JP2016075509A - Tool for inspecting inside of cylindrical hole, and inspection device of inside of cylindrical hole using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool for inspecting the inside of a cylindrical hole that can inspect the inner surface of the hole up to the bottom side end, and can be inserted into even a hole having a narrow inner diameter, and provide an inspection device of the inside of a cylindrical hole using the tool.SOLUTION: A tool T for inspecting the inside of a cylindrical hole is used for finding and inspecting irregularity existing on the inner surface of the cylindrical hole formed as a finished article. The tool T includes a rod member 10 whose base end side faces an imaging apparatus C, and a mirror unit 11 that is disposed on the tip side of the rod member and a mirror-finished conical surface. The conical surface of the mirror unit is disposed so as to face the base end side of the rod member.SELECTED DRAWING: Figure 1

Description

  The present invention is a cylindrical through-hole inspection instrument that is inserted into a cylindrical through-hole or tube provided in a processed part or molded product, or a hole having a bottom, photographs an inner surface state, and inspects the inner surface; The present invention relates to a cylindrical hole inspection apparatus using the same.

  In the case of a processed product formed by casting or molding, if a through hole or a bottomed hole is formed at the same time as or after molding, a pinhole is caused on the inner surface due to conditions during the molding stage of the processed product. (Burrows) or cracks may occur. If such burrows or cracks occur, the strength at that part will be weakened, the burrow will become a liquid pool, or if it is used in an application where friction occurs, friction will occur. It is also conceivable that the resistance increases. Therefore, when a cylindrical through-hole or hole is formed in a processed product, it may be necessary to inspect the inner surface.

  Conventionally, the inner surface inspection of cylindrical through-holes and holes formed in such processed products is performed by inserting a flat mirror into the cylinder to visually inspect scratches and dirt, or by using a cylindrical scope. There is an inspection device that irradiates illumination light from the tip of an optical fiber etc. provided in the surroundings, shoots the inner surface of the hole with a fisheye lens etc. provided at the tip of the scope, and guides the inner surface image to the camera through the optical system in the scope It was done.

  However, with visual inspection, fine scratches and dust may be overlooked, and it is difficult to quantify the size. Also, inspection tools such as cylindrical scopes are fisheye lenses. Because of the shooting, there is a problem that it is difficult to control the shooting distance, and a slight error in operation greatly reflects the quantification of the hole size.

  Therefore, conventionally, an in-cylinder inspection jig using a conical mirror has been proposed in order to enable a relatively simple structure that does not cost much, is easy to handle, and can easily perform an accurate inspection.

  For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2007-199164), a columnar probe having a conical mirror formed in a conical shape at the tip, a pair of positioning guide portions provided along the probe, There has been proposed an in-cylinder inspection jig comprising a drive device for moving the positioning guide portions at equal distances in opposite directions parallel to each other around a probe.

  Moreover, in patent document 2 (Unexamined-Japanese-Patent No. 6-241760), for the purpose of obtaining the image suitable for not only visual observation but also automatic inspection by a computer, the cylindrical inner wall can be developed on a plane with equal density. A cylindrical inner surface inspection camera device having a television camera inserted into a cylinder to be imaged, comprising a conical mirror disposed so that a central axis coincides with an optical axis of the television camera An inner surface inspection camera device has been proposed.

JP 2007-199164 A JP-A-6-241760

  As described above, a conical mirror is used in order to confirm a burrow or crack in a cylinder. However, in many cases, as shown in Patent Document 1, the image of the conical mirror is configured to be photographed with a camera that exists in front of the conical mirror in the intrusion direction, and can be used. The cylinder had to be a through hole with no bottom surface. This is a necessary problem since the mirror image plane cannot be held when the conical mirror is fixed.

  On the other hand, Patent Document 2 proposes a cylindrical inner surface state inspection camera device configured such that a camera for imaging is installed on the opposite side of the conical mirror intrusion direction and even a hole having a bottom can be inspected. ing.

  However, in the technique of Patent Document 2, the conical mirror and the lens system are installed in a transparent acrylic fixture formed in a cylindrical shape and attached to the television camera. Therefore, it is difficult to mount the conical mirror, and there is a concern that it is difficult to obtain an accurate image if the cone mirror is inclined with respect to the TV camera.

  Therefore, the present invention provides a cylindrical hole inspection device that can reduce the inclination of the conical mirror as much as possible and can be easily manufactured, and a cylindrical hole inspection device using the same. Providing is a first problem.

  Further, when the conical mirror is mounted in a cylindrical transparent acrylic fixture as in Patent Document 2, the outer diameter of the conical mirror and the inner diameter of the transparent acrylic fixture must be matched. It was difficult to attach a conical mirror having a different external shape later. As a result, it has been difficult to change the conical mirror according to the inner diameter of the cylinder to be inspected.

  In view of this, the present invention provides a cylindrical in-hole inspection in which a conical mirror having a different outer diameter, apex angle, or busbar length can be selected arbitrarily according to the inner diameter of the cylinder to be inspected and can be easily installed. A second object is to provide an instrument for use and a cylindrical hole inspection apparatus using the same.

  Further, when the conical mirror is mounted in a cylindrical transparent acrylic fixture as in Patent Document 2, the uniformity of the thickness of the transparent acrylic fixture is not maintained, and distortion is not caused. If it occurs, the mirror image of the conical mirror seen through this transparent acrylic fixture will also be distorted, and from this mirror image, the size of the burrow and crack in the cylinder can be accurately grasped. There was concern that it would be difficult.

  Therefore, in the present invention, the influence of the resin thickness is reduced as much as possible, and the size of the burrow or crack in the cylinder can be accurately grasped from the image acquired from the camera that has taken the mirror image. It is a third object to provide an inspection instrument and a cylindrical hole inspection device using the same.

  And when the conical mirror was attached in a cylindrical transparent acrylic fixture like the said patent document 2, the cap-shaped member for attaching a conical mirror was needed. And since this cap has the wall surface of fixed height, it was not able to test | inspect to the bottom side edge part of the inner wall surface of a bottomed hole by the height of this wall surface. In addition, since the conical mirror must be mounted using a cap, the mounting structure has to be complicated, and the outer diameter has to be increased due to the complexity. For this reason, it was feared that it was impossible to inspect even a hole with a narrow inner diameter.

  Therefore, in the present invention, a cylindrical in-hole inspection instrument that can inspect the inner wall surface of the hole up to the bottom end side and can be inserted even with a narrow inner diameter hole, and a cylinder using the same A fourth problem is to provide an in-hole inspection device.

  In order to solve any of the above-described problems, in the present invention, a mirror portion formed in a shape having a conical surface, such as a conical shape or a truncated cone shape, is provided at the distal end portion of the rod member. The present invention provides a cylindrical hole inspection instrument in which an imaging device such as a camera facing the base end side and a conical surface side of a mirror portion face each other.

  That is, in the present invention, a cylindrical hole inspection instrument for projecting and inspecting irregularities present on the inner surface of a cylindrical hole formed in a processed product, the rod member having a proximal end facing the imaging device And a cylindrical portion provided on the distal end side of the rod member and having a mirror-finished conical surface, the conical surface of the mirror portion being provided toward the proximal end side of the rod member Provide an in-hole inspection instrument.

  The rod member is for supporting the mirror part at least on the tip side, and can be formed to support the conical surface side of the mirror part. However, the rod member is formed so as not to hinder the transmission of the mirror image reflected on the conical surface of the mirror portion to the base end side. Therefore, the rod member can be formed of a transparent resin, a transparent material such as glass or quartz, or a rod-shaped member having a thickness that does not hinder the mirror image.

  When this rod member is made of a transparent material such as transparent resin, glass, crystal, etc., it is necessary to form it with such a degree of transparency that a mirror image from a mirror part to be described later is transmitted. It is formed so that all of the light to be transmitted is transmitted. This is because it cannot be denied that the mirror image lacks accuracy on the peripheral surface of the rod member when the peripheral surface of the rod member exists in the region of the reflected light from the mirror portion. Therefore, when the rod member is formed of a transparent material, it is desirable that the rod member has a thickness that allows all the light reflected from the mirror part to pass therethrough. It is desirable to be formed in the same shape as the subordinate bottom shape. However, the cross-sectional shape of the rod member may be larger than the lower bottom shape of the mirror part as long as it does not hinder the insertion into the hole to be inspected.

Alternatively, the rod member can be formed of a rod-like member having a thickness that does not interfere with the mirror image. Here, if the standard of thickness that does not hinder the mirror image is shown, even if the inside of the cylindrical hole is projected with a conical surface, the mirror image on the apex side will be too small, and even if corrected by numerical calculation It is difficult to perform effective measurement. Therefore, the mirror image on the apex side is not used, and the range of the inner diameter corresponding to the unused region can be set to a thickness that does not hinder the mirror image. This “thickness that does not hinder the mirror image” can be set in accordance with the diameter of the hole to be inspected, the size of a burrow or crack that needs to be detected, for example, 0.1 mm ^2. In the case of inspecting a burrow of a certain area, the “thickness that does not interfere with the mirror image” can be about 1 mm in diameter, preferably about 2 mm.

  In addition, since this rod member is a part inserted into the hole, it is necessary to have a length equal to or longer than the depth of the hole to be inspected, depending on the depth of the hole to be inspected, It may be formed so that it can be arbitrarily changed or exchanged. In addition, since this rod member is inserted into a hole to be inspected together with a mirror part to be described later, its outer diameter needs to be formed smaller than the inner diameter of the hole to be inspected. Depending on the inner diameter of the target hole, the hole may be arbitrarily changed or exchanged.

  The said mirror part is a shape which has a conical surface, Comprising: The said conical surface is comprised so that the inner wall surface of the hole made into a test object can be projected. Therefore, at least the conical surface is formed to have a high reflectance, and it is desirable to form a mirror-like film on the surface of the resin or other molded part, or to polish the metal to achieve a high reflectance. The mirror part can be formed as a single mirror member having a conical surface, or the tip of the rod member can be processed to make the processed part a mirror part.

  In particular, when the tip portion of the rod member is processed to form a mirror portion, the rod member is formed in a columnar shape, and the tip side is recessed into a cone shape or a truncated cone shape, and the recessed cone shape or A mirror part can be formed by mirror-finishing a truncated cone-shaped conical surface. This mirror finish can be carried out by forming a metal film on the conical surface having a conical shape or a truncated cone shape by vapor deposition or sputtering, or by attaching or attaching a metal sheet. When forming the mirror part in this way, if the rod member is formed by injection molding of a transparent resin, a concave shape having a conical surface of a conical shape or a truncated cone shape can be easily formed. There is no variation, and the center line of the conical surface can be accurately aligned with the axis of the rod member. As a matter of course, the tip recessed in this conical shape or truncated cone shape can also be formed by machining such as cutting. And when the tip part of the rod member is processed in this way to form a mirror part, the diameter of the mirror part can be formed to about 2 mm or less, and as a result, a smaller inner diameter (diameter about 2 mm). Can be inspected.

  In addition, when the mirror part is separately formed of resin, metal or the like, it is desirable that the mirror part is connected to the rod member at the center of the conical surface. This is because by attaching to the rod member at the center of the conical surface, it is possible to eliminate the inclination of the mirror part and to make the center line of the conical surface exactly coincide with the axis of the rod member.

  Further, as described above, the mirror image on the upper end side (vertex side) of the conical surface of the mirror part is too small in scale, and even if this is corrected by numerical calculation, it is difficult to ensure accuracy. Therefore, in addition to the conical shape, the mirror portion in the present invention can be formed in a truncated cone shape by removing a portion that is difficult to use for this analysis from the beginning. In particular, if the mirror portion is formed in a truncated cone shape, it can be attached to the rod member using the region of the upper bottom surface. At this time, the method of attaching the truncated cone-shaped mirror part to the rod member is not particularly limited, and the both are joined by an adhesive or the like, or are screwed or formed into the truncated cone shape. Unevenness can be provided on the upper and bottom surfaces of the mirror part, and unevenness can be provided on the tip surface of the rod member so that they can be integrated together. Furthermore, when the rod member is molded with resin, the mirror portion may be attached by in-mold molding. However, the axis of the rod member and the central axis of the mirror part need to coincide with each other. For this purpose, it is desirable to integrate them by screwing or the like.

  And since this mirror part is inserted and used in the cylindrical hole used as a test object, the outer diameter needs to be formed in the magnitude | size which can be inserted in the said hole. At this time, when there are a plurality of holes to be inspected and each hole has a plurality of inner diameters, the mirror portion is detachably attached to the rod member, and the outer diameter is arbitrarily set according to the inner diameter of the holes. It is also desirable to be able to use different mirror parts.

  Moreover, since the peripheral edge of this mirror part is exposed and is inserted into the cylindrical hole, depending on how to install and handle, the edge part between the conical surface and the bottom surface may be impacted, etc. It may be damaged by If it is damaged, it is difficult to obtain an accurate mirror image. Therefore, in the present invention, it is desirable to provide an annular wall portion between the conical surface and the lower bottom surface of the mirror portion in order to form a thick boundary portion between the conical surface and the bottom surface that are easily damaged. By forming such a wall portion, the point between the conical surface and the lower bottom surface of the mirror portion does not have a sharp shape, and even if there are burrs or other protrusions in the hole to be inspected, the mirror The possibility of breakage of parts can be reduced as much as possible. However, when such an annular wall portion is not provided, the inner wall surface can be observed up to the bottom end side of the hole.

  Further, when the cylindrical hole inspection instrument is configured using the cylindrical hole inspection instrument, an imaging device is provided on the proximal end side of the rod member so as to face the conical surface. In many cases, a camera is used as this imaging device, and in particular, taking into account image analysis of shooting data, the light emitted from the shooting object is imaged on the light receiving plane of the imaging device by an optical system such as a lens. It is desirable that the digital camera or the digital camcorder is configured to photoelectrically convert light and darkness of the image into the amount of electric charge, and sequentially read out and convert it into an electric signal. Further, the imaging apparatus does not necessarily have to be configured as a camera, and may be an imaging device including an imaging tube and a solid-state imaging device.

  According to the cylindrical hole inspection instrument configured as described above, the mirror portion is installed with its conical surface facing the imaging device. If the mirror part is made to enter from, the mirror image of the mirror part is projected on the side where the rod member exists. Therefore, by photographing this mirror image, it is possible to inspect and judge irregularities such as burrows and cracks existing in the cylindrical hole. As a matter of course, the cylindrical in-hole inspection instrument can be used without any trouble even if it is a through hole having no bottom surface. At this time, when the through-hole is long, it is desirable to change the length of the rod member according to the length of the hole.

  In order to give a clear mirror image to the imaging means, the cylindrical hole inspection device according to the present invention is preferably configured with a zoom configuration of the mirror image and a light source for clarifying the mirror image. That is, a cylindrical member provided with an imaging device on the base end side, one or more lens members provided in the cylindrical member so as to cross the internal space, and an internal space in the cylindrical member. It is desirable to include a beam splitter provided so as to cross the beam splitter, and an illumination member that emits light to the beam splitter. At this time, it is desirable that the base end side of the rod member provided with the mirror portion on the distal end side is held on the distal end side of the cylindrical member.

  The beam splitter may be any of a prism type, a planar type, and a wedge substrate type, and at least illuminates the inner surface of the cylindrical hole to be inspected with the light supplied from the illumination member, and at least illuminates the area projected by the mirror part. Configured.

  Further, the holding of the rod member at the distal end portion of the cylindrical member needs to be configured so as not to block the mirror image. For example, the rod member is transparent and formed to have the same thickness as the outer diameter of the mirror portion. In this case, the outer diameter of the rod member can be maintained. On the other hand, when the inner diameter of the cylindrical member is larger than the outer diameter of the rod member, the distal end side opening of the cylindrical member is closed with a transparent plate member and fixed to the transparent plate member. You can also.

  The imaging data acquired by the imaging means based on the cylindrical hole inspection instrument configured as described above is then corrected in an electronic information processing apparatus such as a computer in which the correction program is installed, and the cylindrical hole Not only the presence or absence of unevenness such as burrows, cracks, or burrs appearing on the inner surface, but also the size thereof can be clarified.

  According to the present invention, the mirror portion having the conical surface is provided on the distal end side of the rod member having the base end facing the imaging device such as a camera. Can be confirmed and inspected.

  In particular, when this mirror part is formed by processing the tip side of the rod member, and when it is fixed to the rod member at the center of the mirror part, the axis of the rod member can be made to coincide with the central axis of the mirror. Thus, it is possible to provide a cylindrical hole inspection device that can reduce the tilt of the conical mirror as much as possible during assembly and the like, and a cylindrical hole inspection device using the same.

  Furthermore, when the mirror part is formed as a separate body from the rod member, the mirror part and the rod member can be arbitrarily combined, and as a result, the outer diameter depends on the inner diameter of the cylinder to be inspected. It is possible to provide a cylindrical hole inspection device that can be easily installed by arbitrarily selecting a conical mirror having different apex angles or bus bar lengths, and a cylindrical hole inspection device using the same. it can.

  Furthermore, when the mirror part is formed separately from the rod member and integrated with the rod member at the center of the mirror part, there is no transparent resin or the like on the radially outer side of the mirror part. Cylindrical hole inspection instrument that can reduce the influence of resin thickness as much as possible and accurately grasp the size of burrows and cracks in the cylinder from the image acquired from the camera that took the mirror image, and use this A cylindrical in-hole inspection device can be provided.

Furthermore, by using the rod member, the mirror part can be integrated with a simple configuration. As a result, the inner wall surface of the hole can be inspected to the bottom end side, and the hole with a narrow inner diameter is also provided. Even so, it is possible to provide a cylindrical hole inspection device that can be inserted, and a cylindrical hole inspection device using the same.

BRIEF DESCRIPTION OF THE DRAWINGS It is a cylindrical hole inspection instrument concerning this Embodiment, (A) The block diagram of a cylindrical hole inspection apparatus using this, (B) The principal part longitudinal cross-sectional view which shows the mounting state of a rod member and a mirror part. is there. It is a principal part longitudinal cross-sectional view which shows a mode that the inner wall surface of a test object is projected, (A) When inspecting a cylindrical hole without a bottom, (B) When inspecting a cylindrical hole with a bottom, respectively Show. It is a principal part longitudinal cross-sectional view which shows the some attachment example of the rod member concerning this Embodiment, and a mirror part. It is a principal part longitudinal cross-sectional view which shows some further mounting examples of the rod member and mirror part concerning this Embodiment.

  Hereinafter, a cylindrical hole inspection apparatus and a cylindrical hole inspection apparatus using the same according to the present embodiment will be described in detail with reference to the drawings. However, the cylindrical hole inspection device according to the present invention and the cylindrical hole inspection device using the same are not limited to the present embodiment, and may be appropriately changed within the scope of the invention. Is possible.

  FIG. 1 is a cylindrical hole inspection device according to the present embodiment, (A) a configuration diagram of a cylindrical hole inspection device using the same, and (B) a longitudinal section of a main part showing a mounting state of a rod member and a mirror part. FIG. 2 is a longitudinal sectional view of a main part showing a state in which an inner wall surface to be inspected is projected, and FIG. 2A shows a case where a cylindrical hole having no bottom is inspected, and FIG. The case of inspecting a cylindrical hole is shown. FIG. 3 is a longitudinal sectional view of an essential part showing some mounting examples of the rod member and the mirror part according to this embodiment, and FIG. 4 shows some further examples of the rod member and the mirror part according to this embodiment. The principal part longitudinal cross-sectional view which shows the example of mounting | wearing is shown.

  The cylindrical hole inspection instrument T in FIG. 1 is provided with a camera as an imaging device C on the upper end side, a rod member 10 provided with a proximal end facing the imaging device C, and a distal end side of the rod member 10. And a mirror part 11 having a mirror-finished conical surface 12.

  The rod member 10 is formed of a cylindrical plastic material, and is formed of a material having high transparency so that all the light reflected from the conical surface 12 of the mirror part 11 can be transmitted. Further, the cross-sectional shape of the rod member 10 is the same as the bottom bottom shape of the mirror part 11 so that all the light reflected from the conical surface 12 of the mirror part 11 can be transmitted and there is no hindrance to insertion into the hole to be inspected. A concave portion is formed on the distal end surface to attach a connecting member 21 described later. Furthermore, since the rod member 10 is used by being inserted into a hole to be inspected, the rod member 10 is configured to be replaceable so as to adapt to the size and depth of the hole. By doing so, the rod member 10 suitable for the inner diameter and depth of the hole to be inspected can be selected.

  The mirror portion 11 is formed in a truncated cone shape with the upper end side (vertex side) removed, and a metal film having a high reflectance is applied to the surface. And the hole part which lets the column-shaped connection member 21 pass is formed in the removed part, and the connection member 21 which passed this hole is attached to the recessed part provided in the front end surface of the rod member 10 (or fitting). The rod member 10 and the mirror part 11 are integrated. In addition, you may form the processus | protrusion which attaches or fits in the recessed part provided in the front end surface of the said rod member 10 in the upper-bottom surface of the mirror part formed in the said truncated cone shape.

  As described above, the reason for the truncated cone shape with the upper end side (vertex side) of the mirror part 11 removed is that the mirror image projected on the upper end side (vertex side) is reduced in scale, and thus corrected by numerical calculation. This is because it is difficult to ensure accuracy. Furthermore, since the mirror part 11 is used by being inserted into a cylindrical hole to be inspected, like the rod member 10, it can be exchanged to adapt to the size and depth of the hole.

  Further, the conical surface 12 of the mirror portion 11 is provided toward the proximal end side of the rod member 10, and an annular wall portion 22 is provided between the conical surface 12 and the lower bottom surface. This is because the peripheral edge of the bottom surface of the mirror part 11 is exposed and there is a risk of being damaged by impact depending on the installation method and handling method when inserted into the cylindrical hole. It is provided for the purpose. By forming such a wall portion 22, there is no sharp shape between the conical surface 12 and the lower bottom surface of the mirror portion 11, and even if there are burrs or other protrusions in the hole to be inspected. The possibility that the mirror part 11 is damaged can be reduced as much as possible. Such a wall portion can be appropriately set as long as it is not damaged. For example, the wall portion can be formed with a height of about 0.3 mm or more, preferably about 0.5 mm. However, depending on the object to be inspected, if it is necessary to check and inspect up to the inner wall surface at the bottom of the hole, the conical surface and the bottom surface can be sharpened without forming this wall. .

  As described above, the rod member 10 having the mirror portion 11 mounted on the distal end side is mounted in a cylindrical tubular member 13 provided with the imaging device C on the upper end side. The cylindrical member 13 is provided with an irradiation member 15 and a prism type beam splitter 14 is provided so as to cross the internal space in the cylindrical member 13. Similarly, two lens members 16 (an objective lens, a collimator lens, etc.) are provided in the cylindrical member 13 so as to cross the internal space.

  As a result, the light emitted from the irradiation member 15 such as an LED or a light bulb is guided to the distal end side of the rod member 10 by the beam splitter 14 and reflected by the mirror portion 11 to be inside the cylindrical hole to be inspected. The inspection is started with the wall surface illuminated and the area projected by the mirror 11 being clear. The mirror image reflected by the conical surface 12 of the mirror unit 11 is converted into a real image via the rod member 10 and the lens member 16 and is captured by the imaging device C. Data captured in the above flow is converted by the image array conversion device 17 and displayed on the display control device 18, and the output of the display control device 18 is displayed on the monitor 20 and analyzed by the computer 19. ing.

  According to the cylindrical hole inspection apparatus configured as described above, not only the presence or absence of burrows, cracks, or burrs that appear on the inner surface of the cylindrical hole, but also its size can be clarified. Accurate fault detection is possible. The cylindrical hole inspection instrument T can be inserted into the hole manually or by using power such as a servo motor.

  Here, as shown in FIGS. 2 (A) and 2 (B), in the cylindrical hole inspection tool T according to the present embodiment, in the case where the inspection target is the cylindrical hole 23A having no bottom, of course, the bottom Even in the case of the cylindrical hole 24B having the above, the inspection can be carried out effectively. In particular, in the case of a hole with a bottom, it is conceivable to hold the conical mirror in a transparent cylindrical member. However, since it has a cover, it is difficult to insert the mirror portion 11 to the bottom of the hole, and the diameter is too small. It will be difficult to measure the holes. In this regard, according to the present embodiment, there is nothing that obstructs insertion of the mirror part 11 and inspection can be performed up to the bottom, and the shape of the mirror part 11 can be appropriately set even in a small-diameter hole. The inspection can be carried out effectively.

  Moreover, the mounting method of the said rod member 10 and the mirror part 11 can be suitably set according to the intended purpose and the raw material and shape of the cylinder used as a test object. For example, in FIG. 3A, the rod 10A is formed with a small diameter, and its lower end is mounted in a small diameter depression provided on the upper bottom surface of the mirror portion 11A formed in a truncated cone shape. Therefore, the rod member formed in this way is formed to be at least the same diameter or smaller than the upper bottom surface of the mirror part 11 formed in a truncated cone shape. By forming the mirror image in this way, the mirror image reflected by the mirror portion 11A is completely obstructed at the time of imaging, so that a clearer real image can be realized. However, since the rod member 10A is formed with a small diameter, a transparent annular plate member 31 is bonded to the distal end side of the cylindrical member 12, and the plate member 31 and the rod member 10 are bonded. The rod member 10A is held.

  Further, as shown in FIG. 3B, the rod member and the mirror portion are integrated by forming a convex portion protruding from the upper bottom surface on the upper bottom surface of the mirror member 11B formed in a truncated cone shape. A concave portion that matches the convex portion may be provided on the tip side of the member 10B, and both may be fitted. This eliminates the need for the connecting member 20 and leads to saving of members.

  Further, as shown in FIG. 3C, the rod member and the mirror unit are integrated with each other by forming the rod member 10C in a pipe shape to make the inside hollow, and on the tip side of the rod member 10C formed in the pipe shape. Alternatively, a transparent plate member 32 provided with a hole at the center may be mounted, and the mirror part 11C may be fitted into the hole. Here, a convex portion protruding from the upper bottom surface can be provided on the upper bottom surface of the mirror portion 11C formed in a truncated cone shape, and the convex portion can be fitted or attached to the hole.

  In the embodiment shown in FIGS. 3A to 3C, since the mirror part is formed separately from the rod member, any mirror part can be selected and used. For this reason, the mirror part can be arbitrarily selected and used in a shape having a different apex angle, height, or length or inclination of the busbar. For example, when observing widely in the depth direction of the hole, a mirror part having a long distance between the upper base and the lower base can be used.

  In addition, the rod member and mirror part can be integrated by forming the tip side of the rod member into a conical shape or a truncated cone shape, and providing the mirror part in this recessed part or mirror finishing It is. For example, in FIG. 4D, the tip end side of the rod member 10D is formed in a conical shape, and the mirror part 11D is formed in a convex shape in a conical shape, and both are bonded. Since this rod member is formed by injection molding using a transparent resin, a conical dent shape can be easily formed, there is no variation in the product, and the center of the conical surface of the mirror portion 11D. The line can be accurately aligned with the axis of the rod member 10D.

  Here, a polishing portion 41 is provided on the periphery of the rod member 10D at a height up to the top of the recess portion, and polishing is performed. This is because when the concave portion of the rod member 10D and the conical surface of the mirror portion 11D are bonded to reflect the mirror image, an accurate mirror image that is not distorted is displayed.

  Further, as shown in FIG. 4E, it is also possible to integrally form a rod member 10E having a conical recess at the tip side and a mirror portion 11E having a conical surface by insert injection molding. By doing so, it is not necessary to bond or glue them together later, so that it is possible to find a possibility of reducing the manufacturing cost and shortening the construction period. When insert processing is performed in this way, it is desirable to form unevenness or knurling for preventing the removal at the upper end of the mirror portion.

  Further, the tip end side of the rod member 10F can be mirror-finished as shown in FIG. That is, the rod member 10F is formed by recessing the tip end side into a truncated cone shape, and providing the mirror surface processing portion 42 in the recess portion to perform mirror surface processing. The mirror surface processing portion 42 is formed so as to reflect light in the same manner as the mirror, and there is no limitation on the processing method, and a metal film is formed by vapor deposition or sputtering, or a metal sheet is attached or attached. Etc. By doing so, it is not necessary to form the mirror part as a separate member, and there is no risk that the center line of the conical surface of the mirror part and the axis of the rod member will be displaced. That is, the mirror image is not distorted due to the misalignment of both axes, and more accurate mirror image can be realized. Further, since the rod member only needs to be molded and then mirror-finished by vapor deposition or the like, it can be formed more easily. The distal end side of the rod member 10F does not necessarily have to be recessed into a truncated cone shape, and may be recessed into a cone shape.

Here, in FIG. 4F, since the tip of the rod member 10F has a pointed shape, when the cylinder to be inspected has a bottom surface, the tip portion is on the bottom surface depending on the operation method. It is also possible that the front end will collide. Therefore, in FIG. 4G, the rod member 10G is chamfered by forming the distal end side in a conical shape and providing the chamfered portion 43 without sharpening the distal end portion. Then, the same mirror-finished portion 42 is provided in the conical recess. According to the above configuration, the risk of the tip portion of the rod member 10G being damaged can be greatly reduced, so even if the cylinder has a bottom, it can be inserted to the bottom of the bottom. An accurate mirror image of the inner wall surface at the bottom is possible.

T Cylindrical hole inspection instrument C Imaging device 10 Rod member 11 Mirror part 12 Conical surface 13 Cylindrical member 14 Beam splitter 15 Irradiation member 16 Lens member 17 Image array conversion device 18 Display control device 19 Computer 20 Monitor 21 Connection member 22 Wall Part 23A Cylindrical hole 24B Cylindrical hole 31, 32 Plate member 41 Polishing part 42 Mirror surface processing part 43 Chamfering part

Claims (7)

A cylindrical hole inspection instrument for projecting and inspecting irregularities present on the inner surface of a cylindrical hole formed in a processed product,
A rod member whose proximal end faces the imaging device;
The rod member is provided on the tip side of the rod member, and includes a mirror portion having a mirror-finished conical surface.
The cylindrical hole inspection instrument, wherein the conical surface of the mirror portion is provided toward the proximal end side of the rod member.
The rod member is formed in a columnar shape, and the mirror portion has the tip end side of the rod member recessed into a cone shape or a truncated cone shape, and the conical surface of the recessed cone shape or truncated cone shape is mirror-finished. The cylindrical hole inspection instrument according to claim 1, which is formed as described above.
The cylindrical hole inspection instrument according to claim 1, wherein the mirror part is connected to a rod member at the center of the conical surface.
The cylindrical hole inspection instrument according to claim 3, wherein the mirror part has a truncated cone shape, and the mirror part is attached to the distal end surface of the rod member.
The cylindrical hole inspection instrument according to claim 3 or 4, wherein the rod member is formed of a transparent material, and a cross-sectional shape orthogonal to the length direction is the same as the shape of the bottom bottom of the mirror part. .
The cylindrical hole inspection instrument according to any one of claims 3 to 5, wherein the mirror portion is provided with an annular wall portion between a conical surface and a lower bottom surface.
A cylindrical member provided with an imaging device on the base end side, one or more lens members provided in the cylindrical member so as to cross the internal space, and the internal space in the cylindrical member. A beam splitter provided to perform, and an illumination member that irradiates light to the beam splitter,
The cylindrical hole inspection instrument according to any one of claims 1 to 6, wherein the rod member is held on a distal end side of the cylindrical member.