JP2018107492A - Imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging apparatus in which suppression effect to adhesion of a scattering material from a weld part to a lens or the like is increased.SOLUTION: An imaging apparatus 1 comprises: an imaging part 10 imaging an optical image from a weld part 50 incident into a lens 13; and a lens protection part 30 provided onto an optical light passage L2 from the weld part 50 between the weld part 50 and the lens 13. The lens protection part 30 includes: a gas supply nozzle 35 ejecting a gas supplied from a gas supply pipe 34; a diffuser part 33 that introduces the gas from the gas supply nozzle 35 from one end part, and exhausts the gas from the other end part; openings 36a, 36b provided at a position crossing the optical light passage L2, and at a position opposite to the optical light passage L2; and a connection part 32 reducing the gas ejected from the gas supply nozzle 35 and introducing the gas to the diffuser part 33.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an imaging apparatus.

  2. Description of the Related Art Conventionally, an imaging device for imaging a welded part during welding is known. In such an imaging apparatus, a protection means for protecting the optical system from scattered matter from a welded portion such as fume and spatter is necessary. On the other hand, in Patent Document 1, a protection plate is provided at the tip of the light guide that guides the optical axis of the camera to the welded portion, and air is supplied between the tip of the light guide and the protection plate to scatter. An arrangement to prevent things is shown.

JP 07-299565 A

  However, as described in Patent Document 1, in the case of a configuration that prevents scattered objects by supplying air, it is necessary to sufficiently increase the air pressure in order to prevent the scattered objects, and it is possible to suppress adhesion of scattered objects. There was room for improvement to increase effectiveness.

  The present invention has been made in view of the above, and an object of the present invention is to provide an imaging apparatus with an enhanced suppression effect on the adhesion of scattered objects from a welded part to a lens or the like.

  In order to achieve the above object, an imaging apparatus according to an aspect of the present invention includes an imaging unit that captures an image of light from a welding unit incident on a lens, and the welding unit between the lens and the welding unit. A lens protection unit provided on the optical path of the light, and the lens protection unit includes a gas supply nozzle that ejects a gas supplied from a gas supply pipe, and one end portion of the gas from the gas supply nozzle The diffuser portion that is introduced from the other end portion and discharged from the other end portion is provided at a position that intersects the optical path and has an opening corresponding to the optical path, and the gas ejected from the gas supply nozzle is decompressed And a connecting portion to be introduced into the diffuser portion.

  According to the above imaging device, the lens protection unit is provided in front of the lens of the imaging unit. In the connecting portion of the lens protection portion, when the gas ejected from the gas supply nozzle is decompressed and introduced into the diffuser portion, the opening on the welded portion side of the openings provided at positions corresponding to the optical path is used. Thus, the gas outside the lens protection part is sucked, and a gas flow discharged from the diffuser part together with the gas from the gas supply nozzle is formed. Therefore, even if the scattered matter from the welded part enters the lens protection part through the opening on the welded part side, the movement of the scattered object to the diffuser part is promoted in the same way as the gas flow. Can be prevented from adhering to the lens or the like.

  Here, the connecting portion is provided apart from the lens, and the gas is provided between the lens and the opening on the lens side of the opening of the connecting portion provided at a position corresponding to the optical path. It can be set as the aspect which has the branch pipe which supplies the gas from a supply pipe | tube.

  Since the imaging apparatus has the above-described configuration, in addition to the gas from the gas supply nozzle and the external gas sucked through the opening, the gas from the branch pipe that has flowed into the connection portion through the opening on the lens side A gas flow that mixes in the connecting portion and is discharged from the diffuser portion is formed. As a result, even if the scattered matter from the welded portion enters the lens protection portion through the opening on the welded portion side, the scattered matter from the welded portion is caused by the gas flowing from the branch pipe to the connecting portion through the opening on the lens side. Is further suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the imaging device with which the suppression effect with respect to adhesion with the lens etc. of the scattered material from a welding part was improved is provided.

1 is a schematic configuration diagram of an imaging apparatus according to an embodiment of the present invention. It is the elements on larger scale of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic configuration diagram of an imaging apparatus according to an embodiment of the present invention. FIG. 1 shows a state in which the imaging device 1 is applied to observation of the welded portion 50. FIG. 2 is an enlarged view of the vicinity of the lens protection unit of the imaging apparatus. The imaging device 1 according to the present embodiment is a device that images a welded portion in MAG (Metal Active Gas) welding which is a kind of so-called gas shield arc welding. In MAG welding, welding base materials are joined by melting filler wire 52 extending from welding torch 51 while supplying a shielding gas such as an inert gas. At this time, the welded portion 50 refers to the vicinity of the tip of the filler wire 52 on which arc welding is performed.

  The imaging device 1 according to the present embodiment includes an imaging unit 10 and a lens protection unit 30. The imaging unit 10 includes a main body unit 11, a light guide unit 12, and a lens 13.

  The main body 11 of the imaging unit 10 includes an imaging element unit 14 and an imaging optical system 15 for the imaging element unit 14. In the imaging element section 14, a plurality of imaging elements such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS) are arranged in a planar shape. The imaging element unit 14 has a function of converting light incident through the imaging optical system 15 into electric charges and outputting the electric signals. The imaging unit 10 is realized as a CCD camera or a CMOS camera. In the imaging unit 10, a light guide unit 12 is provided so as to form an optical path of light incident on the main body unit 11, and a lens 13 is provided in the vicinity of one end portion of the light guide unit 12.

  The light guide unit 12 is a cylindrical member having an optical path formed therein. In the present embodiment, the base barrel portion 16, the intermediate barrel portion 17, and the distal barrel portion 18 are connected to the main body portion 11 in this order. The proximal end barrel portion 16 is attached to the main body portion 11 via a screw portion formed at one end portion. At the other end of the base end barrel portion 16, the intermediate end barrel portion 17 is perpendicular to the base end barrel portion 16 so that one end of the intermediate end barrel portion 17 is interposed via a screw portion. The ends are connected. In addition, at the other end of the intermediate barrel portion 17, one end of the distal end barrel portion 18 is interposed via a screw portion so that the distal end barrel portion 18 is at a predetermined angle with respect to the intermediate barrel portion 17. Side ends are connected. A reflection mirror 19 is provided on the proximal barrel section 16 side of the coupling portion between the proximal barrel section 16 and the intermediate barrel section 17, and the coupling section between the intermediate barrel section 17 and the distal barrel section 18. A reflecting mirror 20 is provided on the distal end barrel 18 side. The reflecting mirrors 19 and 20 are provided to bend the traveling direction of the optical path L1 in the light guide unit 12.

  The intermediate barrel portion 17 is provided with a lens unit 21 as a relay optical member. The lens unit 21 can be moved along the optical path L1 and has a function of adjusting the focal point. The intermediate lens barrel 17 is provided with a cooling flow path 22. When a coolant such as cooling water flows through the cooling flow path 22, each part of the intermediate lens barrel part 17 and each part of the tip lens barrel part 18 connected to the intermediate lens barrel part 17 are cooled. The cooling flow path 22 may be provided in addition to the intermediate lens barrel portion 17.

  The distal lens barrel 18 is provided with a diaphragm member 24 at the end of the imaging target welded portion 50 side. The throttle hole 25 is adjusted by the throttle member 24. The lens 13 is provided in the front end barrel portion 18 and has a function of allowing light from the aperture 25 to enter and propagate as parallel light to the main body portion 11 at the subsequent stage. For example, an aspheric lens can be used as the lens 13. Also, a plano-convex lens may be used as the lens 13. The lens 13 is selected based on the size of the object to be imaged, the diameter of the aperture 25, and the like. By providing the lens 13 in the tip barrel 18, the lens 13 can be brought closer to the weld 50. Therefore, the angle of view of the lens 13 can be reduced. The diameter of the throttle hole 25 can be set to 1 mm or less, for example.

  In the imaging unit 10 in the imaging apparatus 1 of the present embodiment, a light guide unit 12 is provided between the main body unit 11 and the lens 13. For this reason, for example, the light guide part 12 (all or a part thereof) and the lens 13 can be brought close to the welded part 50. Depending on the welded part 50, there may be a case where a sufficient space for arranging the imaging device 1 cannot be secured around the welded part 50, such as welding in a narrow part or welding in a narrow groove. Even in such a case, by adopting a configuration in which the lens 13 is disposed via the light guide unit 12, even when the main body 11 of the imaging unit 10 cannot be disposed around the welded unit 50, the lens 13 is disposed in the vicinity of the welded unit 50. Imaging becomes possible. The shape and size of the light guide unit 12 can be changed as appropriate. However, by reducing the diameter of the cylindrical light guide unit 12, even if the periphery of the welded part 50 is a narrower space, the lens 13 can be arranged.

  Next, the lens protection unit 30 will be described. The lens protection part 30 is provided on the side of the welding part 50 to be imaged from the front end barrel 18 along the optical path L2 of light incident from the welding part 50 into the aperture hole 25 of the front end barrel 18. That is, the lens protection part 30 is provided on the welding part 50 side of the lens 13 and at a position separated from the lens 13 via the diaphragm member 24 of the distal end barrel 18 and the like. The lens protection unit 30 includes a nozzle support unit 31, a connection unit 32, and a diffuser unit 33. In the present embodiment, the case where the connecting portion 32 and the diffuser portion 33 have an integrated cylindrical structure will be described. However, the connecting portion 32 and the diffuser portion 33 may be configured by separate members. The connecting portion 32 and the diffuser portion 33 extend in a direction intersecting the optical path L2 of light incident from the welded portion 50 to the aperture hole 25 of the distal end barrel portion 18. Although the material of the connection part 32 and the diffuser part 33 will not be specifically limited if it is a material which has heat resistance, such as copper, for example, it is possible to prevent that the light from the welding part 50 reflects irregularly on an outer surface or an inner surface. preferable.

  The nozzle support portion 31 supports a gas supply pipe 34 and a gas supply nozzle 35 that supply gas to the connection portion 32 and the diffuser portion 33. Further, the nozzle support part 31 is connected to the connection part 32 and has a function of supporting the lens protection part 30 including the diffuser part 33 with respect to the light guide part 12. In the present embodiment, the nozzle support portion 31 is fixed to the lower end of the intermediate barrel portion 17 (the end portion on the distal end barrel portion 18 side) by screwing or the like.

  In addition, a gas supply pipe 34 that supplies a shielding gas and a gas supply nozzle 35 that ejects gas from the gas supply pipe 34 are attached to the nozzle support portion 31. The gas supplied from the gas supply pipe 34 and the gas supply nozzle 35 can be appropriately selected according to the gas used in the welded portion 50. For example, the same inert gas as the gas used in the welded portion 50 is used. Can be used. Further, air may be used as the shielding gas.

  The inner diameter of the tip 35 a of the gas supply nozzle 35 is smaller than the inner diameter of the gas supply pipe 34. Further, the tip 35 a of the gas supply nozzle 35 protrudes from the end of the nozzle support portion 31 on the connection portion 32 side toward the connection portion 32, but enters from the welded portion 50 into the aperture hole 25 of the tip barrel portion 18. It arrange | positions in the position which does not block the optical path L2 of the light to carry out. Since the nozzle support portion 31 and the connection portion 32 are in contact with each other, the periphery of the tip 35 a of the gas supply nozzle 35 is closed by the nozzle support portion 31 and the connection portion 32.

  The gas supply pipe 34 has a branch pipe 34 a that branches from the main pipe to the gas supply nozzle 35 and supplies gas to a region formed between the aperture hole 25 in the front end barrel portion 18 and the lens 13. . The branch pipe 34 a has a function of supplying gas from the gas supply pipe 34 to a region between the aperture hole 25 and the lens 13. The flow rate of the shielding gas supplied to the region between the aperture 25 and the lens 13 through the branch pipe 34a can be appropriately set based on the inner diameter of the branch pipe 34a. However, the flow rate of the gas supplied from the branch pipe 34a needs to be set smaller than the flow rate of the gas supplied from the gas supply nozzle 35, and is 10% of the flow rate of the gas supplied from the gas supply nozzle 35. It is preferable to set the flow rate that can maintain the state where the lens side is at a positive pressure below or below.

  The connection part 32 and the diffuser part 33 are cylindrical members such as a cylinder, for example, and the optical path L2 of the light incident from the welded part 50 to the aperture hole 25 of the distal end barrel part 18 is connected to the connection part 32 and the diffuser part 33. It is provided so as to pass through the axis and to be orthogonal to the axis. However, the optical path L2 does not have to be orthogonal to the axis of the connection portion 32 and the diffuser portion 33, as long as the optical path L2 passes through the inside of the cylindrical member constituting the connection portion 32 and the diffuser portion 33. Good.

  The connection portion 32 on the gas supply nozzle 35 side is provided with an opening corresponding to the diameter of the optical path L <b> 2 so that light from the welded portion 50 enters the aperture hole 25. That is, the opening 36a is provided on the side surface of the connecting portion 32 that faces the diaphragm hole 25, and the opening 36b is provided at a position that faces the opening 36a along the optical path L2. Since the hole diameters of the openings 36a and 36b are set based on the size of the optical path L2, the hole diameter of the opening 36b is larger than the hole diameter of the opening 36a. The aperture diameter of the aperture hole 25 and the aperture diameters of the openings 36 a and 36 b are set so as to satisfy the angle of view α required for imaging by the imaging unit 10.

  The diffuser portion 33 is coupled to the end portion of the connection portion 32 opposite to the end portion on the gas supply nozzle 35 side. The diffuser portion 33 has a region where the inner diameter changes according to the distance from the connection portion 32. Specifically, the diffuser portion 33 has a region in which the inner diameter is the smallest in the vicinity of the end portion on the connection portion 32 side, and the inner diameter changes so as to increase toward the opposite end portion. . The inner diameter of the end portion on the connection portion 32 side and the inner diameter of the opposite end portion are set based on how the flow rate and flow velocity of the gas in the diffuser portion 33 are controlled. In the diffuser portion 33 of the present embodiment, an example is shown in which the inner diameter is controlled by providing the convex portion 33a inside, but the diffuser portion 33 is deformed by deforming the cylindrical member itself constituting the diffuser portion 33. The inner diameter may be changed.

  Further, the end portion 33b opposite to the end portion on the connection portion 32 side of the diffuser portion 33 (continuous with respect to the connection portion 32 in the present embodiment) does not face the welded portion 50 that is the imaging target. Open in the direction. In the present embodiment, the diffuser portion 33 extends along the anti-collision cover 26 attached to the side surface opposite to the welded portion 50 side of the intermediate lens barrel portion 17, and ends opposite to the welded portion 50. A portion 33b is provided.

  The imaging device 1 is used to capture an image of the weld 50 at the tip of the filler wire 52 extending from the welding torch 51. For example, the lens protector 30 at the tip is located at a distance of about 600 mm from the weld 50. Is placed. The light generated in the welded portion 50 passes through the openings 36 b and 36 a of the connecting portion 32 of the imaging device 1 and then enters the distal end barrel portion 18 of the light guide portion 12 through the aperture 25. The light that has entered the distal barrel 18 is collimated by the lens 13 and then propagates along the optical path L1 of the distal barrel 18, the intermediate barrel 17, and the proximal barrel 16. In the main body 11, the light passes through the imaging optical system 15 and enters the image pickup device of the image pickup device portion 14. As a result, an image obtained by imaging the welded portion 50 in the main body 11 is acquired.

  Here, in the imaging apparatus 1 according to the present embodiment, imaging by the imaging unit 10 is performed while supplying high-pressure gas from the gas supply nozzle 35 of the lens protection unit 30. By supplying a high-pressure gas from the gas supply nozzle 35 in the lens protection unit 30, a gas flow G <b> 1 passing through the inside of the cylindrical connection unit 32 and the diffuser unit 33 is formed. The gas flow G1 is ejected in a supersonic flow state from the gas supply nozzle 35 having an inner diameter smaller than that of the gas supply pipe 34, but is reduced in pressure at the connection portion 32 to become a low pressure. The connection portion 32 and the diffuser portion 33 function like an ejector that generates a vacuum with respect to the low-pressure sonic flow gas flow G1. Specifically, the gas G <b> 2 is sucked from the opening 36 a of the connection portion 32 because the gas flow G <b> 1 becomes a low pressure inside the connection portion 32. Similarly, the gas G3 inside the distal end barrel 18 is sucked into the connection part 32 from the opening 36b of the connection part 32. These gases flow into the diffuser part 33 continuous with the connection part 32 in a state of being mixed with the gas flow G1. Thereafter, the air is discharged from the end portion 33 b of the diffuser portion 33 while being decelerated and boosted with a change in the inner diameter of the diffuser portion 33.

  In this way, the lens protection unit 30 functions as an ejector by the gas flow G1 supplied from the gas supply nozzle 35, and the external gas G2 is sucked from the opening 36a of the connection portion 32 and discharged from the end portion 33b of the diffuser portion 33. By having the configuration, the protection effect of the lens 13 provided on the optical path L1 of the imaging device 1 is enhanced. That is, scattered matter such as fume and spatter generated and scattered in the welded portion 50 may enter the connection portion 32 from the opening 36a of the lens protection portion 30, but the gas flow G1 is formed, Like the gas G2, it is mixed with the gas flow G1 and discharged from the end 33b of the diffuser section 33. For this reason, it is possible to prevent the scattered matter such as fume and spatter from the welded portion 50 from adhering to the lens 13 and the aperture 25 and blocking the optical path L1 in the imaging unit 10.

  Conventionally, in an image pickup apparatus that picks up an image of a welded part in the vicinity, adhesion of fumes, spatters and the like to a lens or the like has been a problem. For this reason, it has been studied to prevent the adhering of scattered matter such as fume and spatter by supplying a shielding gas to the front stage of the lens in the imaging apparatus. However, when the imaging device is disposed in the vicinity of the welded portion, it is necessary to sufficiently increase the flow velocity of the gas when attempting to change the scattering direction of the scattered matter using the shielding gas. Further, when the gas flow rate is increased, the shielding gas for the lens has an influence on the shielding gas around the welded portion, which may affect the welding itself.

  On the other hand, in the imaging device 1 according to the present embodiment, the lens protection unit 30 functions as an ejector by the gas flow G1, and thus the gas G2 that enters the opening 36b of the connection unit 32 is supplied as a gas supply. A gas flow that is discharged through the diffuser portion 33 together with the gas flow G1 from the nozzle 35 is formed. Therefore, even when the scattered matter from the welded portion 50 enters the inside of the connecting portion 32 from the opening 36b on the welded portion 50 side of the connecting portion 32, it is discharged from the end portion 33b through the diffuser portion 33 together with the gas G2. As described above, since the periphery of the gas supply nozzle 35 is closed and the inside of the connection portion 32 is at a low pressure, the gas flow G1 affects the welded portion 50 through the opening 36b. Can be suppressed.

  Further, since the end portion 33 b of the diffuser portion 33 opens in a direction different from the welded portion 50, it is possible to prevent the gas discharged from the end portion 33 b from affecting the welded portion 50.

  Further, when the shielding gas is supplied to the region between the aperture hole 25 and the lens 13 via the branch pipe 34a, the shielding gas supplied to this region is transferred to the inside of the front end barrel portion 18. As the gas G3, a gas flow is formed which flows from the aperture 25 to the connection portion 32 through the opening 36a on the lens 13 side. When there is a gas flow from the throttle hole 25 into the connection portion 32, the gas flow is a flow that opposes fume / sputtering from the welded portion 50. Therefore, it is possible to further prevent fume, spatter, and the like from the welded portion 50 from adhering to the lens 13, the aperture hole 25, and the like.

  In addition, in order for the lens protection part 30 to function as an ejector as described above, the gas pressure in the gas supply pipe 34 is set high, and the downstream discharge side with respect to the gas pressure in the gas supply pipe 34 is used. It is necessary to design the gas pressure at the end portion 33b to be small and the differential pressure to be sufficiently large. The conditions required for the design for the lens protection unit 30 to function as an ejector are the same as the conditions required for the design of a known device that functions as an ejector.

  As described above, according to the imaging apparatus 1 according to the present embodiment, the lens protection is provided on the optical path L2 of the light incident on the aperture hole 25 of the front end barrel portion 18 from the welding portion 50 in the front stage of the lens 13 of the imaging portion 10. A part 30 is provided. Of the openings 36a and 36b provided at positions corresponding to the optical path L2 when the gas jetted from the gas supply nozzle 35 is decompressed and introduced into the diffuser 33 at the connection portion 32 of the lens protection portion 30. Gas outside the lens protection part is sucked in through the opening 36b on the welding part 50 side, and a gas flow discharged from the diffuser part 33 together with the gas from the gas supply nozzle 35 is formed. Therefore, even if the scattered matter from the welded portion 50 enters the lens protection portion 30 from the opening 36b on the welded portion 50 side, the movement of the scattered matter to the diffuser portion 33 is promoted in the same manner as the gas flow. It can suppress that the scattered matter from the welding part 50 adheres to a lens etc.

  Further, in the imaging apparatus 1, the connection portion 32 is provided apart from the lens 13, and the lens-side opening 36a of the connection portion 32 provided at a position corresponding to the lens 13 and the optical path L2 is provided on the lens side. Between the two, a branch pipe 34a for supplying gas from the gas supply pipe 34 is provided. In this case, in addition to the gas flow G1 due to the gas from the gas supply nozzle 35 and the external gas G2 sucked through the opening 36b on the welded portion 50 side, the branch pipe that has flowed into the connecting portion through the lens-side opening A gas flow discharged from the diffuser portion 33 is formed in a state where the gas G3 by the gas from 34a is mixed. As a result, even if scattered matter from the welded part 50 enters the lens protection part 30 from the opening 36b on the welded part 50 side, the gas flowing from the branch pipe 34a to the connecting part 32 via the opening 36a on the lens 13 side is obtained. The flow further suppresses the scattered matter from the welded portion 50 from adhering to the lens 13 and the like.

  In addition, the lens protection unit 30 attached in the imaging device 1 is attached to the welded portion 50 side to be imaged rather than the distal end barrel 18 where the lens 13 is provided. As described above, the imaging device 1 according to the present embodiment has the light guide 12 (all or a part thereof) and the lens 13 close to the weld 50, so that the welded space is limited in the surrounding space. 50 images can also be taken. The lens protection unit 30 of the imaging device 1 suppresses the scattered matter from the welded part 50 from adhering to the lens 13 or the like even in the vicinity of the welded part 50 having a restriction on the surrounding space as described above, and It is possible to prevent the gas discharged from the end portion 33 b of the diffuser portion 33 from affecting the welded portion 50. In particular, the lens protection unit 30 is configured to be attached to the distal end lens barrel unit 18 and does not require a complicated device configuration. Therefore, the above-described operation can be achieved while preventing an increase in the size of the periphery of the lens 13. . That is, even if the space of the welded part 50 is limited, the lens 13 is protected against scattered matter from the welded part 50, and the influence of the gas discharged from the lens protecting part 30 on the welded part 50 is suppressed. Can be achieved.

  Further, the imaging device 1 described above is acquired in the main body 11 of the imaging unit 10 by connecting to a control device or the like for controlling the welding conditions, or by giving a control function of the welding conditions to the imaging device 1 itself. Control such as changing welding conditions and the like based on the obtained image can be performed. When the imaging device 1 according to the present embodiment is used, the light guide unit 12 and the lens 13 can be arranged around the welded portion 50 even when a sufficient space for arranging the image pickup device cannot be secured around the welded portion 50. It can be set as a simple structure. Therefore, by combining the imaging device 1 and the control device according to the present embodiment, control using the image acquired by the imaging device 1 is possible even with respect to the welding of the welded portion 50 that is limited in the surrounding space. .

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, in the above embodiment, the case where the imaging apparatus 1 is an apparatus that images a welded part in MAG welding has been described. However, the type of welding of an imaging target by the imaging apparatus 1 is not particularly limited.

  Moreover, about said imaging device 1, an optical system etc. can be changed suitably. For example, a wavelength filter that limits the transmission wavelength may be provided in the optical path L1 in the imaging unit 10. By providing the imaging apparatus 1 with a wavelength filter, it is not necessary to consider chromatic aberration, and the optical system of the imaging apparatus 1 can be simplified.

  Further, the structure of the light guide unit 12 that guides light to the main body unit 11 of the imaging unit 10 can be changed as appropriate. When the main body 11 can be disposed close to the welded portion 50, the structure of the light guide 12 can be further simplified and downsized.

  Moreover, it is good also as a structure which provides separately the means to irradiate illumination light with respect to the welding part 50 vicinity. In this case, by illuminating the illumination light, a clear image can be obtained using the illumination light even when the amount of light from the weld 50 is insufficient.

  In the above embodiment, a protective glass for protecting the lens 13 may be separately provided between the lens 13 and the diaphragm member 24. In this case, the branch pipe 34 a that supplies a gas for preventing the scattered matter from scattering into the throttle hole 25 is provided between the protective glass and the throttle hole 25.

  In the above embodiment, the configuration in which the aperture hole 25 is adjusted by the aperture member 24 has been described. However, a configuration in which a pinhole or the like is provided instead of the aperture member 24 may be used.

DESCRIPTION OF SYMBOLS 1 Imaging device 10 Imaging part 11 Main body part 12 Light guide part 13 Lens 16 Base end lens barrel part 17 Intermediate lens barrel part 18 Front end lens barrel part 30 Lens protection part 31 Nozzle support part 32 Connection part 33 Diffuser part 34 Gas supply pipe 34a Branch pipe 35 Gas supply nozzle 36a, 36b Opening 50 Welded part G1 Gas flow G2, G3 Gas

Claims (2)

An imaging unit that captures an image of light from the weld that has entered the lens;
A lens protector provided on an optical path of light from the weld between the lens and the weld;
With
The lens protector is
A gas supply nozzle for ejecting the gas supplied from the gas supply pipe;
A diffuser part that introduces gas from the gas supply nozzle from one end and discharges it from the other end;
A connecting portion that is provided at a position that intersects the optical path and has an opening at a position corresponding to the optical path, and that decompresses the gas ejected from the gas supply nozzle and introduces the gas into the diffuser portion;
An imaging apparatus having   The connecting portion is provided apart from the lens, and the gas supply pipe is provided between the lens and an opening on the lens side of the opening of the connecting portion provided at a position corresponding to the optical path. The imaging device according to claim 1, further comprising a branch pipe that supplies the gas.

Images