Optical device for modifying a light distribution and method of manufacturing the same
By designing the vertical relationship of the light incident surfaces of the first and second lens sections in the optical device, the problem of manufacturing complexity and insufficient effect caused by the thickness of the lens section in the prior art is solved, and the modification of the light distribution of the light source is achieved and Manufacturing simplified.
Patent Information
- Application Number
- CN202380041763.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-06-07
- Filing Date
- 2023-06-01
- Publication Date
- 2024-12-31
AI Technical Summary
When the existing optical devices realize the collimation effect of light distribution of light sources, the lens section needs to be thicker, resulting in complex manufacturing and difficult to meet sufficient thinness and effect.
An optical device is designed, including a central portion and a reflector portion surrounding the central portion, and by providing light incident surfaces of the first and second lens sections, ensuring that the geometric lines of the first light incident surface at the center of mass point are perpendicular to the second light The incident surface achieves the collimation effect of light while maintaining the thinness of the lens section.
The modification of the light distribution of the light source is achieved, the manufacturing process is simplified, and the thinness of the lens section is ensured while achieving the desired collimation effect.
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Figure CN119234109A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates generally to lighting engineering. More specifically, the present disclosure relates to an optical device for changing the distribution of light generated by a light source, which light source may include one or more light emitting diodes (LEDs), for example but not necessarily. In addition, the present disclosure relates to a lighting fixture, which includes a light source and an optical device configured to modify the distribution of light generated by the light source. In addition, the present disclosure relates to a method for manufacturing the optical device. Background Art
[0002] In certain applications, the distribution of light produced by a light source may be important, or even critical. For example, but not necessarily, the light source may include one or more light emitting diodes "LEDs", one or more incandescent lamps, or one or more gas discharge lamps. The distribution of light produced by a light source may be altered using optical devices, such as lenses, reflectors, and combined lens-reflector devices that include a portion that functions as a lens and a portion that functions as a reflector. Figure 1 A cross-sectional view of an exemplary lighting fixture according to the prior art is shown, the lighting fixture comprising a light source 102 and an optical device 101. The optical device 101 is configured to modify the distribution of light emitted by the light source 102. Figure 1 An example light beam is depicted with a dashed arrow in FIG. Optical device 101 may be rotationally symmetric about the z-axis of coordinate system 199, for example. In this exemplary case, light source 102 is a light emitting diode "LED" comprising a semiconductor portion 130 that emits blue light and a yellow phosphor 131 that converts the blue light into white light having multiple wavelengths.
[0003] The optical device 101 is made of a transparent material and includes a central portion 103 and a reflector portion 104 surrounding the central portion 103. The reflector portion 104 includes a reflector surface 105 configured to provide total internal reflection "TIR". The central portion 103 includes a lens segment 106 configured to collimate light passing through the lens segment 106. An inconvenience associated with the optical device 101 is that the collimating lens segment 106 needs to be quite thick to achieve a sufficient collimation effect, but on the other hand, the thick lens segment 106 complicates the manufacture of the optical device 101. Summary of the invention
[0004] A simplified overview is presented below to provide a basic understanding of some aspects of various invention embodiments. This overview is not an extensive overview of the present invention. It is neither intended to identify the key or decisive elements of the present invention nor to delineate the scope of the present invention. The following overview merely presents some concepts of the present invention in a simplified form as a prelude to a more detailed description of exemplary embodiments of the present invention.
[0005] In this document, the word "geometry", when used as a prefix, means a geometric concept that is not necessarily part of any physical object. A geometric concept can be, for example, a geometric point, a geometric line, a geometric curve, a geometric plane, a non-planar geometric surface, a geometric space, or any other geometric entity of zero, one, two, or three dimensions.
[0006] According to the present invention, a new optical device is provided for modifying the distribution of light generated by a light source.
[0007] An optical device according to the invention comprises a central part and a reflector part surrounding the central part, the reflector part comprising a reflector surface configured to provide total internal reflection "TIR". The central part comprises a first lens segment and a second lens segment continuous with the first lens segment, the first lens segment comprising a first light incident surface and a first light exit surface, and the second lens segment comprising a second light incident surface and a second light exit surface, such that the second light incident surface faces the first light exit surface. The sizes of the first and second light incident surfaces are set so that the projection of the first light incident surface on a geometric plane perpendicular to a geometric line passing through a centroid of the first lens segment and a centroid of the second lens segment is smaller than the projection of the second light incident surface on the geometric plane. These projections are considered instead of the first and second light incident surfaces because the partitions of these projections are independent of possible unevenness of the first and / or second light incident surfaces and therefore these projections better describe the extent of the partitions through which the first and second lens segments receive light.
[0008] Due to the presence of the first and second continuous lens segments described above, and the size of the light incident surfaces of these lens segments being designed in the above manner, the desired collimation effect can be achieved even if the lens segments are sufficiently thin from a manufacturing point of view. According to an exemplary and non-limiting embodiment, it is also possible that there are more than two continuous lens segments in the central part of the optical device.
[0009] According to the present invention, a novel lighting fixture is also provided, comprising: - a light source, and An optical device according to the invention, configured to modify the distribution of light emitted by a light source.
[0010] The light source is positioned symmetrically about a geometric line passing through a centroid point of the first lens section and a centroid point of the second lens section of the optical device.The light source may include, for example, one or more light emitting diodes "LEDs".
[0011] According to the present invention, a novel method for manufacturing an optical device according to the present invention is also provided. The method comprises: - manufacturing a first transparent part, which constitutes the reflector part and the first lens segment of the optical device, - manufacturing a second transparent part, which constitutes the second lens segment of the optical device, and - attaching the second transparent piece to the first transparent piece such that the second lens segment is continuous with the first lens segment and the second light incident surface of the second lens segment faces the first light exit surface of the first lens segment.
[0012] The first transparent part and the second transparent part can be made by mold casting, for example. The second transparent part can be attached to the first transparent part using, for example, ultrasonic welding, glue, mechanical shape locking, screw thread, friction fit and / or some other suitable fastening methods. The first transparent part can be made of, for example, acrylic plastic, polycarbonate, optical silicone or glass. Correspondingly, the second transparent part can be made of, for example, acrylic plastic, polycarbonate, optical silicone or glass. The first transparent part and the second transparent part can be made of the same transparent material, or they can also be made of different transparent materials.
[0013] Various exemplifying and non-limiting embodiments are described in the accompanying dependent claims.
[0014] Illustrative and non-limiting embodiments, both as to constructions and methods of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific exemplary embodiments when read in connection with the accompanying drawings.
[0015] In this document, the verbs "to comprise" and "to include" are used as open limitations that neither exclude nor require the existence of unrecited features.
[0016] Unless explicitly stated otherwise, the features recited in the dependent claims may be freely combined with each other.
[0017] In addition, it will be understood that the use of "a" or "an" in this document, even in the singular, does not exclude a plurality. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Exemplary and non-limiting embodiments and their advantages will be explained in more detail below with reference to the accompanying drawings, in which:
[0019] Figure 1 A lighting fixture is shown, comprising a light source and an optical device according to the prior art for modifying the light distribution,
[0020] Figure 2 A lighting fixture is shown, comprising a light source and an optical device for modifying light distribution according to an exemplary and non-limiting embodiment, and
[0021] Figure 3 A flow chart of a method according to an exemplary and non-limiting embodiment for manufacturing an optical device is shown.
[0022] In the background technology section of this document, Figure 1 Explanation was given. DETAILED DESCRIPTION
[0023] The specific examples provided in the description given below should not be construed as limiting the scope and / or applicability of the appended claims.The lists and groups of examples provided in the description given below are not exhaustive unless explicitly stated otherwise.
[0024] Figure 2 An optical device 201 is shown according to an exemplary and non-limiting embodiment. The optical device 201 is configured to modify the distribution of light emitted by a light source 202. The light source 202 may be, for example, a light emitting diode "LED" that includes a semiconductor portion that emits blue light and a yellow phosphor that converts the blue light into white light having multiple wavelengths. Figure 2 , an example beam is depicted by a dashed arrow.
[0025] exist Figure 2 , the optical device 201 is shown as a cross-section view such that the geometrical section plane is parallel to the geometrical xz plane of the coordinate system 299. The optical device 201 may, for example, be rotationally symmetric about the z-axis of the coordinate system 299. As another example, an optical device according to an embodiment of the present invention may be an elongated element such that Figure 2 The cross section of the type shown is a cross section of the optical device, and the cross section is the same in the longitudinal length perpendicular to the geometric section plane. The optical device 201 includes a central portion 203 and a reflector portion 204 surrounding the central portion 203. The reflector portion 204 includes a reflector surface 205, which is configured to provide total internal reflection "TIR". The central portion 203 includes a first lens segment 206 and a second lens segment 207 continuous with the first lens segment 207. The first lens segment 206 has a first light incident surface 208 and a first light exit surface 209. The second lens segment 207 includes a second light incident surface 210 and a second light exit surface 211, so that the second light incident surface 210 faces the first light exit surface 209. The sizes of the first light incident surface 208 and the second light incident surface 210 are set so that the projection of the first light incident surface 208 on the geometric xy plane of the coordinate system 299 is smaller than the projection of the second light incident surface 210 on the geometric xy plane of the coordinate system 299. The above-mentioned projection of the second light incident surface 210 may be, for example, at least 10% larger than the above-mentioned projection of the first light incident surface 208.
[0026] In the exemplary optical device 201, the projection of the first light exit surface 209 on the geometric xy plane of the coordinate system 299 is larger than the projection of the first light incident surface 208 on the geometric xy plane, and the cavity between the first lens segment 206 and the second lens segment 207 has an expansion shape, so that the projection of the second light incident surface 210 on the geometric xy plane of the coordinate system 299 is larger than the projection of the first light exit surface 209 on the geometric xy plane of the coordinate system 299.
[0027] In the exemplary optical device 201, the first light incident surface 208 is planar, the first light exit surface 209 is convex, the second light incident surface 210 is convex, and the second light exit surface 211 is planar. It is also possible that in the optical device according to an exemplary and non-limiting embodiment, one or more of the light incident surface and / or the light exit surface of the first and second lens segments is a Fresnel lens surface.
[0028] In the exemplary optical device 201, the reflector portion 204 and the first lens segment 206 constitute a first transparent member made of a first transparent material, and the second lens segment 207 constitutes a second transparent member made of a second transparent material. The first transparent material can be, for example, acrylic plastic, polycarbonate, optical silicone, or glass. Correspondingly, the second transparent material can be, for example, acrylic plastic, polycarbonate, optical silicone, or glass. The first transparent member and the second transparent member can be made of the same transparent material, or the first transparent member and the second transparent member can be made of different transparent materials.
[0029] The optical device 201 and the light source 202 constitute a lighting fixture according to an exemplary and non-limiting embodiment. The light source 202 is mechanically supported relative to the optical device 201 so that the light source 202 is symmetrically positioned about a geometric z-axis of the coordinate system 299 .
[0030] Figure 3 A flow chart showing a method for manufacturing an optical device according to an exemplary and non-limiting embodiment, the optical device may be, for example, a Figure 2 The optical device 201 shown in FIG. The method comprises the following actions: - Action 301: manufacturing a first transparent piece, the first transparent piece constituting the reflector portion and the first lens segment of the optical device, - Action 302: manufacturing a second transparent member, the second transparent member constituting the second lens segment of the optical device, and - Action 303: Attaching the second transparent piece to the first transparent piece such that the second lens segment is continuous with the first lens segment and the second light incident surface of the second lens segment faces the first light exit surface of the first lens segment.
[0031] In a method according to an exemplary and non-limiting embodiment, the first transparent member is manufactured by mold casting, and the second transparent member is manufactured by mold casting.
[0032] In a method according to an exemplary and non-limiting embodiment: - the first transparent member is made of one of the following materials: acrylic plastic, polycarbonate, optical silicone, glass, and - The second transparent piece is made of one of the following materials: acrylic plastic, polycarbonate, optical silicone, glass.
[0033] In a method according to an exemplary and non-limiting embodiment: the second transparent piece is attached to the first transparent piece using at least one of the following means: ultrasonic welding, glue, mechanical form locking, threads, and / or friction fit.
[0034] The specific examples provided in the description given above should not be construed as limiting the scope and / or applicability of the appended claims.The lists and groups of examples provided in the description given above are not exhaustive unless expressly stated otherwise.
Claims
1. An optical device (201) for changing light distribution, the optical device comprising a central part (203) and a reflector part (204) surrounding the central part (202), the reflector part (204) comprising a reflector surface (205) configured to provide total internal reflection, the central part comprising a first lens segment (206), the first lens segment (206) comprising a first light incident surface (208) and a first light exit surface (209), characterized in that: The central portion includes a second lens segment (207) continuous with the first lens segment, the second lens segment (207) including a second light incident surface (210) and a second light exit surface (211), the second light incident surface facing the first light exit surface, wherein a projection of the first light incident surface on a geometric plane (xy) perpendicular to a geometric line (z) passing through a centroid point of the first lens segment and a centroid point of the second lens segment is smaller than a projection of the second light incident surface on the geometric plane.
2. The optical device according to claim 1, wherein a projection of the first light exit surface (209) on the geometric plane is larger than a projection of the first light incident surface (208) on the geometric plane.
3. The optical device according to claim 1 or 2, wherein a projection of the second light incident surface (210) on the geometric plane is larger than a projection of the first light exit surface (209) on the geometric plane.
4. The optical device according to any one of claims 1 to 3, wherein the first light incident surface (208) is planar and the first light exit surface (209) is convex.
5. The optical device according to any one of claims 1 to 4, wherein the second light incident surface (210) is convex and the second light exit surface (211) is planar.
6. An optical device according to any one of claims 1 to 5, wherein the reflector portion (204) and the first lens segment (206) constitute a first transparent piece made of a first transparent material, and the second lens segment (207) constitutes a second transparent piece made of a second transparent material, the second transparent piece being attached to the first transparent piece.
7. The optical device according to claim 6, wherein the second light incident surface (210) is separated from the first light exit surface (209) by a distance.
8. An optical device according to claim 6 or 7, wherein the first transparent material is one of the following materials: acrylic plastic, polycarbonate, optical silicone, glass.
9. The optical device according to any one of claims 6 to 8, wherein the second transparent material is one of the following materials: acrylic plastic, polycarbonate, optical silicone, glass.
10. The optical device according to any one of claims 1 to 9, wherein the optical device is rotationally symmetric with respect to the geometrical line (z) passing through the center of mass of the first lens segment and the center of mass of the second lens segment.
11. The optical device according to any one of claims 1 to 10, wherein a projection of the second light incident surface on the geometric plane is at least 10% larger than a projection of the first light incident surface on the geometric plane.
12. A lighting fixture, comprising: - a light source (202), and - an optical device (201) according to any one of claims 1 to 11, configured to modify the distribution of light emitted by the light source, Wherein the light sources are positioned symmetrically about the geometric line.
13. A method for manufacturing an optical device according to any one of claims 1 to 11, the method comprising: - manufacturing (301) a first transparent part, which constitutes the reflector part and the first lens segment of the optical device, - manufacturing (302) a second transparent part, which constitutes the second lens segment of the optical device, and - attaching (303) the second transparent piece to the first transparent piece such that the second lens segment is continuous with the first lens segment and the second light incident surface of the second lens segment faces the first light exit surface of the first lens segment. 14 . The method according to claim 13 , wherein the first transparent member is made by mold casting, and the second transparent member is made by mold casting.
15. The method according to claim 13 or 14, wherein: - the first transparent piece is made of one of the following materials: acrylic plastic, polycarbonate, optical silicone, glass, and - The second transparent piece is made of one of the following materials: acrylic plastic, polycarbonate, optical silicone, glass.
16. The method according to any one of claims 13 to 15, wherein the second transparent piece is attached to the first transparent piece using at least one of the following means: ultrasonic welding, glue, mechanical form locking, screw threads, friction fit.