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JP-7855455-B2 - Optical components and illumination devices

JP7855455B2JP 7855455 B2JP7855455 B2JP 7855455B2JP-7855455-B2

Inventors

  • 野村 圭一郎
  • 豊嶋 隆延

Assignees

  • 株式会社小糸製作所

Dates

Publication Date
20260508
Application Date
20220810

Claims (7)

  1. Multiple light-emitting parts arranged along a predetermined direction and emitting light, The optical member comprises a light incident surface formed along the predetermined direction and having a light incident surface into which the light is incident, and a light emission surface arranged opposite to the light incident surface, The optical component is A central region located in the center of the predetermined direction, It has both side regions located on both sides of the central region along the predetermined direction, An illumination device characterized in that the central region has negative optical power, and the side regions have positive optical power.
  2. A lighting device according to claim 1, The central region has a concave lens shape, which is thin near the center and thick at the edges in the predetermined direction. The illumination device is characterized in that the two side regions have a convex lens shape with thin ends in the predetermined direction.
  3. A lighting device according to claim 1, The illumination device is characterized in that the central region has a meniscus lens shape in which the light incident surface and the light output surface are curved in the direction of light incidence in the predetermined direction.
  4. A lighting device according to any one of claims 1 to 3, The lighting device is characterized in that the light incident surface or the light emission surface has a lenticular portion formed thereon, in which the irregularities are repeated along a second direction perpendicular to the predetermined direction.
  5. A lighting device according to any one of claims 1 to 3, A lighting device characterized by having a collimating lens disposed between the optical element and the light-emitting part.
  6. A lighting device according to claim 5 , The illumination device is characterized in that the collimating lens is an internal total internal reflection lens having a refractive portion located in the center along a second direction perpendicular to the predetermined direction and reflecting portions located on both sides of the refractive portion.
  7. A lighting device according to claim 6, The lighting device is characterized in that the internal total internal reflection lens has the refractive portion and the reflective portion extended in the predetermined direction.

Description

This invention relates to optical components and illumination devices. Conventional light source devices using lenses that utilize total internal reflection, so-called TIR lenses, are known. A TIR lens comprises a refractive element located in the center and a reflective element located around the refractive element. For example, Patent Document 1 is known to disclose a light source device using a TIR lens. The optical unit (light source device) disclosed in Patent Document 1 comprises multiple light sources (light-emitting elements), multiple optical means (TIR lenses) having the function of collimating lenses, each arranged on the multiple light sources, and multiple lens arrays arranged on the emission surface side of the multiple optical means, forming multiple different light distribution patterns. The optical unit disclosed in Patent Document 1 is primarily used in vehicle lighting fixtures. Japanese Patent Publication No. 2021-189306 This figure schematically illustrates the outline of the lighting device 100 according to the first embodiment. Figure 1(a) is a schematic cross-sectional view along a predetermined direction, and Figure 1(b) is a schematic cross-sectional view along a second direction.This diagram schematically illustrates the outline of the lighting device 200 according to the second embodiment, and is a schematic cross-sectional view along a predetermined direction.These are schematic diagrams illustrating the propagation of light in the lighting devices 100 and 200. Figure 3(a) shows the light distribution adjustment lens 113, and Figure 3(b) shows the light distribution adjustment lens 213.This is a schematic diagram illustrating the propagation of light near the boundary where the positive and negative polarity of optical power switch. Figure 4(a) shows the light distribution adjustment lens 113, and Figure 4(b) shows the light distribution adjustment lens 213.This diagram schematically shows the range 213d having the maximum thickness in the light distribution adjustment lens 213.Figure 6(a) shows the virtual image display and luminance of lighting devices 100 and 200. Figure 6(b) shows the virtual image obtained with lighting device 100, Figure 6(c) shows the luminance distribution of lighting device 100, and Figure 6(d) shows the luminance distribution of lighting device 200.These graphs show the luminance distribution of lighting devices 100 and 200. Figure 7(a) shows the relative luminance distribution of lighting device 100, and Figure 7(b) shows the relative luminance distribution of lighting device 200.This figure shows the case where a lenticular portion 213c is provided on the light incident surface of the light distribution adjustment lens 213. Figure 8(a) is a schematic cross-sectional view along a predetermined direction, and Figure 8(b) is a schematic perspective view.This is a schematic diagram illustrating the overview and light irradiation of a conventional lighting device using a TIR lens. (First Embodiment) Embodiments of the present invention will be described in detail below with reference to the drawings. The same or equivalent components, members, and processes shown in each drawing will be denoted by the same reference numerals, and redundant explanations will be omitted as appropriate. Figure 1 is a schematic diagram illustrating the outline of the lighting device 100 according to this embodiment, where Figure 1(a) is a schematic cross-sectional view along a predetermined direction, and Figure 1(b) is a schematic cross-sectional view along a second direction. In Figure 1(a), the horizontal direction is the x-axis direction (predetermined direction), the vertical direction is the z-axis direction, and the direction perpendicular to the plane of the paper is the y-axis direction (second direction). In Figure 1(b), the horizontal direction corresponds to the y-axis direction, the vertical direction corresponds to the z-axis direction, and the direction perpendicular to the plane of the paper corresponds to the x-axis direction. As shown in Figures 1(a) and 1(b), the lighting device 100 includes a light-emitting element 111, a TIR lens 112, a light distribution adjustment lens 113, a diffusion sheet 114, and a display unit 115. The light-emitting element 111 is an electronic component mounted on a mounting substrate (not shown) on which wiring is formed, and emits light in a predetermined color when current is supplied by a drive circuit. Multiple light-emitting elements 111 are arranged along the x-axis direction (a predetermined direction), and this corresponds to the light-emitting section in the present invention. Here, "arranged along the x-axis direction" includes cases that can be substantially considered as the x-axis direction, and may include inclinations of several degrees or staggered arrangements. The specific structure of the light-emitting element 111 is not limited, but an LED package can be used that combines a light-emitting diode (LED) that e