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CN-121993758-A - Light turning film and lighting device

CN121993758ACN 121993758 ACN121993758 ACN 121993758ACN-121993758-A

Abstract

The present application relates to a light redirecting film and a lighting device having such a light redirecting film. The light turning film comprises a substrate layer, a prism structure, a first surface and a second surface, wherein the first main surface and the second main surface are oppositely arranged, the first main surface is used for receiving first light rays and second light rays, the prism structure is formed on the second main surface and extends along a first direction, the first surface and the second surface are inclined relative to the second main surface, the inclination angle of the first surface relative to the second main surface and the inclination angle of the second surface relative to the second main surface are arranged so that the first light rays enter the prism structure through the substrate layer, are transmitted to the first surface from the inside of the prism structure, are totally reflected to the second surface by the first surface and are refracted out from the second surface after being transmitted to the second surface from the inside of the prism structure, and the second light rays enter the prism structure through the substrate layer, are totally reflected to the first surface by the second surface and are totally reflected to the second surface and are refracted out from the second surface.

Inventors

  • FANG ZONGBAO
  • FANG HUI
  • ZHANG HENG

Assignees

  • 盐城维盛新材料有限公司

Dates

Publication Date
20260508
Application Date
20251231

Claims (10)

  1. 1. A light redirecting film comprising: a substrate layer having oppositely disposed first and second major surfaces, the first major surface for receiving first and second light rays; A prismatic structure formed on the second main surface and extending in a first direction, having a first surface and a second surface each inclined to the second main surface; The inclination angle of the first surface relative to the second main surface and the inclination angle of the second surface relative to the second main surface are set so that the first light enters the prism structure through the substrate layer, is transmitted to the first surface from the inside of the prism structure, is totally reflected to the second surface by the first surface and is refracted out from the second surface, and the second light enters the prism structure through the substrate layer, is transmitted to the second surface from the inside of the prism structure, is totally reflected to the first surface by the second surface, is totally reflected to the second surface by the first surface and is refracted out from the second surface.
  2. 2. The light redirecting film of claim 1 wherein the first light rays refract off the second surface at 25 ° to 44 ° relative to a normal to the second major surface and the second light rays refract off the second surface at 25 ° to 44 ° relative to a normal to the second major surface.
  3. 3. A light redirecting film according to claim 1 wherein the first surface and the second surface are aligned in a second direction perpendicular to the first direction and the first surface is inclined toward the second surface in a direction away from the second major surface and the second surface is inclined toward the first surface in a direction away from the second major surface.
  4. 4. A light redirecting film as recited in claim 3 wherein the first surface and the second major surface have a first angle alpha, the second surface has a second angle beta with the second major surface, and 58 deg. alpha≤68 deg., 76 deg. beta≤86 deg., 141 deg. alpha+beta≤149 deg..
  5. 5. A light redirecting film according to claim 3 or claim 4 wherein the prismatic structures are arranged in a plurality, the plurality of prismatic structures being aligned in the second direction; the prism structure is formed in a triangular prism shape.
  6. 6. A light redirecting film according to claim 5 wherein the refractive indices of the substrate layer and the prismatic structures are not less than 1.4 and not greater than 1.65.
  7. 7. A light redirecting film according to claim 6 wherein the refractive index of the substrate layer and the prismatic structures is 1.56.
  8. 8. A lighting device, comprising: the light redirecting film of any one of claims 1 to 7; a light source configured to emit the first light and the second light toward the first major surface.
  9. 9. A lighting device as recited in claim 8, wherein said light source is a lambertian body light source having a divergence angle of no greater than 40 ° and an optical axis of said light source is perpendicular to said first major surface.
  10. 10. A lighting device as recited in claim 8 or claim 9, wherein a majority of all light rays emitted by said light source which are directed toward said first major surface are said first light rays and said second light rays.

Description

Light turning film and lighting device Technical Field The application relates to the technical field of optics, in particular to a light turning film and a lighting device. Background For flat panel lighting or other lighting fixtures, the light output is affected by the LED light output direction or side-in lighting light output mode, and the light output direction is generally perpendicular to the light output surface. However, for special applications, it is required to obliquely illuminate or illuminate a specific area, such as emitting light at a specific angle to meet the illumination requirement of a special purpose, and control the divergence angle of the emitted light within a certain angle range, so as to prevent stray light or glare, or unnecessary light energy loss due to the fact that the emitted light is relatively diverged or even multiple beam splitting light occurs. Currently, the light-turning films on the market are limited by their physical structure and optical characteristics, their light energy utilization is not high, and the light deflection angle is generally smaller than 20 °, and there is no better solution for deflection at large angles, such as 20 ° to 40 °. Disclosure of Invention In order to solve at least one of the above technical problems, the present application provides a light redirecting film and a lighting device having the light redirecting film. In a first aspect, a light redirecting film is provided comprising: a substrate layer having oppositely disposed first and second major surfaces, the first major surface for receiving first and second light rays; A prismatic structure formed on the second main surface and extending in a first direction, having a first surface and a second surface each inclined to the second main surface; The inclination angle of the first surface relative to the second main surface and the inclination angle of the second surface relative to the second main surface are set so that the first light enters the prism structure through the substrate layer, is transmitted to the first surface from the inside of the prism structure, is totally reflected to the second surface by the first surface and is refracted out from the second surface, and the second light enters the prism structure through the substrate layer, is transmitted to the second surface from the inside of the prism structure, is totally reflected to the first surface by the second surface, is totally reflected to the second surface by the first surface and is refracted out from the second surface. In some possible embodiments, the first light rays are refracted out of the second surface at 25 ° -44 ° relative to a normal of the second main surface, and the second light rays are refracted out of the second surface at 25 ° -44 ° relative to a normal of the second main surface. In some possible embodiments, the first surface and the second surface are aligned in a second direction perpendicular to the first direction, and the first surface is inclined toward the second surface in a direction away from the second main surface, and the second surface is inclined toward the first surface in a direction away from the second main surface. In some possible embodiments, the first surface has a first angle α with the second major surface, the second surface has a second angle β with the second major surface, and 58+.alpha≤68°, 76+.beta≤86°, 141+.alpha+β≤149°. In some possible embodiments, the prism structures are configured in plurality, and a plurality of the prism structures are arranged along the second direction. In some possible embodiments, the prismatic structure is formed in a triangular prism shape. In some possible embodiments, the refractive index of the substrate layer and the prismatic structure is not less than 1.4 and not greater than 1.65. In some possible embodiments, the refractive index of the substrate layer and the prismatic structure is 1.56. In a second aspect, a lighting device is provided, comprising: The light redirecting film of the first aspect; a light source configured to emit the first light and the second light toward the first major surface. In some possible embodiments, the light source is a lambertian body light source having a divergence angle of no greater than 40 °, the optical axis of the light source being perpendicular to the first major surface. In some possible embodiments, a majority of all light rays emitted by the light source that are directed toward the first major surface become the first light ray and the second light ray. The light steering film comprises a substrate layer, a prism structure, a first surface and a second surface, wherein the first main surface and the second main surface are oppositely arranged, the first main surface is used for receiving first light rays and second light rays, the prism structure is formed on the second main surface and extends along a first direction, the first surface and the second surface are inclined re