METHOD OF MANUFACTURING LIGHT-EMITTING DEVICE AND APPARATUS FOR MANUFACTURING LIGHT-EMITTING DEVICE

• US 20130164865A1
• Filed: 05/11/2012
• Published: 06/27/2013
• Est. Priority Date: 06/29/2011
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Oikaze, Hirotoshi, Nishiwaki, Kentaro, Kabetani, Yasuhiro, Nagahama, Katsuyuki
• Granted Patent: US 9,241,388 B2
• Time in Patent Office: Days
• US Class Current: 438/15
• 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 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. A method of 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 method comprising:

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.

2. The method according to claim 1,

wherein in the measuring of the first concentration:

a tomographic image of the fluorescent resin discharged from the applicator is obtained using an optical coherence tomography unit; and

the first concentration is calculated based on the tomographic image.

3. The method according to claim 1,

wherein in the measuring of the first concentration:

the fluorescent resin discharged from the applicator is applied onto a transparent member;

the fluorescent resin applied onto the transparent member is irradiated with a measurement light of a wavelength which excites the fluorescent particles;

a light intensity of the measurement light which passed through the fluorescent resin applied onto the transparent member is measured; and

the first concentration is calculated based on the measured light intensity of the measurement light.

4. The method according to claim 1,

wherein the first concentration is measured at predetermined time intervals.

5. 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 which controls an application amount of the fluorescent resin that is discharged from the applicator;

a fluorescent particle measuring apparatus which measures a first concentration that is a concentration of 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 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 correction apparatus which determines, based on the first concentration and the reference data, an application amount of the fluorescent resin to be applied onto the light-emitting source and notifies the controller of the determined application amount.

6. The apparatus according to claim 5,

wherein the fluorescent particle measuring apparatus includes:

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

a first concentration calculation unit which calculates the first concentration based on the tomographic image.

7. The apparatus according to claim 5,

wherein the fluorescent particle measuring apparatus includes:

a measurement light source which irradiates, with a measurement light of a wavelength which excites the fluorescent particles, the fluorescent resin which is discharged from the applicator and applied onto a transparent member;

a measuring unit which measures a light intensity of the measurement light which passed through the fluorescent resin applied onto the transparent member; and

a second concentration calculation unit which calculates the first concentration based on the measured light intensity of the measurement light.

8. The apparatus according to claim 5,

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