Lens module, camera module, and method of manufacturing camera module

1. A lens module comprising:

a lens unit including a lens, by which light incident from outside is condensed and caused to outgo, and a barrel, which receives therein the lens;

a barrel holding part, with which the lens unit engages threadedly, and to which the lens unit is fixed by an adhesive;

a pedestal mount including a barrel receiving portion, which receives therein the barrel holding part in a state of being slidable in a circumferential direction and movable in an optical axis direction of the lens, and an image pickup device receiving portion, which receives therein an image pickup device, which receives light outgoing from the lens to convert the same into an electric signal to output the same;

an elastic member, which pushes the barrel holding part in a manner to maintain the same in a state of being received in the barrel receiving portion of the pedestal mount; and

an interposing member, which is fitted onto the pedestal mount, and between which and the barrel holding part the elastic member is interposed,

wherein the interposing member is formed with a notch, through which an adhesive is injected onto threaded portions of the lens unit and the barrel holding part.

2. The lens module according to claim 1 , wherein an opening portion of those female threads of the barrel holding part, with which the lens unit engages threadedly, is tapered.

3. The lens module according to claim 1 , wherein the elastic member is arranged in contact with an outer edge of an upper end surface of the barrel holding part, and

the notch is formed in a position on the interposing member, which position is away from a position, in which the interposing member interposes the elastic member.

4. The lens module according to claim 1 , wherein the pedestal mount receives therein the barrel holding part contacting in plural lines with an inner wall surface of the receiving portion of the pedestal mount.

5. The lens module according to claim 4 , wherein intervals of those lines, at which the inner wall surface of the receiving portion of the pedestal mount contacts with the barrel holding part, are determined on the basis of a diameter of a virtual inscribing circle defined by connecting the plural contacting lines, an outside diameter of the barrel holding part, and an amount of offset being permissible for an optical axis of the lens.

6. The lens module according to claim 4 , wherein the pedestal mount is formed on the inner wall surface of the receiving portion of the pedestal mount with a plurality of projections and receives therein the barrel holding part with the projections contacting therewith.

7. The lens module according to claim 4 , wherein the receiving portion of the pedestal mount includes a polygonal-shaped inner wall surface.

8. The lens module according to claim 1 , wherein the pedestal mount receives therein the barrel holding part in a state of being slidable in contact with a plurality of projections formed on an inner wall surface of the receiving portion.

9. The lens module according to claim 8 , further comprising:

movement means, which moves the barrel holding part in the optical axis direction of the lens;

wherein the movement means comprises a recess or a projection formed on a lower end surface of the barrel holding part to contact with an inner bottom surface of the receiving portion of the pedestal mount; and

a projection or a recess formed on the inner bottom surface of the receiving portion of the pedestal mount to correspond to the recess or the projection on the lower end surface of the barrel holding part;

wherein when the barrel holding part is rotated to cause the recess or the projection on the barrel holding part to engage with the projection or the recess on the pedestal mount, the barrel holding part is moved to a first position in the optical axis direction of the lens, and

when the barrel holding part is rotated to cause the recess or the projection on the barrel holding part not to engage with the projection or the recess on the pedestal mount, the barrel holding part is moved to a second position in the optical axis direction of the lens.

10. The lens module according to claim 8 , further comprising:

a lever connected to the barrel holding part;

wherein two stoppers, which restricts a range of movement of the lever of the barrel holding part, are formed at a predetermined interval on the pedestal mount;

when the lever abuts against either of the stoppers, the barrel holding part is held in either of the first and second positions in the optical axis direction.

11. The lens module according to claim 8 , wherein an annular recess, into which a lower end surface of the barrel holding part enters, is formed on an inner bottom surface of the receiving portion of the pedestal mount, and

in a state, in which the lower end surface of the barrel holding part enters into the annular recess of the pedestal mount, a clearance between an inner wall surface of the barrel holding part and an inner peripheral side wall surface of the annular recess is smaller than a small piece generated by sliding of the barrel holding part in the receiving portion of the pedestal mount.

12. A camera module comprising:

a lens unit including a lens, by which light incident from outside is condensed and caused to outgo, and a barrel, which receives therein the lens;

a barrel holding part, with which the lens unit engages threadedly, and to which the lens unit is fixed by an adhesive;

an image pickup device, which receives light outgoing from the lens to convert the same into an electric signal to output the same;

a pedestal mount including a barrel receiving portion, which receives therein the barrel holding part in a state of being slidable in a circumferential direction and movable in an optical axis direction of the lens, and an image pickup device receiving portion, which receives therein the image pickup device;

an elastic member, which pushes the barrel holding part to maintain the same in a state of being received in the barrel receiving portion of the pedestal mount; and

an interposing member, which is fitted onto the pedestal mount, and between which and the barrel holding part the elastic member is interposed,

wherein the interposing member is formed with a notch, through which an adhesive is injected onto threaded portions of the lens unit and the barrel holding part.

13. The camera module according to claim 12 , comprising a pedestal mount, which receives therein the barrel holding part in a state of being slidable in contact with a plurality of projections formed on an inner wall surface of the receiving portion.

14. A method of manufacturing a camera module, the method comprising the steps of:

threadedly engaging a lens unit including a lens, by which light incident from outside is condensed and caused to outgo, and a barrel, which receives therein the lens, with a barrel holding part;

receiving the barrel holding part, with which the lens unit engages threadedly, in a barrel receiving portion of a pedestal mount, in a state, in which the barrel holding part is slidable in a circumferential direction and movable in an optical axis direction of the lens;

arranging an elastic member in the barrel holding part received in the barrel receiving portion of the pedestal mount;

fitting an interposing member onto the pedestal mount and interposing the elastic member between the interposing member and the barrel holding part;

receiving an image pickup device, which receives light outgoing from the lens to convert the same into an electric signal to output the same, in an image pickup device receiving portion of the pedestal mount;

regulating threading of the lens unit in the barrel holding part so that light outgoing from the lens forms an image in a light receiving area of the image pickup device; and

injecting an adhesive onto threaded portions of the lens unit and the barrel holding part through a notch formed on the interposing member.