Lens assembly
A lens assembly is provided. The lens assembly includes a lens barrel, at least two lenses arranged inside the lens barrel along an optical axis direction, and a spacer provided between the at least two lenses, wherein the spacer includes a first alignment portion and a second alignment portion seated in respective protrusions or recesses provided on a rib of the first lens and a rib of the second lens.
1 . A lens assembly, comprising:
a lens barrel;
a first lens and a second lens disposed inside the lens barrel along an optical axis direction, the first lens comprising a rib having a protrusion and the second lens comprising a rib having a recess; and
a spacer disposed between the first lens and the second lens;
wherein the spacer comprises:
a plurality of first alignment portions disposed on a first surface of the spacer facing the first lens, each first alignment portion having a recess shape recessed toward the second lens,
a plurality of second alignment portions disposed on a second surface of the spacer facing the second lens, each second alignment portion having a protrusion shape protruding toward the second lens,
wherein the protrusion of the rib of the first lens is received in a corresponding one of the first alignment portions, and the recess of the rib of the second lens receives a corresponding one of the second alignment portions,
wherein the first lens comprises a single D-cut portion defined by cutting away a portion of the rib at one circumferential side of the first lens, and
wherein the plurality of first alignment portions and the plurality of second alignment portions are arranged in a circumferential direction with reference to the D-cut portion.
2 . The lens assembly of claim 1 , wherein the rib of the first lens and the rib of the second lens are disposed on opposite surfaces of the spacer.
3 . The lens assembly of claim 1 , wherein at least a portion of the first alignment portion and a portion of the second alignment portion overlap each other in the optical axis direction.
4 . The lens assembly of claim 1 , wherein the first alignment portion and the second alignment portion do not overlap each other in the optical axis direction.
5 . The lens assembly of claim 1 , wherein the plurality of first alignment portions and the plurality of second alignment portions are disposed at equal intervals in the circumferential direction.
6 . The lens assembly of claim 1 , wherein four first alignment portions and four second alignment portions are provided on the spacer.
7 . The lens assembly of claim 1 , wherein the first alignment portion and the second alignment portions each have a round shape.
8 . The lens assembly of claim 1 , wherein the first alignment portion and the second alignment portions each have a spherical surface shape.
9 . A lens assembly, comprising:
a first lens, a spacer, and a second lens sequentially stacked in an optical axis direction in a lens barrel;
a recess-shaped first alignment portion provided in a first rib in which the first lens faces the spacer;
a protrusion-shaped second alignment portion disposed on a first surface of the spacer facing the first rib and received in the first alignment portion;
a recess-shaped third alignment portion disposed on a second surface of the spacer opposite the first surface; and
a protrusion-shaped fourth alignment portion disposed on a second rib of the second lens facing the spacer and received in the third alignment portion,
wherein the first alignment portion receives the second alignment portion, and the third alignment portion receives the fourth alignment portion,
wherein the first lens comprises a single D-cut portion defined by cutting away a portion of the first rib at one circumferential side of the first lens, and
wherein the first to fourth alignment portions are arranged in a circumferential direction with reference to the D-cut portion.
10 . The lens assembly of claim 9 , wherein
the first alignment portion, the second alignment portion, the third alignment portion, and the fourth alignment portion are provided to overlap each other in the optical axis direction.
11 . The lens assembly of claim 9 , wherein
edges of recesses or protrusions that form the first alignment portion, the second alignment portion, the third alignment portion, and the fourth alignment portion have a same shape.
12 . A lens assembly, comprising:
a lens barrel;
a first lens and a second lens disposed inside the lens barrel along an optical axis direction; and
a spacer disposed between the first lens and the second lens,
wherein a rib of the first lens comprises a plurality of first protrusions, and the spacer comprises a plurality of first recesses receiving the plurality of first protrusions,
wherein a rib of the second lens comprises a plurality of second recesses, and the spacer comprises a plurality of second protrusions received in the plurality of second recesses,
wherein the first lens comprises a single D-cut portion defined by cutting away a portion of the rib at one circumferential side of the first lens, and
wherein the plurality of first protrusions and the plurality of second recesses are arranged in a circumferential direction with reference to the D-cut portion.
13 . The lens assembly of claim 12 , wherein the first protrusion of the rib of the first lens and the second recess of the rib of the second lens overlap each other in an optical axis direction.
14 . The lens assembly of claim 12 , wherein the first protrusion of the rib of the first lens and the second recess of the rib of the second lens partially overlap each other in an optical axis direction.
15 . The lens assembly of claim 12 , wherein the first protrusion of the rib of the first lens and the second recess of the rib of the second lens do not overlap each other in an optical axis direction.