Light emitting module

Abstract

A light-emitting module includes a light guide member, a first reflective coating layer, a first light-absorbing coating layer, a circuit board and a light-emitting unit. The light guide member includes a positioning surface, a first side surface, a second side surface and a light emitting surface. The positioning surface comprises a groove. The positioning surface is connected with the second side surface and the light emitting surface, the second side surface is connected with the first side surface, and the first side surface is connected with the light emitting surface. The first reflective coating layer is disposed on the first side surface, and the first light-absorbing coating layer is disposed on the first reflective coating layer. The circuit board is located on the positioning surface. The light-emitting unit is arranged on the circuit board and contained in the groove. Therefore, the light-emitting unit of the circuit board changes the light path and projects the light to the light-emitting surface, and the requirement for the stacking thickness of the light-emitting module is reduced.

Description

Technical Field

[0001] A light-emitting module, in particular, refers to a light-emitting module comprising a reflective coating layer and a light-absorbing coating layer. Background Art

[0002] Light-emitting modules are widely used in various products, giving these products special luminous visual effects. Existing light-emitting modules include light guides, optical fibers, support bases, and brackets. The optical fiber needs to be fixed behind the light guide through the support base, and brackets are also required at both ends of the optical fiber to fix the combination of the optical fiber and the light source. In this way, the light-emitting module needs a structural thickness of at least 3.0 mm. Summary of the invention

[0003] In order to make the light effect uniform and effectively eliminate hot spots, the vertical distance from the LED light-emitting surface to the light-emitting surface of the light guide must be at least 6.0 mm, or a high concentration of diffusing agent or diffusing powder must be added to assist in light diffusion and reduce hot spots.

[0004] In view of the above, in some embodiments, a light-emitting module includes a light guide, a first reflective coating layer, a first light-absorbing coating layer, a circuit board, and a light-emitting unit. The light guide includes a positioning surface, a first side surface, a second side surface, and a light-emitting surface. The positioning surface includes a groove. The positioning surface is connected to the second side surface and the light-emitting surface, the second side surface is connected to the first side surface, and the first side surface is connected to the light-emitting surface. The first reflective coating layer is disposed on the first side surface, and the first light-absorbing coating layer is disposed on the first reflective coating layer. The circuit board is located on the positioning surface. The light-emitting unit is placed on the circuit board and accommodated in the groove.

[0005] In some embodiments, the light-emitting module further comprises a second reflective paint layer and a second light-absorbing paint layer. The second reflective paint layer is disposed on the second side surface. The second light-absorbing paint layer is disposed on the second reflective paint layer.

[0006] In some embodiments, the light emitting module further includes a third reflective coating layer disposed on the inner surface of the circuit board.

[0007] In some embodiments, the light-emitting module further comprises a fourth reflective paint layer and a third light-absorbing paint layer. The fourth reflective paint layer is disposed on the positioning surface. The third light-absorbing paint layer is disposed on the fourth reflective paint layer.

[0008] In some embodiments, the two ends of the first side surface respectively include a first end and a second end, the first end is connected to the light emitting surface, and the second end is connected to the second side surface. The distance between the first end and the positioning surface is smaller than the distance between the second end and the positioning surface.

[0009] In some embodiments, the angle between the first side surface and the second side surface is 88 to 90 degrees.

[0010] In some embodiments, an axial direction perpendicular to the second side surface is a first axial direction, and a width of the groove in the first axial direction is greater than a width of the light emitting unit in the first axial direction.

[0011] In some embodiments, the groove includes an inner side surface, an outer side surface, and a light incident surface. The inner side surface is close to the second side surface, the outer side surface is close to the light emitting surface, and the light incident surface connects the inner side surface and the outer side surface. The axis perpendicular to the second side surface is the first axis. The distance between the light emitting unit and the outer side surface in the first axis is 1.5 to 2 times the width of the light emitting unit in the first axis.

[0012] In some embodiments, the axis perpendicular to the positioning surface is a second axis, and the height of the groove in the second axis is greater than the height of the light emitting unit in the second axis.

[0013] In some embodiments, the axis perpendicular to the second side surface is the first axis, the distance between the light-emitting unit and the second side surface in the first axis is smaller than the distance between the light-emitting unit and the light-emitting surface in the first axis, and the distance between the groove and the second side surface in the first axis is smaller than the distance between the groove and the light-emitting surface in the first axis.

[0014] In some embodiments, the light emitting module includes a plurality of light emitting units, and each light emitting unit is equidistantly disposed on the circuit board.

[0015] In some embodiments, the positioning surface includes a plurality of grooves and ribs, the ribs are located between the grooves, the surface of the ribs is coplanar with the positioning surface, and the circuit board is located on the surface of the ribs.

[0016] In some embodiments, the positioning surface further comprises ribs at two ends close to the light emitting surface and the second side surface respectively.

[0017] In some embodiments, the thickness of the first reflective coating layer is greater than the thickness of the first light absorbing coating layer.

[0018] In some embodiments, the area of ​​the first reflective coating layer is less than or equal to the area of ​​the first light absorbing coating layer.

[0019] In some embodiments, the first side includes a first area and a second area, the first area connects the light emitting surface and the second area, and the second area connects the second side. The first reflective coating layer is disposed in the second area, and the first light absorbing coating layer is disposed in the first area and the second area.

[0020] In some embodiments, the light emitting surface includes a vertical light emitting surface and an oblique light emitting surface, the oblique light emitting surface is connected to the vertical light emitting surface and the first side surface, the angle between the oblique light emitting surface and the vertical light emitting surface is an obtuse angle, and the angle between the oblique light emitting surface and the first side surface is an obtuse angle.

[0021] In some embodiments, the axis perpendicular to the positioning surface is the second axis, and the projection length of the oblique light-emitting surface on the second axis is smaller than the projection length of the perpendicular light-emitting surface on the second axis.

[0022] In some embodiments, the light guide further includes a microstructure disposed on the light emitting surface.

[0023] In some embodiments, the light guide member is an annular light guide structure, and the side of the light guide member has a curved section.

[0024] In some embodiments, the light emitting direction of the light emitting unit is perpendicular to the circuit board. The light emitted by the light emitting unit enters the light guide from the light incident surface of the groove, is reflected by at least one of the first side surface and the second side surface, and leaves the light guide from the light emitting surface.

[0025] In some embodiments, the axis perpendicular to the second side surface is the first axis, the axis perpendicular to the positioning surface is the second axis, the first axis is perpendicular to the second axis, the thickness of the light-emitting module in the second axis is less than or equal to 1.5 mm, and the distance from the light-emitting unit to the light-emitting surface in the first axis is less than or equal to 6 mm.

[0026] Thus, according to some embodiments, by combining the light guide, the reflective coating layer and the light absorbing coating layer, the light emitted by the light emitting unit can be deflected and reflected, and the distance of the light path projected to the light emitting surface can be increased, so as to reduce the stacking thickness requirement of the light emitting module, shorten the height requirement of the light guide, reduce the distance required for light averaging from the light emitting unit to the light emitting surface, and improve the brightness and uniformity of the light emitting module. According to some embodiments, the light emitting module has weight and space advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is to draw a schematic diagram of the appearance of an electronic product according to some embodiments;

[0028] Figure 2A is a perspective exploded schematic diagram of a first embodiment of a light emitting module;

[0029] Figure 2B Is drawing Figure 2A The cross-sectional diagram of the lead marked 2B-2B in the figure shows the state of the circuit board, the first reflective coating layer and the first light-absorbing coating layer combined on the light guide;

[0030] Figure 3 is a cross-sectional schematic diagram of a second embodiment of a light emitting module;

[0031] Figure 4 is a cross-sectional schematic diagram of a third embodiment of a light emitting module;

[0032] Figure 5 is a partial three-dimensional exploded diagram of the first embodiment of the light emitting module Figure 1 ;

[0033] Fig. 6A is a partial exploded perspective diagram 2 of the first embodiment of the light emitting module;

[0034] Figure 6B is a partial exploded perspective view of a fourth embodiment of a light emitting module;

[0035] Fig. 7A Is drawing Fig. 6A Schematic diagram of the appearance in the direction of arrow K;

[0036] Figure 7B Is drawing Figure 6B Schematic diagram of the appearance in the direction of arrow K;

[0037] Fig. 8A Is drawing Fig. 6A Schematic diagram of the appearance in the direction of the M arrow;

[0038] Figure 8B Is drawing Figure 6B Schematic diagram of the appearance in the direction of the M arrow;

[0039] Fig.9A is a schematic diagram of light effect simulation of a fifth embodiment of a light emitting module;

[0040] Fig. 9B is a schematic diagram of light effect simulation of a sixth embodiment of a light emitting module;

[0041] Fig. 9C is a schematic diagram of light effect simulation of the seventh embodiment of the light emitting module;

[0042] Fig. 10A is a schematic diagram of light effect simulation of an eighth embodiment of a light emitting module;

[0043] Fig. 10B is a schematic diagram of light effect simulation of a ninth embodiment of a light emitting module;

[0044] Fig. 10C is a schematic diagram of light effect simulation of a tenth embodiment of a light emitting module;

[0045] Fig. 10D FIG. 1 is a schematic diagram of light effect simulation of the eleventh embodiment of the light emitting module.

[0046]

Explanation of symbols

[0047] 100: Light emitting module

[0048] 200: Electronic products

[0049] 1: Light guide

[0050] 10: Groove

[0051] 101: Inner side

[0052] 102: Outer side

[0053] 103: Light-entering surface

[0054] 104: Rib

[0055] 11: Positioning surface

[0056] 111: ribs

[0057] 112: ribs

[0058] 113: External positioning surface

[0059] 114: Inner positioning surface

[0060] 12: First side

[0061] 121: first end

[0062] 122: Second end

[0063] 123: District 1

[0064] 124: District 2

[0065] 13: Second side

[0066] 14: Bright surface

[0067] 141: Vertical light emitting surface

[0068] 142: Oblique glossy surface

[0069] 143: Microstructure

[0070] 15: Bending section

[0071] 2: Circuit Board

[0072] 21: Bending the circuit board segment

[0073] 3: Light-emitting unit

[0074] 4: First reflective coating layer

[0075] 4': Second reflective coating layer

[0076] 4”: Third reflective coating layer

[0077] 4”': The fourth reflective coating layer

[0078] 5: The first light-absorbing coating layer

[0079] 5': Second light absorbing coating layer

[0080] 5”: The third light-absorbing coating layer

[0081] A: Axial

[0082] B: Axial

[0083] D1: Width

[0084] D2: Distance

[0085] D3: Distance

[0086] D4: Distance

[0087] D5: Distance

[0088] L: plumb line

[0089] θ1: Angle

[0090] θ2: Angle

[0091] θ3: Angle

[0092] 2B-2B: Lead

[0093] K: Arrow direction

[0094] M: Arrow direction DETAILED DESCRIPTION

[0095] According to some embodiments, the light emitting module 100 can be applied to various electronic products, home appliances, car lights, tires or fans, etc., to present a good special light emitting visual effect. According to some embodiments, the light emitting module 100 can be applied to e-sports electronic products 200 (such as Figure 1 shown).

[0096] See also Figure 2A and Figure 2B , Figure 2A is a perspective exploded schematic diagram of a first embodiment of the light emitting module 100, Figure 2B For drawing Figure 2A The cross-sectional schematic diagram of the lead marked 2B-2B. The light-emitting module 100 includes a light guide 1, a first reflective coating layer 4, a first light-absorbing coating layer 5, a circuit board 2 and a light-emitting unit 3. The light guide 1 includes a positioning surface 11, a first side surface 12, a second side surface 13 and a light-emitting surface 14. Among them, the positioning surface 11 includes a groove 10, the positioning surface 11 is connected to the second side surface 13 and the light-emitting surface 14, the second side surface 13 is connected to the first side surface 12, and the first side surface 12 is connected to the light-emitting surface 14. The first reflective coating layer 4 is arranged on the first side surface 12, and the first light-absorbing coating layer 5 is arranged on the first reflective coating layer 4. The circuit board 2 is located on the positioning surface 11. The light-emitting unit 3 is placed on the circuit board 2 and accommodated in the groove 10.

[0097] When the circuit board 2 is positioned with the aid of the positioning surface 11 and combined with the light guide 1, the light emitted by the light unit 3 is at least deflected and reflected by the first reflective coating layer 4 and projected to the light output surface 14, thereby achieving a uniform light effect by changing the path of the light. In addition, the circuit board 2 is attached to the light guide 1, which can reduce the stacking thickness requirement of the light module 100 and shorten the height requirement of the light guide 1, and can further improve the brightness and uniformity of the light module 100. In addition, the light module 100 has fewer components and is easy to assemble, and has weight and space advantages in the installed product.

[0098] See also Figure 2A In some embodiments, the light guide 1 is an annular light guide structure having an annular curvature shape. In some embodiments, the light guide 1 may be polystyrene (PS), polycarbonate (PC), polymethyl methacrylate (PMMA) or other polymer materials. In some embodiments, the light guide 1 may be a polyester film (PET film). In some embodiments, the light guide 1 may be glass. In some embodiments, auxiliary materials such as diffusing agents, diffusion powders, and color powders may be added to the light guide 1. In some embodiments, the circuit board 2 may be a flexible printed circuit (FPC). In some embodiments, the light-emitting unit 3 may be a light-emitting diode (LED).

[0099] See also Figure 2A In some embodiments, the first side surface 12 may further include a positioning groove or a positioning protrusion to securely engage with the product, but the present invention is not limited thereto.

[0100] See also Figure 2B In some embodiments, the circuit board 2 is glued on the surface and attached to the positioning surface 11. In some embodiments, the groove 10 is a narrow and long groove to accommodate the light-emitting unit 3 (see Figure 2A ).

[0101] See also Figure 2B In some embodiments, the light emitting surface 14 includes a vertical light emitting surface 141 and an oblique light emitting surface 142, the oblique light emitting surface 142 is connected to the vertical light emitting surface 141 and the first side surface 12, the angle between the oblique light emitting surface 142 and the vertical light emitting surface 141 is an obtuse angle, and the angle between the oblique light emitting surface 142 and the first side surface 12 is an obtuse angle.

[0102] See also Figure 2B In some embodiments, the positioning surface 11 further includes ribs 111 and 112 at both ends close to the light emitting surface 14 and the second side surface 13. In other words, the circuit board 2 is located between the ribs 111 and 112 and fits the positioning surface 11. The ribs 111 and 112 on both sides make it easy for the circuit board 2 to be aligned and fit the positioning surface 11.

[0103] See also Figure 2B In some embodiments, the positioning surfaces 11 on both sides of the groove 10 include an outer positioning surface 113 close to the light emitting surface 14 and an inner positioning surface 114 close to the second side surface 13. The groove 10 includes an inner side surface 101 close to the second side surface 13, an outer side surface 102 close to the light emitting surface 14, and a light incident surface 103 connecting the inner side surface 101 and the outer side surface 102. The inner side surface 101 and the outer side surface 102 have the same height. In some embodiments, the circuit board 2 is located between the ribs 111 and 112 and fits the outer positioning surface 113 and the inner positioning surface 114.

[0104] See also Figure 2B , with respect to the first side surface 12, the structure of the light emitting module 100 from the outside to the inside is the first light absorbing paint layer 5, the first reflective paint layer 4 and the first side surface 12 in sequence. In some embodiments, the light emitting module 100 further includes a second reflective paint layer 4' disposed on the second side surface 13, and a second light absorbing paint layer 5' disposed on the second reflective paint layer 4', the second reflective paint layer 4' is connected to the first reflective paint layer 4, and the second light absorbing paint layer 5' is connected to the first light absorbing paint layer 5. In other words, with respect to the second side surface 13, the structure from the outside to the inside is the second light absorbing paint layer 5', the second reflective paint layer 4' and the second side surface 13 in sequence. In some embodiments, the light emitting module 100 further includes a third reflective paint layer 4' disposed on the inner surface of the circuit board 2. In some embodiments, the light emitting module 100 further includes a fourth reflective paint layer 4'' disposed on the positioning surface 11, and a third light absorbing paint layer 5'' disposed on the fourth reflective paint layer 4'', the fourth reflective paint layer 4'' is connected to the second reflective paint layer 4', and the third light absorbing paint layer 5' is connected to the second light absorbing paint layer 5'. In other words, with respect to the positioning surface 11 , the structures from the outside to the inside are the third light absorbing coating layer 5 ″, the fourth reflective coating layer 4 ″′ and the positioning surface 11 in sequence.

[0105] In some embodiments, the fourth reflective paint layer 4 ′″ disposed on the positioning surface 11 and the third light absorbing paint layer 5 ″ disposed on the fourth reflective paint layer 4 ′″ are disposed on the inner positioning surface 114 and the convex ribs 112 of the positioning surface 11 .

[0106] Through the aforementioned reflective coating layers 4, 4', 4", 4'", the light emitted by the light emitting unit 3 can be deflected and reflected and projected to the light emitting surface 14, so that the path distance of the light projected to the light emitting surface 14 is increased, rather than being directly projected to the light emitting surface 14, thereby shortening the actual distance from the light emitting unit 3 to the light emitting surface 14 and achieving a uniform visual effect. In some embodiments, the distance from the light emitting unit 3 to the light emitting surface 14 is less than 6 millimeters (mm). In other words, the axial direction perpendicular to the second side surface 13 is the axial direction A, and the distance from the light emitting unit 3 to the light emitting surface 14 on the axial direction A is less than or equal to 6 millimeters.

[0107] By means of the aforementioned light-absorbing paint layers 5, 5', 5", the light-emitting module 100 can have a consistent appearance color with the product appearance, have concealment and avoid light leakage. To meet the appearance requirements, the light-absorbing paint layers 5, 5', 5" can be paint layers of various colors. For example, when the product appearance is red, the aforementioned light-absorbing paint layers 5, 5' and 5" can be red paint layers, and when the product appearance is black, they can be black paint layers, but not limited to this. By matching the reflective paint layers 4, 4', 4", 4"' with the light-absorbing paint layers 5, 5', 5", the appearance of the light-emitting module 100 can present the original color effect of the light-absorbing paint layer when the light-emitting unit 3 is not lit, and the light-emitting module 100 can present a uniform light effect when the light-emitting unit 3 is lit.

[0108] Furthermore, by combining the aforementioned light guide 1 with the reflective coating layers 4, 4', 4", 4'" and the light absorbing coating layers 5, 5', 5", the stacking thickness requirement of the light emitting module 100 is reduced and the height requirement of the light guide 1 is shortened, thereby improving the brightness and uniformity of the light emitting module 100 and increasing the utilization rate of light. In some embodiments, the structural thickness of the light emitting module 100 is less than 1.5 mm. In other words, the axial direction perpendicular to the positioning surface 11 is the axial direction B, and the thickness of the light emitting module 100 in the axial direction B is less than or equal to 1.5 mm.

[0109] See also Figure 2B In some embodiments, the thickness of the first reflective coating layer 4 is greater than the thickness of the first light absorbing coating layer 5, the thickness of the second reflective coating layer 4' is greater than the thickness of the second light absorbing coating layer 5', and the thickness of the fourth reflective coating layer 4'' is greater than the third light absorbing coating layer 5". In some embodiments, the higher the thickness of the reflective coating layers 4, 4', 4'' and 4'', the better the reflection effect. In some embodiments, the thickness of the reflective coating layers 4, 4', 4'' and 4'' is greater than 0.02 mm, and the thickness of the light absorbing coating layers 5, 5' and 5'' is greater than 0.02 mm.

[0110] See also Figure 2B In some embodiments, the area of ​​the first reflective coating layer 4 is less than or equal to the area of ​​the first light absorbing coating layer 5 .

[0111] See also Figure 2BIn some embodiments, the first side surface 12 includes a first area 123 and a second area 124. The boundary between the first area 123 and the second area 124 is a vertical line L on the first side surface 12. The vertical line L extends vertically from the outer side surface 102 toward the first side surface 12. The first area 123 connects the light emitting surface 14 and the second area 124, and the second area 124 connects the second side surface 13. The first reflective coating layer 4 is disposed in the second area 124, and the first light absorbing coating layer 5 is disposed in the first area 123 and the second area 124. The length of the first area 123 is smaller than the length of the second area 124. By making the area of ​​the first reflective coating layer 4 smaller than the area of ​​the first light absorbing coating layer 5, light leakage can be avoided.

[0112] See also Figure 3 , Figure 3 1 is a cross-sectional schematic diagram of a second embodiment of the light emitting module 100. In other embodiments, the area of ​​the first reflective coating layer 4 is equal to the area of ​​the first light absorbing coating layer 5. The first reflective coating layer 4 is disposed in the first area 123 and the second area 124, and the first light absorbing coating layer 5 is disposed in the first area 123 and the second area 124. In some embodiments, the first reflective coating layer 4 and the first light absorbing coating layer 5 are uniformly disposed on the entire surface of the first side surface 12 and do not exceed the first end 121. By making the area of ​​the first reflective coating layer 4 equal to the area of ​​the first light absorbing coating layer 5, light leakage can be avoided and a good appearance can be presented.

[0113] See also Figure 2B In some embodiments, the two ends of the first side surface 12 include a first end 121 and a second end 122, respectively, the first end 121 is connected to the light emitting surface 14, and the second end 122 is connected to the second side surface 13, and the distance between the first end 121 and the positioning surface 11 is smaller than the distance between the second end 122 and the positioning surface 11. In other words, the angle between the first side surface 12 and the second side surface 13, that is, the second end 122, is an acute angle.

[0114] See also Figure 2B In some embodiments, the angle between the first side surface 12 and the second side surface 13, that is, the second end portion 122, can be a sharp angle or a rounded angle (not shown). When the angle is rounded, the first reflective coating layer 4 and the second reflective coating layer 4', and the first light absorbing coating layer 5 and the second light absorbing coating layer 5' are curved structures.

[0115] See also Figure 2BIn some embodiments, the axial direction perpendicular to the second side surface 13 is axial direction A, the axial direction perpendicular to the positioning surface 11 is axial direction B, and axial direction A is perpendicular to axial direction B. The width of the groove 10 in axial direction A is greater than the width of the light-emitting unit 3 in axial direction A, and the height of the groove 10 in axial direction B is greater than the height of the light-emitting unit 3 in axial direction B. Through the groove 10 of the light guide 1, the light path can be changed to achieve a uniform light effect. Since the width and height of the above-mentioned groove 10 are both greater than the width and height of the light-emitting unit 3, an air layer is further provided between the groove 10 and the light-emitting unit 3, and the light emitted by the light-emitting unit 3 is able to pass through the space of the air layer through the action of the third reflective coating layer 4" to produce a good light mixing effect.

[0116] See also Figure 2B In some embodiments, the distance between the light emitting unit 3 and the second side surface 13 in the axial direction A is smaller than the distance between the light emitting unit 3 and the light emitting surface 14 in the axial direction A, and the distance between the groove 10 and the second side surface 13 in the axial direction A is smaller than the distance between the groove 10 and the light emitting surface 14 in the axial direction A. In some embodiments, the distance between the light emitting unit 3 and the inner side surface 101 in the axial direction A is smaller than the distance between the light emitting unit 3 and the outer side surface 102 in the axial direction A.

[0117] See also Figure 2B In some embodiments, in the axial direction A, the ratio of the distance between the light emitting unit 3 and the second side surface 13 to the distance between the light emitting unit 3 and the light emitting surface 14 is 1:2.

[0118] See also Figure 2B In some embodiments, the inner side surface 101 and the outer side surface 102 have the same height along the axial direction B. The light incident surface 103 and the positioning surface 11 are parallel to each other.

[0119] See also Figure 2B In some embodiments, the projection length of the oblique light-emitting surface 142 on the axial direction B is smaller than the projection length of the perpendicular light-emitting surface 141 on the axial direction B.

[0120] See also Figure 4 , Figure 4 1 is a cross-sectional view of a third embodiment of the light emitting module 100. In some embodiments, the light guide 1 further includes a microstructure 143 disposed on the light emitting surface 14 (for example, disposed perpendicular to the light emitting surface 141). The aforementioned microstructure 143 can improve the light uniformity of the light emitting module 100.

[0121] In some embodiments, the groove 10 can be a single groove or a plurality of grooves. Figure 5 , Figure 5 FIG. 1 is a partial exploded view of the first embodiment of the light emitting module 100 Figure 1In some embodiments, the positioning surface 11 includes a plurality of grooves 10 and ribs 104, the ribs 104 are located between the grooves 10, the surface of the ribs 104 is coplanar with the positioning surface 11, and the circuit board 2 is located on the surface of the ribs 104 and the positioning surface 11. Through the supporting effect of the aforementioned ribs 104, the circuit board 2 and the light guide 1 can be firmly attached to each other.

[0122] See also Figure 5 In some embodiments, the rib 104 may further include positioning holes or positioning protrusions, but is not limited thereto.

[0123] See also Figure 5 In some embodiments, the light emitting module 100 includes a plurality of light emitting units 3, and each light emitting unit 3 is equidistantly placed on the circuit board 2. In some embodiments, the distance between each light emitting unit 3 is 7.5 mm to 8.0 mm. In other embodiments, in order to match the light effect to be presented by the light emitting module 100, each light emitting unit 3 is unequally placed on the circuit board 2 (not shown). By adjusting the number and distribution position of the light emitting units 3, a uniform light effect can be presented. In some embodiments, the light emitting module 100 can present a flowing and uniform light effect.

[0124] See also FIG. 6A to FIG. 7B In some embodiments, the circuit board 2 is a flexible circuit board. By directly attaching the flexible circuit board to the positioning surface 11 of the light guide 1, the overall thickness of the light emitting module 100 can be reduced to less than 1.5 mm, thereby increasing the space available for product design.

[0125] Please also see FIG. 6A to FIG. 7B and Figure 2A In some embodiments, the light guide 1 is an annular light guide structure, and the side of the light guide 1 has a curved section 15, and the curved section 15 is used to connect the upper part and the lower part of the light guide 1. Fig. 7A and Figure 7B is from Fig. 6A and Figure 6B The view from the direction of the arrow K is shown in the figure. Fig. 8A and Figure 8B is from Fig. 6A and Figure 6B View from the direction of the arrow M. Fig. 6A , Fig. 7A and Fig. 8A In some embodiments, the upper portion and the lower portion of the light guide 1 are at the same projection position on the axial direction A. When viewed from the direction of the arrow M, the light guide 1 is a rectangle (or rectangular) with four right angles. Here, in order to match the curved section 15 of the light guide 1, the circuit board 2 is a straight strip circuit board. Figure 6B , Figure 7B and Figure 8BIn some embodiments, the upper portion and the lower portion of the light guide 1 have different projection positions on the axial direction A. When the light guide 1 is viewed from the direction of the arrow M, it is a parallelogram with a set of obtuse diagonals and a set of acute diagonals. Here, in order to match the curved section 15 of the light guide 1, the circuit board 2 is a turned straight-strip circuit board. When the circuit board 2 is a turned straight-strip circuit board, the portion of the circuit board 2 that fits the curved section 15 also includes a curved circuit board segment 21. Through the aforementioned turned straight-strip circuit board, the circuit board 2 and the light guide 1 can be closely fitted to avoid light leakage. In addition, through the aforementioned different shapes of the light guide 1, different product appearances can be matched. For example, when the appearance of the product is a slope, the setting of the light guide 1 can be coordinated. Figure 6B and Figure 7B The light guide 1 is shown in an inclined shape.

[0126] In some embodiments, the light emitting module 100 can be bent or wound.

[0127] To further explain the relationship between the distance between the first end 121 and the positioning surface 11 and the distance between the second end 122 and the positioning surface 11, please refer to Figures 9A to 9C ,The solid thin lines and arrows drawn in the figure are the light paths of the light, and the dotted lines are auxiliary horizontal lines.

[0128] See also Fig.9A In some embodiments, when the angle θ1 between the first side surface 12 and the second side surface 13 is 88 degrees (i.e., the angle between the first side surface 12 and the auxiliary horizontal line is +2 degrees), it can be clearly seen that Fig.9A The light entering the light guide 1 from the light incident surface 103 has many reflection and refraction paths. Fig. 9B and Fig. 9C The light has more reflected and refracted light paths, and thus more light paths leave the light emitting surface 14, so that the light emitting surface 14 presents a better luminous effect.

[0129] See also Fig. 9B In some embodiments, when the angle θ2 between the first side surface 12 and the second side surface 13 is 90 degrees, that is, when the first side surface 12 and the second side surface 13 are perpendicular to each other (that is, the angle between the first side surface 12 and the auxiliary horizontal line is 0 degrees), it can be clearly seen that Fig. 9B The light entering the light guide 1 from the light incident surface 103 has slightly more reflection and refraction paths. Fig.9A There are fewer reflected and refracted light paths; Fig. 9C The light has more reflection and refraction light paths, and thus more light paths leave the light emitting surface 14, so that the light emitting surface 14 presents a better lighting effect.

[0130] See also Fig. 9CIn some embodiments, when the angle θ3 between the first side surface 12 and the second side surface 13 is 92 degrees (that is, the angle between the first side surface 12 and the auxiliary horizontal line is -2 degrees), it can be clearly seen that Fig. 9C The light entering the light guide 1 from the light incident surface 103 has very few reflection and refraction light paths. Fig.9A and Fig. 9B The light has fewer reflection and refraction light paths, and thus fewer light paths leave the light emitting surface 14, so that the light emitting surface 14 presents a poor luminous effect.

[0131] In other words, in some embodiments, the distance between the first end 121 and the positioning surface 11 is smaller than the distance between the second end 122 and the positioning surface 11, which can improve the light effect and the brightness of the light emitting module 100. The auxiliary horizontal line refers to a horizontal line based on the positioning surface 11.

[0132] To further illustrate the relationship between the different distances between the light emitting unit 3 and the outer surface 102 in the axial direction A, please refer to Figures 10A to 10D ,The solid thin lines and arrows drawn in the figure are the light paths of the light.

[0133] At Fig. 10A In some embodiments, the distance D2 between the light emitting unit 3 and the outer surface 102 in the axial direction A is 0.5 times the width D1 of the light emitting unit 3 in the axial direction A (ie, D2 = 0.5 x D1).

[0134] At Fig. 10B In some embodiments, the distance D3 between the light emitting unit 3 and the outer surface 102 in the axial direction A is 1 times the width D1 of the light emitting unit 3 in the axial direction A (ie, D3 = 1×D1).

[0135] At Fig. 10C In some embodiments, the distance D4 between the light emitting unit 3 and the outer surface 102 in the axial direction A is 1.5 times the width D1 of the light emitting unit 3 in the axial direction A (ie, D4=1.5xD1).

[0136] At Fig. 10D In some embodiments, the distance D5 between the light emitting unit 3 and the outer surface 102 in the axial direction A is twice the width D1 of the light emitting unit 3 in the axial direction A (ie, D5 = 2xD1).

[0137] In some embodiments, simulation analysis shows that when the distance between the light emitting unit 3 and the outer side surface 102 in the axial direction A is wider, it has better light effect to improve the brightness of the light emitting module 100. In particular, when the distance between the light emitting unit 3 and the outer side surface 102 in the axial direction A is 1.5 to 2 times the width of the light emitting unit 3 in the axial direction A, it has better light effect. FIG. 10A to FIG. 10D , the order of excellence of light effect is Fig. 10D > Fig. 10C > Fig. 10B > Fig. 10A The ratio of the distance between the light emitting unit 3 and the outer surface 102 in the axial direction A to the width of the light emitting unit 3 in the axial direction A has a linkage relationship in terms of light effect.

[0138] In some embodiments, the circuit board 2 is a flexible circuit board, and is a light-proof flexible circuit board. The light-proof flexible circuit board is light-proof itself or a light-absorbing coating layer is set on the outer surface of the circuit board 2 (not shown). In some embodiments, the structure from the outside to the inside is the light-absorbing coating layer on the outer surface of the circuit board 2, the circuit board 2, and the third reflective coating layer 4" on the inner surface of the circuit board 2.

[0139] See also Figure 2B In some embodiments, the light emitting direction of the light emitting unit 3 is perpendicular to the circuit board 2. The light emitted by the light emitting unit 3 enters the light guide 1 from the light incident surface 103 of the groove 10, is reflected by at least one of the first side surface 12 and the second side surface 13, and leaves the light guide 1 from the light emitting surface 14. In some embodiments, the light emitting unit 3 emits light from a single side, and the light emitting surface is the surface of the light emitting unit 3 opposite to the first side surface 12.

[0140] Thus, according to some embodiments, by combining the light guide, the reflective coating layer and the light absorbing coating layer, the light emitted by the light emitting unit can be deflected and reflected, and the distance of the light path projected to the light emitting surface can be increased, so as to reduce the stacking thickness requirement of the light emitting module, shorten the height requirement of the light guide, reduce the distance required for light averaging from the light emitting unit to the light emitting surface, and improve the brightness and uniformity of the light emitting module. According to some embodiments, the light emitting module has weight and space advantages.

Claims

1. A light emitting module, characterized in that: Include: A light guide, comprising a positioning surface, a first side surface, a second side surface and a light emitting surface, the positioning surface comprising a groove, the positioning surface connecting the second side surface and the light emitting surface, the second side surface connecting the first side surface, and the first side surface connecting the light emitting surface; A first reflective coating layer is disposed on the first side surface; a first light-absorbing paint layer, disposed on the first reflective paint layer; a circuit board located on the positioning surface; and A light emitting unit is disposed on the circuit board and accommodated in the groove.

2. The light emitting module according to claim 1, characterized in that: The light-emitting module also includes: a second reflective coating layer disposed on the second side surface; and A second light absorbing paint layer is disposed on the second reflective paint layer.

3. The light emitting module according to claim 1, characterized in that: The light emitting module further comprises a third reflective coating layer disposed on an inner surface of the circuit board.

4. The light emitting module according to claim 1, characterized in that: The light-emitting module also includes: a fourth reflective coating layer disposed on the positioning surface; and A third light-absorbing paint layer is disposed on the fourth reflective paint layer.

5. The light emitting module according to claim 1, characterized in that: The two ends of the first side surface respectively include a first end and a second end, the first end is connected to the light emitting surface, and the second end is connected to the second side surface, and the distance between the first end and the positioning surface is smaller than the distance between the second end and the positioning surface.

6. The light emitting module according to claim 1, characterized in that: The included angle between the first side surface and the second side surface is 88 to 90 degrees.

7. The light emitting module according to claim 1, characterized in that: An axial direction perpendicular to the second side surface is a first axial direction, and a width of the groove in the first axial direction is greater than a width of the light emitting unit in the first axial direction.

8. The light emitting module according to claim 1, characterized in that: The groove contains: an inner side surface, adjacent to the second side surface; an outer side surface, close to the light emitting surface; and a light incident surface connecting the inner side surface and the outer side surface; The axis perpendicular to the second side surface is a first axis, and the distance between the light emitting unit and the outer side surface in the first axis is 1.5 to 2 times the width of the light emitting unit in the first axis.

9. The light emitting module according to claim 1, characterized in that: An axial direction perpendicular to the positioning surface is a second axial direction, and a height of the groove in the second axial direction is greater than a height of the light emitting unit in the second axial direction.

10. The light emitting module according to claim 1, characterized in that: The axis perpendicular to the second side surface is a first axis, the distance between the light-emitting unit and the second side surface in the first axis is smaller than the distance between the light-emitting unit and the light-emitting surface in the first axis, and the distance between the groove and the second side surface in the first axis is smaller than the distance between the groove and the light-emitting surface in the first axis.

11. The light emitting module according to claim 1, characterized in that: It comprises a plurality of light emitting units, and each of the light emitting units is equidistantly arranged on the circuit board.

12. The light emitting module according to claim 1, characterized in that: The positioning surface includes a plurality of grooves and a rib. The rib is located between the grooves. The surface of the rib is coplanar with the positioning surface, and the circuit board is located on the surface of the rib.

13. The light emitting module according to claim 1, characterized in that: The positioning surface further comprises a convex rib at two ends close to the light emitting surface and the second side surface respectively.

14. The light emitting module according to claim 1, characterized in that: The area of ​​the first reflective coating layer is smaller than or equal to the area of ​​the first light absorbing coating layer.

15. The light emitting module according to claim 1, characterized in that: The first side surface includes a first area and a second area. The first area connects the light emitting surface and the second area. The second area connects the second side surface. The first reflective coating layer is disposed in the second area. The first light absorbing coating layer is disposed in the first area and the second area.

16. The light emitting module according to claim 1, characterized in that: The light emitting surface includes a vertical light emitting surface and an oblique light emitting surface, the oblique light emitting surface is connected to the vertical light emitting surface and the first side surface, the angle between the oblique light emitting surface and the vertical light emitting surface is an obtuse angle, and the angle between the oblique light emitting surface and the first side surface is an obtuse angle.

17. The light emitting module according to claim 16, characterized in that: The axial direction perpendicular to the positioning surface is a second axial direction, and the projection length of the oblique light-emitting surface on the second axial direction is smaller than the projection length of the vertical light-emitting surface on the second axial direction.

18. The light emitting module according to claim 1, characterized in that: The light guide component also includes a microstructure disposed on the light emitting surface.

19. The light emitting module according to claim 1, characterized in that: The light guide member is an annular light guide structure, and the side edge of the light guide member has a curved section.

20. The light emitting module according to claim 1, characterized in that: The light emitting direction of the light emitting unit is perpendicular to the circuit board. The light emitted by the light emitting unit enters the light guide from a light incident surface of the groove, is reflected by at least one of the first side surface and the second side surface, and leaves the light guide from the light emitting surface.

21. The light emitting module according to claim 1, characterized in that: The axis perpendicular to the second side surface is a first axis, the axis perpendicular to the positioning surface is a second axis, the first axis is perpendicular to the second axis, the thickness of the light-emitting module in the second axis is less than or equal to 1.5 mm, and the distance from the light-emitting unit to the light-emitting surface in the first axis is less than or equal to 6 mm.

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