US 12,204,135 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. 1, 2024, as Appl. No. 18/592,794.
Application 18/592,794 is a continuation of application No. 18/192,848, filed on Mar. 30, 2023, granted, now 11,947,150.
Claims priority of provisional application 63/325,623, filed on Mar. 31, 2022.
Claims priority of provisional application 63/368,272, filed on Jul. 13, 2022.
Claims priority of application No. 112108773 (TW), filed on Mar. 9, 2023.
Prior Publication US 2024/0201430 A1, Jun. 20, 2024
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. An illuminated keyswitch structure, comprising:
a baseplate having at least one bridge rib configured to define at least one peripheral hole;
a mask film disposed below the baseplate to allow partial light output;
a light guide sheet disposed on one side of the mask film opposite to the baseplate, the light guide sheet having a plurality of light-exit portions disposed corresponding to the at least one peripheral hole and at least one non-light-exit portion corresponding to the at least one bridge rib;
a reflective layer disposed on one side of the light guide sheet opposite to the mask film, the reflective layer provided with microstructures,
wherein in a stacked direction of the baseplate, the mask film, the light guide sheet, and the reflective layer, a first portion of the microstructures are disposed on the reflective layer to overlap the at least one non-light-exit portion of the light guide plate and overlap the at least one bridge rib of the baseplate.