Camera head and endoscope

Abstract

A camera head includes a mounting unit detachably connected to an eyepiece unit of an endoscope, the camera head capturing an object image emitted from the eyepiece unit. The eyepiece unit includes an abutting surface that is orthogonal to a central axis along an insertion direction of the endoscope into a subject, and the abutting surface extending over an entire circumference in a circumferential direction around the central axis. The mounting unit is connected to the eyepiece unit and is configured to relatively rotate the endoscope and the camera head around the central axis. The mounting unit includes a facing surface that faces the abutting surface, and a pressing portion that abuts the eyepiece unit and presses the eyepiece unit toward the facing surface along the central axis. The facing surface includes a projecting portion that projects toward the abutting surface and abuts the abutting surface.

What is claimed is: 
     
         1 . A camera head comprising a mounting unit which is detachably connected to an eyepiece unit of an endoscope, the camera head capturing an object image emitted from the eyepiece unit, wherein
 the eyepiece unit includes an abutting surface that is orthogonal to a central axis of the endoscope, the central axis being along an insertion direction of the endoscope into a subject, and the abutting surface extending over an entire circumference in a circumferential direction around the central axis,   the mounting unit is connected to the eyepiece unit and is configured to relatively rotate the endoscope and the camera head around the central axis,   the mounting unit includes
 a facing surface that faces the abutting surface, and 
 a pressing portion that abuts the eyepiece unit and presses the eyepiece unit toward the facing surface along the central axis, and 
   the facing surface includes a projecting portion that projects toward the abutting surface and abuts the abutting surface.   
     
     
         2 . The camera head according to  claim 1 , wherein the projecting portion has an annular shape extending over the entire circumference in the circumferential direction around the central axis. 
     
     
         3 . The camera head according to  claim 1 , wherein the facing surface includes at least three of the projecting portions. 
     
     
         4 . The camera head according to  claim 3 , wherein the projecting portions are each provided at rotationally symmetrical positions around the central axis. 
     
     
         5 . The camera head according to  claim 3 , wherein each of the projecting portions is a ball of which a part projects from the facing surface toward the abutting surface and is rotatably attached to the mounting unit. 
     
     
         6 . The camera head according to  claim 1 , wherein the projecting portions have a curved surface that has an arc shape in cross-sectional view and abuts the abutting surface. 
     
     
         7 . The camera head according to  claim 1 , wherein the projecting portions have a flat surface that abuts the abutting surface. 
     
     
         8 . The camera head according to  claim 1 , wherein the mounting unit includes at least three of the pressing portions. 
     
     
         9 . The camera head according to  claim 8 , wherein the pressing portions are provided at rotationally symmetrical positions around the central axis. 
     
     
         10 . The camera head according to  claim 8 , wherein
 the projecting portions are provided at at least three positions on a first virtual circle around the central axis,   the eyepiece unit is provided with an inclined surface that is separated from the central axis toward a side of the facing surface,   the pressing portions each abut the inclined surface and each press the eyepiece unit toward the facing surface along the central axis,   abutting positions between the pressing portions and the inclined surface are each positioned on a second virtual circle around the central axis, and   the first virtual circle is positioned at a position matching the second virtual circle or on an outer side from the second virtual circle when viewed from a direction along the central axis.   
     
     
         11 . The camera head according to  claim 8 , wherein
 the projecting portions are provided on the first virtual circle around the central axis by same number as that of the pressing portions and each are provided at rotationally symmetrical positions around the central axis,   the eyepiece unit is provided with the inclined surface that is separated from the central axis toward the side of the facing surface,   the pressing portions each abut the inclined surface and each press the eyepiece unit toward the facing surface along the central axis, and   abutting positions between the pressing portions and the inclined surface are each positioned at positions identical to positions of the projecting portions in a rotation direction around the central axis when viewed from a direction along the central axis or at positions at which angles in the rotation direction between adjacent projecting portions in the rotation direction are identical to each other.   
     
     
         12 . An endoscope comprising an eyepiece unit which is detachably connected to a mounting unit of a camera head, the endoscope taking an object image of an inside of a subject and emitting the image from the eyepiece unit, wherein
 the mounting unit includes
 a facing surface that is orthogonal to a central axis of the endoscope, the central axis being along an insertion direction of the endoscope into the subject, and the facing surface extending over an entire circumference in a circumferential direction around the central axis, and 
 a pressing portion that abuts the eyepiece unit and presses the eyepiece unit toward the facing surface along the central axis, and 
   the eyepiece unit is connected to the mounting unit and is configured to relatively rotate the endoscope and the camera head around the central axis,   the eyepiece unit includes an abutting surface that faces the facing surface, and   the abutting surface includes a projecting portion that projects toward the facing surface and abuts the facing surface.