US 12,271,021 B2
Luminous keyboard and optical module thereof
Chao-Yu Chen, Taoyuan (TW)
Assigned to DARFON ELECTRONICS CORP., Taoyuan (TW)
Filed by Darfon Electronics Corp., Taoyuan (TW)
Filed on Nov. 3, 2022, as Appl. No. 18/052,233.
Claims priority of application No. 110141391 (TW), filed on Nov. 5, 2021.
Prior Publication US 2023/0143245 A1, May 11, 2023
Int. Cl. F21V 8/00 (2006.01)
CPC G02B 6/006 (2013.01) 17 Claims
OG exemplary drawing
 
1. An optical module for a luminous keyboard comprising a plurality of keyswitches, the optical module comprising:
a mask film having a mask pattern, the mask pattern defining a plurality of light-transparent regions respectively corresponding to the plurality of keyswitches, an outer light-transparent region of the plurality of light-transparent regions having a region boundary;
a patterned layer disposed on the mask film, the patterned layer having a light transmittance larger than a light transmittance of the mask pattern; and
a light guide sheet on one side of the mask film, the light guide sheet having a light-exit edge, on the mask film a vertical projection of the light-exit edge of the light guide sheet at least partially falling within the outer light-transparent region,
wherein the patterned layer is at least partially located in the outer light-transparent region adjacent to the region boundary,
wherein the light guide sheet has a hole, and on the mask film a vertical projection of the hole falls in the outer light-transparent region.