Lens driving device, camera device, electronic apparatus, and manufacturing method for lens driving device
A lens driving device including: a lens holder; a coil mounted on the lens holder; at least one magnet disposed around the coil; a first and second spring members which support the lens holder at the both sides thereof in the optical axis direction so that the lens holder can move freely in the both directions of the optical axis of the lens in an initial state of no electric current to the coil; and an abutment surface to which the lens holder abuts when the lens holder moves toward one spring member against a biasing force of the one spring member; wherein the lens holder is exhorted a biasing force by the other spring member from the side of the other spring member to the side of the one spring member in the optical axis direction when the lens holder abuts against the abutment surface. Thus the lens driving device can support a lens holder in a stable fashion.
1. A lens driving device comprising:
a lens holder for supporting a lens;
a coil mounted on the lens holder;
at least one magnet disposed around the coil;
a first spring member and a second spring member which support the lens holder at the both sides of the lens holder in the optical axis direction of the lens so that the lens holder moves freely in the both directions of the optical axis of the lens in an initial state in which no electric current flows through the coil; and
an abutment surface to which the lens holder abuts when the lens holder moves toward the first spring member against a biasing force of the first spring member; wherein
the lens holder is exhorted a biasing force by the second spring member from the side of the second spring member to the side of the first spring member in the optical axis direction when the lens holder abuts against the abutment surface.
2. The lens driving device according to claim 1 , wherein
each of the first spring member and the second spring member includes: a spring body portion to be fixed on a peripheral portion around the lens holder; a support portion to be fixed to the lens holder; and a connecting portion connecting the spring body portion with the support portion;
the difference of the distance in the optical axis direction from the spring body portion to the support portion of the second spring member and the distance in the optical axis direction from the abutment surface to the lens holder in the initial state in which no electric current flows through the coil is larger than the distance in the optical axis direction from the spring body portion to the support portion of the second spring member in a non-biased state.
3. The lens driving device according to claim 2 , wherein
the spring body portion and the support portion of the second spring member is positioned on the same plane in the non-biased state,
the distance in the optical axis direction between the lens holder and the abutment surface is smaller than the distance in the optical axis direction between the spring body portion and the support portion in the initial state in which no electric current flows through the coil.
4. The lens driving device according to claim 1 , wherein
each of the first spring member and the second spring member includes: a spring body portion to be fixed on a peripheral portion around the lens holder; a support member to be fixed to the lens holder; and a connecting portion connecting the spring body portion with the support portion;
the distance in the optical axis direction from the spring body portion to the support portion of the second spring member in the state in which the lens holder abuts against the abutment surface is larger than the distance in the optical axis direction from the spring body portion to the support portion of the second spring member in a non-biased state.
5. The lens driving device according to claim 4 , wherein
the spring body portion and the support portion of the second spring member is positioned on the same plane in the non-biased state while the support portion is positioned at a side being directed toward the second spring member in the optical axis direction with regard to the spring body portion in the state in which the lens holder abuts against the abutment surface.
6. A camera device comprising:
a lens driving device;
a lens held by a lens holder; and
an image sensor being provided about the optical axis of the lens; wherein
the lens driving device includes:
the lens holder for supporting the lens;
a coil mounted on the lens holder;
at least one magnet disposed around the coil;
a first spring member and a second spring member which support the lens holder at the both sides of the lens holder in the optical axis direction of the lens so that the lens holder moves freely in the both directions of the optical axis of the lens in an initial state in which no electric current flows through the coil; and
an abutment surface to which the lens holder abuts when the lens holder moves toward the first spring member against a biasing force of the first spring member; wherein
the lens holder is exhorted a biasing force by the second spring member from the side of the second spring member to the side of the first spring member in the optical axis direction when the lens holder abuts against the abutment surface.
7. An electronic apparatus being equipped with a camera device, the camera device including:
a lens driving device;
a lens held by a lens holder; and
an image sensor being provided about the optical axis of the lens; wherein
the lens driving device further includes:
the lens holder for supporting the lens;
a coil mounted on the lens holder;
at least one magnet disposed around the coil;
a first spring member and a second spring member which support the lens holder at the both sides of the lens holder in the optical axis direction of the lens so that the lens holder moves freely in the optical axis direction of the lens in an initial state in which no electric current flows through the coil; and
an abutment surface to which the lens holder abuts when the lens holder moves toward the first spring member against a biasing force of the first spring member; wherein
the lens holder is exhorted a biasing force by the second spring member from the side of the second spring member to the side of the first spring member in the optical axis direction when the lens holder abuts against the abutment surface.
8. A method for manufacturing a lens driving device, the method comprising:
fixing a first spring member which supports a lens holder, which holds a lens, at one side of the lens holder in the optical axis direction of the lens;
making the lens holder abut to an abutment surface against a biasing force of the first spring member; and
in the state in which the lens holder abuts to the abutment surface against the biasing force of the first spring member, fixing a second spring member, which supports the lens holder at the other side of the lens holder in the optical axis direction of the lens, to the lens holder with the second spring member being exhorted a biasing force from the other side of the lens holder.
9. The method according to claim 8 , wherein
the lens driving device includes:
a coil mounted on the lens holder; and
at least one magnet disposed around the coil;
the lens holder abuts against the abutment surface by flowing an electric current through the coil.
10. The method according to claim 8 , wherein the abutment of the lens holder against the abutment surface is carried out by pressing the lens holder.