US 12,455,410 B2
Ring-shaped light guide module and light emitting device
Ming-Hui Yeh, Taipei (TW); Ruey-Piin Wang, Taipei (TW); Yin-Liang Hu, Taipei (TW); Chia-Ming Li, Taipei (TW); Ming-Han Yu, Taipei (TW); and Wei-Ping Chan, Taipei (TW)
Assigned to Primax Electronics Ltd., Taipei (TW)
Filed by Primax Electronics Ltd., Taipei (TW)
Filed on Jun. 30, 2023, as Appl. No. 18/217,321.
Claims priority of application No. 112119981 (TW), filed on May 29, 2023.
Prior Publication US 2024/0402409 A1, Dec. 5, 2024
Int. Cl. F21V 8/00 (2006.01); G02B 6/00 (2006.01)
CPC G02B 6/0021 (2013.01) [G02B 6/0041 (2013.01); G02B 6/0055 (2013.01); G02B 6/0058 (2013.01); G02B 6/0083 (2013.01); G02B 6/0088 (2013.01); G02B 6/0093 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A ring-shaped light guide module, comprising:
a ring-shaped light guide plate having a plurality of accommodating recesses disposed on an outer ring surface of the ring-shaped light guide plate and separated from each other, wherein a thickness of the ring-shaped light guide plate decreases from a first side of the ring-shaped light guide plate to a second side thereof, and the second side is a light-exiting side;
a circuit board surrounding a portion of the outer ring surface of the ring-shaped light guide plate;
a plurality of top light-emitting elements disposed on the circuit board and respectively located in the accommodating recesses; and
a reflective layer covering a portion of an inner ring surface and a first side surface of the ring-shaped light guide plate.