Variable aperture mechanism driven by piezoelectricity

Abstract

The utility model discloses a variable aperture mechanism driven by piezoelectricity. The variable aperture mechanism comprises an aperture enclosed by a plurality of blades arranged along the circumference; the blades can rotate along with the rotating support, so that when the piezoelectric driving mechanism drives the rotating support to rotate in the circumferential direction, the rotating support drives the blades to get close to the center so as to reduce the area of the aperture, or the rotating support drives the blades to diffuse to the periphery so as to enlarge the area of the aperture. The stepless adjusting device is small in size, compact and simple in structure, capable of achieving stepless adjustment and high in adjusting precision.

Description

Technical Field

[0001] The utility model relates to a variable aperture mechanism, in particular to a variable aperture mechanism driven by piezoelectricity. Background Art

[0002] The variable aperture technology is relatively mature in the field of cameras. Generally, the aperture adjustment methods are manual adjustment or automatic adjustment driven by a motor. It has relatively high requirements for space, and the motor drive cannot achieve stepless adjustment. The size of the aperture can only be a few fixed values. In addition, the existing variable apertures also have the defects of large volume and inability to be miniaturized. Summary of the Utility Model

[0003] In view of this, the utility model provides a variable aperture mechanism driven by piezoelectricity, which has a small volume, a simple structure, and can realize stepless scaling of the aperture.

[0004] To solve the above technical problems, the technical solution of the utility model is to adopt a variable aperture mechanism driven by piezoelectricity, including an aperture surrounded by a plurality of blades arranged in a circle; the blades can rotate with a rotating bracket, so that when the piezoelectric drive mechanism drives the rotating bracket to rotate circumferentially, the rotating bracket drives the blades to move closer to the center to reduce the area of the aperture, or the rotating bracket drives the blades to spread outwards to increase the area of the aperture.

[0005] As an improvement, it further includes a base, and the rotating bracket and the base can rotate relative to each other; rotation holes and moving holes are opened on the blades; the rotation holes are sleeved on positioning columns arranged on the base, so that the blades can rotate along the positioning columns; the moving holes are sleeved on positioning pins arranged on the rotating bracket, so that the blades can be driven to rotate when the rotating bracket rotates.

[0006] As a further improvement, a plurality of balls are arranged between the base and the rotating bracket.

[0007] As another further improvement, a raceway for accommodating the balls is arranged on the rotating bracket, and an annular ball groove for accommodating the rolling of the balls is arranged on the base.

[0008] As an improvement, the rotation holes are round holes, and the moving holes are long holes.

[0009] As an improvement, the piezoelectric drive mechanism drives the rotation of the rotating bracket by using a spring piece; the spring piece is annular and linked with the rotating bracket; an elastic clamping piece for clamping a push rod of the piezoelectric drive mechanism is axially arranged at the edge of the spring piece.

[0010] As an improvement, the spring piece and the rotating bracket are bonded and embedded by using glue, and are positioned through positioning holes on the spring piece and positioning pins on the rotating bracket.

[0011] As an improvement, a number of permanent magnets I are fixed on the rotating bracket, and iron sheets that can be attracted to the permanent magnets I are arranged on the base to form a magnetic adsorption elastic system.

[0012] As an improvement, a permanent magnet II is fixed on the rotating bracket, and the permanent magnet II penetrates through the base and cooperates with the closed-loop components on the control circuit board below the base.

[0013] As an improvement, a gasket is arranged between the rotating bracket and the blade.

[0014] The beneficial effects of the present utility model are as follows:

[0015] For the variable aperture mechanism with the above structure, after being powered on, the piezoelectric drive mechanism can drive the ring-shaped rotating bracket to rotate clockwise or counterclockwise, and the blades can rotate towards the inner center or the outside along with the rotation of the rotating bracket. All the blades can move synchronously under the drive of the rotating bracket. When all the blades rotate towards the inner center at the same time, the aperture can be shielded to reduce the area of the aperture. When all the blades rotate towards the outside at the same time, the area of the aperture can be enlarged. The present utility model is small in volume, compact and simple in structure, can achieve stepless adjustment and has high adjustment precision. Description of the Drawings

[0016] Figure 1 is an exploded view of the present utility model.

[0017] Figure 2 is a schematic diagram of the rotating bracket driving the blade to rotate.

[0018] Figure 3 is a schematic diagram of the structure of the blade.

[0019] Figure 4 is a schematic diagram of the cooperation between the elastic sheet and the piezoelectric drive mechanism.

[0020] Figure 5A is a schematic diagram of the front of the rotating bracket.

[0021] Figure 5B is a schematic diagram of the back of the rotating bracket.

[0022] Figure 6 is a schematic diagram of the structure of the base.

[0023] Figure 7 is a schematic diagram of the structure of the gasket.

[0024] Figure 8 is a schematic diagram of the structure of the control circuit board.

[0025] Markings in the figure:

[0026] 1 - Top cover; 2 - Blades; 3 - Gasket; 4 - Elastic sheet; 5 - Rotating bracket; 6 - Ball; 7 - Permanent magnet; 8 - Iron sheet; 9 - Piezoelectric drive mechanism; 10 - Base; 11 - Control circuit board;

[0027] 21 - Rotating hole; 22 - Moving hole;

[0028] Positioning hole; 32 - Waist-shaped hole;

[0029] 41 - Positioning hole; 42 - Glue dispensing hole; 43 - Clamping piece;

[0030] 51 - Positioning pin; 52 - Glue dispensing groove; 53 - Magnet groove II; 54 - Raceway; 55 - Magnet groove I

[0031] 101 - Positioning post; 102 - Ball groove; 103 - PIN groove; 104 - Iron sheet groove;

[0032] 111 - Welding hole; 112 - Hall element groove. Detailed implementation manner

[0033] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below in conjunction with the specific implementation manner.

[0034] As Figure 1 shown, the present utility model provides a variable aperture mechanism driven by piezoelectricity, including an aperture surrounded by a plurality of blades 2 arranged in a circle; the blades 2 can rotate with the rotating bracket 5, so that when the piezoelectric drive mechanism 9 drives the rotating bracket 5 to rotate circumferentially, the rotating bracket 5 drives the blades 2 to move closer to the center to reduce the area of the aperture, or the rotating bracket 5 drives the blades 2 to spread outwards to expand the area of the aperture.

[0035] As Figure 2 shown, the principle of the present utility model is that: after being powered on, the piezoelectric drive mechanism 9 can drive the annular rotating bracket 5 to rotate clockwise or counterclockwise, and the blades 2 can rotate towards the inner center or outwards with the rotation of the rotating bracket 5, and all the blades 2 can move synchronously under the drive of the rotating bracket 5, so that when all the blades 2 rotate towards the inner center at the same time, the aperture can be shielded to reduce the area of the aperture. And when all the blades 2 rotate outwards at the same time, the area of the aperture can be expanded.

[0036] More specifically, it further includes a base 10 for support, and the base 10 can be fastened with the top cover 1 to shield the internal components. The rotating bracket 5 and the base 10 can rotate relative to each other; as Figure 3 、 Figure 5A 、 Figure 5B 、 Figure 6As shown, a rotation hole 21 and a movement hole 22 are formed in the blade 2; the rotation hole 21 is sleeved on a positioning post 101 provided on the base 10, so that the blade 2 can rotate along the positioning post 101; the movement hole 22 is sleeved on a positioning pin 51 provided on the rotation bracket 5, so that when the rotation bracket 5 rotates, the blade 2 can be driven to rotate. More specifically, the rotation hole 21 is a circular hole, and the movement hole 22 is an elongated hole. The reason for setting the movement hole 22 as an elongated hole is that the rotation of the blade 2 and the rotation radian of the rotation bracket 5 are not consistent. To avoid interference, the movement hole 22 is set as an elongated hole so that the positioning pin 51 has a certain clearance in the elongated hole.

[0037] In order to make the rotation between the rotation bracket 5 and the base 10 smoother, a number of ball bearings 6 are provided between the base 10 and the rotation bracket 5. A raceway 54 for accommodating the ball bearings 6 is provided on the rotation bracket 5, and an annular ball groove 102 for accommodating the rolling of the ball bearings 6 is provided on the base 10.

[0038] In the present utility model, the piezoelectric drive mechanism 9 drives the rotation bracket 5 to rotate by using the elastic sheet 4; the elastic sheet 4 is annular and is linked with the rotation bracket 5; an elastic clamping piece 43 for clamping the push rod 91 of the piezoelectric drive mechanism 9 is axially arranged at the edge of the elastic sheet 4. The distance between the two clamping pieces 43 is smaller than the diameter of the push rod 91 on the piezoelectric drive mechanism 9. Therefore, when the push rod 91 is placed therein, the two clamping pieces will generate a clamping force on it. When the piezoelectric 92 inputs a drive signal, due to the inverse piezoelectric effect, it will generate deformation. Since the push rod 91 is bonded to it, it will drive the push rod 91 to elongate or shorten axially. Since the elastic sheet 4 is clamped on the push rod 91, when the elongation speed of the push rod 91 is fast enough, a relative displacement is generated between the two, and the push rod 91 generates a frictional force on the elastic sheet 4, and drives the elastic sheet 4 to move under the action of the frictional force, realizing the function of the actuation of the elastic sheet 4.

[0039] In order to realize the linkage between the elastic sheet 4 and the rotation bracket 5, the elastic sheet 4 and the rotation bracket 5 are bonded and buried by dispensing glue (dispensing glue from the dispensing hole 42 on the elastic sheet 4 into the dispensing groove 52 on the rotation bracket 5), and are positioned by the positioning hole 41 on the elastic sheet 4 and the positioning pin 51 on the rotation bracket 5.

[0040] In addition, a number of permanent magnets I7 are fixed on the rotation bracket 5, and the permanent magnets I7 are bonded in the magnet slots 55 by glue. An iron sheet 8 that can be attracted to the permanent magnets I7 is provided on the base 10 to form a magnetic adsorption elastic system, and the iron sheet 8 is fixed in the iron sheet groove 104. Through the attraction between the permanent magnets I7 on the rotation bracket 5 and the iron sheet 8 on the base 10, the rotation bracket 5 and the base 10 can be clamped tightly, so that when performing multi-posture actuation, the actuation states are consistent.

[0041] A permanent magnet II is also fixed on the rotating bracket 5 and is adhesively bonded in the magnet groove II 53. The height of the permanent magnet II is different from that of the permanent magnet I 7. The permanent magnet II penetrates through the base 10 and cooperates with the closed-loop components on the control circuit board 11 below the base 10. The closed-loop components can sense the permanent magnet II and are used to sense the rotation of the rotating bracket 5, so as to perform closed-loop control. In addition, the Hall element on the control circuit board 11 can be fixed in the Hall element groove 112 on the control circuit board 11.

[0042] In some embodiments, a gasket 3 is provided between the rotating bracket 5 and the blade 2, which can reduce the friction between the blade 2 and the rotating bracket 5.

[0043] The assembly process of the present utility model is as follows:

[0044] Clamp the push rod of the piezoelectric drive mechanism on the clamping piece of the elastic piece. The positioning hole 41 on the elastic piece 4 corresponds to and is connected to the positioning pin 51 on the rotating bracket 5. The clamping piece 43 corresponds to the notch position, and glue is applied and bonded in the glue application groove 52. Then, after applying glue in the magnet groove I 55, the permanent magnet I 7 is placed to complete the assembly of the permanent magnet I 7. Glue is applied in the magnet groove II 53 and the permanent magnet II is placed therein.

[0045] Place the ball 7 in the ball groove 102 on the base 10, and bond the iron sheet 8 to the iron sheet groove 104. Place the assembled piezoelectric drive mechanism 9, elastic piece 4, and rotating bracket 5 into the base 10. The PIN foot 93 of the piezoelectric drive mechanism 9 corresponds to the PIN groove 103 on the base 10, and the piezoelectric drive mechanism 9 is bonded to the base 10 to fix it to the base 10. After assembly, the rotating bracket 5 accommodates the ball 6 through the raceway 54.

[0046] The gasket 3 is connected to the positioning post 101 on the base 10 through the positioning hole 31, and the waist-shaped hole 32 passes through the positioning pin 51 of the rotating bracket 5. After the gasket 3 is installed, the rotation hole 21 of the blade 2 is matched with the positioning post 101 on the base 10, and the moving hole 22 is matched with the positioning pin 51 on the rotating bracket 5. Similarly, the remaining blades 2 are assembled in sequence to complete the assembly of the blades 2. Then, the top cover 1 is installed and fixed with glue. Finally, the control circuit board 11 is bonded to the base 10, and the welding holes 111 are aligned with the PIN feet 93 of the piezoelectric drive mechanism and welding operations are performed.

[0047] The above is only the preferred embodiment of the present utility model. It should be noted that the above preferred embodiment should not be regarded as a limitation of the present utility model. The protection scope of the present utility model should be subject to the scope defined by the claims. For those of ordinary skill in the art in this technical field, without departing from the spirit and scope of the present utility model, several improvements and retouches can also be made, and these improvements and retouches should also be regarded as the protection scope of the present utility model.

Claims

1. A variable aperture mechanism driven by piezoelectricity, characterized in that: It includes an aperture surrounded by several blades arranged circumferentially; the blades can rotate with a rotating bracket, so that when the piezoelectric driving mechanism drives the rotating bracket to rotate circumferentially, the rotating bracket drives the blades to move closer to the center to reduce the area of the aperture, or the rotating bracket drives the blades to spread outwards to expand the area of the aperture; It further includes a base, and the rotating bracket and the base can rotate relative to each other; rotation holes and moving holes are formed in the blades; the rotation holes are sleeved on positioning posts arranged on the base, so that the blades can rotate along the positioning posts; the moving holes are sleeved on positioning pins arranged on the rotating bracket, so that when the rotating bracket rotates, it can drive the blades to rotate; Several permanent magnets I are fixed on the rotating bracket, and iron sheets capable of attracting and combining with the permanent magnets I are arranged on the base to form a magnetic attraction elastic system.

2. The variable aperture mechanism driven by piezoelectricity according to claim 1, characterized in that: Several ball bearings are arranged between the base and the rotating bracket.

3. The variable aperture mechanism driven by piezoelectricity according to claim 2, wherein: Raceways for accommodating the ball bearings are arranged on the rotating bracket, and annular ball grooves for accommodating the rolling of the ball bearings are arranged on the base.

4. The variable aperture mechanism driven by piezoelectricity according to claim 1, characterized in that: The rotation holes are circular holes, and the moving holes are long holes.

5. A variable aperture mechanism driven by piezoelectricity according to claim 1, characterized in that: The piezoelectric driving mechanism drives the rotation of the rotating bracket by using a spring piece; the spring piece is annular and linked with the rotating bracket; elastic clamping pieces for clamping a push rod of the piezoelectric driving mechanism are axially arranged at the edge of the spring piece.

6. The variable aperture mechanism driven by piezoelectricity according to claim 5, wherein: The spring piece and the rotating bracket are bonded and embedded by using glue, and are positioned through positioning holes on the spring piece and positioning pins on the rotating bracket.

7. A variable aperture mechanism driven by piezoelectric according to claim 1, characterized in that: Permanent magnets II are fixed on the rotating bracket, and the permanent magnets II penetrate through the base and cooperate with closed-loop elements on a control circuit board below the base.

8. A variable aperture mechanism driven by piezoelectricity according to claim 1, characterized in that: A gasket is arranged between the rotating bracket and the blades.

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