# US 12,000,552 B2 · Laser-based fiber-coupled white light system for a vehicle

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- Number: US 12,000,552 B2
- Document ID: US12000552B2
- Status: Granted
- Kind: B2
- Application number: 16/380,217
- Filed: 2019-04-10
- Published: 2020-07-23
- Granted: 2024-06-04
- Earliest claimed: 2019-01-18
- Assignees: KYOCERA SLD Laser, Inc.
- Applicants: KYOCERA SLD Laser, Inc.
- Inventors: Paul Rudy; James W. Raring
- Web page: https://patentgrep.com/patent/US12000552B2

## CPC

- F21S 41/16: Laser light sources
- B60Q 1/04: the devices being headlights
- B60Q 3/62: using light guides
- F21S 41/176: Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
- F21S 41/24: Light guides
- F21S 43/251: the light guides being used to transmit light from remote light sources
- F21S 43/253: {Two or more juxtaposed light guides}
- G02B 6/0006: {Coupling light into the fibre (in general G02B6/4298)}
- G02B 6/0008: {the light being emitted at the end of the fibre}
- G02B 6/001: {the light being emitted along at least a portion of the lateral surface of the fibre}
- H01S 5/0087: {for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials}
- H01S 5/0225: Out-coupling of light
- H01S 5/02257: using windows, e.g. specially adapted for back-reflecting light to a detector inside the housing
- H01S 5/02326: Arrangements for relative positioning of laser diodes and optical components, e.g. grooves in the mount to fix optical fibres or lenses
- H01S 5/22: having a ridge or stripe structure
- H01S 5/2201: {in a specific crystallographic orientation}
- H01S 5/34333: {with a well layer based on Ga(In)N or Ga(In)P, e.g. blue laser}
- B60Q 3/14: lighting through the surface to be illuminated
- B60Q 3/217: Doors, e.g. door sills; Steps
- B60Q 3/64: for a single lighting device
- B60Q 3/74: for overall compartment lighting; for overall compartment lighting in combination with specific lighting, e.g. room lamps with reading lamps (general lighting mounted on specific fittings B60Q3/20; general lighting for mass transit vehicles B60Q3/43)
- F21W 2102/13: for high-beam region or low-beam region
- F21W 2103/55: Daytime running lights [DRL]
- F21W 2104/00: Exterior vehicle lighting devices for decorative purposes
- H01S 5/0215: {Bonding to the substrate}
- H01S 5/0217: {Removal of the substrate}
- H01S 5/02212: Can-type, e.g. TO-CAN housings with emission along or parallel to symmetry axis
- H01S 5/02345: Wire-bonding
- H01S 5/0287: {Facet reflectivity}
- H01S 5/2009: {by using electron barrier layers}
- H01S 5/3063: {using Mg}
- H01S 5/4056: {emitting light in more than one direction}
- H10H 20/042: {Superluminescent diodes}
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- B60Q: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A laser-based fiber-coupled white light system is provided. The system includes a laser device comprising a gallium and nitrogen containing emitting region having an output facet configured to output a laser emission with a first wavelength ranging from 385 nm to 495 nm. The system further includes a phosphor member integrated with light collimation elements. The phosphor member converts the laser emission with the first wavelength to a phosphor emission with a second wavelength in either reflective or transmissive mode and mixed partially with laser emission to produce a white light emission. The system includes a transport fiber coupled to the phosphor member via the light collimation elements to receive the white light emission and deliver the white light emission remotely to a lighthead for either directly distributing white light on road or to a leaky fiber for illumination applications by side-scattering.

## Claims

### Claim 1

A laser-based fiber-coupled white light illumination source for automobile comprising:
a white light source module having a transparent lid member for emitting a white light emission, comprising:
a laser device comprising a gallium and nitrogen containing material and configured as an excitation source, the laser device comprising an output facet configured to output a laser emission with a first wavelength ranging from 385 nm to 495 nm;
a phosphor member configured as a wavelength converter and an emitter and disposed to allow the laser emission being optically coupled to a primary surface of the phosphor member;
an angle of incidence configured between the laser emission and the primary surface of the phosphor member, the laser emission forming a spot greater than 5 μm on the primary surface of the phosphor member, the phosphor member configured to convert at least a fraction of the laser emission with the first wavelength to a phosphor emission with a second wavelength that is longer than the first wavelength; and
a reflection mode characterizing the phosphor member with the white light emission emitted from a source diameter of about 0.33 mm to 0.625 mm with a total luminous flux of about 1600 lumens or greater, the white light emission being generated from at least an interaction of the laser emission with the phosphor emission emitted from the primary surface, the white light emission comprising of a mixture of wavelengths characterized by at least the second wavelength from the phosphor member; and
an optics member mounted on the transparent lid member of the white light source module and configured to receive the white light emission from the primary surface of the phosphor member and to focus the white light emission to provide a focused white light emission;
a fiber configured to have a first end to couple with the optics member to capture the focused white light emission with at least 20% coupling efficiency and transport light at least partially along a fiber axis to a respective second end, the fiber being configured at least partially as a leaky fiber to form an illumination source for the automobile; and
a cover extending around external edges of the white light source module and coupled to a periphery of the optics member and to a first end portion of the fiber, wherein the first end portion of the fiber extends through a first aperture of the cover and the white light source module is arranged in a second aperture of the cover so that a bottom portion of the white light source module is exposed outside the cover.

### Claim 2 (depends on 1)

The white light illumination source of claim 1, wherein white light source module comprises a package in a surface-mount device (SMD) type with a form factor <60 mm.

### Claim 3 (depends on 1)

The white light illumination source of claim 1, wherein the white light source module comprises a flat package.

### Claim 4 (depends on 1)

The white light illumination source of claim 1, wherein the fiber comprises a glass fiber or a plastic fiber.

### Claim 5 (depends on 1)

The white light illumination source of claim 1, wherein the leaky fiber is coupled with the optics member.

### Claim 6 (depends on 1)

The white light illumination source of claim 1, wherein the white light emission is a Lambertian emission within a FWHM cone angle of about 120 degrees, and the focused white light emission enters into the first end of the fiber with a coupling efficiency of greater than 40%.

### Claim 7 (depends on 1)

The white light illumination source of claim 1, wherein the leaky fiber comprises directional side scattering characteristics yielding preferential illumination in a range of angles off zero degrees along the length of fiber body up to 90 degrees perpendicular to the fiber body.

### Claim 8 (depends on 7)

The white light illumination source of claim 7, wherein the leaky fiber comprises a light output characterized by an effective luminous flux of greater than 25 lumens.

### Claim 9 (depends on 1)

The white light illumination source of claim 1, wherein the illumination source containing the leaky fiber is disposed around a front grill structure.

### Claim 10 (depends on 1)

The white light illumination source of claim 1, wherein the illumination source containing the leaky fiber is disposed near front lower bumper structure or around license plate.

### Claim 11 (depends on 1)

The white light illumination source of claim 1, wherein the illumination source containing the leaky fiber is configured as daytime running light around a headlight module of the automobile.

### Claim 12 (depends on 1)

The white light illumination source of claim 1, wherein the leaky fiber is disposed on and/or arranged for illuminating at least one of floor board, headliner, dashboard, wheel, door panel, door handle, door entry sill, moonroof, ceiling frame, and seating.

### Claim 13

A laser-based-fiber-coupled white light illumination source for a vehicle, the fiber-coupled white light illumination source comprising:
a package configured to emit a white light emission, the package comprising:
a laser device comprising a gallium and nitrogen containing material and configured as an excitation source, the laser device comprising an output facet configured to output a laser emission with a first wavelength ranging from 385 nm to 495 nm;
a phosphor member configured as a wavelength converter and an emitter and disposed to convert the laser emission to emit an electromagnetic radiation with a second wavelength longer than the first wavelength, the electromagnetic radiation is combined with the laser emission partially to generate the white light emission of at least 800 lumens;
a support member configured to support the laser device and the phosphor member;
a transparent lid member coupled to the support member and configured to allow the white light emission to pass through the transparent lid member;
an optical member mounted on the transparent lid member and configured to receive the white light emission passing through the transparent lid member and to focus the white light emission to provide a focused white light emission;
a fiber having a diameter of less than 2 mm configured to couple the focused white light emission from the optical member with at least 20% coupling efficiency and deliver the focused white light emission, wherein the fiber also is at least partially configured as a leaky fiber to scatter light partially out of fiber body arranged in a custom shape at a feature location; and
a cover extending around external edges of the package and coupled to a periphery of the optical member and to a first end portion of the fiber, wherein the first end portion of the fiber extends through a first aperture of the cover and the package is arranged in a second aperture of the cover so that a bottom portion of the package is exposed outside the cover.

### Claim 14 (depends on 13)

The laser-based-fiber-coupled white light illumination source of claim 13, wherein the leaky fiber is configured to provide a directional side scattering of the light via a wide angular range from greater than 0 up to 90 degrees.

### Claim 15 (depends on 13)

The laser-based-fiber-coupled white light illumination source of claim 13, wherein the leaky fiber comprises a light output characterized by an effective luminous flux of greater than 25 lumens.

### Claim 16 (depends on 13)

The laser-based-fiber-coupled white light illumination source of claim 13 further comprises one optical connector to connect a non-leaky fiber with the leaky fiber.

### Claim 17 (depends on 13)

The laser-based-fiber-coupled white light illumination source of claim 13, wherein the leaky fiber is shaped and disposed on and/or arranged for exterior illumination applications including at least one of daytime running light, decorative light around front grill structure, around license plate, and along lower or side bumper features.

### Claim 18 (depends on 13)

The laser-based-fiber-coupled white light illumination source of claim 13, wherein the leaky fiber is shaped and disposed on and/or arranged for illumination applications including at least one of decorative light in dashboard, along wheel, at door entry sill, floor board, seating, ceiling, or window.

### Claim 19

A fiber-coupled white light illumination source for vehicle lighting applications comprising:
a package having a transparent lid member for emitting a white light, the package comprising:
a laser module electrically coupled to a vehicle power system, the laser module comprising a gallium and nitrogen containing laser chip and a driver receiving power from the vehicle power system to drive the laser chip to output a laser emission with a first wavelength ranging from 385 nm to 495 nm;
a white light module comprising a phosphor member coupled with the laser module, the phosphor member being configured as a wavelength converter and an emitter to receive the laser emission at a primary surface of the phosphor member, the phosphor member configured to convert the laser emission to a phosphor radiation with a second wavelength longer than the first wavelength and to combine the phosphor radiation with the laser emission partially to generate the white light, the white light characterized by an emission of at least 300 lumens;
an optical member mounted on the transparent lid member of the package and configured to receive the white light from the primary surface of the phosphor member and to focus the white light to provide a focused white light;
a transport fiber having a diameter of 1 mm or less configured to couple the focused white light from the optical member with at least 20% coupling efficiency; and
a cover extending around external edges of the package and coupled to a periphery of the optical member and to a first end portion of the transport fiber, wherein the first end portion of the transport fiber extends through a first aperture of the cover and the package is arranged in a second aperture of the cover so that a bottom portion of the package is exposed outside the cover;
wherein the transport fiber is arranged to deliver light to an exterior or interior feature location of a vehicle; and
wherein the feature location of the vehicle includes at least one of a headlight, front grill structure, license plate, lower and side bumper, dashboard, door handle and panel, entry sill, window frame, ceiling, moonroof, floor, or seat.

### Claim 20 (depends on 19)

The fiber-coupled white light illumination source of claim 19, further comprising a leaky fiber coupled to the transport fiber and configured as an illumination element.

### Claim 21 (depends on 19)

The fiber-coupled white light illumination source of claim 19, wherein the transport fiber includes a section of non-leaky transport fiber connected or spliced to a section of leaky fiber configured as an illumination element.