TWI678561B - Light mixing lens - Google Patents

Abstract

A light mixing lens includes a light entrance side, a light exit side, and a ring-shaped side wall. The annular side wall has a concave upper section and a concave lower section, and the first lower edge of the concave upper section is connected to the light-entering side. The second upper edge and the second lower edge of the concave lower segment are respectively connected to the light emitting side and the first upper edge of the concave upper segment. Side concave portions are disposed on the first internal reflection surface concave upward and on the second internal reflection surface concave downward. The side concave portion extends from the first lower edge to the second upper edge. The side concave portion has a first side edge and a second side. Edge and a reflective concave surface connecting the first side edge and the second side edge. In a section of the undercut, the length of the straight line between the first and second sides is 2a, the distance between the two points on the line is L1, and the distance from the two points to a point on the reflective concave surface The distances are L2 and L3, the sum of L2 and L3 is 2a, and 2a is greater than L1.

Description

Mixed lens

The invention relates to a lens, in particular to a light-mixing lens.

The total internal reflection lens is designed for a wide irradiation area by controlling the incident angle of the internal total reflection surface so that the light traces cross to achieve a larger half angle of illumination. The design concept of the light mixing lens is to superimpose light of different wavelengths to form white light, so the light traces are designed to focus on the same position to focus the light of different wavelengths on the same position. Due to the difference between the basic design principle of the wide irradiation area and the mixed light, when designing the wide irradiation area of a multi-chip light source or a red, green, blue, and white color light source in the prior art, the total internal reflection lens will have a light trace Excessive crossover causes uneven light mixing. Therefore, the prior art has not been able to provide a lens that can meet the requirements of both mixed light and wide irradiation area.

This "prior art" paragraph is only used to help understand the content of the present invention, so the content disclosed in the "prior art" may include some conventional technologies that do not constitute the ordinary knowledge of those skilled in the art. In addition, the content disclosed in the "prior art" does not represent the content or the problem to be solved by one or more embodiments of the present invention, nor does it mean that prior to the application of the present invention, it has been used by those with ordinary knowledge in the technical field to which it belongs. Know or know.

The invention provides a light mixing lens, which can meet the requirements for the mixed light and wide irradiation area of a multi-chip light source or a red, green, blue, and white color light source.

The light-mixing lens provided by the present invention includes a light-entering side, a light-exiting side, and an annular side wall. The annular side wall is connected between the light entrance side and the light exit side and has a concave upper section and a concave downward section. The concave upper section has a first upper edge, a first lower edge, and a first upper edge and a first lower edge. The first internal reflection surface and the first lower edge are connected to the light incident side. The concave downward section has a second upper edge, a second lower edge, and a second internal reflecting 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 undercut portions are arranged on the first and second inner reflection surfaces, each undercut portion extends from a first lower edge to a second upper edge, each undercut portion has a first side edge, a second side edge, and is connected to A reflective concave surface between the first side edge and the second side edge. On a section of each side recess, a straight line with a length of 2a is formed between the first side edge and the second side edge. The distance between the two points on the line is L1, and the two points on the line reach a point on the reflective concave surface. The distances are L2 and L3, and the sum of L2 and L3 is 2a, and 2a is greater than L1.

In an embodiment of the present invention, the light incident side and the light exit side are arranged along a first axis, the first axis, the second axis, and the third axis intersect at an intersection and are perpendicular to each other, and the second axis and the third axis are formed The plane intersecting with each undercut forms the cross section of each undercut described above.

In an embodiment of the present invention, a distance between the first side edge and the second side edge of each of the side concave portions is gradually increased from a light exit side toward a light entrance side.

In an embodiment of the present invention, the first internal reflection surface, the second internal reflection surface, and the reflective concave surface are total reflection surfaces.

In an embodiment of the present invention, the light incident side further includes a bottom concave portion, and the bottom concave portion extends from the light incident side toward the light exit side.

In an embodiment of the present invention, the bottom concave portion further includes a top surface and a side surface of the ring. The side surface of the ring has opposite ends. One end of the side surface of the ring is connected to the top surface. The other end of the side surface of the ring surrounds to form a bottom opening. The diameter of the opening is larger than the diameter of the top surface.

In an embodiment of the present invention, 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 arranged around the top concave portion.

In an embodiment of the present invention, the top concave portion further includes a bottom surface and a side surface of the ring. The side surface of the ring has opposite ends. One end of the side surface of the ring is connected to the bottom surface. The other end of the side surface of the ring surrounds the top opening. The aperture is larger than the diameter of the bottom surface, and the light emitting surface is arranged around the top opening of the top concave portion.

In an embodiment of the present invention, the above-mentioned light-mixing lens further includes a plurality of light-diffusing microstructures disposed on the light-exiting side.

In an embodiment of the present invention, the light diffusion microstructures are arranged in a honeycomb shape.

Through the concave upper part, concave lower part and side concave part of the annular side wall, the light emitted by the multi-chip light source or the red, green, blue, and white colored light source can pass through the light mixing lens of the present invention to form a uniform mixture and have a wide irradiation area. Emitted light. Therefore, the light-mixing lens of the present invention can meet the requirements for the mixed light of a multi-chip light source or a red-green-blue-white color light source and a wide irradiation area.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, embodiments are described below in detail with reference to the accompanying drawings, as follows.

10‧‧‧ mixed light lens

110‧‧‧Incoming light side

111‧‧‧ bottom recess

1111‧‧‧Top

1112‧‧‧Side of the ring

1113‧‧‧ bottom opening

120‧‧‧light side

121‧‧‧Top recess

1211‧‧‧ Underside

1212‧‧‧Side of the ring

1213‧‧‧Top opening

122‧‧‧Outside

130‧‧‧ annular side wall

131‧‧‧ concave upward

1311‧‧‧First internal reflection surface

132‧‧‧ concave down

1321‧‧‧Second internal reflection surface

133‧‧‧ undercut

1331‧‧‧First side edge

1332‧‧‧Second side edge

1333‧‧‧Reflective concave surface

140‧‧‧light diffusion microstructure

20‧‧‧ light source

A, B, P‧‧‧ points

Areas C, E‧‧‧

D-D‧‧‧ Secant

D1, D2‧‧‧ diameter

R1, R2‧‧‧ aperture

X‧‧‧Second axis

Y‧‧‧ third axis

Z‧‧‧ first axis

1 is a schematic perspective view of a mixed light lens according to an embodiment of the present invention; FIG. 2 is a schematic side plan view of a mixed light lens according to an embodiment of the present invention; FIG. 3 is an enlarged view of a region C in FIG. 2; 4 is a schematic bottom plan view of a light mixing lens according to an embodiment of the present invention; FIG. 5 is a cross-sectional view taken along a DD secant line in FIG. 2; FIG. 6 is an enlarged view of an E area in FIG. 5; FIG. 8 is a schematic diagram of a top view of a mixed lens according to an embodiment of the present invention.

The foregoing 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 the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, top, bottom, side, etc., are only directions referring to the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

FIG. 1 is a schematic perspective view of a light mixing lens according to an embodiment of the present invention. FIG. 2 is a schematic side plan view of a light mixing lens according to an embodiment of the present invention. FIG. 3 is an enlarged view of a region C in FIG. 2. 4 is a schematic bottom plan view of a light mixing lens according to an embodiment of the present invention. Fig. 5 is a cross-sectional view taken along the line D-D in Fig. 2. FIG. 6 is an enlarged view of an E area in FIG. 5. FIG. 7 is a schematic diagram of using a light mixing lens according to an embodiment of the present invention. Please refer to FIGS. 1 to 7. The light mixing lens 10 of this embodiment includes a light incident side 110, a light exit side 120, and an annular side wall 130. The annular side wall 130 is connected between the light-incident side 110 and the light-exit side 120 and has a concave upper section 131 and a concave downward section 132. The concave upper 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. The first lower edge is connected to the light-incoming side 110. The concave lower section 132 has a second upper edge, a second lower edge, and a second internal reflecting surface 1321 connected between the second upper edge and the second lower edge. The second upper edge is connected to the light emitting side 120 and the second lower edge is connected. First upper edge. The first internal reflection surface 1311 and the second internal reflection surface 1321 are provided with a plurality of undercut portions 133. Each undercut portion 133 extends from a first lower edge to a second upper edge. Each undercut portion 133 has a first side edge 1331, a first Two side edges 1332 and a reflective recess connected between the first side edge 1331 and the second side edge 1332 面 1333. In the cross section of each side recess 133, a straight line is formed between the first side edge 1331 and the second side edge 1332. The length of the straight line is 2a, and the distance between the two points A and B on the straight line is L1 (not shown in the figure). ), The distances between the two different points A and B to the point P on the reflective concave surface 1333 are L2 (not labeled) and L3 (not labeled), and the sum of L2 and L3 is 2a, and 2a is greater than L1; that is, That is, in the cross section of each side recess 133, the relationship between the straight line formed by the connection between the first side edge 1331 and the second side edge 1332 and the reflective concave surface 1333 conforms to the ellipse equation. The straight line formed by the connection between the one side edge 1331 and the second side edge 1332 and the reflective concave surface 1333 constitute 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 material of the light mixing lens 10 may be glass or plastic.

The light incident side 110 and the light exit 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. The second axis X and the third axis Y The formed plane XY intersects each side recessed portion 133 to form a cross section of each side recessed portion 133. In addition, the distance L1 between the first side edge 1331 and the second side edge 1332 of each side recess 133 gradually increases from the light exit side 120 toward the light entrance side 110.

The light incident side 110 described above may further include a bottom concave portion 111, and the bottom concave portion 111 extends from the light incident side 110 toward the light exit 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 this embodiment, the bottom concave portion 111 may include a top surface 1111 and a ring side surface 1112. The ring side surface 1112 has opposite ends. One end of the ring side surface 1112 is connected to the top surface 1111. The other end of the ring side surface 1112 surrounds the bottom opening. 1113, and the hole diameter R1 of the bottom opening 1113 is larger 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.

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. this 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 opposite ends. One end of the ring side surface 1212 is connected to the bottom surface 1211. The other end of the ring side surface 1212 surrounds and forms a top opening 1213. In detail, in this embodiment, the aperture R2 of the top opening 1213 may be larger 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 ring side surface 1212 and the bottom surface 1211 may be 100 °, but is not limited thereto.

When the light mixing lens 10 of this embodiment is used, the light source 20 can be placed in the bottom concave portion 111. When the light emitted from the light source 20 enters the light mixing lens 10 from the light incident side 110, it is refracted to form a first moving toward the annular side wall 130. Refracted light. The first refracted light is totally reflected by the concave upper section 131 and concave downward section 132 of the annular side wall 130, and can form cross, collimation, and divergence light and exit 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 reflected by the undercut 133 in a direction parallel to the second axis X. , Finally emitted from the light emitting surface 122. It can be seen that after the functions of the concave upper section 131, the concave downward section 132, and the side concave section 133, when the light emitted by the multi-chip light source 20 or the red-green-blue-white colored light source 20 enters the After the light mixing lens 10, different types of light, such as cross, collimation, and divergence, and / or light traveling in different directions can be formed. According to this, the light emitted by the multi-chip light source 20 or the red, green, blue, and white color light source 20 passes through the light mixing lens 10 of this embodiment to form the emitted light (emitted from the light emitting side 122) with a uniform and 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 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 in this embodiment. In addition, when the raw material of the light mixing lens 10 of this embodiment is plastic, the molding cycle can also be reduced.

8 is a schematic top plan view of a light mixing lens according to an embodiment of the present invention. Please refer to FIGS. 1, 7 and 8. The light mixing lens 10 in this embodiment may further include a plurality of light diffusing microstructures 140 disposed on the light emitting side 120. The light diffusion microstructure 140 may be formed by printing or laser etching the light side 120, but is not limited thereto. The light diffusion microstructure 140 may also be formed on the light exit side 120 by injection molding. The shape of the light diffusion microstructure 140 may be, for example, a hemispherical bump, a spherical crown bump, a rectangular parallelepiped bump, a hexagonal bump, a hemispherical recess, a spherical crown recess, a rectangular parallelepiped recess, or a hexagonal recess. Points, etc., but the invention is not limited to this. Specifically, in this embodiment, the light diffusion microstructure 140 is disposed on the light exit surface 122 of the light exit side 120. In addition, the arrangement manner of the light diffusion microstructures 140 may be a honeycomb shape, but is not limited thereto. The light diffusing microstructure 140 can destroy the total reflection of light on the light exit surface of the light mixing lens 10, improve the ratio of light in the light mixing lens 10 from the light exit side 120, thereby improving the brightness of the light exit side 120, and at the same time, the light diffusion microstructure 140 The angle of incidence and refraction of light entering the air from the light exit surface of the light mixing lens 10 can be changed to achieve the effects of re-divergence and expansion of the angle.

In summary, the light mixing lens according to the embodiment of the present invention can improve the light mixing uniformity of light emitted by a multi-chip light source or a red, green, blue, and white color light source by concave upward, concave downward, and side concave portions. And irradiation area.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains may make some modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the appended patent application.

Claims (10)

A light mixing lens includes:
A light entrance side;
A light exit side; and an annular side wall connected between the light entrance side and the light exit side, and having a concave upper section and a concave downward section, the concave upper section having a first upper edge and 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 is connected to the light incident side, and the recess has a second upper edge, a second lower edge An edge and a second internal reflection surface connected between the second upper edge and the second lower edge, the second upper edge connected to the light exit side, and the second lower edge connected to the first upper edge;
Wherein, the first internal reflection surface and the second internal reflection surface are provided with a plurality of undercut portions, each of the undercut portions extends from the first lower edge to the second upper edge, and each of the undercut portions has a first One 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 side concave portions, the first side edge and the A straight line is formed between the second side edges. The length of the straight line is 2a. The distance between the two different points on the straight line is L1. The distances between the two different points and a point on the reflective concave surface are L2 and L3 and L2, respectively. The sum with L3 is 2a, and 2a is greater than L1. The light-mixing lens according to claim 1, wherein the light-entering side and the light-exiting side are arranged along a first axis, and the first axis, a second axis, and a third axis intersect at an intersection and are perpendicular to each other. A plane formed by the second axis and the third axis intersects each of the undercut portions to form the cross-section of each of the undercut portions. The light mixing lens according to claim 1, wherein a distance between the first side edge and the second side edge of each of the side concave portions gradually increases from the light exit side toward the light entrance side. 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. The light mixing lens according to claim 1, wherein the light incident side further includes a bottom concave portion, and the bottom concave portion extends from the light incident side toward the light exit side. The light-mixing lens according to claim 5, wherein the bottom concave portion further includes a top surface and a ring side surface, the ring side surface has opposite ends, one end of the ring side surface is connected to the top surface, and the other side of the ring side surface A bottom opening is formed around one end, and the aperture of the bottom opening is larger than the diameter of the top surface. The light mixing lens according to claim 1, wherein the light exit side further includes a top concave portion and a light exit surface, the top concave portion extends from the light exit side toward the light entrance side, and the light exit surface is arranged around the top concave portion . The light mixing lens according to claim 7, wherein the top concave portion further includes a bottom surface and a ring side surface, the ring side surface has opposite ends, one end of the ring side surface is connected to the bottom surface, and the other end of the ring side surface surrounds A top opening is formed, 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. The light mixing lens according to claim 1, wherein the light mixing lens further includes a plurality of light diffusion microstructures, and the light diffusion microstructures are disposed on the light exit side. The light mixing lens according to claim 9, wherein the light diffusion microstructures are arranged in a honeycomb shape.