Optical system and luminaire

Abstract

The application provides an optical system and a lamp, which comprises an optical assembly and a light source assembly, the optical assembly has an incident light side and an outgoing light side arranged oppositely, and the light source assembly is arranged towards the incident light side, the optical assembly comprises a first optical part and a second optical part, the second optical part is arranged outside the first optical part, the inner side wall of the first optical part is a first total reflection surface, the inner side wall of the side of the second optical part away from the first optical part is a second total reflection surface, and the light emitted by the light source assembly is refracted at the incident light side, reflected by the first total reflection surface and the second total reflection surface respectively, and refracted at the outgoing light side to be emitted. By arranging two groups of lenses and filling silica gel between the lenses and the light source assembly, the interface reflection of the incident surface can be eliminated, the transmittance of the emitted light is effectively improved, and different light distribution angles can be realized by controlling the curvature of the total reflection surface.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical system and a lamp, belonging to the technical field of illumination. BACKGROUND

[0002] The existing spotlight generally controls the curvature of the incident surface, total reflection surface and exit surface to emit as much energy as possible, but the incident light will produce interface reflection (Fresnel reflection) at the incident surface, consuming most of the energy of the light, making it difficult to further improve the effective utilization rate of light.

[0003] Therefore, it is necessary to improve the existing optical system and lamp to solve the above problems. SUMMARY

[0004] The purpose of the present application is to provide an optical system and a lamp to improve the transmittance of light.

[0005] To achieve the above purpose, the present application provides an optical system, comprising an optical assembly and a light source assembly, the optical assembly has an incident side and an exit side arranged oppositely, and the light source assembly is arranged towards the incident side, the optical assembly comprises a first optical part and a second optical part, the second optical part is arranged outside the first optical part, the inner side wall of the first optical part is a first total reflection surface, the inner side wall of the side of the second optical part away from the first optical part is a second total reflection surface, the light emitted by the light source assembly is refracted at the incident side, then reflected by the first total reflection surface and the second total reflection surface respectively, and then refracted at the exit side to exit.

[0006] As a further improvement of the present application, the first optical part and the second optical part are both trumpet-shaped, the second optical part is arranged around the outside of the first optical part, and the first optical part and the second optical part are centrally symmetric relative to the same axis.

[0007] As a further improvement of the present application, the first optical part and the second optical part are both strip-shaped, and the second optical part comprises two parts arranged on both sides of the first optical part.

[0008] As a further improvement of the present application, a third optical part is further arranged between the optical assembly and the light source assembly, and the light emitted by the light source assembly enters the first optical part and the second optical part after passing through the third optical part.

[0009] As a further improvement of the present application, the refractive index of the third optical part is the same as that of the second optical part.

[0010] As a further improvement of the present application, the first total reflection surface and the second total reflection surface are both free-form surfaces.

[0011] As a further improvement of the present application, the first optical part has a first incident surface on the light-incoming side, the second optical part has a second incident surface on the light-incoming side, the first optical part has a first exit surface on the light-outgoing side, the second optical part has a second exit surface on the light-outgoing side, the first incident surface and the second incident surface are staggered, and the first exit surface and the second exit surface are located on the same plane.

[0012] As a further improvement of the present application, the first exit surface has a limiting part extending towards the second exit surface, a groove is provided on the second exit surface for accommodating the limiting part, and the limiting part is fixed relative to the second optical part by cooperating with the groove.

[0013] To achieve the above object, the present application further provides a lamp comprising the optical system as described above.

[0014] The present application has the advantages that the present application can eliminate the interface reflection of the incident surface by arranging two groups of lenses and filling silica gel between the lenses and the light source assembly, effectively improving the transmittance of the outgoing light, and different light distribution angles can be realized by controlling the curvature of the total reflection surface. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of the optical path structure of the lamp of the present application.

[0016] Figure 2 is a schematic diagram of the cross-sectional structure of the lamp of the present application.

[0017] Figure 3 is a schematic diagram of the cross-sectional structure of the lamp of the present application. DETAILED DESCRIPTION

[0018] In order to make the object, technical solutions and advantages of the present application clearer, the present application will be described in detail below with reference to the drawings and specific embodiments.

[0019] Here, it should be noted that, in order to avoid the unnecessary details from obscuring the present application, only the structures and / or processing steps closely related to the solutions of the present application are shown in the drawings, and other details not closely related to the present application are omitted.

[0020] In addition, it should be noted that the terms "comprise", "contain" or any other variant are intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0021] As shown in Figures 1 to 3 The present application discloses a lamp 100, which is provided with an optical system for improving light transmittance, the optical system comprising an optical assembly 10, the optical assembly 10 being a lens structure and covering a light source 21 of the lamp 100, the light source 21 can be an LED lamp bead, the optical assembly 10 is used for controlling the light emitted by the lamp 100 to improve the transmittance. In order to describe clearly, the following part of the specification will take the optical assembly 10 applied to the lamp 100 as an example to describe the specific structure of the lamp 100 in detail.

[0022] As shown in Figure 2 The optical system comprises an optical assembly 10 and a light source assembly 20, the optical assembly 10 is trumpet-shaped and has oppositely arranged light-in side and light-out side, wherein the smaller cross-section side of the optical assembly 10 is the light-in side and the larger cross-section side is the light-out side. The light source assembly 20 is arranged towards the light-in side, the light source assembly 20 comprises a light source 21 and a substrate 22, the light source 21 is arranged on the substrate 22 and is arranged towards the optical assembly 10, so that the light emitted by the light source 21 passes through the light-in side and is emitted from the light-out side.

[0023] As a preferred embodiment of the present application, the optical assembly 10 comprises a first optical part 11 and a second optical part 12, the first optical part 11 and the second optical part 12 are centrally symmetrical relative to the same axis. The second optical part 12 forms a cavity for accommodating the first optical part 11, the first optical part 11 is trumpet-shaped and the inner side wall of the first optical part 11 forms a first total reflection surface 112, the second optical part 12 is trumpet-shaped and is arranged around the outside of the first optical part 11, and the inner side wall of the second optical part 12 forms a second total reflection surface 122. Preferably, the inner side wall of the first optical part 11 is the first total reflection surface 112 as a whole, and the inner side wall of the side of the second optical part 12 away from the first optical part 11 is the second total reflection surface 122 as a whole. It can be understood that the cavity is also trumpet-shaped to fit the outer side wall of the first optical part 11, and the first total reflection surface 112 is arranged between the first optical part 11 and the second optical part 12.

[0024] As shown in Figure 2 In another optional embodiment of the present application, the first optical part 11 and the second optical part 12 are both strip-shaped and extend in the same direction, that is, the first optical part 11 and the second optical part 12 both extend along the direction of the light-in side of the optical assembly 10. Figure 2The normal direction of the sectional view of the middle lamp 100 extends, the second optical part 12 includes two parts arranged on both sides of the first optical part 11, and the second optical part 12 is symmetric about the first optical part 11, which can be set as required and is not limited here.

[0025] The first optical part 11 has a first incident surface 111 on the light-in side, the first optical part 11 has a first exit surface 113 on the light-out side, the second optical part 12 has a second incident surface 121 on the light-in side, and the second optical part 12 has a second exit surface 123 on the light-out side.

[0026] In this way, the light emitted by the light source assembly 20 can pass through the first optical part 11 and the second optical part 12 respectively, and can be divided into a first path and a second path, wherein the first path is to sequentially refract through the first incident surface 111, reflect through the first total reflection surface 112, and refract through the first exit surface 113, and the second path is to sequentially refract through the second incident surface 121, reflect through the second total reflection surface 122, and refract through the second exit surface 123. That is, the light emitted by the light source assembly 20 is emitted from the light-out side after passing through the first path and the second path from the light-in side. In another embodiment of the present application, the first exit surface 113 and the second exit surface 123 are located in the same plane, and the first incident surface 111 and the second incident surface 121 are arranged staggered.

[0027] As a preferred embodiment of the present application, a third optical part 13 is further provided between the optical assembly 10 and the light source assembly 20, and the first optical part 11, the second optical part 12, and the third optical part 13 are centrally symmetric with respect to the same axis. The light emitted by the light source assembly 20 enters the first optical part 11 and the second optical part 12 after passing through the third optical part 13.

[0028] Specifically, the third optical element 13 is disposed between the light source 21 and the incident light side to fill the gap between the light source 21 and the first optical element 11 and the second optical element 12, thereby reducing Fresnel reflection and increasing light transmittance. Preferably, the refractive index of the third optical element 13 is the same as that of the second optical element 12. It is understood that the refractive index of the third optical element 13 being the same as that of the second optical element 12 is not strictly limited, as long as the refractive indices are the same or similar. The materials of the third optical element 13 and the second optical element 12 can be the same, thus making their refractive indices the same. Of course, the materials of the third optical element 13 and the second optical element 12 can also be different, and can be set as needed without any restrictions.

[0029] In the above embodiments, the first optical part 11 and the second optical part 12 can be made of glass, including but not limited to PMMA, PC, or resin materials. The first optical part 11 and the second optical part 12 are essentially lenses, and the third optical part 13 can be made of silicone. When the first optical part 11 and the second optical part 12 are made of acrylic, because the refractive index of silicone is 1.41 and close to the refractive index of acrylic (1.489), the interface reflection (Fresnel reflection) between the first incident surface 111 and the second incident surface 121 can be eliminated. Of course, in other embodiments of the present invention, the third optical part 13 can also be made of other materials, as long as the refractive index is close to that of the first optical part 11 and the second optical part 12, and no limitation is made here.

[0030] In another preferred embodiment of the present invention, both the first total reflection surface 112 and the second total reflection surface 122 are freeform surfaces. By controlling the curvature of the first total reflection surface 112 and the second total reflection surface 122, the angle of the emitted light can be adjusted, thereby achieving a significant increase in transmittance, approaching 100%.

[0031] like Figure 1 As shown, specifically, the normal vector at any point on the first total reflection surface 112 satisfy in, The incident light ray at that point before being reflected by the first total internal reflection surface 112. Let n be the emitted ray at that point, and n1 be the refractive index of the first optical unit 11. Similarly, the normal vector at any point on the second total reflection surface 122... satisfy in, The incident light ray at that point before being reflected by the second total internal reflection surface 122. For the outgoing light ray at this point, n2 is the refractive index of the second optical part 12.

[0032] In the vector form of the incident light ray For example, The vector form of the incident light ray can be expressed as (cosθ, sinθ), where θ is the angle between the incident light ray and the x-axis. According to different requirements of the user for the light distribution angle of the lamp 100, different light distribution angles such as 10°, 24°, 30°, 60°, etc. can be set, and the direction vector of the outgoing light ray changes accordingly. When the direction vector of the outgoing light ray is known, the normal vector of the first total reflection surface 112 or the second total reflection surface 122 on the specified incident light ray can be obtained. By specifying the coordinates of the initial point, using Euler's mathematical approach, the coordinates of each point of the first total reflection surface 112 and the second total reflection surface 122 are obtained by solving the above formulas respectively, and the free curve command is used to connect the coordinate points to obtain the data of the free surface of the first total reflection surface 112 and the second total reflection surface 122.

[0033] As shown in Figure 3 As another embodiment of the present application, the first exit surface 113 has a limiting part 114 extending towards the second exit surface 123, and the second exit surface 123 has a corresponding groove for accommodating the limiting part 114. The limiting part 114 is fixed relative to the second optical part 12 by cooperating with the groove. Further, the lamp 100 further comprises a housing (not shown) for fixing the optical assembly 10 and the light source assembly 20 and preventing them from being separated, and preventing relative movement between the first optical part 11, the second optical part 12 and the third optical part 13.

[0034] In summary, by arranging two groups of lenses and filling silica gel between the lenses and the light source assembly 20, the interface reflection of the incident surface can be eliminated, the transmittance of the outgoing light ray is effectively improved, and different light distribution angles can be achieved by controlling the curvature of the total reflection surface.

[0035] The above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An optical system characterized by comprising: The optical system comprises an optical assembly and a light source assembly, the optical assembly has an incident side and an emission side arranged oppositely, and the light source assembly is arranged towards the incident side, the optical assembly comprises a first optical part and a second optical part, the second optical part is arranged outside the first optical part, an inner side wall of the first optical part is a first total reflection surface, an inner side wall of a side of the second optical part away from the first optical part is a second total reflection surface, light emitted by the light source assembly is refracted at the incident side, reflected by the first total reflection surface and the second total reflection surface respectively, and then refracted at the emission side to be emitted; a third optical part is further arranged between the optical assembly and the light source assembly, light emitted by the light source assembly enters the first optical part and the second optical part respectively after passing through the third optical part, and the third optical part is made of silica gel; A limiting part of the first emission surface of the first optical part extends towards a second emission surface of the second optical part, a groove for accommodating the limiting part is correspondingly arranged on the second emission surface, and the limiting part is fixed relative to the second optical part by cooperating with the groove; the first optical part, the second optical part and the third optical part are fixed relative to each other by a shell.

2. The optical system of claim 1, wherein: The first optical part and the second optical part are both in a horn shape, the second optical part is arranged around the outside of the first optical part, and the first optical part and the second optical part are centrally symmetrical relative to the same axis.

3. The optical system of claim 1, wherein: The first optical part and the second optical part are both in a strip shape, and the second optical part comprises two parts arranged on both sides of the first optical part.

4. The optical system of claim 1, wherein: The third optical part has the same refractive index as the second optical part.

5. The optical system of claim 1, wherein: The first total reflection surface and the second total reflection surface are both free curved surfaces.

6. The optical system of claim 1, wherein: The first optical part has a first incident surface at the incident side, the second optical part has a second incident surface at the incident side, the first optical part has the first emission surface at the emission side, the second optical part has the second emission surface at the emission side, the first incident surface and the second incident surface are arranged staggeredly, and the first emission surface and the second emission surface are located in the same plane.

7. A luminaire characterized by, The optical system comprises the optical system as claimed in any one of claims 1-6.

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