WO2017077617A1 - Élément optique - Google Patents

Élément optique Download PDF

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Publication number
WO2017077617A1
WO2017077617A1 PCT/JP2015/081138 JP2015081138W WO2017077617A1 WO 2017077617 A1 WO2017077617 A1 WO 2017077617A1 JP 2015081138 W JP2015081138 W JP 2015081138W WO 2017077617 A1 WO2017077617 A1 WO 2017077617A1
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WO
WIPO (PCT)
Prior art keywords
light
optical element
optical axis
point
light source
Prior art date
Application number
PCT/JP2015/081138
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English (en)
Japanese (ja)
Inventor
達矢 山口
賢元 池田
智仁 桑垣内
大介 関
Original Assignee
ナルックス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by ナルックス株式会社 filed Critical ナルックス株式会社
Priority to PCT/JP2015/081138 priority Critical patent/WO2017077617A1/fr
Publication of WO2017077617A1 publication Critical patent/WO2017077617A1/fr

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    • 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
    • F21V5/00—Refractors for light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses

Definitions

  • the present invention relates to an optical element for controlling the direction of light emitted from a light source.
  • the light emitted from the light emitting surface of the LED follows a Lambertian light distribution, so that the position directly above the LED, that is, the surface to be irradiated of the LED The light intensity at the projection position increases.
  • emitted from the light emitting element with the light emitting element is used.
  • Patent Document 1 discloses an optical element that reflects reflected light from the exit surface toward the bottom surface in the outer circumferential direction by a recess provided on the bottom surface.
  • the concave portion on the bottom surface is a textured surface, the reflected light from the exit surface cannot be positively reflected in the lens outer peripheral direction.
  • the surface to be irradiated is specifically affected by scattering at the gate mark. May produce bright or dark spots.
  • the optical element among the light beams traveling from the side surface to the outer periphery, there are light beams emitted in a direction substantially parallel to the optical axis. These rays can interfere with rays from adjacent lenses, resulting in specific bright or dark spots on the illuminated surface above the location of the lens.
  • Patent Document 2 discloses an optical element that reflects light that is totally reflected on an exit surface and travels toward the bottom surface to a surface to be irradiated by a reflective layer provided on the bottom surface.
  • the illuminance distribution on the irradiated surface can be appropriately adjusted by the characteristics of the reflective layer.
  • the material cost and the man-hour cost increase by providing the optical element with the reflective layer.
  • JP 2014-102485 A Japanese Unexamined Patent Publication No. 2011-3459 (Japanese Patent No. 542938)
  • the technical problem of the present invention is to provide an optical element having a simple structure that can simultaneously realize both wide light distribution and uniform illuminance on an irradiated surface.
  • An optical element includes a bottom surface, an entrance surface having an opening on the bottom surface and formed to cover the light source, and an exit surface that covers the entrance surface, and the light from the light source is An optical element configured to be irradiated outside after passing through the incident surface and the exit surface.
  • the bottom surface includes a leg portion to which the optical element is attached, and at least a part of the leg portion is composed of a light absorbing member or at least a part is covered with the light absorbing member.
  • the light beam that is emitted from the light source passes through the incident surface, is reflected by the exit surface, reaches the bottom surface, and is further reflected by the bottom surface or the mounting substrate to reach the irradiated surface. It can be reduced by being absorbed by the light absorbing member provided on the bottom leg. Therefore, both wide light distribution and uniform illuminance on the irradiated surface can be realized simultaneously.
  • the optical element according to the first embodiment of the present invention is radiated from the light source within a cross section including the optical axis, with the center of the light source and a straight line passing through the center of the optical element as the optical axis, Of the light beams traveling through the incident surface, reflected by the light exit surface, and reaching the bottom surface so that the leg portion is disposed at a position including the position of the bottom surface where the illuminance is maximum. It is configured.
  • the illuminance on the irradiated surface can be made more uniform.
  • the optical element according to the second embodiment of the present invention is a light beam that is emitted from the light source and travels in the cross section, passes through the incident surface, is reflected by the exit surface, and reaches the bottom surface.
  • the leg portion is arranged at a position including the bottom region where the illuminance is 70% or more of the maximum value.
  • a larger part of the light beam emitted from the light source, passing through the incident surface, reflected by the exit surface, and reaching the bottom surface is absorbed by the light absorbing member provided on the bottom surface of the bottom surface.
  • light rays that are reflected toward the mounting substrate and reach the irradiated surface can be reduced. Therefore, the illuminance on the irradiated surface can be made more uniform.
  • An acute angle formed by a light ray radiated from the upper point and traveling in the cross section with the optical axis is represented by ⁇ 0, and a straight line passing through the point and perpendicular to the optical axis is the point where the light ray intersects the incident surface.
  • ⁇ tan When the acute angle formed with the incident surface is represented by ⁇ tan, ⁇ tan increases monotonously as ⁇ 0 increases in the range of 0 0 to 5 degrees, and ⁇ tan is 25 degrees or more when ⁇ 0 is 5 degrees.
  • the incident surface is configured.
  • the light beam is radiated so that the acute angle formed by the path after passing through the incident surface of the light beam emitted from the point on the optical axis on the light emitting surface of the light source and the optical axis is sufficiently large. It can be refracted by the entrance surface.
  • An acute angle formed by a light ray radiated from the upper point and traveling in the cross section with the optical axis is represented by ⁇ 0
  • a straight line passing through the point and perpendicular to the optical axis is the point where the light ray intersects the incident surface.
  • ⁇ tan When an acute angle with the incident surface is represented by ⁇ tan, ⁇ tan increases monotonously as ⁇ 0 increases in the range of 0 to 15 degrees, and ⁇ tan is 50 degrees or more when ⁇ 0 is 15 degrees.
  • the incident surface is configured.
  • the light beam is radiated so that the acute angle formed by the path after passing through the incident surface of the light beam emitted from the point on the optical axis on the light emitting surface of the light source and the optical axis is sufficiently large. It can be refracted by the entrance surface.
  • the acute angle formed by the light beam emitted from the upper point and traveling in the cross section with the optical axis is represented by ⁇ 0
  • the incident angle when the light beam reaches the exit surface after passing through the incident surface is represented by ⁇ in.
  • D1 represents the distance from the central axis of the point where the light beam reached the exit surface
  • ⁇ out represents the acute angle formed with the central axis after the light beam is reflected by the exit surface.
  • the light beam when ⁇ 0 is greater than 15 degrees and D2 is equal to or greater than D1, the light beam emitted from a point on the optical axis on the light emitting surface of the light source and refracted by the incident surface.
  • the light beam can be refracted by the exit surface and not totally reflected by the exit surface so that the acute angle formed by the path after passing through the exit surface and the optical axis is further increased.
  • the entrance surface and the exit surface are configured to be axisymmetric with respect to the optical axis, and are formed on at least a part of the annular region surrounding the central axis of the bottom surface.
  • the light-absorbing member is arranged at the corresponding part.
  • the illuminance distribution on the irradiated surface can be changed by changing the area of the annular region in which the light absorbing member is disposed.
  • the entrance surface and the exit surface are configured to be axisymmetric with respect to the optical axis, and the distance between the bottom surface and the central axis is Ra and the center
  • the leg portion is arranged at a portion corresponding to at least a part of the annular region surrounded by a circle of Rb from the axis.
  • the illuminance distribution on the irradiated surface can be changed by changing the region in which the legs are arranged in the annular region.
  • the leg portion is made of a black resin as the light absorbing member.
  • the leg is covered with the black paint which is the light absorbing member.
  • the leg portion is configured to be attached to the surface by the black adhesive resin as the light absorbing member.
  • FIG. 1 is a diagram for explaining the shape of an optical element 100 according to an embodiment of the present invention.
  • the optical element 100 includes an incident surface 101 that covers the light source 200, an emission surface 103 that covers the incident surface 101, a bottom surface 107 that is continuous with the incident surface 101, and a side surface 105 between the emission surface 103 and the bottom surface.
  • the incident surface 101 is formed as a concave surface having an opening on the bottom surface 107.
  • the optical element 100 is used for realizing a wide light distribution by refracting light from the light source 200 by the incident surface 101 and the exit surface 103 and irradiating a wide range.
  • the optical element 100 has a central axis OP, and FIG. 1 is a cross-sectional view including the central axis OP.
  • the optical element 100 has a shape obtained by rotating the shape shown in FIG. 1 around the central axis OP.
  • the light source that is, the light emitting element 200 is arranged so that the center is located on the central axis OP.
  • the intersection of the central axis OP and the light emitting surface of the light emitting element 200 is P0.
  • the central axis OP is the optical axis.
  • the optical axis OP and the plane including the bottom surface 107 are orthogonal. In the cross section shown in FIG. 1, the direction of the bottom surface 107 is the x-axis direction, and the direction of the optical axis OP is the z-axis direction.
  • Intersections of the optical axis OP with the incident surface 101 and the exit surface 103 are defined as O1 and O2, respectively.
  • the core thickness (the distance between the points O1 and O2 in FIG. 1) of the optical element (lens) 100 is 0.6 mm.
  • the intersections of the light incident surface 101, the exit surface 103, and the bottom surface 107 are P1, P2, and P3, respectively.
  • An angle (acute angle) formed between the tangent line at the point P1 of the incident surface 101 and the x-axis direction is defined as ⁇ tan.
  • An angle (acute angle) formed by a normal line at the point P2 on the exit surface 103 and a line segment connecting P1 and P2 is defined as ⁇ in.
  • the angle (acute angle) formed by the line segment connecting P2 and P3 and the z-axis direction is defined as ⁇ out.
  • the distance of the point P2 from the optical axis OP is D1
  • the distance of the point P3 from the optical axis OP is D2.
  • the entrance surface 101 and the exit surface 103 can be expressed by the following equations.
  • r represents a distance from the optical axis OP.
  • c is the curvature
  • R is the radius of curvature
  • k is the conic coefficient
  • Is the aspheric coefficient.
  • i and n represent integers.
  • Z represents the coordinate in the z-axis direction with respect to the point O1.
  • the opposite side of the point P0 is positive.
  • the incident surface 101 has a shape obtained by rotating the curve represented by the formula (1) around the optical axis OP.
  • Table 1 is a table showing numerical data of the formula (1) representing the incident surface 101.
  • the maximum value of r on the incident surface 101 is 1.4 mm.
  • Z represents the coordinate in the z-axis direction with respect to the point O2. With respect to the point O2, the opposite side of the point P0 is positive.
  • the exit surface 103 has a shape obtained by rotating the curve represented by the formula (1) around the optical axis OP.
  • Table 2 is a table showing numerical data of the formula (1) representing the emission surface 103.
  • the maximum value of r on the exit surface 103 is 6.8 mm.
  • the material of the optical element 100 is PMMA (polymethyl methacrylate), and the refractive index is 1.492 (d line, 587.56 mm).
  • FIG. 2 is a diagram showing the relationship between the angle ⁇ 0 and the angle ⁇ tan.
  • the horizontal axis represents the angle ⁇ 0
  • the vertical axis represents the angle ⁇ tan.
  • FIG. 3 is a diagram illustrating the relationship between the angle ⁇ 0 and the angle ⁇ in.
  • the horizontal axis represents the angle ⁇ 0
  • the vertical axis represents the angle ⁇ in.
  • ⁇ 0 increases rapidly and reaches a maximum value of 40 degrees when ⁇ 0 is 13 degrees.
  • ⁇ 0 is in the range of 3 to 51 degrees and ⁇ in is 30 degrees or more
  • the light emitted from the light emitting element 200 and refracted by the incident surface 101 passes through the exit surface 103.
  • the light beam can be refracted by the exit surface 103 so that the acute angle formed by the path and the optical axis is further increased.
  • n is the refractive index of the optical element 100, and the value on the right side of the above formula is 42.1 degrees. Therefore, the optical element 100 of the present embodiment satisfies the above formula.
  • FIG. 4 is a diagram showing the relationship between the angle ⁇ 0 and D2-D1.
  • the horizontal axis represents the angle ⁇ 0
  • the vertical axis represents D2-D1.
  • D2-D1 is negative for light rays emitted from the point P0 of the light emitting element 200, passing through the point P1 of the incident surface 101, and incident on the peripheral edge of the side surface 105 of the exit surface 103.
  • D2-D1 is negative in a region where the angle ⁇ 0 is greater than 51 degrees.
  • ⁇ 0 is 3 degrees or more
  • ⁇ in is 30 degrees or more in a non-negative region of D2-D1
  • the light is emitted from the light emitting element 200 and incident surface 101
  • the light beam can be refracted by the exit surface 103 so that the acute angle between the optical axis and the path after the light beam refracted by the light beam passes through the exit surface 103.
  • the exit surface is formed.
  • the light rays reflected by 103 and reaching the bottom surface 107 increase.
  • the arrival point at the bottom surface 107 of the light beam reflected by the exit surface 103 and reaching the bottom surface 107 is indicated by P3.
  • FIG. 5 is a diagram showing a state in which the optical element 100 of the present embodiment is used.
  • the shape of the optical element 100 is the same as that shown in FIG. 1, and the reference numerals used in FIG. 5 are the same as those used in FIG.
  • the light emitted from the light emitting element 200 fixed to the surface of the substrate 250 reaches the emission surface 103 after passing through the incident surface 101. Part of the light that has reached the exit surface 103 is refracted by the exit surface 103 and travels toward the irradiated surface 300 as refracted light Fr. Another part of the light reaching the exit surface 103 is reflected by the exit surface 103 and travels toward the bottom surface 107 as reflected light Fl.
  • the light emitting element 200 of the present embodiment is a light emitting diode (LED) element, and the diameter of the light emitting surface is 2.1 mm.
  • the light emitting surface is arranged in parallel with the bottom surface 107.
  • the distance between the light emitting surface and the bottom surface 107 in the optical axis direction, that is, the z-axis direction is 0.1 mm.
  • the total luminous flux emitted from the light emitting surface of the light emitting element 200 is 100 lumens.
  • Light emitted from the light emitting surface follows Lambert light distribution. That is, when the angle between the direction perpendicular to the light emitting surface and the traveling direction of the light emitted from the light emitting surface is ⁇ , the luminous intensity distribution is proportional to cos ⁇ .
  • FIG. 6 is a diagram showing the relationship between the distance of the point on the bottom surface 107 from the optical axis OP and the illuminance at the point by the light beam reflected by the exit surface 103 and reaching the bottom surface 107.
  • the illuminance of the bottom surface 107 shows a maximum value at a point where the distance from the optical axis is 5.9 mm.
  • the illuminance of the bottom surface 107 shows a value of 70% or more of the maximum value in the region where the distance from the optical axis is 5.4 mm to 6.2 mm, and the distance from the optical axis is in the range of 5.5 mm to 6.1 mm. In the region, the value of 75% or more of the maximum value is shown, and in the region where the distance from the optical axis is in the range of 5.6 mm to 6.1 mm, the value of 80% or more of the maximum value is shown.
  • the light beam that has reached the bottom surface 107 in this way undergoes multiple reflections in the optical element 100 and increases the illuminance at the position directly above the light emitting element 200, that is, the projection position on the irradiated surface of the light emitting element 200. Therefore, in the prior art, when the entrance surface and the exit surface are formed so as to realize a wide distribution of light rays from the light emitting element, the illuminance at the position directly above the light emitting element becomes excessively large, thereby realizing uniform illuminance. It was an obstacle.
  • the present invention prevents multiple reflections in the optical element 100 and prevents an increase in illuminance immediately above the light emitting element 200 by a leg portion that is at least partially composed of the light absorbing member or covered by the light absorbing member. To do.
  • the leg 109 of the optical element 100 is provided at a position where the reflected light Fl reaches the bottom 107.
  • the adhesive 150 that fixes the leg 109 to the substrate 250 is a light absorbing member.
  • at least a part of the leg 109 is made of a light absorbing member or at least part of the leg 109 is covered with the light absorbing member so that the reflected light reaching the bottom 107 is not further reflected.
  • the method of providing a light absorbing member around or around the leg include a method using a black adhesive resin, a method of coloring the outer periphery of the leg with a black paint, and a method of molding the leg with a black resin.
  • a black adhesive resin for example, an acrylic element, silicone resin, or epoxy resin adhesive mixed with a black pigment such as carbon black, graphite, iron black, etc.
  • 100 legs 109 are used to fix the substrate 250.
  • the black paint containing the black pigment described above is applied to the leg surface to form a film having a light transmittance of 10% or less in the visible light region.
  • the black leg portion is molded by adding the above-described black pigment in addition to a resin that is substantially transparent in the visible light region as a raw material during molding.
  • the first is a method in which the legs are molded with a black resin and the main body of the optical element is molded with a transparent resin by two-color molding.
  • the second is a method in which the leg portion is molded with a black resin, and the body of the optical element is molded with a transparent resin on the leg portion by insert molding.
  • the third method is a method in which the leg portion is molded with a black resin, the main body of the optical element is molded with a transparent resin, and both are integrated by ultrasonic welding.
  • the method for attaching the optical element to the substrate will be described.
  • An adhesive is applied in advance to a position where the leg portion on the substrate is fixed.
  • a device called a mounter accurately determines the position of the optical element and the position of the substrate through image recognition, aligns the lens leg to the fixed leg position on the substrate, and places the optical element on the substrate. Adhere by pressing against adhesive.
  • FIG. 7 is a view for explaining the arrangement of the leg portions and the light absorbing members.
  • FIG. 7A is a view showing a cross section including the optical axis OP
  • FIG. 7B is a view showing a cross section perpendicular to the optical axis OP.
  • the leg 109 is disposed on the bottom surface 107 in an annular region between the circle having the radius Ra and the circle having the radius Rb with the optical axis OP as the center.
  • the bottom surface of the leg 109 is provided with a light absorbing member 150 that is an adhesive.
  • the light absorption efficiency of the light absorbing member 150 is 96%.
  • FIG. 8 is a diagram for explaining the effect of the light absorbing member.
  • FIG. 8A is a diagram showing the arrangement of the adhesive 150 that is a light absorbing member.
  • FIG. 8A is a diagram showing the arrangement of the adhesive 150 that is a light absorbing member.
  • FIG. 8A is a cross-sectional view including the optical axis of the optical element. The legs of the optical element are arranged on the bottom surface in a region between a circle having a radius Ra of 5.4
  • FIG. 8B is a diagram showing the illuminance distribution on the irradiated surface 300 of FIG.
  • the horizontal axis in FIG. 8B indicates the distance from the optical axis of a point on the irradiated surface 300.
  • the unit of distance is millimeters.
  • shaft of FIG.8 (b) shows the illumination intensity in the point.
  • the unit of illuminance is looks.
  • the solid line in FIG. 8B shows the case where there is a light absorbing member, and the dotted line in FIG. 8B shows the case where there is no light absorbing member. In either case, the illuminance is maximum at a point on the optical axis.
  • FIG. 8C is a diagram showing a distribution of standard values of illuminance on the irradiated surface 300 of FIG.
  • the standard value is a value normalized by the maximum value of illuminance.
  • the horizontal axis in FIG. 8C indicates the distance from the optical axis of a point on the irradiated surface 300. The unit of distance is millimeters.
  • shaft of FIG.8 (c) shows the standard value of the illumination intensity in the point.
  • the solid line in FIG. 8C shows the case where the light absorbing member is present, and the dotted line in FIG.
  • the standard value of illuminance when there is a light-absorbing member is larger than the standard value of illuminance when there is no light-absorbing member in the entire range except the point on the optical axis that indicates the maximum value of illuminance that is the standard value. Therefore, the illuminance distribution when there is a light-absorbing member is uniform because the illuminance at the position directly above the light-emitting element, that is, the projection position on the irradiated surface of the light-emitting element is suppressed, and the illuminance at other parts is relatively increased. It is preferable for realizing high illuminance.
  • FIG. 9 is a diagram for explaining the relationship between the position of the leg 109 on the bottom surface 107 and the ratio of the leg area to the bottom area and the ratio of the light beam reaching the leg to the light beam reaching the bottom surface.
  • FIG. 9A is a diagram showing the relationship between the position of the leg 109 on the bottom surface 107 and the ratio of the leg area to the bottom area.
  • FIG. 9A is a diagram showing the relationship between the position of the leg 109 on the bottom surface 107 and the ratio of the leg area to the bottom area.
  • FIG. 9B is a diagram illustrating the relationship between the position of the leg 109 on the bottom surface 107 and the ratio of the light beam reaching the leg portion to the light beam reaching the bottom surface.
  • the ratio of the luminous flux reaching the leg is 2%.
  • the ratio of the luminous flux reaching the leg is 23%.
  • the ratio of the light beam reaching the leg is 56%.
  • the legs may be installed in the region including the peak illuminance position on the bottom surface as described above. Furthermore, it is more preferable to arrange the legs so that (Ra, Rb) includes a region where the illuminance on the bottom surface shows a value of 70% or more of the maximum value.
  • FIG. 10 is a diagram for explaining the relationship between the position of the leg 109 on the bottom surface 107, the maximum illuminance, and the light extraction efficiency.
  • FIG. 10A is a diagram showing the relationship between the position of the leg 109 on the bottom surface 107 and the maximum (peak) illuminance.
  • the value of the maximum illuminance is expressed as a ratio (%) based on the value of the maximum illuminance when there is no light absorbing member.
  • FIG. 10B is a diagram showing the relationship between the position of the leg 109 on the bottom surface 107 and the light extraction efficiency.
  • the light extraction efficiency is the ratio of the luminous flux reaching the irradiated surface to the luminous flux emitted from the light source.
  • FIG. 11 is a diagram for explaining the relationship between the arrangement of the legs 109 on the bottom surface 107 and the maximum illuminance (peak illuminance).
  • FIG. 11A is a diagram for explaining the arrangement of the leg portions 109 on the bottom surface 107.
  • the leg portion 109 is disposed in two opposing regions having a predetermined angle ⁇ ring around the optical axis.
  • FIG. 11B is a diagram for explaining the relationship between the arrangement of the legs 109 and the maximum illuminance.
  • FIG. 12 is a diagram showing a path of a light beam having ⁇ 0 of 0 degree to 51 degrees among light rays emitted from the intersection of the optical axis and the light emitting surface of the light emitting element in the cross section of the optical element including the optical axis.
  • Light rays in the vicinity of the optical axis are largely refracted outwardly at the entrance surface and the main exit surface. Further, most of the light rays reflected by the Fresnel at the exit surface reach the legs and are absorbed by the light absorbing member, so that they are not further reflected and reach the irradiated surface.
  • the path of the light beam reflected by the bottom surface of the optical element is omitted to avoid complication.
  • the light emitting element has a single light emitting surface perpendicular to the optical axis.
  • the light emitting element may include a plurality of light emitting surfaces parallel to the optical axis or other light emitting surfaces.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention vise à fournir un élément optique qui présente une structure simple et qui permet d'obtenir simultanément une large distribution de lumière et un éclairage uniforme sur une surface éclairée. Cet élément optique présente une surface inférieure (107), une surface d'entrée (101) comprenant une section ouverte sur la surface inférieure et formée de manière à recouvrir une source de lumière, et une surface de sortie (103) qui recouvre la surface d'entrée, et est configuré de sorte que la lumière provenant de la source de lumière rayonne vers l'extérieur après avoir traversé la surface d'entrée et la surface de sortie. La surface inférieure est dotée de sections de pied (109) permettant de fixer l'élément optique, et au moins une partie de la section de pied est composée d'un élément absorbant la lumière, ou au moins une partie est recouverte par l'élément absorbant la lumière (150).
PCT/JP2015/081138 2015-11-05 2015-11-05 Élément optique WO2017077617A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013051437A1 (fr) * 2011-10-03 2013-04-11 シャープ株式会社 Dispositif d'éclairage, écran et dispositif de réception de télévision
JP5283101B1 (ja) * 2012-05-03 2013-09-04 ナルックス株式会社 光学素子

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013051437A1 (fr) * 2011-10-03 2013-04-11 シャープ株式会社 Dispositif d'éclairage, écran et dispositif de réception de télévision
JP5283101B1 (ja) * 2012-05-03 2013-09-04 ナルックス株式会社 光学素子

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