Plastic focusing luminaire

Abstract

The application relates to the technical field of illumination optical elements, in particular to a plastic focusing lamp, which comprises a base assembly, a pitch connecting seat and a focusing lamp head assembly, and the focusing lamp head assembly is rotationally connected with the base assembly through the pitch connecting seat. The focusing lamp head assembly is internally provided with a light source assembly, a focusing lens group and a focusing sleeve mechanism. The focusing sleeve mechanism comprises a fixed inner sleeve and a sliding outer sleeve. The sliding outer sleeve can axially slide along the fixed inner sleeve to realize focusing. A damping pad is arranged between the outer wall of the fixed inner sleeve and the inner wall of the sliding outer sleeve. The damping pad is in interference fit with the boss of the inner wall of the sliding outer sleeve, and the cross-section thickness of the damping pad gradually changes from thick in the middle to thin at both ends, so that the damping force is the largest when the sliding outer sleeve is located in the middle stroke, and the damping force gradually decreases when the sliding outer sleeve is located at both ends. The application takes into account the positioning stability in the middle stroke and the anti-collision protection at the limit position, effectively delays the damping force attenuation, and significantly improves the focusing operation hand feeling and long-term use reliability.

Description

Technical Field

[0001] This application relates to the field of lighting technology, and in particular to a plastic focusing lamp. Background Technology

[0002] Currently, professional lighting fixtures with focus and angle adjustment functions generally use aluminum for their focus telescopic mechanism and lamp head tilt and rotation mechanism. Aluminum has high mechanical strength, making it compatible with adjustment structures such as gears and ratchet mechanisms, and can meet the needs of long-term, repeated adjustments. However, the high price of aluminum raw materials and the fact that many components rely on machining processes result in long production cycles and high overall manufacturing costs, making it difficult to lower the finished product price and limiting market penetration.

[0003] To reduce manufacturing costs, some manufacturers have tried to replace the metal parts in the focusing mechanism with engineering plastics. However, since plastics are not as strong and wear-resistant as metals, the original gear meshing, ratchet locking and other adjustment structures are prone to tooth wear and cracking under plastic materials. After long-term repeated use, the adjustment and positioning will fail and the reliability will be difficult to guarantee. Summary of the Invention

[0004] In view of the above, the main objective of this application is to provide a plastic focusing lamp to solve the aforementioned technical problems.

[0005] The plastic focusing lamp provided in this application adopts the following technical solution: A plastic focusing lamp includes a base assembly, a pitch connector, and a focusing lamp head assembly; the focusing lamp head assembly is rotatably connected to the base assembly via the pitch connector to achieve lamp head pitch angle adjustment; the focusing lamp head assembly internally includes a light source assembly, a focusing lens group, and a focusing sleeve mechanism. The focusing sleeve mechanism includes a fixed inner cylinder and a sliding outer cylinder; the sliding outer cylinder is coaxially sleeved outside the fixed inner cylinder and can slide back and forth along the axial direction of the fixed inner cylinder; the front end of the sliding outer cylinder is used to support the focusing lens group; the focal length is adjusted by changing the relative distance between the focusing lens group and the light source assembly. A boss is provided on the inner wall of the sliding outer cylinder, and a damping pad is provided between the outer wall of the fixed inner cylinder and the inner wall of the sliding outer cylinder. The damping pad abuts against the boss and provides friction, so that the sliding outer cylinder is held in the current position by the friction after the axial pushing and pulling force is removed. The damping pad has a gradually varying cross-sectional thickness along the axial direction of the fixed inner cylinder, and the cross-sectional thickness of the middle section of the damping pad is greater than that of the two end sections, forming a variable cross-sectional shape that is thicker in the middle and thinner at both ends. This makes the damping force provided by the damping pad the maximum when the sliding outer cylinder is in the middle stroke position, and the damping force gradually decreases when it is in the extreme positions at both ends.

[0006] By adopting the above technical solution, when in use, the user pushes and pulls the sliding outer cylinder along the axis. The sliding outer cylinder slides axially relative to the fixed inner cylinder, driving the focusing lens group to move synchronously, changing the relative distance between the focusing lens group and the light source assembly, thereby realizing stepless adjustment of the lamp's focal length. During the sliding process of the outer cylinder, the damping pad and the protrusion on the inner wall of the sliding outer cylinder maintain abutment and generate friction. When the user stops pushing and pulling and removes the external force, the sliding outer cylinder maintains its current position by means of this friction, achieving stable hovering at any focusing position. During the entire stroke of the sliding outer cylinder reciprocating along the axial direction of the fixed inner cylinder, because the cross-sectional thickness of the middle section of the damping pad is greater than that of the two end sections, when the sliding outer cylinder is in the middle stroke position, the boss contacts the thickest middle section of the damping pad, and the normal pressure between the damping pad and the boss is the greatest, thus providing the maximum damping force and ensuring the positioning stability and resistance to external disturbances of the commonly used middle focusing area. When the sliding outer cylinder is pushed or pulled to near the extreme positions at both ends, the boss contacts the thinner ends of the damping pad, the normal pressure gradually decreases, and the damping force also gradually decreases. When the user approaches the extreme position, the hand automatically becomes lighter, forming a natural physical positioning prompt, effectively avoiding damage to the limiting structure caused by rigid collision between the sliding outer cylinder and the fixed inner cylinder due to excessive force. At the same time, the variable cross-section damping pad can be achieved by adjusting only the local dimensions of the mold cavity during injection molding, without changing the main structure of the fixed inner cylinder and the sliding outer cylinder. This application sets the damping pad to a variable cross-sectional shape that is thicker in the middle and thinner at both ends, so that the lamp can obtain a non-linearly distributed damping force throughout the entire push-pull focusing stroke. This balances stable hovering in the middle stroke with anti-collision protection at the extreme stroke, improving the feel and safety of focusing operation.

[0007] In one specific implementation, one end of the fixed inner cylinder is connected to the pitch connection seat, and the light source assembly is fixedly installed on the end face of the fixed inner cylinder.

[0008] By adopting the above technical solution, the fixed inner cylinder serves as the mounting base for the light source assembly, ensuring that the light source assembly remains in a fixed position during the focusing process. The focal length adjustment is achieved solely by moving the focusing lens group via the sliding outer cylinder, resulting in high optical path alignment accuracy.

[0009] In one specific implementation, the inner wall of the sliding outer cylinder is further provided with a plurality of retaining strips, and the outer wall of the fixed inner cylinder is provided with a sliding groove corresponding to each of the retaining strips. Each retaining strip is slidably engaged in the corresponding sliding groove to constrain the sliding outer cylinder to move only axially relative to the fixed inner cylinder and not to rotate circumferentially.

[0010] By adopting the above technical solution, the sliding engagement of each locking strip with its corresponding groove provides circumferential constraint on the axial sliding of the outer cylinder, ensuring that the outer cylinder can only reciprocate along the axial direction of the fixed inner cylinder without circumferential deflection. This ensures that the optical axes of the focusing lens group and the light source assembly are always aligned, avoiding spot shift or distortion caused by circumferential rotation. Simultaneously, the contact guidance between the locking strip and the groove also shares some of the radial load, reducing the risk of uneven wear on the damping pad and making the pushing and pulling process of the outer cylinder smoother. The overall structure requires no additional anti-rotation parts and can be obtained through injection molding, making it easy to implement.

[0011] In one specific implementation, the damping patch is a multi-layer composite structure, including an elastic compensation layer and a wear-resistant damping layer disposed on the outside of the elastic compensation layer.

[0012] By adopting the above technical solution, the wear-resistant damping layer directly contacts the boss and provides stable frictional damping force, ensuring the reliability of focusing and positioning; the elastic compensation layer automatically expands and compensates for creep and thinning of the wear-resistant damping layer after long-term use, maintaining the interference between the damping pad and the boss basically constant, effectively delaying the attenuation of damping force and extending the effective service life of the damping pad.

[0013] In one specific implementation, the elastic compensation layer is a foamed elastic material layer, the wear-resistant damping layer is a silicone layer, and the foamed elastic material layer and the silicone layer are formed into an integrated double-layer structure through a co-vulcanization process or an adhesive composite process.

[0014] By adopting the above technical solution, the foamed elastic material layer has a high compression resilience, which can continuously provide elastic compensation force when the wear-resistant damping layer creeps and thins, maintaining the stability of the interference between the damping patch and the boss; the silicone layer has a stable coefficient of friction and good wear resistance, ensuring the reliability of the damping force during long-term use; the foamed elastic material layer and the silicone layer form an integrated double-layer structure through co-vulcanization or adhesive composite process, with a tight bond between the two layers and no relative slippage, avoiding the risk of delamination and ensuring the integrity of the double-layer structure and its long-term stability.

[0015] In one specific implementation, a positioning groove is provided on the outer wall of the fixed inner cylinder, and the damping sticker is embedded and pasted in the positioning groove. The outer surface of the damping sticker and the boss on the inner wall of the sliding outer cylinder form an interference fit.

[0016] By adopting the above technical solution, the positioning groove provides a precise mounting position for the damping pad, ensuring that the damping pad does not shift or move after installation; the mounting and pasting method ensures that the damping pad is firmly bonded to the fixed inner cylinder, preventing it from falling off or shifting during the reciprocating sliding of the outer cylinder; the interference fit between the outer surface of the damping pad and the boss ensures that the two always maintain close contact, thereby generating a stable and reliable frictional force, providing continuous damping force guarantee for the suspension and positioning of the outer cylinder at any focusing position, and avoiding positioning failure due to poor contact.

[0017] In one specific implementation, the pitch connection seat includes a support base and a ball joint. The support base is fixedly installed on the base assembly, one end of the ball joint is fixedly connected to one end of the fixed inner cylinder, and the other end of the ball joint is hinged to the support base.

[0018] By adopting the above technical solution, one end of the spherical joint is connected to the fixed inner cylinder and the other end is hinged to the support base, so that the focusing lamp head assembly can swing in multiple angles around the center of the spherical joint. Moreover, the spherical structure has better centering than a single rotating shaft, ensuring that the focusing lamp head assembly does not wobble during the pitch adjustment process. The overall structure is simple and easy to assemble.

[0019] In one specific implementation scheme, the spherical joint and the support base are connected by a damping hinge structure, and the hinge mating surfaces of the spherical joint and the support base rely on friction to achieve the hovering and positioning of the lamp head at any pitch angle; a limiting surface is also provided at the hinge point of the spherical joint and the support base to limit the pitch adjustment angle range.

[0020] By adopting the above technical solution, the friction between the spherical joint and the hinged mating surface of the support seat enables the focusing lamp head assembly to be stably suspended at any pitch angle without the need for an additional locking device. Users can complete the pitch adjustment and positioning with one hand, making the operation convenient. At the same time, the limiting surface physically constrains the pitch angle range, effectively preventing structural interference or damage caused by over-travel adjustment, thus improving the safety and reliability of the lamp's pitch adjustment. The overall structure is simple and easy to implement.

[0021] In one specific implementation scheme, the base assembly is provided with a sensor probe, a power supply interface, a power switch, and function buttons for controlling the switching of the lamp and switching its working mode.

[0022] By adopting the above technical solution, the power supply interface provides power to the lamp, the power switch controls the lamp's on / off state, the function buttons allow users to switch between different working modes, and the sensor probe is used to sense environmental parameters or user operation commands. All functional components are integrated on the base assembly, allowing users to complete power supply connection, switch control, and mode switching in the same area without having to operate multiple separate components, thus providing high convenience.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. This application uses a variable cross-sectional shape where the thickness of the middle section is greater than that of the two end sections. This results in a non-linear distribution of the damping force obtained by the sliding outer cylinder during axial sliding—the damping force is greatest at the middle stroke position, ensuring the positioning stability and resistance to external disturbances in commonly used focusing areas. As the sliding outer cylinder approaches the extreme positions at both ends, the damping force gradually decreases. When the user approaches the extreme positions, the feel automatically becomes lighter, forming a natural positioning indication. This effectively avoids damage to the limiting structure caused by rigid collision between the sliding outer cylinder and the fixed inner cylinder due to excessive force. This application balances stable hovering in the middle stroke with anti-collision protection at the extreme stroke, significantly improving the focusing operation feel and extending the service life of the limiting structure. 2. This application further configures the damping pad as a multi-layer composite structure, including an elastic compensation layer and a wear-resistant damping layer disposed outside the elastic compensation layer. The wear-resistant damping layer directly contacts the boss on the inner wall of the sliding outer cylinder and provides stable frictional damping force, ensuring the reliability of focusing and positioning; the elastic compensation layer automatically expands elastically to compensate when the wear-resistant damping layer thins due to creep after long-term use, maintaining the interference between the damping pad and the boss at a basically constant level, effectively delaying the attenuation of damping force. Compared with the existing single-layer damping components where the damping force gradually decreases due to creep after long-term use, this application significantly extends the effective service life of the damping pad and reduces the frequency of maintenance and replacement due to damping force attenuation; 3. All core structural components of this application (fixed inner cylinder, sliding outer cylinder, pitch connection seat, etc.) can be injection molded from engineering plastics, requiring no machining and reducing the number of parts. The anti-rotation guide structure of the locking strip and slide groove, as well as the embedded adhesive structure of the positioning groove and damping sticker, can be integrally molded during injection molding, eliminating the need for additional anti-rotation parts or positioning brackets. The components are directly assembled through damping or sliding fits, simplifying the assembly process, facilitating large-scale mass production, and resulting in lower overall manufacturing costs. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of the plastic focusing lamp according to an embodiment of this application; Figure 2 yes Figure 1 Exploded view; Figure 3 yes Figure 2A cross-sectional view of the structure of the sliding outer cylinder; Figure 4 yes Figure 2 Schematic diagram of the fixed inner cylinder structure; Figure 5 yes Figure 2 Cross-sectional view of the damping pad structure.

[0025] Explanation of reference numerals in the attached drawings: 1. Base assembly; 2. Pitch connector; 201. Support base; 202. Spherical connector; 3. Focusing lamp head assembly; 301. Fixed inner cylinder; 3011. Positioning groove; 3012. Slide groove; 302. Light source assembly; 303. Sliding outer cylinder; 3031. Boss; 3032. Locking strip; 304. Focusing lens group; 4. Damping pad; 401. Wear-resistant damping layer; 402. Elastic compensation layer. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0027] This application discloses a plastic focusing lamp.

[0028] Reference Figure 1 and Figure 2 A plastic focusing lamp includes a base assembly 1, a tilt connector 2, and a focusing lamp head assembly 3. The focusing lamp head assembly 3 is rotatably connected to the base assembly 1 via the tilt connector 2, enabling adjustment of the lamp head's tilt angle. The base assembly 1 is equipped with a sensor probe, a power supply interface, a power switch, and function buttons for controlling the lamp's on / off state and switching operating modes. The sensor probe is used to detect environmental parameters (such as ambient light intensity, human infrared signals, etc.) or user operation commands. The power supply interface is used to connect to an external power source to power the lamp. The power switch controls the lamp's on / off state, and the function buttons allow the user to switch between different operating modes (such as high light mode, low light mode, strobe mode, etc.). All functional components are integrated on the base assembly 1, allowing the user to complete power connection, on / off control, and mode switching operations in the same area, providing high convenience.

[0029] The focusing lamp head assembly 3 internally houses a light source assembly 302, a focusing lens group 304, and a focusing sleeve mechanism. The light source assembly 302, serving as the lamp's light source, can utilize an LED light source module and is fixedly mounted on the end face of the fixed inner cylinder 301. The focusing lens group 304, composed of one or more optical lenses, is mounted on the front end of the sliding outer cylinder 303 and moves synchronously with it. The beam angle is adjusted by changing the relative distance to the light source assembly 302.

[0030] Reference Figure 2 and Figure 4The focusing sleeve mechanism includes a fixed inner cylinder 301 and a sliding outer cylinder 303. One end of the fixed inner cylinder 301 is fixedly connected to the pitch connecting seat 2. The light source assembly 302 is fixedly installed on the end face of the fixed inner cylinder 301 by screws, so that the light source assembly 302 always maintains a fixed position during focusing, ensuring the stability of the optical path reference. The fixed inner cylinder 301 has a hollow cylindrical structure, and its axis extends along the light output direction of the lamp. The interior can be used to run power supply cables or control circuits. The sliding outer cylinder 303 is coaxially sleeved on the outside of the fixed inner cylinder 301, and the inner diameter of the sliding outer cylinder 303 is larger than the outer diameter of the fixed inner cylinder 301, with an assembly gap between them. The sliding outer cylinder 303 can slide back and forth along the axis of the fixed inner cylinder 301, and its front end (i.e., the end away from the pitch connecting seat 2) is used to support the focusing lens assembly 304. The front end of the sliding outer cylinder 303 can be provided with an internal or external thread structure for threaded connection with the lens barrel of the focusing lens assembly 304, or it can be fixed by snap-fit ​​or adhesive. When the sliding outer cylinder 303 slides along the axial direction of the fixed inner cylinder 301, it drives the focusing lens assembly 304 to move synchronously. By changing the relative distance between the focusing lens assembly 304 and the light source assembly 302, the focal length of the lamp can be infinitely adjusted. When the focusing lens assembly 304 is away from the light source assembly 302, the beam angle narrows, the light spot becomes smaller, and the illuminance increases; when the focusing lens assembly 304 is close to the light source assembly 302, the beam angle widens, the light spot becomes larger, and the illuminance decreases.

[0031] The outer wall of the sliding outer cylinder 303 may be provided with anti-slip texture (such as knurling or annular grooves) to increase the friction of the user's fingers when pushing and pulling, and improve the operating feel. The rear end of the sliding outer cylinder 303 (i.e. the end near the pitch connecting seat 2) may be provided with a limiting flange, which is used to cooperate with the limiting step on the outer wall of the fixed inner cylinder 301 to constrain the maximum extension position of the sliding outer cylinder 303 and prevent the sliding outer cylinder 303 from coming off the front end of the fixed inner cylinder 301.

[0032] Reference Figure 2 , Figure 3 and Figure 4A boss 3031 is provided on the inner wall of the sliding outer cylinder 303. The boss 3031 is a structure that protrudes radially inward from the inner wall surface of the sliding outer cylinder 303. The boss 3031 has a certain width along the axial direction of the sliding outer cylinder 303, and its width can be designed to fit the width of the damping pad 4. The inner surface of the boss 3031 is a smooth mating surface, used to abut against the outer surface of the damping pad 4. A damping pad 4 is provided between the outer wall of the fixed inner cylinder 301 and the inner wall of the sliding outer cylinder 303. The damping pad 4 abuts against the boss 3031 and provides friction. When the user pushes or pulls the sliding outer cylinder 303 axially, the sliding outer cylinder 303 slides axially relative to the fixed inner cylinder 301; when the user stops pushing or pulling and removes the external force, the sliding outer cylinder 303 remains in its current position due to the friction between the damping pad 4 and the boss 3031, achieving stable hovering at any focusing position. A positioning groove 3011 is formed on the outer wall of the fixed inner cylinder 301. The number of positioning grooves 3011 corresponds to the number of bosses 3031. The positioning grooves 3011 are evenly distributed around the outer wall of the fixed inner cylinder 301. The width of the positioning groove 3011 is adapted to the width of the damping pad 4, and the depth is slightly less than the thickness of the damping pad 4. The damping pad 4 is embedded and pasted in the positioning groove 3011. The positioning groove 3011 provides a precise embedding position for the damping pad 4, ensuring that the damping pad 4 does not shift axially or move circumferentially after installation. The inner surface of the damping pad 4 is fixedly bonded to the bottom surface of the positioning groove 3011 with an adhesive (such as epoxy resin or silicone sealant), forming a firm bond, so that it will not fall off or shift during the reciprocating sliding of the sliding outer cylinder 303. An interference fit is formed between the outer surface of the damping pad 4 and the boss 3031 on the inner wall of the sliding outer cylinder 303. That is, the outer diameter of the damping pad 4 in its free state is slightly larger than the inner diameter of the boss 3031, ensuring that the two always maintain close contact, thereby generating a stable and reliable frictional force. This provides continuous damping force for the suspension and positioning of the sliding outer cylinder 303 at any focusing position, avoiding positioning failure due to poor contact.

[0033] Reference Figure 3 and Figure 4The inner wall of the sliding outer cylinder 303 is also provided with multiple retaining strips 3032. Each retaining strip 3032 is a strip-shaped structure that protrudes radially inward from the inner wall surface of the sliding outer cylinder 303, extending along the axial direction of the sliding outer cylinder 303, and its length is adapted to the sliding stroke of the sliding outer cylinder 303. The outer wall of the fixed inner cylinder 301 is provided with sliding grooves 3012 corresponding to each retaining strip 3032. Each sliding groove 3012 is a strip-shaped groove extending along the axial direction of the fixed inner cylinder 301. Each retaining strip 3032 slides within its corresponding sliding groove 3012, with the width of the retaining strip 3032 matching the width of the sliding groove 3012. The fit between the two is a clearance fit, with a clearance of 0.1mm to 0.3mm, to ensure smooth sliding without significant radial wobble. The fit between the retaining strips 3032 and the sliding grooves 3012 constrains the sliding outer cylinder 303 to move only axially relative to the fixed inner cylinder 301, preventing circumferential rotation. The number of retaining strips 3032 and sliding grooves 3012 can both be four. Four retaining strips 3032 are symmetrically arranged on the inner wall of the sliding outer cylinder 303, and four sliding grooves 3012 are symmetrically opened on the outer wall of the fixed inner cylinder 301, thereby achieving uniform guiding constraint and preventing the sliding outer cylinder 303 from tilting due to uneven force during sliding. The sliding engagement of the retaining strips 3032 and sliding grooves 3012 ensures that the optical axes of the focusing lens group 304 and the light source assembly 302 are always aligned, avoiding spot shift or distortion caused by the circumferential rotation of the sliding outer cylinder 303. Simultaneously, the contact guidance between the retaining strips 3032 and sliding grooves 3012 also shares part of the radial load, reducing the risk of uneven wear of the damping pad 4, making the pushing and pulling process of the sliding outer cylinder 303 smoother. The cross-sectional shape of the retaining strips 3032 and sliding grooves 3012 can be rectangular, trapezoidal, or arc-shaped; in this embodiment, a rectangular shape is preferred for ease of injection molding and sliding engagement.

[0034] Reference Figure 5The damping pad 4 has a multi-layer composite structure, including an elastic compensation layer 402 and a wear-resistant damping layer 401 disposed on the outside of the elastic compensation layer 402. The wear-resistant damping layer 401 directly contacts the boss 3031 on the inner wall of the sliding outer cylinder 303 and provides stable frictional damping force, ensuring the reliability of focusing and positioning. When the wear-resistant damping layer 401 creeps and thins over long-term use, the elastic compensation layer 402 automatically expands to compensate, maintaining a basically constant interference fit between the damping pad 4 and the boss 3031, effectively delaying the attenuation of damping force and extending the effective service life of the damping pad 4. The wear-resistant damping layer 401 is a silicone layer, specifically a high-hardness silicone layer with a Shore hardness of 60A to 80A, which has a stable coefficient of friction and good wear resistance, and can maintain surface integrity during long-term reciprocating sliding, making it less prone to generating wear debris. The elastic compensation layer 402 is a foamed elastic material layer, specifically a foamed silicone layer, with a closed-cell or open-cell foam structure and a compression rebound rate of not less than 80%, enabling it to quickly recover its original shape after being deformed under pressure. The foamed elastic material layer and the silicone layer form an integrated double-layer structure through a co-vulcanization process, an adhesive co-vulcanization process, or an adhesive composite process. The two layers are tightly bonded without relative slippage, avoiding the risk of delamination and ensuring the integrity and long-term stability of the double-layer structure. The damping patch 4 has a gradually varying cross-sectional thickness along the axial direction of the fixed inner cylinder 301, and the cross-sectional thickness of the middle section of the damping patch 4 is greater than that of the two end sections, forming a variable cross-sectional shape that is thicker in the middle and thinner at both ends. This ensures that the damping force provided by the damping patch 4 is maximized when the sliding outer cylinder 303 is in the middle stroke position and gradually decreases when it is in the extreme positions at both ends.

[0035] Specifically, when the sliding outer cylinder 303 is in the middle stroke position, the boss 3031 contacts the thickest section of the damping pad 4 in the middle, and the normal pressure is the greatest, thereby providing the greatest damping force to ensure the positioning stability and resistance to external disturbances of the commonly used middle focusing area. When the sliding outer cylinder 303 is pushed or pulled to the extreme positions at both ends, the boss 3031 contacts the thinner sections at both ends of the damping pad 4, and the normal pressure gradually decreases. The damping force also gradually decreases. When the user approaches the extreme position, the hand feel automatically becomes lighter, forming a natural physical positioning prompt, effectively avoiding damage to the limiting structure caused by rigid collision between the sliding outer cylinder 303 and the fixed inner cylinder 301 due to excessive force. The cross-sectional thickness of the damping patch 4 can be smoothly and continuously reduced from the middle section to both ends (e.g., in an arc or parabolic curve), or it can be reduced in a stepped manner from the middle section to both ends (e.g., divided into a thick central section, a transitional middle section, and thin end sections). Both methods can achieve the above-mentioned nonlinear damping force distribution technical effect. The specific choice can be made according to the processing convenience and feel design requirements of the injection mold.

[0036] Reference Figure 2The pitch connection seat 2 includes a support seat 201 and a ball joint 202. The support seat 201 is fixedly installed on the base assembly 1. The lower end of the support seat 201 can be fixedly connected to the upper surface of the base assembly 1 by bolts or screws. The upper end of the support seat 201 is provided with a hinge seat for hinged connection with the ball joint 202. One end of the ball joint 202 is fixedly connected to one end of the fixed inner cylinder 301 (e.g., by threaded connection, snap-fit ​​connection, or integral molding connection). The other end of the ball joint 202 has a ball head structure, forming a ball-and-socket fit with the hinge seat of the support seat 201. The ball joint 202 and the support seat 201 are connected by a damping hinge structure. The friction between the hinge mating surfaces of the ball joint 202 and the support seat 201 enables the lamp head to be hovered and positioned at any pitch angle. Specifically, the hinge seat of the support base 201 can be configured as a split structure, including a left half-shell and a right half-shell. The left half-shell and the right half-shell are locked together by bolts. The normal pressure between the hinge mating surfaces is adjusted by adjusting the tightening force of the bolts, thereby adjusting the magnitude of the pitch damping force. A limiting surface is also provided at the hinge point between the ball joint 202 and the support base 201 to limit the pitch adjustment angle range and prevent structural interference or damage caused by over-adjustment. The limiting surface can be formed by a protruding stop block set at the root of the ball joint 202 and a groove or stop block set on the support base 201, or it can be formed by a fan-shaped groove opened on the ball head surface of the ball joint 202 and a limiting pin on the inner wall of the hinge seat of the support base 201. The physical constraint of the angle range is achieved by the contact between the limiting surface and the limiting pin at a specific angular position.

[0037] The implementation principle of a plastic focusing lamp according to this application embodiment is as follows: In use, the user pushes and pulls the sliding outer cylinder 303 axially. Under the guidance and constraint of the locking strip 3032 and the sliding groove 3012, the sliding outer cylinder 303 slides back and forth along the axial direction of the fixed inner cylinder 301 without circumferential rotation. When the sliding outer cylinder 303 moves, it drives the focusing lens group 304 at its front end to move synchronously, changing the relative distance between the focusing lens group 304 and the light source assembly 302 on the end face of the fixed inner cylinder 301, thereby realizing stepless adjustment of the lamp's focal length—when sliding out, the focusing lens group 304 moves away from the light source assembly 302, the beam angle narrows and the light spot concentrates; when retracted, the focusing lens group 304 moves closer to the light source assembly 302, the beam angle expands and the light spot diverges. During the sliding process of the outer cylinder 303, the damping pad 4 and the protrusion 3031 on the inner wall of the outer cylinder 303 maintain an interference fit and generate friction. When the user stops pushing and pulling and removes the external force, the outer cylinder 303 remains in the current position by means of this friction, achieving stable hovering at any focusing position.

[0038] During the entire stroke of the sliding outer cylinder 303 reciprocating along the fixed inner cylinder 301, since the thickness of the middle section of the damping pad 4 is greater than that of the two end sections, when the sliding outer cylinder 303 is in the middle stroke position, the boss 3031 contacts the thickest middle section of the damping pad 4, and the normal pressure between the damping pad 4 and the boss 3031 is the greatest, thus providing the maximum damping force and ensuring the positioning stability of the middle focusing area; when the sliding outer cylinder 303 is pushed or pulled to near the extreme positions at both ends, the boss 3031 contacts the thinner ends of the damping pad 4, the normal pressure gradually decreases, and the damping force also gradually decreases. When the user approaches the extreme position, the hand feel automatically becomes lighter, forming a natural positioning prompt, effectively avoiding rigid collisions caused by excessive force. Meanwhile, in the multi-layer composite structure of the damping patch 4, the wear-resistant damping layer 401 directly contacts the boss 3031 and provides a stable frictional damping force. The elastic compensation layer 402 automatically expands to compensate for the creep and thinning of the wear-resistant damping layer 401 after long-term use, maintaining the interference between the damping patch 4 and the boss 3031 basically constant, effectively delaying the damping force decay and extending the effective service life of the damping patch 4.

[0039] When the lamp needs to be tilted, the user applies a tilting force by holding the focusing lamp head assembly 3. The spherical connector 202 rotates relative to the support base 201. When the focusing lamp head assembly 3 rotates to the target angle, the user releases their grip. The friction between the hinged mating surfaces of the spherical connector 202 and the support base 201 keeps the focusing lamp head assembly 3 at that angle position. The limiting surfaces constrain the angle range during tilt adjustment. When the focusing lamp head assembly 3 rotates to its limit angle, the limiting surfaces abut against each other, preventing further rotation and structural damage.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A plastic focusing lamp, characterized in that, It includes a base assembly (1), a pitch connector (2), and a focusing lamp head assembly (3); the focusing lamp head assembly (3) is rotatably connected to the base assembly (1) through the pitch connector (2) to realize the pitch angle adjustment of the lamp head; the focusing lamp head assembly (3) is provided with a light source assembly (302), a focusing lens group (304), and a focusing sleeve mechanism inside; The focusing sleeve mechanism includes a fixed inner cylinder (301) and a sliding outer cylinder (303); the sliding outer cylinder (303) is coaxially sleeved outside the fixed inner cylinder (301) and can slide back and forth along the axial direction of the fixed inner cylinder (301); the front end of the sliding outer cylinder (303) is used to support the focusing lens group (304); the focal length is adjusted by changing the relative distance between the focusing lens group (304) and the light source assembly (302); A boss (3031) is provided on the inner wall of the sliding outer cylinder (303). A damping pad (4) is provided between the outer wall of the fixed inner cylinder (301) and the inner wall of the sliding outer cylinder (303). The damping pad (4) abuts against the boss (3031) and provides friction, so that the sliding outer cylinder (303) is held in the current position by the friction after the axial pushing and pulling force is removed. The cross-sectional thickness of the damping patch (4) along the axial direction of the fixed inner cylinder (301) is gradually distributed, and the cross-sectional thickness of the middle section of the damping patch (4) is greater than that of the two end sections, forming a variable cross-sectional shape that is thick in the middle and thin at both ends. This makes the damping force provided by the damping patch (4) the maximum when the sliding outer cylinder (303) is in the middle stroke position, and the damping force gradually decreases when it is in the extreme positions at both ends.

2. The plastic focusing lamp according to claim 1, characterized in that, One end of the fixed inner cylinder (301) is connected to the pitch connection seat (2), and the light source assembly (302) is fixedly installed on the end face of the fixed inner cylinder (301).

3. The plastic focusing lamp according to claim 1, characterized in that, The inner wall of the sliding outer cylinder (303) is also provided with a plurality of retaining strips (3032), and the outer wall of the fixed inner cylinder (301) is provided with a sliding groove (3012) corresponding to each of the retaining strips (3032). Each retaining strip (3032) is slidably engaged in the corresponding sliding groove (3012) to constrain the sliding outer cylinder (303) relative to the fixed inner cylinder (301) to move only along the axial direction and not rotate circumferentially.

4. The plastic focusing lamp according to claim 1, characterized in that, The damping patch (4) is a multi-layer composite structure, including an elastic compensation layer (402) and a wear-resistant damping layer (401) disposed on the outside of the elastic compensation layer (402).

5. The plastic focusing lamp according to claim 4, characterized in that, The elastic compensation layer (402) is a foamed elastic material layer, and the wear-resistant damping layer (401) is a silicone layer. The foamed elastic material layer and the silicone layer are formed into an integrated double-layer structure through a co-vulcanization process or an adhesive composite process.

6. The plastic focusing lamp according to claim 1, characterized in that, The outer wall of the fixed inner cylinder (301) is provided with a positioning groove (3011), and the damping sticker (4) is embedded and pasted in the positioning groove (3011). The outer surface of the damping sticker (4) and the boss (3031) on the inner wall of the sliding outer cylinder (303) form an interference fit.

7. The plastic focusing lamp according to claim 1, characterized in that, The pitch connection seat (2) includes a support seat (201) and a ball joint (202). The support seat (201) is fixedly installed on the base assembly (1). One end of the ball joint (202) is fixedly connected to one end of the fixed inner cylinder (301), and the other end of the ball joint (202) is hinged to the support seat (201).

8. The plastic focusing lamp according to claim 7, characterized in that, The ball joint (202) and the support base (201) are connected by a damping hinge structure. The hinge mating surfaces of the ball joint (202) and the support base (201) rely on friction to achieve the hovering and positioning of the lamp head at any pitch angle. A limiting surface is also provided at the hinge point of the ball joint (202) and the support base (201) to limit the pitch adjustment angle range.

9. The plastic focusing lamp according to claim 1, characterized in that, The base assembly (1) is equipped with a sensor probe, a power supply interface, a power switch and function buttons, which are used to realize the switching control of the lamp and the switching of the working mode.

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