Optical system comprising seven lenses and camera module comprising the same
An optical system disclosed to an embodiment of the invention includes first to seventh lenses sequentially arranged along the optical axis from an object side to an image side, wherein the first lens has positive refractive power and has a meniscus shape convex toward the object side, wherein the second lens may have positive refractive power, an object-side surface of the second lens may be convex, and the second lens may satisfy [Equation 1] 1<f2/F<1.4 (F in Equation 1) means an effective focal length of the optical system, and f2 means a focal length of the second lens).
1 . An optical system comprising:
first to seventh lenses sequentially arranged along an optical axis from an object side to an image side,
wherein the first lens has a positive refractive power and has a meniscus shape convex toward the object side,
wherein the second lens has a positive refractive power,
wherein an object-side surface of the second lens is convex,
wherein an image-side surface of the fourth lens is convex,
wherein an object-side surface of the fifth lens is concave,
wherein the second lens satisfies the following Equation 1:
1< f 2/ F< 1.4 [Equation 1]
(In Equation 1, F means an effective focal length of the optical system, and f2 means a focal length of the second lens),
wherein a center thickness of the sixth lens is L6_CT, and a center thickness of the seventh lens is L7_CT, and
wherein the sixth and seventh lenses satisfy Equation below:
1.4< L 6_ CT/L 7_ CT< 2.3.
2 . The optical system of claim 1 , wherein the first and third lenses satisfy the following Equation 2:
0.85<( SD L 3 S 1)/( SD L 1 S 1)<0.95 [Equation 2]
(In Equation 2, SD L1S1 means an effective radius (Semi-aperture) of the object-side surface of the first lens, and SD L3S1 means an effective radius of an object-side surface of the third lens).
3 . The optical system of claim 2 , wherein the third lens has a negative refractive power, and
wherein an image-side surface of the third lens is concave.
4 . The optical system of claim 2 , wherein the sixth and seventh lenses satisfy the following Equation 3:
0.78<( SD L 6 S 2)/( SD L 7 S 1)<0.95 [Equation 3]
(In Equation 3, SD L6S2 means an effective radius of an image-side surface of the sixth lens, and SD L7S1 means an effective radius of an object-side surface of the seventh lens).
5 . The optical system of claim 4 , wherein an image-side surface of the fifth lens is concave,
wherein the sixth lens has a positive refractive power, and
wherein an object-side surface of the sixth lens is convex.
6 . The optical system of claim 4 , wherein the sixth lens has a positive refractive power,
wherein an object-side surface of the sixth lens is convex,
wherein the seventh lens has a negative refractive power, and
wherein an image-side surface of the seventh lens is concave.
7 . The optical system of claim 4 , wherein the sixth lens has a positive refractive power,
wherein an object-side surface of the sixth lens is convex, and
wherein an image-side surface of the fifth lens is concave.
8 . An optical system comprising:
first to seventh lenses sequentially arranged along an optical axis from an object side to an image side,
wherein the first lens has a positive refractive power and has a meniscus shape convex toward the object side,
wherein the second lens has a positive refractive power,
wherein an object-side surface of the second lens is convex,
wherein an image-side surface of the fourth lens is convex,
wherein an object-side surface of the fifth lens is concave,
wherein the first lens includes a first inflection point disposed on an object-side surface and a second inflection point disposed on an image-side surface,
wherein a distance between the optical axis and the first inflection point is greater than a distance between the optical axis and the second inflection point with respect to a vertical direction of the optical axis, and
wherein the first inflection point is radially disposed at a position corresponding to 80% to 99% of a maximum aperture radius of the object-side surface of the first lens, as measured from the optical axis.
9 . The optical system of claim 8 , wherein the second inflection point is radially disposed at a position corresponding to 55% to 85% of the maximum aperture radius of the image-side surface of the first lens, as measured from the optical axis.
10 . The optical system of claim 8 ,
wherein an object-side surface of the sixth lens is convex, and
wherein at least one of the object-side surface and an image-side surface of the sixth lens includes an inflection point.
11 . The optical system of claim 8 , wherein an image-side surface of the seventh lens is concave, and
wherein at least one of an object-side surface and the image-side surface of the seventh lens includes an inflection point.
12 . The optical system of claim 8 ,
wherein the fourth lens has a concave object-side surface, and
wherein an image-side surface of the fifth lens has a concave shape.
13 . The optical system of claim 8 ,
wherein a center interval between the first lens and the second lens is d12,
wherein a center interval between the sixth lens and the seventh lens is d67, and
wherein the optical system satisfies the following Equation:
0.1< d 12/ d 67<0.3. [Equation]
14 . An optical system comprising:
first to seventh lenses sequentially disposed along the optical axis from the object side to the image side,
wherein the first lens has a positive refractive power and has a convex meniscus shape toward the object side,
wherein the second lens has a positive refractive power,
wherein an object-side surface of the second lens is convex,
wherein an image-side surface of the fourth lens is convex,
wherein an object-side surface of the fifth lens is concave,
wherein an effective radius of an object-side surface of the first lens is greater than an effective radius of an object-side surface of the fourth lens;
wherein the optical system satisfies the following Equation:
1< f 2/ F< 1.4 [Equation 1]
(In Equation 1, F means an effective focal length of the optical system, and f2 means a focal length of the second lens),
wherein a center thickness of the sixth lens is L6_CT, and a center thickness of the seventh lens is L7_CT, and
wherein the sixth and seventh lenses satisfy Equation below:
1.4< L 6_ CT/L 7_ CT< 2.3.
15 . The optical system of claim 14 , comprising:
an aperture stop disposed around a periphery between the first lens and the second lens, and
wherein an image-side surface of the fifth lens is concave.
16 . The optical system of claim 14 ,
wherein the first and third lenses satisfy Equation 2 below:
0.85<( SD L 3 S 1)/( SD L 1 S 1)<0.95 [Equation 2]
(In Equation 2, SD L1S1 means an effective radius of the object-side surface of the first lens, and SD L3S1 means an effective radius of an object-side surface of the third lens).
17 . The optical system of claim 14 , wherein the third lens has a negative refractive power, and
wherein an image-side surface of the third lens is concave.
18 . The optical system of claim 14 , wherein the sixth lens has a positive refractive power,
wherein an object-side surface of the sixth lens is convex,
wherein the seventh lens has negative refractive power,
wherein an image-side of the seventh lens is concave,
wherein the sixth and seventh lenses satisfy Equation 3 below:
0.78<( SD L 6 S 2)/( SD L 7 S 1)<0.95 [Equation 3]
(In Equation 3, SD L6S2 means an effective radius of an image-side surface of the sixth lens, and SD L7S1 means an effective radius of an object-side surface of the seventh lens).