CN201320156Y - Endoscope - Google Patents

Abstract

An endoscope, comprising a light guide optical fiber for transmitting illumination light, an imaging lens located at the end of the endoscope, and an image transmission optical fiber located at one side of the imaging lens to transmit the image of an object formed by the imaging lens , the endoscope also includes a reflector, the reflector is located on the other side of the imaging lens, the reflector is provided facing the imaging lens so as to reflect light from the surrounding tube walls to the imaging lens Reflective surface. The reflective surface of the above-mentioned endoscope can reflect light from the surrounding tube walls to the imaging lens, which facilitates imaging of the tube walls around the endoscope and expands the field of view of the endoscope.

Description

endoscope

【Technical field】

The utility model relates to a medical instrument, in particular to an endoscope.

【Background technique】

Endoscopes generally refer to medical instruments that enter the human body through various channels to observe the internal conditions of the human body.

Endoscopy can achieve the purpose of observing the internal organs of the human body with the least damage. The method is to use a slender optical lens to extend into the human body, mostly through the original pores of the human body (such as gastroscope, cystoscope), and some are through artificially formed pipelines (such as laparoscope, thoracoscope, arthroscope).

Endoscope mainly includes lighting system and image transmission system. The lighting system is used to guide light into the body to illuminate the part to be seen. In the early days, a small light bulb was placed at the front end of the endoscope, but in modern times, the light source is placed outside the body and introduced into the body through an optical fiber system. The image transmission system can be divided into rigid type and soft type. The rigid type endoscope uses a series of lenses to transmit the image to the eyepiece, while the soft type endoscope uses optical fiber to transmit the image, or the photocoupler device (CCD) is placed at the front end of the endoscope. , and then transmit the digitized image information.

Traditional endoscopes can only see the image directly in front of the lens, while the surrounding area of the lens cannot be illuminated by the lighting system, and the image transmission system cannot collect the image around the lens, resulting in a small field of view and a limited angle.

【Content of utility model】

In view of this, it is necessary to provide an endoscope with an enlarged field of view to solve the problem of the small field of view of the traditional endoscope lens.

In order to solve the above technical problems, the following technical solutions are proposed:

An endoscope, comprising a light guide optical fiber for transmitting illumination light, an imaging lens located at the end of the endoscope, and an image transmission optical fiber located at one side of the imaging lens to transmit the image of an object formed by the imaging lens , the endoscope also includes a reflector, the reflector is located on the other side of the imaging lens, the reflector is provided facing the imaging lens so as to reflect light from the surrounding tube walls to the imaging lens Reflective surface.

Preferably, the reflective surface is in the shape of a side surface of a truncated cone.

Preferably, the reflector is in the shape of a truncated cone, and the reflective surface is located on a side of the truncated reflector.

Preferably, both the upper bottom surface and the lower bottom surface of the truncated conical reflector are light-transmitting parts.

Preferably, the reflector is conical, the reflective surface is located on the side of the conical reflector, and the top and bottom of the conical reflector are light-transmitting parts.

Preferably, the reflection mirror is in the shape of a ring, the reflection surface is located on the surface facing the imaging lens, and the middle part of the reflection mirror is a light-transmitting part.

Preferably, a light-transmitting portion is provided on the surface of the reflecting mirror facing the imaging lens and the surface facing away from the imaging lens.

Preferably, the imaging lens is a gradient index lens.

Preferably, the endoscope further includes a protective cover made of transparent material, and the protective cover covers the periphery of the reflecting mirror and the imaging lens.

The reflective surface of the above-mentioned endoscope can reflect light from the surrounding tube walls to the imaging lens, which facilitates imaging of the tube walls around the endoscope and expands the field of view of the endoscope.

The upper bottom surface and the lower bottom surface of the truncated conical reflector are both light-transmitting parts or the top and bottom of the conical reflector are light-transmitting parts.

The transparent protective cover will not affect the emission and reception of light, but also can protect the reflector and imaging lens from abrasion, and maintain the good optical performance of the endoscope.

【Description of drawings】

Fig. 1 is a schematic diagram of an endoscope of a preferred embodiment;

FIG. 2 is a disassembled schematic view of the reflecting mirror in FIG. 1 .

【Detailed ways】

1 and 2 are schematic diagrams of an endoscope in a preferred embodiment. The endoscope 100 includes a light guide fiber 110 , an imaging lens 120 , an image transmission fiber 130 , a mirror 140 and a protective cover 150 .

The light guiding fiber 110 is located on the periphery of the endoscope 100 . The illuminating light emitted by the light source is coupled to the front end of the light-guiding fiber 110 through the light-condensing coupling component, and the light-guiding fiber 110 transmits the illuminating light to the lens of the endoscope 100 and illuminates the observed object.

The imaging lens 120 is located at the end of the endoscope 100 , receives the illumination light reflected from the surface of the object, and refracts the reflected light to image the object on the front end of the image transmission fiber 130 . In this embodiment, the imaging lens adopts a gradient refractive index lens (Gradient Refractive Index, GRIN) lens, and utilizes the advantages of the gradient refractive index lens in light weight, small size, simple structure, high resolution, and large imaging depth of field. An endoscope with compact structure, high resolution and small chromatic aberration can be formed.

The image transmission optical fiber 130 is arranged at a position close to the imaging lens 120, and is located on one side of the imaging lens 120, and transmits the image of the object formed by the light reflected back from the object received by the imaging lens 120 to the rear end surface of the image transmission optical fiber 130 , the image is coupled to the photosensitive element, such as the target surface of CCD or CMOS, by the image coupling component. The photosensitive element converts the optical signal of the image into an electrical signal, and the electrical signal can be input into a processing device such as a computer for processing and display the image of the observed object on the display device.

The mirror 140 is located on the other side of the imaging lens 120 . The reflecting mirror 140 is in the shape of a truncated cone and includes an upper bottom surface 142 , a reflecting surface 144 and a lower bottom surface 146 .

The reflective surface 144 is the side of the truncated conical reflector 140 , and the reflective surface 144 faces the imaging lens 120 to reflect the light from the surrounding tube wall to the imaging lens 120 , so as to image the tube wall around the endoscope 100 . In this embodiment, the reflective surface 144 is a side surface of a circular truncated cone. In other embodiments, the reflector 140 may be a conical reflector, and the reflective surface 144 may be located at a side of the conical reflector.

In order to prevent the reflective surface 144 from blocking the front light from entering the imaging lens 120, the upper bottom surface 142 and the lower bottom surface 146 of the truncated conical reflector 140 are light-transmitting parts, so that the front light can penetrate the reflector 140, which is convenient for the endoscope The front end of 100 looks directly at the imaging. When the reflector 140 is a conical reflector, the top and bottom of the conical reflector are light-transmitting parts, which is convenient for direct-view imaging.

The protective cover 150 covers the periphery of the mirror 140 and the imaging lens 120, and the protective cover 150 is made of transparent material. The transparent protective cover 150 will not affect the emission and reception of light, but also can protect the mirror 140 and the imaging lens 120 from wear and tear, and maintain the good optical performance of the endoscope 100 .

In the above-mentioned embodiment, the reflecting mirror 140 is conical or conical. In other embodiments, the reflecting mirror can be circular. At this time, the reflecting surface is located on the surface of the reflecting mirror facing the imaging lens 120, and the middle part of the circular reflecting mirror is It is a light-transmitting part, which is convenient for direct viewing and imaging.

The reflective surface of the reflector 140 of the endoscope 100 can reflect the light from the surrounding tube wall to the imaging lens 120 , which is convenient for imaging the tube wall around the endoscope 100 and expands the field of view of the endoscope 100 . Light-transmitting parts are provided on the surface of the mirror 140 facing the imaging lens 120 and the surface facing away from the imaging lens 120 , so that the endoscope 100 can directly view and image.

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (9)

1, a kind of endoscope, comprise the light-conductive optic fibre that transmits illuminating ray, the imaging len that is positioned at described endoscope end, and a side that is positioned at described imaging len transmits the image transmission optical fibre of the picture of the object that described imaging len forms, it is characterized in that, described endoscope also comprises reflecting mirror, described reflecting mirror is positioned at the opposite side of described imaging len, and described reflecting mirror is provided with the reflecting surface that reflexes to described imaging len towards described imaging len with the light of tube wall around inciting somebody to action.

2, endoscope according to claim 1 is characterized in that, described reflecting surface is the shape of frustum cone side.

3, endoscope according to claim 2 is characterized in that, described reflecting mirror is truncated cone-shaped, and described reflecting surface is positioned at the side of truncated cone-shaped reflecting mirror.

4, endoscope according to claim 3 is characterized in that, the upper bottom surface and the bottom surface of described truncated cone-shaped reflecting mirror are the light transmission part.

5, endoscope according to claim 1 is characterized in that, it is conical that described reflecting mirror is, and described reflecting surface is positioned at the side of conical reflecting mirror, and the top of described conical reflecting mirror and bottom are the light transmission part.

6, endoscope according to claim 1 is characterized in that, described reflecting mirror is annular, and described reflecting surface is positioned at the face towards described imaging len, and described reflecting mirror middle part is the light transmission part.

7, endoscope according to claim 1 is characterized in that, described mirror surface is to the face of described imaging len and be equipped with the light transmission part on the face of described imaging len dorsad.

8, endoscope according to claim 1 is characterized in that, described imaging len is a gradient-index lens.

9, according to each described endoscope in the claim 1 to 8, it is characterized in that described endoscope also comprises the protective cover that transparent material is made, described protective cover covers the periphery of described reflecting mirror and imaging len.

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