Wide angle mini-LEDs combined with multifocal micro reflector cavity for thin portable device flashlight.
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| Title: | Wide angle mini-LEDs combined with multifocal micro reflector cavity for thin portable device flashlight. |
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| Authors: | Ye, Zhi Ting1 (AUTHOR) imezty@ccu.edu.tw, Hu, Chia Chun1 (AUTHOR), Chiua, Chang Che1 (AUTHOR) |
| Source: | International Journal of Optomechatronics. 2024, Vol. 18 Issue 1, p1-11. 11p. |
| Subjects: | Fresnel lenses, Flashlights, Luminous flux, Uniformity, Angles |
| Abstract: | LEDs employed in portable device flashes are Lambertian light sources, additional optical components such as Fresnel lenses and reflector cups must be incorporated to adjust the light distribution. This results in a need for a certain module thickness or high alignment precision. This paper introduces a modification in the packaging structure of mini-LEDs by employing a first optical design to create wide-angle mini-LEDs (WA mini-LEDs) with a light emission angle of 180°. A multi-focal micro-reflector cavity (MF-MRC) is included in the packaging process, thus enabling the achievement of a slim flash module. For the prototype design, measurements were conducted using WA mini-LEDs combined with a 2 mm height MF-MRC. The full width at half maximum can be reduced to 56° while maintaining a uniformity of up to 60% across all measurement points. Additionally, the center illuminance is 3.24 times higher compared to Lambertian mini-LED light sources. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Optomechatronics is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 181659130 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Wide angle mini-LEDs combined with multifocal micro reflector cavity for thin portable device flashlight. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ye%2C+Zhi+Ting%22">Ye, Zhi Ting</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> imezty@ccu.edu.tw</i><br /><searchLink fieldCode="AR" term="%22Hu%2C+Chia+Chun%22">Hu, Chia Chun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chiua%2C+Chang+Che%22">Chiua, Chang Che</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Optomechatronics%22">International Journal of Optomechatronics</searchLink>. 2024, Vol. 18 Issue 1, p1-11. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Fresnel+lenses%22">Fresnel lenses</searchLink><br /><searchLink fieldCode="DE" term="%22Flashlights%22">Flashlights</searchLink><br /><searchLink fieldCode="DE" term="%22Luminous+flux%22">Luminous flux</searchLink><br /><searchLink fieldCode="DE" term="%22Uniformity%22">Uniformity</searchLink><br /><searchLink fieldCode="DE" term="%22Angles%22">Angles</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: LEDs employed in portable device flashes are Lambertian light sources, additional optical components such as Fresnel lenses and reflector cups must be incorporated to adjust the light distribution. This results in a need for a certain module thickness or high alignment precision. This paper introduces a modification in the packaging structure of mini-LEDs by employing a first optical design to create wide-angle mini-LEDs (WA mini-LEDs) with a light emission angle of 180°. A multi-focal micro-reflector cavity (MF-MRC) is included in the packaging process, thus enabling the achievement of a slim flash module. For the prototype design, measurements were conducted using WA mini-LEDs combined with a 2 mm height MF-MRC. The full width at half maximum can be reduced to 56° while maintaining a uniformity of up to 60% across all measurement points. Additionally, the center illuminance is 3.24 times higher compared to Lambertian mini-LED light sources. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Optomechatronics is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=181659130 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/15599612.2024.2323464 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 1 Subjects: – SubjectFull: Fresnel lenses Type: general – SubjectFull: Flashlights Type: general – SubjectFull: Luminous flux Type: general – SubjectFull: Uniformity Type: general – SubjectFull: Angles Type: general Titles: – TitleFull: Wide angle mini-LEDs combined with multifocal micro reflector cavity for thin portable device flashlight. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ye, Zhi Ting – PersonEntity: Name: NameFull: Hu, Chia Chun – PersonEntity: Name: NameFull: Chiua, Chang Che IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: 2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 15599612 Numbering: – Type: volume Value: 18 – Type: issue Value: 1 Titles: – TitleFull: International Journal of Optomechatronics Type: main |
| ResultId | 1 |
