Lens assembly, endoscope probe and endoscope

Abstract

The embodiment of the utility model provides a lens assembly, an endoscope probe and an endoscope. The lens assembly comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from the object side to the image side in the optical axis direction. The first lens has negative focal power; the second lens has negative focal power; the third lens has positive focal power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive focal power; the sixth lens has negative focal power; and the seventh lens has zero focal power. By arranging the seven groups of mutually matched lenses, the lens assembly has the advantages of small size, large field angle, long rear focal length and large depth of field, so that the problem that the field of view is limited can be effectively avoided, and the detection precision of the endoscope can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of endoscopes, and in particular relates to a lens assembly, an endoscope probe and an endoscope. Background Art

[0002] An industrial endoscope is a device used to inspect and observe the internal conditions of industrial equipment. It can be inserted into the equipment through a narrow inspection port and detect surface defects inside the equipment. It is widely used in aviation, automobiles, ships, electrical and other fields.

[0003] In the prior art, the probe of an industrial endoscope usually includes at least one lens assembly, which is used to collect image data, thereby accurately detecting surface defects inside the device. However, due to the limitation of the use space, it is usually necessary to reduce the size of the lens assembly, which will limit the field of view of the industrial endoscope and affect the detection accuracy of the industrial endoscope. Summary of the invention

[0004] The present application aims to provide a lens assembly, an endoscope probe and an endoscope, so as to solve the problem that the field of view of the industrial endoscope is limited due to the reduction in size of the existing lens assembly, thereby affecting the detection accuracy of the industrial endoscope.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses a lens assembly, the lens assembly comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from an object side to an image side along an optical axis;

[0007] The first lens has negative optical power;

[0008] The second lens has negative optical power;

[0009] The third lens has positive optical power;

[0010] The fourth lens has positive or negative optical power;

[0011] The fifth lens has positive optical power;

[0012] The sixth lens has negative optical power;

[0013] The seventh lens has zero optical power.

[0014] Optionally, the object-side surface of the first lens is a plane or a convex surface, and the image-side surface of the first lens is a concave surface;

[0015] And / or, the object side surface of the third lens is a plane or a convex surface, and the image side surface of the third lens is a convex surface.

[0016] Optionally, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;

[0017] Alternatively, the object-side surface of the second lens is a flat surface, and the image-side surface of the second lens is a concave surface.

[0018] Optionally, both the object-side surface and the image-side surface of the fourth lens are convex surfaces;

[0019] Alternatively, the object-side surface of the fourth lens is a convex surface, and the image-side surface of the fourth lens is a concave surface.

[0020] Optionally, the fifth lens and the sixth lens are cemented lenses;

[0021] Among them, the object side surface and the image side surface of the fifth lens are both convex surfaces, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface.

[0022] Optionally, the lens assembly further includes an eighth lens and a ninth lens sequentially arranged along the optical axis direction;

[0023] The eighth lens and the ninth lens are disposed between the fourth lens and the fifth lens, and the eighth lens is disposed close to the fourth lens;

[0024] The eighth lens has negative refractive power, and the ninth lens has positive refractive power.

[0025] Optionally, the eighth lens and the ninth lens are cemented lenses;

[0026] Among them, the object side surface and the image side surface of the eighth lens are both concave surfaces, and the object side surface and the image side surface of the ninth lens are both convex surfaces.

[0027] In a second aspect, the present application further discloses an endoscopic probe, the endoscopic probe having a first direction and a second direction perpendicular to each other, the endoscopic probe comprising: two imaging chips and two lens assemblies as described in any one of the above;

[0028] The two lens assemblies are arranged in parallel along the first direction;

[0029] One of the imaging chips is arranged on the light-emitting side of one of the lens assemblies, and two of the imaging chips are arranged back to back along the second direction. The imaging chip is used to receive the light introduced by the lens assembly and form an image.

[0030] Optionally, the endoscopic probe further comprises an illumination optical fiber, which is extended along the first direction and avoids the lens assembly, and a light-emitting side of the illumination optical fiber is located on the same side as a light-incoming side of the lens assembly.

[0031] In a third aspect, the present application also discloses an endoscope, which includes the above-mentioned endoscopic probe.

[0032] In the embodiment of the present application, seven groups of lenses are provided, and the first lens has a negative optical power, the second lens has a negative optical power, the third lens has a positive optical power, the fourth lens has a positive optical power or a negative optical power, the fifth lens has a positive optical power, the sixth lens has a negative optical power, and the seventh lens has a zero optical power. After testing, the total optical length of the lens assembly of the embodiment of the present application is ≤5.51mm, the maximum field of view angle in the diagonal direction can reach 140°, the back focal length can reach 1.4mm, and the depth of field can reach 75mm. That is, the embodiment of the present application can provide seven groups of lenses that cooperate with each other, so that the lens assembly has the advantages of small size, large field of view angle, back focal length, and large depth of field, thereby effectively avoiding the problem of limited field of view, which is conducive to improving the detection accuracy of industrial endoscopes.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 is a structural schematic diagram of a lens assembly provided in an embodiment of the present application;

[0036] Figure 2 This is one of the structural schematic diagrams of an endoscope probe provided in an embodiment of the present application;

[0037] Figure 3 This is the second structural schematic diagram of an endoscope probe provided in an embodiment of the present application;

[0038] Figure 4 This is the third structural schematic diagram of an endoscopic probe provided in an embodiment of the present application.

[0039] Figure numerals: 100. Lens assembly, 101. First lens, 102. Second lens, 103. Third lens, 104. Fourth lens, 105. Fifth lens, 106. Sixth lens, 107. Seventh lens, 108. Eighth lens, 109. Ninth lens, 110. Protective glass, 111. Aperture, 200. Imaging chip, 201. Imaging surface, 300. Illumination optical fiber, 400. Circuit board, 500. Lens holder, 501. Fixing part, 600. Temperature sensor, X. First direction, Y. Second direction. DETAILED DESCRIPTION

[0040] Embodiments of the present invention will be described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0041] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0042] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, 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.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] An industrial endoscope is a device used to inspect and observe the internal conditions of industrial equipment. Taking the inspection of the condition of the compressor blades of an engine as an example, when using it, the probe of the industrial endoscope is inserted from the narrow inspection port into the vicinity of the compressor blades. The inspector observes and analyzes the inspection image and can find different forms of damage, such as cracks, notches, pits, and falling blocks. After discovering these damages, you can also take photos and videos, and use corresponding measurement methods to measure the size of the defects, such as measuring the area of ​​notches and falling blocks, measuring the depth of pits, and measuring the length of cracks.

[0045] In the prior art, the probe of an industrial endoscope is roughly cylindrical in shape and usually includes at least one lens assembly 100, which is used to collect image data, thereby accurately detecting surface defects inside the device. Due to the limitation of the use space, the probe needs to be continuously miniaturized, and its radial size is also continuously reduced, from the original 10mm, 8mm, to 6mm, and then to 4mm. Therefore, it is necessary to further reduce the size of the lens assembly 100 to adapt to the 4mm endoscope probe, which will inevitably limit the field of view of the lens assembly 100, thereby affecting the detection accuracy of the industrial endoscope.

[0046] An embodiment of the present application provides a lens assembly 100 , and the lens assembly 100 of the present application is described in detail below with reference to the accompanying drawings.

[0047] Reference Figure 1 , shows a schematic structural diagram of a lens assembly 100 provided in an embodiment of the present application, such as Figure 1 As shown, the present application provides a lens assembly 100, which includes: a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106 and a seventh lens 107, which are arranged in sequence from the object side to the image side along the optical axis; the first lens 101 has a negative optical focal power; the second lens 102 has a negative optical focal power; the third lens 103 has a positive optical focal power; the fourth lens 104 has a positive optical focal power or a negative optical focal power; the fifth lens 105 has a positive optical focal power; the sixth lens 106 has a negative optical focal power; and the seventh lens 107 has a zero optical focal power.

[0048] In the embodiment of the present application, seven groups of lenses are provided, and the first lens 101 has a negative optical power, the second lens 102 has a negative optical power, the third lens 103 has a positive optical power, the fourth lens 104 has a positive optical power or a negative optical power, the fifth lens 105 has a positive optical power, the sixth lens 106 has a negative optical power, and the seventh lens 107 has a zero optical power. After testing, the total optical length of the lens assembly 100 of the embodiment of the present application is ≤5.51mm, the maximum field of view angle in the diagonal direction can reach 140°, the back focal length can reach 1.4mm, and the depth of field can reach 75mm. That is, the embodiment of the present application can provide seven groups of lenses that cooperate with each other, so that the lens assembly 100 has the advantages of small size, large field of view angle, back focal length, and large depth of field, thereby effectively avoiding the problem of limited field of view, which is conducive to improving the detection accuracy of industrial endoscopes.

[0049] It should be noted that, for the sake of convenience, the drawings of this application appropriately exaggerate the thickness, size and shape of the lenses, that is, the lenses in the drawings of this application are only for illustration. In addition, the object side of each lens refers to the surface of the lens close to the object, and the image side of each lens refers to the surface of the lens close to the imaging side.

[0050] In practical applications, the first lens 101 has a negative focal length, which can make the light diverge, so that the light of a larger angle can enter the first lens 101 as much as possible, which can not only increase the light flux and improve the imaging quality; but also reduce the light path of the light on the light-emitting side of the first lens 101, so that the total optical length is smaller, which is conducive to the miniaturization of the lens assembly 100. In one embodiment, the object side of the first lens 101 is a plane, and the image side of the first lens 101 is a concave surface. This lens structure is simple, easy to process, and conducive to reducing the processing cost. In another embodiment, the object side of the first lens 101 is a convex surface, and the image side of the first lens 101 is a concave surface. In this way, on the one hand, more light with a large field of view angle can be collected to enter the rear lens, thereby further increasing the light flux and improving the imaging quality. On the other hand, when the humidity of the external environment is high, water vapor condenses into water droplets on the object side of the first lens 101, and the convex surface is more convenient for the water droplets to slide down, reducing the interference of the water droplets on the imaging. It should be noted that the total optical length refers to the distance from the object side surface of the first lens 101 to the imaging surface 201 in the optical axis direction.

[0051] The second lens 102 has a negative optical power. Specifically, its object side surface may be a concave surface, and its image side surface may be a convex surface; or its object side surface is a flat surface, and its image side surface is a concave surface. The coordination of the optical power and the surface shape of the second lens 102 is not only conducive to further divergence of light, so that the light trend transitions smoothly, but also conducive to the light of a large field of view angle entering the lens behind it as much as possible, so as to increase the light transmission of the lens assembly 100.

[0052] The third lens 103 has positive focal length, which can better converge light. Specifically, the object side and image side of the third lens 103 are both convex, so that the light between the front and rear lenses, that is, the second lens and the fourth lens, can smoothly transition, allowing the light to smoothly enter the rear lens. On the one hand, it can reduce the aberration caused by the large field of view angle light entering through the second lens; on the other hand, it can make the structure between adjacent lenses compact, thereby reducing the total optical length of the lens assembly 100, which is conducive to the miniaturization of the lens assembly 100.

[0053] The fourth lens 104 has positive focal power or negative focal power. When the fourth lens 104 has positive focal power, when both the object side surface and the image side surface of the fourth lens 104 are convex surfaces, the aberration generated by the lens before the fourth lens 104 can be corrected, and the light can be converged again, thereby shortening the total optical length of the lens assembly 100, which is conducive to the miniaturization of the lens assembly 100. When the fourth lens 104 has negative focal power, when the object side surface of the fourth lens 104 is convex and the image side surface of the fourth lens 104 is concave, the light can be converged again, thereby shortening the total optical length of the lens assembly 100, which is conducive to the miniaturization of the lens assembly 100.

[0054] The fifth lens 105 has positive focal power, and the sixth lens 106 has negative focal power. Specifically, the object side surface and the image side surface of the fifth lens 105 are both convex surfaces, the object side surface of the sixth lens 106 is a concave surface, and the image side surface of the sixth lens 106 is a convex surface. Through the cooperation of the two lenses, the light transmitted by the fourth lens 104 can be smoothly transferred to the sixth lens 106 through the fifth lens 105, and the total optical length of the lens assembly 100 can be reduced. In addition, since the fifth lens 105 and the sixth lens 106 are cemented lenses, on the one hand, there can be no air gap between the two lenses, thereby reducing the total optical length of the lens assembly 100, which is conducive to the miniaturization of the lens assembly 100. On the other hand, the overall chromatic aberration of the lens assembly 100 can be corrected, which is conducive to improving the imaging quality.

[0055] The seventh lens 107 has zero focal power. In one embodiment, the seventh lens 107 is a prism for changing the direction of light. In one embodiment, the object side and the image side of the prism are both flat, so that the direction of light can be changed. In another embodiment, Figure 4 As shown, the object side surface of the prism is convex at a position corresponding to the sixth lens 106 to form a convex portion, so that the light can be converged while changing the direction of the light. In another embodiment, the object side surface is concave at a position corresponding to the sixth lens 106 to form a concave portion, so that the light can be diverged while changing the direction of the light.

[0056] Specifically, the prism is a triangular prism, which includes an object side surface and an image side surface that are perpendicular to each other, and the image side surface is fixedly connected to the imaging chip 200; the center line of the object side surface coincides with the center line of the lens; and the center line of the image side surface coincides with the center line of the imaging chip 200. In this way, by aligning the center line of the object side surface of the prism with the center line of the lens in front of it, and aligning the center line of the image side surface with the center line of the imaging chip 200, the image can be clear and without skew, which is conducive to improving the detection accuracy of the endoscope.

[0057] It should be noted that, in one of the embodiments, the cross section of the prism is an isosceles right triangle, which can cause total reflection of light and change the direction of the light by 90°. In addition, the embodiment of the present application does not limit the fixed connection method between the prism and the imaging chip 200. In one of the embodiments, the image side of the prism is bonded to the surface of the imaging chip 200 by a semiconductor bonding process.

[0058] In addition, an aperture 111 may be provided between the fourth lens 104 and the fifth lens 105. The aperture 111 can not only improve the imaging quality of the lens assembly 100 by converging the light entering the lens assembly 100, but also reduce the size of the lens on the light exiting side of the aperture 111, which is conducive to the miniaturization of the lens assembly 100. In practical applications, a protective glass 110 is further provided between the seventh lens 107 and the imaging surface 201 to prevent damage to components used for imaging, such as the imaging chip 200.

[0059] In some optional embodiments of the present application, the lens assembly 100 further includes an eighth lens 108 and a ninth lens 109 sequentially arranged along the optical axis direction; the eighth lens 108 and the ninth lens 109 are arranged between the fourth lens 104 and the fifth lens 105, and the eighth lens 108 is arranged close to the fourth lens 104; the eighth lens 108 has a negative optical focal length, and the ninth lens 109 has a positive optical focal length. The eighth lens 108 and the ninth lens 109 are cemented lenses; the object side surface and the image side surface of the eighth lens 108 are both concave surfaces, and the object side surface and the image side surface of the ninth lens 109 are both convex surfaces.

[0060] In the embodiment of the present application, since a cemented lens formed by cementing an eighth lens 108 and a ninth lens 109 is further provided between the fourth lens 104 and the fifth lens 105, the overall chromatic aberration of the lens assembly 100 can be further corrected, which is beneficial to improving the imaging quality. Among them, the eighth lens 108 has a negative focal length, and the ninth lens 109 has a positive focal length. Specifically, the object side surface and the image side surface of the eighth lens 108 are both concave surfaces, and the object side surface and the image side surface of the ninth lens 109 are both convex surfaces. Through the mutual cooperation of the two lenses, the light transmitted by the fourth lens 104 can be smoothly transferred to the ninth lens 109 through the eighth lens 108, and the total optical length of the lens assembly 100 can be reduced. In addition, since the eighth lens 108 and the ninth lens 109 are cemented lenses, on the one hand, there can be no air gap between the two lenses, thereby reducing the total optical length of the lens assembly 100, which is beneficial to the miniaturization of the lens assembly 100. On the other hand, the overall chromatic aberration of the lens assembly 100 can be corrected, which is beneficial to improving the imaging quality.

[0061] It should be noted that, in the embodiment of the present application, the distance from the image side surface of the ninth lens 109 to the imaging surface 201 in the optical axis direction is the back focal length of the lens assembly 100. By reasonably controlling the proportional relationship between the back focal length and the total optical length, the back focal length can be achieved on the basis of miniaturization of the optical lens, which facilitates the assembly of the lens assembly 100.

[0062] A specific embodiment of the lens assembly 100 that meets the above requirements is provided below.

[0063] like Figure 1 As shown, the lens assembly 100 includes: a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, an eighth lens, a ninth lens, a fifth lens 105, a sixth lens 106 and a seventh lens 107, which are arranged in sequence from the object side to the image side along the optical axis.

[0064] Among them, the first lens 101 has negative optical power, its object side surface S1 is a plane, and its image side surface S2 is a concave surface. The second lens 102 has negative optical power, its object side surface S3 is a concave surface, and its image side surface S4 is a convex surface. The third lens 103 has positive optical power, and its object side surface S5 and image side surface S6 are both convex surfaces. The fourth lens 104 has negative optical power, its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface. The eighth lens 108 has negative optical power, and its object side surface S9 and image side surface S10 are both concave surfaces. The ninth lens 109 has positive optical power, and its object side surface S10 and image side surface S11 are both convex surfaces. The fifth lens 105 has positive optical power, and its object side surface S12, image side surface and S13 are both convex surfaces. The sixth lens 106 has negative optical power, its object side surface S13 is a concave surface, and its image side surface S14 is a convex surface. The seventh lens 107 has zero optical power, and its object-side surface S15 and image-side surface S16 are both planes.

[0065] The lens assembly 100 preferably includes an aperture 111, which is disposed between the fourth lens 104 and the eighth lens 108 to improve the imaging quality. In addition, the lens assembly 100 also includes a protective glass 110, and the object side surface S17 and the image side surface S18 of the protective glass 110 are both flat to prevent damage to the components used for imaging, such as the imaging chip 200.

[0066] Table 1 shows the curvature radius, thickness and diameter of each lens of the lens assembly 100. It can be understood that the object plane refers to the surface of the object, and the imaging plane 201 refers to the surface of the imaging chip 200. In addition, the thickness of the row where S1 is located is the center thickness of the first lens 101, the thickness of the row where S2 is located is the air space between the first lens 101 and the second lens 102, and so on.

[0067] Table 1

[0068]

[0069]

[0070] After testing, the total optical length of the lens assembly 100 is 5.51 mm, the maximum field angle of the lens assembly 100 in the diagonal direction is 140, the back focal length is 1.4 mm, and the depth of field is 75 mm. That is, the lens assembly 100 has the advantages of large field angle, small size, large back focal length and depth of field, which can effectively avoid the problem of limited field of view and is conducive to improving the detection accuracy of the endoscope.

[0071] In summary, the lens assembly provided by the embodiment of the present application has at least the following advantages:

[0072] Since seven groups of lenses are provided, and the first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has positive optical power or negative optical power, the fifth lens has positive optical power, the sixth lens has negative optical power, and the seventh lens has zero optical power. After testing, the total optical length of the lens assembly of the embodiment of the present application is ≤5.51mm, the maximum field of view FOV in the diagonal direction can reach 140°, the back focal length can reach 1.4mm, and the depth of field can reach 75mm. That is, the embodiment of the present application, by providing seven groups of lenses that cooperate with each other, can make the lens assembly have the advantages of small size, large field of view angle, back focal length, and large depth of field, thereby effectively avoiding the problem of limited field of view, which is conducive to improving the detection accuracy of industrial endoscopes.

[0073] Reference Figures 2 to 4 , shows a schematic diagram of the structure of an endoscope probe provided in an embodiment of the present application, such as Figures 2 to 4 As shown, an embodiment of the present application further provides an endoscopic probe, the endoscopic probe having a first direction X and a second direction Y perpendicular to each other, the endoscopic probe comprising: two imaging chips 200 and two lens assemblies 100 of any one of the above items; the two lens assemblies 100 are arranged in parallel along the first direction X; an imaging chip 200 is arranged on the light emitting side of a lens assembly 100, and the two imaging chips 200 are arranged back to back along the second direction Y, and the imaging chip 200 is used to receive the light introduced by the lens assembly 100 and form an image.

[0074] In the embodiment of the present application, by setting a lens assembly 100 composed of seven groups of lenses, the total optical length of the lens assembly 100 is ≤5.51mm, the maximum field of view FOV in the diagonal direction can reach 140°, the back focal length can reach 1.4mm, and the depth of field can reach 75mm. That is, by setting seven groups of lenses that cooperate with each other, the embodiment of the present application can make the lens assembly 100 have the advantages of small size, large field of view, back focal length, and large depth of field, thereby effectively avoiding the problem of limited field of view, which is conducive to improving the detection accuracy of industrial endoscopes. In addition, by arranging the two imaging chips 200 back to back along the second direction Y, that is, the radial direction of the endoscope probe. In this way, without reducing the size of the imaging chip 200, the radial size of the endoscope probe can be reduced, thereby achieving the miniaturization and high resolution of the endoscope probe at the same time, which is conducive to improving the detection accuracy of the endoscope.

[0075] It should be noted that in the embodiment of the present application, the structure of the lens assembly 100 is the same as the structure of the lens assembly 100 of any of the above-mentioned embodiments, and its beneficial effects are also similar, which will not be described in detail here. In practical applications, the shape of the endoscopic probe is usually cylindrical. The first direction X of the embodiment of the present application refers to the axial direction of the endoscopic probe, and the second direction Y refers to the radial direction of the endoscopic probe. In addition, the back-to-back arrangement of the two imaging chips 200 in the embodiment of the present application means that the light incident sides of the two imaging chips 200 are facing away from each other. In addition, the endoscopic probe of the embodiment of the present application can be used not only in the industrial field, but also in medical or other fields that require the use of endoscopic detection technology, which is not limited here.

[0076] In some optional embodiments of the present application, the endoscope probe further includes an illumination fiber 300, which is extended along the first direction X and avoids the lens assembly 100, and the light-emitting side of the illumination fiber 300 is located on the same side as the light-incoming side of the lens assembly 100. In this way, illumination can be achieved, which is conducive to improving the clarity and accuracy of imaging.

[0077] In a specific application, the endoscope probe further includes two circuit boards 400, which are arranged back-to-back along the second direction Y and between the two imaging chips 200; one imaging chip 200 is arranged on one circuit board 400. The circuit board 400 is used to connect with an external circuit. In this way, the transmission of electrical signals can be achieved by connecting the circuit board 400 with the external circuit.

[0078] It should be noted that the circuit board 400 can be a printed circuit board 400 (PCB) or a flexible circuit board 400 (FPC), which is not limited here and can be selected by those skilled in the art according to actual needs. It is understandable that when a printed circuit board 400 is used, since the printed circuit board 400 has a certain rigidity, the imaging chip 200 can be well supported. When a flexible circuit board 400 is used, since the printed circuit board 400 has a small rigidity and is easy to bend, an additional bracket is usually required to support the flexible circuit board 400 and the imaging chip 200. The circuit board 400 of the embodiment of the present application is preferably a printed circuit board 400, and the imaging chip 200 can be attached to the surface of the printed circuit board 400 by wave soldering, reflow soldering and other processes.

[0079] In a specific application, two illumination optical fibers 300 are provided, and the two illumination optical fibers 300 and the two lens assemblies 100 are alternately arranged along the circumference of the lens holder 500. That is, the two illumination optical fibers 300 and the two lens assemblies 100 are staggered along the circumference of the lens holder 500. In this way, on the one hand, the space of the lens holder 500 can be reasonably utilized, which is conducive to reducing the radial size of the endoscope probe and realizing the miniaturization of the endoscope probe. On the other hand, illumination can be achieved, which is conducive to improving the clarity and accuracy of imaging.

[0080] It should be noted that the illumination optical fiber 300 and the lens assembly 100 may be alternately arranged along the circumference of the lens holder 500 at uniform intervals, or may be alternately arranged along the circumference of the lens holder 500 at non-uniform intervals, which is not limited here, and those skilled in the art may adjust according to actual needs. In one embodiment, as Figure 3 As shown, two illumination optical fibers 300 and two lens assemblies 100 are alternately arranged at uniform intervals along the circumference of the lens holder 500, and the two lens assemblies 100 and the two illumination optical fibers 300 are distributed in a cross shape. Specifically, the lens holder 500 is provided with two first mounting holes extending along the first direction X and two second mounting holes extending along the second direction Y, wherein at least parts of the two lens assemblies 100, that is, at least parts of the lenses, are embedded in the first mounting holes, and at least parts of the two illumination optical fibers 300 are embedded in the second mounting holes, so that the illumination optical fibers 300 and the lens assemblies 100 are reliably connected to the lens holder 500.

[0081] In practical applications, the illumination optical fiber 300 includes an optical fiber and a protective sleeve covering the optical fiber. The optical fiber is used to transmit optical signals, and the protective sleeve protects the optical fiber to prevent the optical fiber from being disturbed or damaged by external forces, which is beneficial to increase the service life of the optical fiber. In addition, the illumination optical fiber 300 includes two ends that are arranged away from each other, one end is the light input side, and the other end is the light output side, wherein the light output side is coupled with a high-power LED (light emitting diode) to provide a light source.

[0082] In some optional embodiments of the present application, a fixing member 501 is provided at one end of the lens holder 500 close to the imaging chip 200, and the fixing member 501 is fixedly connected to at least part of the lens assembly 100 and the imaging chip 200. In this way, through the fixed connection between the fixing member 501 and at least part of the lens assembly 100, that is, the fixing member 501 and the prism, a reliable connection between the lens assembly 100 and the lens holder 500 can be achieved. Through the fixed connection between the fixing member 501 and at least part of the imaging chip 200, a reliable connection between the imaging chip 200 and the lens holder 500 can be achieved.

[0083] It should be noted that, in the embodiment of the present application, the fixing connection method of the fixing member 501 and the prism, and the fixing member 501 and the imaging chip 200 includes but is not limited to glue bonding. In practical applications, four fixing members 501 are arranged at one end of the lens holder 500 close to the imaging chip 200, and the four fixing members 501 are arranged at intervals along the circumference of the lens holder 500, and each fixing member 501 extends along the first direction X toward the prism and the imaging chip 200, and at least part of the surface of the fixing member 501 is bonded to at least part of the prism and the imaging chip 200, respectively.

[0084] In some optional embodiments of the present application, the endoscope probe further includes a temperature sensor 600, which is fixedly connected to the lens holder 500 and is used to detect the temperature of the external environment. In this way, by providing the temperature sensor 600, the temperature of the external environment can be monitored in real time. When the temperature of the external environment exceeds the operating temperature range of the endoscope, the inspection personnel can be reminded to stop using the endoscope in time, thereby effectively protecting the endoscope probe and facilitating the improvement of the service life of the endoscope probe.

[0085] An embodiment of the present application also provides an endoscope, which includes the above-mentioned endoscopic probe.

[0086] It should be noted that in the embodiment of the present application, the structure of the endoscopic probe is the same as the structure of the endoscopic probe described in any of the above embodiments, and its beneficial effects are also similar, which will not be elaborated here.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0088] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A lens assembly, characterized in that: The lens assembly comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence from the object side to the image side along the optical axis; The first lens has negative optical power; The second lens has negative optical power; The third lens has positive optical power; The fourth lens has positive or negative optical power; The fifth lens has positive optical power; The sixth lens has negative optical power; The seventh lens has zero optical power.

2. The lens assembly according to claim 1, characterized in that: The object side surface of the first lens is a plane or a convex surface, and the image side surface of the first lens is a concave surface; And / or, the object-side surface of the third lens is a plane or a convex surface, and the image-side surface of the third lens is a convex surface.

3. The lens assembly according to claim 1, characterized in that: The object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; Alternatively, the object-side surface of the second lens is a flat surface, and the image-side surface of the second lens is a concave surface.

4. The lens assembly according to claim 1, characterized in that: The object side surface and the image side surface of the fourth lens are both convex surfaces; Alternatively, the object-side surface of the fourth lens is a convex surface, and the image-side surface of the fourth lens is a concave surface.

5. The lens assembly according to claim 1, characterized in that: The fifth lens and the sixth lens are cemented lenses; Among them, the object side surface and the image side surface of the fifth lens are both convex surfaces, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface.

6. The lens assembly according to claim 1, characterized in that: The lens assembly further includes an eighth lens and a ninth lens sequentially arranged along the optical axis direction; The eighth lens and the ninth lens are disposed between the fourth lens and the fifth lens, and the eighth lens is disposed close to the fourth lens; The eighth lens has negative refractive power, and the ninth lens has positive refractive power.

7. The lens assembly according to claim 6, characterized in that: The eighth lens and the ninth lens are cemented lenses; Among them, the object side surface and the image side surface of the eighth lens are both concave surfaces, and the object side surface and the image side surface of the ninth lens are both convex surfaces.

8. An endoscope probe, characterized in that: The endoscopic probe has a first direction and a second direction perpendicular to each other, and the endoscopic probe comprises: two imaging chips and two lens assemblies according to any one of claims 1 to 7; The two lens assemblies are arranged in parallel along the first direction; One of the imaging chips is arranged on the light-emitting side of one of the lens assemblies, and two of the imaging chips are arranged back to back along the second direction. The imaging chip is used to receive the light introduced by the lens assembly and form an image.

9. The endoscopic probe according to claim 8, characterized in that: The endoscope probe further includes an illumination optical fiber, which is extended along the first direction and avoids the lens assembly. The light-emitting side of the illumination optical fiber and the light-incoming side of the lens assembly are located on the same side.

10. An endoscope, characterized in that: The endoscope includes the endoscopic probe according to claim 8 or 9.

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