Automatic focusing camera of endoscope and endoscope
By placing the focusing lens group behind the zoom lens group and optimizing the center of gravity distribution of the endoscope autofocus camera with a specific mechanical structure, the problem of unstable holding caused by the forward center of gravity is solved, resulting in a better user experience and imaging effect.
Patent Information
- Application Number
- CN202423080040.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-12
AI Technical Summary
The current autofocus cameras have a forward center of gravity, which makes them unstable to hold and affects the user experience.
The focusing lens group is positioned behind the zoom lens group, and the drive component is located in the middle or rear of the handle. The design of the reversible motor, transmission gears and driven components enables autofocus, and the center of gravity distribution is optimized through the cooperation of the beam splitter assembly and the lens barrel.
It effectively prevents hand imbalance, improves user grip stability, enhances autofocus accuracy and efficiency, reduces lens length, and improves image quality.
Smart Images
Figure CN223679436U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of endoscopes, in particular to an endoscope automatic focusing camera and an endoscope. BACKGROUND
[0002] An optical endoscope comprises a mirror rod and a camera. The mirror rod is internally provided with an objective lens, a cylindrical lens group and an ocular lens. The mirror rod is used for insertion into a target area and is responsible for image acquisition. The end of the mirror rod close to the ocular lens is connected to the camera, which converts the image collected by the mirror rod into an electronic signal and transmits it to an external display device through a data line.
[0003] There are two different types of cameras on the market: automatic focusing cameras and manual focusing cameras. Automatic focusing cameras use algorithms to detect the focal point of the target object in real time and dynamically adjust the position of the lens to achieve automatic focusing. Since the focusing process is automatic and continuous, users do not need to manually intervene, which greatly reduces the user's operation burden and significantly improves work efficiency.
[0004] In order to achieve automatic focusing, an additional driving assembly for driving the movement of related lenses is provided in the automatic focusing camera, which includes a motor. In the automatic focusing camera, most parts can be made of materials with smaller density to make them lighter, however, the driving assembly cannot be made very light due to the structural characteristics of the motor. In the commonly seen automatic focusing cameras on the market, the objective lens, the focusing lens group and the zoom lens group are arranged in sequence along the axial direction of the lens barrel, and the focusing lens group is located at the front. Correspondingly, in order to facilitate connection with the focusing lens group, the driving assembly is also located at the front, which results in that the center of gravity of the entire automatic focusing camera is relatively forward, and when the user holds the camera, the user may experience an unbalanced holding condition, which is not conducive to the user's stable holding of the camera. Practical new type content
[0005] Therefore, it is necessary to provide an endoscope automatic focusing camera and an endoscope to solve the above problems. The center of gravity of the endoscope automatic focusing camera is relatively rearward, which is conducive to the user's stable holding of the camera.
[0006] In order to solve the above problems, the present application provides the following technical solutions:
[0007] An endoscope automatic focusing camera, comprising:
[0008] a lens barrel;
[0009] a handle fixedly sleeved on the lens barrel;
[0010] an objective lens arranged in the lens barrel;
[0011] a zoom lens group arranged in the lens barrel;
[0012] a focusing lens group arranged in the lens barrel, the objective lens, the zoom lens group and the focusing lens group being arranged in sequence from front to back;
[0013] a diaphragm arranged in front of the focusing lens group; and
[0014] a driving assembly connected to the focusing lens group to drive the focusing lens group to move back and forth, the driving assembly being located at the rear of the zoom lens group and at the middle or rear of the handle.
[0015] The endoscope automatic focusing camera has at least the following beneficial effects:
[0016] In the endoscope automatic focusing camera, the focusing lens group is arranged at the rear of the zoom lens group, which enables the driving assembly to be arranged at the middle or rear of the handle, thereby moving the center of gravity of the entire endoscope automatic focusing camera to the rear, which is beneficial to prevent the user from holding the camera unsteadily and is beneficial to the user to hold the camera stably.
[0017] In one embodiment, the driving assembly comprises a reversible motor, a transmission gear and a driven part, the reversible motor has a rotating shaft, the transmission gear is fixedly arranged on the rotating shaft and coaxially arranged with the rotating shaft; the driven part comprises a driven gear and a connecting part, the driven gear is engaged with the transmission gear, the connecting part is fixedly connected to the end surface of the driven gear and rotationally connected to the lens barrel, the rotation axis of the connecting part relative to the lens barrel is collinear with the axis of the driven gear; the focusing lens group comprises a focusing lens and a first force receiving part, the first force receiving part is fixedly connected to the focusing lens; the lens barrel is provided with a first guide hole, the first guide hole extends linearly along the axial direction of the focusing lens, the width of the first guide hole is adapted to the size of the first force receiving part, the connecting part is provided with a first force applying hole, the first force applying hole extends helically along the axial direction of the focusing lens, and the first force receiving part is sequentially arranged in the first guide hole and the first force applying hole.
[0018] In this way, when the rotating shaft rotates, the transmission gear and the driven gear rotate, the connecting part rotates, the side wall of the first force applying hole pushes the first force receiving part to move along the first guide hole, thereby enabling the focusing lens to move linearly along its own axial direction, and thus the automatic focusing is realized by using the driving assembly.
[0019] In one embodiment, the number of teeth of the transmission gear is less than the number of teeth of the driven gear.
[0020] In this way, on the one hand, the radial size of the transmission gear is reduced, so that the endoscope automatic focusing camera is relatively thin, and the user can hold the camera stably; on the other hand, the rotation speed of the driven gear is reduced, and the moving speed of the focusing lens is slow when the shaft rotates, which is beneficial to accurately adjust the position of the focusing lens, thereby improving the accuracy of automatic focusing and obtaining good automatic focusing effect.
[0021] In one of the embodiments, the width of the first force applying hole is adapted to the size of the first force receiving member.
[0022] In this way, during the forward and reverse rotation of the shaft, the opposite two side walls of the first force applying hole can quickly apply force to the first force receiving member, thereby improving the automatic focusing efficiency.
[0023] In one of the embodiments, the lens barrel comprises a large diameter part and a small diameter part, the large diameter part and the small diameter part are coaxially arranged, the endoscope automatic focusing camera further comprises a light splitting prism assembly, the light splitting prism assembly is arranged opposite to the end surface of the large diameter part, the large diameter part, the small diameter part and the light splitting prism assembly jointly enclose a limiting space, the driven member is sleeved on the small diameter part and located in the limiting space, and the axial dimension of the driven member along the focusing lens group is adapted to the axial dimension of the limiting space along the focusing lens group.
[0024] In this way, the axial position of the driven member is limited, so that the connecting part can stably rotate relative to the lens barrel. Moreover, the limiting space is jointly enclosed by the lens barrel and the light splitting prism assembly, instead of being separately formed on the lens barrel, which is beneficial to reduce the axial size of the lens barrel, thereby reducing the length of the endoscope automatic focusing camera, and facilitating the user to hold the camera.
[0025] In one of the embodiments, the endoscope automatic focusing camera further comprises a light splitting prism assembly, the light splitting prism assembly is located behind the focusing lens group, and the light splitting prism assembly is located in the handle and arranged side by side with the driving assembly along the up-down direction.
[0026] In this way, the light splitting prism assembly is relatively heavy, and the light splitting prism assembly and the driving assembly are arranged side by side along the up-down direction, which is beneficial to move the center of gravity of the entire endoscope automatic focusing camera backward, prevent the user from holding the camera unbalanced, and hold the camera stably.
[0027] In one of the embodiments, the focusing lens group is located at the rear of the lens barrel, and the driving assembly is located behind the lens barrel.
[0028] In this way, the driving assembly and the lens barrel do not overlap in the axial direction of the lens barrel, so that the local area of the endoscope automatic focusing camera is not too thick, and the user can hold the endoscope automatic focusing camera more easily.
[0029] In one of the embodiments, the objective lens is located outside the handle, and the zoom lens group is located outside the handle on the side away from the focusing lens group.
[0030] In this way, on the one hand, the user can manually zoom; on the other hand, the length of the handle is reduced, which helps to move the center of gravity of the endoscope automatic focusing camera backward, helps to prevent the user from holding the camera unbalanced, and helps the user to hold the camera stably.
[0031] In one of the embodiments, the objective lens, the zoom lens group, the diaphragm and the focusing lens group are sequentially arranged along the length direction of the handle.
[0032] In this way, the diaphragm can effectively limit the range of light beams entering the focusing lens group, reduce stray light and aberration, and thus improve the contrast and clarity of the image.
[0033] The application also provides an endoscope comprising the endoscope automatic focusing camera.
[0034] The endoscope automatic focusing camera has at least the following beneficial effects:
[0035] In the endoscope, the focusing lens group is arranged behind the zoom lens group, which makes the driving assembly arranged in the middle or rear part of the handle, so that the center of gravity of the entire endoscope automatic focusing camera is moved backward, which helps to prevent the user from holding the camera unbalanced, and helps the user to hold the camera stably. BRIEF DESCRIPTION OF DRAWINGS
[0036] Figure 1 A perspective view of the endoscope automatic focusing camera according to one of the embodiments of the application;
[0037] Figure 2 A perspective view of the endoscope automatic focusing camera according to one of the embodiments of the application; Figure 1 A longitudinal sectional view of the endoscope automatic focusing camera shown in FIG. 1;
[0038] Figure 3 A longitudinal sectional view of the endoscope automatic focusing camera shown in FIG. 1; Figure 2 An enlarged view of position A in FIG. 1;
[0039] Figure 4 An enlarged view of position A in FIG. 1; Figure 1 A transverse sectional view of the endoscope automatic focusing camera shown in FIG. 1;
[0040] Figure 5 A transverse sectional view of the endoscope automatic focusing camera shown in FIG. 1; Figure 1Fig. 1 is a schematic view of the relationship between the positions of some structures in an endoscope automatic focusing camera;
[0041] Figure 6 Fig. 2 is a schematic view of the relationship between the positions of some structures in an endoscope automatic focusing camera; Figure 1 Fig. 3 is a schematic view of the relationship between the positions of some structures in an endoscope automatic focusing camera;
[0042] Figure 7 Fig. 4 is a schematic view of the relationship between the positions of some structures in an endoscope automatic focusing camera; Figure 6 Fig. 5 is a schematic view of the relationship between the positions of some structures in an endoscope automatic focusing camera;
[0043] Figure 8 Fig. 6 is a schematic view of the relationship between the positions of some structures in an endoscope automatic focusing camera. Figure 6
[0044] Reference signs:
[0045] 1, lens barrel; 11, first guide hole; 12, second guide hole; 14, large diameter portion; 15, small diameter portion; 2, handle; 3, objective lens; 4, zoom lens group; 41, first zoom lens; 42, second zoom lens; 43, second force receiving member; 44, third force receiving member; 45, force applying member; 451, second force applying hole; 4511, first end; 4512, second end; 452, third force applying hole; 46, zooming hand wheel; 5, focusing lens group; 51, focusing lens; 52, first force receiving member; 6, diaphragm; 7, driving assembly; 71, reversible motor; 711, rotating shaft; 72, transmission gear; 73, driven member; 731, driven gear; 732, connecting portion; 7321, first force applying hole; 8, prism assembly. DETAILED DESCRIPTION
[0046] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the scope of the present application, and it is understood that similar modifications of the present application can be effected by persons of ordinary skill in the art. The present application is therefore not limited to the embodiments disclosed below.
[0047] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0048] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and are not used to denote or imply relative importance or a number of indications of the technical features indicated. Thus, the technical features defined with "first", "second" can explicitly or implicitly include at least one of the technical features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.
[0049] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0050] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the first feature is lower than the second feature in horizontal height.
[0051] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes, and do not represent the only implementation.
[0052] Reference Figures 1 to 8The present application provides an endoscope automatic focusing camera, which comprises a lens barrel 1, a handle 2, an objective lens 3, a zoom lens group 4, a focusing lens group 5, a diaphragm 6 and a driving assembly 7. The handle 2 is fixedly sleeved on the lens barrel 1, and the handle 2 is held by a user. Generally, when the user holds the camera, the palm, the ring finger and the little finger of the user wrap the rear part of the handle 2, the middle finger supports the bottom side of the middle part of the handle 2, the index finger supports the bottom side of the front part of the handle 2, and the thumb presses the top side of the handle 2. The objective lens 3, the zoom lens group 4 and the focusing lens group 5 are arranged in the lens barrel 1 in sequence from front to back. The diaphragm 6 is arranged in front of the focusing lens group 5. The driving assembly 7 is connected to the focusing lens group 5 to drive the focusing lens group 5 to move forward and backward, and the driving assembly 7 is located behind the zoom lens group 4 and in the middle part or the rear part of the handle 2.
[0053] In the endoscope automatic focusing camera, the focusing lens group 5 is arranged behind the zoom lens group 4, so that the driving assembly 7 can be arranged in the middle part or the rear part of the handle 2, thereby moving the center of gravity of the whole endoscope automatic focusing camera backward, which is beneficial to prevent the user from holding the camera unsteadily.
[0054] It should be noted that the front-rear direction of the endoscope automatic focusing camera corresponds to the left-right direction in Figure 2 and Figure 5 . Specifically, the forward direction of the endoscope automatic focusing camera corresponds to the left direction in Figure 2 and Figure 5 , and the rearward direction of the endoscope automatic focusing camera corresponds to the right direction in Figure 2 and Figure 5 .
[0055] Referring to Figures 2 to 4 , the driving assembly 7 comprises a reversible motor 71, a transmission gear 72 and a driven part 73. The reversible motor 71 has a rotating shaft 711 capable of outputting forward and reverse rotation, and the rotating shaft 711 outputs rotation in one direction when the reversible motor 71 rotates forward, and outputs rotation in another direction when the reversible motor 71 reverses. The transmission gear 72 is fixedly arranged on the rotating shaft 711 and coaxially arranged with the rotating shaft 711. Referring to Figure 7The driven member 73 comprises a driven gear 731 and a connecting part 732, the driven gear 731 is engaged with the transmission gear 72, the connecting part 732 is fixedly connected to the end face of the driven gear 731 and is rotationally connected to the lens barrel 1, the rotation axis of the connecting part 732 relative to the lens barrel 1 is collinear with the axis of the driven gear 731; the focusing lens group 5 comprises a focusing lens 51 and a first force receiving member 52, the first force receiving member 52 is fixedly connected to the focusing lens 51; the lens barrel 1 is provided with a first guide hole 11, the first guide hole 11 extends linearly along the axial direction of the focusing lens 51, the width of the first guide hole 11 is adapted to the size of the first force receiving member 52, the connecting part 732 is provided with a first force applying hole 7321, the first force applying hole 7321 extends helically along the axial direction of the focusing lens 51, and the first force receiving member 52 is sequentially arranged in the first guide hole 11 and the first force applying hole 7321. In this way, when the rotating shaft 711 rotates, the transmission gear 72 and the driven gear 731 rotate accordingly, the connecting part 732 rotates, the side wall of the first force applying hole 7321 pushes the first force receiving member 52 to move along the first guide hole 11, so that the focusing lens 51 moves linearly along its own axial direction, and thus the automatic focusing is realized by using the driving assembly 7.
[0056] Preferably, the connecting part 732 is integrally formed with the driven gear 731. In other embodiments, the connecting part 732 is welded to the driven gear 731.
[0057] Preferably, the first force receiving member 52, the first guide hole 11 and the first force applying hole 7321 are each provided with two, each first force receiving member 52 corresponds to one first guide hole 11 and one first force applying hole 7321, and the two first force receiving members 52 are symmetrically arranged about the axis of the focusing lens 51.
[0058] In some embodiments, the first force receiving member 52, the first guide hole 11 and the first force applying hole 7321 are each provided with at least three, each first force receiving member 52 corresponds to one first guide hole 11 and one first force applying hole 7321, and each first force receiving member 52 is uniformly distributed along the circumferential direction of the focusing lens 51.
[0059] In some embodiments, the first force receiving member 52, the first guide hole 11 and the first force applying hole 7321 can also be provided with only one.
[0060] Referring to Figure 4 , the number of teeth of the transmission gear 72 is less than the number of teeth of the driven gear 731. On the one hand, this is conducive to reducing the radial size of the transmission gear 72, so that the overall endoscope automatic focusing camera is relatively thin, which is conducive to the user's stable holding of the camera; on the other hand, this is conducive to reducing the rotating speed of the driven gear 731, when the rotating shaft 711 rotates, the moving speed of the focusing lens 51 is slower, which is conducive to accurately adjusting the position of the focusing lens 51, thereby improving the accuracy of automatic focusing and obtaining good automatic focusing effect.
[0061] Preferably, the number of teeth of the transmission gear 72 is z1, and the number of teeth of the driven gear 731 is z2, z2≥5z1. This can significantly reduce the radial dimension of the transmission gear 72, so that the endoscope automatic focusing camera is relatively thin as a whole, which is conducive to the user to hold the camera stably. Moreover, this can significantly reduce the rotation of the driven gear 731, which is conducive to accurately adjusting the position of the focusing lens 51, thereby improving the accuracy of automatic focusing and obtaining good automatic focusing effect.
[0062] Referring to Figure 6 The width of the first force applying hole 7321 is adapted to the size of the first force receiving member 52. In this way, during the forward and reverse rotation of the rotating shaft 711, the two opposite side walls of the first force applying hole 7321 can quickly apply force to the first force receiving member 52, which is conducive to improving the automatic focusing efficiency. Specifically, the two sides of the first force applying hole 7321 in the width direction have only a very small gap with the first force receiving member 52. Exemplarily, the first force receiving member 52 is a cylinder, the diameter of the first force receiving member 52 is D, and the width of the first force applying hole 7321 is W, W-D≤0.2mm.
[0063] In some embodiments, the transmission gear 72 and the driven gear 731 can not be provided, and the rotating shaft 711 and the connecting part 732 can be rotated through a transmission belt (for example, a belt, a synchronous belt) or a worm gear. When the rotating shaft 711 rotates, the connecting part 732 rotates, and at the same time, the connecting part 732 moves the first force receiving member 52 and the focusing lens 51 back and forth.
[0064] In some embodiments, the driven member 73 can not be provided, and a rack can be fixed on the first force receiving member 52, the length direction of the rack is consistent with the axial direction of the focusing lens 51, and the rack is engaged with the transmission gear 72, in other words, the rotating shaft 711 and the first force receiving member 52 are driven through a gear and a rack. When the rotating shaft 711 rotates, the first force receiving member 52 and the focusing lens 51 move back and forth.
[0065] In some embodiments, the driven member 73 and the transmission gear 72 can not be provided, and a linear motor can be used to replace the reversible motor 71, and the first force receiving member 52 is fixed to the output shaft of the linear motor, and the length direction of the output shaft of the linear motor is consistent with the axial direction of the focusing lens 51. When the output shaft of the linear motor moves back and forth, the first force receiving member 52 and the focusing lens 51 move back and forth.
[0066] Referring to Figure 3The lens barrel 1 comprises a large-diameter portion 14 and a small-diameter portion 15, which are coaxially arranged. The end face of the large-diameter portion 14 is opposite to the light-splitting prism assembly 8. The large-diameter portion 14, the small-diameter portion 15 and the light-splitting prism assembly 8 jointly enclose a limiting space. The driven member 73 is sleeved on the small-diameter portion 15 and located in the limiting space. The axial dimension of the driven member 73 along the focusing lens group 5 is adapted to the axial dimension of the limiting space along the focusing lens group 5. This achieves the axial limitation of the driven member 73, so that the connecting portion 732 can stably rotate relative to the lens barrel 1. Moreover, the limiting space is jointly enclosed by the lens barrel 1 and the light-splitting prism assembly 8, instead of being separately formed on the lens barrel 1, which is conducive to reducing the axial dimension of the lens barrel 1, thereby reducing the length of the automatic focusing camera head of the endoscope, and facilitating the user to hold the camera head.
[0067] Referring to Figure 2 and Figure 3 , the automatic focusing camera head of the endoscope further comprises a light-splitting prism assembly 8, which is located behind the focusing lens group 5 and is arranged side by side with the driving assembly 7 in the up-down direction in the handle 2, in other words, the light-splitting prism assembly 8 is also located in the middle or rear part of the handle 2. The light-splitting prism assembly 8 is relatively heavy, and the light-splitting prism assembly 8 is arranged side by side with the driving assembly 7 in the up-down direction, which is conducive to moving the center of gravity of the entire automatic focusing camera head rearward, preventing the user from holding the camera head unbalanced, and facilitating the user to stably hold the camera head.
[0068] Compared with the light-splitting prism assembly 8, the reversible motor 71 has a greater density. Referring to Figure 2 and Figure 3 , the reversible motor 71 is located below the light-splitting prism assembly 8. This is conducive to moving the center of gravity of the entire automatic focusing camera head downward, preventing the user from holding the camera head unbalanced, and facilitating the user to stably hold the camera head. Of course, in other embodiments, the reversible motor 71 can also be located above the light-splitting prism assembly 8.
[0069] It is worth mentioning that in the common autofocus camera on the market, the objective lens, the focusing lens group and the zoom lens group are arranged along the axis of the lens barrel in sequence, that is, the focusing lens group is arranged between the objective lens and the zoom lens group. In this case, the driving assembly and the lens barrel overlap in the axial direction of the lens barrel, in other words, in the space range along the radial direction of the lens barrel, there is both the lens barrel and the driving assembly, which makes the local area of the autofocus camera relatively thick and inconvenient for the user to hold. In the present application, the objective lens 3, the zoom lens group 4 and the focusing lens group 5 are arranged in sequence from front to back, that is, the focusing lens group 5 is located behind the zoom lens group 4. In this way, the focusing lens group 5 can be arranged at the rear of the lens barrel, and the driving assembly 7 can be arranged behind the lens barrel, so that the driving assembly 7 and the lens barrel 1 do not overlap in the axial direction of the lens barrel, which can avoid the local area of the endoscope autofocus camera being too thick and facilitate the user to hold.
[0070] Preferably, referring to Figure 2 , the focusing lens group 5 is located at the rear of the lens barrel 1, and the driving assembly 7 is located behind the lens barrel 1. In this way, the driving assembly 7 and the lens barrel 1 do not overlap in the axial direction of the lens barrel, which can avoid the local area of the endoscope autofocus camera being too thick and facilitate the user to hold.
[0071] Referring to Figure 2 , the objective lens 3 is located outside the handle 2, and the side of the zoom lens group 4 away from the focusing lens group 5 is located outside the handle 2. On the one hand, this facilitates the user to manually zoom; on the other hand, this reduces the length of the handle 2, which is conducive to moving the center of gravity of the endoscope autofocus camera backward, which is conducive to preventing the user from holding the camera unbalanced and facilitating the user to stably hold the camera. In other embodiments, in the case of smaller material density of the handle 2, the objective lens 3 can also be located inside the handle 2, and the side of the zoom lens group 4 away from the focusing lens group 5 can also be located inside the handle 2.
[0072] Referring to Figure 1 and Figure 5 , the objective lens 3, the zoom lens group 4, the diaphragm 6 and the focusing lens group 5 are arranged in sequence along the length direction of the handle 2. In this way, the diaphragm 6 can effectively limit the range of light beams entering the focusing lens group 5, reduce stray light and aberration, and thus improve the contrast and clarity of imaging. In other embodiments, the objective lens 3, the diaphragm 6, the zoom lens group 4 and the focusing lens group 5 are arranged in sequence along the length direction of the handle 2.
[0073] Referring to Figure 2 , Figure 5 , Figure 6 and Figure 8The zoom lens group 4 comprises a first zoom lens 41, a second zoom lens 42, a second force receiving member 43 fixed to the first zoom lens 41, and a third force receiving member 44 fixed to the second zoom lens 42. The lens barrel 1 is provided with a second guide hole 12 extending linearly along the axial direction of the focusing lens 51. The size of the second force receiving member 43 and the size of the third force receiving member 44 are both adapted to the width of the second guide hole 12. The zoom lens group 4 further comprises a force applying member 45 rotationally connected to the lens barrel 1. The force applying member 45 is provided with a second force applying hole 451 and a third force applying hole 452, both of which extend helically along the axial direction of the focusing lens 51. The second force applying hole 451 and the third force applying hole 452 are arranged in a spaced manner. The second force applying hole 451 has a first end 4511 and a second end 4512. From the first end 4511 to the second end 4512, the spacing between the second force applying hole 451 and the third force applying hole 452 gradually increases. The second force receiving member 43 is sequentially arranged in the second guide hole 12 and the second force applying hole 451, and the third force receiving member 44 is sequentially arranged in the second guide hole 12 and the third force applying hole 452. In this way, during the process of rotating the force applying member 45 in one direction by hand, the sidewall of the second force applying hole 451 pushes the second force receiving member 43, and the sidewall of the third force applying hole 452 pushes the third force receiving member 44. The second force receiving member 43 and the third force receiving member 44 gradually approach each other, and the first zoom lens 41 and the second zoom lens 42 gradually approach each other. Similarly, during the process of rotating the force applying member 45 in the other direction by hand, the first zoom lens 41 and the second zoom lens 42 gradually move away from each other. In this way, manual zooming is realized.
[0074] Preferably, the second force receiving member 43, the second guide hole 12, and the second force applying hole 451 are each provided with two, each second force receiving member 43 corresponding to one second guide hole 12 and one second force applying hole 451, and the two second force receiving members 43 are symmetrically arranged about the axis of the focusing lens 51. The third force receiving member 44 and the third force applying hole 452 are each provided with two, each third force receiving member 44 corresponding to one second guide hole 12 and one third force applying hole 452, and the two third force receiving members 44 are symmetrically arranged about the axis of the focusing lens 51.
[0075] In some embodiments, the second force receiving member 43, the second guide hole 12, and the second force applying hole 451 are each provided with at least three, each force receiving member corresponding to one second guide hole 12 and one second force applying hole 451, and the respective second force receiving members 43 are uniformly distributed along the circumferential direction of the focusing lens 51. The third force receiving member 44 and the third force applying hole 452 are each provided with at least three, each force receiving member corresponding to one second guide hole 12 and one third force applying hole 452, and the respective third force receiving members 44 are uniformly distributed along the circumferential direction of the focusing lens 51.
[0076] In some embodiments, the second force receiving member 43, the second guide hole 12 and the second force applying hole 451 can also be provided only one. The third force receiving member 44 and the third force applying hole 452 can also be provided only one.
[0077] Referring to Figure 2 The force applying member 45 is sleeved on the lens barrel 1, and the zoom lens group 4 further comprises a zoom hand wheel 46, the zoom hand wheel 46 is fixedly sleeved on the force applying member 45, and a plurality of grooves are uniformly arranged on the outer circumferential side of the zoom hand wheel 46 along the circumferential direction of the focusing lens 51, so as to facilitate the user to twist the zoom hand wheel 46, thereby realizing manual zooming.
[0078] In other embodiments, the connection part 732 and the lens barrel 1 can also be rotatably connected through a bearing, and the force applying member 45 and the lens barrel 1 can also be rotatably connected through a bearing.
[0079] The present application further provides an endoscope comprising the above-mentioned endoscope automatic focusing camera. In the endoscope, the focusing lens group 5 is arranged behind the zoom lens group 4, which enables the driving assembly 7 to be arranged at the middle or rear part of the handle 2, thereby moving the center of gravity of the entire endoscope automatic focusing camera to the rear, which is beneficial to prevent the user from holding the camera unbalancedly and is beneficial to the user to hold the camera stably.
[0080] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.
[0081] The above-mentioned embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the protection scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.
Claims
1. An endoscope autofocus camera, characterized in that, include: Lens tube (1); The handle (2) is fixedly sleeved on the lens tube (1); An objective lens (3) is disposed inside the lens tube (1); The zoom lens group (4) is located inside the lens tube (1); The focusing lens group (5) is located inside the lens barrel (1), and the objective lens (3), the zoom lens group (4) and the focusing lens group (5) are arranged in sequence from front to back; An aperture stop (6) is located in front of the focusing lens group (5); and The drive assembly (7), connected to the focusing lens group (5) to drive the focusing lens group (5) to move back and forth, is located behind the zoom lens group (4) and in the middle or rear of the handle (2).
2. The endoscope autofocus camera according to claim 1, characterized in that, The drive assembly (7) includes a reversible motor (71), a transmission gear (72), and a driven member (73). The reversible motor (71) has a rotating shaft (711), and the transmission gear (72) is fixed to the rotating shaft (711) and coaxially arranged with the rotating shaft (711). The driven member (73) includes a driven gear (731) and a connecting part (732). The driven gear (731) meshes with the transmission gear (72), and the connecting part (732) is fixedly connected to the end face of the driven gear (731) and rotatably connected to the lens barrel (1). The rotation axis of the connecting part (732) relative to the lens barrel (1) is collinear with the axis of the driven gear (731). The focusing lens assembly (5) includes a focusing lens (51) and a first force-bearing member (52), the first force-bearing member (52) being fixedly connected to the focusing lens (51); the lens barrel (1) is provided with a first guide hole (11), the first guide hole (11) extending linearly along the axial direction of the focusing lens (51), the width of the first guide hole (11) being adapted to the size of the first force-bearing member (52), the connecting part (732) is provided with a first force-applying hole (7321), the first force-applying hole (7321) extending spirally along the axial direction of the focusing lens (51), and the first force-bearing member (52) passing through the first guide hole (11) and the first force-applying hole (7321) in sequence.
3. The endoscope autofocus camera according to claim 2, characterized in that, The number of teeth of the transmission gear (72) is less than the number of teeth of the driven gear (731).
4. The endoscope autofocus camera according to claim 2, characterized in that, The width of the first force-applying hole (7321) is adapted to the size of the first force-receiving member (52).
5. The endoscope autofocus camera according to claim 2, characterized in that, The endoscope tube (1) includes a large-diameter portion (14) and a small-diameter portion (15), which are coaxially arranged. The endoscope autofocus camera also includes a beam splitter assembly (8), which is arranged opposite to the end face of the large-diameter portion (14). The large-diameter portion (14), the small-diameter portion (15), and the beam splitter assembly (8) together enclose a limiting space. The follower (73) is sleeved on the small-diameter portion (15) and located within the limiting space. The dimension of the follower (73) along the axis of the focusing lens group (5) is adapted to the dimension of the limiting space along the axis of the focusing lens group (5).
6. The endoscope autofocus camera according to claim 1, characterized in that, The endoscope autofocus camera also includes a beam splitter assembly (8), which is located behind the focusing lens group (5). The beam splitter assembly (8) is located inside the handle (2) and is arranged side by side with the drive assembly (7) in the vertical direction.
7. The endoscope autofocus camera according to claim 1, characterized in that, The focusing lens group (5) is located at the rear of the lens barrel (1), and the driving assembly (7) is located behind the lens barrel (1).
8. The endoscope autofocus camera according to claim 1, characterized in that, The objective lens (3) is located outside the handle (2), and the zoom lens group (4) is located outside the handle (2) on the side away from the focusing lens group (5).
9. The endoscope autofocus camera according to claim 1, characterized in that, The objective lens (3), the zoom lens group (4), the aperture (6) and the focusing lens group (5) are arranged sequentially along the length of the handle (2).
10. An endoscope, characterized in that, The endoscope autofocus camera includes any one of claims 1 to 9.