Focusing equipment and therapeutic apparatus

Abstract

The utility model discloses a focusing device and a therapeutic apparatus, and relates to the technical field of focusing devices, the focusing device comprises a first focusing cylinder, the first focusing cylinder is internally provided with a first light path channel; a first lens group and a second lens group are arranged in the first focusing cylinder, the first lens group comprises a plurality of first lenses which are arranged along the optical axis direction and are fixedly connected with the first focusing cylinder, and the second lens group comprises a plurality of second lenses which are arranged along the optical axis direction and are in sliding connection with the first focusing cylinder in the optical axis direction; the first end of the focusing rod extends into the first focusing cylinder and is fixedly connected with the second lens; an operator can adjust the size of a light spot by operating the focusing rod, so that the focusing device has a relatively stable focusing effect, and the focusing cost is reduced; the positioning assembly provides a focusing basis for an operator, and the focusing precision of the focusing equipment is improved; the first focusing cylinder separates the focusing rod from the first light path channel, so that the focusing device has high focusing efficiency and focusing precision.

Description

A focusing device and therapeutic instrument Technical Field

[0001] This utility model relates to the field of focusing device technology, and in particular to a focusing device and a therapeutic instrument. Background Technology

[0002] Existing technologies adjust the focal length by changing the distance between two lens groups in focusing devices such as focusing lenses. Most of these adjustments are achieved through automatic focusing via drive motors or manual focusing by operators. However, focusing via drive motors is not only costly but also highly dependent on power supply. Insufficient or unstable power supply can prevent the focusing device from focusing or result in low focusing accuracy. Manual focusing by operators is problematic. Firstly, operators rely on experience, leading to lower focusing accuracy. Secondly, dust and other impurities from the operator's hands can easily enter the focusing device, hindering lens group movement and prolonging focusing time.

[0003] Therefore, how to reduce the focusing cost of focusing equipment while ensuring that the focusing equipment has high focusing accuracy and efficiency has become a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a focusing device and a therapeutic instrument that reduces the focusing cost of the focusing device while enabling it to have high focusing accuracy and efficiency.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a focusing device, the focusing device comprising:

[0007] A first focusing tube, wherein a first optical path channel is provided inside the first focusing tube along the optical axis and extending through the first focusing tube, the first optical path channel being used for light to pass through;

[0008] A first lens group and a second lens group are disposed inside the first focusing tube. The first lens group includes a plurality of first lenses arranged along the optical axis and fixedly connected to the first focusing tube. The second lens group includes a plurality of second lenses arranged along the optical axis and slidably connected to the first focusing tube in the optical axis direction. The first lenses and the second lenses are matched so that light can form a light spot after passing through the first optical path channel.

[0009] A focusing assembly, the focusing assembly including a focusing rod, a first end of the focusing rod extending into the first focusing cylinder and connected to the second lens, and a second end of the focusing rod located outside the first focusing cylinder and forming an operating end for an operator to adjust the focusing rod;

[0010] A positioning component, disposed on the second lens, is used to detect the distance between the first lens and the corresponding second lens.

[0011] Preferably, the focusing device further includes a second focusing cylinder connected to the first focusing cylinder. The second focusing cylinder is provided with a second optical path channel that is connected to the first optical path channel. The second optical path channel passes through the second focusing cylinder, and the first optical path channel and the second optical path channel are arranged sequentially and connected along the optical axis.

[0012] Preferably, both the first optical path channel and the second optical path channel have a fixed cross-section structure, and the cross-sections of the first optical path channel and the second optical path channel are the same; or, the cross-section of the second optical path channel gradually expands along the optical axis.

[0013] Preferably, the first lens group and the second lens group are arranged sequentially along the optical axis, or the first lens and the second lens are arranged alternately along the optical axis.

[0014] Preferably, the focusing rod is arranged along the optical axis and connected to the second lens via a connector; the focusing assembly further includes a sliding groove disposed on the first focusing cylinder and formed along the optical axis, the sliding groove being slidably connected to the connector in the optical axis direction;

[0015] The connector is threadedly connected to the focusing rod, or the focusing rod has a spiral groove, and the spiral groove and the connector are slidably connected along the extension direction of the spiral groove.

[0016] Preferably, the positioning component includes a plurality of detection elements arranged along the optical axis, and a positioning element disposed on the second lens, wherein the positioning element is located within the detection range of the detection elements, and the detection elements are signal-connected to a controller.

[0017] Preferably, the first lens group includes a first lens, the second lens group includes a second lens, and the second lens is provided with an indicator extending from the first focusing tube. The first focusing tube is provided with a scale line arranged along the optical axis, the indicator is arranged toward the scale line, and the scale line is located on the movement trajectory of the indicator.

[0018] Preferably, the focusing device includes a protective cover, the cavity of which is provided with the first focusing cylinder, the focusing component and the positioning component; the protective cover is provided with a light inlet hole and a light outlet hole respectively connected to both ends of the first optical path channel, and the operating end extends out of the protective cover, and a sealing element is provided between the protective cover and the focusing rod.

[0019] Preferably, the focusing device further includes a limiting component, the limiting component comprising:

[0020] A plurality of first limiting holes are provided on the first focusing cylinder and arranged along the circumference of the first focusing cylinder;

[0021] The second limiting hole, the second lens group also includes a plurality of second lens seats that slide with the first focusing cylinder in the optical axis direction, the second lens is provided in the second lens seat, and the second lens seat is provided with a plurality of second limiting holes corresponding to the first limiting hole in the circumferential direction.

[0022] A limiting member is provided, which is used to pass through the first limiting hole and the second limiting hole in sequence after the second lens holder reaches the preset position.

[0023] In addition, this utility model also provides a therapeutic device, which includes the above-mentioned focusing device.

[0024] The present invention achieves the following technical advantages over the prior art:

[0025] The focusing device of this utility model includes a first focusing cylinder, within which a first optical path channel is arranged along the optical axis and extends through the first focusing cylinder. The first focusing cylinder also includes a first lens group and a second lens group. The first lens group includes several first lenses arranged along the optical axis and fixedly connected to the first focusing cylinder. The second lens group includes several second lenses arranged along the optical axis and slidably connected to the first focusing cylinder along the optical axis. The first and second lenses are matched so that light passing through the first lens, the second lens, and the first optical path channel forms a light spot. The focusing assembly includes... A focusing lever has its first end extending into the first focusing cylinder and fixedly connected to the second lens, while its second end extends outside the first focusing cylinder, forming an operating end for user operation. The optical axis refers to the center line of the light beam incident into the first focusing cylinder, and the optical axis direction refers to the main direction of propagation of the light beam within the first focusing cylinder. The operator can manipulate the focusing lever, such as by rotating or moving it, to move the position of the second lens within the first focusing cylinder, changing the distance between the first and second lenses (i.e., the focal length), and thereby adjusting the size of the light spot generated after the light passes through the first optical path channel.

[0026] Meanwhile, compared with the existing technology that uses a rotary motor or other driving device to move the focusing rod, since the focusing rod is manually operated without the need for power or other energy support, the probability of the focusing rod failing to move the second lens to achieve focusing or the focusing effect being unstable due to insufficient or unstable power or other energy supply is reduced. This makes the focusing device in this utility model have a more stable focusing effect and reduces the focusing cost.

[0027] Furthermore, the positioning component on the second lens can detect and provide feedback on the distance between the first and second lenses, which provides the operator with a basis for focusing. The operator can determine whether the focusing operation is completed based on the feedback from the positioning component. If the focusing operation is not completed, the focal length should be increased or decreased. Compared with the operator focusing only based on experience, this improves the focusing accuracy of the focusing device in this utility model.

[0028] Furthermore, if the focusing rod is built into the first focusing tube, improper operation by the operator could cause the focusing rod to tilt, easily blocking the first optical path and hindering the formation of the light spot. This would result in the actual light spot area being smaller than the required area. Also, since a portion of the focusing rod is placed inside the first focusing tube, and the area where the focusing rod is operated can enter and exit the first focusing tube during focusing, dust and other impurities from the operator's hands can easily adhere to the focusing rod after adjustment. These impurities can then enter the first focusing tube with the focusing rod, blocking the first optical path, or enter between the first focusing tube and the second lens, hindering the second optical path. The problem of lens movement extending focusing time exists in traditional methods. However, this invention addresses this by placing the focusing rod (excluding the first end) outside the first focusing cylinder. The first focusing cylinder isolates the focusing rod from the first optical path channel, reducing the area where the focusing rod enters the first focusing cylinder. This effectively reduces the problem of the focusing rod or impurities obstructing the first optical path channel, lowering focusing accuracy, and impurities hindering the movement of the second lens, thus extending focusing time. As a result, the focusing device in this invention has higher focusing efficiency and accuracy. In summary, the focusing device in this invention reduces focusing costs while achieving high focusing accuracy and efficiency. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 is a schematic diagram of the coking equipment;

[0031] Figure 2 is a top view of the focusing equipment;

[0032] Figure 3 is a cross-sectional view at point AA in Figure 2;

[0033] Figure 4 is a schematic diagram of the detection component and the positioning component;

[0034] The components include: 1. First focusing cylinder; 2. Second focusing cylinder; 3. First lens; 4. First lens holder; 5. Second lens; 6. Second lens holder; 7. Focusing rod; 8. First optical path channel; 9. Second optical path channel; 10. Slide groove; 11. Connector; 12. First support base; 13. Second support base; 14. Support plate; 15. Detection component; 16. Connector; 17. Positioning component. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] As shown in Figures 1 to 4, this utility model discloses a focusing device, which includes a first focusing cylinder 1. The first focusing cylinder 1 has a first optical path channel 8 arranged along the optical axis and passing through it. The first focusing cylinder 1 also has a first lens group and a second lens group. The first lens group includes several first lenses 3 arranged along the optical axis and fixedly connected to the first focusing cylinder 1. The second lens group includes several second lenses 5 arranged along the optical axis and slidably connected to the first focusing cylinder 1 along the optical axis. The first lenses 3 and the second lenses 5 are matched so that light passing through the first lenses 3, the second lenses 5, and the first optical path channel 8 can form light... The focusing assembly includes a focusing rod 7. The first end of the focusing rod 7 extends into the first focusing cylinder 1 and is fixedly connected to the second lens 5. The second end of the focusing rod 7 is outside the first focusing cylinder 1 and forms an operating end for user operation. The optical axis refers to the center line of the light beam entering the first focusing cylinder 1, and the optical axis direction refers to the main direction of propagation of the light beam entering the first focusing cylinder 1. The operator can move the position of the second lens 5 within the first focusing cylinder 1 by manipulating the focusing rod 7, such as by rotating or moving the focusing rod 7, thereby changing the distance between the first lens 3 and the second lens 5, i.e., the focal length, and thus adjusting the size of the light spot generated after the light passes through the first optical path channel 8.

[0038] Meanwhile, compared with the existing technology that uses a rotary motor or other driving device to move the focusing rod 7, since the manual operation of the focusing rod 7 does not require power or other energy support, this reduces the probability that the focusing rod 7 cannot move the second lens 5 to achieve focusing due to insufficient or unstable power or other energy supply, or that the focusing effect is unstable. This makes the focusing device in this utility model have a more stable focusing effect and reduces the focusing cost.

[0039] Furthermore, the positioning component on the second lens 5 can detect and provide feedback on the distance between the first lens 3 and the second lens 5, which provides the operator with a basis for focusing. The operator can determine whether the focusing operation is completed based on the feedback from the positioning component. If the focusing operation is not completed, the focal length should be increased or decreased. Compared with the operator focusing only based on experience, this improves the focusing accuracy of the focusing device in this utility model.

[0040] Furthermore, if the focusing rod 7 is built into the first focusing cylinder 1, improper operation by the operator could cause the focusing rod 7 to tilt, easily blocking the first optical path channel 8 and hindering the formation of the light spot. This would result in the actual light spot area being smaller than the required area. Also, since a portion of the focusing rod 7 is placed inside the first focusing cylinder 1, and the area where the focusing rod 7 is operated can enter and exit the first focusing cylinder 1 during focusing, dust and other impurities from the operator's hands can easily adhere to the focusing rod 7 after adjustment. These impurities can then enter the first focusing cylinder 1 along with the focusing rod 7, blocking the first optical path channel 8, or entering between the first focusing cylinder 1 and the second lens 5, obstructing the light path. The present invention addresses the problem of obstructing the movement of the second lens 5 and prolonging the focusing time. However, this invention places the area of ​​the focusing rod 7, excluding the first end, outside the first focusing cylinder 1. The first focusing cylinder 1 isolates the focusing rod 7 from the first optical path channel 8. This reduces the area of ​​the focusing rod 7 entering the first focusing cylinder 1 and effectively reduces the problem of the focusing rod 7 or impurities obstructing the first optical path channel 8, thus reducing the focusing accuracy, as well as the problem of impurities hindering the movement of the second lens 5 and prolonging the focusing time. As a result, the focusing device in this invention has higher focusing efficiency and focusing accuracy. In summary, the focusing device in this invention reduces focusing costs while having higher focusing accuracy and focusing efficiency.

[0041] Here, the optical axis refers to the center line of the light beam entering the first focusing tube 1, and the optical axis direction refers to the main direction of propagation of the light beam entering the first focusing tube 1, i.e., the direction in which no refraction occurs; or, the optical axis direction can also be understood as the direction from the light-inlet end of the first focusing tube 1 to the light-outlet end of the first focusing tube 1. The shape of the first focusing tube 1 is not limited, as long as a channel arranged along the optical axis direction is provided inside the first focusing tube 1; when the first focusing tube 1 is cylindrical, the optical axis direction is the axial direction of the first focusing tube 1. One end of the first focusing tube 1 is provided with a light inlet for the light beam (also called ray) to enter, and the light inlet is connected to the first optical path channel 8.

[0042] The first lens 3 and the first focusing tube 1 can be fixedly connected by adhesive or snap-fit. The first lens 3 and the second lens 5 are arranged along the optical axis, meaning that the optical axis direction coincides with the principal axis of the first lens 3 and the principal axis or principal optical axis of the second lens 5. The first lens 3 and the second lens 5 are matched, meaning that the combination of the number, position, type, and other elements of the first lens 3 and the second lens 5 arranged in the first focusing tube 1 allows light to form a spot after passing through the first lens 3 and the second lens 5 and exiting from the first optical path channel 8. The distance between the first lens 3 and the second lens 5 must not exceed the sum of the focal lengths of the two lenses to prevent excessive dispersion of light after passing through the first optical path channel 8, thus preventing the formation of a clear spot. The first lens 3 and the second lens 5 can both be convex lenses; or, the first lens 3 can be a plano-convex lens and the second lens 5 can be an aspherical lens; or, the first lens 3 and the second lens 5 can also be other combinations of lenses capable of producing a clear spot.

[0043] The first and second lens groups can be arranged in various ways within the first focusing tube 1: for example, the first and second lens groups can be arranged alternately along the optical axis, in which case light passes through several first lenses 3 and then several second lenses 5; or, the first lenses 3 and second lenses 5 can be arranged alternately along the optical axis, in which case light entering the first focusing tube 1 passes through the first lens 3, the second lens 5... the first lens 3 and the second lens 5 in sequence until it passes through the first optical path channel 8; or, the second lens 5 and the first lens 3 can be arranged alternately, in which case light entering the first focusing tube 1 passes through the second lens 5, the first lens 3... the second lens 5 and the first lens 3 in sequence. The first lenses 3 and second lenses 5 can also be arranged in other ways required by other operating conditions.

[0044] To reduce direct contact between the first lens 3, the second lens 5, and the first focusing cylinder 1, thereby reducing damage and contamination to the lens, as shown in Figure 3, in this invention, the first lens 3 is disposed within the first lens holder 4, the first lens holder 4 is fixedly connected to the first focusing cylinder 1, and the second lens 5 is disposed within the second lens holder 6, the second lens holder 6 is slidably connected to the first focusing cylinder 1 in the optical axis direction; wherein, the first lens 3 and the first lens holder 4 are either detachably or non-detachably fixedly connected, and the second lens 5 and the second lens holder 6 are either detachably or non-detachably fixedly connected.

[0045] As shown in Figures 1 to 3, the light-emitting end of the first focusing tube 1 is also connected to the second focusing tube 2. That is, the first focusing tube 1 and the second focusing tube 2 are arranged sequentially along the optical axis. The first focusing tube 1 and the second focusing tube 2 can be fixedly connected by bolts, threads, or snap-fits. The second focusing tube 2 is equivalent to a "barrier" between the light-emitting end of the first focusing tube 1 and the outside world. This allows dust and other impurities to enter the first focusing tube 1 from the light-emitting end after passing through the second focusing tube 2. This reduces the amount of dust and other impurities entering the first focusing tube 1, and reduces the problems caused by dust and other impurities hindering the movement of the second lens 5, prolonging the focusing time, blocking the first optical path channel 8 or the second optical path channel 9, resulting in a smaller light spot and reduced focusing accuracy. The second focusing cylinder 2 has a second optical path channel 9 arranged along the optical axis and extending through it. The second optical path channel 9 communicates with the first optical path channel 8 to ensure that light entering the first optical path channel 8, after passing through the first lens 3 and the second lens 5, can pass through the second optical path channel 9 and form a light spot in the area of ​​the second patient requiring skin repair. Similarly, the shape of the second focusing cylinder 2 is not limited, as long as it has the aforementioned second optical path channel 9 inside; the cross-section of the first optical path channel 8 can be circular or rectangular. As shown in Figures 1-3, the second focusing cylinder 2 has a cylindrical structure, in which case the second optical path channel 9 is arranged along the axial direction of the second focusing cylinder 2.

[0046] Both the first optical path channel 8 and the second optical path channel 9 are constant cross-sectional structures, meaning their cross-sectional area does not change along the optical axis. Furthermore, the cross-sectional dimensions of the first optical path channel 8 and the second optical path channel 9 are identical. The first optical path channel 8 and the second optical path channel 9 are aligned to ensure that light can pass smoothly through them sequentially. Alternatively, as needed, the first optical path channel 8 can be configured to have a constant cross-sectional area along the optical axis, and the cross-section of the second optical path channel 9 at the end closest to the first focusing tube 1 can be equal to the cross-section of the first optical path channel 8. The first optical path channel 8 and the second optical path channel 9 are aligned, and the cross-section of the second optical path channel 9 gradually increases along the optical axis. This makes the second focusing tube 2 act as a "beam expander," and the expanded cross-section of the channel acts as a "beam expander": compared to light passing only through the first optical path channel 8, the coverage area of ​​the light beam increases after passing through the second optical path channel 9, thus increasing the light spot size.

[0047] Furthermore, there are multiple ways to connect the focusing rod 7 to the second lens 5. For example, the focusing rod 7 can be set along the optical axis, and the first end of the focusing rod 7 can be fixedly connected to the second lens 5 or the second lens holder 6 through the connector 11. An adjustment groove is provided on the first focusing cylinder 1 along the optical axis, and the adjustment groove and the connector 11 are slidably connected in the optical axis direction. This allows the focusing rod 7 to move in the direction of the light-inlet end of the first focusing cylinder 1 when the operator moves the focusing rod 7 towards and away from the light-inlet end of the first focusing cylinder 1. The focusing rod 7 will drive the second lens 5 to move in the first focusing cylinder 1 through the connector 11, thereby changing the distance between the first lens 3 and the second lens 5 and achieving focusing. The connector 11 and the second lens 5 or the second lens holder 6 can be detachably fixed or non-detachably fixed. When the connector 11 and the second lens 5 or the second lens holder 6 are detachably fixed, when replacing the connector 11 and / or the focusing rod 7, it is only necessary to remove the connector 11 from the second lens 5 or the second lens holder 6. It is not necessary to disassemble the first focusing cylinder 1 as a whole, which simplifies the disassembly and assembly steps of the focusing rod 7. When the connector 11 is connected to the second lens 5, it is connected to the edge area of ​​the second lens 5 to prevent the connector 11 from obstructing the end face of the second lens 5. According to user requirements, the connector 11 and the focusing rod 7 can be detachable or non-detachable. The connector 11 can be a connecting block or a connecting rod, etc. Alternatively, the connector 11 can be omitted. In this case, the first end of the focusing rod 7 is directly connected to the second lens 5 or the second lens mount 6. As needed, the first end of the focusing rod 7 can include only the end of the first end of the focusing rod 7, or the first end of the focusing rod 7 can include the end of the first end of the focusing rod 7 and the area on the focusing rod 7 near the first end of the focusing rod 7.

[0048] When the focusing rod 7 is connected to the second lens 5 or the second lens mount 6 via the connector 11, the connector 11 and the focusing rod 7 can be threaded together. In this case, the connector 11 can also be called a "lead screw nut," and the focusing rod 7 can be called a "lead screw." Since the connector 11 is restricted by the slide groove 10 and cannot rotate, it can only move along the slide groove 10. Therefore, when the operator rotates the focusing rod 7, the connector 11 will drive the second lens 5 to move within the first focusing cylinder 1 along the optical axis direction and in the opposite direction, thereby adjusting the distance between the first lens 3 and the second lens 5. Alternatively, as shown in Figures 1 to 3, several spiral grooves can be provided on the focusing rod 7, and the connector 11 can be slidably connected along the spiral direction of the spiral grooves. In this case, when the operator rotates the focusing rod 7, the connector 11 will move within the spiral grooves, driving the second lens 5 to move within the first focusing cylinder 1 along the optical axis direction and in the opposite direction.

[0049] The method of moving the focusing rod 7 axially, thereby moving the second lens 5, can only adjust the spot diameter from 8mm to 12mm and from 12mm to 16mm, which is a large adjustment range. In contrast, when the connecting piece 11 is threadedly connected to the focusing rod 7, or when the spiral groove on the focusing rod 7 is slidably connected to the connecting piece 11 in the extension direction of the spiral groove, the operator can achieve a more precise adjustment of the spot size, i.e., "stepless adjustment", by controlling the number of rotations and the angle of rotation of the focusing rod 7. By controlling the angle of rotation of the focusing rod 7, the spot diameter can be adjusted from 8mm to 8.5mm and from 10.5mm to 11mm. Furthermore, a scale can be marked on the end of the operating end of the focusing rod 7, and an indicator ring can be fitted on the operating end. The indicator ring is rotatably connected to the operating end, and a pointer extending radially is provided on the indicator ring. When the operator rotates the focusing rod 7, the focusing rod 7 rotates relative to the pointer, thereby causing the pointer to point to different scales, making it easier for the operator to determine the rotation angle and number of rotations of the focusing rod 7.

[0050] Furthermore, as shown in Figures 1 to 3, the first focusing cylinder 1 is fixed with a first support 12 and a second support 13. The focusing rod 7 passes through the first support 12 and the second support 13 and is rotatably connected to the first support 12 and the second support 13 respectively. Specifically, a bearing can be set between the first support 12 and the focusing rod 7, and a bearing can be set between the second support 13 and the focusing rod 7 to achieve the rotatable connection. Through the first support 12 and the second support 13, the displacement of the focusing rod 7 in the radial direction is reduced, and the probability of the focusing rod 7 tilting during focusing is reduced. Moreover, the diameter of the area of ​​the focusing rod 7 between the first support 12 and the second support 13 is larger than the inner diameter of the first support 12 and the second support 13. Therefore, even if the focusing rod 7 is pulled axially, the focusing rod 7 will be prevented from moving by the second support 13 and the first support 12. This reduces the problem that the distance between the first lens 3 and the second lens 5 will change when the focusing rod 7 is accidentally touched by other structures when focusing is not required. Meanwhile, by setting the type of the first lens 3 and the second lens 5, and adjusting the slide groove 10, the length of the first focusing cylinder 1 and the second focusing cylinder 2, the diameter of the formed light spot can be between 8 and 24 mm.

[0051] Furthermore, a support plate 14 is fixed below the first support seat 12 and the second support seat 13. The support plate 14 supports the first support seat 12 and the second support seat 13. There is a sufficiently large gap between the support plate 14 and the focusing rod 7 to ensure that the focusing rod 7 can rotate smoothly.

[0052] As shown in Figure 4, the positioning component includes several detection elements 15 spaced apart along the optical axis, and a positioning element 17 disposed on the second lens 5 or the second lens mount 6. The positioning element 17 is located within the detection range of the detection elements 15. The detection elements 15 are connected to a controller. Specifically, the detection elements 15 can be Hall sensors, and the positioning element 17 can be a ferromagnetic metal structure disposed on the second lens 5 or the second lens mount 6. When the second lens 5 moves to the desired position, because the Hall sensor contains semiconductor elements, the ferromagnetic metal structure will generate a transverse voltage (Hall voltage) in the semiconductor material. The magnitude of this voltage is proportional to the magnetic field strength. That is to say, the Hall sensor corresponding to the position of the second lens 5 at this time will have its magnetic field enhanced under the excitation of the ferromagnetic metal structure, generating a high level, and then transmitting the signal back to the controller, such as an MCU (MCU refers to a microcontroller, such as a single-chip microcomputer). The controller determines the distance between the first lens 3 and the second lens 5, as well as the size of the light spot, based on the position of the second lens 5. At this time, the focusing rod 7 can be made of non-metallic materials such as plastic to avoid interfering with the Hall sensor's recognition of the second lens 5. Alternatively, the Hall sensor and ferromagnetic metal structure can be omitted, and several infrared rangefinders connected to the controller signal can be set on the second lens mount 6. However, it should be noted that in this case, the infrared rangefinders are set on the second lens mount 6 in an area that does not obstruct the second lens 5.

[0053] Alternatively, the positioning component may not employ the aforementioned structure. In this case, the first lens group includes a first lens 3, the second lens group includes a second lens 5, and the positioning component includes an indicator disposed on the second lens 5 or the second lens holder 6. The indicator extends out of the first focusing cylinder 1 and is slidably connected to the slide groove 10 in the optical axis direction. The first focusing cylinder 1 is provided with a scale line arranged along the optical axis direction, and the indicator is positioned facing the scale line. The scale line is located on the movement trajectory of the indicator. When the operator moves the second lens 5 within the first focusing cylinder 1 by adjusting the focusing rod 7, the indicator moves along the scale line, pointing to different scales, so that the operator can clearly see the change in distance between the first lens 3 and the second lens 5. The indicator may specifically be an indicator rod or an indicator needle, or other structure that can point to the scale.

[0054] It should be noted that, to facilitate focusing of the focusing equipment, the first lens group may consist of only one first lens holder 4 and one first lens 3, and the second lens group may consist of only one second lens holder 6 and one second lens 5. Alternatively, if required by the operating conditions, multiple first lens holders 4, first lenses 3, second lens holders 6, and second lenses 5 may be provided. In this case, several sliding grooves 10 may be provided on the first focusing cylinder 1 to respectively position each second lens 5.

[0055] Furthermore, the focusing device in this invention includes a protective cover, the interior of which has a cavity. Inside the cavity are a first focusing cylinder 1, a focusing assembly, and a positioning assembly. Alternatively, when the first focusing cylinder 1 is connected to a second focusing cylinder 2, the second focusing cylinder 2 is also located inside the protective cover. The protective cover isolates the external environment from the first focusing cylinder 1, the focusing assembly, and the positioning assembly, reducing the contact area between these structures and the outside environment. This reduces the probability of dust and other impurities accumulating on the first focusing cylinder 1, the focusing assembly, and the positioning assembly, leading to reduced spot adjustment efficiency and a smaller spot size. Additionally, the protective cover has access ports respectively connected to both ends of the first optical path channel 8. When the first focusing cylinder 1 is connected to the second focusing cylinder 2, the light inlet is connected to the light inlet end of the first optical path channel 8, and the light outlet is connected to the light outlet end of the second optical path channel 9, so that light can pass through the first optical path channel 8 and the second optical path channel 9, or at least pass through the first optical path channel 8 to form a light spot. The operating end extends out to form a protective cover, and a sealing ring or other sealing element is provided between the protective cover and the focusing rod 7. This improves the sealing performance of the protective cover, making it less likely for external dust and other impurities to come into contact with the first focusing cylinder 1, the focusing assembly, the positioning assembly, and other structures. Thus, while improving the dustproof performance of the first focusing cylinder 1, the focusing assembly, the positioning assembly, and other structures, it also ensures the normal operation of the focusing equipment.

[0056] The focusing device also includes a limiting component, which includes a plurality of first positioning holes spaced apart along the circumference of the first focusing cylinder 1 on the first focusing cylinder 1. The second lens group includes a second lens holder 6, which slides with the first focusing cylinder 1 in the optical axis direction. The second lens holder 6 contains a second lens 5, and the second lens holder 6 has a plurality of second limiting holes corresponding to the first limiting holes along its circumference. The limiting component also includes a limiting member. When the second lens 5 reaches the preset position, the focal length adjustment between the first lens 3 and the second lens 5 is completed. The limiting member is then passed through the corresponding first limiting holes and second limiting holes in sequence, thereby fixing the second lens holder 6 and the first focusing cylinder 1 together. When the second lens 5 needs to be moved, the limiting member is removed to release the locking of the limiting member on the second lens 5 until the second lens 5 reaches the preset position (the preset position means that when the second lens 5 is in the preset position, the distance between the first lens 3 and the second lens 5 is the required distance). The limiting component allows the second lens 5 to move within the first focusing cylinder 1, adjusting the distance between the first lens 3 and the second lens 5 while reducing the offset of the second lens 5 after reaching the preset position, thus ensuring the quality of the light spot formation. Furthermore, a plug can be inserted into the first limiting hole on the first focusing cylinder 1 where no limiting component is placed to seal it, preventing external dust and other impurities from entering the first focusing cylinder 1 through the exposed first limiting hole, which would result in poor light spot formation quality. Specifically, the plug can be a rod-shaped structure that is interference-fitted with the first limiting hole or a screw threaded to the first limiting hole.

[0057] The length of the limiting member is not less than the sum of the depths of the first limiting hole and the second limiting hole, so as to ensure that the limiting member can pass through the first limiting hole and abut against the second limiting hole. The limiting member can be a bolt or a screw. In this case, the first limiting hole and the second limiting hole are provided with threaded sections that can be threadedly connected to the limiting member; or, the limiting member is a pin, and the first limiting hole and the second limiting hole are pin holes that mate with the pin. The pin hole and the pin can be an interference fit.

[0058] Furthermore, this utility model also provides a therapeutic device, which includes the aforementioned focusing device and a light source for supplying light to the focusing device, as shown in Figures 1 to 3. The end of the first focusing cylinder 11 furthest from the second focusing cylinder 2 is connected to a connector 16 for connecting the first focusing cylinder 11 to the light source. The connector and the first focusing cylinder 11 can be connected by a threaded connection or a bolt connection. A drive component for moving the overall structure of the focusing device, such as a rotary motor or an electric push rod, is also provided. The therapeutic device can be used in the field of scar removal and other skin repair. When the therapeutic device uses the focusing device of this utility model, an indicator light, or guide light, can first be provided to the first optical path channel 8 and the second optical path channel 9 through the first light source. The indicator light is cold light, and a light source capable of providing light at a temperature of zero degrees Celsius can be selected as the first light source. After ensuring that the light spot formed by the indicator light is aligned with the area of ​​the user requiring scar removal or other repair, the first light source is turned off, and the second light source is turned on. The second light source, through the light spot formed by the first optical path channel 8 and the second optical path channel 9, performs scar removal and other skin repair on the user. The second light source can be a thermal light source with the required temperature.

[0059] In this document, "several" refers to at least one. "And / or" in this document refers to the text content preceding "and / or", and the text content following "and / or" can exist simultaneously or separately. For example, "A and / or B" includes the case where only A or B exists, as well as the case where A and B exist simultaneously.

[0060] This utility model discloses multiple technical solutions, but does not provide any contrary technical teachings. Any content not covered in this utility model is applicable to existing technologies.

[0061] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A focusing device, characterized in that, The focusing device includes: a first focusing tube, wherein a first optical path channel is provided inside the first focusing tube along the optical axis and extending through the first focusing tube, the first optical path channel being used for light to pass through; a first lens group and a second lens group, the first lens group and the second lens group being disposed inside the first focusing tube, the first lens group including a plurality of first lenses arranged along the optical axis and fixedly connected to the first focusing tube, the second lens group including a plurality of second lenses arranged along the optical axis and slidably connected to the first focusing tube along the optical axis, and the first lenses and the second lenses being matched so that light can form a light spot after passing through the first optical path channel; a focusing assembly, the focusing assembly including a focusing rod, the first end of the focusing rod extending into the first focusing tube and connected to the second lens, the second end of the focusing rod being located outside the first focusing tube and forming an operating end for an operator to adjust the focusing rod; and a positioning assembly, the positioning assembly being disposed on the second lens and used to detect the distance between the first lens and the corresponding second lens.

2. The focusing device according to claim 1, characterized in that, The focusing device further includes a second focusing cylinder connected to the first focusing cylinder. The second focusing cylinder is provided with a second optical path channel that is connected to the first optical path channel. The second optical path channel passes through the second focusing cylinder, and the first optical path channel and the second optical path channel are arranged sequentially and connected along the optical axis.

3. The focusing device according to claim 2, characterized in that, Both the first optical path channel and the second optical path channel have a fixed cross-section structure, and the cross-sections of the first optical path channel and the second optical path channel are the same; or, the cross-section of the second optical path channel gradually expands along the optical axis.

4. The focusing device according to claim 1, characterized in that, The first lens group and the second lens group are arranged sequentially along the optical axis, or the first lens and the second lens are arranged alternately along the optical axis.

5. The focusing device according to claim 1, characterized in that, The focusing rod is arranged along the optical axis and connected to the second lens via a connector; the focusing assembly further includes a sliding groove provided on the first focusing cylinder and opened along the optical axis, the sliding groove and the connector being slidably connected in the optical axis direction; wherein, the connector is threadedly connected to the focusing rod, or, the focusing rod is provided with a spiral groove, the spiral groove and the connector being slidably connected along the extension direction of the spiral groove.

6. The focusing device according to claim 1, characterized in that, The positioning component includes a plurality of detection elements arranged along the optical axis, and a positioning element disposed on the second lens. The positioning element is located within the detection range of the detection elements, and the detection elements are signal-connected to a controller.

7. The focusing device according to claim 1, characterized in that, The first lens group includes a first lens, the second lens group includes a second lens, and the second lens is provided with an indicator extending from the first focusing tube. The first focusing tube is provided with a scale line arranged along the optical axis, the indicator is arranged toward the scale line, and the scale line is located on the movement trajectory of the indicator.

8. The focusing device according to claim 1, characterized in that, The focusing device includes a protective cover, and the cavity of the protective cover is provided with the first focusing cylinder, the focusing component and the positioning component; the protective cover is provided with a light inlet hole and a light outlet hole respectively connected to the two ends of the first optical path channel, and the operating end extends out of the protective cover, and a sealing element is provided between the protective cover and the focusing rod.

9. The focusing device according to claim 1, characterized in that, The focusing device further includes a limiting component, which includes: a plurality of first limiting holes disposed on the first focusing cylinder and arranged circumferentially along the first focusing cylinder; a second limiting hole; the second lens group further includes a plurality of second lens seats that slide with the first focusing cylinder in the optical axis direction, the second lens seats having the second lens disposed therein, and the second lens seats having a plurality of second limiting holes corresponding to the first limiting holes circumferentially; and a limiting member, which is used to pass through the first limiting hole and the second limiting hole in sequence after the second lens seat reaches a preset position.

10. A therapeutic device, characterized in that, The therapeutic device includes the focusing device according to any one of claims 1-9.

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