Light-emitting device, lighting device, and optical member

Patent metadata

Field	Value
Publication number	US-11924937-B2
Application number	US-202117327047-A
Country	US
Kind code	B2
Filing date	May 21, 2021
Priority date	Oct 31, 2018
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

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.

First claim

The invention claimed is:

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.

2. 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.

3. 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.

4. 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.

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.

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

7. 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.

8. 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.

9. 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.

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, each of 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 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 light emitted from the first light-emitting elements and the second light-emitting elements changes according to the current in case that the current is more than the current value.

11. 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.

12. 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.

13. 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 el

Assignees

• Nichia Corp

Inventors

• Shima Kohei
• Kawano Yohei
• Asano Akira

Classifications

• H05B45/20 Primary

  Controlling the colour of the light · CPC title

• F21K9/237

  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) · CPC title

• F21K9/278

  Arrangement or mounting of circuit elements integrated in the light source · CPC title

• F21K9/61 Primary

  using light guides · CPC title

• F21V5/045

  the lens having discontinuous faces, e.g. Fresnel lenses · CPC title