阅读说明：本技术 压电驱动的无级变焦镜头模组及驱动方法 (Piezoelectric driven stepless zoom lens module and driving method ) 是由 黄虎 刘艳伟 徐智 李轩 于 2021-08-19 设计创作，主要内容包括：本发明涉及一种压电驱动的无级变焦镜头模组及驱动方法,属于变焦镜头和摄影技术设备领域。该装置包括力协调框架、导向轴、运动驱动单元、光学镜头群、镜头基座和端盖支架。两组运动驱动单元分别连接在镜头基座的两侧并将光学镜头群嵌进镜头基座组成镜头调距单元；用两根导向轴将两块镜头调距单元串联,放进力协调框架之间过盈装配；导向轴用端盖支架进行固定,端盖支架与力协调框架分离不接触。该方法利用压电晶片受电压激励产生形变带动运动驱动单元运动,驱动镜头调距单元,以此改变两块光学镜头群之间的距离,进行光学变焦。结构简单紧凑、体积小,安装方便；通过改变激励电压实现快速平稳变焦和各种变焦模式。(The invention relates to a piezoelectric driven stepless zoom lens module and a driving method, belonging to the field of zoom lenses and photographic technical equipment. The device comprises a force coordination frame, a guide shaft, a motion driving unit, an optical lens group, a lens base and an end cover bracket. The two groups of motion driving units are respectively connected to two sides of the lens base and embed the optical lens group into the lens base to form a lens distance adjusting unit; two lens distance adjusting units are connected in series by two guide shafts and are placed between the force coordination frames for interference assembly; the guide shaft is fixed by an end cover bracket, and the end cover bracket is separated from the force coordination frame and is not contacted with the force coordination frame. The method utilizes the piezoelectric wafer to be excited by voltage to deform to drive the motion driving unit to move and drive the lens distance adjusting unit, so as to change the distance between two optical lens groups and carry out optical zooming. The structure is simple and compact, the volume is small, and the installation is convenient; fast and smooth zooming and various zooming modes are realized by changing the excitation voltage.)

1. Piezoelectricity driven stepless zoom lens module, its characterized in that: the device comprises a force coordination frame (1), a guide shaft (2), a motion driving unit (3), an optical lens group (4), a lens base (5) and an end cover bracket (6); the two groups of motion driving units (3) are respectively connected to two sides of the lens base (5) and embed the optical lens group (4) into the lens base (5) to form a lens distance adjusting unit; two lens distance adjusting units are connected in series by two guide shafts (2) and are placed between the force coordination frames (1) for interference assembly; the guide shaft (2) is fixed by an end cover bracket (6), and the end cover bracket (6) is separated from the force coordination frame (1) and is not contacted.

2. A piezo-electrically driven stepless zoom lens module according to claim 1, characterized in that: the force coordination frame (1) is of a U-shaped frame structure, through holes are discontinuously formed in the position, close to the side plates, of the bottom plate of the force coordination frame, and the purpose is to enable the motion driving unit (3) to be subjected to constant external force in the motion process.

3. A piezo-electrically driven stepless zoom lens module according to claim 1, characterized in that: the motion driving unit (3) comprises a piezoelectric wafer A (3-1), a substrate A (3-2), an I-shaped frame (3-3), a substrate B (3-4) and a piezoelectric wafer B (3-5), wherein the piezoelectric wafer A (3-1) is pasted on the substrate A (3-2), the piezoelectric wafer B (3-5) is pasted on the substrate B (3-4), and the other surfaces of the substrate A (3-2) and the substrate B (B3-4) are respectively pasted on the two sides of the I-shaped frame (3-3) to form the motion driving unit (3); wherein the specification of the piezoelectric wafer A (3-1) is consistent with that of the piezoelectric wafer B (3-5); substrate A (3-2) thick bottom d_AIs less than the thickness d of the substrate B (3-4)_BTherefore, the difference of the first-order transverse vibration frequencies of the two substrates is ensured, and the synthesized sawtooth waveform motion is realized by applying different excitation voltage signals to the substrate A (3-2) and the substrate B (3-4).

4. The driving method of the piezo-electrically driven zoom lens system according to claim 3, wherein: the method comprises the following steps:

a) mounting a zoom lens module according to the above claims, and connecting the driving circuits to the piezoelectric chip a (3-1) and the piezoelectric chip B (3-5) of the four sets of motion driving units (3), respectively; wherein the four piezoelectric wafers A (3-1) are connected with the same output excitation voltage U₁Four piezoelectric wafers B (3-5) are connected to the same output excitation voltage U ═ Asin ω t + a₂＝Asin2ωt+A；

b) The piezoelectric chip A (3-1) is electrified to generate deformation, and the substrate A (3-2) is driven to generate bending deformation delta₁The piezoelectric chip B (3-5) is electrified to generate deformation, and the substrate B (3-4) is driven to generate bending deformation delta₂The displacement of the motion driving unit (3) is synthesized through the I-shaped frame (3-3);

c) the friction between the base plate and the side plate of the force balance frame (1) enables the motion driving units (3) at the two sides of the lens distance adjusting unit to generate motion displacement and drive the lens distance adjusting unit to move along the direction of the guide shaft (2);

d) the time sequence control of the excitation voltage of the motion driving units (3) of the two groups of head distance adjusting units is adjusted, so that the lens zooming states of various modes can be obtained;

e) varying the voltage U₁And U₂The phase, amplitude and frequency of the lens to adjust the zoom speed of the lens.

Technical Field

The invention relates to the field of zoom lenses and photographic technical equipment, in particular to a piezoelectric driven stepless zoom lens module and a driving method. The inverse piezoelectric effect of the piezoelectric wafer is utilized to drive the lens distance adjusting unit to realize stable and rapid zooming of the lens. The defects of slow and unstable zooming, single zooming mode and the like of the traditional mechanical focusing are overcome. The method has wide application prospect in the fields of precision instruments, intelligent terminal equipment, camera shooting and the like.

Background

The piezoelectric driving technology plays an important role in the field of precision machinery due to the remarkable advantages of high precision, quick response, no electromagnetic interference and the like. The inverse piezoelectric effect of the piezoelectric material is utilized to convert the electric energy into the mechanical energy and provide the displacement output of the nanometer level.

The zoom technique plays an important role in obtaining a high-quality and high-definition photographed picture. The current lens zooming technology usually adopts a voice coil motor to drive, and cooperates with a mechanical structure to move a lens barrel to realize zooming. Too many assembly parts can lead to complicated mechanical structure and large volume; meanwhile, due to the instability of stress, the problems of limited zoom displacement, poor control precision, low focusing efficiency and the like are caused.

Disclosure of Invention

The invention aims to provide a piezoelectric driven stepless zoom lens module and a driving method thereof, aiming at improving the zooming speed and the stability of a zoom lens and expanding the focusing mode,

the above object of the present invention is achieved by the following technical solutions:

piezoelectricity driven stepless zoom lens module, its characterized in that: the device comprises a force coordination frame 1, a guide shaft 2, a motion driving unit 3, an optical lens group 4, a lens base 5 and an end cover bracket 6; the two groups of motion driving units 3 are respectively connected to two sides of the lens base 5 and embed the optical lens group 4 into the lens base 5 to form a lens distance adjusting unit; two lens distance adjusting units are connected in series by two guide shafts 2 and are placed between the force coordination frames 1 for interference assembly; the guide shaft 2 is fixed with an end cap support 6, and the end cap support 6 is separated from the force-coordinating frame 1 without contact.

The piezoelectric driven stepless zoom lens module is characterized in that: the force coordination frame 1 is of a U-shaped frame structure, through holes are discontinuously formed in the position, close to the side plates, of the bottom plate of the force coordination frame, and the purpose is to enable the motion driving unit 3 to be subjected to constant external force in the motion process.

The piezoelectric driven stepless zoom lens module is characterized in that: the motion driving unit 3 comprises a piezoelectric waferA3-1, a substrate A3-2, an I-shaped frame 3-3, a substrate B3-4 and a piezoelectric wafer B3-5, wherein the piezoelectric wafer A3-1 is pasted on the substrate A3-2, the piezoelectric wafer B3-5 is pasted on the substrate B3-4, and the other surfaces of the substrate A3-2 and the substrate B3-4 are respectively pasted on the two sides of the I-shaped frame 3-3 to form a motion driving unit 3; wherein the specification of the piezoelectric wafer A3-1 is consistent with that of the piezoelectric wafer B3-5; substrate A3-2 thick bottom d_ALess than the thickness d of the substrate B3-4_BThus, the difference of the first-order transverse vibration frequencies of the two substrates is ensured, and the synthesized sawtooth waveform motion is realized by applying different excitation voltage signals to the substrate A3-2 and the substrate B3-4.

Another object of the present invention is to provide a driving method of a piezo-driven zoom lens, which includes the steps of:

a) mounting the zoom lens module according to the above claims, turning on the driving circuits for the piezoelectric chip A3-1 and the piezoelectric chip B3-5 of the four sets of motion driving units 3, respectively; wherein the four piezoelectric wafers A3-1 are connected with the same output excitation voltage U₁Four piezoelectric wafers B3-5 are connected with the same output excitation voltage U₂＝Asin2ωt+A；

b) The piezoelectric chip A3-1 is deformed by electricity to drive the substrate A3-2 to generate bending deformation delta₁The piezoelectric chip B3-5 is deformed by electricity to drive the substrate B3-4 to generate bending deformation delta₂The displacement of the motion driving unit 3 is synthesized through the I-shaped frame 3-3;

c) the friction between the base plate and the side plate of the force balance frame 1 enables the movement driving units 3 at the two sides of the lens distance adjusting unit to generate movement displacement, and drives the lens distance adjusting unit to move along the direction of the guide shaft 2;

d) the time sequence control of the excitation voltage of the motion driving units 3 of the two groups of head distance adjusting units is adjusted, so that the lens zooming states in various modes can be obtained;

e) varying the voltage U₁And U₂The phase, amplitude and frequency of the lens to adjust the zoom speed of the lens.

The invention has the beneficial effects that: the piezoelectric driven stepless zoom lens module has simple and compact structure, small volume and convenient installation; the inverse piezoelectric effect of the piezoelectric wafer is utilized to enable the thin and thick substrate to generate deformation with different amplitudes, the I-shaped frame is used for deforming and synthesizing the deformation into displacement, the driving of the lens distance adjusting unit is achieved, the force balance frame guarantees that the movement driving unit is subjected to constant external force action in the movement process, and the stable and rapid zooming of the module is achieved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.

FIG. 1 is a schematic perspective view of a zoom lens module according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of an embodiment of a zoom lens module according to the present invention;

FIG. 3 is a schematic structural diagram of a force balance frame of a zoom lens module according to the present invention;

FIG. 4 is a schematic perspective view of a lens adjusting unit of the zoom lens module according to the present invention;

FIG. 5 is a schematic perspective view of a motion driving unit of a zoom lens module according to the present invention;

FIG. 6 is a schematic diagram of the displacement combination of the driving motion of the zoom lens module according to the present invention;

FIG. 7 shows a multi-mode zoom state of the zoom lens module according to the present invention;

in the figure: 1. a force balancing frame; 2. a guide shaft; 3. a motion drive unit: 3-1, piezoelectric wafer A; 3-2, a substrate A; 3-3, I-shaped frame; 3-4, a substrate B; 3-5, piezoelectric wafer B; 4. an optical lens group; 5. a lens base; 6. and (4) an end cover bracket.

Detailed Description

The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.

Referring to fig. 1 and 2, the piezoelectric driven stepless zoom lens module includes a force coordination frame 1, a guide shaft 2, a motion driving unit 3, an optical lens group 4, a lens base 5 and an end cover bracket 6; the two groups of motion driving units 3 are respectively connected to two sides of the lens base 5 and embed the optical lens group 4 into the lens base 5 to form a lens distance adjusting unit; two lens distance adjusting units are connected in series by two guide shafts 2 and are placed between the force coordination frames 1 for interference assembly; the guide shaft 2 is fixed with an end cap support 6, and the end cap support 6 is separated from the force-coordinating frame 1 without contact.

Referring to fig. 3, the force-coordinating frame 1 is a U-shaped frame structure, and through holes are intermittently formed at the bottom plate near the side plates, so that the movement driving unit 3 is subjected to a constant external force during the movement.

Referring to fig. 4, the motion driving unit 3 comprises a piezoelectric wafer A3-1, a substrate A3-2, an i-shaped frame 3-3, a substrate B3-4 and a piezoelectric wafer B3-5, wherein the piezoelectric wafer A3-1 is adhered to the substrate A3-2, the piezoelectric wafer B3-5 is adhered to the substrate B3-4, and the other surfaces of the substrate A3-2 and the substrate B3-4 are respectively adhered to two sides of the i-shaped frame 3-3 to form the motion driving unit 3; wherein the specification of the piezoelectric wafer A3-1 is consistent with that of the piezoelectric wafer B3-5; substrate A3-2 thick bottom d_ALess than the thickness d of the substrate B3-4_BThus, the difference of the first-order transverse vibration frequencies of the two substrates is ensured, and the synthesized sawtooth waveform motion is realized by applying different excitation voltage signals to the substrate A3-2 and the substrate B3-4.

Referring to fig. 5, the lens distance adjusting unit includes a motion driving unit 3, an optical lens group 4 and a lens base 5, wherein the two motion driving units 3 are respectively connected to the left and right sides of the lens base 5, and the optical lens group 4 is embedded in a central circular hole of the lens base 5.

The two end cover brackets 6 are fixed oppositely, and the two guide shafts 2 of the two lens pitch adjusting units connected in series are fixed through two fixing holes at the diagonal angles of the two end cover brackets 6.

Referring to fig. 6, a driving method of a piezo-driven zoom lens, comprising: the method comprises the following steps:

a) mounting the zoom lens module according to the above claims, turning on the driving circuits for the piezoelectric chip A3-1 and the piezoelectric chip B3-5 of the four sets of motion driving units 3, respectively; wherein the four piezoelectric wafers A3-1 are connected with the same output excitation voltage U₁Four piezoelectric wafers B3-5 are connected with the same output excitation voltage U₂＝Asin2ωt+A；

b) The piezoelectric chip A3-1 is deformed by electricity to drive the substrate A3-2 to generate bending deformation delta₁The piezoelectric chip B3-5 is deformed by electricity to drive the substrate B3-4 to generate bending deformation delta₂The displacement of the motion driving unit 3 is synthesized through the I-shaped frame 3-3;

c) the friction between the base plate and the side plate of the force balance frame 1 enables the movement driving units (3) at the two sides of the lens distance adjusting unit to generate movement displacement and drive the lens distance adjusting unit to move along the direction of the guide shaft);

d) the time sequence control of the excitation voltage of the motion driving units 3 of the two groups of head distance adjusting units is adjusted, so that the lens zooming states in various modes can be obtained;

e) varying the voltage U₁And U₂The phase, amplitude and frequency of the lens to adjust the zoom speed of the lens.

Example (b):

referring to fig. 7, by adjusting the timing control of the excitation voltages of the two sets of pitch adjusting units, a plurality of modes of the zoom state of the lens can be obtained: the two groups of lens distance adjusting units can be combined together to be positioned at any structural position to realize zooming, and the two groups of lens distance adjusting units can also be respectively positioned at any structural position to realize zooming.

The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like of the present invention shall be included in the protection scope of the present invention.