Endoscope lens device and method for adjusting magnification and marking field direction

Abstract

The present application can adjust the magnification and mark the direction of the field of view of the endoscope lens device and method, by changing the distance between the concave lens and the endoscope lens, and the surface curvature radius of the concave lens, the physical adjustment of the magnification is realized, without relying on electronic amplification, avoiding the loss of image clarity; the intuitive reference of the direction of the field of view of the endoscope examination is provided through the angle mark and length scale on the protective lens, so that the tester can quickly and accurately determine the position of the defect; the protective lens adopts high impact-resistant material and is treated with anti-static, reducing dust adsorption and improving durability; the design of the shell module considers the compatibility with the existing industrial endoscope lens, ensuring the universality and ease of use of the device. The present application solves the problems of fixed magnification and no mark of the direction of the field of view of the existing endoscope examination, and improves the adaptability, accuracy and convenience of the endoscope examination.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of endoscopy, and particularly relates to an endoscope lens device and method capable of adjusting magnification and marking field direction. BACKGROUND

[0002] Industrial endoscopes are non-destructive inspection tools, mainly used for observing the internal conditions of equipment or pipelines that are difficult to directly check with the naked eye, and are widely used in the detection of fields such as aero-engines, gas turbines, steam turbines, generators, and pipelines. They can be used for inspection without disassembling or damaging the equipment.

[0003] However, the current industrial endoscope technology also has the following prominent deficiencies. Firstly, the industrial endoscope lens generally has a default magnification, although the magnification can be adjusted by electronic magnification and reduction of the endoscope instrument, which will seriously reduce the clarity of the image. Secondly, during detection, especially for the detection of the internal part of the pipeline, since the field direction is not marked, and there is no effective reference point in the internal part of the pipeline due to the symmetry and similarity of its full circumference shape, it is difficult to determine the orientation of the defect. SUMMARY

[0004] The purpose of the present application is to provide an endoscope lens device and method capable of adjusting magnification and marking field direction, aiming to solve the problems of fixed magnification and no field direction marking of the existing endoscope inspection, and improve the adaptability, accuracy, and convenience of endoscope inspection.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] The endoscope lens device capable of adjusting magnification and marking field direction comprises an outer shell module, a protective lens, and a concave lens.

[0007] The outer shell module comprises a shell and a top screw. The shell is in the shape of a hollow cylinder, and inside it is fixedly installed from left to right with a protective lens, a concave lens, and an elastic sealing ring, and is processed with a fixed screw hole. The top screw connects the outer shell module with the industrial endoscope lens through the fixed screw hole, and at the same time, it tightly cooperates with the outer circumference of the industrial endoscope lens through the elastic sealing ring.

[0008] The protective lens is installed at the left end of the internal cavity of the outer shell module, and the entire circumference position is marked with an angle mark and a length scale.

[0009] The concave lens is installed in the middle part of the internal cavity of the outer shell module, and the distance to the protective lens is fixed. The distance between the concave lens and the industrial endoscope lens is controlled by the distance between the shell and the industrial endoscope lens. The surface curvature radius of the concave lens R satisfies:

[0010]

[0011] wherein, f’ f is the equivalent focal length of the combined lens system, f 1 is the focal length of the concave lens and is negative, f 2 is the focal length of the endoscope lens and is positive, d d is the distance between the concave lens and the endoscope lens, n n is the refractive index of the material of the concave lens.

[0012] The further improvement of the present application is that the diameter of the cavity inside the shell is larger than the outer diameter of the matched industrial endoscope lens.

[0013] The further improvement of the present application is that the elastic sealing ring is in the form of an O-ring, made of nitrile rubber or fluororubber, and installed in the elastic sealing ring installation groove of the shell.

[0014] The further improvement of the present application is that the number of the jackscrews is three, which are evenly distributed along the circumference of the shell, and the number of the fixed screw holes is three, which are matched with the three jackscrews respectively.

[0015] The further improvement of the present application is that the diameter of the jackscrew is not greater than M3, the length is not greater than the thickness of the shell, the whole section has a consistent diameter and is processed with threads, and the end is processed with an internal hexagonal countersunk hole.

[0016] The further improvement of the present application is that the angle marks are evenly distributed along the circumference of the protective lens, which are set according to the actual use needs, and at least four angle marks of 0°, 90°, 180° and 270° are set.

[0017] The further improvement of the present application is that the color and the line diameter of the length scale are marked on the edge of the protective lens, and the length is 1mm or 1inch.

[0018] The further improvement of the present application is that the angle marks and the length scale are made by chemical etching or mechanical carving.

[0019] The further improvement of the present application is that the shape of the concave lens is circular, which has the same diameter as the endoscope lens and the central thickness is much smaller than the focal length; the surface of the concave lens is covered with an anti-reflection film, and the thickness of the anti-reflection film is λ / 4 or λ / 2 of the wavelength of white light.

[0020] The use method of the endoscope lens device with adjustable magnification and marked visual field direction, comprising:

[0021] The device is connected with the industrial endoscope lens through the jackscrew on the shell module, and the elastic sealing ring simultaneously plays the sealing and damping roles; the distance between the concave lens and the industrial endoscope lens is adjusted, and the jacking length of the jackscrew is adjusted, so that the device is coaxial with the endoscope lens, and clear imaging with a set magnification is obtained; for different equivalent focal lengths or magnifications, the concave lens with different surface curvatures is designed and processed to realize the different equivalent focal lengths or magnifications.

[0022] During the endoscope examination, the direction of the detection field of view is determined in real time through the angle mark on the protective lens, so that the position of defects is quickly and accurately determined; meanwhile, the length scale on the protective lens is used to automatically add a scale to the photo taken by the endoscope.

[0023] Compared with the prior art, the present application has at least the following beneficial technical effects:

[0024] The endoscope lens device and method provided by the present application can adjust the magnification and mark the direction of the field of view, the distance between the concave lens and the endoscope lens is changed, and the surface curvature radius of the concave lens is changed, so that the physical adjustment of the magnification is realized, without relying on electronic magnification, and the loss of image clarity is avoided; the angle mark and the length scale on the protective lens provide an intuitive reference for the direction of the field of view during the endoscope examination, so that the tester can quickly and accurately determine the position of defects; the protective lens is made of high-impact-resistant material and is subjected to anti-static treatment, dust adsorption is reduced, and durability is improved; the design of the shell module considers the compatibility with the existing industrial endoscope lens, ensuring the universality and ease of use of the device. The present application provides an endoscope lens device capable of adjusting the magnification and marking the direction of the field of view, solves the problems of fixed magnification and no marking of the direction of the field of view during the existing endoscope examination, and improves the adaptability, accuracy and convenience of the endoscope examination. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 It is a whole structure diagram of the endoscope lens device capable of adjusting the magnification and marking the direction of the field of view.

[0026] Fig. 2 It is a schematic diagram of the angle mark and the length scale of the protective lens of the endoscope lens device capable of adjusting the magnification and marking the direction of the field of view.

[0027] Explanation of reference signs:

[0028] 1-shell module, 11-hollow cylindrical shell, 12-elastic sealing ring, 13-jackscrew, 14-fixing screw hole, 2-protective lens, 21-angle mark, 22-length scale, 3-concave lens. DETAILED DESCRIPTION

[0029] In the following certain exemplary embodiments are simply described. As will be realized by those skilled in the art, the described embodiments can be modified in various different ways without departing from the spirit or scope thereof. Accordingly, the drawings and descriptions are to be regarded as illustrative in nature rather than restrictive.

[0030] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0031] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0032] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, or communication; can be direct connection, or indirect connection through intermediate medium; can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Below", "under" and "under" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0035] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0036] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0037] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] Example 1:

[0039] like Figs. 1-2 As shown, the endoscope lens device with adjustable magnification and marked field of view provided by the present invention includes a shell module 1, a protective lens 2 and a concave lens 3; the shell module 1 includes a shell body 11 and a top screw 13, the shell body 11 is a hollow cylindrical shape, and the protective lens 2, the concave lens 3 and the elastic sealing ring 12 are fixedly installed inside from left to right, and a fixing screw hole 14 is processed. The top screw 13 connects the shell module 1 to the industrial endoscope lens through the fixing screw hole 14, and at the same time closely fits with the outer circumference of the industrial endoscope lens through the elastic sealing ring 12; the protective lens 2 is installed at the left end of the internal cavity of the shell module 1, and the angle mark and length scale are engraved on the entire circumference of the circumference; the concave lens 3 is installed in the middle of the internal cavity of the shell module 1, and the distance from the protective lens 2 is fixed. The distance between the concave lens 3 and the industrial endoscope lens is controlled by the distance between the shell body 11 and the industrial endoscope lens; the surface curvature radius of the concave lens 3 R satisfy:

[0040]

[0041] in, f’ is the equivalent focal length of the combined lens system, f 1 is the focal length of the concave lens and is a negative value. f 2 is the focal length of the endoscope lens and is a positive value.d is the distance between the concave lens and the endoscope lens, n is the refractive index of the concave lens material.

[0042] Example 2:

[0043] like Figs. 1-2 As shown, the endoscope lens device with adjustable magnification and marked field of view provided by the present invention includes a housing module 1, a protective lens 2 and a concave lens 3.

[0044] 1. Assembly of housing module 1

[0045] Prepare a hollow cylindrical housing 11, ensuring its internal dimensions are large enough to accommodate the protective lens 2 and concave lens 3. Install an elastic sealing ring 12 at the right end of the housing 11 to ensure it fits tightly against the outer diameter of the industrial endoscope lens, providing dust, oil, and water resistance. Machine a fixing screw hole 14 in the housing 11 for connecting the housing module 1 to the industrial endoscope lens via a set screw 13.

[0046] 2. Installation of protective lens 2

[0047] The protective lens 2 is made of a highly impact-resistant material such as polycarbonate. Polycarbonate offers high strength, toughness, and excellent heat and impact resistance. Its melting point is typically between 220°C and 230°C, with a heat distortion temperature of up to 135°C, maintaining excellent mechanical properties within normal operating temperatures. Polycarbonate also offers excellent transmittance and optical quality, with a light transmittance of approximately 90%, making it uniquely advantageous for optical applications. Angle markings 21 and a length scale 22 are engraved around the circumference of the protective wafer 2, using chemical etching or mechanical engraving to ensure durability and precision. Angle markings 21 indicate the reference angle for wafer rotation or positioning, helping to ensure consistent wafer orientation during processing or testing. Angle markings are typically engraved on the wafer circumference at specific angular intervals (e.g., every 0°, 90°, 180°, or 270°). The length scale 22 provides a reference for linear measurements, useful for measuring feature dimensions on the wafer or its relative position to other components. The length scale can be a continuous scale line or spaced markings. Chemical etching involves exposing the wafer to a specific chemical etching solution, which uses a chemical reaction to remove a portion of the material surface to create the desired pattern. Mechanical engraving involves physically cutting or grinding the wafer surface using a diamond tool or other hard tool to create a pattern.

[0048] 3. Installation of concave lens 3

[0049] The concave lens 3 is installed in the middle of the internal cavity of the housing module 1, and is fixed at a distance from the protective lens 2. The concave lens 3 is circular in shape and has the same diameter as the endoscope lens, and the central thickness is much smaller than the focal length. The surface curvature radius R of the concave lens 3 is determined according to formula (1) to ensure that the equivalent focal length f meets the design requirements.

[0050] (1)

[0051] wherein, f’ is the equivalent focal length of the combined lens system, f 1 is the focal length of the concave lens (negative value), f 2 is the focal length of the endoscope lens (positive value), d is the distance between the concave lens and the endoscope lens, n is the refractive index of the material of the concave lens.

[0052] The general procedure for determining the surface curvature radius of the concave lens 3 is as follows:

[0053] According to the length dimension of the housing module 1, the installation position of the concave lens 3, and the connection position of the top screw 13 and the endoscope lens, the distance between the concave lens 3 and the endoscope lens is determined d ; the refractive index of the material of the concave lens 3, the focal length n 1 of the concave lens 3, and the equivalent focal length f ’ of the combined lens system are determined according to the combined field of view range requirement and the distance of the object to be observed; and the focal length f 2 of the endoscope lens is determined according to the provided endoscope lens specifications. f

[0054] 4. Marking of field of view direction and measurement length

[0055] The angle mark 21 on the protective lens 2 provides a reference direction for the field of view of the endoscope, allowing the tester to quickly and accurately determine the orientation of the defect; at the same time, the length scale 22 also provides a reference for the quick determination of the size of the defect.

[0056] 5. Testing and verification

[0057] After assembly is completed, a sealing performance test is required to ensure that the connection part of the housing module 1 and the endoscope lens is dustproof, oilproof and waterproof; at the same time, the relative position of the housing module 1 and the endoscope lens is adjusted near the fixed position by the top screw 13 to ensure the clarity of the image.

[0058] 6. Actual application

[0059] The endoscope lens device is installed on an industrial endoscope for actual detection operation, and the performance and accuracy of the device are evaluated according to the detection results. ​

[0060] Example 3:

[0061] 1. Customization of the housing module 1

[0062] The shape and size of the housing module 1 are customized according to different types of industrial endoscope lenses to ensure optimal compatibility and sealing.

[0063] The material of the shell 11 is the same as or similar to that of the industrial endoscope lens shell, and the internal cavity diameter of the shell 11 is greater than the outer diameter of the matched industrial endoscope lens.

[0064] The elastic sealing ring 12 is in the form of an O-ring and is made of nitrile rubber or fluororubber, and is installed in the elastic sealing ring installation groove of the hollow cylindrical shell 11. Nitrile rubber is a copolymer polymerized from acrylonitrile and butadiene monomers, mainly produced by low-temperature emulsion polymerization. Fluororubber is a high-molecular elastomer obtained by polymerization of fluorine-containing monomers.

[0065] The number of top screws 13 is three, which are uniformly distributed along the circumference of the hollow cylindrical shell 11, and the number of fixed screw holes 14 is three, which are matched with the three top screws 13 respectively.

[0066] The diameter of the top screw 13 is not greater than M3, and the length is not greater than the thickness of the hollow cylindrical shell 11, the entire section is consistent in diameter and is processed with threads, and an internal hexagonal countersunk hole is processed at the end.

[0067] 2. Optimization of the protective lens 2

[0068] The material of the protective lens 2 is optimized, and high-impact materials such as polycarbonate are selected to improve its impact resistance and optical quality; anti-static treatment is performed to reduce dust adsorption. The main principle of anti-static treatment is to form a conductive layer on the surface of the material, thereby reducing its surface resistivity, allowing the static charge to leak quickly and avoiding the accumulation of static electricity; an anti-reflective coating is added to the protective lens 2 to reduce image glare and reflection. The main function of the anti-reflective coating is to reduce the reflection of light by the lens, thereby reducing the interference of glare and stray light on vision. The anti-reflective coating is usually composed of one or more thin films with a refractive index between air and the material of the lens. The thickness and refractive index of these thin films are precisely controlled to allow the light reflected from the front and back surfaces of the lens to cancel each other out, thereby reducing the intensity of the reflected light. When the thickness of the thin film is about one-fourth of the wavelength of the light, the light reflected from the inner and outer surfaces of the thin film will cancel each other out through destructive interference, achieving the best anti-reflective effect.

[0069] 3. Optimization of the angle identifier 21 and the length identifier 22

[0070] The angle marks 21 are evenly distributed along the circumference of the protective lens 2, and at least four angle marks, such as 0°, 90°, 180° and 270°, should be provided. The length scale 22 is colored and has a line diameter complying with the industry standard or national standard, and is marked on the edge of the protective lens 2, with a length of 1 mm or 1 inch.

[0071] 4. Material selection of the concave lens 3

[0072] Optical glass is selected as the material of the concave lens 3, and an antireflection film is coated on the surface of the concave lens 3, with a thickness of λ / 4 or λ / 2 of the white light wavelength, so as to improve the light transmittance and imaging quality.

[0073] 5. Durability and reliability test of the device

[0074] The device is subjected to a long-term durability and reliability test to ensure that it can work stably under various environments.

[0075] Embodiment 4:

[0076] As shown in Figs. 1-2 the use method of the endoscope lens device with adjustable magnification and marked visual field direction of the present application, comprising:

[0077] The device is connected with the industrial endoscope lens through the three jackscrews 13 on the shell module 1, and the elastic sealing ring 12 simultaneously plays a sealing and damping role. The distance between the concave lens 3 and the industrial endoscope lens is adjusted, and the protruding length of the three jackscrews 13 is adjusted, so that the device is coaxial with the endoscope lens, and clear imaging with a set magnification is obtained. For different equivalent focal lengths or magnifications, the concave lens 3 with different surface curvatures can be designed and processed to achieve the requirement.

[0078] During the endoscopic examination, the direction of the detection visual field can be determined in real time through the angle marks 21 on the protective lens 2, so that the defect position can be quickly and accurately determined. Meanwhile, the length scale 22 on the protective lens 2 can automatically add a scale to the photo taken by the endoscope, thereby improving the work efficiency and measurement accuracy.

[0079] The basic principles and main features of the present application and the advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0080] Furthermore, it should be understood that although the specification is described in terms of embodiments, each of which contains only a single independent technical solution, the specification is merely for clarity and the skilled person should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that the skilled person can understand. The above is only to illustrate the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made on the basis of the technical idea of the present application, which is within the scope of the technical solutions, falls within the protection scope of the claims of the present application.

Claims

1. An endoscope lens device with adjustable magnification and marked field of view direction, characterized in that: Including a housing module, a protective lens and a concave lens; The shell module includes a shell and a top screw. The shell is a hollow cylindrical shape. From left to right, a protective lens, a concave lens and an elastic sealing ring are fixedly installed inside. There are also fixed screw holes. The top screw connects the shell module to the industrial endoscope lens through the fixed screw holes. At the same time, it is tightly matched with the outer circumference of the industrial endoscope lens through the elastic sealing ring. The protective lens is installed at the left end of the cavity inside the shell module, and angle marks and length scales are engraved on the entire circumference of the lens. The concave lens is installed in the middle of the cavity inside the shell module, and the distance from the protective lens is fixed. The distance between the concave lens and the industrial endoscope lens is controlled by the distance between the shell and the industrial endoscope lens; the surface curvature radius of the concave lens R satisfy: in, f’ is the equivalent focal length of the combined lens system, f 1 is the focal length of the concave lens and is a negative value. f 2 is the focal length of the endoscope lens and is a positive value. d is the distance between the concave lens and the endoscope lens, n is the refractive index of the concave lens material.

2. The endoscope lens device with adjustable magnification and marked field of view direction according to claim 1, characterized in that: The diameter of the inner cavity of the shell is larger than the outer diameter of the matched industrial endoscope lens.

3. The endoscope lens device with adjustable magnification and marked field of view direction according to claim 1, characterized in that: The elastic sealing ring is in the form of an O-ring, made of nitrile rubber or fluororubber, and is installed in the elastic sealing ring installation groove of the shell.

4. The endoscope lens device with adjustable magnification and marked field of view direction according to claim 1, characterized in that: There are 3 top screws evenly distributed along the circumference of the shell, and there are 3 fixing screw holes, which are matched with the 3 top screws respectively.

5. The endoscope lens device with adjustable magnification and marked field of view according to claim 1, characterized in that: The diameter of the top screw is not greater than M3, the length is not greater than the thickness of the shell, the diameter of the entire section is consistent and is processed with threads, and a hexagonal countersunk hole is processed at the end.

6. The endoscope lens device with adjustable magnification and marked field of view according to claim 1, characterized in that: The angle markings are evenly distributed along the circumference of the protective lens and are set according to actual use needs, and at least four angle markings of 0°, 90°, 180° and 270° are set.

7. The endoscope lens device with adjustable magnification and marked field of view direction according to claim 1, characterized in that: The length scale color and line diameter are engraved on the edge of the protective lens, and the length is 1mm or 1inch.

8. The endoscope lens device with adjustable magnification and marked field of view direction according to claim 1, characterized in that: Angle markings and length scales are produced by chemical etching or mechanical engraving.

9. The endoscope lens device with adjustable magnification and marked field of view direction according to claim 1, characterized in that: The concave lens is circular in shape, with the same diameter as the endoscope lens, and the center thickness is much smaller than its focal length; the surface of the concave lens is covered with an anti-reflection film, and the thickness of the anti-reflection film is λ / 4 or λ / 2 of the wavelength of white light.

10. The method for using the endoscopic lens device with adjustable magnification and marked field of view direction according to any one of claims 1 to 9, characterized in that: include: The device is connected to the industrial endoscope lens through the top screw on the housing module, and the elastic sealing ring plays a sealing and damping role. By fine-tuning the distance between the concave lens and the industrial endoscope lens and adjusting the ejection length of the top screw, the device and the endoscope lens are made completely coaxial, thereby obtaining a clear image of the set magnification. To meet the needs of different equivalent focal lengths or magnifications, concave lenses with different surface curvatures are designed and processed. The angle markings on the protective lens allow the direction of the inspection field to be determined in real time during endoscopic inspection, allowing the defect location to be quickly and accurately determined. At the same time, the length scale on the protective lens automatically adds a scale to the photos taken with the endoscope.

Images