WO2014054743A1 - Unité d'imagerie - Google Patents

Unité d'imagerie Download PDF

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Publication number
WO2014054743A1
WO2014054743A1 PCT/JP2013/076960 JP2013076960W WO2014054743A1 WO 2014054743 A1 WO2014054743 A1 WO 2014054743A1 JP 2013076960 W JP2013076960 W JP 2013076960W WO 2014054743 A1 WO2014054743 A1 WO 2014054743A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
imaging
imaging unit
optical
unit according
Prior art date
Application number
PCT/JP2013/076960
Other languages
English (en)
Japanese (ja)
Inventor
亮 町田
Original Assignee
オリンパスメディカルシステムズ株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by オリンパスメディカルシステムズ株式会社 filed Critical オリンパスメディカルシステムズ株式会社
Publication of WO2014054743A1 publication Critical patent/WO2014054743A1/fr

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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
    • A61B1/00163—Optical arrangements
    • A61B1/00188—Optical arrangements with focusing or zooming features
    • 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
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/00071—Insertion part of the endoscope body
    • A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
    • A61B1/00096—Optical elements
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02B23/2415—Stereoscopic endoscopes
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02B23/2476—Non-optical details, e.g. housings, mountings, supports
    • G02B23/2484—Arrangements in relation to a camera or imaging device
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light

Definitions

  • the present invention relates to an imaging unit in which a member that changes optical performance is inserted into and removed from an imaging optical path by an actuator.
  • JP-A 2007-289278 discloses a video scope having an imaging unit including an objective optical system, a CCD, and a variable aperture unit.
  • the special light filter is retracted during normal light observation and the variable aperture is inserted.
  • the special light filter is inserted during special light observation.
  • a technique is disclosed in which an optimum brightness and observation depth are ensured by retracting the variable aperture and observing the aperture in the open state. The insertion / retraction of the special light dedicated filter and the variable aperture on the photographing optical path is performed by driving control of the filter / variable aperture unit.
  • an actuator such as the filter / variable aperture unit described in JP-A-2007-289278 is disposed in the objective optical system, and drives a plurality of members such as a special light dedicated filter and a variable aperture.
  • the drive mechanism is complicated. Therefore, vignetting may be caused by these structures including the drive mechanism.
  • the reflected light to the structure may cause flare, ghost, and the like.
  • the actuator has a problem that the outer diameter of the imaging unit becomes large if a driving mechanism for driving a plurality of members such as a special light filter and a variable diaphragm and a space for retracting them are secured. It was.
  • An object of the present invention is to provide an imaging unit that prevents the occurrence of vignetting, flare, ghost, and the like.
  • an imaging unit includes an objective optical system, an imaging element that captures an image formed by the objective optical system, and the amount or wavelength band or in-focus position of imaging light.
  • an optical adjustment device having a drive unit that drives the adjustment member to adjust the position so as to be inserted into and removed from the objective optical system.
  • the drive unit includes an electromagnetic coil, and the axis of the electromagnetic coil is a horizontally long effective image. It arrange
  • imaging that prevents the occurrence of vignetting, flare, ghost, and the like in an observation image by an actuator driving mechanism that inserts and removes a member that changes optical performance in an objective optical system without increasing the outer diameter.
  • FIG. 7 is a plan view showing the imaging substrate on the light receiving unit side along the line VIII-VIII in FIG.
  • the figure which shows the display area of the picked-up image which projected and displayed the electromagnetic drive source of the light adjusting device similarly The top view which shows the imaging substrate by the side of the light-receiving part of a modification, and shows the display area of the picked-up image which projected and displayed the electromagnetic drive source of the light adjusting device
  • the endoscope in the following description of the configuration will be described by taking a so-called flexible endoscope having an insertion portion flexible for insertion into the digestive organs of the upper or lower part of the living body, but is not limited thereto.
  • the technique can be applied to a so-called rigid endoscope having a hard insertion portion used for surgery.
  • FIG. 1 is a perspective view showing a configuration of an endoscope apparatus having an endoscope
  • FIG. 2 is a sectional view showing a configuration of an imaging unit
  • FIG. 3 is an exploded perspective view showing a configuration of a light adjusting device
  • FIG. 5 is a plan view of the light adjusting device
  • FIG. 6 is a cross-sectional view of the light adjusting device
  • FIG. 7 is a cross-sectional view for explaining the arrangement of the light adjusting device in the imaging unit
  • FIG. 9 is a plan view showing the imaging substrate on the light receiving unit side along the line -VIII, FIG.
  • FIG. 9 is a diagram showing a display area of a photographed image on which the electromagnetic drive source of the light adjusting device is projected, and FIG. It is a top view which shows the display area of the picked-up image which showed the imaging substrate and projected and displayed the electromagnetic drive source of the light adjusting device.
  • the electronic endoscope system 1 of the present embodiment mainly includes an endoscope 2, a light source device 3, a video processor 4, and a monitor 5.
  • the endoscope 2 includes a long and narrow insertion portion 9, an operation portion 10, and a universal cable 19 that is an electric cable.
  • the insertion portion 9 of the endoscope 2 includes a distal end portion 6, a bending portion 7, and a flexible tube portion 8 in order from the distal end.
  • the operation section 10 is provided with a bending operation knob 14 for bending the bending section 7 of the insertion section 9 and is provided with switches 15 and 16 for various endoscope functions. Yes.
  • a UD bending operation knob 12 for bending the bending portion 7 in the vertical direction and an RL bending operation knob 13 for bending the bending portion 7 in the left-right direction are superimposed. It is arranged.
  • the connecting portion between the insertion portion 9 and the operation portion 10 includes a gripping portion 11 that also serves as a gripping portion by the user, and a bend preventing portion provided between the gripping portion 11 and one end of the flexible tube portion 8 of the insertion portion 9. And a treatment instrument channel insertion portion 18 serving as an opening of a treatment instrument channel through which various treatment instruments arranged in the insertion portion 9 are inserted.
  • the universal cable 19 extended from the operation unit 10 has an endoscope connector 19a that is detachable from the light source device 3 at the extended end.
  • the endoscope 2 according to the present embodiment illuminates from the light source device 3 to the distal end portion 6 by a light guide bundle (not shown) of illumination means disposed in the universal cable 19, the operation unit 10, and the insertion unit 9. It transmits light.
  • the endoscope connector 19a is provided with a coiled coil cable 20 extending, and an electric connector detachably attached to the video processor 4 is provided at an extended end of the coil cable 20.
  • the video processor 4 is electrically connected to a monitor 5 that displays an endoscopic image, and receives an imaging signal photoelectrically converted by an endoscope imaging unit 30 described later, which is an imaging unit described later of the endoscope 2.
  • the signal is processed and output to the monitor 5 as an image signal.
  • the light source device 3 is provided with an air / water supply function for ejecting air and water from the distal end portion 6 of the insertion portion 9 of the endoscope 2.
  • the imaging unit 30 of the present invention will be described below based on the drawings.
  • the imaging unit 30 includes a metal and substantially tubular lens frame 31, a unit holding frame 32 fitted outside the lens frame 31, and an outer side behind the unit holding frame 32. And a reinforcing frame 33 fitted therein.
  • the lens frame 31 is made of a metal such as stainless steel, and constitutes a lens fixing frame that holds the first lens group 41 and the second lens group 42 of the objective optical system. Between the first lens group 41 and the second lens group 42 of the lens frame 31, a light adjusting device 50, which will be described later, provided with a micro actuator is disposed. In addition, the lens frame 31 is fitted by inserting the distal end portion of the unit holding frame 32 to the base end portion.
  • the unit holding frame 32 holds the optical member 43 at the rear part.
  • the front surface of the cover glass 44 is fixed to the rear surface of the optical member 43 with an optical adhesive.
  • a solid-state image pickup element 45 as an image pickup means as an image sensor such as a CCD or CMOS is fixed by an optical adhesive.
  • the solid-state imaging device 45 is electrically connected to the imaging substrate 46.
  • the optical member 43, the cover glass 44, the solid-state imaging device 45, and the imaging substrate 465 held by the unit holding frame 32 are covered with the reinforcing frame 33.
  • the periphery of the solid-state imaging device 45 and the imaging substrate 46 is covered with a filler (not shown) such as an adhesive in the reinforcing frame 33 for moisture prevention, insulation and the like.
  • photographing light (subject image) of the optical axis O that enters the first lens group 41 and the second lens group 42 is imaged by the light receiving unit of the solid-state imaging device 45. It has become so.
  • the solid-state imaging device 45 photoelectrically converts the photographic light and outputs imaging data of the subject to the imaging substrate 46.
  • substrate 46 processes electrically imaging data appropriately, and outputs it to the communication cable (not shown) electrically connected.
  • This communication cable is inserted and arranged in the endoscope 2, and the video processor 4 as an external device shown in FIG. 1 and an electrical connector provided on the coil cable 20 extending from the endoscope connector 19 a are provided. Electrically connected.
  • the light adjustment device 50 as the light adjusting means will be described below based on the drawings.
  • the light adjustment device 50 includes a substrate 51 in which an optical opening 52 is formed, a substrate 53 in which an optical opening 54 is formed, and a plate-like light adjustment in which an optical opening 55 is formed.
  • the substrate 51 and the substrate 53 are plate bodies having disc portions 51a and 53a having substantially the same diameter, and an optical aperture 52 and an optical aperture are formed at the centers of the disc portions 51a and 53a.
  • An optical aperture 54 serving as a stop is provided.
  • the optical aperture 55 of the light adjusting mechanism 56 has a predetermined aperture diameter as an optical diaphragm based on the objective lens.
  • the optical aperture 54 has an aperture diameter smaller than that of the optical aperture 55 of the light adjusting mechanism 56 and the optical aperture 52 of the substrate 51.
  • substrate 53 have the rectangular parts 51b and 53b extended from one outer peripheral part of the disk parts 51a and 53a. These rectangular portions 51b and 53b are opposed to each other when they are overlapped (stacked) together to constitute a retracting portion into which the light adjustment mechanism 56 enters. Further, the rectangular portion 53b of the substrate 53 has a convex portion 52c that forms a gap for allowing the light adjusting mechanism 56 to enter the edge portion by contacting the rectangular portion 51b of the substrate 51 when the rectangular portion 51b overlaps. have. Note that the retreating unit including the rectangular units 51 b and 53 b is disposed in a dead space in the imaging unit 30.
  • Rotating shaft holes 63 and 64 are respectively formed in the substrates 51 and 53 at positions corresponding when the optical aperture 52 and the optical aperture 54 are laminated together.
  • the light adjustment mechanism 56 disposed between the substrates 51 and 53 is provided with a magnetic rotating shaft member 59. Both ends of the rotary shaft member 59 are rotatably inserted into the rotary shaft holes 63 and 64, respectively.
  • a spacer member 65 is disposed between the substrate 51 and the substrate 53 in order to form a gap for allowing the light adjusting mechanism 56 to freely rotate.
  • an optical filter 55 a is provided in the optical aperture 55.
  • the optical filter 55a cuts light of a specific wavelength from normal observation light when performing special observation, for example, fluorescence observation.
  • the light adjusting mechanism 56 is not limited to a mechanism for inserting / removing the optical filter 55a onto / from the photographing optical path, and may be a zoom mechanism in which a zoom lens is disposed in the optical aperture 55. Further, the optical aperture 55 itself is provided. A variable aperture mechanism having an optical variable aperture may be used.
  • the electromagnetic drive source 70 of the light adjusting mechanism 56 includes a U-shaped yoke member 71 (yoke) as a structure and two winding coil portions (electromagnetic coil portions) wound around two arm portions of the yoke member 71. ) 72 and 73, and disposed on the substrate 51 in the outer region of the imaging light beam focused by the first and second lens groups 41 and 42.
  • the winding coil portions 72 and 73 constitute a drive portion, and are wound at both ends of the yoke member 71 so that both end portions 74 and 75 of the yoke member 71 are exposed. Both end portions 74 and 75 of the yoke member 71 are provided at positions facing each other with the rotary shaft member 59 interposed therebetween.
  • the light adjustment device 50 configured as described above is configured such that the light adjustment mechanism 56 rotates the rotation shaft member 59 using the electromagnetic drive source 70, thereby causing the central axis of the rotation shaft member 59 to rotate. Is rotated around the center of rotation. That is, by applying a current to the electromagnetic drive source 70, the rotating shaft member 59 is rotated by the magnetic force generated from the both end portions 74 and 75 of the yoke member 71, and the light adjustment mechanism 56 is superimposed on the optical aperture 52 and the optical aperture 54.
  • the position B can be moved mutually.
  • the optical filter 55a of the light adjusting mechanism 56 is moved to the first stationary position A on the photographing optical path.
  • the fluorescence observation can be performed here, and the optical filter 55a can be switched to the second stationary position B that is removed from the photographing optical path so that the normal light observation can be performed.
  • the endoscope 2 can perform normal observation and fluorescence observation with one objective optical system even if it does not include two objective optical systems (imaging unit 30) for normal observation and fluorescence observation. It has a configuration that can be switched and observed.
  • the imaging unit 30 of the endoscope 2 is configured so that the normal observation and the fluorescence observation without parallax can be performed simultaneously by the two objective optical systems by switching by the light adjustment device 50. Yes.
  • the light adjustment mechanism 56 is a zoom mechanism in which a zoom lens is disposed in the optical aperture 55 as described above, the light adjustment mechanism 56 is switched between the first stationary position A and the second stationary position B. By moving, the zoom or tele state can be switched. Further, as described above, when the light adjustment mechanism 56 is a variable diaphragm mechanism having the optical aperture 55 as an optical variable diaphragm, the light adjustment mechanism 56 is switched between the first stationary position A and the second stationary position B. By doing so, it is possible to change the depth of field by adjusting the amount of light.
  • the light adjustment device 50 is disposed between the first lens group 41 and the second lens group 42.
  • the light adjusting device 50 is arranged so that the second substrate 53 on which an optical aperture 54 serving as an optical diaphragm (brightness diaphragm) is formed is on the first lens group 41 side on the object point side.
  • the electromagnetic drive source 70 of the light adjusting device 50 is arranged so as to be on the second lens group 42 side on the imaging side.
  • the optical aperture 54 of the second substrate 53 functions as an aperture stop, and an optical adjustment mechanism 56 having an optical filter 55a in the vicinity of the aperture stop and an electromagnetic as a minute actuator that drives the optical adjustment mechanism 56.
  • the drive source 70 is arranged.
  • the electromagnetic drive source 70 includes a yoke member 71 and two winding coil portions 72 and 73 as a driving portion for electromagnetically driving the light adjusting mechanism 56, and these yoke member 71 and winding coil portions 72 and 73. Is on the object point side, it is easy to enter or reflect the incident light of the photographing light (optical axis O), which may cause vignetting, flare, ghosting, etc. in the observed image. Therefore, the electromagnetic drive source 70 of the present embodiment is arranged so as to be on the second lens group 42 side on the imaging side.
  • the image area I which is an effective image area to be cut out, has a horizontally long shape in which the image height H1 in the Y direction in the drawing is smaller than the image height H2 in the X direction in the drawing (H1 ⁇ H2). Is an octagon obtained by cutting off a corner of a rectangle having a short length and a long horizontal direction (left and right direction). That is, the image area I has an image height H1 that is the lowest in the vertical direction, and is an effective image area displayed on the monitor 5.
  • the up, down, left, and right directions are image directions displayed on the monitor 5.
  • the winding coil portions 72 and 73 of the electromagnetic drive source 70 are substantially symmetric with respect to the center of the image area I (shooting optical axis O), and the coil axis is substantially parallel to the X direction. It is arranged to become.
  • the cutout shape masked by the image processing is not limited to the octagon in the image region I, and the image region I is imaged on any shape, for example, on the light receiving unit 45a of the solid-state image sensor 45 as shown in FIG. Only the upper and lower sides of the image R in the Y direction may be masked. Also in this case, the winding coil portions 72 and 73 are arranged so that the axes of the respective coils are substantially parallel to the longitudinal direction (X direction) of the image region I.
  • the imaging unit 30 of the present embodiment even if the light adjustment device 50 that drives the optical filter 55a is disposed between the first and second lens groups 41 and 42, the light adjustment is performed.
  • the first and second lens groups 41 and 42 are arranged so that the drive mechanism of the device 50, the electromagnetic drive source 70 as a structure here, does not enter the photographing light flux in the direction of the image height H1 of the image area I. Is arranged so as to be an area outside the imaging light beam that is focused by the lens, so that the occurrence of vignetting, flare, ghost, etc. on the observation image can be prevented.
  • the light adjustment device 50 arranges the retracting portion of the light adjustment mechanism 56 in the dead space in the imaging unit 30.
  • the imaging unit 30 can perform normal observation and fluorescence observation with one objective optical system by switching the optical filter 55a on the imaging optical path by the light adjustment device 50, so simultaneous observation without parallax can be performed. Yes.
  • the imaging unit 30 can be reduced in diameter, the distal end portion 6 of the endoscope 1 can be reduced in size, and the insertion portion 9 can be reduced in diameter.
  • the invention described in the above-described embodiment is not limited to the embodiment and modification examples, and various modifications can be made without departing from the scope of the invention in the implementation stage.
  • the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the described requirements can be deleted if the stated problem can be solved and the stated effect can be obtained.
  • the configuration can be extracted as an invention.

Abstract

La présente invention concerne une unité d'imagerie (30) comprenant : des systèmes optiques d'objectifs (41, 42) ; un élément d'imagerie (45) destiné à enregistrer une image formée par les systèmes optiques d'objectifs (41, 42) ; et un dispositif d'ajustement de lumière (50) comprenant une unité d'entraînement (70) qui entraîne un élément d'ajustement (56) permettant d'ajuster la quantité de lumière, la largeur de bande de longueur d'onde, ou la position de mise au point de la lumière d'imagerie de sorte à ce que ledit élément d'ajustement (56) soit inséré dans et retiré des systèmes optiques d'objectifs. L'unité d'entraînement (70) comprend des bobines électromagnétiques (72, 73), les axes des bobines électromagnétiques (72, 73) étant disposés de sorte à être parallèles au sens de la longueur d'une zone d'image effective (I), et ledit sens de la longueur étant plus long que le sens horizontal de ladite zone.
PCT/JP2013/076960 2012-10-04 2013-10-03 Unité d'imagerie WO2014054743A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-222236 2012-10-04
JP2012222236 2012-10-04

Publications (1)

Publication Number Publication Date
WO2014054743A1 true WO2014054743A1 (fr) 2014-04-10

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04283715A (ja) * 1991-03-12 1992-10-08 Olympus Optical Co Ltd 内視鏡用絞り装置
JP2001337260A (ja) * 2000-05-25 2001-12-07 Canon Inc 撮像装置
JP2006030602A (ja) * 2004-07-16 2006-02-02 Konica Minolta Opto Inc 光学ユニット
JP2007289278A (ja) * 2006-04-21 2007-11-08 Olympus Medical Systems Corp 内視鏡システム
JP2010109502A (ja) * 2008-10-28 2010-05-13 Canon Electronics Inc 撮像ユニット、撮像ユニットの組立方法及び撮像装置
JP2010191282A (ja) * 2009-02-19 2010-09-02 Canon Electronics Inc 撮像装置
JP2011194040A (ja) * 2010-03-19 2011-10-06 Olympus Medical Systems Corp 医療機器
JP2012014092A (ja) * 2010-07-05 2012-01-19 Olympus Corp 光調節装置
JP2012123037A (ja) * 2010-12-06 2012-06-28 Olympus Corp 光調節装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04283715A (ja) * 1991-03-12 1992-10-08 Olympus Optical Co Ltd 内視鏡用絞り装置
JP2001337260A (ja) * 2000-05-25 2001-12-07 Canon Inc 撮像装置
JP2006030602A (ja) * 2004-07-16 2006-02-02 Konica Minolta Opto Inc 光学ユニット
JP2007289278A (ja) * 2006-04-21 2007-11-08 Olympus Medical Systems Corp 内視鏡システム
JP2010109502A (ja) * 2008-10-28 2010-05-13 Canon Electronics Inc 撮像ユニット、撮像ユニットの組立方法及び撮像装置
JP2010191282A (ja) * 2009-02-19 2010-09-02 Canon Electronics Inc 撮像装置
JP2011194040A (ja) * 2010-03-19 2011-10-06 Olympus Medical Systems Corp 医療機器
JP2012014092A (ja) * 2010-07-05 2012-01-19 Olympus Corp 光調節装置
JP2012123037A (ja) * 2010-12-06 2012-06-28 Olympus Corp 光調節装置

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