JP2013084359A - Straight-tube type led lighting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain straight-tube type LED lighting equipment that can prevent an LED-mounting substrate from floating from a heat sink, and straightly bond (support) the same along a length direction of the heat sink.SOLUTION: The heat sink 10 includes a bonding plate part 11 extended in a length direction of a straight tube 50 for bonding and fixing the LED-mounting substrate 20, a pair of position-regulating parts 12 which are positioned at either side of the bonding plate part 11 in a length direction and controls a position in a direction orthogonally crossing the length direction of the LED-mounting substrate 20 bonded to the bonding plate part 11, and a bent part 13 constituting an outer face of the straight tube 50. A translucent cover 30 has an opening 32 made by notching a part of a cylindrical part constituting the outer face of the straight tube 50, and at either end part of the opening 32, there are a heat sink engagement edge 33 engaged with the heat sink 10 and a substrate-pressing rib 34 for pressing the LED-mounting substrate 20 bonded to the bonding plate part 11 of the heat sink 10 down to the bonding plate part 11.

Description

  The present invention relates to a straight tube type LED lighting apparatus.

  Conventionally, lighting equipment (fluorescent lamp) using a straight tube type fluorescent lamp as a light source has been widely used. However, recently, an LED that has the advantages of low power consumption, long life and high brightness is replaced with a fluorescent lamp. The introduction of tube-type LED lighting equipment is rapidly progressing.

  As a straight tube type LED lighting device, for example, a type in which a cylindrical straight tube is formed as a whole by a heat sink made of a uniform cross-sectional material and a translucent cover member coupled to the heat sink is known. . In this type of straight tube type LED lighting device, an LED mounting substrate in which a large number of LEDs located in a straight tube are mounted in a row is supported on a heat sink.

JP 2011-113876 A

  In this conventional straight tube type LED lighting device, the LED mounting substrate is bonded to the heat sink using a heat-dissipating double-sided tape. However, the LED mounting substrate cannot avoid the heat generated by the large number of LEDs mounted. For this reason, if there is an oil film or dirt on the adhesive surface of the double-sided tape on the LED mounting board and the heat sink, and the adhesion between them is poor, the LED mounting board will be heated from the heat sink when the double-sided tape expands due to heat generation. There is a risk of floating. When the LED mounting board is lifted from the heat sink, the heat dissipation action of the LED mounting board by the heat sink becomes insufficient, the life of the straight tube type LED lighting device is reduced, and uneven light distribution of the LED mounted on the LED mounting board occurs. A problem will occur.

  Moreover, since the total length of the straight tube type LED lighting device is as long as 2400 mm, when the LED mounting substrate is bonded (supported) to the heat sink, the LED mounting substrate is straightened along the length direction of the heat sink. It is difficult and work efficiency is poor. If the LED mounting substrate cannot be straightened along the length direction of the heat sink, the LED mounting substrate bonded (supported) to the heat sink and other members interfere when the heat sink and the light-transmitting cover member are combined. There arises a problem that uneven light distribution of the LED mounted on the mounting substrate occurs.

  The present invention has been completed on the basis of the above problem awareness, and prevents the LED mounting board from floating from the heat sink, and adheres (supports) the LED mounting board straight along the length direction of the heat sink. It aims at obtaining the straight tube | pipe type LED lighting apparatus which can be used.

  In the straight tube type LED lighting device of the present invention, a cylindrical straight tube is formed as a whole by a heat sink made of a uniform cross-sectional material and a translucent cover member coupled to the heat sink. A straight tube type LED lighting apparatus in which an LED mounting substrate on which a large number of LEDs located in a row are mounted is supported, wherein the heat sink extends in the length direction of the straight tube to which the LED mounting substrate is bonded and fixed An adhesive plate part and a pair of position restricting parts that are located on both sides of the adhesive plate part in the length direction and restrict the position in the direction orthogonal to the length direction of the LED mounting substrate bonded to the adhesive plate part And a curved portion that constitutes the outer surface of the straight pipe, and the translucent cover has an opening in which a part of a cylindrical portion that constitutes the outer surface of the straight pipe is cut out, At each end of the opening, A heat sink engagement edge which engages the sink, is characterized by having a board pressing rib pressing the LED mounting substrate bonded to the adhesive plate of the heat sink to 該接 Chakuban unit.

  The tip of the heat sink engagement edge of the translucent cover and the pair of position restriction portions of the heat sink can be engaged / disengaged in the direction along the length direction and cannot be engaged / disengaged in the direction perpendicular to the length direction. It is preferable to form a dovetail-shaped engaging protrusion and an engaging groove.

  As a specific configuration of the dovetail-shaped engagement protrusion and the engagement groove, for example, a bent piece in which the heat sink engagement edge is bent into the straight pipe from both ends of the opening, and the bent A pair of position restricting portions of the heat sink, and a bent recess guide groove for guiding the bent piece, and a spherical recess into which the engaging spherical portion is fitted. And can be formed.

  It is preferable that the heat sink has a slit-shaped cylindrical portion for fixing a base for supplying power to the straight tube type LED lighting device on the curved portion side surface of the adhesive plate portion in a uniform cross section.

  It is preferable to form heat radiation fins with a uniform cross section on the outer surface of the curved portion of the heat sink.

  The LED mounting substrate includes a strip-shaped glass epoxy substrate whose surface is patterned with wiring, a number of LEDs arranged in a row on the wiring pattern of the glass epoxy substrate, and a back surface of the glass epoxy substrate. The LED mounting board can be bonded and fixed to the adhesive plate portion of the heat sink with a heat-dissipating double-sided tape provided on the back surface of the aluminum board. .

  According to the straight tube type LED lighting apparatus of the present invention, the LED mounting substrate is pressed against the adhesive plate portion of the heat sink by the substrate pressing rib of the translucent cover, so that the LED mounting substrate is reliably prevented from floating from the heat sink. Can do. Further, since the position in the direction orthogonal to the length direction of the LED mounting substrate bonded (supported) to the adhesive plate portion is regulated by the pair of position regulating portions of the heat sink, the LED mounting substrate is aligned along the length direction of the heat sink. Can be adhered (supported) straight.

It is a perspective view which shows the decomposition | disassembly state of the straight tube | pipe type LED lighting apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the completion state of the straight tube | pipe type LED lighting apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows the uniform cross section of a heat sink. It is sectional drawing which shows the laminated structure of a LED mounting substrate. It is sectional drawing which shows the uniform cross section of a translucent cover. It is sectional drawing which follows the VI-VI line of FIG. 1 which shows the structure of a nozzle | cap | die. It is a figure which shows the assembly process of a straight tube | pipe type LED lighting apparatus, FIG. 7 (A) is a process which adhere | attaches an LED mounting board to a heat sink, FIG. 7 (B) combines a heat sink and a translucent cover member, and is cylindrical. Each of the steps for forming a straight pipe is shown.

  Hereinafter, with reference to FIG. 1 thru | or FIG. 7, one Embodiment of the straight tube | pipe type LED lighting apparatus 1 by this invention is described. The total length of the straight tube type LED lighting device 1 is, for example, 300 mm (10 W, street light, public telephone, vending machine, etc.), 600 mm (20 W, home use, etc.), 1200 mm (40 W, building, office, etc.) Etc.) can be appropriately set to 2400 mm (station, large facility, etc.).

  As shown in FIG. 1, the straight tube type LED lighting device 1 includes a heat sink 10, an LED mounting substrate 20, a translucent cover member 30, and a pair of caps 40. As shown in FIG. 2, the heat sink 10 and the translucent cover member 30 are combined to form a cylindrical (cylindrical) straight tube 50 as a whole, and the LED mounting is performed so as to be positioned in the straight tube 50. The substrate 20 is supported by the heat sink 10. The pair of caps 40 is fixed to both ends of the straight pipe 50 in the length direction.

  The heat sink 10 is a uniform cross-section material (extruded material) made of a heat-dissipating metal material such as aluminum, copper, magnesium, or iron. As shown in FIGS. 1 and 3, the heat sink 10 includes an adhesive plate portion 11 extending in the length direction of the straight tube 50 and the length of the straight tube 50 located on both sides of the length direction of the adhesive plate portion 11. It has a pair of position control part (bank embankment part) 12 protrudingly formed so as to extend in the direction, and a bending part 13 constituting a part of the outer surface of the straight pipe 50. A hollow portion 14 is formed between the adhesive plate portion 11 and the curved portion 13.

  A cylindrical portion 11 a with a slit extending in the length direction of the straight pipe 50 is formed in a uniform cross section on the surface of the bonding plate portion 11 on the curved portion 13 (hollow portion 14) side. The cylindrical portion 11a with slits improves the rigidity in the length direction of the heat sink 10 and prevents the heat sink 10 from being warped (deformed) over time.

  Each of the pair of position restricting portions 12 has a bent piece guide groove (ant groove-like engaging groove) 12a that opens to the opposite side of the adhesive plate portion 11 and extends in the length direction of the straight pipe 50, and this bent portion. A spherical concave portion (a dovetail engagement groove) 12b located in the back of the one guide groove 12a is formed with a uniform cross section.

  A large number of heat dissipating fins 13 a extending in the length direction of the straight pipe 50 are formed on the outer surface of the curved portion 13 with a uniform cross section. The cooling effect of the heat sink 10 is improved by the heat dissipating fins 13a.

  The LED mounting substrate 20 has a length and width substantially the same as the length and width of the adhesive plate portion 11 of the heat sink 10, and a strip plate shape in which a large number of LEDs are mounted in a row in the length direction of the straight tube 50. It is a member. Hereinafter, the surface facing the translucent cover member 30 side of the LED mounting substrate 20 is referred to as “front surface”, and the surface facing the heat sink 10 side of the LED mounting substrate 20 is referred to as “back surface”.

  As shown in FIG. 4, the LED mounting substrate 20 has a strip-shaped glass epoxy substrate 21 whose surface is subjected to copper thin film wiring patterning (not shown) and is coated to improve reflectivity, A large number of LEDs 22 arranged in a line in the length direction of the straight tube 50 on the wiring patterning of the glass epoxy substrate 21 (only one LED 22 is drawn in FIG. LED22 is lined up). The arrangement of the LEDs 22 on the glass epoxy substrate 21 is secured with extremely high positional accuracy. On the back surface of the glass epoxy substrate 21, an aluminum substrate 23 for heat dissipation having substantially the same shape (width, length, thickness) as the glass epoxy substrate 21 is integrally attached, and heat generated by the LED 22 is transferred to the heat sink 11 side. It is designed to escape efficiently. On the back surface of the aluminum substrate 23, for example, a heat dissipating double-sided tape 24 made of a heat dissipating material made of an inorganic heat conductive filler and silicone is attached, and the back surface of the LED mounting substrate 20 is heat-sinked by the double-sided tape 24. Ten adhesive plate parts 11 are bonded and fixed.

  Here, the width of the LED mounting substrate 20 (the length in the direction perpendicular to the length direction of the straight pipe 50) is the width of the adhesive plate portion 11 of the heat sink 10 (the length in the direction perpendicular to the length direction of the straight pipe 50). ) And minimum clearance. In addition, a pair of position restricting portions 12 that protrude from the surface extension surface of the adhesive plate portion 11 are formed on both sides of the adhesive plate portion 11 of the heat sink 10. Thus, when the LED mounting substrate 20 is bonded and fixed to the adhesive plate portion 11 of the heat sink 10, the pair of position restricting portions 12 restricts the position of the LED mounting substrate 20 in the width direction. It can be straight along the 10 length direction. Therefore, when the heat sink 10 and the translucent cover member 30 are coupled, the LED mounting substrate 20 bonded to the heat sink 10 and other members do not interfere with each other, and the light distribution of the LEDs 22 mounted on the LED mounting substrate 20 Unevenness does not occur.

  The laminated structure of the LED mounting substrate 20 is not limited to that shown in FIG. 4, and the length is set to be substantially the same as the length of the adhesive plate portion 11 of the heat sink 10, and the width is the heat sink. The width of the ten adhesive plate portions 11 and the minimum clearance may be set.

  The translucent cover member 30 is a uniform cross-sectional material made of, for example, a transparent or translucent polycarbonate. As shown in FIG.1 and FIG.5, the translucent cover member 30 has the main-body part 31 of the cross-sectional substantially C shape which has the opening part 32 which notched the circumferential direction part of the cylindrical member, The main body 31 constitutes the outer surface of the straight pipe 50 together with the curved portion 13 (heat radiation fin 13a) of the heat sink 10.

  At both ends of the main body portion 31 (opening portion 32), a heat sink engagement edge (a dovetail engagement protrusion) 33 and a substrate pressing rib 34 are formed in this order from the opening portion side.

  The heat sink engaging edge 33 is a bent piece (ant groove engaging protrusion) 33a bent into the straight pipe 50 from both ends of the main body 31 (opening 32), and a tip of the bent piece 33a. It consists of the formed engaging spherical portion (ant groove-like engaging projection) 33b. By guiding the bent piece 33a with the bent piece guide groove 12a, fitting the engaging spherical portion 33b into the spherical concave portion 12b, and sliding the heat sink 10 and the translucent cover member 30 along the length direction, The heat sink 10 and the translucent cover member 30 are combined to form a cylindrical (cylindrical) straight tube 50 as a whole. That is, the position restricting portion 12 (the bent piece guide groove 12a and the spherical concave portion 12b) of the heat sink 10 and the heat sink engagement edge 33 (the bent piece 33a and the engaging spherical portion 33b) of the translucent cover member 30 are used. Engagement along the length direction of the heat sink 10 and the translucent cover member 30 is possible, and engagement / disengagement in a direction orthogonal to the length direction is impossible.

  The substrate pressing rib 34 presses the LED mounting substrate 20 bonded to the adhesive plate portion 11 of the heat sink 10 toward the adhesive plate portion 11 in a coupled state of the heat sink 10 and the translucent cover member 30. Thereby, the LED mounting substrate 20 is reliably integrated with the adhesive plate part 11. If the aluminum substrate 23 of the LED mounting substrate 20 or the adhesive plate portion 11 of the heat sink 10 on which the double-sided tape 24 is applied has an oil film or dirt and the adhesion between them is poor, the LED mounting substrate 20 generates heat. Even when the double-sided tape 24 is expanded, it is possible to prevent the LED mounting substrate 20 from being lifted from the adhesive plate portion 11 of the heat sink 10 and to maintain the flatness of the LED mounting substrate 20. Therefore, the heat radiation effect of the LED mounting substrate 20 by the heat sink 10 is not lowered, and the light distribution unevenness of the LEDs 22 mounted on the LED mounting substrate 20 does not occur.

  The pair of caps 40 supplies power for causing the LED 22 to emit light to the straight tube type LED lighting device 1. As shown in FIGS. 1 and 6, each of the pair of caps 40 includes a bottomed cylindrical main body portion 41 and a pair of electrode pins 42 that extend outward through the bottom portion of the main body portion 41. Have. The pair of electrode pins 42 is inserted into a pin hole of a power supply socket (not shown) to receive power from the power supply socket. A pair of electrodes for an existing fluorescent lamp standardized by the JIS standard. It has the same shape and spacing as the pin. The pair of electrode pins 42 is electrically connected to the wiring patterning applied to the LED mounting substrate 20 and further to the LED 22 by a conductive connection portion (not shown).

  The cylindrical portion of the main body 41 has a large-diameter cylindrical portion 43 that is fitted to the end portion of the straight pipe 50 from the outer diameter side, and a small-diameter cylindrical portion 44 that is fitted to the end portion of the straight pipe 50 from the inner diameter side. doing. The large-diameter cylindrical portion 43 is a complete cylindrical portion that covers the outer peripheral surface of the straight pipe 50 over the entire circumferential direction. On the other hand, the small-diameter cylindrical portion 44 includes a small arc portion 44 a fitted into the inner peripheral surface of the curved portion 13 of the heat sink 10 and the main body portion 31 of the translucent cover member 30. It is an incomplete cylindrical portion divided into a large arc portion 44b fitted into the inner peripheral surface. Therefore, the small arc portion 44 a of the small diameter cylindrical portion 44 is positioned on the inner peripheral surface of the curved portion 13 of the heat sink 10, and the large arc portion 44 b of the small diameter cylindrical portion 44 is positioned on the main body portion 31 of the translucent cover member 30. By positioning on the inner peripheral surface, the rotational angle positions of the pair of caps 40 and the straight pipe 50 can be uniquely defined.

  A through hole 45 is formed at the bottom of the main body 41 at a position where it communicates with the slitted cylindrical portion 11a of the heat sink 11 in a state where the rotational angle positions of the base 40 and the straight tube 50 are defined as described above. Yes. A fixing screw (tapping screw) (not shown) is inserted through the through hole 45 and screwed into a screw hole (not shown) formed in the cylindrical portion 11 a with the slit of the heat sink 11. 40 can be fixed.

  The straight tube type LED lighting device 1 configured as described above is assembled as follows.

  First, as shown in FIG. 7A, the back surface of the LED mounting substrate 20 is bonded and fixed to the adhesive plate portion 11 of the heat sink 10 with the double-sided tape 24. At this time, the width of the LED mounting substrate 20 is set to be the minimum clearance with the width of the adhesive plate portion 11 of the heat sink 10, and a pair of position restricting portions are provided on both sides of the adhesive plate portion 11 of the heat sink 10. 12 is formed, and the pair of position restricting portions 12 restricts the position in the width direction of the LED mounting substrate 20, so that it is easy to bond and fix the LED mounting substrate 20 straight along the length direction of the heat sink 10. Can be.

  Next, as shown in FIG. 7B, the bent piece 33a is guided by the bent piece guide groove 12a, and the engaging spherical portion 33b is fitted into the spherical concave portion 12b, so that the heat sink 10 and the translucent cover member 30 are provided. Are slid along the length direction, and the heat sink 10 and the translucent cover member 30 are combined to form a cylindrical (cylindrical) straight tube 50 as a whole. At this time, the LED mounting substrate 20 bonded to the heat sink 10 does not interfere with other members, and the LED mounting substrate 20 that causes uneven light distribution of the LED 22 does not deform. In the state where the straight pipe 50 is formed, the substrate pressing rib 34 presses the LED mounting substrate 20 bonded to the bonding plate portion 11 of the heat sink 10 toward the bonding plate portion 11. For this reason, when the aluminum substrate 23 of the LED mounting substrate 20 or the adhesive plate portion 11 of the heat sink 10 on which the double-sided tape 24 is applied has an oil film or dirt and the adhesion between them is poor, the LED mounting substrate 20 generates heat. Even when the double-sided tape 24 expands, the LED mounting substrate 20 does not float from the adhesive plate portion 11 of the heat sink 10, and the flatness of the LED mounting substrate 20 is maintained. Therefore, the heat radiation effect of the LED mounting substrate 20 by the heat sink 10 is not lowered, and the light distribution unevenness of the LEDs 22 mounted on the LED mounting substrate 20 does not occur.

  And the small circular arc part 44a of the small diameter cylindrical part 44 is located in the inner peripheral surface of the curved part 13 of the heat sink 10, and the large circular arc part 44b of the small diameter cylindrical part 44 is on the main body part 31 of the translucent cover member 30. The pair of caps 40 are fitted into both end portions of the straight pipe 50 so as to be positioned on the inner peripheral surface. Finally, a fixing screw (tapping screw) (not shown) is inserted through the through hole 45 of the base 40 and screwed into the cylindrical portion 11 a with the slit of the heat sink 11, thereby fixing the base 40 to both ends of the straight pipe 50.

  As described above, according to the straight tube type LED lighting device 1 of the present embodiment, the LED mounting substrate 20 is pressed against the adhesive plate portion 11 of the heat sink 10 by the substrate pressing rib 34 of the translucent cover 30. It is possible to reliably prevent the substrate 20 from floating from the heat sink 10. Further, since the pair of position restricting portions 12 of the heat sink 10 restricts the position in the direction orthogonal to the length direction of the LED mounting substrate 20 bonded (supported) to the adhesive plate portion 11, the LED mounting substrate 20 is attached to the heat sink 10. It is possible to adhere (support) straight along the length direction of.

DESCRIPTION OF SYMBOLS 1 Straight pipe type LED lighting apparatus 10 Heat sink 11 Adhesion board part 11a Cylindrical part 12 with a slit Position control part (bank embedding part)
12a Bent piece guide groove (Dovetail engagement groove)
12b Spherical recess (Dovetail engagement groove)
13 Curved portion 13a Heat radiation fin 14 Hollow portion 20 LED mounting substrate 21 Glass epoxy substrate 22 LED
23 Aluminum substrate 24 Double-sided tape 30 Translucent cover member 31 Main body 32 Opening 33 Heat sink engagement edge (ant groove-like engagement protrusion)
33a Folded piece (Dovetail engagement protrusion)
33b Engagement spherical part (Dovetail engagement protrusion)
34 Substrate pressing rib 40 A pair of bases 41 A main part 42 A pair of electrode pins 43 A large diameter cylindrical part 44 A small diameter cylindrical part 44a A small circular arc part 44b A large circular arc part 45 A through hole 50 A straight pipe

Claims (6)

A cylindrical straight tube is formed as a whole by a heat sink made of a uniform cross-sectional material and a translucent cover member coupled to the heat sink, and a large number of LEDs located in the straight tube are mounted in a row on the heat sink A straight tube type LED lighting device in which the LED mounting substrate is supported,
The heat sink is disposed on both sides of the adhesive plate portion in the length direction of the straight pipe for bonding and fixing the LED mounting substrate, and is bonded to the adhesive plate portion. A pair of position restricting portions for restricting the position in the direction orthogonal to the length direction of the LED mounting substrate, and a curved portion constituting the outer surface of the straight pipe,
The translucent cover has openings cut out from a part of a cylindrical portion constituting the outer surface of the straight pipe, and heat sink engagements engaged with the heat sinks at both ends of the opening, respectively. A straight tube type LED lighting device having an edge and a substrate pressing rib for pressing an LED mounting substrate bonded to the bonding plate portion of the heat sink against the bonding plate portion. In the straight tube type LED lighting device according to claim 1,
The tip of the heat sink engagement edge of the translucent cover and the pair of position restriction portions of the heat sink can be engaged / disengaged in the direction along the length direction and cannot be engaged / disengaged in the direction perpendicular to the length direction. A straight tube type LED lighting device in which a dovetail-like engagement protrusion and an engagement groove are formed. In the straight tube type LED lighting device according to claim 2,
The heat sink engagement edge is composed of a bent piece bent into the straight pipe from both ends of the opening, and an engaging spherical portion formed at the tip of the bent piece. The straight tube type LED lighting device in which the position restricting portion is formed with a bent piece guide groove for guiding the bent piece and a spherical recess into which the engaging spherical portion is fitted. In the straight tube type LED lighting device according to any one of claims 1 to 3,
In the heat sink, a straight tube type in which a cylindrical portion with a slit for fixing a base for supplying power to a straight tube type LED lighting device is formed in a uniform cross section on the curved portion side surface of the adhesive plate portion LED lighting equipment. In the straight tube | pipe type LED lighting apparatus of any one of Claim 1 thru | or 4,
A straight tube type LED lighting device in which heat radiation fins are formed in a uniform cross section on the outer surface of the curved portion of the heat sink. In the straight tube type LED lighting device according to any one of claims 1 to 5,
The LED mounting substrate includes a strip-shaped glass epoxy substrate whose surface is patterned with wiring, a number of LEDs arranged in a row on the wiring pattern of the glass epoxy substrate, and a back surface of the glass epoxy substrate. A straight tube having a laminated structure composed of a heat-dissipating aluminum substrate provided, and the LED mounting substrate being bonded and fixed to the adhesive plate portion of the heat sink by a heat-dissipating double-sided tape provided on the back surface of the aluminum substrate. Type LED lighting equipment.

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