CN219089216U

CN219089216U - Capsule endoscope lens

Info

Publication number: CN219089216U
Application number: CN202223380156.6U
Authority: CN
Inventors: 黄晓园; 张玉良; 王红成; 刘晓雅
Original assignee: Dongguan University of Technology
Current assignee: Dongguan University of Technology
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-05-30
Anticipated expiration: 2032-12-16

Abstract

The utility model discloses a capsule endoscope lens, which comprises a first lens group, a second lens group and an optical filter from left to right, wherein a diaphragm is arranged between the first lens group and the second lens group, the first lens group has a negative focal length, the second lens group has a positive focal length, and the total lens group consists of 5 glass mirrors. Through rationally setting up the optical refractive index and the focal length of each lens, can realize the formation of image of big visual field and high definition effect simultaneously, do benefit to the inside inspection of health very much and use, can accelerate doctor's inspection speed and efficiency, reduce the discomfort in the patient inspection process.

Description

Capsule endoscope lens

Technical Field

The utility model relates to the technical field of capsule endoscopes, in particular to a capsule endoscope lens.

Background

An endoscope is a tube equipped with a light that can be passed orally into the stomach or through other natural orifices. The lesions that cannot be seen by X-rays can be seen with an endoscope, so that it is very useful for doctors. For example, an endoscope may be used to view ulcers or tumors in the stomach, thereby creating an optimal treatment regimen. The lens is an important component of the endoscope, and the imaging angle and definition thereof are important indexes for considering the quality and effect of the lens.

Chinese patent CN207529018U "a microcapsule endoscope" discloses a capsule endoscope, which comprises five mirrors altogether, and realizes the effect of a large-angle lens by combining convex mirrors and concave mirrors. The utility model discloses an endoscope lens with a large view field and high resolution, which is obtained by means of concave-convex lens shape and combination.

Disclosure of Invention

The utility model aims to solve the technical problem that the existing capsule endoscope lens is difficult to simultaneously have a large view field and high resolution, and provides a capsule endoscope lens structure which can accelerate the effect in the actual use process and reduce discomfort of patients.

To achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a capsule endoscope lens, which comprises a first lens group, a second lens group and an optical filter from left to right, wherein a diaphragm is arranged between the first lens group and the second lens group;

the first lens group has a negative focal length and comprises a first lens and a second lens, wherein the first lens is a biconcave lens with negative focal power, and the second lens is a meniscus lens with positive focal power;

the second lens group has positive focal length and comprises a fourth lens, a fifth lens and a sixth lens, wherein the fourth lens is a plano-convex lens with positive focal power, the fifth lens is a biconvex lens with negative focal power, the sixth lens is a meniscus lens with positive focal power and a convex surface facing an image surface, and the fifth lens and the sixth lens are bonded to form a cemented lens group.

In one embodiment, the overall focal length of the endoscope lens is f, and the combined focal lengths of the first lens group and the second lens group are fa, fb, and fa/fb is less than or equal to 10 and less than or equal to-1 respectively.

In one embodiment, the focal lengths of the first lens, the second lens, the fourth lens and the cemented lens group are f1, f2, f4, f5-6 respectively, the focal length range of the first lens is 1-f 1/f-2, the focal length range of the second lens is 4-f 2/f-7, the focal length range of the fourth lens is 1-f 3-2.5, and the focal length range of the cemented lens is 2-f 5-6/f-5.

In one embodiment, the total optical length TTL of the endoscope lens is less than or equal to 6mm.

In one embodiment, the refractive index of light and the Abbe constant of the first lens are equal to or greater than 1.4 and equal to or less than 1.6,75 and equal to or less than Vd and equal to or less than 95;

the light refractive index and the light Abbe constant of the second lens are equal to or more than 1.8 and equal to or less than 2.0,30 and equal to or less than 50;

the light refractive index and the light Abbe constant of the fourth lens are not less than 1.6 and not more than 1.8,40 and not more than 60;

the optical refractive index and the optical Abbe constant of the fifth lens are 1.8-2.0, and Vd is 10-30;

the light refractive index and the light Abbe constant of the sixth lens are not less than 1.5 and not more than 1.7,50, and Vd is not less than 70; where Nd denotes the optical refractive index of the lens, and Vd denotes the d-ray abbe constant of the lens.

In one embodiment, the lenses of the first lens group and the second lens group are glass spherical lenses.

In one embodiment, the light flux aperture of the diaphragm is 2.83mm.

In one embodiment, the optical filter has a selected wavelength of light between 350nm and 1000nm.

In summary, the utility model can simultaneously realize the technical effects of large visual field and high definition by the combination of five glass lenses and the design of different focal lengths and refractive indexes of the concave-convex lenses, has stable structure and easy installation, is more convenient and clear to image by arranging the optical filter, can accelerate the examination of doctors, and improves the examination efficiency.

Drawings

FIG. 1 is a schematic view of a capsule endoscope lens according to an embodiment of the present utility model;

FIG. 2 is an optical system light path diagram;

FIG. 3 is a graph of relative illuminance in accordance with the present utility model;

fig. 4 is a dot column diagram of the present utility model:

FIG. 5 is a MTF chart of the present utility model

1. A lens number one; 2. a lens number two; 3. a diaphragm; 4. a fourth lens; 5. a fifth lens; 6. a lens number six; 7. optical filter

Detailed Description

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

As shown in fig. 1, there is provided a capsule endoscope lens including a first lens group, a second lens group, and an optical filter from left to right, with a diaphragm provided therebetween; the first lens group has a negative focal length and comprises a first lens and a second lens, wherein the first lens is a biconcave lens with negative focal power, and the second lens is a meniscus lens with positive focal power; the second lens group has positive focal length and comprises a fourth lens, a fifth lens and a sixth lens, wherein the fourth lens is a plano-convex lens with positive focal power, the fifth lens is a biconvex lens with negative focal power, the sixth lens is a meniscus lens with positive focal power and the convex surface facing the image surface, and the fifth lens and the sixth lens are bonded to form a cemented lens group; the lenses of the first lens group and the second lens group are glass spherical lenses; the aperture of the luminous flux of the diaphragm is 2.83mm; the wavelength of the optical filter is 350nm-1000nm. The first lens group and the second lens group are combined through the concave lens group and the convex lens group, a large view field effect is achieved, a proper diaphragm is arranged to ensure luminous flux, finally, the wave band affecting imaging is filtered through the arrangement of the optical filter, and imaging definition is improved.

As shown in FIG. 2, the overall focal length of the endoscope lens is f, and the combined focal lengths of the first lens group and the second lens group are fa, fb, and fa/fb is less than or equal to 10 and less than or equal to-1 respectively; the focal length of the first lens, the second lens, the fourth lens and the cemented lens group is f1, f2, f4 and f5-6 respectively, the focal length range of the first lens is 1-f 1/f-2, the focal length range of the second lens is 4-f 2/f-7, the focal length range of the fourth lens is 1-f 3-2.5, and the focal length range of the cemented lens is 2-f 5-6/f-5; the total optical length TTL of the endoscope lens is less than or equal to 6mm; the light refractive index and the light Abbe constant of the first lens are not less than 1.4 and not more than 1.6,75, and Vd is not less than 95; the light refractive index and the light Abbe constant of the second lens are equal to or more than 1.8 and equal to or less than 2.0,30 and equal to or less than 50; the light refractive index and the light Abbe constant of the fourth lens are not less than 1.6 and not more than 1.8,40 and not more than 60; the optical refractive index and the optical Abbe constant of the fifth lens are 1.8-2.0, and Vd is 10-30; the light refractive index and the light Abbe constant of the sixth lens are not less than 1.5 and not more than 1.7,50, and Vd is not less than 70; where Nd denotes the optical refractive index of the lens, and Vd denotes the d-ray abbe constant of the lens. In order to better embody the design effect, specific parameters are set as follows:

face number	Radius of curvature r	Center thickness d	Refractive index Nd	Abbe constant Vd
					OBJ	Infinity	10
1	-21.6	0.35	1.46	90
					2	0.733	0.45
3	2.06	0.84	1.95	32
					4	2.39	0.13
STO	Infinity	0.06
					6	Infinity	0.67	1.73	54
7	-1.36	0.14
					8	188.14	0.56	1.82	47
9	-1.3	0.42	1.95	18
					10	-2.662	1.19
11	Infinity	0.3	1.52	64
					12	Infinity

The imaging test is carried out by using the model lens, the axial length of the whole system is 5.99223mm, and F, d and c wavelengths are selected for design. For better analysis of aberrations, the design uses three sampling points, namely a zero-degree field of view, a 53-degree field of view and a 75-degree field of view. Fig. 2 shows a light imaging diagram.

As shown in fig. 3, the optical performance graph of the above embodiment is shown in that the brightness at the image plane is higher than 90%, and uniformity of the imaging result is achieved.

Fig. 4 shows a point diagram of an optical system of the lens of the embodiment of fig. 2 in different fields of view, and fig. 4 shows that the spot size is within the airy spot in different fields of view, and the lens is clear in imaging and good in image quality as known from rayleigh criteria.

As shown in fig. 5, which shows the MTF curve of the lens of the above embodiment, it can be obtained that the MTF is greater than 0.4 at 200lp/mm, which indicates that the imaging quality of the optical system is high.

The test data of the embodiment show that the technique of the utility model can realize the technical effects of large visual field and high definition, and the imaging light is uniform, thereby being very beneficial to doctors to clearly observe the specific condition of the diseased part of the patient under the condition of the complex digestive tract of the patient and providing useful information for the next treatment scheme.

While the utility model has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the utility model. The utility model is not to be limited by the specific embodiments disclosed herein, and other embodiments are within the scope of the utility model as defined by the claims of the present application.

Claims

1. The capsule endoscope lens is characterized by comprising a first lens group, a second lens group and an optical filter from left to right, wherein a diaphragm is arranged between the first lens group and the second lens group;

2. A capsule endoscopic lens as defined in claim 1, wherein: the overall focal length of the endoscope lens is f, and the combined focal lengths of the first lens group and the second lens group are fa and fb which are respectively less than or equal to-10 and less than or equal to fa/fb and less than or equal to-1.

3. A capsule endoscopic lens as defined in claim 2, wherein: the focal length of the first lens, the second lens, the fourth lens and the cemented lens group is f1, f2, f4 and f5-6 respectively, the focal length range of the first lens is 1-f 1/f-2, the focal length range of the second lens is 4-f 2/f-7, the focal length range of the fourth lens is 1-f 3-2.5, and the focal length range of the cemented lens is 2-f 5-6/f-5.

4. A capsule endoscopic lens as defined in claim 1, wherein: the total optical length TTL of the endoscope lens is less than or equal to 6mm.

5. A capsule endoscope lens as claimed in claim 3, wherein: the light refractive index and the light Abbe constant of the first lens are not less than 1.4 and not more than 1.6,75, and Vd is not less than 95;

6. A capsule endoscopic lens as defined in claim 1, wherein: the lenses of the first lens group and the second lens group are glass spherical lenses.

7. A capsule endoscopic lens as defined in claim 1, wherein: the luminous flux aperture of the diaphragm is 2.83mm.

8. A capsule endoscopic lens as defined in claim 1, wherein: the wavelength of the optical filter is 350nm-1000nm.