WO2022089021A1

WO2022089021A1 - Actuator, actuator control method, projection device, and projection device control method

Info

Publication number: WO2022089021A1
Application number: PCT/CN2021/117180
Authority: WO
Inventors: 龚晨晟; 张翠萍; 赵鹏; 陈晨; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-10-29
Filing date: 2021-09-08
Publication date: 2022-05-05
Also published as: CN114430224A

Abstract

An actuator, an actuator control method, a projection device, and a projection device control method, which relate to the technical field of intelligent devices, and can reduce the power consumption of the actuator and increase the Ampere force of the actuator. The actuator (10) comprises an E-type magnetic core (11), a coil (12), a first permanent magnet (13), and a second permanent magnet (14); the E-type magnetic core (11) comprises a first branch arm (111) and a second branch arm (112) which are parallel, and a third branch arm (113) located between the first branch arm (111) and the second branch arm (112); the coil (12) surrounds the third branch arm (113) in a closed shape by taking the third branch arm (113) as a winding center; the first permanent magnet (13) is fixed on the side of the first branch arm (111) close to the coil (12), the second permanent magnet (14) is fixed on the side of the second branch arm (112) close to the coil (12), and the first permanent magnet (13) and the second permanent magnet (14) are not in contact with the coil (12).

Description

Actuator, actuator control method, projection apparatus, and projection apparatus control method

technical field

The present application relates to the technical field of smart devices, and in particular, to an actuator, an actuator control method, a projection device, and a projection device control method.

Background technique

In the projection system, the number of pixels can be increased in space by offsetting and interlacing multiple frames of consecutive images, thereby generating a higher resolution than the original spatial light modulator (Spatial Light Modulator, SLM). This display scheme can be called Extended Pixel Resolution (XPR for short).

XPR relies on an actuator to shift the image. In the prior art, a voice coil motor (Voice Coil Motor, VCM for short) is usually used to periodically drive the glass slide to realize the shift of the image, but the working efficiency of the voice coil motor is too low.

SUMMARY OF THE INVENTION

The objects of the present application include, for example, to provide an actuator, an actuator control method, a projection apparatus and a projection apparatus control method to solve the above problems.

In a first aspect, an actuator is provided, comprising: an E-shaped magnetic core, a coil, a first permanent magnet, and a second permanent magnet. The E-type magnetic core includes a parallel first arm, a second arm, and a third arm located between the first arm and the second arm; the coil is closed with the third arm as the winding center The first permanent magnet is fixed on the side of the first support arm close to the coil, the second permanent magnet is fixed on the side of the second support arm close to the coil, the first permanent magnet and the second permanent magnet are connected to the coil No contact.

In a second aspect, a method for controlling an actuator as described in the first aspect is provided, wherein a current is input to the coil, and the direction of the magnetic field strength of the first magnetic field between the first arm and the coil and the direction of the magnetic field strength of the first magnetic field between the first arm and the coil and the second arm and the coil are controlled. The direction of the magnetic field strength of the second magnetic field is opposite, and the current direction of the coil in the first magnetic field is opposite to the current direction of the coil in the second magnetic field, so that the direction of the first ampere force of the first magnetic field is the same as that of the second magnetic field. The direction of the second ampere force is the same, and the first arm and the second arm move in the same direction under the action of the first ampere force and the second ampere force.

In a third aspect, a projection apparatus is provided, including an actuation structure, a light source, a spatial light modulator, and an optical element. The actuating structure includes at least one actuator according to the first aspect, the actuator is fixedly connected with the optical element, and drives the optical element to move. The light source is arranged on the light incident side of the spatial light modulator to provide illumination light for the spatial light modulator; the optical element and the actuating structure are arranged on the light emitting side of the modulated light of the spatial light modulator, and the modulated light emitted from the spatial light modulator passes through the light source. The optical element exits offset and passes through the actuation structure.

A fourth aspect provides a control method of the projection device as described in the third aspect, which inputs a current to the coil to control the direction of the magnetic field strength of the first magnetic field between the first arm and the coil and the relationship between the second arm and the coil. The direction of the magnetic field strength of the second magnetic field is opposite, and the current direction of the coil in the first magnetic field is opposite to the current direction of the coil in the second magnetic field, so that the direction of the first ampere force of the first magnetic field is the same as that of the second magnetic field. The direction of the two ampere force is the same, and the first arm and the second arm move in the same direction under the action of the first ampere force and the second ampere force, and drive the optical element to move.

In the actuator and the control method thereof, the projection device and the control method thereof provided by the embodiments of the present application, the actuator includes an E-shaped magnetic core, a coil, a first permanent magnet and a second permanent magnet. The E-shaped magnetic core includes a first arm, a second arm and a third arm, and the coil surrounds the third arm. When the actuator works, the first arm and the coil form a first magnetic field, and the magnetic field force received by the current in the first magnetic field is the first ampere force; the second arm and the coil form a second magnetic field, and the current in the second magnetic field The magnetic field force received in is the second ampere force. The direction of the magnetic field strength of the first magnetic field can be controlled to be opposite to that of the second magnetic field, and the current direction of the coil in the first magnetic field can be controlled to be opposite to the current direction of the coil in the second magnetic field, so that the direction of the first ampere force is the same as that of the second magnetic field. The directions of the two ampere forces are the same, and under the action of the resultant force of the first ampere force and the second ampere force, the working efficiency of the actuator can be improved. Compared with the combination solution of the U-shaped magnetic core and the coil, the combination solution of the permanent magnet and the PCB winding, the present application can increase the ampere force generated by the actuator, and at the same time reduce the power consumption of the actuator during operation.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following drawings will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a U-shaped magnetic core and a coil provided by the related art;

Figure 2a is a schematic structural diagram of a permanent magnet and a PCB winding provided by the related art;

Figure 2b is a schematic structural diagram of a permanent magnet and a PCB winding provided by the related art;

3a is a schematic structural diagram of an E-type magnetic core provided by an embodiment of the application;

3b is a schematic structural diagram of an E-type magnetic core provided by an embodiment of the application;

4 is a schematic structural diagram of an actuator provided by an embodiment of the present application;

5 is a schematic side view of an actuator provided by an embodiment of the present application;

FIG. 6 is a magnetic field distribution diagram of an actuator provided by an embodiment of the present application;

FIG. 7 is a graph of the current flowing into the coil provided by the embodiment of the present application;

FIG. 8 is a schematic structural diagram of a projection device provided by an embodiment of the present application;

FIG. 9 is a connection diagram of an actuating structure and an optical element provided by an embodiment of the present application;

10 is a connection diagram of an actuating structure and an optical element provided by an embodiment of the application;

11 is an optical path diagram of display light in an optical element provided by an embodiment of the application;

12 is a positional relationship diagram of each structure in the projection device provided by the embodiment of the application;

FIG. 13a is a diagram of an offset process of a sub-pixel provided by an embodiment of the present application;

FIG. 13b is a diagram of an offset process of a sub-pixel provided by an embodiment of the present application;

FIG. 13c is a diagram of an offset process of a sub-pixel provided by an embodiment of the present application;

FIG. 13d is a diagram of an offset process of a sub-pixel provided by an embodiment of the present application;

FIG. 14a is a diagram of an offset process of a sub-pixel provided by an embodiment of the present application;

FIG. 14b is a diagram of an offset process of a sub-pixel provided by an embodiment of the present application.

Reference number:

10-actuator; 101-first actuator; 102-second actuator; 103-third actuator; 104-fourth actuator; 11-E-type magnetic core; 111-first support arm; 112-second arm; 113-third arm; 12-coil; 13-first permanent magnet; 14-second permanent magnet; 15-PCB; 20-light source; 30-spatial light modulator; 31 -display area; 40-optical element; 41-vibration frame; 50-actuating structure; 51-fixed seat; 52-connector;

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

The related art can use the combination of U-shaped magnetic core and coil (Fig. 1) or the combination of permanent magnet and PCB 15 winding (Fig. 2a and 2b) to drive the image shift, but these two combinations have too low electromagnetic conversion efficiency. problem, which in turn affects the efficiency of image shifting.

After research, the inventor proposes that the E-shaped magnetic core can be used to cooperate with other structures to improve the electromagnetic conversion efficiency, thereby improving the efficiency of image shifting.

As shown in FIG. 3 a and FIG. 3 b , the E-shaped magnetic core 11 includes a parallel first support arm 111 , a second support arm 112 , and a third support arm 113 located between the first support arm 111 and the second support arm 112 . On this basis, the E-shaped magnetic core 11 may further include a support plate 114 , and the first support arm 111 , the second support arm 112 , and the third support arm 113 are all fixed on the support plate 114 .

In some embodiments, as shown in FIGS. 3 a and 3 b , the E-shaped magnetic core 11 may be composed of independent first arms 111 , second arms 112 , and third arms 113 ; or, a first U-shaped magnetic core 11 The magnetic core and the second U-shaped magnetic core are arranged side by side, the first U-shaped magnetic core includes a first sub-arm close to the second U-shaped magnetic core, and the second U-shaped magnetic core includes a second U-shaped magnetic core close to the first U-shaped magnetic core The sub-arm, the first sub-arm and the second sub-arm constitute the third arm 113 of the E-shaped magnetic core 11 , and the other arm of the first U-shaped magnetic core serves as the first arm of the E-shaped magnetic core 11 111 , the other arm of the second U-shaped magnetic core serves as the second arm 112 of the E-shaped magnetic core 11 .

On this basis, as shown in FIG. 4 , an embodiment of the present application provides an actuator 10 . The actuator 10 includes: an E-shaped magnetic core 11 , a coil 12 , a first permanent magnet 13 , and a second permanent magnet 14. The E-shaped magnetic core 11 includes a parallel first arm 111 , a second arm 112 , and a third arm 113 located between the first arm 111 and the second arm 112 . The coil 12 surrounds the third arm 113 in a closed shape with the third arm 113 as the winding center. The first permanent magnet 13 is fixed on the side of the first arm 111 close to the coil 12 , the second permanent magnet 14 is fixed on the side of the second arm 112 close to the coil 12 , the first permanent magnet 13 and the second permanent magnet 14 are connected to the coil 12 . No contact.

In some embodiments, the material of the first permanent magnet 13 and the material of the second permanent magnet 14 may be the same or different.

Exemplarily, the material of the first permanent magnet 13 and the material of the second permanent magnet 14 are both NdFeB magnets. The surface remanence of the NdFeB magnet is 1.25T, and the magnetic induction intensity B generated in the E-type magnetic core is 0.4T.

In some embodiments, the material of the coil 12 is not limited, as long as the material of the coil 12 can conduct electricity.

For example, the material of the coil 12 may be metal, and preferably, the material of the coil 12 is copper.

In some embodiments, the number of turns of the coil 12 around the third arm 113 is related to the resistance of the E-type magnetic core 11 , which in turn is related to the power of the actuator 10 and the ampere force of the actuator 10 when the actuator 10 is working. In this case, set the parameters of the coil 12 reasonably.

In some embodiments, as shown in FIG. 6 , the actuator 10 can be driven to work by inputting a current to the coil 12 . When the actuator 10 is working, the first arm 111 and the coil 12 are formed by the first arm 111 . A magnetic field and a second magnetic field formed by the second arm 112 and the coil 12 . The magnetic field force received by the current in the first magnetic field is the first ampere force, the magnetic field force received by the current in the second magnetic field is the second ampere force, and the actuator 10 can be between the first ampere force and the second ampere force Under the action, the direction of the first ampere force is related to the current direction of the coil 12 in the first magnetic field and the direction of the magnetic field strength of the first magnetic field, and the direction of the second ampere force is related to the current direction of the coil 12 in the second magnetic field and the direction of the first magnetic field. The direction of the magnetic field strength of the two magnetic fields is related.

Wherein, the direction of the magnetic moment of the first permanent magnet 13 and the direction of the magnetic moment of the second permanent magnet 14 can be made opposite, so that the first permanent magnet 13 and the second permanent magnet 14 can generate the direction of the magnetic field strength under the same external conditions. Opposite the first magnetic field and the second magnetic field.

Since the coil 12 is a closed coil, and the first magnetic field and the second magnetic field are symmetrical, the current direction of the coil 12 in the first magnetic field is opposite to the current direction of the coil 12 in the second magnetic field.

The present application can control the direction of the magnetic moment of the first permanent magnet 13 to be opposite to the direction of the magnetic moment of the second permanent magnet 14, and the current direction of the matching coil 12 in the first magnetic field is opposite to the current direction of the coil 12 in the second magnetic field, According to the left-hand rule, it can be obtained that the direction of the first ampere force received by the current in the first magnetic field is the same as the direction of the second ampere force received by the current in the second magnetic field, and the first ampere force and the second ampere force are in the same direction. Superimposed, under the action of the resultant force of the first ampere force and the second ampere force, the first support arm 111 and the second support arm 113 move in the same direction.

In some embodiments, under the action of the combined force of the first ampere force and the second ampere force, the coil 12 and the first permanent magnet 13 and the second permanent magnet 14 move relative to each other, therefore, the first permanent magnet 13 can be made to move relatively. There is no contact between the second permanent magnet 14 and the coil 12 , so as to avoid hindering the relative movement of the coil 12 and the first permanent magnet 13 and the second permanent magnet 14 due to the contact relationship.

Since the combination of the U-shaped magnetic core and the coil 12 in the related art and the combination of the permanent magnet and the winding of the PCB 15 only generate one magnetic field, the actuator 10 of the present application generates two magnetic fields, the first magnetic field and the second magnetic field, The coil 12 can pass currents in opposite directions in the first magnetic field and the second magnetic field with opposite directions of magnetic induction, so that the resultant force of the first ampere force and the second ampere force of the present application is also greater than the combination of the U-shaped magnetic core and the coil 12 and The ampere force generated by the combination of the permanent magnet and the PCB 15 winding, and then compared to the combination of the U-shaped core and the coil 12 and the combination of the permanent magnet and the PCB 15 winding, the application can improve the actuator 10. The generated ampere force is small, and the power consumption of the actuator 10 is reduced at the same time.

Specifically, the number of turns of the coil 12 is N, the current flowing into the coil 12 is I, the total cross-sectional area of the coil 12 is S, the magnetic induction intensity of the magnetic field where the coil 12 is located is B, the length of the uniform magnetic field is L, and the coil 12 The material of the middle wire is the same, and its resistivity is ρ, then the electromagnetic force F _em =NBIL, the resistance of the coil 12 is

Thermal power dissipation in the portion of the coil 12 that is within the magnetic field

That is, when the resistivity of the coil ρ, the magnetic induction intensity B of the magnetic field, the effective length L cut by the coil 12 in the magnetic field, and the total cross-sectional area S of the coil 12 are fixed, the thermal power consumption Q on the coil 12 and the electromagnetic driving force F are The square of _em is proportional.

For the combination of the U-shaped magnetic core and the coil 12 shown in FIG. 1 , assuming that the magnetic induction intensity B of the coil 12 is 0.4T, the total cross-sectional area S of the coil 12 is 3.67×10 ⁻⁹ m ² , and the resistance R of the coil 12 is 12.1 Ω, the voltage of the coil 12 is 1.6V during operation, the geometry of the coil 12 is similar to an elliptical ring column, the outer ring of the elliptical ring column has a long axis length of 8mm, a short axis length of 1.5mm, and the inner ring length of the elliptical ring column. The axial length is 7.4 mm, the short-axis length is 0.9 mm, and the effective length of the coil 12 in the magnetic field is 7.4 mm. Among them, the short-axis length of the inner ring of the ellipse ring can be used as the effective length of the coil 12 to cut, and according to the finite element electromagnetic simulation calculation: the heating power of the coil 12

Electromagnetic driving force

For the combination of permanent magnet and PCB 15 winding shown in Figures 2a and 2b, assuming that the magnetic induction intensity B of the coil 12 is 0.4T, the total cross-sectional area S of the coil 12 is 5.04× ^10-8 m ² , the PCB 15 board There are 8 layers of winding, each layer is wound with 6 turns, the total resistance R of the coil 12 is 4.9Ω, the voltage of the coil 12 is 1.6V during operation, and the effective length L of the coil 12 in the magnetic field is 6.25mm, according to the limited Element electromagnetic simulation calculation: the heating power of the coil 12 Q=I ² R=(100mA) ² ×4.9Ω≈0.05W,

Electromagnetic force

As for the actuator 10 of the present application, as shown in FIG. 5 , assuming that the first permanent magnet 13 and the second permanent magnet 14 are both NdFeB magnets, the surface remanence is 1.25T, and the magnetic field generated in the E-shaped magnetic core The magnetic induction intensity B is 0.4T, the length L1 of the first arm 111 and the second arm 112 are both 8mm, the length L2 of the third arm 113 is 7mm, the cross-sectional width of the coil 12 is W=0.3mm, the coil 12 has a total of There are 78 turns of winding, and the total resistance is 12Ω. As shown in Figure 7, the steady-state currents I1 and I2 are respectively ±70mA, then according to the finite element electromagnetic simulation calculation: heating power Q=I ² R=(70mA) ² × 12Ω= 58.8mW, cross-sectional area of coil 12

Electromagnetic force or ampere force

From the above calculation results, it can be concluded that when the magnetic field strength B is the same, the power consumption of the combination of the U-shaped magnetic core and the coil 12 is 0.21W and the ampere force is 0.026N during operation; the combination of the permanent magnet and the PCB15 winding is in operation. When the power consumption is 0.05W, the ampere force is 0.012N; the power consumption of the actuator 10 of the present application is 0.0588W and the ampere force is 0.026N when working.

Compared with the combination of the U-shaped magnetic core and the coil 12 , the actuator 10 of the present application consumes less power during operation, and generates the same ampere force. Compared with the combination of the permanent magnet and the winding of the PCB 15, the power consumption of the actuator 10 of the present application during operation is almost the same as the power consumption of the combination of the permanent magnet and the winding of the PCB 15, and the generated ampere force is greater. . It can be seen that the actuator 10 of the present application can not only reduce power consumption, but also improve the ampere force.

The embodiment of the present application provides an actuator 10 . The actuator 10 includes an E-shaped magnetic core 11 , a coil 12 , a first permanent magnet 13 and a second permanent magnet 14 . The E-type magnetic core 11 includes a first support arm 111 , a second support arm 112 and a third support arm 113 , and the coil 12 surrounds the third support arm 113 . When the actuator 10 works, the first arm 111 and the coil 12 form a first magnetic field, and the magnetic field force received by the current in the first magnetic field is the first ampere force; the second arm 112 and the coil 12 form a second magnetic field, The magnetic field force experienced by the current in the second magnetic field is the second ampere force. The direction of the magnetic field strength of the first magnetic field can be controlled to be opposite to that of the second magnetic field, and the current direction of the coil 12 in the first magnetic field can be controlled to be opposite to the current direction of the coil in the second magnetic field, so as to make the direction of the first ampere force. The direction of the second ampere force is the same, under the action of the resultant force of the first ampere force and the second ampere force, the working efficiency of the actuator 10 can be improved. Compared with the combination scheme of the U-shaped magnetic core and the coil 12, the combination scheme of the permanent magnet and the PCB 15 winding, the present application can increase the ampere force generated by the actuator 10, and at the same time reduce the work of the actuator 10 when working. consumption.

The embodiments of the present application also provide a method for controlling the actuator 10 as described in the foregoing embodiments, in which a current is input to the coil 12 to control the direction of the magnetic field strength and the first magnetic field between the first support arm 111 and the coil 12 . The direction of the magnetic field strength of the second magnetic field between the two arms 112 and the coil 12 is opposite, and the current direction of the coil 12 in the first magnetic field is opposite to the current direction of the coil 12 in the second magnetic field, so that the first magnetic field of the first magnetic field The direction of the ampere force is the same as the direction of the second ampere force of the second magnetic field, and the first arm 111 and the second arm 112 move in the same direction under the action of the first ampere force and the second ampere force.

The explanations and beneficial effects of the embodiments of the present application are the same as the explanations and beneficial effects of the actuator 10 described in the foregoing embodiments, and will not be repeated here.

As shown in FIG. 8 , an embodiment of the present application further provides a projection device 100 , including an actuating structure 50 , a light source 20 , a spatial light modulator 30 , and an optical element 40 . The actuating structure 50 includes at least one actuator 10 as described in the foregoing embodiments. The actuator 10 is fixedly connected with the optical element 40 to drive the optical element 40 to move.

The light source 20 is arranged on the light incident side of the spatial light modulator 30, and is used to provide illumination light to the spatial light modulator 30; the optical element 40 and the actuating structure 50 are arranged on the light emitting side of the modulated light emitted from the spatial light modulator 30, The modulated light emitted by the spatial light modulator 30 is offset and emitted by the optical element 40 , and passes through the actuating structure 50 .

On this basis, as shown in FIG. 9 and FIG. 10 , the projection apparatus 100 further includes a vibration frame 41 , and the optical element 40 is arranged in the vibration frame 41 . The actuating structure 50 may also include a fixing seat 51 and a connecting member 52 . The actuator 10 is disposed on the fixed base 51 , and the connecting member 52 is used to connect the fixed base 51 and the vibration frame 41 . Among them, FIG. 10 shows the case where the actuating structure 50 includes one actuator 10 .

The fixed base 51 is provided with a static device and a vibration device, the first support arm 111 and the second support arm 112 can be fixed on the vibration device, and the coil 12 can be fixed on the static device. The optical element 40 is fixedly connected with the first support arm and/or the second support arm. Once the first support arm 111 and/or the second support arm 112 moves under the action of Ampere force, the optical element 40 can follow the first support arm 111 and/or the second support arm 112. The arm 111 and/or the second arm 112 moves.

In some embodiments, the spatial light modulator 30 may be a liquid crystal display panel (Liquid Crystal Disp1ay, LCD for short) liquid crystal display panel, or a liquid crystal on silicon display panel (Liquid Crystal on Silicon, abbreviated LCOS), or a digital micromirror device (Digital Micromirror Device, referred to as DMD). When the spatial light modulator 30 is a liquid crystal display panel, the projection apparatus 100 may further include a lower polarizer 31 and an upper polarizer 32 .

In some embodiments, the structure of the optical element 40 is not limited, as long as the modulated light emitted from the spatial light modulator 30 can be shifted through the optical element 40 .

Illustratively, the optical element 40 may be a lens or a transparent plastic with an index of refraction other than one. Taking the optical element 40 as a transparent plastic with a refractive index not equal to 1 as an example, as shown in FIG. 11 , after the light emitted from the spatial light modulator 30 enters the transparent plastic through the air, it is refracted in the transparent plastic, so that the light is refracted in the transparent plastic. offset △y.

In some embodiments, the display light emitted from the spatial light modulator 30 may pass through the optical element 40 and the actuating structure 50 to avoid affecting the display effect of the projection device 100 .

Specifically, as shown in FIG. 12 , taking a transmissive spatial light modulator as an example, the spatial light modulator 30 has a display area 31 . The actuating structure includes a light-transmitting layer 53 , and the orthographic projection of the light-transmitting layer 53 and the optical element 40 on the spatial light modulator 30 covers at least the display area 31 . In this way, the modulated light emitted from the display area 31 of the spatial light modulator 30 can be transmitted through the optical element 40 and the actuating structure 50 for display. For the reflective spatial light modulator, it is sufficient to control the shape of the effective modulated light reflected by the spatial light modulator to match the light-transmitting layer 53 of the above-mentioned actuation structure.

In some embodiments, since the actuator 10 includes an opaque conductive structure such as metal, in order to prevent the actuator 10 from blocking the display light emitted from the optical element 40, the actuator 10 can be modulated with spatial light. The display area 31 of the monitor 30 does not overlap.

In some embodiments, the actuating structure 50 may include one or more actuators 10, and when the actuating structure 50 includes a plurality of actuators 10, the plurality of actuators 10 may drive the first arm 111 and the second The two arms 112 move in one direction, and the plurality of actuators 10 can also drive the first arm 111 and the second arm 112 to move in different directions at different times.

In some embodiments, when the spatial light modulator 30 displays a picture, the actuating structure 50 can be used to drive the vibration frame 41 and the optical element 40 to move. As the optical element 40 moves, the modulated light incident on the optical element 40 may move along with the movement of the optical element 40 , and the direction of the modulated light emitted from the optical element 40 may be shifted.

Taking the spatial light modulator 30 as an example of a liquid crystal display panel, the liquid crystal display panel includes a plurality of sub-pixels. When the liquid crystal display panel displays a frame of pictures, one frame may be divided into a plurality of subframes, and in each subframe, the sub-pixels in the multiple rows of the liquid crystal display panel are all scanned once. That is, one frame of picture is displayed in a time-sharing manner. In the present application, the optical element 40 can be deflected by the actuating structure 50, so that the modulated light emitted from a plurality of sub-pixels in each sub-frame is deflected, and a plurality of consecutive pictures of a plurality of sub-frames in one frame are offset and interlaced with each other, In order to improve the resolution of one frame without increasing the number of sub-pixels in the liquid crystal display panel.

A frame of pictures includes a first subframe, a second subframe, a third subframe, and a fourth subframe, and the actuating structure 50 includes a first actuator, a second actuator, a third actuator, and a fourth actuator. Taking the four actuators 10 such as the actuator as an example, the first actuator, the second actuator, the third actuator, and the fourth actuator are respectively arranged on the four sides of the light-transmitting layer 53 , the upper, lower, left, and right sides. The deflection of light emitted from one sub-pixel in four sub-frames is:

As shown in FIG. 13 a , in the first subframe, as shown in FIG. 9 , the first current is input to the coil 12 of the first actuator 101 disposed on the first side of the light-transmitting layer 53 , and the coil 12 of the first actuator 101 is The first arm 111 and the second arm 112 move in the first direction, and the optical element 40 connected to the actuating structure 50 also moves in the first direction, so that the modulated light emitted from a sub-pixel passes through the optical element 40 and then exits the optical element 40 . The position is also shifted in the first direction. Here, as shown in FIG. 7 , the first current input to the coil 12 of the first actuator may be 100 mA or -100 mA.

As shown in FIG. 13b, in the second subframe, a second current is input to the coil 12 of the second actuator 102 disposed on the second side of the light-transmitting layer 53, and the first arm 111 of the second actuator is and the second arm 112 move in the second direction, and the optical element 40 connected to the actuating structure 50 also moves in the second direction, so that the modulated light emitted from the sub-pixel passes through the optical element 40 and exits to the second direction. Orientation offset. Wherein, the second direction is perpendicular to the first direction. The second current input to the coil 12 of the second actuator may be 100 mA or -100 mA.

As shown in FIG. 13c, in the third subframe, a third current is input to the coil 12 of the third actuator disposed on the third side of the light-transmitting layer 53, the first arm 111 of the third actuator and the second The support arm 112 moves in the third direction, and the optical element 40 connected with the actuating structure 50 also moves in the third direction, and then the modulated light emitted from the sub-pixel passes through the optical element 40 and the output position is also shifted in the third direction. . The third side is opposite to the first side, the third current is opposite to the first current, and the third direction is opposite to the first direction; the vertical connection direction of the first actuator and the third actuator and the third direction parallel. As shown in FIG. 6 , when the first current is 100 mA, the third current is -100 mA; when the first current is -100 mA, the third current is 100 mA.

As shown in FIG. 13d, in the fourth subframe, a fourth current is input to the coil 12 of the fourth actuator disposed on the fourth side of the light-transmitting layer 53, the first arm 111 of the fourth actuator and the second The support arm 112 moves in the fourth direction, and the optical element 40 connected to the actuating structure 50 also moves in the fourth direction, so that the modulated light emitted from the sub-pixel passes through the optical element 40 and the output position is also shifted to the fourth direction. . Wherein, the fourth current is opposite to the second current, and the fourth direction is opposite to the second direction. When the second current is 100mA, the fourth current is -100mA; when the second current is -100mA, the fourth current is 100mA.

The pictures displayed in the above four sub-frames can constitute one frame of pictures, and the resolution of the projection device 100 can be increased to four times that of the prior art. Before displaying the next frame, the steady-state current may be continuously input to the coil 12 of the actuator 10, and the steady-state current may be ±70mA.

In the above four stages, the direction of the first current is opposite to the direction of the third current, the magnitude of the first current and the magnitude of the third current may be the same or different; the direction of the second current is opposite to the direction of the fourth current , the magnitude of the second current and the magnitude of the fourth current may be the same or different.

Taking a frame of pictures including a first subframe and a second subframe, and the actuating structure 50 including two actuators 10, such as a first actuator and a second actuator, for example, the first actuator and the second actuator The actuators are arranged on opposite sides of the light-transmitting layer 53 along the diagonal of the light-transmitting layer 53, and the deflection of the light emitted from one sub-pixel in two sub-frames is:

As shown in FIG. 14a, in the first subframe, the first current is input to the coil 12 of the first actuator disposed on the first side of the light-transmitting layer 53, the first arm 111 of the first actuator and the second The support arm 112 moves in the first direction, and the optical element 40 connected to the actuating structure 50 also moves in the first direction, so that the modulated light emitted from the sub-pixel passes through the optical element 40 and the output position also shifts to the first direction . Wherein, the first current input to the coil 12 of the first actuator may be 100 mA or -100 mA.

As shown in FIG. 12b, in the second subframe, a second current is input to the coil 12 of the second actuator disposed on the second side of the light-transmitting layer 53, the first arm 111 of the second actuator and the second The support arm 112 moves in the second direction, and the optical element 40 connected to the actuating structure 50 also moves in the second direction, so that the modulated light emitted from the sub-pixel passes through the optical element 40 and the output position is also shifted to the second direction. . Wherein, the first and second currents have opposite directions, the first and second directions are both parallel to the diagonal connection direction from the first actuator to the second actuator, and the second direction is opposite to the first direction. When the first current is 100mA, the second current is -100mA; when the first current is -100mA, the second current is 100mA.

The pictures displayed by the above two sub-frames may constitute one frame of pictures, and the resolution of the projection device 100 may be increased to twice that of the prior art. Before displaying the next frame, the steady-state current may be continuously input to the coil 12 of the actuator 10, and the steady-state current may be ±70mA.

In the above two stages, the direction of the first current is opposite to the direction of the second current, and the magnitude of the first current and the magnitude of the second current may be the same or different.

An embodiment of the present invention provides a projection device 100 , the projection device 100 includes a light source 20 , a spatial light modulator 30 , an optical element 40 , and an actuation structure 50 including at least one actuator 10 . When the actuator 10 is working, the first arm 111 and the coil 12 form a first magnetic field, and the magnetic field force received by the current in the first magnetic field is the first ampere force; the second arm 112 and the coil 12 form a second magnetic field, and the current The magnetic field force experienced in the second magnetic field is the second ampere force. Under the action of the resultant force of the first ampere force and the second ampere force, the actuator 10 can move in the direction of the resultant force, and the optical element 40 can move with the movement of the actuator 10 , and then emits light from the spatial light modulator 20 The display light emitted through the optical element 40 also shifts with the actuator 10 . In this way, one frame of picture can be composed of pictures displayed by multiple sub-frames, and the resolution of the projection device 100 can be improved compared with the prior art. On this basis, the direction of the magnetic field strength of the first magnetic field can be controlled to be opposite to that of the second magnetic field, and the direction of the current from the coil 12 to the first arm 111 can be controlled to be opposite to the direction of the current from the coil 12 to the second arm 112 , so that the direction of the first ampere force is the same as the direction of the second ampere force, under the action of the first ampere force and the second ampere force, the working efficiency of the actuator 10 can be improved. Compared with the combination scheme of the U-shaped magnetic core and the coil 12, the combination scheme of the permanent magnet and the PCB 15 winding, the present application can increase the ampere force generated by the actuator 10, and at the same time reduce the work of the actuator 10 when working. consumption.

The embodiments of the present application further provide a method for controlling the projection device 100 as described in the foregoing embodiments, in which a current is input to the coil 12 to control the direction of the magnetic field strength of the first magnetic field and the second magnetic field between the first arm 111 and the coil 12 . The direction of the magnetic field strength of the second magnetic field between the arm 112 and the coil 12 is opposite, and the current direction of the coil 12 in the first magnetic field is opposite to the current direction of the coil 12 in the second magnetic field, so that the first ampere of the first magnetic field is opposite. The direction of the force is the same as the direction of the second ampere force of the second magnetic field, the first arm 111 and the second arm 112 move in the same direction under the action of the first ampere force and the second ampere force, and drive the optical element 40 to move .

The explanations and beneficial effects of the embodiments of the present application are the same as the explanations and beneficial effects of the projection apparatus 100 described in the foregoing embodiments, and will not be repeated here.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or some technical features thereof are equivalently replaced; and these modifications or replacements do not drive the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions in the embodiments of the present application.

Claims

An actuator, characterized by comprising: an E-shaped magnetic core, a coil, a first permanent magnet, and a second permanent magnet;

The E-shaped magnetic core includes a parallel first support arm, a second support arm, and a third support arm located between the first support arm and the second support arm;

The coil surrounds the third support arm in a closed shape with the third support arm as the winding center;

The first permanent magnet is fixed on the side of the first arm close to the coil, the second permanent magnet is fixed on the side of the second arm close to the coil, the first permanent magnet and the The second permanent magnet is not in contact with the coil.
The actuator according to claim 1, wherein the third support arm comprises a first sub-support arm and a second sub-support arm arranged side by side; the first sub-support arm and the first support arm The arm constitutes a part of the first U-shaped magnetic core, and the second sub-arm and the second supporting arm constitute a part of the second U-shaped magnetic core.
The actuator of claim 1, wherein the direction of the magnetic moment of the first permanent magnet is opposite to the direction of the magnetic moment of the second permanent magnet.
The actuator according to any one of claims 1-3, wherein the material of the first permanent magnet and the second permanent magnet comprises NdFeB magnets.
A method for controlling an actuator according to any one of claims 1 to 4, wherein a current is input to the coil to control the direction of the magnetic field strength of the first magnetic field between the first arm and the coil and the direction of the second magnetic field. The direction of the magnetic field strength of the second magnetic field between the arm and the coil is opposite, and the current direction of the coil in the first magnetic field is opposite to the current direction of the coil in the second magnetic field, so that all the The direction of the first ampere force of the first magnetic field is the same as the direction of the second ampere force of the second magnetic field, and the first arm and the second arm are in the first ampere force and the second ampere force. Motion in the same direction under the action of a two-ampere force.
A projection device, characterized by comprising an actuating structure, a light source, a spatial light modulator, and an optical element;

The actuating structure includes at least one actuator according to any one of claims 1-4, the actuator is fixedly connected with the optical element, and drives the optical element to move;

The light source is arranged on the light incident side of the spatial light modulator, and is used to provide illumination light to the spatial light modulator; the optical element and the actuating structure are arranged on the modulation output of the spatial light modulator On the light-emitting side of the light, the modulated light emitted from the spatial light modulator is shifted and emitted by the optical element, and passes through the actuating structure.
The projection apparatus according to claim 6, wherein the spatial light modulator has a display area; the actuating structure further comprises a light-transmitting layer, and the light-transmitting layer and the optical element are in the spatial light The orthographic projection on the modulator covers at least the display area.
The projection apparatus according to claim 7, wherein the actuators are disposed on four sides of the edge of the light-transmitting layer, and the actuators do not overlap with the display area;

Alternatively, the actuators are disposed on opposite sides of the light-transmitting layer along a diagonal line of the light-transmitting layer, and the actuators do not overlap with the display area.
The projection device according to any one of claims 6-8, wherein the actuating structure further comprises a static device and a vibration device; the first support arm and the second support arm are fixed on the vibration On the device, the coil is fixed on the stationary device, and the optical element is fixedly connected with the first arm and/or the second arm.
The projection device according to any one of claims 6-8, wherein the material of the optical element comprises transparent plastic, and the refractive index of the transparent plastic is not equal to 1.
A method for controlling a projection device as claimed in any one of claims 6-10, wherein a current is input to the coil to control the direction of the magnetic field strength of the first magnetic field between the first arm and the coil and the direction of the second arm The direction of the magnetic field strength of the second magnetic field between the arm and the coil is opposite, and the direction of the current of the coil in the first magnetic field is opposite to the direction of the current of the coil in the second magnetic field, so that the direction of the current of the coil in the second magnetic field is opposite The direction of the first ampere force of the first magnetic field is the same as the direction of the second ampere force of the second magnetic field, and the first arm and the second arm are in the same direction as the first ampere force and the second ampere force. Under the action of the ampere force, it moves in the same direction and drives the optical element to move.
The control method according to claim 11, wherein the actuators are arranged on four sides of the light-transmitting layer, the spatial light controller displays a frame of pictures in a time-sharing manner, and a frame of pictures includes a first sub-frame and a second sub-frame. frame, a third subframe, and a fourth subframe;

In the first subframe, the first current is input to the coil of the first actuator disposed on the first side of the light-transmitting layer, and the first arm and the second arm of the first actuator are along the first directional movement;

In the second subframe, a second current is input to the coil of the second actuator disposed on the second side of the light-transmitting layer, and the first arm and the second arm of the second actuator are along the second direction movement; the second direction is perpendicular to the first direction;

In the third subframe, a third current is input to the coil of the third actuator disposed on the third side of the light-transmitting layer, and the first arm and the second arm of the third actuator are along the third direction movement; the third side is opposite the first side, the third current is opposite to the first current, the third direction is opposite the first direction; the first actuator parallel to the vertical connection direction of the third actuator and the third direction;

In the fourth subframe, a fourth current is input to the coil of the fourth actuator disposed on the fourth side of the light-transmitting layer, and the first arm and the second arm of the fourth actuator are along the fourth direction movement; the fourth current is opposite to the second current, and the fourth direction is opposite to the second direction.
The control method according to claim 11, wherein the actuators are disposed on opposite sides of the light-transmitting layer along a diagonal line of the light-transmitting layer; the spatial light controller displays a time-sharing display A frame picture, a frame picture includes a first subframe and a second subframe;

In the first subframe, the first current is input to the coil of the first actuator disposed on the first side of the light-transmitting layer, and the first arm and the second arm of the first actuator are along the first directional movement;

In the second subframe, a second current is input to the coil of the second actuator disposed on the second side of the light-transmitting layer, and the first arm and the second arm of the second actuator are along the Movement in the second direction; the first current and the second current are in opposite directions, the second direction is opposite to the first direction, the diagonal angle between the first actuator and the second actuator The connection direction is parallel to the second direction.