Inner surface shape measurement device, detection head, and endoscope device

Abstract

An inner surface shape measurement device for measuring a shape of an inner surface of a test target, and includes a light source, an optical system which converts light emitted by the light source into a disc-shaped light beam to cause the light beam to be emitted toward an inner surface of the test target, a photography unit which captures an image of a state in which the light beam is projected on the inner surface of the test target, and a wiring which supplies power for driving the light source. The optical system, the light source and the photography unit are disposed in this order along a same axis line, and the wiring extends from the light source toward the photography unit.

What is claimed is: 
     
         1 . An inner surface shape measurement device for measuring a shape of an inner surface of a test target, the inner surface shape measurement device comprising:
 a light source;   an optical system which converts light emitted by the light source into a disc-shaped light beam to cause the light beam to be emitted toward the inner surface;   a photography unit which captures an image of a state in which the light beam is projected on the inner surface; and   a wiring which supplies power for driving the light source,   wherein the optical system, the light source and the photography unit are disposed in this order along a same axis line, and   the wiring extends from the light source toward the photography unit.   
     
     
         2 . The inner surface shape measurement device according to  claim 1 ,
 wherein the photography unit includes an objective optical system whose focal point distance is greater than a distance between the light source and the photography unit.   
     
     
         3 . The inner surface shape measurement device according to  claim 1 ,
 wherein the wiring extends from the light source toward the photography unit along the axis line, and is bent in a direction intersecting the axis line at a position apart from the photography unit by a predetermined distance.   
     
     
         4 . The inner surface shape measurement device according to  claim 1 , further comprising:
 a cylindrical member including a photography-unit-side opening disposed at a position apart from the photography unit by a predetermined distance and a light-source-side opening opened to the light source, the cylindrical member has a central axis line extending along the axis line between the light source and the photography unit,   wherein the wiring is inserted into the cylindrical member.   
     
     
         5 . The inner surface shape measurement device according to  claim 1 ,
 wherein the wiring of at least positioned in a range of a view field of the photography unit has optical transparency.   
     
     
         6 . The inner surface shape measurement device according to  claim 1 , further comprising an insertion portion inserted into the test target,
 wherein the insertion portion includes   a main body formed in a cylindrical shape; and   a detection head formed in a container-shape in which the axis line is located therein, the detection head detachably provided at an end portion of the main body, and   the optical system and the light source are disposed inside the detection head.   
     
     
         7 . The inner surface shape measurement device according to  claim 6 ,
 wherein the photography unit includes an objective optical system, and   at least a portion of optical elements constituting the objective optical system is disposed inside the detection head.   
     
     
         8 . The inner surface shape measurement device according to  claim 7 ,
 wherein a focal point distance of the objective optical system is greater than a distance between the light source and the photography unit.   
     
     
         9 . The inner surface shape measurement device according to  claim 1 ,
 wherein the light source includes   a measurement light source which emits measurement light toward the optical system; and   an illumination light source which emits illumination light for causing the photography unit to capture a bright field image of the inner surface.   
     
     
         10 . The inner surface shape measurement device according to  claim 9 ,
 wherein the illumination light source has an optical axis directed in a direction in which the axis line extends.   
     
     
         11 . The inner surface shape measurement device according to  claim 10 ,
 wherein the illumination light source emits the illumination light toward the optical system, and   the optical system reflects the illumination light in a direction intersecting the direction in which the axis line extends.   
     
     
         12 . The inner surface shape measurement device according to  claim 9 ,
 wherein the illumination light source emits the illumination light in a direction intersecting a direction in which the axis line extends.   
     
     
         13 . The inner surface shape measurement device according to  claim 9 ,
 wherein the photography unit includes an objective optical system whose focal point distance is greater than a distance between the light source and the photography unit.   
     
     
         14 . The inner surface shape measurement device according to  claim 9 ,
 wherein the wiring extends from the light source toward the photography unit along the axis line, and is bent in a direction intersecting the axis line at a position apart from the photography unit by a predetermined distance.   
     
     
         15 . The inner surface shape measurement device according to  claim 9 , further comprising:
 a cylindrical member including a photography-unit-side opening disposed at a position apart from the photography unit by a predetermined distance and a light-source-side opening opened to the light source, the cylindrical member has a central axis line extending along the axis line between the light source and the photography unit,   wherein the wiring is inserted into the cylindrical member.   
     
     
         16 . The inner surface shape measurement device according to  claim 9 ,
 wherein the wiring of at least positioned in a range of a view field of the photography unit has optical transparency.   
     
     
         17 . The inner surface shape measurement device according to  claim 9 , further comprising an insertion portion inserted into the test target,
 wherein the insertion portion includes   a main body formed in a cylindrical shape; and   a detection head formed in a container-shape in which the axis line is located therein, the detection head detachably provided at an end portion of the main body, and   the optical system and the light source are disposed inside the detection head.   
     
     
         18 . The inner surface shape measurement device according to  claim 17 ,
 wherein the photography unit includes an objective optical system, and   at least a portion of optical elements constituting the objective optical system is disposed inside the detection head.   
     
     
         19 . The inner surface shape measurement device according to  claim 18 ,
 wherein a focal point distance of the objective optical system is greater than a distance between the light source and the photography unit.   
     
     
         20 . A detection head which is attachable to an endoscope in order to measure a shape of an inner surface of a test target, the detection head comprising:
 a light source;   an optical system which converts light emitted by the light source into a disc-shaped light beam to cause the light beam to be emitted toward the inner surface;   a photography unit which captures an image of a state in which the light beam is projected on the inner surface; and   a wiring which supplies power for driving the light source,   wherein the optical system, the light source and the photography unit are disposed in this order along a same axis line, and   the wiring extends from the light source toward the photography unit   
     
     
         21 . An endoscope device for measuring a shape of an inner surface of a test target, the endoscope device comprising:
 an insertion portion inserted into the test target;   a detection head disposed at a first end of the insertion portion; and   a manipulation unit disposed at a second end of the insertion portion,   wherein the detection head includes:   a light source;   an optical system which converts light emitted by the light source into a disc-shaped light beam to cause the light beam to be emitted toward the inner surface;   a photography unit which captures an image of a state in which the light beam is projected on the inner surface; and   a wiring which supplies power for driving the light source,   the optical system, the light source and the photography unit are disposed in this order along a same axis line, and   the wiring extends from the light source toward the photography unit.