JP6083781B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  As an illumination device, halogen bulbs are widely used. In recent years, in the lighting field, in order to save power and extend the life of a bulb, it has been studied to use a power saving type bulb such as an LED lamp instead of a halogen bulb. Since the halogen bulb uses glass as the material of the reflex, the reflex portion also emits light due to the light transmitted through the reflective film. However, a light bulb-type LED lamp for substituting a halogen light bulb does not transmit light because a metal heat sink is used in the portion corresponding to the reflex of the halogen light bulb. Therefore, in the light bulb-type LED lamp, light emission is only from the front surface, and light emission from the side surface cannot be obtained unlike a halogen light bulb. In view of this, studies have been made to provide a window portion for emitting light leaking from the lens side surface to the outside on the side wall portion of the radiator (heat sink), and to provide a light guide member for guiding the light to the window portion on the lens side surface. (For example, refer to Patent Document 1). In addition, an LED bulb including a housing having a slit that communicates the inside and the outside in a direction other than the front has been studied (see, for example, Patent Document 2).

JP 2011-228264 A JP 2011-14505 A

  However, in the LED lamp having the configuration of Patent Document 1, light that would normally go upward (light emission direction) in the lens is guided in the window (hole) direction of the side surface. There is a concern that efficiency will be inferior. Moreover, in the LED lamp of the structure of each said patent document, it was necessary to provide a hole and a slit in a heat sink and a housing | casing.

  Therefore, an object of the present invention is to provide an illumination device for replacing a halogen light bulb that emits light from the side surface of the lamp as well as the halogen light bulb without reducing the light emission efficiency.

In order to achieve the above object, a lighting device of the present invention includes a light emitting element, a heat radiator, a lens, and a light guide.
The radiator is a bottomed cylindrical shape,
The light emitting element is disposed at the bottom of the radiator,
The lens is disposed in the opening of the radiator,
The light guide is arranged on the outer periphery of the radiator, and is arranged so that one end of the light guide on the opening side is in contact with a peripheral portion of the lens.

  According to the present invention, it is possible to effectively use the light beam that has been lost without being emitted from the lens, so that light is emitted from the side of the lamp in the same manner as the halogen bulb without lowering the light emission efficiency. An illumination device for substituting a halogen bulb can be provided.

FIG. 1 is a diagram showing a configuration of an example (embodiment 1) of a halogen bulb replacement bulb-type LED lamp, which is an example of the illumination device of the present invention. 1 (a) is a perspective view, FIG. 1 (b) is a cross-sectional view seen in the II direction of FIG. 1 (a), and FIG. 1 (c) is seen in the II-II direction of FIG. 1 (a). It is sectional drawing. FIG. 2 is a diagram illustrating a configuration of a radiator in the halogen bulb replacement bulb-type LED lamp of the first embodiment. 2 (a) is a side view, FIG. 2 (b) is a top view, FIG. 2 (c) is a cross-sectional view as viewed in the III-III direction of FIG. 2 (b), and FIG. 2 (d) is FIG. It is sectional drawing seen in the IV-IV direction. FIG. 3 is a diagram illustrating the configuration of the lens and the light guide in the halogen bulb replacement bulb-type LED lamp of the first embodiment. 3 (a) is a side view, FIG. 3 (b) is a top view, and FIG. 3 (c) is a cross-sectional view seen in the VV direction of FIG. 3 (b). FIG. 4 is a diagram showing a configuration of another example (Embodiment 2) of a bulb-type LED lamp for substituting a halogen bulb, which is an example of the illumination device of the present invention. 4A is a side view showing the configuration of the radiator, FIG. 4B is a top view thereof, FIG. 4C is a perspective view showing the configuration of the bulb-type LED lamp, and FIG. It is sectional drawing seen in the VI-VI direction of 4 (c). FIG. 5 is a diagram showing a configuration of still another example (embodiment 3) of a bulb-type LED lamp for substituting a halogen bulb, which is an example of the illumination device of the present invention. FIG. 5A is a perspective view showing the configuration of the radiator, FIG. 5B is a perspective view showing the configuration of the lens and the light guide, and FIG. 5C is a perspective view showing the configuration of the bulb-type LED lamp. FIG. 5D is a cross-sectional view seen in the VII-VII direction of FIG.

  In the illuminating device of the present invention, it is preferable that a plurality of the light guides are arranged at a predetermined interval in the circumferential direction of the radiator.

  In the illuminating device of the present invention, it is preferable that the radiator has a groove in the outer wall in which the light guide can be fitted.

  Moreover, the illuminating device of this invention WHEREIN: The cylindrical member which can be fitted to the outer periphery of the said heat radiator may be sufficient as the said light guide, for example.

  In the illumination device of the present invention, it is preferable that the light guide is formed integrally with the lens.

  In the illumination device of the present invention, the radiator may have a slit in a part of a region where the light guide is disposed, for example.

  In the illumination device of the present invention, it is preferable that the light emitting element is an LED element, and the illumination device is a light bulb type LED lamp.

  Hereinafter, the illumination device of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, in the following FIGS. 1-5, the same code | symbol is attached | subjected to the same part and the description may be abbreviate | omitted. In the drawings, for convenience of explanation, the structure of each part may be simplified as appropriate, and the dimensional ratio of each part may be schematically shown, unlike the actual case.

[Embodiment 1]
The illumination device of the present embodiment is an example of a light bulb type LED lamp for substituting for a halogen light bulb. In FIG. 1, the structure of the light bulb type LED lamp for the halogen light bulb substitution of this embodiment is shown. FIG. 1A is a perspective view showing the configuration of the bulb-type LED lamp, FIG. 1B is a cross-sectional view of the bulb-type LED lamp shown in FIG. 1 (c) is a cross-sectional view taken along the II-II direction. In FIG. 2, the structure of the heat radiator in the said light bulb type LED lamp is shown. 2A is a side view showing the configuration of the radiator, FIG. 2B is a top view thereof, and FIG. 2C is a III-III direction of the radiator shown in FIG. 2B. FIG. 2D is a cross-sectional view seen in the IV-IV direction. FIG. 3 shows the configuration of the lens and the light guide in the light bulb type LED lamp. 3A is a side view showing the configuration of the lens and the light guide, FIG. 3B is a top view thereof, and FIG. 3C is the lens shown in FIG. It is sectional drawing seen in the VV direction of the light guide.

  As shown in FIGS. 1 to 3, the light bulb-type LED lamp 10 of the present embodiment includes an LED element 11, a radiator 12, a lens 13, and a light guide 14 as main components. The radiator 12 has a bottomed cylindrical shape having a bottom 121 and a side wall 122, and has an upper opening (opening 123). The radiator 12 of the present embodiment has a bowl-like shape in which the outer diameter expands toward the opening 123 at first and gradually becomes constant. On the outer wall of the side wall 122 of the radiator 12, a plurality of grooves 124 are provided in the circumferential direction at equal intervals in the vertical direction of the radiator 12 (the direction from the opening 123 side toward the bottom 121). A plurality of light guides 14 are arranged on the peripheral portion 132 of the light emitting surface 131 of the lens 13 at equal intervals in the circumferential direction so that one end on the opening 123 side is in contact with the peripheral portion 132 of the lens 13. 13 and the light guide 14 are optically connected. The light guide 14 is a protruding member that protrudes in a direction perpendicular to the surface direction of the light emitting surface 131. The light guide body 14 is inclined in the protrusion direction of the projection toward the center of the light exit surface 131 of the lens 13 and is substantially the same as the inclination of the side wall 122 of the radiator 12. The LED element 11 is disposed on the bottom 121 in the radiator 12. The lens 13 is disposed so that its light exit surface 131 is positioned in the opening 123 of the radiator 12 and covers the LED element 11. The light guide 14 is disposed so as to surround the side wall portion 122 of the radiator 12, and is disposed outside the radiator 12 in a state of being fitted in the groove portion 124 of the radiator 12. The height of the surface of the side wall portion 122 excluding the groove portion 124 in the radiator 12 is substantially the same as the height of the outer surface of the light guide body 14.

  The LED element 11 is not particularly limited, and for example, a known LED element can be used. The LED element 11 is mounted on a wiring pattern formed on a substrate (not shown) having excellent thermal conductivity, for example, at the bottom 121 of the radiator 12. In the light bulb type LED lamp of the present embodiment, the LED element may be included in, for example, a silicone resin, and yellow phosphor particles are dispersed in the silicone resin so that the LED element is a blue light emitting diode. For example, white light is obtained. White light can also be obtained by a combination of a blue LED and a red / green phosphor, or a combination of a near-ultraviolet LED and a red / green / blue phosphor.

  The radiator 12 is made of a non-translucent heat dissipation material. Examples of the heat dissipation material include metal materials, ceramic materials, resin materials, carbon-based materials such as graphite, and combinations of these materials. Examples of the metal material include aluminum, magnesium, copper, and the like. Examples of the ceramic material include alumina, zirconia, silicon carbide, and the like. Examples of the resin material include polycarbonate, nylon, and PPS. The radiator 12 may have, for example, a multilayer structure formed from the above-described heat dissipation material. In general, the above-described resin material has a lower thermal conductivity than the above-described metal material or ceramic material. However, for example, if the amount of heat generated by the LED element 11 is relatively small, it can be sufficiently used as a heat dissipation material. . Among the resin materials described above, a highly heat conductive resin is more preferable. Examples of the high thermal conductive resin include a resin mixed with a filler having high thermal conductivity. The radiator 12 has, for example, an inner peripheral surface that is a light reflecting surface, and may also be used as a reflecting mirror. The size of the radiator 12 is not particularly limited, and is, for example, the same as or smaller than that of an existing halogen lamp with a reflector. Specifically, in the case of replacing a halogen light bulb with an opening diameter of the reflector of about 50 [mm] to 70 [mm], for example, the opening diameter of the radiator 12 is about 50 [mm] to about 70 [mm]. Or smaller than that. In the light bulb-type LED bulb 10, a case in which a lighting circuit or the like is accommodated is fixed to the outside of the bottom 121 of the radiator 12, but the present invention is not limited to this example.

  The lens 13 is formed from a translucent material. Examples of the translucent material include a resin material, glass, and ceramics. Examples of the resin material include polycarbonate and acrylic. The method for forming the lens 13 is not particularly limited, and for example, a known method can be applied using the above-described forming material.

  The light guide 14 is made of a light transmissive material. Examples of the translucent material are the same as those described for the lens 13. The lens 13 and the light guide 14 are preferably formed integrally, and more preferably, the lens 13 and the light guide 14 are preferably formed integrally from the same forming material. The forming material in this case is particularly preferably polycarbonate, acrylic, polycycloolefin, or the like.

  The bulb-type LED lamp 10 can emit light from the side of the lamp as well as the halogen bulb without reducing the light emission efficiency. Such an effect is obtained as follows. That is, in the light bulb type LED lamp 10, the light emitted from the LED element 11 is collected by the lens 13 and emitted from the light exit surface 131 of the lens 13 to the outside of the light bulb type LED lamp 10. Here, some of the light incident on the lens 13 is not emitted to the outside of the light bulb type LED lamp 10 due to total reflection or the like, for example, and a conventional light bulb type LED lamp (for example, Japanese Patent Application Laid-Open No. 2011-228264). In the light bulb type LED lamps described in Japanese Unexamined Patent Publication No. 2011-14505 and the like, this light cannot be used. In the light bulb-type LED lamp 10 according to the present invention, the light guide 14 is disposed on the peripheral edge 132 of the lens 13 as described above. For this reason, light that is not emitted from the lens 13 to the outside enters the light guide 14 from the peripheral edge 132 of the lens 13 and is guided through the light guide 14. As described above, the light that is not emitted to the outside from the lens 13 is guided into the light guide 14, so that the light bulb type LED lamp 10 does not transmit light without providing a window or the like in the radiator. Light can also be emitted from the side surface of the light radiator 12 in the same manner as the halogen bulb. The light used for light emission from the side surface is light that has been lost without being emitted from the lens. Since such light is effectively used, the light emission efficiency is not lowered.

  Further, in the light bulb type LED lamp 10, as described above, the groove portion 124 of the radiator 12 is provided in the vertical direction of the radiator 12 (the direction from the opening 123 side toward the bottom 121). For this reason, when the lens 13 and the light guide 14 are attached to the radiator 12 during the manufacture of the bulb-type LED lamp 10, the groove 124 is, for example, a guide rail for arranging the light guide 14 at an appropriate position. Serves as a function. For this reason, if it is such a structure, improvement of manufacturing efficiency, automation of manufacture, etc. are possible, for example.

  In the bulb-type LED lamp 10, as described above, the height of the surface of the side wall 122 excluding the groove 124 in the radiator 12 and the height of the outer surface of the light guide 14 are substantially the same. For this reason, in the light guide 14, there is no part which protruded from the side wall part 122 of the heat radiator 12, for example, damage to the light guide 14 does not occur easily. In addition, this invention is not limited to this example, For example, the surface of the said light guide may protrude from the groove part of the said heat radiator, and the groove part is not provided in the said heat radiator, but the said heat dissipation The light guide may be provided on the outer wall surface of the vessel.

  In the light bulb type LED lamp 10, the light guides 14 are provided at equal intervals in a direction perpendicular to the surface direction of the light exit surface 131 of the lens 13, but the present invention is limited to this example. Not. The light guide can be appropriately designed in shape according to a desired light extraction position, for example, may be provided obliquely or curved from the opening side of the radiator to the bottom side, It may be provided in a mesh (lattice) shape or may not be provided at equal intervals. Moreover, in this embodiment, although the light guide 14 is provided over the up-down direction full length of the heat radiator 12, this invention is not limited to this example, For example, to the middle of the up-down direction of the heat radiator 12 It may be provided. Depending on the design of the light guide, for example, light can be extracted behind the lamp. In this invention, it is preferable to arrange | position the groove part of the said heat radiator with the same pattern according to the shape of the above-mentioned light guide.

[Embodiment 2]
The illumination device of the present embodiment is an example of a light bulb type LED lamp for substituting for a halogen light bulb. FIG. 4 shows the configuration of a bulb-type LED lamp for replacing the halogen bulb according to the present embodiment. 4A is a side view showing the structure of a heat radiator in the light bulb type LED lamp, FIG. 4B is a top view thereof, and FIG. 4C is a perspective view showing the structure of the light bulb type LED lamp. 4D is a cross-sectional view of the bulb-type LED lamp shown in FIG. 4C as viewed in the VI-VI direction.

  As shown in FIG. 4, the bulb-type LED lamp 20 of the present embodiment has the same configuration as the bulb-type LED lamp 10 shown in FIGS. 1 to 3 except that it includes a radiator 22 instead of the radiator 12. Have.

  The radiator 22 has the same configuration as the radiator 12 except that a slit 224 is provided instead of the groove portion 124 in the radiator 12. Specifically, a plurality of slits 224 are provided in the sidewall 122 of the radiator 22 at equal intervals in the circumferential direction in the vertical direction of the radiator 22 (the direction from the opening 123 side toward the bottom 121). . Even in such a configuration, the effects of the present invention described above can be obtained in the same manner as the light bulb type LED lamp 10 shown in FIGS.

  In the light bulb type LED lamp 20, the slit 224 of the heat radiator 22 functions as a guide rail when the light bulb type LED lamp 20 is manufactured, for example, similarly to the groove portion of the heat radiator in the first embodiment. For this reason, it is preferable that the width of the slit 224 is narrow as long as it functions as a guide rail. Specifically, the width of the slit 224 is preferably in the range of 0.5 to 10 mm, and more preferably in the range of 0.5 to 5 mm.

  In the light bulb-type LED lamp 20, the light guide 14 is disposed outside the radiator 22 in a state of being disposed in the slit 224 of the radiator 22, but the present invention is not limited to this example. For example, if the light guide has a T-shaped cross section, for example, the slit of the radiator can function as a guide rail during manufacturing, and further, the light guide can be wider than the slit width. Therefore, for example, adjustment such as increasing the light emission amount on the side surface of the radiator can be performed.

  In the light bulb type LED lamp 20, the slit 224 of the radiator 22 is provided over the entire vertical length of the radiator 22, but the present invention is not limited to this example. For example, the slit of the radiator is It may be up to the middle of the radiator. Moreover, the slit and the groove portion may be provided in combination on the side wall portion of the radiator, for example, in the vertical direction of the radiator. Specifically, for example, a slit may be provided from the upper side to the middle of the radiator, and a groove portion may be provided from the middle to the lower side.

[Embodiment 3]
The illumination device of the present embodiment is an example of a light bulb type LED lamp for substituting for a halogen light bulb. In FIG. 5, the structure of the light bulb type LED lamp for the halogen light bulb substitute of this embodiment is shown. FIG. 5A is a perspective view showing a configuration of a heat radiator in the bulb-type LED lamp, FIG. 5B is a perspective view showing a configuration of a lens and a light guide in the bulb-type LED lamp, and FIG. c) is a perspective view showing the configuration of the bulb-type LED lamp, and FIG. 5D is a cross-sectional view of the bulb-type LED lamp shown in FIG. 5C as viewed in the VII-VII direction.

  As shown in FIG. 5, the bulb-type LED lamp 30 of the present embodiment includes the LED element 11, a radiator 32, a lens 13, and a light guide 34 as main components. The radiator 32 has a bottomed cylindrical shape having a bottom 321 and a side wall 322, and has an upper opening (opening 323). The radiator 32 according to the present embodiment has a shape in which the outer diameter is enlarged partway toward the opening 323 and is constant thereafter. A light guide 34 is disposed on the periphery of the light exit surface 131 of the lens 13. The light guide 34 is a cylindrical member that can be fitted to the outer periphery of the radiator 32. The inner diameter of the cylindrical light guide 34 and the outer diameter of the side wall 322 of the cylindrical radiator 32 are substantially the same. The LED element 11 is disposed on the bottom 321 in the radiator 32. The lens 13 has a light exit surface 131 located at the opening 323 of the radiator 32 and is disposed so as to cover the LED element 11. The light guide 34 is coaxially disposed so as to surround the outside of the side wall portion 322 of the radiator 32. Even in such a configuration, the effects of the present invention described above can be obtained in the same manner as the light bulb type LED lamp 10 shown in FIGS. Further, since the light guide 34 is provided on the entire outside of the side wall portion 322 of the radiator 32, light can be emitted from the entire side wall portion 322 of the radiator 32, for example.

  In the first to third embodiments, the present invention has been described by taking a light bulb-type LED lamp as an alternative to a halogen light bulb, in which the light-emitting element is an LED element. In the present invention, the light-emitting element is only the LED element. It is not limited to. The light emitting element only needs to be a light emitting element that requires heat dissipation by the radiator, and examples thereof include organic EL and inorganic EL.

  According to the present invention, it is possible to provide an illuminating device for replacing a halogen light bulb that emits light from the side surface of the lamp as well as the halogen light bulb without lowering the light emission efficiency. In addition, for example, the light extraction position can be easily designed such that light can be extracted behind the lamp according to the design of the light guide, and the lighting device of the present invention can be used in a wide range of applications. .

10, 20, 30 Light bulb type LED lamp (lighting device)
11 LED element (light emitting element)
12, 22, 32 Radiator 13 Lens 14, 34 Light guide 121 Bottom 122 of radiator 12 Side wall 123 of radiator 12 Opening 124 of radiator 12 Groove 131 of radiator 12 Light exit surface 132 of lens 13 Lens 13 peripheral edge 224 radiator 32 slit 321 radiator 32 bottom 322 radiator 32 side wall 323 radiator 32 opening

Claims (4)

Including a light emitting element, a radiator, a lens, and a light guide;
The radiator is cylindrical with a bottom, does not have a hole,
The light emitting element is disposed at the bottom of the radiator,
The lens is disposed in the opening of the radiator,
The light guide is arranged on the outer periphery of the radiator and has a predetermined interval in the circumferential direction of the radiator so that one end of the light guide on the opening side is in contact with a peripheral portion of the lens. And a plurality of the lighting devices. The radiator, the outer wall, the light guide has a fittable groove, lighting apparatus according to claim 1. The light guide is formed in the lens integrally with the lighting device according to either of claims 1 and 2. The light emitting element is an LED element;
The lighting device according to any one of claims 1 to 3 , wherein the lighting device is a light bulb type LED lamp.

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