Lens module
A lens module including a lens barrel and a plurality of lenses having refractive power is provided. The lenses are arranged in the lens barrel from an object side to an image side. The lens barrel has an inner-wall surface and an outer-wall surface opposite to each other, and has an air outlet communicating with outside. The air outlet is located between the inner-wall surface and the outer-wall surface. A first lens of these lenses is a lens closest to the object side. The first lens has an object-side optical surface facing the object side. At least over 95% of the surface area of the object-side optical surface of the first lens is exposed to outside, and a material of the first lens is glass. Furthermore, another lens module is also provided.
1. A lens module comprising a lens barrel and a plurality of lenses having refractive power, wherein,
the lens barrel has an inner-wall surface and an outer-wall surface opposite to each other and is provided with an air outlet communicating with the outside, wherein the air outlet is located between the inner-wall surface and the outer-wall surface; and
a first lens of the lenses is the lens closest to an object side, the first lens has an object-side optical surface facing the object side, and at least over 95% of a surface area of the optical surface of the first lens is exposed to the outside, and a material of the first lens is glass, wherein the air outlet is capable of communicating with an inside space being inside the lens barrel and reaching a surface of the first lens facing away from the object side.
2. The lens module according to claim 1 , wherein the inner-wall surface defines an accommodation space, and the outer-wall surface faces the outside, wherein the lenses are disposed in the accommodation space and lean on the inner-wall surface.
3. The lens module according to claim 2 , wherein a penetration direction of the air outlet is substantially parallel to an optical axis direction of the lens.
4. The lens module according to claim 2 , wherein a penetration direction of the air outlet is substantially perpendicular to an optical axis direction of the lens.
5. The lens module according to claim 2 , wherein the outer-wall surface of the lens barrel is provided with a threaded portion.
6. The lens module according to claim 5 , wherein the threaded portion is adapted to be screwed to a lens holder.
7. The lens module according to claim 1 , wherein the lenses further comprise a second lens, and the second lens is the lens closest to an image side, and a material of the second lens is plastic and has a cut edge.
8. The lens module according to claim 1 , wherein at least over 98% of the surface area of the optical surface of the first lens is exposed to the outside.
9. The lens module according to claim 7 , wherein the lenses further comprise a third lens disposed between the first lens and the second lens.
10. The lens module according to claim 8 , further comprising a spacer disposed in the lens barrel, and the spacer is configured to lean on at least one of the lenses.
11. A lens module comprising a lens barrel and a plurality of lenses having refractive power, wherein,
the lens barrel has an inner-wall surface and an outer-wall surface opposite to each other and is provided with an air outlet communicating with the outside, wherein the air outlet is located between the inner-wall surface and the outer-wall surface; and
a first lens of the lenses is the lens closest to an object side, the first lens has an object-side optical surface facing the object side, a material of the first lens is glass,
wherein there is no retainer to cover the object-side optical surface of the first lens, and the air outlet is capable of communicating with an inside space being inside the lens barrel and reaching a surface of the first lens facing away from the object side.
12. The lens module according to claim 11 , wherein the inner-wall surface defines an accommodation space, and the outer-wall surface faces the outside, wherein the lenses are disposed in the accommodation space and lean on the inner-wall surface.
13. The lens module according to claim 12 , wherein a penetration direction of the air outlet is substantially parallel to an optical axis direction of the lens.
14. The lens module according to claim 12 , wherein a penetration direction of the air outlet is substantially perpendicular to an optical axis direction of the lens.
15. The lens module according to claim 12 , wherein the outer-wall surface of the lens barrel is provided with a threaded portion.
16. The lens module according to claim 15 , wherein the threaded portion is adapted to be screwed to a lens holder.
17. The lens module according to claim 11 , wherein the lenses further comprise a second lens, and the second lens is the lens closest to an image side, and a material of the second lens is plastic and has a cut edge.
18. The lens module according to claim 17 , wherein the lenses further comprise a third lens disposed between the first lens and the second lens.
19. The lens module according to claim 18 , further comprising a spacer disposed in the lens barrel, and the spacer is configured to lean on at least one of the lenses.
20. The lens module according to claim 11 , wherein at least over 98% of the surface area of the optical surface of the first lens is exposed to the outside.