Camera module and vehicle equipped therewith

Abstract

To reduce thermal deformation or shape changes due to temperature differences between lenses. [Solution] The lens barrel includes lens sections 111, 113, and 115 having first to third lenses positioned in a through-hole 515 of the lens barrel and having optical axes aligned from the object side toward the sensor side, and an image sensor 192, wherein the refractive index of the second lens is lower than that of the first lens, and the first to third lenses each include first to third flange sections 111A, 113A, and 115A, respectively, the outer diameter of the lens barrel is the first outer diameter at the position where the upper part of the first flange section contacts the lens barrel, the outer diameter of the lens barrel is the second outer diameter at the position where the upper part of the second flange section contacts the lens barrel, the outer diameter of the lens barrel is the third outer diameter at the position where the upper part of the third flange section contacts the lens barrel, and the outer diameter of the lens barrel is the fourth outer diameter at the position where the upper part of the image sensor contacts the lens barrel, and the third outer diameter may be smaller than the fourth radius and larger than the second outer diameter.

Claims

1. A lens barrel with a through hole inside, A lens section having a first lens, a second lens, and a third lens positioned in the through-hole of the lens barrel, with their optical axes aligned from the object side toward the sensor side, Image sensor and Includes, The material of the second lens and the material of the first lens are different. The refractive index of the second lens is lower than that of the first lens. Each of the first lens, second lens, and third lens includes a first flange portion, a second flange portion, and a third flange portion that extend from the optical axis toward the inner wall of the lens barrel, The lens barrel includes a first support portion located outside the first flange portion, a second support portion located outside the second flange portion, and a third support portion located outside the third flange portion. At the position where the upper part of the first flange portion and the lens barrel come into contact, the outer diameter of the lens barrel is the first outer diameter. At the position where the upper part of the second flange portion and the lens barrel come into contact, the outer diameter of the lens barrel is the second outer diameter. At the position where the upper part of the third flange portion and the lens barrel come into contact, the outer diameter of the lens barrel is the third outer diameter. At the position where the upper part of the image sensor and the lens barrel come into contact, the outer diameter of the lens barrel is the fourth outer diameter. The third outer diameter is smaller than the fourth outer diameter and larger than the second outer diameter. On the optical axis, the first lens includes an object-side first surface and a sensor-side second surface. On the optical axis, the third surface on the object side and the fourth surface on the sensor side of the second lens have different radii of curvature from each other. A camera module in which the center of the first contact surface, where the second flange portion of the second lens contacts the inner surface of the second support portion, is located closer to the side of the third and fourth surfaces with a larger radius of curvature, with reference to the center of the thickness of the second flange portion.

2. The first outer diameter is smaller than the third outer diameter. The first lens is made of glass, The camera module according to claim 1, wherein the second lens is made of plastic material.

3. The optical filter is located inside the lower end of the lens barrel and positioned between the third lens and the image sensor, The camera module according to claim 1, wherein the third lens is made of plastic material.

4. The camera module according to claim 1 or 2, wherein the thickness of the first support portion is the minimum distance between the inner and outer surfaces of the first support portion and is the same as the thickness of the second support portion.

5. The camera module according to claim 3, wherein the thickness of the second support portion is the minimum distance between the inner and outer surfaces of the second support portion and is the same as the thickness of the third support portion.

6. A lens barrel with a through hole inside, The first lens, second lens, and third lens are positioned in the through-hole of the lens barrel, and their optical axes are aligned from the object side toward the sensor side. Includes, The material of the second lens and the material of the first lens are different. The refractive index of the second lens is lower than that of the first lens. Each of the first lens, second lens, and third lens includes a first flange portion, a second flange portion, and a third flange portion that extend from the optical axis toward the inner surface of the lens barrel, The lens barrel includes a first support portion located outside the first flange portion, a second support portion located outside the second flange portion, and a third support portion located outside the third flange portion. The first, second, and third support portions include sections outside the first, second, and third lenses where the inner wall and outer surface of the lens barrel are perpendicular to each other. With respect to a hypothetical straight line parallel to the optical axis on the lower outer surface of the lens barrel, the outer surface of the first support portion has a first depth, the outer surface of the second support portion has a second depth, and the outer surface of the third support portion has a third depth. The second depth is greater than the first depth and less than the third depth. On the optical axis, the first lens includes an object-side first surface and a sensor-side second surface. On the optical axis, the third surface on the object side and the fourth surface on the sensor side of the second lens have different radii of curvature from each other. A camera module in which the center of the first contact surface, where the second flange portion of the second lens contacts the inner surface of the second support portion, is located closer to the side of the third and fourth surfaces with a larger radius of curvature, with reference to the center of the thickness of the second flange portion.

7. The optical filter is located inside the lower end of the lens barrel and positioned between the third lens and the image sensor, The first and second surfaces of the first lens are spherical. The camera module according to claim 6, wherein the object-side fifth surface and the sensor-side sixth surface of the third lens are aspherical.

8. The camera module according to claim 6 or 7, wherein the thickness of the first support portion is the minimum distance between the inner and outer surfaces of the first support portion and is the same as the thickness of the second support portion.

9. The camera module according to claim 8, wherein the thickness of the second support portion is the minimum distance between the inner and outer surfaces of the second support portion and is the same as the thickness of the third support portion.

10. The camera module according to claim 1 or 6, comprising a first inclined portion extending from the first support portion toward the second support portion, and a second inclined portion extending from the second support portion toward the third support portion.

11. The inner surface of the second support portion is in contact with the outer surface of the second flange portion. The camera module according to claim 1 or 6, wherein the length of the first contact surface in which the second flange portion of the second lens contacts the inner surface of the second support portion is 20% to 50% of the thickness of the second flange portion.

12. The camera module according to claim 11, wherein the center of the first contact surface is located closer to the object than the center of the second flange portion of the second lens.

13. The camera module according to claim 11, wherein the difference in radius of curvature between the third surface and the fourth surface is 1 mm or more.

14. The radius of curvature of the third surface is greater than the radius of curvature of the fourth surface. The camera module according to claim 13, wherein the center of the first contact surface is located closer to the object than the center of the second flange portion of the second lens.

15. The camera module according to claim 14, wherein the diameter of the first lens is smaller than the diameter of the second lens.

16. The refractive index of the third lens is lower than that of the first lens. The third flange portion of the third lens includes a second contact surface that contacts the inner surface of the third support portion of the lens barrel. The camera module according to claim 1 or 6, wherein the length of the second contact surface is 20% to 50% of the thickness of the third flange portion.

Images