Optical zoom lens for medical endoscope

Abstract

The present invention relates to an optical par-zoom lens for medical endoscopes, and the technical solution thereof includes: a cam groove sleeve; a focus lens group mounted in the cam groove sleeve; a fixed seat rotatably mounted in the cam groove sleeve; a fixed lens mounted in the fixed seat; a plurality of zoom lens assemblies mounted in the fixed seat; and a focus driving assembly mounted on the cam groove sleeve for driving the focus lens group to move along the optical axis; and a zoom driving assembly mounted on the cam groove sleeve for driving a plurality of zoom lens assemblies to move along the optical axis and to rotate synchronously with the fixed lens around the optical axis in the fixed seat. Thus, the coaxiality, inclination and axial positioning accuracy between the zoom lens assembly and the fixed lens are improved, and the problem of image jitter and image blurring caused by the position error between the zoom lens group and the fixed lens group during the par-zooming process is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of optical lenses, and in particular to an optical zoom lens for a medical endoscope. Background Art

[0002] With the development of medical technology, minimally invasive surgery has also flourished. Through minimally invasive surgery, the medical purpose of traditional open surgery can be achieved at a lower cost of medical trauma, and it can reduce the pain of patients and accelerate their recovery. As the key equipment for minimally invasive surgery, the endoscope camera system is the most critical equipment. Its purpose is to transmit the real-time image of the organs or visceral tissues inside the patient's cavity to the display for medical staff to watch in real time. Therefore, the clarity and stability of the image are the key, which directly affects the doctor's judgment of the observed object, and the optical lens of the endoscope camera system directly affects the image clarity.

[0003] The traditional lens group fixing method is to directly install the front zoom lens group, the rear zoom lens group, and the fixed lens group into the driving cam groove sleeve. During the installation process of the three and the movement process of the zoom after assembly, the accumulated deviation will become larger, which greatly increases the size chain links, and the axial and radial deviations become larger. The coaxiality cannot be guaranteed, and due to the front and rear zoom. The result is often a poor zoom effect, and the imaging phase surface will change along the optical axis and radial direction. Once the zoom is changed, the image will become blurred, and even the picture will jump during the zoom process, requiring refocusing, which brings inconvenience to medical staff in observing human tissues or internal organs. At the same time, the picture jumping will also affect the operation of the surgical process. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an optical par-zoom lens for a medical endoscope, thereby effectively improving the coaxiality, inclination, and axial positioning accuracy between the zoom lens assembly and the fixed lens, so that the imaging phase surface will not change in the radial direction, and solving the problem of image jitter and image blurring caused by the position error between the zoom lens group and the fixed lens group during the par-zoom process.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: an optical zoom lens for a medical endoscope, comprising: a cam groove sleeve; a focus lens group assembled in the cam groove sleeve; a fixed seat rotatably assembled in the cam groove sleeve; a fixed lens assembled in the fixed seat; a plurality of zoom lens assemblies assembled in the fixed seat; and a focus drive assembly assembled on the cam groove sleeve for driving the focus lens group to move along the optical axis; and a zoom drive assembly assembled on the cam groove sleeve for driving a plurality of the zoom lens assemblies to move along the optical axis and to rotate synchronously with the fixed lens around the optical axis in the fixed seat.

[0006] According to a further configuration of the present invention, the zoom lens assembly is divided into two groups, namely a front zoom lens group and a rear zoom lens group.

[0007] According to a further configuration of the present invention, the focus drive assembly includes: a focus pin sequentially assembled on the cam groove sleeve and the focus lens group; and a focus ring assembled on one end of the cam groove sleeve and used for driving the focus pin to drive the focus lens group to move along the optical axis; a focus cam groove is opened on the cam groove sleeve for the focus pin to pass through.

[0008] A further configuration of the present invention is that the zoom drive assembly includes: a front pin sequentially assembled on the cam groove sleeve, the fixed seat, and the front zoom lens group; a rear pin sequentially assembled on the cam groove sleeve, the fixed seat, and the rear zoom lens group; a limit pin sequentially assembled on the cam groove sleeve and the fixed seat; and a zoom ring assembled on the cam groove sleeve, which is used to drive the front pin and the rear pin to drive the front zoom lens group and the rear zoom lens group to move along the optical axis and rotate synchronously with the fixed lens in the fixed seat; the cam groove sleeve is sequentially provided with a front cam groove, a positioning hole, and a rear cam groove for the front pin, the limit pin, and the rear pin to movably penetrate; the fixed seat is provided with a first long groove and a second long groove for the front pin and the rear pin to movably penetrate along the optical axis, and an annular groove for the limit pin to penetrate.

[0009] According to a further configuration of the present invention, the focus lens group comprises: a focus lens seat and a focus lens, wherein the focus lens seat is provided with a focus pin hole for the focus pin to pass through.

[0010] According to a further configuration of the present invention, the front zoom lens group comprises: a front zoom lens seat, a front zoom lens, and the front zoom lens, wherein the front zoom lens seat is provided with a front pin hole for the front pin to pass through.

[0011] According to a further configuration of the present invention, the rear zoom lens group comprises: a rear zoom lens seat and a rear zoom lens, wherein the rear zoom lens seat is provided with a rear pin hole for the rear pin to pass through.

[0012] According to a further configuration of the present invention, a front window protection lens is provided at the end of the cam groove sleeve close to the focusing lens group.

[0013] In summary, the present invention has the following beneficial effects:

[0014] 1. An optical par-zoom lens for a medical endoscope in the present invention is provided. By assembling a front zoom lens group and a rear zoom lens group on a fixed seat, the front zoom lens group and the rear zoom lens group can move along the optical axis under the drive of a zoom drive assembly, and drive the fixed seat and the fixed lens to rotate synchronously around the optical axis, thereby greatly improving the coaxiality, inclination, and axial positioning accuracy among the front zoom lens group, the rear zoom lens group and the fixed lens. The imaging phase plane will not change in the radial direction, and the problem of image jumping and image blurring caused by the position error of the lens during the par-zoom process is effectively solved.

[0015] 2. The optical zoom lens for a medical endoscope in the present invention has the advantages of compact structure and reasonable design, as the zoom lens assembly and the fixed lens are assembled in a fixed seat to form a whole module, and then assembled into a cam groove sleeve as a whole, thereby improving the convenience of the assembly process. Compared with the traditional solution of directly assembling into the cam groove sleeve, the dimension chain is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of an optical zoom lens for a medical endoscope in an embodiment of the present invention;

[0017] Figure 2 : is an exploded view of the structure of the optical zoom lens of a medical endoscope in an embodiment of the present invention;

[0018] Figure 3 is a cross-sectional view of an optical zoom lens for a medical endoscope according to an embodiment of the present invention;

[0019] Figure 4 It is a partial cross-sectional view of the optical zoom lens of a medical endoscope in an embodiment of the present invention.

[0020] Explanation of reference numerals: 11, focus ring; 12, zoom ring; 13, cam groove sleeve; 131, front window protection lens; 1321, front cam groove; 1322, rear cam groove; 1323, positioning hole; 1324, focus cam groove; 14, limit pin; 151, focus pin; 152, front pin; 153, rear pin; 16, focus lens group; 161, focus lens seat; 1611, focus pin Nail hole; 162, focusing lens; 17, front zoom lens group; 171, front zoom lens seat; 1711, front pin hole; 172, front zoom lens; 181, fixing seat; 1811, first long groove; 1812, second long groove; 1813, annular groove; 182, fixing lens; 19, rear zoom lens group; 191, rear zoom lens seat; 1911, rear pin hole; 192, rear zoom lens. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0022] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0023] Embodiment: A medical endoscope optical zoom lens, such as Figure 1 and Figure 2 As shown, it includes: a cam groove sleeve 13; a focus lens group 16 assembled in the cam groove sleeve 13; a fixed seat 181 rotatably assembled in the cam groove sleeve 13; a fixed lens 182 assembled in the fixed seat 181; a plurality of zoom lens assemblies assembled in the fixed seat 181; and a focus drive assembly assembled on the cam groove sleeve 13 and used to drive the focus lens group 16 to move along the optical axis; and a zoom drive assembly assembled on the cam groove sleeve 13 and used to drive a plurality of zoom lens assemblies to move along the optical axis and rotate synchronously with the fixed lens 182 around the optical axis in the fixed seat 181. A front window protection lens 131 is provided at the end of the cam groove sleeve 13 close to the focus lens group 16. The focus drive assembly and the zoom drive assembly drive the focus lens group 16 and the zoom lens assembly respectively to achieve optical focus and zoom functions. During the zooming process, the zoom lens assembly, the fixed lens 182, and the fixed seat 181 always maintain synchronous rotation around the axis, thereby effectively avoiding the radial deviation change caused by asynchronous rotation and ultimately causing the picture to jump, improving the relative axial position accuracy and deflection of the zoom lens assembly relative to the fixed lens 182, and effectively avoiding the axial deviation and inclination errors that ultimately cause image blur.

[0024] like Figure 2 As shown, in the present embodiment, the zoom lens assembly is divided into two groups, namely the front zoom lens group 17 and the rear zoom lens group 19, and the fixed lens 182 is arranged between the front zoom lens group 17 and the rear zoom lens group 19. In other embodiments, the zoom lens assembly can be divided into three groups, four groups, etc.

[0025] like Figure 1-3As shown, the focus driving assembly includes: a focus pin 151 assembled on the cam groove sleeve 13 and the focus lens group 16 in sequence; and a focus ring 11 assembled on one end of the cam groove sleeve 13 and used to drive the focus pin 151 to drive the focus lens group 16 to move along the optical axis; a focus cam groove 1324 is opened on the cam groove sleeve 13 for the focus pin 151 to pass through. The focus lens group 16 includes: a focus lens seat 161, a focus lens 162, a focus pin hole 1611 for the focus pin 151 to pass through is opened on the focus lens seat 161, and the focus cam groove 1324 is used to guide the focus pin 151 to move along the optical axis while rotating, so as to achieve focusing. The usage scenario of the focus lens group 16 is as follows: first, aim at the shooting object, and drive the focus pin 151 to drive the focus lens 162 to rotate through the focus ring 11. Since the focus pin 151 is passed through the focus cam groove 1324, the focus lens 162 will move back and forth along the optical axis with the focus cam groove 1324 during the rotation process, so that the image reaches the clearest state, and then optically zoom in or out.

[0026] like Figure 1-3 As shown, the zoom driving assembly includes: a front pin 152 sequentially mounted on the cam groove sleeve 13, the fixing seat 181, and the front zoom lens group 17; a rear pin 153 sequentially mounted on the cam groove sleeve 13, the fixing seat 181, and the rear zoom lens group 19; a stop pin 14 sequentially mounted on the cam groove sleeve 13 and the fixing seat 181; and a stop pin 14 mounted on the cam groove sleeve 13 for driving the front pin 152 and the rear pin 153 to drive the front zoom lens group 17 and the rear zoom lens group 19 to move along the optical axis and rotate synchronously with the fixed lens 182 in the fixing seat 181. The zoom ring 12; the cam groove sleeve 13 is provided with a front cam groove 1321, a positioning hole 1323, and a rear cam groove 1322 for the front pin 152, the limit pin 14, and the rear pin 153 to movably penetrate in sequence; the fixing seat 181 is provided with a first long groove 1811 and a second long groove 1812 for the front pin 152 and the rear pin 153 to movably penetrate along the optical axis, and an annular groove 1813 for the limit pin 14 to penetrate, the front cam groove 1321 and the rear cam groove 1322 are respectively used to guide the front zoom lens group 17 and the rear zoom lens group 19 to move along the optical axis while rotating,

[0027] In this embodiment, if Figure 1-3As shown, the front zoom lens group 17 includes: a front zoom lens seat 171, a front zoom lens 172, and a front pin hole 1711 for the front pin 152 to pass through is opened on the front zoom lens seat 171. The rear zoom lens group 19 includes: a rear zoom lens seat 191, a rear zoom lens 192, and a rear pin hole 1911 for the rear pin 153 to pass through is opened on the rear zoom lens seat 191. The front zoom lens 172 and the rear zoom lens 192 are pre-assembled into the front zoom lens seat 171 and the rear zoom lens group seat 191 respectively, and are fixed by glue, and then assembled at both ends of the fixed seat 181. In this way, during the zooming process, the three rotate concentrically at the same time, and the front and rear zoom lens groups 19 can move forward and backward along the optical axis while rotating synchronously with the fixed lens 182 and the fixed seat 181. When the three groups of lenses rotate synchronously around the optical axis, the radial relative positions will not change, which eliminates radial deviation and ensures coaxiality. The imaging phase surface will not change in the radial direction, so the picture will not jump. At the same time, compared with the traditional solution of directly assembling to the cam groove sleeve 13, the dimension chain is shortened and the axial position deviation and inclination are greatly reduced.

[0028] In actual use, by operating the zoom ring 12, the front zoom lens group 17 and the rear zoom lens group 19 are driven to move along the optical axis to realize the optical zoom function. The front zoom lens group 17 and the rear zoom lens group 19 are assembled in the fixed seat 181, and the front pin 152 and the rear pin 153 are driven by the zoom ring 12 to drive the front zoom lens group 17 and the rear zoom lens group 19 to rotate synchronously. Since the front pin 152 rotates with the zoom ring 12, it also slides along the front cam groove 1321 of the cam groove sleeve 13. At the same time, the front pin 152 is restricted to slide in the first long groove 1811 of the fixed seat 181, and the first long groove 1811 is parallel to the optical axis, so that the front pin 152 drives the front zoom lens group 17 to move along the optical axis; similarly, the rear pin 153 fixed on the rear zoom lens group 19 is also driven by the zoom ring 12. Down, it slides along the rear cam groove 1322 of the cam groove sleeve 13, and is restricted to slide in the second long groove 1812 of the fixed seat 181, and the second long groove 1812 is parallel to the optical axis, so that the rear pin 153 drives the rear zoom lens group 19 to move along the optical axis; in this process, the fixed seat 181 and the fixed lens 182 also rotate synchronously with the rotation of the front pin 152 or the rear pin 153. Since the fixed seat 181 is fixed in the positioning hole 1323 of the cam groove sleeve 13 through the annular groove 1813 and is axially limited by the limit pin 14, the fixed lens 182 and the fixed seat 181 can only rotate around the optical axis at the original position without axial movement.

[0029] In combination with the above, it can be known that when the zoom ring 12 is operated, the front zoom lens group 17, the fixed lens 182 and the fixed seat 181, and the rear zoom lens group 19 always maintain synchronous rotation around the axis, thereby effectively avoiding the radial deviation change caused by asynchronous rotation and ultimately causing the picture to jump. At the same time, the front zoom lens group 17 and the rear zoom lens group 19 are respectively assembled inside the fixed seat 181, which improves the relative axial position accuracy and deflection of the front zoom lens 172 and the rear zoom lens 192 relative to the fixed lens 182, and effectively avoids the axial deviation and inclination errors that ultimately cause image blur.

[0030] Specific working process and principle: by assembling the front zoom lens group 17 and the rear zoom lens group 19 on the fixed seat 181, under the drive of the zoom drive assembly, the front zoom lens group 17 and the rear zoom lens group 19 can move along the optical axis and drive the fixed seat 181 and the fixed lens 182 to rotate synchronously around the optical axis, thereby greatly improving the coaxiality, inclination, and axial positioning accuracy between the front zoom lens group 17, the rear zoom lens group 19 and the fixed lens 182, and effectively solving the problem of image jumping and image blurring caused by the position error of the lens during the zoom process. In addition, since the zoom lens assembly and the fixed lens 182 are assembled in the fixed seat 181 to form a whole module, and then assembled into the cam groove sleeve 13 as a whole, the convenience of the assembly process is improved. Compared with the traditional solution of directly assembling to the cam groove sleeve 13, the size chain is shortened, and it has the advantages of compact structure and reasonable design.

[0031] The above is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An optical zoom lens for medical endoscope, characterized in that: include: Cam groove sleeve (13); A focusing lens group (16) assembled in the cam groove sleeve (13); A fixed seat (181) rotatably assembled in the cam groove sleeve (13); A fixed lens (182) assembled in the fixed seat (181); A plurality of zoom lens assemblies assembled in the fixing seat (181); as well as, A focus driving assembly mounted on the cam groove sleeve (13) and used for driving the focus lens group (16) to move along the optical axis; as well as, A zoom driving assembly mounted on the cam groove sleeve (13) and used for driving a plurality of the zoom lens assemblies to move along the optical axis and to rotate synchronously with the fixed lens (182) around the optical axis in the fixed seat (181); The zoom lens assembly consists of two groups, namely a front zoom lens group (17) and a rear zoom lens group (19); The zoom driving assembly comprises: a front pin (152) sequentially assembled on the cam groove sleeve (13), the fixing seat (181), and the front zoom lens group (17); The rear pin (153) is sequentially assembled on the cam groove sleeve (13), the fixing seat (181), and the rear zoom lens group (19); A stop pin (14) sequentially mounted on the cam groove sleeve (13) and the fixing seat (181); and A zoom ring (12) mounted on the cam groove sleeve (13), used for driving the front pin (152) and the rear pin (153) to drive the front zoom lens group (17) and the rear zoom lens group (19) to move along the optical axis and to rotate synchronously with the fixed lens (182) in the fixed seat (181); The cam groove sleeve (13) is provided with a front cam groove (1321), a positioning hole (1323), and a rear cam groove (1322) for the front pin (152), the limit pin (14), and the rear pin (153) to pass through in sequence; The fixing seat (181) is provided with a first long groove (1811) and a second long groove (1812) for the front pin (152) and the rear pin (153) to movably pass through along the optical axis, and an annular groove (1813) for the limit pin (14) to pass through.

2. The optical zoom lens for medical endoscope according to claim 1, characterized in that: The focus driving assembly comprises: a focus pin (151) sequentially assembled on the cam groove sleeve (13) and the focus lens group (16); and A focus ring (11) mounted on one end of the cam groove sleeve (13) and used for driving the focus pin (151) to drive the focus lens group (16) to move along the optical axis; The cam groove sleeve (13) is provided with a focus cam groove (1324) for the focus pin (151) to pass through.

3. The optical zoom lens for medical endoscope according to claim 2, characterized in that: The focusing lens group (16) comprises: a focusing lens seat (161) and a focusing lens (162); the focusing lens seat (161) is provided with a focusing pin hole (1611) for the focusing pin (151) to pass through.

4. The optical zoom lens for medical endoscope according to claim 1, characterized in that: The front zoom lens group (17) comprises: a front zoom lens seat (171) and a front zoom lens (172); the front zoom lens seat (171) is provided with a front pin hole (1711) for the front pin (152) to pass through.

5. The optical zoom lens for medical endoscope according to claim 1, characterized in that: The rear zoom lens group (19) comprises: a rear zoom lens seat (191) and a rear zoom lens (192); the rear zoom lens seat (191) is provided with a rear pin hole (1911) for the rear pin (153) to pass through.

6. The optical zoom lens for medical endoscope according to claim 1, characterized in that: A front window protection lens (131) is provided at the end of the cam groove sleeve (13) close to the focusing lens group (16).

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