Zoom lens barrel and processing method thereof, focusing device and projection equipment

Abstract

The present application relates to a zoom lens barrel and a processing method thereof, a focusing device and a projection device. The processing method of the zoom lens barrel comprises the following steps: based on the circumferential angle and axial height of the barrel blank, determining the positions of the two ends of the curve track groove; dividing a plurality of angle values ​​within the circumferential angle range between the two ends of the curve track groove; dividing a plurality of height values ​​within the height range between the two ends of the curve track groove; the number of angle values ​​corresponds to the number of height values; making the tool cut through each height value in turn along the axial direction relative to the barrel blank, and at the same time, making the tool cut through each angle value in turn along the circumferential direction relative to the barrel blank. Since the positions of the two ends of the curve track groove can be freely selected before the tool is cut, zoom lens barrels of different specifications can be formed by cutting the barrel blank with the tool, effectively reducing the manufacturing cost of the zoom lens barrel.

Description

Technical Field

[0001] The present application relates to the technical field of zoom lens barrel processing, and in particular to a zoom lens barrel and a processing method thereof, a focusing device and a projection device. Background Art

[0002] Projection equipment is a device used to display images or pictures. It can project videos, movies, slides or other visual content onto a screen for the audience to watch. In order to adapt to the distance between the built-in light source of the projection equipment and the screen, the projection equipment is generally equipped with a focusing device. The focusing device can adjust the proportion of the visual content on the screen or the clarity of the visual content on the screen by changing the position of the optical device relative to the built-in light source.

[0003] The focusing device comprises a zoom lens barrel and a sliding bracket. The zoom lens barrel is provided with a curved track groove, and the sliding bracket is partially slidably accommodated in the curved track groove. The zoom lens barrel and the sliding bracket can move relative to each other along the axial direction.

[0004] However, since the curved track groove is not a straight line, it is difficult to process it with general processing equipment. The manufacture of traditional zoom lens barrels generally requires the use of mold molding, and the mold needs to be processed and formed using complex processing equipment. However, when the focusing device is still in the development stage, zoom lens barrels of different specifications are required for assembly testing, and using molds to mold the curved track groove of the focusing device often brings about a large cost. Summary of the invention

[0005] Based on this, the present invention provides a zoom lens barrel processing method, a zoom lens barrel, a focusing device and a projection equipment that can solve or at least alleviate the above-mentioned technical problems.

[0006] The present invention provides a method for processing a zoom lens barrel, comprising the following steps:

[0007] S10: Provide lens barrel blanks;

[0008] S20: installing the lens barrel blank on a processing table;

[0009] S30: determining two end positions of a curved track groove on the lens barrel blank according to the movable range of the sliding bracket relative to the zoom lens barrel, wherein the two end positions of the curved track groove correspond to the boundaries of the movable range of the sliding bracket respectively;

[0010] S40: within the circumferential angle range between the two ends of the curved track groove, the lens barrel blank is divided into a plurality of angle values; within the height range between the two ends of the curved track groove, the lens barrel blank is divided into a plurality of height values; the number of the angle values ​​corresponds to the number of the height values; and

[0011] S50: Make the tool cut through each of the height values ​​in sequence along the axial direction relative to the lens barrel blank, and make the tool cut through each of the angle values ​​in sequence along the circumferential direction relative to the lens barrel blank; when the position of the tool relative to the lens barrel blank matches a set of corresponding height values ​​and angle values, make the tool start to move toward another height value relative to the lens barrel blank, and make the tool synchronously start to rotate toward another angle value relative to the lens barrel blank.

[0012] In the above-mentioned processing method of zoom lens barrel, when the positions of the two ends of the curved trajectory groove are different, the shape and length of the curved trajectory groove will change, thereby forming zoom lens barrels of different specifications. After the end point positions of the curved trajectory groove are determined on the lens barrel blank, a cutting tool is used to cut and move from the starting point position of the curved trajectory groove to the end point position of the curved trajectory groove. Since the positions of the two ends of the curved trajectory groove can be freely selected before the tool is cut, zoom lens barrels of different specifications can be formed by cutting the lens barrel blank with the tool, effectively reducing the manufacturing cost of the zoom lens barrel. Since a number of angle values ​​and a number of height values ​​are divided between the two ends of the curved trajectory groove, each time the tool cuts the lens barrel blank, it only performs a small axial movement and circumferential rotation relative to the lens barrel blank. The small axial movement and circumferential rotation are less affected by the control accuracy difference. Only after the position of the tool relative to the lens barrel blank matches a set of corresponding height values ​​and angle values ​​will the tool start to move relative to the lens barrel blank to another height value, and the tool will synchronously start to rotate relative to the lens barrel blank to another angle value. This can avoid the accumulation of control accuracy errors over time and make the processing of the curved trajectory groove more precise.

[0013] In one embodiment, any two adjacent angle values ​​have an angle difference of the same magnitude; any two adjacent height values ​​have a height difference of the same magnitude.

[0014] In one embodiment, the angle difference between any two adjacent angle values ​​is not greater than 9°; and the height difference between any two adjacent height values ​​is not greater than 1.2 mm.

[0015] In one of the embodiments, the distance of the tool relative to the central axis of the lens barrel blank is adjusted by moving the tool along the radial direction of the lens barrel blank according to the outer radius and the inner radius of the lens barrel blank.

[0016] In one of the embodiments, when the tool is caused to sequentially cut through each of the angle values ​​along the circumferential direction relative to the lens barrel blank, the processing table is used to drive the lens barrel blank to rotate along the circumferential direction.

[0017] In one of the embodiments, when determining the positions of the two ends of the curved trajectory groove on the lens barrel blank, a curve equation surrounding the outer circumference of the lens barrel blank is set; the curve defined by the curve equation passes through the two ends of the curved trajectory groove; the curve equation is defined by an arc length and a stroke; the size of the arc length is at least defined by the radius and circumferential angle of the lens barrel blank; the size of the stroke is at least defined by the circumferential angle of the lens barrel blank.

[0018] In one of the embodiments, step S60 is further included: after the tool has passed all height values ​​corresponding to the same curved trajectory groove axially relative to the lens barrel blank, and the tool has passed all angle values ​​corresponding to the same curved trajectory groove circumferentially relative to the lens barrel blank, the tool is moved away from the lens barrel blank, the lens barrel blank is rotated by an interval angle, and the tool starts cutting another curved trajectory groove.

[0019] The present invention provides a zoom lens barrel, which is formed by processing the zoom lens barrel according to any one of the above embodiments.

[0020] The present invention provides a focusing device, comprising the zoom lens barrel of any one of the above embodiments.

[0021] The present invention provides a projection device, comprising the focusing device of any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of a focusing device according to an embodiment of the present application.

[0023] Figure 2 for Figure 1 The focusing device shown is a three-dimensional schematic diagram at another angle.

[0024] Figure 3 for Figure 1 The exploded schematic diagram of the focusing device shown in the figure; wherein the sliding bracket is separated from the mounting frame.

[0025] Figure 4 for Figure 1 A partial schematic diagram of the focusing device is shown; wherein the relevant structure of the mounting frame is hidden.

[0026] Figure 5 for Figure 1 The figure shows an exploded schematic diagram of a focusing device, wherein the zoom lens barrel is separated from the sliding bracket.

[0027] Figure 6 for Figure 4 The focusing device shown is a schematic diagram of an exploded view at another angle, wherein the zoom lens barrel is separated from the sliding bracket.

[0028] Figure 7 for Figure 6 A partial three-dimensional cross-sectional view of the sliding bracket, fixed frame and optical lens in FIG.

[0029] Figure 8 for Figure 6 The focusing device shown is a further exploded schematic diagram; wherein the sliding bracket, the fixed frame and the optical lens are separated.

[0030] Fig. 9 for Figure 6 The focusing device shown is a further exploded schematic diagram at another angle.

[0031] Fig.10 The figure is a flowchart of a method for manufacturing a zoom lens barrel according to an embodiment of the present application.

[0032] Fig.11 It is a schematic flow chart of a method for manufacturing a zoom lens barrel according to another embodiment of the present application.

[0033] 1. The focus adjustment device; 2. The zoom lens barrel; 2. The first peripheral wall; 2. The curved track groove; 2. The reinforcing block; 2. The supporting block; 2. The first screw hole; 2. The convex ring portion; 2. The avoidance groove; 3. The sliding bracket; 3. The slider; 3. The second peripheral wall; 3. The step transition surface; 3. The transmission tooth; 3. The outer ring portion; 3. The second screw hole; 3. The first boss portion; 3. The positioning portion; 3. The second boss portion; 3. The reinforcing rib; 4. The mounting bracket; 5. The driving assembly; 5. The driving member; 5. The driving gear; 5. The locking hole; 60. The fixing frame; 61. The step portion; 62. The flange portion; 63. The hole position; 64. The through hole; 65. The mounting hole; 71. The limit sensor element; 800. The optical lens; 801. The convex lens; 802. The concave lens. DETAILED DESCRIPTION

[0034] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0035] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] The technical solution provided by the embodiments of the present application is described below in conjunction with the accompanying drawings.

[0038] The present application provides a projection device, which is used to transmit projection light to a screen.

[0039] Specifically, combined Figure 1 and Figure 2 As shown, the projection device includes a light source device, a focusing device 100 and an optical lens 800. The light source device is used to generate an initial image light. After passing through the optical lens 800, the image light forms a parallel transmission projection light. After the projection light is transmitted to the screen, an image picture can be formed on the screen. The focusing device 100 is used to adjust the distance between the optical lens 800 and the light source device so that the optical lens 800 and the light source device form an optimal positional relationship, so that a clear image picture is formed on the screen. In one embodiment, the focusing device 100 can cause relative movement between the optical lens 800 and the light source device so that the focus of the optical lens 800 is aligned with the light source device.

[0040] In some embodiments, the projection device further includes a housing, in which the light source device, the focusing device 100 and the optical lens 800 are installed.

[0041] The present application also provides a focusing device 100 .

[0042] In some embodiments, in combination Figures 4 to 6As shown, the focusing device 100 includes a zoom lens barrel 20 and a sliding bracket 30. The zoom lens barrel 20 is provided with a plurality of curved track grooves 211. The sliding bracket 30 is provided with a plurality of sliders 31. The sliders 31 are slidably accommodated in the curved track grooves 211. One of the zoom lens barrel 20 and the sliding bracket 30 is connected to the focusing device 100, and the other is connected to the optical lens 800. Specifically, the curved track grooves 211 and the sliders 31 are arranged in a one-to-one correspondence.

[0043] In some embodiments, in combination Figure 7 As shown, the zoom lens barrel 20 is connected to the housing, and the angle of the zoom lens barrel 20 in the housing is limited. The optical lens 800 is mounted on the sliding bracket 30. The sliding bracket 30 is rotatably arranged relative to the zoom lens barrel 20 along the circumferential direction. During the rotation of the sliding bracket 30 relative to the zoom lens barrel 20 along the circumferential direction, the sliding bracket 30 simultaneously moves axially relative to the zoom lens barrel 20 under the guidance of the curved track groove 211. Since the light source device is in a stable position in the housing, the distance between the optical lens 800 and the light source device can be adjusted when the sliding bracket 30 rotates.

[0044] In some embodiments, in combination Figure 1 As shown, the focusing device 100 includes a mounting frame 40. The zoom lens barrel 20 is connected to the mounting frame 40. The mounting frame 40 is positioned and connected in the housing.

[0045] In some embodiments, in combination Figure 1 As shown, the focusing device 100 includes a driving assembly 50. The driving assembly 50 is used to drive the sliding bracket 30 to rotate the sliding bracket 30 relative to the zoom lens barrel 20. In some embodiments, the driving assembly 50 is mounted on the mounting frame 40. In other embodiments, the driving assembly 50 is mounted on the housing.

[0046] In some embodiments, the focusing device 100 can also be applied to photographic equipment. In some embodiments, the focusing device 100 can also be applied to stage lighting equipment. Specifically, the stage lighting equipment is used to project light onto the stage. Specifically, the stage lighting equipment includes a light source device, a focusing device, and an optical lens. The light source device is used to generate stage light. By adjusting the distance of the optical lens relative to the light source device through the focusing device, light spots of different sizes or different brightness can be generated on the stage. By changing different light spot effects, a certain stage atmosphere can be set off.

[0047] In some embodiments, in combination Figure 4 and Figure 5As shown, the zoom lens barrel 20 includes a first circumferential wall 21. A curved trajectory groove 211 is provided on the first circumferential wall 21. In some embodiments, the first circumferential wall 21 is cylindrical. In some embodiments, a plurality of curved trajectory grooves 211 are distributed circumferentially on the first circumferential wall 21. Further, a plurality of curved trajectory grooves 211 are evenly spaced along the circumferential direction, so that the sliding bracket 30 is stably supported. In one embodiment, three curved trajectory grooves 211 are evenly spaced along the circumferential direction on the first circumferential wall 21, and adjacent curved trajectory grooves 211 are spaced 120° apart. In some embodiments, the curved trajectory grooves 211 radially penetrate the outer side and the inner side of the first circumferential wall 21.

[0048] In some embodiments, to prevent the slider 31 from getting stuck in the curved track groove 211, the curved track groove 211 overlaps with a curve. The curve is a spiral line or other curves similar to a spiral. In some embodiments, the track groove 211 overlaps with a curve defined by a curve equation 1. The curve equation 1 is shown in formula (1):

[0049]

[0050] Specifically, when the central axis of the first peripheral wall 21 coincides with the Z axis of the cylindrical coordinates, the curve can be regarded as the trajectory of an active point. The active point simultaneously performs horizontal circular motion and linear motion perpendicular to the coordinate plane. The arc length of the trajectory of the circular motion performed by the active point is l 弧长 The linear movement distance of the active point is H 行程 θ is the angle of the decomposed circular motion, ω is the angular velocity of the decomposed circular motion, R is the radius of the decomposed circular motion, t refers to the time of the circular motion rotation, and V is the linear velocity in the vertical direction.

[0051] According to the focusing requirements and space limitations of the optical lens 800, the optical lens 800 needs to be stable during focusing, and the size of V is required to be consistent to ensure a smooth transition of the optical lens 800. The optical lens 800 can meet the focusing requirements by rotating a certain angle, so the curve takes two special points, namely the starting point and the end point, as constraints on the curve trajectory.

[0052] In some embodiments, the value of the starting point (θ, H 行程 ) is (0°, 0mm), the end point value (θ, H 行程 ) is (120°, 16 mm), the sliding bracket 30 drives the optical lens 800 to rotate 120° from the starting point and move 16 mm in a straight line.

[0053] At the end point, θ = 120°,

[0054] Therefore, at the starting point value (θ, H 行程 ) is (0°, 0mm), the end point value (θ, H 行程 ) is (120°, 16 mm), t = t 末端 . Specifically, t 末端 It is the time required for the active point to move from the starting point (0°, 0mm) to the end point (120°, 16mm).

[0055] Since the end point moves a straight line distance H in the vertical direction 末端 If the vertical linear moving speed of the active point between the starting point (0°, 0 mm) and the end point (120°, 16 mm) is V=V 末端 . Specifically,

[0056] Since θ=ωt, the curved track groove 211 coincides with the curve defined by the curve equation 2. The curve equation 2 is shown in equation (2):

[0057]

[0058] In some embodiments, in combination Figure 3 and Figure 4 As shown, the sliding bracket 30 is accommodated in the first peripheral wall 21. The slider 31 is located at the outer peripheral side of the sliding bracket 30.

[0059] In some embodiments, in combination Figure 5 As shown, the zoom lens barrel 20 also includes a reinforcing block 22. The reinforcing block 22 is connected to the outer peripheral side of the first peripheral wall 21, thereby improving the structural stability of the zoom lens barrel 20. Specifically, the reinforcing block 22 is circumferentially arranged between adjacent curved track grooves 211, so that there is a larger connection area between the reinforcing block 22 and the first peripheral wall 21, and the reinforcing block 22 is prevented from affecting the processing of the curved track groove 211.

[0060] In some embodiments, in combination Figure 4 and Figure 5 As shown, the zoom lens barrel 20 also includes a support block 23 connected to the first circumferential wall 21. Specifically, the support block 23 is axially arranged between one end of the first circumferential wall 21 and the mounting frame 40, so that one end of the first circumferential wall 21 is spaced apart from the mounting frame 40. Specifically, the position of the support block 23 along the circumference of the first circumferential wall 21 corresponds to the position of the reinforcement block 22. In some embodiments, the support block 23 is provided with a first screw hole 231. After the fastener passes through the mounting frame 40, the thread is penetrated into the first screw hole 231.

[0061] In some embodiments, in combination Figure 5 and Figure 6As shown, the zoom lens barrel 20 also includes a convex ring portion 24 connected to one end of the first circumferential wall 21. The convex ring portion 24 is protruded toward the outer peripheral side of the first circumferential wall 21, thereby further enhancing the structural stability of the zoom lens barrel 20. In some embodiments, the convex ring portion 24 is partially connected between the reinforcing block 22 and the support portion. In some embodiments, the convex ring portion 24 is connected to one end of the first circumferential wall 21 close to the mounting frame 40.

[0062] In some embodiments, in combination Figure 5 and Figure 6 As shown, the inner wall surface of the first peripheral wall 21 is provided with a avoidance groove 25. The avoidance groove 25 is recessed relative to the inner wall surface of the first peripheral wall 21, and the avoidance groove 25 is recessed radially outward. One end of the avoidance groove 25 extends to the edge of the port of the first peripheral wall 21, and the other end of the avoidance groove 25 extends to the curved track groove 211. Specifically, the avoidance groove 25 provides a passage space for the slider 31 to enter the curved track groove 211. More specifically, when the slider 31 passes through the avoidance groove 25, the slider 31 and the wall surface of the avoidance groove 25 are in an interference fit state, thereby preventing the slider 31 from automatically escaping from the curved track groove 211 through the avoidance groove 25. In some embodiments, the avoidance groove 25 is arranged in a one-to-one correspondence with the curved track groove 211. A plurality of avoidance grooves 25 are evenly spaced and distributed along the inner circumference of the first peripheral wall 21. In one embodiment, the number of the avoidance grooves 25 is three, and the interval between two adjacent avoidance grooves 25 is 120°. In one embodiment, the width of the avoidance groove 25 along the axial direction is 6.8 mm, and the diameter of the slider 31 is 6.4 mm, so that the slider 31 can move through the avoidance groove 25 along the axial direction.

[0063] In some other embodiments, the first peripheral wall 21 may be accommodated in the sliding bracket 30. The sliding block 31 is located on the inner peripheral side of the sliding bracket 30.

[0064] In some embodiments, in combination Figure 7 and Figure 8 As shown, the sliding bracket 30 includes a second peripheral wall 32. The second peripheral wall 32 is arranged inside the first peripheral wall 21. A plurality of sliders 31 are connected to the outer peripheral side of the second peripheral wall 32. In one embodiment, three sliders 31 are connected to the outer peripheral side of the second peripheral wall 32. The three sliders 31 are evenly spaced on the outer peripheral side of the second peripheral wall 32. Specifically, adjacent sliders 31 are arranged at intervals of 120° along the circumferential direction. In some embodiments, in the cross-sectional direction perpendicular to the radial direction of the second peripheral wall 32, the cross-sectional shape of the slider 31 is circular. The slider 31 is cylindrical or pie-shaped, so that the slider 31 contacts the edge of the curved track groove 211 with the cylindrical side, thereby improving the smoothness of the slider 31 sliding in the curved track groove 211.

[0065] In some embodiments, in combination Figure 7 and Fig. 9 As shown, the optical lens 800 is accommodated in the second peripheral wall 32. A step transition surface 321 is formed on the inner side of the second peripheral wall 32, and the step transition surface 321 is used to resist the mirror edge of the optical lens 800 to position the optical lens 800. Specifically, the step transition surface 321 is arranged around the inner peripheral side of the second peripheral wall 32. In some embodiments, the step transition surface 321 is annular. In other embodiments, the shape of the step transition surface 321 corresponds to the shape of the mirror edge of the optical lens 800. Since the mirror edge of the optical lens 800 has a certain curvature, the step transition surface 321 is in the shape of an arc surface, so that there is a large contact area between the step transition surface 321 and the mirror edge of the optical lens 800, reducing the pressure on the mirror edge of the optical lens 800, and preventing the mirror edge of the optical lens 800 from being crushed. Specifically, the step transition surface 321 is arranged close to the end of the second peripheral wall 32 away from the mounting frame 40.

[0066] In some embodiments, in combination Figure 1 and Figure 6 As shown, the second peripheral wall 32 is connected to a plurality of transmission teeth 322. The driving assembly 50 engages with the plurality of transmission teeth 322, thereby driving the sliding bracket 30 to rotate relative to the zoom lens barrel 20. In some embodiments, the plurality of transmission teeth 322 are distributed circumferentially on the outer peripheral side of the second peripheral wall 32. In one embodiment, the module of the transmission teeth 322 is 0.7, and the number of teeth Z of the transmission teeth 322 is 0.7. 2 is 132.

[0067] In some embodiments, in combination Figure 6 and Figure 7 As shown, the sliding bracket 30 also includes an outer ring portion 33 connected to the second peripheral wall 32. The outer ring portion 33 is radially protruded relative to the outer peripheral surface of the second peripheral wall 32. A plurality of transmission teeth 322 are connected to the outer peripheral side of the outer ring portion 33. In some embodiments, one end of the second peripheral wall 32 is close to the mounting bracket 40, and the outer ring portion 33 is connected to the end of the second peripheral wall 32.

[0068] In some embodiments, in combination Figure 6 and Figure 7 As shown, the second peripheral wall 32 is connected with a plurality of reinforcing ribs 34, and the reinforcing ribs 34 are provided to protrude relative to the inner surface or the outer surface of the second peripheral wall 32, so as to strengthen the structural strength of the sliding bracket 30. Specifically, the reinforcing ribs 34 are provided to extend along the axial direction of the second peripheral wall 32. Furthermore, the plurality of reinforcing ribs 34 are evenly spaced and distributed on the outer peripheral side of the second peripheral wall 32, so as to evenly improve the structural stability of the sliding bracket 30.

[0069] In some embodiments, in combination Figure 1 and Figure 3As shown, the driving assembly 50 includes a driving member 51 and a driving gear 52. The driving gear 52 is connected to the output shaft of the driving member 51. The driving member 51 is used to drive the driving gear 52 to rotate. The driving gear 52 is directly or indirectly meshed with the sliding bracket 30, so that the driving member 51 can drive the sliding bracket 30 to rotate relative to the zoom lens barrel 20. In some embodiments, the driving gear 52 is meshed with a plurality of transmission teeth 322. In some embodiments, the driving member 51 is a stepping motor or other driving device that can drive the driving gear 52 to rotate precisely. In one embodiment, the module of the driving gear 52 is 0.7, and the number of teeth Z of the driving gear 52 is 0.7. 1 is 17.

[0070] In some embodiments, the driving gear 52 is provided with an axial hole. The output shaft of the driving member 51 is passed through the axial hole. Figure 3 As shown, the driving gear 52 is further provided with a locking hole 54. The locking hole 54 is radially connected between the shaft hole and the outer peripheral side of the driving gear 52. The fastener is threadedly inserted into the locking hole 54, and the fastener is arranged to abut against the output shaft of the driving member 51, so that the driving gear 52 can be restricted from moving relative to the output shaft of the driving member 51 in the axial direction, thereby improving the connection stability between the driving gear 52 and the driving member 51. In some embodiments, the fastener is a screw.

[0071] In some embodiments, the axial length of the driving gear 52 is not less than the axial distance between the two ends of the curved track groove 211 .

[0072] In some embodiments, the optical lens 800 includes a convex lens 801. The convex lens 801 plays a role of focusing light. Specifically, the convex lens 801 is accommodated in the second peripheral wall 32.

[0073] In some embodiments, in combination Figure 7 and Figure 8 As shown, the optical lens 800 includes a convex lens 801 and a concave lens 802. Specifically, when the concave lens 802 overlaps with the convex lens 801 on the optical path, chromatic aberration can be eliminated and the appearance of halo in the light spot can be reduced. The convex lens 801 and the concave lens 802 are accommodated in the second peripheral wall 32. More specifically, a convex surface of the convex lens 801 is fitted with a concave surface of the concave lens 802. In some embodiments, the step transition surface 321 is arranged to abut against the mirror edge of the convex lens 801. More specifically, the shape of the step transition surface 321 is arranged corresponding to the shape of the mirror edge of the convex lens 801, so that there is a larger fitting area between the step transition surface 321 and the mirror edge of the convex lens 801, ensuring that the convex lens 801 can be stably fixed by the sliding bracket 30 without changing the optical position.

[0074] In some embodiments, in combination Figures 7 to 9As shown, the focusing device 100 further includes a fixing frame 60 connected to the sliding bracket 30. The fixing frame 60 is partially accommodated in the second peripheral wall 32 and abuts against the mirror edge of the concave lens 802. Since the convex lens 801 and the concave lens 802 are arranged in close contact, the convex lens 801 is abutted by the step transition surface 321, and the concave lens 802 is abutted by the fixing frame 60, so that the convex lens 801 and the concave lens 802 can be stably installed in the sliding bracket 30.

[0075] In some embodiments, in combination Figures 7 to 9 As shown, the fixing frame 60 includes a step portion 61 and a flange portion 62 connected to the step portion 61. The step portion 61 is used to be accommodated in the second peripheral wall 32 and abut against the mirror edge of the concave lens 802. The flange portion 62 is used to position and connect the sliding bracket 30. In some embodiments, the fastener is inserted through the flange portion 62 and the outer ring portion 33 of the sliding bracket 30. In some embodiments, a through hole 64 is provided on the flange portion 62. A second screw hole 331 is provided on the outer ring portion 33. The fastener is inserted through the through hole 64 and the second screw hole 331. In some embodiments, the through hole 64 is a countersunk hole. Further, the flange portion 62 is arranged opposite to the outer ring portion 33. The outer ring portion 33 is connected to a first boss portion 332, and the first boss portion 332 is arranged on the side of the outer ring portion 33 facing the flange portion 62. The second screw hole 331 is arranged in the first boss portion 332. More specifically, the outer ring portion 33 is connected to four first boss portions 332. The four first boss portions 332 are evenly spaced apart along the circumferential direction of the outer ring portion 33 .

[0076] In some embodiments, in combination Figure 8 and Fig. 9 As shown, the outer ring portion 33 is connected to a positioning portion 333. The flange portion 62 is provided with a hole 63 corresponding to the positioning portion 333. The positioning portion 333 is inserted into the hole 63, so as to play a positioning role between the sliding and the fixed frame 60.

[0077] In some other embodiments, the fixing frame 60 may be threadedly engaged with the inner wall surface of the second peripheral wall 32 so as to maintain a position relative to the sliding bracket 30 , so that the fixing frame 60 can support the mirror edge of the concave lens 802 .

[0078] In some other embodiments, the outer periphery of the convex lens 801 and the concave lens 802 may also be interference fit with the inner periphery of the second peripheral wall 32 , so that the convex lens 801 and the concave lens 802 are fixed in the sliding bracket 30 without the aid of the fixing frame 60 .

[0079] In some embodiments, in combination Figure 3 and Fig. 9As shown, the focusing device 100 further includes a limit assembly. The limit assembly is used to limit the circumferential rotation range of the sliding bracket 30 relative to the zoom lens barrel 20, thereby avoiding the formation of overpressure between the slider 31 and the curved track groove 211, and preventing the sliding bracket 30 from being damaged. Figure 3 and Fig. 9 As shown, the limit assembly includes a magnet connected to the sliding bracket 30 and a limit sensor element 71 connected to the mounting bracket 40. Specifically, the magnet rotates with the sliding bracket 30. The position of the limit sensor element 71 is set corresponding to the rotation trajectory of the magnet. When the limit sensor element 71 recognizes the magnet, the limit sensor element 71 generates an induction signal. The driving member 51 stops running under the feedback of the induction signal, thereby limiting the rotation range of the sliding bracket 30. In some embodiments, the limit sensor element 71 is a Hall sensor.

[0080] In some embodiments, in combination Figure 8 and Fig. 9 As shown, the flange portion 62 is provided with a mounting hole 65, and the mounting hole 65 is used to clamp the magnet. The outer ring portion 33 is also connected to a second boss portion 334, and the second boss portion 334 is used to resist the magnet so that the magnet is installed at a predetermined position.

[0081] In some embodiments, in combination Figure 7 As shown, after the sliding bracket 30, the optical lens 800 and the fixed frame 60 are assembled into a module, the module is assembled with the zoom lens barrel 20. The three sliders 31 on the sliding bracket 30 are aligned with the three avoidance grooves 25 of the zoom lens barrel 20. The sliders 31 and the avoidance grooves 25 are assembled as interference fit. The zoom lens barrel 20 is pressed hard to squeeze the three sliders 31 into the curved track grooves 211. After the sliding bracket 30, the optical lens 800, the fixed frame 60 and the zoom lens barrel 20 form a new module, the module is assembled with the zoom lens barrel 20. Figure 3 As shown, the new module is fixed to the mounting frame 40. Thereafter, the driving member 51 is fixed to the mounting frame 40, and the driving gear 52 is sleeved on the output shaft of the driving member 51.

[0082] In some embodiments, after the driving member 51 is powered on, the output shaft of the driving member 51 drives the driving gear 52 to rotate, and the driving gear 52 drives the sliding bracket 30 to rotate. Since the zoom lens barrel 20 is fixed on the mounting frame 40, the angle of the zoom lens barrel 20 relative to the mounting frame 40 remains unchanged. The three curved track grooves 211 on the zoom lens barrel 20 support and guide the three sliders 31 of the sliding bracket 30, so that the sliding bracket 30 can rotate relative to the zoom lens barrel 20 in the circumferential direction while also moving relative to the zoom lens barrel 20 in the axial direction. The optical lens 800 moves with the sliding bracket 30, and the optical lens 800 can rotate relative to the zoom lens barrel 20 in the circumferential direction while also moving relative to the zoom lens barrel 20 in the axial direction. When the sliding bracket 30 is meshed with the driving gear 52 for transmission, the sliding bracket 30 also moves linearly along the axial direction of the driving gear 52. By converting the circular motion of the driving member 51 into the linear motion required for focusing of the optical lens 800, the axial position of the optical lens 800 is changed at a uniform speed, so that the distance between the optical lens 800 and the light source device can be adjusted to achieve the purpose of focusing.

[0083] The present application also provides a method for processing a zoom lens barrel, which is used to process and manufacture the zoom lens barrel 20. Fig.10 As shown, the processing method of the zoom lens barrel includes the following steps:

[0084] S10: Provide lens barrel blanks;

[0085] S20: Install the lens barrel blank on the processing table;

[0086] S30: According to the movable range of the sliding bracket 30 relative to the zoom lens barrel 20, the two end positions of the curved track groove 211 are determined on the lens barrel blank, and the two end positions of the curved track groove correspond to the boundaries of the movable range of the sliding bracket 30 respectively;

[0087] S40: within the circumferential angle range between the two ends of the curved track groove 211, a plurality of angle values ​​are divided for the lens barrel blank; within the height range between the two ends of the curved track groove 211, a plurality of height values ​​are divided for the lens barrel blank; the number of angle values ​​corresponds to the number of height values;

[0088] S50: Make the tool cut through each height mark in the axial direction relative to the lens barrel blank, and make the tool cut through each angle mark in the circumferential direction relative to the lens barrel blank; when the position of the tool relative to the lens barrel blank matches a set of corresponding height marks and angle marks, make the tool start to move to another height mark relative to the lens barrel blank, and make the tool start to rotate to another angle mark relative to the lens barrel blank synchronously. Specifically, in the case where the positions of the two ends of the curved track groove 211 are different, the shape and length of the curved track groove 211 will change, thereby forming zoom lens barrels 20 of different specifications. After determining the end point position of the curved track groove 211 on the lens barrel blank, use the cutting tool to cut and move from the starting position of the curved track groove 211 to the end point position of the curved track groove 211. Since the positions of the two ends of the curved track groove 211 can be freely selected before the tool is cut, zoom lens barrels 20 of different specifications can be formed by cutting the lens barrel blank with the tool, effectively reducing the manufacturing cost of the zoom lens barrel 20.

[0089] When the tool is used to process the curved track groove on the lens barrel blank, the tool can move relatively along the axial direction of the lens barrel blank, and can rotate relatively along the circumference of the lens barrel blank. However, there may be differences in the control accuracy of the axial movement speed or the circumferential rotation speed of the tool. For example, the control accuracy of the axial movement speed is ±5%, while the control accuracy of the circumferential rotation speed is ±10%. After the tool starts to cut the lens barrel blank, the difference in control accuracy will cause the processing error to be difficult to offset. As time accumulates, the deviation of the axial movement distance and the circumferential rotation angle will gradually increase, resulting in a large deviation between the end of the curved track groove 211 and the original end point position. Since a number of angle values ​​and a number of height values ​​are divided between the two ends of the curved trajectory groove 211, each time the tool cuts the lens barrel blank, it only performs a small axial movement and circumferential rotation relative to the lens barrel blank. The small axial movement and circumferential rotation are less affected by the difference in control accuracy. Moreover, only after the position of the tool relative to the lens barrel blank matches a set of corresponding height values ​​and angle values, the tool will start to move relative to the lens barrel blank to another height value, and the tool will start to rotate relative to the lens barrel blank to another angle value synchronously, thereby avoiding the accumulation of control accuracy errors over time and making the processing of the curved trajectory groove 211 more precise.

[0090] For step S10, in some embodiments, the lens barrel blank includes a first peripheral wall 21, a reinforcing block 22 connected to the first peripheral wall 21, a supporting block 23 connected to the reinforcing block 22, and a convex ring portion 24 connected to the first peripheral wall 21. The first peripheral wall 21 has not yet formed a curved track groove 211. Specifically, the lens barrel blank can be manufactured by mold forming.

[0091] For step S20, in some embodiments, the processing table can be rotatably arranged, and when the tool is made to sequentially cut through each angle value along the circumferential direction relative to the lens barrel blank, the processing table is used to drive the lens barrel blank to rotate along the circumferential direction, so that the processing table can drive the lens barrel blank to rotate along the circumferential direction and ensure the stability of the lens barrel blank to rotate along the circumferential direction. In some embodiments, the rotation axis of the processing table coincides with the central axis of the lens barrel blank.

[0092] For step S30, specifically, since the two end positions of the curved track groove correspond to the boundaries of the movable range of the sliding bracket 30, after the two end positions of the curved track groove are determined, it can be ensured that the sliding bracket 30 can obtain the movable range required for focusing. In addition, the number of angle scale values ​​corresponds to the number of height scale values. At the same time, in the case where the curved track groove changes evenly, the point defined by an angle scale value and a corresponding height scale value must also be in the curved track groove.

[0093] In one embodiment, the starting position of the curved track groove 211 is (θ, H)=(15°, 2), and the ending position is (θ, H)=(105°, 14).

[0094] In some embodiments, when determining the positions of both ends of the curved track groove on the lens barrel blank, a second curve equation around the outer circumference of the lens barrel blank is set so that the curve defined by the second curve equation passes through both ends of the curved track groove 211. The second curve equation is defined by an arc length and a stroke; the arc length is defined by at least the radius and circumferential angle of the lens barrel blank; the stroke is defined by at least the circumferential angle of the lens barrel blank, thereby ensuring that the curved track groove 211 formed by processing is spiral or similar to a spiral.

[0095] For step S40, in some embodiments, a plurality of angle values ​​are arranged according to circumferential angles, the angle of the first angle value is the same as the angle of the starting point of the curved track groove 211, and the angle of the last angle value is the same as the angle of the end point of the curved track groove 211. A plurality of height values ​​are arranged according to axial heights, the height of the first height value is the same as the angle of the starting point of the curved track groove 211, and the height of the last height value is the same as the height of the end point of the curved track groove 211.

[0096] In some embodiments, the curved track groove 211 is divided into 100 segments between the starting point and the end point. Then the number of height values ​​and angle values ​​is 101 respectively. After the height value is combined with the corresponding angle value, it can represent the position of a point on the curve, for example (15°, 2),

[0097] In one embodiment, any two adjacent angle values ​​differ by an angle difference Δθ of the same size. In some embodiments, the angle difference between any two adjacent angle values ​​is no more than 9°, thereby limiting the circumferential rotation amplitude of the lens barrel blank each time, which is beneficial to reducing the processing deviation of the curved track groove 211. In one embodiment, the difference between two adjacent angle values ​​is 0.9°. Specifically, the rotation subdivision angle of the processing table is 0.9°. In other embodiments, the difference between two adjacent angle values ​​is 0.2°, 3° or 8°.

[0098] In some embodiments, there is a height difference ΔH of the same size between any two adjacent height values. In some embodiments, the height difference between any two adjacent height values ​​is no more than 1.2 mm, thereby limiting the linear movement amplitude of the lens barrel blank each time, which is beneficial to reduce the processing deviation of the curved trajectory groove 211. In one embodiment, there is a difference of 0.12 mm between two adjacent height values. In one embodiment, when the processing table drives the lens barrel blank to rotate 0.9° in the circumferential direction, the tool rises 0.12 mm in the axial direction relative to the processing table. After completing 100 sections of cutting, the curved trajectory groove 211 can be processed on the first peripheral wall 21.

[0099] In some other embodiments, the difference between two adjacent height values ​​is In some embodiments, the cutter diameter is 6 mm.

[0100] Specifically, the central axis of the tool is perpendicular to the central axis of the lens barrel blank. In some embodiments, the tool can be moved along the axial direction of the lens barrel blank driven by the lifting mechanism.

[0101] For step S50, in some embodiments, according to the outer radius and inner radius of the lens barrel blank, the distance of the tool relative to the central axis of the lens barrel blank is adjusted by moving the tool relative to the lens barrel blank along the radial direction of the lens barrel blank. In some embodiments, the outer radius of the first peripheral wall 21 is 48 mm, and the inner radius of the first peripheral wall 21 is 45 mm. In combination with the outer radius and the inner radius of the first peripheral wall 21, the distance between the tool and the central axis of the lens barrel blank can be set.

[0102] In some embodiments, in combination Fig.11As shown, the method for processing a zoom lens barrel further includes step S60: after the tool has passed all height values ​​corresponding to the same curved trajectory groove along the axial direction relative to the lens barrel blank, and the tool has passed all angle values ​​corresponding to the same curved trajectory groove along the circumferential direction relative to the lens barrel blank, the tool is moved away from the lens barrel blank, the lens barrel blank is rotated by an interval angle, and the tool starts cutting another curved trajectory groove 211. In some embodiments, after the first curved trajectory groove 211 is processed, the processing table drives the lens barrel blank to rotate 120° to find the processing position of the second curved trajectory groove 211. Specifically, the second curved trajectory groove 211 and the third curved trajectory groove 211 can be processed in the same way.

[0103] In some embodiments, when the tool reaches a height mark, it is determined whether the tool has reached an angle mark corresponding to the height mark. If the tool has not reached the angle mark corresponding to the height mark, the relative axial movement of the tool stops, and the relative circumferential rotation continues until the tool reaches the angle mark corresponding to the height mark. After the tool also reaches the angle mark corresponding to the height mark, the position of the tool relative to the lens barrel blank matches a set of corresponding height marks and angle marks.

[0104] In some embodiments, when the tool reaches an angle mark, it is determined whether the tool has reached a height mark corresponding to the angle mark. If the tool has not reached the height mark corresponding to the angle mark, the relative circumferential rotation of the tool stops, and the relative axial movement continues until the tool reaches the height mark corresponding to the angle mark. After the tool also reaches the height mark corresponding to the angle mark, the position of the tool relative to the lens barrel blank matches a set of corresponding height marks and angle marks.

[0105] The above implementation modes are merely descriptions of the preferred implementation modes of the present application, and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements made to the technical solutions of the present application by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present application.

Claims

1. A method for processing a zoom lens barrel, characterized in that: The steps include: S10: Provide lens barrel blanks; S20: installing the lens barrel blank on a processing table; S30: determining two end positions of a curved track groove on the lens barrel blank according to the movable range of the sliding bracket relative to the zoom lens barrel, wherein the two end positions of the curved track groove correspond to the boundaries of the movable range of the sliding bracket respectively; S40: within the circumferential angle range between the two ends of the curved track groove, the lens barrel blank is divided into a plurality of angle values; within the height range between the two ends of the curved track groove, the lens barrel blank is divided into a plurality of height values; the number of the angle values ​​corresponds to the number of the height values; S50: enabling the tool to sequentially cut through each of the height values ​​in the axial direction relative to the lens barrel blank, and enabling the tool to sequentially cut through each of the angle values ​​in the circumferential direction relative to the lens barrel blank; when the tool reaches a height value, determining whether the tool has reached an angle value corresponding to the height value; if the angle value corresponding to the height value has not been reached, the relative axial movement of the tool stops, and the relative circumferential rotation continues until the tool reaches the angle value corresponding to the height value; when the tool reaches an angle value, determining whether the tool has reached the height value corresponding to the angle value; If the height value corresponding to the angle value is not reached, the relative circumferential rotation of the tool stops and the relative axial movement continues until the tool reaches the height value corresponding to the angle value; when the position of the tool relative to the lens barrel blank matches a set of corresponding height values ​​and angle values, the tool starts to move relative to the lens barrel blank toward another height value, and the tool synchronously starts to rotate relative to the lens barrel blank toward another angle value.

2. The method for processing a zoom lens barrel according to claim 1, characterized in that: The angle difference between any two adjacent angle values ​​is the same; the height difference between any two adjacent height values ​​is the same.

3. The method for processing a zoom lens barrel according to claim 2, characterized in that: The angle difference between any two adjacent angle values ​​is not greater than 9°; the height difference between any two adjacent height values ​​is not greater than 1.2 mm.

4. The method for processing a zoom lens barrel according to claim 1, characterized in that: According to the outer radius and the inner radius of the lens barrel blank, the distance of the tool relative to the central axis of the lens barrel blank is adjusted by moving the tool along the radial direction of the lens barrel blank.

5. The method for processing a zoom lens barrel according to claim 1, characterized in that: When the tool is made to sequentially cut through each of the angle values ​​along the circumferential direction relative to the lens barrel blank, the processing table is used to drive the lens barrel blank to rotate along the circumferential direction.

6. The method for processing a zoom lens barrel according to claim 1, characterized in that: When determining the positions of both ends of the curved trajectory groove on the lens barrel blank, a curve equation surrounding the outer circumference of the lens barrel blank is set; the curve defined by the curve equation passes through both ends of the curved trajectory groove; the curve equation is defined by an arc length and a stroke; the size of the arc length is at least defined by the radius and circumferential angle of the lens barrel blank; the size of the stroke is at least defined by the circumferential angle of the lens barrel blank.

7. The method for processing a zoom lens barrel according to claim 1, characterized in that: The method further includes step S60: after the tool has passed all height values ​​corresponding to the same curved trajectory groove along the axial direction relative to the lens barrel blank, and the tool has passed all angle values ​​corresponding to the same curved trajectory groove along the circumferential direction relative to the lens barrel blank, the tool is moved away from the lens barrel blank, the lens barrel blank is rotated by an interval angle, and the tool starts cutting another curved trajectory groove.

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