# US 12,215,838 B2 · Lighting tool for vehicle

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- Number: US 12,215,838 B2
- Document ID: US12215838B2
- Status: Granted
- Kind: B2
- Application number: 18/604,054
- Filed: 2024-03-13
- Published: 2024-09-19
- Granted: 2025-02-04
- Earliest claimed: 2023-03-16
- Assignees: Stanley Electric Co., Ltd.
- Applicants: Stanley Electric Co., Ltd.
- Inventors: Kazuki Abe; Norifumi Imazeki
- Web page: https://patentgrep.com/patent/US12215838B2

## CPC

- F21S 43/247: with a single light source being coupled into the light guide
- B60Q 1/2607: {comprising at least two indicating lamps}
- F21S 43/14: Light emitting diodes [LED]
- F21S 43/19: Attachment of light sources or lamp holders
- F21S 43/237: rod-shaped
- F21S 43/241: of complex shape
- F21S 43/245: emitting light from one or more of its major surfaces
- F21S 43/246: {having two or more output branches}
- F21S 43/249: with two or more light sources being coupled into the light guide
- F21S 43/2492: {having two or more input branches}
- F21S 43/31: Optical layout thereof
- F21S 43/50: characterised by aesthetic components not otherwise provided for, e.g. decorative trim, partition walls or covers
- B60Q 1/30: for indicating rear of vehicle, e.g. by means of reflecting surfaces
- B60Q 1/44: for indicating braking action {or preparation for braking, e.g. by detection of the foot approaching the brake pedal}
- F21W 2103/10: Position lights
- F21W 2103/35: Brake lights
- 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
- F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS

## Abstract

A lighting tool for a vehicle includes a first light source and a second light source, a first-light-guide-body that guides first light emitted from the first light source, and a second-light-guide-body that guides second light emitted from the second light source, the first-light-guide-body has a rod-shaped first light guide part, a first incidence part located on a base end side of the first light guide part, and a branch emission part that emits some of first light, which is guided in the first light guide part, to an outside of the first light guide part, and the second-light-guide-body has a rod-shaped second light guide part, a second incidence part located on a base end side of the second light guide part, and a branch incidence part that causes first light, which is emitted from the branch emission part, to enter the second light guide part.

## Claims

### Claim 1

A lighting tool for a vehicle comprising:
a first light source and a second light source;
a first light guide body configured to guide first light emitted from the first light source; and
a second light guide body configured to guide second light emitted from the second light source,
wherein the first light guide body has a rod-shaped first light guide part, a first incidence part and a branch emission part, the first incidence part being located on a base end side of the first light guide part and being configured to cause the first light emitted from the first light source to enter the first light guide part, the branch emission part being configured to emit some of the first light, which is guided in the first light guide part, to an outside of the first light guide part, and
the second light guide body has a rod-shaped second light guide part, a second incidence part and a branch incidence part, the second incidence part being located on a base end side of the second light guide part and being configured to cause the second light emitted from the second light source to enter the second light guide part, the branch incidence part being configured to cause the first light, which is emitted from the branch emission part, to enter the second light guide part.

### Claim 2 (depends on 1)

The lighting tool for a vehicle according to claim 1, wherein the first light guide body has a first branch part branched off from the first light guide part toward a tip side of the second light guide part, and
the branch emission part is located on a tip side of the first branch part.

### Claim 3 (depends on 1)

The lighting tool for a vehicle according to claim 1, wherein the second light guide body has a second branch part branched off from the second light guide part toward a base end side of the first light guide part, and
the branch incidence part is located on a tip side of the second branch part.

### Claim 4 (depends on 1)

The lighting tool for a vehicle according to claim 1, wherein the branch emission part and the branch incidence part are disposed to face each other.

### Claim 5 (depends on 1)

The lighting tool for a vehicle according to claim 1, wherein the first light source and the second light source are provided on a same surface of a same substrate, and emit the first light and the second light in the same direction.

### Claim 6 (depends on 5)

The lighting tool for a vehicle according to claim 5, comprising a shielding member that is provided between the first light source and the second light source and that is configured to shield light between the first light source and the second light source.

### Claim 7 (depends on 1)

The lighting tool for a vehicle according to claim 1, wherein the first light guide body has a first reflection part and a first emission part, the first reflection part being located on a back surface side of the first light guide part and being configured to reflect first light, which is guided toward the tip side of the first light guide part, toward a front surface side of the first light guide part, the first emission part being located on the front surface side of the first light guide part and being configured to emit the first light reflected by the first reflection part to the outside of the first light guide part,
wherein the second light guide body has a second reflection part and a second emission part, the second reflection part being located on a back surface side of the second light guide part and being configured to reflect second light, which is guided toward a tip side of the second light guide part, toward a front surface side of the second light guide part, the second emission part being located on the front surface side of the second light guide part and being configured to emit the second light reflected by the second reflection part to an outside of the second light guide part, and
wherein the first light that has entered the second light guide body from the branch incidence part is reflected by the second reflection part and then emitted from the second emission part to the outside of the second light guide part.

### Claim 8 (depends on 7)

The lighting tool for a vehicle according to claim 7, wherein a state in which red light is emitted from the first emission part and the second emission part as a tail lamp by turning on the second light source is switched to a state in which red light is emitted from the first emission part and the second emission part as a stop lamp by turning on the first light source.

### Claim 9 (depends on 7)

The lighting tool for a vehicle according to claim 7, wherein a state in which red light is emitted from the second emission part as a tail lamp by turning on the second light source is switched to a state in which red light is emitted from the first emission part and the second emission part as a stop lamp by turning on the first light source and the second light source.