Light guide element and lamp

Abstract

The light-guiding element and lamp provided by the present application adopt an annular light incident surface. The incident light source is not concentrated in the middle of the column. A reflective surface can be set near the incident surface of the annular structure, so that the large-angle incident light is reflected by the reflective surface and then directed to the top of the column, thereby solving the problem of the original light being concentrated at the bottom. The polarization design of the second optical surface further solves the problem of light concentration at the bottom. After passing through this structure, the light emitted by the LED lamp beads is changed from the original light incident angle to enter the light guide column, which will effectively improve the uniformity of the light guide column, and the light utilization rate will also be improved by adjusting the light incident angle.

Description

Technical Field

[0001] The present invention relates to a light guide element, in particular to a light guide element used for a lamp, and related lamps. Background Art

[0002] Lighting is a major invention that helped humanity conquer the night, transforming it into daylight and expanding the scope and duration of human activities. The development of LEDs has further expanded the design possibilities for lighting fixtures. Light guides, with their diverse shapes, uniform light, and high luminous efficiency, are highly popular among users and are widely used in lighting designs.

[0003] Common light guide fixtures typically feature an LED positioned directly in the middle of the light guide's light entrance surface. Because LEDs are Lambertian light sources with a 120-degree beam angle, light emitted at wide angles experiences high interfacial reflection when entering the light guide's light entrance surface, preventing some light from entering the light guide and resulting in a loss of efficiency. Furthermore, due to the large angle of incidence, a significant amount of light entering the light guide lacks sufficient effective propagation distance and is concentrated at the bottom of the light guide, resulting in extremely uneven illumination along the entire length of the light guide. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of low luminous efficiency and uneven luminous intensity of light guide column type lamps, and proposes a light guide element with a new light input structure.

[0005] In order to achieve the above-mentioned functions, the technical solution adopted by the present invention is to provide a light-guiding element, which is characterized in that the light-guiding element is a solid cylindrical structure, including a first end face, a second end face and a side face connecting the two end faces, the light incident surface is arranged on the first end face, the side face is the light emitting surface, and the light incident surface is an annular surface formed by the first end face being recessed into the interior of the light-guiding element.

[0006] Preferably, a trumpet-shaped structure is also provided on the first end face, which is recessed from the first end face toward the interior of the light-guiding element and whose transverse cross-section gradually decreases. The trumpet-shaped structure is coaxial with the annular surface, and the side surface of the trumpet-shaped structure forms a first reflection surface, and the light incident surface surrounds the first reflection surface.

[0007] Preferably, the first reflective surface is a free-form surface protruding outward from the light-guiding element.

[0008] Preferably, the side surface close to the first end surface is divided into a second reflective surface, and the second reflective surface surrounds the light incident surface.

[0009] Preferably, the second reflective surface is a free-form surface protruding outward from the light guide element.

[0010] Preferably, the light incident surface includes a first optical surface, a second optical surface, and a third optical surface connected in sequence, the second optical surface and the first end surface are arranged opposite to each other, the first optical surface is adjacent to the first reflective surface, one end is connected to the first end surface, and the other end is connected to the second optical surface, the third optical surface is adjacent to the second reflective surface, one end is connected to the second optical surface, and the other end is connected to the first end surface.

[0011] Preferably, on a cross section passing through the axis of the light guide element, the cross section of the second optical surface is a curve, and the cross sections of the first optical surface and the third optical surface are straight lines.

[0012] Preferably, a distance from a connection point between the second optical surface and the first optical surface and the first end surface is smaller than a distance from a connection point between the second optical surface and the third optical surface and the first end surface.

[0013] Preferably, the second optical surface is a free-form surface protruding outward from the light guide element, forming a polarization structure, and light is deflected toward the center of the light guide element after being incident through the second optical surface.

[0014] Preferably, the light emitting surface includes a diffuse reflection structure, and the diffuse reflection structure is a microstructure array or is formed by surface sandblasting.

[0015] Preferably, the diffuse reflection structures are unevenly distributed, and the distribution density of the diffuse reflection structures is proportional to the distance from the location of the diffuse reflection structures to the first end surface, that is, the farther away from the first end surface, the greater the distribution density of the diffuse reflection structures.

[0016] Preferably, the microstructure is in the shape of a pyramid, a hexagon, a spherical arch, a pyramid, a linear groove or a surface dot structure.

[0017] The present application also provides a lamp, characterized in that: the lamp includes a light source and the light guide element as described above, and the light source is arranged in a ring and is covered by the light incident surface of the light guide element.

[0018] In the light-guiding element provided by the present invention, the incident light source is not concentrated in the middle of the column. A reflective surface can be provided adjacent to the incident surface of the annular structure, so that the large-angle incident light is reflected by the reflective surface and directed upwards to the column, thereby resolving the problem of light concentration at the bottom. The polarization design of the second optical surface further resolves the problem of light concentration at the bottom. After passing through this structure, the light emitted by the LED lamp is redirected from its original incident angle into the light guide column, effectively improving the uniformity of the light guide column and increasing light utilization by adjusting the incident angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic cross-sectional view of a lamp according to a preferred embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A partial view of a light guide element in a preferred embodiment;

[0021] Figure 3 It is a structural schematic diagram of another preferred embodiment of the light guide element of the present invention. DETAILED DESCRIPTION

[0022] The light guide element for a lamp proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] A lamp in a preferred embodiment of the present application is as follows Figure 1 The lamp comprises a base 6, a lampshade 2, a light guide element 1, and a light source 3. The light source 3 is arranged in a circular pattern on the base 6. The light guide element 1 includes an annular light incident surface 101 covering the light source 3. The lampshade 2 is disposed outside the light guide element 1. Light emitted by the light source 3 enters the light guide element 1 through the light incident surface 101, then exits through the light emitting surface 102 and evenly strikes the lampshade 2. The entire lampshade emits light evenly, achieving a good lighting effect.

[0024] The light guide element 1 is a solid cylindrical structure with a first end face 11, a second end face 12 and a side face 13 connecting the two end faces. The light incident surface 101 is provided on the first end face 11 and is an annular surface formed by the first end face 11 being recessed into the interior of the light guide element 1. The side face 13 of the light guide element 1 is the light exit surface 102. For the specific structure and light path, please refer to Figure 2 A partial enlarged view. The light incident surface 101 includes a first optical surface 1011, a second optical surface 1012, and a third optical surface 1013, which are connected in sequence. The second optical surface 1012 is disposed opposite the first end surface 11. The first optical surface 1011 and the third optical surface 1013 are both connected to the first end surface 11 at one end and to the second optical surface 1012 at the other end. The first optical surface 1011 is located closer to the inner side of the light guide element, while the third optical surface 1013 is located on the side adjacent to the light exit surface 102. Figure 2 is a cross-sectional view of the light guide element 1 through the axis, as shown Figure 2 As shown, on the cross section passing through the axis of the light guide element, the cross section of the second optical surface 1012 is a curve, which is a free curve protruding outward from the light guide element 1, and the side close to the center is lower than the side close to the side 13, that is, the distance from the connection point with the first optical surface 1011 to the first end surface 11 is shorter than the distance from the connection point with the third optical surface 1013 to the first end surface 11. Thus, a polarization structure is formed, as shown in FIG. Figure 2 The light 1 in the light guide element deflects toward the center of the light guide element after being incident on the second optical surface 1012. The first optical surface 1011 and the third optical surface 1013 are Figure 2The cross section in is a straight line. If the incident light is not processed, most of it will be emitted directly from the bottom of the light-guiding element 1, which will result in a phenomenon where the bottom is brighter and the top is darker. Therefore, we set two reflective surfaces at positions adjacent to these two optical surfaces. A first reflective surface 103 is provided adjacent to the first optical surface 1011. The first reflective surface 103 is a free-form surface protruding outward from the light-guiding element 1. Since the light-entering surface 101 is annular, the first reflective surface 103 is provided on the inner side of the first optical surface 1011, surrounding it to form a trumpet-shaped structure in which the first end face 11 is recessed into the interior of the light-guiding element 1 and the transverse cross-section gradually decreases. The side of the trumpet-shaped structure forms the first reflective surface 103. The trumpet-shaped structure is coaxial with the annular surface formed by the light-entering surface 101. A second reflective surface 104 is provided on the side of the light-guiding element 1 near the end face. The second reflective surface 104 surrounds the light-entering surface 101 adjacent to the third optical surface 1013. The second reflective surface 104 is a free-form surface protruding outward from the light-guiding element 1.

[0025] exist Figure 2 The light emitted by light source 3 is divided into three parts and enters light guide element 1. The first part of the light is marked as light 1 in the figure. It is incident on the second optical surface 1012, polarized and hits the upper part of light guide element 1, and exits through light exit surface 102. The second part of the light is marked as light 2 in the figure. After being refracted by the third optical surface 1013 and reflected by the second reflective surface 104, the light is emitted above the light guide element 1 and exits through light exit surface 102. The third part of the light is marked as light 3 in the figure. After being refracted by the first optical surface 1011 and reflected by the first reflective surface 103, the light is emitted above the light guide element 1 and exits through light exit surface 102.

[0026] In order to make the light output from the surface of the light-guiding element 1 more uniform, a diffuse reflection structure is further provided on the light-emitting surface 102. In this embodiment, the diffuse reflection structure is formed by surface sandblasting. This application mainly solves the problem of uneven light output from the light-guiding column, so we have also proposed improvements on the diffuse reflection structure. The diffuse reflection structure on the light-emitting surface 102 is unevenly distributed, and its distribution density is proportional to the distance from its position to the first end face 11 where the light incident surface is located, that is, the farther away from the light incident surface, the greater the distribution density of the diffuse reflection structure. In this embodiment, the light-emitting surface 102 is a non-uniform sandblasted surface from top to bottom and from heavy to light, that is, heavy sandblasting is performed near the upper end, and light sandblasting is performed near the lower end. Heavy sandblasting means that the volume of sand is large and / or the sandblasting density is also large.

[0027] Figure 3The light-guiding element of another preferred embodiment of the present application is shown. The basic structure of the light-guiding element is similar to that of the aforementioned embodiment, and will not be described in detail here. The difference lies in the light-emitting surface 102. In the previous embodiment, the light-emitting surface 102 is a smooth surface, while in this embodiment, a microstructure 1022 serving as a diffuse reflection structure is provided on the light-emitting surface 102. The microstructure 1022 is a linear groove surrounding the circumference of the cylindrical body of the light-guiding element 1, which is also dense on the top and sparse on the bottom. Its optical effect is to destroy the total reflection surface, and the upper surface is denser, so that the light that should have been totally reflected back into the light-guiding column is emitted through the microstructure. Thereby, the light output on the surface of the light-guiding element 1 is uniform. In addition to linear grooves, the microstructure 1022 can also be a microstructure in the shape of a pyramid, hexagon, spherical arch, pyramid, or a surface dotted structure.

[0028] Figure 1 This is merely one specific example of an application of the light guide element 1 of the present application. In other preferred embodiments, the lamp can have various other shapes, and the base 6 and lampshade 2 can have various shapes, and their connection method can be flexibly configured according to the different shapes. Furthermore, the light guide element 1 can also be used in a chandelier, which can include multiple lamp heads connected to each other by lamp arms, each lamp head being provided with a light guide element 1, and the lamp heads may or may not be provided with a lampshade. This application does not limit this.

[0029] The foregoing description of the preferred embodiments of the invention is for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the specific forms disclosed. Obviously, many modifications and variations may be made which may be obvious to those skilled in the art and should be included within the scope of the invention as defined by the appended claims.

Claims

1. A light guide element, characterized in that: The light guide element is a solid cylindrical structure, including a first end face, a second end face and a side face connecting the two end faces. The light incident surface is provided on the first end face, the side face is a light emitting surface, and the light incident surface is an annular surface formed by the first end face being recessed toward the interior of the light guide element. A trumpet-shaped structure is further provided on the first end surface, which is recessed from the first end surface toward the interior of the light guide element and has a gradually reduced transverse cross-section. The trumpet-shaped structure is coaxial with the annular surface. The side surface of the trumpet-shaped structure forms a first reflecting surface. The light incident surface surrounds the first reflecting surface. The side surface close to the first end portion is divided into a second reflecting surface, and the second reflecting surface surrounds the light incident surface. The light incident surface includes a first optical surface, a second optical surface, and a third optical surface connected in sequence, the second optical surface and the first end surface are arranged opposite to each other, the first optical surface is adjacent to the first reflective surface, one end of the first optical surface is connected to the first end surface, and the other end is connected to the second optical surface, the third optical surface is adjacent to the second reflective surface, one end of the second optical surface is connected to the first end surface, and the other end is connected to the first end surface. The distance from the connection point of the second optical surface and the first optical surface to the first end surface is smaller than the distance from the connection point of the second optical surface and the third optical surface to the first end surface. The second optical surface is a free-form surface protruding outward from the light guide element, forming a polarization structure. After the light is incident through the second optical surface, it is deflected toward the center of the light guide element and then emitted from the light output surface.

2. The light guide element according to claim 1, wherein: The first reflecting surface is a free-curved surface protruding outward from the light guide element.

3. The light guide element according to claim 1, wherein: The second reflective surface is a free-curved surface protruding outward from the light guide element.

4. The light guide element according to claim 1, wherein: On a cross section passing through the axis of the light guide element, the cross section of the second optical surface is a curve, and the cross sections of the first optical surface and the third optical surface are straight lines.

5. The light guide element according to any one of claims 1 to 4, characterized in that: The light emitting surface includes a diffuse reflection structure, which is a microstructure array or formed by surface sandblasting.

6. The light guide element according to claim 5, wherein: The diffuse reflection structures are unevenly distributed, and the distribution density of the diffuse reflection structures is proportional to the distance from the location of the diffuse reflection structures to the first end surface, that is, the farther away from the first end surface, the greater the distribution density of the diffuse reflection structures.

7. The light guide element according to claim 5, wherein: The microstructure is in the shape of a pyramid, a hexagon, a spherical arch, a pyramid, a linear groove or a surface dot structure.

8. A lamp, characterized in that: The lamp includes a light source and the light guide element according to any one of claims 1 to 7, and the light source is arranged in a ring and is covered by the light incident surface of the light guide element.

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