CN220271647U - Miniature medical endoscope lens - Google Patents
Miniature medical endoscope lens Download PDFInfo
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- CN220271647U CN220271647U CN202223507382.6U CN202223507382U CN220271647U CN 220271647 U CN220271647 U CN 220271647U CN 202223507382 U CN202223507382 U CN 202223507382U CN 220271647 U CN220271647 U CN 220271647U
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- medical endoscope
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- miniature medical
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- 238000003384 imaging method Methods 0.000 claims abstract description 6
- 239000011521 glass Substances 0.000 claims abstract description 4
- 230000003287 optical effect Effects 0.000 claims description 22
- 239000002775 capsule Substances 0.000 abstract description 3
- 230000004075 alteration Effects 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 208000008918 voyeurism Diseases 0.000 description 1
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Abstract
A miniature medical endoscope lens is characterized in that a first lens (L1), a second lens (L2), a diaphragm (STO), a third lens (L3) and a glass sheet are arranged from an object side surface to an image side surface in sequence; the first lens (L1) is a negative lens, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens (L2) is a positive lens, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the third lens (L3) is a positive lens, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; and the focal length of each lens element satisfies the following relationship: -1.1< f1/f < -0.7; (1) 1.3< f2/f <1.7; (2) 1.5< f3/f <2.0; (3) Wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, and f is the effective focal length of the miniature medical endoscope lens. The miniature medical endoscope lens has the advantages of large angle, small volume, good imaging definition, good depth of field and capability of being used for a capsule endoscope lens.
Description
[ field of technology ]
The utility model relates to the technical field of medical treatment, and comprises a miniature medical endoscope lens.
[ background Art ]
Medical endoscopes are one of the important tools for human peeping and treatment of organs in the human body. With the updating of medical equipment, the demand for miniature wound operation with human injury controlled in a smaller range is greatly increased, and the application of the endoscope technology has more and more significance.
[ utility model ]
The utility model provides a miniature medical endoscope lens which can be applied to the inspection of a common endoscope and the inspection of a capsule endoscope, and can have smaller volume while ensuring a larger view field angle. The utility model is realized by the following technical scheme:
a miniature medical endoscope lens is characterized in that a first lens (L1), a second lens (L2), a diaphragm (STO), a third lens (L3) and a glass sheet (CG) are arranged in sequence from an object side surface to an image side surface. The first lens (L1) is a negative lens, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface. The second lens (L2) is a positive lens, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface. The third lens (L3) is a positive lens, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface.
And the focal length of each lens element satisfies the following relationship:
-1.1<f1/f<-0.7； (1)
1.3<f2/f<1.7； (2)
1.5<f3/f<2.0； (3)
wherein f1 is an effective focal length of the first lens (L1), f2 is an effective focal length of the second lens (L2), f3 is an effective focal length of the third lens (L3), and f is an effective focal length of the miniature medical endoscope lens.
The miniature medical endoscope lens is characterized in that the first lens (L1), the second lens (L2) and the third lens (L3) are plastic aspheric lenses and meet the following relational expression:
0.5＜T12/f＜0.8； (4)
0.1＜T23/f＜0.3； (5)
wherein T12 is an air gap between the first lens (L1) and the second lens (L2) on the optical axis, T23 is an air gap between the second lens (L2) and the third lens (L3) on the optical axis, and f is an effective focal length of the miniature medical endoscope lens.
The miniature medical endoscope lens is characterized in that:
0.1<f/TTL<0.3； (6)
wherein f is the effective focal length of the miniature medical endoscope lens, and TTL is the distance from the object side surface of the first lens of the miniature medical endoscope lens to the imaging surface on the optical axis.
The miniature medical endoscope lens is characterized in that:
0.1<CT1/∑CT<0.3； (7)
0.2<CT2/∑CT<0.5； (8)
0.2<CT3/∑CT<0.4； (9)
wherein, CT1, CT2, CT3 are lens thicknesses of the first lens (L1), the second lens (L2), and the third lens (L3) on the optical axis, respectively, and Σct is a sum of lens thicknesses of the first lens (L1), the second lens (L2), and the third lens (L3) on the optical axis.
The miniature medical endoscope lens is characterized in that:
2.5<Dr9i/f<2.9； (10)
wherein Dr9i is an on-axis distance from an image side surface to an image surface of the third lens (L3), and f is an effective focal length of the miniature medical endoscope lens.
The miniature medical endoscope lens is characterized by meeting the following relation:
0<T2-T1<0.35； (11)
-0.2<T3-T2<0； (12)
wherein, CT1, CT2, CT3 are the lens thickness of the first lens (L1), the second lens (L2), and the third lens (L3) on the optical axis, respectively.
Compared with the prior art, the three lenses of the miniature medical endoscope lens are all made of plastic materials, so that the miniature medical endoscope lens is low in cost and can be used as a capsule endoscope lens. Compared with the prior endoscope lens, the lens has the advantages of large view field angle, relatively small size and good depth of field, so that the lens can be better suitable for actual use scenes.
[ description of the drawings ]
Fig. 1 is a cross-sectional view showing the overall structure of the miniature medical endoscope lens.
Fig. 2 is an aberration diagram of the miniature medical endoscope lens.
Fig. 3 is a distortion diagram of the miniature medical endoscope lens.
[ detailed description ] of the utility model
The following describes specific embodiments of the present utility model in detail.
As shown in fig. 1, a miniature medical endoscope lens includes, in order from an object side surface to an image side surface, a first lens (L1), a second lens (L2), a Stop (STO), a third lens (L3), and a glass sheet (CG). The first lens (L1) is a negative lens, and is made of plastic, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface. The second lens (L2) is a positive lens, and is made of plastic, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface. The third lens (L3) is a positive lens, and is made of plastic, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface. The focal length of each lens element of the miniature medical endoscope lens of the present embodiment satisfies the following relation:
-1.1<f1/f<-0.7； (1)
1.3<f2/f<1.7； (2)
1.5<f3/f<2.0； (3)
wherein f1 is the effective focal length of the first lens (L1), f2 is the effective focal length of the second lens (L2), f3 is the effective focal length of the third lens (L3), and f is the effective focal length of the miniature medical endoscope lens.
In this embodiment, the first lens (L1), the second lens (L2) and the third lens (L3) are plastic aspheric lenses, so that aberration of each field of view can be effectively corrected, and overall imaging quality is improved. The miniature medical endoscope lens of the present embodiment satisfies the following relation:
0.5＜T12/f＜0.8； (4)
0.1＜T23/f＜0.3； (5)
wherein T12 is the air gap of the first lens (L1) and the second lens (L2) on the optical axis, T23 is the air gap of the second lens (L2) and the third lens (L3) on the optical axis, and f is the effective focal length of the miniature medical endoscope lens.
The miniature medical endoscope lens of the present embodiment also satisfies the following relation:
0.1<f/TTL<0.3； (6)
wherein f is the effective focal length of the miniature medical endoscope lens, and TTL is the distance from the object side surface of the first lens (L1) of the miniature medical endoscope lens to the imaging surface on the optical axis. The adjustment of the optical powers of the individual lenses compensates for one another, which is advantageous for reducing the overall length and ensures a large angle of view on this basis.
The following relation is also satisfied in the miniature medical endoscope lens of the present embodiment:
0.1<CT1/∑CT<0.3； (7)
0.2<CT2/∑CT<0.5； (8)
0.2<CT3/∑CT<0.4； (9)
wherein, CT1, CT2, CT3 are lens thicknesses of the first lens (L1), the second lens (L2), and the third lens (L3) on the optical axis, respectively, and ΣCT is a sum of lens thicknesses of the first lens (L1), the second lens (L2), and the third lens (L3) on the optical axis.
In the miniature medical endoscope lens of the present embodiment, the following relation is satisfied:
2.5<Dr9i/f<2.9； (10)
where Dr9i is the on-axis distance from the image side surface to the image surface of the third lens (L3), and f is the effective focal length of the miniature medical endoscope lens.
In the miniature medical endoscope lens of the present embodiment, the following relational expression is satisfied:
0<CT2-CT1<0.35； (11)
-0.2<T3-T2<0； (12)
wherein, CT1, CT2, CT3 are the lens thickness of the first lens (L1), the second lens (L2), the third lens element (L3) on the optical axis respectively. The control of the thickness of each lens is beneficial to correcting and mutually compensating aberration, reducing tolerance sensitivity and reducing difficulty in the forming process, and is beneficial to reducing the total length of the lens and realizing miniaturization of the lens.
The miniature medical endoscope lens has a larger field angle and smaller volume, and meanwhile, the depth of field is better, and the imaging resolution is higher.
Fig. 2 and 3 show some optical parameters of the miniature medical endoscope lens of the present embodiment. In the lens data table of this embodiment, the units of radius and thickness are mm, and S (solid line) and T (broken line) in the distortion map represent sagittal image surfaces and meridional image surfaces, respectively.
The following table is a lens data table of the present embodiment
Table 1 is a lens data table for an endoscope lens
TABLE 1
Table 2 shows the ratio ranges of the aspherical sagittal heights of the first lens L1 and the second lens L2 to the radius R.
TABLE 2
Table 3 shows the ratio ranges of the aspherical sagittal heights of the third lens L3 to the radius R.
TABLE 3 Table 3
Claims (6)
1. A miniature medical endoscope lens, which is characterized in that a first lens (L1), a second lens (L2), a diaphragm (STO), a third lens (L3) and a glass sheet (CG) are arranged from an object side surface to an image side surface in sequence; the first lens (L1) is a negative lens, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens (L2) is a positive lens, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the third lens (L3) is a positive lens, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
and the focal length of each lens element satisfies the following relationship:
-1.1<f1/f<-0.7； (1)
1.3<f2/f<1.7； (2)
1.5<f3/f<2.0； (3)
wherein f1 is an effective focal length of the first lens (L1), f2 is an effective focal length of the second lens (L2), f3 is an effective focal length of the third lens (L3), and f is an effective focal length of the miniature medical endoscope lens.
2. A miniature medical endoscope lens according to claim 1, characterized in that said first lens (L1), second lens (L2) and third lens (L3) are plastic aspherical lenses and satisfy the following relation:
0.5＜T12/f＜0.8； (4)
0.1＜T23/f＜0.3； (5)
wherein T12 is an air gap between the first lens (L1) and the second lens (L2) on an optical axis;
t23 is the air gap between the second lens (L2) and the third lens (L3) on the optical axis, and f is the effective focal length of the miniature medical endoscope lens.
3. A miniature medical endoscope lens according to claim 1 or claim 2 and wherein:
0.1<f/TTL<0.3； (6)
wherein f is the effective focal length of the miniature medical endoscope lens, and TTL is the distance from the object side surface of the first lens of the miniature medical endoscope lens to the imaging surface on the optical axis.
4. A miniature medical endoscope lens according to claim 1 or claim 2 and wherein:
0.1<CT1/∑CT<0.3； (7)
0.2<CT2/∑CT<0.5；(8)
0.2<CT3/∑CT<0.4；(9)
wherein, CT1, CT2, CT3 are lens thicknesses of the first lens (L1), the second lens (L2), and the third lens (L3) on the optical axis, respectively, and Σct is a sum of lens thicknesses of the first lens (L1), the second lens (L2), and the third lens (L3) on the optical axis.
5. A miniature medical endoscope lens according to claim 1 or claim 2 and wherein:
2.5<Dr9i/f<2.9； (10)
wherein Dr9i is the on-axis distance from the image side surface to the image surface of the third lens (L3); f is the effective focal length of the miniature medical endoscope lens.
6. A miniature medical endoscope lens according to claim 1 and wherein the following relationship is satisfied:
0<T2-T1<0.35； (11)
-0.2<T3-T2<0； (12)
wherein T1 is the distance between the first lens element object-side surface and the first lens element image-side surface on the optical axis, T2 is the distance between the second lens element object-side surface and the second lens element image-side surface on the optical axis, and T3 is the distance between the third lens element object-side surface and the third lens element image-side surface on the optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223507382.6U CN220271647U (en) | 2022-12-28 | 2022-12-28 | Miniature medical endoscope lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223507382.6U CN220271647U (en) | 2022-12-28 | 2022-12-28 | Miniature medical endoscope lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220271647U true CN220271647U (en) | 2023-12-29 |
Family
ID=89314248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223507382.6U Active CN220271647U (en) | 2022-12-28 | 2022-12-28 | Miniature medical endoscope lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220271647U (en) |
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2022
- 2022-12-28 CN CN202223507382.6U patent/CN220271647U/en active Active
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