3D endoscope

Abstract

The utility model relates to a three-dimensional (3D) endoscope, which comprises a transposed prism, an optical filter, a first bonding lens, a second bonding lens and a biconcave lens which are sequentially arranged from an object side to an image side, the transposed lens is formed by gluing a plano-concave lens and a triple-glued prism, and the plano-concave lens and the triple-glued prism are sequentially arranged from the object side to the image side; the angle value of the transposed prism is 0 degree to 90 degrees. According to the utility model, the structure design is reasonable, the transposed prism is used for replacing a traditional 0-degree prism, the conversion of scene picture angles is completed, simple light angle conversion is carried out on the first 0-degree prism of the endoscope, different viewing direction requirements can be met without redesigning different lenses, the use is convenient and flexible, and the cost is low. Other lenses of the endoscope rear group lens cone are shared by 0 degree, so that the production cost and the production difficulty can be reduced, and the utilization rate of social resources is improved.

Description

Technical field:

[0001] The utility model belongs to the field of medical endoscopes, and in particular relates to a 3D endoscope. Background technology:

[0002] Endoscopes play an indispensable role in medical diagnosis and industrial testing. For example, the main diagnostic method for gastrointestinal diseases is endoscopic examination, and endoscopic examination requires the use of an endoscope. Due to the complex internal environment of the human body, multiple angles need to be observed at the same time, and most of the existing endoscopes observe the working environment at a viewing angle of 0° and cannot observe at a specific angle. In order to meet the different requirements for the working environment of the lens in application scenarios under specific viewing angles, it is often necessary to redesign different lenses, which not only increases the difficulty and cost of design and production, but also indirectly increases the user's cost of use and causes irrational use and waste of social resources.

[0003] To this end, it is necessary to improve the above-mentioned technical problems, and this case arises from this. Utility model content:

[0004] The present invention aims to improve upon the problems existing in the prior art, that is, the technical problem to be solved by the present invention is to provide a 3D endoscope with a reasonable design, which can be used flexibly under a specific viewing angle and observe phenomena observed at a specific angle different from that observed at 0°.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a 3D endoscope, including a transposed prism, a filter, a first cemented lens, a second cemented lens and a biconcave lens, wherein the transposed prism, the filter, the first cemented lens, the second cemented lens and the biconcave lens are arranged in sequence from the object side to the image side.

[0006] Furthermore, the transposed prism is composed of a plano-concave lens and a triple-cemented prism, and the plano-concave lens and the triple-cemented prism are arranged in sequence from the object side to the image side.

[0007] Furthermore, the angle value of the transposed prism is 0°-90°.

[0008] Furthermore, the first cemented lens is a two-cemented lens composed of a positive meniscus lens and a biconvex lens, and the meniscus lens and the biconvex lens are arranged in sequence from the object side to the image side.

[0009] Furthermore, the absolute value of the focal length of the first cemented lens is 1 mm to 5 mm.

[0010] Furthermore, the second cemented lens is a double cemented lens composed of two plano-convex lenses.

[0011] Furthermore, the absolute value of the focal length of the second cemented lens is 10 mm to 30 mm.

[0012] Furthermore, the absolute value of the focal length of the biconcave lens is 1 mm to 10 mm.

[0013] Compared with the prior art, the utility model has the following effects: the utility model has a reasonable structural design, and completes the conversion of scene image angles by replacing the traditional 0° prism with a transposed prism. A simple light angle transformation is performed on the first 0° prism of the endoscope, and different viewing requirements can be met without redesigning different lenses. The utility model is easy and flexible to use, and because the other lenses of the rear group barrel of the endoscope are shared with the 0° lens, the production cost and difficulty can be reduced, and the utilization rate of social resources can be improved. Description of the drawings:

[0014] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0015] Figure 2 It is the MTF transfer function diagram of the embodiment of the utility model;

[0016] Figure 3 It is a point diagram of an embodiment of the utility model;

[0017] Figure 4 It is a distortion diagram of an embodiment of the utility model.

[0018] In the figure:

[0019] L1-transposed prism; L2-filter; L3-first cemented lens; L4-second cemented lens; L5-double concave lens; 1-plano-concave lens; 2-triplet cemented prism; 3-positive meniscus lens; 4-double convex lens; 5-plano-convex lens. Specific implementation method:

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] like Figure 1As shown, the utility model is a 3D endoscope, which is used to solve the limitations of the field of view observed by the existing endoscope at a viewing angle of 0°. It can be used flexibly under a specific viewing angle and observe phenomena different from those observed at a specific angle of 0°. The optical structure of the 3D endoscope includes a transposed prism L1, a filter L2, a first cemented lens L3, a second cemented lens L4 and a biconcave lens L5. When the endoscope is used in a medical environment, the transposed prism, the filter, the first cemented lens, the second cemented lens and the biconcave lens are arranged in sequence from the object side to the image side. By replacing the traditional 0° prism with a transposed prism, the requirements of the endoscope working environment for different viewing angles can be met by only changing the 0° prism, without the need to redesign different lenses, and because the other rear lenses of the endoscope are shared, the cost can be reduced and the utilization rate of social resources can be improved.

[0023] In this embodiment, the transposition prism L1 is composed of a plano-concave lens and a triple-cemented prism, which are arranged in sequence from the object side to the image side. It should be noted that the transposition prism is also called a steering prism, which is used to realize the optical path specialization and change the original optical path direction.

[0024] In this embodiment, the angle value of the transposed prism L1 is 0°-90°, for example, a 30° transposed prism is used.

[0025] In this embodiment, the first cemented lens L3 is a two-cemented lens composed of a positive meniscus lens and a biconvex lens, and the meniscus lens and the biconvex lens are arranged in sequence from the object side to the image side.

[0026] In this embodiment, the absolute value of the focal length of the first cemented lens L3 is 1 mm to 5 mm.

[0027] In this embodiment, the second cemented lens L4 is a two-cemented lens composed of two plano-convex lenses.

[0028] In this embodiment, the absolute value of the focal length of the second cemented lens L4 is 10 mm to 30 mm.

[0029] In this embodiment, the absolute value of the focal length of the biconcave lens L5 is 1 mm to 10 mm.

[0030] In this embodiment, the endoscope achieves the following technical indicators under the working environment: focal length f=2.09mm; field of view 2w=96°; distortion <21%; relative illumination >73%, total optical path length <9.19mm; applicable spectral range is 486~656nm.

[0031] In this embodiment, the optical design parameters of each lens are shown in Table 1.

[0032] Table 1

[0033]

[0034] In this embodiment, in the optical design, through the reasonable design of the lens, such as Figure 1 and Figure 2 As shown, a 30° transposed prism is used on the left side of the filter 2 to correct the imaging quality of the lens, so that the lens has clear image quality in the visible light band of the air environment.

[0035] Reference Figure 2 and Figure 3 , Figure 2 and Figure 3 They are respectively the MTF diagram and the spot diagram of the lens of this embodiment focused in the visible light band in an air environment. By observing the MTF diagram, it can be seen that the MTF line of the central field of view is higher than that of the edge field of view, and the RMS radius of the spot diagram at the central field of view is much smaller than that of the edge field of view, indicating that the image quality of the center of the lens is clearer than that of the edge in imaging.

[0036] Generally, endoscopes can only work in a single working environment. In order to meet working scenarios with different viewing angles, it is often necessary to redesign different lenses. The utility model provides a design concept that maintains the shared lens of the rear group of lenses and replaces the front 0° prism with a multi-angle prism, which can meet the working environment requirements at specific angles. Since the rear group of lenses of the endoscope is shared, that is, the size specifications of the lenses are consistent, the manufacturing cost and production difficulty can be effectively reduced. The problem of redesigning different lenses for different viewing angles is solved. To change the requirements of different viewing angles, it is only necessary to replace the head prism without the need for redesign. It is convenient and flexible to use.

[0037] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except where it is obviously impossible to use an one-piece molding process).

[0038] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.

[0039] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated molding process.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A 3D endoscope, Features: The invention comprises a transposed prism, a filter, a first cemented lens, a second cemented lens and a biconcave lens, wherein the transposed prism, the filter, the first cemented lens, the second cemented lens and the biconcave lens are arranged in sequence from the object side to the image side.

2. A 3D endoscope according to claim 1, Features: The transposed prism is composed of a plano-concave lens and a triple-cemented prism, and the plano-concave lens and the triple-cemented prism are arranged in sequence from the object side to the image side.

3. A 3D endoscope according to claim 1 or 2, Features: The angle value of the transposed prism is 0°-90°.

4. A 3D endoscope according to claim 1, Features: The first cemented lens is a two-cemented lens composed of a positive meniscus lens and a biconvex lens, and the meniscus lens and the biconvex lens are arranged in sequence from the object side to the image side.

5. A 3D endoscope according to claim 1 or 4, Features: The absolute value of the focal length of the first cemented lens is 1 mm to 5 mm.

6. A 3D endoscope according to claim 1, Features: The second cemented lens is a double cemented lens composed of two plano-convex lenses.

7. A 3D endoscope according to claim 1 or 6, Features: The absolute value of the focal length of the second cemented lens is 10 mm to 30 mm.

8. The 3D endoscope according to claim 1, Features: The absolute value of the focal length of the biconcave lens is 1 mm to 10 mm.

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