Laser handpiece and laser treatment device

Abstract

This utility model discloses a laser handpiece and a laser therapy device, relating to the field of cosmetic treatment equipment technology. The laser handpiece includes a housing, a movable base, a fixed base, a fixed lens, a movable lens, and a shifting mechanism. The movable base is movably connected to the housing; the fixed base is fixed to the housing; the movable lens is fixed to the movable base, and the fixed lens is fixed to the fixed base. The shifting mechanism includes a push button, a rack, and a gear assembly. The push button is movably connected to the outside of the housing, and one end of the push button extends into the housing and connects to the rack. The rack and the movable base are respectively connected to the gear assembly for transmission. The technical solution provided by this utility model transmits power to the movable base through the push button and rack-driven gear assembly, allowing the user to adjust the lens by pushing the push button with their finger while holding the handpiece, achieving single-handed adjustment of the light spot size.

Description

Technical Field

[0001] This utility model relates to the field of cosmetic treatment equipment technology, and in particular to a laser hand and a laser treatment device. Background Technology

[0002] Existing laser treatment equipment typically features a simple handpiece structure, usually consisting of a fixed lens inside a sleeve and a movable lens inside a telescope barrel. Both the fixed and movable lenses are located on the optical axis. By rotating the telescope barrel, the movable lens moves along the optical axis, thereby adjusting the distance between it and the fixed lens, and thus adjusting the size of the output light spot.

[0003] However, this adjustment requires the user to hold the lens barrel and the telescope tube with both hands respectively, which is inconvenient. Utility Model Content

[0004] The main purpose of this invention is to propose a laser handpiece and a laser therapy device, which aims to enable the adjustment of the light spot size by moving a lens with just one hand.

[0005] To achieve the above objectives, this utility model proposes a laser handpiece, which includes:

[0006] case;

[0007] A movable base, which is movably connected to the housing;

[0008] The fixing base is fixed inside the housing;

[0009] A fixed lens is fixed to the mounting base;

[0010] A movable lens, wherein the movable lens is fixed on the movable base; and

[0011] A gear shifting mechanism, comprising a push-gear button, a rack and a gear assembly, wherein the push-gear button is movably connected to the outside of the housing, and one end of the push-gear button extends into the housing and is connected to the rack, and the rack and the movable seat are respectively connected to the gear assembly for transmission.

[0012] The push button drives the rack to rotate the gear assembly, so that the movable seat can move relative to the fixed seat to adjust the distance between the fixed lens and the movable lens.

[0013] In one embodiment, the gear assembly includes:

[0014] Gear, which meshes with the rack; and

[0015] A shift wheel is coaxially connected to the gear and has a guide groove; one end of the movable seat is movably connected to the guide groove and the other end of the movable seat is connected to the movable lens;

[0016] The push button drives the rack so that the gear drives the shift wheel to rotate, so that the moving lens is guided by the rotating guide groove to make a reciprocating linear motion.

[0017] In one embodiment, the guide groove is an involute guide groove;

[0018] Alternatively, the guide groove is a spiral guide groove, and the guide groove is spaced apart from the center of the shift wheel.

[0019] In one embodiment, the movable seat includes:

[0020] Connecting rod, one end of which is confined within the guide groove; and

[0021] The mounting part is connected to the other end of the connecting rod and has a mounting hole for mounting the movable lens.

[0022] In one embodiment, the housing has an inner cavity and a gear hole communicating with the inner cavity; the fixed base is installed in the inner cavity, the rack and the gear are both installed on the outer wall of the fixed base, the shift wheel is installed inside the fixed base, and the push-gear button is movably connected to the gear hole.

[0023] In one embodiment, the mounting base has a mounting groove, an optical path channel, a limiting groove, and a light-emitting hole. The mounting groove is connected to the limiting groove, and the light-emitting hole and the limiting groove are respectively connected to the optical path channel.

[0024] The mounting slot is used to install the shift wheel. The movable seat is movably connected to the optical path channel, and one end of the movable seat extends from the limiting slot into the guide slot so that the movable seat is connected to the shift wheel in a transmission manner. The fixed lens is installed in the optical path channel and is set away from the light outlet hole so that the movable seat drives the movable lens to move closer to or away from the light outlet hole.

[0025] In one embodiment, the laser handpiece further includes a locking component connected to the fixed base and elastically abutting against the shift wheel to lock the position of the movable lens.

[0026] In one embodiment, the fixing base is further provided with a guide groove communicating with the mounting groove; the circumferential outer wall of the shift wheel is provided with a plurality of snap-fit ​​positions, each of the snap-fit ​​positions communicating with the guide groove;

[0027] The locking component includes:

[0028] An elastic element, one end of which is connected to the wall of the guide groove; and

[0029] A stop member is connected to the other end of the elastic member and is engaged at a locking position to lock the shift wheel.

[0030] In one embodiment, the stop member is a stop ball, and the snap-fit ​​position is an arc-shaped hole.

[0031] Alternatively, the stop element may be a stop hook, and the snap-fit ​​position may be a triangular hole.

[0032] In one embodiment, the rack is provided with at least one limiting hole, and the outer wall of the housing is provided with a limiting post, which is engaged with the limiting hole to limit the range of motion of the rack.

[0033] This utility model also proposes a laser therapy device, which includes:

[0034] Host; and

[0035] The laser handpiece described above is connected to the host computer.

[0036] The laser handpiece of this utility model includes a housing, a movable base movable within the housing, a fixed base fixed within the housing, a fixed lens and a movable lens respectively connected to the fixed base and the movable base, and a shifting mechanism composed of a push button, a rack, and a gear assembly. The push button is exposed outside the housing and connected to the rack. The rack and the movable base are respectively connected to the gear assembly for transmission. Pushing the push button drives the rack to rotate, thereby driving the movable base to move relative to the fixed base to adjust the distance between the two lenses. By transmitting power to the movable base through the push button and the rack-driven gear assembly, the laser spot size can be adjusted by pushing the push button with the fingers while holding the housing, greatly improving the convenience of operation. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0038] Figure 1 A partial structural view of the laser handpiece provided by this utility model from one perspective;

[0039] Figure 2 for Figure 1 AA section view;

[0040] Figure 3 for Figure 2 A magnified view of section B;

[0041] Figure 4 A partial structural diagram of the laser handpiece provided by this utility model from another perspective;

[0042] Figure 5 for Figure 4 Sectional view at CC;

[0043] Figure 6 A partial structural diagram of the laser handpiece provided by this utility model from another perspective;

[0044] Figure 7 for Figure 6 Sectional view at DD in the middle;

[0045] Figure 8 An overall perspective view of the laser handpiece provided by this utility model;

[0046] Figure 9 A partial cross-sectional view of the laser handpiece provided by this utility model from one perspective.

[0047] Explanation of icon numbers:

[0048] 10. Housing; 10a. Gear hole; 10b. Limiting post; 20. Moving seat; 21. Connecting rod; 22. Mounting part; 30. Fixed seat; 30a. Mounting groove; 30b. Optical path channel; 30c. Limiting groove; 30d. Light outlet hole; 30e. Guide groove; 40. Moving lens; 50. Gear shifting mechanism; 51. Push button; 52. Rack; 52a. Limiting hole; 53. Gear assembly; 531. Gear; 532. Gear shifting wheel; 532a. Guide groove; 532b. Snap-fit ​​position; 60. Locking assembly; 61. Elastic element; 62. Stop element.

[0049] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0050] 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 scope of protection of the present utility model.

[0051] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0052] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0053] Therefore, please refer to Figures 1 to 3 and Figure 8 This application discloses a laser handpiece, comprising a housing 10, a movable base 20 movably connected within the housing 10, a fixed base 30 fixed within the housing 10, a movable lens 40 and a fixed lens respectively mounted on the movable base 20 and the fixed base 30, and a shifting mechanism 50 including a push button 51, a rack 52, and a gear assembly 53. The push button 51 is externally located within the housing 10 and is driven by the rack 52 and the gear assembly 53, which is simultaneously connected to the movable base 20. The push button 51 drives the rack 52 to rotate the gear assembly 53, causing the movable base 20 to move relative to the fixed base 30, thereby adjusting the distance between the two lenses.

[0054] In this embodiment, the housing 10 refers to the support structure that houses the various functional components. Specifically, it can be implemented as a split injection-molded housing 10, with an internal guide rail structure to constrain the movement trajectory of the movable seat 20. The movable seat 20 refers to the moving component that carries the movable lens 40. Specifically, it can be slidably connected to the housing 10 via a slide rail, and its movement direction remains parallel to the optical axis. The fixed seat 30 refers to the base fixed inside the housing 10 for mounting and fixing the lens. Specifically, it can be injection-molded with metal inserts to improve structural stability. The shifting mechanism 50 refers to the transmission component that realizes the conversion of movement. The push button 51 is connected to the rack 52, and the gear assembly 53 meshes with the rack 52. The gear assembly 53 drives the movable seat 20 to move.

[0055] Specifically, when the push button 51 is pressed, the rack 52 moves in a straight line, causing the gear assembly 53 to rotate. The rotation of the gear assembly 53 constrains the connecting end of the movable seat 20. During the rotation of the gear assembly 53, the movable seat 20 is forced to perform a linear reciprocating motion, moving linearly towards or away from the fixed lens to adjust the distance between the fixed lens and the movable lens 40. This linear motion direction coincides with the optical axis, causing a change in the distance between the movable lens 40 and the fixed lens, thereby adjusting the beam diameter.

[0056] Compared to two-hand rotation, single-hand push-block operation simplifies the adjustment steps, making the operation more convenient. It allows the operator to keep the treatment head stable, making it easier to observe changes in the light spot in real time, while ensuring the stability of the treatment head during the operation.

[0057] Please see Figures 1 to 3 and Figure 9 This application further proposes a laser handpiece comprising a housing 10, a movable base 20, a fixed base 30, a fixed lens, a movable lens 40, and a shifting mechanism 50. The shifting mechanism 50 includes a push button 51, a rack 52, and a gear assembly 53. The push button 51 is movably connected to the outside of the housing 10, and one end of the push button 51 extends into the housing 10 and connects to the rack 52. The rack 52 and the movable base 20 are respectively connected to the gear assembly 53 for transmission. The gear assembly 53 includes a gear 531 and a shift wheel 532. The gear 531 meshes with the rack 52, and the shift wheel 532 is coaxially connected to the gear 531. The shift wheel 532 has a guide groove 532a. One end of the movable base 20 is movably connected to the guide groove 532a, and the other end of the movable base 20 is connected to the movable lens 40. The push button 51 drives the rack 52 and gear 531 to rotate the shift wheel 532, so that the moving lens 40 is guided by the rotating guide groove 532a to make a reciprocating linear motion. It should be noted that the product corresponding to this solution has many internal structural components. For the convenience of directly understanding the solution related to this application, some structural components that are not related to this solution are not shown in some of the product drawings.

[0058] In this embodiment, gear 531 refers to a rotating component that meshes with rack 52 and transmits thrust. Specifically, it can be implemented using helical or spur gears, used to convert the linear motion of rack 52 into rotational motion. Shift wheel 532 refers to a disc structure coaxially mounted with gear 531 and equipped with a guide groove 532a. Specifically, it can be injection molded or machined. Its guide groove 532a is used to constrain the movement trajectory of the moving seat 20. Gear 531 has a mounting groove 30a on the side facing shift wheel 532. Shift wheel 532 includes a connecting shaft and a disc. The connecting shaft is coaxially connected to the disc and is inserted into the mounting groove 30a, and is coaxially connected to gear 531. Guide groove 532a refers to a groove with a specific shape formed on the surface of shift wheel 532 facing away from gear 531. Specifically, it can be an involute or helical design. The conversion from rotational motion to linear motion is achieved through the contact between the groove wall and the moving seat 20.

[0059] Specifically, when the shift button 51 is pressed, the rack 52 moves in a straight line and drives the gear 531 to rotate through the meshing teeth. The shift wheel 532, coaxial with the gear 531, rotates accordingly. One end of the moving base 20 is embedded in the guide groove 532a of the shift wheel 532. As the shift wheel 532 rotates, the contour of the guide groove 532a forces the moving base 20 to reciprocate in a straight line along the optical path channel 30b, thereby moving the moving lens 40 closer to or away from the fixed lens. Since the movement trajectory of the moving base 20 is completely controlled by the geometry of the guide groove 532a, the wobbling problem caused by the meshing gap between the gear 531 and the rack 52 is avoided. For example, when the guide groove 532a is spiral, the moving base 20 generates a corresponding linear displacement for every certain angle the shift wheel 532 rotates, achieving precise focus adjustment.

[0060] This solution, through the cooperation of the shift wheel 532 and the guide groove 532a, eliminates the backlash interference in the transmission chain when converting rotary motion into linear motion. The moving seat 20 is only rigidly constrained by the guide groove 532a, and the straightness and stability of the motion path are significantly improved.

[0061] Through the above technical solution, this application solves the problem of lens wobbling caused by the gap between gear 531 and rack 52 in existing laser handpieces, and realizes high-precision linear motion of the moving lens 40. The operator can complete multi-level adjustment by pushing the push button 51 with one hand. The moving seat 20 moves smoothly along a fixed path under the guidance of the guide groove 532a, ensuring that the optical path remains stable during the adjustment of the spot diameter, and meeting the stringent requirements of laser treatment equipment for focusing stability.

[0062] Please see Figures 1 to 5This application further proposes that the guide groove 532a is an involute guide groove 532a; or the guide groove 532a is a spiral guide groove 532a, and the guide groove 532a is spaced apart from the center of the shift wheel 532.

[0063] In this embodiment, the involute guide groove 532a refers to a continuous groove structure formed based on an involute curve, which can be achieved by machining or molding. Its curvature change can keep the movement trajectory of the connecting rod 21 smooth. The spiral guide groove 532a refers to a groove structure that extends spirally along the circumference of the shift wheel 532. Specifically, the stroke of the moving seat 20 can be adjusted by setting the helix angle parameter. The spiral guide groove 532a and the center of the shift wheel 532 are spaced apart to form an eccentric movement path.

[0064] Specifically, when the shift wheel 532 is driven to rotate by the gear 531, the involute guide groove 532a applies a linear guiding force to the connecting rod 21 through the groove wall with continuously changing curvature, causing the moving seat 20 to produce a uniform displacement along the axis of the optical path channel 30b. For the helical guide groove 532a, due to the offset between the groove center and the rotation center of the shift wheel 532, during the rotation of the shift wheel 532, the connecting rod 21 is constrained by the eccentric helical groove, driving the moving lens 40 to complete a periodic reciprocating linear motion along the optical path channel 30b. Both types of guide grooves 532a convert rotational motion into linear displacement through geometric design, avoiding the unstable motion caused by meshing backlash in traditional gear and rack transmissions.

[0065] This solution converts rotational motion into linear motion using an involute or eccentric helical guide groove 532a, and eliminates motion transmission gaps by utilizing the continuous contact between the groove wall and the connecting rod 21. Compared to the linear rack and pinion structure 52, the gradual curvature of the involute guide groove 532a can reduce sudden acceleration changes during motion, while the eccentric helical groove achieves long-stroke motion within a compact space through an asymmetric path design.

[0066] Through the above technical solution, this application can effectively reduce the positional shift of the moving lens 40 during the focusing process and avoid the problem of unstable laser spot focusing caused by transmission gap. The involute guide groove 532a is suitable for scenarios requiring uniform linear motion, while the eccentric spiral guide groove 532a is more advantageous in achieving a large range of displacement adjustment within a limited space. Both implementations ensure that the moving lens 40 moves smoothly along the predetermined trajectory through mechanical structure optimization.

[0067] Please see Figure 3 and Figure 5This application further proposes that the movable base 20 includes a connecting rod 21 and a mounting part 22. One end of the connecting rod 21 is limited to the guide groove 532a, and the mounting part 22 is connected to the other end of the connecting rod 21 and is provided with a mounting hole for mounting the movable lens 40.

[0068] In this embodiment, the connecting rod 21 is a transmission component used to convert the rotational motion of the shift wheel 532 into linear motion. Specifically, it can be implemented using a cylindrical metal rod, one end of which is embedded in the guide groove 532a through a sliding fit. This allows the connecting rod 21 to generate axial displacement through the contour change of the guide groove 532a when the shift wheel 532 rotates. The mounting part 22 is a support structure used to fix the movable lens 40. Specifically, it can be implemented using an aluminum alloy block with stepped holes. The inner wall of the stepped holes is provided with threads or snap-fit ​​structures to adapt to lenses of different specifications. The mounting part 22 and the connecting rod 21 are rigidly connected by welding or threaded fastening.

[0069] Specifically, when the shift wheel 532 is driven to rotate by the gear 531, the specific trajectory of the guide groove 532a forces the connecting rod 21 to reciprocate along the axis of the optical path channel 30b. The mounting part 22 synchronizes the movement of the moving lens 40 with that of the connecting rod 21 through a rigid connection, so that the lens moves along a straight trajectory within the optical path channel 30b. The limiting fit between the connecting rod 21 and the guide groove 532a eliminates radial offset during the movement, and the mounting part 22 ensures that the optical axis of the lens always coincides with the axis of the optical path channel 30b through a stepped hole structure.

[0070] This solution converts rotational motion into linear motion without lateral clearance through the rigid fit between the connecting rod 21 and the guide groove 532a. The axial constraint of the mounting part 22 and the optical path channel 30b further suppresses radial sway during the motion.

[0071] Please see Figures 1 to 3 This application further proposes that the housing 10 of the laser handpiece has an inner cavity and a stop hole 10a communicating with the inner cavity; the fixed base 30 is installed in the inner cavity, the rack 52 and the gear 531 are both installed on the outer wall of the fixed base 30, the shift wheel 532 is installed in the fixed base 30, and the push button 51 is movably connected to the stop hole 10a.

[0072] In this embodiment, the gear shift hole 10a refers to a through hole opened on the housing 10 to accommodate the movement trajectory of the push-gear button 51. Specifically, it can be implemented using a circular or rectangular hole structure. Its function is to limit the movement range of the push-gear button 51 and ensure operational stability. The inner cavity refers to the space inside the housing 10 used to accommodate the fixed seat 30 and the shift wheel 532. Specifically, it can be formed by splicing together split housings 10. Its function is to achieve positional constraints and integrated layout of various components.

[0073] Specifically, the fixed base 30 is fixed to the inner cavity of the housing 10 by screws or clips. The rack 52 and gear 531 are respectively mounted on the outer wall of the fixed base 30, and are rotatably connected, for example, by a pin or bearing. The shift wheel 532 is embedded inside the fixed base 30, and is linked to the gear 531, for example, by a coaxial connection. One end of the push button 51 extends into the housing 10 through the gear position hole 10a and is connected to the middle of the rack 52 by a pin or slot. When the push button 51 slides along the gear position hole 10a, the rack 52 drives the gear 531 to rotate, which in turn drives the shift wheel 532 to rotate, and finally controls the linear movement of the moving base 20 through the guide groove 532a. During this process, the gear position hole 10a physically limits the movement trajectory of the push button 51 to avoid transmission errors caused by operational deviations.

[0074] This application mounts the rack 52 and gear 531 on the outer wall of the fixed base 30 and embeds the shift wheel 532 inside the fixed base 30, thereby rigidly constraining the motion freedom of the transmission system by the fixed base 30, effectively reducing the relative displacement between components. Furthermore, the precise positioning of the shift hole 10a on the push-gear button 51 further reduces unintended deviations during operation.

[0075] Please see Figure 3 , Figure 6 and Figure 7 This application further proposes that the fixed base 30 has a mounting groove 30a, an optical path channel 30b, a limiting groove 30c, and a light-emitting hole 30d. The mounting groove 30a is connected to the limiting groove 30c, and the light-emitting hole 30d and the limiting groove 30c are respectively connected to the optical path channel 30b. The mounting groove 30a is used to install the shift wheel 532. The movable base 20 is movably connected in the optical path channel 30b, and one end of the movable base 20 extends from the limiting groove 30c into the guide groove 532a so that the movable base 20 is connected to the shift wheel 532 in a transmission connection. The fixed lens is installed in the optical path channel 30b and is set away from the light-emitting hole 30d so that the movable base 20 drives the movable lens 40 to move closer to or away from the light-emitting hole 30d.

[0076] In this embodiment, the mounting groove 30a refers to a recessed structure for accommodating the shift wheel 532, which can be implemented as a rectangular or circular groove. Its depth matches the thickness of the shift wheel 532 to ensure that the shift wheel 532 does not shift during rotation. The optical path channel 30b refers to a hollow pipe through which the laser beam passes, which can be implemented as a cylindrical channel with polished inner walls to reduce light energy loss. The limiting groove 30c refers to a narrow groove that laterally constrains the moving seat 20. Its width is slightly larger than the diameter of the connecting rod 21 of the moving seat 20, allowing the connecting rod 21 to slide laterally along the limiting groove 30c but restricting its longitudinal displacement. The light output hole 30d refers to the opening through which the laser beam is finally output, which can be implemented as a conical hole structure. The end near the optical path channel 30b has a larger diameter to accommodate the beam divergence angle.

[0077] Specifically, the shift wheel 532 is installed in the mounting groove 30a of the fixed base 30, and its guide groove 532a corresponds to the position of the limiting groove 30c. The connecting rod 21 of the movable base 20 passes through the limiting groove 30c and is embedded in the guide groove 532a. When the shift wheel 532 rotates, the contour of the guide groove 532a forces the connecting rod 21 to move linearly along the limiting groove 30c. A fixed lens and a movable lens 40 driven by the movable base 20 are arranged sequentially in the optical path channel 30b, and the distance between them is adjusted by the linear displacement of the movable base 20. When the push button 51 drives the shift wheel 532 to rotate, the movable lens 40 is guided by the guide groove 532a to move along the optical path channel 30b towards the light output hole 30d or in the opposite direction, thereby changing the distance between the two lenses to adjust the laser focusing parameters. The fixed lens is arranged away from the light output hole 30d to ensure that the beam has completed preliminary focusing before reaching the movable lens 40, and the displacement of the movable lens 40 further adjusts the final output spot size.

[0078] This design utilizes the cooperation of the limiting groove 30c and guide groove 532a within the fixed base 30 to convert the rotational motion of the shift wheel 532 into the pure linear motion of the moving base 20, eliminating the instability caused by the transmission backlash of the gear 531 and rack 52. The optical path channel 30b integrates the mounting positions of the fixed lens and the moving lens 40, forming a closed optical path structure to prevent external dust from contaminating the optical components. The dual constraint of the limiting groove 30c and guide groove 532a ensures that the moving base 20 can only move in a single direction, guaranteeing the linear accuracy of the lens displacement trajectory.

[0079] Please see Figure 3 , Figure 6 and Figure 7 This application further proposes a laser handpiece including a locking component 60, which is connected to the fixed base 30 and elastically abuts against the shift wheel 532 to lock the position of the movable lens 40.

[0080] In this embodiment, the locking component 60 refers to a device that restricts the rotation of the shift wheel 532 through a mechanical structure. Specifically, it can be achieved by the cooperation of an elastic element 61 and a stop element 62, such as a combination of a spring and a steel ball. Elastic contact refers to the use of elastic force to keep the stop element 62 in contact with the shift wheel 532. Specifically, the rebound force generated by a compressed spring can be used to press the stop element 62 into the locking position 532b of the shift wheel 532. This design, through the cooperation of elastic force and the locking structure, fixes the shift wheel 532 at a specific angle, thereby eliminating the positional offset problem of the moving lens 40 caused by the transmission backlash of the gear 531.

[0081] Specifically, when the shift wheel 532 rotates to the target position, the stop member 62, pushed by the elastic member 61, engages with the corresponding locking position 532b of the shift wheel 532. At this time, the shift wheel 532 cannot rotate freely, and the position of the moving lens 40 is locked. For example, when the operator pushes the shift button 51 to adjust the spot diameter, the locking component 60 automatically fixes the shift wheel 532, preventing the moving lens 40 from shifting due to the meshing gap between the gear 531 and the rack 52 or external vibration. During this process, the compression amount of the elastic member 61 can be set according to the actual situation, so that a stable interference fit is formed between the stop member 62 and the locking position 532b, while ensuring that the operating force required for the shift wheel 532 to switch gears is within a reasonable range.

[0082] This solution uses locking component 60 to physically limit the shift wheel 532, rigidly fixing the moving lens 40 after adjustment. This eliminates the need for the self-locking capability of the gear transmission system, thus preventing positioning errors caused by transmission backlash. In laser treatment scenarios, after the operator pushes the button with one hand to complete focusing, locking component 60 immediately takes effect, maintaining the lens position without additional operation and effectively ensuring treatment accuracy.

[0083] Please see Figure 3 , Figure 6 and Figure 7 This application further proposes that the fixed base 30 is also provided with a guide groove 30e communicating with the mounting groove 30a; the circumferential outer wall of the shift wheel 532 is provided with a plurality of snap-fit ​​positions 532b, each snap-fit ​​position 532b communicating with the guide groove 30e; the locking assembly 60 includes an elastic member 61 and a stop member 62, one end of the elastic member 61 is connected to the groove wall of the guide groove 30e, and the stop member 62 is connected to the other end of the elastic member 61 and snapped into a snap-fit ​​position 532b.

[0084] In this embodiment, the guide groove 30e refers to a groove structure communicating with the mounting groove 30a, specifically a long strip-shaped groove, used to accommodate the locking component 60 and guide the locking component 60 to move along its extension direction. The engaging position 532b refers to multiple holes provided on the circumferential outer wall of the shift wheel 532, specifically equally spaced arc-shaped or triangular grooves, used to form a positioning fit with the stop member 62. The elastic element 61 refers to an elastic element with a reset function, specifically a coil spring or a spring sheet, used to apply continuous pressure to the stop member 62. The stop member 62 refers to a positioning component used to limit the rotation of the shift wheel 532, specifically a metal ball or a plastic hook, forming a stable engagement with the engaging position 532b through elastic pressure.

[0085] Specifically, when the shift wheel 532 rotates, the stop member 62 moves along the guide groove 30e under the push of the elastic member 61. When the shift wheel 532 rotates to the target angle, the stop member 62 automatically engages with the corresponding locking position 532b, at which point the shift wheel 532 stops rotating due to mechanical obstruction. Since the moving seat 20 is linked to the guide groove 532a of the shift wheel 532 via the connecting rod 21, the position locking of the shift wheel 532 directly restricts the axial displacement of the moving lens 40. During this process, the pressure continuously applied by the elastic member 61 keeps the stop member 62 in close contact with the locking position 532b, preventing accidental displacement due to vibration or external force.

[0086] Compared with existing technologies, traditional focusing mechanisms lack an effective mechanical positioning structure, relying solely on the meshing of gears 531 and racks 52 to maintain position, which is prone to lens wobbling due to meshing gaps. This solution, through the synergistic action of elastic element 61 and stop element 62, forms multiple positioning points on the shift wheel 532, enabling the moving lens 40 to achieve rigid locking after position adjustment, eliminating instability caused by transmission gaps.

[0087] Please see Figure 3 , Figure 6 and Figure 7 This application further proposes a locking component 60 including an elastic member 61 and a stop member 62. One end of the elastic member 61 is connected to the groove wall of the guide groove 30e, and the stop member 62 is connected to the other end of the elastic member 61 and engaged at the engagement position 532b to lock the shift wheel 532. The stop member 62 is a stop ball, and the engagement position 532b is an arc hole; or the stop member 62 is a stop hook, and the engagement position 532b is a triangular hole.

[0088] The stop ball refers to a positioning element with a spherical contact structure, which can be made of metal or rigid plastic. Its spherical contact structure allows for multi-point contact with the arc-shaped hole. The arc-shaped hole refers to a groove structure with an arc-shaped inner wall, which can be achieved by machining an arc-shaped groove on the circumferential outer wall of the shift wheel 532. Its arc-shaped inner wall forms an adaptive snap-fit ​​with the spherical contact of the stop ball. The stop hook refers to a positioning element with a hook-shaped protrusion, which can be made by stamping an elastic metal sheet. Its hook-shaped protrusion can be embedded in the corner of the triangular hole. The triangular hole refers to a groove structure with a triangular outline, which can be achieved by machining a triangular notch on the surface of the shift wheel 532. Its corner edges form a stable engagement with the hook-shaped structure of the stop hook.

[0089] Specifically, when the shift wheel 532 rotates to the target position, the elastic element 61 pushes the stop element 62 to move towards the locking position 532b. If a combination of a stop ball and an arc-shaped hole is used, the stop ball is embedded in the arc-shaped hole under the action of elastic force, and multi-directional limiting is achieved through the contact between the spherical surface and the arc-shaped inner wall; if a combination of a stop hook and a triangular hole is used, the hook-shaped protrusion of the stop hook is locked into the corner of the triangular hole under the action of elastic force, and unidirectional limiting is achieved through the complementary engagement of geometric shapes. Both implementations eliminate the free clearance after the shift wheel 532 rotates through mechanical locking, thereby preventing the moving lens 40 from retreating or shifting due to the transmission clearance of the gear 531.

[0090] Compared with existing technologies, traditional locking structures use pin-type limiting with a single planar contact, which has a small contact area and is easily affected by wear, thus affecting positioning accuracy. This application achieves multi-directional adaptive limiting and directional rigid limiting respectively through the spherical contact between the arc-shaped hole and the stop ball or the geometric engagement between the triangular hole and the stop hook, significantly improving the uniformity of stress distribution on the contact surface and reducing the risk of locking failure due to part machining errors.

[0091] Please see Figure 4 This application further proposes that the rack 52 is provided with at least one limiting hole 52a, and the outer wall of the housing 10 is provided with a limiting post 10b, which is inserted into the limiting hole 52a to limit the movement range of the rack 52.

[0092] The limiting hole 52a refers to a hole structure with a specific shape opened on the surface of the rack 52, which can be elliptical or elongated. Through the cooperation of the limiting hole 52a and the limiting post 10b, the maximum displacement of the rack 52 in linear motion is limited. The limiting post 10b refers to a protruding structure fixed to the outer wall of the housing 10, which can be cylindrical or square metal parts. By embedding into the limiting hole 52a, a physical limit is formed to prevent the rack 52 from exceeding the preset stroke range.

[0093] Specifically, when the push button 51 drives the rack 52 to move in a straight line, the limiting post 10b remains locked inside the limiting hole 52a. When the rack 52 moves to one edge of the limiting hole 52a, the limiting post 10b contacts the hole wall of the limiting hole 52a, preventing the rack 52 from moving further. Thus, the range of motion of the rack 52 is precisely controlled, avoiding disengagement of the gear assembly 53 from the rack 52 or mechanical interference due to excessive displacement.

[0094] Compared with the prior art, the prior art relies solely on the meshing of gears and racks to achieve transmission, lacking active constraint on the stroke of rack 52. This makes rack 52 prone to deviation or derailment due to assembly errors or external impacts. In contrast, this application forms a rigid limiting structure through the cooperation of limiting hole 52a and limiting post 10b, which can ensure that rack 52 moves stably along a preset trajectory even when there is a small gap between gear 531 and rack 52.

[0095] This utility model also proposes a laser therapy device, which includes a main unit and a laser handpiece; the laser handpiece is connected to the main unit. A light source is provided on the main unit, and the laser emitted by the light source is guided to the treatment area on the skin through the laser handpiece. The specific structure of the laser handpiece is as described in the above embodiments. Since this laser therapy device adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated further here.

[0096] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A laser handpiece characterized by, The laser handpiece includes: case; A movable base, which is movably connected to the housing; The fixing base is fixed inside the housing; A fixed lens is fixed to the mounting base; The movable lens is fixed on the movable base, and A gear shifting mechanism, comprising a push-gear button, a rack and a gear assembly, wherein the push-gear button is movably connected to the outside of the housing, and one end of the push-gear button extends into the housing and is connected to the rack, and the rack and the movable seat are respectively connected to the gear assembly for transmission. The push button drives the rack to rotate the gear assembly, so that the movable seat can move relative to the fixed seat to adjust the distance between the fixed lens and the movable lens.

2. The laser handpiece of claim 1, wherein, The gear assembly includes: Gear, which meshes with the rack; and A shift wheel is coaxially connected to the gear and has a guide groove; one end of the movable seat is movably connected to the guide groove and the other end of the movable seat is connected to the movable lens; The push button drives the rack so that the gear drives the shift wheel to rotate, so that the moving lens is guided by the rotating guide groove to make a reciprocating linear motion.

3. The laser handpiece of claim 2, wherein, The guide groove is an involute guide groove; Alternatively, the guide groove is a spiral guide groove, and the guide groove is spaced apart from the center of the shift wheel.

4. The laser handpiece of claim 2, wherein, The mobile seat includes: Connecting rod, one end of which is confined within the guide groove; and The mounting part is connected to the other end of the connecting rod and has a mounting hole for mounting the movable lens.

5. The laser handpiece of claim 2, wherein, The housing has an inner cavity and a gear hole communicating with the inner cavity; the fixed base is installed in the inner cavity, the rack and the gear are both installed on the outer wall of the fixed base, the gear shift wheel is installed inside the fixed base, and the push-gear button is movably connected to the gear hole.

6. The laser handpiece of claim 5, wherein, The mounting base has a mounting groove, an optical path channel, a limiting groove, and a light-emitting hole. The mounting groove is connected to the limiting groove, and the light-emitting hole and the limiting groove are respectively connected to the optical path channel. The mounting slot is used to install the shift wheel. The movable seat is movably connected to the optical path channel, and one end of the movable seat extends from the limiting slot into the guide slot so that the movable seat is connected to the shift wheel in a transmission manner. The fixed lens is installed in the optical path channel and is set away from the light outlet hole so that the movable seat drives the movable lens to move closer to or away from the light outlet hole.

7. The laser handpiece of claim 6, wherein, The laser handpiece also includes a locking component, which is connected to the fixed base and elastically abuts against the shift wheel to lock the position of the movable lens.

8. The laser handpiece of claim 7, wherein, The fixed base is also provided with a guide groove that communicates with the mounting groove; the circumferential outer wall of the shift wheel is provided with a plurality of snap-fit ​​positions, each of the snap-fit ​​positions communicating with the guide groove; The locking component includes: An elastic element, one end of which is connected to the wall of the guide groove; and A stop member is connected to the other end of the elastic member and is engaged at a locking position to lock the shift wheel.

9. The laser handpiece of claim 8, wherein, The stopper is a stop ball, and the clamping position is a circular arc hole position. Or, the stopper is a stop hook, and the clamping position is a triangular hole position.

10. The laser handpiece of claim 1, wherein, The rack is provided with at least one limiting hole, and an outer wall of the shell is provided with a limiting column, the limiting column is clamped into the limiting hole, and the movement range of the rack is limited.

11. A laser therapy apparatus, characterized by, The laser treatment instrument comprises: a host computer; and The laser handpiece of any one of claims 1 to 10 is connected with the host computer.

Images