Lens assembly, camera, and electronic device
A lens assembly and an electronic device including the same are provided. The lens assembly includes a lens group. A lens that is in the lens group and that is close to an object side has a convex surface, and the convex surface protrudes from a shoulder of a lens tube. A head of the lens assembly may be reduced without affecting a maximum field of view of the lens assembly, so that the head of the lens assembly tends to be miniaturized. Therefore, a size of a hole provided on a display screen is reduced. Thus, a screen-to-body ratio of the display screen is improved.
1. An electronic device, comprising at least one camera, the camera having an object side and an image side and comprising:
at least a lens assembly having a lens tube; and
a lens group disposed in the lens tube,
the lens group having a first lens closest to the object side, the first lens having an effective region and a non-effective region, the non-effective region being formed around an outer edge of the effective region,
a ratio of a center thickness of the effective region to a thickness of the non-effective region is greater than or equal to 2.5 and less than or equal to 3.5,
the lens tube having a first end that faces the object side, the first end of the lens tube having an opening, the effective region of the first lens being disposed within the opening of the first end of the lens tube, and
the lens tube further comprising a first support part, the non-effective region of the first lens resting against the first support part of the lens tube, wherein the lens group further includes a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens disposed in sequence along the optical axis within the lens tube on a side of the first lens away from the object side, the effective region of the first lens has a convex surface protruding from the shoulder of the top portion of the lens tube,
the first lens, the third lens and the fifth lens are plastic lenses with refractive indexes are greater than 1.6, and the second lens, the fourth lens, and the sixth lens are plastic lenses with refractive indexes less than 1.55,
the first lens has a positive focal power, the third lens has a negative focal power, and the fifth lens has a positive focal power.
2. The electronic device of claim 1 , wherein a ratio of a diameter of the effective region to the center thickness of the effective region of the first lens is greater than 3.
3. The electronic device of claim 1 , wherein the first end of the lens tube has a top portion that encloses the opening, the top portion having a shoulder formed on an end surface of the top portion.
4. The electronic device of claim 3 , wherein the first support part is formed on an inner wall of the lens tube close to the top portion.
5. The electronic device of claim 3 , wherein the top portion has a side wall having a thickness greater than or equal to 0.1 mm and less than or equal to 0.25 mm.
6. The electronic device of claim 1 , wherein the width of the non-effective region of the first lens is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.
7. A lens assembly for a camera having an object side and an image side, the lens assembly comprising:
a lens tube; and
a lens group disposed in the lens tube,
the lens group having a first lens closest to the object side, the first lens having an effective region and a non-effective region, the non-effective region being formed around an outer edge of the effective region,
a ratio of a center thickness of the effective region to a thickness of the non-effective region is greater than or equal to 2.5 and less than or equal to 3.5,
the lens tube having a first end that faces the object side, the first end of the lens tube having an opening, the effective region of the first lens being disposed within the opening of the first end of the lens tube, and
the lens tube further comprising a first support part, the non-effective region of the first lens resting against the first support part of the lens tube, wherein the lens group further includes a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens disposed in sequence along the optical axis within the lens tube on a side of the first lens away from the object side, the effective region of the first lens has a convex surface protruding from the shoulder of the top portion of the lens tube,
the first lens, the third lens and the fifth lens are plastic lenses with refractive indexes are greater than 1.6, and the second lens, the fourth lens, and the sixth lens are plastic lenses with refractive indexes less than 1.55,
the first lens has a positive focal power, the third lens has a negative focal power, and the fifth lens has a positive focal power.
8. The lens assembly of claim 7 , wherein a ratio of a diameter of the effective region to the center thickness of the effective region of the first lens is greater than 3.
9. The lens assembly of claim 7 , wherein the first end of the lens tube has a top portion that encloses the opening, the top portion having a shoulder formed on an end surface of the top portion.
10. The lens assembly of claim 9 , wherein the first support part is formed on an inner wall of the lens tube close to the top portion.
11. The lens assembly of claim 9 , wherein the top portion has a side wall having a thickness greater than or equal to 0.1 mm and less than or equal to 0.25 mm.
12. The lens assembly of claim 7 , wherein the width of the non-effective region of the first lens is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.