Endoscope imaging objective lens mechanism, zoom lens and endoscope

Abstract

The present invention provides an imaging objective lens mechanism for an endoscope, a variable-focus lens, an endoscope, and an endoscope system. The zoom mechanism includes a lens holder, and a first fixed lens group, a second fixed lens group, and a movable lens group installed in the lens holder; the movable lens group is disposed between the first fixed lens group and the second fixed lens group; a movable frame is further disposed in the lens holder, a gap being formed between the movable frame and the inner wall of the lens holder, the movable lens group being mounted in the movable frame, a first magnet being embedded in the outer periphery of the movable frame, the first magnet and the second magnet being arranged in a ring-shaped arrangement, a second magnet being correspondingly embedded in the inner wall of the lens holder, the first magnet and the second magnet being capable of mutual attraction and repulsion to drive the movable frame to reciprocate along the extension direction of the optical axis; and an elastic reset mechanism is further disposed in the lens holder. The present invention can effectively solve the stability problem during optical zooming, improve the positioning accuracy of the movable lens group, and thereby effectively achieve zooming.

Description

[0001] This divisional application is a divisional application based on the Chinese patent application with application number 202211701251.3, application date December 29, 2022, and invention name “Imaging objective mechanism of endoscope, variable focus lens and endoscope”. Technical Field

[0002] The present invention relates to the technical field of medical instruments, and in particular to an imaging objective lens mechanism of an endoscope, a variable focus lens, an endoscope, and an endoscope system. Background Art

[0003] Electronic endoscopes are often used in medical diagnosis, minimally invasive surgery, etc. To improve diagnostic efficiency, a large field of view and wide angle are usually required to observe lesions during clinical use. Once a suspicious lesion area is found, high-resolution microscopic observation is required to improve diagnostic accuracy. This requires that the imaging objective lens of the endoscope have the function of adjustable optical focal length.

[0004] Currently, conventional electronic endoscopes with optical zoom functions have a very small space occupied by the lens due to the limitation of the entire insertion space, which makes the design and implementation of the zoom mechanism very difficult. Some existing solutions use a motor installed in the operating part to rotate and drive a synchronous steel wire at the head end to convert rotational motion into linear motion. Some use push-pull steel wires to drive the moving lens group at the head end to achieve zoom. However, corresponding steel wire ropes are required in the rotation or push-pull process, which means that when the bending part of the endoscope bends, the steel wire rope that drives the zoom will have a certain displacement effect, making it difficult to ensure the positioning accuracy of the moving lens group.

[0005] It should be noted that the information disclosed in the background technology section of the invention is only intended to deepen the understanding of the general background technology of the invention, and should not be regarded as an admission or any form of implication that the information constitutes prior art already known to those skilled in the art. Summary of the Invention

[0006] The object of the present invention is to provide an imaging objective lens mechanism of an endoscope, a zoom lens, an endoscope and an endoscope system, which can solve the stability problem of the imaging objective lens during optical zooming and ensure the positioning accuracy of the movable lens group.

[0007] To achieve the above-mentioned objectives, the present invention provides an imaging objective lens mechanism of an endoscope, comprising a lens mount and a first fixed lens group, a second fixed lens group and a movable lens group installed in the lens mount; the movable lens group is arranged between the first fixed lens group and the second fixed lens group, and the optical axes of the movable lens group, the first fixed lens group and the second fixed lens group are arranged collinearly; a movable frame is also provided in the lens mount, and a gap is provided between the outer periphery of the movable frame and the inner wall of the lens mount, the movable lens group is installed in the movable frame, the outer periphery of the movable frame is embedded with a first magnet, and the inner wall of the lens mount is correspondingly embedded with a second magnet, the first magnet and the second magnet are arranged in an annular manner, at least one of the first magnet and the second magnet is an energized coil, the first magnet and the second magnet can attract and repel each other to drive the movable frame to reciprocate along the extension direction of the optical axis; an elastic reset mechanism is also provided in the lens mount, and the elastic reset mechanism is arranged between the lens mount and the movable frame.

[0008] Optionally, a coil is embedded in the outer periphery of the movable frame, and the coil can form a first magnet when energized. The second magnet is a permanent magnet, and there are multiple second magnets, which are evenly arranged around the optical axis.

[0009] Optionally, an annular groove matching the coil is provided on the outer periphery of the movable frame, and the coil is embedded in the annular groove.

[0010] Optionally, a plurality of mounting grooves corresponding to the second magnets are provided on the inner wall of the lens holder, and the second magnets are embedded in the mounting grooves.

[0011] Optionally, the elastic reset mechanism includes a first elastic member and a second elastic member, the first elastic member is arranged between the lens mount and the distal end of the movable frame, and the second elastic member is arranged between the lens mount and the proximal end of the movable frame.

[0012] Optionally, the first elastic member includes a plurality of first springs evenly arranged around the optical axis, the distal end of the first spring is connected to the lens mount, and the proximal end of the first spring is connected to the distal end of the movable frame; and / or the second elastic member includes a plurality of second springs evenly arranged around the optical axis, the proximal end of the second spring is connected to the lens mount, and the distal end of the second spring is connected to the proximal end of the movable frame.

[0013] Optionally, the first elastic member includes a plurality of first spring pieces evenly arranged around the optical axis, the first spring piece is provided with a first positioning hole, the distal end of the lens mount is correspondingly provided with a first positioning column cooperating with the first positioning hole, the first spring piece is also provided with a second positioning hole, the distal end of the movable frame is correspondingly provided with a second positioning column cooperating with the second positioning hole; and / or the second elastic member includes a plurality of second spring pieces evenly arranged around the optical axis, the second spring piece is provided with a third positioning hole, the proximal end of the movable frame is correspondingly provided with a third positioning column cooperating with the third positioning hole, the second spring piece is also provided with a fourth positioning hole, and the proximal end of the lens mount is correspondingly provided with a fourth positioning column cooperating with the fourth positioning hole.

[0014] Optionally, the lens mount includes a first shell and a second shell connected along the direction from the distal end to the proximal end, the first fixed mirror group is arranged in the distal end of the first shell, the movable frame is arranged in the proximal end of the first shell, the second magnet is arranged on the inner wall of the first shell, the second fixed mirror group is arranged in the second shell, the first elastic member is connected to the first shell, and the second elastic member is connected to the second shell.

[0015] Optionally, a first limiting portion is provided in the first shell, and a first protrusion protruding toward the first limiting portion is provided at the distal end of the movable frame.

[0016] Optionally, a second limiting portion is provided in the second shell, and a second protruding portion protruding toward the second limiting portion is provided at the proximal end of the movable frame.

[0017] Optionally, a lens barrel for mounting the second fixed lens group is further provided in the second shell, a step portion is provided in the second shell, and an overlapping portion cooperating with the step portion is provided on the outer periphery of the lens barrel.

[0018] Optionally, a mounting position is provided at the proximal end of the first shell, and a connecting portion matching the mounting position is correspondingly provided at the distal end of the second shell, and the distal end of the second shell extends circumferentially along its outer periphery to form the connecting portion.

[0019] Optionally, a guide column arranged parallel to the extension direction of the optical axis is further provided in the lens mount, and a guide hole matching the guide column is correspondingly provided on the movable frame.

[0020] To achieve the above-mentioned purpose, the present invention also provides a variable focus lens, including the imaging objective lens mechanism of the endoscope mentioned above, a mounting seat and an image sensor arranged in the mounting seat, the distal end of the mounting seat is mounted on the proximal end of the lens seat, and the image sensor is arranged in the proximal end of the mounting seat.

[0021] To achieve the above objectives, the present invention also provides an endoscope, comprising the above variable focus lens.

[0022] To achieve the above objectives, the present invention also provides an endoscope system, comprising the above endoscope.

[0023] Compared with the prior art, the imaging objective lens mechanism, variable focus lens, endoscope and endoscope system provided by the present invention have the following advantages: the imaging objective lens mechanism of the endoscope provided by the present invention includes a lens holder and a first fixed lens group, a second fixed lens group and a movable lens group installed in the lens holder; the movable lens group is arranged between the first fixed lens group and the second fixed lens group, and the optical axes of the movable lens group, the first fixed lens group and the second fixed lens group are arranged collinearly; a movable frame is also provided in the lens holder, and a gap is provided between the outer periphery of the movable frame and the inner wall of the lens holder, the movable lens group is installed in the movable frame, the outer periphery of the movable frame is embedded with a first magnet, and the inner wall of the lens holder is correspondingly embedded with a second magnet, the first magnet and the second magnet are arranged in a ring, the first magnet and the second magnet can attract and repel each other to drive the movable frame to reciprocate along the extension direction of the optical axis; an elastic reset mechanism is also provided in the lens holder, and the elastic reset mechanism is arranged between the lens holder and the movable frame. Thus, compared to the prior art, the imaging objective lens mechanism of the endoscope provided by the present invention utilizes magnetic force to drive the movable lens group to reciprocate along the extension direction of the optical axis, which can ensure that the displacement of the movable lens group is not affected by the bending angle of the curved portion of the endoscope, thereby effectively solving the stability problem during optical zooming, improving the accuracy of the positioning of the movable lens group, and thus effectively achieving zooming. In addition, the present invention provides an elastic reset mechanism between the lens mount and the movable frame, which not only ensures the accurate initial positioning of the movable frame, but also plays a role in magnetic force compensation. When power is on, the movable frame is driven by the magnetic force to move, and the elastic reset mechanism can act as a buffer during the movement process, thereby ensuring that the imaging objective lens mechanism of the endoscope provided by the present invention can smoothly zoom. When power is off, the movable frame can be restored to its initial position under the action of the elastic reset mechanism. In addition, because the first magnet is embedded in the outer periphery of the movable frame and the second magnet is embedded in the inner wall of the lens holder, and the first magnet and the second magnet are arranged in an annular manner, internal space can be saved. By effectively utilizing the limited space inside the lens holder, the structural size of the endoscope lens end is not increased. At the same time, the movable lens group, the movable frame, and the first magnet are integrated into one body, effectively reducing the number of internal parts, simplifying assembly, and improving reliability. In addition, because the movement and positioning accuracy of the movable module (including the movable lens group, the movable frame, and the first magnet) can be guaranteed by the elastic reset mechanism, the precision requirements for the first magnet, the second magnet, and the corresponding mounting structure are reduced. Furthermore, because there is a gap between the outer periphery of the movable frame and the inner wall of the lens holder, the movable module (including the movable lens group, the movable frame, and the first magnet) will not wear against the second magnet and the inner wall of the lens holder during movement, thereby effectively preventing the occurrence of fine powder generated by wear and tear adhering to the lens and affecting the quality of the captured image.

[0024] Since the variable focus lens, endoscope and endoscope system provided by the present invention and the imaging objective lens mechanism of the endoscope provided by the present invention belong to the same inventive concept, the variable focus lens, endoscope and endoscope system provided by the present invention and the imaging objective lens mechanism of the endoscope provided by the present invention have all the advantages of the imaging objective lens mechanism of the endoscope provided by the present invention. Therefore, the beneficial effects of the variable focus lens, endoscope and endoscope system provided by the present invention will not be described one by one here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the movable lens group in the imaging objective lens mechanism of the endoscope provided by the first embodiment of the present invention at the initial position.

[0026] Figure 2 This is a schematic diagram of the installation structure of the first magnet and the second magnet provided in one embodiment of the present invention.

[0027] Figure 3 This is a structural schematic diagram of the imaging objective lens mechanism of the endoscope provided by the first embodiment of the present invention in an image magnification state.

[0028] Figure 4 This is a schematic structural diagram of the imaging objective lens mechanism of the endoscope provided in the second embodiment of the present invention in a normal state (the image is in a non-magnified state).

[0029] Figure 5 This is a schematic structural diagram of the movable lens group in the imaging objective lens mechanism of the endoscope provided by the third embodiment of the present invention at the initial position.

[0030] Figure 6 A schematic structural diagram of the cooperation between the guide post and the guide hole in the imaging objective lens mechanism of the endoscope provided by the third embodiment of the present invention.

[0031] Figure 7 This is a schematic structural diagram of a first elastic member provided in another embodiment of the present invention.

[0032] Figure 8 A schematic diagram of the partial structure of an endoscope provided in one embodiment of the present invention.

[0033] The reference numerals are as follows: imaging objective lens mechanism of endoscope 100; lens holder 110; first housing 111; first cavity 1111; second cavity 1112; first position-limiting portion 1114; mounting position 1115; second housing 112; fifth cavity 1121; step portion 1122; connecting portion 1123; second position-limiting portion 1124; guide post 113; first positioning post 114; first fixed lens group 121; second fixed lens group 122; movable lens group 123; movable frame 130; first protruding portion 1 ... first position-limiting portion 1124; second fixed lens group 122; movable lens group 123; movable frame 130; first protruding portion 1121; first position-limiting portion 1124; second fixed lens group 122; movable lens group 123; movable frame 130; first protruding portion 112 131; second protrusion-132; guide hole-133; second positioning column-134; coil-141; second magnet-142; first spring-151; first spring piece-152; first positioning hole-1521; second positioning hole-1522; second spring-161; cable-170; lens barrel-180; first barrel-181; second barrel-182; overlapping portion-183; mounting base-200; image sensor-300; zoom lens-10; head end cover-20; head end base-30; bending portion-40; instrument channel-50. DETAILED DESCRIPTION

[0034] The following, in conjunction with the accompanying drawings and specific embodiments, further details the endoscope imaging objective mechanism, variable focus lens, endoscope, and endoscope system proposed in the present invention. The following description will further clarify the advantages and features of the present invention. It should be noted that the drawings are simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the purpose of the embodiments of the present invention. To make the purposes, features, and advantages of the present invention more readily apparent, please refer to the accompanying drawings. It should be noted that the structures, proportions, and sizes illustrated in the drawings of this specification are intended solely to facilitate understanding and reading by those skilled in the art, and are not intended to limit the implementation of the present invention. Any structural modifications, changes in proportions, or adjustments in size, provided they achieve the same or similar effects and objectives as the present invention, are within the scope of the technical content disclosed herein. The specific design features of the present invention disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the specific application and environment in which they are intended. Also, in the embodiments described below, sometimes the same reference numerals are used in common between different drawings to represent the same parts or parts having the same functions, and their repeated descriptions are omitted. In this specification, similar reference numerals and letters are used to represent similar items, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings. In addition, if the method herein includes a series of steps, the order of these steps presented herein is not necessarily the only order in which these steps can be performed, and some steps may be omitted and / or some other steps not described herein may be added to the method.

[0035] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element. The singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in a sense including "and / or", the term "several" is generally used in a sense including "at least one", and the term "at least two" is generally used in a sense including "two or more". In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features.

[0036] 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", "axial", "radial", "circumferential" and the like to 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] The core concept of the present invention is to provide an endoscope imaging objective lens mechanism, a variable-focus lens, an endoscope, and an endoscope system that can solve the stability problem during the optical zoom process of the imaging objective lens and ensure the positioning accuracy of the movable lens group. It should be noted that, as those skilled in the art will understand, the "proximal end" referred to in the present invention refers to the end closest to the operator, and the "distal end" refers to the end away from the operator, that is, the end closest to the lesion. In addition, it should be noted that, as those skilled in the art will understand, the "plurality" referred to in the present invention includes the situation of "two."

[0040] In order to realize the above idea, the present invention provides an imaging objective lens mechanism of an endoscope, please refer to Figure 1 , which schematically shows the structure of the movable lens group in the imaging objective lens mechanism of the endoscope provided by the first embodiment of the present invention at the initial position. Figure 1 As shown, the imaging objective lens mechanism 100 of the endoscope provided by the present invention includes a lens holder 110 and a first fixed lens group 121, a second fixed lens group 122 and a movable lens group 123 installed in the lens holder 110; the movable lens group 123 is arranged between the first fixed lens group 121 and the second fixed lens group 122, and the optical axes of the movable lens group 123, the first fixed lens group 121 and the second fixed lens group 122 are arranged collinearly; a movable frame 130 is further provided in the lens holder 110, and the outer periphery of the movable frame 130 is aligned with the inner wall of the lens holder 110. There is a gap between them, the movable mirror group 123 is installed in the movable frame 130, the outer periphery of the movable frame 130 is embedded with a first magnet, and the inner wall of the lens holder 110 is correspondingly embedded with a second magnet 142. The first magnet and the second magnet 142 are arranged in an annular manner, and the first magnet and the second magnet 142 can attract and repel each other to drive the movable frame 130 to reciprocate along the extension direction of the optical axis; an elastic reset mechanism (not shown in the figure) is also provided in the lens holder 110, and the elastic reset mechanism is arranged between the lens holder 110 and the movable frame 130.

[0041] Thus, compared to the prior art, the imaging objective lens mechanism 100 of the endoscope provided by the present invention utilizes magnetic force to drive the movable lens group 123 to reciprocate along the extension direction of the optical axis. This allows the displacement of the movable lens group 123 to be unaffected by the bending angle of the curved portion 40 of the endoscope, thereby effectively solving the stability problem during optical zooming, improving the accuracy of the positioning of the movable lens group 123, and thus effectively achieving zooming. In addition, by providing an elastic reset mechanism within the lens holder 110, the present invention not only ensures the accurate initial positioning of the movable frame 130, but also provides magnetic force compensation. When power is applied, the movable frame 130 is driven by electromagnetic force, and the elastic reset mechanism acts as a buffer during the movement process, thereby ensuring smooth zooming of the imaging objective lens mechanism 100 of the endoscope provided by the present invention. When power is removed, the movable frame 130 can be restored to its initial position under the action of the elastic reset mechanism. In addition, since the first magnet is embedded in the outer periphery of the movable frame 130, the second magnet 142 is embedded in the inner wall of the lens holder 110, and the first magnet and the second magnet 142 are arranged in a ring, internal space can be saved. By effectively utilizing the limited space inside the lens holder 110, the size of the endoscope head end structure will not be increased. At the same time, the movable lens group 123, the movable frame 130, and the first magnet are integrated into one body, effectively reducing the number of internal parts, simplifying assembly, and increasing reliability. In addition, since the movement and positioning accuracy of the movable module (including the movable lens group 123, the movable frame 130, and the first magnet) can be guaranteed by the elastic reset mechanism, the accuracy requirements for the first magnet, the second magnet 142, and the corresponding mounting structural parts are reduced. Furthermore, since there is a gap between the outer periphery of the movable frame 130 and the inner wall of the lens holder 110, the movable module (including the movable lens group 123, the movable frame 130 and the first magnet) will not wear against the second magnet 142 and the inner wall of the lens holder 110 during the movement, thereby effectively preventing the fine powder generated by wear from adhering to the lens and affecting the quality of the captured image.

[0042] It should be noted that, as those skilled in the art will appreciate, the axis of the movable frame 130 is collinear with the axis of the lens holder 110 and with the optical axis. Furthermore, it should be noted that, as those skilled in the art will appreciate, the first fixed lens group 121, the movable lens group 123, and the second fixed lens group 122 each include at least one lens. The present invention does not impose any limitation on the number of lenses included in the first fixed lens group 121, the movable lens group 123, and the second fixed lens group 122, and the number of lenses may be set based on actual circumstances.

[0043] Furthermore, if Figure 1As shown, the elastic reset mechanism includes a first elastic member and a second elastic member. The first elastic member is disposed between the lens mount 110 and the distal end of the movable frame 130, and the second elastic member is disposed between the lens mount 110 and the proximal end of the movable frame 130. Thus, this arrangement allows for more precise initial positioning of the movable frame 130. As will be appreciated by those skilled in the art, in other embodiments, the elastic reset structure may include only one of the first elastic member and the second elastic member. By providing only the first elastic member or the second elastic member, a buffering effect can still be achieved during the movement of the movable frame 130, ensuring that the movable frame 130 can return to its initial position after a power outage.

[0044] Please continue to refer to Figure 2 , which schematically shows the installation structure diagram of the first magnet and the second magnet 142 provided in one embodiment of the present invention. Figure 2 As shown, a coil 141 is embedded in the outer periphery of the movable frame 130. When energized, the coil 141 forms a first magnet. The second magnet 142 is a permanent magnet, and there are multiple second magnets 142, which are evenly arranged around the optical axis, that is, multiple second magnets 142 are arranged in a ring around the coil 141. Therefore, by embedding the coil 141 in the outer periphery of the movable frame 130 to form the first magnet when energized, the internal space of the lens holder 110 can be further fully utilized, further ensuring that the structural size of the endoscope head end is not increased. In addition, by embedding multiple second magnets 142 evenly arranged around the optical axis on the inner wall of the lens holder 110, not only can the internal space of the lens holder 110 be further fully utilized, but the magnetic force can also be evenly distributed, thereby ensuring that the movable frame 130 can reciprocate along the extension direction of the optical axis. In other words, the optical axes of the movable lens group 123, the first fixed lens group 121, and the second fixed lens group 122 are always collinear. It should be noted that, as those skilled in the art will appreciate, in some other embodiments, the first magnet may be set as a permanent magnet, and the second magnet 142 may be set as an energized coil. Of course, both the first magnet and the second magnet 142 may be set as energized coils. Figure 2The following description uses the example of four evenly distributed second magnets 142 (permanent magnets) within the lens holder 110. However, as those skilled in the art will appreciate, in other embodiments, the lens holder 110 may also include three evenly distributed second magnets 142, five evenly distributed second magnets 142, or even more evenly distributed second magnets 142. The specific arrangement may be based on practical circumstances, and the present invention is not limited thereto. Furthermore, as those skilled in the art will appreciate, the present invention does not limit the specific placement of the second magnets 142 on the inner wall of the lens holder 110. For example, in other embodiments, the four second magnets 142 may be evenly distributed at the four corners of the inner wall of the lens holder 110.

[0045] Furthermore, if Figure 1 As shown, the coil 141 is connected to a cable 170, which is used to connect to an external power source. Thus, the current provided by the power source can be input to the coil 141 through the coil 141, so that the coil 141 can generate electromagnetic force.

[0046] Please continue to refer to Figure 1 and Figure 2 ,like Figure 1 and Figure 2 As shown, in an exemplary embodiment, the outer periphery of the movable frame 130 is provided with an annular groove (not shown) that cooperates with the coil 141, and the coil 141 is embedded in the annular groove. Since the coil 141 is embedded in the annular groove, the internal space of the lens holder 110 can be further fully utilized, further ensuring that the structural size of the endoscope head end is not increased.

[0047] Please continue to refer to Figure 1 ,like Figure 1 As shown, the inner wall of the lens holder 110 is provided with a plurality of mounting grooves (not shown) corresponding to the second magnets 142, and the second magnets 142 are embedded in the mounting grooves. Since the second magnets 142 are embedded in the mounting grooves, the internal space of the lens holder 110 can be further fully utilized, further ensuring that the structural size of the endoscope head end is not increased.

[0048] Please continue to refer to Figure 1 ,like Figure 1As shown, in this embodiment, the first elastic member includes a plurality of first springs 151 uniformly arranged around the optical axis, the distal ends of the first springs 151 are connected to the distal end of the lens holder 110, and the proximal ends of the first springs 151 are connected to the distal end of the movable frame 130; and / or the second elastic member includes a plurality of second springs 161 uniformly arranged around the optical axis, the proximal ends of the second springs 161 are connected to the proximal end of the lens holder 110, and the distal ends of the second springs 161 are connected to the proximal end of the movable frame 130. Thus, by configuring the first elastic member to include a plurality of first springs 151 uniformly arranged around the optical axis, and / or configuring the second elastic member to include a plurality of second springs 161 uniformly arranged around the optical axis, not only can the initial position of the movable frame 130 be more accurately positioned, but also better magnetic force compensation can be achieved, further ensuring that the imaging objective lens mechanism 100 of the endoscope provided by the present invention is able to achieve stable zooming. It should be noted that, as those skilled in the art will appreciate, the present invention does not impose any restrictions on the number of first springs 151 included in the first elastic member and the number of second springs 161 included in the second elastic member. The number of first springs 151 can be two, three, four or more. Similarly, the number of second springs 161 can be two, three, four or more.

[0049] Please continue to refer to Figure 1 ,like Figure 1 As shown, in an exemplary embodiment, the lens holder 110 includes a first housing 111 and a second housing 112 connected in a distal-to-proximal direction, a first fixed lens group 121 is disposed in the distal end of the first housing 111, a movable frame 130 is disposed in the proximal end of the first housing 111, a second magnet 142 is disposed on the inner wall of the first housing 111, a second fixed lens group 122 is disposed in the second housing 112, a distal end of the first elastic member (first spring 151) is connected to the first housing 111, and a proximal end of the second elastic member (second spring 161) is connected to the second housing 112. Thus, by configuring the lens holder 110 to include a structure including the connected first housing 111 and the second housing 112, and disposing the first fixed lens group 121 and the movable frame 130 in the first housing 111, and disposing the second fixed lens group 122 in the second housing 112, the assembly of the imaging objective lens mechanism 100 of the endoscope provided by the present invention can be facilitated.

[0050] Please continue to refer to Figure 1 and Figure 3 ,in Figure 3 The following schematically shows the structure of the imaging objective lens mechanism 100 of the endoscope provided by the first embodiment of the present invention in the image magnification state. Figure 1 and Figure 3 As shown, a first limiting portion 1114 is provided in the first housing 111, and a first protruding portion 131 protruding toward the first limiting portion 1114 is provided at the distal end of the movable frame 130. 。Therefore, the first limiting portion 1114 and the first protruding portion 131 that cooperate with each other can play a limiting role, preventing the movable lens group 123 from colliding due to operational errors, and further improving the stability of the imaging objective lens mechanism 100 of the endoscope provided by the present invention during the zoom process.

[0051] Furthermore, if Figure 1 and Figure 3 As shown, the first housing 111 includes a first cavity 1111, a second cavity 1112, and a third cavity (not shown) connected in sequence along the proximal-to-distal direction. The movable frame 130 is disposed in the first cavity 1111, and the first fixed mirror assembly 121 is disposed in the third cavity. The inner diameter of the second cavity 1112 is smaller than the inner diameter of the first cavity 1111, so as to form a first limiting portion 1114 between the second cavity 1112 and the first cavity 1111. The inner diameter of the second cavity 1112 is smaller than the inner diameter of the third cavity. The first elastic member is connected to the first limiting portion 1114. Therefore, this arrangement not only facilitates the fixing and installation of the first elastic member, but also makes it easier to dispose the first limiting portion 1114.

[0052] Please continue to refer to Figure 1 and Figure 3 ,like Figure 1 and Figure 3 As shown, in an exemplary embodiment, a mounting position 1115 is provided at the proximal end of the first housing 111, and a connecting portion 1123 that cooperates with the mounting position 1115 is correspondingly provided at the distal end of the second housing 112. The distal end of the second housing 112 is circumferentially extended along its outer periphery to form the connecting portion 1123. Thus, the mutually cooperating mounting position 1115 and connecting portion 1123 facilitate the connection between the first housing 111 and the second housing 112. Furthermore, because the connecting portion 1123 is formed by the distal end of the second housing 112 extending circumferentially along its outer periphery, the overall structure of the imaging objective lens mechanism 100 of the endoscope provided by the present invention can be further simplified.

[0053] Please continue to refer to Figure 1 and Figure 3 ,like Figure 1 and Figure 3 As shown, in an exemplary embodiment, a lens barrel 180 for mounting the second fixed lens group 122 is further provided in the second housing 112. Thus, by providing the lens barrel 180 for mounting the second fixed lens group 122 in the second housing 112, the installation and fixation of each lens in the second fixed lens group 122 can be more convenient.

[0054] Furthermore, if Figure 1 and Figure 3As shown, a step portion 1122 is provided in the second housing 112, and a lap portion 183 is provided on the outer periphery of the lens barrel 180 to match the step portion 1122. Thus, this arrangement can make it easier to fix the lens barrel 180 in the second housing 112.

[0055] Furthermore, if Figure 1 and Figure 3 As shown, the second housing 112 includes a fourth cavity (not shown) and a fifth cavity 1121 connected along the direction from the distal end to the proximal end. The inner diameter of the fourth cavity is smaller than the inner diameter of the fifth cavity 1121, so as to form a step portion 1122 between the fourth cavity and the fifth cavity 1121. The lens barrel 180 includes a first barrel 181 and a second barrel 182 connected along the direction from the distal end to the proximal end. The outer periphery of the second barrel 182 is protruded outward relative to the outer periphery of the first barrel 181 to form a lap joint 183. Thus, by configuring the inner cavity of the second housing 112 to include a fourth cavity with a smaller inner diameter and a fifth cavity 1121 with a larger inner diameter, it is possible to more easily install and fix the lens barrel 180 in the second housing 112.

[0056] Please continue to refer to Figure 4 , which schematically shows the structure of the imaging objective lens mechanism 100 of the endoscope provided by the second embodiment of the present invention in a normal state (the image is in a non-magnified state). Figure 4 As shown, the imaging objective lens mechanism 100 of the endoscope provided in this embodiment differs from the imaging objective lens mechanism 100 of the endoscope provided in the first embodiment in that, in this embodiment, the distal end of the second housing 112 is provided with a second position-limiting portion 1124 protruding toward the position of the movable frame 130, and the proximal end of the movable frame 130 is correspondingly provided with a second protruding portion 132 protruding toward the position of the second position-limiting portion 1124. Thus, the second position-limiting portion 1124 and the second protruding portion 132 cooperate with each other to effectively prevent the movable lens group 123 from colliding with the second fixed lens group 122 due to misoperation, thereby further improving the stability of the imaging objective lens mechanism 100 of the endoscope provided by the present invention during the zooming process.

[0057] Furthermore, if Figure 4 As shown, the distal end of the second spring 161 is sleeved on the second protruding portion 132, and the proximal end of the second spring 161 is sleeved on the second limiting portion 1124. Thus, this arrangement can make it easier to install and fix the second spring 161.

[0058] Please continue to refer to Figure 5 and Figure 6 ,in Figure 5 A schematic structural diagram of the movable lens group 123 in the imaging objective lens mechanism 100 of the endoscope provided by the third embodiment of the present invention is shown in FIG. Figure 6 The following schematically shows the structure of the guide post 113 and the guide hole 133 in the imaging objective lens mechanism 100 of the endoscope provided by the third embodiment of the present invention. Figure 5 and Figure 6 As shown, the imaging objective lens mechanism 100 of the endoscope provided in this embodiment differs from the imaging objective lens mechanism 100 of the endoscope provided in the first embodiment in that, in this embodiment, a guide post 113 is further provided in the lens holder 110 and is arranged parallel to the extension direction of the optical axis, and a guide hole 133 is correspondingly provided on the movable frame 130 to cooperate with the guide post 113. Thus, the mutually cooperating guide post 113 and guide hole 133 can provide guidance for the movement of the movable frame 130, further effectively ensuring that the movable frame 130 can move along the extension direction of the optical axis under the action of the magnetic force, that is, ensuring that the optical axes of the movable lens group 123, the first fixed lens group 121, and the second fixed lens group 122 are always arranged collinearly, thereby further improving the zoom accuracy of the imaging zoom mechanism provided by the present invention and effectively ensuring the imaging effect of the endoscope using the imaging objective lens mechanism 100 of the endoscope provided by the present invention. It should be noted that, as those skilled in the art will appreciate, the guide holes 133 are provided at both ends of the axial direction of the movable frame 130, and the axis of the guide holes 133 is provided parallel to the optical axis. Figure 6 The following description takes the example of two guide posts 113 being provided in the lens holder 110 and two guide holes 133 being provided on the movable frame 130. However, as those skilled in the art will appreciate, this does not constitute a limitation to the present invention. In other embodiments, one guide post 113, three guide posts 113 or more guide posts 113 may be provided in the lens holder 110, and one guide hole 133, two guide holes 133 or more guide holes 133 may be provided on the movable frame 130. The specific configuration may be based on actual conditions.

[0059] Furthermore, if Figure 5 As shown, the guide post 113 is disposed within the first housing 111. Furthermore, the guide post 113 is disposed on a first stopper 1114 within the first housing 111. Thus, by disposing the guide post 113 within the first housing 111, not only is the installation and fixation of the guide post 113 facilitated, but the internal space of the first housing 111 can also be fully utilized, further effectively ensuring that the imaging objective lens mechanism 100 of the endoscope provided by the present invention does not increase the structural dimensions of the endoscope head end. It should be noted that, as will be appreciated by those skilled in the art, in other embodiments, the guide post 113 may also be disposed on the distal end of the second housing 112.

[0060] The following combination Figure 1 、 Figure 3 and Figure 4The working principle of the imaging objective lens mechanism 100 of the endoscope provided by the present invention is described. Figure 1 、 Figure 3 and Figure 4 As shown, the initial position of the movable frame 130 is set at the middle position of its stroke. At this time, the first elastic member (first spring 151) and the second elastic member (second spring 161) are both in their initial positions. At this time, the push and pull forces generated by the first elastic member (first spring 151) and the second elastic member (second spring 161) on the movable frame 130 are balanced. Under the action of the magnetic force, the movable stroke of the movable frame 130 toward the far end at the initial position is S1, and the movable stroke toward the proximal end is S2, where S1=S2, and the total stroke of the movable frame 130 is S=S1+S2.

[0061] When the power is turned on, the power supply can input a certain amount of current, such as a positive current, through the cable 170. At this time, the coil 141 wound on the moving frame 130 generates an electromagnetic force that repels the second magnet 142 (that is, the magnetism of the first magnet is the same as the magnetism of the second magnet 142), thereby forming a positive thrust between the second magnet 142, so that the moving frame 130 moves toward the proximal end. Since the current value corresponds to the moving distance of the moving frame 130, the moving frame 130 moves to the corresponding position under the action of the current value. At this time, the first elastic member (The first spring 151) is subjected to the pulling force of the distal end of the lens mount 110 (specifically the first shell 111) and the movable frame 130, and the second elastic member (the second spring 161) is subjected to the compressive force of the proximal end of the lens mount 110 (specifically the second shell 112) and the movable frame 130. At this time, the pulling force of the first elastic member (the first spring 151), the compressive force of the second elastic member (the second spring 161), and the electromagnetic thrust generated between the coil 141 (the first magnet) and the second magnet 142 reach a balance, thereby positioning the movable frame 130 at the corresponding position. For example, when the moving frame 130 needs to move toward the near end S2 (i.e., to the end of the near end stroke), that is, when the moving frame 130 is moved to the normal position where the image is in a non-magnified state, a current of corresponding magnitude can be input. Then, when the moving frame 130 moves toward the near end S2, the first elastic member (first spring 151) is pulled by the far end of the lens mount 110 (specifically, the first shell 111) and the moving frame 130, and the second elastic member (second spring 161) is compressed by the near end of the lens mount 110 (specifically, the second shell 112) and the moving frame 130. At this time, the tension of the first elastic member (first spring 151), the compression of the second elastic member (second spring 161), and the electromagnetic thrust generated between the coil 141 (first magnet) and the second magnet 142 reach a balance, thereby positioning the moving frame 130 at the normal position where the image is in a non-magnified state. Further, as Figure 4As shown, when the movable frame 130 moves to the end of its travel at the proximal end (i.e., when the movable frame 130 is positioned at a normal position where the image is in a non-magnified state), the distance L1 between the first protrusion 131 of the movable frame 130 and the first limit portion 1114 in the first housing 111 is greater than the total travel S of the movable frame 130. Therefore, this arrangement can effectively prevent collision between the movable frame 130 and the first housing 111, further ensuring the stability of the imaging objective lens mechanism 100 of the endoscope provided by the present invention during the zooming process.

[0062] When zooming is required, the operator presses the corresponding button on the operating part of the endoscope, and the power supply inputs a certain reverse current, for example, through the cable 170. At this time, the coil 141 wound on the movable frame 130 is energized to generate an electromagnetic force that attracts the second magnet 142 (i.e., the magnetic properties of the first magnet are opposite to the magnetic properties of the second magnet 142), thereby forming a reverse thrust between the second magnet 142, so that the movable frame 130 moves toward the distal end until it moves to a position corresponding to the current value of the reverse current, thereby achieving zooming. It should be noted that, as those skilled in the art will understand, the movable frame 130 can be controlled to move to different positions by controlling the current value of the input reverse current to achieve zooming of different magnifications. In addition, it should be noted that, as those skilled in the art will understand, a button can be set on the operating part of the endoscope for each magnification. Thus, as long as the button corresponding to the target magnification is pressed, the power supply can be controlled to input a corresponding reverse current through the cable 170 to control the movable frame 130 to move to the position corresponding to the target magnification. Furthermore, if Figure 3 As shown, when the movable frame 130 moves to the distal end of its travel, the distance L2 between the second protrusion 132 of the movable frame 130 and the distal end (the second limit portion 1124) of the second housing 112 is greater than the total travel S of the movable frame 130. Thus, this arrangement can effectively prevent collision between the movable frame 130 and the first housing 111, further ensuring the stability of the imaging objective lens mechanism 100 of the endoscope provided by the present invention during the zooming process.

[0063] When it is necessary to restore the image to the normal mode in which the image is not magnified, the operator can press the corresponding button on the operating part of the endoscope, and the power supply inputs a corresponding amount of forward current through the cable 170, so that the moving frame 130 moves toward the proximal end to Figure 4 In the usual position shown.

[0064] Please continue to refer to Figure 7 , which schematically shows the structure of the first elastic member provided by another embodiment of the present invention. Figure 7As shown, in this embodiment, the first elastic member includes a plurality of first spring pieces 152 evenly spaced about the optical axis. Each of the first spring pieces 152 defines a first positioning hole 1521. A first positioning post 114 is correspondingly provided at the distal end of the lens holder 110 (specifically, the first retaining portion 1114 within the first housing 111), correspondingly engaging with the first positioning hole 1521. The first spring piece 152 also defines a second positioning hole 1522, and a second positioning post 134 is correspondingly provided at the distal end of the movable frame 130, engaging with the second positioning hole 1522. Thus, by configuring the first elastic member to include a plurality of first spring pieces 152 evenly spaced about the optical axis, the requirements for the internal spatial structure of the lens holder 110 are reduced, resulting in simplified manufacturing and higher reliability. Specifically, the first positioning hole 1521 can be secured to the first positioning post 114 by bonding, riveting, or welding, thereby achieving a secure connection between the first positioning hole 1521 and the first positioning post 114, thereby firmly securing the first spring piece 152 within the distal end of the lens holder 110. Similarly, the second positioning hole 1522 can be fixed to the second positioning column 134 and a stable connection between the second positioning hole 1522 and the second positioning column 134 can be achieved by bonding, riveting or welding, so that the proximal end of the first elastic sheet 152 can be firmly fixed to the distal end of the moving frame 130. Figure 7 The following description uses the example of a first elastic member including four first elastic pieces 152. However, as those skilled in the art will appreciate, the present invention does not limit the number of first elastic pieces 152 included in the first elastic member. In other embodiments, the number of first elastic pieces 152 can be two, three, five, six, or more, depending on the actual situation. Furthermore, the first elastic pieces 152 can be arranged symmetrically along the optical axis, and the number of symmetrical features of the first elastic pieces 152 can range from 3 to 6.

[0065] In one exemplary embodiment, the second elastic member includes a plurality of second spring plates (not shown) evenly spaced about the optical axis. The second spring plates are provided with third positioning holes (not shown). A third positioning post (not shown) is provided at the proximal end of the movable frame 130 to engage with the third positioning holes. The second spring plates are also provided with fourth positioning holes (not shown). The proximal end of the lens holder 110 (specifically, the proximal end of the second housing 112) is provided with a fourth positioning post (not shown) to engage with the fourth positioning holes. Thus, by configuring the second elastic member to include a plurality of second spring plates evenly spaced about the optical axis, the requirements for the internal spatial structure of the lens holder 110 can be further reduced, resulting in simplified manufacturing and higher reliability. Specifically, the third positioning holes can be fixed to the third positioning posts, and a secure connection between the third positioning holes and the third positioning posts can be achieved through bonding, riveting, or welding, thereby securely securing the second spring plates to the proximal end of the movable frame 130. Similarly, the fourth locating hole can be fixed to the fourth locating post and a secure connection between the fourth locating hole and the fourth locating post can be achieved by bonding, riveting, or welding, thereby securely fixing the second spring piece within the proximal end of the lens mount 110. It should be noted that, as will be understood by those skilled in the art, the present invention does not limit the number of second spring pieces included in the second elastic member. The number of second spring pieces can also be two, three, four, five, six, or more, and can be set according to actual circumstances. In addition, the structure of the second spring piece can also be symmetrically arranged along the center of the optical axis, and the number of symmetrical features of the second spring piece structure can range from 3 to 6 groups.

[0066] In addition, it should be noted that, as those skilled in the art will appreciate, the initial positions of the first elastic piece 152 and the second elastic piece are both designed to have a certain amount of deformation to generate corresponding push-pull forces during the zoom movement.

[0067] To realize the above idea, the present invention also provides a variable focus lens 10, please refer to Figure 1 、 Figures 3 to 5 ,like Figure 1 、 Figures 3 to 5As shown, the variable-focus lens 10 provided by the present invention includes a mounting base 200, an image sensor 300 disposed within the mounting base 200, and the imaging objective lens mechanism 100 for an endoscope according to any of the above-described embodiments. The distal end of the mounting base 200 is sleeved on the proximal end of the lens holder 110, and the image sensor 300 is disposed within the proximal end of the mounting base 200. Because the variable-focus lens 10 provided by the present invention includes the imaging objective lens mechanism 100 for an endoscope according to any of the above-described embodiments, the variable-focus lens 10 provided by the present invention can effectively solve the stability problem during optical zooming, improve the accuracy of positioning the movable lens group 123, and thus effectively achieve zooming. In addition, by providing an elastic reset mechanism within the lens holder 110, not only can the initial position of the movable frame 130 be accurately positioned, but it can also serve as a magnetic compensation. When power is applied, the movable frame 130 is driven by the magnetic force to achieve movement. During this movement, the elastic reset mechanism can act as a buffer, thereby ensuring smooth zooming of the variable-focus lens 10 provided by the present invention. In addition, the variable focus lens 10 provided by the present invention also fully utilizes the internal space of the lens holder 110 and does not increase the structural size of the endoscope head end.

[0068] To realize the above idea, the present invention also provides an endoscope, please refer to Figure 8 , which schematically shows a partial structural diagram of an endoscope provided by one embodiment of the present invention. Figure 8 As shown, the endoscope provided by the present invention includes the variable focus lens 10 described above. Since the endoscope provided by the present invention includes the variable focus lens 10 described above, the endoscope provided by the present invention can effectively solve the stability problem during the optical zoom process, improve the accuracy of the positioning of the movable lens group 123, and thus effectively achieve zooming. In addition, by providing an elastic reset mechanism in the lens holder 110, not only can the initial position positioning of the movable frame 130 be accurately guaranteed, but it can also play a role in magnetic compensation. When power is turned on, the movable frame 130 is driven by the magnetic force to move. During the movement, the elastic reset mechanism can play a buffering role, thereby making the endoscope provided by the present invention zoom smoothly and improving the imaging effect of the endoscope provided by the present invention.

[0069] Please continue to refer to Figure 8 ,like Figure 8 As shown, the endoscope provided by the present invention also includes a head end cover 20, a head end seat 30 and a bending portion 40. The head end cover 20 is arranged on the distal end of the head end seat 30, the zoom lens 10 is arranged in the head end seat 30, and the distal end of the zoom lens 10 passes through the head end cover 20, and the proximal end of the head end cover 20 is connected to the distal end of the bending portion 40.

[0070] Please continue to refer to Figure 8 ,like Figure 8As shown, the endoscope further comprises an instrument channel 50, whereby a prescribed portion of an instrument can be passed through the instrument channel 50 to perform a surgical operation.

[0071] It should be noted that, as those skilled in the art can understand, the endoscope provided by the present invention also has the structures of a conventional endoscope, such as a water and air supply channel, a lighting channel, and an operating part. For details, please refer to the existing technology and will not be repeated here.

[0072] To realize the above-mentioned idea, the present invention also provides an endoscope system, which includes the endoscope provided above. Since the endoscope system provided by the present invention includes the endoscope provided above, the endoscope system provided by the present invention can effectively solve the stability problem during the optical zoom process, improve the accuracy of the positioning of the movable lens group 123, and thus effectively achieve zooming. In addition, by providing an elastic reset mechanism in the lens holder 110, not only can the initial position positioning of the movable frame 130 be accurately guaranteed, but it can also play a role in magnetic compensation. When the power is turned on, the movable frame 130 is driven by the magnetic force to move. During the movement, the elastic reset mechanism can play a buffering role, thereby making the endoscope system provided by the present invention zoom smoothly and improving the imaging effect of the endoscope system provided by the present invention.

[0073] It should be noted that, as those skilled in the art will appreciate, the endoscope system provided by the present invention also includes devices possessed by conventional endoscope systems, such as an image processor, an image display, and a cold light source. For details, please refer to the prior art and will not be elaborated here.

[0074] In summary, compared with the prior art, the imaging objective lens mechanism 100 of the endoscope, the variable focus lens 10, the endoscope, and the endoscope system provided by the present invention have the following advantages: the imaging objective lens mechanism 100 of the endoscope provided by the present invention includes a lens holder 110 and a first fixed lens group 121, a second fixed lens group 122, and a movable lens group 123 installed in the lens holder 110; the movable lens group 123 is arranged between the first fixed lens group 121 and the second fixed lens group 122, and the optical axes of the movable lens group 123, the first fixed lens group 121, and the second fixed lens group 122 are arranged collinearly; the lens holder 110 is provided with a first fixed lens group 121, a second fixed lens group 122, and a second fixed lens group 123. A movable frame 130 is also provided, and a gap is formed between the outer periphery of the movable frame 130 and the inner wall of the lens holder 110. The movable lens group 123 is installed in the movable frame 130. A first magnet is embedded in the outer periphery of the movable frame 130, and a second magnet 142 is correspondingly embedded on the inner wall of the lens holder 110. The first magnet and the second magnet 142 are arranged in an annular manner. The first magnet and the second magnet 142 can attract and repel each other to drive the movable frame 130 to reciprocate along the extension direction of the optical axis; an elastic reset mechanism is also provided in the lens holder 110, and the elastic reset mechanism is arranged between the lens holder 110 and the movable frame 130. Thus, compared to the prior art, the imaging objective lens mechanism 100 of the endoscope provided by the present invention utilizes magnetic force to drive the movable lens group 123 to reciprocate along the extension direction of the optical axis. This allows the displacement of the movable lens group 123 to be unaffected by the bending angle of the curved portion 40 of the endoscope, thereby effectively solving the stability problem during optical zooming, improving the accuracy of the positioning of the movable lens group 123, and thus effectively achieving zooming. In addition, by providing an elastic reset mechanism within the lens holder 110, the present invention not only ensures the accurate initial positioning of the movable frame 130, but also provides magnetic force compensation. When power is applied, the movable frame 130 is driven by the magnetic force, and the elastic reset mechanism acts as a buffer during the movement process, thereby ensuring smooth zooming of the imaging objective lens mechanism 100 of the endoscope provided by the present invention. When power is removed, the movable frame 130 can be restored to its initial position under the action of the elastic reset mechanism. In addition, since the first magnet is embedded in the outer periphery of the movable frame 130, the second magnet 142 is embedded in the inner wall of the lens holder 110, and the first magnet and the second magnet 142 are arranged in a ring, internal space can be saved. By effectively utilizing the limited space inside the lens holder 110, the size of the endoscope head end structure will not be increased. At the same time, the movable lens group 123, the movable frame 130, and the first magnet are integrated into one body, effectively reducing the number of internal parts, simplifying assembly, and increasing reliability. In addition, since the movement and positioning accuracy of the movable module (including the movable lens group 123, the movable frame 130, and the first magnet) can be guaranteed by the elastic reset mechanism, the accuracy requirements for the first magnet, the second magnet 142, and the corresponding mounting structural parts are reduced.Furthermore, since there is a gap between the outer periphery of the movable frame 130 and the inner wall of the lens holder 110, the movable module (including the movable lens group 123, the movable frame 130 and the first magnet) will not wear against the second magnet 142 and the inner wall of the lens holder 110 during the movement, thereby effectively preventing the fine powder generated by wear from adhering to the lens and affecting the quality of the captured image.

[0075] Since the variable focus lens 10, endoscope, and endoscope system provided by the present invention belong to the same inventive concept as the imaging objective lens mechanism 100 of the endoscope provided by the present invention, the variable focus lens 10, endoscope, and endoscope system provided by the present invention have all the advantages of the imaging objective lens mechanism 100 of the endoscope provided by the present invention, so the beneficial effects of the variable focus lens 10, endoscope, and endoscope system provided by the present invention will not be described one by one here.

[0076] The above description is merely a description of preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes or modifications made by persons skilled in the art based on the above disclosure are within the scope of protection of the present invention. Obviously, various modifications and variations may be made by persons skilled in the art without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the present invention and its equivalents, the present invention is intended to include such modifications and variations.

Claims

1. An imaging objective lens mechanism of an endoscope, characterized in that: It comprises a lens mount and a first fixed lens group, a second fixed lens group and a movable lens group installed in the lens mount; The movable mirror group is arranged between the first fixed mirror group and the second fixed mirror group, and the optical axes of the movable mirror group, the first fixed mirror group and the second fixed mirror group are arranged collinearly; A movable frame is further provided in the lens mount, with a gap between the outer periphery of the movable frame and the inner wall of the lens mount. The movable lens group is mounted in the movable frame. A first magnet is embedded in the outer periphery of the movable frame, and a second magnet is correspondingly embedded on the inner wall of the lens mount. The first magnet and the second magnet are arranged in an annular manner. At least one of the first magnet and the second magnet is an energized coil. The first magnet and the second magnet can attract and repel each other to drive the movable frame to reciprocate along the extension direction of the optical axis. The lens mount is further provided with an elastic reset mechanism, the elastic reset mechanism comprising a first elastic member and a second elastic member, the first elastic member being arranged between the lens mount and the distal end of the movable frame, and the second elastic member being arranged between the lens mount and the proximal end of the movable frame; The initial position of the movable frame is set at the middle position of its travel, at which time the push and pull forces generated by the first elastic member and the second elastic member on the movable frame are balanced; When the tension exerted on the first elastic member by the distal end of the lens mount and the movable frame, the compression exerted on the second elastic member by the proximal end of the lens mount and the movable frame, and the magnetic thrust generated between the first magnet and the second magnet reach a balance, the movable frame can be positioned at a normal position where the image is in a non-magnified state.

2. The imaging objective lens mechanism of the endoscope according to claim 1, characterized in that: A coil is embedded in the outer periphery of the movable frame. When energized, the coil can form the first magnet. The second magnet is a permanent magnet. There are multiple second magnets, which are evenly arranged around the optical axis.

3. The imaging objective lens mechanism of the endoscope according to claim 2, characterized in that: An annular groove matching the coil is provided on the outer periphery of the movable frame, and the coil is embedded in the annular groove.

4. The imaging objective lens mechanism of the endoscope according to claim 2, characterized in that: A plurality of mounting grooves corresponding to the second magnets are provided on the inner wall of the lens holder, and the second magnets are embedded in the mounting grooves.

5. The imaging objective lens mechanism of the endoscope according to claim 1, characterized in that: The first elastic member includes a plurality of first springs evenly arranged around the optical axis, the distal ends of the first springs are connected to the lens mount, and the proximal ends of the first springs are connected to the distal end of the movable frame; and / or the second elastic member includes a plurality of second springs evenly arranged around the optical axis, the proximal ends of the second springs are connected to the lens mount, and the distal ends of the second springs are connected to the proximal end of the movable frame.

6. The imaging objective lens mechanism of the endoscope according to claim 1, characterized in that: The first elastic member includes a plurality of first elastic pieces uniformly arranged around the optical axis, the first elastic pieces are provided with a first positioning hole, a first positioning post cooperating with the first positioning hole is correspondingly provided at the distal end of the lens mount, the first elastic piece is further provided with a second positioning hole, a second positioning post cooperating with the second positioning hole is correspondingly provided at the distal end of the movable frame; and / or The second elastic member includes a plurality of second spring pieces evenly arranged around the optical axis, the second spring pieces are provided with a third positioning hole, the proximal end of the movable frame is correspondingly provided with a third positioning column that cooperates with the third positioning hole, the second spring piece is also provided with a fourth positioning hole, and the proximal end of the lens mount is correspondingly provided with a fourth positioning column that cooperates with the fourth positioning hole.

7. The imaging objective lens mechanism of an endoscope according to claim 1, characterized in that: The lens mount includes a first shell and a second shell connected along the direction from the distal end to the proximal end, the first fixed mirror group is arranged in the distal end of the first shell, the movable frame is arranged in the proximal end of the first shell, the second magnet is arranged on the inner wall of the first shell, the second fixed mirror group is arranged in the second shell, the first elastic member is connected to the first shell, and the second elastic member is connected to the second shell.

8. The imaging objective lens mechanism of the endoscope according to claim 7, characterized in that: A first limiting portion is provided in the first shell, and a first protruding portion protruding toward the first limiting portion is provided at the distal end of the movable frame.

9. The imaging objective lens mechanism of the endoscope according to claim 7, characterized in that: A second limiting portion is provided in the second shell body, and a second protruding portion protruding toward the second limiting portion is provided at the proximal end of the movable frame.

10. The imaging objective lens mechanism of the endoscope according to claim 7, characterized in that: A lens barrel for mounting the second fixed lens group is further provided in the second shell. A step portion is provided in the second shell, and an overlapping portion cooperating with the step portion is provided on the outer periphery of the lens barrel.

11. The imaging objective lens mechanism of an endoscope according to claim 7, characterized in that: The proximal end of the first shell is provided with a mounting position, and the distal end of the second shell is correspondingly provided with a connecting portion that matches the mounting position. The distal end of the second shell extends circumferentially along its outer periphery to form the connecting portion.

12. A zoom lens, characterized in that: An imaging objective lens mechanism of an endoscope comprising any one of claims 1 to 11, a mounting seat, and an image sensor disposed in the mounting seat, wherein the distal end of the mounting seat is sleeved on the proximal end of the lens seat, and the image sensor is disposed in the proximal end of the mounting seat.

13. An endoscope, characterized in that: The invention comprises the variable focus lens according to claim 12.

14. An endoscope system, characterized in that: Including the endoscope according to claim 13.

Images