KR101610317B1 - Lighting device comprising gab member for a lighting unit - Google Patents

Abstract

The present invention relates to a lighting apparatus including a gap member for a lighting unit according to an embodiment, and more particularly, to a lighting apparatus including a gap member for a lighting unit, To a lighting device comprising a gap member for a lighting unit. A lighting device including a gap member for a lighting unit according to an embodiment includes: a light emitting portion including a substrate and a plurality of LEDs arranged on the substrate; A lens disposed on the light emitting portion; And a gap member disposed between the light emitting unit and the lens, the gap member separating the substrate from the lens at a predetermined interval, the gap member comprising: a ring-shaped wall portion including an upper surface; And a reflection portion having an opening portion through which the plurality of LEDs are exposed, the reflection portion having a downwardly inclined surface formed in a direction from a top surface of the wall portion toward a center of the opening portion, wherein the gap member includes an inner surface having a flat portion , The substrate includes an outer peripheral surface having a flat portion corresponding to the flat portion of the gap member, and the flat portion of the inner side surface of the gap member and the flat portion of the substrate are arranged in the same direction.

Description

TECHNICAL FIELD [0001] The present invention relates to a lighting apparatus including a gap member for a lighting unit.

An embodiment relates to a lighting apparatus including a gap member for a lighting unit used in a lighting apparatus.

BACKGROUND ART [0002] Light emitting diodes (LEDs) have been used as light sources for various electronic parts, electric sign boards, and lighting devices because they have low power consumption and long life and can operate at low cost. In order to increase the efficiency of light emitted from the LED lamp, a reflection plate or the like is often formed around the LED. In an illumination device having a lens, a lens and an LED are separated from each other by a predetermined distance May exist.

An embodiment provides a lighting apparatus including a gap member for a lighting unit in which the lens of the lighting unit including the lens does not directly press the LED.

Embodiments provide a lighting device including a gap member for a lighting unit having a reflector to increase the efficiency of light emitted from the lighting unit.

An embodiment provides a lighting apparatus including a gap member for a lighting unit that improves withstand voltage characteristics of the lighting unit.

An embodiment includes a gap member for an illumination unit which has a reflection plate for enhancing the efficiency of light emitted from the illumination unit at the same time as the lens of the illumination unit does not directly press the LED and at the same time can improve the withstand voltage characteristic of the illumination unit Thereby providing a lighting device.

A lighting device including a gap member for a lighting unit according to an embodiment includes: a light emitting portion including a substrate and a plurality of LEDs arranged on the substrate; A lens disposed on the light emitting portion; And a gap member disposed between the light emitting unit and the lens, the gap member separating the substrate from the lens at a predetermined interval, the gap member comprising: a ring-shaped wall portion including an upper surface; And a reflection portion having an opening portion through which the plurality of LEDs are exposed, the reflection portion having a downwardly inclined surface formed in a direction from a top surface of the wall portion toward a center of the opening portion, wherein the gap member includes an inner surface having a flat portion , The substrate includes an outer peripheral surface having a flat portion corresponding to the flat portion of the gap member, and the flat portion of the inner side surface of the gap member and the flat portion of the substrate are arranged in the same direction.

A lighting device including a gap member for a lighting unit according to an embodiment includes: a light emitting portion including a substrate and a plurality of LEDs arranged on the substrate; A lens disposed on the light emitting portion; And a gap member disposed between the light emitting unit and the lens, the gap member separating the substrate from the lens at a predetermined interval, the gap member comprising: a ring-shaped wall portion including an upper surface; And a reflection portion having an opening portion through which the plurality of LEDs are exposed and having a downward inclined surface formed in a direction from the upper surface of the wall portion toward the center of the opening portion, wherein the substrate is disposed in the wall portion, And a bottom surface in contact with an edge of an upper surface of the substrate, wherein the wall portion of the gap member includes an inner surface in contact with an outer circumferential surface of the substrate.

An embodiment provides a lighting apparatus including a gap member for a lighting unit in which the lens of the lighting unit including the lens does not directly press the LED.

Embodiments can provide a lighting device including a gap member for a lighting unit having a reflector for enhancing the efficiency of light emitted from the lighting unit.

Embodiments can provide a lighting apparatus including a gap member for a lighting unit that improves withstand voltage characteristics of the lighting unit.

An embodiment includes a gap member for an illumination unit which has a reflection plate for enhancing the efficiency of light emitted from the illumination unit at the same time as the lens of the illumination unit does not directly press the LED and at the same time can improve the withstand voltage characteristic of the illumination unit A lighting device can be provided.

1 is a side sectional view showing a lighting unit according to a first embodiment;
2 is a side cross-sectional view of the light emitting portion of Fig.
3 is a plan view of the light emitting portion of Fig.
4 is another example of the light emitting portion of Fig.
5 is another example of the light emitting portion of Fig.
6 is another example of the light emitting portion of Fig.
FIG. 7 is a side sectional view showing the gap member of FIG. 1; FIG.
Figure 8 is a perspective view of the gap member of Figure 1;
Figure 9 is a top view of the gap member of Figure 1;
10 is a bottom view of the gap member of Fig.
11 is a perspective view of another example of the gap member of Fig.
12 is a plan view of another example of the gap member of Fig.
13 is a bottom view of another example of the gap member of Fig.
14 is a view showing an irradiation surface in the case where the illuminance distribution is circular;
15 is a view showing an irradiation surface in the case where the illuminance distribution is a square;
16 is a side cross-sectional view of a lens in which the incident surface is composed of only the prism surface and the emitting surface is flat.
Fig. 17 is a view showing spatial light distribution by the illumination unit including the lens of Fig. 16; Fig.
18 is a side cross-sectional view of a lens in which the incident surface is composed of only the prism surface and the emitting surface is in the form of a spherical lens.
19 is a view showing spatial light distribution by the illumination unit including the lens of Fig. 18; Fig.
20 is a view showing an illuminance distribution by a lighting unit including the lens of Fig. 18; Fig.
21 is a perspective view of a lens in which an incident surface is composed of a prism surface and a valley surface and an emission surface is a spherical lens shape;
22 is a plan view of a lens in which an incident surface is composed of a prism surface and a valley surface and an emission surface is a spherical lens shape;
23 is a side cross-sectional view of a lens in which an incident surface is composed of a prism surface and a valley surface and an emission surface is a spherical lens shape.
Fig. 24 is a view showing an optical path of light emitted from the LED of the illumination unit of Fig. 1; Fig.
Fig. 25 is a view showing spatial light distribution by the illumination unit using the lens of Fig. 21; Fig.
26 is a view showing the illuminance distribution by the illumination unit using the lens of Fig.
Fig. 27 is a view showing the illuminance distribution of the irradiation surface according to the FTE calculator; Fig.
28 is a view showing spatial light distribution by the illumination unit using the lens of Experimental Example 5. Fig.
29 is a view showing the illuminance distribution in the illumination unit using the lens of Experimental Example 5. Fig.
30 is a side sectional view showing the illumination unit according to the second embodiment;
31 is a side sectional view showing a lighting unit according to a third embodiment;
32 is a side sectional view showing the illumination unit according to the fourth embodiment;

In the description of the embodiments, the reference to each layer above or below is assumed to be on the side where the lens 140 is present and downward with the light emitting portion 101, unless otherwise specified. In the case where coordinate axes indicating a space are also shown in the drawings, the coordinate axes will be described with reference to the coordinate axes. The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size of each component does not entirely reflect the actual size. Hereinafter, the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a side sectional view showing a lighting unit 100 according to the first embodiment, Fig. 2 is a side sectional view of the light emitting portion 101 in Fig. 1, Fig. 3 is a plan view of the light emitting portion 101 in Fig. 4 is another example of the light emitting portion 101 of Fig. 1, Fig. 5 is another example of the light emitting portion 101 of Fig. 1, and Fig. 6 is another example of the light emitting portion 101 of Fig.

Referring to FIG. 1, the illumination unit 100 includes a light emitting portion 101, a gap member 130, and a lens 140. The lighting unit 100 can be mounted on an outdoor space such as a street lamp or an outdoor unit arranged at regular intervals, and can illuminate with an appropriate light distribution and an illuminance distribution with respect to a frontal area such as an outdoor unit, a streetlight,

The light emitting unit 101 includes a plurality of LEDs 120 mounted on a substrate 110 and the arrangement of the plurality of LEDs 120 may be variously changed.

The substrate 110 may include an aluminum substrate, a ceramic substrate, a metal-core PCB, a general PCB, and the like. In addition, the substrate 110 may be formed of a material that efficiently reflects light, or the surface may be formed of a color in which light is efficiently reflected, for example, white, silver, or the like. The plurality of LEDs 120 include white LEDs or alternatively can utilize colored LEDs such as red LEDs, blue LEDs, and green LEDs. The emission angle of the LED 120 may be in the range of 120 ° to 160 ° or a lambertian-fully diffused surface.

2 and 3, the substrate 110 of the light emitting portion 101 has a disk shape of a predetermined diameter D1 and a diameter D1 is a width that can be accommodated below the gap member 130 . A flat portion 114 may be formed on one side of the substrate 110 and the flat portion 114 may identify a coupling position between components of the illumination unit 100 or may perform a rotation prevention function.

A plurality of screw holes 113 may be formed on the substrate 110. A screw may be inserted into the screw hole 113 to fasten the substrate 110 to a tool such as a street lamp or an outdoor unit, Is fastened to the case of the unit (100). Here, rivets, hooks and the like may be inserted into the screw holes 113, not with screws. The substrate 110 may not have a plurality of screw holes 113.

3 includes eight LEDs 120 arranged on a substrate 110. The LEDs 120 are arranged on a circumference having a predetermined radius from the center of the substrate 110 at regular intervals ) Can be arranged. The eight LEDs 120 may be arranged on an elliptical shape or a rectangular shape instead of a circular shape.

The light emitting portion 101B of FIG. 4 is a configuration in which ten LEDs 120 are arranged on a substrate 110. For example, eight LEDs 120 are arranged at regular intervals on a circumference having a predetermined radius from the center of the substrate And two LEDs are arranged in the inner region of the circumference.

5 includes 12 LEDs 120 arranged on a substrate 110. For example, eight LEDs 120 are arrayed at regular intervals on a circumference having a predetermined radius from the center of the substrate And four LEDs 120 are arranged at regular intervals on the circumference of a concentric circle having a smaller radius than the circumference.

The light emitting portion 101D shown in Fig. 6 may be arranged at a position where the entire small circumferential LED 120 is rotated at an angle of 45 degrees with respect to the center of the substrate, as compared with Fig.

The arrangement of LEDs 120 shown in FIGS. 3-6 is exemplary and the spacing between the LEDs 120 arranged on the circumference may not necessarily be a constant distance depending on the type of illumination surface required, ) The arrangement and the number of the LEDs 120 on the above may vary depending on the luminous intensity, the light distribution, and the illuminance distribution, and may be changed within the technical scope of the embodiment. When the term "light emitting portion 101" is used without specifying specific light emitting portions 101A, 101B, 101C, and 101D having specific LED 120 arrangements in drawings or the like, .

Fig. 7 is a side sectional view showing the gap member 130 of Fig. 1, Fig. 8 is a perspective view of the gap member 130 of Fig. 1, Fig. 9 is a plan view of the gap member 130 of Fig. Fig. 11 is a perspective view of another example of the gap member 130 of Fig. 1, Fig. 12 is a plan view of another example of the gap member 130 of Fig. 1, and Fig. 13 is a plan view of the gap member 130 of Fig. (130). ≪ / RTI >

1 and 7 to 13, the gap member 130 includes a ring-shaped reflection portion 132 having a downwardly inclined surface formed in the center direction, and a ring-shaped reflection portion 132 formed concentrically with the reflection portion 132, Shaped wall portion 131 as shown in FIG. Since the gap member 130 has a flat ring shape as a whole, the gap portion 130 has an opening 133 having an inner diameter of the reflection portion 132 as a diameter.

The reflector 132 can reflect the light emitted from the LED 120 without extinguishing it, thereby enhancing the light efficiency of the illumination device. Since the light is radiated toward the upper side of the reflection part 132, the reflection part 132 assists the upward light emission.

The bottom surface of the reflective portion 132 is in contact with the upper surface of the light emitting portion 101 and the inner peripheral surface of the wall portion 131 is in contact with the outer peripheral surface of the light emitting portion 101, Respectively. It is preferable to make the inner diameter of the reflecting portion 132 smaller than the inner diameter of the wall portion 131 and the outer diameter of the light emitting portion 101 in order to prevent the light emitting portion 101 from being deviated upwardly from the gap member 130. [

 At the same time, the gap member 130 separates the substrate 110 and the lens 140 at a predetermined interval G1. The lens 140 does not press the LED 120 because the gap G1 is greater than or equal to the thickness of the LED 120 arranged on the substrate 110 and the space between the lens 140 and the substrate 110 The light emitting angle and the optical dispersion can be induced.

The gap member 130 prevents direct contact of other surfaces such as the case of the illumination unit with other surfaces except the bottom surface of the light emitting portion 101. When the gap member 130 is formed of an insulating material, And the light emitting portion 101 are insulated. In addition, if the heat radiating pad of the insulating material is brought into close contact with the bottom surface of the light emitting portion 101, the light emitting portion 101 can prevent problems such as electrical short, EMI and EMS, .

The space 105 may be filled with silicon or a silicone resin material. The LED 120 of the light emitting portion 101 is exposed through the opening portion 133 and the edge 144 of the lens 140 is disposed on the upper surface of the gap member 130.

A flat portion 134 may be formed on one side of the gap member 130 and the flat portion 134 may identify a coupling position between components of the illumination unit 100 or may perform a rotation prevention function. 3 to 6, the flat portion 114 is formed on one side of the substrate 110 like the substrate 110 of the light emitting portion 101, and the gap 110 shown in FIGS. 8 to 13 It is assumed that the flat member 134 is formed in the gap member 130 like the member 130. 10 and 13, not only the outer side surface but also the inner side surface of the flat portion 134 of the gap member 130 are flat so that the substrate 110 is held between the two flat portions 114, (130). The inner circumferential surface of the wall portion 131 and the outer circumferential surface of the substrate 110 are not rotated or twisted because they are flat on one side.

The reflecting portion 132 extends from the upper surface of the wall portion 131 with a predetermined inclination toward the center of the opening portion 133. That is, the reflecting portion 132 is inclined at a predetermined inclination angle? 1 around the outer periphery of the opening 133 of the gap member 130. The prism surface 142 of the lens 140 is spaced apart from the inclined surface of the reflective portion 132 so that the amount of reflected light can be changed according to the inclination angle? 1 and the width of the reflective portion 132. The inner opening 133 of the reflecting portion 132 may be formed in a circular shape having a predetermined diameter D2 as shown in Figs.

The light that comes from the LED 120 and comes into contact with the reflective portion 132 is reflected by the inclined surface of the reflective portion 132 and exits through the lens 140 to the outside. Accordingly, the present invention further has an effect of improving light efficiency as compared with a conventional gap member not including the reflective portion 132. It has already been described that the gap member 130 according to the present embodiment improves the withstand voltage characteristic compared to the conventional gap member.

11 to 13, the gap member 130 may have an electrode passage portion 135 through which electric wires or electrodes (not shown) can be connected to the substrate 110. [

8 to 13, only the gap member 130 having the flat portion 134 is shown, and the gap member 130 having the flat portion 134 is the preferred embodiment. However, the gap member 130, which is entirely circular without the flat portion 134, may be rotated or twisted between the components. However, the gap member 130 of the above- And therefore it is to be understood that the present invention is not limited to the description of the gap member 130 having the flat portion 134 but the best mode.

Prior to the description of the shape and structure of the lens 140, the lens 140 shown in the embodiments disclosed in association with the present invention is generally used in a lighting unit 100 mounted on an outdoor light such as a street lamp, an outdoor lamp, It is necessary to first determine which of the lens 140 has an effective illuminance distribution.

<Effective roughness distribution>

Fig. 14 is a view showing an illuminated surface when the illuminance distribution is circular, and Fig. 15 is a view showing illuminated surfaces when the illuminance distribution is a square.

Referring to FIGS. 14 and 15, the case where the shape of the illuminance distribution to which the light is irradiated from the illumination unit 100 becomes a square is reduced as compared with the case where the illumination is circular, The blind spot A3 can be reduced, and the light A1 irradiated to the area where the illumination does not need to be reduced can be reduced, thereby showing an excellent efficiency.

Street lamps and outdoors using a lighting unit 100 having a circular illuminance distribution and street lamps and outdoors using a lighting unit 100 having a square illuminance distribution are compared. It is possible to improve the illuminance distribution between adjacent street lamps or the illumination distribution between adjoining outdoor lights and to reduce or eliminate the blind spot A3 so that the distance from the latter to the streetlight or the outdoors . In addition, it is possible to reduce the number of lamps or outdoor lamps required to achieve the necessary illumination, thereby reducing maintenance, management and operation costs.

In FIG. 15, an example of a square illumination distribution is illustrated in a rectangle. However, it is more advantageous to have a rectangular illumination distribution instead of a square in order to illuminate a narrow and long illuminated surface, such as a street lamp or an outdoor lamp that illuminates a road. Therefore, depending on the application in which the illumination unit 100 is used, either the rectangular or square illumination distribution may be advantageous as compared with the other.

Hereinafter, the structure of the lens 140 for achieving the rectangular illumination distribution will be described in order.

<Structure of lens for achieving asymmetric roughness distribution - Incident surface including prism surface>

16 is a side sectional view of the lens 140 in which the incident surface 143 is composed of only the prism surface 142 and the emitting surface 145 is flat and FIG. 17 is a sectional view of the illumination unit 100 including the lens 140 in FIG. FIG. 8 is a view showing a spatial light distribution by the light source.

17, the distribution of light when viewed from the front of the illumination unit 100 in the X-axis direction is shown as B2, and the distribution of light when the illumination unit 100 is viewed from the front in the Y- appear. Here, the reason that B2 is wider than B1 is that the light is diffused in the Y-axis direction by the prism surface 142. Therefore, this asymmetric roughness distribution is closer to a rectangular shape than a circular roughness distribution. However, since the prism surface 142 causes the light to spread outward, the central portion of the illumination unit B2 in the X-axis direction is relatively darker than the other irradiation surfaces. Also, when viewed in the Y-axis direction (B1), the width is narrow and the central portion is relatively darker than other irradiation faces.

Thus, in the lens 140 in which the incident surface 143 is composed of only the prism surface 142 and the emission surface 145 is flat, the illuminance distribution is not uniform. Further, when a plurality of illumination units 100 are used, many overlapping portions of light are unnecessarily generated. When a portion where light is overlapped and wasted is reduced, a dark dead zone is generated, It becomes difficult to operate.

Accordingly, the structure of the lens 140 capable of compensating for the degraded illuminance at the central portion of the illuminating surface will be described in which the illuminating surface 145 is formed of the spherical lens 140.

 &Lt; Structure of a lens capable of compensating for the illuminance at the center of the irradiation surface - Lens having the exit surface of the spherical surface &

18 is a side sectional view of the lens 140 in which the incident surface 143 is composed of only the prism surface 142 and the emitting surface 145 is in the form of a spherical lens, 20 is a view showing the illuminance distribution by the illumination unit 100 including the lens 140 of FIG. 18. FIG.

17 and 19, there is an improvement in the intensity of the light B1 when viewed from the Y-axis as compared to the lens 140 with the emission surface 145 being flat. When viewed from the X-axis, It can be seen that the intensity of the light in the first embodiment is remarkably improved. However, the intensity of the light at the center is still weak, and referring to Fig. 20, the illuminance distribution on the irradiation surface still has the form of a dumbbell or a butterfly wing. As a result, since the lens 140 having only the prism surface 142 and the lens 140 having the exit surface 145 of the spherical surface can not attain the irradiation distribution close to the rectangle, It is necessary to consider a lens 140 in which a tongue 141 is formed.

&Lt; Lens having a groove surface on an incident surface >

The overall configuration of the lens 140 in which the concave surface 141 is formed on the incident surface 143 and the configuration of the illumination unit 100 including such a lens 140 will be described first. 21 is a perspective view of the lens 140 in which the incident surface 143 is composed of the prism surface 142 and the valley surface 141 and the emitting surface 145 is in the shape of a spherical lens, 23 is a plan view of the lens 140 having the prism surface 142 and the trough surface 141 and the exit surface 145 being a spherical lens shape. And FIG. 24 is a view showing the optical path of the light emitted from the LED 120 of the illumination unit 100 of FIG. 1 .

Referring to FIGS. 1 and 21 to 23, a lens 140 is disposed on the light emitting portion 101. The lens 140 includes an incident surface 143 and an exit surface 145, and a trough surface 141 and a prism surface 142 are formed on the incident side. A circular edge 144 is formed around the incident surface 143 of the lens 140. The lens 140 may be injection molded using a light-transmitting material. The material of the lens 140 may be a plastic material such as glass, poly methyl methacrylate (PMMA), and polycarbonate (PC).

It is preferable that the entrance surface 143 is perpendicular to the optical axis and the trough surface 141 intersects the entrance surface 143 and the trough surface 141 passes the center of the entrance surface 143. Referring to FIGS. 1 and 22, it can be seen that the trough surface 141 is formed in the direction of the axis X perpendicular to the optical axis Z. FIG. The cross section cut into the plane (YZ plane) perpendicular to the longitudinal direction of the trough surface 141 may be an arc shape, or may be a shape of a parabola, a hyperbola, or a part of an ellipse. As a result, when viewed from the entrance surface 143, the trough surface 141 has a round shape, and more specifically, when the cylinder is cut into a plane parallel to the longitudinal direction of the cylinder, it takes the shape of a concave surface of the cut cylinder. In addition, the width D4 of the trough 141 may be 9% to 40% of the diameter D6 of the incident surface.

A prism surface 142 is formed on both sides of the valley surface 141. Each concavity and convexity forming the prism surface 142 is formed to extend in the direction of the axis X perpendicular to the optical axis Z and each concavity and convexity is perpendicular to the longitudinal direction X of the trough surface 141 Are arranged in order along the direction (-Y, + Y) perpendicular to the optical axis (Z). When the plurality of irregularities forming the prism surface 142 are cut into a plane YZ perpendicular to the longitudinal direction of the trough surface 141, the cross section of each irregular surface becomes a triangle. Both sides (S1, S2) of the triangular concavo-convex pattern may have the same length or different angles.

In addition, the interval between the concavities and the convexities of the prism surface 142 may be formed to be uniformly spaced or denser toward both sides (-Y axis, + Y axis). This density may vary depending on the distribution of light.

The prism surface 142 is disposed between the trough surface 141 and the edge 144. The prism surfaces 142 are arranged in both lateral directions (e.g., -Y, + Y) orthogonal to the longitudinal direction of the trough surface 141 so that the light distribution in the left / right (-Y, + Y) Can be increased.

The exit surface 145 may reflect or refract the incident light and emit it to the outside. The exit surface 145 may be formed of an aspheric lens or a spherical lens, and such an aspheric lens or spherical lens shape may be selected in consideration of the light distribution and the illuminance distribution.

The reflected light is converted into the light emitting angle through at least one of the prism surface 142, the reflecting portion 132 and the upper surface of the substrate 110 without being emitted to the outside at the emitting surface 145, .

Referring to FIG. 24, among lights L1, L2 and L3 emitted from the LED 120 located at the outermost portion of the light emitting portion 110, L1 and L2 pass through the prism surface 142 and the exit surface 145 L3 is reflected by the prism surface 142 of the lens 140 and sequentially passes through the reflecting portion 132, the prism surface 142, the emitting surface 145, the prism surface 142, And is emitted through the exit surface 145.

A part of the light L4 emitted from the LED 120 in the center of the light emitting part 110 is refracted through the trough 141 of the lens 140 and dispersed and emitted to the outside through the exit surface 145.

Since the structure of the lens 140 in which the concave surface 141 is formed on the incident surface 143 and the structure of the illumination unit 100 including such a lens 140 has been studied, .

Fig. 25 is a diagram showing a spatial light distribution by the illumination unit 100 using the lens 140 of Fig. 21, and Fig. 26 is a diagram showing the illumination distribution by the illumination unit 100 using the lens 140 of Fig. 21 Fig. 25, the distribution of the light when the illumination unit 100 is viewed from the front in the X-axis direction is shown as B2, and the distribution of the light when the illumination unit 100 is viewed from the front in the Y- appear. Here, the reason that B2 is wider than B1 is that the light is diffused in the Y-axis direction by the prism surface 142. However, unlike in FIG. 19, the lens 140 is formed with the groove surface 141, which shows that the distribution of the spatial light in the X and Y axes is improved. That is, the distribution of light in the region around the optical axis Z is remarkably larger than that in Fig. Further, when viewed in the Y-axis direction (B1), the width is wide and the light is irradiated more on the irradiation surface as compared with FIG. 19, and when viewed in the X-axis direction (B2) The phenomenon of formation of a relatively dark area is significantly reduced compared to the irradiation surface.

Referring to FIG. 26, when the light is irradiated through the lens 140, the irradiated area of the surface on which the light is reflected has an approximate rectangular shape close to a rectangle. Such a shape is clearly different from a shape such as a dumbbell or a ribbon as shown in Fig. As in FIG. 17, the diffusion of light in the Y-axis direction is an effect of the prism surface 142, and the light is irradiated so that the region around the X-axis is not dark. In contrast to the lens 140 shown in Fig. 18, the trough surface 141 in addition to the lens in Fig. 21 serves as a rough surface for compensating the illuminance in the central region of the irradiation surface.

Referring to Fig. 23, the case where the exit surface 145 is a spherical lens or an aspheric lens will be described in detail. Where h1 is the thickness of the prism surface 142, h2 is the thickness of the edge 144, h3 is the thickness of the lens 140, D3 is the spacing between adjacent prisms, D4 is the width of the trough surface 141, S1 is the one surface in the cross section of the prism surface 142 and S2 is the other surface in the cross section of the prism surface 142. The width of the lens 140 excluding the surface 144 of the prism surface 142, r is the radius of curvature of the exit surface 145, The expression for the exit surface 145 of the spherical lens shape is expressed by Equation (1) below.

의 관계를 만족하며, z는 입사면(143)에서 출사면(145)까지의 높이, D6는 엣지(144)를 제외한 렌즈(140)의 폭, r은 출사면(145)의 곡률반경을 나타낸다. In Equation (1)

, Z represents the height from the incident surface 143 to the exit surface 145, D6 represents the width of the lens 140 excluding the edge 144, and r represents the radius of curvature of the exit surface 145 .

The expression for the exit surface 145 of the conical surface lens shape is expressed by Equation (2) below.

의 관계를 만족하며, z는 입사면(143)에서 출사면(145)까지의 높이, D6는 엣지(144)를 제외한 렌즈(140)의 폭, r은 출사면(145)의 곡률반경, k는 원추계수(conic constant)를 나타낸다.In Equation (2)

, Z is the height from the incident surface 143 to the exit surface 145, D6 is the width of the lens 140 excluding the edge 144, r is the radius of curvature of the exit surface 145, k Represents a conic constant.

The expression for the exit surface 145 of an aspherical lens shape is expressed by Equation (3) below.

은 비구면 계수값을 나타낸다.The symbols in Equation (3) are the same as in Equation (2), and additionally

Represents an aspherical coefficient value.

Any shape of the exit surface 145 that satisfies Equations (1), (2), and (3) can be any spherical or aspherical surface. In particular, it depends on the value of the cone coefficient k in Equation (2). When k = 0, it is a sphere, -1 <k <0 is an ellipse, k = -1 is a parabola, k <-1 is a hyperbola, k > 0, it becomes a spherical surface.

There are many cases where the emission surface 145 satisfies these equations, and the efficiency of the lighting unit will be examined according to each case, for example, by taking a few examples. In order to examine the efficiency of the lighting unit 100, simulation data using a computer program called an FTE calculator will be taken as an example. The purpose of the simulation with this computer program is to acquire the energy star certification, Verification. Therefore, energy star authentication and simulation data will be discussed below.

<Review of energy efficiency of energy star certification and inspection>

Energy star is a national symbol for energy efficiency in the United States. It is a joint program between DOE (Energy Sustainability) and EPA (Environmental Protection Agency) in the United States. It is the "ENERGY STAR" mark . Obtaining the Energy Star certification can contribute to enhance the merchantability of the product because the consumers in the US have a high preference for products that have earned the Energy Star Mark and the merit of obtaining Energy Star Marks for each US local government .

Lighting devices that have earned the ENERGY STAR certification mean that you can use less power to illuminate the area you want to illuminate with the required illumination, and you can also reduce the number of lighting devices you need. .

Since the lens 140 shown in the embodiment disclosed in relation to the present invention is a lens 140 used in the illumination unit 100 mounted on the outdoor lighting such as a street lamp or an outdoor lamp, Outdoor Area & Parking Garage. In order to confirm whether or not this criterion is satisfied, a computer program called FTE Calculator is used, and it is obvious to those skilled in the art that the computer program can be easily obtained.

FIG. 27 is a diagram showing the illuminance distribution of the irradiation surface according to the FTE calculator. FIG.

27, Rt is a rectangular target, UP is a Uniform Rectangle, UR is a Uniform Rectangle, Sideward is + Y, -Y direction illumination distribution, Forward is an illumination distribution in the + X direction, . The simulation data to be examined are based on the illuminance distribution of the illuminated surface when the light source is at a height of 10 m. In FIG. 27, the width of each lattice shows 10 m in both the horizontal and vertical directions. For example, if the Sideward is 2.5, it means that the illumination distribution occurs in a space of 25 m in the + Y direction and 25 m in the -Y direction on the irradiation surface. It is the simulation data assuming that Unshielded is based on the outdoor area & parking garage in category A of the energy star, and the luminaire output is about 9000 lumens (lm). In this case, The FTE (lm / W) value to be satisfied should be 53. The input power was measured at 120W. (UR) is wide and the ratio of the area occupied by the uniform pool (UP) in the area of the rectangular target (RT) of the irradiated face is high and the ratio of the rectangular target (RT) The wider the Sideward in both the Rectangular (UR), the more efficient the lighting system. Hereinafter, Covered will be described in detail. For example, it is assumed that the highest illuminance maximum illuminance value is 30 and the minimum illuminance value is 1 among the illuminated regions irradiated with the light emitted from the illumination device. Here, 30 and 1 represent the ratio of two values, not absolute values. Then, an area S1 satisfying the illuminance value of 1 to 30 is specified. When the average illuminance value in the specified region S1 exceeds 6, which is six times the minimum illuminance value 1, the region having the illuminance value of 1 is excluded.

If the lowest illuminance value is 1.1 after excluding the area having the illuminance value of 1, the illuminated area becomes the area S2 that satisfies the illuminance value of 1.1 to 30 inclusive. If it is determined that the average illuminance value at step S2 is larger than 6.6, which is six times the minimum illuminance value 1.1, and it is not more than 6.6, S2 is specified as a uniform pool (UP). If it exceeds 6.6, the above process is repeated until the average roughness value does not exceed 6 times the minimum roughness value, and Sn is specified as a uniform pool (UP). A rectangle enclosing the specified Sn in this way is called a rectangular target (RT). Finally Covered expresses the value of (UP / RT) * 100.

Simulation data were measured based on these assumptions and numerical values. However, the required FTE value, Covered, and effective shape may vary depending on the use of the lighting apparatus, the installation height, the input voltage, and the output light intensity. For example, the numerical values used in the simulation are illustrative, so the FTE calculator may measure the unshielded type, and the required FTE values may be other values such as 37, 48, and 70.

In each experiment, h1 was unified to 1 mm, h3 to 14.6 mm and D6 to 45 mm. The r was 24.64 mm when the exit surface 145 was a spherical lens and r was 17 mm when the aspheric lens was used. Conical coefficients corresponding to the hyperbola are used when the exit surface 145 is an aspherical surface, and only values of C ₄ , C ₆ , and C ₈ , which are meaningful for determining the shape of the lens 140, are applied to the aspherical surface coefficient values. Here, C ₄ was -9.7407e- ⁸ , C ₆ was 4.1275e- ⁸ , and C ₈ was -4.1969e ^-12 .

In Experiment 1, the exit surface 145 has a spherical lens shape, and there is no gutter surface 141. In this case, Coverd is 76%, FTE (lm / W) is 53, Forward and Backward of FTE (Rectangular Target) Sideward is 2.6, FTE (Uniform Target) is Forward and Backward is 0.9 and Sideward is 2.0.

In Experiment 2, the exit surface 145 is a spherical lens shape, the radius of curvature of the valley surface 141 is 5 mm, the width of the valley surface 141 is 8 mm, Coverd is 84%, FTE (lm / W) 58, Forward and Backward of FTE (Rectangular Target) is 1.7, Sideward is 2.6, FTE (Uniform Target) is Forward and Backward is 1.3 and Sideward is 2.1.

In Experiment 3, the exit surface 145 is an aspheric lens shape, and there is no gutter surface 141. In this case, Coverd is 81%, FTE (lm / W) is 55, Forward and Backward of FTE (Rectangular Target) is 1.8, Sideward is 2.5, FTE (Uniform Target) is Forward and Backward is 0.9 and Sideward is 2.0.

In Experiment 4, the exit surface 145 is an aspherical lens shape, the radius of curvature of the valley surface 141 is 2 mm, the width of the valley surface 141 is 4 mm, and Coverd is 85% and FTE (lm / W) 58, Forward and Backward of FTE (Rectangular Target) is 1.7, Sideward is 2.5, FTE (Uniform Target) is Forward and Backward is 1.3 and Sideward is 2.1.

In Experiment 5, the exit surface 145 is an aspherical lens shape, the radius of curvature of the valley surface 141 is 5 mm, the width of the valley surface 141 is 8 mm, and Coverd is 88% and FTE (lm / W) 60, Forward and Backward of FTE (Rectangular Target) is 1.6, Sideward is 2.5, FTE (Uniform Target) is Forward and Backward is 1.3 and Sideward is 2.1.

In Experimental Example 6, the exit surface 145 is an aspheric lens shape, the radius of curvature of the valley surface 141 is 9.2 mm, the width of the valley surface 141 is 12 mm, Coverd is 83%, FTE (lm / W) 57, Forward and Backward of FTE (Rectangular Target) is 1.6, Sideward is 2.4, FTE (Uniform Target) is Forward and Backward is 1.2 Sideward is 2.0.

In Experiment 7, the exit surface 145 is an aspherical lens shape, the radius of curvature of the valley surface 141 is 12 mm, the width of the valley surface 141 is 16 mm, and Coverd is 89% and FTE (lm / W) 61, Forward and Backward of FTE (Rectangular Target) is 1.4, Sideward is 2.1, and Forward and Backward of FTE (Uniform Target) is 1.2 and Sideward is 1.7.

Table 1 shows the results of these experiments.

Curvature radius / width of trough surface
(mm) Exit surface shape The minimum width (m) in the X-axis direction of the 10% Maximum width in the Y-axis direction of the 10% area of maximum illumination (m) Rectangular Target (FTE) FTE (Uniform Rectangle) Forward Sideward Backward Coverd (%) Forward Sideward Backward One none Spherical 10 22 1.9 2.6 1.9 76 0.9 2.0 0.9 2 5/8 Spherical 11 22 1.7 2.6 1.7 84 1.3 2.1 1.3 3 none Aspherical surface 10 23 1.8 2.5 1.8 81 0.9 2.0 0.9 4 2/4 Aspherical surface 12 23 1.7 2.5 1.7 85 1.3 2.1 1.3 5 5/8 Aspherical surface 12 23 1.6 2.5 1.6 88 1.3 2.1 1.3 6 9.2 / 12 Aspherical surface 14 23 1.6 2.4 1.6 83 1.2 2.0 1.2 7 12/16 Aspherical surface 15 20 1.4 2.1 1.4 89 1.2 1.7 1.2

28 is a view showing a spatial light distribution by the illumination unit 100 using the lens 140 of Experimental Example 5 and FIG. 29 is a graph showing the illuminance distribution of the illumination unit 100 using the lens 140 of Experimental Example 5 Fig. 28, the distribution of light when the illumination unit 100 is viewed from the front in the X-axis direction is represented by B2 and the distribution of light when the illumination unit 100 is viewed from the front in the Y-axis direction is represented by B1 appear. 29, it can be seen that the illuminance distribution in the Y-axis direction is much wider than the illuminance distribution in the X-axis direction, and the illuminance distribution is close to a rectangle. 28 and Fig. 25, there is no phenomenon in which the light is lacking due to insufficient light at the central portion of the irradiation surface in both Figs. 28 and 25, but Fig. 25 shows that the light in the central portion is excessive It can be seen that the light is not uniformly distributed over the entire irradiation surface. On the other hand, FIG. 28 shows that the light in the central portion of the irradiation surface is smaller than that in FIG. 25, and thus the illumination distribution is uniformly distributed over the entire irradiation surface.

28 and 29 and the data values of Experimental Example 5 discussed above, the most efficient example among the above experimental examples is Experimental Example 5. [ In Experiment 5, the Sideward of the FTE (Rectangular Target) is 2.5, the Sideward of the FTE (Uniform Target) is 2.1, the upper numerical value is shown in the experimental example, the Coverd is the extreme value of 88%, and the FTE (lm / W) 60, respectively. Therefore, it is preferable to use the lens 140 having the numerical value corresponding to Experiment 5.

However, as discussed above, the criteria for evaluating the efficiency of the lens 140 are various, such as Sideward's width, Coverd, and FTE (lm / W) values, and Experiment 5 does not show an absolute advantage in all standards. Therefore, when the actual lighting device is used, any one of the Sideward width, Coverd, and TE (lm / W) may be important. In this case, it is possible to use another experiment example other than Experiment Example 5 or Experimental Example 2 The lenses 140 other than Examples 4 to 7 can exhibit higher efficiency. In the case of the illumination unit 100 used in a streetlight, outdoor, etc., outdoors, the illumination unit 100 has a spherical or aspherical lens-shaped exit surface 145, and the entrance surface 143 has a prism surface 142 and a trough surface 141 And the lighting unit 100 having the lens 140 whose width is 9% to 40% of the incident side diameter of the lens 140 is higher in efficiency than a general lighting unit It should be understood that the lens 140 having such a characteristic is all within the scope of the present invention. In addition, the lens 140 of the present experimental example and the lens 140 equivalent thereto can also be used for the illumination unit 100, which is desirable to have an illuminance distribution close to a rectangle even in applications other than street lamps and outdoors.

<Embodiment of Lighting Unit Using Lens Having Spherical or Aspherical Lens Exiting Surface and a Ball Surface and Prism Surface on Incident Surface>

30 is a side sectional view showing the illumination unit 100A according to the second embodiment. In describing the second embodiment, the same parts as those of the first embodiment will be referred to in the first embodiment, and redundant description will be omitted.

Referring to Fig. 30, the illumination unit 100A includes a light emitting portion 101, a lens 140, and a gap member 130. Fig. The gap member 130 may be formed in an annular shape using an epoxy or a silicone resin material and may be in contact with the edge of the upper surface of the substrate 110 of the light emitting portion 101 and the lower surface of the edge 144 of the lens 140 / RTI &gt; Therefore, it is positioned between the substrate 110 and the lens 140, and the substrate 110 and the lens 140 are separated from each other by a predetermined gap G1. The space 105 formed by the gap member 130 can improve the light directivity distribution of the LED 120 of the light emitting portion 101. [

On the other hand, a phosphor may be added to the gap member 130 when necessary. A reflective material may be coated on the upper surface of the substrate 110 of the light emitting portion 101 to reflect light traveling to the substrate 110.

31 is a side cross-sectional view showing the illumination unit 100B according to the third embodiment. In describing the third embodiment, the same parts as those of the first embodiment will be referred to in the first embodiment, and redundant description will be omitted.

31, the edge 144A of the lens 140 protruding downward toward the light emitting unit 101 is substituted for the gap member 130 in the illumination unit 100B. The edge 144A of the lens 140 may be disposed in contact with the upper surface edge of the substrate 110 of the light emitting portion 101 or may be disposed on the upper surface of the substrate 110 of the light emitting portion 101, As shown in Fig.

The edge 144A of the lens 140 separates the substrate 110 of the light emitting portion 101 from the lens 140 at a predetermined interval G1.

The space 105 between the light emitting portion 101 and the lens 140 may be filled with a resin such as silicone or epoxy, and a phosphor may be added to the resin.

The substrate 110 of the light emitting portion 101 is disposed below the edge 144A of the lens 140 and the lens edge 144A has a stepped shape with respect to the incident surface 143. [ As another example, protrusions may be formed on the outer circumference of the upper surface of the substrate 110 to maintain a gap with the lens 140.

32 is a side sectional view showing the illumination unit 100C according to the fourth embodiment. In describing the fourth embodiment, the same reference numerals are given to the same portions as in the first embodiment, and redundant description will be omitted.

32, a reflection plate 155 is disposed on the substrate 110 of the light emitting portion 101 of the illumination unit 100C. The reflective plate 155 is disposed so as to cover the area other than the area where the LED 120 is exposed on the substrate 110 with the LED hole 155A so as not to cover the LED 120. [ Therefore, a part of the light emitted from the LED 120 can be reflected by the reflection plate 155, thereby increasing the amount of reflected light, and the light efficiency can be improved. The reflective plate 155 does not have to be a member separate from the substrate 110 and the upper surface of the substrate 110 may be replaced with the reflective plate 155 by using the substrate 110 having a high reflectivity on the upper surface. Further, a diffusion agent may be applied to the upper surface of the reflection plate 155.

A gap member 153 is disposed between the substrate 110 and the edge 144 of the lens 140 so that the substrate 110 and the lens 140 are spaced apart from each other by a predetermined gap G1. A space 105 is formed between the lens 140 and the substrate 110 and the light emitted from the LED 120 is dispersed in the space 105 between the substrate 110 and the lens 120, The light can be dispersed through the prism surface 142 and the trough surface 141 of the lens 140.

32, and a fifth embodiment (not shown) using the gap member 130 described in the first embodiment instead of the gap member 130 of the fourth embodiment is also available . In the fifth embodiment, both the withstand voltage characteristics and the light efficiency are improved in the same manner as the effect of the gap member 130 described in the first embodiment, and the reflection plate 155 used in the fourth embodiment is used The light efficiency can be further improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications other than those described above are possible. For example, each component specifically shown in the embodiments of the present invention can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

100: Lighting unit
101:
130: gap member
140: lens
141:
142: prism face
143: incidence plane
145: exit surface

Claims (6)

A light emitting portion including a substrate and a plurality of LEDs arranged on the substrate;
A lens disposed on the light emitting portion; And
And a gap member disposed between the light emitting unit and the lens and spaced apart from the substrate by a predetermined distance,
Wherein the gap member comprises:
A ring-shaped wall portion including an upper surface; And
And a reflective portion having an opening portion through which the plurality of LEDs are exposed, the downward inclined surface being formed in a direction from the upper surface of the wall portion toward the center of the opening portion,
Wherein the gap member includes an inner surface having a flat portion at a portion thereof,
Wherein the substrate includes an outer peripheral surface having a flat portion corresponding to the flat portion of the gap member,
And the flat portion of the inner side surface of the gap member and the flat portion of the substrate are arranged in the same direction.
The method according to claim 1,
Wherein the diameter of the substrate is smaller than the diameter of the gap member.
The method according to claim 1,
Wherein the gap member includes an outer surface having a flat portion at a portion thereof and a flat portion at an outer surface of the gap member is parallel to a flat portion at an inner surface of the gap member.
A light emitting portion including a substrate and a plurality of LEDs arranged on the substrate;
A lens disposed on the light emitting portion; And
And a gap member disposed between the light emitting unit and the lens and spaced apart from the substrate by a predetermined distance,
Wherein the gap member comprises:
A ring-shaped wall portion including an upper surface; And
And a reflective portion having an opening portion through which the plurality of LEDs are exposed, the downward inclined surface being formed in a direction from the upper surface of the wall portion toward the center of the opening portion,
Wherein the substrate is disposed in the wall portion,
Wherein the reflective portion of the gap member includes a bottom surface in contact with an edge of an upper surface of the substrate,
And the wall portion of the gap member includes an inner surface in contact with the outer circumferential surface of the substrate.
The method according to claim 1 or 4,
Wherein the light emitting unit includes a wire or a lead electrode for supplying power to the plurality of LEDs,
Wherein the gap member includes an electrode passage through which the electric wire or the lead electrode can pass.
The method according to claim 1 or 4,
And a reflection plate disposed on the substrate of the light emitting portion,
Wherein the reflection plate has a plurality of holes in which the plurality of LEDs are arranged.

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