Lens assembly and camera module
Disclosed are a lens assembly and a camera module. The lens assembly includes a lens unit and a spacer provided at an upper portion or a lower portion of the lens unit. The spacer includes polymer having the glass transition temperature of about 140° C. to about 500° C.
1. A lens assembly comprising:
a lens unit; and
a spacer at an upper portion or a lower portion of the lens unit,
wherein the spacer includes polymer having a glass transition temperature of about 140° C. to about 500° C.,
wherein the spacer comprises a frame part and a polymer part,
wherein the frame part comprises a plurality of inorganic fibers and forms a frame of the spacer and the polymer part fills voids among the plurality of inorganic fibers, the polymer part having a heat resistance lower than that of the inorganic fibers;
wherein the lens unit comprises a first lens unit and a second lens unit on the first lens unit,
wherein the first lens unit comprises a first concave surface on a top surface of the first lens unit, and
wherein the second lens unit comprises a second concave surface on a bottom surface of the second lens unit.
2. The lens assembly of claim 1 , wherein the polymer includes polyimide.
3. The lens assembly of claim 1 , wherein the spacer includes a plurality of sheets stacked on each other, and the sheets include polymer.
4. The lens assembly of claim 3 , wherein the sheets include polyimide, and thickness of about 50 μm to about 250 μm.
5. The lens assembly of claim 3 , wherein the sheets include polyether ether ketone, and have a thickness of about 50 μm to about 300 μm.
6. The lens assembly of claim 3 , wherein the sheets include polytetrafluoroethylene and have a thickness of about 50 μm to about 260 μm.
7. The lens assembly of claim 1 , wherein the polymer includes polyether ether ketone.
8. The lens assembly of claim 1 , wherein the polymer includes liquid crystal polymer.
9. The lens assembly of claim 1 , wherein the spacer includes a transmission hole corresponding to the lens unit, and
wherein a top portion of the transmission hole is disposed at a position higher than a top surface of the spacer.
10. The lens assembly of claim 1 , wherein the spacer comprises a first spacer between the first lens unit and the second lens unit,
wherein the first spacer comprises a first transmission hole, and
wherein the first transmission hole is disposed between the first concave surface and the second concave surface.
11. A camera module comprising:
a first lens unit;
a second lens unit on the first lens unit;
a first spacer interposed between the first and second lens units, wherein the first spacer includes polyimide;
a light shielding part on the second lens unit; and
a second spacer below the first lens unit;
wherein the first spacer comprises a first frame part and a first polymer part,
wherein the first frame part comprises a plurality of inorganic fibers and forms a frame of the first spacer and the first polymer part fills voids among the plurality of inorganic fibers, the first polymer part having a heat resistance lower than that of the inorganic fibers; and
wherein a thickness of the second spacer is greater than a thickness of the first spacer.
12. The camera module of claim 11 , wherein lateral surfaces of the first and second lens units and a lateral surface of the first spacer are arranged on a same plane.
13. The camera module of claim 12 , wherein the first and second lens units include transparent polymer, and the first spacer is opaque.
14. The camera module of claim 11 , further comprising
an optical filter below the second spacer; and
a third spacer below the optical filter;
wherein the light shielding part, the second spacer, and the third spacer each includes polyimide; and
wherein the second spacer, the third spacer, and the light shielding part each includes a second frame part and a corresponding second polymer part surrounding the second frame part; and
wherein a thickness of the second spacer is greater than a thickness of the third spacer.
15. A camera module comprising:
a first lens unit;
a second lens unit on the first lens unit;
a spacer interposed between the first and second lens units; and
a light shielding part on the second lens unit;
wherein the spacer comprises a first spacer between the first lens unit and the second lens unit and a second spacer below the first lens unit:
wherein the spacer includes a frame part and a polymer part,
wherein the frame part comprises a plurality of inorganic fibers and forms a frame of the spacer and the polymer part fills voids among the plurality of inorganic fibers, the polymer part having a heat resistance lower than that of the inorganic fibers;
wherein the first lens unit comprises a first concave surface on a top surface of the first lens unit;
wherein the second lens unit comprises a second concave surface on a bottom surface of the second lens unit; and
wherein a thickness of the second spacer is greater than a thickness of the first spacer.
16. The camera module of claim 15 , wherein the spacer includes a plurality of sheets stacked on each other, and each sheet includes the frame part and the polymer part.
17. The lens assembly of claim 15 , wherein the first spacer comprises a first transmission hole.
18. The lens assembly of claim 17 , wherein the first transmission hole is disposed between the first concave surface and the second concave surface.