Imaging lens system
Provided is an imaging lens system including a first lens having a positive refractive power, an image-side surface of the first lens is concave, a first reflecting member disposed adjacent to the first lens, an object-side surface of the first reflecting member is concave, a second lens having a negative refractive power, an image-side surface of the second lens is concave, a third lens disposed adjacent to the image-side surface of the second lens, a second reflecting member disposed adjacent to the second lens or the third lens, an image-side surface of the second reflecting member having a convex shape, and an image sensor, wherein the first lens, the second lens and the third lens are sequentially disposed from a side of an object toward the image sensor, and wherein the object-side surface of the first reflecting member and the image-side surface of the second reflecting member include reflective surfaces.
1 . An imaging lens system comprising:
an image sensor;
a first lens on the image sensor, the first lens having an image-side surface that is concave, the first lens having a first hole penetrating a central portion of the first lens;
a first reflecting member disposed adjacent to the first lens;
a second reflecting member disposed between the first reflecting member and the image sensor;
a second lens disposed between the first reflecting member and the image sensor,
wherein an object-side surface of the first reflecting member and an image-side surface of the second reflecting member include reflective surfaces,
wherein the first lens, the first reflecting member and the second reflecting member are configured to satisfy:
1 <f/TTL< 3,
where, f is a total effective focal length of the imaging lens system, and TTL is a distance from an object-side surface of the first lens to an image surface of the image sensor, and
wherein the second reflecting member has a second hole penetrating a central portion of the second reflecting member and at least a portion of the second lens is included in the second hole.
2 . The imaging lens system of claim 1 , wherein an effective diameter of the object-side surface of the first lens is greater than an effective diameter of an image-side surface of the first lens.
3 . The imaging lens system of claim 1 , wherein at least one of the first reflecting member or the second reflecting member is an aspherical lens.
4 . The imaging lens system of claim 3 , wherein the first lens is a spherical or aspherical lens.
5 . The imaging lens system of claim 1 , wherein an image-side surface of the first lens is concave.
6 . The imaging lens system of claim 1 , wherein the object-side surface of the first reflecting member is concave.
7 . The imaging lens system of claim 1 , wherein the image-side surface of the second reflecting member has a convex shape.
8 . The imaging lens system of claim 1 , wherein an effective diameter of the object-side surface of the first lens ranges from 0.8 times to 3 times a diagonal length of the image surface of the image sensor.
9 . The imaging lens system of claim 1 ,
wherein the first reflecting member is disposed to overlap with the first hole in a direction parallel to an optical axis of the imaging lens system.
10 . The imaging lens system of claim 1 , wherein the distance from the object-side surface of the first lens to the image surface of the image sensor is less than 10 mm and greater than zero.
11 . An imaging lens system comprising:
a first lens having a positive refractive power, an image-side surface of the first lens is concave, the first lens has a first hole penetrating a central portion of the first lens;
a first reflecting member disposed adjacent to the first lens, an object-side surface of the first reflecting member is concave;
a second lens having a negative refractive power, an image-side surface of the second lens is concave;
a third lens disposed adjacent to the image-side surface of the second lens;
a second reflecting member disposed adjacent to the second lens or the third lens, an image-side surface of the second reflecting member having a convex shape; and
an image sensor,
wherein the first lens, the second lens and the third lens are sequentially disposed from a side of an object toward the image sensor,
wherein the object-side surface of the first reflecting member and the image-side surface of the second reflecting member include reflective surfaces, and
wherein the second reflecting member has a second hole penetrating a central portion of the second reflecting member and at least a portion of the second lens or at least a portion of the third lens is included in the second hole.
12 . The imaging lens system of claim 11 , wherein the third lens has a negative refractive power and an image-side surface of the third lens is concave.
13 . The imaging lens system of claim 12 , further comprising:
a fourth lens and a fifth lens sequentially disposed between the third lens and the image sensor,
wherein the fourth lens has a positive refractive power and an image-side surface of the fourth lens is convex.
14 . The imaging lens system of claim 13 , wherein the fifth lens has a negative refractive power and an image-side surface of the fifth lens is convex.
15 . An imaging lens system comprising:
a first lens having an image-side surface that is concave, the first lens has a first hole penetrating a central portion of the first lens;
a first reflecting member disposed adjacent to the first lens, an object-side surface of the first reflecting member is concave;
a second lens having an image-side surface that is concave;
a third lens having an image-side surface that is concave;
a second reflecting member disposed adjacent to the second lens or the third lens, an image-side surface of the second reflecting member is convex; and
an image sensor,
wherein the first lens, the second lens and the third lens are sequentially disposed from a side of an object toward the image sensor, and
wherein the object-side surface of the first reflecting member and the image-side surface of the second reflecting member include reflective surfaces, and
wherein the second reflecting member has a second hole penetrating a central portion of the second reflecting member and at least a portion of the second lens or at least a portion of the third lens is included in the second hole.
16 . The imaging lens system of claim 15 ,
wherein the first reflecting member is disposed to overlap with the first hole in a direction parallel to an optical axis of the imaging lens system.
17 . The imaging lens system of claim 15 ,
wherein the second lens or the third lens is disposed to overlap with the second hole in a direction parallel to an optical axis of the imaging lens system.
18 . The imaging lens system of claim 15 , further comprising:
a fourth lens and a fifth lens sequentially disposed between the third lens and the image sensor,
wherein an image-side surface of the fourth lens is convex, and an image-side surface of the fifth lens is convex.
19 . The imaging lens system of claim 18 , further comprising:
an infrared filter disposed between the fifth lens and the image sensor.
20 . The imaging lens system of claim 15 , wherein a distance from an object-side surface of the first lens to an image surface of the image sensor is less than 10 mm and greater than zero.