Optical lens assembly of capsule endoscope

Abstract

The utility model provides an optical lens assembly of a capsule endoscope, 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, and the optical lens comprises a lens barrel and a plurality of lenses which are accommodated in the lens barrel and are sequentially arranged from the object side to the image side, the lens comprises 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, the lens barrel comprises an annular barrel wall, and the first lens is fixedly connected with the barrel wall through black glue. According to the capsule endoscope optical lens assembly, the lens closest to the image side is made of glass, the optical system performance of the lens assembly is better, the aperture and the field angle are larger, meanwhile, the lens closest to the object side is fixed to the lens barrel through black glue, a pressing ring part is omitted, the size of the head of the optical lens is reduced, stray light is effectively blocked, and the service life of the lens assembly is prolonged. The cost is low.

Description

Technical field

[0001] The utility model relates to the technical field of optical imaging, in particular to an optical lens assembly of a capsule endoscope. [Background Technology]

[0002] In the prior art, the optical lens assembly of a capsule endoscope generally uses several pure plastic lenses, which are assembled into a lens barrel by stacking. Since the optical system has a large field of view, the aperture of the first lens close to the object side is much larger than that of the subsequent lenses, resulting in a larger external size of the lens. In the prior art, the lens assembly order is to start from the first lens close to the image side, which can reduce the external size of the lens close to the image side. However, the size of the lens close to the object side is still limited due to the addition of a pressure ring to fix the lens, and the pressure ring needs to block stray light.

[0003] The existing technology uses pure plastic lenses. Due to the limitation of external dimensions, its imaging performance, aperture, and field of view cannot be improved. At the same time, due to the existence of the pressure ring, the front end surface size of the capsule endoscope optical lens assembly is limited and cannot be made smaller.

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

[0005] The purpose of the utility model is to provide a capsule endoscope optical lens assembly, aiming to solve the problems of large object side end size and high cost of traditional capsule endoscope optical lens assemblies.

[0006] In order to achieve the above-mentioned objectives, the present invention provides a capsule endoscope optical lens assembly, which includes: 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 includes: a lens barrel and a plurality of lenses accommodated in the lens barrel and arranged in sequence from the object side to the image side. The lenses include 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. The lens barrel includes an annular barrel wall, and the first lens and the barrel wall are fixedly connected by black glue.

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

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

[0009] Preferably, the lens barrel further comprises a supporting wall formed by bending and extending from one end of the barrel wall close to the image side, the end of the barrel wall close to the object side is configured to form a first light hole, and the supporting wall is configured to form a second light hole.

[0010] Preferably, the second lens is supported on the supporting wall.

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

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

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

[0014] Preferably, a periphery of a surface of the second lens close to the image side is chamfered.

[0015] Compared with the related art, the capsule endoscope optical lens assembly provided by the present invention includes: 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 includes: a lens barrel and a plurality of lenses accommodated in the lens barrel and arranged in sequence from the object side to the image side, the lenses include 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, the lens barrel includes an annular barrel wall, and the first lens and the barrel wall are fixedly connected by black glue. The present invention improves the imaging performance of the entire capsule endoscope optical lens assembly by setting the lens closest to the image side to a glass lens, and the aperture and field of view angle can be made larger; at the same time, the lens closest to the object side is fixed to the lens barrel by black glue, eliminating the pressure ring component, which can effectively block stray light and reduce costs.

Brief Description of the Drawings

[0016] Figure 1 The figure is a cross-sectional schematic diagram of the optical lens assembly of the capsule endoscope of the present invention. [Specific implementation method]

[0017] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

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

[0019] The utility model provides a capsule endoscope optical lens assembly 100, such as Figure 1 As shown, the capsule endoscope optical lens assembly 100 includes: an optical lens 1, an imaging surface 2 provided on one side of the optical lens 1, and a filter 3 provided between the imaging surface 2 and the optical lens 1. The filter 3 may be an infrared filter, so that the capsule endoscope optical lens assembly 100 can filter out infrared light, preventing infrared light from reaching the imaging surface 2 and interfering with normal visible light imaging, thereby improving imaging quality.

[0020] The optical lens 1 has an object side and an image side oppositely arranged along an optical axis. The optical lens 1 includes a lens barrel 4 and a plurality of lenses 5 accommodated in the lens barrel 4 and arranged in sequence from the object side to the image side.

[0021] The lens barrel 4 includes an annular barrel wall 41 and a support wall 42 bent and extended from one end of the barrel wall 41 close to the image side. The end of the barrel wall 41 close to the object side is configured to form a first light hole 43, and the support wall 42 is configured to form a second light hole 44.

[0022] The lens 5 includes at least a first lens 51 near the object side, a second lens 52 near the image side, and at least one third lens 53 disposed between the first lens 51 and the second lens 52. In this embodiment, the lens 5 includes four lenses, specifically, a first lens 51, a fourth lens 54, a third lens 53, and a second lens 52, arranged in sequence from the object side to the image side. The outer diameters of the first lens 51, the fourth lens 54, the third lens 53, and the second lens 52 gradually decrease. In other embodiments, the lens 5 may also include other numbers of lenses as needed.

[0023] In this embodiment, the first lens 51 is the lens closest to the object side. The first lens 51 is fixedly connected to the barrel wall 41 of the lens barrel 4 by black glue 6. Such a fixing method can eliminate the need for a pressure ring component to fix the lens, effectively reducing the size of the head of the optical lens, while also effectively blocking stray light and reducing costs. The second lens 52 is a glass lens, and the second lens 52 is supported on the supporting wall 42. The second lens 52 closest to the image side is set as a glass lens. This can improve the optical performance of the optical lens 1 under the same overall dimensions, and the aperture and field angle can be made larger. The surface periphery of the second lens 52 close to the image side is provided with a chamfer 521. The chamfer 521 structure can avoid interference with the lens barrel 4 when assembling the lens, which is conducive to assembly.

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

[0025] Preferably, the optical lens 1 includes 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, which is conducive to reducing the volume of the driving mechanism, and further reducing the volume of the optical lens assembly, which is in line with the market trend of miniaturization of lens assemblies. The optical performance of glass lenses is better. 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 present invention further includes a light shielding sheet 7 disposed between two adjacent lenses 5. The light shielding sheet 7 can adjust the air gap between the two adjacent lenses according to its own thickness, and can also absorb stray light.

[0027] Compared with the related art, the capsule endoscope optical lens assembly provided by the present invention includes: 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 includes: a lens barrel and a plurality of lenses accommodated in the lens barrel and arranged in sequence from the object side to the image side, the lenses include 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, the lens barrel includes an annular barrel wall, and the first lens and the barrel wall are fixedly connected by black glue. The present invention improves the imaging performance of the entire capsule endoscope optical lens assembly by setting the lens closest to the image side to a glass lens, and the aperture and field of view angle can be made larger; at the same time, the lens closest to the object side is fixed to the lens barrel by black glue, eliminating the pressure ring component, which can effectively block stray light and reduce costs.

[0028] The above is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements are all within the scope of protection of the present invention.

Claims

1. A capsule endoscope optical lens assembly, comprising: 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, characterized in that the optical lens includes: a lens barrel and a plurality of lenses accommodated in the lens barrel and arranged in sequence from the object side to the image side, the lenses including 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, the lens barrel includes an annular barrel wall, and the first lens and the barrel wall are fixedly connected by black glue.

2. The capsule endoscope optical lens assembly according to claim 1, characterized in that: The first lens includes an optical portion located in the middle and a supporting portion arranged around the optical portion. The effective diameter of the optical portion is greater than the length of the diagonal line of the imaging surface.

3. The capsule endoscope optical lens assembly according to claim 2, characterized in that: Along a direction from the object side to the image side, outer diameters of the first lens, the third lens, and the second lens gradually decrease.

4. The capsule endoscope optical lens assembly according to claim 1, characterized in that: 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, the end of the barrel wall close to the object side is configured to form a first light hole, and the support wall is configured to form a second light hole.

5. The capsule endoscope optical lens assembly according to claim 4, characterized in that: The second lens is supported by the supporting wall.

6. The capsule endoscope optical lens assembly according to claim 1, characterized in that: At least one fourth lens is disposed between the first lens and the third lens.

7. The capsule endoscope optical lens assembly according to claim 1, characterized in that: The optical lens comprises at least two glass lenses.

8. The capsule endoscope optical lens assembly according to claim 1, characterized in that: A light shielding sheet is provided between at least two adjacent lenses.

9. The capsule endoscope optical lens assembly according to claim 1, characterized in that: A periphery of a surface of the second lens close to the image side is chamfered.

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