US 11,754,782 B2
Mechanically held polymer lenses for photonics device maintaining placement reference to die
Joseph Hannan, Helsinki (FI)
Assigned to STMicroelectronics (Research & Development) Limited, Marlow (GB)
Filed by STMicroelectronics (Research & Development) Limited, Marlow (GB)
Filed on May 6, 2021, as Appl. No. 17/313,301.
Prior Publication US 2022/0357507 A1, Nov. 10, 2022
Int. Cl. G02B 6/122 (2006.01); H05K 1/02 (2006.01); G02B 6/12 (2006.01)
CPC G02B 6/122 (2013.01) [H05K 1/0274 (2013.01); G02B 2006/1213 (2013.01); G02B 2006/12102 (2013.01); G02B 2006/12109 (2013.01); H05K 2201/10121 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A photonic device, comprising:
a printed circuit board (PCB) having an integrated circuit mounted thereon; and
a cap mounted to the PCB and carrying a lens positioned over the integrated circuit, the cap comprising:
an outer wall mounted to the PCB, extending upwardly from the PCB, and surrounding at least a portion of the integrated circuit, the outer wall being spaced apart from the lens;
a first retention structure extending inwardly from the outer wall and across the integrated circuit, the first retention structure having a hole defined therein, the hole being surrounded by a support wall that makes physical contact with a bottom face of the lens, the bottom face of the lens facing the PCB; and
a second retention structure having a hole defined in a ceiling thereof that makes physical contact with a top face of the lens, the top face of the lens being opposite the bottom face, the second retention structure being affixed within the first retention structure such that the hole in the second retention structure is axially aligned with the hole in the first retention structure and such that the lens is mechanically constrained within the cap between the support wall of the first retention structure and the ceiling of the second retention structure, with light being transmissible therethrough via the hole defined in the second retention structure, the mechanical constraint of the lens being such to align the lens with the integrated circuit.