Light source unit for vehicular lighting tool and vehicular lighting tool

Patent metadata

Field	Value
Publication number	US-12455059-B2
Application number	US-202218723754-A
Country	US
Kind code	B2
Filing date	Dec 26, 2022
Priority date	Dec 28, 2021
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

A light source unit for a vehicle lamp includes a light generating portion including a light source that emits excitation light, a light emitting layer constituted of an inorganic material and emitting generated light by irradiation of the excitation light, and a holding member that holds the layer; and a lens member that irradiates the generated light from the layer in a front direction in a vehicle-mounted state. The unit further includes a reflective portion disposed between the layer and the lens member, capable of reflecting a part of light from outside of the lens member, and capable of transmitting the generated light generated in the layer; or a light absorbing portion disposed between the layer and the lens member, and absorbing a part of a wavelength component among light from outside of the lens member being associated with the generated light.

First claim

The invention claimed is:

1 . A light source unit for a vehicle lamp comprising:
a light generating portion including
a light source that emits excitation light,
a light emitting layer that is constituted by using an inorganic material, and emits generated light by irradiation of the excitation light, and
a holding member that holds the light emitting layer;
a lens member that irradiates the generated light from the light emitting layer in a front direction in a vehicle-mounted state; and a single reflective portion that is disposed between the light emitting layer and the lens member, and is capable of transmitting the generated light generated in the light emitting layer, wherein when the light source is turned off, the lens member reflects a part of light from outside of the lens member.

2 . The light source unit for a vehicle lamp according to claim 1 , wherein
the reflective portion is formed by using a metal vapor deposition film.

3 . The light source unit for a vehicle lamp according to claim 1 , wherein
the excitation light is blue, and the generated light and the lens member are red.

4 . The light source unit for a vehicle lamp according to claim 1 , wherein
the reflective portion has a reflectance that reflects 10% or more but less than 100% of the light that reaches the reflective portion, so that the reflective portion is visually recognized as a mirror surface, when inside of the lens member is viewed from outside of the lens member.

5 . The light source unit for a vehicle lamp according to claim 1 , wherein
the holding member is capable of transmitting the generated light, the light generating portion is formed on a first surface of the holding member, and the reflective portion is formed on a second surface opposite to the first surface of the holding member.

6 . The light source unit for a vehicle lamp according to claim 1 , further comprising
a transmissive member that transmits the generated light generated by the light generating portion, between the light emitting layer and the lens member, wherein the reflective portion is provided on the transmissive member.

7 . A light source unit for a vehicle lamp comprising:
a light generating portion including
a light source that emits excitation light,
a light emitting layer that is constituted by using an inorganic material, and emits generated light by irradiation of the excitation light, and
a holding member that holds the light emitting layer;
a lens member that irradiates the generated light from the light emitting layer in a front direction in a vehicle-mounted state; and a reflective portion that is disposed between the light emitting layer and the lens member, is capable of reflecting a part of light from outside of the lens member, and is capable of transmitting the generated light generated in the light emitting layer, wherein the reflective portion is formed on the lens member.

8 . A light source unit for a vehicle lamp comprising:
a light generating portion including
a light source that emits excitation light,
a light emitting layer that is constituted by using an inorganic material, and emits generated light by irradiation of the excitation light, and
a holding member that holds the light emitting layer;
a lens member that irradiates the generated light from the light emitting layer in a front direction in a vehicle-mounted state; and a light absorbing portion that is disposed between the light emitting layer and the lens member, and absorbs a part of a wavelength component among light from outside of the lens member being associated with the generated light.

9 . The light source unit for a vehicle lamp according to claim 8 , wherein
the excitation light is blue, and the generated light and the lens member are red.

10 . The light source unit for a vehicle lamp according to claim 9 , wherein
the light absorbing portion is a blue filter.

11 . The light source unit for a vehicle lamp according to claim 10 , wherein
the light absorbing portion is provided separately from the light generating portion and the lens member.

12 . The light source unit for a vehicle lamp according to claim 8 , wherein
the light absorbing portion is formed on the lens member.

13 . The light source unit for a vehicle lamp according to claim 8 , wherein
the light absorbing portion is formed in such a way that the light emitting layer is not visually recognized, when inside of the light source unit is viewed from outside of the lens member at a time of turning off of the light source.

Assignees

• Ichikoh Industries Ltd

Inventors

• Sato Yoshiro

Classifications

• F21S43/26231

  collimating, focusing, condensing or projecting beams, e.g. projection lenses or Fresnel lenses · CPC title

• F21S43/31

  Optical layout thereof · CPC title

• F21S43/255

  Filters · CPC title

• F21S43/19

  Attachment of light sources or lamp holders · CPC title

• F21S43/16

  Light sources where the light is generated by photoluminescent material spaced from a primary light generating element · CPC title