TWI429851B - Lighting module - Google Patents

Description

Lighting module

The present invention relates to a lighting module, and more particularly to a lighting module having a cymbal.

Existing methods for changing the light distribution curve of a lamp mainly use a lampshade to change the distribution of reflected light or scattered light, change the light source type and the light source angle of the light source itself, change the optical characteristics of the surface of the lamp, and use the grid to change the light distribution at a large angle. These kinds.

In detail, by reflecting or scattering the light beam through the lampshade of different shapes and surface optical characteristics, the irradiation direction of the light beam can be changed, thereby achieving the target light shape distribution. Regarding the method of changing the type of the light source, the bulb and the bulb belong to a less directional light source, and the light emitting diode (LED) may have a lens type and a primary lens type of the surface. Different angles of illumination. Since a light-emitting diode is used as a light source, a large number is usually required. Therefore, by selecting a light-emitting diode suitable for the divergence angle, there can be more variations in the arrangement.

In general, indoor lamp fixtures are equipped with a metal grille to block the beam at a large angle through the outermost grille. The denser or longer the grid, the smaller the illumination angle of the luminaire.

Conventional edge-lit planar light source modules typically use a light guide to direct the beam of light from the source. In general, an optical film is disposed above the light guide plate to adjust the light output shape of the planar light source, and generally common optical films are Used to enhance the effect of beam concentration, so if the lamp needs to strengthen the light intensity at a large angle, it is not easy to change the adjustment in this way, and in the use of the optical film in the light source module, there will be thin film interference between the optical films. phenomenon. In the current technology for solving the interference phenomenon between two smooth planes, most of them choose to change the surface material of one of the two smooth contact surfaces, or directly change the overall structure to solve such problems. However, these changes have a large impact on the optical properties of the luminaire, so the above method is not applicable to manufacturers who only want to make fine adjustments on the developed luminaires to improve the film interference phenomenon.

Taiwan Patent No. I274178 discloses a light source module in which a light beam provided by a light source is incident obliquely from the light guide plate to the optical film.

U.S. Patent No. 6,828,007 discloses the use of a microstructure on a wedge-shaped light guide plate to correct the beam so that the beam exits the light guide surface in a direction perpendicular to the light-emitting surface of the light guide plate. However, the above-mentioned light guide plate is complicated in the manufacturing process, and since the light guide plate is shaped after being shot, it is difficult to adjust the light output shape of the light source module.

In addition, U.S. Patent No. 4,071,750 also discloses a direct type luminaire comprising a diffuser disc and a fluorescent tube, wherein the diffuser has an irregular crucible structure for directly illuminating the fluorescent tube The emitted beam is deflected away from the center of the crucible structure. In this way, a non-uniform light source can generate uniform planar light after passing through the diffuser. However, the above method is complicated in the process, so the cost is high.

U.S. Patent No. 5,040,104 discloses a light source device that utilizes a helium structure to diffuse a beam of light from a linear source to reduce glare.

The present invention provides a lighting module that diverges a beam to enhance light intensity at a large angle.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

To achieve one or a part or all of the above or other purposes, an embodiment of the present invention provides a lighting module including at least one light emitting component, a light guide plate, and a die. The illuminating element is adapted to emit a light beam. The light guide plate has a light emitting surface, a first surface opposite to the light emitting surface, and a light incident surface connecting the light emitting surface and the first surface. The light emitting element is disposed beside the light incident surface. The light beam is adapted to enter the light guide plate via the light incident surface, and the traveling direction of the light beam to the outside of the light guide plate is substantially perpendicular to the light exit surface. The cymbal is disposed on the light guide plate. The cymbal includes a first substrate and a plurality of 稜鏡 structures, and the 稜鏡 structure is uniformly disposed on the first substrate adjacent to a second surface of the light-emitting surface of the light guide plate.

Based on the above, embodiments of the invention include at least one of the following advantages or benefits. In the illumination module of the embodiment of the present invention, since the cymbal is disposed above the light guide plate, and the 稜鏡 structure on the cymbal is disposed on a side close to the light guide plate, the light beam is substantially perpendicularly emitted outside the light guide plate. After passing through the cymbal, it can be diverged to produce an illuminating light pattern having a light intensity higher than that of the middle portion.

The above described features and advantages of the present invention will be more apparent from the following description.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

First embodiment

1 is a cross-sectional view of a lighting module 100 according to a first embodiment of the present invention. Referring to FIG. 1 , the lighting module 100 includes at least one light emitting element 110 (only one is schematically shown), a light guide plate 120 , and a cymbal sheet 130 . The light-emitting element 110 is adapted to emit a light beam L1. The light emitting element 110 is, for example, a light emitting diode (LED).

The light guide plate 120 has a light-emitting surface S1, a surface S2 opposite to the light-emitting surface S1, and a light-incident surface S3 that connects the light-emitting surface S1 and the surface S2. The light-emitting element 110 is disposed adjacent to the light-incident surface S3, and the light beam L1 is adapted to enter the light guide plate 120 via the light-incident surface S3, and is transmitted to the outside of the light guide plate 120 in a forward direction via the light-emitting surface S1, that is, the light beam L1 is emitted to the light guide surface. The traveling direction P1 outside the light plate 120 is substantially perpendicular to the light exit surface S1 (that is, the optical axis of the light beam L1 emitted to the outside of the light guide plate 120 is substantially perpendicular to the light exit surface S1). In the present embodiment, the light-emitting surface S1 of the light guide plate 120 is substantially parallel to the surface S2. That is, the shape of the light guide plate 120 of the present embodiment is rectangular, so that the manufacturing is simple, and the cost can be saved.

The cymbal sheet 130 is disposed on the light guide plate 120, and the cymbal sheet 130 includes a substrate 132 and a plurality of cymbal structures 134. The cymbal structure 134 is uniformly disposed on the substrate 132 near one surface S4 of the light exit surface S1. detailed In detail, the size, shape, and spacing of the crucible structures 134 of the present embodiment are substantially the same. In addition, since the configuration of the 稜鏡 structure 134 is toward the side of the light guide plate 120, the cymbal sheet 130 of the present embodiment is an inverted cymbal sheet which can achieve the effect of scattering the light beam L1.

As shown in FIG. 1 , the illumination module 100 of the present embodiment further includes a plurality of microstructures 122 , and the microstructures 122 are disposed on the surface S2 of the light guide plate 120 , wherein the microstructures 122 can adopt an unequal interval layout design. In detail, the number density of the microstructures 122 near the light-emitting elements 110 is less than the number density at a distance from the light-emitting elements 110 to achieve a uniform light output. In this embodiment, the size and shape of the microstructures 122 on the same surface S2 may be different or the same. The size, shape and position of the microstructures 122 can be designed according to actual needs, and the invention is not limited thereto.

The microstructures 122 of this embodiment are, for example, bumps, and the bumps are, for example, printed dots or fabricated using ink jet techniques. In addition, the microstructures 122 may further include a plurality of diffusion particles 122a, wherein the diffusion particles 122a are, for example, scattering materials such as cerium oxide (SiO ₂ ) or titanium dioxide (TiO ₂ ). The addition of the diffusion particles 122a facilitates the scattering of the light beam (e.g., the light beam L1), thereby increasing the uniformity of the light output. It should be noted that in other embodiments, the microstructures 122 may also have no diffusion particles 122a.

As shown in FIG. 1, when the light beam L1 is incident on the microstructure 122 on the surface S2 after several times of total reflection in the light guide plate 120, the microstructure 122 breaks the total reflection, so that the light beam L1 directly penetrates the surface S1 and transmits It is outside the light guide plate 120. Since the light-emitting surface S1 of the light guide plate 120 is substantially parallel to the surface S2, the light beam L1 may be substantially perpendicular to the direction of the light-emitting surface S1. Exposed to the outside of the light guide plate 120, the light guide plate 120 can provide a good uniform planar light source to the optical film at the rear end (for example, the cymbal 130). In addition, the light guide plate 120 of the simple rectangular structure can use the light guide plate 120 of the simple rectangular structure to emit light in a direction substantially perpendicular to the light exit surface S1 of the light guide plate 120 and generate a uniform planar light source, thereby saving manufacturing cost and facilitating mass production. The advantages.

2 is an enlarged schematic view showing the traveling of the light beam of FIG. 1 on the meandering structure of the marked area A. Referring to FIG. 1 and FIG. 2 simultaneously, further, when the light beam L1 is emitted in a direction substantially perpendicular to the light exit surface S1, the 稜鏡 structure 134 on the cymbal 130 refracts the light beam L1 so that the light beam L1 passes. The 稜鏡 structure 134 is deflected toward both sides of the light guide plate 120. That is, the light beam L1 leaves the cymbal 130 at a large light exit angle θ 1 , wherein the light exit angle θ 1 is the angle between the light beam L1 and the normal line N1. In this way, the illumination module 100 can generate a plurality of light beams emitted from a large angle, thereby providing a planar light source having higher light intensity on both sides than the center, wherein the light source of the planar light source is as shown. image 3. On the other hand, by changing the angle α of the 稜鏡 structure 134, the light exit angle θ 1 of the light beam L1 can also be adjusted, and the light output pattern of the planar light source can also be adjusted. For example, the light exit angle θ 1 of the light beam L1 increases as the angle α increases, so that the light beam L1 is more divergent, which can be achieved by increasing the angle of the angle α.

FIG. 3 is a schematic diagram of the light pattern of the illumination module 100 of FIG. 1 , wherein the scale in the radial direction corresponds to the light intensity of the plane light source at different light exit angles θ 1 . Referring to FIG. 1 to FIG. 3, when a reverse diaphragm (for example, the cymbal 130) is disposed on the light guide plate 120, most of the light beam L1 is deflected away from the normal. The direction of N1, the illumination module 100 of the present embodiment can provide a planar light source with higher light intensity than the central light intensity.

Continuing to refer to FIG. 1 , the lighting module 100 of the embodiment further includes a diffusion sheet 140 , and the diffusion sheet 140 is disposed on the cymbal sheet 130 . In order to avoid the film interference phenomenon between the contact surfaces of the cymbal sheet 130 and the diffusion sheet 140, a spacer 150 is disposed between the cymbal sheet 130 and the diffusion sheet 140 in this embodiment. 4 is a top plan view of the spacer 150 of FIG. 1. As shown in FIG. 4, the central portion of the spacer 150 is an opening design having an opening OP having an opening OP area that is much larger than 50% of the light-emitting surface S1, so that the illuminable area of the lighting module 100 is not substantially affected. In a preferred embodiment, the area of the light exit surface S1 of the opening OP area is greater than or equal to 80%. In this embodiment, the spacer 150 is, for example, a reflective sheet, and the reflective sheet is disposed between the cymbal sheet 130 and the diffusion sheet 140. In addition to avoiding the interference phenomenon of the film, the light leakage of the illumination module 100 can be reduced. The light use efficiency of the lighting module 100 is improved.

As shown in FIG. 1 , in one embodiment, the diffusion sheet 140 includes a substrate 142 and a plurality of diffusion particles 142 a , and the diffusion particles 142 a are distributed in the substrate 142 . In the present embodiment, the diffusion particles 142a are, for example, diffusion materials such as titanium oxide or cerium oxide. The diffusion particles 142a contribute to the improvement of light uniformity. In addition, the illumination module 100 of the embodiment further includes a reflective sheet 160 disposed on a side close to the surface S2 of the light guide plate 120 to reflect the light beam L1 back to the light guide plate 120, thereby increasing light use efficiency. In addition, the lighting module 100 further includes an upper cover 170, and the upper cover 170 is disposed on the diffusion sheet 140.

5A to FIG. 5C are schematic diagrams of the light-emitting patterns SP1 to SP3 of the planar light source of the illumination module 100, wherein the light-emitting patterns SP1 to SP3 respectively correspond to the diffusion particles 142a of different concentrations of FIG. 1 . In detail, the concentration of the diffusing particles 142a corresponding to the light-emitting shape SP1 is the lowest, so the scattering effect is low, so that the uniformity of the planar light source is lower than that of the light-emitting shapes SP2 and SP3, that is, more light beams are emitted from the illumination module 100. The left and right obliquely above the light, and the light beam corresponding to the area B1 directly above the illumination module 100 will have less light beams emitted from the left and right sides. As shown in FIG. 5B, when the concentration of the diffusion particles 142a is increased, since the probability of the light beam being scattered is also increased, more light beams will be emitted from directly above the illumination module 100, that is, the region B2 of the light shape SP2. The light intensity is higher than the light intensity of the region B1 of the light shape SP1. When the concentration of the diffusion particles 142a continues to increase to a certain extent, the convergence of the light beam from the cymbal 130 will be greater, thereby forming the light shape SP3 as shown in FIG. 5C, that is, most of the light beams are from the illumination module 100. Directly above the light. Therefore, in the present embodiment, different light-emitting patterns can be achieved by adjusting the concentration of the diffusion particles 142a.

Therefore, since the light guide plate 120 can make the light beam forward and generate a uniform planar light source, the light beam can be diverged or converged by selecting different cymbals 130 or diffusion sheets 140 to enable the illumination module. 100 achieve different light output effects. That is, the high compatibility of the light guide plate 120 with the optical film described above makes the lighting module 100 very convenient in design, and the designer can select the desired one by selecting a commercially available cymbal or diffusion sheet. Light shape. In addition, since the light guide plate 120 is simple to manufacture, and the cost of the cymbal sheet 130 and the diffusion sheet 140 is low, the embodiment is The lighting module 100 has the advantage of lower cost than the lighting device of the conventional complicated structure.

Second embodiment

FIG. 6 is a cross-sectional view of a lighting module 200 according to a second embodiment of the present invention. The illumination module 200 of FIG. 6 is similar to the illumination module 100 of FIG. 1 , but the main difference is that the diffusion sheet 240 includes a substrate 242 and a plurality of microstructures 244 , and the microstructures 244 are disposed on the substrate 242 away from the substrate 242 . The surface S5 of the cymbal 130. In the present embodiment, the microstructure 244 is, for example, a plurality of microlenses 244', wherein the microlenses 244' can achieve the effect of converging the light beam.

Similarly, in the present embodiment, different light-emitting patterns can be produced by adjusting the haze or concentrating ability of the microlens 244'. In detail, when the haze or concentrating ability of the microlens 244' is low, more light beams are emitted from the obliquely upper side of the illumination module 200 (as shown in FIG. 5A); when the microlens 244' is fogged The higher the degree of concentrating or concentrating, the more obvious the extent to which the beam is converged, such that more beams exit the light directly above the illumination module 200 (as shown in Figure 5C).

Third embodiment

FIG. 7 is a cross-sectional view of a lighting module 300 according to a third embodiment of the present invention. The illumination module 300 of FIG. 7 is similar to the illumination module 200 of FIG. 6, but the main difference is that the substrate 132' further includes a plurality of microstructures 136, and the microstructures 136 are disposed on opposite surfaces of the wafer 130'. A surface S6 of S4. In other words, the microstructure 136 and the crucible structure 134 are arranged in The same substrate 132' is located on opposite surfaces S4 and S6 of the substrate 132', respectively, wherein the microstructure 136 is, for example, a microlens. Therefore, in the embodiment, the illumination module 300 may not use the diffusion sheet 240 of FIG. 6 and the spacer 150. In addition, a plurality of diffusion particles 132a may be distributed inside the substrate 132' of the embodiment to increase the uniformity of the planar light source.

In addition, the illumination module 300 of the embodiment further includes a light-emitting element 310 disposed on a surface S7 opposite to the light-incident surface S3. The light-emitting element 310 is adapted to emit the light beam L2, and when the light beam L2 is incident on the microstructure 122' of the light guide plate 120', the microstructure 122' destroys the total reflection of the light beam L2, thereby causing the light beam L2 to pass through the light-emitting surface S1 in a forward manner. It is transmitted to the outside of the light guide plate 120', that is, the traveling direction P2 of the light beam L2 which is emitted outside the light guide plate 120' is substantially perpendicular to the light exit surface S1. In addition, in the present embodiment, the number density of the microstructures 122' near the light-emitting elements 110 and 310 is smaller than the number density at the distance from the light-emitting elements 110 and 310 to enhance the uniformity of light emitted by the light beams from the light guide plate 120'.

In summary, embodiments of the invention include at least one of the following advantages or benefits. Since the light guide plate of the illumination module can emit light in a direction substantially perpendicular to the light exit surface of the light guide plate and generate a uniform planar light source, and a baffle plate having a 稜鏡 structure facing the light guide plate disposed above the light guide plate, the light beam is After being passed through the structure, it can be effectively scattered, thereby producing an exit light pattern having higher light intensity on both sides than the middle portion. In addition, since the structure of the light guide plate of the embodiment is simple, and the light guide plate has good compatibility with the optical mold, the designer can achieve the desired light output by selecting different cymbals or diffusion sheets. shape. In addition, since the light guide plate is simple to manufacture, In addition, since the cymbal and the diffusion sheet are inexpensive, the lighting module of the embodiment can save cost in production. In addition, in this embodiment, since the spacer is disposed between the cymbal sheet and the diffusion sheet, the phenomenon of film interference between the cymbal sheet and the diffusion sheet can be effectively avoided.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

The terms "first", "second", "." used in the specification and the scope of the patent application are only used to name the elements, and are not intended to limit the upper or lower limit of the number of elements.

100, 200, 300‧‧‧ lighting modules

110, 310‧‧‧Lighting elements

120, 120'‧‧‧Light guide plate

130, 130’‧‧‧ pictures

140, 240‧‧‧ diffuser

150‧‧‧ spacers

160‧‧‧reflector

170‧‧‧Upper cover

122, 122’, 136, 244‧‧‧ microstructures

244'‧‧‧Microlens

132, 132', 142, 242‧‧‧ substrates

122a, 122a', 132a, 142a‧‧‧ diffusing particles

134‧‧‧稜鏡 structure

L1~L2‧‧‧ Beam

P1~P2‧‧‧direction of travel

S1‧‧‧ shine surface

S2, S4, S5~S7‧‧‧ surface

S3‧‧‧Into the glossy surface

A, B1~B2‧‧‧ area

N1‧‧‧ normal

θ 1‧‧‧Lighting angle

‧‧‧‧ angle

OP‧‧‧ openings

SP1~SP3‧‧‧Lighting shape

1 is a cross-sectional view of a lighting module in accordance with a first embodiment of the present invention.

2 is an enlarged schematic view showing the traveling of the light beam of FIG. 1 on the 稜鏡 structure of the area A of FIG. 1.

FIG. 3 is a schematic view showing the light pattern of the illumination module of FIG. 1. FIG.

4 is a top plan view of the spacer of FIG. 1.

5A to 5C are schematic diagrams showing the light pattern of the planar light source of the illumination module.

Figure 6 is a cross-sectional view showing a lighting module of a second embodiment of the present invention.

Figure 7 is a cross-sectional view showing a lighting module of a third embodiment of the present invention.

100‧‧‧Lighting module

110‧‧‧Lighting elements

120‧‧‧Light guide

130‧‧‧ Picture

140‧‧‧Diffuser

150‧‧‧ spacers

160‧‧‧reflector

170‧‧‧Upper cover

122‧‧‧Microstructure

132, 142‧‧‧ substrate

122a, 142a‧‧‧Diffusion particles

134‧‧‧稜鏡 structure

L1‧‧‧ Beam

P1‧‧‧direction of travel

S1‧‧‧ shine surface

S2, S4‧‧‧ surface

S3‧‧‧Into the glossy surface

A‧‧‧ area

Claims (14)

A lighting module comprising: at least one light-emitting element adapted to emit a light beam; a light guide plate having a light-emitting surface, a first surface opposite to the light-emitting surface, and an entrance connecting the light-emitting surface and the first surface a light surface, the light emitting element is disposed beside the light incident surface, the light beam is adapted to enter the light guide plate through the light incident surface, and the traveling direction of the light beam emitted to the outside of the light guide plate is substantially perpendicular to the light exit surface; Disposed on the light guide plate, wherein the cymbal includes a first substrate and a plurality of 稜鏡 structures, and the 稜鏡 structures are uniformly disposed on the first substrate adjacent to a second surface of the illuminating surface; a diffusion sheet disposed on the cymbal sheet; and a spacer disposed between the cymbal sheet and the diffusion sheet, wherein the central portion of the spacer has an opening, and the spacer has a shape of a mouth shape. The lighting module of claim 1, wherein the plurality of the structures are substantially identical. The illumination module of claim 1, wherein the diffusion sheet comprises a second substrate and a plurality of diffusion particles, and the diffusion particles are distributed in the second substrate. The illuminating module of claim 1, wherein the diffusing film comprises a second substrate and a plurality of microstructures, and the microstructures are disposed on the second substrate away from a third surface of the cymbal. The lighting module of claim 4, wherein the microstructures are a plurality of microlenses. The lighting module of claim 1, wherein the first substrate further comprises a plurality of microstructures, and the microstructures are disposed on a third surface of the second surface opposite to the second surface. The lighting module of claim 6, further comprising a plurality of diffusion particles, wherein the diffusion particles are distributed in the first substrate. The lighting module of claim 1, wherein the light emitting surface of the light guiding plate is substantially parallel to the first surface. The lighting module of claim 1, further comprising a plurality of microstructures disposed on the first surface of the light guide plate. The lighting module of claim 9, wherein the microstructures have a quantity density near the light-emitting element that is less than a quantity density away from the light-emitting element. The lighting module of claim 9, wherein the microstructures are bumps. The lighting module of claim 11, further comprising a plurality of diffusion particles distributed in the microstructures. The lighting module of claim 1, further comprising a reflective sheet disposed on a side of the light guide plate adjacent to the first surface. The lighting module of claim 1, wherein an area of the opening of the spacer is greater than or equal to 80% of the light exit area.