1. A rubber composition for a sidewall, comprising a rubber component comprising 10 to 60% by weight of a butadiene rubber, wherein syndiotactic-1,2-polybutadiene having an average primary particle diameter of not more than 100 nm is dispersed in said butadiene rubber.
2. A tire having a sidewall, which comprises the rubber composition for a sidewall of claim 1.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An imaging lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
a second lens element with negative refractive power, at least one of the object-side and image-side surfaces thereof being aspheric; and
a third lens element with negative refractive power having a concave image-side surface, both of the object-side and image-side surfaces thereof being aspheric; and wherein the imaging lens assembly further comprises an aperture stop disposed between the first lens element and the second lens element, and an electronic sensor for image formation; wherein there are three lens elements with refractive power; and wherein a focal length of the imaging lens assembly is f, a focal length of the second lens element is f2, a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the image-side surface of the first lens element is R2, a radius of curvature of the object-side surface of the second lens element is R3, a distance on the optical axis between the aperture stop and the electronic sensor is SL, a distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, and they satisfy the following relations:
\u22120.70<ff2<\u22120.24;
\u22120.30<R1R2<0.00;
\u22120.40<R3f<\u22120.24;
0.75<SLTTL<0.90.
2. The imaging lens assembly according to claim 1, wherein the second lens element has a concave object-side surface and a convex image-side surface, is made of plastic material, and has at least one inflection point formed on the object-side and image-side surfaces.
3. The imaging lens assembly according to claim 2, wherein the focal length of the imaging lens assembly is f, the focal length of the first lens element is f1, and they satisfy the relation: 1.10<ff1<1.48.
4. The imaging lens assembly according to claim 3, wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and they satisfy the relation: 31.0<V1\u2212V2<45.0.
5. The imaging lens assembly according to claim 2, wherein the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the first lens element is R2, and they satisfy the relation: \u22120.15<R1R2<0.00.
6. The imaging lens assembly according to claim 1, wherein the focal length of the imaging lens assembly is f, the focal length of the second lens element is f2, and they satisfy the relation: \u22120.45<ff2<\u22120.29.
7. The imaging lens assembly according to claim 3, wherein radius of curvature of the object-side surface of the first lens element is R1, the focal length of the imaging lens assembly is f, and they satisfy the relation: 0.30<R1f<0.50.
8. The imaging lens assembly according to claim 3, wherein the focal length of the second lens element is f2, the focal length of the third lens element is f3, and they satisfy the relation: 0.08<f2f3<0.40.
9. The imaging lens assembly according to claim 2, wherein radius of curvature of the object-side surface of the third lens element is R5, the radius of curvature of the image-side surface of the third lens element is R6, and they satisfy the relation: 1.10<R5R6<1.60.
10. The imaging lens assembly according to claim 2, wherein a distance on the optical axis between the first lens element and the second lens element is T12, the focal length of the imaging lens assembly is f, and they satisfy the relation: 1.35<(T12f)*10<1.85.
11. The imaging lens assembly according to claim 2, wherein the distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, half of the diagonal length of the effective pixel area of the electronic sensor is ImgH, and they satisfy the relation: TTLImgH<2.0.
12. An imaging lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, at least one of the object-side and the image-side surfaces thereof being aspheric; and
a third lens element with negative refractive power having a concave image-side surface, both of the object-side and image-side surfaces thereof being aspheric, at least one inflection point formed on the object-side and image-side surfaces; and wherein the imaging lens assembly further comprises an aperture stop disposed between the first lens element and the second lens element, and an electronic sensor for image formation; wherein there are three lens elements with refractive power; and wherein a focal length of the imaging lens assembly is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a distance on the optical axis between the aperture stop and the electronic sensor is SL, a distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, and they satisfy the following relations:
\u22120.45<ff2<\u22120.29;
1.10<ff1<1.48;
0.75<SLTTL<0.90.
13. The imaging lens assembly according to claim 12, wherein the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the first lens element is R2, and they satisfy the relation: \u22120.30<R1R2<0.00.
14. The imaging lens assembly according to claim 13, wherein the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the first lens element is R2, and they satisfy the relation: \u22120.15<R1R2<0.00.
15. The imaging lens assembly according to claim 12, wherein the Abbe number of the first lens element is V1, the Abbe number of the second lens element is V2, and they satisfy the relation: 31.0<V1\u2212V2<45.0.
16. The imaging lens assembly according to claim 15, wherein the Abbe number of the first lens element is V1, the Abbe number of the second lens element is V2, and they satisfy the relation: 33.5<V1\u2212V2<45.0.
17. The imaging lens assembly according to claim 15, wherein a distance on the optical axis between the first lens element and the second lens element is T12, the focal length of the imaging lens assembly is f, and they satisfy the relation: 1.35<(T12f)*10<1.85.
18. The imaging lens assembly according to claim 17, wherein radius of curvature of the object-side surface of the first lens element is R1, the focal length of the imaging lens assembly is f, and they satisfy the relation: 0.30<R1f<0.50.
19. The imaging lens assembly according to claim 14, wherein the focal length of the second lens element is f2, the focal length of the third lens element is f3, and they satisfy the relation: 0.08<f2f3<0.40.
20. An imaging lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, at least one of the object-side and the image-side surfaces thereof being aspheric; and
a third lens element with negative refractive power having a concave image-side surface, both of the object-side and image-side surfaces thereof being aspheric, at least one inflection point formed on the object-side and image-side surfaces; and wherein the imaging lens assembly further comprises an aperture stop disposed between the first lens element and the second lens element, and an electronic sensor for image formation; wherein there are three lens elements with refractive power; and wherein a focal length of the imaging lens assembly is f, a focal length of the second lens element is f2, a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the image-side surface of the first lens element is R2, an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, a distance on the optical axis between the aperture stop and the electronic sensor is SL, a distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL, and they satisfy the following relations:
\u22120.70<ff2<\u22120.24;
\u22120.30<R1R2<0.00;
31.0<V1\u2212V2<45.0;
0.75<SLTTL<0.90.
21. The imaging lens assembly according to claim 20, wherein the focal length of the imaging lens assembly is f, the focal length of the second lens element is f2, and they satisfy the relation: \u22120.45<ff2<\u22120.29.
22. The imaging lens assembly according to claim 20, wherein the first lens element, the second lens element, and the third lens element are made of plastic material, a distance on the optical axis between the first lens element and the second lens element is T12, the focal length of the imaging lens assembly is f, and they satisfy the relation: 1.35<(T12f)*10<1.85.
23. The imaging lens assembly according to claim 22, wherein the Abbe number of the first lens element is V1, the Abbe number of the second lens element is V2, and they satisfy the relation: 33.5<V1\u2212V2<45.0.