Variable aperture assembly and lens module thereof

Abstract

The invention discloses a variable aperture assembly and a lens module thereof. The variable aperture assembly comprises a base, a turntable, a plurality of blades and two groups of driving modules, the rotating disc is located between the base and the blade, the blade is connected with the rotating disc with two rails, and the two rails correspond to the two sets of driving modules respectively. And the two groups of driving modules are used for driving the turntables to rotate in opposite directions in a lever manner so as to drive the blades to correspondingly move. Each group of driving modules comprises a driving piece and a driven piece, when the driving piece is controlled to apply thrust to the driven piece, the stress bearing portion of the driven piece correspondingly generates restoring force, and the thrust and the restoring force cooperatively drive the driven piece to make contact with one of the two rails. Therefore, the aperture can be accurately adjusted.

Description

Technical Field

[0001] The invention relates to a camera element, in particular to a variable aperture assembly and a lens module thereof. Background Art

[0002] Generally, mobile phones or cameras with camera functions will control the amount of light entering the photosensitive element inside the body through the aperture. This aperture is usually set inside the lens, and the control of the amount of light affects the imaging quality of the lens. Summary of the invention

[0003] Since the current market demand pursues multi-functional or high-quality mobile phones or cameras, a micro lens module will be configured in a compact body space. The lens module can use a magnet and a coil to pull the blades to move centrifugally or centrifugally to control the size of the aperture. In order to achieve precise control of the aperture, the movement of the blades will be cut into multiple small movements. When electronic products need to be equipped with more blades or require the blades to have a larger angle of displacement to improve the image quality, however, the pulling force provided by the aforementioned driving method is too small, thereby limiting the function of the camera.

[0004] In addition, in order to prevent the blades from moving in the reverse direction during the movement, a reverse stop element, such as a reverse stop pawl, is usually required. This often leads to problems such as a larger space required for the lens module or an increased assembly cost.

[0005] In view of this, in one embodiment, a variable aperture assembly is provided, which includes a base, a turntable, a plurality of blades, a first driving module, and a second driving module. The blades are arranged in an annular manner on the base, the turntable is located between the base and the blades, the blades are connected to the turntable, the turntable has a first track and a second track, the first driving module corresponds to one of the first track and the second track of the turntable, and the second driving module corresponds to the other of the first track and the second track. The first driving module and the second driving module are used to drive the turntable to rotate in opposite directions respectively by levering, so as to drive the blades to move correspondingly. The first driving module and the second driving module each include an active member and a driven member, the active member and the driven member are arranged on the base, the driven member includes a stress bearing part fixed to the base, wherein when the active member is controlled to apply a thrust to the driven member, the stress bearing part generates a restoring force correspondingly, and the thrust and the restoring force cooperate to drive the driven member to contact one of the first track and the second track.

[0006] In some embodiments, the driven member further includes a force-bearing portion and a resistance portion, the active member applies a thrust to the force-bearing portion, the resistance portion connects the force-bearing portion and the stress-bearing portion, the resistance portion is parallel to the turntable, the stress-bearing portion has a curved section, the curved section generates a restoring force, wherein the thrust and the restoring force cooperatively drive the resistance portion to have a starting position and a contact position. When the resistance portion is at the contact position, the resistance portion contacts one of the first track and the second track. When the resistance portion is at the starting position, there is a gap between the resistance portion and the turntable.

[0007] In some embodiments, one end of the curved section is extendedly connected to the resistance portion, and the other end is fixed to the base.

[0008] In some embodiments, the active component includes a metal wire and a piezoelectric ceramic driving component, the metal wire is fixed to the base, the piezoelectric ceramic driving component is connected to the free end of the metal wire, and the piezoelectric ceramic driving component is substantially parallel to the force-bearing portion.

[0009] In some embodiments, the piezoelectric ceramic driving component applies a thrust to the force-bearing portion, and a thrust direction of the thrust forms an acute angle with a moving direction of the force-resisting portion from the starting position toward the contact position.

[0010] In some embodiments, the active member includes a shape memory alloy wire obliquely connected to the force-bearing portion of the driven member, the shape memory alloy wire applies a thrust to the force-bearing portion, and the thrust direction is substantially parallel to the movement direction of the resistance portion from the starting position to the contact position.

[0011] In some embodiments, an inclined surface of the teeth of one of the first track and the second track is substantially parallel to the shape memory alloy wire.

[0012] In some embodiments, the first track and the second track of the turntable are respectively a first toothed ratchet track and a second toothed ratchet track, the first toothed ratchet track corresponds to a first drive module, and the second toothed ratchet track corresponds to a second drive module, wherein the tooth directions of the first toothed ratchet track and the second toothed ratchet track are opposite, and the inner diameter of the first toothed ratchet track is smaller than the inner diameter of the second toothed ratchet track.

[0013] In some embodiments, the teeth of the first toothed ratchet track and the second toothed ratchet track are both straight teeth.

[0014] In some embodiments, the first track and the second track of the turntable are respectively a first friction track and a second friction track, and an inner diameter of the first friction track is smaller than an inner diameter of the second friction track.

[0015] In some embodiments, the variable aperture assembly further includes a magnetic ring and a Hall sensor, the magnetic ring is located on the turntable, the magnetic ring has a plurality of magnetic blocks, the polarity directions of two adjacent magnetic blocks are opposite, and the width of each magnetic block corresponds to a stroke of the turntable. In addition, the Hall sensor is located on the base and is used to sense the rotation position change of the turntable.

[0016] In some embodiments, the inner side of the turntable has a stop surface and a sliding surface, the inclination angle of the sliding surface is smaller than the inclination angle of the stop surface, and the stop surface contacts the outer surface of the base.

[0017] In some embodiments, the first driving module and the second driving module each further include a controller connected to the active member, and the controller is used to alternately power on and off the active member to control the active member to generate thrust.

[0018] On the other hand, an embodiment of the present invention further provides a lens module including a lens and the aforementioned variable aperture assembly, wherein the variable aperture assembly is disposed on the lens, and the variable aperture assembly is used to control the amount of light entering the lens.

[0019] In summary, the variable aperture assembly or its lens module of any embodiment utilizes the lever principle to generate pulling force, and the generated pulling force can be suitable for pulling more blades, and can also be converted into a longer stroke to meet the requirements of the structural design of electronic equipment. In addition, the variable aperture assembly has a simple structure and is easy to manufacture.

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional schematic diagram of a lens module according to some embodiments, with a dotted arrow indicating the direction of incident light;

[0022] Figure 2 is a three-dimensional schematic diagram of a variable aperture assembly according to some embodiments;

[0023] Figure 3 is an exploded schematic diagram of a variable aperture assembly according to some embodiments;

[0024] Figure 4 is a bottom view of a variable aperture assembly according to some embodiments, without showing a base;

[0025] Figure 5 is a three-dimensional schematic diagram of a turntable according to some embodiments;

[0026] Figure 6 yes Figure 5 An enlarged schematic diagram indicating the location of area B;

[0027] Figure 7 yes Figure 2 A schematic cross-sectional view at the position indicated by 7-7, and a partial enlarged schematic view at the position indicated by a dot chain line;

[0028] Figure 8 yes Figure 2An enlarged schematic diagram showing the position of region A, with a dotted arrow indicating the direction of movement of the resistance portion from the starting position toward the contact position;

[0029] Fig.9A is a three-dimensional schematic diagram of a follower according to some embodiments;

[0030] Fig. 9B is a schematic top view of a driven member of a second driving module according to some embodiments;

[0031] Fig. 9C is a schematic top view of a driven member of a first driving module according to some embodiments;

[0032] Fig.10 yes Figure 8 An enlarged schematic diagram showing the position of the C region, showing the second track portion in gray, with solid gray blocks indicating that the resistance portion is at the starting position, and dashed white blocks indicating that the resistance portion is at the contact position;

[0033] Fig.11 is a partially enlarged schematic diagram of a rotating disk and a driven member according to some embodiments, wherein the driven member is located at a starting position;

[0034] Fig.12 is a partially enlarged schematic diagram of a rotating disk, a driving member, and a driven member according to some embodiments; and

[0035] Fig.13 FIG. 4 is a partial enlarged schematic diagram of a magnetic ring, a rotating disk and a Hall sensor according to some embodiments, wherein the rotating disk is represented by a dotted line.

[0036] Wherein, the reference numerals are:

[0037] 10: Variable aperture assembly

[0038] 11: Magnetic ring

[0039] 110,110a,110b,110c: Magnetic blocks

[0040] 12: Base

[0041] 120: Groove

[0042] 121: Sensor fixing part

[0043] 122: Short Axis

[0044] 124: Turntable clamping part

[0045] 14: Turntable

[0046] 141: Positioning column

[0047] 142: Second Track

[0048] 143: First Track

[0049] 145: Sliding surface

[0050] 146: Stop surface

[0051] 147: Inclined surface

[0052] 148: Stop surface

[0053] 15:Leaf

[0054] 150: Aperture hole

[0055] 151: Positioning hole

[0056] 152: shaft hole

[0057] 16: Cover plate

[0058] 20:Driver module

[0059] 20A: First drive module

[0060] 20B: Second drive module

[0061] 21,21A,21B: Follower

[0062] 23,23A,23B: Active parts

[0063] 25A, 25B: Controller

[0064] 210: Stress bearing part

[0065] 211: Resistance Department

[0066] 212: Force bearing part

[0067] 213: Contact segment

[0068] 214: Bend section

[0069] 216: Fixed segment

[0070] 218: Outer edge

[0071] 219: Inner Edge

[0072] 231: Shape memory alloy wire

[0073] 232: Piezoelectric ceramic drive element

[0074] 233: Fixed block

[0075] 234:Metal Wire

[0076] 235: Slider

[0077] 30: Lens

[0078] 41: Hall sensor

[0079] F1: Thrust

[0080] F2: Resilience

[0081] D2: Moving direction

[0082] R1, R2: inner diameter

[0083] w1:interval

[0084] w2: width

[0085] P1: Starting position

[0086] P2: Contact position

[0087] S: Clearance

[0088] α: Angle

[0089] θ: Tilt angle DETAILED DESCRIPTION

[0090] See also Figure 1 , Figure 1 1 is a three-dimensional schematic diagram of a lens module according to some embodiments, with a dotted arrow indicating the direction of incident light. A lens module has a lens 30 and a variable aperture assembly 10, and the lens module is suitable for being arranged in an electronic device (not shown), such as a camera, a mobile phone, a tablet computer, a notebook computer, a wearable electronic device, a smart watch, an augmented reality (AR) device, a virtual reality (VR) device, or a device with a camera function. In addition, the variable aperture assembly 10 is arranged on the lens 30, and the variable aperture assembly 10 is used to control the amount of light entering the lens 30. For example, when taking pictures at night, the ambient light is dark, and the variable aperture assembly 10 can be controlled to enlarge the aperture so as to increase the amount of light entering the lens 30, so as to improve the imaging quality of the lens module.

[0091] See also Figure 2 , Figure 3 , Figure 4 and Figure 8 , Figure 2 is a three-dimensional schematic diagram of a variable aperture assembly 10 according to some embodiments; Figure 3 is an exploded schematic diagram of a variable aperture assembly 10 according to some embodiments; Figure 4 is a bottom view of the variable aperture assembly 10 according to some embodiments, without showing the base 12; Figure 8 yes Figure 2The enlarged schematic diagram indicating the position of region A uses a dotted arrow to indicate the moving direction D2 of the resistance portion 211 from the starting position P1 toward the contact position P2.

[0092] The variable aperture assembly 10 comprises a base 12, a plurality of blades 15, a rotating disk 14 and two sets of driving modules 20. Figure 3 The first driving module 20A and the second driving module 20B are respectively disposed on two sides of the base 12. Figure 3 The turntable 14 is located between the base 12 and the blades 15. The blades 15 are annularly arranged on the base 12 and form an aperture 150. These blades 15 are connected to the turntable 14. Figure 4 The turntable 14 has two tracks corresponding to two sets of driving modules 20. The two sets of driving modules 20 use the lever principle to drive the turntable 14 to rotate in opposite directions to control the size of the aperture 150. For details, please refer to Figure 4 The first driving module 20A corresponds to the first track 143 of the rotating disk 14, and the second driving module 20B corresponds to the second track 142 of the rotating disk 14. The first driving module 20A and the second driving module 20B are used to drive the rotating disk 14 to rotate in opposite directions respectively, so as to drive the blades 15 to move accordingly. For example, the first driving module 20A drives the rotating disk 14 to rotate in opposite directions. Figure 4 The blade 15 moves toward the center and the aperture 150 becomes smaller. The second driving module 20B drives the turntable 14 to rotate counterclockwise. Figure 4 As the viewing angle rotates clockwise, the blade 15 moves centrifugally correspondingly and enlarges the aperture 150. It should be noted that the first track 143 and the second track 142 of the turntable 14 can be but are not limited to two adjacent inner and outer ring tracks (such as Figure 4 As shown), or two tracks located at different positions on the bottom surface of the turntable 14, which are pushed to rotate in opposite directions.

[0093] See also Figure 2 Each set of driving modules 20 has an active component 23 and a passive component 21, and both the active component 23 and the passive component 21 are disposed on the base 12. Figure 8 The follower 21 has a stress bearing portion 210 fixed to the base 12. When the active member 23 is controlled to apply a thrust F1 to the follower 21, the stress bearing portion 210 generates a restoring force F2 accordingly. The thrust F1 and the restoring force F2 cooperate to drive the follower 21 to contact the first track 143 or the second track 142 of the turntable 14. In this way, the variable aperture assembly 10 generates a pulling force using the lever principle. The generated pulling force can be suitable for pulling more blades 15, and the pulling force can also be converted into a longer stroke to meet the requirements of the electronic device in the camera structure design. In addition, the variable aperture assembly 10 has a simple structure and is easy to manufacture.

[0094] Furthermore, the structure of components in the variable aperture assembly 10 is described below.

[0095] See also Figure 5 , Figure 6 and Figure 7 , Figure 5 is a schematic three-dimensional view of a turntable 14 according to some embodiments; Figure 6 yes Figure 5 An enlarged schematic diagram indicating the location of area B; Figure 7 yes Figure 2 A schematic cross-sectional view showing the position 7-7, and a partial enlarged schematic view showing the position marked by a dot chain line.

[0096] See also Figure 3 In some embodiments, the cover plate 16 is located on one side of the base 12. In the following embodiments, the side where the cover plate 16 is located is referred to as the "top" or "upper", and the other opposite side is referred to as the "bottom" or "lower". The turntable 14 is located on the outer surface of the base 12. The top surface of the base 12 has a plurality of short shafts 122. The top surface of the turntable 14 also has a plurality of positioning posts 141. One positioning post 141 and one short shaft 122 correspond to one blade 15. Specifically, one end of each blade 15 has a positioning hole 151 and an axis hole 152. Compared with the axis hole 152, the positioning hole 151 is closer to the outer edge of the blade 15. The positioning post 141 of the turntable 14 is located in the positioning hole 151, and the short shaft 122 of the base 12 is located in the axis hole 152. In this way, each blade 15 moves centrifugally or centrifugally with the short shaft 122 as the axis to control the size of the aperture hole 150.

[0097] See also Figure 3 and Figure 7 In some embodiments, the turntable clamping portion 124 of the base 12 protrudes from the outer surface of the base 12. The turntable clamping portion 124 can be annularly arranged on the outer surface of the base 12, or can be multiple and evenly arranged on the outer surface of the base 12. The inner side of the turntable 14 has two sets of inclined surface structures. For details, please refer to Figure 5 The first group of inclined surface structures has a sliding surface 145 connected to the bottom surface of the rotating disk 14, and the second group of inclined surface structures has a stopping surface 146, and the stopping surface 146 is located above the sliding surface 145. Figure 7 The sliding surface 145 is located in the groove 120 of the turntable clamping portion 124, and the stop surface 146 contacts the outer surface of the base 12. In addition, the inclination angle of the sliding surface 145 is smaller than the inclination angle of the stop surface 146, and the inclination angle is Figure 7 When the turntable 14 is mounted on the base 12 from top to bottom, the first set of inclined surface structures with the sliding surface 145 is convenient for assembly. The stop surface 146 can be used to position the turntable 14 and guide the turntable 14 to rotate.

[0098] See also Figure 3 and Figure 4 In some embodiments, the first drive module 20A has a controller 25A, an active member 23A and a driven member 21A. Similarly, the second drive module 20B has a controller 25B, an active member 23B and a driven member 21B. The controllers 25A and 25B can be, but are not limited to, smooth impact drive mechanism (SIDM) actuators, or other linear actuators. The configuration and actuation of the first drive module 20A and the second drive module 20B are the same, and the second drive module 20B is taken as an example for explanation below. The controller 25B is connected to the active member 23B, and the controller 25B is used to alternately energize and de-energize the active member 23B to control the active member 23B to generate a thrust F1 (see Figure 8 For details, please refer to Figure 8 When the controller 25B energizes the active member 23B, the active member 23A deforms accordingly and generates a thrust F1. The driven member 21B contacts the turntable 14 due to the thrust F1 and generates a restoring force F2 accordingly. When the controller 25B de-energizes the active member 23B, the restoring force F2 drives the driven member 21B away from the turntable 14.

[0099] Next, the specific structures of the rotating disk 14, the driven member 21 and the driving member 23 are introduced.

[0100] See also Figure 5 , the first track 143 and the second track 142 are located on the bottom surface of the turntable 14. Figure 4 , the inner diameter R1 of the first track 143 is smaller than the inner diameter R2 of the second track 142, and the first track 143 and the second track 142 are two adjacent circular tracks. It should be noted that the first track 143 and the second track 142 can also be two arc tracks respectively located at different parts of the turntable 14, and the inner diameter R1 of the first track 143 and the inner diameter R2 of the second track 142 are also equal to or different.

[0101] See also Figure 6 In some embodiments, the first track 143 and the second track 142 are both toothed ratchet tracks, and the first track 143 and the second track 142 are involute tooth profiles, and the tooth profiles of the first track 143 and the second track 142 are positive and negative involutes, respectively. Accordingly, when the turntable 14 rotates, each tooth surface contact point can maintain a constant speed, thereby reducing the wear and noise of the tooth surface, thereby improving the efficiency and service life of the variable aperture assembly 10. The tooth profiles of the first track 143 and the second track 142 include but are not limited to straight teeth, helical teeth, serrated teeth, or teeth that can be pushed in both directions.

[0102] Next, see Fig.9A , Fig. 9B , Fig. 9C and Fig.10 , Fig.9A is a three-dimensional schematic diagram of a driven member 21B of a second driving module 20B according to some embodiments; Fig. 9B is a schematic top view of a follower 21B of a second driving module 20B according to some embodiments; Fig. 9C is a schematic top view of a follower 21A of a first driving module 20A according to some embodiments; Fig.10 yes Figure 8 The enlarged schematic diagram indicating the position of area C shows a portion of the second track 142 in gray, a solid gray block indicates that the resistance portion 211 is located at the starting position P1, and a dotted white block indicates that the resistance portion 211 is located at the contact position P2.

[0103] In some embodiments, the followers 21A and 21B each have a force-bearing portion 212, a force-resisting portion 211, and a stress-bearing portion 210, wherein the force-resisting portion 211 connects the force-bearing portion 212 and the stress-bearing portion 210, and the stress-bearing portion 210 has a curved section 214 and a fixed section 216, one end of the curved section 214 is extendedly connected to the force-resisting portion 211, and the other end is connected to the fixed section 216, and the fixed section 216 is fixed to the base 12 by a fastener (such as a tenon or a screw), and the curved section 214 may be, but is not limited to, an S-shape, a C-shape, or a ">" shape. In some embodiments, an angle α is provided between the force-bearing portion 212 and the force-resisting portion 211. Preferably, the angle α is at least 90 degrees and less than 180 degrees. In addition, the force-resisting portion 211 is a portion parallel to the bottom surface of the turntable 14 (see Figure 8 ), the contact section 213 of the resistance portion 211 is the portion where the resistance portion 211 contacts the corresponding track. For example, please refer to Figure 4 , the follower 21A and the follower 21B correspond to the first track 143 and the second track 142 respectively, and the contact section 213 of the follower 21A is located at Fig. 9C The inner edge 219 of the resistance portion 211 is shown, and the contact section 213 of the follower 21B is located at Fig. 9B The outer edge 218 of the resistance portion 211 is shown.

[0104] Next, the actuation relationship between the follower 21 and the corresponding track is described. Take the second driving module 20B as an example. Fig.10 When the follower 21B is not subjected to force, the resistance portion 211 is located at the initial position P1, and there is a gap S between the resistance portion 211 and the rotating disk 14. Figure 8 When the active member 23B applies a thrust F1 to the force-bearing portion 212, the force-resisting portion 211 is moved to the contact position P2 (see Fig.10) and contacts the corresponding track, thereby pushing the turntable 14 to rotate. At this time, the curved section 214 generates a restoring force F2. When the thrust F1 disappears or the restoring force F2 is greater than the thrust F1, the resistance portion 211 moves from the contact position P2 toward the starting position P1 and away from the turntable 14. In this way, one stroke is completed.

[0105] The following describes embodiments of other variations and applications.

[0106] In some embodiments, see Figure 6 The first track 143 and the second track 142 have straight tooth types, each tooth has an inclined surface 147 and a stop surface 148 and is in a right triangle shape, and the inclined surface 147 of the first track 143 is inclined in the opposite direction to the inclined surface 147 of the second track 142. For example, the inclined surface 147 of the first track 143 is oriented in the direction of Figure 6 In the upper left corner of the viewing angle, the inclined surface 147 of the second track 142 faces the Figure 6 The inclination directions of the two are opposite. If the tooth profile direction of the first track 143 is forward, the tooth profile direction of the second track 142 is reverse. In this way, the first track 143 or the second track 142 can be pushed unidirectionally by the corresponding follower 21 to avoid slippage between the follower 21 and the corresponding track. Figure 4 and Figure 6 Taking the follower 21A of the first driving module 20A as an example, when the follower 21A contacts the inclined surface 147 of each tooth, the follower 21A slides from one end of the inclined surface 147 to the other end, and then drives the turntable 14 to rotate in a single direction by pushing the stop surface 148 of each tooth. That is, when the stop surface 148 of the first track 143 is pushed, the turntable 14 rotates in a single direction. Figure 4 If the viewing angle is rotated clockwise, the blade 15 moves centrifugally.

[0107] See also Figure 6 and Figure 8 In some embodiments, the moving direction D2 of the resistance portion 211 from the starting position P1 to the contact position P2 is substantially parallel to the inclined surface 147 of the tooth shape of the rotating disk 14. For example, Figure 8 The moving direction D2 shown is parallel to Figure 6 The inclined surface 147 of the second track 142 is shown.

[0108] In some embodiments, see Fig.11 , Fig.11FIG. 1 is a partial enlarged schematic diagram of the turntable 14 and the follower 21 according to some embodiments, showing that the follower 21 is located at the starting position P1. In some embodiments, the turntable 14 may also be a friction wheel without any teeth, that is, in this embodiment, the first track 143 and the second track 142 may be a first friction track and a second friction track respectively, and the two friction tracks may be, for example but not limited to, tracks with a concave-convex structure without any teeth or a non-smooth friction surface. The structures of the followers 21A and 21B in this embodiment are similar to 9A to 9C The structure shown is different in that the contact section 213 is a concave-convex structure without any tooth shape or a non-smooth friction surface. The operation between the driven members 21A, 21B and the corresponding tracks is similar to the above-mentioned embodiment, except that the turntable 14 is rotated by the friction between the contact section 213 and the corresponding track. Therefore, since the friction force is used to drive the turntable 14 to rotate, the magnitude of the friction force can be determined by the material and positive pressure of the driven member 21 and is not limited by the number of teeth, which is convenient in design.

[0109] See also Figure 8 In some embodiments, the first driving module 20A and the second driving module 20B adopt a shape memory alloy (SMA) driving method. Taking the second driving module 20B as an example, the active member 23B has a shape memory alloy wire 231 and a fixed block 233. The fixed block 233 is arranged on the outer surface of the base 12. One end of the shape memory alloy wire 231 is connected to the fixed block 233, and the other end is obliquely connected to the force-bearing part 212 of the driven member 21B. The shape memory alloy wire 231 and the force-bearing part 212 are roughly V-shaped. Preferably, the inclination angle θ of the shape memory alloy wire 231 is less than or equal to 45 degrees. In addition, the shape memory alloy wire 231 applies a thrust F1 to the force-bearing part 212, and the thrust direction of the thrust F1 is substantially parallel to the moving direction D2 of the resistance part 211 from the starting position P1 to the contact position P2. To illustrate with the lever principle, the stress bearing portion 210 is the fulcrum of the lever, and the thrust F1 acts on the force bearing portion 212, and the direction of the thrust F1 is not parallel to the force resisting portion 211. Therefore, the thrust F1 and the fulcrum are respectively located at the two ends of the follower 21B, which is a force-saving lever structure, and through this lever action, the pulling force of the blade 15 can be amplified. For example, please refer to Figure 4 and Figure 8, the controllers 25A and 25B can control the shape memory alloy wire 231 to produce telescopic deformation, and the telescopic rate of the shape memory alloy wire 231 is between 2% and 10%. When the telescopic rate of the shape memory alloy wire 231 is 2% and the length is 2 mm, although the length telescopic change of the shape memory alloy wire 231 is only 0.04 mm, through the aforementioned lever principle, the shape memory alloy wire 231 is sufficient to make a movement of the turntable 14 reach 0.2 mm. In addition, in some embodiments, the active member 23B can also have a sliding block 235, the sliding block 235 is located between the fixed block 233 and the force-bearing portion 212, and the shape memory alloy wire 231 is located in the groove of the sliding block 235. When the shape memory alloy wire 231 contracts, the sliding block 235 will also move.

[0110] In this way, the lever action of the shape memory alloy wire 231 and the follower 21 can amplify the pulling force acting on the blade 15 by more than 10 times. Therefore, the variable aperture assembly 10 can be applied to lens modules with more functional designs.

[0111] Also, see Fig.12 , Fig.12 1 is a partially enlarged schematic diagram of the turntable 14, the active member 23 and the driven member 21 according to some embodiments. In some embodiments, the first driving module 20A and the second driving module 20B are driven by piezoelectric ceramic materials. Taking the second driving module 20B as an example, the active member 23B has a metal wire 234 and a piezoelectric ceramic driving member 232. One end of the metal wire 234 is fixed to the base 12, and the other end is a free end. The free end is connected to the piezoelectric ceramic driving member 232. The piezoelectric ceramic driving member 232 is adjacent to the force-bearing portion 212, and the piezoelectric ceramic driving member 232 is substantially parallel to the force-bearing portion 212. When the controller 25B (see Figure 4 ) When the metal wire 234 is not energized, the piezoelectric ceramic driving component 232 and the force-bearing portion 212 may be in contact or have a gap therebetween. When energized, the piezoelectric ceramic driving component 232 is deformed, the piezoelectric ceramic driving component 232 contacts the force-bearing portion 212 and applies a thrust F1 to the force-bearing portion 212. The thrust direction of the thrust F1 is not parallel to the moving direction D2 of the resistance portion 211 from the starting position P1 to the contact position P2, which means that the thrust direction of the thrust F1 and the moving direction D2 form an acute angle. The lever principle of this embodiment is the same as the aforementioned embodiment and will not be described in detail. It is worth noting that this embodiment uses a piezoelectric ceramic driving component 232, which has the advantages of small size, simple structure, no appearance restrictions, high power density, non-flammability, and no electromagnetic interference. In addition, the piezoelectric ceramic driving component 232 does not require coil winding, so it will not cause electromagnetic interference, leakage inductance, low-frequency noise, and other problems, and is lightweight, practical and safe.

[0112] See also Figure 2 , Figure 3 and Fig.13, Fig.13 FIG. 1 is a partial enlarged schematic diagram of the magnetic ring 11, the rotating disk 14 and the Hall sensor 41 according to some embodiments, wherein the rotating disk 14 is indicated by a dotted line. In some embodiments, the variable aperture assembly 10 further comprises a magnetic ring 11 and a Hall sensor 41, wherein the magnetic ring 11 is located on the top surface of the rotating disk 14, and the Hall sensor 41 is located on the sensor fixing portion 121 of the base 12 (see FIG. Figure 3 ), the Hall sensor 41 is used to sense the rotation position change of the turntable 14. Fig.13 The magnetic ring 11 has a plurality of magnetic blocks 110, and the width w2 of each magnetic block 110 corresponds to a stroke of the rotating disk 14. In addition, the polarities of two adjacent magnetic blocks 110 are opposite. Fig.13 For example, if the magnetic block 110b is an S pole, the magnetic blocks 110a and 110c adjacent to the magnetic block 110b are N poles. Since the Hall sensor 41 is located outside the magnetic field of the magnetic ring 11, the magnetic field of the magnetic ring 11 will affect the movement of the electrons in the Hall sensor 41, thereby generating a potential difference in the Hall sensor 41. This potential difference can be converted into a voltage signal or a current signal for the control unit (such as a circuit board) to read or process. For example, when the turntable 14 is pushed and rotates a stroke, the magnetic ring 11 is also driven to rotate a stroke, and the voltage signal or current signal generated by the Hall sensor 41 accordingly senses the change in the rotation position of the turntable 14 and detects the accuracy of the stroke of the turntable 14.

[0113] See also Figure 6 and Fig.13 In some embodiments, the width w2 of each magnetic block 110 corresponds to the interval w1 of each tooth on the turntable 14 (see Figure 6 For example, if the blade 15 is designed to be fully opened at an angle of 45 degrees, the tooth profiles of the first track 143 and the second track 142 are as follows: Figure 6 For the straight tooth type shown, the interval between each tooth on the turntable 14 can be designed to be 1.8 degrees, and the total number of teeth of the first track 143 and the second track 142 is 200 teeth, so 25 strokes are required to fully open the blade 15. Correspondingly, the width w2 of each magnetic block 110 is also 1.8 degrees to correspond to the movement of each stroke of the turntable 14.

[0114] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims of the present invention.

Claims

1. A variable aperture assembly, characterized in that: Include: Pedestal; A plurality of blades are annularly arranged on the base; A turntable, located between the base and the blades, the blades are connected to the turntable, and the turntable has a first track and a second track; A first driving module corresponding to one of the first track and the second track; and A second driving module, corresponding to the other of the first track and the second track, wherein the first driving module and the second driving module are used to drive the turntable to rotate in opposite directions respectively by leveraging, so as to drive the blades to move correspondingly, and the first driving module and the second driving module each include: an active member, disposed on the base; and A follower is arranged on the base, and the follower includes a stress-bearing part fixed to the base. When the active member is controlled to apply a thrust to the follower, the stress-bearing part generates a restoring force accordingly. The thrust and the restoring force cooperate to drive the follower to contact one of the first track and the second track.

2. The variable aperture assembly according to claim 1, characterized in that: The follower further comprises: a force-bearing portion, the active member applying the thrust to the force-bearing portion; and A resistance part connects the force-bearing part and the stress-bearing part, the resistance part is parallel to the turntable, the stress-bearing part has a curved section, the curved section generates the restoring force, wherein the thrust and the restoring force cooperatively drive the resistance part to have a starting position and a contact position, when the resistance part is at the contact position, the resistance part contacts one of the first track and the second track; when the resistance part is at the starting position, there is a gap between the resistance part and the turntable.

3. The variable aperture assembly according to claim 2, characterized in that: One end of the bending section is extendedly connected to the resistance part, and the other end is fixed to the base.

4. The variable aperture assembly according to claim 2, characterized in that: The active parts include: a metal wire fixed to the base; and A piezoelectric ceramic driving component is connected to the free end of the metal wire, and the piezoelectric ceramic driving component is substantially parallel to the force-bearing part.

5. The variable aperture assembly according to claim 4, characterized in that: The piezoelectric ceramic driving component applies the thrust to the force-bearing portion, and a thrust direction of the thrust forms an acute angle with a moving direction of the force-resisting portion from the starting position toward the contact position.

6. The variable aperture assembly according to claim 2, characterized in that: The active parts include: A shape memory alloy wire is obliquely connected to the force-bearing part of the follower, and the shape memory alloy wire applies the thrust to the force-bearing part, and the thrust direction of the thrust is substantially parallel to the moving direction of the resistance part from the starting position to the contact position.

7. The variable aperture assembly according to claim 6, characterized in that: An inclined surface of the tooth profile of one of the first track and the second track is substantially parallel to the shape memory alloy wire.

8. The variable aperture assembly according to claim 1, characterized in that: The first track and the second track of the turntable are respectively a first toothed ratchet track and a second toothed ratchet track, the first toothed ratchet track corresponds to the first driving module, and the second toothed ratchet track corresponds to the second driving module, wherein the tooth directions of the first toothed ratchet track and the second toothed ratchet track are opposite, and the inner diameter of the first toothed ratchet track is smaller than the inner diameter of the second toothed ratchet track.

9. The variable aperture assembly according to claim 8, characterized in that: The teeth of the first toothed ratchet track and the second toothed ratchet track are both straight teeth.

10. The variable aperture assembly according to claim 1, characterized in that: The first track and the second track of the turntable are respectively a first friction track and a second friction track, and an inner diameter of the first friction track is smaller than an inner diameter of the second friction track.

11. The variable aperture assembly according to claim 1, characterized in that: Also includes: A magnetic ring, located on the turntable, the magnetic ring having a plurality of magnetic blocks, the polarity directions of two adjacent magnetic blocks are opposite, and the width of each magnetic block corresponds to a stroke of the turntable; as well as The Hall sensor is located on the base and is used to sense the rotation position change of the turntable.

12. The variable aperture assembly according to claim 1, characterized in that: The inner side of the turntable has a stop surface and a sliding surface, the inclination angle of the sliding surface is smaller than the inclination angle of the stop surface, and the stop surface contacts the outer surface of the base.

13. The variable aperture assembly according to claim 1, characterized in that: The first driving module and the second driving module each further include a controller connected to the active component, and the controller is used to alternately power on and off the active component to control the active component to generate the thrust.

14. A lens module, characterized in that: Include: Lens; as well as The variable aperture assembly of claim 1 is disposed on the lens, and is used to control the amount of light entering the lens.

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