CN216526523U - Multipurpose hard endoscope with large visual field and large field depth - Google Patents

Abstract

The utility model discloses a multipurpose hard endoscope with a large visual field and a large depth of field, which comprises a long cylindrical frame body, wherein the end part of the frame body is connected with a camera connector chuck, the end of the frame body, which is close to the camera connector chuck, is provided with a handle, the frame body comprises a rigid shell and a core cable, the rigid shell is arranged at the outer side of the core cable, and an ocular lens system, a first image transmission system, a second image transmission system, a third image transmission system and an objective lens system which are sequentially arranged are arranged in the core cable along the axial direction of the core cable. The beneficial effects of the utility model are: the field range can be increased, the depth of field of imaging can be increased, equal-proportion image transmission can be realized, the effects of reducing chromatic aberration and improving resolution can be achieved, the imaging quality can be improved, the comfort level of eyes of a doctor can be improved, and the field of vision can not be lost; the visual inspection device can adapt to complex environments, maintenance environments and human body intracavity environments in industrial production, can be used for visual inspection of narrow areas by personnel or can be used for observing by matching with a medical high-definition camera or an industrial camera according to use scenes.

Description

Multipurpose hard endoscope with large visual field and large field depth

Technical Field

The utility model relates to the technical field of endoscopes, in particular to a multipurpose hard endoscope with a large visual field and a large depth of field.

Background

With the development of science and technology, the types of medical endoscopes are more and more, and the main functions are different. General medical endoscopes can be classified into a hard endoscope, a flexible endoscope, and an electronic endoscope. The rigid endoscope has the advantages of fixed structure, no bending, good imaging performance and high resolution, and is used in common minimally invasive surgery. The objective lens of a flexible endoscope, which is a fixed optical system and can be locally bent during image transmission, is generally used for examining intestinal diseases. The electronic endoscope is a novel endoscope, and the capsule endoscope is most representative and is currently used for detecting pathological changes of the stomach. In general, flexible endoscopes and electronic endoscopes are generally used to examine the condition of a patient, while rigid endoscopes are used to provide a good field of view for minimally invasive surgery. In recent years, minimally invasive surgery has become accepted by a wide range of doctors and patients, so that a rigid endoscope is also becoming more and more important medically. Meanwhile, the China has a rapid industrial development and is advancing towards the intelligent industry, and the hard endoscope has wider and wider application in the field of industrial machine vision.

Since the first endoscope was invented in 1806, the hard endoscope relay system evolved from the first simple single-bundle thin lens configuration to the dual-bundle thin lens configuration and then to the Hopkins rod lens configuration. In medicine, endoscopes with higher resolution and greater depth of field are required to reduce the risk of surgery and to improve the fineness of the target view. Therefore, high definition imaging is a trend in the development of endoscopes. However, endoscopic imaging differs from direct observation by the human eye, and the degree of clarity of endoscopic imaging depends not only on its resolution, but also is limited by the imaging quality of the system. Since the aperture of the optical system is small, the high resolution of the endoscope is required simply to increase the diameter of the entrance pupil, which tends to increase aberrations and form stray light, resulting in a reduction in imaging quality. Therefore, in order to ensure the accurate observation and safe operation of the endoscope, the designer has to sacrifice the partial resolution to ensure the excellent image quality of the optical system, and the improvement of the imaging definition of the system is limited. The resolution of the current endoscope with the outer diameter of 4mm is generally 13-16 lp/mm. Therefore, how to improve the imaging quality of the hard endoscope, improve the resolution ratio of the hard endoscope, increase the field range and increase the depth of field of imaging is a very important problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a multipurpose hard endoscope with a large visual field and a large depth of field, which solves the problems in the prior art.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a hard formula endoscope of big field of vision big depth of field multipurpose, includes long cylindric frame body, the end connection of frame body has camera connector dop, the camera connector dop end that is close to of frame body is equipped with the handle, the frame body includes rigid shell and core cable, the rigid shell sets up in the outside of core cable, be equipped with eyepiece system, first image transmission system, second image transmission system, third image transmission system and the objective system that arranges in proper order along its axial direction in the core cable, eyepiece system sets up in the camera connector dop end that is close to of frame body.

Further preferably, an insulating protective sleeve is arranged between the rigid shell and the core cable, and a semiconductor shielding layer and an insulating layer are sequentially arranged on the insulating protective sleeve from outside to inside.

Preferably, an illuminating lens is arranged at the end, far away from the chuck of the camera connector, of the insulating protective sleeve, and the illuminating lens is annular and sleeved on the core cable.

Preferably, the handle is provided with a lighting switch, the lighting lens is connected with a lighting fiber bundle arranged between the semiconductor shielding layer and the insulating layer of the insulating protective sleeve, and the lighting lens is connected with the lighting switch on the handle through the lighting fiber bundle.

Further preferably, the eyepiece system comprises a plano-convex lens and a double cemented lens, the plano-convex lens is arranged on the side of the double cemented lens far away from the first image transmission system, and the plane side of the plano-convex lens is arranged on the side of the plano-convex lens far away from the double cemented lens.

Preferably, the objective system comprises a double cemented lens, a positive lens and a negative lens which are arranged in sequence, and the double cemented lens is arranged at the end of the objective system close to the third image transmission system.

Further preferably, the first image transmission system, the second image transmission system and the third image transmission system all comprise two double-cemented lenses and two Hopkins rod lenses, and the two double-cemented lenses are arranged between the two Hopkins rod lenses.

Further preferably, the two ends of the Hopkins rod lens close to the objective lens system end of the third image transmission system are both provided with negative lenses, and rigid spacing tubes are arranged between two adjacent lenses in the plano-convex lens, the double-cemented lens, the positive lens, the negative lens and the Hopkins rod lens.

Has the advantages that: the multipurpose hard endoscope with the large visual field and the large depth of field is provided with an ocular lens system, a first image transmission system, a second image transmission system, a third image transmission system and an objective lens system, and a longer rear working distance is obtained through the objective lens system, so that the visual field range is enlarged; the image transmission system combined by the first image transmission system, the second image transmission system and the third image transmission system realizes equal-proportion image transmission, plays roles of reducing chromatic aberration and improving resolution ratio, improves imaging quality, and can obtain positive images by odd groups of image transmission systems, thereby facilitating visual observation of human eyes; the objective lens system, the three image transmission systems and the ocular lens system are arranged into a multiple structure and comprise multiple object distances, and the imaging quality is considered when the object distances are different, so that the system can clearly image in a larger object distance range, and the large depth of field is realized; the exit pupil distance is increased through the ocular lens system, the comfort of the eyes of a doctor is improved, and the visual field cannot be lost; the device can adapt to complex environments of industrial production, maintenance environments and human body intracavity environments, can be used for detecting the appearance of a narrow area, and can be observed by visual observation of personnel or observed by matching a medical high-definition camera or an industrial camera according to a use scene; the method is beneficial for doctors to obtain the details of tissue characteristics and focus areas, so that diseases can be found and diagnosed in time; the device is favorable for detecting the depth of narrow and small hole-shaped products, miniature pipelines, miniature cylinders and other products, simultaneously, the good achromatization capability can better eliminate color noise points on a detected image caused by metal products, and the high resolution and the achromatization capability can ensure that the anti-noise capability is stronger when a high-definition video camera or an industrial camera is used for imaging.

Drawings

FIG. 1 is a schematic diagram of a frame structure of a multipurpose hard endoscope with a large field of view and a large depth of field according to the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1 according to the present disclosure;

FIG. 3 is a schematic view of the fitting structure of the eyepiece system, the first image transmission system, the second image transmission system, the third image transmission system and the objective system disclosed in the present invention;

FIG. 4 is a schematic view of the eyepiece system disclosed herein;

FIG. 5 is a schematic view of an objective lens system according to the present disclosure;

FIG. 6 is a schematic structural diagram of a first image transmission system, a second image transmission system and a third image transmission system according to the present disclosure;

fig. 7 is a schematic view of a fitting structure of a camera connector chuck and an eyepiece system disclosed in the present invention.

Reference numerals: 1-frame body, 101-rigid shell, 102-core cable, 103-insulating protective sleeve, 2-camera connector chuck, 3-handle, 4-ocular lens system, 5-first image transmission system, 6-second image transmission system, 7-third image transmission system, 8-objective lens system, 9-lighting lens, 10-plano-convex lens, 11-double cemented lens, 12-positive lens, 13-negative lens and 14-Hopkins rod lens.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1-7, a multipurpose hard endoscope with a large visual field and a large depth of field comprises a long cylindrical frame body 1, a camera connector chuck 2 and a handle 3 are arranged, the camera connector chuck 2 is in threaded connection with the frame body 1 and is used for fixing an eyepiece system 4, and the endoscope can be conveniently connected with an endoscope connector of a medical high-definition video camera or an industrial camera, so that the endoscope can be used for visual observation of human eyes and can also be imaged by a photoelectric display device; the handle 3 is sleeved on the frame body 1, and a lighting switch is arranged on the handle 3 and is used for switching control of a lighting lens 9 at the end, far away from the camera connector chuck 2, of the insulating protective sleeve 103; the frame body 1 comprises a rigid shell 101 and a core cable 102, the rigid shell 101 is arranged on the outer side of the core cable 102, an insulating protective sleeve 103 is arranged between the rigid shell 101 and the core cable 102, a semiconductor shielding layer and an insulating layer are sequentially arranged on the insulating protective sleeve 103 from outside to inside, the semiconductor shielding layer plays a role in sensing electric shielding, the insulating layer plays a role in insulating and strengthening the core cable 102, and prevents the eyepiece system 4, the first image transmission system 5, the second image transmission system 6, the third image transmission system 7 and the metal induction lens of the objective system 8 from interfering with the imaging effect of the endoscope; the rigid outer shell 101 provides the core cable 102 with pressure resistance. The core cable 102 is used for mounting the ocular lens system 4, the first image transmission system 5, the second image transmission system 6, the third image transmission system 7 and the objective lens system 8.

The eyepiece system 4 consists of a plano-convex lens 10 and a double cemented lens 11, the plano-convex lens 10 is arranged on the side surface, far away from the first image transmission system 5, of the double cemented lens 11, emergent rays are parallel light and then are converged on the plane of the plano-convex lens 10 through refraction of the convex surface of the plano-convex lens 10, so that human eyes can observe at an exit pupil, and therefore, an enough exit pupil distance is needed, the comfort of eyes of a doctor is improved, and the visual field cannot be lost; the plane side of the plano-convex lens 10 is disposed on its side away from the doublet 11, and serves as a protective glass.

The objective system 8 comprises a double cemented lens 11, a positive lens 12 and a negative lens 13 which are arranged in sequence, wherein the double cemented lens 11 is arranged at the end of the objective system 8 close to the third image transmission system 7; the objective system 8 adopts a reverse distance structure, namely the focal power of one end of the objective system 8 is negative, and a single negative lens 13 is adopted to obtain a longer rear working distance, so that light beams are diverged, and the purpose of large field of view is realized; the focal power of the other end of the objective system 8 is positive, and the objective system is composed of a positive lens 12 and a double-cemented lens 11, so that a larger relative aperture is realized, and a longer back intercept is realized; set up objective system 8 to image space telecentric optical path in this application, select 1, the chief ray of 0.707 and 0.5 visual field as characteristic light, regard the incident angle of chief ray at the image plane as the constraint condition, the depth of parallelism of control light and optical axis, avoided off-axis light to be absorbed by rigidity spacer tube or Hopkins rod mirror 14 edge, or take place the total reflection and can not normally propagate in relay system at Hopkins rod mirror 14 inner wall, arouse image quality deterioration and great vignetting.

The first image transmission system 5, the second image transmission system 6 and the third image transmission system 7 respectively comprise two double cemented lenses 11 and two Hopkins rod lenses 14, the two double cemented lenses 11 are arranged between the two Hopkins rod lenses 14, and the two double cemented lenses 11 and the two Hopkins rod lenses 14 are symmetrically arranged, so that the magnification of the image transmission system is-1, and the equal-proportion image transmission is realized; vertical axis aberrations such as vertical axis chromatic aberration, coma aberration, distortion and the like of the left part and the right part of the image transmission system are equal in size and opposite in sign, and can be automatically reduced, so that the effects of reducing chromatic aberration and improving resolution are achieved, and the imaging quality is improved; meanwhile, the negative lenses 13 are arranged at the two ends of the Hopkins rod lens 14, close to the end of the objective lens system 8, of the third image transmission system 7, so that the connection combination of the objective lens system 8 and the third image transmission system 7 is optimized.

When the system is integrally and cooperatively designed in an optimized mode, in order to realize large depth of field under the condition that two key parameters, namely the entrance pupil diameter and the working distance, are strictly restricted, starting from the object distance, an endoscope optical system (an objective lens system, three image transmission systems and an eyepiece lens system) is set to be of a multiple structure and comprises multiple object distances, the imaging quality is considered when different object distances are considered, the system can clearly image in a large object distance range, and the large depth of field is realized.

In the application, the lighting lens 9 is connected with a lighting fiber bundle arranged between the semiconductor shielding layer and the insulating layer of the insulating protective sleeve 103, the lighting lens 9 is connected with a lighting switch on the handle 3 through the lighting fiber bundle, and the on-off control of the lighting lens 9 through the handle 3 is realized; the illuminating lens 9 is annular and sleeved on the core cable 102, and is located at the periphery of the objective lens system 8, and is used for illuminating the environment at the position of the objective lens system 8 and improving the imaging effect of the objective lens system 8.

In this application, all be equipped with rigidity spacer tube between two adjacent lenses in plano-convex lens 10, two cemented lens 11, positive lens 12, negative lens 13 and the Hopkins rod mirror 14 and realize fixed to the distance control between each lens and the installation of each lens.

In this application, this endoscope can adapt to industrial production complex environment, maintenance environment, human intracavity environment, detects narrow and small regional outward appearance, can observe by personnel's visual, perhaps observes according to the medical high definition camera of use scene collocation or industrial camera. By adopting the endoscope imaging mode, in the field of minimally invasive surgery, the endoscope has larger visual field and depth of field in design compared with other endoscopes, and simultaneously has high-definition imaging, so that doctors can acquire details of tissue characteristics and focus areas conveniently, and diseases can be discovered and diagnosed in time; in the field of industrial appearance detection and mechanical maintenance, the detection depth of narrow and small hole-shaped products, miniature pipelines, miniature cylinders and other products is facilitated except for larger visual field and depth of field, meanwhile, the good achromatization capability is better for eliminating color noise points on a detected image brought by metal products, and the high resolution and the achromatization capability enable a high-definition video camera or an industrial camera to have stronger anti-noise capability during imaging.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the contents of the present invention within the scope of the protection of the present invention.

Claims (8)

1. The utility model provides a hard formula endoscope of big field of vision big depth of field multipurpose, includes long cylindric frame body (1), the end connection of frame body (1) has camera connector dop (2), the camera connector dop (2) end that is close to of frame body (1) is equipped with handle (3), its characterized in that: the frame body (1) comprises a rigid shell (101) and a core cable (102), the rigid shell (101) is arranged on the outer side of the core cable (102), an ocular lens system (4), a first image transmission system (5), a second image transmission system (6), a third image transmission system (7) and an objective lens system (8) are sequentially arranged in the core cable (102) along the axial direction of the core cable, and the ocular lens system (4) is arranged at the end, close to the camera connector chuck (2), of the frame body (1).

2. The large field of view and depth of field multipurpose hard endoscope of claim 1, wherein: an insulating protective sleeve (103) is arranged between the rigid shell (101) and the core cable (102), and a semiconductor shielding layer and an insulating layer are sequentially arranged on the insulating protective sleeve (103) from outside to inside.

3. The multipurpose hard endoscope of claim 2, characterized by the following features: the end, far away from the camera connector chuck (2), of the insulating protective sleeve (103) is provided with an illuminating lens (9), and the illuminating lens (9) is annular and is sleeved on the core cable (102).

4. The large field of view and depth of field multipurpose hard endoscope of claim 3, wherein: the handle (3) is provided with a lighting switch, the lighting lens (9) is connected with a lighting optical fiber bundle arranged between the semiconductor shielding layer and the insulating layer of the insulating protective sleeve (103), and the lighting lens (9) is connected with the lighting switch on the handle (3) through the lighting optical fiber bundle.

5. The large field of view and depth of field multipurpose hard endoscope of claim 1, wherein: eyepiece system (4) comprises plano-convex lens (10) and two cemented lens (11), plano-convex lens (10) set up in the side of keeping away from first image transmission system (5) of two cemented lens (11), the plane side of plano-convex lens (10) sets up in its side of keeping away from two cemented lens (11).

6. The multipurpose hard endoscope of claim 5, wherein: the objective system (8) comprises a double cemented lens (11), a positive lens (12) and a negative lens (13) which are sequentially arranged, wherein the double cemented lens (11) is arranged at the end, close to the third image transmission system (7), of the objective system (8).

7. The multipurpose hard endoscope of claim 6, wherein: first image transmission system (5), second pass image transmission system (6) and third pass image transmission system (7) all contain two cemented lens (11) and two Hopkins rod mirror (14), two cemented lens (11) set up between two Hopkins rod mirror (14).

8. The large field of view and depth of field multipurpose hard endoscope of claim 7, wherein: the both ends of Hopkins rod lens (14) that are close to objective system (8) end of third biography image system (7) all are equipped with negative lens (13), all be equipped with rigid spacer tube between two adjacent lenses in plano-convex lens (10), two cemented lens (11), positive lens (12), negative lens (13) and Hopkins rod lens (14).

Images