JP6529530B2 - Light source unit for UV flaw detector - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a light source unit for an ultraviolet ray for a flaw detection lamp which irradiates ultraviolet rays to an object to be inspected in a flaw detection test.

  As a flaw detection test on the surface of an inspection object such as steel material, a magnetic particle flaw detection test and a penetration flaw detection test which are a kind of nondestructive inspection method are known. The magnetic particle flaw detection test is standardized to JIS Z 2320. In the magnetic particle flaw detection test, a magnetic powder or a magnetic powder solution containing magnetic powder is applied to the surface of an inspection object, and a magnetic field is applied to the inspection object to magnetize the inspection object. When there is a flaw such as a crack on the surface of the magnetized inspection object, the magnetic flux leaks from the flaw. The magnetic powder is attracted to the magnetic flux, and an indication pattern corresponding to the scratch is formed by the magnetic powder. And the flaw as a defect is inspected by observing this magnetic powder indication pattern. In the magnetic particle flaw detection test, there is a fluorescent magnetic particle flaw test using fluorescent magnetic powder in which the surface of the magnetic powder is coated with a fluorescent substance in order to improve the detection accuracy of the flaw.

  The penetration flaw test is standardized in JIS Z 2343. In the penetrant test, first, a penetrant is applied to the surface of the object to be inspected, and the penetrant is allowed to penetrate a flaw such as a crack on the surface. Next, the excess penetrant adhering to the surface is removed, and the developer powder is applied to the surface, and the penetrant infiltrating the wound is drawn to the surface by capillary action. The sucked-in permeate forms an indication pattern corresponding to a wound. Then, a scratch as a defect is inspected by observing the instruction pattern. The penetrant test includes a fluorescent penetrant test using a fluorescent penetrant containing a phosphor to improve the detection accuracy of a flaw.

  In the case of using fluorescent magnetic powder or fluorescent penetrant in the magnetic powder flaw test or penetrant flaw test, it is necessary to irradiate the surface of the inspection object with ultraviolet light to excite the fluorescent magnetic powder or fluorescent penetrant fluid to form the indication pattern is there. Thus, as an ultraviolet ray flaw lamp which irradiates an ultraviolet-ray to a to-be-tested object, what uses ultraviolet-ray LED (Light Emitting Diode) for a light source is known.

  Patent Document 1 shows an ultraviolet flaw detection lamp for illuminating a flaw detection object to be subjected to a penetration flaw test or a magnetic powder flaw detection test with ultraviolet light, and an area narrower than the size of the minimum illumination area to illuminate the flaw detection substance. A plurality of ultraviolet light emitting diodes arranged annularly with the optical axis of the emitted light aligned in one direction, and on each optical axis of the ultraviolet light emitted from the ultraviolet light emitting diodes with a predetermined spread angle A plurality of focusing lenses provided on each of the plurality of focusing lenses for focusing separately the ultraviolet light emitted from the respective ultraviolet light emitting diodes and irradiating the object to be flawed, and a lens support integrally supporting the focusing lenses; With the plurality of condenser lenses positioned on the optical axis of the ultraviolet light emitted from each of the ultraviolet light emitting diodes, the lens support is advanced and retracted in the optical axis direction of the ultraviolet light to irradiate the object to be detected Light Comprising a lens forward and reverse mechanism for varying the size of the region, the ultraviolet flaw lamp irradiates the test object body ultraviolet light respectively condensing superimposed each other are disclosed in the condenser lens.

JP 2011-215077 A

  According to the structure of patent document 1, it is supposed that the illumination intensity of the ultraviolet light which illuminates a to-be-tested body can be raised simply.

  Here, when a large number of inspection objects are subjected to flaw inspection using a penetration flaw test or a magnetic particle flaw test, high intensity ultraviolet rays are repeatedly irradiated at short intervals to improve the efficiency of the examination, or long time It is necessary to irradiate continuously. Under such a use environment, the frequency of replacement of the ultraviolet LED as a light source becomes high. In addition, even a lens made of a material having high resistance to ultraviolet light, such as silicon resin, is deteriorated by long-term use to cause discoloration or the like. Since the deterioration of the lens reduces the intensity of the ultraviolet light applied to the object to be inspected, it is necessary to replace the lens separately from the ultraviolet LED. However, in Patent Document 1, no consideration is given to the maintainability, in particular, the replacement of the ultraviolet LED and the lens.

  Therefore, an object of the present invention is to provide a light source unit for an ultraviolet ray flaw detection lamp which is excellent in maintainability.

In order to solve the above problems, the present invention relates to a light source unit for an ultraviolet flaw detection lamp housed in a housing of an ultraviolet flaw detection lamp for irradiating an ultraviolet ray to an inspection object in a flaw detection test. A support plate to which a substrate is attached, a conical lens disposed opposite to the ultraviolet LED and expanding in diameter toward the other end where ultraviolet light is emitted from one end where the ultraviolet light is incident, and supporting the lens And a fastener for detachably fixing the substrate to the support plate, wherein the support plate is detachably attached to the housing, and the lens is on the side of the ultraviolet LED from the one end. And the first support member has a top portion having a through hole, and the support which extends from the top portion toward the support plate and is supported by the fastener. Anda leg portion fixed to the when the first support member is fixed to the support plate, the lens, the ultraviolet LED having a wall surface is fitted to the rib, the other end the And a cylindrical second support member into which the lens is inserted, and one end of the second support member abuts on the substrate, The other end of the second support member is in contact with a radially outward projecting flange of the lens, and a gap is provided between the rib and the substrate .

Furthermore, the height of the ultraviolet LED is 1.7 mm or more and less than 2.1 mm,
The gap may be 0.9 mm or more and less than 1.4 mm.

Furthermore, it further comprises a heat sink attached to the support plate,
The substrate has a through hole corresponding to the fastener, and is in close contact with the heat sink via an adhesive.
The first support member and the heat sink are detachably fixed to the substrate by the fastener.

Furthermore, the substrate is formed in a circular shape and has two notches whose outer periphery is notched,
The support plate has a circular shape corresponding to the substrate and has a through hole into which the substrate is fitted.
The first support member has three of the legs.
The ultraviolet LED is characterized in that it is a square surface mount type.

According to the present invention, in a light source unit for an ultraviolet ray flaw lamp housed in a housing of an ultraviolet ray flaw lamp for irradiating an ultraviolet ray to an inspection object in a flaw detection test, a substrate on which an ultraviolet LED is mounted and a support plate to which the substrate is attached A conical lens disposed opposite to the ultraviolet LED and expanding in diameter toward the other end where the ultraviolet light is emitted from one end where the ultraviolet light is incident, a first support member for supporting the lens, and A fastener for detachably securing the substrate to the support plate, the support plate being removably attached to the housing, and the lens being an annular rib projecting from the one end to the side of the ultraviolet LED The first support member has a top portion having a through hole, and a leg portion extending from the top portion to the support plate and fixed to the support plate by the fastener. And when the first support member is fixed to the support plate, the lens may be positioned by fitting the ultraviolet LED having a wall surface to the rib, and fitting the other end to the through hole , And further comprising a cylindrical second support member into which the lens is inserted, one end of the second support member abuts against the substrate, and the other end of the second support member has a diameter of the lens Since it abuts against the flange that protrudes outward in the direction, and there is a gap between the rib and the substrate, it is possible to easily replace the substrate on which the ultraviolet LED is mounted and to replace the lens, and maintainability is good. It is possible to provide a light source unit for an ultraviolet ray flaw detection lamp , and further, no force acts on the rib of the lens when fixing the first support member, and breakage of the rib is prevented. In addition, impact resistance is also improved. In addition, incorrect attachment of the lens can be easily prevented, and productivity can be improved.

  Furthermore, since the height of the ultraviolet LED is 1.7 mm or more and less than 2.1 mm, and the gap is 0.9 mm or more and less than 1.4 mm, breakage of a rib or the like is more reliably prevented. . In addition, impact resistance and productivity are further improved.

  Further, the substrate further includes a heat sink attached to the support plate, the substrate has a through hole corresponding to the fastener, is in close contact with the heat sink via an adhesive body, and the first support member and the heat sink Since the fastener is detachably fixed to the substrate by the fastener, it is possible to provide an ultraviolet ray flaw lamp with better maintainability.

  Furthermore, the substrate is formed in a circular shape and has two notches whose outer peripheral portion is notched, and the support plate has a circular shape corresponding to the substrate and has a through hole into which the substrate is fitted. Since the first support member has the three legs, and the ultraviolet LED is a square surface-mounted type, it is possible to provide an ultraviolet ray flaw lamp with better maintainability.

It is the front view in which an example of the ultraviolet ray flaw detection lamp provided with the light source unit for ultraviolet ray flaw detection lamps concerning this embodiment was shown. It is a top view of a ultraviolet ray flaw detection lamp. It is a bottom view of a ultraviolet ray flaw detection lamp. It is the bottom view to which an example of the ultraviolet ray flaw detection lamp in the state where the cover part was opened was shown. It is the disassembled perspective view in which the structure of the light source unit for ultraviolet ray flaw detection lamps which concerns on this embodiment was shown. It is the bottom view in which the light source unit for ultraviolet ray flaw detection lamps was shown. It is the VII-VII sectional view taken on the line of FIG. It is an enlarged view of the lens periphery of FIG. It is sectional drawing in which an example of the state in which the lens was misassembled was shown. It is sectional drawing in which the light source unit for ultraviolet ray flaw detection lamps which concerns on another embodiment was shown.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing an example of a UV flaw detection lamp 1 including a light source unit for a UV flaw detection lamp according to the present embodiment, FIG. 2 is a plan view of the UV flaw detection lamp 1 and FIG. 3 is a UV flaw detection lamp FIG. 4 is a bottom view of FIG. 1, and FIG. 4 is a bottom view showing an example of the ultraviolet ray flaw detection lamp 1 in a state in which the cover 12 is opened. In the following, for convenience of explanation, in FIG. 1, the side of the fixed arm 18 described later is up, the side of the cover 12 described below is down, the front side is front in the drawing, and the back side is back. , The right is the right, the left is the left.

  The ultraviolet ray flaw detection lamp 1 is an ultraviolet ray flaw lamp which irradiates ultraviolet rays to an object to be inspected in a magnetic powder flaw detection test or a penetration flaw detection test. And as shown in FIGS. 1 to 4, the ultraviolet ray flaw detection lamp 1 includes a housing 10 having a main body 11 and a cover 12 and ten light source units for ultraviolet ray flaw detection lamps housed inside the housing 10. A light source unit (hereinafter referred to as a light source unit) 30, four cooling fans 13 for cooling the light source unit 30, and two locking locks 14 for locking the cover 12 to the main body 11 are provided. The light source unit 30 according to the present embodiment includes an ultraviolet LED described later, and is configured to be capable of irradiating ultraviolet light. Then, the ultraviolet ray flaw detection lamp 1 is configured to transmit the ultraviolet rays emitted from the light source unit 30 downward through the cover portion 12.

  The main body portion 11 has four side walls 15 and an upper wall 16, and is formed in an apical square tube shape. The main body portion 11 has a mounting plate 17 inside the lower end side. The mounting plate 17 extends in parallel with the upper wall 16, and the outer peripheral edge is joined to the inner surface of the four side walls 15. Although details will be described later, the mounting plate 17 has a through hole (not shown) corresponding to each light source unit 30. The light source unit 30 is detachably mounted on the mounting plate 17 so as to be fitted into the through hole from the lower side.

  The light source units 30 are arranged to form three rows in a bottom view. In the front and rear rows, three light source units 30 are arranged at substantially equal intervals. In the middle row, four light source units 30 are arranged at substantially equal intervals.

  The cover 12 is connected to the lower end of the main body 11 so as to cover the light source unit 30 from below. Then, the cover unit 12 prevents the adhesion of dust, dust, and the like to the light source unit 30 and the like.

  Two cooling fans 13 are disposed on the front side wall 15 and the rear side wall 15, respectively. The cooling fan 13 is configured to send the outside air into the inside of the main body 11 surrounded by the side wall 15, the upper wall 16, and the mounting plate 17. The ten light source units 30 attached to the mounting plate 17 are cooled by the outside air. In addition, the cooling fan 13 should just be comprised so that the light source unit 30 may be cooled, and the structure, the number, arrangement | positioning, etc. are not specifically limited. For example, the cooling fan 13 disposed on the side wall 15 on the front side is configured to feed outside air into the inside of the main body 11, and the cooling fan 13 disposed on the side wall 15 on the rear side is The air may be discharged to the outside.

  A fixed arm 18 formed by bending a plate-like member in a gate shape in a front view is attached to the upper wall 16. The fixing arm 18 is for fixing the ultraviolet ray detection lamp 1 in a suspended state at a desired position, and has two through holes 19 used for fixing. In addition, the fixing arm 18 should just be a structure which can fix the ultraviolet ray flaw detection lamp 1 in a desired position, and the structure, arrangement | positioning, etc. are not specifically limited.

  Further, the locking lock 14 is disposed on the side wall 15 on the front side. Although details will be described later, the cover 12 is swingably connected to the main body 11. The locking lock 14 is configured to lock the cover portion 12 pivotally connected to the main body portion 11 to the main body portion 11. The locking lock 14 is a so-called patch lock, and locks the cover 12 to the main body 11 by the elastic force of a spring. In addition, the locking lock 14 just locks the cover part 12 to the main-body part 11, and the structure, number, arrangement | positioning, etc. are not specifically limited. For example, the locking lock 14 may be configured to lock the cover 12 to the main body 11 by screw fastening.

  Examples of the material of the main body 11, the mounting plate 17, the fixed arm 18 and the like include aluminum having high thermal conductivity, but it is not particularly limited. Moreover, the main-body part 11 is not limited to the above-mentioned structure. For example, the main body portion 11 may be formed in a topped cylindrical shape. Further, the main body portion 11 may be configured to have an opening in the side wall 15 for sucking in the outside air or discharging the internal air.

  The cover 12 includes a frame 20 having three through holes 22 and an ultraviolet light transmitting member 21 fitted in the respective through holes 22 and covers the lower end of the main body 11 from below. The frame 20 is formed of a plate-like member. The frame 20 is a rectangle whose outer shape corresponds to the outer shape of the lower end of the main body portion 11 in a bottom view. The frame 20 extends along the entire circumference of the outer peripheral end and has a side wall 23 projecting toward the main body 11.

  The through holes 22 of the frame 20 correspond to the light source unit 30, and are formed at the center and at both the left and right. The left and right through holes 22 correspond to three light source units 30, respectively. The central through hole 22 corresponds to the four light source units 30.

  As a material of the frame 20, although aluminum etc. with high thermal conductivity can be illustrated, it is not specifically limited. The ultraviolet ray transmitting member 21 is a plate-like member formed of a material such as quartz glass that is excellent in ultraviolet ray permeability. And the ultraviolet-ray irradiated from the light source unit 30 accommodated in the inside of the housing 10 permeate | transmits the ultraviolet-ray transmission member 21, and is irradiated toward the downward direction.

  The cover 12 is pivotably connected to the main body 11 via two hinges 24. More specifically, one end of the hinge 24 is attached to the rear side wall 23 of the cover 12, and the other end of the hinge 24 is attached to the rear side wall 15 of the main body 11. And as the cover part 12 is shown by FIG. 3, this closed state in which the lower end of the main-body part 11 was closed by this hinge 24 and the lower end of the main-body part 11 are open | released as FIG. 4 shows. It is swingable between the open state where the light source unit 30 is exposed. The cover 12 is locked to the main body 11 by the locking lock 14, whereby the closed state in which the light source unit 30 is covered by the cover 12 is maintained.

  The cover 12 may be configured to close the lower end of the main body 11 and allow ultraviolet light emitted from the light source unit 30 to pass therethrough. For example, the cover 12 may be configured to include the through holes 22 for each of the ten light source units 30.

  Electric power is supplied to the light source unit 30 of the ultraviolet ray flaw detection lamp 1, the cooling fan 13 and the like as a separate body from the housing 10 and from a power supply unit (not shown) connected to an external power supply. The light source unit 30, the cooling fan 13, etc. are driven by the power supplied from the power supply unit. The power supply unit includes a casing in which a CPU, a power supply circuit, and the like are built, a main power switch, an output adjustment dial, and the like. The power supply unit is configured to control the current supplied to the light source unit according to the operation of the output adjustment dial, and to adjust the intensity of the ultraviolet light emitted from the light source unit.

  The configuration of the power supply unit is not particularly limited. For example, the power supply unit may be integrally formed with the housing 10, or may be accommodated in the main body 11 with the main power switch, the output adjustment dial, and the like exposed to the outside. Further, the form of the main power switch, the output control dial, etc. is not particularly limited.

  Next, the light source unit 30 according to the present embodiment will be described in detail. FIG. 5 is an exploded perspective view showing the configuration of the light source unit 30 according to the present embodiment, FIG. 6 is a bottom view showing the light source unit 30, and FIG. 7 is a sectional view taken along line VII-VII in FIG. FIG. 8 is an enlarged view around the lens 34 of FIG. In FIG. 5, the light source unit 30 is shown with the constituent members separated, and the descriptions of the support plate 33 described later, the heat sink 37 described later, and the like are omitted. Further, in FIG. 6, the light source unit 30 is attached to the attachment plate 17 of the main body 11. Moreover, in FIG. 7, the light source unit 30 is mainly shown, and description of the side wall 15 of the main-body part 11, the upper wall 16 grade | etc., Is abbreviate | omitted. 7 and 8, the upper side is the lower side, and the lower side is the upper side.

  As shown in FIGS. 5 to 8, the light source unit 30 includes the substrate 32 on which the ultraviolet LED 31 is mounted, the support plate 33, the lens 34, the first support member 35, the second support member 36, and the heat sink 37 and three fixing screws 38 as fasteners.

  The board | substrate 32 forms the circuit which consists of metal wiring on the insulating board formed from resin etc. which are illustrated by the printed wiring board. The substrate 32 is formed in a substantially circular shape in a bottom view, and a circuit (not shown) is connected to the circuit of the substrate 32. Wiring not shown is connected to the power supply unit in a disconnectable manner via a connector not shown. The ultraviolet LED 31 is mounted at the center of the substrate 32. The ultraviolet LED 31 is a rectangular surface mount LED in a bottom view. The ultraviolet LED 31 has four light emitting elements, is electrically connected to the circuit of the substrate 32, and emits ultraviolet light. The substrate 32 also has two notches 39 whose outer periphery is notched, and three through holes 40 and the like penetrating in the plate thickness direction. The substrate 32 is attached to the support plate 33 via the heat sink 37.

  The support plate 33 is a rectangular plate-like member in a bottom view, and has a circular through hole 54 corresponding to the outer shape of the substrate 32 at the center. A heat sink 37 attached to the substrate 32 is attached to the support plate 33. As a material of the support plate 33, although aluminum etc. with high heat conductivity can be illustrated, it is not specifically limited.

  The lens 34 is disposed to face the ultraviolet LED 31. The lens 34 is a conical lens whose diameter increases from one end (upper end) to the other end (lower end). The lens 34 has a cylindrical recess 41 recessed at one end toward the other end. The bottom surface of the recess 41 is curved so as to expand to one end side which is the side of the ultraviolet LED 31. In addition, the lens 34 has an annular rib 42 projecting from one end to the side (upper side) of the ultraviolet LED 31. The rib 42 is formed in a square ring shape corresponding to the outer shape of the ultraviolet LED 31. Then, the ultraviolet LED 31 is detachably fitted to the rib 42. The lens 34 also has a flange 43 projecting radially outward in the vicinity of the other end. The outer shape of the flange 43 is circular in bottom view. As a material of the lens 34, although a silicone resin etc. which are highly resistant to ultraviolet light and excellent in permeability can be exemplified, it is not particularly limited.

  The inner circumferential surface of the rib 42 may be tapered such that the diameter thereof increases toward the ultraviolet LED 31 (upper side). Such a configuration facilitates fitting of the rib 42 to the ultraviolet LED 31. Preferably, the taper is such that the lens 34 is not inclined with respect to the ultraviolet LED 31 or large rattling occurs when the ultraviolet LED 31 is fitted.

  The ultraviolet light emitted from the ultraviolet LED 31 is incident on the lens 34 from one end. The ultraviolet light incident on the lens 34 is emitted downward from the other end. Most of the ultraviolet light passes through the recess 41 and enters the lens 34 from the bottom of the recess 41. And ultraviolet rays are effectively diffused toward the other end. At the other end of the lens 34, in order to effectively diffuse the emitted ultraviolet light, a concavo-convex process (not shown) is applied.

  The lens 34 is a conical lens disposed opposite to the ultraviolet LED 31 and expanding in diameter from the one end where ultraviolet rays are incident to the other end where the ultraviolet rays are emitted, and the ultraviolet LED 31 is engaged with one end It is sufficient that the rib 42 is provided. The size and shape of the recess 41 formed at one end, the unevenness applied to the other end, and the like are appropriately designed according to the form of the ultraviolet LED 31, the distance between the ultraviolet LED 31 and one end, and the like.

  The first support member 35 supports the lens 34 together with the second support member 36. The first support member 35 is formed by bending a plate-like member. The first support member 35 has a rectangular top portion 44 in a bottom view, and four side portions 45 extending from the outer peripheral edge of the top portion toward the substrate 32 which is the upper side. The top portion 44 has a through hole 46 penetrating in a circular plate thickness direction corresponding to the outer shape of the other end of the lens 34. The other end of the lens 34 is fitted in the through hole 46 of the top portion 44. At this time, the flange 43 of the lens 34 abuts on the top portion 44.

  The left and right both sides and the rear side 45 have legs 47 further extending toward the substrate 32. The ends of the legs 47 are bent outward and abut on the substrate 32 at the time of assembly. At the end of the leg portion 47, a through hole 48 corresponding to the through hole 40 of the substrate 32 and into which the fixing screw 38 is inserted is formed.

  Although stainless steel etc. can be illustrated as a material of the 1st support member 35, It does not specifically limit.

  The first support member 35 is not limited to the above-described configuration. For example, the first support member 35 may be configured to include four legs 47 extending from the front, rear, left, and right sides 45. However, as described above, it is preferable that the first support member 35 be configured to include the three legs 47 disposed substantially at equal intervals in bottom view. With this configuration, the lens 34 can be stably supported. In addition, the number of fixing screws 38 as a fastener does not increase more than necessary, and the number of parts can be reduced. In addition, the time required for fastening the fixing screw 38 is reduced, and the productivity and maintainability of the light source unit 30 are improved.

  The second support member 36 is formed in a cylindrical shape. The inner diameter of the second support member 36 corresponds to the inner diameter of the flange 43. On the other hand, the outer diameter of the second support member 36 corresponds to the outer diameter of the flange 43. Then, the lens 34 is inserted into the second support member 36 from the lower end. One end (upper end) of the second support member 36 abuts on the substrate 32. The other end (lower end) of the second support member 36 abuts on the flange 43 of the lens 34.

  Then, in the lens 34, the flange 43 is sandwiched between the top portion 44 of the first support member 35 and the second support member 36. Further, in the lens 34, the ultraviolet LED 31 is fitted to the rib 42, and the other end is fitted to the through hole 46 and positioned. The lens 34 does not rattle or rotate with respect to the substrate 32. Here, since the lens 34 is not adhered to another member such as the substrate 32 with an adhesive, an adhesive tape, or the like, the trouble of replacing the lens 34 is reduced.

  Here, the length of the second support member 36 is slightly larger than the length from the end of the rib 42 of the lens 34 to the surface of the flange 43 that abuts on the second support member 36. Therefore, a gap CL1 is formed between the rib 42 and the substrate 32, and the lens 34 is supported in a state of being separated from the substrate 32.

  The material of the second support member 36 may be, for example, aluminum having high thermal conductivity, but is not particularly limited.

  The second support member 36 is not limited to the above-described configuration. For example, the second support member 36 may be formed in a square tube shape. In the case of such a configuration, the shape of the flange 43 of the lens 34 may be a shape corresponding to the second support member 36.

  The heat sink 37 is a radiator, and is configured to dissipate heat generated when the ultraviolet LED 31 emits ultraviolet light. The heat sink 37 is formed of a highly thermally conductive material such as aluminum. The heat sink 37 is composed of a rectangular flat base 49 and a plurality of flat projections 50 hanging upward from the base 49. In a bottom view, the outer diameter of the base 49 is larger than the outer diameter of the substrate 32 and smaller than the outer diameter of the support plate 33. The lower side surface of the base 49 is in contact with the upper side surface of the substrate 32 opposite to the side on which the ultraviolet LED 31 is mounted. Further, the lower side surface of the base 49 is in contact with the upper side surface of the support plate 33 with the outer peripheral portion than the substrate 32. The heat sink 37 is a peripheral portion outside the substrate 32 of the base 49, and the four corners are fastened to the support plate 33 by the fixing screws 51. That is, the heat sink 37 is detachably attached to the upper side of the support plate 33.

  Here, an adhesive body 52 is interposed between the lower surface of the base 49 and the upper surface of the substrate 32. That is, the substrate 32 is in close contact with the base 49 of the heat sink 37 via the adhesive 52. The adhesive body 52 has adhesiveness (adhesive strength) that allows the operator to easily peel off the substrate 32 from the base 49 without the substrate 32 being peeled off from the base 49 by its own weight. As the adhesive body 52, for example, a heat dissipation grease excellent in thermal conductivity can be used. With such a configuration, the cooling efficiency of the ultraviolet LED 31 is improved. The substrate 32 and the base 49 of the heat sink 37 may be in direct contact with each other without the adhesive body 52 interposed therebetween.

  In addition, the heat sink 37 should just be a structure which can thermally radiate the heat | fever which arises when ultraviolet-ray LED 31 light-emits an ultraviolet-ray, The structure is not specifically limited. The number, size, shape, etc. of the protrusions 50 can be designed as appropriate.

  The fixing screw 38 as a fastener is a so-called male screw including a head and a shaft having a screw. The first support member 35 and the heat sink 37 are detachably fixed to the substrate 32 by a fixing screw 38 as a fastener. More specifically, the fixing screw 38 is inserted into the through hole 48 of the leg portion 47 of the first support portion and the through hole 40 of the substrate 32 and screwed into the unshown female screw portion of the base 49 of the heat sink 37 Ru. Then, the end of the leg 47 of the first support member 35 and the base 49 of the heat sink 37 are fastened to the substrate 32.

  At this time, the lens 34 is pressed against the substrate 32 by the first support member 35, and the second support member 36 is pressed against the substrate 32. Then, the lens 34, the first support member 35, the second support member 36, and the heat sink 37 are fixed to the substrate 32. Since the heat sink 37 is fastened to the support plate 33, the substrate 32, the lens 34, the first support member 35, and the second support member 36 are fixed to the support plate 33 via the heat sink 37. .

  The fastener may have any configuration as long as the end of the leg 47 and the base 49 can be fastened to the substrate 32. The fastener may be, for example, a removable resin rivet or the like.

  The light source unit 30 configured as described above is detachably attached to the attachment plate 17 of the main body 11 by screw fastening. More specifically, the mounting plate 17 has a rectangular through hole 25 corresponding to the base 49 of the heat sink 37. The heat sink 37 is inserted into the through hole 25 from the lower side, and the lower surface of the mounting plate 17 and the upper surface of the outer peripheral edge portion of the support plate 33 are in close contact. Then, the outer peripheral edge portion of the support plate 33 is fastened to the mounting plate 17 by two mounting screws 53 as a mounting tool. At this time, since the support plate 33 is larger than the base 49 of the heat sink 37, the through holes 25 of the mounting plate 17 are closed by the light source unit 30. The mounting screw 53, like the fixing screw 38, is a so-called male screw. The head of the mounting screw 53 is formed larger than the head of the fixing screw 38 so that it can be tightened by the hand of the operator without using a tool. Therefore, the light source unit 30 is easily desorbed from the mounting plate 17, and is excellent in maintainability.

  Here, the light source unit 30 is removed by releasing the locking of the cover 12 to the main body 11 by the locking lock 14 and swinging the cover 12 so that the lower end of the main body 11 is opened. To be done. The locking lock 14 is a patch lock, and does not require a tool or the like. Therefore, the ultraviolet ray flaw detection lamp 1 is easy to desorb the light source unit 30, and is excellent in maintainability.

  In addition, the attachment should just be a structure which can attach the light source unit 30 to the attachment plate 17 of the main-body part 11 so that attachment or detachment is possible. The fixture may be, for example, a removable resin rivet or the like.

  Next, an example of an assembly procedure of the light source unit 30 will be described in detail. First, the heat sink 37 is disposed so that the base portion 49 is on the upper side and the protrusion 50 is on the lower side. The support plate 33 is closely attached onto the base 49, and the base 49 is fastened to the support plate 33 by the fixing screw 51.

  Next, an adhesive 52 is applied to the surface of the substrate 32 opposite to the side on which the ultraviolet LED 31 is mounted. The substrate 32 is fitted in the through hole 54 of the support plate 33 such that the surface of the substrate 32 to which the adhesive 52 is applied is in close contact with the base 49 of the heat sink 37. Therefore, a large step is not formed between the substrate 32 and the support plate 33, and the productivity and the maintainability are unlikely to be reduced. At this time, the substrate 32 is disposed so that the through holes 40 of the substrate 32 match the unshown female screw portions of the heat sink 37. In order to reduce the difference in level between the substrate 32 and the support plate 33, it is preferable to make the thickness of the substrate 32 and the thickness of the support plate 33 approximately the same.

  Next, the second support member 36 is disposed on the substrate 32 so that the ultraviolet LED 31 is positioned on the cylinder axis of the second support member 36.

  Next, the lens 34 is inserted into the second support member 36 from the side where the rib 42 is located. Then, the ultraviolet LED 31 is fitted to the rib 42. Here, whether or not the rib 42 is fitted to the ultraviolet LED 31 can be easily determined by the gap CL2 formed between the other end of the second support member 36 and the flange 43 of the lens 34. Therefore, incorrect assembly of the lens 34 can be easily prevented, and the productivity is improved.

  More specifically, when the rib 42 is not fitted to the ultraviolet LED 31, for example, as shown in FIG. 9, the end of the rib 42 abuts on the ultraviolet LED 31. Then, a gap CL2 is formed between the other end of the second support member 36 and the flange 43 of the lens 34. This gap CL2 makes it possible to determine whether the rib 42 is fitted to the ultraviolet LED 31 or not. 9 is a cross-sectional view showing an example of a state in which the lens 34 is assembled incorrectly, and is a vertical cross-sectional view showing the periphery of the lens 34 as in FIG.

  Here, the second support member 36 is not fixed. Therefore, the ultraviolet LED 31 can be fitted to the rib 42 while moving the second support member 36 and the lens 34, so that an excessive force hardly acts on the rib 42, and breakage of the rib 42 is suppressed.

  The rib 42 may not be in contact with the ultraviolet LED 31 when the rib 42 is not fitted to the ultraviolet LED 31, that is, the cylinder axis of the second support member 36 may be largely deviated from the ultraviolet LED 31. In such a state, the gap CL2 is not formed between the other end of the second support member 36 and the flange 43 of the lens 34. However, in such a state, the lens 34 and the second support member 36 move without being fixed to the substrate 32. Therefore, even in such a state, it can be easily recognized that the rib 42 is not fitted to the ultraviolet LED 31.

  Next, the first support member 35 is placed on the lens 34 and the second support member 36 from above. Then, the other end of the lens 34 is fitted in the through hole 46 of the top portion 44. At this time, since the rib 42 of the lens 34 is fitted to the ultraviolet LED 31, the lens 34 and the second support member 36 are positioned and do not move significantly. Therefore, the other end of the lens 34 can be easily fitted in the through hole 46 of the top portion 44. The first support member 35 is disposed such that the through holes 48 of the legs 47 coincide with the through holes 40 of the substrate 32.

  Next, the fixing screw 38 is inserted into the through hole 48 of the leg portion 47 of the first support portion and the through hole 40 of the substrate 32 and screwed into the unshown female screw portion of the base 49 of the heat sink 37. The lens 34 is pressed against the substrate 32 by the first support member 35, and the second support member 36 is pressed against the substrate 32. Then, the lens 34, the first support member 35, the second support member 36, and the heat sink 37 are fixed to the substrate 32, and the light source unit 30 is assembled.

  In the lens 34, the ultraviolet LED 31 is fitted to the rib 42, and the other end is fitted to the through hole 46 and positioned. Therefore, the lens 34 does not rattle or rotate with respect to the substrate 32.

  Here, the light source unit 30 can fix the lens 34, the first support member 35, the second support member 36, and the heat sink 37 to the substrate 32 by fastening the three fixing screws 38. Therefore, the assembling operation is easy, the number of parts for fixing is small, and the productivity is good.

  Further, the length of the second support member 36 is slightly larger than the length from the end of the rib 42 of the lens 34 to the surface of the flange 43 that abuts on the second support member 36. A gap CL1 is formed therebetween. Therefore, no force is exerted on the rib 42 by the fastening of the fixing screw 38, and breakage of the rib 42 is prevented without reinforcing the rib 42 so as to be thick. In addition, an increase in weight of the lens 34 is prevented.

  In addition, even if the light source unit 30 is subjected to an impact such as vibration or falling, the rib 42 does not collide with the substrate 32 to be damaged, and the impact resistance is improved. In addition, when vibration or an impact in the radial direction of the lens 34 is applied to the light source unit 30, the rib 42 may collide with the ultraviolet LED 31, but the impact can be absorbed by bending radially outward. Damage is prevented. In addition, the light source unit 30 can improve impact resistance without using a buffer member or the like, and productivity can be improved.

  From the viewpoint of protection of the rib 42 and positioning of the lens 34, when the height H (see FIG. 8) of the ultraviolet LED is 1.7 mm or more and less than 2.1 mm, the gap CL1 is 0.9 mm or more; Preferably it is less than 4 mm. The height H of the ultraviolet LED 31 is the distance from the surface of the substrate 32 on which the ultraviolet LED 31 is mounted to the end of the lens 34 of the ultraviolet LED 31. The ultraviolet LED 31 is connected to the circuit of the substrate 32 by solder. The solder may protrude laterally (outward) from the end of the ultraviolet LED 31 on the side of the substrate 32. If the gap CL1 is less than 0.9 mm, when the light source unit 30 is subjected to an impact such as a drop, the rib 42 may abut against the solder projecting laterally, and may be damaged. The durability of the On the other hand, when the clearance CL1 is 1.4 mm or more, the fitting of the rib 42 to the ultraviolet LED 31 is easily released, and the lens 34 is difficult to be positioned. Then, the productivity and the maintainability of the light source unit 30 are reduced.

  Next, an example of the disassembly procedure at the time of maintenance of the light source unit 30 will be described in detail. The disassembling procedure of the light source unit 30 is substantially the reverse of the assembling described above. The lens 34, the first support member 35 and the second support member 36 are removed from the substrate 32 simply by removing the fixing screw 38 from the heat sink 37. Therefore, in the light source unit 30, the lens 34, the first support member 35, and the second support member 36 can be easily removed, and the time for replacing the lens 34, the first support member 35, and the second support member 36 can be shortened. Maintenance is good.

  In addition, since the substrate 32 is in close contact with the base 49 of the heat sink 37 via the adhesive 52, even when the fixing screw 38 is removed, the substrate 32 remains attached to the heat sink 37. Then, in the replacement work of the lens 34 and the like, there is no need to perform the work relating to the attachment of the substrate 32 when assembling the light source unit 30 after replacement. Therefore, the time for replacing the lens 34 and the like can be shortened, and the maintainability is good.

  In addition, when replacing | exchanging the board | substrate 32 (ultraviolet LED31), tools and nail | claws, such as a driver, are hooked on the notch part 39, and the board | substrate 32 is peeled off from the heat sink 37. FIG. In addition, since the adhesiveness of the adhesive body 52 is a grade which can be peeled off easily, maintenance property does not deteriorate.

  The light source unit 30 is not limited to the above-described configuration. The light source unit 30 may be configured not to include the second support member 36, as shown in FIG. 10, for example. Here, FIG. 10 is a cross-sectional view showing a light source unit 130 according to another embodiment, and is a vertical cross-sectional view showing the periphery of the lens 134 as in FIG. 8 and FIG. The light source unit 130 according to another embodiment does not include the second support member 36 in the light source unit 30 described above, and has a configuration in which the shape of the rib 42 of the lens 34 is different. The configuration is the same, and the description of the same configuration is omitted.

  The lens 134 in the light source unit 130 is configured such that the end of the rib 142 abuts on the substrate 32. That is, the lens 134 is pressed against the substrate 32 by the first support member 35, and is held between the first support member 35 and the substrate 32. Such a configuration reduces the number of parts and improves productivity. Even in such a configuration, the lens 34 and the first support member 35 can be removed from the substrate 32 simply by removing the fixing screw 38 from the heat sink 37, so that the maintainability is good.

  A force acts on the rib 142 by the fastening of the fixing screw 38. Therefore, the thickness of the rib 142 is set so as not to be damaged by the force of the fastening of the fixing screw 38.

  The light source unit 30 may not have the heat sink 37. In the case of such a configuration, the substrate 32 is configured such that the surface opposite to the side on which the ultraviolet LED 31 is mounted is in close contact with the support plate 33. Further, the first support member 35 and the substrate 32 are configured to be detachably fixed to the support plate 33 by the fixing screw 38. Even in such a configuration, the substrate 32, the lens 34, and the first support member 35 can be removed from the support plate 33 only by removing the fixing screw 38 from the support plate 33, so that the maintainability is good.

  Further, the substrate 32 may have a configuration in which the ultraviolet LED 31 is mounted, and is not limited to the above configuration. The substrate 32 may be formed, for example, in a rectangular shape in a bottom view. Further, the ultraviolet LED 31 only needs to be configured to emit ultraviolet light, and is not limited to the above-described configuration. The ultraviolet LEDs 31 may be, for example, circular in a bottom view, and the number of light emitting elements provided can be appropriately designed. However, from the viewpoint of positioning of the lens 34, the ultraviolet LED 31 is preferably a surface-mounted LED, and is preferably polygonal in bottom view. In particular, it is preferable that the ultraviolet LED 31 has four light emitting elements arranged to form a square, and is a square surface mounted type corresponding to the square formed by the four light emitting elements. With such a configuration, when the rib 42 of the lens 34 is fitted to the ultraviolet LED 31, it is not necessary to consider the circumferential direction of the lens 34 with respect to the ultraviolet LED 31, and the productivity and the maintainability are improved. In addition, the intensity of the ultraviolet light emitted from the lens 34 can be easily equalized.

  In addition, the light source unit 30 is not limited by the size, and can be appropriately designed according to the shape, output and the like of the ultraviolet LED 31.

  Moreover, the ultraviolet ray flaw detection lamp 1 should just be a structure provided with the light source unit 30, and is not limited to the above-mentioned structure. The number, arrangement, and the like of the light source units 30 are appropriately set. Furthermore, the ultraviolet ray flaw detection lamp 1 may be configured to be remotely operable by an external device.

  In addition, the ultraviolet ray flaw detection lamp 1 is not limited by the size, and can be appropriately designed. The ultraviolet ray flaw detection lamp 1 may be of a portable size, and may be configured to include, for example, a grip held by a worker.

  As described above, the light source unit 30 according to the present embodiment is housed in the housing 10 of the ultraviolet ray flaw lamp 1 that irradiates ultraviolet rays to the inspection object in the flaw detection test, and the substrate 32 on which the ultraviolet LED 31 is mounted. A support plate 33 to which the substrate 32 is attached, a conical lens 34 disposed opposite to the ultraviolet LED 31 and having a diameter increased from one end where ultraviolet rays are incident toward the other end where ultraviolet rays are emitted, The first support member 35 for supporting and the fixing screw 38 for detachably fixing the first support member 35 to the support plate 33 are provided. The support plate 33 is detachably attached to the housing 10, and the lens 34 is The first support member 35 has a top 44 having a through hole 46 and a top 44 to a support plate 33 having an annular rib 42 projecting from the one end to the side of the ultraviolet LED 31. And the legs 34 fixed to the support plate 33 by the fixing screws 38, and when the first support member 35 is fixed to the support plate 33, the lens 34 has the rib 42 fitted with the ultraviolet LED 31. The other end is fitted into the through hole 46 and positioned.

  Then, according to the present embodiment, it is possible to provide the light source unit 30 for an ultraviolet ray flaw detection lamp, which is excellent in maintainability.

  The present disclosure can be suitably used for a light source unit for an ultraviolet flaw detection lamp that irradiates ultraviolet rays to an object to be inspected in a flaw detection test, and in particular, the object to be inspected in fluorescent magnetic powder flaw detection test and fluorescence penetration flaw detection test is irradiated with ultraviolet rays. It is useful for the light source unit for ultraviolet flaw detection lamps.

DESCRIPTION OF SYMBOLS 1 UV flaw detection 10 housing 30,130 light source unit (light source unit for ultraviolet flaw detection lights)
31 UV LED
32 substrate 33 support plate 34 lens 35 first support member 36 second support member 37 heat sink 38 fixing screw (fastener)
39 Notched part 40 Through hole 42, 142 Rib 43 Flange 44 Top part 46 Through hole 47 Leg 52 Sticky body 54 Through hole CL1 Gap between rib and substrate H Height of UV LED

Claims (4)

In a light source unit for an ultraviolet flaw detection lamp housed in a housing of an ultraviolet ray flaw detection lamp for irradiating an ultraviolet ray to an inspection object in a flaw detection test,
A substrate on which an ultraviolet LED is mounted,
A support plate to which the substrate is attached;
A conical lens disposed opposite to the ultraviolet LED and expanding in diameter from the one end where the ultraviolet light is incident toward the other end where the ultraviolet light is emitted;
A first support member for supporting the lens;
A fastener for removably securing the substrate to the support plate;
Equipped with
The support plate is removably attached to the housing,
The lens has an annular rib projecting from the one end toward the ultraviolet LED.
The first support member has a top portion having a through hole, and a leg portion extending from the top portion to the support plate and fixed to the support plate by the fastener.
When the first support member is fixed to the support plate, the lens may be positioned such that the ultraviolet LED having a wall surface is fitted to the rib, and the other end is fitted to the through hole. and wherein,
It further comprises a cylindrical second support member into which the lens is inserted,
One end of the second support member is in contact with the substrate,
The other end of the second support member is in contact with a radially outwardly projecting flange of the lens,
A gap is provided between the rib and the substrate ,
Light source unit for UV flaw detector. The height of the ultraviolet LED is 1.7 mm or more and less than 2.1 mm,
The gap is 0.9 mm or more and less than 1.4 mm.
The light source unit for an ultraviolet ray flaw detection lamp according to claim 1 . It further comprises a heat sink attached to the support plate,
The substrate has a through hole corresponding to the fastener, and is in close contact with the heat sink via an adhesive.
The first support member and the heat sink are detachably fixed to the substrate by the fastener.
The light source unit for an ultraviolet ray flaw lamp according to any one of claims 1 to 2 . The substrate is formed in a circular shape and has two notches whose outer periphery is notched,
The support plate has a circular shape corresponding to the substrate and has a through hole into which the substrate is fitted.
The first support member has three of the legs.
The ultraviolet LED is characterized in that it is a square surface mount type.
The light source unit for an ultraviolet ray flaw detection lamp according to claim 3 .

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