WO2017217303A1 - Élément de commande de distribution de lumière et dispositif d'éclairage. - Google Patents

Élément de commande de distribution de lumière et dispositif d'éclairage. Download PDF

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Publication number
WO2017217303A1
WO2017217303A1 PCT/JP2017/021208 JP2017021208W WO2017217303A1 WO 2017217303 A1 WO2017217303 A1 WO 2017217303A1 JP 2017021208 W JP2017021208 W JP 2017021208W WO 2017217303 A1 WO2017217303 A1 WO 2017217303A1
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WO
WIPO (PCT)
Prior art keywords
light distribution
control member
light
distribution control
prism
Prior art date
Application number
PCT/JP2017/021208
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English (en)
Japanese (ja)
Inventor
怜史 島岡
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ミネベアミツミ株式会社
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Application filed by ミネベアミツミ株式会社 filed Critical ミネベアミツミ株式会社
Publication of WO2017217303A1 publication Critical patent/WO2017217303A1/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
    • F21V5/02—Refractors for light sources of prismatic shape
    • 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
    • F21V5/04—Refractors for light sources of lens shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements

Definitions

  • the present invention relates to a light distribution control member and a lighting device.
  • the lighting device is light distribution controlled by a light distribution control member such as a lens.
  • a light distribution control member for obtaining illumination light broad in a specific direction
  • a lens in which a plurality of linear protrusion-shaped projections and recesses having a circular arc shape extending in parallel to each other in a specific direction are formed. Members are known.
  • the light diffusibility is relatively high at both ends of the R shape (arc shape), but the light diffusibility is low at the ends other than the both ends of the R shape. For this reason, for example, if a light distribution curve indicating the characteristics of the illuminance angle distribution with 0 degrees as the center is represented by orthogonal coordinates, the light distribution characteristics have an illuminance peak near the center, and the orientation of the light can be sufficiently expanded. There are cases where it is not possible.
  • the illuminance decreases as the distance from the illumination device reaches the maximum illuminance on the surface to be illuminated (for example, the floor surface when the lighting device is mounted on the ceiling). That is, such a prism pattern may not be suitable for use in applications that irradiate light uniformly over a wide range.
  • the present invention has been made in view of the above, and an object of the present invention is to provide a light distribution control member and an illumination device that can perform light distribution control so that light can be irradiated over a wider range.
  • a light distribution control member includes a linear prism provided on one surface, and the prism includes an extension direction of the prism. In a cross-section in the intersecting direction, it has an arc portion protruding in a direction away from the one surface, and a linear portion extending in a direction away from both ends of the arc portion.
  • light distribution can be controlled so that light can be irradiated over a wider range.
  • FIG. 1 is a side sectional view showing a lighting device according to an embodiment.
  • 2 is an enlarged perspective view of a portion C in FIG. 3 is a cross-sectional view taken along the line DD in FIG.
  • FIG. 4A is a graph (part 1) illustrating a light distribution characteristic of the light distribution control member according to the embodiment.
  • Drawing 4B is a graph (the 2) showing the light distribution characteristic of the light distribution control member concerning an embodiment.
  • FIG. 5 is a plan view showing an illumination mode on the illuminated surface of the illumination device according to the embodiment.
  • FIG. 6 is an explanatory diagram (part 1) of prism shape characteristics on one surface side in the light distribution control member according to the embodiment.
  • FIG. 7 is an explanatory diagram (part 2) of the prism shape characteristic on one surface side in the light distribution control member according to the embodiment.
  • FIG. 8 is an explanatory diagram (part 3) of the prism shape characteristic on the one surface side in the light distribution control member according to the embodiment.
  • FIG. 9 is a perspective view illustrating a light diffusion surface of the light distribution control member according to Comparative Example 1.
  • FIG. 10 is a cross-sectional view taken along line EE in FIG.
  • FIG. 11A is a graph (No. 1) showing a light distribution characteristic of a light distribution control member according to Comparative Example 1;
  • FIG. 11B is a graph (No. 2) showing the light distribution characteristics of the light distribution control member according to Comparative Example 1.
  • FIG. 12 is a perspective view showing a light diffusion surface of a light distribution control member according to Comparative Example 2.
  • FIG. 13 is a cross-sectional view taken along line FF in FIG.
  • FIG. 14A is a graph (part 1) illustrating a light distribution characteristic of a light distribution control member according to Comparative Example 2.
  • FIG. 14B is a graph (No. 2) showing the light distribution characteristic of the light distribution control member according to Comparative Example 2.
  • FIG. Drawing 1 is a sectional side view showing lighting installation 1 concerning an embodiment.
  • the lighting device 1 includes a light source 10 and a light distribution control member 20.
  • the illuminating device 1 may be provided with, for example, a bottomed cylindrical reflecting mirror that integrally covers the outer edge of the light source 10 and the outer edge of the light distribution control member 20.
  • the light source 10 is, for example, an LED (Light Emitting Diode), preferably a pseudo white LED.
  • the pseudo-white LED is an LED that can obtain white light.
  • an LED chip that emits light (blue light) of blue light (center wavelength: 410 nm to 480 nm) and a yellow light that partially absorbs blue light.
  • a phosphor that converts light (yellow light) having a central wavelength of 480 nm to 700 nm.
  • the light source 10 further includes a lamp house and a sealing body in addition to the LED chip and the phosphor described above.
  • the lamp house is a block body made of, for example, a white resin, and has a recess at the center.
  • the LED chip is provided in the recess, and the opening of the recess becomes a light emitting surface from which light is emitted.
  • the sealing body is, for example, a transparent resin, and the above-described phosphor is dispersed inside and filled in the recess.
  • the light distribution control member 20 is, for example, a lens sheet formed in a disk shape having a predetermined diameter using a transparent resin (for example, an acrylic resin).
  • a transparent resin for example, an acrylic resin
  • the light distribution control member 20 is arranged with its center aligned with the optical axis of the light source 10 so that a predetermined distance is formed between the surface 20 a facing the light source 10 and the light emitting surface of the light source 10.
  • the distance between the light emitting surface of the light source 10 and the light distribution control member 20 is preferably substantially equal to the diameter of the light emitting surface of the light source 10. Further, the distance between the light emitting surface of the light source 10 and the light distribution control member 20 is set corresponding to the diameter of the light emitting surface, for example, from the viewpoint of effectively exhibiting the effect of reducing color unevenness while being thin. Further, the diameter of the light distribution control member 20 is set to a predetermined length from the same viewpoint as described above.
  • the light distribution control member 20 is set so that one of the front and back surfaces 20a, 20b is a light convergence surface and the other is a light diffusion surface (a unidirectional diffusion surface).
  • a surface (other surface) 20 a facing the light source 10 is a light converging surface and a surface opposite to the other surface 20 a ( One surface) 20b is a light diffusion surface.
  • the surface of the light distribution control member 20 facing the light source 10, that is, the other surface 20a is provided with a Fresnel lens portion 21.
  • the Fresnel lens unit 21 has a plurality of concentric prisms around the optical axis of the light source 10.
  • the plurality of prisms are, for example, a refraction prism (also referred to as a Fresnel prism) 23 provided in the central portion (region A) near the optical axis of the light source 10 and a reflection prism (TIR) provided in the outer peripheral portion (region B) of the region A. (Also called “Total Internal Reflection” prism) 24.
  • the light distribution control member 20 has a concentric prism pattern including the Fresnel prism 23 and the TIR prism 24 on the other surface 20a, that is, a so-called TIR-Fresnel pattern.
  • the light passing through the TIR prism 24 travels in the direction of diffusion (also referred to as divergence), and the light passing through the TIR prism 24 located in the region B can travel efficiently in the direction of convergence. Thereby, it is possible to uniformly control the light orientation on the light convergence surface with respect to the circumferential direction of the other surface 20a while suppressing a decrease in the light amount.
  • a linear prism (projection prism) 22 is provided on one surface 20 b of the light distribution control member 20.
  • a plurality of protrusion prisms 22 are provided extending in one direction.
  • a predetermined prism pattern is formed by a plurality of protrusion prisms 22 on one surface 20 b of the light distribution control member 20.
  • FIGS. 2 is an enlarged perspective view of a portion C in FIG. 3 is a cross-sectional view taken along the line DD in FIG. 2 and 3, for the convenience of explanation, the protruding prism 22 is shown upside down from FIG. Further, in FIG. 3, hatching indicating a cross section is omitted for convenience of explanation.
  • the protruding prism 22 has a circular arc portion 22 a and straight portions 22 b and 22 b in a cross section in a direction Y (for example, a direction orthogonal to the extending direction X) intersecting the extending direction X of the protruding prism 22. And have.
  • the protrusion prism 22 has a cross-sectional shape in the Y direction having an arc portion (arc portion 22a) and straight portions (straight portions 22b, 22b).
  • the arc portion 22 a is formed in an R shape (arc shape) having a predetermined diameter protruding in a direction away from the one surface 20 b of the light distribution control member 20.
  • the straight portions 22b and 22b are formed in a straight line extending in a direction away from both ends of the arc portion 22a (that is, a direction away from each other in the Y direction) and in a direction away from the arc portion 22a toward the one surface 20b.
  • the protrusion prism 22 has a plurality of arc portions 22a as a prism pattern, and a connecting portion 22c that connects adjacent arc portions 22a and 22a.
  • the connecting portion 22c connects the straight portions 22b and 22b extending in the direction approaching each other from both ends of the adjacent arc portions 22a and 22a (that is, the direction approaching each other in the Y direction).
  • the connecting portion 22c is formed in an R shape (arc shape) having a predetermined diameter protruding in the extending direction of the straight portions 22b and 22b.
  • the plurality of protruding prisms 22 are connected by the connecting portion 22 c, so that the plurality of protruding prisms 22 are continuous in the Y direction intersecting with the X direction. Is formed.
  • the prism pattern by the ridge prism 22 and the plurality of ridge prisms 22 includes an arc portion 22a, an arc-shaped connection portion 22c, and a straight portion 22b, that is, an arc portion and a straight portion. Therefore, it can be formed by laser processing, for example. Thereby, the Fresnel lens part 21 and the protrusion prism 22 can be provided on the front and back of the light distribution control member 20.
  • the ridge prism 22 irradiates the light incident on the light distribution control member 20 from the light source 10 (see FIG. 1) toward the illuminated surface.
  • the ridge prism 22 emits light in the same manner as the R-shaped prism in the arc portion 22a, and irradiates light in the same manner as the V-shaped prism in the straight portions 22b and 22b.
  • FIGS. 4A and 4B are graphs showing the light distribution characteristics of the light distribution control member 20 according to the embodiment.
  • FIG. 4A is a rectangular coordinate graph showing a light distribution curve showing the characteristics of the luminous intensity distribution
  • FIG. 4B is a polar coordinate graph showing the light distribution curve showing the characteristics of the luminous intensity distribution.
  • 4A and 4B 0 degree (Y direction in FIG. 2) and 90 degrees (FIG. 2) including the reference axis (the optical axis of the light source 10) of the light distribution characteristic of the light distribution control member 20 (illumination device 1).
  • the light intensity distribution with respect to the polarization angle from the optical axis is indicated by a solid line and a broken line, respectively.
  • the polarization angle from the optical axis is also referred to as the light distribution angle
  • the light intensity distribution with respect to the light distribution angle is also referred to as the light intensity angle distribution.
  • the light distribution curve indicating the characteristics of the luminous intensity distribution is converted into the characteristics of the illuminance distribution (illuminance angle distribution) on a flat illuminated surface such as a floor surface corresponding to the luminous intensity angle distribution, for example. Can do. For this reason, the luminous intensity distribution light distribution curve shown in FIGS. 4A and 4B may be converted into an illuminance distribution light distribution curve.
  • the numerical values ( ⁇ 90 to 90) shown in FIG. 4A and FIG. 4B indicate the light distribution angles, respectively, and the relative intensity (relative value) with the luminous intensity at each light distribution angle being the largest angle is “1 (1.0)”. Intensity).
  • the light emitted from the light source 10 has an irradiation angle of 120 degrees.
  • the light intensity peak of the light distribution control member 20 is centered on the light distribution angle of 0 degrees (assembly). Although the center is slightly deviated due to accuracy, it has a relatively wide range ( ⁇ 25 to 25 degrees) including the center while having an appropriate dent, so-called batwing-like light distribution characteristics Become. Further, as shown in FIGS. 4A and 4B, the light distribution characteristics have anisotropy in which the alignment characteristics of light are different in the X direction (0 °) and the Y direction (90 °).
  • FIG. 5 is a plan view illustrating an illumination mode on the illuminated surface of the illumination device 1 according to the embodiment.
  • FIG. 5 shows an illumination mode on a flat illuminated surface such as a floor surface when the lighting device 1 is attached to the ceiling, for example.
  • FIG. 5 shows an illumination mode when the light source 10 (see FIG. 1) is a point light source.
  • the light emitted from the lighting device 1 is condensed in one direction (X direction) on the surface to be illuminated and becomes a broad illumination mode in the other direction (Y direction).
  • the Y direction is a direction that intersects the extending direction X of the protrusion prism 22 in the light distribution control member 20 (see FIG. 2).
  • FIGS. 6 to 8 are explanatory diagrams of prism shape characteristics on the one surface 20b side in the light distribution control member 20 according to the embodiment.
  • the prism shape on the one surface 20b side of the light distribution control member 20 will be described with reference to FIG. 6, the optical characteristics of the prism shape will be described, and the moldability by the prism shape will be described with reference to FIG.
  • the durability of the prism shape will be described with reference to FIG.
  • FIG. 6 shows a side cross section of the prism (projection prism) 22.
  • the protrusion prism 22 has a point P2 closest to the one surface 20b of the light distribution control member 20 in the connection portion 22c from the point P1 farthest from the one surface 20b of the light distribution control member 20 in the arc portion 22a.
  • the planar view length (the length in the direction of arrow D) Lc of the connection portion 22ca is shorter than the planar view length La of the arc portion 22aa (Lc ⁇ La). That is, the protrusion prism 22 has a plan view length of the connecting portion 22c shorter than a plan view length of the arc portion 22a.
  • the protrusion prism 22 has a linear portion between a point P1 farthest from the one surface 20b of the light distribution control member 20 in the arc portion 22a and a point P2 closest to the one surface 20b of the light distribution control member 20 in the connection portion 22c.
  • the plan view length Lb of 22b is longer than the sum of the plan view length La of the arc portion 22aa and the plan view length Lc of the connection portion 22ca (Lb> La + Lc).
  • the ratio (Lb: La: Lc) of the planar view length Lb of the linear portion 22b, the planar view length La of the arc portion 22aa, and the planar view length Lc of the connection portion 22ca is preferably 6: 3: 1.
  • the ratio (Lb: La + Lc) of the sum of the planar view length Lb of the linear portion 22b, the planar view length La of the arc portion 22aa, and the planar view length Lc of the connecting portion 22ca is Preferably, it is 3: 2. That is, the arc region and the straight region are preferably 3: 2.
  • the width W of the groove formed on the one surface 20b of the light distribution control member 20 (the pitch of the protrusion prism 22, that is, the planar view length Lb of the linear portion 22b, the plane of the arc portion 22aa).
  • the aspect ratio (H / W) between the total length of the viewing length La and the planar viewing length Lc of the connection portion 22ca ((Lb + La + Lc) ⁇ 2) and the depth H (the height difference between the points P1 and P2) is appropriately set.
  • the beam angle in the other direction (Y direction: see FIG. 2) can be adjusted while keeping the beam angle in one direction (X direction: see FIG. 2) constant.
  • the beam angle in one direction is maintained at 14 degrees
  • the beam angle in the other direction is 26.
  • the setting of the aspect ratio can be performed by adjusting the width and depth of the grooves of the mold 25 to be described later.
  • the connection portion 22 c is shorter than the arc view portion 22 a in plan view length.
  • the stray light of the light LB incident from 22c can be suppressed.
  • stray light is light that reenters the light distribution control member 20 due to refraction in the connection portion 22 c out of the light LB incident on the Fresnel lens portion 21.
  • luminance is reduced (this is referred to as “stray light loss”).
  • stray light of the light LB can be suppressed, so that stray light loss can be reduced.
  • FIG. 7 shows a side cross section of the (injection) molding die 25 of the light distribution control member 20.
  • the resin flows in the direction of the arrow in the molding die 25. That is, the resin flows from the connection portion forming portion 25c of the molding die 25 into the arc portion forming portion 25a.
  • the planar view length La of the arc portion 22aa is longer than the planar view length Lc of the connection portion 22ca (both refer to FIG. 6).
  • the arc portion 22a is larger than the connection portion 22c.
  • the resin flows from the connecting portion forming portion 25c into the arc portion forming portion 25a larger than the connecting portion forming portion 25c.
  • the resin flows from the connection portion forming portion 25c to the arc portion forming portion 25a larger than the connection portion forming portion 25c at the time of forming.
  • the resin easily flows into the arc portion forming portion 25a that becomes the bottom surface of the metal mold 25, and the moldability is improved.
  • FIG. 8 shows the degree of damage received by the arc portion 22a of the ridge prism 22 in a form in comparison with the comparative example (ridge prisms 22A and 22B).
  • ridge prisms 22A and 22B what causes the greatest damage is a ridge prism (V-shaped prism) 22A having a protrusion 22Aa having the smallest contact area with respect to the contact object 26.
  • ridge prism 22B having a protrusion (arc portion 22Ba) having a small contact area with respect to the contact object 26.
  • the protrusion prisms 22A and 22B have a small contact area with respect to the contact object 26, the force applied to the protrusions 22Aa and 22Ba increases, and light is transmitted due to damage to the protrusions 22Aa and 22Ba or damage to the protrusions 22Aa and 22Ba. So-called blocking that lowers the property may occur. Further, what causes the smallest damage is the ridge prism 22 having the largest protrusion (arc portion 22a) in the three examples of the contact area with the contact object 26.
  • the arc portion 22a is large, durability against external stress such as contact of the contact object 26 is improved. Further, by improving the durability, it is possible to suppress the damage to the arc portion 22a and the occurrence of blocking due to the damage to the arc portion 22a.
  • the arc portion 22a has a so-called Gaussian light distribution characteristic having an illuminance peak near the center, and the linear portions 22b and 22b have a light distribution characteristic having two illuminance peaks so as to sandwich the vicinity of the center. That is, a so-called batwing-like light distribution characteristic having a broad illuminance peak including the center is obtained.
  • light distribution control can be performed so that light can be irradiated over a wide range, and it can be suitably used for applications in which light is uniformly applied to a wide range.
  • the prism pattern by the protrusion prism 22 and the plurality of protrusion prisms 22 has an arc portion 22a, an arc-shaped connection portion 22c, and a straight portion 22b, that is, an arc portion. Since it is a simple shape combined with a straight portion, it can be formed by, for example, laser processing. As a result, it is possible to form the Fresnel lens portion 21 and the protruding prism 22 having a bat wing-like light distribution characteristic on the front and back surfaces of the same light distribution control member 20, which is difficult by machining.
  • the light distribution in one direction (X direction) can be controlled (condensed) by having the Fresnel lens portion 21.
  • light distribution control is performed so that light may be irradiated over a wide range with the light distribution control member 20, and light can be irradiated uniformly over a wide range in a to-be-illuminated surface. it can.
  • FIG. 9 is a perspective view illustrating a light diffusing surface of the light distribution control member 30 according to the first comparative example.
  • 10 is a cross-sectional view taken along line EE in FIG.
  • the hatching which shows a cross section is abbreviate
  • the light distribution control member 30 according to the comparative example 1 has an R-shaped protruding prism 32 on one surface 31 serving as a light diffusion surface.
  • the ridge prism 32 has an arc portion 32 a in a cross section in a direction Y (for example, a direction orthogonal to the extension direction X) that intersects the extension direction X of the ridge prism 32.
  • the arc portion 32 a is formed in an R shape (arc shape) having a predetermined diameter that protrudes in a direction away from the one surface 31 of the light distribution control member 30.
  • the protruding prism 32 has a plurality of arc portions 32a as a prism pattern.
  • a prism pattern in which a plurality of protruding prisms 32 are continuous in the Y direction intersecting with the X direction is formed.
  • the arc portion 32a has a relatively high light diffusibility at both ends in the Y direction of the arc portion 32a, but has a low light diffusibility at other portions than the both ends of the arc portion 32a. For this reason, in the light distribution control member 30, it becomes a light distribution characteristic which has a luminous intensity peak as shown to FIG. 11A and FIG. 11B.
  • FIG. 11A and 11B are graphs showing the light distribution characteristics of the light distribution control member 30 according to Comparative Example 1.
  • FIG. 11A is a rectangular coordinate graph showing a light distribution curve showing the characteristics of the luminous intensity distribution
  • FIG. 11B is a polar coordinate graph showing the light distribution curve showing the characteristics of the luminous intensity distribution.
  • 11A and 11B as in FIGS. 4A and 4B, 0 degrees (Y direction in FIG. 9) and 90 degrees including the reference axis (light axis of the light source) of the light distribution characteristics of the light distribution control member 30.
  • the luminous intensity distribution with respect to the polarization angle from the optical axis is indicated by a solid line and a broken line, respectively, in a cross section of degrees (X direction in FIG. 9).
  • the polarization angle from the optical axis is also referred to as the light distribution angle
  • the light intensity distribution with respect to the light distribution angle is also referred to as the light intensity angle distribution.
  • the light distribution curve indicating the characteristics of the luminous intensity distribution in FIGS. 11A and 11B is converted into the characteristics of the illuminance distribution (illuminance angle distribution) on a flat illuminated surface such as a floor surface corresponding to the luminous intensity angle distribution, for example. Can do. For this reason, the luminous intensity distribution light distribution curve shown in FIGS. 11A and 11B may be converted into an illuminance distribution light distribution curve.
  • the numerical values ( ⁇ 90 to 90) shown in FIG. 11A and FIG. 11B indicate the light distribution angle, and the luminous intensity at each light distribution angle is the maximum angle “1 (1.0)” (relative value). Intensity).
  • the light emitted from the light source has an irradiation angle of 120 degrees.
  • the light intensity peak of the light distribution control member 30 is a relatively narrow range ( ⁇ 10 to 10) including the vicinity of the center with the light distribution angle of 0 degree as the center. Range of degrees). That is, the light distribution control member 30 has a so-called Gaussian light distribution characteristic having a luminous intensity peak near the center. And when the light distribution control member 30 is applied to an illuminating device, the illuminance directly below the illuminating device is the highest illuminance on the surface to be illuminated, and the illuminance decreases as the distance from the direct illuminating device increases.
  • FIG. 12 is a perspective view showing a light diffusion surface of the light distribution control member 40 according to Comparative Example 2.
  • 13 is a cross-sectional view taken along line FF in FIG.
  • the hatching which shows a cross section is abbreviate
  • the light distribution control member 40 has a V-shaped protruding prism 42 on one surface 41 serving as a light diffusion surface.
  • the protruding prism 42 has straight portions 42b and 42b (triangular portions 43) having a predetermined inclination angle in a cross section in a direction Y (for example, a direction orthogonal to the extending direction X) intersecting the extending direction X of the protruding prism 42.
  • the triangular portion 43 is formed in a V shape (triangular shape) protruding in a direction away from the one surface 41 of the light distribution control member 40.
  • the protruding prism 42 has a plurality of triangular portions 43 as a prism pattern.
  • a prism pattern in which a plurality of protruding prisms 42 are continuous in the Y direction intersecting the X direction is formed.
  • FIG. 14A and 14B are graphs showing the light distribution characteristics of the light distribution control member 40 according to Comparative Example 2.
  • FIG. 14A is a rectangular coordinate graph showing a light distribution curve showing the characteristics of the luminous intensity distribution
  • FIG. 14B is a polar coordinate graph showing the light distribution curve showing the characteristics of the luminous intensity distribution.
  • 14A and 14B similarly to FIGS. 4A, 4B, 11A, and 11B, 0 degrees including the reference axis (light axis of the light source) of the light distribution characteristics of the light distribution control member 40 (FIG. 9).
  • FIG. 9 In the cross section at 90 degrees (X direction in FIG.
  • the light intensity distribution with respect to the polarization angle from the optical axis is indicated by a solid line and a broken line, respectively.
  • the polarization angle from the optical axis is also referred to as the light distribution angle
  • the light intensity distribution with respect to the light distribution angle is also referred to as the light intensity angle distribution.
  • the light distribution curve indicating the characteristics of the luminous intensity distribution is converted into the characteristics of the illuminance distribution (illuminance angle distribution) on a flat illuminated surface such as a floor surface corresponding to the luminous intensity angle distribution, for example. Can do. For this reason, the luminous intensity distribution light distribution curve shown in FIGS. 14A and 14B may be converted into an illuminance distribution light distribution curve. Further, the numerical values ( ⁇ 90 to 90) shown in FIG. 14A and FIG. 14B indicate the light distribution angle, and the luminous intensity at each light distribution angle is the maximum angle “1 (1.0)” (relative value). Intensity). The light emitted from the light source has an irradiation angle of 120 degrees.
  • the light intensity peak in the X direction (0 degree) of the light distribution control member 40 is 2 with the light distribution angle of 0 degree as the center and 2 near the center. Divided into two. The two luminous intensity peaks are about ⁇ 25 degrees and 25 degrees. And when the light distribution control member 40 is applied to an illuminating device, the both side parts directly under the illuminating device on the surface to be illuminated have the highest illuminance, and the illuminance just below the illuminating device is low.
  • the light distribution control member 20 has a light distribution characteristic that combines the light distribution characteristics of both the light distribution control members 30 and 40 according to the comparative example 1 and the comparative example 2 described above. That is, the light distribution control member 20 has substantially the same light distribution characteristics as the arc portion 32a of the light distribution control member 30 according to the comparative example 1 in the arc portion 22a, and the distribution according to the comparative example 2 in the linear portions 22b and 22b.
  • the light control member 40 has substantially the same light distribution characteristics as the two straight portions 42b, 42b of the triangular portion 43. Thereby, it becomes a light distribution characteristic which has a broad illumination intensity peak.
  • the illuminating device 1 includes the light distribution control member 20 so that the illumination forms of the light distribution control members 30 and 40 according to the comparative example 1 and the comparative example 2 are combined on the surface to be illuminated. It becomes an aspect. That is, the arc portion 22a brightly illuminates directly below the illumination device 1, and the straight portions 22b and 22b illuminate both sides directly below the illumination device 1. Thereby, as shown in FIG. 5, it becomes a uniform and broad illumination aspect by another direction (Y direction).
  • the configuration having the Fresnel lens portion 21 on the surface (other surface) 20a facing the light source 10 of the light distribution control member 20 has been described.
  • the Fresnel lens portion 21 may not be provided.
  • a simple flat surface may be formed on the other surface 20a.
  • the light distribution control member 20 has the Fresnel lens part 21 in the surface (other surface) 20a facing the light source 10 of the light distribution control member 20, and a protrusion on the surface (one surface) 20b on the opposite side to the other surface 20a.
  • the configuration having the prism 22 has been described, the light distribution control member 20 may be arranged in the reverse direction.
  • the connecting portion 22c may be omitted.
  • the plurality of protruding prisms 22 are arranged in the Y direction at a predetermined interval. Even with such a configuration, for example, it is possible to have a broad light distribution characteristic at an illuminance peak, that is, a batwing-like light distribution characteristic.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

Un élément de commande de distribution de lumière (20) selon un mode de réalisation comprend un prisme linéaire (22) disposé sur une surface (20a). Le prisme (22) comprend : une partie arquée (22a) qui se projette dans une direction s'éloignant de ladite surface (20a) dans une section transversale coupant la direction d'extension du prisme (22); et des parties linéaires (22b) qui s'étendent à partir des deux extrémités de la partie arquée (22a) dans des directions s'éloignant l'une de l'autre.
PCT/JP2017/021208 2016-06-14 2017-06-07 Élément de commande de distribution de lumière et dispositif d'éclairage. WO2017217303A1 (fr)

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WO2019167444A1 (fr) * 2018-03-02 2019-09-06 ミネベアミツミ株式会社 Élément optique et dispositif d'éclairage
WO2019222465A1 (fr) * 2018-05-17 2019-11-21 Amerlux Llc Appareil d'éclairage à optique linéaire et à del

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JPH11305011A (ja) * 1998-04-22 1999-11-05 Dainippon Printing Co Ltd レンズフィルム及び面光源装置
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JPH07230001A (ja) * 1993-05-17 1995-08-29 Sekisui Chem Co Ltd 光制御シート及びその製造方法
JPH11305011A (ja) * 1998-04-22 1999-11-05 Dainippon Printing Co Ltd レンズフィルム及び面光源装置
JP2005326819A (ja) * 2004-04-12 2005-11-24 Kuraray Co Ltd 光拡散板
JP2006171718A (ja) * 2004-12-16 2006-06-29 Samsung Electronics Co Ltd 光拡散部材、これを有するバックライトアセンブリ、及びこれを有する表示装置
JP2008033245A (ja) * 2006-06-26 2008-02-14 Dainippon Printing Co Ltd フレネルレンズシート、透過型スクリーン、背面投射型表示装置
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JP2012533096A (ja) * 2009-07-16 2012-12-20 サン−ゴバン グラス フランス 凹凸付き透明板及びそのような板の製造方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019167444A1 (fr) * 2018-03-02 2019-09-06 ミネベアミツミ株式会社 Élément optique et dispositif d'éclairage
WO2019222465A1 (fr) * 2018-05-17 2019-11-21 Amerlux Llc Appareil d'éclairage à optique linéaire et à del
US10731825B2 (en) 2018-05-17 2020-08-04 Amerlux Llc Linear optic and LED lighting fixture
US11143380B2 (en) 2018-05-17 2021-10-12 Amerlux Llc Linear optic and LED lighting fixture

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