Mixed light lens

Abstract

A light mixing lens comprises a light incident side, a light emitting side and an annular side wall. The annular side wall comprises a concave upward section and a concave downward section, wherein the first lower edge of the concave upward section is connected to the light incident side. The second upper edge and the second lower edge of the concave downward section are respectively connected to the light emitting side and the first upper edge of the concave upward section. A side concave portion is arranged on the first internal reflection surface of the concave upward section and the second internal reflection surface of the concave downward section, wherein the side concave portion extends from the first lower edge to the second upper edge, and the side concave portion comprises a first side edge, a second side edge and a reflective concave surface connecting the first side edge and the second side edge. On a cross section of the side concave portion, the length of the straight line between the first side edge and the second side edge is 2a, the distance between two different points on the straight line is L1, and the distances from the two different points to a point on the reflective concave surface are L2 and L3 respectively, the sum of L2 and L3 is 2a, and 2a is greater than L1.

Description

Technical Field

[0001] The invention relates to a lens, in particular to a light-mixing lens. Background Art

[0002] When a total internal reflection lens is designed for a wide illumination area, the incident angle of the total internal reflection surface is controlled so that the light paths cross to achieve a larger illumination half-angle. The design concept of a light mixing lens is to overlap lights of different wavelengths to form white light, so the light paths are designed to converge toward the same position to focus lights of different wavelengths at the same position. Due to the difference in the basic design principles of wide illumination area and light mixing, when the total internal reflection lens of conventional technology is designed for the needs of a wide illumination area of ​​a multi-chip light source or a red, green, blue, and white color light source, there will be a problem of uneven light mixing due to excessive light path intersections. Therefore, conventional technology has not yet been able to provide a lens that can take into account the needs of light mixing and a wide illumination area.

[0003] This "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" may contain some conventional technologies that are not known to those with ordinary knowledge in the relevant technical field. In addition, the content disclosed in the "background technology" does not represent the content or the problems to be solved by one or more embodiments of the present invention, nor does it mean that it has been known or recognized by those with ordinary knowledge in the relevant technical field before the application of the present invention. Summary of the invention

[0004] The present invention provides a light mixing lens which can take into account the requirements of light mixing and wide irradiation area for a multi-chip light source or a red, green, blue and white color light source.

[0005] The mixed light lens provided by the present invention includes a light incident side, a light emitting side and an annular side wall. The annular side wall is connected between the light incident side and the light emitting side and has a concave upward section and a concave downward section, the concave upward section has a first upper edge, a first lower edge and a first internal reflection surface connected between the first upper edge and the first lower edge, and the first lower edge is connected to the light incident side. The concave downward section has a second upper edge, a second lower edge and a second internal reflection surface connected between the second upper edge and the second lower edge, the second upper edge is connected to the light emitting side, and the second lower edge is connected to the first upper edge. A plurality of side recesses are arranged on the first internal reflection surface and the second internal reflection surface, each of which extends from the first lower edge to the second upper edge, and each of which has a first side edge, a second side edge and a reflective concave surface connected between the first side edge and the second side edge. On a cross-section of each side concave portion, a straight line with a length of 2a is formed between the first side edge and the second side edge, the distance between two different points on the straight line is L1, and the distances from the two different points to a point on the reflective concave surface are L2 and L3 respectively, the sum of L2 and L3 is 2a, and 2a is greater than L1.

[0006] By means of the concave upper section, concave lower section and side concave portion of the annular side wall, the light emitted by the multi-chip light source or the red, green, blue and white color light source can form a uniformly mixed emitted light with a wide irradiation area after passing through the light mixing lens of the present invention. Therefore, the light mixing lens of the present invention can meet the requirements of light mixing and wide irradiation area for the multi-chip light source or the red, green, blue and white color light source.

[0007] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic diagram of a three-dimensional appearance of a light mixing lens according to an embodiment of the present invention;

[0009] Figure 2 is a side plan view schematic diagram of a light mixing lens according to an embodiment of the present invention;

[0010] Figure 3 for Figure 2 Enlarged view of the middle C area;

[0011] Figure 4 is a bottom-view schematic diagram of a light-mixing lens according to an embodiment of the present invention;

[0012] Figure 5 For along Figure 2 Sectional view of the DD secant line;

[0013] Figure 6 for Figure 5 Enlarged view of the middle E area;

[0014] Figure 7 A schematic diagram of the use of a light-mixing lens according to an embodiment of the present invention; and

[0015] Figure 8 FIG. 4 is a top plan view of a light mixing lens according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to one of the drawings. The directional terms mentioned in the following embodiments, such as up, down, top, bottom, side, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0017] Figure 1 FIG. 4 is a schematic diagram of a three-dimensional appearance of a light mixing lens according to an embodiment of the present invention. Figure 2 FIG. 4 is a side plan view of a light mixing lens according to an embodiment of the present invention. Figure 3 for Figure 2 Magnified view of area C. Figure 4 FIG. 4 is a bottom plan view of a light mixing lens according to an embodiment of the present invention. Figure 5 For along Figure 2 Sectional view of the DD secant line. Figure 6 for Figure 5 Magnified view of area E in the middle. Figure 7 This is a schematic diagram of the use of a light-mixing lens according to an embodiment of the present invention. Figures 1 to 7 The light mixing lens 10 of this embodiment includes a light incident side 110, a light emitting side 120, and an annular sidewall 130. The annular sidewall 130 is connected between the light incident side 110 and the light emitting side 120, and has a concave upward section 131 and a concave downward section 132. The concave upward section 131 has a first upper edge, a first lower edge, and a first internal reflection surface 1311 connected between the first upper edge and the first lower edge, and the first lower edge is connected to the light incident side 110. The concave downward section 132 has a second upper edge, a second lower edge, and a second internal reflection surface 1321 connected between the second upper edge and the second lower edge, and the second upper edge is connected to the light emitting side 120, and the second lower edge is connected to the first upper edge. A plurality of side recesses 133 are disposed on the first internal reflection surface 1311 and the second internal reflection surface 1321 . Each side recess 133 extends from a first lower edge to a second upper edge. Each side recess 133 has a first side edge 1331 , a second side edge 1332 and a reflective concave surface 1333 connected between the first side edge 1331 and the second side edge 1332 . On the cross section of each side concave portion 133, the first side edge 1331 and the second side edge 1332 are connected to form a straight line, the length of the straight line is 2a, the distance between two different points A and B on the straight line is L1 (not shown in the figure), the distances between two different points A and B to point P on the reflective concave surface 1333 are L2 (not shown in the figure) and L3 (not shown in the figure), the sum of L2 and L3 is 2a, and 2a is greater than L1; that is, on the cross section of each side concave portion 133, the relationship between the straight line formed by connecting the first side edge 1331 and the second side edge 1332 and the reflective concave surface 1333 conforms to the ellipse equation, and on the cross section of each side concave portion 133, the straight line formed by connecting the first side edge 1331 and the second side edge 1332 and the reflective concave surface 1333 form a semi-ellipse. In addition, the first internal reflection surface 1311, the second internal reflection surface 1321 and the reflective concave surface 1333 are total reflection surfaces. In addition, the light mixing lens 10 can be made of glass or plastic.

[0018] The light incident side 110 and the light emitting side 120 may be arranged along the first axis Z. The first axis Z, the second axis X, and the third axis Y intersect at an intersection and are perpendicular to each other. A plane XY formed by the second axis X and the third axis Y intersects with each side recess 133 to form a cross section of each side recess 133. In addition, a distance L1 between a first side edge 1331 and a second side edge 1332 of each side recess 133 gradually increases from the light emitting side 120 toward the light incident side 110.

[0019] The light incident side 110 may further include a bottom concave portion 111, which extends from the light incident side 110 toward the light emitting side 120. The cross-section of the bottom concave portion 111 may be a geometric shape or a non-geometric shape such as a rectangle, a circle, a trapezoid, or a triangle. In the present embodiment, the bottom concave portion 111 may include a top surface 1111 and a ring side surface 1112, wherein the ring side surface 1112 has two opposite ends, one end of the ring side surface 1112 is connected to the top surface 1111, and the other end of the ring side surface 1112 surrounds to form a bottom opening 1113, and the aperture R1 of the bottom opening 1113 is greater than the diameter D1 of the top surface 1111. The aperture R1 of the bottom opening 1113 may be, for example, 9 millimeters (mm), and the diameter D1 of the top surface 1111 may be, for example, 8 mm, but is not limited thereto.

[0020] The light emitting side 120 may further include a top concave portion 121 and a light emitting surface 122. The top concave portion 121 extends from the light emitting side 120 toward the light incident side 110, and the light emitting surface 122 is disposed around the top concave portion 121. The cross-section of the top concave portion 121 may be a geometric shape or a non-geometric shape such as a rectangle, a circle, a trapezoid, or a triangle. In addition, the top concave portion 121 may further include a bottom surface 1211 and a ring side surface 1212. The ring side surface 1212 has two opposite ends, one end of the ring side surface 1212 is connected to the bottom surface 1211, and the other end of the ring side surface 1212 surrounds to form a top opening 1213. In detail, in the present embodiment, the aperture R2 of the top opening 1213 may be greater than the diameter D2 of the bottom surface 1211, and the light emitting surface 122 is disposed around the top opening 1213 of the top concave portion 121. The aperture R2 of the top opening 1213 may be, for example, 33 mm to 35 mm, the diameter D2 of the bottom surface 1211 may be, for example, 31 mm to 33 mm, and the angle α between the annular side surface 1212 and the bottom surface 1211 may be 100°, but is not limited thereto.

[0021] When the light-mixing lens 10 of this embodiment is in use, the light source 20 can be placed in the bottom concave portion 111. When the light emitted by the light source 20 enters the light-mixing lens 10 from the light-entering side 110, it is refracted to form a first refracted light that moves toward the annular side wall 130. The first refracted light is totally reflected by the concave upper section 131 and the concave lower section 132 of the annular side wall 130, and can form crossed, collimated, and divergent light and be emitted from the light-emitting surface 122. In addition, when the first refracted light on the plane YZ formed by the first axis Z and the third axis Y reaches the annular side wall 130, it can also be totally reflected by the side concave portion 133 and reflected in a direction parallel to the second axis X, and finally emitted from the light-emitting surface 122. It can be seen that, through the effects of the concave upper section 131, the concave lower section 132 and the side concave portion 133, when the light emitted by the multi-chip light source 20 or the red, green, blue and white type color light source 20 enters the light mixing lens 10 of this embodiment from the light entrance side 110, it can form different types of light such as cross, collimated and divergent or / and move in different directions. Accordingly, after the light emitted by the multi-chip light source 20 or the red, green, blue and white type color light source 20 passes through the light mixing lens 10 of this embodiment, it can form an emitted light (emitted from the light exit side 122) that is evenly mixed and has a wide irradiation area. Therefore, the light mixing lens 10 of this embodiment can take into account the requirements for the mixed light and wide irradiation area of ​​the multi-chip light source 20 or the red, green, blue and white type color light source 20. In addition, the top concave portion 121 can reduce the overall weight and raw materials of the light mixing lens 10 of this embodiment. Moreover, when the raw material of the light mixing lens 10 of this embodiment is plastic, the molding cycle can also be reduced.

[0022] Figure 8 This is a top plan view of a light mixing lens according to an embodiment of the present invention. Figure 1 , 7and 8. The hybrid lens 10 of the present embodiment may further include a plurality of light diffusion microstructures 140 disposed on the light emitting side 120. The light diffusion microstructures 140 may be formed by printing or laser etching the light emitting side 120, but the present invention is not limited thereto. The light diffusion microstructures 140 may also be formed on the light emitting side 120 by injection molding. The shape of the light diffusion microstructures 140 may be, for example, hemispherical convex points, spherical crown convex points, rectangular convex points, hexagonal convex points, hemispherical concave points, spherical crown concave points, rectangular concave points, hexagonal concave points, etc., but the present invention is not limited thereto. In detail, in the present embodiment, the light diffusion microstructures 140 are disposed on the light emitting surface 122 of the light emitting side 120. In addition, the arrangement of the light diffusion microstructures 140 may be honeycomb-shaped, but the present invention is not limited thereto. The light diffusion microstructure 140 can destroy the total reflection of light at the light exiting surface of the light mixing lens 10, increase the proportion of light in the light mixing lens 10 exiting from the light exiting side 120, and thus increase the brightness of the light exiting side 120. At the same time, the light diffusion microstructure 140 can change the incident angle and refraction angle of light entering the air from the light exiting surface of the light mixing lens 10, thereby achieving the effect of re-divergence and angle expansion.

[0023] In summary, the light mixing lens of the embodiment of the present invention can improve the light mixing uniformity and irradiation area of ​​the light emitted by the multi-chip light source or the red, green, blue and white color light source by means of the concave upper section, the concave lower section and the side concave portion.

[0024] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A mixed light lens, characterized in that: include: One is the light-entry side; One light-emitting side; as well as an annular side wall connected between the light incident side and the light emitting side, and having a concave upward section and a concave downward section, the concave upward section having a first upper edge, a first lower edge, and a first internal reflection surface connected between the first upper edge and the first lower edge, the first lower edge being connected to the light incident side, the concave downward section having a second upper edge, a second lower edge, and a second internal reflection surface connected between the second upper edge and the second lower edge, the second upper edge being connected to the light emitting side, and the second lower edge being connected to the first upper edge; Wherein, a plurality of side recesses are arranged on the first inner reflection surface and the second inner reflection surface, each of the plurality of side recesses extends from the first lower edge to the second upper edge, and each of the plurality of side recesses has a first side edge, a second side edge and a reflective concave surface connected between the first side edge and the second side edge; and, on a cross-section of each of the plurality of side recesses, a straight line is formed between the first side edge and the second side edge, the length of the straight line is 2a, the distance between two different points on the straight line is L1, the distances from the two different points to a point on the reflective concave surface are L2 and L3 respectively, the sum of L2 and L3 is 2a, and 2a is greater than L1.

2. The mixed light lens according to claim 1, characterized in that: The light incident side and the light emitting side are arranged along a first axis, the first axis, a second axis and a third axis intersect at an intersection and are perpendicular to each other, and a plane formed by the second axis and the third axis intersects with each of the multiple side recesses to form the cross-section of each of the multiple side recesses.

3. The light mixing lens according to claim 1, wherein: The distance between the first side edge and the second side edge of each of the plurality of side recesses gradually increases from the light emitting side toward the light incident side.

4. The light mixing lens according to claim 1, wherein: The first internal reflection surface, the second internal reflection surface and the reflective concave surface are total reflection surfaces.

5. The mixed light lens according to claim 1, wherein: The light incident side further includes a bottom concave portion extending from the light incident side toward the light emitting side.

6. The light mixing lens according to claim 5, characterized in that: The bottom recess further includes a top surface and a ring side surface, the ring side surface has two opposite ends, one end of the ring side surface is connected to the top surface, and the other end of the ring side surface is surrounded to form a bottom opening, and the aperture of the bottom opening is larger than the diameter of the top surface.

7. The light mixing lens according to claim 1, wherein: The light-emitting side further includes a top concave portion and a light-emitting surface. The top concave portion extends from the light-emitting side toward the light-incident side, and the light-emitting surface is disposed around the top concave portion.

8. The light mixing lens according to claim 7, wherein: The top recess further includes a bottom surface and a ring side surface, the ring side surface has two opposite ends, one end of the ring side surface is connected to the bottom surface, and the other end of the ring side surface is surrounded to form a top opening, the aperture of the top opening is larger than the diameter of the bottom surface, and the light emitting surface is arranged around the top opening of the top recess.

9. The light mixing lens according to claim 1, wherein: The light mixing lens further includes a plurality of light diffusion microstructures, and the plurality of light diffusion microstructures are disposed on the light exiting side.

10. The light mixing lens according to claim 9, wherein: The plurality of light diffusion microstructures are arranged in a honeycomb shape.

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