Endoscope lens device and method capable of adjusting magnification times and marking view direction

Abstract

According to the endoscope lens device and method capable of adjusting the magnification times and marking the view direction, physical adjustment of the magnification times is achieved by changing the distance between the concave lens and the endoscope lens and the curvature radius of the surface of the concave lens, dependence on electronic magnification is not needed, and loss of image definition is avoided; the visual reference of the visual field direction of endoscopy is provided through the angle mark and the length scale on the protection lens, so that the detection personnel can quickly and accurately determine the direction of the defect; the protective lens is made of a high-impact-resistance material and is subjected to antistatic treatment, so that dust adsorption is reduced, and the durability is improved; according to the design of the shell module, the compatibility with an existing industrial endoscope lens is considered, and the universality and usability of the device are ensured. The defects that the magnification times of existing endoscopy are fixed, and the view direction is not marked are overcome, and the adaptability, accuracy and convenience of endoscopy are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of endoscope inspection, and in particular relates to an endoscope lens device and method capable of adjusting magnification and marking a visual field direction. Background Art

[0002] Industrial endoscope is a non-destructive inspection tool, which is mainly used to observe the internal conditions of equipment or pipelines that are difficult to inspect directly with the naked eye. It is widely used in the inspection of aircraft engines, gas turbines, steam turbines, generators, pipelines and other fields. It can be inspected without disassembling or destroying the equipment.

[0003] However, the current industrial endoscope technology also has the following outstanding deficiencies. First, the industrial endoscope lens generally has a default magnification. Although the magnification can be adjusted by electronically zooming in and out of the endoscope instrument, the clarity of the image will be seriously reduced. Second, when the industrial endoscope is used for inspection, especially for inspection inside the pipeline, there is no mark on the direction of the field of view, and there is no effective reference point inside the pipeline and other components due to the symmetry and similarity of their full-circle shapes, which makes it impossible to determine the location of the defect. Summary of the invention

[0004] The purpose of the present invention is to provide an endoscopic lens device and method with adjustable magnification and marked field of view direction, aiming to solve the shortcomings of existing endoscopic examinations such as fixed magnification and unmarked field of view direction, and to improve the adaptability, accuracy and convenience of endoscopic examinations.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: An endoscope lens device capable of adjusting magnification and marking a visual field direction comprises 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. A protective lens, a concave lens and an elastic sealing ring are fixedly installed inside from left to right, and a fixing screw hole is processed. The top screw connects the shell module to the industrial endoscope lens through the fixing screw hole, and at the same time, it is closely 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 inner cavity of the housing 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 inner cavity of 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:

[0006] 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.

[0007] A further improvement of the present invention is that the diameter of the inner cavity of the shell is larger than the outer diameter of the matching industrial endoscope lens.

[0008] A further improvement of the present invention 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 housing.

[0009] A further improvement of the present invention is that the number of top screws is 3 and is evenly distributed along the circumference of the shell, and the number of fixing screw holes is 3 and is matched with the 3 top screws respectively.

[0010] A further improvement of the present invention is that the diameter of the top screw is not greater than M3, the length is not greater than the thickness of the shell, the entire section has the same diameter and is processed with threads, and a hexagonal countersunk hole is processed at the end.

[0011] A further improvement of the present invention is that the angle markings are evenly distributed along the circumference of the protective lens, are set according to actual use needs, and at least four angle markings of 0°, 90°, 180° and 270° are set.

[0012] A further improvement of the present invention is that the color and line diameter of the length scale are engraved on the edge of the protective lens, and the length is 1 mm or 1 inch.

[0013] A further improvement of the present invention is that the angle mark and the length scale are made by chemical etching or mechanical engraving.

[0014] A further improvement of the present invention is that the concave lens is circular in shape, has the same diameter as the endoscope lens, and has a center thickness 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.

[0015] The method for using the endoscope lens device capable of adjusting magnification and marking the direction of the field of view comprises: 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 at the same time; 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 is made completely coaxial with the endoscope lens, thereby obtaining a clear image of the set magnification; the need for different equivalent focal lengths or magnifications can be achieved by designing and processing concave lenses with different surface curvatures; Through the angle markings on the protective lens, the direction of the inspection field of view can be determined in real time during the endoscopic inspection process, so as to quickly and accurately determine the defect location; at the same time, the length ruler on the protective lens can automatically add a ruler to the photos taken by the endoscope.

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects: The endoscope lens device and method with adjustable magnification and marked field of view provided by the present invention realize physical adjustment of magnification by changing the distance between the concave lens and the endoscope lens, as well as the radius of curvature of the concave lens surface, without relying on electronic magnification, thus avoiding the loss of image clarity; the angle mark and length scale on the protective lens provide an intuitive reference for the field of view direction of the endoscope inspection, so that the inspector can quickly and accurately determine the orientation of the defect; the protective lens is made of high impact resistant material and anti-static treatment is performed to reduce dust adsorption and improve durability; the design of the housing module takes into account compatibility with existing industrial endoscope lenses, ensuring the versatility and ease of use of the device. The present invention provides an endoscope lens device with adjustable magnification and marked field of view direction, which solves the shortcomings of the existing endoscope inspection, such as fixed magnification and no marking of field of view direction, and improves the adaptability, accuracy and convenience of endoscope inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall structure diagram of the endoscope lens device of the present invention capable of adjusting the magnification and marking the direction of the field of view; Figure 2 The present invention is a schematic diagram of the angle marking and 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.

[0018] Description of reference numerals: 1-housing module, 11-hollow cylindrical housing, 12-elastic sealing ring, 13-top screw, 14-fixing screw hole, 2-protective lens, 21-angle mark, 22-length scale, 3-concave lens. DETAILED DESCRIPTION

[0019] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0025] 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.

[0026] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0027] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] Embodiment 1: like Figure 1-2 As shown, the endoscope lens device with adjustable magnification and marked field of view provided by the present invention comprises a shell module 1, a protective lens 2 and a concave lens 3; the shell module 1 comprises a shell 11 and a top screw 13, the shell 11 is in the shape of a hollow cylinder, 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 with the industrial endoscope lens through the fixing screw hole 14, and at the same time, it is tightly matched 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 inner cavity of the shell module 1, and the circumference thereof is engraved with an angle mark and a length scale; the concave lens 3 is installed in the middle of the inner cavity of the shell module 1, and the distance from the protective lens 2 is fixed, and the distance between the concave lens 3 and the industrial endoscope lens is controlled by the distance between the shell 11 and the industrial endoscope lens; the surface curvature radius of the concave lens 3 R satisfy:

[0029] 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.

[0030] Embodiment 2: like Figure 1-2 As shown, the endoscope lens device with adjustable magnification and marked field of view direction provided by the present invention includes a housing module 1, a protective lens 2 and a concave lens 3.

[0031] 1. Assembly of housing module 1 A hollow cylindrical housing 11 is prepared to ensure that its internal dimensions can accommodate the protective lens 2 and the concave lens 3. An elastic sealing ring 12 is installed at the right end of the housing 11 to ensure that it can fit tightly with the outer circle of the industrial endoscope lens to prevent dust, oil and water. A fixing screw hole 14 is processed on the housing 11 to connect the housing module 1 with the industrial endoscope lens through the top screw 13.

[0032] 2. Installation of protective lens 2 The protective lens 2 is made of high impact-resistant materials such as polycarbonate. Polycarbonate has high strength, high toughness, good heat resistance and impact resistance. Its melting point is usually between 220 and 230°C, and its heat deformation temperature can reach 135°C. It has good mechanical properties within the normal use temperature range. In addition, polycarbonate also has good transmission performance and optical quality, and its light transmittance can reach about 90%, which makes it have unique advantages in optical applications. Angle marks 21 and length scales 22 are engraved on the circumference of the protective wafer 2, and are made by chemical etching or mechanical engraving to ensure its durability and precision. The angle mark 21 is used to indicate the reference angle of the wafer when rotating or positioning, which helps to ensure the directional consistency of the wafer during processing or testing. The angle mark is usually engraved on the circumference of the wafer at specific angle intervals (such as every 0°, 90°, 180°, 270°). The length scale 22 provides a reference for linear measurement and is used to measure the feature size on the wafer or the relative position with other components. The length scale can be a continuous scale line or an interval mark point. Chemical etching is to form the desired pattern by exposing the wafer to a specific chemical etching solution and removing part of the material surface by chemical reaction. Mechanical engraving is to form the pattern by using a diamond tool or other hard tool to physically cut or grind on the wafer surface.

[0033] 3. Installation of concave lens 3 The concave lens 3 is installed in the middle of the inner cavity of the housing module 1, and the distance from the protective lens 2 is fixed. The shape of the concave lens 3 is circular, with the same diameter as the endoscope lens, and the center thickness is much smaller than its focal length. The surface curvature radius R of the concave lens 3 is determined according to formula (1) to ensure the equivalent focal length f 'Meet the design requirements.

[0034] (1) in, f’ is the equivalent focal length of the combined lens system, f 1 is the focal length of the concave lens (a negative value), f 2 is the focal length of the endoscope lens (a positive value), d is the distance between the concave lens and the endoscope lens, nis the refractive index of the concave lens material.

[0035] The general procedure for determining the surface curvature radius of the concave lens 3 is: The distance between the concave lens 3 and the endoscope lens is determined according to the length 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. d ; Determine the refractive index of the concave lens 3 material by combining the field of view requirements and the distance of the object to be observed n , focal length of concave lens 3 f 1 and the equivalent focal length of the combined lens system f '; Focal length of endoscope lens f 2Determined by the endoscope lens specifications provided.

[0036] 4. Marking of field of view direction and measurement length The angle mark 21 on the protective lens 2 provides a reference direction for the endoscope field of view, so that the inspector can quickly and accurately determine the orientation of the defect; at the same time, the length scale 22 also provides a reference for the rapid determination of the defect size.

[0037] 5. Testing and Verification After assembly, a sealing performance test is required to ensure that the connection between the outer shell module 1 and the endoscope lens is dustproof, oilproof and waterproof; at the same time, the relative position of the outer shell module 1 and the endoscope lens is fine-tuned near the fixed position through the top screw 13 to ensure the clarity of the imaging.

[0038] 6. Practical Application Install the endoscope lens device on the industrial endoscope, perform actual inspection operations, and evaluate the performance and accuracy of the device based on the inspection results.

[0039] Embodiment 3: 1. Customization of shell module 1 According to different types of industrial endoscope lenses, the shape and size of the housing module 1 are customized to ensure optimal compatibility and sealing.

[0040] The material of the shell 11 is the same as or similar to that of the lens shell of the industrial endoscope, and the diameter of the internal cavity of the shell 11 is larger than the outer diameter of the matched industrial endoscope lens.

[0041] The elastic sealing ring 12 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 hollow cylindrical housing 11. Nitrile rubber is a copolymer formed by polymerization of acrylonitrile and butadiene monomers, and is mainly produced by low-temperature emulsion polymerization. Fluororubber is a polymer elastomer obtained by polymerization of fluorine-containing monomers.

[0042] There are three top screws 13 evenly distributed along the circumference of the hollow cylindrical shell 11 , and there are three fixing screw holes 14 , which are matched with the three top screws 13 respectively.

[0043] 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 has the same diameter and is processed with threads, and a hexagonal countersunk hole is processed at the end.

[0044] 2. Optimization of protective lens 2 The material of the protective lens 2 is optimized, and high impact-resistant 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, so that the static charge that has been generated can be quickly leaked to avoid static electricity accumulation; an anti-reflective coating is added to the protective lens 2 to reduce the glare and reflection of the image. 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 layers of thin films with a refractive index between air and lens materials. The thickness and refractive index of these films are precisely controlled so that the light reflected from the front and back surfaces of the lens can offset each other, thereby reducing the intensity of the reflected light. When the thickness of the film is about one-quarter of the wavelength of the light wave, the light reflected from the inner and outer surfaces of the film will offset each other through destructive interference, achieving the best anti-reflection effect.

[0045] 3. Optimization of angle mark 21 and length mark 22 The angle markings 21 are evenly distributed along the circumference of the protective lens 2. Generally, at least four angle markings of 0°, 90°, 180°, and 270° should be set; the color, wire diameter, etc. of the length scale 22 comply with industry standards or national standards, and is engraved on the edge of the protective lens 2 with a length of 1 mm or 1 inch.

[0046] 4. Material selection of concave lens 3 Optical glass is selected as the material of the concave lens 3, and the surface is covered with an anti-reflection film, the thickness of which is λ / 4 or λ / 2 of the wavelength of white light, so as to improve the light transmittance and imaging quality.

[0047] 5. Device durability and reliability test The device is subjected to long-term durability and reliability tests to ensure that it can work stably in various environments.

[0048] Embodiment 4: like Figure 1-2 As shown, the method for using the endoscope lens device capable of adjusting magnification and marking the direction of the field of view of the present invention comprises: The device is connected to the industrial endoscope lens through the three top screws 13 on the housing module 1, and the elastic sealing ring 12 plays a sealing and damping role at the same time. By fine-tuning the distance between the concave lens 3 and the industrial endoscope lens and adjusting the ejection length of the three top screws 13, the device is completely coaxial with the endoscope lens, thereby obtaining a clear image of the set magnification. For the needs of different equivalent focal lengths or magnifications, it can be achieved by designing and processing concave lenses 3 with different surface curvatures.

[0049] By using the angle mark 21 on the protective lens 2, the direction of the inspection field can be determined in real time during the endoscopic inspection process, so as to quickly and accurately determine the defect location. At the same time, the length scale 22 on the protective lens 2 can be used to automatically add a scale to the photo taken by the endoscope, thereby improving work efficiency and measurement accuracy.

[0050] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0051] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. An endoscope lens device with adjustable magnification and marked field of view direction, characterized in that: It includes 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. A protective lens, a concave lens and an elastic sealing ring are fixedly installed inside from left to right, and a fixing screw hole is processed. The top screw connects the shell module to the industrial endoscope lens through the fixing screw hole, and at the same time, it is closely 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 inner cavity of the housing 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 inner cavity of 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 housing.

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

5. The endoscope lens device with adjustable magnification and marked field of view direction 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 shell thickness, the entire section has the same diameter 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 direction according to claim 1, characterized in that: The angle markings are evenly distributed along the circumference of the protective lens, 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 endoscope 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 at the same time; 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 is made completely coaxial with the endoscope lens, thereby obtaining a clear image of the set magnification; the need for different equivalent focal lengths or magnifications can be achieved by designing and processing concave lenses with different surface curvatures; Through the angle markings on the protective lens, the direction of the inspection field of view can be determined in real time during the endoscopic inspection process, so as to quickly and accurately determine the defect location; at the same time, the length ruler on the protective lens can automatically add a ruler to the photos taken by the endoscope.

Images