WO2017154841A1 - 面状発光モジュール及び照明装置 - Google Patents
面状発光モジュール及び照明装置 Download PDFInfo
- Publication number
- WO2017154841A1 WO2017154841A1 PCT/JP2017/008811 JP2017008811W WO2017154841A1 WO 2017154841 A1 WO2017154841 A1 WO 2017154841A1 JP 2017008811 W JP2017008811 W JP 2017008811W WO 2017154841 A1 WO2017154841 A1 WO 2017154841A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- light emitting
- emitting module
- grooves
- meandering
- Prior art date
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
- F21S2/005—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction of modular construction
-
- 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
-
- 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
- the present invention relates to a planar light emitting module and a lighting device.
- Patent Document 1 discloses an edge light type lighting device. An exploded perspective view of such an illuminating device is cited from the same document and shown in FIG.
- an illuminating device 1 light enters the light guide plate 2 from an LED (light emitting diode) 8 included in the light emitting units 3 a and 3 b arranged on the side surfaces 2 a and b of the light guide plate 2.
- LED light emitting diode
- the illumination device 1 light is emitted from the main surface 2 d of the light guide plate 2.
- the reflective sheet 4, the diffusion sheet 5, and the ridges 7 provided on the main surface 2d are drawn.
- a plurality of recesses 6 extending in the X-axis direction are formed at a predetermined pitch on the bottom surface 2c of the light guide plate 2 shown in FIG.
- the concave stripe 6 By the action of the concave stripe 6, the light changes its direction at the bottom surface 2c and proceeds toward the main surface 2d.
- the cross-sectional shape of the concave stripe 6 predetermined, it is possible to mitigate changes in luminance on the main surface 2d when the main surface 2d of the lighting device is viewed obliquely while changing the viewing angle.
- Glare is likely to occur when light sources arranged at intervals, such as LEDs in a row, are used. Glare is recognized as a difference between a portion that emits light strongly and a portion that emits light weakly when the main surface is observed at a predetermined viewing angle. It is an object of the present invention to suppress glare generated in a planar light emitting module including a side light receiving type light guide.
- a light guide and a light source are provided,
- the light guide is A side surface having a light receiving surface; A lower bottom surface having a deflection surface; An upper bottom surface having a light emitting surface; It has a plate shape with The light receiving surface faces the plurality of light sources, The light sources are arranged at predetermined intervals in a direction parallel to the deflection surface,
- the deflection surface has a plurality of grooves parallel to each other;
- the grooves are sequentially arranged in the direction from the vicinity of the light receiving surface toward the far side of the light receiving surface, and meander smoothly when the plate shape is viewed in plan view,
- the phase of the meandering is irregularly shifted between the plurality of grooves, In a cross section parallel to a normal line of the light receiving surface and a normal line of the reference plane in which the plate shape expands, an inclination angle formed by a tangent line of the contour line of the groove with respect to the reference plane is within the groove As the depth increases, it decreases monotonously
- Planar light emitting module [2] The inclination angle changes monotonously and smoothly in a range of at least 25 degrees to 65 degrees.
- the half-value angle is 45 ° or more in a light distribution curve in a plane parallel to the light receiving surface.
- the half-value angle is 60 ° or more.
- the ratio of the meandering width of the meandering to the meandering pitch is 0.06 or more.
- the maximum value of the angle formed by the groove and the light receiving surface is 20.7 ° or more.
- the invention of the present application can suppress glare generated in a planar light emitting module including a side light receiving type light guide.
- FIG. 6 is a graph of light distribution in Comparative Example 1. It is observation of the light emission surface of the comparative example 2.
- FIG. 10 is a graph of light distribution in Comparative Example 2. 10 is a graph of light distribution in Comparative Example 3. It is observation of the light emission surface of the comparative example 4.
- FIG. 2 is a graph of light distribution in Example 1. It is observation of the light emission surface of Example 2.
- FIG. 6 is a graph of light distribution in Example 2. It is observation in the 20 degree oblique view of the light emission surface of Example 1, 5 and 6.
- FIG. It is observation in the 30 degree oblique view of the light emission surface of Example 1, 5 and 6.
- FIG. It is sectional drawing of another example of the principal part of a planar light emitting module. It is a perspective view of another example of an illuminating device. It is a disassembled perspective view of the illuminating device which concerns on background art.
- FIG. 1 shows a planar light emitting module.
- the planar light emitting module includes a light guide 20 and light sources 30a-d.
- the planar light emitting module has a plurality of light sources, but the number is not limited. In the figure, four light sources are illustrated.
- the light guide 20 shown in FIG. 1 has a plate shape.
- the plate shape has a side surface 21 a, a lower bottom surface 22, and an upper bottom surface 23.
- the light guide 20 is cut at a cross-section 24 for illustration.
- the plate shape formed by the light guide 20 extends along the reference plane 27.
- the side surface 21a shown in FIG. 1 has a light receiving surface.
- the entire side surface 21a is a light receiving surface.
- the light receiving surface may be a part of the side surface 21a.
- the light receiving surface formed by the side surface 21a faces the light sources 30a-d.
- the side surface 21a may be a curved surface.
- the lower bottom surface 22 shown in FIG. 1 has a deflection surface.
- the entire lower bottom surface 22 is a deflection surface.
- the deflection surface may be a part of the lower bottom surface 22.
- the upper bottom surface 23 and the side surfaces 21a, b may be perpendicular to each other.
- the upper bottom surface 23 and the side surfaces 21a and 21b may or may not intersect with each other.
- the light sources 30a-d shown in FIG. 1 are arranged in a direction parallel to the deflection surface formed by the lower bottom surface 22.
- the light sources 30a-d are preferably arranged at a predetermined interval. The intervals may be equal.
- the lower bottom surface 22 shown in FIG. 1 has grooves 25a-d that are substantially V-shaped concave stripes.
- the lower bottom surface 22 functions as a deflection surface by the groove.
- the lower bottom surface 22 has a plurality of grooves, but the number is not limited. In the figure, four grooves are illustrated.
- the grooves 25a-d are parallel to each other.
- the grooves 25a-d do not cross each other.
- the grooves 25a-d shown in FIG. 1 are arranged in order from the vicinity of the light receiving surface formed by the side surface 21a toward the far side of the light receiving surface.
- the grooves 25a-d meander smoothly.
- the meandering phases between the grooves 25a-d are irregularly shifted from each other.
- the grooves 25a-d are preferably parallel to each other.
- the upper bottom surface 23 shown in FIG. 1 has a light emitting surface.
- the entire upper bottom surface 23 is a light emitting surface.
- the light emitting surface may be a part of the upper bottom surface 23.
- the upper bottom surface 23 and the side surfaces 21a, b may be perpendicular to each other.
- the upper bottom surface 23 and the side surfaces 21a and 21b may or may not intersect with each other.
- the cross section 24 is parallel to the normal line of the reference plane 27. In the drawing, the cross section 24 is perpendicular to the side surface 21 a and the reference plane 27.
- FIG. 2 schematically shows a cross-sectional view of the groove 25a shown in FIG.
- the groove has a contour line 29 in a cross section parallel to the ZY plane.
- the contour line 29 is smoothly curved. Therefore, the groove is composed of a curved surface having a smooth concave surface.
- the contour line 29 may be represented by a quadratic function.
- the contour line 29 has a shape in which spots represented by the spots 33a and 33b are smoothly connected.
- the contour line 29 is substantially V-shaped.
- the innermost part of the substantially V shape does not need to have an angle.
- the innermost part may be a gentle curve or flat.
- the V-shaped center line 28 is preferably perpendicular to the reference plane 27 as shown in FIG.
- the center line 28 is preferably parallel to the Z axis.
- channel so that it may become left-right symmetrical in a cross section. With this aspect, it is possible to suppress the deviation of the emitted light beam.
- the depth D (mm) shown in FIG. 2 is the depth in the direction from the bottom to the top in the figure.
- the maximum depth of the groove can be 0.002 to 0.1 mm, but is not limited thereto.
- the maximum value of the groove depth in the figure is 0.007 mm.
- the depth D of the spot 33a is larger than the depth D of the spot 33b.
- the direction of the depth D may be parallel to the Z axis.
- the outline 19 is the outline of the groove according to the comparative example.
- FIG. 3 schematically shows the contour line 29.
- the tangent line 34 touches the contour line 29 at the spot 33a.
- the tangent 34 forms a predetermined angle with respect to the reference plane 27, that is, an inclination angle I.
- the inclination angle I is an acute angle.
- the inclination angle I is an angle that can be specified at the spot 33b, other spots, and other points on the tangent line shown in FIG.
- the 3 is a function of depth D.
- the inclination angle I monotonously decreases as the depth D in the groove at the point where the inclination is to be specified increases.
- the inclination angle I changes smoothly according to the depth D.
- the inclination angle I changes monotonously and smoothly at least within a predetermined range of angles.
- the predetermined range of the angle is, for example, a range from 25 degrees to 65 degrees.
- the range is preferably from 40 degrees to 55 degrees.
- the width H of the groove can be 0.003 to 0.2 mm, but is not limited thereto. In the figure, the width H of the groove is 0.012 mm.
- the illumination device 40 may be configured by adding another member to the planar light emitting module.
- FIG. 4 is an example of a lighting device, and the lighting device of the present embodiment is not limited to these.
- the planar light emitting module shown in FIG. 1 can also be used as a lighting device as it is.
- the direction in which the lighting device is installed is not limited.
- the lighting device 40 may be installed on the ceiling so that the light emitting surface formed by the upper bottom surface 23 faces downward in the vertical direction.
- the light emitting surface formed by the upper bottom surface 23 is a surface having the ridges 41.
- the height of the ridges 41 can be 10 to 500 ⁇ m, preferably 10 to 50 ⁇ m.
- the height of the ridges 41 may not be constant.
- the ridge 41 in the figure is a lenticular lens.
- the arc may be a semicircle.
- the inclination angle of the ridge 41 with respect to the light emitting surface or the reference plane (FIG. 1, reference plane 27) can be 0 to 85 °.
- the ridge 4 are parallel to each other.
- the interval between the ridges 41 can be 50 to 300 ⁇ m.
- the ridge 41 is preferably perpendicular to the light receiving surface formed by the side surfaces 21a and 21b.
- the ridge 41 can be a straight line parallel to the normal of the light receiving surface.
- the reflective material 42 may or may not be provided so as to cover the deflection surface formed by the lower bottom surface 22.
- the reflective surface of the reflective material 42 may be diffusive while facing the deflecting surface.
- the reflecting surface having diffusibility is, for example, a non-mirror surface.
- the reflective material 42 may be a reflective sheet.
- the non-specular surface of the reflective material 42 does not face the deflection surface, the loss of light energy on the deflection surface side can be suppressed.
- the reflecting surface of the reflecting material 42 may be a mirror surface and may face the deflecting surface. Even in this aspect, the same effect as described above can be obtained.
- the lighting device can also emit light from the deflection surface.
- the space under the ceiling can be illuminated by the light emitting surface, and the ceiling can also be illuminated by the deflecting surface.
- the diffusion material 43 may or may not be provided so as to cover the light emitting surface formed by the upper bottom surface 23 shown in FIG.
- the diffusing material 43 may cover the side end of the light guide 20.
- the diffusion material 43 may be a diffusion plate or a diffusion sheet.
- the thickness of the diffusing material 43 can be 0.1 to 3 mm.
- the surface of the diffusing material 43 may be a mirror surface. Such a surface may have a texture.
- the loss of energy of light emitted from the light emitting surface can be suppressed by not providing the diffusing material 43 facing the light emitting surface formed by the upper bottom surface 23.
- a transparent material may be used in place of the diffusing material 43. The transparent material can protect the light emitting surface while suppressing loss of light energy.
- the total light transmittance (T.T) of the diffusing material 43 is preferably 70% or more.
- the haze value of the diffusing material 43 is preferably 80% or more.
- the illumination device 40 includes a rod-like light source unit 45a having light sources 30a-d.
- the light guide 20 further has a side surface 21b.
- the side surface 21b faces the side surface 21a.
- the side surface 21a faces the light source unit 45b.
- the light source unit 45b faces the light source unit 45a with the light guide 20 interposed therebetween.
- the light source unit 45b has the same configuration as the light source unit 45a. For this reason, the light-emitting surface formed by the upper bottom surface 23 can be uniformly emitted by the light source units 45a and 45b.
- FIG. 5 is a plan view of the planar light emitting module.
- the lower part of FIG. 5 is a front view of the planar light emitting module.
- the central portion of the light guide 20 is omitted by a broken line.
- the light guide 20 in plan view has a square or rectangular shape.
- the length of one side of the square may be 600 to 1200 mm.
- the vertical and horizontal lengths of the rectangle may each be between 180 and 1200 mm.
- the shape of the light guide 20 in a plan view can be a rectangle having a width of 180 (Y-axis direction) and a length of 1200 mm (X-axis direction).
- the light guide 20 viewed in plan has a square shape of 600 mm in length and width.
- the thickness of the light guide 20 shown in FIG. 5 can be 1 to 4 mm. In the following examples and comparative examples, the thickness of the light guide is 3 mm.
- the width of the light guide 20 is represented by a length L.
- the light guide 20 has a plurality of grooves including grooves 25a-d in the width.
- the grooves 25a-d are represented by a base line representing the center of the groove.
- the outer shape of the groove is partially omitted.
- the light sources including the light sources 30a to 30d shown in FIG. 5 are each composed of LEDs and constitute a light source group 31a.
- the light source group 31b is located on the opposite side of the light source group 31a with the light guide 20 interposed therebetween.
- the light source group 31b faces the side surface 21b.
- the light receiving surface formed by the side surface 21 b and the side surface 21 a is perpendicular to the light emitting surface formed by the upper bottom surface 23.
- the linear light source groups 31 a and 31 b are arranged on the side edges of the light guide 20.
- a ridge may be provided on the light emitting surface formed by the upper bottom surface 23 shown in FIG.
- a lenticular lens having an aspect ratio of 20% is provided on the light emitting surface formed by the upper bottom surface 23.
- the height of the lenticular lens is 12.5 ⁇ m, the width is 50 ⁇ m, and the pitch is 50 ⁇ m.
- the meandering grooves 25a-d meander smoothly. Between these grooves, the meandering phases are irregularly shifted from each other. Further, as described above, the groove 25a is formed of a curved surface having a smooth concave surface (FIG. 2). The inclination angle I formed by the tangent to the contour line of the groove with respect to the reference plane monotonously decreases as the depth D in the groove increases, and changes smoothly according to the depth D (FIG. 3). .
- FIG. 6 schematically shows the base line and the contour line 29 of the groove 25a in plan view.
- a contour line 29 intersecting with the base line of the groove 25a is continuously represented.
- the meandering shape of the groove 25a was a so-called sinusoidal curve.
- the meandering shape may be a parabola.
- the pitch P shown in FIG. 6 is the meandering pitch of the grooves 25a.
- the meandering pitch P is a so-called meandering wavelength.
- the meandering width M is the meandering width of the meandering of the groove 25a.
- the meandering width is a so-called meandering amplitude.
- the interval between the grooves is preferably larger than twice the meandering width M (FIG. 6).
- the interval between the centers of the grooves is preferably larger than (meander width M) ⁇ 2 + (groove width).
- the distance between the centers of the grooves is preferably less than 2 mm.
- the meandering width M may be 200 ⁇ m or less.
- the pitch P can be set to 0.5 to 5 mm.
- the lines of sight 37a and b represent virtual lines of sight of an observer looking at the planar light emitting module.
- the lines of sight 37a and b intersect the light emitting surface formed by the upper bottom surface 23 in the vicinity of the side surfaces 21a and b, respectively.
- the angles formed by the lines of sight 37a, b and the normal line of the upper bottom surface 23 are the viewing angles Sa, Sb, respectively.
- the planar light emitting module emits light in the direction opposite to the arrow of the line of sight 37a, b.
- the lines of sight 37a and b respectively represent oblique views with respect to the planar light emitting module.
- the lines of sight 37a and b each represent a plan view of the planar light emitting module.
- the planar light emitting module shown in FIG. 5 is further observed with a goniophotometer.
- Deflection directions U, V, and W shown in FIG. 5 indicate degration directions of the goniophotometer at the measurement position G.
- Let F be the distance between the measurement position G and the light-receiving surface formed by the side surface 21a.
- the measurement position and the distance F between the measurement position and the light receiving surface are set on the side surface 21b.
- the deflection direction U is parallel to the light receiving surface formed by the side surface 21a or the side surface 21b. Therefore, the plane to which the deflection direction U belongs is parallel to the tube axis.
- the tube axis is the long axis of the light source groups 31a and 31b, and is parallel to the light receiving surface.
- the goniophotometer changes the angle at which the luminous intensity is observed, that is, the so-called light receiving angle, on a plane parallel to the light receiving surface. Observation was performed on both sides of the light-emitting surface in the range of 0 ° to 90 ° with the normal direction Z-axis of the light emitting surface being 0 °. Note that the positive side of the light receiving angle is in the positive direction of the X axis.
- the angle change direction V is perpendicular to the light receiving surface formed by the side surface 21a or the side surface 21b. Therefore, the plane to which the deflection direction V belongs is perpendicular to the tube axis. Furthermore, the goniophotometer changes the angle at which the light intensity is observed, that is, the so-called light receiving angle, on a surface perpendicular to the light receiving surface. Observation was performed on both sides of the light-emitting surface in the range of 0 ° to 90 ° with the normal direction Z-axis of the light emitting surface being 0 °. Note that the light reception angle is on the negative side in the positive direction of the Y axis.
- the angle change direction W forms 45 ° with respect to the light receiving surface formed by the side surface 21a or the side surface 21b. Therefore, the plane to which the angle change direction W belongs forms 45 ° with respect to the tube axis. Furthermore, the goniophotometer changes the angle at which the light intensity is observed, that is, the so-called light receiving angle, on a surface that forms 45 ° with respect to the light receiving surface. Observation was performed on both sides of the light-emitting surface in the range of 0 ° to 90 ° with the normal direction Z-axis of the light emitting surface being 0 °.
- Table 1 shows the shape characteristics of the planar light emitting modules according to Comparative Examples 1 to 8 and Examples 1 to 6 and the measured optical performance values. Details of the measured optical performance value will be described later.
- the planar light emitting module of Comparative Example 1 includes a light guide having a deflection surface formed by a groove of the contour line 19 shown in FIG.
- the contour line 19 has a two-stage linear V shape.
- FIG. 7 shows the luminance distribution (half of the light guide 20 on the 21b side) when the light emitting surface of the light guide of Comparative Example 1 is viewed in plan.
- the scale in FIG. 7 was 0-8,000 nit.
- the brightness scale (Scale) is expressed in gray scale gradation when the minimum brightness is 0 and the maximum brightness is 8000 cd / m 2 .
- the white side represents high luminance
- the black side represents low luminance.
- the groove according to Comparative Example 1 has a linear shape parallel to the light receiving surface and does not meander.
- the other configuration of the planar light emitting module of Comparative Example 1 is the same as that of the planar light emitting module shown in FIG.
- the light emitting area of the LED was 2.5 mm in the thickness direction (Z direction) of the light guide plate, 5.6 mm in the X direction, and the LED non-light emitting length was 6.6 mm.
- the LED non-light emission length represents a distance where no light is emitted between the LED and the adjacent LED. Unless otherwise specified, the same applies to the following comparative examples and examples.
- a high brightness portion and a hot spot were formed in the vicinity of the light receiving surface formed by the side surface 21b (FIG. 5).
- the hot spots were arranged in a lattice shape and formed in a pantograph shape. Continuous hot spots were recognized as bright lines. The area around the hot spot was recognized as a dark line.
- FIG. 8 is a graph showing the light distribution of Comparative Example 1.
- the graph represents the change in luminous intensity in the direction of deflection U, V, W (FIG. 5).
- the unit of luminous intensity is cd, and the curve of luminous intensity change indicates luminous intensity (cd) per 1000 lm.
- the measurement position of the light distribution was a point away from the side surface 21a by a distance F (FIG. 5).
- the distance F was 540 mm.
- FIG. 9 shows the planar light emitting module observed through the diffusion plate.
- a diffusion plate as a diffusion material equivalent to the diffusion material 43 shown in FIG. 4 was attached to the light emitting surface of the same planar light emitting module as that of Comparative Example 1.
- the correction of the diffusion plate was 0.691.
- the scale in FIG. 9 was 0-6,000 nit.
- the planar light emitting module of Comparative Example 3 is the same as the planar light emitting module of Comparative Example 1 except that the groove has a single-stage linear V shape.
- the angle I formed by the slope formed by the one-stage V-shape and the lower bottom surface 22 was 40 °. As shown in FIG. 11, irregularities were found in the curve representing the light distribution in not only the variable angle direction U (FIG. 5) but also the variable angle direction V (FIG. 5).
- a two-stage V-shaped groove as in Comparative Example 1 is used, so that It is possible to reduce unevenness, that is, variation in emitted light intensity. That is, the two-stage V-shaped groove alleviates a change in surface luminance when viewed obliquely.
- variable angle directions V and W (FIG. 5), that is, in the direction parallel to the normal line of the light receiving surface, etc. only by the two-stage V-shaped groove.
- Such variations are perceived by the human eye as glare.
- one goal was to effectively suppress such glare without relying on a diffusing material.
- the planar light emitting module of Comparative Example 4 was provided with a groove having a two-stage V-shaped cross section equivalent to the planar light emitting module of Comparative Example 1.
- the depth of the groove was 7.0 ⁇ m, and the width of the groove was 11.7 ⁇ m.
- the groove was linear.
- the planar light emitting module has the same ridges as the ridges 41 shown in FIG. However, unlike the ridge 41, in Comparative Example 4, the ridge was meandered.
- the meandering width of the convex meandering was 10 ⁇ m.
- the pitch of the convex meandering was 3 mm.
- the ridges were lenticular lenses.
- the aspect ratio was 20%.
- the phases of the convex meanders were all the same.
- FIG. 12 shows the light emitting surface of the planar light emitting module of Comparative Example 4 observed.
- the scale in FIG. 12 was 0-8,000 nit. In the figure, the high luminance portion is dark and the low luminance portion is thin. The same applies hereinafter.
- FIG. 12 shows the light emitting surface in the vicinity of the side surface 21b (FIG. 5).
- the viewing angle Sb (FIG. 5) is 0 °. That is, the light emitting surface is viewed in plan.
- the lower part of FIG. 12 represents the light emitting surface in the vicinity of the side surface 21a (FIG. 5).
- the viewing angle Sa (FIG. 5) is 10 °. That is, the light emitting surface is viewed obliquely.
- FIG. 13 is a graph showing the light distribution of the planar light emitting module of Comparative Example 4.
- the distance F shown in FIG. 5 was set to 540 mm, similarly to the light distribution (FIG. 8) of Comparative Example 1 above.
- V variable angle direction
- unevenness was recognized in the curve representing the light distribution.
- the result shown in FIG. 13 is the same as the result shown in Comparative Example 1.
- Comparative Example 5 the following planar light emitting module was used in order to confirm whether or not only the irregular meandering of the groove has a glare reduction effect.
- the light guide of Comparative Example 5 includes a groove having a linear outline 19 as shown in FIG.
- the contour line 19 has a two-stage V-shape.
- such grooves meander like the grooves 25a-d shown in FIG.
- the meandering width M of the meandering groove (FIG. 6) was 80 ⁇ m
- the meandering pitch P of the groove (FIG. 6) was 1 mm.
- the meandering phases between the grooves were irregularly shifted from each other.
- FIG. 14 shows the light emitting surface of the surface light emitting module of Comparative Example 5 observed.
- the scale in FIG. 14 was 0-8,000 nit.
- the viewing angles in the upper and lower stages are the same as those in Comparative Example 4.
- hot spots, bright lines, dark lines, and glare were recognized in the vicinity of the side surfaces 21a and 21b (FIG. 5). The above results show that hot spots cannot be eliminated only by irregular meandering of the grooves.
- Comparative Example 6 the following planar light emitting module was used in order to confirm whether only the smoothly curved slope of the groove in the depth direction has a glare reduction effect.
- the planar light emitting module of Comparative Example 6 was the same as the planar light emitting module of Comparative Example 1 except for the following points.
- the light guide of Comparative Example 6 includes a groove having a curved contour line 29 as shown in FIG. In addition, such a groove does not meander and forms a linear shape parallel to the light receiving surface.
- FIG. 15 shows the light emitting surface of the surface light emitting module of Comparative Example 6 observed.
- the scale in FIG. 15 was 0-8,000 nit.
- the viewing angle Sb (FIG. 5) of the upper line of sight was 0 °.
- the lower viewing angle Sb was 20 °.
- FIG. 16 is a graph showing the light distribution of the planar light emitting module of Comparative Example 6.
- the distance F shown in FIG. 5 was 540 mm.
- the unit of luminous intensity is cd, which is a luminous intensity value per 1000 lm.
- U, V, and W In the bending directions U, V, and W (FIG. 5), some unevenness remained in the curve representing the light distribution.
- the groove has a curved contour line 29 as shown in FIG. 2, similarly to the groove provided in the planar light emitting module of Comparative Example 6.
- the groove was meandered under meandering conditions provided in the planar light emitting module of Comparative Example 5.
- the meandering width M of the meandering groove (FIG. 6) was 80 ⁇ m, and the meandering pitch P of the groove (FIG. 6) was 1 mm.
- the meandering phases between the grooves were irregularly shifted from each other.
- FIG. 17 shows the light emitting surface of the planar light emitting module of Example 1 observed.
- the scale in FIG. 17 was 0-8,000 nit.
- the viewing angles in the upper and lower stages of FIG. 17 are the same as in Comparative Example 4 (FIG. 12).
- hot spots, bright lines, dark lines, and glare were reduced in the vicinity of the light-receiving surface formed by the side surfaces 21a and b (FIG. 5).
- FIG. 18 is a graph showing the light distribution of the planar light emitting module of Example 1. Similar to the light distribution in Comparative Example 4 (FIG. 13), in Example 1, the distance F shown in FIG. 5 was set to 540 mm.
- the unit of luminous intensity is a luminous intensity value per 1000 lm in cd.
- Example 1 The effect produced by Example 1 will be explained using both the irregular meandering of the groove and the smooth curvature of the groove in the depth direction, using the results of Comparative Examples 5 and 6.
- Comparative Example 5 The result of Comparative Example 5 was that, as described above, the hot spots could not be eliminated only by irregular meandering of the grooves. This result shows that the glare reduction effect is insufficient only by irregular meandering of the groove.
- Comparative Example 6 was that the effect of eliminating the hot spot was limited only by the smooth curve of the groove in the depth direction. This result shows that the glare reduction effect is insufficient only by the smooth curve of the groove in the depth direction.
- Patent document 2 is disclosing the backlight assembly.
- a prism pattern is provided on the lower surface, and light incident on the light guide is totally reflected on the lower surface, and a part of the light is emitted from the upper surface with a reflection angle changed by the prism pattern.
- the prism pattern on the lower surface is formed with an irregular curve. This is to avoid the generation of moire due to geometric interference between the pixels of the liquid crystal panel and the pattern. Therefore, the moire generation avoidance method is different from the glare elimination principle described above. For this reason, in the comparative example of this application, it is thought that only an irregular curve was insufficient for suppression of glare.
- the planar light emitting module of Example 2 was provided with a groove equivalent to that of the planar light emitting module of Example 1.
- the meandering pitch P of the grooves (FIG. 6) was 1 mm.
- the planar light emitting module of Example 2 is different from the planar light emitting module of Example 1 in the following points.
- the meandering width M (FIG. 6) of the meandering groove was 140 ⁇ m.
- FIG. 19 is a plan view of the light emitting surface of the planar light emitting module of Example 2.
- the scale in FIG. 19 was 0-5,000 nit.
- the viewing angle Sb (FIG. 5) of the line of sight is 0 °.
- the scale was 0-5000 cd / m 2 .
- no hot spots, bright lines, dark lines, and glare were observed in the vicinity of the light receiving surface formed by the side surface 21b (FIG. 5).
- FIG. 20 is a graph showing the light distribution of the planar light emitting module of Example 2.
- the distance F shown in FIG. 5 was set to 540 mm.
- the curve representing the light distribution was not uneven. Hot spots, bright lines, dark lines, and glare disappeared due to the disappearance of the unevenness. In Example 2, glare could be effectively suppressed without depending on the diffusing material.
- Example 2 Compared with Example 1, in Example 2, the emitted light flux was wide-angle in both the variable angle direction U and the variable angle direction V (FIG. 5). For this reason, it was shown that the ratio of the meandering width M of the meandering pitch M to the meandering pitch P (M / P) is increased, so that the emitted light beam has a wide angle.
- the planar light emitting module of Example 3-4 is equivalent to the planar light emitting module of Example 2 except that the meandering width M of the meandering groove M (FIG. 6), that is, the amplitude is as shown in Table 1. did.
- Example 1-4 was compared with Comparative Examples 7 and 8.
- the planar light emitting module of Comparative Example 7 was made equivalent to the planar light emitting module of Example 2 except that the groove was equivalent to the groove of Comparative Example 1.
- the planar light emitting module of Comparative Example 8 was the same as the planar light emitting module of Comparative Example 7 except that the diffusion sheet used in Comparative Example 2 was attached to the light emitting surface.
- the emitted light beam (unit: lm) in Table 1 represents a value obtained by measuring the light beam emitted from the light emitting surface of the planar light emitting module with an integrating sphere.
- the half-value angle (unit: °) in Table 1 is that the normal direction of the light emitting surface of the planar light emitting module is 0 °, and the light emitting surface is observed while changing the light receiving angle with a light distribution distribution measuring device. When obtained, it represents the light receiving angle at which the luminous intensity at 0 ° is half the value.
- the half-value angle was calculated for each of the deflection directions U and V (FIG. 5).
- the hot spot levels in Table 1 represent the following values.
- the absolute value of the luminance difference between the luminance measured at the position facing the LED light source position and the luminance measured at the position facing the intermediate point of each adjacent LED light source is ⁇ L.
- Lave be the average value of the brightness measured at the position facing the LED light source position and the brightness measured at the position facing the intermediate point of each adjacent LED light source.
- ⁇ L / Lave (%) represents the hot spot level.
- the smaller the hot spot level the smaller the brightness unevenness. This indicates that the smaller the hot spot level is, the closer the brightness is to uniform.
- the direct illuminance (unit: lx) in Table 1 represents the illuminance at a point 2 m away from the normal direction of the light emitting surface of the planar light emitting module, with the normal direction being 0 °.
- the light distribution curve obtained in the variable angle direction U is a light distribution curve in a plane parallel to the light receiving surface.
- the half-value angle is preferably 45 ° or more.
- the illuminance directly below can be kept high. A wide range can be illuminated when the half-value angle is 60 ° or more.
- FIG. 21 shows an oblique view in which the viewing angle Sb (FIG. 5) is 20 °.
- the upper side in the figure is the side closer to the light source.
- the scale was 6500 cd / m 2 .
- FIG. 22 shows an oblique view in which the viewing angle Sb (FIG. 5) is 30 °.
- the scale was 4000 cd / m 2 .
- the lower side in the figure is the side closer to the light source.
- the meandering width M (FIG. 6) of the meandering groove of the planar light emitting module of Example 5 shown in the upper part of FIGS. 21 and 22 was set to 60 ⁇ m.
- the maximum value of the angle formed by the groove and the light receiving surface is 20.7 °.
- the meandering width M (FIG. 6) of the meandering groove of the planar light emitting module of Example 1 shown in the middle of FIGS. 21 and 22 was set to 80 ⁇ m.
- the maximum value of the angle formed by the groove and the light receiving surface is 26.7 °.
- the meandering width M (FIG. 6) of the meandering groove of the planar light emitting module of Example 6 shown in the lower part of FIGS. 21 and 22 was 150 ⁇ m.
- the maximum value of the angle formed by the groove and the light receiving surface is 43.3 °.
- the angle formed by the groove and the light receiving surface is represented as the angle formed by the groove and a line parallel to the light receiving surface on the deflection surface.
- the maximum value of such an angle is preferably 20.7 ° or more.
- the maximum value is more preferably at least one of 25 ° and 40 °.
- the ratio (M / P) of the meandering width M of the meandering to the meandering pitch P is preferably 0.06 or more. Such ratio is preferably equal to or greater than any of 0.08, 0.10, 0.14, 0.15, and 0.20. With such an embodiment, glare can be effectively suppressed.
- the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.
- the light guide 20 shown in FIG. The light receiving surface may be positioned not at the outer edge of the light guide 20 but at the center.
- an illumination device shown in FIG. 24 includes the planar light emitting module shown in FIG.
- the lower bottom surface 22 has a deflection pattern 46.
- the deflection pattern 46 includes a plurality of grooves substantially parallel to the side surface 21a. The plurality of grooves are arranged in order from the vicinity of the side surface 21a toward the far side.
- each of the grooves shown in FIG. 23 is preferably provided substantially parallel to the side surface 21a.
- the groove is preferably a substantially V-shaped groove.
- channel may be linear form and may meander.
- the interval between the plurality of grooves basically becomes narrower as the distance between each groove and the side surface 21a is larger. As a result, more light can be deflected and directed to the upper bottom surface 23 even in a place where the amount of light that reaches because of being far from the side surface 21a is reduced.
- channel shown in FIG. 23 may become large, so that the distance of each groove
- the interval between the grooves may be reduced stepwise as the distance from the side surface 21a increases.
- the interval can be changed in the range of 2.0 mm to 10 ⁇ m, for example.
- the number of grooves can be determined according to the size of the bottom surface, the depth of the grooves, and the distance between the grooves. The depth of each groove can be arbitrarily determined.
- the distance from the side surface 21a can be increased stepwise within a range of 2 to 100 ⁇ m.
- the upper bottom surface 23 has a fine pattern. In this aspect, it has the some protruding item
- the interval between the ridges 41 shown in FIG. 24 can be 0.05 to 2.0 mm.
- the interval is preferably 50 to 300 ⁇ m.
- the cross-sectional shape of the ridge 41 may be a substantial semicircle, a circular arc, an elliptical arc, a part of a parabola, or a trapezoid.
- a region in which the light source unit 45a and the deflection pattern 46 arranged near the end of the light guide 20 are provided (hereinafter may be referred to as a deflection pattern area 47). ) Between which the deflection pattern 46 is not provided.
- the exit light 36 does not exist in the region, so the non-light emitting portion 22b. It becomes.
- the deflection pattern 46 is present, the light 35 is deflected and emitted from the upper bottom surface 23 as outgoing light 36, so that the upper bottom surface 23 facing the deflection pattern area 47 becomes the light emitting portion 22 a.
- the cross section of the groove shown in FIG. 2 was assumed to be parallel to the YZ plane.
- the contour line 29 on the cross section is not necessarily orthogonal to the base line of the groove.
- the contour line may be perpendicular to the base line of the groove. That is, the contour line may always be defined along the tangential direction of the base line of the groove.
Abstract
Description
前記導光体は、
受光面を有する側面と、
偏向面を有する下底面と、
発光面を有する上底面と、
を有する板形状を成しており、
前記受光面は複数の前記光源と対向し、
前記光源は前記偏向面と平行な方向に所定の間隔で列をなし、
前記偏向面は互いに並行する複数の溝を有し、
前記溝は前記受光面の近傍から前記受光面の遠方に向かう方向に順に配置されるとともに、前記板形状を平面視した時、滑らかに蛇行しており、
前記複数の溝の間で前記蛇行の位相は互いに不規則にずれており、
前記受光面の法線と、前記板形状が拡がる基準平面の法線とに平行である断面において、前記溝の輪郭線の接線が前記基準平面に対して成す傾斜角は、前記溝の中での深さが大きくなるにつれて単調に小さくなるとともに、前記深さに応じて滑らかに変化する、
面状発光モジュール。
[2] 前記傾斜角は少なくとも25度から65度までの範囲で単調かつ滑らかに変化する、
[1]に記載の面状発光モジュール。
[3] 前記受光面と平行な面における配光曲線において半値角が45°以上である、
請求項1又は2に記載の面状発光モジュール。
[4] 前記半値角は60°以上である、
[3]に記載の面状発光モジュール。
[5] 前記蛇行のピッチに対する前記蛇行の蛇行幅の比は0.06以上である、
[1]~[4]のいずれかに記載の面状発光モジュール。
[6] 前記蛇行において、前記溝と前記受光面とが成す角度の最大値は20.7°以上である、
[1]~[5]のいずれかに記載の面状発光モジュール。
[7] 前記発光面は互いに並行する凸条を有し、
前記凸条は前記受光面に対して直角である、
[1]~[6]のいずれかに記載の面状発光モジュール。
[8] 前記輪郭線がV字形状であり、
前記V字形状の中心線が前記基準平面に対して直角である、
[1]~[7]のいずれかに記載の面状発光モジュール。
[9] [1]~[8]のいずれかに記載の面状発光モジュールを備えるが、
前記発光面に対向する拡散材を備えない、
照明装置。
[10] [1]~[8]のいずれかに記載の面状発光モジュールを備えるが、
前記偏向面に対して対向する非鏡面を有する反射材を備えない、
照明装置。
以下の実施例及び比較例では、上底面23の成す発光面上には、アスペクト比20%のレンチキュラーレンズが設けられている。レンチキュラーレンズの高さは12.5μm、幅は50μm、ピッチは50μmである。
図9は面状発光モジュールを拡散板越しに観察したものである。比較例1のものと同一の面状発光モジュールの発光面に、図4に示す拡散材43と同等の拡散材として拡散板を取り付けた。拡散板の補正は0.691であった。図9のスケール(Scale)は0-6,000 nitであった。
上記実施の形態の変更例として、例えば、図24に示す照明装置が挙げられる。図24に示す照明装置は、図23に示す面状発光モジュールを備える。
図23に示すように下底面22は偏向パターン46を有する。偏向パターン46は側面21aに略平行な複数の溝からなる。前記複数の溝は、側面21aの近くから遠くに向かって順に並ぶ。
また、上記各溝は直線状であっても良いし、蛇行していてもよい。
複数の溝相互の間隔は、各溝と側面21aとの距離が大きいほど、基本的には狭くなる。これにより、側面21aから遠いために到達する光が少なくなる場所でも、より多くの光を偏向し、上底面23に向けることができる。
各溝の深さは、任意に決定することができる。一例として側面21aから遠ざかるにつれて、2~100μmの範囲で段階的に大きくすることができる。
図24に示すように、上底面23は微細パターンを備える。この態様においては、互いに平行に延びる複数の凸条41を有する。図23及び図24に示すように、導光体20を平面視すると、凸条41は側面21aと垂直に配置されており、下底面22に配された各溝と直交する。
凸条41の断面形状は、実質的な半円、円弧、楕円の弧、放物線の一部、台形でもよい。
上底面23に設けられる凸条41の断面形状を適宜選択することで、出射光の出射方向を所望の方向および範囲に制御することができる。
Claims (10)
- 導光体と光源とを備え、
前記導光体は、
受光面を有する側面と、
偏向面を有する下底面と、
発光面を有する上底面と、
を有する板形状を成しており、
前記受光面は複数の前記光源と対向し、
前記光源は前記偏向面と平行な方向に所定の間隔で列をなし、
前記偏向面は互いに並行する複数の溝を有し、
前記溝は前記受光面の近傍から前記受光面の遠方に向かう方向に順に配置されるとともに、前記板形状を平面視した時、滑らかに蛇行しており、
前記複数の溝の間で前記蛇行の位相は互いに不規則にずれており、
前記受光面の法線と、前記板形状が拡がる基準平面の法線とに平行である断面において、前記溝の輪郭線の接線が前記基準平面に対して成す傾斜角は、前記溝の中での深さが大きくなるにつれて単調に小さくなるとともに、前記深さに応じて滑らかに変化する、
面状発光モジュール。 - 前記傾斜角は少なくとも25度から65度までの範囲で単調かつ滑らかに変化する、
請求項1に記載の面状発光モジュール。 - 前記受光面と平行な面における配光曲線において半値角が45°以上である、
請求項1又は2に記載の面状発光モジュール。 - 前記半値角は60°以上である、
請求項3に記載の面状発光モジュール。 - 前記蛇行のピッチに対する前記蛇行の蛇行幅の比は0.06以上である、
請求項1~4のいずれかに記載の面状発光モジュール。 - 前記蛇行において、前記溝と前記受光面とが成す角度の最大値は20.7°以上である、
請求項1~5のいずれかに記載の面状発光モジュール。 - 前記発光面は互いに並行する凸条を有し、
前記凸条は前記受光面に対して直角である、
請求項1~6のいずれかに記載の面状発光モジュール。 - 前記輪郭線がV字形状であり、
前記V字形状の中心線が前記基準平面に対して直角である、
請求項1~7のいずれかに記載の面状発光モジュール。 - 請求項1~8のいずれかに記載の面状発光モジュールを備えるが、
前記発光面に対向する拡散材を備えない、
照明装置。 - 請求項1~8のいずれかに記載の面状発光モジュールを備えるが、
前記偏向面に対して対向する非鏡面を有する反射材を備えない、
照明装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020187026975A KR20180117643A (ko) | 2016-03-07 | 2017-03-06 | 면상 발광 모듈 및 조명 장치 |
CN201780015743.8A CN108713123A (zh) | 2016-03-07 | 2017-03-06 | 面状发光模块和照明装置 |
JP2018504476A JPWO2017154841A1 (ja) | 2016-03-07 | 2017-03-06 | 面状発光モジュール及び照明装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016-043149 | 2016-03-07 | ||
JP2016043149 | 2016-03-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017154841A1 true WO2017154841A1 (ja) | 2017-09-14 |
Family
ID=59789281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2017/008811 WO2017154841A1 (ja) | 2016-03-07 | 2017-03-06 | 面状発光モジュール及び照明装置 |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPWO2017154841A1 (ja) |
KR (1) | KR20180117643A (ja) |
CN (1) | CN108713123A (ja) |
TW (1) | TW201802391A (ja) |
WO (1) | WO2017154841A1 (ja) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002203416A (ja) * | 2000-10-26 | 2002-07-19 | Minebea Co Ltd | 面状照明装置 |
JP2006235111A (ja) * | 2005-02-23 | 2006-09-07 | General Electric Co <Ge> | 変調された構造体を有する光学基板 |
JP2009298093A (ja) * | 2008-06-17 | 2009-12-24 | Toray Ind Inc | 金型、インプリント成形品および面光源 |
JP2012009216A (ja) * | 2010-06-23 | 2012-01-12 | Minebea Co Ltd | 面状照明装置 |
WO2014181865A1 (ja) * | 2013-05-10 | 2014-11-13 | 株式会社クラレ | 照明装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5211506B2 (ja) * | 2007-02-21 | 2013-06-12 | 王子ホールディングス株式会社 | 凹凸パターン形成シートならびにその製造方法、反射防止体、位相差板および光学素子製造用工程シート。 |
JP4475312B2 (ja) * | 2007-10-01 | 2010-06-09 | エプソンイメージングデバイス株式会社 | 液晶表示装置及び電子機器 |
-
2017
- 2017-03-06 JP JP2018504476A patent/JPWO2017154841A1/ja active Pending
- 2017-03-06 KR KR1020187026975A patent/KR20180117643A/ko not_active Application Discontinuation
- 2017-03-06 WO PCT/JP2017/008811 patent/WO2017154841A1/ja active Application Filing
- 2017-03-06 CN CN201780015743.8A patent/CN108713123A/zh active Pending
- 2017-03-07 TW TW106107323A patent/TW201802391A/zh unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002203416A (ja) * | 2000-10-26 | 2002-07-19 | Minebea Co Ltd | 面状照明装置 |
JP2006235111A (ja) * | 2005-02-23 | 2006-09-07 | General Electric Co <Ge> | 変調された構造体を有する光学基板 |
JP2009298093A (ja) * | 2008-06-17 | 2009-12-24 | Toray Ind Inc | 金型、インプリント成形品および面光源 |
JP2012009216A (ja) * | 2010-06-23 | 2012-01-12 | Minebea Co Ltd | 面状照明装置 |
WO2014181865A1 (ja) * | 2013-05-10 | 2014-11-13 | 株式会社クラレ | 照明装置 |
Also Published As
Publication number | Publication date |
---|---|
TW201802391A (zh) | 2018-01-16 |
KR20180117643A (ko) | 2018-10-29 |
JPWO2017154841A1 (ja) | 2018-12-27 |
CN108713123A (zh) | 2018-10-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9766391B2 (en) | Light guide plate and light source module | |
US9778405B2 (en) | Light guide plate and light source module | |
JP2010205713A (ja) | 照明装置及びこれを用いた表示装置 | |
US6786613B2 (en) | Spread illuminating apparatus | |
JP4485999B2 (ja) | 面光源装置 | |
TW201307920A (zh) | 導光板及面光源裝置 | |
JP5766044B2 (ja) | 光束制御部材、この光束制御部材を備えた発光装置およびこの発光装置を備えた面光源装置 | |
JP4515374B2 (ja) | 照明装置及びそれを用いた表示装置 | |
US20160238777A1 (en) | Light guide plate ,light source module and display device | |
US9194559B2 (en) | Illumination lens and illumination module | |
US20070291510A1 (en) | Backlight module and light guide plate thereof | |
TWI605224B (zh) | 照明裝置 | |
JP2015041439A (ja) | 照明装置およびそれを備えた表示装置 | |
US8439548B2 (en) | Symmetric serrated edge light guide having circular base segments | |
US8491172B2 (en) | Symmetric serrated edge light guide film having elliptical base segments | |
US8031405B2 (en) | Optical adjusting apparatus with composite pattern structure | |
CN112965161A (zh) | 一种导光板及其网点布点方法 | |
JP6238250B2 (ja) | 照明装置 | |
JP2010044921A (ja) | 面光源素子並びにこれに用いる光制御部材及びこれを用いた画像表示装置 | |
WO2017154841A1 (ja) | 面状発光モジュール及び照明装置 | |
KR20130133569A (ko) | 백라이트 유닛 및 이를 포함하는 액정 표시 장치 | |
WO2018186413A1 (ja) | 導光体、及び面状発光モジュール | |
JP6751452B2 (ja) | 面状照明装置 | |
US8858058B2 (en) | Asymmetric serrated edge light guide film having circular base segments | |
US11947154B2 (en) | Luminaire and lighting system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 2018504476 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 20187026975 Country of ref document: KR Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 17763181 Country of ref document: EP Kind code of ref document: A1 |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 17763181 Country of ref document: EP Kind code of ref document: A1 |