US Patent 11947243 Auto-focus apparatus for camera

The invention provides an auto-focus apparatus for a camera. The auto-focus apparatus includes a first lens; a second lens spaced from the first lens; a transparent elastic spacer sandwiched between the first lens and the second lens; and 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. The shape memory alloy wire can change the distance and deform the transparent elastic spacer between the first and second lenses for performing auto-focus function.