Light-emitting apparatus and color-matching apparatus

• US 9,985,182 B2
• Filed: 12/22/2016
• Issued: 05/29/2018
• Est. Priority Date: 12/25/2015
• Status: Active Grant

• Current Assignee: Citizen Electronics Company Limited, Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Electronics Company Limited, Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Inventors: Watanabe, Yuka, Yano, Takakazu
• Primary Examiner(s): Hammond, Crystal L
• Application Number:
  US15/388,636
• Publication Number:
  US 20170196060A1
• Time in Patent Office: 523 Days
• Field of Search: None
• 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 33/32 containing nitrogen
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/60 Reflective elements
• 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: H05B 45/30 Driver circuits
• CPC Class Codes: H05B 45/395 Linear regulators

Abstract

Provided is a light-emitting apparatus including a board, a resin frame fixed on the board, sets of light-emitting elements mounted in a region on the board surrounded by the resin frame, wherein the light-emitting elements configuring each set are connected in series to each other. The light-emitting apparatus further includes connection electrodes provided on the board and electrically connected to the light-emitting elements and capable of supplying a drive current selectively to the sets of light-emitting elements, and a sealing resin which includes a phosphor mixed therein and excited by light from the light-emitting elements, and is filled so as to bury the region on the board, to seal integrally the light-emitting elements. The thickness of the sealing resin immediately above the light-emitting elements differs for the respective sets, and thereby, a chromaticity of light emitted from the sealing resin differs when each set of light-emitting elements emits the light singly.

Claims

1. A light-emitting apparatus comprising:

a board;

a resin frame fixed on the board;

a plurality of sets of light-emitting elements which are mounted in a region on the board surrounded by the resin frame, wherein the light-emitting elements configuring each of the sets are connected in series to each other;

a plurality of pairs of connection electrodes which are provided on the board, and electrically connected to the plurality of sets of light-emitting elements and capable of supplying a drive current selectively to some of the plurality of sets of light-emitting elements; and

a sealing resin which comprises a phosphor mixed therein and excited by light from the plurality of sets of light-emitting elements, and is filled in such a way as to bury the region on the board surrounded by the resin frame, to seal integrally the plurality of sets of light-emitting elements with a single sealing resin,

wherein a thickness of the sealing resin immediately above the plurality of sets of light-emitting elements differs for the respective sets, and thereby, a chromaticity of light emitted from the sealing resin differs when each of the sets of light-emitting elements emits the light singly,

wherein the light-emitting elements within each of the sets are placed at the same depth from an upper surface of the sealing resin, and the light-emitting elements of different sets are placed at different depths from the upper surface of the sealing resin.

2. The light-emitting apparatus according to claim 1, wherein the thickness of the sealing resin in a location where the plurality of sets of light-emitting elements are mounted is determined so that a chromaticity value of the emitted light may fall within a range of ±

2% around a chromaticity value of a center point of a region on a chromaticity diagram corresponding to one of a plurality of white colors classified based on Correlated Color Temperatures according to the ANSI C78.377 standard.

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

the plurality of sets of light-emitting elements are mounted on a horizontal mounting surface of the board,

a height of the resin frame from the mounting surface gradually decreases from one side of the board to the other side of the board opposed to the one side, and

the sealing resin seals the plurality of sets of light-emitting elements so that the thickness of the sealing resin may gradually decrease from the one side to the other side.

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

the board comprises a mounting surface sloping with respect to a horizontal plane,

the plurality of sets of light-emitting elements are mounted on the sloping mounting surface,

a height of the resin frame from the mounting surface increases with decrease in a height of the mounting surface from the horizontal plane, so that an upper end of the resin frame is kept positioned on an identical horizontal plane throughout a circumference of the resin frame, and

an upper end of the sealing resin is on the identical horizontal plane.

5. The light-emitting apparatus according to claim 4, wherein

the board is configured by a metal mounting board an upper surface of which is the sloping mounting surface and a circuit board having a uniform thickness and an opening, the circuit board being fixed to the upper surface of the mounting board and comprising the plurality of pairs of connection electrodes formed thereon, and

the plurality of sets of light-emitting elements are mounted on the upper surface of the mounting board exposed in the opening.

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

the board comprises a plurality of horizontal planes having a different height in a vertical direction due to steps formed on an upper surface of the board,

each of the sets of light-emitting elements is mounted in a location on the different height, and

an upper end of the sealing resin is on an identical horizontal plane.

7. The light-emitting apparatus according to claim 6, wherein

the board is configured by a metal mounting board and a circuit board, the metal mounting board having the plurality of horizontal planes, and the circuit board having a uniform thickness and an opening, being fixed to an upper surface of the mounting board, and comprising the plurality of pairs of connection electrodes formed thereon, and

the plurality of sets of light-emitting elements are mounted on the upper surface of the mounting board exposed in the opening.

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

any one of a plurality of light-emitting elements configuring the same set has the same emission wavelength band, and

some of the sets of light-emitting elements have an emission wavelength band different from that of the other sets of light-emitting elements.

9. A color-matching apparatus comprising:

a board;

a resin frame fixed on the board;

a plurality of sets of light-emitting elements which are mounted in a region on the board surrounded by the resin frame, wherein the light-emitting elements configuring each of the sets are connected in series to each other;

a plurality of pairs of connection electrodes which are provided on the board, and electrically connected to the plurality of sets of light-emitting elements and capable of supplying a drive current selectively to some of the plurality of sets of light-emitting elements;

a sealing resin which comprises a phosphor mixed therein and excited by light from the plurality of sets of light-emitting elements, and is filled in such a way as to bury the region on the board surrounded by the resin frame, to seal integrally the plurality of sets of light-emitting elements with a single sealing resin; and

a constant-current power supply connected to at least one of the plurality of pairs of connection electrodes, for supplying a drive current to a corresponding one of the plurality of sets of light-emitting elements so that light having a chromaticity corresponding to the set is emitted through the sealing resin,

wherein a thickness of the sealing resin immediately above the plurality of sets of light-emitting elements differs for the respective sets, and thereby, a chromaticity of light emitted from the sealing resin differs when each of the sets of light-emitting elements emits the light singly, and

wherein the light-emitting elements within each of the sets are placed at the same depth from an upper surface of the sealing resin, and the light-emitting elements of different sets are placed at different depths from the upper surface of the sealing resin.