Terminal device and lens assembly

1 . A terminal device, comprising:

a first plate body and a first lens assembly,

wherein the first plate body has a light-transmitting area;

the first lens assembly comprises a prism, a lens group, a light-sensitive element, and a diaphragm, the prism having an object-side surface and an image-side surface, a light transmitted through the light-transmitting area sequentially transmitting through the object-side surface of the prism, the image-side surface of the prism, and the lens group, and being irradiated to the light- sensitive element, and an optical axis of the lens group being not parallel to a vertical line of the light-transmitting area; and

the diaphragm is provided between the image-side surface of the prism and the lens group,

wherein the prism has a first equivalent side length and a second equivalent side length which are equal to each other, the first equivalent side length is a length of projection of the object-side surface of the prism on a line where the optical axis of the lens group is located, and the second equivalent side length is a length of projection of the image-side surface of the prism on the vertical line of the light-transmitting area,

wherein a ratio of a total length TT of the first lens assembly to a combined focal length f of the lens group satisfies 1.6<(TT/f)<2.4,, and

wherein a length of the first equivalent side length is Y 1 , and the total length TT of the first lens assembly is a sum of the first equivalent side length Y 1 , a distance T 2 from the diaphragm to the image-side surface of the prism, and a distance TTL from the diaphragm to the light-sensitive element.

2 . The terminal device according to claim 1 , wherein the vertical line of the light-transmitting area is perpendicular to the first plate body, and the optical axis of the lens group is perpendicular to the vertical line of the light-transmitting area.

3 . The terminal device according to claim 1 , wherein a body diagonal length H of the light-sensitive element and the total length TT of the first lens assembly satisfy 0.6<(H/TT)<0.9.

4 . The terminal device according to claim 1 , wherein an optical factor Q of the first lens assembly satisfies 0.5≤Q≤0.9, and

wherein the optical factor Q is a ratio of the combined focal length f of the lens group to a body diagonal length H of the light-sensitive element.

5 . The terminal device according to claim 1 , wherein a length of the second equivalent side length is Y 2 , and an aperture coefficient F of the first lens assembly, the second equivalent side length Y 2 of the prism and a body diagonal length H of the light-sensitive element satisfy 0.1<Y 2 /(H·F)<0.6, and

wherein the aperture coefficient F is a ratio of the combined focal length f of the lens group to an aperture diameter D of a light-transmitting hole of the diaphragm.

6 . The terminal device according to claim 1 , wherein a length of the second equivalent side length is Y 2 , a first lens in the lens group closest to the image-side surface of the prism has an object-side surface protruding towards the image-side surface of the prism, and a radius of curvature R 1 of the object-side surface of the first lens and the second equivalent side length Y 2 of the prism satisfy 0<(R 1 /Y 2 )<12.

7 . The terminal device according to claim 1 , wherein a refractive index of the prism is a first refractive index n1, a refractive index of the first lens in the lens group closest to the image-side surface of the prism is a second refractive index n2, and the first refractive index n1 and the second refractive index n2 satisfy 0.83<(n1/n2)<1.7.

8 . The terminal device according to claim 1 , wherein a first spacing T 1 between the diaphragm and the lens group satisfies T 1 >0.

9 . The terminal device according to claim 1 , wherein the prism comprises a base body and a refractive index-enhancing sheet, the refractive index-enhancing sheet being attached to a sidewall of the base body, a material of the base body has a refractive index smaller than a refractive index of a material of the refractive index-enhancing sheet.

10 . The terminal device according to claim 1 , wherein each of the object-side surface and the image-side surface of the prism is curved and protrudes towards an outer normal direction of the prism.

11 . The terminal device according to claim 1 , wherein positions of the prism and the light-sensitive element are kept unchanged in the first lens assembly, a relative position of the diaphragm and the lens group is kept unchanged, and the diaphragm and the lens group are movable together between the prism and the light-sensitive element.

12 . A lens assembly, comprising: a prism, a lens group, a light-sensitive element, and a diaphragm,

wherein the prism has an object-side surface and an image-side surface;

a light transmitted through the prism sequentially transmits through the object-side surface of the prism, the image-side surface of the prism, and the lens group, and is irradiated to the light-sensitive element, and an optical axis of the lens group is not parallel to an optical axis of the object-side surface of the prism; and

the diaphragm is provided between the image-side surface of the prism and the lens group,

wherein the prism has a first equivalent side length and a second equivalent side length which are equal to each other, the first equivalent side length is a length of projection of the object-side surface of the prism on a line where the optical axis of the lens group is located, and the second equivalent side length is a length of projection of the image-side surface of the prism on the optical axis of the object-side surface of the prism

wherein a ratio of a total length TT of the lens assembly to a combined focal length f of the lens group satisfies 1.6<(TT/f)<2.4, and

wherein a length of the first equivalent side length is Y 1 , and the total length TT of the lens assembly is a sum of the first equivalent side length Y 1 , a distance T 2 from the diaphragm to the image-side surface of the prism, and a distance TTL from the diaphragm to the light-sensitive element.

13 . The lens assembly according to claim 12 , wherein the prism comprises a base body and a refractive index-enhancing sheet, the refractive index-enhancing sheet is attached to a sidewall of the base body, a material of the base body has a refractive index smaller than a refractive index of a material of the refractive index-enhancing sheet.

14 . The lens assembly according to claim 12 , wherein a body diagonal length H of the light-sensitive element and the total length TT of the lens assembly satisfy 0.6<(H/TT)<0.9.

15 . The lens assembly according to claim 12 , wherein an optical factor Q of the lens assembly satisfies 0.5≤Q≤0.9, and

wherein the optical factor Q is a ratio of the combined focal length f of the lens group to a body diagonal length H of the light-sensitive element.

16 . The lens assembly according to claim 12 , wherein a length of the second equivalent side length is Y 2 , and an aperture coefficient F of the lens assembly, the second equivalent side length Y 2 of the prism and a body diagonal length H of the light-sensitive element satisfy 0.1<Y 2 /(H·F)<0.6, and

wherein the aperture coefficient F is a ratio of the combined focal length f of the lens group to an aperture diameter D of a light-transmitting hole of the diaphragm.

17 . The lens assembly according to claim 12 , wherein a length of the second equivalent side length is Y 2 , a first lens in the lens group closest to the image-side surface of the prism has an object-side surface protruding towards the image-side surface of the prism, and a radius of curvature R 1 of the object-side surface of the first lens and the second equivalent side length Y 2 of the prism satisfy 0<(R 1 /Y 2 )<12.

18 . The lens assembly according to claim 12 , wherein a refractive index of the prism is a first refractive index n1, a refractive index of a first lens in the lens group closest to the image-side surface of the prism is a second refractive index n2, and the first refractive index n1 and the second refractive index n2 satisfy 0.83<(n1/n2)<1.7.

19 . The lens assembly according to claim 12 , wherein a first spacing T 1 between the diaphragm and the lens group satisfies T 1 >0.

20 . A camera module, comprising a lens assembly which comprises a prism, a lens group, a light-sensitive element, and a diaphragm,

wherein the prism has an object-side surface and an image-side surface;

a light transmitted through the prism sequentially transmits through the object-side surface of the prism, the image-side surface of the prism, and the lens group and is irradiated to the light-sensitive element, and an optical axis of the lens group is not parallel to an optical axis of the object-side surface of the prism; and

the diaphragm is provided between the image-side surface of the prism and the lens group,

wherein the prism has a first equivalent side length and a second equivalent side length which are equal to each other, the first equivalent side length is a length of projection of the object-side surface of the prism on a line where the optical axis of the lens group is located, and the second equivalent side length is a length of projection of the image-side surface of the prism on the optical axis of the object-side surface of the prism

wherein a ratio of a total length TT of the lens assembly to a combined focal length f of the lens group satisfies 1.6<(TT/f)<2.4, and

wherein a length of the first equivalent side length is Y 1 , and the total length TT of the lens assembly is a sum of the first equivalent side length Y 1 , a distance T 2 from the diaphragm to the image-side surface of the prism, and a distance TTL from the diaphragm to the light-sensitive element.