# US 8,770,795 B2 · Light-emitting device and lighting apparatus

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- Number: US 8,770,795 B2
- Document ID: US8770795B2
- Status: Granted
- Kind: B2
- Application number: 13/236,672
- Filed: 2011-09-20
- Published: 2012-03-29
- Granted: 2014-07-08
- Earliest claimed: 2010-09-27
- Assignees: Toshiba Lighting & Technology Corporation
- Applicants: Kozo Uemura; Soichi Shibusawa; Shuhei Matsuda; Nobuhiko Betsuda; Kiyoshi Nishimura; Masatoshi Kumagai
- Inventors: Kozo Uemura; Soichi Shibusawa; Shuhei Matsuda; Nobuhiko Betsuda; Kiyoshi Nishimura; Masatoshi Kumagai
- Web page: https://patentgrep.com/patent/US8770795B2

## CPC

- H10W 90/00: Package configurations
- F21K 9/27: Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
- F21S 8/031: {the device consisting essentially only of a light source holder with an exposed light source, e.g. a fluorescent tube}
- F21V 23/023: {Power supplies in a casing (F21V23/003 takes precedence)}
- F21Y 2103/10: comprising a linear array of point-like light-generating elements
- F21Y 2105/10: comprising a two-dimensional [2D] array of point-like light-generating elements
- F21Y 2115/10: Light-emitting diodes [LED]
- H10H 20/853: characterised by their shape
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- 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
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- 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
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A light-emitting device includes a substrate, and a plurality of light-emitting elements mounted on the substrate. The light-emitting elements are placed to meet conditions that the number B of light-emitting elements per unit area (cm2) of a mounting part is not less than 0.4 and a mean mounting density D is not less than 58 to not greater than 334, when a relationship of formula “D=A×B” is established, assuming D as a mean mounting density of light-emitting elements on a substrate, A as a current (mA) flowing through one light-emitting element, and B as the number of light-emitting elements per unit area (cm2) of a substantial mounting part for light-emitting elements.

## Claims

### Claim 1

A light-emitting device comprising:
a substrate; and
a plurality of light-emitting elements mounted on the substrate,
wherein
the light-emitting elements are configured to be placed to meet conditions that the number B of light-emitting elements per unit area (cm2) of a mounting part is not less than 0.4 and a mean mounting density D is not less than 58 to not greater than 334, when the relationship of formula “D=A×B” is established, assuming D as a mean mounting density of light-emitting elements on a substrate, A as a current (mA) flowing through one light-emitting element, and B as the number of light-emitting elements per unit area (cm2) of a substantial mounting part for light-emitting elements.

### Claim 2 (depends on 1)

The light-emitting device according to claim 1, wherein
the light-emitting elements are configured to be placed to meet a condition that Ip/S is not less than 0.05 to not greater than 0.28, assuming Ip as the input power (Watt) of said plurality of light-emitting elements and S as an area (cm2) on the substrate.

### Claim 3 (depends on 1)

The light-emitting device according to claim 1, wherein
the lighting-elements are configured to be placed in at least one line of light-emitting elements linearly arranged at an equal interval in adjacent light-emitting elements.

### Claim 4 (depends on 3)

The light-emitting device according to claim 3, wherein
the mounting part is configured to be formed to meet the following an equation,
S={L1×(P/n+1)}×{L1+W1×(n-1)}
assuming L1 as an interval between the light-emitting elements, P as the total number of the light-emitting elements, n as the number of lines of light-emitting elements, W1 as an interval between the lines of light-emitting elements, and S as an area of the mounting part.

### Claim 5 (depends on 3)

The light-emitting device according to claim 3, wherein
adjacent lines of light-emitting elements are arranged at an interval within not greater than ten times of an interval between adjacent light-emitting elements in each line, when the light-emitting elements are arranged in at least two lines of light-emitting elements.

### Claim 6 (depends on 1)

The light-emitting device according to claim 1, wherein
the substrate is made of material with relatively low heat conductivity.

### Claim 7 (depends on 6)

The light-emitting device according to claim 6, wherein
the substrate is a glass epoxy substrate, or a glass composite substrate.

### Claim 8 (depends on 1)

The light-emitting device according to claim 1, further comprising:
a fluorescent layer configured to contain a fluorescent material which is excited by the light emitted from the light-emitting element and emit light, the fluorescent layer including a plurality of convex fluorescent parts which have a dome-shape bulged at the center and cover the light-emitting elements respectively.

### Claim 9 (depends on 8)

The light-emitting device according to claim 8, wherein
the convex fluorescent part is formed continuously to an adjacent convex fluorescent part at the base.

### Claim 10

A luminaire comprising:
a main body; and
a light-emitting device configured to be placed in the main body, wherein
the light-emitting device comprises a substrate, and a plurality of light-emitting elements mounted on the substrate, and
the light-emitting elements are configured to be placed to meet conditions that the number B of light-emitting elements per unit area (cm2) of a mounting part is not less than 0.4 and a mean mounting density D is not less than 58 to not greater than 334, when the relationship of formula “D=A×B” is established, assuming D as a mean mounting density of light-emitting elements on a substrate, A as a current (mA) flowing through one light-emitting element, and B as the number of light-emitting elements per unit area (cm2) of a substantial mounting part for light-emitting elements.

### Claim 11 (depends on 10)

The luminaire according to claim 10, further comprising
a lamp configured to contain a part diffusive and translucent to the light emitted from the light-emitting element, and wherein
the light-emitting device is contained in the lamp.