US 12,408,253 B2
Variable focus flashlight module
Yi-Wei Liu, Guangzhou (CN); and Tsung-Kai Chang, Guangzhou (CN)
Assigned to GUANGZHOU LUXVISIONS INNOVATION TECHNOLOGY LIMITED, Guangzhou (CN)
Filed by GUANGZHOU LUXVISIONS INNOVATION TECHNOLOGY LIMITED, Guangzhou (CN)
Filed on Jul. 1, 2024, as Appl. No. 18/760,025.
Claims priority of provisional application 63/600,725, filed on Nov. 19, 2023.
Claims priority of application No. 202410428131.3 (CN), filed on Apr. 10, 2024.
Prior Publication US 2025/0168952 A1, May 22, 2025
Int. Cl. G02B 9/12 (2006.01); F21V 5/00 (2018.01); F21V 5/04 (2006.01); H05B 47/155 (2020.01); F21Y 105/16 (2016.01); F21Y 115/10 (2016.01)
CPC H05B 47/155 (2020.01) [F21V 5/004 (2013.01); F21V 5/006 (2013.01); F21V 5/008 (2013.01); F21V 5/045 (2013.01); G02B 9/12 (2013.01); F21Y 2105/16 (2016.08); F21Y 2115/10 (2016.08)] 5 Claims
OG exemplary drawing
 
1. A variable focus flashlight module, sequentially from a magnified side to a minified side along an optical axis of the variable focus flashlight module, comprising:
a first lens, having a negative refracting power, wherein the first lens is a negative meniscus lens with a concave surface facing the magnified side;
a second lens, having a positive refracting power, wherein the second lens is a biconvex lens;
a third lens, having a positive refracting power, wherein the third lens is a biconvex lens; and
a light source module, comprising a plurality of light emitting elements arranged in an array;
wherein a total length of the variable focus flashlight module is a constant, and a ratio of a focal length of the second lens to a focal length of the third lens falls within a range of 1.78 to 3.02, both of an object-side surface and an image-side surface of the first lens, the second lens and the third lens are even aspherical surfaces.