JP6288434B2 - Illumination light source and illumination device - Google Patents

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, in a straight tube LED lamp using a light-emitting element such as an LED, when the straight tube LED lamp is viewed from a direction perpendicular to the optical axis of the light-emitting element, light collapse (brightness variation) occurs. There is a fear.

  Therefore, an object of the present invention is to provide an illumination light source and an illumination device that can suppress a feeling of being crushed when viewed from a direction perpendicular to the optical axis of a light emitting element.

  In order to achieve the above object, an illumination light source according to one embodiment of the present invention includes a long housing and a long substrate that is disposed in the housing and on which a plurality of light-emitting elements are disposed. The housing has a light diffusion function of diffusing light from the light emitting element, and the light emitting element is perpendicular to the optical axis of the light emitting element and is short of the housing. The light diffusing function of the side part located on the side is larger than the light diffusing function of the front part located on the optical axis of the light emitting element in the housing.

  The housing may contain light diffusing particles, and the amount of the light diffusing particles in the side portion may be larger than the amount of the light diffusing particles in the front portion.

  In addition, the distance that the light from the light emitting element passes through the side part may be larger than the distance that the light from the light emitting element passes through the front part.

  In addition, in a cross section perpendicular to the longitudinal direction of the casing, the thickness of the casing may increase as it approaches the side portion from the front portion.

  The concentration of the light diffusing particles in the side portion may be higher than the concentration of the light diffusing particles in the front portion.

  Moreover, the said housing | casing may be equipped with the translucent member which has translucency, and the light-diffusion film which covers the said translucent member and contains the said light-diffusion particle.

  In the housing, the distance from the light emitting element to the inner surface of the side part may be larger than the distance from the light emitting element to the inner surface of the front part.

  The casing is a cylindrical body having an elliptical cross section perpendicular to the longitudinal direction of the casing, and a diameter in a direction perpendicular to the optical axis of the light emitting element in the cross section perpendicular to the longitudinal direction of the casing. May be larger than the diameter in the direction parallel to the optical axis of the light emitting element.

  Moreover, the said housing | casing may have the uneven | corrugated | grooved part repeatedly formed in at least one of the inner surface and the outer surface.

  Moreover, the surface roughness of the uneven part in the side part may be higher than the surface roughness of the uneven part in the front part.

  An illumination device according to one embodiment of the present invention includes the illumination light source.

  ADVANTAGE OF THE INVENTION According to this invention, the crushing feeling of the light which generate | occur | produces when it sees from the orthogonal | vertical direction with respect to the optical axis of a light emitting element can be suppressed.

1 is an overview perspective view showing an example of a straight tube LED lamp according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view of a part of an example of the straight tube LED lamp according to Embodiment 1 cut along an XZ plane. 3A is a side view for explaining a comparative example of the straight tube LED lamp according to Embodiment 1. FIG. 3B is a side view seen from the X direction for explaining an example of the effect of the housing according to Embodiment 1. FIG. FIG. 4 is a cross-sectional view of a part of an example of a straight tube LED lamp according to Modification 1 of Embodiment 1 cut along an XZ plane. FIG. 5 is a cross-sectional view of a portion of an example of a straight tube LED lamp according to Modification 2 of Embodiment 1 cut along an XZ plane. FIG. 6 is a cross-sectional view of a portion of an example of a straight tube LED lamp according to Modification 3 of Embodiment 1 cut along an XZ plane. FIG. 7 is a cross-sectional view of a part of an example of a straight tube LED lamp according to Embodiment 2 cut along an XZ plane. FIG. 8 is an overview perspective view showing an example of a lighting apparatus according to Embodiment 3.

  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 includes a long housing and a long substrate disposed in the housing and on which a plurality of light emitting elements are disposed. The light diffusing function of the side part located on the side of the light emitting element in the lateral direction of the casing and perpendicular to the optical axis of the light emitting element is included in the casing. It is larger than the light diffusion function of the front part located on the optical axis of the light emitting element. The straight tube LED lamp according to the present embodiment is an example of a straight tube LED lamp that replaces a conventional straight tube fluorescent lamp.

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

  FIG. 1 is a schematic perspective view showing an example of a straight tube LED lamp 1 according to Embodiment 1 of the present invention. As shown in FIG. 1, a straight tube LED lamp 1 includes an LED module 10, a long casing 20, and a base 30 fixed to each end of the casing 20 in the longitudinal direction (tube axis direction). And a base 40. 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.

  Hereinafter, each component of the straight tube LED lamp 1 will be described in detail with reference to FIG. FIG. 2 is a cross-sectional view of a part of an example of the straight tube LED lamp according to Embodiment 1 of the present invention cut along an XZ plane.

[LED module]
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. Here, the LED module 10 is disposed so that the end portion protrudes from the housing 20.

  The LED module 10 according to the present embodiment is a surface mount device (SMD) type light emitting module, and includes a module substrate 11 and a plurality of LED elements 12 mounted on the module substrate 11. Although not shown, the LED module 10 further includes a lighting circuit for lighting the plurality of LED elements 12.

[Module board]
The module substrate 11 is an embodiment of the substrate, and is, for example, a rectangular substrate whose longitudinal direction (the Y-axis direction in FIG. 1) is parallel to the longitudinal direction of the straight tubular casing 20 and is short. It arrange | positions in the housing | casing 20 so that a direction (X-axis direction of FIG. 1) may become parallel to the transversal direction of the housing | casing 20. FIG. The module substrate 11 is fixed to the inner surface of the housing 20 with an adhesive 50, for example. Alternatively, the module substrate 11 may be placed on a placement surface of a heat sink (base) fixed in the housing 20. The adhesive 50 used for bonding the module substrate 11 and the housing 20 is, for example, silicone resin or cement.

  The module 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. On the main surface of the module substrate 11, a plurality of LED elements 12 are arranged side by side in the longitudinal direction of the module substrate 11. The module substrate 11 is longer than the housing 20 in the longitudinal direction.

  Specifically, the module substrate 11 is a mounting substrate for mounting the LED element 12. The module 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 module substrate 11.

  One end of the module substrate 11 in the longitudinal direction is covered with a base 30. For example, the module substrate 11 is arranged so that the end portion protrudes from the housing 20, and at least the protruding portion is covered with the base 30.

  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 module substrate 11. Since the white resist has high light reflectivity, the light extraction efficiency of the LED module 10 can be improved. Moreover, by forming the white resist, the insulation (withstand voltage) of the module substrate 11 can be improved, and oxidation of the metal wiring can be suppressed.

[LED element]
The LED element 12 is an embodiment of a light emitting element, and is mounted on the module 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 module substrate 11. As shown in FIG. 1, 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 formed on the module substrate 11 are electrically connected.

[Case]
The casing 20 is a long casing in which the module 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 has a light diffusion function of diffusing light from the LED element 12. The housing 20 is perpendicular to the optical axis of the LED element 12 and is a housing. The light diffusing function of the side part located on the side of the LED element 12 in the lateral direction of the body 20 is larger than the light diffusing function of the front part of the housing 20 located on the optical axis of the LED element 12. Thereby, it is possible to suppress the crushing feeling of light generated when the straight tube LED lamp 1 is viewed from the direction perpendicular to the optical axis of the LED element 12. That is, it is possible to suppress the feeling of light being crushed at the side portion.

  Such a crushed feeling of light is caused by, for example, luminance variations caused by the LED elements 12 being spaced apart. Specifically, in the cross-sectional view of FIG. 2, the side portion of the LED element 12 in the lateral direction of the housing 20 is closer to the inner wall of the housing 20 from the LED element 12 than the optical axis direction of the LED element 12. The distance to the part is short. For this reason, if the light diffusing functions of the housing 20 are all equal in the circumferential direction, the crushing feeling is recognized more conspicuously in the side portion than in the optical axis direction.

  In particular, when the LED element 12 is of the SMD type, the LED chip is disposed in the inverted frustoconical concave portion (cavity) of the container formed of white resin or the like, so that the side portion of the housing 20 can be obtained. Is behind the container with respect to the LED chip. Therefore, the crushed feeling of light in the side portion is likely to be larger than that in the front portion.

  Moreover, the straight tube LED lamp 1 is attached so that the front part of the housing | casing 20 may become the irradiation direction of a lighting fixture at the time of attachment to a lighting fixture. In other words, it attaches so that the back surface of the board | substrate 11 may oppose a lighting fixture. Therefore, the irradiation direction can be brightly illuminated by increasing the light transmittance in the front portion of the housing 20. Here, the light transmittance has a property of becoming lower as the light diffusion function is larger. Therefore, a decrease in light transmittance can be suppressed by reducing the light diffusion function in the front part.

  Therefore, in the present embodiment, by making the light diffusion function of the side part larger than the light diffusion function of the front part, it is possible to suppress the light collapse feeling in the side part where the light collapse feeling tends to increase. While being able to suppress, the fall of the light transmittance in a front part can be suppressed.

  Hereinafter, the configuration of the housing 20 will be described in more detail.

  For example, as shown in FIG. 2, the housing 20 contains light diffusing particles 22, and the amount of the light diffusing particles 22 in the side portion is larger than the amount of the light diffusing particles 22 in the front portion. Thereby, the light emitted from the LED element 12 to the side part is diffused more than the light emitted from the LED element 12 to the front part. Accordingly, it is possible to suppress the feeling of light being crushed at the side portion.

  For example, the housing 20 is configured by molding a base material 21 made of a transparent resin material or glass in which light diffusion particles 22 are dispersed. For example, the base material 21 is a glass containing soda lime glass containing 70 to 72% silica as a main component and having a thermal conductivity of about 1.0 W / m · K. Alternatively, it is a resin such as acrylic (PMMA) or polycarbonate (PC). Further, for example, the light diffusion particle 22 is a light diffusion material (fine particles) such as silica or calcium carbonate, or a white pigment.

  Here, the light diffusing particles 22 are contained in the casing 20 at a uniform concentration, for example, and the thickness of the side portion of the casing 20 is larger than the thickness of the front portion of the casing 20. In other words, the distance T1 that the light from the LED element 12 passes through the side part is larger than the distance T2 that the light from the LED element 12 passes through the front part. Thereby, even if it is a case where the density | concentration of the light-diffusion particle | grains 22 which the housing | casing 20 contains is made uniform, the crushing feeling of the light in a side part can be suppressed.

  Here, for example, in a cross section perpendicular to the longitudinal direction of the housing 20, the thickness of the housing 20 increases as it approaches the side portion from the front portion. That is, the wall thickness of the housing 20 is gradually increased from the front part to the side part. The above-described feeling of being crushed tends to increase as the distance from the front part approaches the side part. Therefore, by increasing the thickness of the housing 20 as it approaches the side part from the front part, the collapse of light is suppressed while suppressing a decrease in light transmittance at a position between the front part and the side part. Can be suppressed.

  As described above, the straight tube LED lamp 1 according to the present embodiment has a light diffusing function at the side portion that is located on the side of the LED element 12 in the short direction of the housing 20 and perpendicular to the optical axis of the LED element 12. Is larger than the light diffusing function of the front part located on the optical axis of the LED element 12 in the housing, and thus has an effect of suppressing the feeling of light collapse in the side part. Hereinafter, this will be described with reference to FIGS. 3A and 3B.

  FIG. 3A is a side view for explaining a comparative example of the straight tube LED lamp according to the present embodiment, and FIG. 3B is an X for explaining an example of the effect of the housing according to the present embodiment. It is the side view seen from the direction. In any of the straight tube LED lamp 1A according to the comparative example shown in FIG. 3A and the straight tube LED lamp 1 according to the present embodiment shown in FIG. 3B, the LED element 12 is in a light emitting state.

  Compared to the straight tube LED lamp 1 according to the present embodiment, the straight tube LED lamp 1A according to the comparative example illustrated in FIG. 3A is replaced with a housing 20A having substantially the same wall thickness in the circumferential direction. The point to prepare is different. Specifically, the thickness of the side portion is substantially the same as the thickness of the front portion. In such a straight tube LED lamp 1A, as shown in FIG. 3A, the container of the SMD type LED element 12 is shaded, and in the side portion, the feeling of light collapse corresponding to the position where the LED element 12 is arranged. Occurs.

  On the other hand, in the straight tube LED lamp 1 according to the present embodiment, the thickness of the side portion is thicker than that of the straight tube LED lamp 1A according to the comparative example. Light diffusion function is high. Therefore, in the straight tube LED lamp 1 according to the present embodiment, as shown in FIG. 3B, the shadow of the container of the LED element 12 at the side portion becomes thin. Therefore, the feeling of crushed light in the side portion is suppressed.

[Feeding cap]
The base 30 is a power supply base for supplying power to the LED module 10. The base 30 is provided at one end in the longitudinal direction (Y-axis direction) of the housing 20 or the module substrate 11. The base 30 receives power for lighting the LED element 12 from the outside of the straight tube LED lamp 1.

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

  In addition, the adhesive agent used for adhesion | attachment of the nozzle | cap | die 30 and the housing | casing 20 is a silicone resin, for example. For example, the adhesive is made of the same material as the adhesive 50 used for connecting the module substrate 11 and the housing 20. At this time, the other end of the module substrate 11 protruding from the housing 20 and the base 40 may be fixed with an adhesive.

  The base 30 includes a base body 31 and power supply pins 32. For example, the base body 31 is a cylindrical base body and forms an outer shell of the 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 surface. The base body 31 is made of a resin material such as polybutylene terephthalate (PBT). Here, the base 30 is produced by, for example, insert molding using the power supply pin 32 and a resin material. The base 30 can also be produced by press-fitting the power supply pin 32 into the base body 31 that is a resin molded body.

  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. The power supply pin 32 protrudes outward from the outer surface of the bottom surface of the base body 31 and protrudes from the inner bottom surface of the base body 31 toward the opening. A portion of the power supply pin 32 that protrudes from the inner bottom surface of the base body 31 toward the opening is connected to a connection point of the module substrate 11 by a lead wire (not shown).

  Note that the base 30 according to the present embodiment is a GX16t-5 base (L-shaped pin base) in a straight tube LED lamp conforming to JIS C 7709-1, and therefore, the power feed pin 32 is L-shaped.

[Non-powered cap]
The base 40 is a base on the non-power feeding side having a function of attaching the straight tube LED lamp 1 to a lighting fixture. As shown in FIG. 1, the base 40 is provided at the other end of the casing 20 or the module substrate 11 in the longitudinal direction (Y-axis direction). In addition, the nozzle | cap | die 40 may earth | ground the predetermined area | region of the LED module 10 via a lighting fixture.

  The base 40 is configured in a cap shape so as to cover the other end in the longitudinal direction of the housing 20. For example, the base 40 is bonded to the other end of the housing 20 with an adhesive. In the present embodiment, the base 40 is a cylinder having an opening on one side and a bottom surface on the other side.

  The base 40 includes a base body 41 and a non-feed pin 42. For example, the base body 41 is a cylindrical base body and forms an outline of the base 40.

  Specifically, the base body 41 is a cylindrical base body having an opening and a bottom surface. The base body 41 is made of a resin material such as polybutylene terephthalate. Here, the base 40 is produced, for example, by insert molding using the non-feed pin 42 and a resin material. Note that the base 40 can also be manufactured by press-fitting the non-feed pin 42 into the base body 41 which is a resin molded body.

  The non-feed pin 42 is a conductive pin having a T-shaped cross section made of a metal material such as brass, for example. The non-power supply pin 42 is provided so as to protrude outward from the bottom surface 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. The non-feeding pin 42 may be provided so as to penetrate the bottom surface of the base body 41.

  When the base 40 grounds a predetermined area of the LED module 10, the non-feed pin 42 and the module substrate 11 are connected.

[Effects]
As described above, the straight tube LED lamp 1 according to the present embodiment has a light diffusing function for diffusing light from the LED element 12, and is perpendicular to the optical axis of the LED element 12 in the casing 20 and is a casing. The light diffusing function of the side part located on the side of the LED element 12 in the lateral direction of the body 20 is larger than the light diffusing function of the front part of the housing 20 located on the optical axis of the LED element 12.

  Thereby, it is possible to suppress the crushing feeling of light generated when the straight tube LED lamp 1 is viewed from the direction perpendicular to the optical axis of the LED element 12. That is, it is possible to suppress the feeling of light being crushed at the side portion.

  Moreover, in this Embodiment, the housing | casing 20 contains the light-diffusion particle 22, and the quantity of the light-diffusion particle 22 in a side part is larger than the quantity of the light-diffusion particle 22 in a front part.

  Thereby, the light emitted from the LED element 12 to the side part is diffused more than the light emitted from the LED element 12 to the front part. Accordingly, it is possible to suppress the feeling of light being crushed at the side portion.

  Moreover, in this Embodiment, the distance T1 which the light from the LED element 12 permeate | transmits a side part is larger than the distance T2 which the light from the LED element 12 permeate | transmits a front part. Thereby, even if it is a case where the density | concentration of the light-diffusion particle | grains 22 which the housing | casing 20 contains is made uniform, the crushing feeling of the light in a side part can be suppressed.

  Further, in the present embodiment, in the cross section perpendicular to the longitudinal direction of the housing 20, the thickness of the housing 20 increases as it approaches the side portion from the front portion. Therefore, at the position between the front part and the side part, it is possible to suppress the feeling of being crushed while suppressing a decrease in light transmittance.

(Modification 1 of Embodiment 1)
Next, a straight tube LED lamp according to Modification 1 of Embodiment 1 will be described. FIG. 4 is a cross-sectional view of a part of an example of a straight tube LED lamp according to Modification 1 of Embodiment 1 cut along an XZ plane.

  The basic configuration of the straight tube LED lamp 1A in the present modification is the same as the configuration of the straight tube LED lamp in the first embodiment shown in FIG. Therefore, in this modification, it demonstrates centering on a different point from Embodiment 1. FIG.

  As shown in FIG. 4, the housing 220 in this modification example has a translucent member 221 having translucency and a light diffusing particle covering the translucent member 221 compared to the housing 20 in the first embodiment. The difference is that the light diffusing film 222 is included.

  The translucent member 221 is a long cylindrical body having openings at both ends, and is made of, for example, a resin material or glass transparent to visible light. For example, the translucent member 221 is a glass valve (clear valve) made of silica glass. That is, in a state where the light transmissive member 221 is not covered with the light diffusion film 222, the LED module 10 disposed in the light transmissive member 221 can be viewed from the outside of the light transmissive member 221. The translucent member 221 has substantially the same thickness in a cross section perpendicular to the longitudinal direction of the housing 220.

  The light diffusion film 222 covers at least one of the inner surface and the outer surface of the translucent member 221, and is, for example, a resin containing a light diffusion material (fine particles) such as silica or calcium carbonate, or a white pigment. For example, the light diffusion film 222 is formed on the side of the LED element 12 perpendicular to the optical axis of the LED element 12 and in the lateral direction of the housing 220, thicker than the front located on the optical axis of the LED element 12. Yes. That is, the amount of light diffusing particles in the side portion is larger than the amount of light diffusing particles in the front portion.

  Therefore, the straight tube LED lamp according to this modification has the same effects as the straight tube LED lamp 1 according to the first embodiment. That is, it is possible to suppress the feeling of light collapse when the straight tube LED lamp is viewed from the direction perpendicular to the optical axis of the LED element 12. That is, it is possible to suppress the feeling of light being crushed at the side portion.

(Modification 2 of Embodiment 1)
Next, a straight tube LED lamp according to Modification 2 of Embodiment 1 will be described. FIG. 5 is a cross-sectional view of a portion of an example of a straight tube LED lamp according to Modification 2 of Embodiment 1 cut along an XZ plane.

  The basic configuration of the straight tube LED lamp in the present modification is the same as the configuration of the straight tube LED lamp in the first embodiment shown in FIG. Therefore, in this modification, it demonstrates centering on a different point from Embodiment 1. FIG.

  As shown in FIG. 5, the case 320 in this modification has a concentration of the light diffusing particles 22 in the side portion that is the concentration of the light diffusing particles 22 in the front portion as compared to the case 20 in the first embodiment. The difference is that it is higher.

  For example, the casing 320 has substantially the same thickness in the cross section perpendicular to the longitudinal direction of the casing 320, and as described above, the concentration of the light diffusing particles 22 in the side part is the light diffusion in the front part. It is higher than the concentration of the particles 22. That is, the amount of light diffusing particles in the side portion is larger than the amount of light diffusing particles in the front portion.

  Therefore, the straight tube LED lamp according to this modification has the same effects as the straight tube LED lamp 1 according to the first embodiment. That is, it is possible to suppress the feeling of light collapse when the straight tube LED lamp is viewed from the direction perpendicular to the optical axis of the LED element 12. That is, it is possible to suppress the feeling of light being crushed at the side portion.

  Further, since the thickness of the housing 320 can be made substantially the same in a cross section perpendicular to the longitudinal direction of the housing 320, it can be easily molded.

(Modification 3 of Embodiment 1)
Next, a straight tube LED lamp according to Modification 3 of Embodiment 1 will be described. FIG. 6 is a cross-sectional view of a portion of an example of a straight tube LED lamp according to Modification 3 of Embodiment 1 cut along an XZ plane.

  The basic configuration of the straight tube LED lamp in the present modification is the same as the configuration of the straight tube LED lamp in the first embodiment shown in FIG. Therefore, in this modification, it demonstrates centering on a different point from Embodiment 1. FIG.

  As shown in FIG. 6, the case 420 in the present modification is different from the case 20 in the first embodiment in that the case 420 has uneven portions that are repeatedly formed on at least one of the inner surface and the outer surface. That is, the housing 20 in the first embodiment has a light diffusing function by containing the light diffusing particles 22. On the other hand, the housing 420 in this modification has a light diffusing function due to uneven portions repeatedly formed on at least one of the inner surface and the outer surface. Note that in this embodiment, the housing 420 has uneven portions that are repeatedly formed on the outer surface.

  For example, the casing 420 has substantially the same thickness in the cross section perpendicular to the longitudinal direction of the casing 420, and the surface roughness of the uneven portion at the side portion is larger than the surface roughness of the uneven portion at the front portion. It is high. Specifically, for example, the arithmetic average roughness (Ra) of the outer surface of the side portion is larger than the arithmetic average roughness (Ra) of the outer surface of the front portion. Here, the light diffusion function of the housing 420 increases as the surface roughness of the concavo-convex portion increases.

  Therefore, the straight tube LED lamp according to this modification has the same effects as the straight tube LED lamp 1 according to the first embodiment. That is, it is possible to suppress the feeling of light collapse when the straight tube LED lamp is viewed from the direction perpendicular to the optical axis of the LED element 12. That is, it is possible to suppress the feeling of light being crushed at the side portion.

  Moreover, the housing 420 according to this modification has a light diffusing function by having an uneven portion without containing light diffusing particles. Therefore, after forming a cylinder (clear valve) without unevenness, by processing at least one of the outer surface and the inner surface to provide an uneven portion, the housing 420 having a light diffusion function can be manufactured.

(Embodiment 2)
Next, a straight tube LED lamp according to Embodiment 2 will be described. FIG. 7 is a cross-sectional view of a part of an example of a straight tube LED lamp according to Embodiment 2 cut along an XZ plane.

  The basic configuration of the straight tube LED lamp in the present embodiment is the same as the configuration of the straight tube LED lamp in the first embodiment shown in FIG. Therefore, in this embodiment, a description will be given focusing on differences from the first embodiment.

  As shown in FIG. 7, the housing 520 in the present embodiment has a distance L1 from the LED element 12 to the inner surface of the side portion in front of the LED element 12 as compared to the housing 20 in the first embodiment. The point which is larger than the distance L2 to the inner surface of the part is different. That is, in the housing 20 according to the first embodiment, the amount of the light diffusing particles 22 in the side portion is made larger than the amount of the light diffusing particles 22 in the front portion, so that the light diffusing function in the side portion is reduced. Higher than light diffusion function. On the other hand, in the case 520 in the present embodiment, the LED module 10 is arranged such that the distance from the LED element 12 to the inner surface of the side portion is larger than the distance from the LED element 12 to the inner surface of the front portion. Thereby, compared with the case where the straight tube LED lamp in this Embodiment is visually recognized from the front part, the crushing feeling of light when visually recognized from the side part is effectively reduced.

  Here, the housing 520 in the present embodiment is configured such that a base material made of a transparent resin material or glass contains light diffusing particles, similarly to the housing 20 in the first embodiment. .

  For example, the housing 520 is a cylindrical body whose cross section perpendicular to the longitudinal direction of the housing 520 is elliptical, and in the cross section perpendicular to the longitudinal direction of the housing 520, the housing 520 is perpendicular to the optical axis of the LED element 12. The diameter is larger than the diameter in the direction parallel to the optical axis of the LED element 12. That is, the housing 520 has an elliptical cross-sectional shape cut along the XZ plane. Thus, by arranging the LED element 12 so as to coincide with the tube axis of the housing 520, the distance L1 from the LED element 12 to the inner surface of the side portion becomes the distance L2 from the LED element 12 to the inner surface of the front portion. Is bigger than.

  As described above, in the present embodiment, the distance L1 from the LED element 12 to the inner surface of the side portion is larger than the distance L2 from the LED element 12 to the inner surface of the front portion. Thereby, the straight tube LED lamp according to the present embodiment has the same effect as the straight tube LED lamp 1 according to the first embodiment. That is, it is possible to suppress the feeling of light collapse when the straight tube LED lamp is viewed from the direction perpendicular to the optical axis of the LED element 12. That is, it is possible to suppress the feeling of light being crushed at the side portion.

  Note that the cross-sectional shape perpendicular to the longitudinal direction of the housing 520 may not be elliptical, and may be, for example, substantially circular. For example, the casing 520 is formed to be thicker, and the distance from the surface of the substrate 11 on which the LED element 12 is disposed to the tube axis of the housing 520 is greater than the distance from the surface opposite to the surface to the tube axis. However, by disposing the LED module 10 so as to be further away from the light, it is possible to suppress the feeling of light collapse at the side portion while suppressing a decrease in light transmittance at the front portion.

(Embodiment 3)
An illumination device according to Embodiment 3 of the present invention is an illumination device including the above-described illumination light source. For example, the illumination device according to the third embodiment includes the straight tube LED lamp 1 according to the first embodiment.

  FIG. 8 is an overview perspective view showing an example of the illumination device 9 according to Embodiment 3 of the present invention. As shown in FIG. 8, the lighting device 9 according to Embodiment 3 is a base light, and includes a straight tube LED lamp 1 and a lighting fixture 900.

  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 9. In addition, the illuminating device 9 which concerns on this Embodiment is provided with the two straight tube | pipe LED lamps 1 as an example.

  The lighting fixture 900 includes a pair of metal receivers 910 that are electrically connected to the straight tube LED lamp 1 and hold the straight tube LED lamp 1, and a device main body 920 to which the metal receiver 910 is attached.

  The instrument main body 920 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 900 is mounted on a ceiling or the like via a fixture, for example. The lighting fixture 900 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, the lighting device 9 according to the present embodiment has the same effects as those of the first and second embodiments and the modifications thereof. That is, it is possible to suppress the feeling of light collapse when the straight tube LED lamp is viewed from the direction perpendicular to the optical axis of the LED element 12. That is, it is possible to suppress the feeling of light being crushed at the side portion.

(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 embodiment, the case where the LED module is an SMD type LED module using a packaged LED element has been described. However, the present invention is not limited to this. 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.

  Two or more substrates (LED modules) arranged in the housing may be arranged. 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 may not be an integral housing, and may be a housing that can be divided into a plurality of parts, such as a translucent cover and a housing.

  Moreover, in the said embodiment, the nozzle | cap | die main body demonstrated the outer diameter as a substantially uniform cylinder. In other words, the base body has been described as a cylinder having a substantially uniform cross-sectional shape parallel to the opening surface or the bottom surface. However, the base body only needs to be cylindrical, and for example, a configuration including a wide region and a narrow region, that is, a configuration having a step on the side surface of the base body. Alternatively, the base body may be a square tube having a substantially uniform cross-sectional shape parallel to the opening surface or the bottom surface.

  The base body may not have a bottom surface. 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.

  Moreover, although the case where a housing | casing and a nozzle | cap | die were cylinders was demonstrated, a housing | casing and a nozzle | cap | die may not be a cylinder. For example, the casing and the base may be square tubes.

  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 an L-shaped base 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.

  Further, the housing may have a light diffusion function by a dot pattern printed on the inner surface or the outer surface of the housing.

  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, it is realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, and forms obtained by making various modifications conceived by those skilled in the art to each embodiment. Forms are also included in the present invention.

1, 1A Straight tube LED lamp (light source for illumination)
9 Lighting Device 10 LED Module 11 Module Board (Board)
12 LED elements (light emitting elements)
20, 20A, 220, 320, 420, 520 Case 21 Base material 22 Light diffusion particle 30, 40 Base 50 Adhesive 31, 41 Base body 32 Power supply pin 42 Non-power supply pin 221 Translucent member 222 Light diffusion film 900 Lighting fixture 910 Receipt 920 Instrument body

Claims (12)

A long casing;
An elongated substrate disposed in the housing and having a plurality of light emitting elements disposed thereon;
The housing has a light diffusion function of diffusing light from the light emitting element,
The light diffusing function of a side portion of the casing that is located on a side of the light emitting element perpendicular to the optical axis of the light emitting element and in a lateral direction of the casing is the light emitting function of the casing. larger than the light diffusion function of the forward portion positioned in the optical axis of the element rather,
The wall thickness of the casing is an illumination light source that gradually changes over the entire circumference of a cross section having the longitudinal direction of the casing as a normal line . The housing contains light diffusing particles,
The light source for illumination according to claim 1, wherein an amount of the light diffusing particles in the side portion is larger than an amount of the light diffusing particles in the front portion. The light source for illumination according to claim 2, wherein a distance that the light from the light emitting element passes through the side part is larger than a distance that the light from the light emitting element passes through the front part. 4. The illumination light source according to claim 3, wherein a thickness of the casing increases in a cross section perpendicular to a longitudinal direction of the casing from the front portion toward the side portion. The light source for illumination according to any one of claims 2 to 4, wherein a concentration of the light diffusing particles in the side portion is higher than a concentration of the light diffusing particles in the front portion. The illumination light source according to any one of claims 2 to 5, wherein the casing includes a translucent member having translucency and a light diffusion film that covers the translucent member and contains the light diffusing particles. . The distance for the said housing | casing from the said light emitting element to the inner surface of the said side part is larger than the distance from the said light emitting element to the inner surface of the said front part. light source. The case is a cylindrical body whose cross section perpendicular to the longitudinal direction of the case is elliptical,
The illumination light source according to claim 7, wherein a diameter in a direction perpendicular to the optical axis of the light emitting element is larger than a diameter in a direction parallel to the optical axis of the light emitting element in a cross section perpendicular to the longitudinal direction of the housing. The light source for illumination according to any one of claims 1 to 8, wherein the housing has a concavo-convex portion that is repeatedly formed on at least one of an inner surface and an outer surface. The light source for illumination according to claim 9, wherein a surface roughness of the uneven portion in the side portion is higher than a surface roughness of the uneven portion in the front portion.   The casing is a straight tubular outer tube having a light diffusion function over the entire circumference of a cross section having the longitudinal direction of the casing as a normal line.
  The light source for illumination according to any one of claims 1 to 10. An illumination device comprising the illumination light source according to any one of claims 1 to 11 .

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