Lens driving apparatus
View Patent ↗A lens driving apparatus includes a lens holding member, a static member including a housing, a biasing member, and a moving mechanism. The biasing member includes upper and lower leaf springs. The upper leaf spring includes an upper first portion, an upper second portion, and an upper elastic arm portion. A through hole is formed in the upper first portion of the upper leaf spring. The lens holding member includes a fastening portion that includes a mount surface on which the upper leaf spring is placed, a recess facing the through hole, and a protrusion inserted into the through hole. An adhesive held in the recess surrounds the protrusion and part of the adhesive spreads to an upper surface of the upper first portion of the upper leaf spring through the through hole. The upper leaf spring is fixed to the lens holding member with the adhesive.
1. A lens driving apparatus, comprising:
a tubular lens holding member capable of holding a lens body;
a fixed member including a housing that accommodates the lens holding member therein;
a biasing member that movably supports the lens holding member such that the lens holding member moves in an optical axis direction, the biasing member including:
an upper leaf spring, including:
a first portion having a through hole and fixed to an upper portion of the lens holding member;
a second portion fixed to the fixed member; and
an elastic arm portion provided between the first portion and the second portion; and
a lower leaf spring fixed to a lower portion of the lens holding member; and
a moving mechanism configured to move the lens holding member in the optical axis direction, the moving mechanism including at least a magnet and a coil,
wherein the lens holding member includes:
a fastening portion having:
a mount surface on which the upper leaf spring is placed;
an adhesive holding portion that faces the through hole of the first portion of the upper leaf spring, the adhesive holding portion including a recess that is recessed from the mount surface;
a protrusion that protrudes from the adhesive holding portion and is inserted into the through hole; and
an adhesive held in the adhesive holding portion so as to fill the recess and surround the protrusion, part of the adhesive spreading through the through hole so as to cover an upper surface of the first portion, the adhesive being disposed over and under a portion of the first portion, thereby fixing the upper leaf spring to the lens holding member.
2. The lens driving apparatus according to claim 1 , wherein the through hole has a noncircular shape.
3. The lens driving apparatus according to claim 1 , wherein the lens holding member further includes:
a rising base portion having the fastening portion, and wherein a boundary between the first portion and the elastic arm portion of the upper leaf spring is located at a position corresponding to an outer periphery of the base portion.
4. The lens driving apparatus according to claim 1 , wherein the protrusion protrudes from a bottom of the recess.
5. The lens driving apparatus according to claim 4 , wherein the through hole has a noncircular shape.
6. The lens driving apparatus according to claim 4 , wherein the lens holding member further includes:
a rising base portion having the fastening portion, and wherein a boundary between the first portion and the elastic arm portion of the upper leaf spring is located at a position corresponding to an outer periphery of the base portion.
7. The lens driving apparatus according to claim 4 , wherein:
the recess includes an extension portion that extends toward the elastic arm portion;
the through hole includes a fringe portion that faces the extension portion; and
the adhesive filling the extension portion is disposed over and under a portion of the first portion extending along the fringe portion.
8. The lens driving apparatus according to claim 6 wherein:
the recess includes an extension portion that extends toward the elastic arm portion;
the through hole includes a fringe portion that faces the extension portion; and
the adhesive filling the extension portion is disposed over and under a portion of the first portion extending along the fringe portion.
9. The lens driving apparatus according to claim 5 , wherein, in an initial state of the lens driving apparatus in which no electrical current passes through the coil, the upper leaf spring biases the lens holding member upward while the lower leaf spring biases the lens holding member downward.
10. The lens driving apparatus according to claim 7 , wherein, in an initial state of the lens driving apparatus in which no electrical current passes through the coil, the upper leaf spring biases the lens holding member upward while the lower leaf spring biases the lens holding member downward.
11. The lens driving apparatus according to claim 8 , wherein, in an initial state of the lens driving apparatus in which no electrical current passes through the coil, the upper leaf spring biases the lens holding member upward while the lower leaf spring biases the lens holding member downward.
12. The lens driving apparatus according to claim 1 , wherein a fringe portion of the through hole does not touch the protrusion.