Light-emitting apparatus having different packaging densities

• US 10,429,050 B2
• Filed: 08/02/2016
• Issued: 10/01/2019
• Est. Priority Date: 08/03/2015
• Status: Active Grant

• Current Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Electronics Company Limited
• Inventors: Fukasawa, Koichi
• Primary Examiner(s): Mai, Anh T
• Assistant Examiner(s): Chiang, Michael
• Application Number:
  US15/226,303
• Publication Number:
  US 20170038051A1
• Time in Patent Office: 1,155 Days
• CPC Class Codes: F21V 29/503 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 H01L33/64
• CPC Class Codes: F21V 3/02 characterised by the shape
• 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 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H01L 33/641 characterized by the materials

Abstract

A light-emitting apparatus according to the present invention has a packaging substrate having a packaging area, a plurality of light-emitting elements packaged in the packaging area, and a sealing resin that seals the plurality of light-emitting elements. The plurality of light-emitting elements includes light-emitting elements packaged in a first packaging area including the center of the packaging area and light-emitting elements packaged in a second packaging area surrounding the perimeter of the first packaging area. The packaging density of the light-emitting elements packaged in the first packaging area is higher than the packaging density of the light-emitting elements packaged in the second packaging area.

Claims

1. A light-emitting apparatus comprising:

a packaging substrate having a packaging area;

a first electrical conduction pattern and a second electrical conduction pattern arranged along the periphery of the packaging area;

a first element group having a plurality of light-emitting elements;

a second element group having a plurality of light-emitting elements;

a third element group having a plurality of light-emitting elements;

a sealing resin that seals at least the first element group, the second element group and the third element group, and

a lens on the packaging substrate, wherein

the first element group, the second element group and the third element group are connected in parallel between the first electrical conduction pattern and the second electrical conduction pattern,

the packaging area includes a first packaging area including central portion of the packaging area and a second packaging area surrounding about the first packaging area,

the first element group includes a first portion arranged in the first packaging area, a second portion arranged in the second packaging area, and a third portion arranged in second packaging area, the plurality of light-emitting elements in the first portion, the second portion and the third portion are series-connected to each other,

the second element group includes a fourth portion connected with the first electrical conduction pattern in the second packaging area, a fifth portion connected with the second electrical conduction pattern in second packaging area, and a sixth portion connected in zigzags between the fourth portion and the fifth portion, the plurality of light-emitting elements in the fourth portion, the fifth portion and the sixth portion are series-connected to each other,

the third element group includes a seventh portion connected with the first electrical conduction pattern in the second packaging area, an eighth portion connected with the second electrical conduction pattern in second packaging area, and a ninth portion connected in zigzags between the seventh portion and the eighth portion, the plurality of light-emitting elements in the seventh portion, the eighth portion and the eighth portion are series-connected to each other,

the packaging interval of the plurality of light-emitting elements in the first portion is shorter than the packaging intervals of plurality of light-emitting elements in the second portion, third portion, the fourth portion, the fifth portion, the sixth portion, the seventh portion, the eighth portion and the ninth portion,

the optical axis of the lens substantially coincides with the center of the packaging area,

the packaging interval of the plurality of light-emitting elements in the first packaging area is narrower than 0.25 times the length of one side of the light-emitting elements,

the packaging interval of the plurality of light-emitting elements in the second packaging area is wider than 0.25 times the length of one side of the light-emitting elements, and

the packaging interval of the plurality of light-emitting elements in the first packaging area is equal or wider than 5 μ

m and equal or narrower than 50 μ

m.

2. The light-emitting apparatus according to claim 1, wherein

each of the light-emitting elements packaged in the first packaging area is arranged in the form of a lattice so that the interval between light-emitting elements adjacent to each other is a first interval, and

each of the light-emitting elements packaged in the second packaging area is arranged so that the interval between light-emitting elements adjacent to each other is a second interval wider than the first interval.

3. The light-emitting apparatus according to claim 1, wherein

the packaging substrate is a metal substrate.

4. The light-emitting apparatus according to claim 1, further comprising:

an optical element that is mounted on the packaging substrate so as to cover the sealing resin and which collects light emitted from the plurality of light-emitting elements.