# US 2021/0278060 A1 · Light-emitting device, lighting device, and optical member

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- Number: US 2021/0278060 A1
- Document ID: US20210278060A1
- Status: Published application
- Kind: A1
- Application number: 17/327,047
- Filed: 2021-05-21
- Published: 2021-09-09
- Earliest claimed: 2018-10-31
- Assignees: Nichia Corporation
- Applicants: Nichia Corporation
- Inventors: Kohei SHIMA; Yohei KAWANO; Akira ASANO
- Web page: https://patentgrep.com/patent/US20210278060A1

## CPC

- G02B 19/0028: {refractive and reflective surfaces, e.g. non-imaging catadioptric systems}
- H05B 45/20: Controlling the colour of the light
- F21K 9/237: Details of housings or cases, i.e. the parts between the light-generating element and the bases; Arrangement of components within housings or cases (F21K9/238 takes precedence)
- F21K 9/278: Arrangement or mounting of circuit elements integrated in the light source
- F21K 9/61: using light guides
- F21S 8/04: intended only for mounting on a ceiling or the like overhead structures (F21S8/02 takes precedence; {details of ceiling bases F21V21/03})
- F21V 5/045: {the lens having discontinuous faces, e.g. Fresnel lenses}
- F21V 7/04: Optical design
- F21V 23/04: the elements being switches (safety devices F21V25/00)
- G02B 19/0066: {in the form of an LED array}
- H05B 45/40: Details of LED load circuits
- F21V 7/0091: {using total internal reflection}
- F21Y 2105/18: annular; polygonal other than square or rectangular, e.g. for spotlights or for generating an axially symmetrical light beam
- F21Y 2115/10: Light-emitting diodes [LED]
- G02B 27/425: {in illumination systems (mask illumination systems in photolithographic systems G03F7/70158)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- 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

## Abstract

A light-emitting device includes an optical member including first and second light emitting elements, first and second light condenser portions, and a light guide portion. The first light condenser portion is disposed at a position corresponding to the first light-emitting element, and condenses a portion of light emitted from the first light-emitting element. The second light condenser portion surrounds the first light condenser portion, and condenses a portion of the light that is not incident to the first light condenser portion among the light emitted from the first light-emitting element. The light guide portion is disposed at a periphery of the second light condenser portion and at a position corresponding to the second light-emitting element, and guides light emitted from the second light-emitting element by causing total reflection in an interior of the light guide portion. A full width at half maximum of light exiting from the light guide portion is larger than a full width at half maximum of light exiting from the first light condenser portion.

## Claims

### Claim 1

A light-emitting circuit, comprising:
first light-emitting elements;
second light-emitting elements; and
resistance elements,
wherein a color temperature of light emitted from the second light-emitting elements is different from a color temperature of light emitted from the first light-emitting elements,
wherein an anode side terminal of a first circuit and an anode side terminal of a second circuit are connected to a first terminal of a direct-current power supply, the first circuit including the first light-emitting elements and the resistance elements, the first light-emitting elements and the resistance elements being connected in series in the first circuit, the second circuit including the second light-emitting elements,
wherein a cathode side terminal of the first circuit and a cathode side terminal of the second circuit are connected to a second terminal of the direct-current power supply, and
wherein resistance values of the resistance elements are adjusted so that a first current value is more than a second current value and the first current value is less than a third current value, the first current value being a value of a current input from the direct-current power supply at which a luminous flux of the first light-emitting elements is saturated, the second current value being a value of the current input from the direct-current power supply at which the second light emitting element starts to emit light, and the third current value being a value of the current input from the direct-current power supply at which a luminous flux of the second light-emitting elements is saturated.

### Claim 2 (depends on 1)

The light-emitting circuit according to claim 1, wherein
the resistance values of the resistance elements are adjusted so that an anode-cathode voltage of each of the first light-emitting elements and an anode-cathode voltage of each of the second light-emitting elements are equal in case that a value of the current input from the direct-current power supply is the third current value.

### Claim 3 (depends on 1)

The light-emitting circuit according to claim 1, wherein
a number of stages of the first light-emitting elements connected in series in the first circuit is less than a number of stages of the second light-emitting elements connected in series in the second circuit.

### Claim 4 (depends on 1)

The light-emitting circuit according to claim 1,
wherein the first light-emitting elements are disposed in a first region of a wiring substrate, and
wherein the second light-emitting elements are disposed in a second region of the wiring substrate, the second region surrounding the first region.

### Claim 5

A light-emitting circuit, comprising:
first light-emitting elements;
second light-emitting elements; and
resistance elements,
wherein a color temperature of light emitted from the second light-emitting elements is different from a color temperature of light emitted from the first light-emitting elements,
wherein an anode side terminal of a first circuit and an anode side terminal of a second circuit are connected to a first terminal of a direct-current power supply, the first circuit including the first light-emitting elements and the resistance elements, the first light-emitting elements and the resistance elements being connected in series in the first circuit, the second circuit including the second light-emitting elements,
wherein a cathode side terminal of the first circuit and a cathode side terminal of the second circuit are connected to a second terminal of the direct-current power supply,
wherein a luminous flux of the first light-emitting elements increases as a current input from the direct-current power supply increases in case that the current is less than a first current value,
wherein a luminous flux of the second light-emitting elements increases as the current increases in case that the current is more than a second current value, and
wherein the second current value is less than the first current value.

### Claim 6 (depends on 5)

The light-emitting circuit according to claim 5,
wherein a color temperature of a mixed light emitted from the first light-emitting elements and the second light-emitting elements is constant in case that the current is less than the second current value, and
wherein the color temperature of the mixed light changes according to the current in case that the current is more than the second current value.

### Claim 7 (depends on 5)

The light-emitting circuit according to claim 5, wherein
an anode-cathode voltage of each of the first light-emitting elements and an anode-cathode voltage of each of the second light-emitting elements are equal in case that a value of the current input from the direct-current power supply is a third current value at which a luminous flux of the second light-emitting elements is saturated.

### Claim 8 (depends on 5)

The light-emitting circuit according to claim 5, wherein
a number of stages of the first light-emitting elements connected in series in the first circuit is less than a number of stages of the second light-emitting elements connected in series in the second circuit.

### Claim 9 (depends on 5)

The light-emitting circuit according to claim 5,
wherein the first light-emitting elements are disposed in a first region of a wiring substrate, and
wherein the second light-emitting elements are disposed in a second region of the wiring substrate, the second region surrounding the first region.

### Claim 10

A light-emitting circuit, comprising:
first light-emitting elements;
second light-emitting elements; and
resistance elements,
wherein a color temperature of light emitted from the second light-emitting elements is different from a color temperature of light emitted from the first light-emitting elements,
wherein an anode side terminal of a first circuit and an anode side terminal of a second circuit are connected to a first terminal of a direct-current power supply, the first circuit including the first light-emitting elements and the resistance elements, the first light-emitting elements and the resistance elements being connected in series in the first circuit, the second circuit including the second light-emitting elements,
wherein a cathode side terminal of the first circuit and a cathode side terminal of the second circuit are connected to a second terminal of the direct-current power supply,
wherein a color temperature of a mixed light emitted from the first light-emitting elements and the second light-emitting elements is constant in case that a current input from the direct-current power supply is less than a current value, and
wherein the color temperature of the mixed light changes according to the current in case that the current is more than the current value.

### Claim 11 (depends on 10)

The light-emitting circuit according to claim 10, wherein
an anode-cathode voltage of each of the first light-emitting elements and an anode-cathode voltage of each of the second light-emitting elements are equal in case that a value of the current input from the direct-current power supply is a current value at which a luminous flux of the second light-emitting elements is saturated.

### Claim 12 (depends on 10)

The light-emitting circuit according to claim 10, wherein
a number of stages of the first light-emitting elements connected in series in the first circuit is less than a number of stages of the second light-emitting elements connected in series in the second circuit.

### Claim 13 (depends on 10)

The light-emitting circuit according to claim 10,
wherein the first light-emitting elements are disposed in a first region of a wiring substrate, and
wherein the second light-emitting elements are disposed in a second region of the wiring substrate, the second region surrounding the first region.