Method and apparatus for manufacturing a light-emitting device including correction of an application amount of a fluorescent resin based on a fluorescent particle concentration

• US 9,241,388 B2
• Filed: 05/11/2012
• Issued: 01/19/2016
• Est. Priority Date: 06/29/2011
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Oikaze, Hirotoshi, Nagahama, Katsuyuki, Nishiwaki, Kentaro, Kabetani, Yasuhiro
• Primary Examiner(s): Yuan, Dah-Wei D
• Assistant Examiner(s): Kurple, Karl
• Application Number:
  US13/700,145
• Publication Number:
  US 20130164865A1
• Time in Patent Office: 1,348 Days
• US Class Current: 1/1
• CPC Class Codes: B05B 12/084 responsive to condition of liquid or other fluent material already sprayed on the target, e.g. coating thickness, weight or pattern
• CPC Class Codes: B05C 11/1005 responsive to condition of liquid or other fluent material already applied to the surface, e.g. coating thickness, weight or pattern
• CPC Class Codes: G01N 2021/8427 Coatings
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources

Abstract

A method of manufacturing a light-emitting device which includes a light-emitting source is provided by applying, onto the light-emitting source, a fluorescent resin which includes fluorescent particles and is stored in and discharged from an applicator. The method includes measuring a first concentration which is a concentration of the fluorescent particles included in the fluorescent resin discharged from the applicator; and applying, onto the light-emitting source, the fluorescent resin in an application amount determined based on the first concentration which has been measured and reference data which indicates a relationship between a concentration of the fluorescent particles and an application amount of the fluorescent resin that enables the light-emitting device to have constant chromaticity.

Claims

1. An apparatus for manufacturing a light-emitting device by applying, onto a light-emitting source, a fluorescent resin which includes fluorescent particles and is stored in and discharged from an applicator, the apparatus comprising:

a controller programmed to control an application amount of the fluorescent resin that is discharged from the applicator;

a fluorescent particle measurer configured to measure a first concentration that is a number concentration of the fluorescent particles included in the fluorescent resin discharged from the applicator by counting the fluorescent particles included in the fluorescent resin discharged from the applicator;

a storage in which reference data is stored beforehand, the reference data indicating a relationship between a number concentration of the fluorescent particles and an application amount of the fluorescent resin that enables the light-emitting device to have constant chromaticity; and

a corrector which determines, based on the first concentration and the reference data, a corrected application amount of the fluorescent resin to be applied onto the light-emitting source and notifies the controller of the corrected application amount.

2. The apparatus according to claim 1,

wherein the fluorescent particle measurer includes:

an optical coherence tomograph which obtains a tomographic image of the fluorescent resin discharged from the applicator; and

a first concentration calculator which calculates the first concentration based on the tomographic image.

3. The apparatus according to claim 1,

wherein the fluorescent particle measurer measures the first concentration at predetermined time intervals.