US 11,867,887 B2
Light-folding element for camera module, camera module and electronic device
Min-Chun Liao, Taichung (TW); Lin An Chang, Taichung (TW); Ming-Ta Chou, Taichung (TW); Jyun-Jia Cheng, Taichung (TW); Cheng-Feng Lin, Taichung (TW); and Ming-Shun Chang, Taichung (TW)
Assigned to LARGAN PRECISION CO., LTD., Taichung (TW)
Filed by LARGAN PRECISION CO., LTD., Taichung (TW)
Filed on Jun. 25, 2021, as Appl. No. 17/359,168.
Claims priority of provisional application 63/130,140, filed on Dec. 23, 2020.
Prior Publication US 2022/0196993 A1, Jun. 23, 2022
Int. Cl. G02B 13/00 (2006.01); G03B 17/17 (2021.01); G02B 5/22 (2006.01); G02B 23/08 (2006.01)
CPC G02B 13/0065 (2013.01) [G02B 5/22 (2013.01); G02B 23/08 (2013.01); G03B 17/17 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A light-folding element for a camera module, the light-folding element comprising:
an object-side surface, wherein an imaging light travelling into the camera module enters the object-side surface;
an image-side surface, wherein the imaging light exits through the image-side surface;
at least one reflection surface, configured to reflect the imaging light passing through the object-side surface and send the imaging light to the image-side surface; and
at least one connection surface, connected to the object-side surface, the image-side surface and the at least one reflection surface;
wherein the light-folding element has at least one recessed structure located at the at least one connection surface, the at least one recessed structure is recessed from the at least one connection surface towards an interior of the light-folding element, and the at least one recessed structure comprises a top end portion, a bottom end portion and a tapered portion at the at least one connection surface;
wherein the top end portion is located at an edge of the at least one connection surface, the bottom end portion is located opposite to the top end portion, the tapered portion is connected to and located between the top end portion and the bottom end portion, the tapered portion has two tapered edges located on the at least one connection surface, the two tapered edges are connected to the top end portion and the bottom end portion, and a width of the tapered portion decreases in a direction from the top end portion towards the bottom end portion;
wherein the at least one connection surface includes two connection surfaces, the two connection surfaces are disposed opposite to each other, the at least one recessed structure includes a plurality of recessed structures, two of the plurality of recessed structures are respectively located on the two connection surfaces, the two of the plurality of recessed structures are connected to each other, and a groove is formed between the two of the plurality of recessed structures;
wherein a depth of the groove is Dg, a distance between the top end portion and the bottom end portion of each of the two of the plurality of recessed structures is D, and the following condition is satisfied:
Dg/D≤0.716.