JP2010165550A - Illuminating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminating device with easy exchange of an LED and without airtightness inside the device damaged upon the exchange and re-assembling. <P>SOLUTION: The illuminating device is provided with a printed circuit board 14, a high-intensity LED 14c, a translucent cylindrical case 10, end-part metal members 21, 22 sealing openings of both ends 10a, 10b of the cylindrical case 10, a heat dissipation board 11 for the high-intensity LED 14c, and packings 20, 20 interposed between the both ends 10a, 10b and the end-part metal members 21, 22 of the cylindrical case 10, with the heat dissipation board 11 jointed to the printed circuit board 14. A contact board part 11c in plane contact with a rear face 22d of the end-part metal member 22 is provided at an end of the heat dissipation board 11, a groove 21g is formed on a rear face 21d of the end-part metal member 21, the other end 11d of the heat dissipation board 11 is made inserted into the groove 21g, and both end openings of the cylindrical case 10 are sealed with the end-part metal members 21, 22 by fastening lid members 21, 22 with a whole screw 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lighting device including a printed circuit board on which an LED is mounted and a heat radiating member for radiating heat generated from the LED.

  Conventionally, for example, as a lighting device that illuminates the inside of a machine tool, a lighting device that incorporates a fluorescent lamp and has a waterproof and dustproof structure that does not allow dust or water to enter the device is generally used.

  This illuminating device uses a fluorescent lamp as a light source, and the life of the fluorescent lamp is shorter than that of the machine tool body, so that the fluorescent lamp needs to be replaced. The fluorescent tube of a fluorescent lamp contains harmful substances and is easy to break. Therefore, when this lighting device is attached at a high place, the replacement work itself is a dangerous work.

  Therefore, an illumination device using an LED as a light source instead of a fluorescent lamp has come to be used.

  There are two types of lighting devices, a box type and a cylindrical type. The box type has a transparent surface and allows LED light to pass therethrough, so that the irradiation angle is limited. In order to widen this irradiation angle, the illumination device itself must be enlarged.

  In addition, since the irradiation angle is limited for the box type, the irradiation direction is determined. For this reason, when the illuminating device is mounted in the machine tool, the mounting position is surely obtained. Mounting brackets must be designed according to

For this reason, a cylindrical shape is preferred (for example, see Patent Document 1).
The illuminating device of Patent Document 1 has a cylindrical portion that is open at both ends, and the opening at both ends is closed by a positioning sleeve. The inside of the cylindrical portion is a sealed space, and a cylindrical mounting base portion that is divided in half into the sealed space of the cylindrical portion is disposed. A rectangular heat radiating plate is provided along the opening surface inside the mounting base, and both side edges of the heat radiating plate are supported by the inner wall surface of the mounting base. A printed circuit board is bonded to the upper surface of the heat radiating plate, and an LED is mounted on the printed circuit board. Also, a halved diffraction grating is provided at the top of the mounting base to spread the illumination light emitted from the LED.

Utility Model Registration No. 3121894

  However, the cylindrical lighting device of Patent Document 1 has a complicated structure inside the lighting device and cannot be easily replaced. In addition, once disassembled for LED replacement, it cannot be easily assembled correctly. There is a problem that the airtightness inside the apparatus is lost.

    The present invention has been made paying attention to the above problem, and an object of the present invention is to provide an illumination device in which the LED can be easily replaced and the airtightness inside the device is not impaired even if the LED is reassembled by this replacement.

In order to achieve the above object, according to the present invention, a printed circuit board, light emitting means mounted on the printed circuit board, a light-transmitting cylinder in which the printed circuit board and the light emitting means are arranged and both ends are opened. A cylindrical case, a pair of lid members for closing the opening at both ends of the cylindrical case and sealing the inside thereof, a heat radiating plate for radiating heat generated by the light emitting means, both ends of the cylindrical case and the pair A lighting device comprising a gasket interposed between the lid member and the heat sink bonded to the printed circuit board,
An abutting plate portion in surface contact with one back surface of the lid member is provided at one end of the heat radiating plate,
Forming a groove on the other back surface of the lid member, and inserting the other end of the heat sink into the groove;
One lid member and the other lid member of the cylindrical case are fastened by fastening means, and both ends of the cylindrical case are sealed with the pair of lid members.

  According to this invention, it is easy to replace the LED, and even if it is reassembled by this replacement, the airtightness inside the apparatus is not impaired.

It is a perspective view of the illuminating device of Example 1. FIG. It is sectional drawing of the illuminating device which follows the KK line | wire of FIG. It is a disassembled perspective view of the illuminating device of Example 1. FIG. (A) It is sectional drawing of the edge part metal member 21 in alignment with the M1-M1 line | wire of FIG. (B) It is sectional drawing of the edge part metal member 21 in alignment with the M2-M2 line | wire of FIG. 2A is a front view of an end metal member 21. FIG. (B) It is a rear view of the end metal member 21. (A) It is sectional drawing of the edge part metal member 22 which follows the L1-L1 line | wire of FIG. (B) It is sectional drawing of the edge part metal member 22 which follows the L2-L2 line | wire of FIG. (A) It is a front view of the edge part metal member 22. FIG. FIG. 4B is a rear view of the end metal member 22. It is a figure which shows the cross section of the illuminating device of Example 1. FIG. The illuminating device 200 of Example 2 is shown. It is a perspective view which shows (a) end metal member 210 and (b) end metal member 220 of Example 2. The illuminating device 300 of Example 3 is shown. It is a perspective view which shows (a) end metal member 211 and (b) end metal member 221 of Example 3.

  Hereinafter, the best mode for realizing the illumination device of the present invention will be described based on Examples 1 to 3 shown in the drawings.

  First, the structure of the illuminating device of Example 1 which concerns on this invention is demonstrated.

  As shown in FIGS. 1 to 3, the illumination device 100 according to the first embodiment includes a printed circuit board 14, high-intensity LEDs (light emitting means) 14 c mounted on the printed circuit board 14, A heat radiating plate 11 for radiating heat generated from the luminance LEDs 14c,... A pair of cylindrical cases 10 having both ends opened, and a pair of sealing the inside by closing the openings 10a, 10b of the cylindrical case 10 End metal members (lid members) 21 and 22, packings 20 and 20 interposed between both ends of the cylindrical case 10 and a pair of end metal members, and a pair of end metal members 21 and 22 are fastened. All the screw members 13 and 13, waterproof washers zk,..., Nuts N1,. A fastening member is constituted by the entire screw member 13, the waterproof washer zk and the nut N1.

  The length of the printed circuit board 14 in the longitudinal direction is set shorter than that of the cylindrical case 10, and the width thereof is set slightly smaller than the inner diameter of the cylindrical case 10.

  Further, a plurality of screw holes 14f,... Are formed in the printed circuit board 14 at predetermined intervals. A plurality of high-brightness LEDs 14c,... Are mounted on the printed circuit board 14 at predetermined intervals.

  At the left end in the longitudinal direction of the printed circuit board 14 (in FIG. 3), a power cable connector 14e is provided.

  The heat radiating plate 11 is made of a metal such as aluminum or iron, and has a rectangular flat plate portion 11a and a disc-shaped contact plate portion 11c integrally formed at one end thereof. The length of the flat plate portion 11a is set longer than that of the cylindrical case 10, and the width thereof is set to be substantially the same as that of the printed circuit board 14.

  The heat sink 11 is formed with screw holes 11b,... At positions corresponding to the plurality of screw holes 14f of the printed circuit board 14. Further, screw holes 11e,... Are formed in the contact plate portion 11c of the heat radiating plate 11.

  The entire screw member 13 is made of stainless steel and has a rod shape with a circular cross section. Further, male screws 13b and 13b are cut at both ends.

  The end metal member 21 is made of a metal such as aluminum or iron, and has a circular lid portion 21 a that closes the opening of the cylindrical case 10 as shown in FIGS. 3, 4, and 5. An annular groove 21 e is formed on the right side surface 21 d of the end metal member 21.

  The inner diameter of the annular groove 21 e is set substantially the same as the inner diameter of the cylindrical case 10. The outer diameter of the annular groove 21 e is set to be substantially the same as the outer diameter of the cylindrical case 10. A packing 20 shown in FIG. 3 is provided in the annular groove 21e (see FIG. 2).

  In addition, through holes 21f and 21f that pass through the lid portion 21a and have substantially the same diameter as the entire screw 13 are formed on the inner side of the annular groove 21e on the right side surface 21d (in FIG. 4) of the lid portion 21a.

  Further, on the right side surface 21d (in FIG. 4), a groove 21g into which the end portion 11d (left side in FIG. 2) of the heat sink 11 is fitted is formed inside the through holes 21f and 21f. The lid portion 21a is formed with a through hole 21h for inserting a plug mounting bracket 16 to be described later.

  The end metal member 22 is made of a metal such as aluminum or iron, and has a circular lid portion 22 a that closes the opening 10 b of the cylindrical case 10 as shown in FIGS. 3, 6, and 7.

  An annular groove 22e is formed on the left side surface 22d (in FIG. 6) of the end metal member 22. The inner diameter of the annular groove 22 e is set to be substantially the same as the inner diameter of the cylindrical case 10. The outer diameter of the annular groove 22 e is set to be substantially the same as the outer diameter of the cylindrical case 10. The packing 20 shown in FIG. 3 is provided in the annular groove 22e (see FIG. 2).

  Further, on the left side surface 22d of the lid portion 22a, through holes 22f and 22f having substantially the same diameter as the entire screw 13 are formed through the lid portion 22a in a portion inside the annular groove 22e.

  Further, on the left side surface 22d (in FIG. 6), screw holes 22g,... Are formed on the inner side of the annular groove 22e so as to coincide with the screw holes 11e,. ing.

  As shown in FIG. 3, the plug mounting bracket 16 has a small-diameter fitting portion 16 a that fits into the through hole 21 h of the end metal member 21. The plug mounting bracket 16 is formed with a through hole 16c through which the power supply cable 17 is passed.

  The washer zk described above is of a type that exhibits waterproofness by contacting both the end metal members 21, 22 and the male screw 13b of the entire screw member 13, that is, a metal member.

  As described above, the heat radiating plate 11, the entire screw member 13, and the end metal members 21 and 22 are made of metal such as stainless steel, aluminum, or iron, but have high thermal conductivity and formability. The material is not limited to the above.

  Next, assembly of the illumination device of the present embodiment will be described with reference to FIG.

The lower surface 14b of the printed circuit board 14 is joined to the upper surface 11g of the flat plate portion 11a of the heat radiating plate 11 and screwed. The screw holes 11e, 11e of the contact plate portion 11c of the heat radiating plate 11 are aligned with the screw holes 22g, ... of the end metal member 22, and the contact plate portion 11c is joined to the left side surface 22d of the end metal member 22. And fix with screws N.
One male screw 13 b, 13 b of all the screw members 13, 13 is inserted into the through holes 22 f, 22 f of the end metal member 22, and the portion of the male screw 13 b of all the screw members 13, 13 is inserted into the end metal member 22. Project from the right side 22c. The nuts N1 and N1 are screwed into the protruding male screws 13b and 13b through waterproof washers zk and zk.

  Next, as shown in FIGS. 1 to 3, all the screw members 13, 13, the heat sink 11 and the printed circuit board 14 are inserted into the cylindrical case 10. Then, one end 10 b of the cylindrical case 10 is inserted into the annular groove 22 e of the end metal member 22 to which the packing 20 is attached, and the one end 10 b of the cylindrical case 10 is brought into contact with the packing 20. Then, the end portion 11 d (left side in FIG. 2) of the heat radiating member 11 and the male screw 13 b (left side in FIG. 2) of the entire screw member 13 protrude from the opening of the other end 10 a of the cylindrical case 10.

  Thereafter, the fitting portion 16 a of the plug mounting bracket 16 is attached to the through hole 21 h of the end metal member 21, and the feeder 17 is connected to the through hole 16 c of the plug mounting bracket 16 and the through hole 21 h of the end metal member 21. And connect to the connector 14e.

The end (left side in FIG. 2) of the heat radiating plate 11 protruding from the opening of the other end 10a of the cylindrical case 10 is inserted into the groove 21g of the end metal member 21, and the male screws 13b and 13b of all the screw members 13 and 13 are inserted. (Left side in FIG. 2) is inserted into the through holes 21 f and 21 f of the end metal member 21 and protruded from the left side surface 21 c of the end metal member 21. The nuts N1, N1 are screwed and tightened to the protruding male screws 13b, 13b through waterproof washers zk, zk. At this time, the packing of the washer zk bites into the male thread portion of all the screws 13.
When the nuts N1 and N1 are tightened, the end metal members 21 and 22 are fastened to each other through all the screw members 13 and 13, both ends 10a and 10b of the cylindrical case 10 are in close contact with the packings 20 and 20, and end metal The through holes 21f, 21f, 22f, 22f of the members 21, 22 are closed by washers zk,..., And the inside of the cylindrical case 10 is sealed. Moreover, all the screw members 13 and 13 contact | abut on the left-right both sides | surfaces of the heat sink 11 (refer FIG. 5).

  Further, by tightening the nuts N1 and N1, the heat sink 11 is sandwiched between the end metal members 21 and 22, and the end surface of the other end 11d (left side in FIG. 2) of the heat sink 11 enters the groove 21g. Go. The tightening of the nut N1 is adjusted so that the packings 20, 20 are pressed appropriately.

  As shown in FIG. 2, when the assembly of the illuminating device 100 is completed, the illuminating device 100 is moved to a predetermined position inside the machine tool by a not-shown annular metal fitting, for example, in the direction in which the axis of the cylindrical case 10 is along the vertical direction Install so that it becomes.

Next, the operation of the illumination device 100 of this embodiment will be described with reference to FIGS. 1 and 2.
According to this illuminating device 100, the inside of the cylindrical case 10 can be endped only by screwing the nuts N1 and N1 onto the male screws 13b and 13b of the all screw members 13 protruding from the end metal members 21 and 22 and tightening them. The metal members 21 and 22 can be easily and reliably sealed.
Since a gap is generated between the end portion 11d and the deep wall (bottom portion) of the groove 21g in a state where the lighting device 100 is assembled, a manufacturing error of the lighting device 100 can be absorbed by the gap.
Furthermore, since the other end 11d of the heat radiating plate 11 can enter the gap, the tightening degree of the nut N1 can be freely changed so as to obtain an optimum surface pressure for the packings 20 and 20. In addition, by tightening so as to obtain an optimum surface pressure, it is possible to ensure waterproofness of the lighting device 100 and to prevent damage due to a difference in thermal expansion coefficient between the cylindrical case 10 and the heat radiating plate 11.
Moreover, since the inside of the cylindrical case 10 is sealed by the end metal members 21 and 22 with the whole screw member 13 and the nuts N1 and N1, the sealing structure is very simple.
Since all screw members 13 are disposed adjacent to the left and right sides of the heat sink 11 (see FIG. 8), vibration of the heat sink 11 is prevented. That is, the vibration of the printed circuit board 14 in the left-right direction is prevented.
By providing another printed circuit board 14 on the lower surface 11b of the heat radiating plate 11, illumination in both the upper and lower directions (in FIG. 8) is also possible.
When replacing the high-intensity LED 14c, the plug mounting bracket 16 is first removed from the fitting portion 16a. As a result, the packing on the inner surface of the through hole 16c of the plug mounting bracket 16 is loosened, and the end metal member 21 can be moved with respect to the cable of the feeder line 17, so the nuts N1, N1 on the end metal member 21 side are provided. And the end metal member 21 is removed from the cylindrical case 10, and the feeder line 17 is removed from the connector 14 e of the printed circuit board 14.
Next, the metal tube member 22 is removed from the right end portion (in FIG. 2) of the cylindrical case 10 and the printed circuit board 14 is pulled out from the cylindrical case 10 together with the heat radiating plate 11 and all the screw members 13 and 13.
Then, the high-intensity LED 14c is replaced. As described above, the high-brightness LED 14c can be replaced by removing the plug mounting bracket 16 and the nuts N1 and N1 and pulling out the printed circuit board 14, the heat sink 11 and the entire screw member 13 from the cylindrical case 10. Can be done easily.
Thereafter, if the high-intensity LED 14c is replaced and then assembled as described above, the inside of the cylindrical case 10 can be reliably sealed, and the cylindrical case 10 is sealed by re-assembly when the high-intensity LED 14c is replaced. Will not be damaged. Here, since the packing of the washer zk is irreversibly deformed and does not maintain the initial shape, the washer zk is replaced without being reused.

  Further, the following actions and effects can be obtained regarding heat dissipation when the high-intensity LED 14c is turned on.

  First, when the high-brightness LED 14c is turned on, heat from the high-brightness LED 14c is generated, and this heat is transmitted to the printed circuit board 14 and the temperature of the printed circuit board 14 rises.

  Since the lower surface 14 b of the printed circuit board 14 is joined to the upper surface 11 g of the heat sink 11, the heat of the printed circuit board 14 passes through the flat plate portion 11 a of the heat sink 11 to the contact plate portion 11 c of the heat sink 11 and the end. It is transmitted to the portion 11d (left side in FIG. 2) and all the screw members 13 and 13, and is transmitted to the end metal members 21 and 22.

  Since the joining plate portion 11 c of the heat radiating plate 11 is in contact with the left side surface 22 d of the end metal tube 22, heat is efficiently radiated from the heat radiating plate 11 to the end metal member 22.

  Moreover, since all the screw members 13 which are fastening members also serve as a heat radiating member, the heat radiating efficiency is increased.

  For this reason, temperature rises of the high-brightness LED 14c, the printed circuit board 14, and other electronic components can be suppressed.

  As shown in FIGS. 9 and 10, the lighting device 200 includes a printed circuit board 140 having three flat plate portions 140f, 140g, and 140h (three circuit boards) that are bent along the axis of the cylindrical case 10. A plurality of flat surface portions 110a, 110b, 110c are formed along the axis of the cylindrical case 10 and bonded to the back surfaces of the flat plate portions 140f, 140g, 140h of the printed circuit board 140, and both ends of the heat radiation member 110 End metal members 210, 220 and the like.

  High-brightness LEDs 14c,... Are mounted on the surfaces of the flat plate portions 140f, 140g, 140h of the printed circuit board 140, and the flat plate portions 140f, 140g, 140h are directed in different outward directions. On the left side surface 220d of the end metal member 220, through holes 220f and screw holes 220z,... For passing all the screw members 13 are formed.

  The right side surface 210d of the end metal member 210 is formed with a recess 210K having a cross-sectional shape of the heat radiating member 110, and a through hole 210f through which all the screws 13 are passed is formed on the bottom surface.

  The heat dissipating member 110 is formed in an elongated shape with a hexagonal cross section, the length in the longitudinal direction is set longer than that of the cylindrical case 10, and a through hole 110 e through which all the screw members 13 pass is formed. Yes.

  A flange 110z is provided at one end of the heat radiating member 110, and a screw hole (not shown) is formed in the flange 110z. The heat radiating member 110 is screwed to the left side surface 220 d of the end metal member 220.

  As a result, the outer surface of the flange 110 z is in contact with the left side surface 220 d of the end metal member 220. Further, the other end of the heat radiating member 110 is fitted in the recess 210k of the end metal member 210 in a state where a gap is opened from the back wall (bottom wall).

  By this fitting, the through hole 210f of the recess 210k of the end metal member 210, the through hole 110e of the heat radiating member 110, and the through hole 220f of the end metal member 220 are matched, and all the screws 13 are inserted into the matched holes. Is done.

  In addition, the same code | symbol is attached | subjected to the member same as Example 1, and the description is abbreviate | omitted.

  According to the lighting device 200 of the second embodiment, when the lighting device 200 is assembled, a gap is generated between the other end surface of the heat sink 110 and the bottom wall of the recess 210k (not shown) of the end metal member 210. Therefore, similarly to the first embodiment, the degree of tightening of the nut N1 can be adjusted so as to obtain an optimum surface pressure for the packings 20 and 20.

  Since there is only one screw member 13 as the fastening member, the sealing structure is simpler than that of the first embodiment, the possibility of impairing the sealing performance in the cylindrical case 10 is reduced, and replacement work is further performed. It becomes easy.

  Since the flat plate portions 140f, 140g, and 140h of the printed circuit board 140 are directed in different outward directions, illumination can be performed over a wide range.

  As shown in FIGS. 11 and 12, the illumination device 300 according to the third embodiment has an octagonal cylindrical shape in which eight printed circuit boards having substantially the same shape are arranged along the axial direction of the cylindrical case 10 and both ends are open. The printed circuit board 141 formed on the substrate, the radiating member 111 that is formed in an octagonal cylindrical shape having both ends open, and is in contact with the inner surface (rear surface) 141d of the printed circuit board 141, and both ends of the radiating member 111 End metal members 211, 221 and the like are held.

  High brightness LEDs 14c,... Are mounted on each outer surface 141c of the printed circuit board 141 at predetermined intervals along the longitudinal direction of the printed circuit board 141, and each outer surface 141c is directed in a different outer direction. Yes.

  On the left side surface 221d of the end metal member 221, a through hole 221f and screw holes 221z for passing all the screw members 13 are formed.

  The right side surface 211d of the end metal member 211 is formed with a recess 211K having a cross-sectional shape of the heat dissipation member 111, and a through hole 211f through which all the screws 13 are passed is formed on the bottom surface.

  The heat dissipating member 111 is set so that its length in the longitudinal direction is longer than that of the cylindrical case 10. Further, flanges 111z and 111z are provided at one end of the heat radiating member 111, and screw holes (not shown) are formed in the flange 111z.

  The heat radiating member 111 is screwed to the left side surface 221d of the end metal member 221. Accordingly, the outer surface of the flange 111z of the heat radiating member 111 is in contact with the left side surface 221d of the end metal member 221.

  Further, the other end portion of the heat radiating member 111 is fitted into the annular recess 211k of the end metal member 211 in a state where a gap is opened from the back wall (bottom wall).

  In addition, the same code | symbol is attached | subjected to the member same as Example 1, 2, and the description is abbreviate | omitted.

  According to the illuminating device 300 of the third embodiment, since the outer surfaces 141c of the printed circuit board 141 are directed to different outer directions, it is possible to illuminate over a wider range (360 ° range).

  Since the high-brightness LEDs 14c,... Are mounted on the respective flat plate portions of the printed circuit board 141 bent into an octagonal cylindrical shape, the irradiation direction of each high-brightness LED 14c is directed to the inner peripheral wall 10d of the cylindrical case 10. On the other hand, the luminous flux emitted from the high-intensity LED 14c,... Passes through (incidents) so as to be substantially perpendicular to the tangent to the cylindrical case 10 at the passing portion when passing through the cylindrical case 10. Light is not easily diffracted by the case 10. For this reason, the light emitted from the high-intensity LED 14 c is not dispersed in the cylindrical case 10.

  Similarly to the first and second embodiments, when the lighting device 300 is assembled, a gap is generated between the one end surface of the heat radiating plate 111 and the bottom wall of the recess 211k (not shown) of the end metal member 211. As in the first and second embodiments, the degree of tightening of the nut N1 can be adjusted so that the surface pressure is optimal for the packings 20 and 20.

  In the first to third embodiments, the example in which the polygonal heat dissipation member is applied to the cylindrical lighting device has been described. However, the device has a sealed structure including a heating element, and includes a sealed structure wall. Other devices can be applied as long as the heat dissipating member constituting the unit can be installed inside the device.

14 Printed circuit board 14c High brightness LED (light emitting means)
10 Cylindrical cases 10a, 10b Both ends 21, 22 End metal member (lid member)
100 Illumination device 13 Full screw member (fastening means)

Claims (1)

Printed circuit board, light emitting means mounted on this printed circuit board, translucent cylindrical case in which said printed circuit board and said light emitting means are disposed inside, and both ends are open, and both end openings of this cylindrical case A pair of lid members for sealing and sealing the inside thereof, a heat radiating plate for radiating heat generated by the light emitting means, and a packing interposed between both ends of the cylindrical case and the pair of lid members A lighting device in which the heat sink is joined to the printed circuit board,
An abutting plate portion in surface contact with one back surface of the lid member is provided at one end of the heat radiating plate,
Forming a groove on the other back surface of the lid member, and inserting the other end of the heat sink into the groove;
An illuminating device characterized in that one lid member and the other lid member of the cylindrical case are fastened by fastening means, and both ends of the cylindrical case are sealed with the pair of lid members.

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