JP6081208B2 - Endoscope - Google Patents

Description

  The present invention relates to an insertion device including a light guide that guides illumination light emitted from a light emitting element and incident on an incident end face to an exit end face in an insertion portion that is inserted into a subject.

  In recent years, endoscopes inserted into a subject have been widely used in the medical field and the industrial field. Endoscopes used in the medical field observe an organ in a body cavity by inserting a long and thin insertion portion into a body cavity as a subject, and insert a channel for a treatment tool provided in the endoscope as necessary Various treatments can be performed using the treatment tool inserted in the inside.

  In addition, endoscopes used in the industrial field are designed to insert a long and narrow insertion portion of an endoscope into a jet engine or a subject such as a pipe of a factory. Observations such as corrosion and inspections such as various treatments can be performed.

  In addition, observation within a subject using an endoscope is usually performed by supplying illumination light into the subject from a distal end in the insertion direction of the insertion portion (hereinafter simply referred to as a distal end).

  Specifically, the illumination light is directly supplied into the subject from the light emitting element provided at the distal end of the insertion portion, or the endoscope is provided in the endoscope or the apparatus main body to which the endoscope is connected. Illumination light from the light source is incident on at least an incident end surface of the light guide inserted into the insertion portion in the endoscope, and is guided by the light guide to the exit end surface of the light guide positioned on the distal end side of the insertion portion. A configuration for supplying the sample into the subject from an illumination lens provided at the distal end of the insertion unit is well known.

  Here, in the configuration in which the illumination light from the light source is supplied into the subject using the light guide, the portion on the incident end face side of the light guide has a sufficient amount of light when the light source is composed of a light emitting element, for example. The incident end surface is fixed so as to abut the light emitting surface of the light emitting element. In this case, if the center of the light emitting surface and the axis center of the light guide are deviated, the light emitting element is sufficient. It becomes impossible to make the amount of illumination light enter the incident end face.

  In view of such circumstances, in Patent Document 1, in the connection configuration between optical fibers, in the alignment of the resectable side optical fiber held by the reusable holder and the plug side optical fiber held by the plug holder. The plug holder is configured to be movable in the vertical and horizontal directions with respect to the resectable holder using the holder aligning means, so that the releasable side optical fiber and the plug side optical fiber are moved by moving the plug holder. A structure that can be aligned is disclosed.

  Therefore, if the alignment means of Patent Document 1 is applied to the movement of the substrate on which the light emitting element is provided, the center of the light guide can be aligned with the center of the light emitting surface.

  In Patent Document 2, the incident end face is connected to a substrate provided with a light emitting element in a state where a portion on the incident end face side of the light guide is inserted into the through hole of the fixing member and held by the fixing member. Is fixed to the substrate by bringing the corner of the light emitting element into contact with the L-shaped positioning groove provided on the contact surface of the fixing member to the substrate. A configuration is disclosed in which the center axis of the light guide can be aligned with the center of the light emitting surface after connecting the members.

JP 2011-152369 A JP 2009-118966 A

  By the way, there are multiple types of endoscopes with different diameters and lengths of the insertion section so that they can be used properly according to the diameter of the conduit to be examined, the distance from the entrance of the subject to the examination site, etc. The endoscope has been commercialized.

  In addition, the larger the diameter of the insertion portion, the larger the observation lens provided at the tip of the insertion portion and the imaging device for imaging, and the light guide having a larger diameter can be used. A brighter and clearer observation image in the subject can be obtained.

  In addition, since the light guide can supply a large amount of illumination light into the subject as the diameter increases, when the insertion portion has a large diameter, the light guide inserted into the insertion portion includes: It is preferable to use a large-diameter light guide. The diameter of the light guide can be changed by changing the number of fibers constituting the light guide.

  In addition, in order to reduce the manufacturing cost of an endoscope, a configuration in which a plurality of types of insertion portions with different diameters and lengths of the insertion portion are detachable from the operation portion of the endoscope is also well known.

  Here, when the connection configuration between the optical fibers described in Patent Document 1 is applied to a configuration in which the center of the light emitting surface of the light emitting element is aligned with the axial center of the light guide, the diameter of the light guide is different. However, if the alignment means is applied to the movement of the substrate provided with the light source, the center of the light emitting surface of the light emitting element and the axis center of the light guide can be made to coincide with each other. In order to accurately position the substrate using the alignment means, the alignment guide should have a positioning guide for the alignment means, and the manufacturing cost may increase by the amount of the positioning guide. there were.

  FIG. 21 is a plan view schematically showing a state in which a portion on the incident end face side of a light guide having a smaller diameter than the through hole is inserted and fixed in a through hole of a fixing member of a conventional light guide together with a light emitting surface of a light emitting element. FIG.

  In addition, in the configuration disclosed in Patent Document 2, since the portion on the incident end face side of the ride guide has a configuration that is inserted into the through hole of the fixing member, the diameter of the light guide is equal to that of the through hole. When the diameter is equal, the center of the light emitting surface of the light emitting element and the axis center of the light guide can be matched by using the contact of the corner of the light emitting element with the L-shaped positioning groove.

  However, as shown in FIG. 21, when the diameter of the light guide 901 is smaller than the diameter of the through hole 900, the portion on the incident end face side of the light guide 901 is within the through hole 900. The light guide 901 is fixed in a state of being supported at two points by the LG fixing screw 950 in a state where a part of the outer periphery of the light guide 901 is in contact with the peripheral surface 900n.

  Therefore, not only the center 903c of the light emitting surface 903m of the light emitting element is shifted from the center 901c of the light guide 901, but also the light guide 901 is supported by only two points in the through-hole 900, so that it is firmly fixed. Specifically, it is vulnerable to external force, and may easily move in the width direction W shown in FIG. 21 due to vibration, impact, or the like.

  The present invention has been made in view of the circumstances described above, and has a large-diameter light guide equal to the diameter of the through hole of the fixing member, and a small-diameter light guide having a smaller diameter than the large-diameter light guide. An object of the present invention is to provide an endoscope having a configuration that can be firmly fixed in a through hole in a state where the center of the light emitting surface of the light emitting element and the axial center of each light guide coincide with each other selectively and easily. To do.

  In order to achieve the above object, an endoscope according to one embodiment of the present invention is an endoscope including an insertion portion that is inserted into a subject, and a light emitting element and an incident end face face the light emitting element. The illumination light is further provided in at least the insertion portion, and the illumination light emitted from the light emitting element and incident on the incident end surface is supplied into the subject from the distal end in the insertion direction of the insertion portion. A light guide that guides light to an emission end surface; and a light guide fixing member that fixes a portion of the light guide on the incident end surface side. The light guide fixing member includes at least the inserted light guide. A through hole supported on the inner peripheral surface at three or more points and a first surface of the light guide fixing member in which one opening of the through hole is formed, and the through hole The first groove part into which the light emitting element can be inserted, and the second surface of the light guide fixing member in which the other opening of the through hole is formed and communicated with the through hole, A second groove part into which the light emitting element can be freely inserted. The first light guide having the same diameter as the through hole is inserted into the through hole, and the light emission element is inserted into the first groove part. When the element is inserted, the center of the light emitting surface of the light emitting element coincides with the axial center of the first light guide, and the second light having a diameter smaller than that of the first light guide in the through hole. When the guide is inserted and the light emitting element is inserted into the second groove, the light guide fixing member is formed at a position where the center of the light emitting surface coincides with the axial center of the second light guide. ing.

  According to the present invention, a light guide having a large diameter equal to the diameter of the through hole of the fixing member and a light guide having a small diameter smaller than the large diameter light guide can be selectively and easily emitted from the light emitting element. It is possible to provide an endoscope having a configuration that can be firmly fixed in the through hole in a state in which the center of the surface and the axial center of each light guide coincide with each other.

The perspective view which shows the endoscope apparatus which comprises the endoscope of this Embodiment Partial sectional view of the connecting portion along line II-II in FIG. The perspective view of the fixing member which shows the fixing member of FIG. 2 with the 1st surface side exposed The perspective view of the fixing member which shows the fixing member of FIG. 2 by exposing the second surface side opposite to the first surface The perspective view which looked at the fixing member of FIG. 4 from the V direction in FIG. The perspective view which looked at the fixing member of FIG. 5 from the VI direction in FIG. The top view of the fixing member which shows the state by which the site | part by the side of the incident end surface of a 1st light guide was penetrated to the through-hole of the fixing member of FIG. 3 exposed the 1st surface side The top view of the fixing member which shows the state by which the site | part by the side of the incident end surface of a 2nd light guide was penetrated to the through-hole of the fixing member of FIG. 4 exposed the 2nd surface side FIG. 8 is a plan view schematically showing a state where the incident end face side portion of the second light guide is fixed by an LG fixing screw in the through hole of FIG. 8 together with the light emitting surface of the light emitting element. The top view which shows roughly the state which the 1st surface of the fixing member of FIG. 3 contact | abutted to the LED board FIG. 4 is a plan view schematically showing a state in which the second surface of the fixing member of FIG. 4 is in contact with the LED substrate. The top view of the fixing member which shows the modification of the shape of the fixing member of FIG. The top view which shows schematically the state by which the site | part on the incident-end surface side of a 2nd light guide was fixed with the screw for LG fixation in the through-hole of FIG. 12 with the light emission surface of a light emitting element. FIG. 12 is a plan view schematically showing a state where the incident end face side portion of the first light guide is fixed by the LG fixing screw in the through hole of FIG. 12 together with the light emitting surface of the light emitting element. FIG. 3 and FIG. 12 are plan views schematically showing a state in which a light guide having a non-circular cross section is fixed with an LG fixing screw together with a light emitting surface of a light emitting element. The top view of the fixing member which shows the modification which made the planar shape of the through-hole of FIG. 12 square shape with the site | part on the incident-end surface side of a 1st light guide The top view of the fixing member which shows the modification which made the planar shape of the through-hole of FIG. 12 the triangle shape with the site | part of the incident end surface side of a 1st light guide The top view of the fixing member which shows the modification which made the planar shape of the through-hole of FIG. 12 the shape which combined the square-shaped site | part with the circular site | part with the site | part on the incident end surface side of a 1st light guide. The top view of the fixing member which shows the modification which made the planar shape of the through-hole of FIG. 12 the shape which added the roof-like part to the circular part with the site | part on the incident-end surface side of a 1st light guide 19 is a partial cross-sectional view showing only the fixing member along the line IIX-IIX in FIG. 19 together with the LED substrate, the light emitting element, and the portion on the incident end face side of the first light guide. A plan view schematically showing a state in which a light guide surface of a light guide having a smaller diameter than the through hole is inserted into and fixed to a through hole of a fixing member of a conventional light guide together with a light emitting surface of a light emitting element.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an endoscope apparatus including the endoscope according to the present embodiment.

  As shown in FIG. 1, an endoscope apparatus 100 includes an endoscope 1 and an apparatus main body 4 and includes a main part.

  The endoscope 1 includes an elongated insertion portion 2 inserted into a subject such as an engine, and an operation portion connected to a proximal end (hereinafter simply referred to as a proximal end) of the insertion portion 2 in the insertion direction S. 3 and a universal cord 9 extending from the operation unit 3 and detachably attached to the apparatus body 4 constitutes a main part.

  The insertion portion 2 is connected to the distal end portion 6 and the proximal end of the distal end portion 6 in order from the distal end side (hereinafter simply referred to as the distal end side) in the insertion direction S, and includes a plurality of insertion portions S along the insertion direction S. By connecting the bending pieces, for example, the bending portion 7 configured to be able to be bent in four directions of up, down, left, and right, and a long flexible portion that is connected to the base end of the bending portion 7 and has flexibility. The main portion is configured with the flexible tube portion 8.

  An imaging optical system and an illumination optical system (not shown) are provided in the distal end portion 6. Incidentally, as an image pickup element constituting the image pickup optical system, a CCD, a C-MOS or the like can be cited.

  A signal line (not shown) extending from the image sensor is inserted into the insertion unit 2, the operation unit 3, and the universal cord 9, and an extended end of the signal line is a camera control unit described later in the apparatus main body 4. Is electrically connected.

  The illumination lens constituting the illumination optical system is provided so as to be exposed at the distal end surface of the distal end portion 6, and a light guide 50 (described later) inserted into the insertion portion 2 is inserted into the illumination lens. 2 (see 2)).

  The operation unit 3 includes a grip portion 3h that is gripped by the user. Further, the operation unit 3 is provided with a bending operation lever (not shown) for bending operation of the bending unit 7, an imaging switch for instructing start of imaging, and the like. Although not shown, a monitor for displaying an observation image may be provided on the operation unit 3.

  Further, a connecting portion 10 that connects the proximal end of the insertion portion 2 and the distal end of the operation portion 3 is provided between the insertion portion 2 and the operation portion 3. Note that a plurality of types of insertion portions 2 having different diameters and lengths may be detachable from the operation portion 3 via the connection portion 10.

  In the apparatus main body 4, a camera control unit that performs signal processing of an observation image of a subject imaged by the above-described imaging element, and a recording device that records an observation image that has been signal-processed by the camera control unit (both illustrated). 2), a monitor 4m on which an observation image is displayed, a battery (not shown) for supplying power to the camera control unit, and the like.

  The apparatus body 4 may be formed integrally with the operation unit 3. That is, the operation unit 3 may also serve as the function of the device main body 4, and conversely, the device main body 4 may serve as the function of the operation unit 3.

  Next, the internal configuration of the connection unit 10 will be described with reference to FIG. FIG. 2 is a partial cross-sectional view of the connection portion taken along line II-II in FIG.

  As shown in FIG. 2, in the exterior member 11 of the connection portion 10, the outer periphery of the proximal end of the insertion portion 2 in the insertion direction S is behind the proximal end in the insertion direction S (hereinafter simply referred to as the rear). The distal end of the cylindrical joint 12 extending to is fixed with a screw or the like.

  The joint 12 is a member that connects the insertion portion 2 and the operation portion 3 along the insertion direction S, and a base end is fixed to a component (not shown) in the operation portion 3.

  Further, a holding member 17 having substantially the same outer diameter as that of the base end side of the exterior member 11 is fixed to a midway position in the insertion direction S of the joint 12 by a screw or the like (not shown). That is, the joint 12 penetrates the holding member 17 along the insertion direction S. The holding member 17 is fixed to the base end of the exterior member 11 with a screw or the like (not shown).

  Further, an LED substrate 20 having an outer shape larger than that of a light guide fixing member 16 described later is fixed to the surface of the holding member 17 on the insertion portion 2 side. A light emitting element 21 such as an LED is mounted on the surface of the LED substrate 20 on the insertion portion 2 side. The light emitting element 21 has a rectangular shape, for example, when viewed in plan from the insertion direction S.

  In addition, an elongated opening 12 a is formed along the insertion direction S and communicates with the inside of the joint 12 on the outer periphery of the joint 12 in the exterior member 11. The distal end side portion of the harness 13 inserted into the joint 12 through the opening 12a and the proximal end side (hereinafter simply referred to as the proximal end side) in the insertion direction of the light guide 50 having a circular cross section are connected to the joint 12. It is pulled out from the inside into the exterior member 11.

  The harness 13 extends from the operation unit 3 and supplies an electric power to the LED board 20 by electrically connecting the extended end formed at the distal end side portion to the LED board 20.

  The light guide 50 is inserted into the insertion portion 2 and the joint 12, and the emission end face faces the illumination lens in the distal end portion 6 as described above. The incident end face 50i of the light guide 50 is positioned in the connecting portion 10 so as to face the light emitting face 21m (see FIG. 9) of the light emitting element 21 and to contact the light emitting face 21m. A light guide fixing screw (hereinafter simply referred to as LG fixing screw) 18 as a pressing member is fixed to a guide fixing member (hereinafter simply referred to as a fixing member) 16. In addition to the screws, examples of the pressing member include a pin and a leaf spring that holds the portion on the incident end face 50i side using the elastic force of the sheet metal.

  The fixing member 16 is fixed to the surface of the holding member 17 on the insertion portion 2 side with a screw (not shown) or the like via the LED substrate 20. That is, a screw insertion hole (not shown) is formed in the LED substrate 20. In FIG. 9, the light emitting surface 21 m has a rectangular planar shape, but is not limited to a rectangular shape, and may be, for example, a circular shape.

  The light guide 50 emits illumination light so that illumination light emitted from the light emitting element 21 and incident on the incident end surface 50i is supplied from the illumination lens provided on the distal end surface of the distal end portion 6 into the subject. It guides light up to.

  Next, a fixing structure of a portion on the incident end face 50i side of the light guide 50 using the fixing member 16 in the connecting portion 10 will be described with reference to FIGS.

  3 is a perspective view of the fixing member showing the fixing member of FIG. 2 with the first surface side exposed, and FIG. 4 is a second surface of the fixing member of FIG. 2 opposite to the first surface. FIG. 5 is a perspective view of the fixing member shown in FIG. 4 as viewed from the direction V in FIG. 4, and FIG. 6 is a perspective view of the fixing member in FIG. 5 from the direction VI in FIG. It is the seen perspective view.

  7 is a plan view of the fixing member showing the first surface side exposed, showing a state where the incident end face side portion of the first light guide is inserted into the through hole of the fixing member of FIG. FIG. 8 is a plan view of the fixing member showing a state in which the portion on the incident end face side of the second light guide is inserted into the through hole of the fixing member in FIG. 4, with the second surface side exposed.

  Further, FIG. 9 is a plan view schematically showing a state where the incident end face side portion of the second light guide is fixed by the LG fixing screw in the through hole of FIG. 8 together with the light emitting surface of the light emitting element. 10 is a plan view schematically showing a state in which the first surface of the fixing member in FIG. 3 is in contact with the LED substrate, and FIG. 11 is a diagram in which the second surface of the fixing member in FIG. 4 is in contact with the LED substrate. It is a top view which shows a state roughly.

  As shown in FIGS. 3 to 8, the fixing member 16 is elongated along the width direction W orthogonal to the insertion direction S so that the shape in plan view from the insertion direction S has a substantially F shape in the lateral direction, for example, It is formed in a plate shape from a resin having high heat resistance.

  In addition, a through-hole 30 that penetrates the fixing member 16 along the insertion direction S is formed in the approximate center in the width direction W of the fixing member 16. The detailed formation position of the through hole 30 in the fixing member 16 will be described later.

  In the present embodiment, the through-hole 30 is formed in a teardrop shape in plan view from the insertion direction S having a circular portion 33 and a triangular portion 34 communicating with the circular portion 33. The fixing member 16 is penetrated in the insertion direction S while maintaining the mold shape. In addition, as an angle which 2 surfaces of the internal peripheral surface 30n which comprises the top part of the triangular site | part 34 make, 90 degrees is mentioned, for example.

  The circular portion 33 is formed in the same diameter as the first light guide 50a in the light guide 50 as shown in FIG. That is, as shown in FIGS. 7 and 8, in the present embodiment, the through diameter t of the portion on the incident end face 50 i side of the first light guide 50 a in the through hole 30 is equal to the diameter of the circular portion 33. ing. In addition, as a diameter of the 1st light guide 50a, 1.8 mm (when the diameter of the insertion part 2 is 6 mm in this Embodiment) is mentioned, for example.

  In the through hole 30, at least three or more points on the incident end surface 50 i side of the light guide 50 inserted through the through hole 30 are supported on the inner peripheral surface 30 n.

  As shown in FIG. 3, in the fixing member 16, the light emitting element 21 is communicated with the through hole 30 at the approximate center in the width direction W of the first surface 16 a where one opening 30 a of the through hole 30 is formed. A first groove 40a having a rectangular outer shape in plan view from the insertion direction S is formed. The first surface 16 a constitutes a surface that can contact the LED substrate 20 when the fixing member 16 is fixed to the holding member 17 via the LED substrate 20.

  The outer shape of the first groove 40a is not limited to a rectangular shape, and may be any shape as long as it matches the outer shape of the light emitting element 21. In addition, the size of the outer shape of the first groove portion 40 a matches the size of the outer shape of the light emitting element 21. Thus, when the light emitting element 21 is inserted into the first groove portion 40a, the first groove portion 40a is positioned in the width direction W, the insertion direction S, and the height direction H orthogonal to the width direction W in the light emitting element 21. Is specified.

  In addition, after the light emitting element 21 is fitted into the first groove portion 40 a, the light emitting surface 21 m (see FIG. 9) of the light emitting element 21 is exposed to the second surface 16 b side described later through the through hole 30.

  In addition, a visual groove 41a that communicates with the first groove portion 40a is formed on the first surface 16a along a portion that extends downward from the approximate center in the width direction W of the fixing member 16 in the height direction H. ing.

  The first surface 16a and the LED substrate 20 are in contact with each other so that the light emitting element 21 is fitted into the first groove 40a. The fixing member 16 is fixed to the holding member 17 via the LED substrate 20. Further, a portion of the first light guide 50 a on the incident end face 50 i side is fixed to the through hole 30 of the fixing member 16. The visual groove 41a indicates whether the incident end surface 50i is in contact with the light emitting surface 21m of the light emitting element 21 when the portion on the incident end surface 50i side of the first light guide 50a is fixed to the through hole 30 of the fixing member 16. It is a groove for allowing an operator to visually recognize from below the fixing member 16.

  Further, in the first surface 16a, in the width direction W, the fixing member 16 is penetrated along the insertion direction S at a symmetrical position with the through hole interposed therebetween, and the fixing member 16 is held via the LED substrate 20 through the holding member. A screw hole 16h is formed through which a screw (not shown) to be fixed to 17 is inserted. In the present embodiment, the screw hole 16h is formed as an elongated long hole along the height direction H for the reason described later.

  Also, as shown in FIGS. 4 to 6, in the fixing member 16, approximately in the center in the width direction W on the second surface 16 b where the other opening 30 b opposite to the one opening 30 a of the through hole 30 is formed. A second groove portion 40b is formed which communicates with the through-hole 30 and has a rectangular outer shape in plan view from the insertion direction S in which the light emitting element 21 can be fitted. Note that the second surface 16 b constitutes a surface that can contact the LED substrate 20 when the fixing member 16 is fixed to the holding member 17 via the LED substrate 20.

  That is, when the fixing member 16 is fixed to the holding member 17 via the LED substrate 20, either the first surface 16a or the second surface 16b is selectively brought into contact with the LED substrate 20. In addition, the light-emitting element 21 is fitted into either the first groove portion 40a or the second groove portion 40b.

  The size of the outer shape of the second groove portion 40 b matches the size of the outer shape of the light emitting element 21. That is, the size of the outer shape of the second groove portion 40b coincides with the size of the outer shape of the first groove portion 40a.

  Thus, when the light emitting element 21 is inserted into the second groove portion 40b, the second groove portion 40b is positioned in the width direction W, the insertion direction S, and the height direction H orthogonal to the width direction W in the light emitting element 21. Is specified.

  In addition, after the light emitting element 21 is fitted into the second groove portion 40 b, the light emitting surface 21 m (see FIG. 9) of the light emitting element 21 is exposed to the first surface 16 a side through the through hole 30.

  Moreover, as shown by the rectangular dotted line in FIG. 7 and the rectangular solid line in FIG. 8, the second groove portion 40b is formed in the width direction W with respect to the first groove portion 40a with respect to the fixing member 16. Are coincident with each other, but in the height direction H, they are formed above the first groove 40a.

  In addition, a visual groove 41b that communicates with the second groove portion 40b is also formed on the second surface 16b along a portion that extends downward from the approximate center in the width direction W in the fixing member 16 in the height direction H. ing.

  The second surface 16b and the LED substrate 20 are in contact with each other so that the light emitting element 21 is fitted into the second groove portion 40b. The fixing member 16 is fixed to the holding member 17 via the LED substrate 20. Further, a portion on the incident end face 50i side of the second light guide 50b (see FIG. 8) having a diameter smaller than that of the first light guide 50a (see FIG. 7) is fixed to the through hole 30 of the fixing member 16. The visual groove 41b indicates whether the incident end surface 50i is in contact with the light emitting surface 21m of the light emitting element 21 when the portion on the incident end surface 50i side of the second light guide 50b is fixed to the through hole 30 of the fixing member 16. It is a groove | channel for making an operator visually recognize from the downward direction. In addition, as a diameter of the 2nd light guide 50b, 1.1 mm (when the diameter of the insertion part 2 is 4 mm in this Embodiment) is mentioned, for example.

  Also, as shown in FIGS. 4 to 6 and 8, a space 43 is formed in the fixing member 16 at a substantially central position in the width direction W so as to communicate with the through hole 30 and the second groove portion 40 b. ing.

  Furthermore, as shown in FIGS. 3, 5, and 6, in the fixing member 16, in the portion extending from the approximate center in the width direction W to the lower direction in the height direction H, the light guide 50 on the incident end face 50 i side is provided. The LG fixing screw 18 for fixing the part on the incident end face 50i side of the light guide 50 is inserted so that the part is supported in the through hole 30 at least three points in addition to the contact with the inner peripheral surface 30n of the through hole 30. In addition, an insertion hole 44 communicating with the space 43 is formed.

  The light guide 50 in the through hole 30 is fixed using the LG fixing screw 18. On the other hand, when the light guide 50 is the first light guide 50 a having the same diameter as the circular portion 33, the first light guide 50 a is fixed. The portion on the incident end face 50i side of the light guide 50a is inserted into the circular portion 33, and then a part of the outer peripheral surface is not in contact with the inner peripheral surface 30n by the triangular portion 34, as shown in FIG. With the other outer peripheral surface in contact with the inner peripheral surface 30 n of the circular portion 33, the through hole is inserted into the space 43 along the height direction H via the insertion hole 44, and the LG fixing screw 18 inserted into the through hole 30. 30 is fixed. As a result, the positions of the first light guide 50 a on the incident end face 50 i side in the through hole 30 are defined in the width direction W, the insertion direction S, and the height direction H.

  On the other hand, when the light guide 50 is the second light guide 50b having a smaller diameter than the first light guide 50a, the portion on the incident end face 50i side of the second light guide 50b is inserted through the through hole 30. 8 and 9, a part of the outer periphery is in contact with the inner peripheral surface 30n of the triangular portion 34 at two points, that is, a state in which the outer periphery is dropped into the V-shaped inner peripheral surface 30n. Thus, the LG fixing screw 18 inserted into the space 43 and the through-hole 30 along the height direction H through the insertion hole 44 causes a part of the outer periphery to be two points on the inner peripheral surface 30n of the triangular portion 34. And one point of the LG fixing screw 18 are fixed in the through hole 30 in a state where they are in contact with each other, that is, in a state where they are supported by the total three points. As a result, the positions of the first light guide 50 a on the incident end face 50 i side in the through hole 30 are defined in the width direction W, the insertion direction S, and the height direction H.

  Here, the through hole 30 is formed when the portion on the incident end face 50i side of the first light guide 50a is inserted into the through hole 30 in the fixing member 16 and the light emitting element 21 is inserted into the first groove portion 40a. 7, the center 21c of the light emitting surface 21m (see FIG. 9) of the light emitting element 21 and the axial center 50ac of the first light guide 50a coincide with each other, and the second light guide 50b is inserted into the through hole 30. When the portion on the incident end surface 50i side is inserted and the light emitting element 21 is inserted into the second groove 40b, as shown in FIGS. 8 and 9, the center 21c of the light emitting surface 21m and the second light guide 50b It is formed at a position where the shaft center 50bc coincides.

  In other words, the formation position of the through hole 30 is the formation position of the first groove portion 40a and the second groove portion 40b. In the first groove portion 40a, the light emitting element 21 is inserted into the first groove portion 40a, and the through hole 30 is further inserted. When the portion of the first light guide 50a on the incident end face 50i side is inserted, the light emitting element 21 is positioned at a position where the center 21c of the light emitting surface 21m coincides with the axial center 50ac of the first light guide 50a. At the same time, when the light emitting element 21 is inserted into the second groove 40b and the portion on the incident end face 50i side of the second light guide 50b is inserted into the through hole 30, the light emitting element 21 is inserted into the second groove 40b. Is positioned at a position where the center 21c of the light emitting surface 21m coincides with the axial center 50bc of the second light guide 50b.

  Therefore, contrary to the present embodiment, the light emitting element 21 is inserted into the second groove portion 40b even though the portion on the incident end face 50i side of the first light guide 50a is fixed to the through hole 30. As a result, the center 21c of the light emitting surface 21m and the axial center 50ac of the first light guide 50a are shifted in the height direction H. Similarly, if the light emitting element 21 is inserted into the first groove portion 40a even though the portion on the incident end face 50i side of the second light guide 50b is fixed to the through hole 30, the light emitting surface 21m The center 21c and the axial center 50bc of the second light guide 50b are shifted in the height direction H.

  Further, as described above, in the fixing member 16, the second groove portion 40 b is formed so as to be shifted upward from the first groove portion 40 a in the height direction H with respect to the first groove portion 40 a. 8, naturally, the center 21c of the light emitting surface 21m when the light emitting element 21 is fitted in the second groove 40b is the light emission when the light emitting element 21 is fitted in the first groove 40a. It is shifted upward in the height direction H from the center 21c of the surface 21m.

  That is, the attachment position of the fixing member 16 to the LED substrate 20 differs in the height direction H after the insertion, depending on whether the light emitting element 21 is inserted into either the first groove 40a or the second groove 40b. This is the reason why the above-described screw hole 16h is formed into a long and narrow hole along the height direction H.

  Further, in the fixing member 16, one end in the width direction W, specifically, as shown in FIG. 3, when looking at the first surface 16a, it is the right end in the width direction W, as shown in FIG. When the second surface 16b is viewed, an extension portion 16e extending downward in the height direction H is formed at the left end in the width direction W.

  On the other hand, when the light emitting element 21 is fitted into the first groove portion 40a and the first surface 16a is brought into contact with the LED substrate 20, the extending portion 16e is fixed to the LED substrate 20 as shown in FIG. The number “4” written on the 16 abutment surface is hidden. As a result, the number “6” is exposed.

  Thus, the operator can read the first light guide 50a having a diameter of 1.8 mm (when the diameter of the insertion portion is 6 mm in the present embodiment) in the through hole 30 from the readable number “6”. In the case of fixing, it can be easily recognized that the surface of the fixing member 16 in contact with the LED substrate 20 is the first surface 16a. In other words, it can be easily recognized that the surface of the fixing member 16 in contact with the LED substrate 20 is not the second surface 16b.

  On the other hand, when the light emitting element 21 is fitted into the second groove portion 40b and the second surface 16b is brought into contact with the LED substrate 20, the extension portion 16e is a fixing member of the LED substrate 20, as shown in FIG. The number “6” written on the 16 abutment surface is hidden. As a result, the number “4” is exposed.

  Thus, the operator can read the second light guide 50b having a diameter of 1.1 mm (when the diameter of the insertion portion is 4 mm in the present embodiment) in the through hole 30 from the readable number “4”. In the case of fixing, it can be easily recognized that the surface of the fixing member 16 in contact with the LED substrate 20 is the second surface 16b. In other words, it can be easily recognized that the surface of the fixing member 16 in contact with the LED substrate 20 is not the first surface 16a.

  The number described on the LED board 20 that allows the operator to recognize whether the first surface 16a or the second surface 16b of the fixing member 16 is in contact with the LED board 20 is "4", The number is not limited to “6” and may be any number according to the diameter of the insertion portion 2, and may be a character other than a number.

  Next, the operation of the present embodiment will be briefly described. Specifically, the fixing member 16 is fixed to the holding member 17 via the LED substrate 20, and after the light emitting element 21 is fitted into the fixing member 16, the light guide 50 is inserted into the through hole 30 of the fixing member 16. A method for fixing the site on the incident end face 50i side will be briefly described.

  First, when fixing the portion on the incident end surface 50i side of the first light guide 50a in the through hole 30, the first surface 16a of the fixing member 16 is brought into contact with the LED substrate 20, and light is emitted from the first groove portion 40a. The element 21 is inserted. As a result, as shown in FIG. 7, the axial center 50ac of the first light guide 50a coincides with the center 21c of the light emitting surface 21m of the light emitting element 21.

  Next, a screw (not shown) is inserted into the screw hole 16 h to fix the fixing member 16 to the holding member 17 through the LED substrate 20.

  Finally, after the part on the incident end face 50i side of the first light guide 50a is inserted into the through hole 30, as shown in FIG. 7, a part of the part on the incident end face 50i side of the first light guide 50a is inserted. In the state where the outer peripheral surface is not in contact with the inner peripheral surface 30n by the triangular portion 34, the other outer peripheral surface is in contact with the inner peripheral surface 30n of the circular portion 33 in the height direction H through the insertion hole 44. The first light guide 50 a is fixed in the through hole 30 by the LG fixing screw 18 inserted through the space 43 and the through hole 30.

  In this operation, the fixing member 16 may be fixed to the holding member 17 after fixing the portion on the incident end surface 50 i side of the first light guide 50 a in the through hole 30.

  Next, when fixing the site | part by the side of the incident end surface 50i of the 2nd light guide 50b in the through-hole 30, the 2nd surface 16b of the fixing member 16 is contact | abutted to the LED board 20, and the 2nd groove part 40b is made to contact | abut. The light emitting element 21 is inserted. As a result, as shown in FIG. 8, the axial center 50bc of the second light guide 50b and the center 21c of the light emitting surface 21m of the light emitting element 21 coincide.

  Next, a screw (not shown) is inserted into the screw hole 16 h to fix the fixing member 16 to the holding member 17 through the LED substrate 20.

  Finally, after the part on the incident end face 50i side of the second light guide 50b is inserted into the through hole 30, the part on the incident end face 50i side of the second light guide 50b as shown in FIGS. In a state where a part of the outer periphery of the inner surface 30n is in contact with the inner peripheral surface 30n of the triangular portion 34 at two points, that is, in a state where the outer periphery is dropped into the V-shaped inner peripheral surface 30n, the height is increased through the insertion hole 44. Due to the LG fixing screw 18 inserted through the space 43 and the through hole 30 along the length direction H, a part of the outer periphery has two points on the inner peripheral surface 30n of the triangular portion 34 and one point of the LG fixing screw 18. The second light guide 50b is fixed in the through-hole 30 in a state where it is in contact with the total three points, that is, in a state supported by the total three points.

  In this operation, the fixing member 16 may be fixed to the holding member 17 after fixing the portion of the second light guide 50 b on the incident end surface 50 i side in the through hole 30.

  As described above, in the present embodiment, when the portion on the incident end face 50i side of the second light guide 50b having a smaller diameter than the through diameter t of the through hole 30 is fixed in the through hole 30 of the fixing member 16, A portion of the second light guide 50b on the incident end face 50i side is partially in contact with the inner peripheral surface 30n of the triangular portion 34 at two points along the height direction H through the insertion hole 44. A state in which a part of the outer periphery is in contact with a total of three points including two points on the inner peripheral surface 30n of the triangular portion 34 and one point on the pin 18, by the pin 18 inserted into the space 43 and the through hole 30; That is, it is shown that the second light guide 50b is fixed in the through hole 30 while being supported by a total of three points.

  According to this, the second light guide 50b is firmly fixed at three points in the through-hole 30 instead of two points as in the prior art, so that vibration, impact, etc. are applied from the outside. In addition, the fixing position of the second light guide 50b in the through hole 30 is not shifted.

  Further, in the present embodiment, the through hole 30 is formed in the fixing member 16 so that the portion on the incident end face 50i side of the first light guide 50a is inserted through the through hole 30, and the light emitting element 21 is inserted into the first groove 40a. When inserted, the center 21c of the light emitting surface 21m of the light emitting element 21 and the axial center 50ac of the first light guide 50a coincide with each other and the second light guide 50b is inserted into the through hole 30 as shown in FIG. When the light emitting element 21 is inserted into the second groove portion 40b, the center 21c of the light emitting surface 21m and the second light guide 50b are inserted as shown in FIGS. It was shown that it was formed at a position that coincides with the axial center 50bc.

  According to this, the center 21c of the light emitting surface 21m of the light emitting element 21 and the through hole 30 can be obtained simply by bringing the first surface 16a into contact with the LED substrate 20 and inserting the light emitting element 21 into the first groove 40a. Since the axial center 50ac of the portion on the incident end face 50i side of the first light guide 50a inserted through the light guide 50a can be easily aligned with high accuracy without requiring a position adjusting mechanism or the like, the light is emitted from the light emitting surface 21m. The illumination light can be taken into the incident end face 50i of the first light guide 50a without waste.

  Moreover, the second surface 16b is brought into contact with the LED substrate 20 and the light emitting element 21 is inserted into the second groove portion 40b, and the light emitting surface 21m of the light emitting element 21 is inserted into the center 21c and the through hole 30. Further, the axial center 50bc of the second light guide 50a on the incident end face 50i side can be easily matched with high positional accuracy without the need for a position adjustment mechanism or the like, so that the illumination light emitted from the light emitting surface 21m can be matched. It can be taken into the incident end face 50i of the second light guide 50b without waste.

  That is, the operator makes the first surface 16 a contact with the LED substrate 20 and fits the light emitting element 21 into the first groove portion 40 a, or makes the second surface 16 b contact with the LED substrate 20. If the light emitting element 21 is inserted into the second groove portion 40b and the first surface 16a is brought into contact with the second groove portion 40b, the portion on the incident end surface 50i side of the first light guide 50a is formed in the through hole 30. When the second light guide 50b is fixed and brought into contact with the second surface 16b, the portion of the second light guide 50b on the incident end surface 50i side is fixed in the through hole 30 so that the first light guide 50 can be easily fixed. The axis center 50ac and the center 21c of the light emitting surface 21m can be matched, and the axis center 50bc of the second light guide 50 and the center 21c of the light emitting surface 21m can be matched.

  Furthermore, since it is only necessary to use one fixing member 16 to fix the two light guides 50 having different diameters, in other words, it is not necessary to prepare the two fixing members 16, thereby reducing the manufacturing cost. Can be reduced.

  As described above, the first light guide 50a having the same diameter as the through hole 30 of the fixing member 16 and the second light guide 50b having a smaller diameter than the first light guide 50a are selectively and easily light-emitted. Provided is an endoscope 1 having a configuration that can be firmly fixed in a through-hole 30 in a state where a center 21c of a light emitting surface 21m of an element 21 and axial centers 50ac and 50bc of light guides 50a and 50b are aligned. be able to.

  Hereinafter, modifications will be described.

  In the present embodiment described above, the first light guide 50a having a diameter of 1.8 mm when the diameter of the insertion portion is 6 mm, and the first light guide 50a having a diameter of 1.1 mm when the diameter of the insertion portion is 4 mm. The light guide 50b is fixed in the through hole 30. The axial centers 50ac and 50bc of the light guides 50a and 50b and the center 21c of the light emitting surface 21m of the light emitting element 21 are connected to the first light emitting element 21. It was shown that they can be made to coincide with each other only by being fitted into either the groove portion 40a or the second groove portion 40b.

  However, the diameter of the first light guide 50a is not limited to 1.8 mm when the diameter of the insertion portion is 6 mm, and the diameter of the second light guide is 1.1 mm when the diameter of the insertion portion is 4 mm. Of course, it is not limited to.

  That is, according to the diameter of the first light guide 50a, the diameter of the circular portion 33 of the through hole 30 and the formation position in the height direction H of the first groove portion 40a on the first surface 16a are changed to the first groove portion. The center 21c of the light emitting surface 21m of the light emitting element 21 inserted into 40a and the axial center 50ac of the first light guide 50a are changed so as to coincide with each other, and the second light guide 50b is changed according to the diameter of the second light guide 50b. The formation position in the height direction H of the second groove portion 40b on the surface 16b of the light emitting element 21 is set such that the center 21c of the light emitting surface 21m of the light emitting element 21 fitted in the second groove portion 40b and the axial center 50bc of the second light guide 50b. Of course, the present embodiment can be applied even if the first light guide 50a and the second light guide 50b have other diameters.

  Further, as described above, in the present embodiment, the fixing member 16 has shown that it is possible to fix the portion on the incident end face 50i side of the light guide 50 having two types of diameters with high positional accuracy. Not limited to this, it is also possible to fix the portion on the incident end face 50i side of the light guide 50 having three or more types of diameters with high positional accuracy.

  Specifically, a plurality of fixing members 16 are prepared, the through-diameter t of the first light guide 50a of the through hole 30, the formation position of the first groove portion 40a on the first surface 16a, and the second surface 16b. At least one of the positions where the second groove portions 40b are formed differs depending on the fixing member 16, and for each diameter of the first light guide 50a and the second light guide 50b inserted through the through hole 30, The fixing member 16 may be selectively used.

  According to this, if the fixing member 16 corresponding to the diameter of the light guide 50 is selected from among the plurality of fixing members 16 and used for fixing the portion on the incident end face 50i side of the light guide 50, the diameter of the light guide 50 is obtained. Regardless of this, since the axial center of the portion on the incident end face 50i side of the light guide 50 fixed in the through hole 30 can be made to coincide with the center 21c of the light emitting surface 21m of the light emitting element 21, there are three types. The light guide having the above diameter can be fixed with high positional accuracy.

  3 and 4, the through hole 30, the first groove 40a, and the second groove 40b are separated from the fixing member 16, and the through hole 30, the first groove The groove portion 40a and the second groove portion 40b are formed in a plurality of detachable members 90 that are detachably attachable to one fixing member 16, and the through-hole 30 has a through-diameter t of the first light guide 50a and the first surface 16a. At least one of the formation position of the first groove portion 40a and the formation position of the second groove portion 40b on the second surface 16b is made different for each detachable member 90, and the first light inserted through the through hole 30 Each detachable member 90 may be selectively used for each diameter of the guide 50a and the second light guide 50b.

  According to this, the detachable member 90 corresponding to the diameter of the light guide 50 is selected from the plurality of detachable members 90, and the through hole 30 formed in the detachable member 90 is positioned on the incident end face 50 i side of the light guide 50. If the light guide 50 is used for fixing, the axial center of the portion on the incident end face 50i side of the light guide 50 securely fixed in the through hole 30 and the center 21c of the light emitting surface 21m of the light emitting element 21 are used regardless of the diameter of the light guide 50. Therefore, the light guide having three or more types of diameters can be fixed with high positional accuracy.

  In the present embodiment, the portion on the incident end face 50 i side of the light guide 50 with respect to the light emitting element 21 is fixed in the connection portion 10. That is, the light emitting element 21 is shown as being provided in the connection portion 10.

  In addition to considering the center of gravity of the operation unit 3, it is desired to provide the light emitting element 21 in the vicinity of the exterior member from the viewpoint of heat generation, and the light guide 50 is supplied into the subject when the length of the light guide 50 becomes long. The amount of illumination light to be reduced decreases with light guiding from the incident end face 50i to the exit end face in the light guide 50, and it is desired to make it as short as possible. This is because it is necessary to provide the light emitting element 21 outside the operation unit 3 to prevent the light emitting element 21 from being formed, and there is no arrangement space for the light emitting element 21 in the insertion unit 2.

  However, if these are not taken into consideration, it goes without saying that the fixing structure of the portion on the incident end face 50i side of the light guide 50 using the fixing member 16 of the present embodiment may be applied to other than the connection portion 10. is there.

  Hereinafter, another modification will be described with reference to FIGS. FIG. 12 is a plan view of a fixing member showing a modification of the shape of the fixing member in FIG. 2, and FIG. 13 is a diagram showing a portion of the second light guide on the incident end face side of the through hole in FIG. FIG. 14 is a plan view schematically showing the fixed state together with the light-emitting surface of the light-emitting element. FIG. 14 is a diagram illustrating a portion on the incident end surface side of the first light guide fixed by an LG fixing screw in the through hole of FIG. It is a top view which shows a state schematically with the light emission surface of a light emitting element.

  In the present embodiment described above, the fixing member 16 is formed in an elongated shape along the width direction W orthogonal to the insertion direction S so that the shape in plan view from the insertion direction S has a substantially F shape in the lateral direction. Indicated.

  Not limited to this, as shown in FIG. 12, the fixing member 116 is formed in an elongated shape along the width direction W orthogonal to the insertion direction S so that the shape in plan view from the insertion direction S has a substantially T shape. It does not matter. That is, the extended portion 16e may not be provided.

  In the present embodiment, the light emitting element 21 can be selectively inserted into the first groove portion 40a formed on the first surface 16a and the second groove portion 40b formed on the second surface 16b. It was shown.

  Not limited to this, as shown in FIG. 12, the light emitting element 21 can be fitted only in the first groove 140 a formed on the first surface 116 a of the fixing member 116, that is, in the LED substrate 20, It may be configured such that only the first surface 116a can be contacted.

  On the other hand, the light emitting element 21 can be inserted only into a second groove (not shown) formed on the second surface (not shown) of the fixing member 116, that is, the LED substrate 20 has only the second surface. It may be configured to be freely contactable.

  In such a configuration, since the second surface or the first surface 116a of the fixing member 116 is not used, the screw hole 116h is long along the height direction H as in the present embodiment. There is no need to form holes.

  According to such a configuration, on the other hand, as shown in FIG. 14, when the light guide 50 is the first light guide 50a having the same diameter as the circular portion 33, the incident end face 50i of the first light guide 50a. After the part on the side is inserted into the circular part 33, a part of the outer peripheral surface is not in contact with the inner peripheral surface 30 n by the triangular part 34, and the other outer peripheral surface is on the inner peripheral surface 30 n of the circular part 33. In the contact state, it is fixed in the through-hole 30 by the LG fixing screw 18 inserted through the through-hole 30 in the space 43 along the height direction H through the through-hole 44. The axial center 50ac of the first light guide 50a and the center 21c of the light emitting surface 21m of the light emitting element 21 can be matched.

  However, on the other hand, as shown in FIG. 13, when the light guide 50 is the second light guide 50b having a smaller diameter than the first light guide 50a, the site on the incident end face 50i side of the second light guide 50b is After being inserted into the through-hole 30, a part of the outer periphery is in contact with the inner peripheral surface 30n of the triangular portion 34 at two points, that is, a state in which the outer periphery is dropped into the V-shaped inner peripheral surface 30n. Thus, the LG fixing screw 18 inserted into the space 43 and the through-hole 30 along the height direction H through the insertion hole 44 has a part of the outer periphery of two points of the triangular portion 34 and the LG fixing screw. 18 is fixed in the through hole 30 in a state where it is in contact with a total of three points, that is, in a state supported by the total of three points, but the center 21c of the light emitting surface 21m and the second light guide 50b are fixed. It doesn't match the axis center 50bc Cormorant.

  However, even in the fixed structure shown in FIG. 13, the second light guide 50b overlaps the incident end face 50i with the light emitting face 21m in a plan view, so that a certain amount of illumination light is incident on the incident end face 50i. Further, since the second light guide 50b is firmly fixed at three points in the through hole 30, even if vibration, impact, etc. are applied from the outside, the second light guide 50b in the through hole 30 An effect similar to that of the present embodiment in which the fixed position is not displaced can be obtained. Other effects are the same as those of the present embodiment described above.

  Hereinafter, another modification will be described with reference to FIG. FIG. 15 is a plan view schematically showing a state in which a light guide having a non-circular cross section in the through hole of FIGS. 3 and 12 is fixed by an LG fixing screw together with the light emitting surface of the light emitting element.

  In the present embodiment described above, the first light guide 50a and the second light guide 50b are shown to have a circular cross-sectional shape. However, as shown in FIG. Even the third light guide 50c having a circular shape can be firmly fixed with high positional accuracy, as in the above-described embodiment.

  Therefore, since it is not necessary to form the light guide 50 to have a circular cross section, the light guide 50 can be easily manufactured, and the manufacturing cost of the light guide 50 can be reduced.

  Other effects are the same as those of the present embodiment described above. This can also be applied to the fixing member 116 shown in FIGS.

  Hereinafter, another modification will be described with reference to FIGS. FIG. 16 is a plan view of a fixing member showing a modification in which the planar shape of the through hole in FIG. 12 is a square shape, together with a portion on the incident end face side of the first light guide, and FIG. 17 is a plan view of the through hole in FIG. FIG. 18 is a plan view of a fixing member showing a modification example in which the shape is made triangular, together with a part on the incident end face side of the first light guide. FIG. 18 is a combination of a square part and a planar part of the through hole in FIG. It is a top view of the fixing member which shows the modification made into the shape with the part by the side of the entrance end face of the 1st light guide.

  In the present embodiment described above, the planar shape of the through-hole 30 is formed in a teardrop shape when viewed in plan from the insertion direction S having a circular portion 33 and a triangular portion 34 communicating with the circular portion 33. It is shown that the fixing member 16 penetrates in the insertion direction S while maintaining the teardrop shape.

  The planar shape of the through hole 30 is not limited to this, and may be a polygonal shape that is equal to or larger than a quadrangle without a circular portion as shown in FIG. 16, or may be a triangular shape as shown in FIG. As shown in FIG. 18, a shape having a circular portion 33 and a rectangular portion 36 communicating with the circular portion 33 may be used.

  That is, as shown in FIG. 7, the part on the incident end face 50i side of the first light guide 50a is in a state where a part of the outer peripheral surface is not in contact with the inner peripheral surface 30n by the triangular part 34. Is fixed in the through hole 30 by the LG fixing screw 18 inserted into the space 43 and the through hole 30 along the height direction H through the insertion hole 44 in a state where the inner surface 30n of the circular portion 33 is in contact with the inner peripheral surface 30n. As shown in FIGS. 8 and 9, a part of the second light guide 50b on the incident end face 50i side is in a state in which a part of the outer periphery is in contact with the inner peripheral surface 30n of the triangular part 34 at two points. The LG fixing screws 18 inserted into the space 43 and the through-hole 30 along the height direction H through the insertion holes 44 are formed so that a part of the outer periphery has two points of the triangular portion 34 and the LG fixing screws 18. In contact with a total of 3 points, that is, a total of 3 points. Have a shape that can be fixed to the through hole 30 in a state, the planar shape of the through hole 30, may be any shape.

  Even in the planar shape of the through hole 30 shown in FIGS. 16 to 18, the first light guide 50 a and the second light guide 50 b are firmly fixed with high positional accuracy as in the above-described embodiment. Can be fixed. Other effects are the same as those of the present embodiment described above.

  In addition, as mentioned above, the shape of the through-hole 30 shown in FIGS. 16-18 is applicable to the through-hole formed in the fixing member 16 of this Embodiment, and the through-hole of the fixing member 116 shown in FIG.

  Hereinafter, another modification will be described with reference to FIGS. 19 and 20. FIG. 19 is a plan view of a fixing member showing a modification in which the planar shape of the through hole in FIG. 12 is a circular part plus a roof-like part together with a part on the incident end face side of the first light guide, and FIG. FIG. 20 is a partial cross-sectional view showing only the fixing member along the line IIX-IIX in FIG. 19 together with the LED substrate, the light emitting element, and the portion on the incident end face side of the first light guide.

  As shown in FIG. 19, the planar shape of the through hole 30 may be a shape having a circular portion 33 and a roof-like portion 37 that communicates with the circular portion 33.

  In addition, on the inner peripheral surface 30n of the roof-shaped part 37, as shown in FIGS. 19 and 20, a part of the outer peripheral surface of the part on the incident end face 50i side of the first light guide 50a or the second light guide 50b. There are provided four projections 37t1, 37t2, 37t3, 37t4 (37t4 not shown) that contact a part of the outer peripheral surface of the part on the incident end face 50i side.

  According to such a configuration, when the portion of the first light guide 50a on the incident end surface 50i side is fixed by the LG fixing screw 18, a part of the portion of the first light guide 50a on the incident end surface 50i side is fixed. In the state where the outer peripheral surface is not in contact with the inner peripheral surface 30n by the roof-shaped portion 37 and is in contact with the four protrusions 37t1, 37t2, 37t3, 37t4, the other outer peripheral surface is in contact with the inner peripheral surface 30n of the circular portion 33. In the state, it is fixed in the through hole 30 by the LG fixing screw 18 inserted into the space 43 and the through hole 30 along the height direction H through the insertion hole 44.

  In addition, when the portion on the incident end face 50i side of the second light guide 50b is fixed by the LG fixing screw 18, a part of the outer periphery is in contact with the four protrusions 37t1, 37t2, 37t3, and 37t4 at four points. In this state, the LG fixing screw 18 inserted into the space 43 and the through-hole 30 along the height direction H through the insertion hole 44 causes a part of the outer periphery to be the protrusions 37t1, 37t2, 37t3, and 37t4. It fixes in the through-hole 30 in the state which contacted the total 5 points | pieces of the point and 1 point of LG fixing screw 18, ie, the state supported by the total 5 points.

  Even in the planar shape of the through-hole 30 shown in FIGS. 19 and 20, the first light guide 50a and the second light guide 50b are firmly fixed with high positional accuracy as in the above-described embodiment. Can be fixed. Other effects are the same as those of the present embodiment described above.

The shape of the through hole 30 shown in FIGS. 19 and 20 is applicable to the through hole formed in the fixing member 16 of the present embodiment and the through hole of the fixing member 116 shown in FIG.
In the above-described embodiment, the diameter of the through hole 30 (circular portion 33) of the fixing member 16 is equal to the diameter of the first light guide 50a when the diameter of the insertion portion 2 is 6 mm. For example, as long as it is larger than the diameter of the second light guide 50b when the diameter of the insertion portion is 4 mm, it does not have to be exactly the same (substantially equal).

DESCRIPTION OF SYMBOLS 1 ... Endoscope 2 ... Insertion part 3 ... Operation part 10 ... Connection part 18 ... Light guide fixing screw (pressing member)
DESCRIPTION OF SYMBOLS 16 ... Light guide fixing member 16a ... 1st surface of a light guide fixing member 16b ... 2nd surface of a light guide fixing member 21 ... Light emitting element 21c ... Center of a light emission surface 30 ... Through-hole 30a ... One opening of a through-hole 30b: The other opening of the through hole 30n: The inner peripheral surface of the through hole 33 ... A circular part of the through hole 34 ... A triangular part of the through hole 40a ... First groove part 40b ... Second groove part 44 ... Insertion hole 50 ... Light Guide 50a ... first light guide 50ac ... first light guide axial center 50b ... second light guide 50bc ... second light guide axial center 50i ... light guide incident end surface 90 ... detachable member S ... insertion direction t ... Through diameter of the through hole

Claims (8)

An endoscope having an insertion portion to be inserted into a subject,
A light emitting element;
The incident end face is opposed to the light emitting element, and the illumination light emitted from the light emitting element and incident on the incident end face is emitted from the distal end in the insertion direction of the insertion portion into the subject. A light guide provided in at least the insertion portion that guides light to an end surface;
A light guide fixing member for fixing the incident end face side portion of the light guide;
And having
The light guide fixing member is
The inserted light guide has a through-hole supported on the inner peripheral surface at at least three points, and
A first groove formed in a first surface of the light guide fixing member in which one opening of the through-hole is formed and communicated with the through-hole, into which the light emitting element can be fitted;
A second groove that is formed on the second surface of the light guide fixing member in which the other opening of the through hole is formed and communicates with the through hole;
Comprising
When the first light guide having the same diameter as the through hole is inserted into the through hole, and the light emitting element is inserted into the first groove, the through hole has a light emitting surface center of the light emitting element. The second light guide having a smaller diameter than the first light guide is inserted into the through hole, and the light emitting element is inserted into the second groove. The endoscope is characterized in that when formed, the endoscope is formed at the position of the light guide fixing member where the center of the light emitting surface coincides with the axial center of the second light guide. When the light emitting element is inserted into the first groove and the first light guide is inserted through the through-hole, the first groove is configured so that the light emitting element is connected to the center of the light emitting surface and the center. Positioning the first light guide at the position where the axis center coincides,
When the light emitting element is inserted into the second groove and the second light guide is inserted into the through-hole, the second groove is configured so that the light emitting element is positioned at the center of the light emitting surface and the center. The endoscope according to claim 1, wherein the endoscope is positioned at a position where the axial center of the second light guide coincides. There are a plurality of light guide fixing members, and the light guide fixing member can be selected from a plurality, and the through diameter of the through hole, the formation position of the first groove on the first surface, and the second surface At least one of the formation position of the second groove portion differs depending on the light guide fixing member,
The light guide fixing member is selectively provided for each diameter of the first light guide and the second light guide inserted through the through hole. Endoscope. The through hole, the first groove portion, and the second groove portion are formed as a plurality of detachable members that are separate from the light guide fixing member and are detachable from the light guide fixing member.
At least one of the through-diameter of the through hole, the formation position of the first groove portion on the first surface after mounting, and the formation position of the second groove portion on the second surface is It depends on each detachable member,
3. The detachable member is selectively provided on the light guide fixing member for each diameter of the first light guide and the second light guide inserted through the through hole. The endoscope according to 1. An operation unit is connected to a proximal end of the insertion unit via a connection unit,
The endoscope according to any one of claims 1 to 4, wherein the light emitting element and the light guide fixing member are provided in the connection portion between the insertion portion and the operation portion.   The said through-hole is formed in the plane teardrop shape which has a circular site | part equal to the diameter of a said 1st light guide, and a triangular-shaped site | part connected to this circular site | part. The endoscope according to any one of the above. The through hole through which a pressing member for fixing the portion on the incident end face side of the light guide so that the portion is included in contact with the inner peripheral surface and supported in the through hole at at least three points is inserted. Further comprising an insertion hole communicating with the
The part on the incident end face side in the first light guide is another part in a state where a part is not in contact with the inner peripheral surface by the triangular part when inserted into the circular part of the through-hole. The endoscope according to claim 6, wherein the endoscope is fixed in the through-hole by the pressing member inserted through the insertion hole in a state where it is in contact with the inner peripheral surface of the circular part. The through hole through which a pressing member for fixing the portion on the incident end face side of the light guide so that the portion is included in contact with the inner peripheral surface and supported in the through hole at at least three points is inserted. Further comprising an insertion hole communicating with the
The part on the incident end face side in the second light guide is inserted through the through hole, and the part is in contact with the inner peripheral surface of the triangular part at two points. The endoscope according to claim 6, wherein the endoscope is fixed in the through hole in a state of being supported at three points by the pressing member inserted therethrough.

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