Capsule endoscope optical lens unit

Abstract

The present invention provides a capsule endoscope optical lens unit, which includes an optical lens, an imaging surface provided on the image side of the optical lens, and an optical filter provided between the imaging surface and the optical lens. The optical lens includes a lens barrel and a plurality of lenses arranged sequentially from the object side to the image side housed within the lens barrel. The lens includes a first lens closer to the object side, a second lens closer to the image side, and at least one third lens provided between the first and second lenses. The second lens is a glass lens. The lens barrel includes an annular cylindrical wall. The first lens and the cylindrical wall are fixedly connected by black adhesive. The lens closest to the image side of the capsule endoscope optical lens unit of the present invention is made of glass, improving the performance of the optical system of the lens unit, increasing the aperture and field of view, while the lens closest to the object side is fixed to the lens barrel by black adhesive, eliminating the need for a retaining ring member, reducing the head size of the optical lens, effectively blocking stray light, and lowering costs.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of optical imaging, and in particular to a capsule endoscope optical lens unit. BACKGROUND ART

[0002] In the prior art, a capsule endoscope optical lens unit generally employs several pure plastic lenses, which are assembled into a lens barrel by stacking. Since the optical system has a relatively large viewing angle, the aperture of the first lens close to the object side is much larger than that of the subsequent several lenses, which causes the outer dimension of the lenses to be relatively large. In the prior art, the assembly sequence of the lenses starts from the first lens close to the image side, which can reduce the outer dimension of the lenses on the side close to the image side. However, for the dimension on the side close to the object side, a pressing ring is additionally required to fix the lenses, and at the same time, the pressing ring needs to block stray light, so that the dimension of the end of the capsule endoscope optical lens unit close to the object side is still limited.

[0003] In the prior art, pure plastic lenses are adopted, and under the condition that the outer dimension is limited, none of the imaging performance, aperture and viewing angle can be further improved. At the same time, due to the existence of the pressing ring, the dimension of the front end face of the capsule endoscope optical lens unit is limited and cannot be further reduced.

[0004] Therefore, there is a need to provide a capsule endoscope optical lens unit to solve the above technical problems. SUMMARY OF THE INVENTION

[0005] An objective of the present invention is to provide a capsule endoscope optical lens unit, which solves the problems of relatively large dimension at the object side end and high cost of the conventional capsule endoscope optical lens unit.

[0006] To achieve the above objective, the present invention provides a capsule endoscope optical lens unit. The capsule endoscope optical lens unit includes an optical lens, an imaging plane provided on the image side of the optical lens, and an optical filter provided between the imaging plane and the optical lens. The optical lens includes a lens barrel and a plurality of lenses arranged sequentially from the object side to the image side housed within the lens barrel. The lens includes a first lens closer to the object side, a second lens closer to the image side, and at least one third lens provided between the first lens and the second lens. The second lens is a glass lens. The lens barrel includes an annular cylindrical wall. The first lens and the cylindrical wall are fixedly connected by black adhesive.

[0007] Preferably, the first lens includes an intermediate optical section and a support section surrounding the optical section, wherein the effective diameter of the optical section is greater than the length of the diagonal of the image-forming plane.

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

[0009] Preferably, the lens barrel further includes a support wall formed by curving and extending from one end of the barrel wall closer to the image side, wherein the end of the barrel wall closer to the object side is provided surrounding a first light-transmitting hole, and the support wall is provided surrounding a second light-transmitting hole.

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

[0011] Preferably, at least one 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 plate is provided between at least two adjacent lenses.

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

[0015] Compared to related technologies, the capsule endoscope optical lens unit provided by the present invention includes an optical lens, an imaging surface provided on the image side of the optical lens, and an optical filter provided between the imaging surface and the optical lens. The optical lens includes a lens barrel and a plurality of lenses arranged sequentially from the object side to the image side housed within the lens barrel. The lens includes a first lens closer to the object side, a second lens closer to the image side, and at least one third lens provided between the first and second lenses. The second lens is a glass lens. The lens barrel includes an annular cylindrical wall. The first lens and the cylindrical wall are fixedly connected by black adhesive. By setting the lens closest to the image side as a glass lens, the present invention improves the overall imaging performance of the capsule endoscope optical lens unit, and allows for a wider aperture and field of view. At the same time, the lens closest to the object side is fixed to the lens barrel by black adhesive, eliminating the need for a retaining ring member, effectively blocking stray light, and reducing costs. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic cross-sectional view of the capsule endoscope optical lens unit of the present invention. [Modes for carrying out the invention]

[0017] The following clearly and completely describes the technical solutions in the embodiments of the present invention, along with the accompanying drawings. Clearly, the embodiments described are only a selection of the embodiments of the present invention, not all of them. All other embodiments obtained by an ordinary artist in the art without creative work based on the embodiments of the present invention are all within the scope of the protection of the present invention.

[0018] Unlike ordinary mobile phone lenses, the optical lens unit of a capsule endoscope has a lens closest to the object that is larger than the other lenses, and its overall structure is quite different from that of an ordinary mobile phone lens.

[0019] The present invention provides a capsule endoscope optical lens unit 100. As shown in Figure 1, the capsule endoscope optical lens unit 100 includes an optical lens 1, an imaging surface 2 provided on one side of the optical lens 1, and an optical filter 3 provided between the imaging surface 2 and the optical lens 1. The optical filter 3 may be an infrared filter. This allows the capsule endoscope optical lens unit 100 to filter infrared light, preventing infrared light from reaching the imaging surface 2 and interfering with normal visible light imaging, thereby improving image quality.

[0020] The optical lens 1 is arranged with the object side and the image side facing each other in the optical axis direction. The optical lens 1 includes a lens barrel 4 and a plurality of lenses 5 housed within the lens barrel 4, arranged sequentially from the object side to the image side.

[0021] The lens barrel 4 includes an annular cylindrical wall 41 and a support wall 42 formed by curving and extending from one end of the cylindrical wall 41 closer to the image side. The end of the cylindrical wall 41 closer to the object side is provided surrounding a first light-transmitting hole 43, and the support wall 42 is provided surrounding a second light-transmitting hole 44.

[0022] The lens 5 includes at least a first lens 51 closer to the object, a second lens 52 closer to the image, and at least one third lens 53 provided between the first lens 51 and the second lens 52. In this 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, arranged sequentially in a direction from the object side toward the image side, with the outer diameters of the first lens 51, the fourth lens 54, the third lens 53, and the second lens 52 gradually decreasing. In other embodiments, the lens 5 may include a different number of lenses as required by practical needs.

[0023] In this embodiment, the first lens 51 is the lens closest to the object side, and the first lens 51 and the barrel wall 41 of the lens barrel 4 are fixedly connected by a black adhesive 6. Such a fixing method can omit the step of fixing the lens using a pressing member, effectively reduce the head size of the optical lens, effectively block stray light, and reduce costs. The second lens 52 is a glass lens, the second lens 52 is supported by the support wall 42, the second lens 52 closest to the image side is configured as a glass lens, which can improve the optical performance of the optical lens 1 and increase the aperture and field of view under the same external dimensions. A chamfer 521 is provided on the periphery of the surface of the second lens 52 close to the image side, and the structure of the chamfer 521 can avoid interference with the lens barrel 4 during lens assembly, which is beneficial to assembly.

[0024] The first lens 51 includes an optical portion 511 located in the middle, and a support portion 512 provided to surround the optical portion 511. The imaging surface 2 is rectangular, and the effective diameter of the optical portion 511 is larger than the diagonal length of the imaging surface 2.

[0025] Preferably, the optical lens 1 includes at least two glass lenses. Since a lens made of plastic material can reduce the mass of the optical lens 1, it reduces the load on the driving mechanism in the optical lens 1, which is beneficial to reducing the volume of the driving mechanism, can further reduce the volume of the optical lens unit, conforms to the market trend of miniaturization of lens modules, and the optical performance of glass lenses is more excellent, so it is important to rationally arrange 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 plate 7 disposed between two adjacent lenses 5, and the light shielding plate 7 can adjust the air gap between the two adjacent lenses by its own thickness, and at the same time, can also perform the function of absorbing stray light.

[0027] Compared to related technologies, the capsule endoscope optical lens unit provided by the present invention includes an optical lens, an imaging surface provided on the image side of the optical lens, and an optical filter provided between the imaging surface and the optical lens. The optical lens includes a lens barrel and a plurality of lenses arranged sequentially from the object side to the image side housed within the lens barrel. The lens includes a first lens closer to the object side, a second lens closer to the image side, and at least one third lens provided between the first and second lenses. The second lens is a glass lens. The lens barrel includes an annular cylindrical wall. The first lens and the cylindrical wall are fixedly connected by black adhesive. By setting the lens closest to the image side as a glass lens, the present invention improves the overall imaging performance of the capsule endoscope optical lens unit, and allows for a wider aperture and field of view. At the same time, the lens closest to the object side is fixed to the lens barrel by black adhesive, eliminating the need for a retaining ring member, effectively blocking stray light, and reducing costs.

[0028] The above descriptions are merely embodiments of the present invention, and it should be noted that those skilled in the art can make further improvements without departing from the original spirit of the invention, but all of these improvements fall within the scope of protection of the present invention.

Claims

1. Capsule endoscope optical lens unit, The capsule endoscope optical lens unit includes an optical lens, an imaging surface provided on the image side of the optical lens, and an optical filter provided between the imaging surface and the optical lens. The optical lens unit for a capsule endoscope is characterized in that the optical lens includes a lens barrel and a plurality of lenses arranged sequentially from the object side to the image side housed within the lens barrel, the lens includes a first lens close to the object side, a second lens close to the image side, and at least one third lens provided between the first lens and the second lens, the second lens being a glass lens, the lens barrel including an annular cylindrical wall, and the first lens and the cylindrical wall being fixedly connected by black adhesive.

2. The capsule endoscope optical lens unit according to claim 1, characterized in that the first lens includes an optical part located in the middle and a support part provided so as to surround the optical part, and the effective diameter of the optical part is greater than the length of the diagonal of the image-forming plane.

3. The capsule endoscope optical lens unit according to claim 2, characterized in that 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 the direction from the object side to the image side.

4. The capsule endoscope optical lens unit according to claim 1, wherein the lens barrel further includes a support wall formed by curving and extending from one end of the barrel wall closer to the image side, the end of the barrel wall closer to the object side is provided surrounding a first light-transmitting hole, and the support wall is provided surrounding a second light-transmitting hole.

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

6. The capsule endoscope optical lens unit according to claim 1, characterized in that at least one fourth lens is provided between the first lens and the third lens.

7. The capsule endoscope optical lens unit according to claim 1, characterized in that the optical lens includes at least two glass lenses.

8. The capsule endoscope optical lens unit according to claim 1, characterized in that a light-shielding plate is provided between at least two adjacent lenses.

9. The capsule endoscope optical lens unit according to claim 1, characterized in that a chamfer is provided around the surface of the second lens that is close to the image side.

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