CN220289939U - Capsule endoscope lens - Google Patents
Capsule endoscope lens Download PDFInfo
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- CN220289939U CN220289939U CN202323252859.5U CN202323252859U CN220289939U CN 220289939 U CN220289939 U CN 220289939U CN 202323252859 U CN202323252859 U CN 202323252859U CN 220289939 U CN220289939 U CN 220289939U
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- 239000002775 capsule Substances 0.000 title claims abstract description 63
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 210000001747 pupil Anatomy 0.000 claims description 8
- 101150086656 dim1 gene Proteins 0.000 claims description 7
- 101100279078 Arabidopsis thaliana EFL2 gene Proteins 0.000 claims description 6
- 101100279079 Arabidopsis thaliana EFL3 gene Proteins 0.000 claims description 6
- 102100031417 Elongation factor-like GTPase 1 Human genes 0.000 claims description 6
- 102100033940 Ephrin-A3 Human genes 0.000 claims description 6
- 102100033946 Ephrin-B1 Human genes 0.000 claims description 6
- 101100171804 Homo sapiens EFNA3 gene Proteins 0.000 claims description 6
- 101100171814 Homo sapiens EFNB1 gene Proteins 0.000 claims description 6
- 101000866914 Homo sapiens Elongation factor-like GTPase 1 Proteins 0.000 claims description 6
- 101000773151 Homo sapiens Thioredoxin-like protein 4B Proteins 0.000 claims description 3
- 102100030273 Thioredoxin-like protein 4B Human genes 0.000 claims description 3
- 101100063432 Caenorhabditis elegans dim-1 gene Proteins 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 6
- 101100335307 Xenopus laevis foxe4 gene Proteins 0.000 description 9
- 238000003745 diagnosis Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
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Abstract
The utility model relates to a capsule endoscope lens, which sequentially comprises the following components from an object plane to an image plane along an optical axis: the first lens with negative focal power has a convex object side surface and a concave image side surface; a second lens element with positive refractive power having a convex object-side surface and a concave image-side surface; the object side surface of the third lens with positive focal power is a convex surface, and the image side surface of the third lens is a convex surface. The utility model uses three lenses, and can realize the technical effects of large view field angle, small caliber and high resolution through the design of different effective focal lengths and refractive indexes of the concave-convex lenses.
Description
Technical Field
The utility model belongs to the field of optical imaging lenses, and particularly relates to a capsule endoscope lens.
Background
With the continuous updating of modern medical appliances and related equipment, the capsule endoscope has an indispensable effect on the examination of organs in human bodies and the determination of focus positions and ranges. An excellent capsule endoscope lens ensures that the size is small enough, and meanwhile, the imaging range and the imaging definition are higher, so that a doctor can analyze local details of a focus more easily, and more accurate diagnosis can be made.
Disclosure of Invention
The present utility model is directed to solving the above problems, and provides a capsule endoscope lens having a large field angle, a small caliber, and a high resolution.
The technical scheme of the utility model is as follows:
a capsule endoscope lens sequentially comprises from an object plane to an image plane along an optical axis:
the first lens is provided with negative focal power, 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 object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
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 effective focal length of the first lens and the effective focal length of the capsule endoscope lens satisfy the following formula: -1.0< EFL1/EFL < -0.5;
the effective focal length of the second lens and the effective focal length of the capsule endoscope lens satisfy the following formula: 1.8< EFL2/EFL <2.2;
the effective focal length of the third lens and the effective focal length of the capsule endoscope lens satisfy the following formula: 0.9< EFL3/EFL <1.35;
wherein: EFL1 is the effective focal length of the first lens in mm; EFL2 is the effective focal length of the second lens in mm; EFL3 is the effective focal length of the third lens in mm; EFL is the effective focal length of a capsule endoscope lens in mm.
The lens system further comprises an aperture diaphragm arranged between the second lens and the third lens.
The lens further comprises an infrared filter arranged on one side of the image side surface of the third lens.
More preferably, the method further comprises: tan (Wp/2) > 3.7; tan (W/2) > 11.4;
wherein: wp is the maximum entrance pupil angle of the capsule endoscope lens, in degrees; w is the maximum vertex angle of view of the capsule endoscope lens, in degrees; the maximum entrance pupil field angle of the capsule endoscope lens is larger than 150 degrees, the object-taking range of the capsule endoscope lens is ensured, the measured picture is enlarged, and the doctor can detect more conveniently.
Further comprises: the ratio of the I to the phi 1/phi 2 is more than 2.4;
wherein: Φ1 is the optical power of the first lens, unit diopter; Φ2 is the optical power of the second lens, the unit diopter; the larger the refractive power represents the deflection capability of the first lens to the light, namely the larger the deflection capability of the first lens to the light, the larger the ratio of the I phi 1/phi 2 is, so that the capsule endoscope lens can have enough view field angle, and the shooting range is enlarged.
Further comprises: dim1 > Dim2 > Dim3; dim1 < 1.9 mm;
wherein: dim1 is the diameter of the first lens in mm; dim2 is the diameter of the second lens in mm; dim3 is the diameter of the third lens in mm.
Further comprises: EFL/F# -0.165;
wherein: f# is the image space F number of the capsule endoscope lens, and the unit is dimensionless; the spatial depth of the object space at which a sharp image can be obtained at the image plane is called depth of field. The smaller the ratio of EFL/F# is, the wider the depth of field is, for a given object detection distance. The depth of field of the capsule endoscope lens can meet 0 mm-50 mm, objects near and far can be seen clearly, and diagnosis of illness state by doctors is facilitated.
Further comprises: EPD/EFL > 0.25;
wherein: EPD is the entrance pupil diameter of the capsule endoscope lens, in mm; the greater the ratio of EPD/EFL, the greater the illumination reliability of the capsule endoscope lens.
Wherein, the first lens, the second lens and the third lens are all plastic aspheric lenses.
The utility model has the technical effects that:
the utility model uses three lenses, can realize the technical effects of large view field angle, small caliber and high resolution simultaneously by the design of different effective focal lengths and refractive indexes of the concave-convex lenses, has a wider depth of field range of 0 mm-50 mm, is beneficial to the examination of doctors, and improves the examination efficiency.
Drawings
Fig. 1 is a schematic view of the optical path of a capsule endoscope lens.
Fig. 2 is a schematic structural view of a capsule endoscope lens.
Fig. 3 is a distortion diagram of a capsule endoscope lens.
Fig. 4 is an aberration diagram of a capsule endoscope lens.
Fig. 5 is a graph of the difference MTF (modulation transfer function) at the designed working distance of a capsule endoscope lens.
Fig. 6 is a view of a Diffraction MTF of 0mm object distance for a capsule endoscope lens in focus at a designed working distance.
Fig. 7 is a view of a Diffraction MTF of 50mm object distance for a capsule endoscope lens in focus at a designed working distance.
Description of the drawings: lens1, first lens; lens2, second lens; lens3, third lens; STO and aperture stop; an IR, infrared filter; s1, an object side surface of a first lens; s2, an image side surface of the first lens; s3, the object side surface of the second lens; s4: an image side surface of the second lens; s5, the object side surface of the third lens is provided; s6, an image side surface of the third lens; image, image plane.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the embodiments described herein are merely illustrative of the present utility model and are not intended to be limiting.
Example 1
A capsule endoscope lens sequentially comprises, from an object plane to an image plane along an optical axis:
a first lens element 1 with negative focal power, wherein an object side surface S1 of the first lens element is a convex surface, and an image side surface S2 of the first lens element is a concave surface;
a second lens element S2 with positive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave;
a third lens element lens with positive focal power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex;
the effective focal length of the first lens1 and the effective focal length of the capsule endoscope lens satisfy the following formula: -1.0< EFL1/EFL < -0.5;
the effective focal length of the second lens2 and the effective focal length of the capsule endoscope lens satisfy the following formula: 1.8< EFL2/EFL <2.2;
the effective focal length of the third lens3 and the effective focal length of the capsule endoscope lens satisfy the following formula: 0.9< EFL3/EFL <1.35;
wherein: EFL1 is the effective focal length of the first lens1 in mm; EFL2 is the effective focal length of the second lens2 in mm; EFL3 is the effective focal length of the third lens3 in mm; EFL is the effective focal length of a capsule endoscope lens in mm.
Example 2
On the basis of the embodiment 1, the method further comprises the following steps:
wherein, also include the aperture stop STO that is set up between second lens2 and third lens 3;
and an infrared filter IR arranged on the image side surface S6 side of the third lens.
Example 3
On the basis of example 2,
further comprises: tan (Wp/2) > 3.7; tan (W/2) > 11.4;
wherein: wp is the maximum entrance pupil angle of the capsule endoscope lens, in degrees; w is the maximum vertex angle of view of the capsule endoscope lens, in degrees; the maximum entrance pupil field angle of the capsule endoscope lens is larger than 150 degrees, the object-taking range of the capsule endoscope lens is ensured, the measured picture is enlarged, and the doctor can detect more conveniently.
Further comprises: the ratio of the I to the phi 1/phi 2 is more than 2.4;
wherein: Φ1 is the optical power of the first lens1, unit diopter; Φ2 is the optical power of the second lens2, unit diopter; the larger the refractive power represents the deflection capability of the first lens1 to the light, namely the larger the deflection capability of the first lens1 to the light, the larger the ratio of the I phi 1 to the I phi 2 is, so that the capsule endoscope lens can have enough view field angle, and the shooting range is enlarged.
Further comprises: dim1 > Dim2 > Dim3; dim1 < 1.9 mm;
wherein: dim1 is the diameter of the first lens1 in mm; dim2 is the diameter of the second lens2 in mm; dim3 is the diameter of the third lens3 in mm.
Further comprises: EFL/F# -0.165;
wherein: f# is the image space F number of the capsule endoscope lens, and the unit is dimensionless; the spatial depth of the object space at which a sharp image can be obtained at the image plane is called depth of field. The smaller the ratio of EFL/F# is, the wider the depth of field is, for a given object detection distance. The depth of field of the capsule endoscope lens can meet 0 mm-50 mm, objects near and far can be seen clearly, and diagnosis of illness state by doctors is facilitated.
Further comprises: EPD/EFL > 0.25;
wherein: EPD is the entrance pupil diameter of the capsule endoscope lens, in mm; the greater the ratio of EPD/EFL, the greater the illumination reliability of the capsule endoscope lens.
The first lens element 1, the second lens element 2 and the third lens element 3 are all plastic aspheric lenses.
The following is a table of lens data for the examples.
Table 1 lens parameter table for capsule endoscope lens
Table 2 ratio range of aspherical sagittal height sag of first lens1 to radius r of capsule endoscope lens
TABLE 3 ratio Range of aspherical sagittal height sag of second lens2 of Capsule endoscope lens to radius r
Table 4 ratio range of aspherical sagittal height sag of third lens3 of capsule endoscope lens to radius r
Wherein, sag is aspheric sagittal height, unit mm; r is the radius in mm.
Compared with the prior art, the utility model has the following advantages:
(1) The apertures of the first lens1, the second lens2 and the third lens3 are small, so that the technical effect of small aperture is realized;
(2) The angle of the view field is larger;
(3) The effective focal length is smaller, the depth of field is good, and the object distance can be 0 mm-50 mm;
(4) Three plastic aspherical lenses are used, aberration is well corrected through the structure of positive and negative lens combination, and the technical effect of high resolution is achieved.
Claims (9)
1. A capsule endoscope lens, characterized in that: the optical axis comprises, in order from an object plane to an image plane (image):
a first lens (lens 1) having negative optical power, wherein an object side surface (S1) of the first lens is a convex surface, and an image side surface (S2) of the first lens is a concave surface;
a second lens (lens 2) having positive optical power, the object-side surface (S3) of the second lens being convex, and the image-side surface (S4) of the second lens being concave;
a third lens (lens 3) having positive optical power, wherein an object side surface (S5) of the third lens is a convex surface, and an image side surface (S6) of the third lens is a convex surface;
the effective focal length of the first lens (lens 1) and the effective focal length of the capsule endoscope lens satisfy the following formula: -1.0< EFL1/EFL < -0.5;
the effective focal length of the second lens (lens 2) and the effective focal length of the capsule endoscope lens satisfy the following formula: 1.8< EFL2/EFL <2.2;
the effective focal length of the third lens (lens 3) and the effective focal length of the capsule endoscope lens satisfy the following formula: 0.9< EFL3/EFL <1.35;
wherein: EFL1 is the effective focal length of the first lens (lens 1), in mm; EFL2 is the effective focal length of the second lens (lens 2), in mm; EFL3 is the effective focal length of the third lens (lens 3), in mm; EFL is the effective focal length of a capsule endoscope lens in mm.
2. The capsule endoscopic lens of claim 1, wherein: also included is an aperture Stop (STO) disposed between the second lens (lens 2) and the third lens (lens 3).
3. The capsule endoscopic lens of claim 2, wherein: the lens further comprises an infrared filter (IR) arranged on the image side surface (S6) side of the third lens.
4. A capsule endoscopic lens as defined in claim 3, wherein: further comprises:
tan(Wp/2)＞3.7；tan(W/2)＞11.4；
wherein: wp is the maximum entrance pupil angle of the capsule endoscope lens, in degrees; w is the maximum vertex field angle of the capsule endoscope lens, in degrees.
5. The capsule endoscopic lens of claim 4, wherein: further comprises: the ratio of the I to the phi 1/phi 2 is more than 2.4;
wherein: Φ1 is the optical power of the first lens (lens 1), unit diopter; Φ2 is the optical power of the second lens (lens 2), unit diopter.
6. The capsule endoscopic lens of claim 5, wherein: further comprises:
Dim1＞Dim2＞Dim3；Dim1＜1.9 mm；
wherein: dim1 is the diameter of the first lens (lens 1), in mm; dim2 is the diameter of the second lens (lens 2), in mm; dim3 is the diameter of the third lens (lens 3), in mm.
7. The capsule endoscopic lens of claim 6, wherein: further comprises: EFL/F# -0.165;
wherein: f# is the image side F number of the capsule endoscope lens, and the unit is dimensionless.
8. The capsule endoscopic lens of claim 7, wherein: further comprises: EPD/EFL > 0.25;
wherein: EPD is the entrance pupil diameter of a capsule endoscope lens in mm.
9. The capsule endoscopic lens of claim 8, wherein: the first lens (lens 1), the second lens (lens 2) and the third lens (lens 3) are all plastic aspheric lenses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323252859.5U CN220289939U (en) | 2023-11-30 | 2023-11-30 | Capsule endoscope lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323252859.5U CN220289939U (en) | 2023-11-30 | 2023-11-30 | Capsule endoscope lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220289939U true CN220289939U (en) | 2024-01-02 |
Family
ID=89342276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323252859.5U Active CN220289939U (en) | 2023-11-30 | 2023-11-30 | Capsule endoscope lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220289939U (en) |
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2023
- 2023-11-30 CN CN202323252859.5U patent/CN220289939U/en active Active
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