Automatic focusing mechanism

Abstract

The invention discloses an automatic focusing mechanism which is used for adjusting the focal length of a camera, the automatic focusing mechanism comprises a center piece, a driving wheel, a connecting rod assembly, a belt, a first driving piece and a second driving piece, and the driving wheel is connected with the center piece; the connecting rod assembly is movably connected with the center piece, center connecting lines of the first connecting part, the second connecting part and the driving wheel form a triangle, meanwhile, the first connecting part is connected with a first pulley, and the second connecting part is connected with a second pulley; the belt is in transmission connection with the driving wheel, the first pulley and the second pulley; the first driving piece is connected with the center piece and used for driving the connecting rod assembly to move so that the belt can be switched between the tensioning state and the loosening state along with movement of the connecting rod assembly. The second driving piece is connected with the center piece and used for driving the driving wheel to rotate; when the belt is in the tensioning state, the belt is further used for being in transmission connection with a focusing rotary knob of the camera so as to drive the focusing rotary knob to rotate, automatic focusing of the camera is achieved, and the focusing precision is met.

Description

Technical Field

[0001] The present application relates to the field of camera focusing, and in particular to an automatic focusing mechanism. Background Art

[0002] At present, for the focusing process during the installation of the lens, the focus of the general fixed-focus lens is adjusted manually, with the purpose of making the test pattern at the fixed position clear to determine whether the focal length is adjusted properly. However, manual focusing often has great defects. It is only suitable for some large spaces that are convenient for direct manual operation, and the manual focusing accuracy is low, and it is not easy to obtain the best camera imaging effect. For the focusing process of the panoramic lens, the focusing must be carried out in an auxiliary box, the space is narrow, it is not convenient to operate directly by hand, and the focusing accuracy is required to be high. It requires extremely high precision, but it is not convenient to operate directly by hand, and the lens position needs to be adjusted in real time.

[0003] There is an urgent need to develop an automatic focusing mechanism to ensure the focusing effect of the camera. Summary of the invention

[0004] The present application mainly provides an automatic focusing mechanism, which can have a good use effect when applied.

[0005] In order to solve the above technical problems, the technical solution adopted in the present application is: to provide an automatic focusing mechanism, which is used to adjust the focal length of the camera, and includes a center piece, a driving wheel, a connecting rod assembly, a belt, a first driving member and a second driving member, wherein the driving wheel is connected to the center piece; the connecting rod assembly is movably connected to the center piece, and the connecting rod assembly includes a first connecting part and a second connecting part, and the center line of the first connecting part, the second connecting part and the driving wheel forms a triangle, and the first connecting part is connected to a first pulley, and the second connecting part is connected to a second pulley; the driving wheel, the first pulley and the second pulley are connected by a belt transmission; the first driving member is connected to the center piece, and is used to drive the connecting rod assembly to move, so that as the connecting rod assembly moves, the belt switches between a tensioned state and a relaxed state; the second driving member is connected to the center piece, and is used to drive the driving wheel to rotate; wherein, when the belt is in the tensioned state, the belt is also used to be connected to the focusing knob of the camera to drive the focusing knob to rotate.

[0006] In which, the connecting rod assembly includes a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod which are movably connected in sequence from head to tail; the first connecting rod and the fourth connecting rod are connected to a sliding member after being movably connected at their ends, and the sliding member is slidably connected to the center member and can slide along the extension direction of the center member; the first connecting part is formed at the movably connected place between the first connecting rod and the second connecting rod, the second connecting part is formed at the movably connected place between the third connecting rod and the fourth connecting rod, and the second connecting rod is movably connected to the first position of the center member after being movably connected to the third connecting rod; the first driving member is used to drive the sliding member to slide along the extension direction of the center member, wherein, when the first driving member drives the sliding member to slide toward the first position, the belt is gradually tightened until the sliding member moves to the extreme position.

[0007] Among them, the sliding part is a screw nut, and the center part includes a screw and a center connecting rod, wherein the screw nut is slidably connected to the screw; the center connecting rod has the same extension direction as the screw and is connected to the screw, and the second connecting rod is movably connected to the third connecting rod and then movably connected to the first position of the center part.

[0008] Wherein, the screw rod has a sliding groove, and the screw rod nut slides in the sliding groove.

[0009] Wherein, the first connecting rod and the fourth connecting rod are symmetrically arranged with respect to the center piece, and the second connecting rod and the third connecting rod are symmetrically arranged with respect to the center piece.

[0010] Wherein, the material of the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod includes 6061 aluminum alloy.

[0011] Wherein, the automatic focusing mechanism also includes a fixed rod and a third pulley, wherein the fixed rod is connected to the center piece, the third pulley is connected to the fixed rod, and the extension direction of the third pulley and the driving wheel is the same as the extension direction of the center piece; wherein, when the sliding member moves toward the first position to the extreme position, the third pulley is simultaneously connected to the belt between the first pulley and the focusing knob, and the belt between the second pulley and the focusing knob.

[0012] Wherein, the fixing rod is provided with a fixing portion for mounting the automatic focusing mechanism on the target element.

[0013] Wherein, the belt is elastic, and the material of the belt includes thermoplastic polyurethane rubber.

[0014] Wherein, the belt is transparent.

[0015] The beneficial effect of the present application is that in the automatic focusing mechanism of the present application, the belt is connected to the focusing knob of the camera through a transmission connection. After the connecting rod assembly is clamped, the friction between the belt and the focusing knob is increased. When the belt rotates, the focusing knob is driven to rotate, thereby realizing automatic focusing of the camera while meeting the focusing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0017] Figure 1 This is a front structural schematic diagram of an embodiment of the automatic focusing mechanism in the present application;

[0018] Figure 2 for Figure 1 A schematic diagram of the back structure of an automatic focusing mechanism in one embodiment;

[0019] Figure 3 for Figure 1 A structural schematic diagram of an embodiment of the automatic focusing mechanism in the unclamped state in the focusing box.

[0020] Figure 4 for Figure 1 A structural schematic diagram of an embodiment of the automatic focusing mechanism in the clamped state in the focusing box.

[0021] Figure 5 Figure 1 A structural schematic diagram of an implementation scheme in which the automatic focusing mechanism is fixed on a support base.

[0022] Explanation of the reference numerals: 100 automatic focusing mechanism; 10 center piece; 11 sliding piece; 12 first position; 13 screw rod; 131 sliding groove; 14 center connecting rod; 20 driving wheel; 30 connecting rod assembly; 31 first connecting part; 32 second connecting part; 33 first pulley; 34 second pulley; 35 first connecting rod; 36 second connecting rod; 37 third connecting rod; 38 fourth connecting rod; 40 belt; 50 first driving member; 60 second driving member; 70 fixing rod; 71 fixing part; 80 third pulley; 90 focusing box; 91 focusing knob; 92 supporting seat; 93 mounting bracket. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not 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 this application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0025] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0028] See also Figure 1 and Figure 2The present application provides an automatic focusing mechanism 100, which is used to adjust the focal length of a camera. The automatic focusing mechanism 100 includes a center piece 10, a driving wheel 20, a connecting rod assembly 30, a belt 40, a first driving member 50 and a second driving member 60, wherein the driving wheel 20 is connected to the center piece 10; the connecting rod assembly 30 is movably connected to the center piece 10, and includes a first connecting portion 31 and a second connecting portion 32. The center line of the first connecting portion 31, the second connecting portion 32 and the driving wheel 20 forms a triangle, and the first connecting portion 31 is connected to a first pulley 33. The second connecting part 32 is connected to the second pulley 34; the belt 40 is connected to the driving wheel 20, the first pulley 33 and the second pulley 34 in a transmission manner; the first driving member 50 is connected to the central member 10, and is used to drive the connecting rod assembly 30 to move, so that as the connecting rod assembly 30 moves, the belt 40 switches between a tensioned state and a relaxed state; the second driving member 60 is connected to the central member 10, and is used to drive the driving wheel 20 to rotate; wherein, when the belt 40 is in a tensioned state, the belt 40 is also used to be connected to the focusing knob 91 of the camera in a transmission manner to drive the focusing knob 91 to rotate.

[0029] Specifically, the driving wheel 20 is fixed on the center piece 10, and the center piece 10 plays the role of supporting the overall structure. The center piece 10 is movably connected to the connecting rod assembly 30, so that the connecting rod assembly 30 can be clamped and opened. The design of the center piece 10 facilitates the control of the connecting rod assembly 30. The connecting rod assembly 30 includes a first connecting portion 31 and a second connecting portion 32. The first connecting portion 31 and the second connecting portion 32 play a hinged role, which facilitates the clamping movement of the connecting rod assembly 30. At the same time, the connecting line of the first connecting portion 31, the second connecting portion 32 and the center of the driving wheel 20 forms a triangle, which is convenient for the transmission of the belt 40. Specifically, a first pulley 33 is set at the position of the first connecting portion 31, and a second pulley 34 is set at the position of the second connecting portion 32. The belt 40 contacts the first pulley 33, the second pulley 34 and the driving wheel 20, and rotates around the first pulley 33, the second pulley 34 and the driving wheel 20, as shown in FIG. Figure 3 As shown, when the link assembly 30 is in the open state, the belt 40 is in the relaxed state; Figure 4 As shown, when the connecting rod assembly 30 is gradually clamped, the belt 40 is in a tensioned state. In the present application, the first driving member 50 is designed to control the opening and clamping state of the connecting rod assembly 30, and the second driving member 60 is designed to drive the driving wheel 20 to rotate, and the driving wheel 20 rotates to drive the focusing knob 91 to rotate. Specifically, during automatic focusing, the belt 40 contacts the focusing knob 91, and the first driving member 50 is first used to drive the connecting rod assembly 30 to clamp, and then the second driving member 60 is used to drive the driving wheel 20 to rotate. At this time, the driving wheel 20 rotates to drive the belt 40 to rotate, and the belt 40 rotates to drive the focusing knob 91 to rotate. When the focused image is clear, the fully automatic focusing is completed.

[0030] In one embodiment, the first driving member 50 and the second driving member 60 are small reduction motors of CHF-GM12-N10VA. The reduction motors have high precision and are easy to adjust to a suitable position when adjusting the focus knob 91.

[0031] In the automatic focusing mechanism 100 of the present application, the belt 40 is connected to the focusing knob 91 of the camera through a transmission connection. After the connecting rod assembly 30 is clamped, the friction between the belt 40 and the focusing knob 91 is increased. When the belt 40 rotates, it drives the focusing knob 91 to rotate, thereby realizing automatic focusing of the camera while meeting the focusing accuracy.

[0032] Continue reading Figure 1 The connecting rod assembly 30 includes a first connecting rod 35, a second connecting rod 36, a third connecting rod 37 and a fourth connecting rod 38 which are movably connected in sequence from head to tail; the ends of the first connecting rod 35 and the fourth connecting rod 38 are movably connected and then connected to the sliding member 11, and the sliding member 11 is slidably connected to the center member 10 and can slide along the extension direction of the center member 10; the first connecting rod 35 and the second connecting rod 36 are movably connected to form a first connecting portion 31, and the third connecting rod 37 and the fourth connecting rod 38 are movably connected to form a second connecting portion 32, and the second connecting rod 36 and the third connecting rod 37 are movably connected to the first position 12 of the center member 10; the first driving member 50 is used to drive the sliding member 11 to slide along the extension direction of the center member 10, wherein, when the first driving member 50 drives the sliding member 11 to slide toward the first position 12, the belt 40 is gradually tightened until the sliding member 11 moves to the extreme position.

[0033] Specifically, the first link 35, the second link 36, the third link 37 and the fourth link 38 in the link assembly 30 are connected end to end in sequence, and the sliding member 11 is connected to the ends of the first link 35 and the fourth link 38. Since the sliding member 11 is slidably connected to the center member 10 and can slide along the extension direction of the center member 10, when the sliding member 11 slides, it drives the first link 35 and the fourth link 38 to slide along the extension direction of the center member 10. At the same time, the ends of the second link 36 and the third link 37 are movably connected to the first position 12 of the center member 10, and the second link 36 and the third link 37 rotate around the first position 12. When the first driving member 50 drives the sliding member 11 to slide toward the first position 12, the first connecting rod 35 and the fourth connecting rod 38 are driven to move toward the first position 12. At this time, the first connecting portion 31 and the second connecting portion 32 gradually approach each other, and the connecting rod assembly 30 is clamped, driving the belt 40 to gradually tighten. When the sliding member 11 moves to the extreme position, the belt 40 is in the tightest state, and the friction between the belt 40 and the focusing knob 91 is the largest.

[0034] Please continue reading Figure 1 and Figure 2, the sliding member 11 is a screw nut, the center member 10 includes a screw 13 and a center connecting rod 14, wherein the screw nut is slidably connected to the screw 13; the center connecting rod 14 extends in the same direction as the screw 13 and is connected to the screw 13, and the second connecting rod 36 is movably connected to the third connecting rod 37 and then movably connected to the first position 12 of the center member 10. Specifically, the center member 10 includes a screw 13 and a center connecting rod 14 connected to each other, and the sliding member 11 is a screw nut. The size and shape of the screw 13 and the screw nut can be customized as needed, and the design is flexible, which can adapt to the use scenario of the automatic focusing mechanism 100 and meet the use needs.

[0035] Please continue reading Figure 1 and Figure 2 The screw rod 13 has a sliding groove 131, and the screw nut slides in the sliding groove 131. Specifically, the screw rod 13 is provided with a sliding groove 131, and the screw nut slides in the sliding groove 131 to drive the connecting rod assembly 30 to move. The design of the sliding groove 131 is simple and easy to prepare.

[0036] Please continue reading Figure 1 The first connecting rod 35 and the fourth connecting rod 38 are symmetrically arranged with respect to the center piece 10, and the second connecting rod 36 and the third connecting rod 37 are symmetrically arranged with respect to the center piece 10. Specifically, the first connecting rod 35 and the fourth connecting rod 38 are active connecting rods, and the second connecting rod 36 and the third connecting rod 37 are driven connecting rods. The two-to-two symmetrical design has a simple structure and is easy to process. At the same time, the first connecting portion 31 and the second connecting portion 32 are symmetrically arranged, which is convenient for ensuring the stability of the subsequent belt 40 during rotation.

[0037] In one embodiment, the material of the first connecting rod 35, the second connecting rod 36, the third connecting rod 37 and the fourth connecting rod 38 includes 6061 aluminum alloy. Specifically, 6061 aluminum alloy has medium strength and light weight characteristics, wherein the tensile strength of 6061 aluminum alloy can reach 290MPa, and the yield strength is 240MPa, which can meet the strength requirements of the connecting rod. At the same time, its density is about 2.7g / cm3, which is much lower than many metal materials. It is light in weight and widely used, which can effectively reduce the weight of the structure. At the same time, it has good toughness, good fatigue resistance, good dimensional stability, is not easy to deform, and can ensure the accuracy and quality of the product. The above advantages make the automatic focusing mechanism 100 light in weight and easy to carry.

[0038] Please continue reading Figure 1 and Figure 2The automatic focusing mechanism 100 also includes a fixed rod 70 and a third pulley 80, wherein the fixed rod 70 is connected to the center piece 10, and the third pulley 80 is connected to the fixed rod 70, and the extension direction of the third pulley 80 and the driving wheel 20 is the same as the extension direction of the center piece 10; wherein, when the sliding member 11 moves toward the first position 12 to the extreme position, the third pulley 80 is simultaneously connected to the belt 40 between the first pulley 33 and the focusing knob 91 and the belt 40 between the second pulley 34 and the focusing knob 91.

[0039] Specifically, Figure 3 and Figure 4 As shown, the fixed rod 70 remains stationary during the movement of the connecting rod assembly 30, and the fixed rod 70 is connected to the center piece 10. In one embodiment, the fixed rod 70 and the center connecting rod 14 can be an integral structure. At the same time, the third pulley 80, the driving wheel 20 and the extension direction of the center piece 10 are on the same straight line. Among them, when the sliding member 11 moves to the extreme position toward the first position 12, the connecting rod assembly 30 is clamped, driving the belt 40 to be tensioned, and the third pulley 80 is simultaneously connected to the belt 40 between the first pulley 33 and the focusing knob 91 and the belt 40 between the second pulley 34 and the focusing knob 91, further increasing the tension of the belt 40.

[0040] See also Figure 1 and Figure 5 The fixing rod 70 is provided with a fixing portion 71 for mounting the automatic focusing mechanism 100 on the target element. Specifically, the fixing portion 71 includes a threaded hole. When focusing, the fixing rod 70 is fixed to a support seat 92 of the focusing box 90, and a mounting frame 93 is provided on the support seat 92 for connecting with the fixing portion 71 to achieve the fixing of the automatic focusing mechanism 100 in the focusing box 90.

[0041] In one embodiment, the belt 40 is elastic, and the material of the belt 40 includes thermoplastic polyurethane rubber (TPU). Specifically, thermoplastic polyurethane rubber has the advantages of high strength, high elasticity, wear resistance and tear resistance. Among them, TPU has very high tensile strength and tear strength, which are higher than most synthetic rubbers and natural rubbers, and can withstand large external forces and loads without being easily damaged; in addition, its elastic modulus is between rubber and plastic, and its hardness range is wide, from Shore A60 to Shore D80. It has good elasticity in the entire hardness range, and can maintain flexibility without plasticizers in a wide temperature range (-40°C to 120°C), which can adapt to different use environments and requirements. It also has excellent wear resistance and tear resistance, can maintain stable shape and performance during long-term use, and is suitable for occasions that require frequent friction and withstand large tension. Therefore, TPU can meet the use requirements of the belt 40.

[0042] In one embodiment, the belt 40 is transparent. By using a TPU transparent belt 40, light can pass through the transparent belt 40, eliminating the influence of the belt 40 on light during the focusing process. In addition, the application of the automatic focusing mechanism 100 can eliminate the shielding of light by manual adjustment.

[0043] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An automatic focusing mechanism, characterized in that: The automatic focusing mechanism is used to adjust the focal length of the camera, and includes: Centerpiece; a driving wheel connected to the center piece; A connecting rod assembly is movably connected to the central member, comprising a first connecting portion and a second connecting portion, wherein a center line of the first connecting portion, the second connecting portion and the driving wheel forms a triangle, and the first connecting portion is connected to a first pulley, and the second connecting portion is connected to a second pulley; A belt, drivingly connecting the driving wheel, the first pulley and the second pulley; A first driving member connected to the central member and used to drive the connecting rod assembly to move, so that the belt switches between a tensioned state and a relaxed state as the connecting rod assembly moves; A second driving member, connected to the central member, for driving the driving wheel to rotate; Wherein, when the belt is in the tensioned state, the belt is also used to be transmission-connected with the focus knob of the camera to drive the focus knob to rotate.

2. The automatic focusing mechanism according to claim 1, characterized in that: The connecting rod assembly comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod which are movably connected in sequence end to end; The ends of the first connecting rod and the fourth connecting rod are movably connected and then connected to a sliding member, and the sliding member is slidably connected to the central member and can slide along the extension direction of the central member; The first connecting part is formed by the movable connection between the first connecting rod and the second connecting rod, the second connecting part is formed by the movable connection between the third connecting rod and the fourth connecting rod, and the second connecting rod is movably connected to the first position of the central member after being movably connected to the third connecting rod; The first driving member is used to drive the sliding member to slide along the extension direction of the central member, wherein when the first driving member drives the sliding member to slide toward the first position, the belt is gradually tightened until the sliding member moves to the limit position.

3. The automatic focusing mechanism according to claim 2, characterized in that: The sliding member is a screw nut, and the center member includes: A screw rod, the screw rod nut being slidably connected to the screw rod; A central connecting rod extends in the same direction as the screw rod and is connected to the screw rod. The second connecting rod is movably connected to the third connecting rod and then movably connected to the first position of the center piece.

4. The automatic focusing mechanism according to claim 3, characterized in that: The screw rod has a sliding groove, and the screw rod nut slides in the sliding groove.

5. The automatic focusing mechanism according to claim 2, characterized in that: The first connecting rod and the fourth connecting rod are symmetrically arranged with respect to the center piece, and the second connecting rod and the third connecting rod are symmetrically arranged with respect to the center piece.

6. The automatic focusing mechanism according to claim 2, characterized in that: The material of the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod includes 6061 aluminum alloy.

7. The automatic focusing mechanism according to claim 2, characterized in that: The automatic focusing mechanism also includes: A fixing rod connected to the center piece, A third pulley is connected to the fixing rod, and the extending direction of the third pulley and the driving wheel is the same as the extending direction of the center piece; When the sliding member moves toward the first position to the extreme position, the third pulley is simultaneously connected to the belt between the first pulley and the focusing knob and the belt between the second pulley and the focusing knob.

8. The automatic focusing mechanism according to claim 7, characterized in that: The fixing rod is provided with a fixing portion for mounting the automatic focusing mechanism on a target element.

9. The automatic focusing mechanism according to claim 1, characterized in that: The belt is elastic, and the material of the belt includes thermoplastic polyurethane rubber.

10. The automatic focusing mechanism according to claim 9, characterized in that: The belt is transparent.

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