US 11,947,150 B2
Backlit module and illuminated keyswitch structure
Heng-Yi Huang, Taoyuan (TW); Hsin-Cheng Ho, Taoyuan (TW); and Po-Yueh Chou, Taoyuan (TW)
Assigned to DARFON ELECTRONICS CORP., Taoyuan (TW)
Filed by Darfon Electronics Corp., Taoyuan (TW)
Filed on Mar. 30, 2023, as Appl. No. 18/192,848.
Claims priority of provisional application 63/368,272, filed on Jul. 13, 2022.
Claims priority of provisional application 63/325,623, filed on Mar. 31, 2022.
Claims priority of application No. 112108773 (TW), filed on Mar. 9, 2023.
Prior Publication US 2023/0314690 A1, Oct. 5, 2023
Int. Cl. F21V 8/00 (2006.01); H01H 13/705 (2006.01); H01H 13/83 (2006.01)
CPC G02B 6/0035 (2013.01) [G02B 6/0055 (2013.01); H01H 13/705 (2013.01); H01H 13/83 (2013.01); G02B 6/006 (2013.01); H01H 2219/062 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A backlit module, comprising:
a mask film having a first coating configured to substantially reflect a light;
a light guide sheet disposed at one side of the mask film, the light guide sheet having a light source hole;
a reflective layer disposed at one side of the light guide sheet opposite to the mask film, the reflective layer having an opening communicating with the light source hole;
a top glue configured to connect the mask film and the light guide sheet and located around the light source hole; and
a bottom glue configured to connect the light guide sheet and the reflective layer and located around the light source hole,
wherein the first coating covers the light source hole, and in a stacked direction of the mask film, the light guide sheet, and the reflective layer, at least one of the top glue and the bottom glue overlaps the first coating.