A TIR collimating lens

Abstract

The present invention discloses a TIR collimating lens, which relates to the field of LED light source technology. The lens comprises a first surface, which is arranged in the middle of the TIR collimating lens and is a refractive surface; a second surface, which is arranged on one side of the refractive surface; a third surface, which is arranged on the side of the second surface away from the refractive surface and is a total reflection surface; a fourth surface, which is arranged on the side of the third surface away from the second surface; a fifth surface, which is arranged on the side of the fourth surface away from the third surface; a sixth surface, which is arranged on the side of the fifth surface away from the fourth surface and is a total reflection surface; and a seventh surface, which is arranged on the side of the sixth surface away from the fifth surface. A light source is provided on the side of the TIR collimating lens close to the first surface. The present invention has the beneficial effect of not only effectively removing stray light but also reducing the height of the lens.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and in particular to a TIR collimating lens. Background Art

[0002] The direct output light from an LED light source has a large beam angle. When used for long-distance lighting, the target surface receives relatively little light. A related solution is to add a TIR collimating lens in front of the LED light source. The TIR collimating lens constrains the originally large beam angle to a smaller range. However, after the light emitted by the LED light source passes through the TIR collimating lens, although the beam angle is significantly reduced, a lot of stray light appears.

[0003] Although the improved TIR collimating lens can effectively remove stray light, in order to successfully install the improved TIR collimating lens on the light source, it is necessary to ensure that the size of its bottom opening is larger than the size of the LED light source. Since there is a certain relationship between the size of its bottom opening and its height, the height of the improved TIR collimating lens is too high, which in turn leads to a series of problems such as reduced lens manufacturing efficiency and increased lamp body size. Summary of the Invention

[0004] 1. Technical problem to be solved by the invention

[0005] In order to solve the technical problem that a TIR collimating lens can effectively remove stray light but the height of the lens is too high, the present invention provides a TIR collimating lens, which can not only effectively remove stray light but also reduce the height of the lens.

[0006] 2. Technical solution

[0007] In order to solve the above problems, the technical solution provided by the present invention is:

[0008] A TIR collimating lens, comprising:

[0009] a first surface, the first surface being disposed in the middle of the TIR collimating lens, the first surface being a refractive surface;

[0010] a second surface, the second surface being disposed on one side of the refractive surface;

[0011] a third surface, the third surface being provided on a side of the second surface away from the refractive surface, the third surface being a total reflection surface;

[0012] a fourth surface, the fourth surface being disposed on a side of the third surface away from the second surface;

[0013] a fifth surface, the fifth surface being disposed on a side of the fourth surface away from the third surface;

[0014] a sixth surface, the sixth surface being provided on a side of the fifth surface away from the fourth surface, the sixth surface being a total reflection surface;

[0015] The seventh surface is provided on a side of the sixth surface away from the fifth surface.

[0016] A light source is provided on a side of the TIR collimating lens close to the first surface.

[0017] Optionally, the light source is an LED light source.

[0018] Optionally, the intersection line between the first surface and the second surface is a first line, the second line is a light ray emitted by the light source and intersects with the first line, and the angle between the second line and the vertical direction is α1, and α1≤17.0333°.

[0019] Optionally, the intersection line between the second surface and the third surface is the third line, the fourth line is the light emitted by the light source and intersects with the third line, the angle between the fourth line and the second line is α2, the angle between the fourth line and the horizontal direction is α3, and α2+α3≥72.9667°.

[0020] Optionally, the angle between the fourth surface and the vertical direction is θ1, and θ1 ≥ 2°.

[0021] Optionally, the angle between the fifth surface and the vertical direction is θ2, θ2≥α3-45.6288°.

[0022] Optionally, an angle between the second surface and the horizontal direction is θ3, and θ3≤62.6621°.

[0023] Optionally, the TIR collimating lens is made of PMMA, PC or glass.

[0024] 3. Beneficial effects

[0025] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: it can not only effectively remove stray light, but also reduce the height of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of the outline of a TIR collimating lens proposed in an embodiment of the present invention;

[0027] Figure 2 A half-sectional view of a TIR collimating lens according to an embodiment of the present invention.

[0028] In the figure: 1, first surface; 2, second surface; 3, third surface; 4, fourth surface; 5, fifth surface; 6, sixth surface; 7, seventh surface; 8, light source; 9, TIR collimating lens; 10, first line; 11, second line; 12, third line; 13, fourth line. DETAILED DESCRIPTION

[0029] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0030] The present application will be further described below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended solely to illustrate the relevant inventions and are not intended to limit the inventions. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the drawings. Terms such as "first" and "second" in the present application are provided for the convenience of describing the technical solutions of the present invention and do not have a specific limiting effect. They are general references and do not constitute a limitation on the technical solutions of the present invention. It should be noted that the embodiments and features therein in the present application may be combined with each other unless there is a conflict. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or location relationships, are based on the positions or location relationships shown in the drawings and are intended solely to facilitate description and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances. Specific embodiments

[0032] Combined with attachment Figure 1-2 The present invention provides a TIR collimating lens, the TIR collimating lens 9 comprising:

[0033] The first surface 1 is provided in the middle of the TIR collimating lens 9 and is a refractive surface;

[0034] A second surface 2, the second surface 2 is provided on one side of the refractive surface;

[0035] The third surface 3 is provided on the side of the second surface 2 away from the refractive surface, and the third surface 3 is a total reflection surface;

[0036] The fourth surface 4 is provided on a side of the third surface 3 away from the second surface 2;

[0037] a fifth surface 5 , the fifth surface 5 being provided on a side of the fourth surface 4 away from the third surface 3 ;

[0038] a sixth surface 6, which is provided on a side of the fifth surface 5 away from the fourth surface 4 and is a total reflection surface;

[0039] The seventh surface 7 is provided on a side of the sixth surface 6 away from the fifth surface 5 .

[0040] A light source 8 is provided on a side of the TIR collimating lens close to the first surface 1 .

[0041] Specifically, the light source 8 provides light for the TIR collimating lens 9. The first surface 1 is a refractive surface calculated by the clipping method. The light becomes parallel light after passing through the first surface 1. The light is deflected after passing through the second surface 2 and enters the third surface 3. The third surface 3 is a total reflection surface calculated by the clipping method. The light from the second surface 2 becomes parallel light after passing through the third surface 3. The relevant angles of the fourth surface 4 only need to ensure that the TIR collimating lens 9 is smoothly demolded. The light is deflected after passing through the fifth surface 5 and enters the sixth surface 6. The sixth surface 6 is a total reflection surface calculated by the clipping method. The light from the fifth surface 5 becomes parallel light after passing through the sixth surface 6. Since the light incident on the seventh surface 7 is all vertically incident parallel light, the direction of the light passing through the seventh surface 7 remains unchanged. Among them, the third surface 3 and the sixth surface 6 are both total reflection surfaces. A TIR collimating lens 9 with double reflection surfaces and capable of removing stray light is designed. This can not only effectively remove stray light, but also reduce the height of the TIR collimating lens 9, thereby reducing the cooling time required for the processing and manufacturing of the TIR collimating lens 9, thereby improving production efficiency and reducing the cost of the TIR collimating lens 9.

[0042] Specifically, in order to better cooperate with the TIR collimating lens 9, the light source 8 is an LED light source. Moreover, the LED light source is energy-saving and environmentally friendly.

[0043] Specifically, the intersection line between first surface 1 and second surface 2 is first line 10. Second line 11 is the light emitted by light source 8 and intersects first line 10. The angle between second line 11 and the vertical direction is α1, and α1 ≤ 17.0333°. α1 can be 17.0333°, 17°, or 16°, etc. After passing through first surface 1, the light becomes parallel light and only interacts once, resulting in minimal energy loss. This maximizes the angle of first surface 1, so α1 = 17.0333°.

[0044] Specifically, the intersection line between the second surface 2 and the third surface 3 is the third line 12, the fourth line 13 is the light emitted by the light source 8, and intersects with the third line 12, the angle between the fourth line 13 and the second line 11 is α2, the angle between the fourth line 13 and the horizontal direction is α3, and α2+α3 ≥ 72.9667°. Since there are multiple fourth lines 13, when the fourth line 13 and the second line 11 are located in the same plane, the angle between the fourth line 13 and the second line 11 is α2, and the angle between the fourth line 13 and the horizontal direction is α3. The value of α2+α3 can be 72.9667°, 73°, or 74°, etc. Within the range, a different degree of α3 corresponds to a TIR collimating lens 9. In this embodiment, α3 = 50°. Based on α1+α2+α3 = 90°, α2 = 22.9667° is obtained.

[0045] Specifically, in order to facilitate demoulding and successfully manufacture the TIR collimating lens 9, the angle θ1 between the fourth surface 4 and the vertical direction is greater than or equal to 2°, and can be specifically 2°, 4° or 6°, etc. In this embodiment, θ1=2°.

[0046] Specifically, the angle between the fifth surface 5 and the vertical direction is θ2, where θ2 ≥ α3 - 45.6288°. According to this embodiment, α3 = 50°, resulting in θ2 ≥ 4.3712°. θ2 can be 4.3712°, 5°, or 6°. Each θ2 of different degrees corresponds to a TIR collimating lens 9. In this embodiment, θ2 = 4.3712°.

[0047] Specifically, the angle between the second surface 2 and the horizontal direction is θ3, and θ3 ≤ 62.6621°. θ3 can be 62.6621°, 62°, or 60°, etc. Since the larger θ3 is, the smaller the height of the TIR collimating lens 9 is, in order to minimize the height of the lens, θ3 is set to 62.6621°.

[0048] Specifically, the material of the TIR collimating lens 9 is PMMA, PC or glass, wherein PMMA has better light transmittance; PC has better heat resistance; glass has good light transmittance and good heat resistance, but is expensive.

[0049] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A TIR collimating lens, characterized in that: The TIR collimating lens includes: A first surface, the first surface is provided in the middle of the TIR collimating lens, the first surface is a refractive surface, and light passing through the first surface becomes parallel light; a second surface, the second surface being provided on one side of the refractive surface, wherein light passing through the second surface is deflected and enters the third surface; a third surface, the third surface being provided on a side of the second surface away from the refractive surface, the third surface being a total reflection surface, and light from the second surface being converted into parallel light after passing through the third surface; a fourth surface, the fourth surface being disposed on a side of the third surface away from the second surface; a fifth surface, the fifth surface being disposed on a side of the fourth surface away from the third surface, and light passing through the fifth surface is deflected and enters the sixth surface; a sixth surface, the sixth surface being disposed on a side of the fifth surface away from the fourth surface, the sixth surface being a total reflection surface, and light from the fifth surface being converted into parallel light after passing through the sixth surface; a seventh surface, the seventh surface being disposed on a side of the sixth surface away from the fifth surface, wherein all light incident on the seventh surface is vertically incident parallel light, and the direction of the light passing through the seventh surface remains unchanged; A light source is provided on a side of the TIR collimating lens close to the first surface; The intersection line between the first surface and the second surface is a first line, the second line is a light ray emitted by the light source and intersects with the first line, and the angle between the second line and the vertical direction is α1, and α1≤17.0333°; The angle between the fifth surface and the vertical direction is θ2, θ2≥α3-45.6288°; An angle between the second surface and the horizontal direction is θ3, and θ3≤62.6621°; The intersection line between the second surface and the third surface is the third line, the fourth line is the light emitted by the light source and intersects with the third line, the angle between the fourth line and the second line is α2, the angle between the fourth line and the horizontal direction is α3, and α2+α3≥72.9667°.

2. A TIR collimating lens according to claim 1, characterized in that: The light source is an LED light source.

3. The TIR collimating lens according to claim 1, wherein: The included angle between the fourth surface and the vertical direction is θ1, and θ1 ≥ 2°.

4. The TIR collimating lens according to claim 1, wherein: The material of the TIR collimating lens is PMMA, PC or glass.

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