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WO2009090664A1 - Dispositif de réglage de l'éclairage dans un système d'imagerie endoscopique - Google Patents

Dispositif de réglage de l'éclairage dans un système d'imagerie endoscopique Download PDF

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Publication number
WO2009090664A1
WO2009090664A1 PCT/IN2008/000488 IN2008000488W WO2009090664A1 WO 2009090664 A1 WO2009090664 A1 WO 2009090664A1 IN 2008000488 W IN2008000488 W IN 2008000488W WO 2009090664 A1 WO2009090664 A1 WO 2009090664A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
grating
aperture
light source
control
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.)
Ceased
Application number
PCT/IN2008/000488
Other languages
English (en)
Inventor
Debasish Pradhan
Ganesh Manohar Chavan
Hitesh Jain
Satyajeet Vijay Parakh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kenvue UK Ltd
Original Assignee
Johnson and Johnson Ltd
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 Johnson and Johnson Ltd filed Critical Johnson and Johnson Ltd
Priority to BRPI0822009-3A priority Critical patent/BRPI0822009A2/pt
Priority to CN2008800205964A priority patent/CN101801258B/zh
Publication of WO2009090664A1 publication Critical patent/WO2009090664A1/fr
Priority to ZA2010/00570A priority patent/ZA201000570B/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • 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
    • A61B1/06—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
    • A61B1/0646—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 with illumination 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
    • A61B1/06—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
    • A61B1/0655—Control therefor
    • 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
    • A61B1/06—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
    • A61B1/0661—Endoscope light sources
    • A61B1/0669—Endoscope light sources at proximal end of an endoscope
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/3594—Characterised by additional functional means, e.g. means for variably attenuating or branching or means for switching differently polarized beams
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/34—Optical coupling means utilising prism or grating

Definitions

  • the present invention relates generally to an illumination control system, and more particularly to an illumination control device for an endoscopic light source.
  • MIP or MIS Minimally invasive procedures or surgeries
  • endoscopic, laparoscopic, endoscopically-assisted, or laparoscopically-assisted procedures are known and offer benefits to a patient such as lmited incisional trauma, decreased pain, limited scars, decreased hospitalization, and earlier return to a normal functional state.
  • an external light source coupled to an optic fiber and endoscope is used to illuminate the operative space.
  • a control over the illumination intensity is desired to improve and adjust the visualization of the site as per the needs of the surgeon, operator and/or the practitioner.
  • One such control device establishes the use of a circular disc with varying aperture/opening.
  • the aperture is located between the light source and the entrance plane of the fiber optic cable. Rotation of the disc varies the aperture, thereby controlling the illumination zone at the entrance plane of the fiber optic cable.
  • Another device employs a rotating disc with two concentrically placed bands, wherein the first band comprises an open portion and second band comprising slots whose width and spacing successively change such that with rotation of the disc, the light transmitted by the second band gradually increases, being additive to the light transmitted by the open portion of the first band.
  • Other devices provide multiple discs arrangements for controlling the illumination intensity.
  • the control device should be simple in design and should provide finer control of illumination intensity. Further, the device should be easier to operate and should not cause uneven distribution of illumination intensity.
  • Another object of the invention is to propose an illumination control device in an endoscopic imaging system, which eliminates the problem of uneven distribution of illumination intensity by the device.
  • a further object of the invention is to propose an illumination control device in an endoscopic imaging system, which is capable of providing finer control on the illumination intensity.
  • a still further object of the invention is to propose an illumination control device in an endoscopic imaging system, which is simple, easy to operate and cost- effective.
  • an illumination control device in an endoscopic imaging system comprising a light source subassembly having at least one light source and a reflector, the reflector transforming the light originated from the light source into a focused beam of light; a power supply module to provide power to the light source including several other modules of the system; the illumination control device disposed between the light source and an optic port, and controls the intensity of the focused beam of light and allows the controlled beam of light to pass though the optic port; a fibre optical cable transmitting the light beam from the optic port to an endoscope and illuminates the examination site; a camera unit receiving the light reflected from the site via the endoscope and converting the reflected light to video/image signals; and an electronic subassembly for modulating and processing the video signals received via a camera connector and allows display of the video via a display unit, the device comprising; a control member coupled to a mounting block via a second coupling which connects a motion transmission means to the control member, the motion transmission means connecting the mounting block by
  • FIG. 1 illustrates a functional block diagram of an imaging system wherein the embodiments of the present invention can be practiced
  • FIG. 2 illustrates an exploded view of the illumination control device, in accordance with an embodiment of the present invention
  • FIG. 3 illustrates the engagement of a limiting member and a driving means of the illumination control device, in accordance with an embodiment of the present invention
  • FIG. 4 illustrates the control member of the illumination control device, in accordance with an embodiment of the present invention.
  • FIG. 5 illustrates the control curve of the illumination control device, in accordance with an embodiment of the present invention.
  • fiber optics and “fiber optic cable” as used herein are intended to typically refer to flexible optical conductors comprising a multiplicity of light conductive fibers, e.g. glass fibers, in the form of a bundle or strand; generally, the bundle includes an adhesive, matrix or the like for interconnection of the fibers, and a sheath, sleeve or the like is arranged around the fiber bundle; the bundle ends are arranged in planes, generally by grinding vertically to the axes of the fibers; when used for illumination of a cavity, one of the planes is arranged near a light source and referred to as "entrance plane” while the other plane is placed near the site that is to be illuminated and is referred to as the "exit plane.”
  • the bundle includes an adhesive, matrix or the like for interconnection of the fibers, and a sheath, sleeve or the like is arranged around the fiber bundle; the bundle ends are arranged in planes, generally by grinding vertically to the axes of the fibers; when used
  • the term "light source” as used herein refers to light source producing light or a light beam.
  • the light source can be a cold light source, wherein, the light or the light beam contains only a negligible amount of heat radiation, that is, only very little radiation in the infrared range of the spectrum, if any.
  • the light sources may also be chosen from other kinds of light sources.
  • Various light sources are known to those skilled in the art, such as a halogen light source, xenon light source, metal halide bulb, LED, tungsten filament bulb, arc light source and the like.
  • the light source may sometimes include an integrated reflector for providing a focused beam of light.
  • the imaging system 100 typically includes a light source subassembly 110, a cooling module 120, a power supply module 130, an electronic subassembly 140, a camera unit 150, an optic port 160, a fiber optic cable 170, a camera connector 180, an endoscope 190, and an illumination control device 200.
  • the light source subassembly 110 includes a light source 112, a reflector 114, a light source mounting 116, and a heat sink 118.
  • the light source 112 and the reflector 114 are attached to the light source mounting 116.
  • the heat sink 118 is coupled to the light source mounting 116.
  • the heat sink 118 is provided to enhance the cooling effect of the cooling module 120.
  • the light source is powered by the power supply 130.
  • the power supply module 130 may also supply electrical power to other modules of the system 100 such as the cooling module 130, camera unit 150, and the electronic subassembly 140.
  • the imaging system 100 functionally comprises two essential flows, the first being the flow of light for illuminating from the light source (112) to the site to be examined/manipulated/operated. The second being the flow of the video signals/images from the examination site to the display. The following paragraphs explain these flows and associated system modules.
  • the light originating from the light source 112 is transformed into a focused beam of light by the reflector 114.
  • the focused beam of light passes through the illumination control device 200, which is located between the light sourcell2 and the optic port 160.
  • the illumination control device 200 controls the intensity of light beam that passes through the optic port 160.
  • the illumination control device 200 is the focus of the present invention, and is described in details in conjunction with Figure2.
  • the light beam is thereafter, transmitted through the fiber optic cable 170 to the endoscope 190.
  • the light beam passes through the endoscope 190, and illuminates the site to be examined/manipulated/operated.
  • the reflected light passes through the objective lens of the endoscope 190 and is transmitted to the camera unit 150.
  • the camera unit 150 converts the reflected light to video/image signal.
  • the video signals are passed to the electronic subassembly 140 through the camera connector 180.
  • the video signals are modulated and processed by the electronic subassembly 140.
  • the electronic subassembly 140 also includes output ports where a video display can be connected to view the video images from the examination site.
  • the illumination control device 200 includes a control member 210, a mounting block 220, a motion transmission means 230, a driving means 240, an elongated limiting member 250, and at least two coupling members 260 and 270.
  • the second coupling member 270 couples the control member 210 to the mounting block 220.
  • the second coupling member 270 also connects the motion transmission means 230 to the control member 210.
  • the motion transmission means 230 is further, coupled to the mounting block 220 by the first coupling member 260.
  • the first coupling member 260 also connects the driving means 240 to the motion transmission means 230.
  • the first and second coupling members 260 and 270 are moveably or rotatbly coupled to the mounting block 220 and the other components are attached to the first and second coupling members 260 and 270 using screws, keyway-pin arrangement, hole-pin arrangements, glue, and the like.
  • the movement of the driving means 240 governs the movement of the control member 210.
  • the elongated limiting member 250 is provided to limit the movement of the driving means 240. As shown in the figure 2, the elongated limiting member 250 is attached to the mounting block 220. Further, the elongated limiting member (250) engages with one or more planar members (not shown in Figure 2) to limit the movement of the driving means 240, as explained in conjunction with FIG. 3.
  • the control member 210 is in form of a circular disc.
  • the disc is centrally attached to the second coupling member 270 by means of screw.
  • other means of attaching the control member 210 to the second coupling member 270 can be used, such as welding, glue, rivet, nut and bolt arrangement, keyway-pin arrangement, hole-pin arrangement, non-circular shaft and hub, spline shaft and hub arrangement, and the like.
  • the second coupling member 270 is in form of a shaft rotatably coupled to the mounting block 220 by means of bearings, bushings, clips and the like.
  • the second coupling member 270 is also coupled to the motion transmission means 230.
  • the motion transmission means 230 is a belt drive, as illustrated in Fig. 2.
  • the belt drive includes a set of toothed gears and a driving belt connecting the gears.
  • One of the toothed gears is attached to the second coupling member 270.
  • the other toothed gear is attached to the first coupling member 260.
  • the embodiment of the present invention illustrates the use of a belt drive for motion transmission, however, numerous other motion transmission mechanism and their variations may occur to those skilled in the art, such as, rack and pinion arrangement, a gear drive, a belt-pulley arrangement, frictional drives, pneumatic transmission system, hydraulic transmission system magnetic transmission systems and the like.
  • the first coupling member 260 is a shaft rotatably coupled to the mounting block 220 by means of a bearing, bushing, clips and the like.
  • the motion transmission means 230 is also attached to the first coupling member 260.
  • the driving means 240 is also attached to the first coupling member 260.
  • the driving means 240 is a manually actuated knob, wherein the knob is fixed to the coupling member by means of screws, nut and bolt arrangement, welding, gluing, riveting, keyway-pin arrangement, hole-pin arrangement, non-circular shaft and hub, spline shaft and hub arrangement, and the like.
  • the driving means 240 is an electric stepper motor combined with a switch to control the motion.
  • Various other embodiments of the driving means 240 are known to those skilled in the art, for example, pneumatic, hydraulic, magnetic, and the like.
  • Figure 3a and 3b illustrate the engagement of the elongated limiting member 250 with planar members 302 and 304, respectively.
  • the planar members 302 and 304 are attached to the driving means 240, therefore, the engagement of the elongated limiting member 250 with the planar members 302 and 304, limits the movement of the driving means 240. Limiting the movement of the driving means 240 limits the movement of the control member 210. Thus, setting up the range of control of the illumination intensity.
  • the planar members 302 and 304 are placed at 180 degrees with each other. The said placement of the planar members 302 and 304 causes the movement of the driving means 240 to get limited by 180 degrees.
  • control member 210 the range of movement of the control member 210 is limited.
  • the range of movement of the control member 210 and the components of the control member 210 defines the control a user/operator would have over the illumination intensity.
  • the components of the control member 210 are described in detail, in conjunction with Figure 4.
  • the control member 210 includes a carrying/bearing member 402, an aperture 404, a grating 406, a centre bore 408, at least two holes 410 and 412.
  • the carrying/bearing member 402 is shaped like a circular disc.
  • the carrying/bearing member 402 can be made of composites, metal, alloy, heat resistant plastic, glass, ceramic, and the like.
  • the aperture 404 is a variable slit/opening in the carrying/bearing member 402, the slit/opening substantially symmetrical about a guiding curve 414.
  • the aperture 404 is placed between the optic port 160 and light source 112.
  • the aperture 404 moves across the optic port 160.
  • the aperture 404 controls the area of the optic port 160 receiving the light from the light source 112.
  • the movement of the aperture 404 affects illumination intensity at the site of examination.
  • the center of the optic port 160 follows the guide curve 414 as the control member 210 is moved.
  • the aperture 404 is equally distributed about the guiding curve 414. This results in a substantially symmetrical distribution of light across the optic port 160.
  • the aperture 404 is in form of a sickle.
  • the sickle shape provides a substantially symmetrical distribution of the light intensity across at the optic port 160.
  • the width of the aperture 404 increases until a first point 416, and thereafter becomes constant.
  • the width at the first point 416 can be greater than, or equal to the diameter of the optic port 160.
  • the width of the aperture 404 is equal to the diameter of optic port 160 at a second point 418.
  • the second point 418 comes before the first point 416 moving clockwise along the guiding curve 414.
  • the first point 416 and second point 418 may coincide. Since, the limiting dimension is the diameter of the optic port 160, the illumination intensity is independent on the aperture 404 as the width of aperture increase beyond the width at the second point 418.
  • the aperture 404 can have different shapes within the scope of the invention.
  • different shapes of the aperture 404 may be desired corresponding to various embodiments of the control member 210.
  • the aperture 404 can be an isosceles triangle.
  • the control member 210 also includes grating 406, which occupies the aperture 404.
  • the opacity of the grating 406 varies along the guiding curve 414.
  • the grating 406 is a metal plate with circular holes. The pattern of the holes is varied across the guiding curve 414 to vary the opacity of the grating 406.
  • the opacity of the grating 406 is varied by varying the spacing between the holes, varying the size of the hole, changing the shape of the hole, or a combination thereof. The variation in the opacity of the grating 406 is substantially gradual.
  • the opacity of the grating 406 may be desired to change in an stepwise manner, or a combination of stepwise and gradual change, and the like.
  • the circular holes in the grating 406 as illustrated in Fig. 4 may be replaced by different shapes such as oval, square, rectangular, slit-shape, triangle, star, cross, and the like.
  • the Fig. 4 illustrates the grating 406 as a metal plate with holes, various other embodiments of the grating 406 may be known to those skilled in the art.
  • the grating 406 may be made up of mesh wire, glass, plastic, and the like.
  • various other ways of varying opacity may be known to those skilled in the art, such as etching the glass or plastic to vary its transparency, and the like.
  • the grating 406 can be combined with filters to vary the characteristics of the light entering the optic port 160.
  • the filter can be a thermal filter, an Ultraviolet filter, an Infrared filter, Chromatic filter, or a combination thereof.
  • the illumination intensity control is dependent on the width of the aperture 404 and the opacity of the grating 406.
  • the width of aperture 404 increases, increasing the illuminated area of the optic port 160.
  • the illuminated area of the optic port 160 continues to increase until the width of the aperture 404 equals the diameter of the optic port 160, that is, until the second point 418. Beyond the second point 418, moving clockwise, the illumination intensity is independent of the width of aperture 404.
  • the illumination intensity is however still dependent on the opacity of the grating 406.
  • illumination intensity is controlled by the opacity of grating 406 and width of aperture 404, but after the second point 418, illumination intensity is just the function of the opacity of the grating 406.
  • the control curve is the illumination intensity versus the angle of rotation of the driving means 240.
  • the control curve 500 for the control member illustrated in FIG. 4 is shown in FIG. 5.
  • control member 210 has the various advantages over the above background arts. Firstly, a finer and gradual control of illumination intensity at lower light intensities and desired control of illumination intensity at higher intensities. Secondly, a substantially symmetrical distribution of the light across the optic port and thereby across the fiber optic bundle. And lastly, an integrated design for analog/stepped control.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Surgery (AREA)
  • Optics & Photonics (AREA)
  • Biomedical Technology (AREA)
  • Medical Informatics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Biophysics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Pathology (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Endoscopes (AREA)

Abstract

L'invention concerne un dispositif de réglage de l'éclairage (200) dans un système d'imagerie endoscopique, lequel dispositif comprend: un organe de réglage (210) comportant une ouverture (404) sous la forme d'un passage de taille variable formé dans un élément de support (402), ledit organe de réglage étant disposé entre un port optique (160) et une source de lumière (112), le mouvement de l'ouverture (404) sur le port optique (160), qui correspond au mouvement de l'organe de réglage (210), permettant de régler la surface du port optique (160) qui transmet la lumière à l'endoscope (190) et, par conséquent, l'intensité de l'éclairage sur le site d'examen; et un réseau (406) comportant au moins deux trous (410, 412), dont le motif peut varier le long d'une courbe de guidage (414) de manière à faire progressivement varier l'opacité du réseau (406), le réglage de l'intensité de l'éclairage dépendant de la largeur de l'ouverture (404) et de l'opacité du réseau (406).
PCT/IN2008/000488 2008-01-18 2008-08-06 Dispositif de réglage de l'éclairage dans un système d'imagerie endoscopique Ceased WO2009090664A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BRPI0822009-3A BRPI0822009A2 (pt) 2008-01-18 2008-08-06 Dispositivo de controle de iluminação em um sistema de formação de imagens endoscópicas
CN2008800205964A CN101801258B (zh) 2008-01-18 2008-08-06 内窥镜成像系统中的照明控制装置
ZA2010/00570A ZA201000570B (en) 2008-01-18 2010-01-26 An illumination control device in an endoscopic imaging system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN129/KOL/08 2008-01-18
IN129KO2008 2008-01-18

Publications (1)

Publication Number Publication Date
WO2009090664A1 true WO2009090664A1 (fr) 2009-07-23

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ID=40885094

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2008/000488 Ceased WO2009090664A1 (fr) 2008-01-18 2008-08-06 Dispositif de réglage de l'éclairage dans un système d'imagerie endoscopique

Country Status (5)

Country Link
CN (1) CN101801258B (fr)
BR (1) BRPI0822009A2 (fr)
RU (1) RU2010134429A (fr)
WO (1) WO2009090664A1 (fr)
ZA (1) ZA201000570B (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN103185547A (zh) * 2011-12-30 2013-07-03 广明光电股份有限公司 力反馈装置的光栅结构

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101134770B1 (ko) * 2011-07-22 2012-04-13 양완석 휴대용 인체외시경 영상장치
CN103690137B (zh) * 2014-01-07 2015-05-20 深圳开立生物医疗科技股份有限公司 一种内窥镜光源亮度自动调节方法和装置
CN106802276B (zh) * 2017-01-17 2019-04-05 哈尔滨理工大学 双转盘式显微扫描结构
US11835769B2 (en) * 2021-08-17 2023-12-05 Applied Materials Israel Ltd. Adjustable attenuation optical unit

Citations (1)

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Publication number Priority date Publication date Assignee Title
US4729018A (en) * 1985-09-24 1988-03-01 Kabushiki Kaisha Toshiba Endoscope apparatus with rotating shutter

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Publication number Priority date Publication date Assignee Title
US5980454A (en) * 1997-12-01 1999-11-09 Endonetics, Inc. Endoscopic imaging system employing diffractive optical elements
JP2003290140A (ja) * 2002-03-29 2003-10-14 Fuji Photo Optical Co Ltd 内視鏡用光源装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4729018A (en) * 1985-09-24 1988-03-01 Kabushiki Kaisha Toshiba Endoscope apparatus with rotating shutter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103185547A (zh) * 2011-12-30 2013-07-03 广明光电股份有限公司 力反馈装置的光栅结构

Also Published As

Publication number Publication date
CN101801258B (zh) 2012-05-30
RU2010134429A (ru) 2012-02-27
CN101801258A (zh) 2010-08-11
BRPI0822009A2 (pt) 2015-07-21
ZA201000570B (en) 2010-11-24

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