Capsule endoscope optical lens assembly

Abstract

A capsule endoscope optical lens assembly, which comprises: an optical lens, an image plane disposed on an image side of the optical lens, and an optical filter disposed between the image plane and the optical lens. The optical lens comprises a lens barrel, and a plurality of lenses accommodated in the lens barrel and sequentially arranged from an object side to the image side, wherein the lenses comprise a first lens close to the object side, a second lens close to the image side, and at least one third lens arranged between the first lens and the second lens, the second lens being a glass lens; the lens barrel comprises an annular barrel wall; and the first lens and the barrel wall are fixedly connected by means of a black adhesive. The lens of the capsule endoscope optical lens assembly closest to the image side is made of glass, such that the lens assembly has better optical system performance, a larger aperture and a wider field of view. Moreover, the lens closest to the object side is fixed to the lens barrel by means of the black adhesive, such that a retaining ring component is omitted, thereby reducing the head size of the optical lens, effectively blocking stray light, and having low costs.

Description

Capsule endoscope optical lens assembly TECHNICAL FIELD

[0001] The utility model relates to optical imaging technical field especially relates to a capsule endoscope optical lens assembly. BACKGROUND

[0002] In prior art, the capsule endoscope optical lens assembly generally adopts several pure plastic lenses, which are stacked and assembled into a lens barrel, because the optical system has a large field of view angle, the aperture of the first lens near the object side is much larger than that of the subsequent lenses, resulting in that the lens size is large, in prior art, the lens assembly sequence is from the first lens near the image side, which can reduce the size of the lens near the image side, but the size of the side near the object side is still limited because the pressure ring is added to fix the lens, and the pressure ring needs to block stray light.

[0003] In prior art, pure plastic lenses are adopted, under the condition of size limitation, the imaging performance, aperture and field of view angle cannot be better, and because of the existence of the pressure ring, the size of the front end of the capsule endoscope optical lens assembly is limited and cannot be smaller. TECHNICAL PROBLEM

[0004] Therefore, it is necessary to provide a capsule endoscope optical lens assembly to solve the above technical problems. TECHNICAL SOLUTION

[0005] The utility model discloses a capsule endoscope optical lens assembly aims at solving the problem of large size of the object side end of the traditional capsule endoscope optical lens assembly and high cost.

[0006] In order to achieve the above purpose, the utility model provides a capsule endoscope optical lens assembly, which comprises an optical lens, an imaging surface arranged on the image side of the optical lens and an optical filter arranged between the imaging surface and the optical lens, the optical lens comprises a lens barrel and a plurality of lenses arranged in sequence from the object side to the image side and accommodated in the lens barrel, the lenses comprise a first lens near the object side, a second lens near the image side and at least one third lens arranged between the first lens and the second lens, the second lens is a glass lens, the lens barrel comprises an annular barrel wall, and the first lens is fixedly connected with the barrel wall through black glue.

[0007] Preferably, the first lens comprises an optical part located in the middle and a bearing part arranged around the optical part, and the effective diameter of the optical part is greater than the length of the diagonal line of the imaging surface.

[0008] Preferably, the outer diameter of the first lens, the outer diameter of the third lens and the outer diameter of the second lens gradually decrease along a direction from the object side to the image side.

[0009] Preferably, the lens barrel further comprises a support wall which is formed by bending and extending from an end of the barrel wall close to the image side, the end of the barrel wall close to the object side surrounds a first light passing hole, and the support wall surrounds a second light passing hole.

[0010] Preferably, the second lens is supported by the support wall.

[0011] Preferably, at least one fourth lens is arranged between the first lens and the third lens.

[0012] Preferably, the optical lens comprises at least two glass lenses.

[0013] Preferably, a light shielding piece is arranged between at least two adjacent lenses.

[0014] Preferably, a chamfer is arranged around the surface of the second lens close to the image side. Advantages

[0015] Compared with the prior art, the capsule endoscope optical lens assembly provided by the present application comprises: an optical lens, an imaging surface arranged on the image side of the optical lens, and a filter arranged between the imaging surface and the optical lens, the optical lens comprises: a lens barrel and a plurality of lenses arranged in sequence from the object side to the image side in the lens barrel, the lenses comprise a first lens close to the object side, a second lens close to the image side, and at least one third lens arranged between the first lens and the second lens, the second lens is a glass lens, and the lens barrel comprises an annular barrel wall, and the first lens is fixedly connected to the barrel wall by black glue. The present application sets the lens closest to the image side as a glass lens, so that the imaging performance of the entire capsule endoscope optical lens assembly is better, and the aperture and the field of view can be larger. Meanwhile, the lens closest to the object side is fixed to the lens barrel by black glue, so that the compression ring component is omitted, stray light can be effectively blocked, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a cross-sectional view of the capsule endoscope optical lens assembly of the present application. BEST MODE FOR CARRYING OUT THE INVENTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0018] The optical lens assembly of the capsule endoscope is different from the conventional optical lens for mobile phones, the lens closest to the object side is larger than other lenses, so the overall structure is different from the conventional optical lens for mobile phones.

[0019] The utility model provides a kind of optical lens assembly 100 of capsule endoscope, as shown in figure 1, the optical lens assembly 100 of capsule endoscope includes: optical lens 1, imaging surface 2 being arranged in the one side of optical lens 1 and filter 3 being arranged between imaging surface 2 and optical lens 1.The filter 3 can be infrared filter, so that the optical lens assembly 100 of capsule endoscope can filter out infrared light, prevent infrared light from reaching imaging surface 2 and cause interference to normal visible light imaging, to improve imaging quality.

[0020] The optical lens 1 has object side and image side oppositely arranged along optical axis direction, and the optical lens 1 includes: lens barrel 4 and multiple lenses 5 arranged in sequence from the object side to the image side and received in the lens barrel 4.

[0021] The lens barrel 4 includes annular barrel wall 41 and support wall 42 formed by bending and extending from one end of the barrel wall 41 close to the image side, and the one end of the barrel wall 41 close to the object side is surrounded to form first light hole 43, and the support wall 42 is surrounded to form second light hole 44.

[0022] The lens 5 includes at least first lens 51 close to the object side, second lens 52 close to the image side and at least one third lens 53 arranged between the first lens 51 and the second lens 52. In the embodiment, the lens 5 includes four lenses, specifically, the first lens 51, the fourth lens 54, the third lens 53 and the second lens 52 are arranged in sequence from the object side to the image side, and the outer diameter of the first lens 51, the outer diameter of the fourth lens 54, the outer diameter of the third lens 53 and the outer diameter of the second lens 52 gradually decrease. In other embodiments, the lens 5 can also include other number of lenses according to actual needs.

[0023] In the embodiment, the first lens 51 is the lens closest to the object side, and the first lens 51 is fixedly connected with the barrel wall 41 of the lens barrel 4 by black glue 6. Such a fixing mode can omit the pressure ring component for fixing the lens, effectively reduce the size of the head of the optical lens, effectively block stray light, and reduce the cost. The second lens 52 is a glass lens, and the second lens 52 is supported on the support wall 42. The second lens 52 closest to the image side is arranged as a glass lens, so that the optical performance of the optical lens 1 is better under the same size, and the aperture and the field of view can be larger. The surface of the second lens 52 close to the image side is provided with a chamfer 521 around the periphery, and the chamfer 521 can avoid interference with the lens barrel 4 during assembly of the lens, and is beneficial to assembly.

[0024] The first lens 51 comprises an optical part 511 in the middle and a bearing part 512 arranged around the optical part 511, the imaging surface 2 is rectangular, and the effective diameter of the optical part 511 is greater than the length of the diagonal line of the imaging surface 2.

[0025] Preferably, the optical lens 1 comprises at least two glass lenses. Since the plastic lens can reduce the mass of the optical lens 1, the burden of the driving mechanism in the optical lens 1 is also reduced, the volume of the driving mechanism is beneficial to be reduced, and the volume of the optical lens assembly can be further reduced, which meets the market trend of miniaturization of the lens assembly. The optical performance of the glass lens is more excellent, and therefore, it is important to reasonably configure the number of plastic lenses and the number of glass lenses.

[0026] The optical lens 10 of the utility model further comprises a light shielding piece 7 arranged between two adjacent lenses 5, the light shielding piece 7 can adjust the air interval between the two adjacent lenses according to the thickness of the light shielding piece 7, and can also absorb stray light.

[0027] Compared with the related art, the capsule endoscope optical lens assembly has the advantages that the lens closest to the image side is arranged as a glass lens, so that the imaging performance of the whole capsule endoscope optical lens assembly is better, and the aperture and the field of view angle can be larger; meanwhile, the lens closest to the object side is fixed with the lens barrel through black glue, so that the pressing ring component is omitted, stray light can be effectively blocked, and the cost is reduced.

[0028] The above is only the embodiment of the present application, and it should be pointed out that those skilled in the art can make improvements without departing from the inventive concept of the present application, but these all belong to the protection scope of the present application.

Claims

1. A capsule endoscope optical lens assembly, comprising: An optical lens, an imaging surface arranged on an image side of the optical lens, and a filter arranged between the imaging surface and the optical lens, characterized in that the optical lens comprises a lens barrel and a plurality of lenses arranged in sequence from an object side to the image side in the lens barrel, the lenses comprising a first lens close to the object side, a second lens close to the image side, and at least one third lens arranged between the first lens and the second lens, the second lens being a glass lens, the lens barrel comprising an annular barrel wall, and the first lens and the barrel wall being fixedly connected by black glue.

2. The capsule endoscope optical lens assembly according to claim 1, wherein, The first lens comprises an optical portion in the middle and a bearing portion arranged around the optical portion, and an effective diameter of the optical portion is greater than a length of an opposite angle of the imaging surface.

3. The capsule endoscope optical lens assembly according to claim 2, wherein, In a direction from the object side to the image side, an outer diameter of the first lens, an outer diameter of the third lens, and an outer diameter of the second lens gradually decrease.

4. The capsule endoscope optical lens assembly of claim 1, wherein, The lens barrel further comprises a support wall formed by bending and extending from one end of the barrel wall close to the image side, and the barrel wall close to the object side surrounds a first light passing hole, and the support wall surrounds a second light passing hole.

5. The capsule endoscope optical lens assembly according to claim 4, wherein, The second lens is supported by the support wall.

6. The capsule endoscopy optical lens assembly of claim 1, wherein, At least one fourth lens is arranged between the first lens and the third lens.

7. The capsule endoscopy optical lens assembly of claim 1, wherein, The optical lens comprises at least two glass lenses.

8. The capsule endoscopy optical lens assembly of claim 1, wherein, At least two adjacent lenses are provided with light shielding pieces.

9. The capsule endoscopy optical lens assembly of claim 1, wherein: A surface close to the image side of the second lens is provided with a chamfered corner.

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