JP2015149248A - Light source for lighting and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source for lighting which inhibits continuous use in an unstable state when malfunction occurs.SOLUTION: A straight pipe LED lamp 1 includes: a long housing 20; and a long substrate 11 disposed in the housing 20. Multiple LED elements 12 arranged in a longitudinal direction and metal wiring 13 for supplying electric power to the multiple LED elements 12 are provided at the substrate 11. The substrate 11 is fixed to the housing 20 at a first position and a second position which are located adjacent to each other in the longitudinal direction. In the substrate 11, a groove 14 is provided between the first position and the second position.

Description

  The present invention relates to an illumination light source and an illumination device, for example, an illumination light source and an illumination device having a light emitting element such as a light emitting diode (LED).

  The LED is expected to be an alternative light source for various lamps such as fluorescent lamps and incandescent lamps which are conventionally known because of high efficiency and long life. In particular, product development of lamps using LEDs (LED lamps) has been actively promoted.

  As this type of LED lamp, for example, a straight tube type LED lamp (straight tube LED lamp) that replaces a straight tube fluorescent lamp is known (see Patent Document 1).

  Such a straight tube LED lamp includes a base provided at both ends of a long outer casing, an LED module, and a lighting circuit for lighting the LED module. The LED module includes, for example, a substrate and a plurality of LED elements mounted on the substrate.

JP 2009-043447 A

  However, the above-described conventional straight tube LED lamp has a problem that the use is continued even if it is in an unstable state when a malfunction occurs.

  The LED element generates heat when it is supplied with power and emits light. As the heat from the LED element is conducted to the substrate, the substrate is thermally expanded. When the substrate is bent and deformed due to thermal expansion, a load may be applied to the connection portion between the substrate and the lead wire, or the LED element, which may cause problems such as poor energization. Continuing to use the straight tube LED lamp when a problem such as a power failure occurs is not preferable because a further problem may occur.

  Therefore, the present invention provides an illumination light source and an illumination device that can prevent the use from being continued in an unstable state when a problem occurs.

  In order to solve the above problems, an illumination light source according to one embodiment of the present invention includes a long casing and a long substrate disposed in the casing, and the substrate includes a longitudinal direction. A plurality of light emitting elements arranged side by side and a metal wiring for supplying power to the plurality of light emitting elements, and the substrate is arranged at the first position and the second position adjacent to each other in the longitudinal direction. The board is fixed to a housing, and the board is provided with a weak part between the first position and the second position where the board has a lower mechanical strength than the others.

  In the illumination light source according to one embodiment of the present invention, the cross-sectional area of the cross section including the fragile portion in the cross section orthogonal to the longitudinal direction of the substrate may be smaller than the cross-sectional area of the cross section not including the fragile portion. Good.

  In the illumination light source according to one aspect of the present invention, the fragile portion may be a groove provided so as to intersect the longitudinal direction of the substrate.

  In the illumination light source according to one aspect of the present invention, the plurality of light emitting elements and the metal wiring are provided on a first main surface of the substrate, and the groove is a second surface facing the first main surface. It may be provided on the main surface.

  In the illumination light source according to one aspect of the present invention, the fragile portion may be a through hole or a slit.

  In the illumination light source according to one embodiment of the present invention, the fragile portion may be provided between adjacent first light emitting elements and second light emitting elements included in the plurality of light emitting elements.

  In the illumination light source according to one aspect of the present invention, the fragile portion may be provided in a central region between the first position and the second position.

  In the illumination light source according to one aspect of the present invention, the substrate may be fixed to the inner surface of the housing with an adhesive at the first position and the second position.

  In the illumination light source according to one embodiment of the present invention, the adhesive may be a silicone resin.

  Moreover, the illuminating device which concerns on 1 aspect of this invention is an illuminating device provided with the said light source for illumination.

  ADVANTAGE OF THE INVENTION According to this invention, when a malfunction arises, it can suppress that use will be continued in an unstable state.

It is a general-view perspective view which shows an example of the straight tube | pipe LED lamp which concerns on Embodiment 1 of this invention. It is sectional drawing which shows an example of the straight tube | pipe LED lamp which concerns on Embodiment 1 of this invention. It is a top view which shows an example of the LED module which concerns on Embodiment 1 of this invention. It is sectional drawing for demonstrating the effect of the groove | channel provided in the board | substrate which concerns on Embodiment 1 of this invention. It is a top view which shows an example of the LED module which concerns on the modification 1 of Embodiment 1 of this invention. It is a top view which shows an example of the LED module which concerns on the modification 2 of Embodiment 1 of this invention. It is a general-view perspective view which shows an example of the illuminating device which concerns on Embodiment 2 of this invention.

  Below, the light source for illumination and the illuminating device which concern on embodiment of this invention are demonstrated in detail using drawing. Note that each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangements, connection forms, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected about the same structural member.

  In the following embodiments, a straight tube LED lamp, which is an embodiment of a light source for illumination, and a lighting device including the straight tube LED lamp are illustrated.

(Embodiment 1)
First, a straight tube LED lamp according to Embodiment 1 of the present invention will be described. The straight tube LED lamp according to the present embodiment is an example of an illumination light source that replaces a conventional straight tube fluorescent lamp.

[Overall configuration of straight tube LED lamp]
First, an example of the configuration of the straight tube LED lamp according to the present embodiment will be described with reference to FIGS.

  FIG. 1 is a schematic perspective view showing an example of a straight tube LED lamp according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing an example of a straight tube LED lamp according to Embodiment 1 of the present invention. FIG. 2 shows a cross section passing through the tube axis direction of the straight tube LED lamp and perpendicular to the LED module (YZ cross section).

  As shown in FIG. 1, the straight tube LED lamp 1 is for power supply fixed to each of an LED module 10, a long casing 20, and an end portion in the longitudinal direction (tube axis direction) of the casing 20. A base 30 and a non-power feeding base 40, a lead wire 50, and an adhesive 60 that fixes the LED module 10 to the housing 20 are provided. The straight tube LED lamp 1 is, for example, a 40-shaped straight tube LED lamp, and the total length of the lamp is about 1200 mm.

  In FIG. 1, the X-axis direction is the short direction of the LED module 10. The Y-axis direction is the longitudinal direction of the LED module 10, that is, the tube axis direction of the housing 20. The Z-axis direction is a direction perpendicular to the main surface of the LED module 10.

  Hereinafter, each component of the straight tube LED lamp 1 will be described in detail.

[LED module]
First, the LED module 10 according to the present embodiment will be described with reference to FIGS. 1 and 2 and FIG. FIG. 3 is a plan view showing an example of the LED module according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the LED module 10 is a light source of the straight tube LED lamp 1 and is disposed in the housing 20. For example, as shown in FIG. 2, the LED module 10 is arranged so that the end portion protrudes from the housing 20.

  The LED module 10 according to the present embodiment is a light emitting module of a surface mount (SMD: Surface Mount Device) type. The LED module 10 includes a substrate 11, a plurality of LED elements 12 mounted on the substrate 11, a lighting circuit (not shown) for lighting the plurality of LED elements 12, a plurality of LED elements 12 and a lighting circuit. And metal wiring 13 patterned in a predetermined shape for electrical connection.

  The substrate 11 is a long substrate disposed in the housing 20. The substrate 11 is, for example, a rectangular substrate. The substrate 11 has a longitudinal direction (Y-axis direction in FIG. 1) parallel to the longitudinal direction of the straight tubular case 20, and a short side direction (X-axis direction in FIG. 1) is a short direction of the case 20. Are arranged in the housing 20 so as to be parallel to each other.

  The substrate 11 has a first main surface (front surface) and a second main surface (back surface) that face each other. As shown in FIG. 3, the first main surface of the substrate 11 is provided with a plurality of LED elements 12 arranged in the longitudinal direction and a metal wiring 13 for supplying power to the plurality of LED elements 12. It has been.

  The substrate 11 has, for example, a length of 1150 to 1200 mm (longitudinal direction), a width of 5 to 25 mm (short side direction), and a thickness of 0.3 to 2.0 mm. The substrate 11 is longer than the housing 20 in the longitudinal direction.

  Specifically, the substrate 11 is a mounting substrate for mounting the LED element 12. The substrate 11 is, for example, a resin substrate based on resin, a metal base substrate based on metal, a ceramic substrate made of ceramic, or a glass substrate made of glass.

  The resin substrate may be made of, for example, a glass epoxy substrate made of glass fiber and epoxy resin (CEM-3, FR-4, etc.), a substrate made of paper phenol or paper epoxy (FR-1 etc.), or polyimide. For example, a flexible substrate having flexibility. The metal base substrate is, for example, an aluminum alloy substrate, an iron alloy substrate, or a copper alloy substrate having an insulating film formed on the surface. In the present embodiment, a CEM-3 double-sided substrate is used as the substrate 11.

  One end of the substrate 11 in the longitudinal direction is covered with a power supply cap 30. The other end of the substrate 11 in the longitudinal direction is covered with a non-power feeding base 40. For example, the substrate 11 is arranged so that the end portion protrudes from the housing 20, and at least the protruding portion is covered with the power supply base 30 and the non-power supply base 40.

  As shown in FIG. 2, the substrate 11 is fixed to the housing 20 at a plurality of positions (fixed points) different from each other in the longitudinal direction. The plurality of positions are places on the substrate 11 fixed to the housing 20. The plurality of positions are two or more positions including a first position and a second position that are adjacent to each other. In other words, the substrate 11 is fixed to the housing 20 in at least two places.

  The board | substrate 11 is being fixed to the inner surface of the housing | casing 20 with the adhesive agent 60 in the some position, for example. That is, the plurality of positions are regions in contact with the adhesive 60 on the second main surface of the substrate 11. The adhesive 60 is, for example, a silicone resin or cement.

  The board 11 is provided with a weak part between the first position and the second position where the mechanical strength of the board 11 is weaker than the others. The fragile portion is a structure in which the substrate 11 is easily broken when the substrate 11 is bent. That is, the fragile portion is a structure for promoting breakage of the substrate 11.

  For example, the mechanical strength of the substrate 11 where the weak portion is provided is weaker than the mechanical strength of the substrate 11 where the weak portion is not provided. Specifically, in the cross section orthogonal to the longitudinal direction of the substrate 11, the cross sectional area of the cross section including the fragile portion is smaller than the cross sectional area of the cross section not including the fragile portion. For example, the cross-sectional area of the cross section including the fragile portion is smaller than the cross-sectional area of the cross section including the LED element 12.

  Specifically, as shown in FIG. 2, a groove 14 is provided on the second main surface of the substrate 11. The groove 14 is an example of a weak part where the mechanical strength of the substrate 11 is weaker than the others. The groove 14 is, for example, a groove provided so as to intersect the longitudinal direction of the substrate 11. More specifically, the groove 14 is a recess provided in parallel with the short direction of the substrate 11.

  As an example, the groove 14 is a groove formed by two planes intersecting each other, and is a groove having a V-shaped cross section. The groove 14 is not limited to a V shape, and may be a groove having a U-shaped cross section or a groove having a rectangular cross section. The groove 14 is formed, for example, by cutting out the second main surface of the substrate 11 in the lateral direction.

  The groove 14 is provided between two adjacent LED elements 12 included in the plurality of LED elements 12. That is, since the groove 14 is provided between two adjacent LED elements 12, the LED element 12 is provided in the region of the first main surface opposite to the region of the second main surface where the groove 14 is provided. Absent. In other words, the LED element 12 is not provided immediately above the groove 14. That is, the groove 14 is not provided immediately below the LED element 12.

  The mechanical strength of the substrate 11 where the groove 14 is provided is weaker than the mechanical strength of the substrate 11 where the groove 14 is not provided. For example, the mechanical strength of the substrate 11 where the groove 14 is provided is weaker than the mechanical strength of the substrate 11 where the LED element 12 is provided.

  By providing the groove 14 in the substrate 11, the cross-sectional area of the cross section including the groove 14 is smaller than the cross-sectional area of the cross section not including the groove 14 in the cross section orthogonal to the longitudinal direction of the substrate 11. For example, in the cross section orthogonal to the longitudinal direction of the substrate 11, the cross sectional area of the cross section including the groove 14 is smaller than the cross sectional area of the cross section including the LED element 12.

  Moreover, the groove | channel 14 may be provided in the center area | region between the adjacent 1st position and 2nd position, ie, the adhesive agent 60 of two adjacent places. The central region is a region including the midpoint between the first position and the second position. In other words, the groove 14 is provided in a predetermined region including a midpoint between the first position and the second position. That is, the cross-sectional area of the cross section of the substrate 11 at the midpoint between the first position and the second position is smaller than the cross-sectional area of the cross section of the substrate 11 in other regions.

  Thus, the mechanical strength of the substrate 11 in the central region between the two adjacent adhesives 60 can be made weaker than the mechanical strength of the substrate 11 other than the central region.

  The LED element 12 is an example of a light emitting element and is mounted on the substrate 11. In the present embodiment, the plurality of LED elements 12 are mounted so as to be arranged in a line along the longitudinal direction of the substrate 11. As shown in FIGS. 1 to 3, each of the plurality of LED elements 12 is disposed apart from each other.

  The LED element 12 is a so-called SMD type light emitting element in which an LED chip and a phosphor are packaged. The LED element 12 includes a package, an LED chip disposed in the package, and a sealing member that seals the LED chip. The LED element 12 is, for example, a white LED element that emits white light.

  The package is a container formed of a white resin or the like, and includes an inverted frustoconical concave portion (cavity). The inner surface of the recess is inclined and configured to reflect light from the LED chip upward.

  The LED chip is mounted on the bottom surface of the recess of the package. The LED chip is a bare chip that emits monochromatic visible light, and is die-bonded to the bottom surface of the recess of the package by a die attach material (die bond material). The LED chip is, for example, a blue LED chip that emits blue light when energized.

  The sealing member is a phosphor-containing resin including a phosphor that is a light wavelength converter, and converts light emitted from the LED chip into a predetermined wavelength (color conversion). The sealing member protects the LED chip by sealing the LED chip. The sealing member is filled in the recess of the package, and is sealed up to the opening surface of the recess.

The sealing member includes a material selected based on the color (wavelength) of light emitted from the LED chip and the color (wavelength) of light required as a light source. For example, in order to obtain white light when the LED chip is a blue LED chip, a phosphor-containing resin obtained by dispersing YAG (yttrium, aluminum, garnet) -based yellow phosphor particles in a silicone resin is used as a sealing member. Can be used. As a result, the yellow phosphor particles are excited by the blue light of the blue LED chip to emit yellow light, so that the sealing member emits white light as a combined light of the excited yellow light and the blue light of the blue LED chip. Is released. The sealing member may contain a light diffusing material such as silica (SiO ₂ ).

  The LED element 12 configured in this way has two electrode terminals of a positive electrode and a negative electrode, and these electrode terminals and the metal wiring 13 formed on the substrate 11 are electrically connected.

  The metal wiring 13 is a metal wiring for supplying predetermined power to each of the plurality of LED elements 12. The metal wiring 13 is patterned in a predetermined shape. In the present embodiment, the straight tube LED lamp 1 employs a one-side power feeding method in which power is fed to all the LED elements 12 in the housing 20 from one side of the power feeding base 30 alone. Therefore, as shown in FIG. 3, metal electrodes 13 a and 13 b are provided at both ends of the metal wiring 13. One of the metal electrodes 13a and 13b is a high potential side electrode, and the other is a low potential side electrode.

  For example, the metal electrodes 13a and 13b are connected to a pair of power supply pins 32 of a power supply base by two lead wires 50 (a pair of lead wires). Specifically, one lead wire 50 of the pair of lead wires is connected to the metal electrode 13 a and one of the pair of power supply pins 32. The other lead wire 50 of the pair of lead wires is connected to the metal electrode 13 b and the other of the pair of power supply pins 32. For example, the end portion of the lead wire 50 is soldered to the metal electrodes 13a and 13b.

  The metal wiring 13 and the metal electrodes 13a and 13b are made of a metal having high conductivity such as copper (Cu), for example. Alternatively, the metal wiring 13 may be nickel, aluminum, gold, or a laminated film or alloy made of two or more of these metals.

  The lighting circuit (not shown) is an LED lighting circuit for lighting the LED element 12 mounted on the LED module 10. The lighting circuit is composed of one or a plurality of circuit elements (circuit parts).

  For example, the lighting circuit adjusts and outputs a DC voltage input via the lead wire 50 to a predetermined polarity for causing the LED element 12 to emit light. The DC power output from the lighting circuit is supplied to the LED element 12 of the LED module 10 via, for example, the metal wiring 13 formed on the substrate 11.

  Although not shown, the lighting circuit is arranged in a region close to the metal electrodes 13a and 13b, for example. That is, the lighting circuit is disposed between the metal electrodes 13a and 13b and the LED element 12 closest to the metal electrodes 13a and 13b.

  A circuit element (not shown) is directly mounted on the substrate 11 using the substrate 11 of the LED module 10. The circuit element is, for example, a rectifier circuit, a detection resistor, or a fuse element. In addition, a resistor, a capacitor, a coil, a diode, a transistor, or the like may be used as necessary.

  Further, the lighting circuit may be provided on a substrate (circuit substrate) different from the substrate 11. In this case, the circuit board and the board 11 may be electrically connected with a lead wire or the like.

  In order to improve the light extraction efficiency of the LED module 10, a white paint (white resist) may be applied to the surface of the substrate 11. Since the white resist has high light reflectivity, the light extraction efficiency of the LED module 10 can be improved. Further, by forming the white resist, the insulation (breakdown voltage) of the substrate 11 can be improved, and the oxidation of the metal wiring 13 can be suppressed.

[Case]
The case 20 is a long case in which the substrate 11 is disposed. Specifically, the housing 20 is a long translucent cover having translucency that covers a part of the LED module 10.

  For example, as illustrated in FIG. 1, the housing 20 is a long cylindrical body having openings at both ends. Specifically, the housing 20 is a straight tubular outer tube and is made of a transparent resin material or glass. The casing 20 is a cylinder whose cross section in the short direction (XZ cross section) is circular. Note that one end of the casing 20 in the longitudinal direction is covered with a power supply cap 30. Further, the other end portion of the casing 20 in the longitudinal direction is covered with a non-power feeding base 40.

  For example, the casing 20 is a glass bulb (clear bulb) made of silica glass that is transparent to visible light. In this case, the LED module 10 disposed in the housing 20 can be viewed from the outside of the housing 20.

  Specifically, the housing 20 is a glass tube (glass bulb) containing soda-lime glass having 70 to 72% silica as a main component and having a thermal conductivity of about 1.0 W / m · K. Alternatively, the housing 20 may be a plastic tube containing a resin material such as acrylic (PMMA) or polycarbonate (PC).

  In addition, in order to diffuse the light from the LED module 10, the housing | casing 20 may have a light-diffusion function. For example, a light diffusion sheet or a light diffusion film may be formed on the inner surface or the outer surface of the housing 20. Specifically, a milky white light diffusing film can be formed by attaching a resin containing a light diffusing material (fine particles) such as silica or calcium carbonate, or a white pigment to the inner surface or the outer surface of the housing 20. it can.

  Further, the light diffusing function may be realized by a lens structure provided inside or outside the housing 20, or a concave portion or a convex portion formed on the inner surface or the outer surface of the housing 20. For example, the light diffusion function can be realized by printing a dot pattern on the inner surface or the outer surface of the housing 20 or processing a part of the housing 20. Alternatively, the light diffusing function can be realized by molding the housing 20 itself using a resin material in which a light diffusing material is dispersed.

  Thus, by providing the housing 20 with the light diffusing function, it is possible to diffuse the light emitted from the LED module 10 when the light passes through the housing 20. For example, if the SMD type LED elements 12 are arranged apart from each other as in the present embodiment, there is a possibility that a light crushing feeling (luminance variation) may occur. On the other hand, by providing the housing 20 with a light diffusing function, it is possible to suppress the feeling of being crushed.

[Feeding cap]
The power supply base 30 is a power supply base for supplying power to the LED module 10. The feeding base 30 is provided at one end of the casing 20 or the substrate 11 in the longitudinal direction (Y-axis direction). The power supply cap 30 receives power for lighting the LED element 12 from the outside of the lamp.

  The power supply cap 30 is configured in a cap shape so as to cover one end of the casing 20 in the longitudinal direction. That is, the power supply cap 30 has a bottomed cylindrical shape and is provided so as to cover one end of the housing 20 in the longitudinal direction. For example, the power supply cap 30 is bonded to one end of the housing 20 with an adhesive. In the present embodiment, the power supply cap 30 is a cylinder having an opening on one side and a bottom on the other side.

  In addition, the adhesive agent used for adhesion | attachment with the nozzle | cap | die 30 for electric power feeding and the housing | casing 20 is a silicone resin, for example. For example, the adhesive used for bonding the power supply base 30 and the housing 20 is made of the same material as the adhesive 60 used for connecting the substrate 11 and the housing 20. At this time, one end portion of the substrate 11 protruding from the housing 20 and the power supply base 30 may be fixed with an adhesive.

  As shown in FIG. 1, the power supply base 30 includes a base body 31 and power supply pins 32.

  The base body 31 is provided at one end of the casing 20 in the longitudinal direction. For example, the base body 31 is a cylindrical base body and forms an outer shell of the power supply base 30. The base body 31 holds the power supply pin 32.

  Specifically, the base body 31 is a cylindrical base body having an opening and a bottom. The base body 31 according to the present embodiment has a bottomed cylindrical shape, and has a circular opening and a disc-shaped bottom.

  The base body 31 is made of a resin material such as polybutylene terephthalate (PBT). Here, the power supply cap 30 is produced, for example, by insert molding using a power supply pin 32 and a resin material. Note that the power supply base 30 can be manufactured by press-fitting the power supply pins 32 into the base body 31 that is a resin molded body.

  The power supply pin 32 is an example of a base pin and is provided on the base body 31. Specifically, the power supply pins 32 are a pair of conductive pins that receive power for causing the LED module 10 to emit light from an external device such as a lighting fixture.

  For example, the power feed pin 32 is made of a metal material such as brass. By attaching the power supply pin 32 to the receiving fixture of the lighting fixture, the power supply pin 32 can receive DC power from a power supply device built in the lighting fixture.

  Specifically, the power supply pin 32 is provided so as to penetrate the bottom of the base body 31. The power feed pin 32 protrudes outward from the outer surface of the bottom portion of the base body 31 and protrudes from the inner surface of the bottom portion of the base body 31 toward the opening. A portion of the power supply pin 32 that protrudes from the inner surface of the bottom portion of the base body 31 toward the opening is connected to the metal electrodes 13 a and 13 b of the substrate 11 by lead wires 50.

  Note that the power supply cap 30 according to the present embodiment is a GX16t-5 cap (L-shaped pin cap) in a straight tube LED lamp conforming to “JIS C 7709-1”. It is.

[Non-powered cap]
The non-power supply base 40 is a non-power supply side base having a function of attaching the straight tube LED lamp 1 to a lighting fixture. As shown in FIG. 1, the non-power feeding base 40 is provided at the other end of the casing 20 or the substrate 11 in the longitudinal direction (Y-axis direction). That is, the non-power feeding base 40 is provided at the end opposite to the longitudinal end (one end) of the housing 20 in which the power feeding base 30 is provided. Note that the non-power supply base 40 may ground (ground) a predetermined region of the LED module 10 via a lighting fixture.

  The non-power feeding base 40 is configured in a cap shape so as to cover the other end in the longitudinal direction of the housing 20. That is, the non-power feeding base 40 has a bottomed cylindrical shape and is provided so as to cover the other end portion in the longitudinal direction of the housing 20. For example, the non-power supply base 40 is bonded to the other end of the housing 20 with an adhesive. In the present embodiment, the non-power feeding base 40 is a cylinder having an opening on one side and a bottom on the other side.

  The adhesive used for bonding the non-power feeding base 40 and the housing 20 is, for example, a silicone resin. For example, the adhesive used for bonding the non-power feeding base 40 and the housing 20 is made of the same material as the adhesive 60 used for connecting the substrate 11 and the housing 20. At this time, the other end of the substrate 11 protruding from the housing 20 and the non-power feeding base 40 may be fixed with an adhesive.

  As shown in FIG. 1, the non-power supply base 40 includes a base body 41 and a non-power supply pin 42.

  The base body 41 is provided at the other end in the longitudinal direction of the housing 20. For example, the base body 41 is a cylindrical base body and forms an outer shell of the non-power feeding base 40. The base body 41 holds the non-power supply pin 42.

  Specifically, the base body 41 is a cylindrical base body having an opening and a bottom. The base body 41 according to the present embodiment has a bottomed cylindrical shape, and has a circular opening and a disk-shaped bottom.

  The base body 41 is made of a resin material such as polybutylene terephthalate. Here, the non-power supply base 40 is produced by insert molding using the non-power supply pin 42 and a resin material, for example. In addition, the non-power feeding base 40 can also be produced by press-fitting the non-power feeding pins 42 into the base body 41 which is a resin molded body.

  The non-power supply pin 42 is an example of a cap pin, and is an attachment pin for attaching the straight tube LED lamp 1 to a lighting fixture. For example, the non-feed pin 42 is a conductive pin having a T-shaped cross section made of a metal material such as brass.

  The non-power supply pin 42 is provided so as to protrude outward from the bottom of the base body 41. The non-power supply pin 42 is not exposed on the inner surface side of the base body 41 and is embedded in the base body 41. Note that the non-power supply pin 42 may be provided so as to penetrate the bottom of the base body 41. Specifically, the non-power supply pin 42 may protrude outward from the outer surface of the bottom portion of the base body 41 and may protrude from the inner surface of the bottom portion of the base body 41 toward the opening.

[Lead]
As shown in FIG. 2, the lead wire 50 is a conducting wire for supplying power to the LED element 12 having one end connected to the power supply pin 32 and the other end connected to the substrate 11. Specifically, one end of each of the two lead wires 50 is connected to a power feed pin 32 that is a pair of conductive pins. In addition, the other end of each of the two lead wires 50 is connected to the metal electrode 13 a or 13 b of the substrate 11.

  The lead wire 50 is formed by twisting thin copper wires or the like, for example, and the surface is covered with an insulating member such as polyvinyl chloride or silicone rubber. Specifically, a conductive metal wire or the like is exposed at both ends of the lead wire 50, and a portion excluding both ends is covered with an insulating member. The lead wire 50 includes a metal exposed portion (both end portions) and a covering portion (portion excluding both ends).

  The lead wire 50 is soldered to the power supply pin 32 and the metal electrodes 13a and 13b, for example.

  Note that a connection terminal may be provided at the end of the lead wire 50, and the lead wire 50 may be connected to the connection terminal provided on the substrate 11 instead of the metal electrodes 13a and 13b. The connection terminal is an external connection terminal (electrode terminal) that receives DC power for causing the LED element 12 to emit light from the outside of the LED module 10. Specifically, the connection terminal is a connector having a resin-type base and a conductive portion (pin) for receiving DC power. The conductive portion is connected to the lighting circuit through the metal wiring 13. Thus, the end portion of the lead wire 50 may be connected to the main surface of the substrate 11 by a connector.

[adhesive]
As shown in FIG. 2, the adhesive 60 is intermittent between the inner surface of the housing 20 and the second main surface (back surface) of the substrate 11 in order to bond and fix the housing 20 and the LED module 10. Applied. That is, the substrate 11 is fixed to the housing 20 by the adhesive 60 at a plurality of positions different from each other in the longitudinal direction of the substrate 11.

  As the adhesive 60, it is preferable to use a material having a thermal conductivity of 1 W / m · K or more from the viewpoint of heat dissipation. Further, from the viewpoint of weight reduction, it is preferable to use a material having a specific gravity of 2 or less as the adhesive 60. For example, as the adhesive 60, an adhesive made of silicone resin or cement can be used.

  Instead of the adhesive 60, a double-sided tape having a thickness and a shape that can adhere to the second main surface of the substrate 11 and the inner surface of the housing 20 may be used. That is, any member that can fix the substrate 11 and the housing 20 may be used.

[Effects, etc.]
Next, the effect of providing the groove 14 in the substrate 11 according to the present embodiment will be described with reference to FIG. FIG. 4 is a cross-sectional view for explaining the effect of the groove 14 provided in the substrate 11 according to Embodiment 1 of the present invention. FIG. 4 is a partially enlarged view of the cross section shown in FIG. For simplicity, FIG. 4 shows only the LED module 10 and the adhesive 60, and the housing 20 and the like are not shown.

  FIG. 4A shows a state where power is not supplied to the LED element 12. When power is not supplied to the LED element 12, the LED element 12 does not generate heat. For this reason, the substrate 11 does not thermally expand.

  When power is supplied to the LED element 12, the LED element 12 generates heat. Since the heat from the LED element 12 conducts heat to the substrate 11, the substrate 11 expands due to the heat. Since the board | substrate 11 is being fixed to the housing | casing 20 with the adhesive agent 60 in the some position, as shown in FIG.4 (b), the board | substrate 11 is upwards with the adhesive agent 60 of two adjacent places as a fulcrum. Deflection.

  In the present embodiment, a weak portion with weak mechanical strength, specifically, a groove 14 is provided between two adjacent adhesives 60, so that the substrate 11 bends to a predetermined value or more. As shown in FIG. 4C, the substrate 11 is broken in the region where the groove 14 is provided. When the substrate 11 is broken, the metal wiring 13 provided on the main surface of the substrate 11 is also physically broken. For this reason, power is not supplied to the LED element 12 and the lighting circuit.

  When the substrate 11 bends beyond a predetermined value, a load may be applied to the LED element 12 or the like, causing problems such as poor energization. If an attempt is made to further supply power to the LED element 12 after the trouble has occurred, there is a possibility that a further trouble may occur, which is not preferable. For this reason, when the board | substrate 11 bends more than predetermined value, it is not preferable to supply electric power to the LED element 12 continuously.

  Therefore, as shown in FIGS. 4A to 4C, the breakage of the substrate 11 can be promoted by providing the grooves 14. That is, when the substrate 11 is bent, the substrate 11 can be easily broken, and the metal wiring 13 can be easily broken physically.

  Thereby, since electric power is no longer supplied to LED element 12, generation | occurrence | production of the further malfunction can be suppressed. That is, according to straight tube | pipe LED lamp 1 which concerns on this Embodiment, when a malfunction arises, it can suppress continuing use in an unstable state.

  As described above, the straight tube LED lamp 1 according to the present embodiment includes the elongated casing 20 and the elongated substrate 11 disposed in the casing 20, and the substrate 11 includes: A plurality of LED elements 12 arranged side by side in the longitudinal direction and a metal wiring 13 for supplying power to the plurality of LED elements 12 are provided, and the substrate 11 has first and second positions adjacent to each other in the longitudinal direction. The board 11 is fixed at a position, and the board 11 is provided with a weak part between the first position and the second position where the board 11 has a lower mechanical strength than the others.

  Thereby, since the weak part with mechanical strength weaker than others is provided in the board | substrate 11, when the board | substrate 11 bends, the fracture | rupture of the board | substrate 11 is accelerated | stimulated by a weak part. That is, the substrate 11 is easily broken compared to the case where there is no fragile portion.

  For this reason, for example, when the board | substrate 11 bends more than predetermined value, it can be made easy to fracture | rupture, and the metal wiring 13 can be easily broken physically. When the metal wiring 13 is physically broken, no power is supplied to the LED element 12, so that further troubles can be suppressed. Therefore, it is possible to prevent the use from being continued in an unstable state when a problem occurs. In particular, when the thickness and width of the substrate 11 are reduced for the purpose of cost reduction, the deflection of the substrate 11 is increased, and therefore, the configuration in which the fragile portion according to the present embodiment is provided is more useful.

  Moreover, in the straight tube LED lamp 1 according to the present embodiment, in the cross section orthogonal to the longitudinal direction of the substrate 11, the cross sectional area of the cross section including the fragile portion is smaller than the cross sectional area of the cross section not including the fragile portion.

  Thereby, since the cross-sectional area including a weak part is smaller than others, the board | substrate 11 can be made to be easy to be fracture | ruptured in the place where the weak part was provided.

  Further, in the straight tube LED lamp 1 according to the present embodiment, the fragile portion is a groove 14 provided so as to intersect the longitudinal direction of the substrate 11.

  Thereby, since the weak part is the groove | channel 14, the board | substrate 11 can be made to be easy to fracture | rupture in the place in which the groove | channel 14 was provided.

  In the straight tube LED lamp 1 according to the present embodiment, the plurality of LED elements 12 and the metal wiring 13 are provided on the first main surface of the substrate 11, and the groove 14 is the second opposite to the first main surface. Provided on the main surface.

  Thereby, since the groove 14 is provided on the main surface opposite to the metal wiring 13, the groove 14 can be provided regardless of the wiring pattern of the metal wiring 13.

  Moreover, in the straight tube | pipe LED lamp 1 which concerns on this Embodiment, a weak part is provided between two adjacent LED elements.

  Thus, since a weak part is provided between the LED elements 12 adjacent, a weak part is provided in the area | region where the LED element 12 is not arrange | positioned. Since the LED element 12 functions as a reinforcing material for the substrate 11 in the region where the LED element 12 is disposed, the mechanical strength of the substrate 11 is increased compared to the region where the LED element 12 is not disposed. For this reason, the breakage of the substrate 11 can be further promoted by providing the fragile portion in the region where the LED element 12 is not disposed.

  Moreover, in the straight tube | pipe LED lamp 1 which concerns on this Embodiment, a weak part is provided in the center area | region of a 1st position and a 2nd position.

  The two central regions where the substrate 11 is fixed are the portions where the deflection of the substrate 11 is the largest and the greatest stress is applied. Therefore, the breakage of the substrate 11 can be further promoted by providing the weakened portion in the central region.

  In the straight tube LED lamp 1 according to the present embodiment, the substrate 11 is fixed to the inner surface of the housing 20 by the adhesive 60 at the first position and the second position.

  Thereby, since the board | substrate 11 is being fixed to the housing | casing 20 with the adhesive agent 60, the base (heat sink) etc. for fixing the board | substrate 11 are not required, for example, a number of parts is reduced and the efficiency of assembly work is reduced. Improvement and weight reduction can be realized.

  Further, in the straight tube LED lamp 1 according to the present embodiment, the adhesive 60 is a silicone resin.

  In addition, when the board | substrate 11 and the housing | casing 20 are being fixed in the position of N places (N is an integer greater than or equal to 3), a weak part may be provided in N-1 places. Specifically, among the plurality of adhesives 60 (N adhesives 60) that fix the substrate 11 and the housing 20, weak portions (N−1 weak portions) are formed between the adjacent adhesives 60. ) May be provided. Or you may provide a weak part only in any one place.

  Moreover, you may provide a weak part between the lighting circuit and the LED element 12. FIG.

  A plurality of weak parts may be provided between the first position and the second position. Specifically, two or more grooves 14 may be provided between two adjacent adhesives 60.

  Moreover, although the example which has an area | region with a small cross-sectional area was shown as an example of a weak part, it is not restricted to this. For example, the material of the substrate 11 may be different. For example, a portion made of a material that is more brittle than the region other than the portion may be provided between the first position and the second position.

(Modification 1 of Embodiment 1)
Then, the LED module 10a which concerns on the modification 1 of Embodiment 1 of this invention is demonstrated using FIG. FIG. 5 is a plan view showing an example of an LED module according to Modification 1 of Embodiment 1 of the present invention. 5A shows a plane of the LED module 10a, and FIG. 5B shows a side surface of the LED module 10a.

  The LED module 10 a is a light source of the straight tube LED lamp 1. As shown in FIG. 5A, the LED module 10a includes a substrate 11a, a plurality of LED elements 12 mounted on the substrate 11a, and a lighting circuit (not shown) for lighting the plurality of LED elements 12. And a plurality of LED elements 12 and metal wiring 13 patterned in a predetermined shape for electrically connecting the lighting circuit. In the following description, components that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and description thereof may be omitted.

  The substrate 11a is different from the substrate 11 according to the first embodiment in that a plurality of through hole groups 14a each including a plurality of through holes 14b are provided instead of the grooves 14.

  The through-hole group 14a is an example of a weak part. The through hole group 14 a includes a plurality of through holes 14 b that penetrate the main surface of the substrate 11. For example, as shown to (a) of FIG. 5, the several through-hole 14b contained in the through-hole group 14a is provided along with the transversal direction of the board | substrate 11a. Specifically, the plurality of through holes 14b have a perforation structure provided in the short direction of the substrate 11a. The through hole 14b is provided in a region different from the region where the metal wiring 13 is provided.

  The through-hole group 14a is provided between two adjacent adhesives 60 as shown in FIG. Since the plurality of through holes 14b function like a perforated structure provided in the short direction of the substrate 11a, the substrate 11a is easily broken by the through hole group 14a when the substrate 11a is bent. Yes.

  As described above, in the straight tube LED lamp 1 according to the first modification of the present embodiment, the fragile portion is the through hole 14b.

  Thereby, since the weak part is the through-hole 14b, the board | substrate 11a can be made to be easy to be fracture | ruptured in the place in which the through-hole 14b was provided.

  One through hole 14b may be provided instead of the through hole group 14a. Also in this case, in the cross section orthogonal to the longitudinal direction of the substrate 11a, the cross sectional area of the cross section passing through the through hole 14b is smaller than the cross sectional area of the cross section of the region where the through hole 14b is not provided. For this reason, the region in which the through hole 14b is provided has weak mechanical strength, and is easily broken when the substrate 11a is bent. At this time, it is preferable that one through-hole 14b is an ellipse or a rectangle which has a long axis in the short direction of the board | substrate 11a.

  Moreover, although the example which provides the through-hole 14b which penetrates the main surface of the board | substrate 11a was shown, you may provide the through-hole which penetrates the side surface of the board | substrate 11. FIG. For example, you may provide the through-hole penetrated in the transversal direction from the end surface of the transversal direction of the board | substrate 11.

(Modification 2 of Embodiment 1)
Then, the LED module 10b which concerns on the modification 2 of Embodiment 1 of this invention is demonstrated using FIG. FIG. 6 is a plan view showing an example of an LED module according to Modification 2 of Embodiment 1 of the present invention. 6A shows a plane of the LED module 10b, and FIG. 6B shows a side surface of the LED module 10b.

  The LED module 10 b is a light source of the straight tube LED lamp 1. As shown in FIG. 6A, the LED module 10b includes a substrate 11b, a plurality of LED elements 12 mounted on the substrate 11b, and a lighting circuit (not shown) for lighting the plurality of LED elements 12. And a plurality of LED elements 12 and metal wiring 13 patterned in a predetermined shape for electrically connecting the lighting circuit. In the following description, components that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and description thereof may be omitted.

  The substrate 11b is different from the substrate 11 according to the first embodiment in that a plurality of slits 14c are provided instead of the grooves 14 respectively.

  The slit 14c is an example of a weak part. For example, as shown in FIG. 6A, the slit 14c is provided so as to be cut out in the lateral direction from the edge in the lateral direction of the substrate 11b. The slit 14c is provided in a region different from the region where the metal wiring 13 is provided.

  The plurality of slits 14 c are provided between two adjacent adhesives 60 as shown in FIG. When the substrate 11b is bent, the substrate 11b is easily broken by the slit 14c.

  As described above, in the straight tube LED lamp 1 according to the first modification of the present embodiment, the fragile portion is the slit 14c.

  Thereby, since a weak part is the slit 14c, the board | substrate 11 can be made easy to be fracture | ruptured in the place in which the slit 14c was provided.

  In the example shown in FIG. 6, the slit 14 c is provided by notching from one edge of the substrate 11 b in the short direction, but a plurality of notches are provided by notching from both edges of the substrate 11 b in the short direction. A slit 14c may be provided. That is, a plurality of slits 14 c may be provided on the substrate 11 b between two adjacent adhesives 60.

(Embodiment 2)
An illumination device according to Embodiment 2 of the present invention is an illumination device including the above-described illumination light source. For example, the illumination device according to the second embodiment includes the straight tube LED lamp 1 according to the first embodiment.

  FIG. 7 is a schematic perspective view showing an example of the illumination device 2 according to Embodiment 2 of the present invention. As illustrated in FIG. 7, the lighting device 2 according to the second embodiment is a base light, and includes a straight tube LED lamp 1 and a lighting fixture 200.

  The straight tube LED lamp 1 is the straight tube LED lamp 1 according to Embodiment 1, and is used as an illumination light source of the illumination device 2. In addition, the illuminating device 2 which concerns on this Embodiment is provided with the two straight tube | pipe LED lamps 1 as an example.

  The lighting fixture 200 includes a pair of metal receivers 210 electrically connected to the straight tube LED lamp 1 and holding the straight tube LED lamp 1, and a device main body 220 to which the metal receiver 210 is attached.

  The instrument main body 220 can be formed by, for example, pressing an aluminum steel plate. Further, the surface has a function of a reflecting surface that reflects light emitted from the straight tube LED lamp 1 in a predetermined direction (for example, downward).

  The lighting fixture 200 is mounted on a ceiling or the like via a fixture, for example. The lighting fixture 200 may include a circuit for controlling lighting of the straight tube LED lamp 1 or the like, and a cover member may be provided so as to cover the straight tube LED lamp 1. .

  As described above, in the lighting device 2 according to the present embodiment, the substrate 11 is provided with the weakened portion having the mechanical strength of the substrate 11 that is weaker than the other, as in the other embodiments. When 11 is bent, breakage of the substrate 11 is promoted by the fragile portion. That is, the substrate 11 is easily broken compared to the case where there is no fragile portion.

  For this reason, for example, when the board | substrate 11 bends more than a regulation value, it can be made easy to fracture | rupture, and the metal wiring 13 can be made easy to be physically fractured. When the metal wiring 13 is physically broken, no power is supplied to the LED element 12, so that further troubles can be suppressed. Therefore, according to the illuminating device 2 which concerns on this Embodiment, when a malfunction arises, it can suppress that a use will be continued in an unstable state.

(Other)
The illumination light source and the illumination device according to the present invention have been described based on the above embodiment, but the present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the case where the LED module is an SMD type LED module using a packaged LED element has been described. The LED module may be a COB (Chip On Board) type LED module in which a plurality of LED chips are directly mounted on a substrate and the plurality of LED chips are collectively sealed with a phosphor-containing resin.

  In the above embodiment, an example in which the connection member (power supply pin) and the lead wire are connected by soldering has been described, but a conductive adhesive may be used instead of solder.

  Two or more substrates (LED modules) arranged in the housing may be arranged in series or in parallel. In this case, metal wiring provided on each substrate may be connected via the connection terminal.

  Moreover, a housing | casing may be comprised by the elongate translucent cover which covers an LED module, and a base, for example. In this case, the LED module is placed on a base, for example. That is, the housing does not have to be an integral housing, and may be a housing that can be divided into a plurality of parts, such as a housing made of a translucent cover and a base.

  Moreover, although the said embodiment demonstrated the example in which a housing | casing and a nozzle | cap | die are cylinders, it is not restricted to this. For example, the casing and the base may be a rectangular tube having a rectangular bottom and opening.

  In the above embodiment, the base body is an example of a cylinder having a substantially uniform outer diameter and inner diameter, but is not limited thereto. For example, at least one of the outer diameter and the inner diameter of the base body may be non-uniform.

  Further, the base body may not have a bottom portion. That is, the base body may be a cylindrical body having openings at both ends.

  Moreover, the edge part of a housing | casing may cover a nozzle | cap | die. That is, the outer diameter of the base may be smaller than the inner diameter of the end portion of the casing.

  Further, for example, in the above-described embodiment, a single-side power feeding method that feeds power to all LEDs in the housing from only one side of the power feeding base is adopted. However, both the bases on both sides use a G13 base and an L-shaped base. You may employ | adopt the both-sides electric power feeding system, such as. In this case, the power supply pin on one side and the power supply pin on the other side may be configured as one pin. Alternatively, the power supply pin on one side and the power supply pin on the other side may receive power from both sides as a pair of power supply pins. Further, the pair of power supply pins or non-power supply pins is not limited to a rod-shaped metal, and may be configured by a flat metal or the like.

  Furthermore, from the aspect of the power feeding method, the straight tube LED lamp according to the present invention includes, for example, the following variations. That is, one-sided feeding method composed of an L-shaped base on one side and a base having a non-feeding pin on the other side, a two-sided feeding method composed of L-shaped bases on both sides, a one-sided feeding system composed of L-shaped bases on both sides, These include a double-sided power feeding system configured with a G13 base and a one-sided power feeding system configured with a G13 base.

  In addition, the straight tube LED lamp according to the above embodiment is a system that receives DC power from an external power supply, but receives AC power from an external power supply by incorporating a power supply circuit (AC-DC converter circuit). It may be a method.

  In the above embodiment, the LED module is configured to emit white light by the blue LED chip and the yellow phosphor. However, the present invention is not limited to this. For example, a phosphor-containing resin containing a red phosphor and a green phosphor may be used and combined with this and a blue LED chip to emit white light. Moreover, you may use the LED chip which light-emits colors other than blue, for example, using the ultraviolet LED chip which emits the ultraviolet light which is shorter wavelength than the blue light which a blue LED chip emits, mainly by ultraviolet light You may comprise so that white light may be discharge | released by the blue fluorescent substance particle which is excited, and discharge | releases blue light, red light, and green light, green fluorescent substance particle, and red fluorescent substance particle.

  In the above embodiment, the LED is exemplified as the light emitting element. However, a semiconductor light emitting element such as a semiconductor laser, a light emitting element such as an organic EL (Electro Luminescence), or an inorganic EL may be used.

  In addition, the embodiment can be realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, or a form obtained by subjecting each embodiment to various modifications conceived by those skilled in the art. Forms are also included in the present invention.

1 Straight tube LED lamp (light source for illumination)
2 Lighting device 10, 10a, 10b LED module 11, 11a, 11b Substrate 12 LED element 13 Metal wiring 13a, 13b Metal electrode 14 Groove (fragile part)
14a Through-hole group 14b Through-hole 14c Slit 20 Case 30 Feed base 31, 41 Base body 32 Feed pin 40 Non-feed base 42 Non-feed pin 50 Lead wire 60 Adhesive 200 Lighting fixture 210 Receptacle 220 Instrument body

Claims (10)

A long casing;
An elongated substrate disposed in the housing,
The substrate is provided with a plurality of light emitting elements arranged side by side in the longitudinal direction, and metal wiring for supplying power to the plurality of light emitting elements,
The substrate is fixed to the housing at a first position and a second position that are adjacent in the longitudinal direction,
The light source for illumination in which the board | substrate is provided with the weak part from which the mechanical strength of the said board | substrate is weaker than others between the said 1st position and the said 2nd position. The light source for illumination according to claim 1, wherein a cross-sectional area of a cross section including the fragile portion is smaller than a cross-sectional area of a cross section not including the fragile portion in a cross section orthogonal to the longitudinal direction of the substrate. The illumination light source according to claim 1, wherein the fragile portion is a groove provided so as to intersect with a longitudinal direction of the substrate. The plurality of light emitting elements and the metal wiring are provided on a first main surface of the substrate,
The illumination light source according to claim 3, wherein the groove is provided on a second main surface opposite to the first main surface. The illumination light source according to claim 1, wherein the fragile portion is a through hole or a slit. The illumination light source according to claim 1, wherein the fragile portion is provided between the adjacent first light emitting element and second light emitting element included in the plurality of light emitting elements. The illumination light source according to any one of claims 1 to 6, wherein the fragile portion is provided in a central region between the first position and the second position. The light source for illumination according to any one of claims 1 to 7, wherein the substrate is fixed to an inner surface of the housing by an adhesive at the first position and the second position. The illumination light source according to claim 8, wherein the adhesive is a silicone resin.   An illuminating device provided with the illumination light source of any one of Claims 1-9.

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