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Proceedings Paper

Optical design of the focal adjustable flashlight based on a power white-LED
Author(s): Jhih-You Cai; Yi-Chien Lo; Ching-Cherng Sun
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Paper Abstract

In the paper, we design a focal adjustable flashlight, which can provide the spotlight and the wide-angle illumination in different modes. For most users, they two request two illumination modes. In such two modes, one is high density energy of the light pattern and the other is the uniform light pattern in a wide view field. In designing the focal adjustable flashlight, we first build a precise optical model for the high-power LED produced by CREE Inc. in mid-field verification to make sure the accuracy of our simulation. Typically, the lens is useful to be the key component of the adjustable flashlight, but the optical efficiency is low. Here, we introduce a concept of so-called total internal refraction (TIR) lens into the design of flashlight. By defocusing the TIR lens, the flashlight can quickly change the beam size and energy density to various applications. We design two segments of the side of the TIR lens so that they can be applied to the two modes, and the flashlight provides a high optical efficiency for each mode. The illuminance of the center of light pattern at a distance of 2 m from the lamp is also higher than using the lens in the spotlight and wide-angle illumination. It provides good lighting functions for users.

Paper Details

Date Published: 21 September 2011
PDF: 5 pages
Proc. SPIE 8128, Current Developments in Lens Design and Optical Engineering XII; and Advances in Thin Film Coatings VII, 812806 (21 September 2011); doi: 10.1117/12.893449
Show Author Affiliations
Jhih-You Cai, National Central Univ. (Taiwan)
Yi-Chien Lo, National Central Univ. (Taiwan)
Ching-Cherng Sun, National Central Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8128:
Current Developments in Lens Design and Optical Engineering XII; and Advances in Thin Film Coatings VII
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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