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JP-7856188-B2 - Optical components

JP7856188B2JP 7856188 B2JP7856188 B2JP 7856188B2JP-7856188-B2

Inventors

  • 辻 真俊
  • 安藤 浩

Assignees

  • 株式会社デンソー
  • トヨタ自動車株式会社
  • 株式会社ミライズテクノロジーズ

Dates

Publication Date
20260511
Application Date
20250226

Claims (5)

  1. The light guide (20) comprises: a first prism (70) including an incident surface (72) into which ambient light (Lo) from a blind spot region is incident and a light-shielding surface (75) connected to the incident surface into which ambient light is incident; a first reflective surface (31) that reflects light from the incident surface; a second reflective surface (32) that reflects light reflected by the first reflective surface; and a second prism (40) including an exit surface (42) that emits light from the incident surface and light reflected by the second reflective surface to the outside, and a surface (45) connected to the exit surface intersecting with the exit surface into which light from the light-shielding surface is incident. The light-shielding surface includes a rough surface (753), An optical component in which the surface roughness of the roughened surface is greater than the surface roughness of the incident surface.
  2. The light-shielding surface is connected to the rough surface and has a flat surface (451) whose surface roughness is less than that of the rough surface. The optical member according to claim 1, wherein the ratio of the area of the rough surface to the area of the light-shielding surface is 50% or more.
  3. The optical component according to claim 1 or 2, wherein the root mean square height of the rough surface is 0.1 μm or more.
  4. The optical member according to any one of claims 1 to 3, further comprising light-shielding portions (60, 80) that cover the rough surface and block light from outside the light guide.
  5. The optical component according to claim 4, wherein the light-shielding portion is a light-absorbing film that absorbs light.

Description

This disclosure relates to optical components. Conventionally, as described in Patent Document 1, a blind spot assist device comprising a semi-transparent mirror, a mirror, a light-transmitting member, and multiple prisms is known. The semi-transparent mirror is installed on the viewer's side. The mirror reflects light to the semi-transparent mirror. The light-transmitting member is installed between the semi-transparent mirror and the mirror. The multiple prisms are installed between the semi-transparent mirror and the viewer. Furthermore, each prism has a light-shielding layer on the side of the light-shielding member that does not face the light-incident surface. This light-shielding layer blocks light incident from the viewer's side. Patent No. 6372305 A diagram showing the configuration of a vehicle in which the optical component of the first embodiment is used.Perspective view of an optical component.Cross-sectional view of an optical component.Enlarged view of section IV in Figure 3.A schematic cross-sectional view showing the case when ambient light is incident on the incident surface of an optical component.A schematic cross-sectional view showing the case when ambient light is incident on the incident surface of a comparative optical element.Enlarged view of section VII in Figure 6.A diagram showing the relationship between the angle of incidence and reflectance of light incident on a flat surface for comparison.A schematic cross-sectional view showing what happens when light is incident on a rough surface of an optical component.A diagram showing the relationship between root mean square height and reflectance.A schematic cross-sectional view showing what happens when light from outside the optical component enters the light-shielding layer.Cross-sectional view of the optical component of the second embodiment.Enlarged view of section XIII in Figure 12.Cross-sectional view of the optical component of the third embodiment.Enlarged view of section XV in Figure 14.A schematic cross-sectional view showing the case when ambient light is incident on the light-shielding surface of an optical component.Enlarged view of section XVII in Figure 16. The embodiments will be described below with reference to the drawings. In the following embodiments, parts that are identical or equivalent to each other are denoted by the same reference numerals, and their descriptions are omitted. (First Embodiment) The optical member 10 of this embodiment is used, for example, in a vehicle 1. As shown in Figure 1, the vehicle 1 includes a steering wheel 2, a front windshield 3, side windows 4, pillars 5, and the optical member 10, etc. The optical member 10 is attached to the pillar 5, for example, and guides ambient light Lo from the blind spot area caused by the pillar 5 to the occupants of the vehicle 1, thereby allowing the occupants of the vehicle 1 to see the scenery in the blind spot area. The occupants of the vehicle 1 correspond to the viewers. Specifically, the optical component 10 comprises a light guide 20 and a light-shielding layer 60, as shown in Figures 2 to 4. Note that in Figures 3, 4, and the cross-sectional view described later, the cross-sectional hatching of the optical component 10 has been omitted for easier understanding. The light guide 20 is formed from, for example, a resin material such as polyethylene terephthalate, polycarbonate, polyethylene, and acrylic, or a light-transmitting material such as glass. The light guide 20 also has an incident surface 25, a first reflective surface 31, a second reflective surface 32, and a plurality of prisms 40. The incident surface 25 is the surface onto which ambient light Lo is incident. The first reflective surface 31 is located on the occupant side of the vehicle 1 and intersects with the incident surface 25. The light from the incident surface 25 is reflected by the first reflective surface 31. The second reflective surface 32 is connected to the incident surface 25 on the opposite side from the first reflective surface 31 and is parallel to the first reflective surface 31. Furthermore, the light reflected by the first reflective surface 31 is reflected by the second reflective surface 32. Here, the direction of the normal passing through the first reflective surface 31 is denoted as the normal direction Dn. The incident surface 25 is inclined with respect to the normal direction Dn. Furthermore, the incident surface angle Asi, which is the inclination angle of the incident surface 25 with respect to the normal direction Dn, is acute. The refractive index of the light guide 20 is n1. The refractive index of the external medium of the light guide 20 is n2. Furthermore, the incident angle when light from the incident surface 25 is reflected by the first reflective surface 31, and the incident angle when the light reflected by the first reflective surface 31 is reflected by the second reflective surface 32, are denoted as θi. In this case, the light guide 20