EP3141794A1 - Dispositif d'eclairage a del - Google Patents

Dispositif d'eclairage a del Download PDF

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Publication number
EP3141794A1
EP3141794A1 EP16187443.3A EP16187443A EP3141794A1 EP 3141794 A1 EP3141794 A1 EP 3141794A1 EP 16187443 A EP16187443 A EP 16187443A EP 3141794 A1 EP3141794 A1 EP 3141794A1
Authority
EP
European Patent Office
Prior art keywords
optical element
light
lighting device
guiding rod
incidence surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16187443.3A
Other languages
German (de)
English (en)
Inventor
Hiromichi Hayashihara
Hiroshi Ohno
Tomoyuki Suzuki
Tomonao Takamatsu
Takeshi Morino
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Publication of EP3141794A1 publication Critical patent/EP3141794A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/101—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening permanently, e.g. welding, gluing or riveting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/12—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by screwing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • Embodiments described herein relate generally to LED lighting devices.
  • An LED lighting device for general lighting is sometimes expected to have a shape like an incandescent bulb and emits light like an incandescent bulb. That is, retrofitting is sometimes desired.
  • a clear incandescent bulb such as an incandescent bulb having a globe formed with clear glass.
  • the light distribution angle becomes narrower, and the 1/2 light distribution angle decreases to approximately 120 degrees. In view of this, the light distribution angle may be widened with an optical element, such as a wide distribution lens.
  • This optical element has a scattering member at the edge of a light guiding rod.
  • An LED is provided on the bottom surface facing the scattering member. Light emitted from the LED propagates in the light guiding rod through total reflection, and is guided to the scattering member. The light that has reached the scattering member is scattered by the scattering member, and is emitted to the outside. In this manner, an LED bulb that distributes light uniformly from the center of the bulb like a filament bulb can be achieved.
  • the LED bulb is made to look unattractive by light leaking from the root portion of the light guiding rod.
  • this leakage light originates from light that does not satisfy the total reflection conditions in the light guiding rod or light that propagates without entering the light guiding rod.
  • Such leakage light makes the bulb look unattractive, and is preferably not to be seen.
  • An LED lighting device includes: a light source including an LED; an optical element including an incidence surface, a side surface perpendicular to the incidence surface, and an exit surface facing the incidence surface, the optical element being configured to receive light emitted from the light source with the incidence surface, transmit the light inside the optical element, and release the light from the exit surface; a covering portion disposed on a side portion of the optical element, the side portion being located on a side of the incidence surface, the covering portion covering the side portion; and a light absorbing portion disposed on the covering portion, the light absorbing portion facing the side surface of the optical element.
  • Fig. 1 is an exploded perspective view of an LED lighting device 1 of the first embodiment.
  • Fig. 2 is a cross-sectional view of the LED lighting device 1 of the first embodiment.
  • the LED lighting device 1 of the first embodiment includes a globe 100, a cover (a covering portion) 102, a light guiding rod (an optical element) 104, spacer fixing screws 106 and 107, a spacer 108, an LED 110, a housing 112, cover fixing screws 114 and 115, and a cap 116. That is, the LED lighting device 1 of the first embodiment is an LED bulb.
  • the LED 110 is located between a recess of the housing 112 serving as the base and the spacer 108.
  • the spacer 108 is attached to the recess of the housing 112 with the spacer fixing screws 106 and 107, so that a portion of the LED 110 is pressed against and fixed to the surface of the recess of the housing 112 by the spacer 108.
  • the opposite side of the housing 112 from the side having the LED 110 fixed thereto is a cylindrical portion, and this cylindrical portion is covered with the cap 116.
  • a through hole into which the light guiding rod 104 is to be inserted is formed in the central portion of the spacer 108.
  • the light guiding rod 104 is formed with a transparent medium having a refractive index n (n > 1), or more specifically, with a material such as polymethylmethacrylate (PMMA), polycarbonate (PC), or silica glass.
  • the light guiding rod 104 is a cylindrical structure that has an incidence surface 200 facing the LED 110, and a side surface 202 substantially perpendicular to the incidence surface 200.
  • the incidence surface 200 and the side surface 202 of the light guiding rod 104 are mirror-finished.
  • the light guiding rod 104 has a recess 204 at its edge, and a scattering member 206 formed with a white coating, for example, is provided in the recess 204.
  • the light guiding rod 104 is bonded to the spacer 108 with an adhesive.
  • the LED 110 and the light guiding rod 104 are at a distance from each other, with the spacer 108 existing in between.
  • the cover 102 is provided at the side portion of the light guiding rod 104 on the side of the incidence surface 200, and this cover 102 is fixed to the housing 112 with the cover fixing screws 114 and 115.
  • a light absorbing portion 302 is formed on the surface of the cover 102 facing the light guiding rod 104. This light absorbing portion 302 will be described later in detail.
  • An air layer 130 exists between the light absorbing portion 302 and the side surface 202 of the light guiding rod 104.
  • the light guiding rod 104 and the cover 102 is covered with the globe 100, and are contained in the globe 100.
  • the globe 100 is bonded and fixed to the housing 112 with an adhesive, for example.
  • the LED 110 is supplied with electric power from a power supply and an electric cable, and emits light. Light from the LED 110 is refracted by the incidence surface 200 of the light guiding rod 104, and enters the light guiding rod 104.
  • a gap or the air layer 130 exists between the light guiding rod 104 and the light absorbing portion 302 formed on the surface of the cover 102 facing the light guiding rod 104. Because of this, the light that has entered the light guiding rod 104 propagates while totally-reflected repeatedly by the side surface 202 substantially perpendicular to the incidence surface 200. The light that has propagated while totally-reflected repeatedly by the side surface 202 is scattered by the scattering member 206 formed in the recess 204 at the edge of the light guiding rod 104, and is omnidirectionally emitted.
  • the light absorbing portion 302 absorbs the light emitted from the portions other than the scattering member 206 formed at the edge of the light guiding rod 104.
  • the light guiding rod 104 includes a flat surface formed with the incidence surface 200, the side surface 202 substantially perpendicular to the incidence surface 200, and a corner portion 300 forming the boundary between the incidence surface 200 and the side surface 202.
  • “being substantially perpendicular” implies that there are cases where the side surface 202 is tapered so as to facilitate the pullout in the injection molding process, or gather light at the edge of the light guiding rod 104, for example. That is, the side surface 202 might need to be not perpendicular to the light guiding rod 104 so that the light guiding rod 104 can be appropriately manufactured.
  • the incidence surface 200 and the side surface 202 of the light guiding rod 104 are mirror-finished, to minimize the unevenness on the surfaces. This mirror finish is performed through buff finish, for example.
  • the recess 204 having the scattering member 206 formed with a white coating is formed at the edge of the light guiding rod 104.
  • the recess 204 may be in any other form, as long as it can achieve the same effect.
  • the scattering member 206 may be formed by attaching fine hollow beads to the recess 204, performing blast processing on the recess 204, or filling the recess 204 with a resin formed with a scattering material.
  • the recess 204 may have a spheroidal shape. Alternatively, the recess 204 may have some other shape, such as a conical shape or a cylindrical shape.
  • the air layer 130 exists between the light guiding rod 104 and the light absorbing portion 302.
  • the light guiding rod 104 and the spacer 108 are fixed to each other with an adhesive, but may be fixed to each other by engaging with each other or by some other method.
  • the inner diameter of the cover 102 is also tapered on the edge side, so that the light guiding rod 104 will not fall off the cover 102.
  • the corner portion 300 of the light guiding rod 104 does not have exactly a right angle, but is formed with a curved surface or flat faces. This corner portion 300 may not be mirror-finished but is a scattering surface. As shown in Fig. 3A , when light reflected or scattered by the corner portion 300 enters a side surface 203 on the opposite side of the central axis 210 of the light guiding rod 104, some of the light does not satisfy the total reflection conditions depending on the incident angle, and exits as it is. Also, some of the light is reflected or scattered by the surface of the cover 102 facing the light guiding rod 104, and exits through the light guiding rod 104. For the above reasons, leakage light is generated.
  • the light absorbing portion 302 absorbs such leakage light in the LED lighting device 1 of the first embodiment. Referring now to Figs. 3A through 5B , this aspect will is described in detail.
  • Figs. 4A and 4B are photographs of light leaking from the light guiding rod 104.
  • Fig. 4A is a photograph showing the light guiding rod 104 when the lighting device is off.
  • Fig. 4B is a photograph showing the light guiding rod 104 when the lighting device is on.
  • a blight line indicated by an arrow is observed when the lighting device is on. This indicates leakage light that has been reflected or scattered by the corner portion 300 of the light guiding rod 104.
  • Fig. 5A is a photograph showing the light guiding rod 104 when the lighting device is off.
  • Fig. 5B is a photograph showing the light guiding rod 104 when the lighting device is on.
  • the light absorbing portion 302 is formed with a material that absorbs light, such as a matte-black coating, black alumite, a black plating, black paper, a black sheet, black alumina, black silicon, or black plastic.
  • the condition for total reflection of light on a surface of the light guiding rod 104 is expressed as ⁇ > sin ⁇ 1 1 / n .
  • ⁇ represents the incident angle of light that has been reflected or scattered by the corner portion 300 of the light guiding rod 104 and entered the side surface 203 facing the corner portion 300 as shown in Fig. 3B
  • n represents the refractive index of the medium of the light guiding rod 104.
  • the diameter D of the light guiding rod 104 is 13 mm, and the refractive index n of the light guiding rod 104 is 1.49. Therefore, the length L of the light absorbing portion 302 should be at least 11.77 mm. Where the length L of the light absorbing portion 302 was 12 mm, no leakage light was observed.
  • Fig. 6 shows the relevant components of the LED lighting device 1 of the first embodiment.
  • the edge of the light guiding rod 104 and the like are not shown.
  • the light absorbing portion 302 formed with a matte-black coating or the like is provided on the surface of the cover 102 facing the light guiding rod 104.
  • the length L of the light absorbing portion 302 is expressed as L > D / ⁇ n 2 ⁇ 1 , where D represents the diameter of the light guiding rod 104, and n represents the refractive index of the light guiding rod 104.
  • Fig. 7 shows a photograph of the LED lighting device equipped with the cover 102 having the light absorbing portion 302 when the LED lighting device is on. As can be seen from Fig. 7 , no leakage light is observed in the LED lighting device 1 of the first embodiment.
  • Fig. 8 shows a photograph of an LED bulb of a comparative example when the LED bulb is on.
  • the LED bulb of this comparative example has the same structure as the LED lighting device of the first embodiment, except for not including the light absorbing portion 302. As can be seen from Fig. 8 , leakage light is observed in this comparative example, as opposed to the first embodiment.
  • the first embodiment can provide an LED lighting device capable of preventing leakage light.
  • FIG. 9 is a cross-sectional view of the relevant components of the LED lighting device of the second embodiment.
  • the LED lighting device 1 of the second embodiment has the same structure as the LED lighting device of the first embodiment, except that the light guiding rod 104 and the spacer 108 are replaced with a light guiding rod 104A and a spacer 108A.
  • the light guiding rod 104A and the spacer 108A each have a tapered engaging portion.
  • the light guiding rod 104A is fixed to the spacer 108A with an adhesive (not shown) or the like.
  • the light guiding rod 104A and the spacer 108A each has a tapered engaging portion, so that light from the LED 110 can be reflected toward the edge of the light guiding rod 104A, and light use efficiency can be expected to increase.
  • the second embodiment can also provide an LED lighting device capable of preventing leakage light.
  • Fig. 10 is an exploded perspective view of an LED lighting device 1 of the third embodiment.
  • Fig. 11 is a cross-sectional view of the LED lighting device 1 of the third embodiment.
  • the LED lighting device 1 of the third embodiment has the same structure as the LED lighting device of the first embodiment shown in Figs. 1 and 2 , except that the light guiding rod 104 and the spacer 108 are replaced with a light guiding rod 105 and a spacer 108B, respectively.
  • the light guiding rod 105 of the third embodiment includes a cylindrical portion and a protruding portion 400 formed on the side of the spacer 108B.
  • This protruding portion 400 has a flange-like shape so as to prevent the light guiding rod 105 from falling off.
  • the light guiding rod 105 and the spacer 108B are not bonded to each other with an adhesive.
  • the spacer 108B has the same structure as the spacer 108, except for having a recess to accommodate the protruding portion 400 of the light guiding rod 105.
  • the light guiding rod 105 has the protruding portion 400 that does not contribute to lighting. This is to facilitate the assembling by not bonding the light guiding rod 105 to the spacer 108B.
  • This protruding portion 400 is formed with a curved surface or a combination of flat surfaces.
  • the protruding portion 400 is not necessarily mirror-finished, and might have some scattering faces.
  • light reflected or scattered by the protruding portion 400 enters a side surface 203 on the opposite side of the central axis 210 of the light guiding rod 105, some of the light does not satisfy the total reflection conditions depending on the incident angle, and exits as it is.
  • some of the light that has entered the light guiding rod 105 from a surface of the protruding portion 400 does not satisfy the total reflection conditions in the light guiding rod 105, and exits as it is. These are the cause of leakage light.
  • Fig. 12 shows a photograph of leakage light from the protruding portion 400. Three bright lines can be seen in Fig. 12 . This is because light that has been scattered by three corner portions 300, 300A, and 300B of the protruding portion 400 has exited without totally-reflected in the light guiding rod 105.
  • the corner portion 300 is a corner portion on the surface of the protruding portion 400 on the side of the LED 110
  • the corner portion 300A is a corner portion that is formed on the surface of the protruding portion 400 on the opposite side from the side of the LED 110 and faces the corner portion 300.
  • the corner portion 300B is the joining portion between the cylindrical portion of the light guiding rod 105 and the protruding portion 400.
  • a light absorbing portion 302 is provided on the surface of the cover 102 facing the light guiding rod 105, as shown in Fig. 13 , as in the first and second embodiments.
  • the length L of the light absorbing portion 302 satisfies the condition expressed as L > D / ⁇ n 2 ⁇ 1 ⁇ ⁇ .
  • D represents the diameter of the light guiding rod 105
  • n represents the refractive index of the medium of the light guiding rod 105.
  • D of the light guiding rod 105 is the diameter of the cylindrical portion not including the protruding portion 400.
  • the length L of the light absorbing portion 302 is the length from the boundary between a side surface 202 of the light guiding rod 105 and the protruding portion 400.
  • ⁇ represents the correction factor of the protruding portion 400. This correction factor ⁇ is determined in accordance with the shape of the protruding portion 400.
  • the shape of the protruding portion 400 is not limited to the shape shown in Fig. 13 , but may be any of the example shapes shown in Figs. 14 through 18 .
  • Fig. 14 shows the relevant components of an LED lighting device 1 according to a first modification of the third embodiment.
  • the LED lighting device 1 of the first modification has the same structure as the LED lighting device of the third embodiment, except that the light guiding rod 105 and the cover 102 are replaced with a light guiding rod 105A and a cover 102A, respectively.
  • the light guiding rod 105A has the same structure as the light guiding rod 105, except that the joining portion between the cylindrical portion and the protruding portion 400 is in a tapered shape.
  • the cover 102A has a structure in which the portion corresponding to the joining portion is also in a tapered shape.
  • the length L of the light absorbing portion 302 of the first modification also satisfies the condition expressed as L > D / ⁇ n 2 ⁇ 1 ⁇ ⁇ .
  • Fig. 15 shows the relevant components of an LED lighting device 1 according to a second modification of the third embodiment.
  • the LED lighting device 1 of the second modification has the same structure as the LED lighting device of the first modification, except that the light guiding rod 105A is replaced with a light guiding rod 105B.
  • the light guiding rod 105B has the same structure as the light guiding rod 105A, except that the joining portion is a smooth, round portion, instead of a tapered portion.
  • the length L of the light absorbing portion 302 of the second modification also satisfies the condition expressed as L > D / ⁇ n 2 ⁇ 1 ⁇ ⁇ .
  • Fig. 16 shows the relevant components of an LED lighting device 1 according to a third modification of the third embodiment.
  • the LED lighting device 1 of the third modification has the same structure as the LED lighting device of the first modification shown in Fig. 14 , except that the light guiding rod 105A is replaced with a light guiding rod 105C.
  • This light guiding rod 105C has the same structure as the light guiding rod 105A, except that the tapered portion of the joining portion continues to the end portion of the protruding portion 400 or the side surface of the flange.
  • the length L of the light absorbing portion 302 of the third modification also satisfies the condition expressed as L > D / ⁇ n 2 ⁇ 1 ⁇ ⁇ .
  • Fig. 17 shows the relevant components of an LED lighting device 1 according to a fourth modification of the third embodiment.
  • the LED lighting device 1 of the fourth modification has the same structure as the LED lighting device of the first modification shown in Fig. 14 , except that the light guiding rod 105A and the cover 102A are replaced with a light guiding rod 105D and the cover 102 of the first embodiment, respectively.
  • the light guiding rod 105D has the same structure as the light guiding rod 105A, except that the cross-sectional shape of the end portion of the protruding portion 400 is a round shape, instead of a rectangular shape. That is, the side surface of the flange of the protruding portion 400 has a rounded shape.
  • the length L of the light absorbing portion 302 of the fourth modification also satisfies the condition expressed as L > D / ⁇ n 2 ⁇ 1 ⁇ ⁇ .
  • Figs. 18A and 18B show the relevant components of an LED lighting device 1 according to a fifth modification of the third embodiment.
  • the LED lighting device 1 of the fifth modification has the same structure as the LED lighting device of the third embodiment shown in Fig. 13 , except that the light guiding rod 105 and the spacer 108B are replaced with a light guiding rod 105E and a spacer 108C, respectively.
  • the light guiding rod 105E has the same structure as the light guiding rod 105, except that the protruding portion 400 is not formed in a ring-like shape around the entire circumference of the cylindrical portion, but protruding portions 400 are discretely arranged around the circumference of the cylindrical portion.
  • the spacer 108C is formed with first recesses to accommodate the protruding portions 400, and second recesses to accommodate the portions of the cylindrical portion at which the protruding portions 400 of the light guiding rod 105E are not formed.
  • the number of the protruding portions 400 may be any number not smaller than one, and may be two, three, or four, for example. Also, the protruding portions 400 may have any shape, as long as they can prevent the light guiding rod 105E from falling off. In any case, the length L of the light absorbing portion 302 is the length from the boundary between a side surface 202 of the light guiding rod 105E and the protruding portions 400.
  • the length L of the light absorbing portion 302 of the fifth modification also satisfies the condition expressed as L > D / ⁇ n 2 ⁇ 1 ⁇ ⁇ .
  • the light absorbing portion 302 is provided on the surface of the cover facing the light guiding rod.
  • an LED lighting device capable of preventing leakage light can be provided, as in the first embodiment.
  • FIG. 19 is a cross-sectional view of the relevant components of the LED lighting device of the fourth embodiment.
  • the LED lighting device 1 of the fourth embodiment has the same structure as the LED lighting device of the third embodiment shown in Fig. 13 , except that the light guiding rod 105 and the spacer 108B are replaced with a light guiding rod 105F and a spacer 108D, respectively.
  • the light guiding rod 105F has male screws formed at side end portions of the protruding portion 400. Meanwhile, the spacer 108D has female screws formed at side portions of the recess to accommodate the protruding portion 400.
  • the female screws engage with the male screws of the light guiding rod 105F. That is, the light guiding rod 105F is screwed into the spacer 108D, and is fixed thereto. Consequently, the contact area between the light guiding rod 105F and the spacer 108D becomes larger. Thus, the light guiding rod 105F and the spacer 108D can be firmly fixed to each other.
  • the length L of the light absorbing portion 302 of the fourth embodiment also satisfies the condition expressed as L > D / ⁇ n 2 ⁇ 1 ⁇ ⁇ .
  • the fourth embodiment can also provide an LED lighting device capable of preventing leakage light.
  • Fig. 20 is an exploded perspective view of an LED lighting device 1 of the fifth embodiment.
  • Fig. 21 is a cross-sectional view of the LED lighting device 1 of the fifth embodiment.
  • Fig. 22 is a cross-sectional view of the relevant components of the LED lighting device 1 of the fifth embodiment.
  • the LED lighting device 1 of the fifth embodiment has the same structure as the LED lighting device of the first embodiment shown in Fig. 6 , except that the cover 102 is eliminated, and the spacer 108 is replaced with a spacer 108E. Further, a light absorbing portion 302A is provided at the corner portion 300 of the light guiding rod 104. This light absorbing portion 302A is formed with a matte-black coating material, for example.
  • the light guiding rod 104 is fixed to the recess of the spacer 108E with an adhesive (not shown) or the like.
  • the light absorbing portion 302A coated with a matte-black coating material is provided at the corner portion 300 of the light guiding rod 104, so that no light will be reflected or scattered by the corner portion 300 of the light guiding rod 104.
  • the light guiding rod 104 is fixed to the spacer 108E with an adhesive (not shown), but the light absorbing portion 302A may also serve as the adhesive.
  • the fifth embodiment can also provide an LED lighting device capable of preventing leakage light.
  • the LED lighting device 1 of the fifth embodiment may be equipped with the above described cover 102 of LED lighting device of the first embodiment shown in Fig. 6 . In this case, further unintended leakage light can be cut, and more leakage light can be prevented.
  • the light absorbing portion 302 is preferably provided on the surface of the cover 102 facing the side surface of the light guiding rod 104, as in the first embodiment.
  • FIG. 23 is a cross-sectional view of the relevant components of the LED lighting device 1 of the sixth embodiment.
  • the LED lighting device 1 of the sixth embodiment has the same structure as the LED lighting device of the second embodiment shown in Fig. 9 , except that the cover 102 is eliminated, the spacer 108A is replaced with a spacer 108F, and the light absorbing portion 302A is provided at the tapered portion of the light guiding rod 104A.
  • the spacer 108F differs from the spacer 108A in that the entire engaging portion to be engaged with the light guiding rod 104A is in a tapered shape.
  • the engaging portion of the spacer 108A partially has a flat portion to support part of the incidence surface 200 of the light guiding rod 104A.
  • a matte-black coating material or the like is used as the light absorbing portion 302.
  • the light guiding rod 104A is fixed to the tapered portion of the spacer 108F with an adhesive (not shown) or the like.
  • the light absorbing portion 302A may also serve as the adhesive.
  • the light absorbing portion 302A is provided at the tapered portion of the light guiding rod 104A. Accordingly, light reflected or scattered by the tapered portion can be absorbed by the light absorbing portion 302A, and leakage light can be prevented.
  • the LED lighting device 1 of the this embodiment may be equipped with the above described cover 102 of LED lighting device of the second embodiment shown in Fig. 9 . In this case, further unintended leakage light can be cut, and more leakage light can be prevented.
  • the light absorbing portion 302A is preferably provided on the surface of the cover 102 facing the side surface of the light guiding rod 104A, as in the first embodiment.
  • Fig. 24 is an exploded perspective view of an LED lighting device 1 of the seventh embodiment.
  • Fig. 25 is a cross-sectional view of the LED lighting device 1 of the seventh embodiment.
  • Fig. 26 is a cross-sectional view of the relevant components of the LED lighting device 1 of the seventh embodiment.
  • the LED lighting device 1 of the seventh embodiment has the same structure as the LED lighting device of the third embodiment shown in Fig. 13 , except that the light absorbing portion 302 is eliminated, the cover 102 is replaced with a cover 102B, and the light absorbing portion 302A is provided on the surface of the protruding portion 400 of the light guiding rod 105, or on the surface facing the side surface of the recess of the spacer 108B and the surface of the flange of the protruding portion 400 in contact with the cover 102B.
  • a matte-black coating material for example, is used as the light absorbing portion 302A, and this black coating material is applied onto the surface of the protruding portion 400, to form the light absorbing portion 302A.
  • the cover 102B has the same shape as the cover 102, except that the portion in contact with the protruding portion 400 of the light guiding rod 105 is cut off by the amount equivalent to the thickness of the light absorbing portion 302A.
  • the light guiding rod 105 has the protruding portion 400 as in the third embodiment.
  • This protruding portion 400 is designed to prevent the light guiding rod 105 from falling off when the LED lighting device 1 is put upside down.
  • the light absorbing portion 302A is provided on the protruding portion 400.
  • the region on which the light absorbing portion 302A is the region protruding as the protruding portion 400, excluding the incidence surface 200 of the light guiding rod 105 and the side surfaces 202 and 203 substantially perpendicular to the incidence surface 200.
  • the light absorbing portion 302A no light is reflected or scattered by corner portions 300, 300A, and 300B of the light guiding rod 105.
  • no light enters the light guiding rod 105 from the surface of the protruding portion 400 of the light guiding rod 105 located between the corner portion 300 and the corner portion 300A, and the surface located between the corner portion 300A and the corner portion 300B.
  • Fig. 27 the effects to be achieved in a case where the light absorbing portion 302A is provided on the protruding portion 400 are described.
  • the photograph in the upper half of Fig. 27 shows the light guiding rod 105 at a time of the lighting device is off (left) and at a time of the lighting device is on (right) in a case where the light absorbing portion 302A has not been applied to the protruding portion 400 (before the measures are taken).
  • the photograph in the lower half of Fig. 27 shows the light guiding rod 105 at a time of the lighting device is off (left) and at a time of the lighting device is on (right) in a case where the light absorbing portion 302A has been applied to the protruding portion 400 (after the measures are taken).
  • the shape of the protruding portion 400 is not limited to the shape shown in Fig. 26 , but may be any of example shapes according to first through fifth modifications shown in Figs. 28 through 32 .
  • Fig. 28 is a cross-sectional view of the relevant components of an LED lighting device 1 according to a first modification of the seventh embodiment.
  • the LED lighting device 1 of the first modification has the same structure as the LED lighting device of the first modification of the third embodiment shown in Fig. 14 , except that the light absorbing portion 302A is provided on the tapered portion and the side surface of the protruding portion 400 of the light guiding rod 105A.
  • a matte-black coating material, for example, is used as the light absorbing portion 302A.
  • Fig. 29 is a cross-sectional view of the relevant components of an LED lighting device 1 according to a second modification of the seventh embodiment.
  • the LED lighting device 1 of the second modification has the same structure as the LED lighting device of the second modification of the third embodiment shown in Fig. 15 , except that the light absorbing portion 302A is provided on the round portion and the side surface of the protruding portion 400 of the light guiding rod 105B.
  • a matte-black coating material, for example, is used as the light absorbing portion 302A.
  • Fig. 30 is a cross-sectional view of the relevant components of an LED lighting device 1 according to a third modification of the seventh embodiment.
  • the LED lighting device 1 of the third modification has the same structure as the LED lighting device of the third modification of the third embodiment shown in Fig. 16 , except that the light absorbing portion 302A is provided on the tapered portion and the side surface of the protruding portion 400 of the light guiding rod 105C.
  • a matte-black coating material, for example, is used as the light absorbing portion 302A.
  • Fig. 31 is a cross-sectional view of the relevant components of an LED lighting device 1 according to a fourth modification of the seventh embodiment.
  • the LED lighting device 1 of the fourth modification has the same structure as the LED lighting device of the fourth modification of the third embodiment shown in Fig. 17 , except that the light absorbing portion 302A is provided on the round portion of the protruding portion 400 of the light guiding rod 105D.
  • a matte-black coating material, for example, is used as the light absorbing portion 302A.
  • Fig. 32A is a cross-sectional view of the relevant components of an LED lighting device 1 according to a fifth modification of the seventh embodiment.
  • Fig. 32B is a perspective view of the light guiding rod.
  • the LED lighting device 1 of the fifth modification has the same structure as the LED lighting device of the fifth modification of the third embodiment shown in Figs. 18A and 18B , except that the light absorbing portion 302A is provided on the round portion of the protruding portion 400 of the light guiding rod 105E.
  • a matte-black coating material for example, is used as the light absorbing portion 302A.
  • the protruding portion 400 is not ring-shaped like a flange, but forms part of a ring.
  • the number of the protruding portions 400 may be any number not smaller than one, and may be two, three, or four, for example. Further, the protruding portions 400 may have any shape, as long as they can prevent the light guiding rod 105E from falling off.
  • the light absorbing portion 302A is provided on the flange portion of the light guiding rod.
  • an LED lighting device capable of preventing leakage light can be provided, as in the first embodiment.
  • Fig. 33 is a cross-sectional view of the relevant components of an LED lighting device 1 according to an eighth embodiment.
  • the LED lighting device 1 of the eighth embodiment has the same structure as the LED lighting device of the fourth embodiment shown in Fig. 19 , except that the cover 102 is eliminated, and the light absorbing portion 302A is provided on the surface of the joining portion between the spacer 108D and the light guiding rod 105F in a state where the male screws of the light guiding rod 105F are screwed into the female screws of the spacer 108D.
  • a matte-black coating material for example, is used as the light absorbing portion 302A.
  • the light absorbing portion 302A is provided on the surface of the joining portion between the spacer 108D and the light guiding rod 105F.
  • the light absorbing portion 302A is provided on the surface of the joining portion between the spacer 108D and the light guiding rod 105F.
  • the eighth embodiment can also prevent leakage light.
  • Fig. 34 is a cross-sectional view of the relevant components of an LED lighting device 1 according to a ninth embodiment.
  • the LED lighting device 1 of the ninth embodiment has the same structure as the LED lighting device of one of the first through eighth embodiments and their modifications, except that the light guiding rod 104 is not supported by a spacer or the like, but the light guiding rod 104 is fixed by the globe 100 via fixing rods 150. This structure is described below, with the LED lighting device of the first embodiment being taken as an example.
  • the light guiding rod 104 of the first embodiment shown in Fig. 2 or 6 is supported and fixed by the fixing rods 150 fixed by the globe 100. That is, the light guiding rod 104 is fixed to the globe 100 by the fixing rods 150.
  • the spacer 108 is unnecessary, and the assembling is easier.
  • the light absorbing portion 302 is provided on the surface of the cover 102 facing the side surface of the light guiding rod 104, as in the first embodiment.
  • the fixing rods 150 should be able to fix the light guiding rod 104, and therefore, the fixing rods 150 may be designed to connect to the cover 102, for example. Further, the fixing rods 150 may have any shape, as long as the same effects can be achieved.
  • the globe 100 may hold the light guiding rod 104, for example.
  • the light absorbing portion 302 is provided, and thus, leakage light can be prevented as in the first embodiment.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Planar Illumination Modules (AREA)
EP16187443.3A 2015-09-10 2016-09-06 Dispositif d'eclairage a del Withdrawn EP3141794A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015178195A JP2017054708A (ja) 2015-09-10 2015-09-10 Ｌｅｄ照明装置

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EP3141794A1 true EP3141794A1 (fr) 2017-03-15

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6898590B2 (ja) * 2017-09-22 2021-07-07 東芝ライテック株式会社 ランプ装置および照明装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712163A (en) * 1980-08-30 1987-12-08 Oxley Robert F Indicator lamps
EP2109158A1 (fr) * 2008-04-08 2009-10-14 Ushiodenki Kabushiki Kaisha Dispositif de source lumineuse à DEL
US20130051061A1 (en) * 2011-08-25 2013-02-28 Cheol-jun Yoo Illumination device
WO2013027148A1 (fr) * 2011-08-19 2013-02-28 Koninklijke Philips Electronics N.V. Ampoules à lumière à del imitant la lumière d'une bougie
EP2584246A1 (fr) * 2011-10-20 2013-04-24 Chih-Shen Chou Lampe à diode électroluminescente haute efficacité
JP2014175126A (ja) * 2013-03-07 2014-09-22 Toshiba Lighting & Technology Corp スポットライト
WO2015061093A1 (fr) * 2013-10-25 2015-04-30 3M Innovative Properties Company Lumière étendue à semi-conducteurs et projecteur à lentille à guide de lumière et guide thermique intégré
US20150211709A1 (en) * 2012-07-27 2015-07-30 Sharp Kabushiki Kaisha Illumination device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6227904B2 (ja) * 2013-06-20 2017-11-08 スタンレー電気株式会社 Ｌｅｄ光源装置
JP6521226B2 (ja) * 2015-03-02 2019-05-29 東芝ライテック株式会社 ランプ装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712163A (en) * 1980-08-30 1987-12-08 Oxley Robert F Indicator lamps
EP2109158A1 (fr) * 2008-04-08 2009-10-14 Ushiodenki Kabushiki Kaisha Dispositif de source lumineuse à DEL
WO2013027148A1 (fr) * 2011-08-19 2013-02-28 Koninklijke Philips Electronics N.V. Ampoules à lumière à del imitant la lumière d'une bougie
US20130051061A1 (en) * 2011-08-25 2013-02-28 Cheol-jun Yoo Illumination device
EP2584246A1 (fr) * 2011-10-20 2013-04-24 Chih-Shen Chou Lampe à diode électroluminescente haute efficacité
US20150211709A1 (en) * 2012-07-27 2015-07-30 Sharp Kabushiki Kaisha Illumination device
JP2014175126A (ja) * 2013-03-07 2014-09-22 Toshiba Lighting & Technology Corp スポットライト
WO2015061093A1 (fr) * 2013-10-25 2015-04-30 3M Innovative Properties Company Lumière étendue à semi-conducteurs et projecteur à lentille à guide de lumière et guide thermique intégré

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