LENS MODULE
A lens module include a first lens, a second lens, and a distance maintenance member disposed between the first lens and the second lens, the distance maintenance member having a hole for adjusting an amount of light. An inner circumferential surface of the hole includes a plurality of inclined surfaces that are respectively inclined at predetermined angles with respect to an optical axis.
1 . A lens module comprising:
a first lens;
a second lens; and
a distance maintenance member disposed between the first lens and the second lens, the distance maintenance member having a hole for adjusting an amount of light,
wherein an inner circumferential surface of the hole comprises a plurality of inclined surfaces that are respectively inclined at predetermined angles with respect to an optical axis.
2 . The lens module of claim 1 , wherein the plurality of inclined surfaces are discontinuously disposed with regard to one another.
3 . The lens module of claim 1 , wherein the plurality of inclined surfaces comprise:
a first inclined surface having a first inclined angle; and
a second inclined surface having a second inclined angle.
4 . The lens module of claim 3 , wherein the first and second inclined angles are different from each other.
5 . The lens module of claim 1 , further comprising a lens barrel that accommodates the first lens and the second lens.
6 . The lens module of claim 5 , wherein the lens barrel is formed of a material having the same linear expansion coefficient as those of the first and second lenses.
7 . The lens module of claim 6 , wherein each of the first and second lenses is formed of a plastic material, and the lens barrel is formed of polyarylate (PAR).
8 . The lens module of claim 1 , wherein the distance maintenance member is formed of a nonferrous metal.
9 . A lens module comprising:
a first lens;
a second lens; and
a first distance maintenance member disposed between the first lens and the second lens, the first distance maintenance member having a first hole for adjusting an amount of light; and
a second distance maintenance member disposed between the first lens and the second lens, the second distance maintenance member having a second hole for adjusting an amount of light,
wherein an inner circumferential surface of the first hole comprises a first inclined surface having a first inclined angle with respect to an optical axis, and
an inner circumferential surface of the second hole comprises a second inclined surface having a second inclined angle with respect to the optical axis.
10 . The lens module of claim 9 , wherein the first and second inclined angles are different from each other.
11 . The lens module of claim 9 , wherein the first and second holes are different in size.
12 . The lens module of claim 9 , further comprising a lens barrel that accommodates the first lens and the second lens.
13 . The lens module of claim 12 , wherein the lens barrel is formed of a material having the same linear expansion coefficient as those of the first and second lenses.
14 . The lens module of claim 13 , wherein each of the first and second lenses is formed of a plastic material, and
the lens barrel is formed of polyarylate (PAR).
15 . The lens module of claim 9 , wherein each of the first and second distance maintenance members is formed of a nonferrous metal.
16 . A lens module comprising:
a lens barrel;
a first lens group coupled to the lens barrel;
a second lens group coupled to the first lens group without in contact with the lens barrel; and
a third lens group coupled to the second lens group.
17 . The lens module of claim 16 , wherein the third lens group is in contact with the lens barrel.
18 . The lens module of claim 16 , wherein an inclined surface is disposed on an outer circumferential surface of the third lens group.
19 . The lens module of claim 16 , wherein the second lens group comprises a plurality of lenses.
20 . The lens module of claim 16 , further comprising a distance maintenance member disposed between the second lens group and the third lens group and having a hole for adjusting an amount of light.
21 . The lens module of claim 20 , wherein the distance maintenance member is formed of a nonferrous metal.
22 . The lens module of claim 20 , wherein an inner circumferential surface of the hole comprises a plurality of inclined surfaces, each having a predetermined angle with respect to an optical axis.
23 . The lens module of claim 22 , wherein the plurality of inclined surfaces comprise:
a first inclined surface having a first inclined angle; and
a second inclined surface having a second inclined angle.
24 . The lens module of claim 23 , wherein the first and second inclined angles are different from each other.
25 . The lens module of claim 16 , wherein the lens barrel is formed of a material having the same linear expansion coefficient as those of the first to third lens groups.
26 . The lens module of claim 25 , wherein each of the first to third lenses is formed of a plastic material, and
the lens barrel is formed of polyarylate (PAR).
27 . The lens module of claim 16 , further comprising:
a first distance maintenance member disposed between the second lens group and the third lens group, the first distance maintenance member having a first hole for adjusting an amount of light; and
a second distance maintenance member disposed between the second lens group and the third lens group, the second distance maintenance member having a second hole for adjusting the amount of light.
28 . The lens module of claim 27 , wherein each of the first and second distance maintenance members is formed of a nonferrous metal.
29 . The lens module of claim 27 , wherein an inner circumferential surface of the first hole comprises a first inclined surface having a first inclined angle with respect to an optical axis, and
an inner circumferential surface of the second hole comprises a second inclined surface having a second inclined angle with respect to the optical axis.
30 . The lens module of claim 29 , wherein the first and second inclined angles are different from each other.
31 . The lens module of claim 29 , wherein the first and second holes are different in size.