Rotatable camera module
A camera module includes a lens barrel, an image sensor, a holder and a driving member. The lens barrel and the image sensor are received in the holder. At least one magnet is arranged on the outer wall of the holder. The driving member includes a spherical casing, a plurality of induction coils and a control unit. The casing has an opening for entry of the holder. The plurality of induction coils is mounted on the inner wall of the spherical casing. The control unit is received in the spherical casing. The control unit is electrically connected with the induction coils. The control unit is configured for controlling the electric current through the induction coils to form an electromagnetic field, thus a magnetism is generated between the at least magnet and the electromagnetism.
1. A camera module, comprising:
a lens barrel with a lens received therein;
an image sensor for detecting light;
a spherical holder, the lens barrel and the image sensor received therein, the lens optically coupling with the image sensor, and a magnet arranged on the outer wall of the holder; and
a driving member driving the holder to rotate, the driving member comprising:
a spherical casing, the casing having an opening for entry of the holder;
a plurality of induction coils mounted on the inner wall of the spherical casing; and
a control unit received in the spherical casing and electrically connected with the induction coils, configured for controlling the electric current through the induction coils to form an electromagnetic field, such that magnetism is generated between the magnet and the electromagnetic field.
2. The camera module as claimed in claim 1 , wherein the sphere center of the casing is substantially coincident with the sphere center of the holder.
3. The camera module as claimed in claim 1 , wherein the magnet is a permanent magnet having N and S poles opposite to each other.
4. The camera module as claimed in claim 3 , wherein the magnet is an annular magnet fitted around the outer wall the holder.
5. The camera module as claimed in claim 4 , wherein the center of the annular magnet is substantially coincident with the sphere center of the holder.
6. The camera module as claimed in claim 3 , wherein the magnet is curved, with the N and S poles corresponding to the two distal ends of the curved magnet.
7. The camera module as claimed in claim 6 , wherein the plurality of induction coils comprises a plurality of induction coil couplings, each comprising two adjacent induction coils.
8. The camera module as claimed in claim 7 , wherein the principal axis of each induction coil passes through the sphere center of the casing.
9. The camera module as claimed in claim 8 , wherein an angle between two lines connecting the two distal ends with the sphere center of the holder respectively defines θ 1 , and an angle between the principal axis of the first induction coil and the principal axis of the adjacent, second coil defined as θ 2 , wherein angle θ 1 is larger than angle θ 2 .
10. The camera module as claimed in claim 1 , further comprising a plurality of club-shaped elements protruding from the inner wall of the casing.
11. The camera module as claimed in claim 10 , wherein the club-shaped elements all point at the sphere center of the casing.
12. The camera module as claimed in claim 10 , wherein the club-shaped elements are of a ferromagnetic material.