Two-stage variable aperture imaging driving device

Abstract

The utility model discloses a two-gear type variable aperture camera shooting driving device, which comprises a base, a rotating carrier, a blade group, a circuit board and a driving assembly, and is characterized in that the base is of a hollow structure and is used for accommodating other parts of the driving device; the rotary carrier is movably arranged in the base and can rotate relative to the base; two ends of the blade group are fixedly connected with the base and the rotary carrier respectively; the circuit board is fixedly connected with the base; the driving assembly comprises a driving magnet, a driving coil and a magnetic attraction piece, the driving magnet is fixedly connected with the rotating carrier, the driving coil is electrically connected with the circuit board, and the magnetic attraction piece is fixedly connected with the circuit board; wherein the driving magnets are divided into two groups, the two groups of driving magnets are mutually and reversely magnetized, and at the same time, only one group of driving magnets and the magnetic attraction piece generate magnetic attraction force. The driving device can solve the problems that in a VA scheme in the prior art, the precision of a round hole is poor, the requirement for control precision is high, the assembling process is complex, and cost is high.

Description

Technical Field

[0001] This utility model belongs to the field of optical element driving technology, and in particular relates to a two-stage variable aperture camera driving device. Background Technology

[0002] With the development of electronic technology, users have increasingly higher requirements for the photography and video recording functions of electronic devices, such as smartphones or digital cameras. The demand for miniature camera modules is also constantly increasing, and more and more manufacturers are pursuing the inclusion of variable apertures in mobile phone camera modules. By changing the size of the aperture opening of the variable aperture, the intensity of incident light can be adjusted, thereby significantly improving the image quality of the camera module. In bright light, the camera can obtain a deeper depth of field and a sharper image by narrowing the aperture; in low light, increasing the aperture increases the amount of light entering the camera, resulting in a cleaner image with higher exposure and lower noise.

[0003] However, existing two-speed VA solutions mostly use two sets of blades, which have poor precision in the circular holes and require a large rotation angle. In addition, existing solutions mostly use magnets and coils to drive the mover to the required speed through electromagnetic force, which requires high control precision and has a complex assembly process and high cost, thus failing to meet the low-cost needs of some mobile phone users. Utility Model Content

[0004] The purpose of this invention is to provide a two-stage variable aperture camera drive device to solve the problems of poor circular aperture accuracy in the existing VA solution; and the high control precision requirements, complex assembly process, and high cost associated with using a magnet and coil drive to drive the mover to the required position via electromagnetic force.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A two-stage variable aperture camera drive includes:

[0007] The base is a hollow structure used to accommodate other components of the drive device;

[0008] A rotating carrier is movably disposed within the base, and the rotating carrier can rotate relative to the base;

[0009] A blade assembly, wherein both ends of the blade assembly are fixedly connected to the base and the rotating carrier, respectively.

[0010] A circuit board, which is fixedly connected to the base;

[0011] A driving assembly, comprising driving magnets, driving coils and magnetic suction pieces, the driving magnets are fixedly connected with the rotating carrier, the driving coils are electrically connected with the circuit board, and the magnetic suction pieces are fixedly connected with the circuit board; wherein the driving magnets are two groups, and the two groups of driving magnets are oppositely magnetized, and only one group of driving magnets generates magnetic attraction with the magnetic suction pieces at the same time.

[0012] Preferably, the magnetic suction piece is a hollow quadrilateral magnetic suction piece.

[0013] Preferably, the magnetic suction piece is two pieces, respectively placed at both ends of the circuit board.

[0014] Preferably, it further comprises a limiting structure, which is a guide, located between the rotating carrier and the base, and the guide is a ball or a guide shaft.

[0015] Preferably, the limiting structure is a mover limiting surface, which adopts friction limiting between the rotating carrier and the base plastic parts.

[0016] Preferably, the magnetic attraction makes the rotating carrier tightly suck at the base limiting position.

[0017] Preferably, the driving coil is correspondingly arranged with the driving magnet.

[0018] Preferably, the driving device further comprises a light shield, which is arranged between the blade group and the rotating carrier, and is fixedly connected with the rotating carrier.

[0019] Preferably, a first fixed groove is arranged on the blade group, a first fixed column is arranged on the base, the first fixed groove and the first fixed column cooperate to fix the blade group and the base; a second fixed column is arranged on the rotating carrier, and a sliding groove matched with the second fixed column is arranged on the blade group, which is used for rotating control of the size of the aperture.

[0020] Preferably, the driving device further comprises a top cover, which comprises a metal reinforcing part, which is downwardly bent and buckled with the base to form an accommodating space.

[0021] Compared with the prior art, the two-gear variable aperture camera driving device provided by the utility model has the following advantages: the driving assembly is composed of two groups of driving magnets, the two gears of the mover are respectively attracted to the magnetic attraction piece by one group of driving magnets, the physical structure limiting is added to achieve the limiting effect, the limiting mode is the magnetic attraction force generated by the driving magnets and the magnetic attraction piece, only the electromagnetic force is needed to drive when the gears are switched, and high control precision is not needed; moreover, the driving magnets are single-pole square magnets, which are simple to process, simple to assemble and low in cost; in addition, the technical scheme adopts multiple groups of blades, so that the circular hole precision is higher. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the explosion view of the driving device of the utility model;

[0023] Figure 2 It is the position relation structure schematic view of the driving assembly and the circuit board of the driving device of the utility model;

[0024] Figure 3 It is the overall structure schematic view of the driving device of the utility model without the top cover;

[0025] Figure 4 It is the overall structure schematic view of the driving device of the utility model.

[0026] In the drawing, 1, top cover, 2, blade group, 3, light shielding piece, 4, rotating carrier, 5, driving assembly, 6, base, 7, driving magnet, 8, driving coil, 9, circuit board, 10, magnetic attraction piece, 11, first fixed groove, 12, sliding groove, 13, first fixed column, 14, second fixed column. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings, and obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0028] Referring to Figures 1-4 The two-gear variable aperture camera driving device is further described.

[0029] Figure 1 An embodiment of the two-gear variable aperture camera driving device of the utility model is shown, as Figure 1As shown, the driving device comprises a top cover 1, a base 6, a rotating carrier 4, a driving assembly 5 and a circuit board 9, the top cover 1 is fixedly connected with the base 6, the base 6 is fixedly connected with the circuit board 9, and the circuit board 9 is electrically connected with the driving assembly 5. As preferred, the top cover 1 is fixedly connected with the base 6 in a snap-fastening manner; the base 6 is of a hollow structure, and the top cover 1 comprises a metal reinforcing piece which is bent downward and interlocked with the base 6 to form an accommodating space in the base 6 for accommodating other structural components of the driving device.

[0030] As shown in the exploded view of the components and the overall structural view, Figure 1 Figure 4 It can be seen from the overall structural view that most of the components of the driving device are mounted on the rotating carrier 4 and the base 6, and the top cover 1 is only used as an auxiliary component. Figure 3 Figure 4 It can be seen from the exploded view of the components and the overall structural view that the rotating carrier 4 is movably arranged in the base 6 and placed in the accommodating space, and the rotating carrier 4 can rotate relative to the base 6. One end of the blade set 2 is fixedly connected with the base 6, and the other end is fixedly connected with the rotating carrier 4. Figure 1 Figure 3 As shown, the blade set 2 is provided with a plurality of first fixing grooves 11, the base 6 is provided with a plurality of first fixing columns 13 which are equal in number to the first fixing grooves 11 and matched with the first fixing grooves 11, the first fixing grooves 11 and the first fixing columns 13 are matched to fix the blade set 2 with the base 6; the rotating carrier 4 is provided with a plurality of second fixing columns 14 on one side close to the top cover 1, and the blade set 2 is provided with a plurality of sliding grooves 12 which are equal in number to the second fixing columns 14 and correspond in position to the second fixing columns 14, the second fixing columns 14 and the sliding grooves 12 are matched to control the size of the aperture by rotating the blade set 2.

[0031] Specifically, the blade set 2 is composed of a plurality of blades, and the plurality of blades are alternately and superposed to form a ring. As preferred, the blade set 2 is composed of six blades, and the corresponding first fixing grooves 11, first fixing columns 13, second fixing columns 14 and sliding grooves 12 are all provided in six. The second fixing columns 14 on the rotating carrier 4 can pass through the sliding grooves 12, and the sliding grooves 12 and the second fixing columns 14 jointly act to rotate the blade set 2 with the rotating carrier 4. When the rotating carrier 4 rotates within a fixed stroke under the action of the limiting structure, the blade set 2 can be rotated to control the size of the aperture.

[0032] As shown in the exploded view of the components and the overall structural view, Figure 1 The driving device further comprises a light-shielding piece 3 which is arranged between the blade set 2 and the rotating carrier 4 and is fixedly connected with the rotating carrier 4.

[0033] As shown in the exploded view of the components and the overall structural view, Figures 1 to 3 ​​​As shown in the drawings, the driving assembly 5 comprises, from inside to outside, driving magnets 7, a driving coil 8 and a magnetic attraction piece 10 in sequence.

[0034] The driving coil 8 is arranged correspondingly to the driving magnets 7, and is fixedly connected to the inner side of the circuit board 9, specifically, the driving coil 8 is electrically connected to the circuit board 9, and the outer side of the circuit board 9 is fixedly connected with the magnetic attraction piece 10, as shown in the drawings. Figure 2 As shown in the drawings, the magnetic attraction piece 10 is a hollow quadrilateral magnetic attraction piece, and the centers of the driving coil 8, the circuit board 9 and the magnetic attraction piece 10 are on a same central axis.

[0035] At the same time, only one group of driving magnets 7 and the magnetic attraction piece 10 attract each other to provide a magnetic attraction force, which makes the rotating carrier 4 tightly suck on one side of the base 6, and makes the rotating carrier 4 tightly suck on the limiting position on one side of the base 6. When the driving coil 8 is energized, a driving force is provided for the rotating carrier 4, the electromagnetic driving force is controlled in a non-full stroke section, and the electromagnetic force only needs to rotate the rotating carrier 4 to more than half of the total stroke, and the subsequent control will be mainly controlled by the magnetic attraction force, the magnetic attraction driving force makes the rotating carrier 4 continue to rotate, and the single attraction of one group of driving magnets 7 and the magnetic attraction piece 10 changes to the single attraction of another group of driving magnets 7 and the magnetic attraction piece 10, so as to drive the rotating carrier 4 to reach the other limiting position on the base 6.

[0036] Preferably, the driving coil 8 is made of a hollow coil structure or an injection molding piece winding mode.

[0037] Preferably, the driving device further comprises a limiting structure, which is a guide piece (not shown in the drawings), arranged between the rotating carrier 4 and the base 6, for guiding and limiting the rotation of the rotating carrier 4, and as an option, the guide piece can be a ball bearing or a guide shaft.

[0038] Preferably, the limiting structure is a rotor limiting surface, which directly rubs and limits the rotating carrier 4 and the base 6, as shown in the drawings. Figure 1 and Figure 3 The limiting structure is a friction limiting structure between plastic pieces.

[0039] Preferably, the magnetic attraction piece 10 can be two pieces, respectively arranged at both ends of the circuit board 9. Preferably, the top cover 1 is an integral structure, which can enhance the strength of the top cover 1.

[0040] The working principle of the utility model is as follows:

[0041] In the initial stage, only one set of driving magnets 7 and the magnetic attraction piece 10 are attracted to each other to provide a magnetic attraction force, which makes the rotating carrier 4 tightly suck on one side of the base 6, and makes the rotating carrier 4 tightly suck on the limiting position of the base 6; when the circuit board 9 is connected to external electrical signals, the electrical signals are transmitted to the driving coil 8, the driving coil 8 and the magnetic field generated by the driving magnet 7 interact to form a Lorentz force, which provides a driving force for the rotating carrier 4, the driving force makes the rotating carrier 4 rotate, and the single attraction of one set of driving magnets 7 and the magnetic attraction piece 10 changes to the single attraction of another set of driving magnets 7 and the magnetic attraction piece 10, so that the rotating carrier 4 reaches the other limiting position of the base 6, thereby driving the two-stage opening and closing of the blade group 2, and completing the control of the size of the aperture.

[0042] The utility model discloses drive structure is simple, and the process is simple, is fit for universal industrialization popularization.

[0043] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above, and the skilled in the art should understand that the utility model is not limited by the above examples, and the above examples and the description in the specification are only to illustrate the principle of the utility model, and various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A two-stage variable aperture image pickup driving device characterized by comprising: The utility model relates to a kind of rotating control light ring, including: Base (6), the base (6) is hollow structure, for accommodating the other components of driving device; Rotary carrier (4), the rotary carrier (4) is movably arranged in the base (6), the rotary carrier (4) can be rotated relative to the base (6) motion; Blade group (2), the blade group (2) is fixedly connected with the base (6) and the rotary carrier (4) respectively at both ends; Circuit board (9), the circuit board (9) is fixedly connected with the base (6); Driving assembly (5), the driving assembly (5) includes drive magnet (7), drive coil (8) and magnetic attraction piece (10), the drive magnet (7) is fixedly connected with the rotary carrier (4), the drive coil (8) is electrically connected with the circuit board (9), the magnetic attraction piece (10) is fixedly connected with the circuit board (9);Wherein, the drive magnet (7) is two groups, and the two groups of drive magnet (7) are mutually reverse magnetization, at the same time, only one group of drive magnet (7) generates magnetic attraction force with the magnetic attraction piece (10).

2. The two-step iris video driving apparatus according to claim 1, wherein The magnetic attraction piece (10) is a hollow quadrilateral magnetic attraction piece.

3. The two-step iris video driving apparatus according to claim 1, wherein The magnetic attraction piece (10) is two, and is placed in the circuit board (9) both ends respectively.

4. The two-step iris camera driving apparatus according to claim 1, wherein Still including limiting structure, the limiting structure is guide element, the guide element is located between the rotary carrier (4) and the base (6), and the guide element is ball or guide shaft.

5. The two-step iris video driving apparatus according to claim 4, wherein The limiting structure is mover limiting surface, and friction limiting is adopted between the rotary carrier (4) and the base (6) plastic parts.

6. The two-step iris camera driving apparatus according to claim 1, wherein The magnetic attraction force makes the rotary carrier (4) suction tightly in the base (6) limiting place.

7. The two-step iris video driving apparatus according to claim 1, wherein The drive coil (8) is correspondingly arranged with the drive magnet (7).

8. The two-step iris video driving apparatus according to claim 1, wherein Still including light shield (3), the light shield (3) is arranged between the blade group (2) and the rotary carrier (4), and is fixedly connected with the rotary carrier (4).

9. The two-step iris video driving apparatus according to claim 1, wherein First fixed groove (11) is arranged on the blade group (2), first fixed column (13) is arranged on the base (6), the first fixed groove (11) is matched with the first fixed column (13), and the blade group (2) is fixed with the base (6);Second fixed column (14) is arranged on the rotary carrier (4), and sliding groove (12) matched with the second fixed column (14) is arranged on the blade group (2), for rotating control aperture size of the blade group (2).

10. The two-step iris video driving apparatus according to claim 1, wherein Still including top cover (1), the top cover (1) includes metal reinforcing part, the metal reinforcing part is downwardly bent, and is buckled with the base (6) and is arranged, to form accommodating space.

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