Lighting device

Patent metadata

Field	Value
Publication number	US-2016223142-A1
Application number	US-201615096992-A
Country	US
Kind code	A1
Filing date	Apr 12, 2016
Priority date	Sep 2, 2011
Publication date	Aug 4, 2016
Grant date	—

Abstract

A lighting device may be provided that includes: a heat sink which includes a top surface and a member which has a side and is disposed on the top surface; a light source which includes a substrate disposed on the side of the member and light emitting devices disposed on the substrate, and has a reference point; and a cover which is coupled to the heat sink and includes an upper portion and a lower portion, which are divided by an imaginary plane passing through the reference point and being parallel with the top surface of the heat sink, wherein a distance from the reference point of the light source to the upper portion of the cover is larger than a distance from the reference point of the light source to the lower portion of the cover.

First claim

What is claimed is:

1 . A lamp, comprising:
an optically transmissive enclosure having an opening formed in a lower portion with an empty interior; a heat sink including:
a base member to couple to the optically transmissive enclosure, the base member including a first surface that is proximate to the optically transmissive enclosure, and
an extension member to extend from the first surface of the base member in a first direction into the optically transmissive enclosure, the first direction being perpendicular to the first surface of the base member, the extension member including a first end, a second end being proximate to the first surface of the base member, and a side surface being between the first end of the extension member and the second end of the extension member;
a plurality of light sources on the side surface of the extension member, each of the plurality of light sources including a substrate and a plurality of light emitting diodes disposed on the substrate; and
a lamp base to supply electric power to the light source,
wherein the plurality of light emitting diodes of the light source has an optical center of which distances from each of the plurality of light emitting diodes to are the same, and
wherein the optical center of the plurality of light emitting diodes of the light source is within a range of 28% to 59% with reference to a distance from the first surface of the base member to a top of the optically transmissive enclosure.

2 . The lamp according to claim 1 , wherein the first surface of the base member has a center point,
wherein the base member includes heat radiation fins extended in a second direction perpendicular to the first direction, and wherein an angle between the side surface of the extension member and an imaginary tangent line passing from the optical center of the plurality of light emitting diodes of the light source to an uppermost point of the heat radiation fins in the second direction with reference to the center point of the first surface of the base member is less than 45 degrees.

3 . The lamp according to claim 1 , wherein a length of a perimeter of the first end of the extension member is less than a length of a perimeter of the second end of the extension member.

4 . The lamp according to claim 1 , wherein an area of the side surface of the extension member is one and a half times larger than an area of the substrate of the light source.

5 . The lamp according to claim 2 , further comprising a circuitry disposed between the light source and the lamp base, wherein the base member includes a space to receive the circuitry.

6 . The lamp according to claim 5 , wherein a total number of the side surfaces of the member is equal to or greater than six.

7 . The lamp according to claim 5 , wherein the optically transmissive enclosure is coupled to the first surface of the base member by an adhesive material.

8 . The lighting device of claim 5 , wherein a material of the optically transmissive enclosure is formed of an opaque material.

9 . The lighting device of claim 5 , wherein the extension member is integrally formed with the base member of the heat sink.

10 . The lighting device of claim 5 , further comprising an aspheric lens disposed on at least one of the plurality of light emitting diodes.

11 . The lighting device of claim 1 , wherein the substrate is a printed circuit board.

12 . The lighting device of claim 5 , further comprising a case disposed between the base member of the heat sink and the lamp base to receive the circuitry,
wherein the case comprises a plastic or resin material.

13 . The lighting device of claim 12 , wherein the case is received in the space of the base member.

14 . The lamp according to claim 12 , wherein the substrate includes a first edge and a second edge, the second edge being proximate to the second end of the base member, and the first edge of the substrate being opposite to the second edge of the substrate, and
wherein the extension member includes a one-third point and a two-thirds point in the first direction from the second end of the extension member to the first end of the extension member.

15 . The lamp according to claim 14 , wherein the second edge of the substrate is higher than the one-third point of the extension member.

16 . The lamp according to claim 14 , wherein the substrate has a center point between the first edge of the substrate and the second edge of the substrate, and the center point of the substrate is higher than the two-thirds point of the extension member.

17 . The lamp according to claim 12 , wherein the substrate has a top surface and a bottom surface, the bottom surface of the substrate being closer to the first surface of the base member than the top surface of the substrate,
wherein the extension member has a one-third point and a two-thirds point in the first direction from the first surface of the base member to a top surface of the extension member, wherein a center point of the plurality of light emitting diodes is higher than the two-thirds point of the extension member, wherein the bottom surface of the substrate is higher than the one-third point of the extension member, wherein a center point of the substrate between the top surface of the substrate and the bottom surface of the substrate is higher than the two-thirds point of the extension member, and wherein the top surface of the substrate is higher than the two-thirds point of the extension member.

18 . The lighting device of claim 17 , wherein the center point of the plurality of light emitting diodes is closer to the top surface of the extension member than to the top surface of the base member.

19 . The lighting device of claim 17 , wherein the center point of the substrate is closer to the top surface of the extension member than to the one-thirds point of the extension member.

20 . The lighting device of claim 17 , wherein the top surface of the substrate is closer to the top surface of the extension member than to the one-thirds point of the extension member.

Assignees

• Lg Innotek Co Ltd

Inventors

• Jang Chul Ho
• Kang Bo Hee
• Kim Ki Hyun

Classifications

• F21V29/77

  with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section · CPC title

• F21K9/232

  specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb · CPC title

• F21V29/70

  characterised by passive heat-dissipating elements, e.g. heat-sinks · CPC title

• F21V29/503 Primary

  of light sources (cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H10H20/858) · CPC title

• F21Y2107/40

  on the sides of polyhedrons, e.g. cubes or pyramids · CPC title