WO2012132567A1 - Dispositif d'éclairage, et instrument d'éclairage le comportant - Google Patents

Dispositif d'éclairage, et instrument d'éclairage le comportant Download PDF

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Publication number
WO2012132567A1
WO2012132567A1 PCT/JP2012/053019 JP2012053019W WO2012132567A1 WO 2012132567 A1 WO2012132567 A1 WO 2012132567A1 JP 2012053019 W JP2012053019 W JP 2012053019W WO 2012132567 A1 WO2012132567 A1 WO 2012132567A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
coupling member
leds
Prior art date
Application number
PCT/JP2012/053019
Other languages
English (en)
Japanese (ja)
Inventor
緒方　伸夫
堀山　真
中村　篤
花野　雅昭
Original Assignee
シャープ株式会社
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Publication of WO2012132567A1 publication Critical patent/WO2012132567A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources

Definitions

  • the present invention relates to an illumination device that emits light from a light source in a planar shape by a light guide plate, and an illumination device including the illumination device.
  • an LED Light ⁇ ⁇ Emitting ⁇ ⁇ Diode: light emitting diode
  • the LED lighting requires less power to produce the same brightness as the conventional incandescent lighting.
  • the low power consumption is characterized by the fact that less heat is generated for the power that has been lost as heat in the prior art, and the lighting apparatus has a low heat generation.
  • Patent Literature 1 discloses a lighting fixture that can illuminate a ceiling surface by emitting light toward the side and back of the fixture body using LEDs.
  • the lighting fixture 100 disclosed in Patent Document 1 is a ceiling-mounted ceiling light for home use. As shown in FIGS. 12A and 12B, the fixture main body 110 and the fixture main body 110 are provided. A translucent cover 101 that covers the front and side surfaces, and a light control body 102 that emits light from the peripheral edge portion 101a of the translucent cover 101 toward the side and back of the instrument main body 110 are provided.
  • the appliance main body 110 includes a light emitting module 120 having a plurality of LEDs and a lighting device 111 that lights the LEDs. As shown in FIGS. 12C and 12D, the light emitting module 120 is yellow excited by a base 121, a plurality of LED chips 122a mounted on the base 121, and the LED chips 122a. And a semiconductor light emitting element 122 configured to emit white light with high luminance and high output.
  • Patent Document 2 a technique used for a backlight of a liquid crystal display device is disclosed in Patent Document 2.
  • the backlight 200 for a display device disclosed in Patent Literature 2 is provided with a light emitting diode 201 below the light guide plate 210 so that its optical axis is orthogonal to the light guide plate 210. . Then, immediately above the light emitting diode 201 on the surface of the light guide plate 210, curved reflecting surfaces 211 and 211 are formed so as to reflect light from the light emitting diode 201 toward both ends of the light guide plate 210. A reflective sheet 202 is provided below the light emitting diode 201.
  • the number of the light-emitting diodes 201 can be reduced because the light-emitting diodes 201 need only be arranged on the center line of the light guide plate 210.
  • Japanese Patent Publication Japanese Patent Laid-Open No. 2010-140797 (published on June 24, 2010)” Japanese Patent Publication “Japanese Patent Laid-Open No. 2006-49324 (Released on February 16, 2006)”
  • the light guide plate 210 must be formed with reflecting surfaces 211 and 211 having curved surfaces. Therefore, since the light guide plate 210 has to be processed, the cost increases, and in particular, the processing of the large light guide plate has a problem that the area is large and difficult.
  • the amount of light emitted to the liquid crystal panel side becomes too large immediately above the light emitting diode 201 in the light guide plate 210, and is uniform over the entire light guide plate. There is a problem that irradiation is difficult.
  • the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide an illumination device that enables uniform irradiation over the entire light guide plate without increasing the number of light sources and processing the light guide plate. And providing a lighting device including the same.
  • an illumination device includes a flat light guide plate and a light source disposed on the back side of the light guide plate, and causes light emitted from the light source to enter the light guide plate.
  • An illumination device that irradiates light from the surface side of the light guide plate while totally reflecting and guiding the incident light inside the light guide plate, wherein the light source is incident on the light guide plate at an angle.
  • An optical coupling member that couples light emitted from the light guide plate and the light source, the light source emits light having a color temperature of 2000 K to 6000 K toward the optical coupling member, and The optical axis direction of the emitted light toward the optical coupling member is arranged so as to be orthogonal to the light guide plate.
  • the light coupling member that couples the light emitted from the light source is provided between the light guide plate and the light source so that light is incident on the light guide plate obliquely.
  • the light emitted from the light source on the back surface of the light guide plate is coupled to the light guide plate through the optical coupling member and is incident obliquely, and moves to the end of the light guide plate while totally reflecting inside the light guide plate.
  • the total reflection condition is broken by the optical path conversion element, and the light is emitted to the surface side of the light guide plate.
  • the present invention by providing an optical coupling member separate from the light guide plate, light is incident obliquely on the flat light guide plate and totally reflected inside the light guide plate to be guided to the whole. be able to. As a result, even if the light guide plate is not processed, incident light from the light source can be guided inside the light guide plate via the optical coupling member, and light can be irradiated uniformly from the light guide plate.
  • the light source is arranged so that the optical axis direction of the emitted light toward the optical coupling member is orthogonal to the light guide plate. For this reason, since it is not necessary to make the arrangement of the light source oblique to the flat light guide plate, the arrangement of the light source is easy and the structure is simple.
  • the light source emits light having a color temperature of 2000K to 6000K. For this reason, it can be appropriately used as a lighting device such as a ceiling light.
  • the lighting fixture of the present invention is characterized by including the lighting device in order to solve the above-described problems.
  • an illuminating device including an illuminating device that enables uniform irradiation over the entire light guide plate without increasing the number of light sources and processing the light guide plate.
  • the optical coupling member that couples the light emitted from the light source so that the light is incident obliquely on the light guide plate is provided between the light guide plate and the light source.
  • the light source emits light having a color temperature of 2000 K to 6000 K toward the optical coupling member, and the optical axis direction of the emitted light toward the optical coupling member is orthogonal to the light guide plate.
  • the lighting fixture of the present invention includes the lighting device as described above.
  • an illuminating device including an illuminating device that can uniformly irradiate the entire light guide plate without increasing the number of light sources and processing the light guide plate.
  • FIG. 1 is a cross-sectional view illustrating a configuration of a main part of a lighting device in a ceiling light as a lighting device according to an embodiment of a lighting device including a lighting device according to the present invention.
  • (A) is a perspective view from the surface side which shows the structure of the said ceiling light
  • (b) is a perspective view from the back surface side which shows the structure of the said ceiling light. It is a perspective view which shows the structure of the light source module in the said illuminating device.
  • (A) is sectional drawing which shows the optical path when the light radiate
  • (b) is principal part sectional drawing which shows the optical path near LED. It is.
  • (A) is sectional drawing which shows the optical path when the light radiate
  • (b) is principal part sectional drawing which shows the optical path of LED vicinity. is there.
  • (A) is sectional drawing which shows the optical path when the light radiate
  • (B) is a perspective view which shows the strip
  • (A) is a top view which shows the said light-guide plate
  • (b) is a graph which shows the luminance distribution on the string which passes along point A * B of (a).
  • (A) shows the structure of the modification of the said light-guide plate, Comprising: It is a top view which shows a rectangular light-guide plate, (b) is a top view which shows the light-guide plate which chamfered the rectangular corner
  • FIG. 1 It is a perspective view which shows the structure of the modification of the light source module in the said illuminating device, Comprising: A frame-shaped light source module. It is sectional drawing which shows the toning illumination in the said illuminating device.
  • A is sectional drawing which shows the structure of the conventional lighting equipment
  • (b) is a top view which shows the structure of the lighting equipment
  • (c) is sectional drawing which shows the structure of the illuminating device in the lighting equipment.
  • D is a plan view showing the configuration of the illumination device. It is a cross section which shows the structure of the backlight applied to the conventional liquid crystal display device.
  • FIGS. 1 to 11 An embodiment of the present invention will be described with reference to FIGS. 1 to 11 as follows.
  • FIG. 1 is a cross-sectional view illustrating a configuration of a main part of a lighting device in a ceiling light.
  • FIG. 2A is a perspective view from the front side showing the configuration of the ceiling light
  • FIG. 2B is a perspective view from the back side showing the configuration of the ceiling light.
  • FIG. 3 is a perspective view showing the configuration of the light source module from the surface side.
  • the “front surface” direction is the direction of the light irradiation surface in the lighting device of the present invention
  • the “back surface” direction is the opposite direction
  • the “side surface” direction is The direction is orthogonal to both the front surface direction and the back surface direction. That is, when the lighting device of the present invention is installed as a ceiling light on the ceiling, the “front surface” is the room (floor) side, and the “back surface” is the ceiling side.
  • the ceiling light 1 includes, for example, a disk-shaped lighting device 10, and the disk-shaped lighting device 10 includes a frame 20 on the outer periphery thereof.
  • a light source module 30 is provided on the diameter of the disk as shown in FIG.
  • the diameter of the ceiling light 1 is, for example, 550 mm, and the thinnest part is, for example, 10 mm.
  • the shape and each dimension of the ceiling light 1 it is not restricted to this.
  • the illuminating device 10 of the ceiling light 1 is composed of a diffusion sheet 11, a prism sheet 12, a light guide plate 13, and a light source module 30 in order from the surface side, as shown in FIG.
  • a portion of the back surface of the light guide plate 13 where the light source module 30 is not provided is provided with a reflection sheet 14 and a back chassis 15 that are openings.
  • the light source module 30 is provided with a sheet-shaped heat sink 32 on a light source holder 31 formed in a strip shape.
  • LED boards 34a and 34b on which LEDs (Light Emitting Diodes) 33a and 33b as light sources are mounted are provided on the heat sink 32.
  • LEDs 33a and 33b are used as the light sources.
  • the present invention is not limited to this.
  • an organic EL light emitting element or an inorganic EL light emitting element can be used.
  • the LEDs 33a and 33b emit light having a color temperature of 2000K to 6000K. That is, red light in the morning sun or sunset has a color temperature of about 2000K, and sunlight has a color temperature of about 5000K to 6000K.
  • a light source used in a backlight of a liquid crystal display device for example, an LED having a color temperature of 10,000 K to 20000 K is used.
  • a plurality of the LEDs 33a and 33b are provided in parallel in two rows.
  • an optical coupling member 35 is provided above the plurality of LEDs 33a and 33b.
  • the ceiling light 1 of the present embodiment includes a light guide plate 13 that irradiates light on the surface side, a light coupling member 35 as an optical element that couples light to the light guide plate 13, and the above
  • the light coupling plate 35 includes LEDs 33a and 33b that emit incident light, and the light guide plate 13, the light coupling member 35, and the LEDs 33a and 33b are arranged in this order from the front surface side to the back surface side of the lighting device 10. It consists of things. Therefore, the illuminating device 10 in the ceiling light 1 according to the present embodiment is a illuminating device 10 directly below the light source in which the LEDs 33 a and 33 b are provided below the light guide plate 13.
  • the optical coupling member 35 has a substantially semi-cylindrical cross section provided between the light guide plate 13 and the LEDs 33a and 33b, that is, a rod-like body. More specifically, it is a belt-like body having a semicircular cross section.
  • the material of the optical coupling member 35 is made of the same resin as that of the light guide plate 13.
  • the surface of the optical coupling member 35 on the light guide plate 13 side is a top flat surface 35a that abuts the flat light guide plate 13, and both ends from the top flat surface 35a. It consists of drooping curved surfaces 35b and 35b that respectively hang down to the side.
  • the hanging curved surfaces 35b and 35b can be, for example, cross-sectional parabolas shown in FIG.
  • the present invention is not limited to this, and a cross-sectional ellipse may be used as shown in FIGS.
  • a curved shape such as a bow having a top flat surface 35a, or a plane inclined obliquely from the top flat surface 35a is not limited to a parabola or a cross ellipse.
  • the surface of the optical coupling member 35 opposite to the light guide plate 13 side, that is, the lower end of the optical coupling member 35 is a lower flat surface 35c as shown in FIG. Further, a concave portion 35 d is formed in the central portion on the lower end side of the optical coupling member 35.
  • the present invention is not necessarily limited to this, and the recess 35d may not exist. That is, in the present embodiment, it is only necessary to secure an optical path to the light guide plate 13 for the light reflected by the suspended curved surfaces 35b and 35b, so that the portion that does not become the optical path can be cut out as a recess 35d. Thereby, cost reduction can be aimed at. It is also possible to provide a reflective sheet in the recess 35d. Thereby, irradiation from the light guide plate 13 on the top flat surface 35a to the surface side of the light guide plate 13 can be improved.
  • the LEDs 33a and 33b are provided close to the optical coupling member 35 below the lower flat surfaces 35c and 35c of the optical coupling member 35, respectively. These LEDs 33a and 33b, as shown in FIG. 4B and FIG. 5B, may be present on the end side with respect to the focal position F of the hanging curved surfaces 35b and 35b having a cross-section parabola or a cross-section ellipse. preferable.
  • the light emitted from the LED 33 a is reflected by the drooping curved surface 35 b of the cross-sectional parabola of the optical coupling member 35, and the reflected light is the top of the optical coupling member 35.
  • the light incident on the light guide plate 13 travels by being totally reflected inside the right side of the light guide plate 13 shown in FIG. 4A and colliding with a light scatterer which is an optical path changing unit (not shown).
  • the angle of traveling through the light plate 13 is changed, the total reflection condition is broken, the light is emitted from the surface side of the light guide plate 13, and is emitted from the ceiling light 1 through the prism sheet 12 and the diffusion sheet 11.
  • the light emitted from the LED 33b also proceeds symmetrically with the light from the LED 33a as shown in FIG.
  • Such an optical path is the same in the optical coupling member 35 having an elliptical cross section shown in FIGS.
  • the light emitted from the LED 33 a is reflected by a hanging curved surface 35 b having an elliptical cross section of the optical coupling member 35, and the reflected light is flat on the top of the optical coupling member 35. It reaches the surface 35a, and enters the light guide plate 13 obliquely while maintaining the arrival direction. Then, the light incident on the light guide plate 13 is totally reflected on the inner right side of the light guide plate 13 shown in FIG. 5A and collides with a light scatterer which is not shown in the figure, thereby colliding with the light guide plate.
  • the angle of traveling through 13 is changed, the total reflection condition is broken, the light is emitted from the surface side of the light guide plate 13, and is emitted from the ceiling light 1 through the prism sheet 12 and the diffusion sheet 11. Note that the light emitted from the LED 33b also proceeds symmetrically with the light from the LED 33a, as shown in FIG.
  • the shape of the hanging curved surfaces 35b and 35b of the optical coupling member 35 is a cross-sectional parabola or a cross-sectional ellipse
  • the light emitted from the LEDs 33a and 33b is reflected by the drooping curved surfaces 35b and 35b having a cross-sectional parabola or a cross-sectional ellipse.
  • the light can be efficiently combined to be incident on the light guide plate 13 from the top flat surface 35a, and the illumination light can be emitted from the ceiling light 1 as shown in FIG.
  • the cross-section ellipse can be coupled so that the light is focused and incident on the light guide plate 13, so that the coupling efficiency can be increased.
  • a strip-shaped light source module 30 is provided across the central portion, that is, the center line, of the disc-shaped ceiling light 1.
  • FIG. 7 (a) the chord passing through the points A and B that are about ⁇ 1/3 of the radius in the X-axis direction from the center of the light guide plate 13 is shown in FIG. 7 (b).
  • Light emitted from the light guide plate 13 having a luminance distribution can be obtained.
  • the ceiling light 1 of the present embodiment can obtain a uniform and smooth luminance distribution.
  • the light P emitted from the light source module 30 provided on the center line reaches the outer peripheral end 13a.
  • the light guide plate 13 of the present embodiment is made of, for example, an acrylic plate
  • the radial direction (normal direction to the tangent line Q) at the outer peripheral end 13a is orthogonal to the light source module 30 according to Snell's law.
  • the angle ⁇ formed by the direction is divided into a region S1 that is not totally reflected and regions S2 and S2 that are totally reflected with a boundary of about 42 degrees.
  • the region S1 that is not totally reflected is a central side portion of the diameter, and the regions S2 and S2 that are totally reflected are both side portions of the diameter. For this reason, in the present embodiment, the brightness of the entire light guide plate 13 is further uniformed by adjusting the arrangement pattern of the light scattering portion which is an optical path conversion element (not shown).
  • the light of the LEDs 33a and 33b is made incident from the back surface of the light guide plate 13, as shown in FIG.
  • a side edge type backlight has been conventionally used.
  • the light utilization efficiency of the conventional side edge type backlight is 75%.
  • the light use efficiency of the lighting apparatus 10 of the present embodiment was 88%. Therefore, it can be seen that the illumination device 10 of the present embodiment is superior in light utilization efficiency than the conventional side-edge type backlight. That is, in the conventional side edge type backlight, the linear expansion accompanying the temperature rise in the longitudinal direction of the light guide plate is large, so it is necessary to provide a gap between the LED and the light guide plate.
  • the LEDs 33a and 33b are provided directly below the light guide plate 13, so that the expansion dimension is small even when the light guide plate 13 is thermally expanded. Therefore, since it is not necessary to provide a gap, the light utilization efficiency can be increased.
  • the illumination device 10 of the present embodiment unlike the conventional side-edge type backlight, there is no light source at the end of the ceiling light 1 as shown in FIG. It is possible to provide the frame 20 directly at the end of the frame. As a result, surface light emission with a frame size of 6 mm or less is possible. Further, by forming the frame 20 from a transparent, translucent or milky white resin material, it is possible to emit light from the entire surface including the frame 20. By optimizing the shape and material of the frame 20, indirect illumination that emits light in the back surface direction is possible.
  • the illumination device 10 has a disk shape, for example.
  • the present invention is not limited to this, and various shapes may be used as shown in FIGS. 9 (a) to 9 (d). it can.
  • FIG. 9A shows a rectangular light guide plate 13
  • FIG. 9B shows a light guide plate 13 with rectangular corners chamfered
  • FIG. 9C shows an elliptical guide
  • FIG. 9D shows a light guide plate 13 which is a diamond-shaped light guide plate 13.
  • the amount of light in the light guide direction of the light from the light source module 30, that is, the direction orthogonal to the light source module 30 extending in a strip shape (traveling direction) is Decrease gradually.
  • the distribution of the dot pattern of the light scattering portion can obtain a uniform luminance distribution from the light guide plate 13 to the surface side by increasing the number of dot patterns as it goes in the traveling direction.
  • the amount of light is constant, and as a result, the distribution of the dot pattern of the light scattering portion is also uniform.
  • the rectangular portion is the same as FIG. 9A. That is, the amount of light gradually decreases in the light guide direction (traveling direction) of light from the light source module 30. For this reason, the distribution of the dot pattern of the light scattering portion can obtain a uniform luminance distribution from the light guide plate 13 to the surface side by increasing the number of dot patterns as it goes in the traveling direction. In the direction perpendicular to the light guide direction (vertical direction), the amount of light is constant, and as a result, the dot pattern distribution in the light scattering portion is also uniform.
  • the light quantity gradually decreases in the light guide direction (traveling direction) of the light from the light source module 30.
  • the distribution of the dot pattern of the light scattering portion can obtain a uniform luminance distribution from the light guide plate 13 to the surface side by increasing the number of dot patterns as it goes in the traveling direction.
  • the light is totally reflected.
  • the light proceeds in the vertical direction. Accordingly, it is necessary to reduce the dot pattern of the light scattering portion.
  • the prism sheet 12 is used for the purpose of hiding the dot print image. For this reason, it arrange
  • the prism sheet 12 can be abolished by forming the printing surface of the light scattering portion dot pattern on the light guide plate 13 in the back surface direction.
  • the diffusion plate 11 one having a thickness of 1 mm to 2 mm is used. About 1.5 mm is preferable.
  • the light guide plate 13, the prism sheet 12, and the diffusion plate 11 are in close contact with each other, but a spacer member (not shown) may be used to provide a space. For example, if a space of about 2 mm is maintained between the light guide plate 13 and the diffusion plate, the dot print image can be concealed even if the dot pattern print surface of the light scattering portion of the light guide plate 13 is formed in the surface direction. is there.
  • the light quantity gradually decreases in the light guide direction (traveling direction) of the light from the light source module 30.
  • the distribution of the dot pattern of the light scattering portion can obtain a uniform luminance distribution from the light guide plate 13 to the surface side by increasing the number of dot patterns as it goes in the traveling direction.
  • the light is totally reflected.
  • the light proceeds in the vertical direction. Accordingly, it is necessary to reduce the dot pattern of the light scattering portion.
  • the light source module 30 of the illuminating device 10 is provided in strip
  • it can be a ring shape that is a frame shape.
  • the frame-shaped light source module 30 that follows the shape of the illumination device 10, it is possible to easily achieve uniform luminance.
  • the light source module 30 is provided with two rows of LEDs 33 a and 33 b along the longitudinal direction of the optical coupling member 35. Accordingly, by adjusting the color temperatures of the two rows of LEDs 33a and 33b, as shown in FIG. 11, dimming illumination is possible.
  • the LED 33a is daylight white
  • the LED 33b is a light bulb color. This makes it possible to perform dimming illumination such as irradiating daylight on the outside of the ceiling light 1 and illuminating a light bulb color on the inside of the ceiling light 1.
  • the light source modules 30 are provided in one row, but the present invention is not necessarily limited to this, and a plurality of rows may be provided. Thereby, improvement in brightness and dimming illumination are possible.
  • two rows of LEDs 33a and 33b are provided along the longitudinal direction of optical coupling member 35. Accordingly, by adjusting the color temperatures of the two rows of LEDs 33a and 33b, as shown in FIG. 11, dimming illumination is possible.
  • the LED 33a is daylight white
  • the LED 33b is a light bulb color. This makes it possible to perform dimming illumination such as irradiating daylight on the outside of the ceiling light 1 and irradiating bulb light on the inside of the ceiling light 1.
  • the illumination device 10 includes the flat light guide plate 13 and the LEDs 33a and 33b arranged on the back side of the light guide plate 13, and guides the emitted light from the LEDs 33a and 33b.
  • the light is incident on the light plate 13, and the incident light is totally reflected inside the light guide plate 13 and irradiated from the surface side of the light guide plate 13 while being guided.
  • the optical coupling member 35 which couple
  • the LEDs 33a and 33b emit light having a color temperature of 2000K to 6000K toward the optical coupling member 35, and are arranged so that the optical axis direction of the outgoing light toward the optical coupling member 35 is orthogonal to the light guide plate 13. Has been.
  • the light coupling member 35 is provided between the light guide plate 13 and the LEDs 33a and 33b so as to couple light emitted from the LEDs 33a and 33b so that light is incident on the light guide plate 13 obliquely. It has been. For this reason, the light emitted from the LEDs 33 a and 33 b on the back surface of the light guide plate 13 is coupled to the light guide plate 13 through the optical coupling member 35 and is incident obliquely, and the light guide plate 13 is totally reflected inside the light guide plate 13. And the total reflection condition is broken at the light scattering part which is an optical path conversion element, and the light is emitted to the surface side of the light guide plate 13.
  • the LEDs 33 a and 33 b are arranged so that the optical axis direction of the emitted light toward the optical coupling member 35 is orthogonal to the light guide plate 13. For this reason, since it is not necessary to arrange LED33a * 33b diagonally with respect to the flat light-guide plate 13, arrangement
  • the LEDs 33a and 33b emit light having a color temperature of 2000K to 6000K. For this reason, it can be appropriately used as an illumination device such as the ceiling light 1.
  • the illuminating device 10 that can uniformly irradiate the entire light guide plate 13 without increasing the number of LEDs 33a and 33b and processing the light guide plate.
  • the light guide plate 13 is not processed and light is incident from below, so that the light guide plate 13 and the ceiling light 1 can be thinned. Specifically, a certain amount of thickness is required for processing the light guide plate 13. In this case, for example, when an edge light type light guide plate is considered, if the light guide plate 13 is made thinner than the widths of the LEDs 33a and 33b, the optical coupling ratio is lowered, so that there is a limit to thinning. In this regard, in the present embodiment, if the light guide plate 13 is thinned, the ceiling light 1 is thinned. Moreover, since the material of the light guide plate 13 can be saved, the cost can be reduced.
  • the LEDs 33a and 33b may be mounted so that their optical axes are perpendicular to the light guide plate 13, the assembly is simple. That is, in the case of the conventional edge light, since it is necessary to attach LED33a * 33b from a side surface, manufacture becomes a little difficult.
  • the optical coupling member 35 is provided in a band shape.
  • the optical coupling member 35 and the LEDs 33a and 33b 1: 1 it is not necessary to make the relationship between the optical coupling member 35 and the LEDs 33a and 33b 1: 1, and the plurality of LEDs 33a and 33b are covered with one optical member, so that the structure of the optical system can be simplified. . Further, since the LEDs 33a and 33b can also be provided along the optical coupling member 35, the wiring of the LEDs 33a and 33b is facilitated.
  • the optical coupling member 35 may be a double row. In this case, in particular, it is preferable to arrange them symmetrically with respect to the vertical or horizontal center line of the light guide plate 13 so that the luminance distribution of the double-row optical coupling members 35 is symmetrical. Further, when the optical coupling members 35 are in a double row, the luminance of light emitted from the surface of the light guide plate 13 is such that the luminance at the center of the flat light guide plate 13 is higher than the luminance at the end of the light guide plate 13. It is desirable to arrange in.
  • the optical coupling member 35 is provided on the center line in the vertical or horizontal direction of the flat light guide plate 13. This makes it possible to make the luminance symmetric about the vertical or horizontal center line of the light guide plate 13 as an axis. Therefore, it is possible to provide the lighting device 10 suitable for the luminance distribution.
  • the light source is composed of a plurality of LEDs 33a and 33b. Accordingly, the LEDs 33a and 33b have lower power consumption and lower heat generation than incandescent bulbs, and can save energy.
  • the ceiling light 1 as the lighting fixture of the present embodiment includes a lighting device 10.
  • the ceiling light 1 provided with the illuminating device 10 which enables uniform irradiation in the whole light-guide plate 13 without the increase in the number of LED33a * 33b and the process of the light-guide plate 13 can be provided.
  • a back chassis 15 that is a flat chassis that holds the light guide plate 13 in a flat surface is provided below the light guide plate 13, and the back chassis 15 is guided.
  • the optical plate holding surface has an opening at a portion where the optical coupling member 35 contacts the light guide plate 13, and the optical coupling member 35 and the LEDs 33 a and 33 b are located below the light guide plate holding surface of the back chassis 15.
  • the optical coupling member 35 and the LEDs 33a and 33b protrude on the back surface side of the light guide plate 13. Accordingly, it is possible to reduce the thickness of portions other than the optical coupling member 35 and the LEDs 33a and 33b. For this reason, the overall thickness can be reduced. Furthermore, by setting it as such a structure, it becomes excellent also in the surface of heat dissipation of LED33a * 33b. Moreover, since the back chassis 15 functions as a heat sink by connecting the light source module 30 to the back chassis 15, high heat dissipation performance can be obtained. As a result, the light emission efficiency of the LEDs 33a and 33b is also improved.
  • the LEDs 33 a and 33 b are arranged in two rows along the longitudinal direction of the optical coupling member 35. Specifically, the LEDs 33a and 33b are provided in two rows in parallel along the center line immediately below both ends of the lower end chord in the optical coupling member 35 having a semicircular cross section.
  • the two rows of LEDs 33a and 33b emit light in opposite directions, so that the line passing through the midpoint between the two rows is axially symmetric, that is, both sides of the light coupling member 35, that is, the light guide.
  • the light can be guided to both ends of the optical plate 13.
  • the line passing through the midpoint between the two rows coincides with the center line of the light guide plate 13
  • the light guide plate is guided to both ends of the light guide plate with the center line of the light guide plate 13 being axially symmetrical.
  • a luminance distribution that is axially symmetric about the 13 center lines can be obtained. Therefore, the luminance distribution can be made uniform in the light guide plate 13 with a simple structure. That is, when the LED 23a is single, there is a possibility that the portion directly above the LED 23a does not transmit light and becomes a dark part. This can be supplemented with light from other LEDs 23b.
  • the backlight 200 for a display device disclosed in Patent Document 2 has a problem that the luminance directly above the light emitting diode 201 becomes brighter than the surroundings and bright lines are generated, so that a uniform luminance distribution cannot be created.
  • this problem can be solved in the present embodiment.
  • the illumination device 10 of the present embodiment can be applied to a large planar light source as it is, and can provide a large ceiling light 1. Furthermore, since no member is required around the light guide plate 13, it can be applied to a larger ceiling light 1 by arranging them seamlessly.
  • the optical coupling member can be provided in a strip shape.
  • the optical coupling member and the light source 1 1, and a plurality of light sources are covered with one optical member, so that the structure of the optical system can be simplified.
  • the light source can be provided along the optical coupling member, wiring of the light source is facilitated.
  • the optical coupling member may be a double row.
  • the luminance of the light emitted from the surface of the light guide plate may be arranged so that the luminance at the center of the flat light guide plate is higher than the luminance at the end of the light guide plate. desirable.
  • the optical coupling member may be provided on a vertical or horizontal center line of the flat light guide plate.
  • the light source is preferably composed of a plurality of LEDs.
  • the LED has lower power consumption and lower heat generation than the incandescent bulb, and can save energy.
  • the lighting device of the present invention and the lighting device including the lighting device can be applied to ceiling-mounted ceiling lights, wall lighting attached to a wall surface, signboards, and the like. And as an application field, it can apply to various lighting fixtures, such as facilities, such as a store and an office, and business.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

La présente invention porte sur un dispositif d'éclairage (10), qui comporte une plaque de guidage de lumière plane (13) et des diodes électroluminescentes (DEL) (33a, 33b) positionnées du côté de surface arrière de la plaque de guidage de lumière (13). Une lumière émise à partir des diodes électroluminescentes (33a, 33b) est incidente sur la plaque de guidage de lumière (13), et la lumière incidente est émise à partir du côté de surface avant de la plaque de guidage de lumière (13) tout en étant totalement réfléchie et guidée à l'intérieur de la plaque de guidage de lumière (13). Un élément de couplage optique (35) pour coupler la lumière émise à partir des diodes électroluminescentes (33a, 33b) de telle manière que la lumière est incidente sur la plage de guidage de lumière (13) selon une certaine inclinaison est disposé entre la plaque de guidage de lumière (13) et les diodes électroluminescentes (33a, 33b). Les diodes électroluminescentes (33a, 33b) sont positionnées de telle manière qu'une lumière ayant une température de couleur de 2000 à 6000 K est émise vers l'élément de couplage optique (35) et que la direction de l'axe optique de la lumière émise vers l'élément de couplage optique (35) est orthogonale par rapport à la plaque de guidage de lumière (13).
PCT/JP2012/053019 2011-03-25 2012-02-09 Dispositif d'éclairage, et instrument d'éclairage le comportant WO2012132567A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-068974 2011-03-25
JP2011068974A JP5133439B2 (ja) 2011-03-25 2011-03-25 照明装置、及びそれを備えた照明機器

Publications (1)

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WO2012132567A1 true WO2012132567A1 (fr) 2012-10-04

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2995971A1 (fr) * 2012-09-26 2014-03-28 Valeo Vision Dispositif d'eclairage, notamment pour vehicule automobile.
US10716912B2 (en) 2015-03-31 2020-07-21 Fisher & Paykel Healthcare Limited User interface and system for supplying gases to an airway
US11324908B2 (en) 2016-08-11 2022-05-10 Fisher & Paykel Healthcare Limited Collapsible conduit, patient interface and headgear connector

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004158336A (ja) * 2002-11-07 2004-06-03 Advanced Display Inc 面状光源装置および該装置を用いた液晶表示装置
JP2010267610A (ja) * 2009-05-14 2010-11-25 Young Lighting Technology Inc 照明装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005332719A (ja) * 2004-05-20 2005-12-02 Mitsubishi Electric Corp 面状光源装置および該面状光源装置を備えた表示装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004158336A (ja) * 2002-11-07 2004-06-03 Advanced Display Inc 面状光源装置および該装置を用いた液晶表示装置
JP2010267610A (ja) * 2009-05-14 2010-11-25 Young Lighting Technology Inc 照明装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2995971A1 (fr) * 2012-09-26 2014-03-28 Valeo Vision Dispositif d'eclairage, notamment pour vehicule automobile.
WO2014048847A1 (fr) * 2012-09-26 2014-04-03 Valeo Vision Dispositif d'éclairage, notamment pour véhicule automobile
US10716912B2 (en) 2015-03-31 2020-07-21 Fisher & Paykel Healthcare Limited User interface and system for supplying gases to an airway
US11904097B2 (en) 2015-03-31 2024-02-20 Fisher & Paykel Healthcare Limited User interface and system for supplying gases to an airway
US11324908B2 (en) 2016-08-11 2022-05-10 Fisher & Paykel Healthcare Limited Collapsible conduit, patient interface and headgear connector

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JP2012204214A (ja) 2012-10-22

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