US 12,360,445 B2
Focusing module and projection apparatus
Chih-Hui Chang, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Nov. 15, 2022, as Appl. No. 17/986,897.
Claims priority of application No. 202111365815.6 (CN), filed on Nov. 18, 2021.
Prior Publication US 2023/0152676 A1, May 18, 2023
Int. Cl. G03B 21/14 (2006.01); G03B 21/53 (2006.01)
CPC G03B 21/142 (2013.01) [G03B 21/145 (2013.01); G03B 21/53 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A focusing module, adapted for a projection lens with an optical axis, and the focusing module comprising a focusing ring and a projection lens mounting ring, wherein
the focusing ring has a first ring body and a first annular wall, the first ring body has a first opening and a second opening opposite to each other, the first annular wall is connected to the first ring body and surrounds the first opening, the first annular wall has a limiting hole, an inner annular surface and an outer annular surface, the inner annular surface is opposite to the outer annular surface, and the limiting hole penetrates the inner annular surface and the outer annular surface of the first annular wall along a direction perpendicular to the optical axis; and
the projection lens mounting ring has a second annular wall adapted to be fixed to the projection lens along the optical axis, the second annular wall is disposed on an inner side of the first annular wall and is adapted to rotate relative to the first annular wall along a circumferential direction of the first annular wall, the second annular wall has a through hole and a rotation buffer structure, the rotation buffer structure is located in the through hole and has a limiting portion and a cantilever portion, the cantilever portion is connected between the limiting portion and a hole edge of the through hole, the limiting portion has a center surrounded by the hole edge, the center protrudes toward a direction facing the first annular wall of the focusing ring and has a first side and a second side opposite to each other in the circumferential direction, and a thickness of the limiting portion gradually decreases from the center toward the first side and the second side in a radial direction of the second annular wall;
wherein the center of the limiting portion is located in the limiting hole and the first annular wall is pressed against the first side and the second side when the limiting portion of the rotation buffer structure contacts against the limiting hole of the focusing ring.