US 11,940,646 B2
Keyswitch backlight structure and illuminated keyswitch structure therewith
Shih-Yung Ku, Taoyuan (TW); and Hsin-Cheng Ho, Taoyuan (TW)
Assigned to DARFON ELECTRONICS CORP., Taoyuan (TW)
Filed by DARFON ELECTRONICS CORP., Taoyuan (TW)
Filed on Apr. 14, 2023, as Appl. No. 18/134,575.
Claims priority of application No. 111115889 (TW), filed on Apr. 26, 2022.
Prior Publication US 2023/0341607 A1, Oct. 26, 2023
Int. Cl. F21V 8/00 (2006.01); G02B 1/11 (2015.01); G06F 1/16 (2006.01); G06F 3/02 (2006.01); H01H 13/02 (2006.01); H01H 13/14 (2006.01); H01H 13/704 (2006.01); H01H 13/7057 (2006.01); H01H 13/7065 (2006.01)
CPC G02B 6/0043 (2013.01) [G02B 1/11 (2013.01); G02B 6/0036 (2013.01); G02B 6/0055 (2013.01); G02B 6/0088 (2013.01); G06F 3/0202 (2013.01); H01H 13/023 (2013.01); H01H 13/14 (2013.01); H01H 13/704 (2013.01); H01H 13/7057 (2013.01); H01H 13/7065 (2013.01); G06F 1/1616 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A keyswitch backlight structure, comprising:
a light-guiding layer, the light-guiding layer having a bottom surface, a light-emitting surface opposite to the bottom surface, and a surface microstructure formed on the light-emitting surface;
a reflective layer, disposed under the light-guiding layer opposite to the bottom surface; and
a transparent adhesive layer, closely attached to and between the reflective layer and the light-guiding layer corresponding to the surface microstructure;
wherein a low reflective layer is formed corresponding to the surface microstructure on a surface of the reflective layer facing the light-guiding layer, and a reflectance of the low reflective layer is lower than a reflectance of the reflective layer.