US 11,947,243 B2
Auto-focus apparatus for camera
Olli Norja, Tampere (FI); and Eero Sakari Paivansalo, Tampere (FI)
Assigned to Changzhou AAC Raytech Optronics Co., Ltd., Changzhou (CN)
Filed by Changzhou AAC Raytech Optronics Co., Ltd., Changzhou (CN)
Filed on Mar. 24, 2022, as Appl. No. 17/702,827.
Prior Publication US 2023/0305363 A1, Sep. 28, 2023
Int. Cl. G03B 13/36 (2021.01)
CPC G03B 13/36 (2013.01) 14 Claims
OG exemplary drawing
 
1. A auto-focus apparatus for a camera, including:
a first lens;
a second lens spaced from the first lens;
a transparent elastic spacer sandwiched between the first lens and the second lens;
a shape memory alloy wire having a first fixing part connecting with the first lens, a second fixing part connecting with the second lens, and a connecting part connecting the first fixing part to the second fixing part; wherein
the shape memory alloy wire is configured to change a distance between the first lens and the second lens to deform the transparent elastic spacer for performing auto-focus function.