WO2019059726A2 - 광속제어부재 및 광속제어부재를 사용하는 발광장치 - Google Patents
광속제어부재 및 광속제어부재를 사용하는 발광장치 Download PDFInfo
- Publication number
- WO2019059726A2 WO2019059726A2 PCT/KR2018/011288 KR2018011288W WO2019059726A2 WO 2019059726 A2 WO2019059726 A2 WO 2019059726A2 KR 2018011288 W KR2018011288 W KR 2018011288W WO 2019059726 A2 WO2019059726 A2 WO 2019059726A2
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- Prior art keywords
- light
- control member
- flux control
- ellipse
- light flux
- Prior art date
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/69—Details of refractors forming part of the light source
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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
- F21V5/04—Refractors for light sources of lens 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
- F21V7/00—Reflectors for light sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
Definitions
- the present invention relates to a light flux controlling member, and more particularly, to a light emitting device using a light flux controlling member and a light flux controlling member for uniformly dispersing light emitted from a light emitting portion in an outward direction.
- a lighting unit of a liquid crystal display monitor conventionally used in a personal computer or a television
- a surface light source device using a plurality of light emitting diodes (LEDs) as a point light source that is, a backlight unit (BLU) is known.
- LEDs light emitting diodes
- BLU backlight unit
- a configuration in which a microlens array is arranged so as to correspond to each LED in a one-to-one correspondence and light is emitted from a LED in a direction perpendicular to the plane a configuration in which a microlens array is arranged so as to correspond to each LED in a one-to-one correspondence and light is emitted from a LED in a direction perpendicular to the plane .
- the present invention has been made in order to achieve the above-mentioned object of the present invention, and it is an object of the present invention to provide a light source device, which comprises a concave portion 110 into which light of a light source 200 is incident, And a light flux control member having an exit surface (120) for emitting light of the light source (200) in an outward direction, wherein the light flux control member is arranged on the bottom surface (S) in a direction from the exit surface (120) toward the light flux control member And at least one light reflecting portion (130) for reflecting the reflected light to be evenly dispersed in the upward direction of the light flux controlling member (100) is formed.
- the light reflection portion 130 may be any one of a recessed portion formed concavely from the bottom surface and a convex portion formed convexly.
- the light reflection part 130 may form at least one of a circle, an ellipse, a polygon, and at least one linear shape around the concave part 110.
- the plurality of light reflection parts 130 may be formed concentrically with the concave part 110 as a center.
- the reflecting surface 133 may include at least one of a curved surface and a flat surface.
- the reflection surface 133 is formed such that the tilt angle at the midpoint between the peak point 131 and the lowest point 132 of the light reflection part 130 forms an angle of inclination? °.
- the tilting angle at the midpoint connecting the peak point 131 and the lowest point 132 of the light reflection part 130 with the bottom surface S is not less than 10 degrees and not more than 35 degrees, °.
- the reflecting surface 133 is formed by an inner reflecting surface 133a between the lowest points 132 adjacent to the recess 110 with respect to the peak 131 of the light reflecting portion 130 and an inner reflecting surface 133b between the peak 131 And an outer reflecting surface 133b positioned between the lowest point 134 and the highest point 131 formed at a position corresponding to the lowest point 132 with respect to the lowest point 132, And may be formed asymmetrically about the peak 131.
- the inner reflecting surface 133a and the outer reflecting surface 133b are formed so that the tangent at the center of the imaginary line connecting between the peak 131 of the light reflecting portion 130 and each of the lowest points 132 and 134, At least one of the inclination angles? 1 and? 2 formed by the inclined surface S may be 5 ° or more and 80 ° or less.
- the inclination angle? 1 of the inner reflection surface 133a may be 15 degrees or more and 80 degrees and the inclination angle? 2 of the outside reflection surface 133b may be 30 degrees or more and 50 degrees or less.
- the emitting surface 120 includes a first emitting surface region 121 formed to be concave toward the concave portion 110 as a portion intersecting the optical axis l of the light source 200, And a second emission surface region (122) formed around the first emission surface region (121) and convexly formed on the opposite side of the concave section (110), wherein the boundary between the first emission surface region (121) An inflection point may be present in the portion.
- the light flux control member has a shape that is projected on a horizontal plane when viewed from above and forms a first ellipse E1 about the concave portion 110.
- the light reflection portion 130 has a horizontal surface
- the shape projected on the concave portion 110 may form a second ellipse E2 about the concave portion 110.
- the major axis and minor axis of the first ellipse E1 may be partially overlapped with the major axis and minor axis of the second ellipse E2, respectively.
- the length of the major axis of the first ellipse E1 is A and the length of the minor axis is B
- the length of the major axis of the second ellipse E2 is ⁇ A (0 ⁇ ⁇ 1) and the length of the minor axis is ⁇ B (0 ⁇ beta ⁇ 1), and 0.85? /?
- the alpha / beta may be one.
- the present invention provides a light emitting device comprising: a substrate (300) having a plurality of light sources (200); And a light flux control member (100) installed on the substrate (300) corresponding to the light source (200);
- the light flux controlling member (100) is a light flux controlling member (100) having the above-described configuration.
- the light flux control member according to the present invention is formed on the bottom surface of the light reflecting portion that reflects light reflected from the light emitting surface in the direction of the light flux control member in the outward direction, thereby minimizing light loss and greatly improving the uniformity of light emitted through the light emitting surface There is an advantage to be able to.
- the light flux control member according to the present invention may be configured such that a light reflection portion composed of at least one of a recessed portion formed concavely in the bottom surface and a convexly formed projection portion is formed so that the light of the light source reflected in the light reflection portion, .
- the light flux control member according to the present invention can adjust at least one of the shape and the angle of the recessed portion and the protruding portion formed in the light reflection portion, thereby forming various patterns of the irradiation region irradiated from the light source according to the object There is an advantage.
- a light reflection portion is formed as a recessed groove portion or a protrusion portion of a concentric circular structure centered on a portion corresponding to the light source, that is, the center portion, and the angle
- the reflective surface of the light reflecting portion is formed asymmetrically around the peak, thereby maximizing the light emitting efficiency of the light emitted from the light source.
- the light emitting device using the light flux control member according to the present invention is advantageous in that the light condensing phenomenon is improved and the shape and uniformity of light are maximized when the light flux control member is installed in a plurality of light sources.
- the light flux control member according to the present invention may be configured such that the shape formed by the shape of the light reflection portion and the bottom surface of the light flux control member is an elliptical shape, and the ratio of the shape size is a ratio that maximizes the uniformity of light, There is an advantage of having uniformity.
- FIG. 1 is a perspective view showing a light flux control member according to the present invention.
- Fig. 2 is a bottom view of the light flux control member of Fig. 1; Fig.
- Fig. 3 is a sectional view in the III-III direction in Fig. 2.
- Fig. 4 is an enlarged cross-sectional view of the portion A in Fig. 3 enlarged.
- Fig. 5A is a cross-sectional view in the III-III direction showing a modification of the light flux control member of Fig. 1;
- FIG. 5B is an enlarged cross-sectional view of the portion B in Fig. 5A.
- 6A is a cross-sectional view showing a comparative example in which a light reflecting portion is not formed on a bottom surface.
- FIG. 6B is a photograph and a graph showing optical characteristics of the light flux control member of FIG. 6A, showing a light control area of the light flux control member of FIG. 6A in a clockwise direction, A graph showing the illuminance value according to the shade in the photograph, and a graph showing the illuminance along the horizontal direction axis in the photograph.
- Figs. 7A to 7D are photographs and graphs showing optical characteristics of the light flux control member of Fig. 1 having mutually different inclination angles, respectively.
- Figs. 7A to 7D are photographs showing a light control area of the light flux control member, A graph showing the illuminance along the axis, a graph showing the illuminance value according to the shade in the photograph, and a graph showing the illuminance along the horizontal axis in the photograph.
- FIG. 8 is a photograph and a graph showing light characteristics in an illumination area in the case of a point light source in a state where a light flux control member is not provided, wherein a photograph showing the light control area of the light flux control member, A graph showing the illuminance along the longitudinal axis, a graph showing the illuminance value according to the shade in the photograph, and a graph showing the illuminance along the horizontal axis in the photograph.
- FIG. 9 is a perspective view showing a light flux control member according to another embodiment of the present invention.
- Fig. 10 is a bottom view of the light flux control member of Fig. 9; Fig.
- Fig. 11 is a sectional view taken along the line VIII-VIII in Fig. 10.
- FIG. 12A is an enlarged sectional view of a portion C in Fig.
- Figs. 12B and 12C are cross-sectional views showing a modification of the reflection portion in Fig. 12A.
- FIG. 13 is a table showing the maximum illuminance according to the inner inclination angle and the outer inclination angle of the reflective portion.
- 14A and 14B are photographs and graphs showing the optical characteristics of the light flux control member of FIG. 1 in accordance with the inner inclination angle and the outer inclination angle of the reflective portion, and in the photographs showing the light control region of the light flux control member with reference to the clockwise direction, A graph showing the illuminance along the longitudinal axis, a graph showing the illuminance value according to the shade in the photograph, and a graph showing the illuminance along the horizontal axis in the photograph.
- 15 is a perspective view showing a light flux control member according to another embodiment of the present invention.
- Fig. 16 is a bottom view of the light flux control member of Fig. 14; Fig.
- FIG. 17 is a cross-sectional view in the XVI-XVI direction in FIG.
- FIG. 18 is a perspective view showing a light flux control member according to another embodiment of the present invention.
- Fig. 19 is a bottom view showing the light flux control member of Fig. 18; Fig.
- Fig. 20A is a cross-sectional view taken along the line IV-IV in Fig. 19, and Fig. 20B is a cross-sectional view taken along the line V-V in Fig.
- Figs. 21A and 21B are cross-sectional views showing optical characteristics in the IV-IV direction and the V-V direction according to the shape of the light reflection portion in comparison with the plane shape of the light flux control member.
- FIGS. 22A and 22B are cross-sectional views showing optical characteristics in the IV-IV direction and the V-V direction according to the shape of the light reflection portion in comparison with the planar shape of the light flux control member.
- 23A to 23B are cross-sectional views showing optical characteristics in the IV-IV direction and the V-V direction according to the shape of the light reflection portion in comparison with the planar shape of the light flux control member.
- 24A to 24B are cross-sectional views showing optical characteristics in the IV-IV direction and the V-V direction in accordance with the shape of the light reflection portion in comparison with the planar shape of the light flux control member.
- Figs. 25A to 25D are photographs and graphs showing optical characteristics of the light flux control member of Figs. 21A to 24B according to the ratio of the short axis lengths of the first ellipse and the second ellipse, respectively, A graph showing the illuminance along the longitudinal axis in the photograph, a graph showing the illuminance value according to the shade in the photograph, and a graph showing the illuminance along the horizontal axis in the photograph.
- the light flux controlling member 100 includes a concave portion 110 into which light of the light source 200 is incident and a light flux controlling member And has an emission surface 120 for emitting light of the light source 200 toward the outside.
- the light flux controlling member 100 is a lens for improving the optical characteristics of light emitted from the light source 200, that is, guiding the diffusion of uniform light into the illumination region, Various embodiments are possible.
- the light flux control member 100 may be installed corresponding to each of the plurality of light sources 200, and light from the light source 200 may be transmitted through the light flux control member 100 in a direction , That is, the optical axis (l).
- the light flux controlling member 100 preferably has a plastic material such as PC, PMMA, and PS, and is usually formed through injection molding.
- the concave portion 110 may be formed on the bottom surface of the light flux control member 100 so that the light of the light source 200 is incident on the concave portion 110.
- the concave portion 110 may have various structures depending on the coupling structure and incidence structure of the light source 200.
- the concave portion 110 may be formed in a variety of shapes such that the light of the light source 200 can be incident on the inner side of the bottom surface S of the light flux control member 100.
- the concave portion 110 may be formed so that the diameter of the concave portion 110 on the horizontal cross section decreases toward the upward direction of the light flux control member 100.
- the recess 110 may be formed to have an area of 1% or more and 4% or less of the total area of the bottom surface S of the light flux control member 100.
- the bottom surface and the concave portion 110 of the light flux controlling member 100 are generally formed in a circular shape and may have a radius of 1% to 2% or less of the bottom surface of the light flux controlling member 100 .
- the emitting surface 120 is a portion for forming the light flux controlling member 100 together with the recess 110 and may be of various forms as a light emitting device for emitting light of the light source 200 toward the outside.
- the outgoing surface of the vertical cross section passing through the optical axis (l) is formed of at least one of a straight line and a curved line .
- the curve may be formed in various shapes such as having at least one curvature.
- the outgoing surface of the vertical cross section passing through the optical axis l forms a straight line at a portion having a certain radius centering on the optical axis l, ≪ / RTI >
- the light flux controlling member 100 has a structure as shown in Fig. 6A, since the light control region irradiated by the light source 200 is limited, the irradiation region which is discontinuous between the regions irradiated with the light sources 200 There is a problem that exists.
- the light flux control member 100 is provided with at least one light reflection member 100 for reflecting the light reflected from the light output surface 120 in the direction of the light flux control member 100 and dispersing the light in the upward direction of the light flux control member 100, (130) is formed on the bottom surface (S).
- the light flux control member 100 is formed so as to be uniformly dispersed in the upward direction of the light flux controlling member 100 by reflecting the light reflected from the exit surface 120 in the direction of the light flux controlling member 100 to the bottom surface S Various forms are possible.
- the light reflection part 130 is preferably formed on the bottom surface S of the light flux control member 100 forming the incident surface 110.
- the light reflection part 130 may include a pattern of an illumination area formed by light transmitted through the light flux control member 100, May be variously formed according to the direction in which the light is to be illuminated.
- the area of the light reflection portion 130 occupying the bottom surface S of the light flux control member 100 may be formed to be 65% or more and 70% or less of the total area of the bottom surface S of the light flux control member 100 have.
- the bottom surface S of the light flux controlling member 100 and the light reflecting portion 130 are formed in a circular shape.
- the height of the light reflection part 130 may be 1% or more and 4% or less of the height of the light flux control member 100.
- the light reflection portion 130 may include any one of a recessed portion formed concavely from the bottom surface S and a convex portion formed convexly.
- the surface forming the concave portion may be formed to include at least one of a curved surface and a flat surface.
- the convex portion may be formed to include at least one of a curved surface and a flat surface if the convex portion is formed in a convex shape from the bottom surface S.
- the light reflection part 130 formed in this manner can be rounded about the concave part 110.
- the plurality of light reflection parts 130 may be formed concentrically with the concave part 110 as a center.
- At least one of the plurality of light reflection parts 130 may be formed concentrically with respect to the concave part 110.
- the concave part 110 may have a concave shape.
- the light reflection part 130 may be formed so that a plurality of convex parts concentrically around the concave part 110 are formed.
- the reflecting surface 133 formed on the basis of the highest point 131 of the light reflecting part 130 may include at least one of a curved surface and a flat surface.
- the peak point 131 is defined as a vertex of the convex portion and the vertex of the groove portion with respect to the bottom surface S
- the lowest point 132 is defined as a point corresponding to the bottom surface S.
- the reflecting surface 133 may have various shapes such as being concave or convex toward the inside of the light flux controlling member 100 when viewed from the outside when forming the curved surface.
- a plurality of the peak 131 and the lowest point 132 may be formed and the distance between the peak 131 and the lowest point 132 may be 0.5 mm or more and 0.6 mm or less.
- the reflecting surface 133 between the peak 131 and the lowest point 132 means each region of the convex portion or the concave portion formed around the peak 131.
- the peak point 131 may be formed in a plane region SA parallel to the bottom surface S at a position where it joins with the substrate 300 to facilitate connection with points, Structure.
- the planar area SA may be formed to have a size of 8% or more and 13% or less based on the size of the bottom surface S of the light reflecting member 100.
- the light reflection part 130 may have various light control areas depending on the shapes of the convex part and the concave part.
- the reflection surface 133 is formed such that the tangent line at the midpoint connecting the peak point 132 of the light reflection portion 130 is tilted at an angle of inclination? ≪ / RTI >
- the reflective surface 133 may have an inclination angle &thetas; between the tangent at the midpoint connecting the peak point 132 of the light reflection part 130 and the bottom surface S, .
- the light flux control member 100 may include a light source 200 when the light reflection part 130 formed of a plurality of concentric convex parts around the concave part 110 is formed on the bottom surface S, 7A to 7D that the uniformity in the light modulation area is greatly improved while minimizing the loss of light irradiated in the light modulation area.
- the result of the test is a result of using a light source 200 to be used as an LED element driven with a size of 1.5 mm x 1.5 mm x 0.3 mm at 1 W or more and 3 W or less.
- the light flux control member shown in Fig. 6A has the same structure except that the light reflection portion 130 is not formed on the bottom surface.
- Figs. 6B, 8 and 7A to 7D It can be confirmed that the uniformity of the light is greatly improved.
- the light reflection part 130 is formed as a protruding part, and the inclined surface 133 facing the opposite side of the concave part 110, that is, the outward side with respect to the peak of the protruding part, S) is increased and the uniformity of light is improved.
- FIG. 7A shows the embodiment shown in FIGS. 1A to 4, where the illuminance at the center portion is 173 kPa when the inclination angle is 5 DEG, which shows that the uniformity is relatively improved as compared with the structure of FIG. 6A.
- Fig. 7B shows the embodiment shown in Figs. 1A to 4, in which the illuminance at the center portion is 173 kPa when the inclination angle is 10 DEG, which shows that the uniformity is relatively improved as compared with the structure of Fig. 6A.
- Fig. 7C shows the embodiment shown in Figs. 1A to 4, in which the illuminance of the center portion is 147 ⁇ when the inclination angle is 30 ⁇ , and the uniformity is relatively improved as compared with the structure of Fig. 6A.
- FIG. 7D shows the embodiment shown in FIGS. 1A to 4A.
- the inclination angle is 40.degree.
- the illuminance of the central portion is 194 .mu.m, and the uniformity is relatively improved as compared with the structure of FIG. 6A.
- the inclination angle? Is larger than 5 ° and smaller than 40 °, more preferably larger than 10 ° and smaller than 35 °.
- a key point of the present invention is to provide a light flux control member 100 that reflects light reflected from the light emitting surface 120 in the direction of the light flux control member 100, And the light reflecting portion 130 is formed on the bottom surface S.
- the light reflection part 130 is formed as one on the bottom surface of the light flux controlling member 100 and has an asymmetrical structure with a condition of greater than 5 degrees and 80 degrees, It can be confirmed that the light condensing phenomenon is remarkably improved by the scattering effect of the light scattering.
- the experimental conditions shown in the table of Fig. 13 are different from those of the embodiments shown in Figs. 1 to 8 (the shape of the inner circumferential surface of the concave portion 110, the shape of the exit surface of the light flux control member, etc.) ,
- the light flux controlling member 100 having the structure shown in Figs. 9 to 12A was used, and the LED elements were also changed (this is the cause of the difference in maximum illuminance under the same conditions). If the light reflection part 130 is not formed on the bottom surface S, the maximum illumination is 170 lx.
- the reflecting surface 133 is formed so as to face the inner side between the lowest points 132 adjacent to the concave portion 110 with respect to the peak 131 of the light reflecting portion 130
- the reflection surface 133a and the outer reflection surface 133b located between the lowest point 134 and the highest point 131 formed at positions corresponding to the lowest point 132 around the highest point 131 are included, It is preferable that the slope 133 is formed asymmetrically about the peak 131.
- the inner reflecting surface 133a and the outer reflecting surface 133b are formed between the highest point 131 and the lowest points 132 and 134 and are located at a distance from the concave portion 110 about the highest point 131 Therefore, it is defined.
- the inner reflection surface 133a and the outer reflection surface 133b may include at least one of a curved surface and a plane with respect to the peak point 131 of the light reflection portion 130.
- the inner reflecting surface 133a and the outer reflecting surface 133b are formed so that the inner side where the concave portion 110 is located with respect to the highest point 131 and the lowest point 132 , 134 are positioned, respectively.
- the inner reflecting surface 133a and the outer reflecting surface 133b are connected to each other between the peak 131 of the light reflecting portion 130 and the respective lowest points 132 and 134
- the convergence phenomenon is improved when at least one of the inclination angles? 1 and? 2 formed by the tangent line at the center of the imaginary line and the bottom surface S is formed at 5 ° or more and 80 ° or less.
- the inclination angle? 1 of the inner reflection surface 133a is 15 degrees or more and 80 degrees and the inclination angle? 2 of the outer reflection surface 133b is 30 degrees or more and 50 degrees or less, It can be confirmed that it has a relatively small value.
- the internal angle of inclination ( ⁇ 1) is respectively, less than 25 ° more than 5 ° ', '25 ° or more and less than 40 ° ", more than '40 ° less than 50 °, and more than '50 ° 90 ° "when the formation to a range of less than the outer inclination angle ( ⁇ 2) is '20 ° or more and less than 40 ° ', '20 ° or more and less than 80 °', '20 ° or more and less than 50 °, and '20 ° or more and less than 50 ° ', It can be seen that the illuminance of the central portion has a relatively smaller value than the other conditions.
- the inside angle of inclination ( ⁇ 1) and the outer inclination angle ( ⁇ 2) is when the 70 °, 145 °, respectively, the maximum roughness is 145lx, the inside angle of inclination ( ⁇ 1) and When the outer inclination angle [theta] 2 is 80 [deg.] And 145 [deg.], Respectively, it is confirmed that the light converging effect is significantly improved at 145 lx.
- the light reflection portion 130 has a single S-shaped concave portion 110 on the bottom surface S, It may be formed into a single concave groove such as a circle, a single square, or the like.
- the position D of the light reflection portion 130 from the concave portion 110 is about 1.33 with respect to the height H of the highest point (the highest position) from the bottom surface of the light flux control member 100.
- the position D of the light reflection portion 130 from the concave portion 110 is preferably 1.23 to 1.43 with respect to the height H from the bottom of the light flux controlling member 100 to the highest point (the highest position) .
- the light reflection part 130 is formed in a planar shape in which the recess 131 is located on the inner side where the recess 110 is positioned with respect to the peak 131, And the lowermost points 132 and 134 are respectively located in the trapezoidal shape.
- the light reflection part 130 is a curved line whose sloped surface is not a straight line with respect to a cross section and curved surfaces connecting the shortest point 131 to the lowest points 132 and 134 are curved as shown in FIG. .
- the inner inclination angle? 1 and the outer inclination angle? 2 are parallel to the imaginary line passing through the highest point 131 and the lowest points 132 and 134, and are inclined at right angles to the inner reflection surface 133a and the outer reflection surface 133b Line and the inclination angle of the bottom surface S, respectively.
- the light reflection part 130 may be formed of a plurality of concentric convex parts about the concave part 110 as well as a circular shape having a circular shape centering on the concave part 110, And may be formed to form at least one of at least one linear shape.
- the light reflection part 130 formed in this manner may have at least one of a circle, an ellipse, a polygon, and at least one linear shape having a plane shape centered on the concave part 110.
- the plurality of light reflection parts 130 may be at least one of a circle, an ellipse, a polygon, and one or more linear shapes with the concave part 110 as a center. .
- a light emitting device may include a substrate 300 on which a plurality of light sources 200 are mounted, and; And a light flux control member 100 provided on the substrate 300 in correspondence with the light source 200 as the light flux control member 100 having the above-described configuration.
- the light source 200 includes a white LED element that emits white light, a yellow LED element that emits yellow light, a blue LED element, a red LED element, a green LED element, a " A blue LED device, a red LED device, and a green LED device " may be used.
- the substrate 300 may be any member that can mount an LED device such as a PCB, an FPCB, and a metal PCB, on which the light source 200 is mounted.
- a heat dissipating member (not shown) having a high heat dissipation effect such as aluminum for emitting heat generated in the light source 200 may be coupled.
- the heat dissipating member may have various structures and shapes for emitting heat generated in the light source 200.
- the light flux control member 100 has a configuration as shown in FIGS. 1 to 12C, and the pattern and size of the illumination region can be variously formed according to the shape of the light reflection portion 130.
- the exit surface 120 of the light flux control member 100 described above is a portion that intersects with the optical axis (l) of the light source 200 and faces the concave portion 110 side
- a second emission surface area 122 formed around the first emission surface area 121 and formed convexly on the opposite side of the concave part 110.
- the first emission surface area 121 may have a concave shape.
- the exit surface 120 is formed on the outer surface of the light flux control member 100, and is formed continuously around the first exit surface region 121 and the first exit surface region 121 at the central portion
- the second emission surface region 122 may be formed.
- the optical axis L of the light source 200 is a direction in which light travels from the center of a stereoscopic light flux from the light source 200 to a direction perpendicular to the bottom S from the center of the light source 200 It refers to the direction of light propagation.
- the light source 200 uses an LED element having a rectangular shape or a circular shape.
- a direction extending upward beyond a center point of the planar shape of the general bar light source 200 is defined as an optical axis (?) Of the light source 200, Is generally defined.
- the first emitting surface region 121 is a region intersecting with the optical axis (l) of the light source 200, and may be a curved surface shape concave on the side of the concave portion 110, have.
- the second emission surface region 122 may be a region formed around the first emission surface region 121 and may be a curved surface formed convexly toward the opposite side of the recess 110 .
- the inflection point is a position for connecting the first emission surface region 121 and the second emission surface region 122 so that the first emission surface region 121 and the second emission surface region 122 form a gentle curve, It is preferable that the inclination of the tangent line is formed so as to be continuously changed.
- the technical point of the present invention is that the light flux control member, that is, the light reflecting unit 130 having the above-described characteristics is provided on the bottom surface of the lens.
- the light flux control specified in Korean Patent No. 10-0971639 The present invention is not limited thereto.
- a shape formed by the bottom surface S of the light flux control member and a shape of the light reflection portion 130 are formed so that the light from the light source, And the size of the ellipse can be appropriately adjusted to a size having the optimum light uniformity, and an embodiment thereof will be described below.
- the shape projected on the horizontal plane when the light flux controlling member is viewed from above is the first ellipse E1
- a shape projected on the horizontal plane when viewed from above may form a second ellipse E2 with the concave portion 110 as a center.
- Figs. 18 to 25D will be described by taking an example of the light reflection portion 130 shown in Figs. 9 to 12C.
- the shape projected on the horizontal plane when the light flux control member is viewed from above may be a first ellipse E1 centered on the recess 110, And a shape projected on the horizontal plane when the light reflection part 130 is viewed from above forms a second ellipse E2 with the concave part 110 as a center.
- the first ellipse E1 is a shape projected on a horizontal plane around the concave portion 110 when viewed from above, and may be an elliptical shape having various sizes.
- the second ellipse E2 is a shape that is projected on a horizontal plane around the concave portion 110 when viewed from above the light reflector 130.
- the second ellipse E2 has a smaller size than the first ellipse E1 It may be elliptical.
- the major axis and the minor axis of the first ellipse E1 may be partially overlapped with the major axis and minor axis of the second ellipse E2, respectively.
- the minor axis portion of the second ellipse E2 overlaps with the minor axis of the second ellipse E2 to overlap the major axis of the second ellipse E2
- the foci can be on a straight line.
- first ellipse E1 and the second ellipse E2 have the same center, that is, the center of the concave portion 110, and the major axis and the minor axis are the same axis.
- the length of the major axis of the first ellipse E1 is A and the length of the minor axis is B
- the length of the major axis of the second ellipse E2 is ⁇ A (0 ⁇ ⁇ 1) and the length of the minor axis is ⁇ B (0 ⁇ beta ⁇ 1), and 0.85? /?
- the value ⁇ has a value between 0 ⁇ ⁇ 1
- the length ⁇ B of the minor axis of the two ellipses E2 is smaller than the minor axis length B of the first ellipse E1, 0 ⁇ ⁇ 1.
- the long axis of the second ellipse E2 and the short axis of the first ellipse E1 are the same as the long axis of the second ellipse E2, 2
- the short axis of the ellipse (E2) and its length may be proportional to each other.
- Figs. 25A to 25D when the? /? Value is 1 and the central illuminance is 1,920 lx and 0.9, The center illuminance is 2,060 lx and the central illuminance is 2,190 lx.
- FIG. 25A shows a case where the value of alpha / beta is 1 as shown in FIG. 21A and FIG. 21B.
- the illuminance graph of the longitudinal and transverse axes also supports this.
- Fig. 25C shows a case where the value of? /? Is 0.7 as shown in Figs. 23A and 23B
- Fig. 25D shows a case of? /?
- the photograph of the dimming area and the illuminance graph of the longitudinal and transverse axes show that the center illuminance is high and the light is gathered at the center and is distributed.
- the value of center illuminance is less than 2,000lx at 0.85 ⁇ / ⁇ ⁇ 1.15, so that it is a ratio of ⁇ and ⁇ where light is efficiently scattered. It can also be seen that the shape of the light reflection portion 130 of the light flux control member and the bottom surface S of the light flux control member having the uniformity are the shapes.
- the center illuminance value is as small as 1,920 lx, so that the light passing through the emitting surface 120 is efficiently dispersed and the light is uniformly irradiated.
- the ratio of the long axis of the first ellipse E1 to the length of the long axis of the second ellipse E2 and the short axis of the first ellipse E1 And the length of the short axis of the second ellipse E2 are equal to each other, which means that the first ellipse E1 and the second ellipse E2 are in a similar relationship to each other.
- the first ellipse E1 and the second ellipse E2 E2 may be a relationship in which they are joined together with only a proportional change in size without rotation.
- the state may be the same as the shape of the first ellipse E1.
- the bottom surface S of the light flux control member according to the present invention may be formed concave or convex, and may be formed flat, as shown in FIGS. 20A and 20B.
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Abstract
Description
Claims (21)
- 광원(200)의 빛이 입사되는 오목부(110)와, 상기 오목부(110)와 함께 광속제어부재를 형성하며, 상기 광원(200)의 빛을 외부 방향으로 발산시키는 출사면(120)을 가지는 광속제어부재로서,상기 광속제어부재는 저면(S)에 상기 출사면(120)으로부터 상기 광속제어부재 방향으로 반사된 빛을 재반사하여 상기 광속제어부재(100)의 상측 방향으로 고르게 분산되도록 하는 하나 이상의 광반사부(130)가 형성된 것을 특징으로 하는 광속제어부재.
- 청구항 1에 있어서,상기 광반사부(130)는,상기 저면(S)으로부터 오목하게 형성된 요홈부 및 볼록하게 형성된 볼록부 중 어느 하나인 것을 특징으로 하는 것을 특징으로 하는 광속제어부재.
- 청구항 2에 있어서,상기 광반사부(130)는,상기 오목부(110)를 중심으로 하여 원, 타원, 다각형 및 하나 이상의 선형 중 적어도 어느 하나를 이루는 것을 특징으로 하는 광속제어부재.
- 청구항 2에 있어서,상기 광반사부(130)는, 복수개로 형성되며,상기 복수개의 광반사부(130)는, 상기 오목부(110)를 중심으로 하여 동심을 이루는 것을 특징으로 하는 광속제어부재.
- 청구항 2에 있어서,상기 광속제어부재의 저면으로부터 상기 광반사부(130)의 최정점(131) 및 최저점(132) 사이의 반사면(133)은 곡면 및 평면 중 적어도 하나의 면을 포함하는 것을 특징으로 하는 광속제어부재.
- 청구항 5에 있어서,상기 반사면(133)은, 상기 광반사부(130)의 최정점 및 최저점(132) 사이를 연결하는 가상선의 중점에서의 접선이 상기 저면(S)과 이루는 경사각(θ)이 5° 이상 40°이하인 것을 특징으로 하는 광속제어부재.
- 청구항 5에 있어서,상기 반사면(133)은, 상기 광반사부(130)의 최정점 및 최저점(132) 사이를 연결하는 중점에서의 접선이 상기 저면(S)과 이루는 경사각(θ)이 10° 이상 35°이하인 것을 특징으로 하는 광속제어부재.
- 청구항 5에 있어서,상기 반사면(133)은,상기 광반사부(130)의 최정점(131)을 기준으로 상기 오목부(110)에 인접하는 최저점(132) 사이의 내측반사면(133a)과, 상기 최정점(131)을 중심으로 상기 최저점(132)에 대응되는 위치에 형성되는 최저점(134)과 상기 최정점(131) 사이에 위치되는 외측반사면(133b)을 포함하며;상기 최정점(131)을 중심으로 비대칭으로 형성되는 것을 특징으로 하는 광속제어부재.
- 청구항 8에 있어서,상기 내측반사면(133a) 및 외측반사면(133b)은, 상기 광반사부(130)의 최정점(131)과 각각의 최저점(132, 134) 사이를 연결하는 가상선의 중심에서의 접선과 상기 저면(S)이 이루는 경사각(θ1, θ2) 중 적어도 하나가 5° 이상 80°이하인 것을 특징으로 하는 광속제어부재.
- 청구항 8에 있어서,상기 내측반사면(133a)의 경사각(θ1)이 15° 이상 80°이고, 상기 외측반사면(133b)의 경사각(θ2)이 30° 이상 50°이하인 것을 특징으로 하는 광속제어부재.
- 청구항 5 내지 청구항 10에 있어서,상기 출사면(120)은,상기 광원(200)의 광축(ℓ)과 교차하는 부분으로서 상기 오목부(110) 측으로 오목하게 형성된 제1출사면 영역(121)과, 상기 제1출사면 영역(121)의 주위에 위치하고 상기 오목부(110) 반대측으로 볼록하게 형성된 제2출사면 영역(122)을 포함하고,상기 제1출사면 영역(121)과 상기 제2출사면 영역(122)의 경계부분에 변곡점이 존재하는 것을 특징으로 하는 광속제어부재.
- 청구항 1 내지 청구항 10 중 어느 하나의 항에 있어서,상기 광속제어부재는, 상측에서 보았을 때 수평면 상에 투영되는 형상이 상기 오목부(110)를 중심으로 한 제1타원(E1)을 이루고,상기 광반사부(130)는, 상측에서 보았을 때 수평면 상에 투영되는 형상이 상기 오목부(110)를 중심으로 한 제2타원(E2)을 이루는 것을 특징으로 하는 광속제어부재.
- 청구항 12에 있어서,상기 제1타원(E1)의 장축 및 단축은, 각각 상기 제2타원(E2)의 장축 및 단축에 일부가 중첩되는 것을 특징으로 하는 광속제어부재.
- 청구항 13에 있어서,상기 제1타원(E1)의 장축의 길이가 A, 단축의 길이가 B일 때, 상기 제2타원(E2)의 장축의 길이는 αA (0<α<1), 단축의 길이는 βB (0<β<1)이며, 0.85≤α/β≤1.15인 것을 특징으로 하는 광속제어부재.
- 청구항 14에 있어서,상기 α/β는 1인 것을 특징으로 하는 광속제어부재.
- 복수개의 광원(200)이 설치된 기판(300)과;상기 광원(200)에 대응되어 상기 기판(300)에 설치되는 광속제어부재(100)를 포함하며;상기 광속제어부재(100)는 청구항 1 내지 청구항 11중 어느 하나에 따른 광속제어부재(100)인 것을 특징으로 하는 발광장치.
- 청구항 16에 있어서,상기 출사면(120)은,상기 광원(200)의 광축(ℓ)과 교차하는 부분으로서 상기 오목부(110) 측으로 오목하게 형성된 제1출사면 영역(121)과, 상기 제1출사면 영역(121)의 주위에 위치하고 상기 오목부(110) 반대측으로 볼록하게 형성된 제2출사면 영역(122)을 포함하고,상기 제1출사면 영역(121)과 상기 제2출사면 영역(122)의 경계부분에 변곡점이 존재하는 것을 특징으로 하는 발광장치.
- 청구항 16에 있어서,상기 광속제어부재는, 상측에서 보았을 때 수평면 상에 투영되는 형상이 상기 오목부(110)를 중심으로 한 제1타원(E1)을 이루고,상기 광반사부(130)는, 상측에서 보았을 때 수평면 상에 투영되는 형상이 상기 오목부(110)를 중심으로 한 제2타원(E2)을 이루는 것을 특징으로 하는 발광장치.
- 청구항 18에 있어서,상기 제1타원(E1)의 장축 및 단축은, 각각 상기 제2타원(E2)의 장축 및 단축에 일부가 중첩되는 것을 특징으로 하는 발광장치.
- 청구항 19에 있어서,상기 제1타원(E1)의 장축의 길이가 A, 단축의 길이가 B일 때, 상기 제2타원(E2)의 장축의 길이는 αA (0<α<1), 단축의 길이는 βB (0<β<1)이며, 0.85≤α/β≤1.15인 것을 특징으로 하는 발광장치.
- 청구항 20에 있어서,상기 α/β는 1인 것을 특징으로 하는 발광장치.
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