CN218446152U

CN218446152U - Piezoelectric type camera driving device

Info

Publication number: CN218446152U
Application number: CN202223019159.7U
Authority: CN
Inventors: 王忠岭; 吴发权; 霍亮
Original assignee: Liaoning Zhonglan Photoelectric Technology Co Ltd
Current assignee: Liaoning Zhonglan Photoelectric Technology Co Ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-02-03
Anticipated expiration: 2032-11-14

Abstract

The utility model relates to the technical field of optical element driving, in particular to a piezoelectric type camera driving device, which comprises a prepressing component, a camera lens component, a position sensing component and a circuit board; the camera lens assembly comprises at least two fixed lens groups and at least one movable lens group; the fixed lens group is fixed on the first retaining walls at the two ends of the base; the movable lens group is in sliding connection with a guide rod fixed in the base; the pre-compaction subassembly includes the magnetite, the piezoceramics oscillator, and the piece is inhaled to antifriction plate and magnetism, and the magnetite is fixed at the surface of the second barricade of base both sides, the inboard and the contact of piezoceramics oscillator of magnetite, the contact of piezoceramics oscillator and antifriction plate, and the antifriction plate is fixed on the magnetism piece, and the magnetism is inhaled the piece and is connected with movable lens group, and the magnetism is inhaled piece and magnetite and is produced magnetic attraction. The utility model discloses a pre-compaction subassembly of formula is inhaled to magnetism has replaced traditional reed pre-compaction structure, has overcome the easy cracked risk of reed, prolongs the life of guide arm, has increased the drive power of camera lens carrier.

Description

Piezoelectric type camera driving device

Technical Field

The utility model belongs to the technical field of the optical element drive technique and specifically relates to a piezoelectric type drive arrangement that makes a video recording is related to.

Background

At present, in order to adapt to application scenes with higher requirements, a piezoelectric driving device is gradually adopted to replace a voice coil motor in a handheld camera device, particularly a camera driving device of a mobile phone, so that application limitations of main shooting, auxiliary shooting, wide angles, micro distances, medium and low-power long focuses and the like of medium and low loads and medium and low displacements are broken through, large-load and large-displacement driving is facilitated, and ultra-long-distance shooting is realized.

Most of the existing piezoelectric driving devices adopt reed prepressing, and the following problems still exist in the using process: 1. the reed is easy to break, and prepressing can not be generated after the reed is broken; 2. the applied pre-pressure directly acts between the lens carrier and the guide rod, the generated friction force is large, the friction service life of the guide rod is influenced, and the driving force of the lens carrier is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcoming, the deficiency of prior art, the utility model provides a piezoelectric type drive arrangement that makes a video recording, it has solved the easy fracture of reed in the current drive arrangement to and the big technical problem of frictional force between camera lens carrier and guide arm.

In order to achieve the above object, the utility model discloses a main technical scheme include:

the utility model provides a piezoelectric camera driving device, which comprises a base, a prepressing component, a camera lens component, a guide rod, a position sensing component and a circuit board; the camera lens assembly comprises at least two fixed lens groups and at least one movable lens group; the fixed lens group is fixed on first retaining walls at two ends of the base; the movable lens group is in sliding connection with a guide rod fixed in the base; the prepressing assembly comprises a magnet, a piezoelectric ceramic vibrator, an abrasion-resistant plate and a magnetic suction piece, the magnet is fixed on the outer surface of a second retaining wall on two sides of the base, the inner side of the magnet is in contact with one side of the piezoelectric ceramic vibrator fixed in the second retaining wall, the other side of the piezoelectric ceramic vibrator is in contact with the abrasion-resistant plate, the abrasion-resistant plate is fixed on the magnetic suction piece, the magnetic suction piece is connected with the movable lens group, and the magnetic suction piece and the magnet generate magnetic suction force to generate prepressing force on the piezoelectric ceramic vibrator; the position sensing assembly is arranged at the position corresponding to the base and the movable lens group, the circuit board is fixed on the second baffle, and the circuit board is respectively and electrically connected with the pre-pressing assembly and the position sensing assembly.

Further, the pre-compaction subassembly still includes fixed frame, fixed frame with the second keeps off the wall outside fixed, the magnetite is fixed in fixed frame.

Further, the magnetic absorption sheet comprises a vertical protrusion and a flexible clamping jaw, the vertical protrusion is fixed with the wear-resisting plate, and the vertical protrusion is used for generating magnetic attraction with the magnet; the flexible clamping claws are clamped with the movable lens group, so that the movable lens group only generates a force vertical to the optical axis direction.

Furthermore, the position sensing assembly comprises a sensing part and a positioning part, the positioning part is positioned on the bottom surface of the movable lens group, and the sensing part is positioned on the bottom surface inside the base; the induction piece and the positioning piece are overlapped along the direction of the optical axis; the sensing piece is electrically connected with the circuit board.

Further, a metal reinforcing part is arranged inside the base and is respectively connected with the position sensing assembly and the circuit board.

Furthermore, the movable lens group comprises a lens and a lens carrier, the lens is fixed in the lens carrier, and a through hole for the guide rod to pass through is formed in the side edge of the lens carrier.

Further, still include the protective housing, the protective housing cover is established the outside of base.

The beneficial effects of the utility model are that: the utility model provides a pair of piezoelectric type drive arrangement that makes a video recording, the utility model discloses a prepressing assembly of formula has replaced traditional reed pre-compaction structure to be inhaled to magnetism, has effectively overcome the easy cracked risk of reed.

The utility model discloses a prepressing assembly of formula is inhaled to magnetism provides the precompression for the piezoceramics oscillator, makes the guide arm not receive the normal pressure of perpendicular to optical axis direction to reduce the camera lens carrier of portable camera lens group and the frictional force between the guide arm, prolonged the life of guide arm, simultaneously, indirectly increased the drive power of the camera lens carrier of portable camera lens group.

Drawings

Fig. 1 is an overall structural diagram of the piezoelectric camera driving device of the present invention;

FIG. 2 is a schematic view of the connection structure of the piezoelectric ceramic vibrator and the base of the present invention;

fig. 3 is an exploded view of the pre-pressing assembly of the present invention;

fig. 4 is a schematic view of the structure of the movable lens group of the present invention cooperating with the magnetic attraction sheet;

fig. 5 is a schematic structural view of the camera lens assembly of the present invention cooperating with the guide rod;

fig. 6 is a schematic structural diagram of the position sensing assembly of the present invention;

fig. 7 is a schematic structural view of the protective housing and the base of the present invention.

In the figure: 1. a base; 11. a first retaining wall; 12. a second retaining wall; 2. a pre-pressing component; 21. a magnet; 22. a piezoelectric ceramic vibrator; 23. a wear plate; 24. a magnetic attraction sheet; 241. a vertical protrusion; 242. a flexible jaw; 25. a fixing frame; 3. a camera lens assembly; 31. fixing the lens group; 32. a movable lens group; 321. a lens; 322. a lens carrier; 323. a through hole; 4. a guide bar; 5. a position sensing assembly; 51. a sensing member; 52. a positioning member; 6. a circuit board; 7. a protective shell.

Detailed Description

For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.

Example 1:

the present invention will be described in detail with reference to the accompanying drawings:

as shown in fig. 1, the present invention provides a piezoelectric camera driving device. This piezoelectric type drive arrangement that makes a video recording includes the base: the device comprises a pre-pressing assembly 2, a camera lens assembly 3, a guide rod 4, a position sensing assembly 5 and a circuit board 6.

Referring to fig. 1 and 5, the camera lens assembly 3 includes at least two fixed lens groups 31 and at least one movable lens group 32. The fixed lens group 31 is fixed to the base: 1 in the circular clamping grooves on the first retaining walls 11 at the two ends. The movable lens group 32 is located at the base: 1, and the movable lens group 32 is fixed to the base: two guide rods 4 in the guide rod 1 are connected in a sliding mode, and the guide rods 4 can slide freely along the direction of an optical axis. Specifically, the two ends of the guide rod 4 are connected with the base: the inner walls of the first walls 11 at both ends of the movable lens group 1 are fixed, and the movable lens group 32 can freely slide between the two guide rods 4. The movable lens group 32 includes lenses 321 and a lens carrier 322. The lens 321 is fixed in the lens carrier 322, and the side of the lens carrier 322 is provided with a through hole 323 for the guide rod 4 to pass through. The lens 321 and the lens carrier 322 of the present invention can be made into independent parts respectively, and fixed by mechanical assembly; the lens 321 and the lens carrier 322 can also be made into a whole by using an insert molding method. The installation and the dismantlement are convenient.

One side of pre-compaction subassembly 2 with set up at the base: 1, the movable lens group 32 in the lens module is connected, and the other side of the pre-pressing component 2 is connected with the base: 1 are connected with the second retaining walls 12 at both sides. The position sensing assembly 5 is disposed on the base: 1, and the movable lens group 32. The circuit board 6 is fixed on the second retaining wall 12, and the circuit board 6 is electrically connected to the pre-pressing assembly 2 and the position sensing assembly 5 respectively. Specifically, the circuit board 6 is riveted and fixed to the upper end face of the second baffle wall 12, and electrodes of the circuit board 6 are connected to the metal reinforcement of the upper end face of the second baffle wall 12 and electrodes of the piezoelectric ceramic vibrator 22, respectively.

Wherein, the base: 1 are provided with metal reinforcements connected to the position sensing assembly 5 and the circuit board 6, respectively. Specifically, the base: 1 is made by plastics material, base: 1 the internal inlay has the metal reinforcement, and on the one hand, the base can be strengthened to the metal reinforcement: 1, on the other hand, the metal reinforcing member also has the function of conducting the position sensing assembly 5 and the piezoelectric ceramic vibrator 22 in the pre-pressing assembly 2 through the circuit board 6.

Specifically, referring to fig. 2, 3 and 4, the pre-pressing assembly 2 includes a magnet 21, a piezoelectric ceramic vibrator 22, a wear plate 23 and a magnetic suction piece 24. The magnet 21 is fixed on the outer surface of the second baffle wall 12, the inner side of the magnet 21 is in contact with one side of the piezoelectric ceramic vibrator 22 fixed in the second baffle wall 12, and the other side of the piezoelectric ceramic vibrator 22 is in close contact with the wear plate 23. The wear plate 23 is fixed on the magnetic attraction sheet 24, the magnetic attraction sheet 24 is connected with the movable lens group 32, and the magnetic attraction sheet 24 and the magnet 21 generate a magnetic attraction force to generate a pre-stress on the piezoelectric ceramic vibrator 22. After the power is supplied, the whole piezoelectric ceramic vibrator 22 generates a standing wave motion changing towards a certain direction along the optical axis direction, and the standing wave motion is converted into a linear motion in a corresponding direction of the movable lens group 32 through the friction motion of the piezoelectric ceramic vibrator 22 and the wear plate 23.

Specifically, referring to FIG. 4, the magnetically attractive tab 24 includes a vertical projection 241 and a flexible pawl 242. The vertical protrusion 241 is bonded and fixed to the wear plate 23, and the vertical protrusion 241 generates a magnetic attraction force with the magnet 21 to generate a preload force on the piezoelectric ceramic vibrator 22. The flexible claws 242 are made of a flexible material, and the flexible claws 242 are fixed to the movable lens group 32 in a snap-fit manner, so that the movable lens group 32 only generates a force in a direction perpendicular to the optical axis and is not stressed in a direction parallel to the optical axis.

In some embodiments, referring to fig. 3, the pre-pressing assembly 2 further includes a fixing frame 25, and the magnet 21 is fixed on the second retaining wall 12 through the fixing frame 25. The fixed frame 25 is fixed to the outside of the second retaining wall 12, and the magnet 21 is fixed in the fixed frame 25. The fixing frame 25 is riveted and fixed to the riveting column on the outer side of the second retaining wall 12, and the magnet 21 is fixed to the middle of the fixing frame 25.

Specifically, referring to fig. 6, the position sensing unit includes a sensing member 51 and a positioning member 52. The positioning member 52 is located in a bar-shaped fixing groove on the bottom surface of the movable lens group 32, and the sensing member 51 is located at the base: 1 in the positioning groove on the bottom surface inside. The sensing member 51 and the positioning member 52 are overlapped in the optical axis direction; the sensing member 51 is electrically connected to the circuit board 6. The sensing member 51 senses the position change of the positioning member 52 and transmits a corresponding signal to the control system, so as to control the deformation motion cycle and the motion quantity of the piezoceramic vibrator 22 to adjust the lens carrier 322 relative to the base: 1 to achieve closed loop control.

In some embodiments, referring to fig. 7, the piezoelectric camera driving device further includes a protective shell 7, where the protective shell 7 covers the base: 1 for protecting the piezoelectric image pickup drive device. The protective shell 7 is provided with a light through hole, and the light through hole and the movable lens group 32 use the same optical axis.

The utility model provides a pair of piezoelectric type drive arrangement that makes a video recording's theory of operation does:

after the driving device is powered on, the whole piezoelectric ceramic vibrator 22 generates a standing wave motion varying forwards or backwards along the optical axis direction according to the direction of the loaded voltage, and the standing wave motion is converted into a straight-line motion of the lens carrier 322 of the movable lens group 32 forwards or backwards through the friction motion of the piezoelectric ceramic vibrator 22 and the wear-resisting plate 23, so as to adjust the focal length of the lens 321 and the like. During the moving of the movable lens group 32, the pre-pressing component 2 provides pre-pressing force for the movement of the piezoelectric ceramic vibrator 22.

The utility model overcomes the easy cracked risk of reed among the traditional reed pre-compaction structure makes guide arm 4 not receive the normal pressure of perpendicular to optical axis direction to reduce the frictional force between camera lens carrier 322 of portable camera lens group 32 and the guide arm 4, prolonged guide arm 4's life, simultaneously, indirectly increased the drive power of camera lens carrier 322 of portable camera lens group 32.

Claims

1. A piezoelectric image pickup driving device is characterized in that: the camera lens module comprises a base, a prepressing assembly, a camera lens assembly, a guide rod, a position sensing assembly and a circuit board; the camera lens assembly comprises at least two groups of fixed lenses and at least one group of movable lenses; the fixed lens group is fixed on first retaining walls at two ends of the base; the movable lens group is in sliding connection with a guide rod fixed in the base;

the prepressing assembly comprises a magnet, a piezoelectric ceramic vibrator, an abrasion-resistant plate and a magnetic suction piece, wherein the magnet is fixed on the outer surface of a second retaining wall on two sides of the base, the inner side of the magnet is in contact with one side of the piezoelectric ceramic vibrator fixed in the second retaining wall, the other side of the piezoelectric ceramic vibrator is in contact with the abrasion-resistant plate, the abrasion-resistant plate is fixed on the magnetic suction piece, the magnetic suction piece is connected with the movable lens group, and the magnetic suction piece and the magnet generate magnetic suction force to generate prepressing force on the piezoelectric ceramic vibrator;

the position sensing assembly is arranged at a position corresponding to the base and the movable lens group, the circuit board is fixed on the second wall, and the circuit board is electrically connected with the pre-pressing assembly and the position sensing assembly respectively.

2. The piezoelectric image pickup driving device according to claim 1, wherein: the pre-compaction subassembly still includes fixed frame, fixed frame with the second keeps off the wall outside fixed, the magnetite is fixed in fixed frame.

3. The piezoelectric type image pickup driving apparatus according to claim 1, wherein: the magnetic attraction piece comprises a vertical protruding part and a flexible clamping jaw, the vertical protruding part is fixed with the wear-resisting plate, and the vertical protruding part is used for generating magnetic attraction with the magnet; the flexible clamping claws are clamped with the movable lens group, so that the movable lens group only generates a force vertical to the optical axis direction.

4. The piezoelectric type image pickup driving apparatus according to claim 1, wherein: the position sensing assembly comprises a sensing piece and a positioning piece, the positioning piece is positioned on the bottom surface of the movable lens group, and the sensing piece is positioned on the bottom surface inside the base; the induction piece and the positioning piece are overlapped along the direction of the optical axis; the sensing piece is electrically connected with the circuit board.

5. The piezoelectric image pickup driving device according to claim 1, wherein: the inside of base is equipped with the metal reinforcement, the metal reinforcement respectively with position sensing subassembly with the circuit board is connected.

6. The piezoelectric image pickup driving device according to claim 1, wherein: the movable lens group comprises a lens and a lens carrier, the lens is fixed in the lens carrier, and a through hole for the guide rod to pass through is formed in the side edge of the lens carrier.

7. The piezoelectric image pickup driving device according to claim 1, wherein: still include the protective housing, the protective housing cover is established the outside of base.