Optical device and endoscope

Abstract

The embodiment of the invention provides an optical device and an endoscope. The optical device includes: a main body configured to accommodate a non-moving lens; a movable lens holding frame configured to accommodate a movable lens, the movable lens holding frame being movably engaged with the main body in an optical axis direction of the movable lens; the annular magnet is mounted on the movable lens holding frame, and magnetic poles at the two ends of the annular magnet are arranged in the optical axis direction of the movable lens; and the driving part is mounted on the main body, is positioned on the outer side of the annular magnet, and is configured to drive the annular magnet to move along the optical axis direction of the movable lens so as to change the focal length between the movable lens and the non-movable lens.

Description

Cross-references

[0001] This application claims priority to Chinese application No. 202310836796.3 filed on July 7, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present specification relates to the field of medical devices, and in particular to an optical device and an endoscope. Background Art

[0003] With the development of medical technology, soft endoscopes are widely used in the inspection and treatment of diseases through the natural openings of the body. The endoscope is inserted into the object for observation and imaging using the optical system for diagnosis and treatment. The image quality is crucial to the diagnosis and treatment process. During diagnosis and treatment, the movable lens group is driven for zoom imaging to improve the image quality. How to ensure that the lens can maintain accurate and stable sliding while ensuring the control of the driving force of the zoom lens is an urgent problem to be solved in the endoscope optical drive system. Summary of the invention

[0004] One of the embodiments of the present specification provides an optical device, which includes: a main body, configured to accommodate a non-movable lens; a movable lens holding frame, configured to accommodate a movable lens, the movable lens holding frame being movably matched with the main body along the optical axis direction of the movable lens; an annular magnet, mounted on the movable lens holding frame, the magnetic poles at both ends of the annular magnet being arranged along the optical axis direction of the movable lens; a driving member, mounted on the main body and located outside the annular magnet, the driving member being configured to drive the annular magnet to move along the optical axis direction of the movable lens, thereby changing the focal length between the movable lens and the non-movable lens.

[0005] In some embodiments, the annular magnet includes a first annular magnet and a second annular magnet, and the polarities between the two facing magnetic poles of the first annular magnet and the second annular magnet are opposite; two annular grooves are provided on the movable lens retaining frame along the optical axis direction of the movable lens, and the first annular magnet and the second annular magnet are respectively installed in the two annular grooves.

[0006] In some embodiments, the distance between the first annular magnet and the second annular magnet ranges from 0.05 mm to 0.15 mm.

[0007] In some embodiments, the movable lens holding frame and the annular magnet are both made of magnetic materials, and the movable lens holding frame and the annular magnet are integrally formed.

[0008] In some embodiments, the movable lens holding frame includes an outer shell and an inner shell, the outer shell has a first width along the axial direction, the inner shell has a second width along the axial direction, and the first width is smaller than the second width.

[0009] In some embodiments, a ratio of the first width to the second width ranges from 0.55 to 0.98.

[0010] In some embodiments, the annular magnet is installed between the outer shell and the inner shell, and the annular magnet has a third width along the axial direction of the inner shell, the third width is greater than or equal to the first width, and the third width is less than or equal to the second width.

[0011] In some embodiments, the driving member includes a coil wound around the outside of the main body, and the coil is configured to apply a driving force to the annular magnet along the optical axis direction of the movable lens after being energized, so that the movable lens holding frame moves between an initial position and a zoom position; the movable lens holding frame is located in the middle of the axial direction of the coil; or, the movable lens holding frame is located at the end of the axial direction of the coil.

[0012] In some embodiments, the main body includes a limit sleeve, the limit sleeve includes a limit groove, the movable lens retaining frame is installed in the limit groove, and the limit groove is configured to limit the radial displacement of the movable lens retaining frame, and is configured to limit the axial travel range of the movable lens retaining frame.

[0013] In some embodiments, the limiting sleeve includes a lens mounting portion, the lens mounting portion is provided with at least one positioning groove, and the at least one positioning groove is configured to mount at least one non-movable lens.

[0014] In some embodiments, the limiting sleeve includes a second sleeve, which is located in the limiting groove; the movable lens holding frame includes a accommodating hole, the movable lens is arranged at the front end of the accommodating hole, and the inner diameter of the rear end of the accommodating hole is larger than the outer diameter of the front end of the second sleeve.

[0015] In some embodiments, at least one spacer is disposed in the lens mounting portion, and the at least one spacer is configured to limit the axial displacement of the at least one non-movable lens in the limiting sleeve.

[0016] In some embodiments, the optical device includes a front lens holding frame and a front lens group, wherein the front lens holding frame is disposed at the front end of the movable unit, and the front lens holding frame is configured to install the front lens group.

[0017] In some embodiments, the optical device includes a first bracket, which is a cylindrical bracket and is arranged on the outer peripheral side of the limiting sleeve.

[0018] In some embodiments, the first bracket includes a large diameter portion, and a coil accommodating compartment is provided inside the large diameter portion.

[0019] In some embodiments, the optical device includes a second bracket, the first bracket also includes a small diameter portion, the second bracket is a cylindrical bracket, and the second bracket is sleeved on the outside of the small diameter portion.

[0020] In some embodiments, the optical device includes a third bracket, which is disposed at a rear end of the first bracket and is configured to accommodate an imaging component.

[0021] One of the embodiments of the present specification provides an endoscope, which includes the optical device as described in the above embodiment.

[0022] According to the above technical solution, the annular magnet is configured to drive the movable lens to achieve zooming, which has a simple structure and is conducive to the small size of the movable unit. In addition, the driving member is arranged on the outside of the movable unit to avoid interfering with the movement of the movable unit, prevent the movable unit from getting stuck, etc., and improve the stability and accuracy of zooming. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein:

[0024] Figure 1 is an exploded schematic diagram of a movable unit according to some embodiments of the present specification;

[0025] Figure 2 is a cross-sectional view of a movable unit according to some embodiments of the present specification;

[0026] Figure 3A The structure of the movable lens holding frame shown in some embodiments of this specification is schematically shown in FIG. Figure 1 ;

[0027] Figure 3B The structure of the movable lens holding frame shown in some embodiments of this specification is schematically shown in FIG. Figure 2 ;

[0028] Figure 4 It is a schematic diagram of a structure in which a movable lens holding frame is assembled in a limiting sleeve according to some embodiments of this specification;

[0029] Figure 5 is an exploded schematic diagram of an optical device according to some embodiments of the present specification;

[0030] Fig. 6A is a cross-sectional view of an optical device according to some embodiments of the present specification Figure 1 ;

[0031] Figure 6B is a cross-sectional view of an optical device according to some embodiments of the present specification Figure 2 ;

[0032] Figure 7 is a schematic diagram of a coil and a movable unit according to some embodiments of the present specification;

[0033] Figure 8 is a schematic diagram of the current direction and magnetic field direction when the coil is energized according to some embodiments of this specification;

[0034] Fig. 9A is a schematic diagram of the structure of a front lens holding frame according to some embodiments of this specification;

[0035] Fig. 9B is a schematic diagram of the structure of a front lens holding frame according to some embodiments of this specification;

[0036] Fig. 10A The structure of the limiting sleeve shown in some embodiments of this specification is shown in FIG. Figure 1 ;

[0037] Fig. 10B The structure of the limiting sleeve shown in some embodiments of this specification is shown in FIG. Figure 2 ;

[0038] Fig.11A This is a schematic diagram of the structure of the first bracket according to some embodiments of this specification. Figure 1 ;

[0039] Fig. 11B This is a schematic diagram of the structure of the first bracket according to some embodiments of this specification. Figure 2 ;

[0040] Fig.12 is a schematic diagram of the structure of a second bracket according to some embodiments of this specification;

[0041] Fig.13 is a schematic diagram of the structure of a second bracket according to some embodiments of this specification;

[0042] Fig.14 is a cross-sectional view of an optical device according to other embodiments of the present specification;

[0043] Fig.15 It is a schematic diagram of the structure of an optical device according to some embodiments of the present specification.

[0044] Among them, the figure markings are: 1, movable unit; 11, movable lens holding frame; 111, accommodating hole; 112, first positioning portion; 113, annular groove; 114, outer shell; 115, inner shell; 10, annular magnet; 12, first annular magnet; 13, second annular magnet; 2, limiting sleeve; 21, limiting groove; 211, annular side wall; 212, bottom wall; 22, movable unit accommodating portion; 23, lens mounting portion; 231, positioning groove; 2311, first positioning groove; 2312, second positioning groove; 232, spacer; 2321, first spacer; 2322, second spacer; 24, first sleeve; 25, second sleeve; 26, third sleeve; 3, front end lens holding frame; 31, hollow hole; 32, second Positioning portion; 33, limiting recess; 34, first protrusion; 341, stop surface; 35, second protrusion; 4, driving member; 41, coil; 5, first bracket; 51, large diameter portion; 52, small diameter portion; 53, shoulder; 54, first matching portion; 55, wiring hole; 6, second bracket; 61, second matching portion; 62, convex portion; 63, third matching portion; 7, third bracket; 71, fourth matching portion; 72, hole; 73, wire groove; 8, elastic member; 101, movable lens; 102, front end lens group; 103, third lens; 104, fourth lens; 105, fifth lens; 106, sixth lens; 107, seventh lens; 108, imaging component; W1, first width; W2, second width; W3, third width. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0046] It should be understood that the "system", "device", "unit" and / or "module" used herein are a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0047] As shown in this specification and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0048] Endoscopes are medical instruments for observing the inside of the human body, including but not limited to cystoscopes, gastroscopes, laparoscopes, etc. The imaging quality of an endoscope is related to the diagnosis and treatment effect. The higher the imaging quality, the better the diagnosis and treatment effect. In some embodiments, the imaging quality is improved by adjusting the zoom of the lens group of the endoscope. The zoom adjustment of the endoscope can change the imaging quality by changing the focal position of the lens. The lens zoom method includes but is not limited to the electromagnetic field generated by the energized coil to drive the magnet to move, thereby driving the movable lens to move, changing the focal length of the movable lens, and improving the imaging quality.

[0049] First of all, it should be explained that the "front" and "rear" involved in the embodiments of this specification can represent the orientation along the length direction of the endoscope. When the endoscope enters the human body, the side facing the operator is "rear" and the side facing the lens is "front"; in the accompanying drawings, T represents the forward viewing direction of the axial direction of the view shown, and B represents the rear viewing direction of the axial direction of the view shown; in addition, the "front end" and "rear end" involved in the embodiments of this specification should not be understood as only representing the end parts, but can also be understood as at least a partial section in this orientation.

[0050] Some embodiments of the present specification provide an optical device, which includes a main body and a movable unit. The main body includes a structure such as a non-movable component of the optical device, which is used to install and accommodate a non-movable lens; the movable unit is arranged in the main body and is configured to drive at least one lens of the endoscope to move, so as to change the focal length between the lenses and realize zoom adjustment. In some embodiments, the optical device includes but is not limited to an endoscope, a detection scope, a camera, etc.

[0051] Figure 1 It is a schematic exploded view of the movable unit 1 according to some embodiments of the present specification. Figure 2 is a cross-sectional view of the movable unit 1 according to some embodiments of the present specification; Figure 3A The structure of the movable lens holding frame 11 shown in some embodiments of this specification is schematically shown in FIG. Figure 1 ; Figure 3B The structure of the movable lens holding frame 11 shown in some embodiments of this specification is schematically shown in FIG. Figure 2 . Figure 4 It is a schematic diagram of the structure in which the movable lens holding frame 11 is assembled in the limiting sleeve 2 according to some embodiments of this specification.

[0052] like Figures 1 to 4 As shown, in some embodiments, the movable unit 1 includes a movable lens holding frame 11 and a ring magnet 10.

[0053] In some embodiments, the movable lens holding frame 11 is configured to accommodate the movable lens 101, and the movable lens holding frame 11 is movably matched with the main body along the optical axis direction of the movable lens 101. In some embodiments, a receiving hole 111 is formed in the movable lens holding frame 11, and the receiving hole 111 is used to accommodate the movable lens 101. In some embodiments, the movable lens holding frame 11 includes a first positioning portion 112, such as a step or a groove, etc., and the first positioning portion 112 is configured to install and fix the movable lens 101. In some embodiments, the first positioning portion 112 is provided at the port or inside of the hole, and the movable lens 101 cooperates with the first positioning portion 112 to be installed in the movable lens holding frame 11, and maintains synchronous movement with the movable lens holding frame 11.

[0054] In some embodiments, the annular magnet 10 is mounted on the movable lens holding frame, and the two magnetic poles of the annular magnet are arranged along the optical axis direction of the movable lens. The annular magnet 10 is configured to drive the movable lens 101 to achieve zooming. In some embodiments, the optical device includes a driving member 4 and the movable unit 1 as described above, and the driving member 4 is configured to drive the movable unit 1 to move. The focal length of the movable lens 101 is adjusted by moving the movable unit 1 to improve the imaging quality. In some embodiments, the driving member 4 includes but is not limited to a magnetic induction coil, a telescopic rod, a traction wire, a motor, a gear transmission mechanism, etc., and this specification does not limit this.

[0055] In some embodiments, the driving member 4 is mounted on the main body and is located outside the annular magnet 10. The driving member 4 is configured to drive the annular magnet 10 to move along the optical axis direction of the movable lens 101, thereby changing the focal length between the movable lens 101 and the non-movable lens. The driving member 4 is arranged outside the annular magnet 10, and when the driving member 4 drives the annular magnet 10 to move, the driving member 4 will not interfere with the movement of the movable unit 1.

[0056] According to the above technical solution, the annular magnet 10 is configured to drive the movable lens 101 to achieve zooming, which has a simple structure and is conducive to the small size of the movable unit 1. The driving member 4 is arranged on the outside of the movable unit 1 to avoid interfering with the movement of the movable unit 1, prevent the movable unit 1 from getting stuck, etc., and improve the stability and accuracy of zooming.

[0057] In some embodiments, the annular magnet 10 includes a first annular magnet 12 and a second annular magnet 13, and the two annular magnets are respectively mounted on the movable lens holding frame 11 along the optical axis direction of the movable lens 101, and the polarities of the two magnetic poles facing each other of the first annular magnet 12 and the second annular magnet 13 are opposite. For example, the magnetic pole of the first annular magnet 12 facing the second annular magnet 13 is the S pole, and the magnetic pole of the second annular magnet 13 facing the first annular magnet 12 is the N pole, and vice versa. The polarities of the two magnetic poles facing each other of the first annular magnet 12 and the second annular magnet 13 are opposite, so that the two magnets are retained in the movable lens holding frame 11 by mutual attraction, and there is no need to fix the two magnets by gluing, welding, etc., which reduces the difficulty of assembly.

[0058] In some embodiments, the magnetic pole directions of the first annular magnet 12 and the second annular magnet 13 are along the optical axis direction of the movable lens 101. For example, one end face of the first annular magnet 12 is an N pole, and the other end face is an S pole, and one end face of the second annular magnet 13 is an N pole, and the other end face is an S pole, and the magnetic pole directions are arranged in sequence along the optical axis direction of the movable lens 101. In this way, the first annular magnet 12 and the second annular magnet 13 move along the optical axis direction of the movable lens 101, thereby driving the movable lens 101 to move along its optical axis direction, and zooming is achieved by adjusting the position of the movable lens 101.

[0059] In some embodiments, two annular grooves 113 are provided on the movable lens holding frame 11 along the optical axis direction of the movable lens 101, and the first annular magnet 12 and the second annular magnet 13 are installed in the two annular grooves 113. The polarities of the two facing magnetic poles of the first annular magnet 12 and the second annular magnet 13 are opposite, and they are attracted to each other in the two annular grooves 113, so as to be held in the two annular grooves 113, reducing the difficulty of assembly.

[0060] In some embodiments, the front end surface of the movable lens holding frame 11 is axially recessed to form an annular groove 113, and the rear end surface of the movable lens holding frame 11 is axially recessed to form another annular groove 113. In some embodiments, the side circumference of the movable lens holding frame 11 is radially recessed to form two annular grooves 113. In some embodiments, the two annular grooves 113 may also be constructed in other forms.

[0061] In some embodiments, the spacing between the first annular magnet 12 and the second annular magnet 13 ranges from 0.05 mm to 0.15 mm. For example, the spacing between the two annular magnets is 0.05 mm, 0.07 mm, 0.1 mm, 0.12 mm, etc. In other words, the gap between adjacent annular grooves 113 ranges from 0.05 mm to 0.15 mm, so that the spacing between the two annular magnets is maintained within the range of 0.05 mm to 0.15 mm. Within such a spacing range, the two annular magnets provide sufficient adsorption force to each other so that they are kept in the two annular grooves, and other limiting structures can be simplified.

[0062] In some embodiments, the movable lens holding frame 11 and the annular magnet 10 are both made of magnetic materials, and the movable lens holding frame 11 and the annular magnet 10 are integrally formed. This simplifies the structure and prevents the annular magnet 10 from falling off the movable lens holding frame 11. In some other embodiments, the movable lens holding frame 11 and the annular magnet 10 are made of different materials, the annular magnet 10 can be a permanent magnet, and the movable lens holding frame 11 can be made of a metal material or a non-metal composite material.

[0063] like Figure 2 As shown, in some embodiments, the movable lens holding frame 11 includes an outer shell 114 and an inner shell 115. The outer shell 114 and the inner shell 115 can be cylindrical structures. Two annular grooves 113 are formed between the inner shell 115 and the outer shell 114. The two annular grooves 113 are respectively located at the front end surface and the rear end surface of the movable lens holding frame 11. The two annular grooves 113 respectively accommodate the first annular magnet 12 and the second annular magnet 13. In some embodiments, the hollow space inside the inner shell 115 is configured as an accommodating hole 111 for accommodating the movable lens 101. In some embodiments, a first positioning portion 112 is provided on the inner side of the front end of the inner shell 115, and the movable lens 101 is fixed to the front end of the inner shell 115 through the first positioning portion 112.

[0064] Since the movable lens holding frame 11 is a small precision part, it is difficult to maintain the outer surface of the outer shell 114 in an absolutely parallel state during the processing. For example, part of the outer surface of the outer shell 114 may not be parallel to another part of the outer surface. Based on this, in some embodiments, the outer shell 114 has a first width W1 along the axial direction, and the inner shell 115 has a second width W2 along the axial direction. The first width W1 is smaller than the second width W2, which is conducive to positioning the movable lens holding frame 11 during the movement through the outer shell 114, thereby improving the positioning accuracy. By reducing the first width W1, the matching gap between the outer shell 114 and the main body is reduced, so that the outer surface of the outer shell 114 fits more closely with the main body, thereby improving the positioning accuracy.

[0065] In some embodiments, in order to realize positioning of the movable lens holding frame 11 during movement through the outer shell 114 and improve positioning accuracy, the ratio of the first width W1 to the second width W2 is in the range of 0.55 to 0.98. For example, the first width W1 is 1.12 mm, and the second width W2 is 1.87 mm. For another example, the first width W1 is 1.35 mm, and the second width W2 is 1.6 mm. The outer shell 114 has a certain width, which can enable the movable lens holding frame 11 to maintain stability during the sliding process.

[0066] In some embodiments, the first annular magnet 12 and the second annular magnet 13 are installed between the outer shell 114 and the inner shell 115, and the first annular magnet 12 and the second annular magnet 13 have a third width W3 in the axial direction of the inner shell 115, wherein the third width W3 can be the sum of the axial thickness of the first annular magnet 12, the axial thickness of the second annular magnet 13, and the thickness of the wall between the first annular magnet 12 and the second annular magnet 13.

[0067] In some embodiments, the third width W3 is greater than or equal to the first width W1 , and the third width W3 is less than or equal to the second width W2 , so as to facilitate mounting the first annular magnet 12 and the second annular magnet 13 in the two annular grooves 113 .

[0068] like Figure 4 As shown, in some embodiments, the movable unit 1 is movably disposed in a limiting sleeve 2, and the limiting sleeve 2 is configured to limit the movable lens retaining frame 11 so that the movable unit 1 moves along a limited orientation, thereby improving the sliding stability and positioning accuracy of the movable unit 1.

[0069] In some embodiments, the limiting sleeve 2 includes a limiting groove 21, and the movable lens holding frame 11 is installed in the limiting groove 21. The limiting groove 21 is configured to limit the radial displacement of the movable lens holding frame 11, and is configured to limit the axial travel range of the movable lens holding frame 11. In some embodiments, the limiting groove 21 includes an annular side wall 211 and a bottom wall 212; the outer shell 114 of the movable lens holding frame 11 is in contact with the annular side wall 211, thereby limiting the radial displacement of the movable lens holding frame 11; the movable unit 1 can move axially in the limiting sleeve 2, and its farthest backward movement position is located at a position abutting against the bottom wall 212 of the limiting sleeve 2, so as to control the zoom distance of the movable unit 1 and improve the positioning accuracy of the zoom drive.

[0070] In some embodiments, a front end lens holding frame 3 may be provided at the front end of the limiting sleeve 2. The front end lens holding frame 3 is located at the front end opening of the limiting groove 21. The farthest position that the movable unit 1 can move forward is located at the position abutting against the front end lens holding frame 3. For more embodiments of the front end lens holding frame 3, see Fig. 9A and Fig. 9B and its related description.

[0071] Figure 5 is an exploded schematic diagram of an optical device according to some embodiments of the present specification. Fig. 6A is a cross-sectional view of an optical device according to some embodiments of the present specification Figure 1 . Figure 6B is a cross-sectional view of an optical device according to some embodiments of the present specification Figure 2 . Figure 7 It is a schematic diagram of the coil 41 and the movable unit 1 according to some embodiments of this specification. Figure 8 It is a schematic diagram of the current direction and the magnetic field direction when the coil 41 is energized according to some embodiments of this specification.

[0072] like Figures 5 to 8 As shown, in some embodiments, the driving member 4 includes a coil 41 wound on the outside of the movable unit 1, and the coil 41 is configured to control the movement of the movable unit 1 according to the current input to the coil 41. In some embodiments, the coil 41 is wound in a circumferential direction relative to the movable unit 1. After the coil 41 is energized, the magnetic field generated inside it is substantially along the axial direction, thereby generating a driving force along the axial direction of the movable unit 1. In some embodiments, the direction of the driving force on the movable unit 1 is changed by changing the direction of the current input to the coil 41. In some embodiments, the magnitude of the driving force on the movable unit 1 is changed by changing the magnitude of the current input to the coil 41. In some embodiments, the current range of the coil 41 includes 0.1A to 0.5A. Within this range, the driving force can overcome the resistance of the movable unit 1 and drive the movable unit 1 to move. In some embodiments, the weight of the movable unit 1 is about 0.2g, and the resistance it is subjected to is very small. The driving force generated after the coil 41 is energized is much greater than the resistance of the movable unit 1. Therefore, the position of the movable unit 1 can be quickly changed to achieve fast focusing.

[0073] In some embodiments, the coil 41 is wound in a ring relative to the movable unit 1, the first annular magnet 12 is respectively an N pole and an S pole along the axial direction, and the second annular magnet 13 is respectively an N pole and an S pole along the axial direction; when the coil 41 is energized, a magnetic field is generated inside the coil 41 along the optical axis direction of the movable lens 101, and the magnetic field generates a driving force along the optical axis direction of the movable lens 101 on the first annular magnet 12 and the second annular magnet 13, thereby driving the movable unit 1 (such as the movable lens holding frame 11) to switch between the initial position and the zoom position. In some embodiments, the zoom position is located at the position of the bottom wall 212 of the limiting groove 21 of the limiting sleeve 2, and the initial position is located at the position of the front end of the limiting groove 21 of the limiting sleeve 2. In some embodiments, the zoom position is located at the position of the front end of the limiting groove 21 of the limiting sleeve 2, and the initial position is located at the position of the bottom wall 212 of the limiting groove 21 of the limiting sleeve 2. In some embodiments, the zoom position and the initial position also include other positions in the limiting sleeve 2.

[0074] In some embodiments, when a positive current flows into the coil 41, a current is generated inside the coil 41 toward the adjacent Figure 8 The magnetic field in the direction indicated by B in the figure produces a magnetic field on the first annular magnet 12 and the second annular magnet 13 toward the adjacent Figure 8 The movable lens holding frame 11 is attracted in the direction shown in B in the figure, and then the movable lens holding frame 11 is driven to move. The movable lens holding frame 11 can continue to move to the zoom position by continuously supplying current. When the coil 41 continuously supplies positive current or is powered off, the movable lens holding frame 11 remains in the zoom position, and the optical device can be operated to collect images. When a reverse current is supplied to the coil 41, a force is generated inside the coil 41 along the axis toward the adjacent Figure 8 The magnetic field in the direction indicated by T in the figure produces a magnetic field on the first annular magnet 12 and the second annular magnet 13 toward the adjacent Figure 8 The repulsive effect in the direction shown by T in the middle drives the movable lens holding frame 11 to restore the initial position. When the coil 41 continues to pass a reverse current or is powered off, the movable lens holding frame 11 remains in the initial position.

[0075] In some embodiments, the optical device adopts a dual-position zoom mode, that is, the movable lens 101 switches only between the initial position and the zoom position, such as the position of the front end of the limiting groove 21 of the limiting sleeve 2 and the position of the bottom wall 212 of the limiting groove 21 of the limiting sleeve 2. According to the direction of the current passed through the coil 41, the movable lens holding frame 11 is driven to continue to move forward or backward until it reaches the zoom position, and the imaging focal length is adjusted.

[0076] In some embodiments, the optical device further includes a sensor, which is disposed at the front end of the limiting groove 21 of the limiting sleeve 2 and / or at the bottom wall 212 of the limiting groove 21 of the limiting sleeve 2, and is used to detect whether the movable lens holding frame 11 moves to the focusing position, thereby determining whether the coil 41 continues to be powered on or off. By way of example, the sensor includes but is not limited to a Hall sensor, an encoder, and the like.

[0077] In some embodiments, the movable unit 1 is located in the middle of the axial direction of the coil 41. The middle of the axial direction of the coil 41 refers to the midpoint of the coil 41 in the axial direction, or the portion within a preset length range on the left and / or right side of the midpoint. For example, the midpoint of the movable unit 1 in the axial direction is located at the midpoint of the coil 41 in the axial direction, that is, the midpoint of the movable unit 1 in the axial direction is aligned with the midpoint of the coil 41 in the axial direction. For another example, the midpoint of the movable unit 1 in the axial direction is located within a preset length range on the left and / or right side of the midpoint of the coil 41 in the axial direction.

[0078] In some embodiments, the limiting groove 21 of the limiting sleeve 2 provides a movable space for the movable unit 1, and the axial distance of the movable space is L1. L1 is the distance between the surface of the front lens holding frame 3 facing the limiting groove 21 and the surface of the bottom wall 212 of the limiting groove 21. The first annular magnet 12 and the second annular magnet 13 have a third width W3 along the axial direction of the inner shell 115. The axial width of the coil 41 is L2. Then the movable

[0079] =L1-W2. In some embodiments, when the movable unit 1 is in the initial position, the movable unit 1 is located in the middle of the axial direction of the coil 41, that is, the value of (L2-d) / W3 is in the range of 0.6 to 1.8, then the movable unit 1 can be located in the middle of the axial direction of the coil 41, so that the coil 41 can provide driving force for the first annular magnet 12 and the second annular magnet 13. In some embodiments, the axial distance L1 of the movable space of the limiting groove 21 is in the range of 2.0mm to 2.5mm. In some embodiments, the third width W3 is in the range of 1.0mm to 1.55mm. In some embodiments, the axial width L2 of the coil 41 is in the range of 2.5mm to 3.5mm.

[0080] In some embodiments, the movable unit 1 is located at the axial end of the coil 41. For embodiments related to the movable unit 1 being located at the axial end of the coil 41, please refer to Fig.14 and its related description.

[0081] Fig. 9A is a schematic diagram of the structure of the front lens holding frame 3 according to some embodiments of this specification; Fig. 9B It is a schematic diagram of the structure of the front lens holding frame 3 shown in some embodiments of this specification.

[0082] like Figure 5 , Fig. 6A , Figure 6B , Fig. 9A and Fig. 9B As shown, in some embodiments, the optical device includes a front lens holding frame 3 and a front lens group 102, and the front lens holding frame 3 is configured to install the front lens group 102. In some embodiments, the front lens holding frame 3 is constructed as a ring with a hollow hole 31, and the inner wall of the hollow hole 31 is provided with a second positioning portion 32, and the front lens group 102 is fixed in the hollow hole 31 of the front lens holding frame 3 through the second positioning portion 32. Among them, the second positioning portion 32 includes but is not limited to a limiting step, a limiting groove, etc. In some embodiments, the second positioning portion 32 is provided at the rear end of the hollow hole 31, and the front lens group 102 is installed in front of the second positioning portion 32 to expand the field of view of the front lens group 102. In some embodiments, the front lens group 102 includes a first lens and a second lens, and the optical axes of the first lens and the second lens are aligned with the optical axis of the movable lens 101.

[0083] In some embodiments, the front lens holding frame 3 is disposed at the front end of the movable unit 1. In some embodiments, the optical device further comprises a limiting sleeve 2, and a limiting recess 33 is provided on the rear end surface of the front lens holding frame, and the limiting recess 33 cooperates with the front end port of the limiting sleeve 2 to connect the front lens holding frame and the limiting sleeve 2. In some embodiments, the front lens holding frame 3 cooperates with the limiting sleeve 2 coaxially, so that the optical axes of the front lens group, the movable lens 101 and the non-movable lens are coaxially arranged to improve the imaging quality.

[0084] In some embodiments, a first protrusion 34 is provided on the front lens holding frame 3. The first protrusion 34 is an annular protrusion surrounding the hollow hole 31, and the surface of the first protrusion 34 forms a stop surface 341. When the front end port of the limiting sleeve 2 is fitted into the limiting recess 33 in the front lens holding frame 3, the first protrusion 34 extends into the interior of the limiting sleeve 2, and the stop surface 341 limits the distance that the movable unit 1 moves forward.

[0085] In some embodiments, the axial length of the first protrusion 34 extending into the interior of the limiting sleeve 2 can be in the range of 0.5mm to 0.9mm, which can not only ensure the stability of the connection between the front lens retaining frame 3 and the limiting sleeve 2, but also leave enough room for movement for the movable unit 1. In some embodiments, in order to further ensure the stability of the connection and leave enough room for movement for the movable unit 1, the axial length of the first protrusion 34 extending into the interior of the limiting sleeve 2 can be in the range of 0.65mm to 0.75mm. In some embodiments, in order to further ensure the stability of the connection and leave enough room for movement for the movable unit 1, the axial length of the first protrusion 34 extending into the interior of the limiting sleeve 2 can be in the range of 0.68mm to 0.72mm.

[0086] Fig. 10A This is a schematic diagram of the structure of the limiting sleeve 2 shown in some embodiments of this specification. Figure 1 ; Fig. 10B This is a schematic diagram of the structure of the limiting sleeve 2 shown in some embodiments of this specification. Figure 2 .

[0087] like Figure 5 , Fig. 6A , Figure 6B , Fig. 10A and Fig. 10B As shown, in some embodiments, the limiting sleeve 2 of the optical device includes a movable unit accommodating portion 22 and a lens mounting portion 23, the movable unit 1 is movably arranged in the movable unit accommodating portion 22, and at least one non-movable lens is installed in the lens mounting portion 23. In some embodiments, the movable unit accommodating portion 22 is located at the front end of the lens mounting portion 23, and the movable unit accommodating portion 22 and the lens mounting portion 23 can be an integrally formed structure, which is simple in structure and reduces the difficulty of assembly.

[0088] In some embodiments, the limiting sleeve 2 includes a first sleeve 24, a second sleeve 25 and a third sleeve 26 which are coaxially arranged. In some embodiments, the first sleeve 24 constitutes a limiting groove 21 for accommodating the movable lens holding frame 11, and the second sleeve 25 is located in the limiting groove 21; the movable lens holding frame 11 includes a receiving hole 111, and the movable lens 101 is arranged at the front end of the receiving hole 111, and the inner diameter of the rear end of the receiving hole 111 is greater than the outer diameter of the front end of the second sleeve 25. When the movable lens holding frame 11 moves backward to the rear end zoom position, the second sleeve 25 is at least partially located in the receiving hole 111. This arrangement can reduce the axial length of the optical device, making the structure more compact, and can also design the distance between the movable lens 101 and the adjacent non-movable lens to be the position where the imaging is clearest, thereby improving the imaging quality.

[0089] In some embodiments, the first sleeve 24 is sleeved on the outside of the second sleeve 25, and the two constitute the movable unit accommodating portion 22. The third sleeve 26 is arranged at the rear ends of the first sleeve 24 and the second sleeve 25, and the interiors of the second sleeve 25 and the third sleeve 26 constitute the lens mounting portion 23. In some embodiments, the radial dimension of the first sleeve 24 is greater than the radial dimension of the third sleeve 26, and the radial dimension of the third sleeve 26 is greater than the radial dimension of the second sleeve 25, so that it can ensure that the movable unit 1 has sufficient space for movement and the lens mounting portion 23 can be small in size.

[0090] In some embodiments, the lens mounting portion 23 is provided with at least one positioning groove 231, and the at least one positioning groove 231 is configured to mount at least one non-movable lens. In some embodiments, the positioning groove 231 can be a step, a groove or other positioning structure opened in the lens mounting portion 23.

[0091] In some embodiments, at least one spacer 232 is disposed in the lens mounting portion 23, and the at least one spacer 232 is configured to limit the axial displacement of at least one non-moving lens in the limiting sleeve 2. In some embodiments, the spacer 232 is detachably mounted in the lens mounting portion 23, for example, the outer circumference of the spacer 232 is slidably fitted with the inner wall of the limiting sleeve 2, so that the spacer 232 can be easily removed or installed, while maintaining the stability of the spacer 232.

[0092] In some embodiments, the number of the positioning grooves 231 and the spacers 232 of the lens mounting portion 23 can be set according to actual needs, for example, two positioning grooves 231 and two spacers 232 are set, or other numbers of positioning grooves 231 and spacers 232 are set. In some embodiments, the lens mounting portion 23 includes a second sleeve 25 and a third sleeve 26, and the non-movable lens includes a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, and a seventh lens 107. A first positioning groove 2311 is set at the front end of the second sleeve 25, and the first positioning groove 2311 is a step. The third lens 103 is positioned and installed at the first positioning groove 2311 and is located at the front end of the first positioning groove 2311. A second positioning groove 2312 is provided in the third sleeve 26, and the second positioning groove 2312 is a step. The fourth lens 104 is positioned at the second positioning groove 2312. The rear end of the fourth lens 104 is provided with a first spacer 2321, a fifth lens 105, a spacer 232, and a sixth lens 106 in sequence. The fourth lens 104 is positioned by the second positioning groove 2312, the fifth lens 105 is positioned by the first spacer 2321, and the sixth lens 106 is positioned by the spacer 232. A second positioning groove 2312 is provided at the rear end of the second sleeve 25, and the second positioning groove 2312 is a step. The seventh lens 107 is positioned at the second positioning groove 2312.

[0093] In some embodiments, a slot is formed at the rear end of the limiting sleeve 2 , and the slot is used to position and install the imaging assembly 108 .

[0094] According to the above scheme, the lens group and imaging assembly 108 of the optical device are positioned and installed by the limiting sleeve 2, which can ensure the positioning accuracy of multiple lenses, has a simple structure, reduces the dimensional error caused by the matching of multiple parts, and can improve the zoom stability and imaging quality of the lens. In addition, the limiting sleeve 2 can not only position the non-movable lens, but also position the movable lens 101, ensuring the accuracy between the movable lens 101 and the non-movable lens.

[0095] Fig.11A This is a schematic diagram of the structure of the first bracket 5 shown in some embodiments of this specification. Figure 1 ; Fig. 11B This is a schematic diagram of the structure of the first bracket 5 shown in some embodiments of this specification. Figure 2 .

[0096] like Figure 5 , Fig. 6A , Figure 6B , Fig.11A and Fig. 11B As shown, in some embodiments, the optical device includes a first bracket 5, which is a cylindrical bracket and is disposed on the outer peripheral side of the limiting sleeve 2. In some embodiments, the first bracket 5 is configured to fix the limiting sleeve 2 and the front lens holding frame 3. In some embodiments, the first bracket 5 includes a large diameter portion 51 and a small diameter portion 52, the large diameter portion 51 is sleeved on the outside of the first sleeve 24, and the small diameter portion 52 is sleeved on the outside of the lens mounting portion 23.

[0097] In some embodiments, the inner diameter of the large diameter portion 51 is larger than the outer diameter of the first sleeve 24, that is, there is a spacing space between the large diameter portion 51 and the first sleeve 24, and the spacing space constitutes a coil accommodating chamber, and the coil 41 is wound in the coil accommodating chamber. In some embodiments, the front lens holding frame 3 includes a second protrusion 35, and the second protrusion 35 at least partially extends between the large diameter portion 51 and the first sleeve 24, and is used to limit the front end of the coil 41. In some embodiments, a shoulder 53 is formed at the connection between the large diameter portion 51 and the small diameter portion 52, and the shoulder 53 is used to limit the rear end of the coil 41. The coil 41 can be fixed in the optical device by the first bracket 5, the limiting sleeve 2 and the front lens holding frame 3, which is easy to install and has high stability.

[0098] In some embodiments, the inner diameter of the small diameter portion 52 is equal to the outer diameter of the lens mounting portion 23 , so that the first bracket 5 and the limiting sleeve 2 remain connected.

[0099] Fig.12It is a schematic diagram of the structure of the second bracket 6 shown in some embodiments of this specification.

[0100] like Figure 5 , Fig. 6A , Figure 6B , Fig.12 As shown, in some embodiments, the optical device includes a second bracket 6, which is a cylindrical bracket, and the second bracket 6 is sleeved on the outside of the small diameter portion 52. In some embodiments, the first bracket 5 is provided with a first matching portion 54, and the second bracket 6 is provided with a second matching portion 61. After the first matching portion 54 and the second matching portion 61 are matched, the first bracket 5 and the second bracket 6 are fixed.

[0101] In some embodiments, the first matching portion 54 is disposed at the connection between the large diameter portion 51 and the small diameter portion 52 of the first bracket 5, and the first matching portion 54 is located outside the first bracket 5. In some embodiments, the first matching portion 54 includes but is not limited to a card slot, a card protrusion, and the like.

[0102] In some embodiments, the second matching portion 61 is disposed at the front end of the second bracket 6. In some embodiments, the second matching portion 61 includes but is not limited to a card slot, a card protrusion, and the like.

[0103] In some embodiments, the first matching portion 54 is configured as an annular groove, and the second matching portion 61 is configured as an annular protrusion. The groove and the protrusion cooperate to connect the first bracket 5 and the second bracket 6.

[0104] In some embodiments, the inner diameter of the second bracket 6 is larger than the outer diameter of the small diameter portion 52, and the gap between the two constitutes a wiring space, and the wiring space is used to accommodate the lead wire. In some embodiments, the front end of the second bracket 6 includes a convex portion 62, which protrudes radially inward, and the convex portion 62 can be annular or convex points arranged at intervals along the circumferential direction. The second bracket 6 is matched with the lens mounting portion 23 of the first bracket 5 through the convex portion 62. The convex portion 62 can form a wiring space between the inner wall of the second bracket 6 and the outer wall of the first bracket 5, and can keep the first bracket 5 and the second bracket 6 coaxially arranged.

[0105] In some embodiments, the first matching portion 54 of the first bracket 5 is formed with at least one wiring hole 55, and the wiring hole 55 connects the coil accommodating compartment and the wiring space, so that the lead wire of the coil 41 can enter the wiring space through the wiring hole 55. In some embodiments, the number of the wiring holes 55 can be two, three, or four, etc.

[0106] Fig.13 It is a schematic diagram of the structure of the second bracket 6 shown in some embodiments of this specification.

[0107] like Figure 5 , Fig. 6A , Figure 6B , Fig.13 As shown, in some embodiments, the optical device includes a third bracket 7, which is disposed at the rear end of the movable unit 1, and is configured to accommodate an imaging component 108, which includes but is not limited to a complementary metal oxide semiconductor (CMOS) and a printed circuit board (PCB). In some embodiments, the third bracket 7 is connected to the rear end of the first bracket 5 and is also connected to the rear end of the second bracket 6.

[0108] In some embodiments, the rear end of the second bracket 6 is provided with a third matching portion 63, and the front end of the third bracket 7 is provided with a fourth matching portion 71, and the third matching portion 63 and the fourth matching portion 71 are matched to connect the third bracket 7 and the second bracket 6. In some embodiments, the third matching portion 63 can be a square groove, and the third bracket 7 is a rectangular frame, and the rectangular frame is clamped in the square groove.

[0109] In some embodiments, the third bracket 7 includes a hole 72, and the imaging assembly 108 is accommodated in the hole 72 of the third bracket 7. In some embodiments, the third bracket 7 also includes at least one wire groove 73, and the wire groove 73 is used to accommodate the lead wire of the coil 41. The lead wire of the coil 41 is led out from the wiring space of the second bracket 6 and enters the third bracket 7, and is arranged in the wire groove 73 of the third bracket 7 and led out.

[0110] Fig.14 It is a cross-sectional view of an optical device shown in some other embodiments of the present specification.

[0111] like Fig.14 As shown, in some embodiments, the movable unit 1 is located at the end of the axial direction of the coil 41, so that the movable unit 1 obtains driving force and realizes fast zooming. Figure 8 The movable unit 1 is axially directed toward the adjacent Figure 8 The end point in the B direction is located at the end of the coil 41, which means that the movable unit 1 is axially directed toward the adjacent Figure 8 The end point in the B direction is axially directed toward the coil 41. Figure 8 Align the endpoints in the T direction.

[0112] Compared to Figures 5 to 13 Describe the optical device in the embodiment, Fig.14In the illustrated embodiment, the axial length of the first sleeve 24 of the limiting sleeve 2 is increased, the axial length of the large diameter portion 51 of the first bracket 5 is increased, and the axial protrusion size of the second protrusion 35 of the front end lens retaining frame is increased, so that the coil accommodating compartment is located behind the movable unit 1, and the coil 41 is arranged in the coil accommodating compartment and is configured to provide driving force to the movable unit 1.

[0113] In some embodiments, when the movable unit 1 is in the initial position, the rear end of the movable unit 1 is aligned with the front end of the coil 41. When a forward current or a reverse current is passed through the coil 41, a magnetic field is generated inside the coil 41, and the first annular magnet 12 and the second annular magnet 13 move forward or backward under the driving force of the magnetic field. In some embodiments, when the movable unit 1 is in the initial position, the rear end of the movable unit 1 at least partially overlaps with the front end of the coil 41 in the axial direction. In some embodiments, when the movable unit 1 is in the initial position, the rear end of the movable unit 1 and the front end of the coil 41 are spaced apart by a preset distance in the axial direction.

[0114] Fig.15 It is a schematic diagram of the structure of an optical device according to some embodiments of the present specification.

[0115] In some embodiments, the optical device further comprises an elastic member 8, which is disposed between the movable unit 1 and the limiting groove 21 of the limiting sleeve 2, and the elastic member 8 is configured to provide an axial driving force to the movable unit 1. In some embodiments, when the elastic member 8 is in a natural state, the front end of the movable unit 1 abuts against the rear end of the front lens holding frame 3, and the elastic member 8 can limit the movable unit 1 to prevent the movable unit 1 from accidentally sliding in the limiting groove 21. When the coil 41 is energized, the movable unit 1 moves backward, and the elastic member 8 is compressed at this time. When the coil 41 is continuously energized, the driving force of the coil 41 on the movable unit 1 is equal to the elastic restoring force of the elastic member 8, and the zooming of the movable unit 1 is completed. When the coil 41 is de-energized, the driving force of the coil 41 on the movable unit 1 disappears, and the movable unit 1 returns to the initial position under the action of the elastic restoring force of the elastic member 8, preventing the movable unit 1 from getting stuck when resetting.

[0116] In some embodiments, the elastic member 8 includes but is not limited to a spring, an elastic washer, and the like.

[0117] Some embodiments of the present specification also provide an endoscope, which includes the optical device as described above. The endoscope is zoomed by a movable unit 1, has a simple structure, reduces assembly errors caused by multiple parts, and the movable unit 1 is arranged to move in a limiting sleeve 2, with high positioning accuracy, so the imaging quality of the endoscope is high.

[0118] The beneficial effects that may be brought about by the embodiments of the present application include but are not limited to:

[0119] (1) The first annular magnet and the second annular magnet are configured to drive the movable lens to achieve zooming, and the structure is simple, which is conducive to the small size of the movable unit. The polarities of the two magnetic poles facing each other of the first annular magnet and the second annular magnet are opposite, so that the two magnets are retained in the movable lens retaining frame by mutual attraction, and there is no need to fix the two magnets by gluing, welding, etc., which reduces the difficulty of assembly;

[0120] (2) The outer shell of the movable lens holding frame has a certain width, which can enable the movable lens holding frame to maintain stability during the sliding process;

[0121] (3) The lens group and imaging assembly of the optical device are positioned and installed by the limiting sleeve, which can ensure the positioning accuracy of multiple lenses, has a simple structure, reduces the dimensional error caused by the matching of multiple parts, and can improve the zoom stability and imaging quality of the lens. In addition, the lens installation part of the limiting sleeve can not only position the non-movable lens, but also position the movable lens through the movable lens holding frame, thereby ensuring the accuracy between the movable lens and the non-movable lens;

[0122] (4) An elastic member is provided at the rear end of the movable unit, and the elastic member can limit the movable unit to prevent the movable unit from accidentally sliding in the limiting groove. When the magnetic field generated by the coil drives the movable unit to move to the focusing position, the coil is powered off, and the elastic member provides an axial driving force to the movable unit to reset the movable unit to the initial position;

[0123] (5) The movable unit is located at the end of the coil axis, so that the movable unit obtains a larger driving force and realizes fast zooming.

[0124] It should be noted that different embodiments may produce different beneficial effects. In different embodiments, the beneficial effects that may be produced may be any one or a combination of the above, or any other beneficial effects that may be obtained.

[0125] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of this specification. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and corrections to this specification. Such modifications, improvements and corrections are suggested in this specification, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of this specification.

[0126] At the same time, this specification uses specific words to describe the embodiments of this specification. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of this specification. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of this specification can be appropriately combined.

[0127] Similarly, it should be noted that in order to simplify the description disclosed in this specification and thus help understand one or more embodiments, in the above description of the embodiments of this specification, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the subject matter of this specification are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0128] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of this specification are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0129] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, as an example and not a limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly introduced and described in this specification.

Claims

1. An optical device, characterized in that: include: a body configured to house a non-moving lens; A movable lens holding frame, configured to accommodate a movable lens, the movable lens holding frame being movably matched with the main body along the optical axis direction of the movable lens; An annular magnet is mounted on the movable lens holding frame, and the magnetic poles at both ends of the annular magnet are arranged along the optical axis direction of the movable lens; A driving member is mounted on the main body and is located outside the annular magnet. The driving member is configured to drive the annular magnet to move along the optical axis direction of the movable lens, thereby changing the focal length between the movable lens and the non-movable lens.

2. The optical device according to claim 1, characterized in that The annular magnet comprises a first annular magnet and a second annular magnet, wherein the polarities of two magnetic poles facing each other of the first annular magnet and the second annular magnet are opposite; The movable lens holding frame is provided with two annular grooves along the optical axis direction of the movable lens, and the first annular magnet and the second annular magnet are respectively installed in the two annular grooves.

3. The optical device according to claim 2, characterized in that The distance between the first annular magnet and the second annular magnet ranges from 0.05 mm to 0.15 mm.

4. The optical device according to claim 1, wherein The movable lens holding frame and the annular magnet are both made of magnetic materials, and the movable lens holding frame and the annular magnet are integrally formed.

5. The optical device according to claim 1, wherein: The movable lens holding frame includes an outer shell and an inner shell, the outer shell has a first width along the axial direction, the inner shell has a second width along the axial direction, and the first width is smaller than the second width.

6. The optical device according to claim 5, characterized in that The ratio of the first width to the second width ranges from 0.55 to 0.

98.

7. The optical device according to claim 5, characterized in that The annular magnet is installed between the outer shell and the inner shell, and has a third width along the axial direction of the inner shell, the third width is greater than or equal to the first width, and the third width is less than or equal to the second width.

8. The optical device according to claim 1, wherein: The driving member includes a coil wound on the outside of the main body, and the coil is configured to apply a driving force along the optical axis direction of the movable lens to the annular magnet after being energized, so that the movable lens holding frame moves between an initial position and a zoom position; The movable lens holding frame is located in the middle of the coil in the axial direction; or, the movable lens holding frame is located at the end of the coil in the axial direction.

9. The optical device according to claim 1, wherein: The main body includes a limiting sleeve, the limiting sleeve includes a limiting groove, the movable lens holding frame is installed in the limiting groove, and the limiting groove is configured to limit the radial displacement of the movable lens holding frame and is configured to limit the axial travel range of the movable lens holding frame.

10. The optical device according to claim 9, characterized in that The limiting sleeve comprises a lens mounting portion, the lens mounting portion is provided with at least one positioning groove, and the at least one positioning groove is configured to mount at least one non-movable lens.

11. The optical device according to claim 9, characterized in that The limiting sleeve includes a second sleeve, and the second sleeve is located in the limiting groove; The movable lens holding frame comprises a receiving hole, the movable lens is arranged at the front end of the receiving hole, and the inner diameter of the rear end of the receiving hole is greater than the outer diameter of the front end of the second sleeve.

12. The optical device according to claim 10, characterized in that At least one spacer is disposed in the lens mounting portion, and the at least one spacer is configured to limit the displacement of the at least one non-movable lens in the axial direction of the limiting sleeve.

13. The optical device according to claim 1, wherein: The optical device includes a front lens holding frame and a front lens group. The front lens holding frame is arranged at the front end of the movable unit, and the front lens holding frame is configured to install the front lens group.

14. The optical device according to claim 9, characterized in that The optical device comprises a first bracket, which is a cylindrical bracket and is arranged on the outer peripheral side of the limiting sleeve.

15. The optical device according to claim 14, characterized in that The first bracket includes a large diameter portion, and a coil accommodating compartment is provided inside the large diameter portion.

16. The optical device according to claim 15, characterized in that The optical device includes a second bracket, the first bracket also includes a small-diameter portion, the second bracket is a cylindrical bracket, and the second bracket is sleeved on the outside of the small-diameter portion.

17. The optical device according to claim 14, characterized in that The optical device comprises a third bracket, which is arranged at the rear end of the first bracket and is configured to accommodate an imaging component.

18. An endoscope, characterized in that: The endoscope comprises an optical device as claimed in claims 11-17.

Images