Optical imaging lens assembly with spacing element design
An optical imaging lens assembly is provided, including: an imaging lens group, a plurality of spacing elements, and a lens barrel configured to accommodate the imaging lens group and the plurality of spacing elements including a third spacing element that is placed between the third lens and the fourth lens and is in contact with an image-side surface of the third lens. Here, an inner diameter d 3 s of an object-side surface of the third spacing element, a radius of curvature R 5 of an object-side surface of the third lens and a radius of curvature R 6 of the image-side surface of the third lens satisfy: 5.0<d 3 s /(R 5 +R 6 )<10.5.
1 . An optical imaging lens assembly, comprising:
an imaging lens group, comprising, sequentially along an optical axis from an object side to an image side: a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power and a sixth lens having a positive refractive power,
a plurality of spacing elements, comprising: a third spacing element that is placed between the third lens and the fourth lens and is in contact with an image-side surface of the third lens,
wherein an inner diameter d 3 s of an object-side surface of the third spacing element, a radius of curvature R 5 of an object-side surface of the third lens and a radius of curvature R 6 of the image-side surface of the third lens satisfy: 5.0<d 3 s /(R 5 +R 6 )<10.5.
2 . The optical imaging lens assembly according to claim 1 , wherein the plurality of spacing elements further comprise: a fourth spacing element that is placed between the fourth lens and the fifth lens and is in contact with an image-side surface of the fourth lens,
wherein an effective focal length f 4 of the fourth lens, a center thickness CT 5 of the fifth lens on the optical axis, an air spacing T 45 between the fourth lens and the fifth lens on the optical axis, a maximal thickness CP 4 of the fourth spacing element along the direction of the optical axis and a spacing EP 45 between the fourth spacing element and the fifth spacing element along the direction of the optical axis satisfy:−17.5<(CT 5 +T 45 )×EP 45 /(CP 4 ×f 4 )<−5.0, wherein the fifth spacing element is placed between the fifth lens and the sixth lens and is in contact with an image-side surface of the fifth lens.
3 . The optical imaging lens assembly according to claim 1 , wherein a radius of curvature R 7 of an object-side surface of the fourth lens, a radius of curvature R 8 of the image-side surface of the fourth lens, the outer diameter D 5 m of the image-side surface of the fifth spacing element and an inner diameter d 5 m of the image-side surface of the fifth spacing element satisfy: −7.5<(R 7 +R 8 )/(D 5 m −d 5 m )<−1.0, wherein the fifth spacing element is placed between the fifth lens and the sixth lens and is in contact with an image-side surface of the fifth lens.
4 . The optical imaging lens assembly according to claim 1 , wherein an inner diameter d 5 s of an object-side surface of the fifth spacing element, an inner diameter dos of an object-side surface of the sixth spacing element, a center thickness CT 6 of the sixth lens on the optical axis and an air spacing T 56 between the fifth lens and the sixth lens on the optical axis satisfy: 10.0<(d 5 s +d 6 s )/(CT 6 +T 56 )<13.5, wherein the fifth spacing element is placed between the fifth lens and the sixth lens and is in contact with an image-side surface of the fifth lens, and the sixth spacing element is disposed on an image side of the sixth lens and is in contact with the image-side surface of the sixth lens.
5 . The optical imaging lens assembly according to claim 1 , wherein the plurality of spacing elements further comprise: a fourth spacing element that is placed between the fourth lens and the fifth lens and is in contact with an image-side surface of the fourth lens,
wherein an inner diameter d 4 s of an object-side surface of the fourth spacing element, a spacing EP 45 between the fourth spacing element a the fifth spacing element along the direction of the optical axis and a center thickness CT 4 of the fourth lens on the optical axis satisfy: 4.0<(d 4 s −EP 45 )/CT 4 <9.0, wherein the fifth spacing element is placed between the fifth lens and the sixth lens and is in contact with an image-side surface of the fifth lens.
6 . The optical imaging lens assembly according to claim 1 , wherein the plurality of spacing elements further comprise: a fourth spacing element that is placed between the fourth lens and the fifth lens and is in contact with an image-side surface of the fourth lens,
wherein a center thickness CT 3 of the third lens on the optical axis, a center thickness CT 4 of the fourth lens on the optical axis, a maximal thickness CP 3 of the third spacing element along the direction of the optical axis and a maximal thickness CP 4 of the fourth spacing element along the direction of the optical axis satisfy: 11.0<CT 3 /CP 3 −CT 4 /CP 4 <17.5.
7 . The optical imaging lens assembly according to claim 1 , wherein the plurality of spacing elements further comprise: a first spacing element that is placed between the first lens and the second lens and is in contact with an image-side surface of the first lens, and an effective focal length f 1 of the first lens, an effective focal length f 5 of the fifth lens, an effective focal length f 6 of the sixth lens, a maximal thickness CP 1 of the first spacing element along the direction of the optical axis, a maximal thickness CP 5 of a fifth spacing element along the direction of the optical axis and a maximal thickness CP 6 of the sixth spacing element along the direction of the optical axis satisfy: |f 6 ×CP 1 /(CP 5 ×f 5 +f 1 ×CP 6 )|<37.0, wherein the fifth spacing element is placed between the fifth lens and the sixth lens and is in contact with an image-side surface of the fifth lens, and the sixth spacing element is disposed on an image side of the sixth lens and is in contact with the image-side surface of the sixth lens.
8 . The optical imaging lens assembly according to claim 1 , wherein the plurality of spacing elements further comprise: a first spacing element that is placed between the first lens and the second lens and is in contact with an image-side surface of the first lens, and a maximal thickness CP 1 of the first spacing element along the direction of the optical axis, a radius of curvature R 1 of an object-side surface of the first lens and a radius of curvature R 2 of an image-side surface of the first lens satisfy: 110.0<(R 1 +R 2 )/CP 1 <135.0.
9 . The optical imaging lens assembly according to claim 1 , wherein the plurality of spacing elements further comprise: a fourth spacing element that is placed between the fourth lens and the fifth lens and is in contact with the image-side surface of the fourth lens,
wherein an effective focal length f 6 of the sixth lens, a radius of curvature R 7 of an object-side surface of the fourth lens, a radius of curvature R 11 of an object-side surface of the sixth lens and a maximal thickness CP 4 of the fourth spacing element along the direction of the optical axis satisfy: −230.0<f 6 /R 11 +R 7 /CP 4 <311.0.
10 . The optical imaging lens assembly according to claim 1 , wherein the plurality of spacing elements further comprise at least one auxiliary spacing element placed between any two adjacent lenses, an object-side surface of the auxiliary spacing element is in contact with a spacing element located on an object side of the auxiliary spacing element or with an other auxiliary spacing element, and an image-side surface of the auxiliary spacing element is in contact with a lens located on an image side of the auxiliary spacing element or with an other auxiliary spacing element.
11 . The optical imaging lens assembly according to claim 2 , wherein a radius of curvature R 7 of an object-side surface of the fourth lens, a radius of curvature R 8 of the image-side surface of the fourth lens, the outer diameter D 5 m of the image-side surface of the fifth spacing element and an inner diameter d 5 m of the image-side surface of the fifth spacing element satisfy: −7.5<(R 7 +R 8 )/(D 5 m −d 5 m )<−1.0.
12 . The optical imaging lens assembly according to claim 2 , wherein an inner diameter d 5 s of an object-side surface of the fifth spacing element, an inner diameter d 6 s of an object-side surface of a sixth spacing element, a center thickness CT 6 of the sixth lens on the optical axis and an air spacing T 56 between the fifth lens and the sixth lens on the optical axis satisfy: 10.0<(d 5 s +d 6 s )/(CT 6 +T 56 )<13.5, wherein the sixth spacing element is disposed on an image side of the sixth lens and is in contact with the image-side surface of the sixth lens.
13 . The optical imaging lens assembly according to claim 5 , wherein the plurality of spacing elements further comprise: a first spacing element that is placed between the first lens and the second lens and is in contact with an image-side surface of the first lens, and a maximal thickness CP 1 of the first spacing element along the direction of the optical axis, a radius of curvature R 1 of an object-side surface of the first lens and a radius of curvature R 2 of an image-side surface of the first lens satisfy: 110.0<(R 1 +R 2 )/CP 1 <135.0.
14 . The optical imaging lens assembly according to claim 7 , wherein the maximal thickness CP 1 of the first spacing element along the direction of the optical axis, a radius of curvature R 1 of an object-side surface of the first lens and a radius of curvature R 2 of an image-side surface of the first lens satisfy: 110.0<(R 1 +R 2 )/CP 1 <135.0.
15 . The optical imaging lens assembly according to claim 5 , wherein the plurality of spacing elements further comprise: a first spacing element that is placed between the first lens and the second lens and is in contact with an image-side surface of the first lens, and the fourth spacing element that is placed between the fourth lens and the fifth lens and is in contact with the image-side surface of the fourth lens,
wherein an effective focal length f 6 of the sixth lens, a radius of curvature R 7 of an object-side surface of the fourth lens, a radius of curvature R 11 of an object-side surface of the sixth lens and a maximal thickness CP 4 of the fourth spacing element along the direction of the optical axis satisfy: −230.0<f 6 /R 11 +R 7 /CP 4 <311.0.
16 . The optical imaging lens assembly according to claim 7 , wherein the plurality of spacing elements further comprise: a fourth spacing element that is placed between the fourth lens and the fifth lens and is in contact with the image-side surface of the fourth lens,
wherein the effective focal length f 6 of the sixth lens, a radius of curvature R 7 of an object-side surface of the fourth lens, a radius of curvature R 11 of an object-side surface of the sixth lens and a maximal thickness CP 4 of the fourth spacing element along the direction of the optical axis satisfy: −230.0<f 6 /R 11 +R 7 /CP 4 <311.0.