JP2011034804A - Illumination unit and illuminating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce warping by applying reflow solder to a paper phenol-base circuit board. <P>SOLUTION: The illumination unit include a paper phenol base circuit board 32 having a wiring pattern 34, a plurality of light-emitting elements 33 mounted on the paper phenol base circuit board 32, and stripe slits 38 formed in the surface of the wiring pattern 34. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an illumination unit including a circuit board on which a light emitting element is mounted, and an illumination device configured using the illumination unit.

  In recent years, lighting devices using light emitting elements such as LEDs have attracted attention from the viewpoint of energy saving. As such an illuminating device, there is known an illuminating device provided with a glass epoxy circuit board in which a plurality of substantially square wiring patterns are formed on one surface of a circuit board. Each of the plurality of wiring patterns is divided by an insulating pattern, and adjacent wiring patterns are formed so that the concavo-convex portions face each other. LEDs are arranged on the concave and convex portions facing each other in adjacent wiring patterns, and the LEDs are connected in series by the wiring patterns. (See Patent Document 1).

JP 2004-335880 A

  In this type of lighting device, cost reduction is required, and for this purpose, an inexpensive insulating substrate such as a paper phenol base circuit board (phenol laminated board) is used. However, it is known that a circuit board such as a paper phenol base circuit board warps at a high temperature due to a difference in coefficient of thermal expansion from the wiring pattern, and the LED mounting is reflowed to about 220 ° C. to 250 ° C. When soldering is performed, there is a problem in that the circuit board with the warpage is caught in the passage portion in the soldering apparatus that feeds the circuit board and executes reflow, and soldering cannot be performed properly. There is also a concern that a warped substrate cannot be mounted on the instrument side.

  The present invention has been made as a solution to the problems in the lighting device using the light emitting element as described above, and its purpose is to reduce warpage and perform appropriateness when performing reflow soldering using an insulating circuit board. It is providing the unit for illumination which can mount LED. Moreover, it aims at providing the illuminating device comprised using this unit for illumination.

  An illumination unit according to the present invention includes an insulating circuit board having a wiring pattern formed on a surface thereof; a plurality of light emitting elements mounted on the insulating circuit board; and a longitudinal direction of the insulating circuit board on the surface of the wiring pattern. And a linear slit formed so as to extend in an orthogonal direction.

  An example of an insulating substrate in which warpage is a problem due to a difference in thermal expansion coefficient from the wiring pattern includes a paper phenol base circuit board, but the present invention is not limited to this, and the same type of warpage occurs. This is applicable when an insulating substrate is used. In the present invention, it is possible to effectively reduce warpage in the case of a single-sided board of an insulating circuit board, but the invention is not limited to a single-sided board. The shape of the line slit is allowed to be linear, S-shaped, zigzag or the like. An LED can be used as the light emitting element. Moreover, although a slit has the depth more than the same dimension as the thickness of a wiring pattern, it keeps it to the depth which does not weaken the mechanical strength of a base material.

  The illumination unit according to the present invention is characterized in that the linear slit is formed to extend in a direction perpendicular to the fiber direction in the insulating circuit board.

  The fiber direction can be identified by a mark unique to the manufacturer, and a linear slit is formed in accordance with this mark.

  An illumination device according to the present invention includes: the illumination unit according to claim 1; a lighting device for lighting a light emitting element of the illumination unit; and a translucent cover that includes the illumination unit and a lighting circuit. It is characterized by comprising.

  According to the illumination unit of the present invention, since the line slit is formed on the surface of the wiring pattern in the insulating circuit board, the expansion and contraction of this surface due to high heat is alleviated by the line slit, and the circuit board as a whole Even when warping is suppressed and reflow soldering is performed, the LED can be appropriately mounted.

  According to the illumination unit according to the present invention, the linear slit is formed so as to extend in a direction perpendicular to the fiber direction in the insulating circuit board, so that the expansion and contraction in the fiber direction of the circuit board is relaxed by the linear slit. LED can be mounted more appropriately.

  According to the lighting device according to the present invention, it is possible to reduce the price by using an insulating circuit board on which LEDs can be mounted by a reflow soldering process.

The perspective view of the crime prevention light as one Embodiment of the illuminating device comprised using the unit for illumination which concerns on this invention. The bottom view of FIG. FIG. 2 is a side sectional view of FIG. 1. The top view of the paper phenol base circuit board before forming a filament slit. The top view of the paper phenolic base circuit board of the state which formed the filament slit by 1st arrangement | positioning. The top view of the paper phenolic base circuit board of the state which formed the filament slit by 2nd arrangement | positioning.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an illumination unit and an illumination device using the illumination unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. In each figure, the same components are denoted by the same reference numerals and redundant description is omitted. 1 to 3 show a security light 10 as an embodiment of a lighting device. The security light 10 includes a translucent cover 20 having a cylindrical shape with a flat side portion of a cone. This cover 20 is integrally formed of acrylic or polycarbonate.

  An illumination unit 30 and a lighting device 40 are provided inside the cover 20. The cover 20 and the lighting unit 30 are fixed to the base 60. The security light 10 is attached to an arm 50 bent in a “<” shape, and the arm 50 is attached to a utility pole or the like by means of a mounting bracket or the like.

  The cover 20 is composed of a light projecting portion 21 on the lower side and a shade portion 22 on the upper side in the installed state. The cover 20 has an opening 23 at a connection portion with the base 60, and includes a storage chamber 24 that is a space from the opening 23 to the cover 20 side. A portion of the cover 20 surrounding the opening 23 is a tubular base portion 25. The opening 23 is closed by a closing plate 61 of the base 60. An end portion in a direction in which the storage chamber 24 side is viewed from the opening portion 23 is a front end portion 28 of the cover 20.

  A band-shaped step portion 26 that protrudes outward and circulates around the outer periphery of the cover 20 is formed at a boundary portion between the light projecting portion 21 and the shade portion 22 of the cover 20. A groove portion 27 is formed inside the step portion 26. At the front end portion 28 of the cover 20, a holding portion 27 a is formed in the groove portion 27. For example, an aluminum radiating plate 31 is engaged with the sandwiching portion 27 a and the groove portion 27. The end portion of the heat sink 31 on the opening 23 side is in contact with the closing plate 61, and the housing chamber 24 of the cover 20 is separated by the heat sink 31 into the light projecting portion 21 side and the shade portion 22 side.

  A circuit board 32 which is a paper phenol base circuit board as an insulating circuit board constituting the illumination unit 30 is attached to the heat radiating plate 31 with screws. As shown in FIG. 4, the illumination unit 30 includes the circuit board 32 and an LED 33 which is a light emitting element. LED33 is mounted in the surface in which the wiring pattern 34 comprised with copper foil was formed. On the back side, not shown, is a single-sided substrate on which no wiring pattern is formed.

  The wiring pattern 34 has a relatively large area because it has a function of transferring the heat generated by the LED 33 through the lead terminal and the copper foil pattern and radiating heat from the surface to the outside by conduction and conduction. , And provided in 8 areas divided by the insulating pattern 35. The wiring pattern 34 includes lands that connect the LEDs 33 at appropriate positions via the insulating pattern 35. A capacitor C is electrically connected to each of the eight LEDs 33 in parallel. Two adjacent wiring patterns 34 are provided with power lands 36, 36, and power is supplied to eight LEDs 33 connected in series by eight wiring patterns 34. The screw hole 37 of the circuit board 32 is for attaching to the heat radiating plate 31 with a screw, and the screw hole 37a is used for screwing to the case 40a of the lighting device 40.

  In the present embodiment, as shown in FIG. 5 or 6, the line slits 38 are formed on the surface of the wiring pattern 34 so as to extend in a direction perpendicular to the longitudinal direction of the circuit board 32 shown in FIG. 4. The linear slit 38 is formed so as not to electrically divide the wiring pattern 34 related to one area. The linear slit 38 is formed in a direction perpendicular to the fiber direction, with the longitudinal direction of the circuit board 32 being the fiber direction. Further, symmetrical line slits 38 are formed across a line segment (an extension of the line segment A) that bisects the width direction of the circuit board 32. The line slits 38 are formed in the wiring pattern 34, but may be formed in the circuit board 32.

  On the circuit board 32 having the above-described configuration, reflow solder is arranged, the LED 33 and the capacitor C are arranged at required positions, and are put into a reflow soldering apparatus for soldering. In this case, the linear slit 38 can reduce the expansion and contraction of the circuit board 32 to suppress the warp, and the LED 33 and the capacitor C can be appropriately mounted. Since the circuit board 32 that has undergone the reflow process returns to a flat shape, it can be attached to the heat sink 31 in the same manner as a normal circuit board.

  A lighting device 40 is provided on the surface of the heat dissipation plate 31 to which the circuit board 32 is not attached. The lighting device 40 is attached to the circuit board 32 by screws through screw holes 37a.

  A power distribution portion 42 that protrudes toward the base 60 side in a cylindrical shape is provided at a substantially central portion of the closing plate 61, and a waterproof bush 48 is fitted to the power distribution portion 42. A lead wire 43 for supplying power is inserted into the waterproof bush 48 to supply power to the lighting device 40. The lighting device 40 includes a circuit board on which an electronic circuit constituting a constant current circuit or the like is mounted inside the case 40a. The lighting device 40 generates a DC voltage and leads to the circuit board 32 through a hole (not shown) of the heat sink 31. A voltage is supplied to the power supply lands 36 of the wiring pattern 34.

  A screw 29a is formed on the inner side surface 29 of the base portion 25 over the inner circumferential direction. A head portion 62 continuous with the closing plate 61 has a cylindrical shape, and the screw 29a on the inner surface side of the base portion 25 is formed. A screw protrusion 63 is formed at a position where the screw protrusion is engaged with the screw protrusion 63. An annular groove 64 is continuously formed in the circumferential direction at a portion facing the flat surface 25b on the inner surface side of the base portion 25, and the O-ring contacting the flat surface 25b is formed in the groove 64. 65 is inserted.

  Therefore, the screw projection 63 of the head 62 can be screwed into the screw 29a on the inner surface side of the base portion 25 so that both can be fitted. As a result, the closing plate 61 of the base 60 enters the storage chamber 24 from the opening 23, and the O-ring 65 comes into contact with the flat surface 25 b on the inner surface of the base 25. The O-ring 65 is pressed between the flat surface 25b and the concave groove 64 continuous with the closing plate 61 to be elastically deformed, and the inside of the opening 23 becomes a water-tight structure to ensure waterproofness.

  In the crime prevention light 10 as the lighting device having the above configuration, the circuit board 32 which is the paper phenol base circuit board constituting the lighting unit 30 is used, so that the cost can be reduced. Since the circuit board 32 which is a paper phenol base circuit board is formed with the linear slit 38 as described above, the linear slit 38 relaxes the expansion and contraction of the circuit board 32 and suppresses the warpage in the reflow soldering process. The LED 33 and the capacitor C can be appropriately mounted.

10 security light 20 cover 26 step 30 lighting unit 31 heat sink 32 circuit board 33 LED
34 wiring pattern 35 insulating pattern 38 linear slit 40 lighting device 50 arm 60 base

Claims (3)

An insulating circuit board having a wiring pattern formed on the surface;
A plurality of light emitting elements mounted on an insulating circuit board;
An illumination unit comprising: a line slit formed on a surface of the wiring pattern so as to extend in a direction orthogonal to a longitudinal direction of the insulating circuit board. The lighting unit according to claim 1, wherein the linear slit is formed to extend in a direction orthogonal to the fiber direction in the insulating circuit board. An illumination unit according to claim 1 or 2;
A lighting device for lighting the light emitting element of the lighting unit;
An illuminating device comprising: an illumination unit; and a translucent cover containing a lighting circuit.

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