TWI382141B - Reflective cover and illumination device - Google Patents

Description

Reflector and lighting device

The invention relates to the field of illumination, in particular to a reflector and a light-emitting diode illumination device.

For a lighting device using a light-emitting diode as a light-emitting element, in order to make the output light have a specific light field shape to meet the requirements of the illumination field shape in practical applications, it is usually necessary to provide a reflector to output the light-emitting diode. The field shape of the light is adjusted; in addition, the illumination device needs a mask to cover the opening of the reflector to protect the LED from damage by foreign objects. However, due to the limited field shape produced by a generally spherical or square reflector, the current multi-element field shape requirements cannot be met, for example, street lamps require a rectangular field shape. Therefore, it is necessary to provide a light-emitting diode lighting device to adapt to the diverse and diverse light field shape requirements.

In the following, an embodiment of a light-emitting diode illumination device having a preferred illumination light field shape will be described by way of example.

A reflector includes a plurality of side panels, the plurality of side panels surrounding a truncated pyramid structure having a first opening and a second opening. The first opening and the second opening are respectively enclosed by the end portions of the plurality of side plates, and the inner side surfaces of the plurality of side plates are reflective surfaces, and the area of the first opening is larger than the area of the second opening. The first opening is a polygon, and the polygon includes two parallel sides parallel to each other, and adjacent edges of the two parallel sides respectively have a plurality of oblique sides connected end to end, and the plurality of oblique sides are located Quadrilateral determined by four vertices of two parallel sides On the outer side, the length of the line segment intersected by any straight line parallel to the two parallel sides and the plurality of oblique sides of the polygon is smaller than the distance between the two parallel sides, and the second opening is used for setting the light emitting diode Body light source.

A lighting device includes a reflector as described above, at least one light emitting diode light source, and a light shield. The at least one light emitting diode light source is disposed at the second opening, and the light cover is disposed at the first opening to cover the reflective cover. The reticle is provided with an optical microstructure, and the light emitted by the at least one illuminating diode source is finally emitted through the reticle, and the optical microstructure is used for diverging the light.

Compared with the prior art, the opening of the reflector has a polygonal shape, and the length of the line segment intersected by any straight line parallel to the two parallel sides and the plurality of oblique sides of the polygon is smaller than the length between the two parallel sides. a distance, so that when used in an illumination device, an elongated light field can be formed; in addition, the other sides except the two parallel sides are located outside the quadrilateral defined by the four vertices of the two parallel sides, and are used for illumination. When the device is installed, the light emitted by the illumination device can be more reflected, the reflection efficiency is higher, and the formed light field is larger.

The illumination device can obtain a long strip-shaped light field with a larger light field by using the above-mentioned reflector, and is more suitable for application to a strip light field such as a street lamp.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

1 to 3, a lighting device 100 according to a first embodiment of the present invention includes a reflector cover 120, two light emitting diode light sources 140, and a light. Cover 160.

The reflector cover 120 includes six side plates 122. The six side plates are surrounded by a truncated hexagonal cone having an opening 126 at one end and a bottom plate 124 at the other end. The inner side of the six side plates 122 is a reflecting surface 128, and the surface of the bottom plate 124 facing the inside of the reflecting cover 120 is a bearing surface 130. The area of the bearing surface 130 is smaller than the area of the opening 126, and the light emitted by the LED light source 140 passes through The opening 126 is emitted to the outside.

The shape of the bearing surface 130 and the opening 126 are two similar hexagons. Here, the hexagon of the opening 126 is taken as an example for description. The hexagon is bilaterally symmetric with a line connecting two vertices as an axis of symmetry O ₁ , the hexagon having two sides parallel to the axis of symmetry O ₁ , and a distance D1 between two sides parallel to the axis of symmetry O ₁ , The length D2 of the line connecting the two vertices in the symmetry axis O ₁ , and D1>D2, can be considered as a long strip shape, and the length direction and the axis of symmetry of the strip shape The O ₁ phase is perpendicular; in addition, the two sides parallel to the axis of symmetry O ₁ define a quadrilateral, and the two vertices located in the axis of symmetry O ₁ are located outside the quadrilateral, so the other four sides of the hexagon form a convex shape of the quadrilateral. structure. The six reflecting surfaces 128 are inclined from the opening 126 toward the carrying surface 130 for reflecting the light of the LED light source 140 to the outside. In this embodiment, the reflecting surface 128 is a flat surface.

The two light emitting diodes 140 are disposed on the supporting surface 130, and respectively adjacent to the bearing surface with two parallel symmetrical axis O ₁ of the above-described opposite sides of the 130, the emitted light of the light emitting diode 140 are The reflective surface 128 is reflected to the opening 126 of the reflector cover 120. Each of the light emitting diodes 140 includes one or a plurality of Light Emitting Diodes (LEDs).

The reticle 160 includes a transparent substrate 162 and an optical microstructure 164 attached to a surface of the transparent substrate 162. Preferably, the transparent substrate 162 is identical to the material of the optical microstructure 164 and is integrally formed. The optical microstructure 164 is used. To spread the light. The reticle 160 is disposed on the opening 126 of the reflector 120. The edge of the reticle 160 is fixedly coupled to the end of the reflector 120 at the opening 126. This embodiment is adhesively fixed. The optical microstructure 164 includes two sets of concentric annular prism sets 166 and 168. The two concentric annular prism sets 166 and 168 are identical. Here, only the concentric annular prism set 166 will be described as an example. The concentric annular prism group 166 includes a plurality of concentric annular prisms 1662 having a central axis O ₂ , and the circular prism 1662 has a triangular cross section along a radial direction of the ring, and the bottom edge of the triangle is transparent. The surface of the substrate 162 has a length of the bottom side of the order of millimeters, and preferably the length of the bottom side ranges from 1 mm to 1 cm. The two base angles corresponding to the bottom edge are α and β, respectively, wherein the bottom angle α is close to the central axis O ₂ , and the bottom angle β is away from the central axis O ₂ , where α<β, so that more light can be made diffusion. The distance between adjacent annular prisms 1662 is gradually increased in a direction away from the central axis O ₂ so that the light emitted from the illumination device 100 is more uniform, and the distance between adjacent annular prisms 1662 ranges from 1 mm to 1 cm. The central axes of the concentric annular prism groups 166 and 168 are O ₃ . Preferably, the central axes O ₂ and O ₃ are respectively opposite to the two light emitting diode light sources 140, and the center lines of the centers O ₂ and O ₃ and their corresponding light emitting diode light sources 140 are perpendicular to the transparent substrate 162 , respectively. The surface.

The other surface of the transparent substrate 162 opposite to the optical microstructure 164 has two arcuate recesses 170 and 172, and the recesses 170 and 172 are respectively opposite to the two LED light sources 140, the two recesses Department 170 and The shape of 172 may be a partial spherical surface, a partial cylindrical surface or an aspheric surface. The recesses 170 and 172 function to diffuse light entering the transparent substrate 162.

As shown in FIG. 4, since the opening 126 of the reflector cover 120 has a hexagonal shape and the hexagonal shape is elongated, an elongated light field is formed, so that the illumination device 100 can be applied to a street lamp, and the reflector 120 can be used. The length direction is parallel to the direction of the road, allowing more light to be used to illuminate the road. In addition, since the hexagon can be regarded as being formed in a shape in which the opposite sides further have a convex structure on the opposite sides (as described above), the light emitted from the illumination device 100 can be more reflected, and the reflection efficiency is higher. The light field formed is larger. Further, due to the diffusion of the reticle 160, the light in the formed light field is more uniform. As shown in FIG. 5, the light distribution curve formed by the light emitted by the illumination device 100 forms a half-height full width shape.

As shown in FIG. 6, the shape of the reflecting surface of the connecting opening 226 and the bearing surface 224 may also be a partial cylindrical surface 222 which is a concave cylindrical surface. As shown in FIG. 7, the reflecting surface of the connecting opening 326 and the bearing surface 324 may also be two smooth free curved surfaces 322 composed of aspherical surfaces having an aspherical coefficient.

Referring to Figures 8 and 9, there are concentric annular prisms 266 and 366 of the reticle of the other two embodiments. As shown in FIG. 8, the circular prism 266 has a section along the radial direction of the ring similar to the section of the annular prism 1662 shown in FIG. 3, except that it is close to one side of the center of the annular prism. It is replaced by a convex arc line 2662. As shown in FIG. 9, the circular prism 366 has a section along the radial direction of the ring similar to the section of the annular prism 1662 shown in FIG. 3, except that it is close to the center of the annular prism 366. One of the sides is replaced by a plurality of fold lines 3662 composed of a line segment that is connected end to end, and the fold line 3662 composed of the plurality of end-to-end line segments forms a convex shape, so that the cross-sectional shape of the annular prism 366 becomes a larger number of sides. Three polygons. When the annular prisms 266 and 366 are formed by a mold, the end portion is more blunt due to the convex arc 2662 and the convex fold line 3662, which makes the demolding easier and avoids accidental damage of the tip.

The annular prism sets 166 and 168 of the optical microstructure 164 described above may also be non-concentric. As shown in FIG. 10, another embodiment of the annular prism set 268 is provided. The annular prism set 268 includes a plurality of different radii. The ring, and the plurality of rings are arranged in turn according to their radius, that is, any two rings, and the ring with a small radius is set in the ring with a large radius. The center of the plurality of rings is on the same straight line L, and the center line of the plurality of rings is perpendicular to the axis of symmetry O ₁ .

Referring to FIG. 11, a lighting device 400 according to a second embodiment of the present invention includes a reflector (not shown), a light emitting diode source (not shown), and a mask 46. The structure of the reflector is similar to that of the reflector 120 of the first embodiment, except that the reflector has a structure different from that of the reflector 120, an opening shape, and a bearing surface shape, as described in detail below. The opening 426 of the reflector has a shape of a heptagonal shape having parallel opposite sides 430 and 432, and four end points of the parallel sides 430 and 432 define a parallelogram, three sides of the heptagon Connected end to end and located on one side of the parallelogram, the three sides form a structure protruding toward the outer side of the parallelogram; the other two sides of the heptagon are connected end to end and located on the opposite side of the parallelogram, the two sides are formed A structure that is convex toward the outer side of the parallelogram. With any line parallel to the sides 430 and 432 Through the heptagon, the length D3 of the line segment intercepted by the heptagon is smaller than the distance D4 between the two sides 430 and 432. The reticle 46 of the present embodiment is different from the reticle 160 of the first embodiment in that the reticle 46 has the same shape as the opening 426, and the reticle 46 includes a transparent substrate 462 and an optical microstructure attached to the surface of the transparent substrate 462. 464, the optical microstructure 464 is identical to the concentric annular prism set 166 of the first embodiment.

As shown in FIG. 12, the light field formed by the illumination device 400 has an elongated structure in the Y-axis direction, and the heptagonal shape can be regarded as being formed in a shape in which the opposite sides of the quadrilateral further have a convex structure (as described above). Therefore, the light emitted by the illumination device 400 can be more reflected, the reflection efficiency is higher, and the formed light field is larger. Further, due to the diffusion of the reticle 46, the light in the formed light field is more uniform.

In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, the changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100, 400‧‧‧ lighting devices

120‧‧‧reflector

140‧‧‧Lighting diode source

160‧‧‧Photomask

122‧‧‧ side panels

124‧‧‧floor

126, 226, 326, 426‧‧

130, 224, 324‧‧ ‧ bearing surface

128‧‧‧reflecting surface

1662, 266, 366‧‧‧ ring prism

162, 462‧‧‧ Transparent substrate

164, 464‧‧‧ optical microstructure

166, 168, 268‧‧ ‧ ring prism group

170, 172‧‧‧ recessed

222‧‧‧Partial cylindrical surface

322‧‧‧Freeform surface

2662‧‧‧Arc

3662‧‧‧Digital line

46‧‧‧Photomask

462‧‧‧Transparent substrate

464‧‧‧Optical microstructure

430, 432‧‧‧

1 is a perspective view of a lighting device according to a first embodiment of the present invention.

2 is a perspective exploded view of the lighting device shown in FIG. 1.

3 is a schematic cross-sectional view of the lighting device of FIG. 1.

4 is a simulation diagram of the shape of a light field generated by the illumination device shown in FIG. 1.

FIG. 5 is a light distribution diagram of the lighting device shown in FIG. 1. FIG.

Figure 6 is a schematic view showing a second embodiment of the reflector of the lighting device shown in Figure 1.

Figure 7 is a schematic view of a third embodiment of a reflector of the illumination device of Figure 1.

Figure 8 is a schematic view showing a second embodiment of the reticle of the illuminating device shown in Figure 1.

Figure 9 is a schematic view showing a third embodiment of the reticle of the illuminating device shown in Figure 1.

Figure 10 is a schematic view showing a fourth embodiment of the reticle of the illuminating device shown in Figure 1.

Figure 11 is a plan view of a lighting device in accordance with a second embodiment of the present invention.

Figure 12 is a light field analog view of the illumination device shown in Figure 11.

100‧‧‧Lighting device

120‧‧‧reflector

140‧‧‧Lighting diode source

160‧‧‧Photomask

122‧‧‧ side panels

124‧‧‧floor

126‧‧‧ openings

130‧‧‧ bearing surface

128‧‧‧reflecting surface

Claims (13)

A reflective cover comprising a plurality of side plates, the plurality of side plates surrounding a truncated pyramid structure having a first opening and a second opening, wherein the first opening and the second opening are respectively formed by the ends of the plurality of side plates Enclosed, the inner side of the plurality of side plates is a reflecting surface, the area of the first opening is larger than the area of the second opening, the first opening is a polygon, and the polygon comprises two parallel sides parallel to each other, the two The adjacent end points of the parallel sides respectively have a plurality of oblique sides connected end to end, and the plurality of oblique sides are located outside the quadrilateral determined by the four vertices of the two parallel sides to be parallel to the two The line segments intersected by any straight line of the parallel sides intersecting the polygon are smaller than the distance between the two parallel sides, and the second opening is used for setting the light emitting diode light source. The reflector of claim 1, wherein the inner surface of the plurality of side plates is a flat, concave partial cylindrical surface or a smooth free-form surface formed by connecting two aspherical surfaces. The reflector of claim 1, further comprising a bottom plate for carrying the light emitting diode light source, the bottom plate being disposed at the second opening. A illuminating device, comprising: a reflector according to claim 1; at least one light emitting diode light source; and a light cover, wherein the at least one light emitting diode light source is disposed at the second opening, the light a cover is disposed at the first opening to cover the reflective cover, the optical cover is provided with an optical microstructure, and the light emitted by the at least one light emitting diode source is finally emitted through the light cover, and the optical microstructure is used for the light Divergence. The lighting device of claim 4, wherein the plurality of lighting devices The inner surface of the side plate is a flat, concave partial cylindrical surface or a smooth free-form surface formed by connecting two aspherical surfaces. The lighting device of claim 4, further comprising a bottom plate for carrying the light emitting diode light source, the bottom plate being disposed at the second opening. The illuminating device of claim 4, wherein the reticle comprises a transparent substrate, the optical microstructure is formed on the surface of the transparent substrate, and the transparent substrate is disposed adjacent to the at least one light emitting diode light source. The illuminating device of claim 7, wherein the optical optical microstructure comprises a plurality of annular prisms having different radii, and any one of the plurality of annular prisms has a small radius The annular prism is disposed in a circular prism having a large radius, and the centers of the plurality of annular prisms are on the same straight line. The illuminating device of claim 7, wherein the optical microstructure comprises a plurality of concentric annular prisms. The illuminating device of claim 9, wherein the circular prism has a triangular cross section along a radial section of the center of the circle, and one of the bottom sides of the triangular section is located on a surface of the transparent substrate, and the bottom edge corresponds to Two bottom corners, wherein a bottom corner of the center of the plurality of concentric annular prisms is smaller than the other bottom angle. The illuminating device according to claim 9, wherein the circular prism has a shape along a radial section of the center of the circle, and the shape of the two line segments and the arc line are connected end to end. a convex circular arc line, one of the two line segments being located on a surface of the transparent substrate, the circular arc line being close to a center of the plurality of concentric annular prisms. The lighting device of claim 9, wherein the ring shape The contour of the prism along a radial section of the center of the circle is a second polygon having a side number greater than three, the second polygon includes a first side and a second side, the first side is located on a surface of the transparent substrate, The second side is connected to the end of the first side away from the center of the plurality of concentric annular prisms, and the other sides of the second polygon are connected end to end and the two ends are respectively opposite to the first side and the second side The other end is connected, and the shape of the line formed by the other side protrudes from the triangle defined by the end points of the first side and the second side. The illuminating device of claim 9, wherein the distance between the concentric annular prisms gradually increases from the center of the circle in the radial direction.