CN209928135U

CN209928135U - Lens structure of very small-diameter endoscope

Info

Publication number: CN209928135U
Application number: CN201921033013.3U
Authority: CN
Inventors: 金小平
Original assignee: JIANGSU JINSHI PHOTOELECTRIC TECHNOLOGY CO LTD
Current assignee: JIANGSU JINSHI PHOTOELECTRIC TECHNOLOGY CO LTD
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2020-01-10
Anticipated expiration: 2029-07-03

Abstract

An endoscope lens structure with a very small diameter. Relate to endoscope technical field, especially relate to the improvement to extremely thin endoscope lens structure. Provides an extremely thin diameter endoscope lens structure with simple structure, convenient subsequent assembly and higher overall efficiency. The device comprises an objective lens group, an image guide bundle and an objective lens seat, wherein the objective lens group comprises a diaphragm and at least two lenses; the front end of the image guide bundle is connected with the outer end face of the last lens of the objective lens group by UV glue; the objective lens base is in a thin-wall tubular shape, and a plurality of small holes are formed in the side face position, corresponding to the inner lens and the diaphragm, of the tube wall. The utility model has the advantages of simple structure, follow-up matched stack is convenient, can improve the cooperation precision of pipe wall and lens, makes between the two realize the minimizing in the clearance, and then can increase the lens diameter or reduce the pipe wall thickness.

Description

Lens structure of very small-diameter endoscope

Technical Field

The utility model relates to an endoscope technical field especially relates to the improvement to extremely thin endoscope camera lens structure.

Background

In the existing very small diameter endoscope (whole outer diameter 0.5-1.5 mm) product, the assembly process of its lens group is roughly as follows: firstly, multiple lenses are sequentially bonded on the end face of an optical fiber; the technical means has poor reliability, and even lens falling-off can occur in some acidic occasions. And secondly, the multiple lenses are positioned in sequence, and an outer cylindrical surface sputtering process is adopted, so that the process is extremely high in cost and the quality is difficult to control. The most common method is to use thin-wall tube to assemble, i.e. glue is applied to the inner wall of the tube, and then the lenses are assembled into the tube one by one and solidified.

The technical means has reasonable cost performance, but the two processes of gluing the inner wall of the tube and installing the lens are relatively complex to operate, and in addition, the inner wall of the tube is bound to occupy certain annular size after gluing, so that the overall efficiency of the lens group is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a to above problem, provide a simple structure, follow-up matched stack convenience, the higher extremely thin footpath endoscope camera lens structure of overall efficiency.

The technical scheme of the utility model is that: the device comprises an objective lens group, an image guide bundle and an objective lens seat, wherein the objective lens group comprises a diaphragm and at least two lenses; the front end of the image guide bundle is connected with the outer end face of the last lens of the objective lens group by UV glue; the objective lens base is in a thin-wall tubular shape, and a plurality of small holes are formed in the side face position, corresponding to the inner lens and the diaphragm, of the tube wall.

The connecting surface of the image guide bundle and the last lens is arranged in the objective lens seat.

The inner wall of the small hole on the opposite side pipe wall is also provided with a groove.

The axis of the small hole deviates from the center of the small hole to the radius of the circle center.

The utility model discloses an endoscope structure can change original rubber coating process into back rubber coating earlier. This has the advantage that the accuracy of the fit between the inner diameter of the tube and the outer diameter of the lens can be further improved and the axial movement of the lens within the tube is facilitated. The tube wall is provided with a plurality of small holes for injecting UV glue (shadowless glue), and after the lens, the diaphragm and the tail end optical fiber are installed in place, glue injection and curing are carried out to obtain the optical fiber. The utility model has the advantages of simple structure, follow-up matched stack is convenient, can improve the cooperation precision of pipe wall and lens, makes between the two realize the minimizing in the clearance, and then can increase the lens diameter or reduce the pipe wall thickness.

Drawings

Figure 1 is a schematic structural view of the present invention,

FIG. 2 is a schematic structural view of the objective lens holder of the present invention;

figure 3 is a view of figure 2 from the left,

FIG. 4 is a schematic view of the optimized structure of the objective lens holder of the present invention;

figure 5 is a left side view of figure 4,

fig. 6 is a schematic structural view of another embodiment of the present invention;

in the figure, 11 is an objective lens I, 12 is an objective lens II, 13 is a diaphragm, 14 is an objective lens III, 2 is an image guide beam, 3 is an objective lens seat, 31 is a small hole, 32 is a groove, 41 is a glue layer I, 42 is a glue layer II, and 43 is a glue layer III.

Detailed Description

The utility model, as shown in fig. 1-6, comprises an objective lens group, an image guide bundle 2 and an objective lens base 3, wherein the objective lens group comprises a diaphragm 13 and at least two lenses; the front end of the image guide bundle 2 is connected with the outer end surface of the last lens (the second objective lens 12 in fig. 1 of the present invention) of the objective lens group by using UV glue to form a first glue layer 41 (shown by a thick solid line in the figure); the objective lens base 3 is in a thin-wall tubular shape, and a plurality of small holes 31 are formed in the side face position, corresponding to the inner lens and the diaphragm, of the tube wall.

The connecting surface of the image guide bundle 2 and the last lens is arranged in the objective lens seat 3.

The small hole 31 is also provided with a groove 32 on the inner wall of the opposite side pipe wall.

The axis of the small hole 31 deviates from the center of the small hole to the radius of the circle center.

In the practice of the present invention, the objective mount 3 is first laser drilled.

Then, the image guide beam 2 is cemented with the second objective lens 12, and after being cured, the image guide beam is inserted into the tail end of the second objective lens seat 2;

thirdly, the first objective lens 11 and the diaphragm 13 (or other objective lenses, such as the third objective lens 14 in fig. 6) are loaded from the front of the objective lens seat and positioned.

Fourthly, injecting UV glue into the small hole, wherein the position of the small hole 31 is generally arranged on the lens (namely the side surface and the connecting part of each objective lens), curing after injecting, forming a glue layer III 43 on the outer surfaces of the objective lens II 12 and the image guide bundle 2, and forming a glue layer II 42 on the positions of the objective lens I11 and the diaphragm 13. And (4) preparing.

Taking three rows of holes as an example, we find that if the laser deviates from the radial direction, it is better to be able to approach the adjacent row as close as possible to the small hole after penetration, and to continue to strike a groove 32 opposite the tube wall for accommodating the function of glue. Therefore, if the amount of glue injected into the small holes 31 is large, the redundant glue solution can be contained in the small holes, so that gluing point positions are increased, and eccentricity is avoided.

The above-described embodiments are merely exemplary illustrations of the present invention, and obvious modifications or equivalents thereof, which may be made by those skilled in the art, should be considered to fall within the scope of the present invention.

Claims

1. The lens structure of the very thin-diameter endoscope comprises an objective lens group, an image guide bundle and an objective lens seat, wherein the objective lens group comprises a diaphragm and at least two lenses; the front end of the image guide bundle is connected with the outer end face of the last lens of the objective lens group by UV glue; the lens holder is characterized in that the objective lens holder is in a thin-wall tubular shape, and a plurality of small holes are formed in the side surface of the tube wall corresponding to the inner lens and the diaphragm.

2. The very fine endoscope lens structure of claim 1, wherein the connecting surface of the image-guiding bundle and the last lens is disposed in the objective mount.

3. The very fine endoscope lens structure of claim 1, wherein the aperture is further grooved in the inner wall of the contralateral tube wall.

4. The very fine endoscope lens structure of claim 1 wherein the pinhole axis is offset from the pinhole aperture center to a circle center radius.