JP-7855456-B2 - Optical components and illumination devices

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 (5)

1. A refracting part that refracts light, Arranged on both sides of the refraction portion , the reflecting portion receives the light from the incident surface of the reflecting portion and reflects the light at the light-reflecting surface , The system includes a light-emitting surface that emits transmitted light that has passed through the refracting portion and reflected light that has been reflected by the reflecting portion, The light-emitting surface is divided into a plurality of divided regions, each of which includes a central region that includes the center of the light-emitting surface, and steps are provided between the plurality of divided regions . The boundaries of the multiple division regions are provided with inclined portions that are tilted at a predetermined angle. The optical member is characterized in that the inclined portion adjacent to the central region overlaps with the incident surface of the reflective portion in a plan view .
2. A refracting part that refracts light, Arranged on both sides of the refraction portion , the reflecting portion receives the light from the incident surface of the reflecting portion and reflects the light at the light-reflecting surface , The system includes a light-emitting surface that emits transmitted light that has passed through the refracting portion and reflected light that has been reflected by the reflecting portion, The light-emitting surface is divided into a plurality of divided regions, each of which includes a central region that includes the center of the light-emitting surface, and steps are provided between the plurality of divided regions . The boundaries of the multiple division regions are provided with inclined portions that are tilted at a predetermined angle. The optical member is characterized in that a protrusion is erected on the light-emitting surface at a position that overlaps with the incident surface of the reflective portion in a plan view .
3. An optical member according to claim 1 or 2 , The optical member is characterized in that the light-emitting surface is formed by dividing a single planar or curved shape into the divided region.
4. An optical member according to claim 1 or 2 , The optical member is characterized in that the inclined portion has an inclination angle of 1 degree or more and 15 degrees or less with respect to the direction in which the step occurs.
5. An optical member as described in claim 1 or 2 , A lighting device characterized by having a light-emitting element positioned opposite the light-incident side of the refraction portion.

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. The light source devices described above are sometimes used as lighting devices (backlights) for head-up displays (HUDs) mounted in vehicles, for example. Light source devices used in HUDs require particularly bright and uniform illumination, i.e., high brightness and a uniform luminance distribution. The TIR lens described above can focus light that spreads outwards with a large angle (direction angle) with the emission axis from the light-emitting element, and is therefore often used as an optical means suitable for this purpose. Japanese Patent Publication No. 2021-189306 This is a schematic cross-sectional view illustrating the outline of the optical member 20 and the illumination device 100 according to the first embodiment.This is a partially enlarged cross-sectional view illustrating the structure of the light-emitting surface 23 of the optical component 20.This is a schematic diagram illustrating the lens thickness in the divided regions 23a to 23c of the light-emitting surface 23.This is a schematic cross-sectional view showing an example of the structure of the optical member 20 according to the second embodiment.This is a schematic cross-sectional view showing an example of the structure of the optical member 20 according to the third embodiment.This is a schematic cross-sectional view showing an example of the structure of the optical member 20 and the illumination device 100 according to the fourth embodiment. (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 cross-sectional view illustrating the outline of the optical member 20 and illumination device 100 according to this embodiment. As shown in Figure 1, the illumination device 100 has a light-emitting element 10 and an optical member 20. The light-emitting element 10 is an electronic component mounted on a mounting substrate (not shown) with wiring formed on it, and emits light in a predetermined color when current is supplied by a drive circuit. Multiple light-emitting elements 10 are arranged perpendicular to the plane of the paper. While the specific structure of the light-emitting element 10 is not limited, an LED package combining a light-emitting diode (LED) that emits primary light and a wavelength conversion member that converts a portion of the primary light into secondary light can be used. Furthermore, the material of the light-emitting diode is not limited, and known materials and structures can be used. For example, a GaN-based LED that emits blue light can be used. Similarly, the material of the wavelength conversion member is not limited; for example, a YAG-based phosphor material that emits yellow light when excited by blue light can be used. In this embodiment, the number of light-emitting elements 10 is shown in one row, but two or more rows are also possible. Also, the light-emitting element 10 is not limited to LEDs; it may be a semiconductor laser or the like. The optical element 20 is a component that receives light emitted by the light-emitting element 10, refracts and reflects the light, and illuminates it in a predetermined direction. As shown in Figure 1, the optical element 20 comprises a refracting portion 21, a reflecting portion 22, a light-emitting surface 23, and an inclined portion 24. Furthermore, the optical element 20 is formed by extending each part of the cross-sectional shape shown in Figure 1 in a direction perpendicular to the plane of the paper, constituting a uniaxial TIR (Total Internal Reflection) lens. The refracting portion 21 is positioned near the center of the optical member 20 and is the portion that refracts and transmits incident light. A curved refracting portion incident surface 21a is provided on the side of the refracting portion 21 facing the light-emitting element 10. While the shape of the refracting portion in