# US 10,120,115 B2 · Illumination device

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- Number: US 10,120,115 B2
- Document ID: US10120115B2
- Status: Granted
- Kind: B2
- Application number: 15/783,945
- Filed: 2017-10-13
- Published: 2018-04-19
- Granted: 2018-11-06
- Earliest claimed: 2016-10-14
- Assignees: Nichia Corporation
- Applicants: Nichia Corporation
- Inventors: Katsuyuki Onozuka; Wataru Ogura; Yoshitaka Tanaka
- Web page: https://patentgrep.com/patent/US10120115B2

## CPC

- G02B 6/0006: {Coupling light into the fibre (in general G02B6/4298)}
- F21K 9/61: using light guides
- G02B 6/001: {the light being emitted along at least a portion of the lateral surface of the fibre}
- G02B 6/02342: {characterised by cladding features, i.e. light confining region}
- G02B 6/4298: {coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers}
- F21V 2200/10: of light guides of the optical fibres type
- F21Y 2101/00: Point-like light sources
- G02B 6/02319: {characterised by core or core-cladding interface features}
- G02B 6/4249: {comprising arrays of active devices and fibres}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

An illumination device includes: an optical fiber, the optical fiber allowing light emitted from a light source to be introduced at a first end portion thereof and to be guided through the optical fiber while emitting a portion of the light through a side surface of the optical fiber; a light-transmissive tube, the light-transmissive tube covering the side surface of the optical fiber such that a gap is located between the tube and the side surface of the optical fiber; and a light-shielding cap covering a second end portion of the tube at a side opposite the light source such that a space is located between a bottom portion of the cap and the second end portion of the tube. A second end portion of the optical fiber projects past the second end portion of the tube and is located at an inner side of the cap.

## Claims

### Claim 1

An illumination device comprising:
an optical fiber having a first end portion and a second end portion opposite to the first end portion, the optical fiber allowing light emitted from a light source to be introduced at the first end portion thereof and to be guided through the optical fiber while emitting a portion of the light through a side surface of the optical fiber;
a light-transmissive tube having a first end portion and a second end portion opposite to the first end portion, the light-transmissive tube covering the side surface of the optical fiber such that a gap is located between the tube and the side surface of the optical fiber; and
a light-shielding cap covering the second end portion of the tube at a side opposite the light source such that a space is located between a bottom portion of the cap and the second end portion of the tube,
wherein the second end portion of the optical fiber projects past the second end portion of the tube and is located at an inner side of the cap.

### Claim 2 (depends on 1)

The illumination device according to claim 1, wherein the cap is made of aluminum or an alloy of aluminum.

### Claim 3 (depends on 1)

The illumination device according to claim 1, wherein the tube comprises a phosphor tube containing a phosphor adapted to be excited by the portion of light emitted from the side surface of the optical fiber.

### Claim 4 (depends on 2)

The illumination device according to claim 2, wherein the tube comprises a phosphor tube containing a phosphor adapted to be excited by the portion of light emitted from the side surface of the optical fiber.

### Claim 5 (depends on 3)

The illumination device according to claim 3, wherein the tube comprises a light-transmissive tube at an inner side of the phosphor tube.

### Claim 6 (depends on 4)

The illumination device according to claim 4, wherein the tube comprises a light-transmissive tube at an inner side of the phosphor tube.