CN113589518A

CN113589518A - Endoscope adapter lens zoom lens barrel

Info

Publication number: CN113589518A
Application number: CN202010360781.0A
Authority: CN
Inventors: 张晓东; 柯重荣; 叶芝
Original assignee: Jiangxi Shenzhou Medical Equipment Co ltd; FUJIAN INSTITUTE OF OPTICAL TECHNOLOGY
Current assignee: Jiangxi Shenzhou Medical Equipment Co ltd; FUJIAN INSTITUTE OF OPTICAL TECHNOLOGY
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2021-11-02

Abstract

The invention relates to an endoscope adapter lens zoom lens cone, which comprises a distance adjusting group guide groove, a compensation group guide groove and a zoom group guide groove; wherein: the central lines of the compensation group guide groove and the zoom group guide groove respectively comprise a linear line segment and a nonlinear line segment, the minimum absolute value of the difference value of the corresponding data of the two groups of central lines is used as an inflection point, the two groups of central lines are mutually in an alternate structure, the lift angle of the linear line segment is kept close to the maximum lift angle value, and the nonlinear line segment is a following line segment. The invention changes the traditional zoom lens barrel design method, adopts the alternation of linear and nonlinear line segments, not only meets the condition of not increasing the maximum lift angle of the guide groove, obviously reduces the corner of the guide groove, improves the rigidity of the cam barrel, reduces the deformation of the cam barrel, maintains the dimensional accuracy of the groove width of the guide groove, and further ensures the imaging quality of the lens.

Description

Endoscope adapter lens zoom lens barrel

The technical field is as follows:

the invention relates to an endoscope adapter lens zoom lens barrel, in particular to a zoom lens barrel of a high-definition imaging adapter lens of a zoom medical endoscope.

Background art:

in the existing switching lenses of various types of medical endoscopes, a zoom switching lens has the advantages of stepless image magnification change relative to a fixed focus switching lens, one lens can be used for observing an operation area with a large view field and a small magnification, and the operation and use of the lens are high in flexibility, so that the zoom switching lens is widely applied.

As shown in fig. 1 and fig. 2, which are schematic diagrams and expanded diagrams of a zoom lens barrel in an endoscope zoom adapter lens, the zoom lens barrel 1 has a distance adjusting group guide slot 2, a compensation group guide slot 3 and a zoom group guide slot 4, and besides the rotation angle of the distance adjusting group guide slot 2 is relatively short, the rotation angle of the compensation group guide slot 3 and the zoom group guide slot 4 is large, which is a main factor affecting the rigidity of the zoom lens barrel. The variable-magnification guide groove 4 and the compensation guide groove 3 have corresponding parameters in different focal sections, and the parameter is larger along with the magnification increase; in the traditional zoom lens barrel design, the center line of one guide groove is designed linearly, the other guide groove is changed according to the parameter size, the center line of the guide groove is in a nonlinear curve, the maximum lift angle of the center line of any guide groove is not more than 45 degrees, the maximum lift angle is also a node for adjusting resistance in a mechanical structure, and therefore the zoom lens barrel design also follows the condition.

How to design a scheme which not only meets the requirement of zoom magnification, but also can reduce the influence on the rigidity of the zoom lens barrel under the constraint of the maximum lift angle is the object of the research of the invention.

The invention content is as follows:

the invention aims to design an endoscope adapter lens zoom lens cone, the center lines of a compensation group guide groove and a zoom group guide groove adopt linear and nonlinear combination.

The technical scheme of the invention is realized as follows: an endoscope adapter lens zoom lens cone comprises a distance adjusting group guide groove, a compensation group guide groove and a zoom group guide groove; the method is characterized in that: the central lines of the compensation group guide groove and the zoom group guide groove respectively comprise a linear line segment and a nonlinear line segment, the minimum absolute value of the difference value of the corresponding data of the two groups of central lines is used as an inflection point, the two groups of central lines are mutually in an alternate structure, the lift angle of the linear line segment is kept close to the maximum lift angle value, and the nonlinear line segment is a following line segment.

The central line of the maximum elevation angle end of the zoom group guide groove is a linear line segment, and the compensation group guide groove is followed; after the inflection point, the center line of the compensation group guide groove is alternately a linear line segment, and the zoom group guide groove is followed.

And the linear line segment of the central line of the zoom group guide groove is positioned at the short-focus end.

The distance adjusting group guide groove, the compensation group guide groove and the zooming group guide groove are not intersected with each other and penetrate through the zoom lens barrel, and two end points of the guide grooves are positioned in the zoom lens barrel.

And the rotation angle difference between the starting points of the guide grooves of the zooming group and the compensation group is 180 degrees.

The invention changes the traditional zoom lens barrel design method, adopts the alternation of linear and nonlinear line segments, not only meets the condition of not increasing the maximum lift angle of the guide groove, obviously reduces the corner of the guide groove, improves the rigidity of the cam barrel, reduces the deformation of the cam barrel, maintains the dimensional accuracy of the groove width of the guide groove, and further ensures the imaging quality of the lens; this also allows the lens barrel to have a larger zoom ratio while ensuring the rigidity of the zoom cam.

Description of the drawings:

the invention is further illustrated with reference to the following specific figures:

FIG. 1 is a schematic view of a conventional zoom lens barrel being unfolded

FIG. 2 is a schematic view of a conventional zoom lens barrel

FIG. 3 is an expanded view of the zoom lens barrel

FIG. 4 is a schematic view of a zoom lens barrel

FIG. 5 is a schematic view of a zoom lens barrel shown in an expanded state

FIG. 6 is a schematic view of a zoom lens barrel

FIG. 7 is a schematic view of a zoom lens barrel in a three-expanded state

FIG. 8 is a three-view diagram of a zoom lens barrel

Wherein

1-zoom lens barrel 2-distance adjusting group guide groove 3-compensation group guide groove

4-variable magnification group guide groove 31, 41-linear line segment 32, 42-non-linear line segment

5-inflection Point

The specific implementation mode is as follows:

referring to fig. 3 to 8, the endoscope adapter lens zoom lens barrel includes a zoom lens barrel 1 body, and a distance adjusting group guide slot 2, a compensation group guide slot 3 and a zoom group guide slot 4 which are provided on the zoom lens barrel, wherein the compensation group guide slot 3 and the zoom group guide slot 4 are processed by calculating a group of corresponding data according to an optical principle; the central lines of the compensation group guide groove 3 and the variable-magnification group guide groove 4 both comprise

linear line segments

31 and 41 and

nonlinear line segments

32 and 42, and the minimum absolute value of the difference value of the corresponding data of the two groups of central lines is taken as an inflection point 5, the two groups of central lines are mutually alternate structures, namely, the central line of the variable-magnification group guide groove 4 is a linear line segment, and the central line of the corresponding compensation group guide groove 3 is a nonlinear line segment; and the lead angle of the

linear segments

31, 41 is kept close to the maximum lead angle value, and the non-linear segments are the

follower segments

32, 42.

More specifically, the center line of the maximum elevation angle end of the zoom group guide groove 4 is a linear line segment 41, or a design that the short focus end is a linear line segment is preferably selected, and the compensation group guide groove 3 is followed; after the inflection point 5, the central line of the compensation group guide groove 3 is alternately a linear line segment 31, and the variable magnification group guide groove 4 is followed.

In addition, the design of the zoom lens barrel 1 also needs to satisfy the requirement that the distance adjusting group guide groove 2, the compensation group guide groove 3 and the zoom group guide groove 4 are not intersected with each other and penetrate through the zoom lens barrel 1, and two end points of the guide grooves are positioned in the zoom lens barrel 1, so that the rigidity of the zoom lens barrel is ensured.

Because the compensation group guide groove 3 and the zoom group guide groove 4 adopt a combination scheme of

linear line segments

31 and 41 and

nonlinear line segments

32 and 42, the total rotation angle is greatly shortened under the constraint of the maximum lift angle, and conversely, the large rotation angle can be properly made on the premise of not more than 180 degrees, so that the lift angle is reduced, and the adjustment hand feeling can be greatly improved. For example, the compensation group guide groove 3 and the magnification-varying group guide groove 4 are controlled within 180 degrees, and the difference in rotation angle between the starting points of the magnification-varying group guide groove 4 and the compensation group guide groove 3 is 180 degrees, as shown in fig. 7 and 8, such a zoom lens barrel 1 is the most thermally stable. The conventional design method that the rotation angle difference of the starting point is zero, as well as the schemes such as fig. 3 and 4 and other rotation angle differences, such as 270 degrees rotation angle difference in fig. 5 and 6, or 90 degrees rotation angle difference, are still not excluded, and the specific choice is to determine how many rotation angle differences are used to distribute the two guide slots according to the rotation angle values, and the 180 degree rotation angle difference is the best preferred scheme.

Claims

1. An endoscope adapter lens zoom lens cone comprises a distance adjusting group guide groove, a compensation group guide groove and a zoom group guide groove; the method is characterized in that: the central lines of the compensation group guide groove and the zoom group guide groove respectively comprise a linear line segment and a nonlinear line segment, the minimum absolute value of the difference value of the corresponding data of the two groups of central lines is used as an inflection point, the two groups of central lines are mutually in an alternate structure, the lift angle of the linear line segment is kept close to the maximum lift angle value, and the nonlinear line segment is a following line segment.

2. The endoscope transit lens zoom lens barrel according to claim 1, characterized in that: the central line of the maximum elevation angle end of the zoom group guide groove is a linear line segment, and the compensation group guide groove is followed; after the inflection point, the center line of the compensation group guide groove is alternately a linear line segment, and the zoom group guide groove is followed.

3. The endoscope transit lens zoom lens barrel according to claim 1 or 2, characterized in that: the linear line segment of the central line of the guide groove of the variable-power group is positioned at the short-focus end.

4. The endoscope transit lens zoom lens barrel according to claim 1 or 2, characterized in that: the distance adjusting group guide groove, the compensation group guide groove and the zooming group guide groove are not intersected with each other and penetrate through the zoom lens barrel, and two end points of the guide grooves are positioned in the zoom lens barrel.

5. The endoscope transit lens zoom lens barrel according to claim 1 or 2, characterized in that: the rotation angle difference between the starting points of the guide grooves of the zooming group and the compensation group is 180 degrees.