JP2017131383A - Endoscope imaging apparatus and endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope imaging apparatus and an endoscope which have the positioning accuracy and bonding strength enhanced with respect to a prism holder.SOLUTION: An imaging apparatus 20 of an endoscope 2 comprises: an imaging optical system 21 including a prism 31; an imaging element 22; a holder 23 retaining an imaging optical system; and a fixing member 24 securing the prism 31 to the holder. The holder is formed in a cylindrical shape of which inner peripheral surface is a cylindrical surface coaxial with the optical axis of a lens 30 of the imaging optical system, and has a fitting portion 55 into which is inserted a column body portion 43 with the incidence plane 40 of the prism as its bottom surface. The fixing member is supported by the fitting portion displaceably in a direction orthogonal to the center axis of the inner peripheral surface of the fitting portion, and has a contact plane 63 being parallel to the center axis of the inner peripheral surface of the fitting portion and contacting a lateral face 44 of the column body portion with a chord 40c as one side, the chord being contained in a contour of the incidence plane of the prism.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an endoscope imaging apparatus and an endoscope.

  As an imaging device mounted at the distal end portion of the insertion portion of the endoscope, an imaging device that includes a prism in the imaging optical system and photoelectrically converts light that has passed through the imaging optical system is disposed substantially parallel to the longitudinal axis of the insertion portion. There are known endoscope imaging devices (for example, see Patent Document 1 to Patent Document 3).

  In the endoscope imaging device described in each of Patent Document 1 and Patent Document 2, the prism is disposed outside the lens holding frame that stores the lens of the imaging optical system and the prism holding frame that holds the lens holding frame. The prism holding frame is joined to the end face on the emission side.

  In the endoscope imaging apparatus described in Patent Document 3, a lens holder that stores a lens of an imaging optical system and an imaging holder that holds the lens holder are each formed in a cylindrical shape, and a prism uses a cylindrical member. Is formed. The exit side end of the lens holder is inserted into the lens side opening of the imaging holder and is fitted to the imaging holder, and the incident side end of the prism is also inserted into the prism side opening of the imaging holder. It is fitted to the holder.

Japanese Patent Laid-Open No. 08-106055 International Publication No. 2011/092901 JP 2013-99477 A

  The diameter of the insertion portion of the endoscope is required to be reduced, and the imaging device mounted at the distal end of the insertion portion is also required to be reduced in size according to the reduction in the diameter of the insertion portion. In addition, it is difficult to ensure positioning accuracy and bonding strength between elements constituting the imaging device.

  In the endoscope imaging apparatus described in each of Patent Document 1 and Patent Document 2, there is a concern that the positioning accuracy of the prism bonded to the end face of the prism holding frame with respect to the prism holding frame may decrease with the downsizing of the imaging apparatus. Also, there is a concern that the bonding strength of the prism to the prism holding frame may be reduced due to the reduction in the area of the end face of the prism holding frame.

  In the endoscope imaging device described in Patent Document 3, when the prism is fitted to the imaging holder, the positioning accuracy of the prism with respect to the imaging holder and the positioning accuracy with respect to the lens optical axis of the lens holder held by the imaging holder are improved. The improvement can be expected, and the bonding strength of the prism to the imaging holder can also be improved.

  However, the prism made of the cylindrical member can rotate with respect to the imaging holder around the central axis. Therefore, in the endoscope imaging device described in Patent Document 3, for example, a concave portion extending in parallel with the central axis of the prism is formed on the outer peripheral surface of the prism, and a protrusion that engages with the concave portion is an inner peripheral surface of the imaging holder. The prism is prevented from rotating by engaging the concave portion of the prism and the protrusion of the imaging holder.

  However, the processing for forming the imaging holder in a cylindrical shape having a protruding portion on the inner peripheral surface has a relatively high processing difficulty level, and it becomes difficult to obtain a desired processing accuracy as the imaging device becomes smaller. Then, there is a problem in the fitting between the prism and the imaging holder, the positioning accuracy of the prism with respect to the imaging holder is lowered, and the positioning accuracy of the lens holder held by the imaging holder with respect to the lens optical axis may also be lowered.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an endoscope imaging device and an endoscope in which positioning accuracy and bonding strength with respect to a prism holder are increased.

  An endoscope imaging apparatus according to one embodiment of the present invention includes one or more lenses and a prism that receives light that has passed through the lens and emits the incident light in a direction different from the incident direction. An optical system; an imaging device that photoelectrically converts light emitted from the prism; a holder that holds the imaging optical system; and a fixing member that fixes the prism to the holder. The contour includes one or more arcs and one or more chords in the same circle, the prism has a column portion extending perpendicularly to the incident surface with the incident surface as a bottom surface, and the holder includes: The inner peripheral surface is formed in a cylindrical shape that is a cylindrical surface coaxial with the optical axis of the lens, and has a fitting portion into which at least a part of the column body portion of the prism is inserted. Orthogonal to the central axis of the inner peripheral surface of the fitting part It is supported by the fitting part so as to be displaceable in the direction, and is a plane parallel to the central axis of the inner peripheral surface of the fitting part, and the chord included in the outline of the incident surface of the prism is defined as one side. A contact surface that contacts the side surface of the column body portion;

  An endoscope according to one embodiment of the present invention includes the above-described endoscope imaging device at a distal end portion of an insertion portion.

  ADVANTAGE OF THE INVENTION According to this invention, the imaging device for endoscopes and endoscope which improved the positioning precision with respect to the holder of a prism, and joining strength can be provided.

It is a lineblock diagram of an example of an endoscope system for explaining an embodiment of the present invention. It is a perspective view of the imaging device for endoscopes mounted in the front-end | tip part of the insertion part of the endoscope of FIG. It is sectional drawing of the imaging device for endoscopes of FIG. It is a perspective view of the prism of the imaging device for endoscopes of FIG. It is a front view of the prism of FIG. It is a side view of the prism of FIG. It is a perspective view of the holder of the imaging device for endoscopes of FIG. It is sectional drawing of the holder of FIG. It is a schematic diagram which shows the function of the fixing member of the imaging device for endoscopes of FIG. It is a perspective view of the other example of a prism. It is a side view of the prism of FIG.

  FIG. 1 shows an example of an endoscope system for explaining an embodiment of the present invention.

  The endoscope system 1 includes an endoscope 2, a light source unit 3, and a processor unit 4. The endoscope 2 includes an insertion portion 6 that is inserted into a subject, an operation portion 7 that is continuous with the insertion portion 6, and a universal cord 8 that extends from the operation portion 7. The bending portion 11 is connected to the distal end portion 10, and the flexible portion 12 connects the bending portion 11 and the operation portion 7.

  The distal end portion 10 is provided with an illumination optical system that emits illumination light for illuminating an observation site, an imaging optical system, and an imaging device that includes an imaging element. The bending portion 11 is configured to be able to bend in a direction orthogonal to the longitudinal axis of the insertion portion 6, and the bending operation of the bending portion 11 is operated by the operation portion 7. Further, the flexible portion 12 is configured to be relatively flexible so as to be deformable following the shape of the insertion path of the insertion portion 6.

  The operation unit 7 is provided with a button for operating the imaging operation of the imaging device mounted on the distal end unit 10 and a rotary knob for operating the bending operation of the bending unit 11. The operation section 7 is also provided with a treatment instrument insertion port 13 into which a treatment instrument such as an electric knife is inserted, and a treatment instrument channel 14 through which the treatment instrument is inserted is disposed inside the insertion section 6. It is provided from the insertion port 13 to the distal end portion 10.

  A light guide and an electric wire group are provided inside the insertion portion 6, the operation portion 7 and the universal cord 8, and a connector 9 is provided at the end of the universal cord 8. The endoscope 2 is connected to the light source unit 3 and the processor unit 4 via a connector 9.

  The illumination light generated by the light source unit 3 is guided to the illumination optical system of the tip 10 via the light guide and emitted from the illumination optical system. Moreover, the electric power of the imaging device of the front-end | tip part 10 and the video signal output from an imaging device are transmitted between the processor unit 4 and an imaging device via the said electric wire group. The processor unit 4 processes the input video signal to generate video data of the observation site, and displays and records the generated video data on the monitor 5.

  2 and 3 show the configuration of the imaging device mounted on the distal end portion 10 of the insertion portion 6.

  The imaging device 20 mounted on the distal end portion 10 includes an imaging optical system 21, an imaging element 22, a holder 23, and a fixing member 24.

  The imaging optical system 21 includes one or more lenses 30 and a prism 31.

  The optical axes of the lenses 30 are aligned with each other, and the optical axis of the lens 30 is arranged in parallel with the longitudinal axis of the insertion portion 6 in a state where the imaging device 20 is mounted on the distal end portion 10 of the insertion portion 6.

  The prism 31 includes an incident surface 40 on which light that has passed through the lens 30 is incident, a reflecting surface 41 that reflects light incident on the incident surface 40 in a direction different from the incident direction on the incident surface 40, and is reflected by the reflecting surface 41. And an emission surface 42 for emitting the emitted light.

  The incident surface 40 is disposed perpendicular to the optical axis of the lens 30, and the reflecting surface 41 is disposed to be inclined with respect to the optical axis. In the illustrated example, the incident surface 40 is inclined at an angle of 45 °. The light incident on the incident surface 40 along the optical axis of the lens 30 is reflected by the reflecting surface 41 in a direction orthogonal to the optical axis. The exit surface 42 is disposed perpendicular to the traveling direction of the light incident on the entrance surface 40 and reflected by the reflecting surface 41 along the optical axis of the lens 30. In the illustrated example, the optical surface of the lens 30 is disposed. Are arranged in parallel.

  The reflection surface 41 only needs to be inclined with respect to the optical axis of the lens 30, and the inclination angle of the reflection surface 41 with respect to the optical axis is not limited to 45 °. The exit surface 42 can also be appropriately set according to the inclination angle of the reflecting surface 41 with respect to the optical axis, and is not limited to one parallel to the optical axis.

  The imaging element 22 is, for example, a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor. The image receiving surface of the image pickup device 22 is bonded to the emission surface 42 of the prism 31 via an adhesive, and is arranged in parallel with the optical axis of the lens 30 in the same manner as the emission surface 42. The image sensor 22 photoelectrically converts light emitted from the emission surface 42 of the prism 31 to generate a video signal.

  The holder 23 includes a lens barrel 50 that holds the lens 30 of the imaging optical system 21, and a holding frame 51 that holds the lens barrel 50 and the prism 31.

  The lens barrel 50 is a cylindrical member, and the lens 30 is housed inside the lens barrel 50 with the optical axes of the lenses 30 aligned with each other. The exit side end 52 of the lens barrel 50 is formed in a cylindrical shape coaxial with the optical axis of the lens 30.

  The holding frame 51 includes a lens barrel holding portion 53 that holds the lens barrel 50 and a prism holding portion 54 that holds the prism 31.

  The lens barrel holding portion 53 is formed in a cylindrical shape whose inner peripheral surface is a cylindrical surface, and the emission side end portion 52 of the lens barrel 50 is inserted therein. The lens barrel 50 in which the emission side end portion 52 is inserted into the lens barrel holding portion 53 is held by the holding frame 51 so as to be movable along the optical axis of the lens 30.

  The prism holding unit 54 is provided adjacent to the lens barrel holding unit 53 in the axial direction of the lens barrel holding unit 53, and the prism 31 has the incident surface 40 directed toward the lens barrel holding unit 53, and the prism holding unit 54. Is held in.

  By moving the lens barrel 50 along the optical axis of the lens 30, the position of the lens 30 with respect to the imaging element 22 bonded to the prism 31 held by the prism holding unit 54 and the emission surface 42 of the prism 31 is adjusted. The After the lens 30 is positioned, the lens barrel 50 is fixed to the holding frame 51 with an adhesive or the like, for example.

  In this example, the holder 23 is configured by two members, a lens barrel 50 that holds the lens 30 and a holding frame 51 that holds the lens barrel 50 and the prism 31, but the lens barrel 50 and the holding frame 51 are configured. The holder 23 can also be constituted by a single member formed integrally.

  The fixing member 24 is provided in the prism holding portion 54 of the holding frame 51, and fixes the prism 31 held in the prism holding portion 54 to the holding frame 51.

  4 to 6 show the configuration of the prism 31. FIG.

  The outline of the incident surface 40 of the prism 31 is composed of two arcs 40a and 40b in the same circle, and two strings 40c and 40d that are parallel to each other and connect the end points of the arcs 40a and 40b.

  The prism 31 extends along a plane in which the end opposite to the end on the incident surface 40 side in the column extending perpendicularly to the incident surface 40 with the incident surface 40 as the bottom is oblique to the axis of the column. The reflective film made of, for example, aluminum is formed on the inclined surface, and this inclined surface is used as the reflective surface 41.

  The end of the prism 31 on the incident surface 40 side is a columnar portion 43 that extends perpendicularly to the incident surface 40 with the incident surface 40 as a bottom surface, and the side surface of the columnar portion 43 has an outline of the incident surface 40. Each of the included arcs 40a and 40b is formed of two curved surfaces, a plane 44 having one string 40c as one side, and a plane having the other string 40d as one side. A plane with one side of the string 40d extends in the axial direction beyond the column portion 43, and forms one side surface of the prism 31.

  In the illustrated example, the reflecting surface 41 is parallel to the strings 40c and 40d, the plane with the string 40d as one side faces the reflecting surface 41, and the plane with the string 40d as one side is the emission surface 42. ing. Since the string 40c and the string 40d are parallel to each other, the plane 44 having the string 40c as one side and the emission surface 42, which is a plane having the string 40d as one side, are also parallel to each other.

  Such a prism 31 can be produced, for example, by subjecting a cylindrical prism material to surface polishing or laser cutting to form each plane (reflection surface 41, emission surface 42, plane 44).

  7 and 8 show the configuration of the holding frame 51. FIG.

  As described above, the exit side end portion 52 of the lens barrel 50 is formed in a cylindrical shape coaxial with the optical axis of the lens 30, and the lens barrel holding portion 53 of the holding frame 51 that holds the lens barrel 50 has an inner peripheral surface. Is formed in a cylindrical shape having a cylindrical surface, and the emission side end portion 52 of the lens barrel 50 is inserted.

  The prism holding portion 54 of the holding frame 51 has a fitting portion 55 into which at least a part of the column body portion 43 of the prism 31 is inserted. The fitting portion 55 is formed in a cylindrical shape whose inner peripheral surface is a cylindrical surface coaxial with the lens barrel holding portion 53.

  In a state in which the column body portion 43 of the prism 31 is inserted into the fitting portion 55, a curved surface 45 having an arc 40a as one side and a curved surface 46 having an arc 40b as one side that respectively form the side surfaces of the column body portion 43. These are aligned with the inner peripheral surface of the fitting portion 55. Thereby, the prism 31 is positioned with respect to the optical axis of the lens 30 of the lens barrel 50 in which the emission side end portion 52 is inserted into the lens barrel holding portion 53 except for the rotation around the optical axis. Then, the rotation of the prism 31 around the optical axis is blocked by the fixing member 24 provided in the prism holding portion 54.

  The fixing member 24 is supported by the fitting portion 55 so as to be displaceable in a direction orthogonal to the central axis of the inner peripheral surface of the fitting portion 55. In the illustrated example, the fixing member 24 is a bolt, and the fitting portion 55 is provided with a screw hole 60 through which the fixing member 24 is inserted. The male screw portion 61 and the screw hole 60 on the outer peripheral surface of the fixing member 24 are provided. The fixing member 24 is supported by the fitting portion 55 so as to be displaceable in a direction orthogonal to the central axis of the inner circumferential surface of the fitting portion 55 by screwing the female screw portion 62 on the inner circumferential surface. The fixing member 24 may be a positioning pin instead of a bolt. When the fixing member 24 is a positioning pin, the fitting portion 55 is provided with a fitting hole instead of the screw hole 60.

  A contact surface 63 that is a plane parallel to the central axis of the inner peripheral surface of the fitting portion 55 is provided at the tip of the fixing member 24 that is directed to the central axis of the inner peripheral surface of the fitting portion 55. Yes. In the illustrated example, the contact surface 63 is perpendicular to the displacement direction of the fixing member 24, but as long as the contact surface 63 is parallel to the central axis of the inner peripheral surface of the fitting portion 55, the contact surface 63. May be inclined with respect to the displacement direction of the fixing member 24.

  FIG. 9 shows the function of the fixing member 24.

  The contact surface 63 of the fixing member 24 and the flat surface 44 of the column part 43 of the prism 31 are opposed to each other, and the fixing member 24 is directed toward the central axis of the inner peripheral surface of the fitting portion 55, that is, the column part. With the displacement toward the central axis 43, the contact surface 63 of the fixing member 24 contacts the flat surface 44 of the columnar portion 43.

  When the flat surface 44 of the column body portion 43 is inclined with respect to the displacement direction of the fixing member 24, the prism 31 is rotated by the flat surface 44 being pressed by the contact surface 63, and the flat surface 44 becomes the contact surface 63. Are arranged in parallel. The prism 31 is fixed to the holding frame 51 by the fixing member 24 while the plane 44 is arranged in parallel with the contact surface 63, and the rotation of the prism 31 around the optical axis is prevented.

  After the prism 31 is fixed to the holding frame 51 by the fixing member 24, the side surface of the column body portion 43 of the prism 31 and the inner peripheral surface of the fitting portion 55 of the holding frame 51 may be bonded. For example, there are gaps between the inner peripheral surface of the fitting portion 55 and the flat surface 44 and the emission surface 42 of the column body portion 43. If these gaps are filled with an adhesive, a small size can be obtained. Even in the imaging apparatus, a sufficient amount of adhesive can be interposed between the side surface of the column portion 43 and the inner peripheral surface of the fitting portion 55 of the holding frame 51.

  It is preferable that the plane 44 of the columnar portion 43 of the prism 31 pressed by the fixing member 24 and the emission surface 42 of the prism 31 to which the imaging element 22 is joined are parallel to each other as in the illustrated example. The imaging element 22 is positioned with respect to the holding frame 51 and the lens 30 of the lens barrel 50 held by the holding frame 51 via the prism 31, and the prism 31 uses the flat surface 44 of the columnar portion 43 as described above. Thus, the holding frame 51 is positioned. If the plane 44 and the emission surface 42 to which the image sensor 22 is joined are parallel to each other, the management of the positioning of the image sensor 22 is facilitated.

  The imaging element 22 may be bonded in advance to the emission surface 42 of the prism 31 before the prism 31 is fixed to the holding frame 51 by the fixing member 24. In this case, it is easy to manage the thickness of the adhesive interposed between the image receiving surface of the image sensor 22 and the output surface 42 and the parallelism between the image receiving surface of the image sensor 22 and the output surface 42.

  The imaging element 22 may be joined to the emission surface 42 of the prism 31 after the prism 31 is fixed to the holding frame 51 by the fixing member 24. In this case, the prism 31 can be handled by holding the holding frame 51 and the lens barrel 50 held by the holding frame 51, and the prism 31 can be handled more easily than the prism 31 alone.

  As described above, according to the imaging device 20 described above, the column body portion 43 of the prism 31 is inserted into the fitting portion 55 of the holding frame 51, and the arc 40 a that forms the side surface of the column body portion 43 is defined as one side. Since the curved surface 45 having the curved surface 45 and the arc 40b as one side is aligned with the inner peripheral surface of the fitting portion 55, only the incident surface 40 forming the bottom surface of the columnar portion 43 is the end surface of the holding frame 51. Compared to the case where the prism 31 is bonded, the bonding strength of the prism 31 to the holding frame 51 can be increased.

  And since the internal peripheral surface of the fitting part 55 is a pure cylindrical surface without a protrusion part and a recessed part, the fitting part 55 can be formed with high precision by simple hole processing. Thereby, the positioning accuracy of the prism 31 with respect to the holding frame 51 can be improved, and as a result, the positioning accuracy of the lens barrel 50 held by the holding frame 51 with respect to the optical axis can be increased.

  Up to this point, it has been described that the incident surface 40 of the prism 31 is composed of two arcs 40a and 40b and two strings 40c and 40d parallel to each other. A plane including one or more arcs and one or more chords in a circle and having the incident surface 40 as a bottom surface and extending perpendicularly to the incident surface 40 on a side surface of the column portion 43 is formed on one side of the string. That's fine.

  For example, in the modification of the prism 31 shown in FIGS. 10 and 11, the outline of the incident surface 40 is configured by one arc 40 e and one chord 40 f, and the incident surface 40 is a bottom surface and is perpendicular to the incident surface 40. A flat surface 44 with one side of the string 40f is formed on the side surface of the extending column portion 43. The reflection surface 41 and the emission surface 42 are appropriately formed in the end portion on the side opposite to the incident surface 40 and excluding the column body portion 43.

  By inserting the column portion 43 into the fitting portion 55 of the holding frame 51, the prism 31 of this modification example rotates around the optical axis with respect to the optical axis of the lens 30 of the lens barrel 50. Positioning is performed, and the flat surface 44 of the columnar portion 43 is pressed by the contact surface 63 of the fixing member 24, thereby preventing rotation around the optical axis.

  As described above, the endoscope imaging apparatus disclosed in the present specification is incident on one or more lenses and light that has passed through the lenses, and emits the incident light in a direction different from the incident direction. An imaging optical system having a prism, an imaging element that photoelectrically converts light emitted from the prism, a holder that holds the imaging optical system, and a fixing member that fixes the prism to the holder. The outline of the incident surface of the prism includes one or more arcs and one or more chords in the same circle, and the prism has a column body portion extending perpendicularly to the incident surface with the incident surface as a bottom surface. The holder is formed in a cylindrical shape whose inner peripheral surface is a cylindrical surface coaxial with the optical axis of the lens, and has a fitting portion into which at least a part of the column body portion of the prism is inserted. The fixing member is The fitting portion is supported by the fitting portion so as to be displaceable in a direction orthogonal to the central axis of the peripheral surface, and is a plane parallel to the central axis of the inner peripheral surface of the fitting portion, and the contour of the incident surface of the prism It has a contact surface that contacts the side surface of the column portion with the included string as one side.

  In the endoscope imaging device disclosed in the present specification, the emission surface of the prism is parallel to the side surface of the column body portion of the prism with which the fixing member abuts.

  Further, in the endoscope imaging device disclosed in the present specification, the outline of the incident surface of the prism is composed of two arcs in the same circle and two strings parallel to each other that connect the end points of the arcs, The prism includes a column that extends perpendicularly to the incident surface with the incident surface as a bottom surface, and an end opposite to the incident surface intersects the axis of the column and is included in the contour of the incident surface. It is formed in a shape that is removed along a plane parallel to the strings, and the side surface of the prism with one of the strings included in the outline of the incident surface as the side is the emission surface.

  Further, in the endoscope imaging device disclosed in the present specification, the fixing member and the fitting portion of the holder are each formed with a screw portion, and the fixing member is screwed by the screw portion. The fitting portion is supported by the fitting portion so as to be displaceable in a direction orthogonal to the central axis of the inner peripheral surface of the fitting portion.

  In the endoscope imaging device disclosed in this specification, the side surface of the column body portion of the prism and the inner peripheral surface of the fitting portion are bonded.

  Further, the endoscope disclosed in the present specification includes the above-described endoscope imaging device at the distal end portion of the insertion portion.

DESCRIPTION OF SYMBOLS 1 Endoscope system 2 Endoscope 3 Light source unit 4 Processor unit 5 Monitor 6 Insertion part 7 Operation part 8 Universal cord 9 Connector 10 Tip part 11 Bending part 12 Flexible part 13 Treatment tool insertion port 14 Treatment tool channel 20 Imaging device 21 Imaging optical system 22 Imaging element 23 Holder 24 Fixing member 30 Lens 30 Lens 31 Prism 40 Incident surface 40a Arc 40b Arc 40c String 40d String 40e Arc 40f String 41 Reflecting surface 42 Output surface 43 Column body portion 44 Side surface 45 of the column body portion Curved surface 46 curved surface 50 lens barrel 51 holding frame 52 exit side end portion 53 lens barrel holding portion 54 prism holding portion 55 fitting portion 60 screw hole 61 male screw portion 62 female screw portion 63 contact surface

Claims (6)

An imaging optical system having one or more lenses, and a prism on which light that has passed through the lens is incident and that emits the incident light in a direction different from the incident direction;
An image sensor that photoelectrically converts light emitted from the prism;
A holder for holding the imaging optical system;
A fixing member for fixing the prism to the holder;
With
The incident surface profile of the prism includes one or more arcs and one or more strings in the same circle,
The prism has a column part extending perpendicularly to the incident surface with the incident surface as a bottom surface,
The holder is formed in a cylindrical shape whose inner peripheral surface is a cylindrical surface coaxial with the optical axis of the lens, and has a fitting portion into which at least a part of the column body portion of the prism is inserted,
The fixing member is supported by the fitting portion so as to be displaceable in a direction orthogonal to the central axis of the inner peripheral surface of the fitting portion, and is a plane parallel to the central axis of the inner peripheral surface of the fitting portion. An endoscope imaging apparatus having an abutting surface that abuts on a side surface of the column body portion with one side of the string included in an outline of the incident surface of the prism. The endoscope imaging apparatus according to claim 1,
An imaging device for an endoscope, wherein an emission surface of the prism is parallel to the side surface of the column portion of the prism with which the fixing member abuts. An endoscope imaging apparatus according to claim 2,
The outline of the incident surface of the prism consists of two arcs in the same circle and two parallel strings connecting the end points of each arc,
The prism includes a column that extends perpendicularly to the incident surface with the incident surface as a bottom surface, and an end opposite to the incident surface is oblique to the axis of the column and is included in the contour of the incident surface. Formed in a shape removed along a plane parallel to the chord,
An imaging apparatus for an endoscope, wherein a side surface of the prism having one side of one of the strings included in the outline of the incident surface is the emission surface. An endoscope imaging apparatus according to any one of claims 1 to 3,
The fixing member and the fitting portion of the holder are respectively formed with screw portions, and the fixing member is brought into a direction perpendicular to the central axis of the inner peripheral surface of the fitting portion by screwing of the screw portions. An endoscope imaging device supported by the fitting portion so as to be displaceable. An endoscope imaging apparatus according to any one of claims 1 to 4,
An imaging apparatus for an endoscope, wherein a side surface of the column body portion of the prism and an inner peripheral surface of the fitting portion are bonded.   An endoscope comprising the endoscope imaging device according to any one of claims 1 to 5 at a distal end portion of an insertion portion.

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