CN215424506U

CN215424506U - Rigid endoscope system

Info

Publication number: CN215424506U
Application number: CN202022851089.6U
Authority: CN
Inventors: 刘小华; 公鹏飞; 王夏天
Original assignee: Wti Beijing Asia Pacific Photoelectric Instrument Co ltd
Current assignee: Wti Beijing Asia Pacific Photoelectric Instrument Co ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2022-01-07
Anticipated expiration: 2030-12-02

Abstract

The utility model provides a rigid endoscope system, which comprises an external endoscope tube, an objective lens group, a rod lens group, a main endoscope body, an image sensor, a camera system shell, a matched camera objective lens group, a light-emitting chip and a power supply interface.

Description

Rigid endoscope system

Technical Field

The utility model relates to a rigid endoscope system, and belongs to the technical field of optical instruments.

Background

Endoscopes have been used as medical optical instruments for over two hundred years, and a classic rigid endoscope composed of an optical lens in the early stage has been gradually developed into a new endoscope which integrates modern technologies, such as a fiber endoscope, an electronic endoscope, a capsule endoscope, an ultrasonic endoscope, and the like. Although the novel endoscope can overcome the technical defects of the classical rigid endoscope in some aspects and has high application value, the classical rigid endoscope still has extremely high application popularization rate and market share in the field of clinical diagnosis and treatment at present due to the unique advantages of the classical rigid endoscope in the aspects of image quality, cost performance and the like. In order to further show the unique advantages of the rigid endoscope, the development of technical research and development work on the rigid endoscope is of great significance.

At present, in order to facilitate the real-time operation and the image analysis of the doctor, the hard endoscope is usually used with the electronic camera system, so as to form a complete set of hard endoscope system, and the structure of the system is shown in fig. 1. The endoscope is a classical rigid endoscope and comprises an external endoscope tube, an internal endoscope tube, a main endoscope body, a light guide port, an illumination optical fiber bundle, an objective lens group, a rod lens group, an eyepiece group, an eye patch and the like; the electronic camera system comprises a camera objective lens group, a connecting port, an image sensor and the like. The objective group collects the illuminating light beams reflected by the biological tissues, the biological tissues are imaged for the first time, the rod lens group performs repeated imaging with unchanged object-image size on the images collected by the objective lens, the relayed images are transmitted towards the ocular group, the relay images presented by the rod lens group are amplified by the ocular group and are emitted in a parallel light mode, human eyes can observe the images in a most comfortable mode after an ocular lens, and the photographing objective group collects the parallel light beams emitted by the ocular group at the position of an image sensor.

According to the technical research result, in the optimized design scheme of the hard endoscope, a high-image quality disposable hard endoscope system is typical, the structure of the system is shown as the attached drawing 2, the core idea of the optimized design is to use a light-emitting chip to replace an illuminating optical fiber bundle, the structure of an inner and outer double endoscope tube of a classical hard endoscope is simplified, an optical element and the light-emitting chip are uniformly installed in the outer endoscope tube, and an aspheric lens manufactured by a molding process is used as the optical element of the endoscope. Therefore, the design scheme improves the imaging quality by a double physical mechanism of enlarging the caliber of the optical system and correcting aberration by adopting an aspheric imaging system, and reduces the cost by replacing an optical fiber bundle with a light-emitting chip and manufacturing a lens by adopting a mould pressing process instead of a classical grinding and polishing process.

Disclosure of Invention

In view of this, the present invention provides a rigid endoscope system, which can simplify the optical path of the endoscope and reduce the cost.

A rigid endoscope system comprises an external endoscope tube (1), an objective lens group (2), a rod lens group (4), an image sensor (9) and a matched photographic objective lens group (13);

the objective lens group (2) and the rod lens group (4) are arranged in the outer lens tube (1) in a front-back sequence; the rear end of the external lens tube (1) is provided with a matched photographing objective lens group (13), and the rear end of the matched photographing objective lens group (13) is provided with an image sensor (9);

the objective lens group (2) is used for focusing and imaging objects in the field of view of the endoscope, the rod lens group (4) is used for carrying out relay imaging on images obtained by the objective lens group (2) in a size-invariant mode and transmitting the images to the direction of the matched photographic objective lens group (13), the matched photographic objective lens group (13) is used for amplifying the relay images, the amplified conjugate images are overlapped with the position of the image sensor (9), and the image sensor (9) converts the light intensity of the conjugate images obtained by the photographic objective lens group (13) into electric signals.

Furthermore, the endoscope also comprises a light-emitting chip (14) which is arranged at the front end of the objective lens group (2) in the external lens tube (1).

Further, the endoscope also comprises a main lens body (6) which is arranged between the outer lens tube (1) and a matched photographing objective lens group (13); the main mirror body (6) is provided with a power supply interface (15) for leading a lead into the outer mirror tube (1) to supply power to the light-emitting chip (14).

Preferably, the number of the light emitting chips (14) is at least 1.

Furthermore, the device also comprises a camera system shell (10) which is internally used for installing the image sensor (9) and a matched camera objective lens group (13).

Preferably, the main mirror body (6) is connected with the camera system shell (10) in a fastening screw mode.

Preferably, the main mirror body (6) is connected with the camera system shell (10) in a fastening and buckling mode.

Preferably, the main mirror body (6) is manufactured by adopting a one-time die-casting molding process.

Preferably, the objective lens group (2), the rod lens group (4) and the matched photographic objective lens group (13) are manufactured by adopting a die pressing process.

Preferably, the material of the external endoscope tube (1) is medical stainless steel.

The utility model has the following beneficial effects:

the utility model provides a rigid endoscope system which comprises an external endoscope tube, an objective lens group, a rod lens group, a main endoscope body, an image sensor, a camera system shell, a matched photographic objective lens group, a light-emitting chip and a power supply interface, wherein the matched photographic objective lens group is arranged at the rear end of the rod lens group to realize secondary amplification of a relay image and ensure that the position of the amplified image is superposed with the position of the image sensor. By means of the collaborative design of the imaging light path of the rigid endoscope and the imaging light path of the electronic camera system, the eyepiece group, the matched eyeshade, the connecting port and other mechanical structures in the light path of the rigid endoscope are removed, and the imaging mode that the photographic objective gathers emergent light beams of the eyepiece group is adjusted to the imaging mode that the matched photographic objective group performs secondary amplification on relay images of the rod lens group. The method effectively reduces the processing and assembling cost in a simplified and optimized imaging light path mode, thereby improving the cost performance of the instrument and fully showing the specific advantages of the rigid endoscope.

Drawings

Fig. 1 is a structural diagram of a conventional rigid endoscope system.

Fig. 2 is a block diagram of a high image quality disposable hard endoscope system.

FIG. 3 is a block diagram of a rigid endoscope system according to the present invention.

Fig. 4 is a schematic optical path diagram of a conventional rigid endoscope system including an eyepiece set.

FIG. 5 is a schematic view of an optical path of a rigid endoscope system according to the present invention.

The system comprises a camera system, a light source, a light guide, a camera system shell, an external lens tube, an objective lens group, an internal lens tube, a 4-rod lens group, a lighting optical fiber bundle, a main lens body, a 7-ocular lens group, a 8-photographic objective lens group, an image sensor, a camera system shell, a connector 11, a light guide port 12, a matched photographic objective lens group 13, a light emitting chip 14, a power supply port 15 and an eye shield 16.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment.

One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.

Furthermore, the technical features and aspects described in the present invention may be combined in any suitable manner in one or more embodiments.

After analyzing the use mode of the hard endoscope at the present stage, the utility model considers that the eyepiece group in the endoscope belongs to the redundant component in the imaging optical system. Because the eyepiece group is used for amplifying the relay image transmitted by the rod lens group and imaging the relay image at an infinite position to facilitate observation of human eyes, however, a rigid endoscope is usually matched with an electronic camera system in the process of practical application, and almost no operation link exists for directly observing the image by the human eyes behind the eyepiece, so that the relay image is not required to be imaged at the infinite position; in addition, the focal length and the working distance are adjusted by optimally designing the photographic objective lens, so that the same magnification factor as that of the ocular lens can be realized when the relay image is directly subjected to secondary amplification imaging. Therefore, for the endoscope using mode at the current stage, the camera objective lens group can completely replace the function of the eyepiece lens group, the existing hard endoscope keeps redundant components of the eyepiece lens group, the eye mask and the connecting port, and the manufacturing and adjusting cost is increased invisibly.

The hard endoscope system described in the present invention, as shown in fig. 3, includes an external endoscope tube 1, an objective lens group 2, a rod lens group 4, a main lens body 6, an image sensor 9, a camera system housing 10, a matching camera objective lens group 13, a light emitting chip 14, and a power supply interface 15; the objective lens group 2 performs focusing imaging on an object observed in a field range of an endoscope, the object observed in a field range with a larger area is presented as an image with a reduced size, the rod lens group 4 performs relay imaging with unchanged magnification on the image obtained by the objective lens group 2 and transmits the image to the direction of the matched photographic objective lens group 13, the matched photographic objective lens group 13 performs amplification imaging on the relay image, the amplified image is overlapped with the position of the image sensor 9, and the image sensor 9 converts the light intensity of the image obtained by the photographic objective lens group 13 into an electrical signal to realize the acquisition of optical image information; the light-emitting chip 14 is installed at the front end of the external lens tube 1, the objective lens group 2 is installed at the rear end of the light-emitting chip 14, the rod lens group 4 is installed at the rear end of the objective lens group 2, the light-emitting chip 14, the objective lens group 2 and the rod lens group 4 are installed in the external lens tube 1 together, the rear end of the external lens tube 1 is connected with the main lens body 6, the main lens body 6 is provided with a power supply interface 15, the rear end of the main lens body 6 is connected with the camera system shell 10, the image sensor 9 and the matched camera objective lens group 13 are installed in the camera system shell 10, a wire is installed inside the power supply interface 15, the wire extends to the region of the light-emitting chip 14 from the main lens body 6 and the external lens tube 1, the wire is electrically connected with the light-emitting chip 14 and transmits electric energy to the light-emitting chip 14, and the number of the light-emitting chips 14 is determined by actual application requirements and is at least 1.

The main lens body 6 is made of one-time die casting molding material, and all lenses forming the objective lens group 2, the rod lens group 4 and the matched photographic objective lens group 13 are made by adopting a die pressing process.

Preferably, the outer lens tube 1 is made of medical stainless steel.

Preferably, the main lens body 6 is made of medical polymer plastic.

Preferably, the objective lens group 2, the rod lens group 4 and the associated photographing objective lens group 13 are made of optical glass or optical plastic.

Preferably, the outer lens tube 1 and the main lens body 6 are connected by gluing.

Preferably, the main mirror 6 is connected to the camera system housing 10 in a screw-tight manner.

Preferably, the main mirror 6 is connected to the camera system housing 10 in a snap-fit manner.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rigid endoscope system is characterized by comprising an external endoscope tube (1), an objective lens group (2), a rod lens group (4), an image sensor (9) and a matched photographic objective lens group (13); the objective lens group (2) and the rod lens group (4) are arranged in the outer lens tube (1) in a front-back sequence; the rear end of the external lens tube (1) is provided with a matched photographing objective lens group (13), and the rear end of the matched photographing objective lens group (13) is provided with an image sensor (9); the objective lens group (2) is used for focusing and imaging objects in the field of view of the endoscope, the rod lens group (4) is used for carrying out relay imaging on images obtained by the objective lens group (2) in a size-invariant mode and transmitting the images to the direction of the matched photographic objective lens group (13), the matched photographic objective lens group (13) is used for amplifying the relay images, the amplified conjugate images are overlapped with the position of the image sensor (9), and the image sensor (9) converts the light intensity of the conjugate images obtained by the photographic objective lens group (13) into electric signals.

2. A rigid endoscope system according to claim 1 and also comprising a light emitting chip (14) mounted at the front end of the objective lens group (2).

3. A rigid endoscope system according to claim 2, characterized by further comprising a main lens body (6) arranged between the external lens tube (1) and the associated photographic objective lens group (13); the main mirror body (6) is provided with a power supply interface (15) for leading a lead into the outer mirror tube (1) to supply power to the light-emitting chip (14).

4. A rigid endoscopic system according to claim 2 wherein the number of light emitting chips (14) is at least 1.

5. A rigid endoscope system according to claim 1, characterized by further comprising a camera system housing (10) inside which the image sensor (9) and the associated camera objective lens group (13) are mounted.

6. A rigid endoscope system according to claim 3, characterized in that the main scope (6) is connected with the camera system housing (10) in a screw-tight manner.

7. A rigid endoscope system according to claim 1, characterized by the fact that the main scope (6) is connected with the camera system housing (10) in a snap-tight manner.

8. A rigid endoscope system according to claim 3, characterized by that, said main scope body (6) is made by one-time die-casting process.

9. A rigid endoscopic system as defined in claim 1 wherein the objective lens group (2), the rod lens group (4) and the mating photographic objective lens group (13) are made by a molding process.

10. A rigid endoscope system according to claim 1, characterized in that the material of said external tube (1) is medical stainless steel.