LIGHTING DEVICE

• US 20160155775A1
• Filed: 07/14/2014
• Published: 06/02/2016
• Est. Priority Date: 07/18/2013
• Status: Active Grant

• Current Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Electronics Company Limited, Citizen Holdings Co., Ltd. (Citizen Electronics Company Limited)
• Inventors: Yano, Takakazu
• Granted Patent: US 9,812,493 B2
• Time in Patent Office: Days
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 3/061 the material being glass
• CPC Class Codes: F21V 3/062 the material being plastics
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 27/15 including semiconductor components having potential barriers, specially adapted for light emission
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 : Reflective elements

Abstract

In a first aspect of the present invention, a lighting device (100) includes a first light emitter (1) that includes a first light-emitting element (10) with a p-n junction (1Og), and a first side cover (11) partly covering a peripheral side surface (1Oc-1Of) of the first light-emitting element (10); a second light emitter (2) that includes a second light-emitting element (20) with a p-n junction (20g) and a second side cover (21) partly covering a peripheral side surface (20c-20f) of the second light-emitting element (20), and the first light emitter (1) and the second light emitter (2) are disposed to face each other at uncovered side portions (10c, 20c) that are uncovered by the first side cover (11) and the second side cover (21). It is disclosed that the first side cover (11) covers a quarter or more area of the peripheral side surface (1Oc-1Of) of the first light-emitting element (10).

Claims

1. A lighting device comprising:

a first light emitter comprising a first light-emitting element with a p-n junction and a first side cover partly covering a peripheral side surface of the first light-emitting element; and

a second light emitter comprising a second light-emitting element with a p-n junction and a second side cover partly covering a peripheral side surface of the second light-emitting element,

the first light emitter and the second light emitter being disposed to face each other at uncovered side portions that are uncovered by the first side cover and the second side cover.

2. The lighting device according to claim 1,

wherein the first light emitter and the second light emitter are configured to emit light with emission spectrum different from each other.

3. The lighting device according to claim 1,

wherein the first side cover covers a quarter or more area of the peripheral side surface of the first light-emitting element, and/or

wherein the second side cover covers a quarter or more area of the peripheral side surface of the second light-emitting element.

4. The lighting device according to claim 1,

wherein the first side cover is made of white resin, and/or

wherein the second side cover is made of white resin.

5. The lighting device according to claim 4,

wherein the white resin comprises a titanium oxide particle.

6. The lighting device according to claim 1,

wherein the first light emitter further comprises a first light-transmitting layer comprising a phosphor that can be excited by light from the first light-emitting element, and

wherein the first light-transmitting layer covers at least an upper surface of the first light-emitting element above a light-emitting surface of the p-n junction and the uncovered side portion that is uncovered by the first side cover, and/or

wherein the second light emitter further comprises a second light-transmitting layer comprising a phosphor that can be excited by light from the second light-emitting element, and

wherein the second light-transmitting layer covers at least an upper surface of the second light-emitting element above a light-emitting surface of the p-n junction and the uncovered side portion that is uncovered by the second side cover.

7. The lighting device according to claim 1,

wherein the first light emitter further comprising a substrate on that the first light-emitting element is electrically mounted and a first light-transmitting layer comprising a phosphor that can be excited by light from the first light-emitting element on the substrate, and the first light-transmitting layer is arranged on the substrate to seal the first light-emitting element on the substrate, and

wherein the first side cover that partly covers the peripheral side surface of the first light-emitting element is disposed in contact with a part of peripheral side surface of the first light-transmitting layer and partly covers the peripheral side surface of the first light-transmitting layer, and/or

wherein the second light emitter further comprising a substrate on that the second light-emitting element is electrically mounted and a second light-transmitting layer is arranged on the substrate to seal the second light-emitting element on the substrate, and

wherein the second side cover that partly covers the peripheral side surface of the second light-emitting element is disposed in contact with a part of peripheral side surface of the second light-transmitting layer and partly covers the peripheral side surface of the second light-transmitting layer.

8. The lighting device according to claim 1,

wherein the first side cover at a position opposite to the uncovered side portion that is uncovered by the first side cover is greater in height from an upper surface of the substrate than the first light-transmitting layer from the upper surface of the substrate at a position adjacent to the uncovered side portion that is uncovered by the first side cover, and/or

wherein the second side cover at a position opposite to the uncovered side portion that is uncovered by the second side cover is greater in height from the upper surface of the substrate than the second light-transmitting layer from the upper surface of the substrate at a position adjacent to the uncovered side portion that is uncovered by the second side cover.

9. The lighting device according to claim 1,

wherein the first light emitter further comprises a light diffusion layer arranged over at least the uncovered side portion uncovered by the first side cover, and/or

wherein the second light emitter further comprises a light diffusion layer arranged over at least the uncovered side portion uncovered by the second side cover.

11. The lighting device according to claim 1,

wherein the first side cover is greater in height than the second side cover, or

wherein the second side cover is greater in height than the first side cover.

12. The lighting device according to claim 1,

wherein a first pair comprising the first light emitter and the second light emitter and a second pair comprising the first light emitter and the second light emitter are arranged one after another in a line and/or arranged side by side and/or arranged in an area.

13. The lighting device according to claim 12 further comprising:

a third light emitter being positioned inside of positions of the first light emitters and the second light emitters of the first and second pairs arranged in the area.

14. The lighting device according to claim 13,

wherein the first light emitter, the second light emitter, and the third light emitter are configured to emit light with emission spectrum different from each other.

15. The lighting device according to claim 13,

wherein the third light emitter is configured to emit light radially from the peripheral side surface.

16. The lighting device according to claim 1 further comprising:

a light-transmitting cover covering the light emitters; and

a base positioned below the light emitters to supply electrical current to the light emitters.

17. The lighting device according to claim 14,

wherein the third light emitter is configured to emit light radially from the peripheral side surface.

18. The lighting device according to claim 9,

wherein the light diffusion layer arranged over the at least the uncovered side portion that is uncovered by the first side cover includes a reflective particle, and/or

wherein the light diffusion layer arranged over the at least the uncovered side portion that is uncovered by the second side cover includes a reflective particle.

10. (canceled)