loss of the transmission path including the cable 17, that is, the transmission loss in the electronic endoscope 2. Therefore, as the length of the cable 17 becomes longer, the number of filters 20 in the filter unit 16 increases. That is, the constant of the filter unit 16 (first filter unit) is adjusted according to the loss of the transmission line including the cable 17 so that the output waveform quality to the processor 3 is constant.
- the number of filters 20 is one.
- the number of filters 20 is two.
- the filter 20 The number of is three.
- the imaging signal output from the filter unit 16 is input to the LA 18 of the processor 3 via the cable 17.
- the LA 18 amplifies the amplitude of the imaging signal input via the cable 17 to a predetermined amplitude and outputs the amplified signal to the receiving circuit 19. That is, the LA 18 amplifies the amplitude reduced by the filter unit 16 that does not require a power source to a necessary amplitude, and outputs the imaging signal amplified to the necessary amplitude to the receiving circuit 19.
- the receiving circuit 19 receives the imaging signal from the LA 18 with the internal clock and then converts it into parallel data.
- the imaging signal converted into parallel data is subjected to predetermined image processing by an image processing circuit (not shown), and then output to a monitor or recording device (not shown) to display or record an image.
- 2A, 2B and 2C are diagrams for explaining the frequency characteristics.
- FIG. 2A shows an example of the frequency characteristic of the cable 17, where the horizontal axis represents frequency and the vertical axis represents gain.
- the cable 17 has the same characteristics as the low-pass filter, passes a component having a frequency lower than a certain frequency, and attenuates a component having a frequency higher than a certain frequency. Therefore, the gain decreases when the frequency exceeds a certain frequency. Moreover, since the high frequency component attenuates more as the length of the cable 17 becomes longer, the gain becomes smaller.
- FIG. 2B shows an example of the frequency characteristic of the filter unit 16, where the horizontal axis represents frequency and the vertical axis represents gain.
- the filter unit 16, which is a passive equalizer, has characteristics similar to those of a high-pass filter or a band-pass filter, attenuates a component having a frequency lower than a certain frequency, and passes a component having a frequency higher than a certain frequency. For this reason, the gain is relatively increased when the frequency exceeds a certain frequency. Further, in the filter unit 16, as the number of stages of the filter 20 increases, the low frequency component is further attenuated, and the gain difference from the high frequency is increased.
- FIG. 2C shows an example of the frequency characteristic of the imaging signal output from the filter unit 16, where the horizontal axis represents frequency and the vertical axis represents gain. Due to the frequency characteristics of the filter unit 16 in FIG. 2B, the gain of the imaging signal output from the filter unit 16 increases as the frequency exceeds a certain frequency as shown in FIG. 2C. The imaging signal output from the filter unit 16 in this way is transmitted to the LA 18 via the cable 17, but the gain is increased when the frequency exceeds a certain frequency due to the same characteristics as the low-pass filter of the cable 17 shown in FIG. 2A. Get smaller. For this reason, a substantially flat imaging signal is input to the processor 3 as indicated by a broken line in FIG. 2C.
- the electronic endoscope 2 does not require a power source and can reduce power consumption because the filter unit 16 is composed of passive elements.
- the electronic endoscope 2 does not require a power source for the filter unit 16, it does not cause heat generation and does not require an additional heat dissipation mechanism, and the electronic endoscope 2 is reduced in diameter and size. Is possible.
- the equalizer is passed.
- the cable 17 has the same characteristics as the low-pass filter
- the filter unit 16 has the same characteristics as the high-pass filter or the band-pass filter. Since both are passive elements and impedances are matched, the entire transfer function is the same even if the order is reversed. Therefore, the electronic endoscope 2 adjusts the characteristics of the filter unit 16 according to the transmission loss of the transmission line including the cable 17, thereby reducing the amplitude at the input end of the processor 3 but suppressing intersymbol interference. A stable waveform can be obtained.
- the electronic endoscope 2 can reduce low-frequency noise before transmission of a signal through the cable 17 due to the characteristics of the filter unit 16, and therefore can suppress electromagnetic radiation.
- the electronic endoscope of the present embodiment it is possible to realize a cable loss compensation means that is low power consumption, low cost, and easy quality control.
- FIG. 3 is a diagram showing a configuration of an endoscope system having an electronic endoscope according to the second embodiment.
- the same components as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
- the electronic endoscope 2 a of the present embodiment is configured by arranging the filter unit 16 in the operation unit 11.
- the filter unit 16 is connected to the transmission unit 15 via the cable 17a, and is connected to the LA 18 via the cable 17b.
- the filter part 16 is connected to the transmission part 15 via the cable 17a, it may be connected to the transmission part 15 via the electric wire or flexible substrate by which impedance management was carried out, for example.
- the number (stages) of the filters 20 of the filter unit 16 is adjusted according to the loss of the transmission path including the cables 17a and 17b. Thereby, the effect similar to 1st Embodiment can be acquired.
- the filter 20 can be easily configured by a plurality of circuits by disposing the filter unit 16 in the operation unit 11 having a larger board area than the insertion unit 10. It becomes.
- the portion surrounded by a broken line is regarded as one unit 21 and the filter unit 16 If the adjustment is performed, quality control at the time of assembly and repair becomes easy.
- FIG. 4 is a diagram showing a configuration of an endoscope system having an electronic endoscope according to the third embodiment.
- the same components as those in FIG. 3 are denoted by the same reference numerals and description thereof is omitted.
- the filter unit 16a, the LA 22 and the filter unit 16b are arranged in the operation unit 11.
- the filter unit 16a is connected to the transmission unit 15 via the cable 17a
- the filter unit 16b is connected to the LA 18 via the cable 17b.
- the filter unit 16a includes a plurality of filters 20a, and the number (stage number) of the filters 20a is adjusted in accordance with the loss of the transmission line including the cable 17a.
- the LA 22 as the second transmission unit amplifies the amplitude of the imaging signal input through the filter unit 16a to a predetermined amplitude and outputs the amplified amplitude to the filter unit 16b.
- the filter part 16b (2nd filter part) is comprised by the some filter 20b, and the number (stage number) of the filter 20b is adjusted according to the loss of the transmission line containing the cable 17b.
- the number of the filters 20a of the filter unit 16a is adjusted according to the loss of the transmission path including the cable 17a.
- the number of filters 20b (the number of stages) is adjusted according to the loss of the transmission line including the cable 17b.
- the filter units 16a, 16b, and LA22 are aggregated and arranged in the operation unit 11 that has a larger board area than the insertion unit 10, whereby the insertion unit 10 can be easily downsized.
- the unit 21a and the unit 21b surrounded by a broken line may be connected via the connector 23. Then, in the unit 21a, the filter unit 16a is adjusted so as to correspond to the loss of the transmission line including the cable 17a, and in the unit 21b, the filter unit 16b is adjusted so as to correspond to the loss of the transmission line including the cable 17b. By doing so, quality control at the time of assembly and repair becomes easy.
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Abstract
Description
まず、図1を用いて第1の実施形態の電子内視鏡を有する内視鏡システムの構成について説明する。図1は、第1の実施形態に係る電子内視鏡を有する内視鏡システムの構成を示す図である。
次に、第2の実施形態について説明する。
次に、第3の実施形態について説明する。
Claims (7)
- 撮像部で得られた撮像信号をデジタルシリアルデータに変換した差動信号としてプロセッサに送信する電子内視鏡であって、
前記差動信号を前記プロセッサに送信するための第1の送信部と、
前記第1の送信部の出力段に配置され、前記プロセッサへの出力波形品質が一定になるように、ケーブルを含む伝送路の損失に応じて定数が調整された第1のフィルタ部と、を有することを特徴とする電子内視鏡。 - 前記第1のフィルタ部は、前記伝送路のインピーダンスと同等のインピーダンスになるようにインピーダンス管理されていることを特徴とする請求項1に記載の電子内視鏡。
- 前記第1のフィルタ部は、直列に接続された少なくとも1つ以上のフィルタにより構成され、前記フィルタの段数によって前記定数の調整を行うことを特徴とする請求項1に記載の電子内視鏡。
- 前記第1の送信部及び前記第1のフィルタ部が挿入部に配置されていることを特徴とする請求項1に記載の電子内視鏡。
- 前記第1の送信部が挿入部に配置され、前記第1のフィルタ部が電線あるいはフレキシブル基板を介して操作部以降に配置されていることを特徴とする請求項1に記載の電子内視鏡。
- 前記第1のフィルタ部からの前記差動信号を前記プロセッサに送信するための第2の送信部と、前記第2の送信部の出力段に配置され、前記第2の送信部以降のケーブルを含む損失に応じて定数が調整された第2のフィルタ部とを更に有し、
前記第1のフィルタ部、前記第2の送信部及び前記第2のフィルタ部が操作部以降に配置されていることを特徴とする請求項1に記載の電子内視鏡。 - 前記第1のフィルタ部、前記第2の送信部、および前記第2のフィルタ部が、前記操作部内に集約して配置されていることを特徴とする請求項6に記載の電子内視鏡。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15790001.0A EP3103379A4 (en) | 2014-05-08 | 2015-05-07 | Electronic endoscope |
JP2015556284A JP5963978B2 (ja) | 2014-05-08 | 2015-05-07 | 電子内視鏡 |
CN201580013027.7A CN106132278B (zh) | 2014-05-08 | 2015-05-07 | 电子内窥镜 |
US15/262,042 US20160374538A1 (en) | 2014-05-08 | 2016-09-12 | Electronic endoscope |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014-097061 | 2014-05-08 | ||
JP2014097061 | 2014-05-08 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/262,042 Continuation US20160374538A1 (en) | 2014-05-08 | 2016-09-12 | Electronic endoscope |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015170701A1 true WO2015170701A1 (ja) | 2015-11-12 |
Family
ID=54392551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/063191 WO2015170701A1 (ja) | 2014-05-08 | 2015-05-07 | 電子内視鏡 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20160374538A1 (ja) |
EP (1) | EP3103379A4 (ja) |
JP (1) | JP5963978B2 (ja) |
CN (1) | CN106132278B (ja) |
WO (1) | WO2015170701A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018094235A (ja) * | 2016-12-15 | 2018-06-21 | オリンパス株式会社 | 内視鏡 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6800109B2 (ja) * | 2017-08-22 | 2020-12-16 | オリンパス株式会社 | 超音波内視鏡 |
CN113573626A (zh) * | 2019-03-18 | 2021-10-29 | 奥林巴斯株式会社 | 内窥镜用光源子*** |
JP2021137150A (ja) * | 2020-03-03 | 2021-09-16 | Hoya株式会社 | 内視鏡システム |
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JP2009106442A (ja) * | 2007-10-29 | 2009-05-21 | Olympus Medical Systems Corp | 撮像システム |
JP2011206337A (ja) * | 2010-03-30 | 2011-10-20 | Fujifilm Corp | 内視鏡システム及びその制御方法 |
JP2012115531A (ja) * | 2010-12-02 | 2012-06-21 | Hoya Corp | 電子内視鏡及び電子内視鏡システム |
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US4860094A (en) * | 1987-03-10 | 1989-08-22 | Olympus Optical Co., Ltd. | Control apparatus for use with different types of endoscopes |
JPH0828839B2 (ja) * | 1987-04-21 | 1996-03-21 | オリンパス光学工業株式会社 | テレビカメラ装置 |
JPH06326916A (ja) * | 1993-05-12 | 1994-11-25 | Olympus Optical Co Ltd | カメラヘッド分離型撮像装置 |
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US6796939B1 (en) * | 1999-08-26 | 2004-09-28 | Olympus Corporation | Electronic endoscope |
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JP4104523B2 (ja) * | 2003-10-02 | 2008-06-18 | オリンパス株式会社 | 映像信号発生装置 |
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-
2015
- 2015-05-07 CN CN201580013027.7A patent/CN106132278B/zh active Active
- 2015-05-07 EP EP15790001.0A patent/EP3103379A4/en not_active Withdrawn
- 2015-05-07 JP JP2015556284A patent/JP5963978B2/ja active Active
- 2015-05-07 WO PCT/JP2015/063191 patent/WO2015170701A1/ja active Application Filing
-
2016
- 2016-09-12 US US15/262,042 patent/US20160374538A1/en not_active Abandoned
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JP2009106442A (ja) * | 2007-10-29 | 2009-05-21 | Olympus Medical Systems Corp | 撮像システム |
JP2011206337A (ja) * | 2010-03-30 | 2011-10-20 | Fujifilm Corp | 内視鏡システム及びその制御方法 |
JP2012115531A (ja) * | 2010-12-02 | 2012-06-21 | Hoya Corp | 電子内視鏡及び電子内視鏡システム |
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JP2018094235A (ja) * | 2016-12-15 | 2018-06-21 | オリンパス株式会社 | 内視鏡 |
Also Published As
Publication number | Publication date |
---|---|
EP3103379A1 (en) | 2016-12-14 |
CN106132278B (zh) | 2017-12-22 |
CN106132278A (zh) | 2016-11-16 |
US20160374538A1 (en) | 2016-12-29 |
JP5963978B2 (ja) | 2016-08-03 |
JPWO2015170701A1 (ja) | 2017-04-20 |
EP3103379A4 (en) | 2017-11-22 |
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