JP2012008474A - Electronic endoscope device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope device for suppressing electromagnetic disturbance from an illumination light source by making an electronic circuit arranged together with an illumination light source in the same space hard to suffer electromagnetic interference caused by driving the illumination light source.SOLUTION: The electronic endoscope device includes: a rotation part 6 windingly storing an insertion part inserted into a test object; a body part 8 connected to the rotation part 6; a light source 51 arranged in the rotation part 6 and emitting illumination light to be transmitted to an illumination part; and electronic circuits 21 and 24 arranged in the rotation part 6 and including a circuit board for performing image processing of a signal from an imaging device. Each of the light source 51 and the electronic circuits 21 and 24 is arranged separately from each other with respect to a rotation center O of the rotation part 6.

Description

  The present invention relates to an electronic endoscope apparatus.

2. Description of the Related Art In recent years, endoscope apparatuses having a long endoscope insertion portion have been widely used in the medical field and the industrial field.
Endoscopes used in the medical field include various types of treatment tools that are used to observe organs in a body cavity by inserting an elongated insertion portion into a body cavity, or inserted into an insertion channel of a treatment tool as necessary. Can be treated.

  On the other hand, endoscopes used in the industrial field are used to insert a insertion portion into boilers, gas turbine engines, automobile engine bodies, piping of various plants, etc. In addition, observation and inspection of corrosion can be performed.

  Some of such endoscope apparatuses include a light source device that illuminates a living body into which an insertion portion is inserted or a pipe.

  For example, as disclosed in Patent Document 1, an endoscope apparatus using a laser diode for illumination light in addition to a light source lamp for illumination light has been proposed. This conventional endoscope apparatus includes a Peltier element that cools a laser diode, and a heat sink is closely fixed to the Peltier element, and the heat of the heat sink is cooled and dissipated by forcible supply and exhaust by a fan. A technology that prevents the diode from being heated at high temperatures is disclosed.

JP 2006-43271 A

  However, when a laser diode is used as an illumination light source as in a conventional endoscope apparatus, radiation noise (radiated electromagnetic wave) is generated from the driven laser diode as compared with a halogen lamp, and the laser diode is in the same space as the laser diode. There is a possibility that an electronic circuit disposed in the circuit will be subjected to electromagnetic interference, resulting in electromagnetic interference (EMI). Even if a laser diode is not used as the illumination light source, for example, even when a xenon lamp is used, the electronic circuit disposed in the same space as the xenon lamp is subjected to electromagnetic interference due to the discharge of the xenon lamp. Interference (EMI) can occur.

  Therefore, there has been a demand for an electronic endoscope apparatus in which an electronic circuit disposed in the same space together with an illumination light source is less susceptible to electromagnetic interference due to driving of the illumination light source, and suppresses electromagnetic interference from the illumination light source.

  An electronic endoscope apparatus according to an embodiment of the present invention is an electronic endoscope apparatus including an illuminating unit and an imaging device, and a rotating unit that winds and stores an insertion unit to be inserted into a subject, A main body connected to the moving part, a light source arranged in the rotating part and emitting illumination light to be transmitted to the illuminating part, and a signal from the imaging device arranged in the rotating part. An electronic circuit including a circuit board to be processed, wherein the light source and the electronic circuit are arranged at positions separated from each other with respect to a rotation center of the rotation unit.

  According to the present invention, there is provided an electronic endoscope apparatus in which an electronic circuit disposed in the same space together with an illumination light source is less susceptible to electromagnetic interference due to driving of the illumination light source and suppresses electromagnetic interference from the illumination light source. be able to.

The perspective view which shows the whole structure of an electronic endoscope apparatus. Block diagram showing the internal configuration of the electronic endoscope apparatus Cross-sectional perspective view showing the inside of the drum Cross-sectional perspective view showing the configuration of a laser diode (LD) unit Sectional drawing which shows an example of the layout of the structure arrange | positioned in a drum part Sectional drawing which shows the structure seen from the cover body surface direction used as the outer side of a drum part Sectional drawing which shows the structure which looked at the side direction of the cover body inside a drum part Sectional drawing which shows the structure of the drum part containing a cover body

  Hereinafter, the electronic endoscope apparatus according to the present invention will be described. In the following description, the drawings based on each embodiment are schematic, and the relationship between the thickness and width of each part, the thickness ratio of each part, and the like are different from the actual ones. It should be noted that the drawings may include portions having different dimensional relationships and ratios between the drawings.

First, an embodiment of the present invention will be described with reference to the drawings. In the following description, for example, an industrial endoscope apparatus is illustrated.
1 to 8 relate to an embodiment of the present invention, FIG. 1 is a perspective view showing the overall configuration of the electronic endoscope apparatus, and FIG. 2 is a block diagram showing the internal configuration of the electronic endoscope apparatus. 3 is a cross-sectional perspective view showing the configuration inside the drum portion, FIG. 4 is a cross-sectional perspective view showing the configuration of the laser diode (LD) unit, and FIG. 5 is a cross-sectional view showing an example of the layout of the configuration arranged in the drum portion. 6 is a cross-sectional view showing a configuration viewed from the surface of the lid that is outside the drum portion, FIG. 7 is a cross-sectional view showing the configuration inside the drum portion as viewed from the side of the cover body, and FIG. It is sectional drawing which shows the structure of the drum part containing a cover body.

  As shown in FIG. 1, an electronic endoscope apparatus (hereinafter simply referred to as an endoscope apparatus) 1 according to the present embodiment includes a distal end portion 3, a bending portion 4, and a flexible tube portion 5 arranged in order from the distal end. The long insertion portion 2 that is formed, the drum portion 6 that is a rotation portion that is rotatably arranged and winds and stores the insertion portion 2, and the outer peripheral portion of the drum portion 6 are separated by a predetermined distance. A substantially cylindrical cover body 7 disposed so as to cover and rotating integrally with the drum section 6, a drum section 6 and a box-shaped main body section 8 to which the cover body 7 is rotatably connected; The main body 8 includes a monitor 9 that can be raised and lowered and a protection frame 10 in which a plurality of pipes are connected.

  As shown in FIG. 2, at the distal end portion 3 of the insertion portion 2, an imaging device 11 having an objective optical system and an image sensor such as a CCD and a CMOS, and laser light is transmitted by an optical fiber to forward illumination light forward. An illumination unit 12 that is an illumination optical system to irradiate is incorporated. Further, the bending portion 4 of the insertion portion 2 is provided with a plurality of bending pieces (not shown) that are rotatably connected, and four bending operation wires 15 that are rotated by pulling and loosening the plurality of bending pieces are provided. ing. These four bending operation wires 15 are respectively connected to the expansion and contraction bodies 14 that are four artificial muscle portions in the actuator 13 for changing the bending portion 4.

  The actuator 13 is disposed at the distal end portion of the flexible tube portion 5 in the vicinity of the proximal end of the bending portion 4. And the four expansion-contraction bodies 14 of the actuator 13 are comprised from the flexible hollow silicon tube etc. which were comprised so that it might expand-contract in the front-back direction by supply / discharge of fluid (air). One end of each of the four air tubes disposed in the flexible tube portion 5 is connected to each of the four expansion / contraction bodies 14.

  The bending control solenoid valve unit 23 controls supply and exhaust of fluid (air) by four internal solenoid valves, and four air tubes each of which is extended to the actuator 13 on the secondary side of these four solenoid valves. Is connected to one of the other ends.

  The bending control electromagnetic valve unit 23 communicates with an air pressure adjuster 33 provided in the main body 8 via an air tube or the like. That is, the bending control electromagnetic valve unit 23 is supplied with fluid (air) from the air pressure regulator 33 to the primary side of the four electromagnetic valves via an air tube or the like. The bending control electromagnetic valve unit 23 is electrically connected to the bending control circuit 24 and is driven and controlled by the bending control circuit 24.

  Thus, the endoscope apparatus 1 according to the present embodiment pulls each bending operation wire 15 by controlling the expansion and contraction back and forth by supplying and discharging fluid (air) to and from the four expansion / contraction bodies 14 of the actuator 13. The plurality of bending pieces are rotated and the bending portion 4 of the insertion portion 2 is configured to be variable in bending. The bending control circuit 24 is electrically connected to a control unit 32 in the main body 8 via a slip ring 25 described later.

  The drum unit 6 includes an LD (laser diode) unit 20 that is an illumination light source unit and an imaging control unit that is an electronic circuit including a circuit board that processes an imaging signal from the imaging unit 11. A unit 21, an illumination control circuit 22, a bending control electromagnetic valve unit 23 provided with four electromagnetic valves, a bending control circuit 24, and a slip ring 25 are incorporated.

  The camera control unit 21 is electrically connected to and controlled by the imaging device 11 at the distal end portion 3, and is also electrically connected to a control unit 32 provided in the main body unit 8 via a slip ring 25.

  The LD unit 20 is connected to an optical fiber that transmits laser light to the illumination unit 12. This optical fiber is inserted through the bending portion 4 and the flexible tube portion 5 and extends to the illumination portion 12 of the distal end portion 3. The illumination control circuit 22 that drives and controls the LD unit 20 is also electrically connected to the control unit 32 in the main body unit 8 via the slip ring 25. The detailed description of the LD unit 20 will be described later.

  The main body 8 incorporates a power supply circuit 31, a control unit 32 serving as a main CPU electrically connected to the power supply circuit 31, and an air pressure regulator 33 including an air filter. In addition, the main body 8 has an external power supply plug 34 to the power supply circuit 31, a detachable battery 35 as a secondary battery, and an air piping such as a factory that supplies fluid (air) to the air pressure regulator 33. And an detachable gas cartridge 37 as a secondary fluid supply source.

  The main body 8 is electrically connected to the control unit 32 by a wired connection, and is provided with an operation remote control 38 for performing operation instructions such as bending operation of the bending unit 4 and various settings, and the monitor 9 described above. . Note that the operation remote controller 38 may output an instruction signal to the control unit 32 wirelessly.

  In the endoscope apparatus 1 of the present embodiment, the drum portion 6 is rotatably connected to the main body portion 8 by a rotary joint mechanism 40 that is a rotation support mechanism. The endoscope apparatus 1 is configured such that the insertion portion 2 can be wound and housed in a rotatable drum portion 6.

  The rotary joint mechanism 40 is fixed so as to be rotated integrally with the drum portion 6, and is a slip ring that electrically connects the main body portion 8 and the drum portion 6 that rotates relative to the main body portion 8. 25 is arranged. That is, as described above, the slip ring 25 includes the camera control unit 21, the illumination control circuit 22, the bending control electromagnetic valve unit 23, and the bending control circuit 24 provided in the drum unit 6 that rotates with respect to the main body unit 8. And the control unit 32 provided in the main body unit 8 are electrically connected so that various electric signals can be transmitted and received.

Here, a more detailed configuration of the drum unit 6 and components disposed in the drum unit 6 will be described below mainly based on FIG. 3 and FIG. 4.
As shown in FIG. 3, the drum portion 6 has a cylindrical, for example, metallic barrel 41 around which the insertion portion 2 is wound on the outer peripheral surface, and a substantially circular plate that covers the opening of the barrel 41. For example, a metallic lid 42 (see FIG. 7, not shown in FIG. 3) is disposed as an outer side surface orthogonal to the rotation axis.

  The body 41 is accommodated in a cylindrical cover body 7 having a substantially U-shaped cross section. The body portion 41 is an inner side surface of the drum portion 6 that is orthogonal to the rotation shaft disposed on the main body portion 8 side of the cover body 7 so that the center position is concentric with the center position of the cover body 7. It is fixed to the base surface 43 by a fixing member such as a screw. The center positions of the body portion 41 and the cover body 7 serve as a rotation axis in the drum portion 6 and the cover body 7.

  Note that the cover body 7 is made of, for example, metal, and is inserted into the base surface 43 and the insertion portion winding that extends to the opposite side of the main body portion 8 and extends in a cylindrical shape in a circumferential direction orthogonal to the base surface 43. A plurality of holes 7 a are formed in the turning surface 44. These hole portions 7 a reduce the weight of the cover body 7 and reduce air resistance to the cover body 7 that rotates integrally with the drum portion 6.

  Further, the drum portion 6 is in a space portion 45 surrounded by a body portion 41, a lid body 42 that closes one opening portion of the body portion 41, and a base surface 43 of the cover body 7 that closes the other opening portion. The camera control unit 21, the illumination control circuit 22, the bending control electromagnetic valve unit 23, the bending control circuit 24, the slip ring 25, and a part of the rotary joint mechanism 40 are arranged and fixed.

  The camera control unit 21 is configured by a substrate on which various electronic components that exchange signals with the control unit 32 of the main body unit 8 and perform image processing of an image pickup signal from the image pickup device 11 having an image sensor are mounted. The illumination control circuit 22 also includes a board on which various electronic components that exchange signals with the control unit 32 and drive and control various components of the LD unit 20 are mounted. The bending control circuit 24 also includes a substrate on which various electronic components that exchange signals with the control unit 32 and drive and control the four electromagnetic valves of the bending control electromagnetic valve unit 23 are mounted.

  As shown in FIG. 4, the LD (laser diode) unit 20 of the present embodiment includes a laser diode (LD) 51 (also referred to as a semiconductor laser or a diode laser) that is a light source, and a laser diode 51 that has an endothermic surface. A Peltier element 52 (see FIG. 7; not shown in FIG. 4) disposed in surface contact with the housing block, and a heat sink 53 disposed in surface contact with a heat generation (radiation) surface opposite to the heat absorption surface of the Peltier element 52 The laser diode 51 and the heat sink 53 are fixed in such a state that the cooling fan 54 fixed to the end face side where the plurality of heat radiation fins of the heat sink 53 extend and the Peltier element 52 are pressed against the heat sink 53 via the laser diode 51. For example, a light source unit 50 having a metallic stationary ring 55 is provided to constitute a closed space, and the light source unit 5 Of which mainly comprises an LD unit frame 56 for housing over the laser diode 51.

  Note that the Peltier element 52 is disposed between the laser diode 51 and the heat sink 53. Therefore, an elastic member having a buffering property is fixed so that the fixing ring 55 and the laser diode 51 do not directly contact each other so that the Peltier element 52 is not damaged by the pressing force from the laser diode 51 by tightening with the fixing ring 55. It is disposed between the ring 55 and the laser diode 51. The fixed ring 55 has a cylindrical shape on the upper side and a rectangular shape on the lower side, and the laser irradiation end of the laser diode 51 is exposed on the upper side to press the Peltier element 52 downward.

  The LD unit frame 56 is, for example, a metal box, and the flexible tube portion 5 of the insertion portion 2 is connected so as to extend from one surface. Further, the LD unit frame 56 is substantially L-shaped when viewed from above the paper surface, and has a substantially L-shaped outer angle so as to have an inclined surface that obliquely connects two orthogonal surfaces on the long side. The part is cut out. An optical fiber (not shown) that transmits the emitted laser light is connected to the light emitting and emitting end of the laser diode 51, and this optical fiber is inserted through the insertion portion 2.

  As described above, the endoscope apparatus 1 according to the present embodiment can irradiate the illumination light by the highly directional laser beam to the deep part of the pipe line by adopting the laser diode 51 as the illumination light source. Therefore, the endoscope apparatus 1 of the present embodiment has a configuration suitable for industrial use. Needless to say, the laser light from the laser diode 51 can be applied to a medical endoscope apparatus by setting it to a small output.

Subsequently, an example of the layout of the components arranged in the drum unit 6 will be described below mainly based on FIGS.
As shown in FIG. 5, in the space 45 of the drum unit 6, the camera control unit 21 having a substrate on which various electronic components that perform image processing of image signals are mounted, and the laser diode 51 of the LD unit 20 serve as a rotation axis. The rotary joint mechanism 40 and the slip ring 25 are arranged and fixed so as to be separated from each other by a predetermined distance in the point-symmetrical direction of the rotation center O of the slip ring 25. That is, the camera control unit 21 and the laser diode 51 are disposed at positions that are separated from each other with respect to the rotation center of the drum unit 6.

  Further, the bending control circuit 24 is also arranged and fixed so as to be separated from the arrangement position of the laser diode 51 by a predetermined distance in the point-symmetrical direction of the rotary joint mechanism 40 and the rotation center O of the slip ring 25. The bending control electromagnetic valve unit 23 is arranged at a neighboring position so as to shorten the signal transmission path from the bending control circuit 24, here, on the outer side (outer peripheral portion) side of the drum portion 6 in a direction away from the rotation center O. Has been.

  And the illumination control circuit 22 is arrange | positioned in the adjacent vicinity position and the upper side of LD unit 20 in FIG. 5 so that the signal transmission path to LD unit 20 may become short.

  As described above, the endoscope apparatus 1 according to the present embodiment includes a plurality of electronic circuits (camera control unit 21, illumination control circuit 22, and curvature control circuit 24), laser light as illumination light, and a laser diode as a light source. A laser diode 51 that emits high-frequency light when a high-frequency voltage is applied to the light source device (LD unit 20) using 51 and disposed in the space portion 45 inside the drum unit 6 that winds and houses the insertion portion 2. The camera control unit 21 that performs image processing of an imaging signal that is susceptible to electromagnetic interference is disposed so as to be separated from the center of the rotation axis O by a predetermined distance so as to be away from the center of rotation. It has become.

  In particular, the camera control unit 21 is an electronic circuit that performs image processing on an image pickup signal output from the image pickup device 11. When the camera control unit 21 receives electromagnetic interference, noise is added to the processed image signal and is displayed on the monitor 9. This causes a reduction in the image quality of the endoscopic image.

  For this reason, the camera control unit 21 of the electronic circuit arranged in the space 45 of the same drum unit 6 together with the laser diode 51 as the illumination light source rotates the rotation shaft so as to be positioned away from the laser diode 51. It is arranged at a position away from the center O in the point-symmetrical direction, and it becomes difficult to receive electromagnetic interference from high-frequency light emission by driving the laser diode 51, and electromagnetic interference from the laser diode 51 is suppressed.

Therefore, the endoscope apparatus 1 according to the present embodiment has an arrangement configuration in which the camera control unit 21 is suppressed from electromagnetic interference from the laser diode 51 and the operation is hardly hindered.
Similarly, the bending control circuit 24 disposed in the space 45 of the same drum portion 6 together with the laser diode 51 is also point-symmetric with respect to the rotation center O of the rotation shaft so as to be away from the laser diode 51. Therefore, the electromagnetic interference from the laser diode 51 is suppressed and the operation is hardly hindered. As a result, noise is not easily applied to the control signal output from the bending control circuit 24, and the operation of the bending control electromagnetic valve unit 23 that is driven and controlled by the bending control circuit 24 is not easily inhibited.

  Furthermore, the space part 45 of the drum part 6 in which the LD unit 20, the camera control unit 21, the illumination control circuit 22, and the bending control circuit 24 are arranged is all a metallic body part 41, a lid body 42, and a cover body. 7 is configured to be able to maintain electromagnetic non-interference with an external device by providing a space surrounded by the metal casing parts of the drum portion 6 constituted by the base surface 43 of the seventh portion.

  In addition, the laser diode (LD) unit 20 has an LD unit frame 56 that is substantially L-shaped, and has a slope that obliquely connects two orthogonal surfaces on the long side as described above. 5, the drum portion 6 is disposed so as not to interfere with the body portion 41. Furthermore, the LD unit frame 56 is formed in an approximately L shape to form two orthogonal surfaces on the short side, so that these two surfaces are opposed to the rotary joint mechanism 40. Thus, by making the laser diode (LD) unit 20 into a substantially L-shaped block shape, dead space in the space portion 45 of the drum portion 6 where space is restricted is eliminated, and various components are efficiently used without waste. Can be arranged.

  In the above description, the illumination light source is the laser diode 51. However, the present invention is not limited to this and can be applied to various light sources (such as various light emitting elements). In particular, when a xenon lamp is used as the light source, there is a high possibility that electromagnetic interference occurs in various electronic circuits due to the discharge of the xenon lamp. Therefore, electromagnetic interference due to discharge of the xenon lamp can be suppressed by arranging various electronic circuits on the point-symmetrical side of the rotation center O of the rotation shaft so as to be away from the xenon lamp.

  By the way, the space portion 45 of the drum portion 6 becomes a heating element that raises the temperature of the laser diode 51 by driving the laser diode 51 that emits high frequency light, and the temperature rises to about 50 ° C., for example. Therefore, as described above, the light source unit 50 of the LD unit 20 absorbs the heat from the laser diode 51 by the Peltier element 52, transfers the heat to the heat sink 53, and dissipates the heat from the heat sink 53 by the cooling fan 54. The intake air diffuses heat into the space 45 and suppresses the temperature rise of the laser diode 51.

  However, if the heat diffused by the cooling fan 54 is not exhausted, the temperature in the space 45 is raised, and various mechanical components (such as the bending control electromagnetic valve unit 23) and electrical components (cameras) in the space 45 are heated. There is a possibility that the operating temperature range of the control unit 21, the illumination control circuit 22, the bending control circuit 24, etc.) will be exceeded.

  Therefore, the drum unit 6 of the present embodiment has a configuration that prevents the temperature in the space 45 from becoming high and efficiently exhausts heat.

  Specifically, as shown in FIGS. 6 and 7, the lid 42 and the cover body 7, which are side surfaces of the drum portion 6 (here, a surface substantially orthogonal to the rotating shaft). A plurality of (here, four arc-shaped hole portions 42a and 43a) spaced apart at equal intervals are formed around the rotation center O on each of the base surfaces 43.

  Then, as shown in FIG. 8, the light source unit 50 disposed in the space 45 of the drum unit 6 is close to the outside air, that is, close to the lid 42 of the drum unit 6 in the direction away from the main body unit 8. The laser diode 51 is arranged at the position, and the Peltier element 52, the heat sink 53, and the cooling fan 54 are arranged in this order toward the main body 8. That is, the cooling fan 54 is disposed at a position close to the base surface 43 of the cover body 7.

  With such a configuration, the heat of the sucked heat sink 53 is discharged from the plurality of holes 43 a formed in the base surface 43 of the cover body 7 by the cooling fan 54. Further, since the cooling fan 54 is driven in the blowing direction from the lid body 42 side to the base surface 43 side of the cover body 7, the plurality of holes 42 a formed in the lid body 42 serve as air inlets for sucking outside air, and the cover A plurality of holes 43a formed in the base surface 43 of the body 7 have an air flow (a broken line arrow A in FIG. 8) in a direction that serves as an exhaust port for exhausting warmed air that stays in the space 45 of the drum unit 6. Arise.

  Thereby, when the cooling fan 54 is driven, outside air always enters the space portion 45 from the plurality of hole portions 42a and heat in the space portion 45 is exhausted from the plurality of hole portions 43a. It is prevented that the temperature inside the part 45 exceeds the operating temperature range of various mechanical components and electrical components.

  Furthermore, since the laser diode 51 is arranged at a position close to the lid body 42, the laser diode 51 acts on the laser diode 51 quickly by the outside air sucked from the plurality of holes 42a. Therefore, the heat of the laser diode 51 is absorbed by the outside air, and the temperature rise of the laser diode 51 is suppressed.

  As described above, the drum section 6 of the present embodiment defines the arrangement position of the laser diode 51 and the cooling fan 54 of the light source unit 50 and the blowing direction of the cooling fan 54, so that the lid 42 is placed in the space 45. The air flow A is generated in the direction of the base surface 43 of the cover body 7 from the plurality of holes 42a formed in the lid body 42 and the outside air is efficiently taken into the plurality of holes formed on the base surface 43 of the cover body 7. Since the heat in the space 45 is discharged from the hole 43a, the temperature in the space 45 is prevented from being increased.

  The main body 8 is provided with electrical circuit configurations such as a power supply circuit 31 and a control unit 32, and well-known cooling means (not shown) for preventing the inside from being heated to a high temperature. . Therefore, the drum portion 6 is formed on the base surface 43 of the cover body 7 adjacent to the main body portion 8 by taking in outside air having a little influence on the heat radiation of the main body portion 8 from the plurality of hole portions 42 a formed in the lid body 42. By using the airflow A in the direction in which the heat in the space 45 is exhausted from the plurality of hole portions 43a, the heat from the main body portion 8 is not taken in, and the structure is hardly affected by heat.

  By the way, the endoscope apparatus 1 of this Embodiment has illustrated industrial use. This industrial endoscope apparatus 1 may be used in an outdoor environment. Therefore, the endoscope apparatus 1 includes drip-proof means that prevents the intrusion of liquid such as rainwater as much as possible in the space 45 of the drum unit 6.

  Specifically, as shown in FIG. 8, the lid 42 of the drum portion 6 has a cylindrical portion concentric with the rotation center (O) protruding outward, and an outward flange is formed at the protruding end of the cylindrical portion. A drip-proof portion 62 formed with a cylindrical portion concentric with the rotation center (O) is extended to the space portion 45 side, and the plurality of hole portions 42a are formed on the bottom surface portion for drip-proofing. And a recess 63.

  Further, the rotary joint mechanism 40 protrudes further outward from the drip-proof portion 62 of the lid 42, and wraps around the outward flange of the drip-proof portion 62 without contacting the projection 42 with the protruding portion. A drip-proof cap 61, which is a disk having a U-shaped cross section, is provided so as to be concentric with the rotation center (O). That is, the cylindrical wall portion constituting the outer peripheral portion of the drip-proof cap 61 wraps to the lid 42 side beyond the outward flange of the drip-proof portion 62, thereby allowing liquid such as rainwater to pass through the space portion of the drum portion 6. 45 is prevented from entering through the plurality of holes 42a.

  Further, the drip-proof cap 61 is fixed to the rotary joint mechanism 40 so as to be separated from the outward flange by a predetermined distance in the circumferential direction without contacting the outward flange of the drip-proof portion 62. Therefore, since the drip-proof cap 61 is not in contact with the lid 42 including the drip-proof portion 62, the above-described operation is performed without blocking outside air taken into the space 45 from the plurality of holes 42 a formed in the lid 42. The airflow A can be generated.

  Further, a cylindrical portion concentric with the rotation center (O) protrudes outward also on the base surface 43 of the cover body 7, and a drip-proof portion 64 in which an outward flange is formed at the protruding end of the cylindrical portion. Is formed. A cylindrical wall portion 72 that wraps to the outward flange of the drip-proof portion 64 without contacting the base surface 43 of the cover body 7 is provided on one surface of the casing 71 facing the drum portion 6 of the main body portion 8. It extends so as to be concentric with the rotation center (O). Also here, the cylindrical wall portion 72 wraps over the outward flange of the drip-proof portion 64 and wraps toward the base surface 43 side of the cover body 7, whereby a plurality of liquids such as rainwater can enter the space portion 45 of the drum portion 6. It is prevented that the hole 43a enters.

  Further, on one surface of the casing 71 of the main body 8, a cylindrical shape is formed on the base surface 43 side so as not to contact the base surface 43 of the cover body 7 at a position separated by a predetermined distance above and below the cylindrical wall portion 72. Plate-like ridges 73 are provided so as to project apart from the wall portion 72 by a predetermined distance, and further, liquid such as rainwater is introduced into the space 45 of the drum unit 6 by these ridges 73. The plurality of holes 43a are prevented from entering.

  The cylindrical wall portion 72 and the flange 73 are not in contact with the outward flange of the drip-proof portion 64 and are separated from the outward flange by a predetermined distance in the circumferential direction. The above-described airflow A can be generated without blocking the heat in the space 45 exhausted from the plurality of formed holes 43a.

  The invention described in the above embodiment is not limited to the embodiment and modifications, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, 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.

DESCRIPTION OF SYMBOLS 1 ... Endoscope apparatus 2 ... Insertion part 3 ... Tip part 4 ... Bending part 5 ... Flexible pipe part 6 ... Drum part 7 ... Cover body 7a ... Hole part 8 ... Main-body part 9 ... Monitor 10 ... Protection frame 11 ... Imaging Device 12 ... Illuminating unit 13 ... Actuator 14 ... Expansion / contraction body 15 ... Bending operation wire 20 ... Laser diode (LD) unit 21 ... Camera control unit 22 ... Illumination control circuit 23 ... Bending control solenoid valve unit 24 ... Bending control circuit 25 ... Slip ring 31 ... Power supply circuit 32 ... Control unit 33 ... Pneumatic regulator 34 ... Plug 35 ... Battery 36 ... Air connector 37 ... Gas cartridge 38 ... Operation remote control 40 ... Rotary joint mechanism 41 ... Body 42 ... Ladders 42a, 43a ... Hole 43 ... Side 44 ... Insertion winding surface 45 ... Space 50 ... Light source unit 51 ... Laser diode 52 ... Peltier element 53 ... Heat sink 54 ... Cooling fan 55 ... Fixed ring 56 ... Unit frame 61 ... Drip-proof cap 62, 64 ... Drip-proof portion 63 ... Recess 71 ... Casing 72 ... Cylindrical wall 73 ... 庇 A ... Airflow O ... Turning center

Claims (8)

In an electronic endoscope apparatus including an illumination unit and an imaging device,
A rotating part for winding and storing an insertion part to be inserted into a subject;
A main body connected to the rotating part;
A light source disposed in the rotating unit and emitting illumination light to be transmitted to the illumination unit;
An electronic circuit that is disposed in the rotating unit and includes a circuit board that performs image processing on a signal from the imaging device;
With
The electronic endoscope apparatus, wherein the light source and the electronic circuit are disposed at positions separated from each other with respect to a rotation center of the rotation unit.   The electronic endoscope apparatus according to claim 1, wherein the light source emits the illumination light by high-frequency light emission or discharge light emission. Forming a space inside the rotating part;
The electronic endoscope apparatus according to claim 1, wherein the light source and the electronic circuit are arranged in the space portion.   The electronic endoscope apparatus according to claim 3, wherein the space portion is formed so as to be surrounded by a metal casing component.   The space portion is formed, an exhaust port for exhausting the heat of the space portion is provided on the opposite inner side surface of the main body portion at a position close to the main body portion, the space portion is formed, and the direction away from the main body portion is The electronic endoscope apparatus according to claim 3, wherein an intake port for sucking outside air is provided on an outer side surface opposed to the inner side surface. A cooling fan that diffuses the heat of the light source in the space is provided,
The said cooling fan is arrange | positioned in the vicinity of the said exhaust port, an external air is taken in in the said space from the said inlet, and the airflow which discharges | emits the heat in the said space from the said exhaust port is generated. 5. The electronic endoscope according to 5.   The electronic endoscope apparatus according to claim 6, wherein the light source is disposed in the vicinity of the intake port.   The drip-proof means for preventing the liquid from entering the exhaust port and the intake port is provided on each of the inner side surface and the outer side surface. The electronic endoscope apparatus according to claim 1.

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