CN116893526B

CN116893526B - Holographic projection display device

Info

Publication number: CN116893526B
Application number: CN202311156011.4A
Authority: CN
Inventors: 段安康; 杨得水; 张明生; 胡俏成; 黄思健
Original assignee: Lizhen Precision Intelligent Manufacturing Kunshan Co ltd
Current assignee: Lizhen Precision Intelligent Manufacturing Kunshan Co ltd
Priority date: 2023-09-08
Filing date: 2023-09-08
Publication date: 2024-01-23
Anticipated expiration: 2043-09-08
Also published as: CN116893526A

Abstract

The invention discloses a holographic projection display device, which belongs to the technical field of projection and comprises a box body, a supporting platform, a magnetic suspension device and a projection lens. The top end of the box body is opened; the supporting platform is connected with the box body in a sliding manner and can move into the box body through the opening; the magnetic suspension device comprises a magnetic suspension fixing assembly and a suspension piece, wherein the magnetic suspension fixing assembly is arranged on the supporting platform, the suspension piece interacts with the magnetic suspension fixing assembly so as to enable the suspension piece to suspend above the magnetic suspension fixing assembly, and the vertical distance between the suspension piece and the magnetic suspension fixing assembly can be adjusted by adjusting the current input to the magnetic suspension fixing assembly; and the projection lens is connected with the suspension piece, and at least part of the projection lens can move into the box body. The holographic projection display device provided by the invention has higher universality and better projection effect.

Description

Holographic projection display device

Technical Field

The invention relates to the technical field of projection, in particular to a holographic projection display device.

Background

Holographic projection technology, also known as virtual imaging technology, is a technology that uses the principles of interference and diffraction to record and reproduce a true three-dimensional image of an object.

Principle of holographic projection technology: the first step is to record the object light wave information by utilizing the interference principle, namely the shooting process: the shot object forms a diffuse object beam under laser irradiation; the other part of laser is used as reference beam to be emitted onto the holographic negative film, and is overlapped with the object beam to generate interference, so that the phase and amplitude of each point on the object light wave are converted into the intensity which is changed in space, and the whole information of the object light wave is recorded by utilizing the contrast and interval between interference fringes. The negative film recorded with the interference fringes is processed by developing, fixing and other processing procedures to form a hologram or called hologram; the second step is to reproduce the information of the object light wave by utilizing the diffraction principle, which is an imaging process, and the hologram is like a complex grating, and under the irradiation of coherent laser, the diffraction light wave of a linearly recorded sinusoidal hologram can generally give two images, namely an original image (also called initial image) and a conjugate image. The reproduced image has strong stereoscopic impression and real visual effect. Each part of the hologram records the light information of each point on the object, so that in principle, each part of the hologram can reproduce the whole image of the original object, and a plurality of different images can be recorded on the same negative film through multiple exposure and can be displayed respectively without interference.

In the holographic projector in the prior art, the projection lens is supported on the top surface of the box body through the support, so that the distance between the projection lens and the top surface of the box body is a certain value, and when the distance between the projection lens and the top surface of the box body needs to be adjusted, the supports with different heights need to be designed, so that the universality of the holographic projector is lower.

Disclosure of Invention

The invention aims to provide a holographic projection display device which has higher universality and better projection effect.

The technical scheme adopted by the invention is as follows:

a holographic projection display device comprising:

the box body is provided with an opening at the top end;

the supporting platform is connected to the box body in a sliding manner and can move into the box body through the opening;

the magnetic suspension device comprises a magnetic suspension fixing assembly and a suspension piece, wherein the magnetic suspension fixing assembly is arranged on the supporting platform, the suspension piece and the magnetic suspension fixing assembly interact to enable the suspension piece to suspend above the magnetic suspension fixing assembly, and the vertical distance between the suspension piece and the magnetic suspension fixing assembly can be adjusted by adjusting the current input to the magnetic suspension fixing assembly;

a projection lens connected to the suspension;

the magnetic motor is connected with the supporting platform;

the guide rail is arranged on the inner wall of the box body and extends along the height direction of the box body, and the guide rail is configured for sliding connection of the magnetic motor.

Optionally, the magnetic suspension fixing assembly comprises a magnetic suspension base, a first magnet and a magnetic suspension coil, wherein the magnetic suspension base is connected to the bottom surface of the supporting platform, the first magnet and the magnetic suspension coil are respectively arranged on the magnetic suspension base and are located between the magnetic suspension base and the supporting platform, and the suspension piece comprises a second magnet.

Optionally, the magnetic suspension coil array has been arranged a plurality ofly, and first magnet is equipped with a plurality ofly, and a plurality of first magnet interval sets up and around the periphery at a plurality of magnetic suspension coils.

Optionally, the magnetic force motor comprises a motor rotor and a motor stator, the motor stator is arranged on the guide rail, the motor stator can interact with the motor rotor so that the motor rotor slides on the guide rail, and the supporting platform is connected with the motor rotor.

Optionally, the guide rail is provided with a chute, the motor stator is arranged in the chute, and at least part of the motor rotor is positioned in the chute.

Optionally, the motor stator includes a plurality of third magnets and a plurality of fourth magnets, the third magnets and the fourth magnets have opposite magnetism, and the third magnets and the fourth magnets are alternately arranged on at least one of the two opposite side walls of the guide rail along the height direction of the box body.

Optionally, the two opposite side walls of the guide rail are a first side wall and a second side wall respectively, the first side wall and the second side wall are provided with a third magnet and a fourth magnet respectively, and the third magnet on the first side wall and the fourth magnet on the second side wall are oppositely arranged in the direction that the first side wall points to the second side wall.

Optionally, guide rail and magnetic motor correspond and are equipped with a plurality ofly, and a plurality of guide rails set up along the circumference interval of box, and the motor active cell of every magnetic motor all is connected in supporting platform.

Optionally, the support platform has a first avoidance port that avoids the guide rail; or alternatively

The supporting platform is provided with a first avoiding opening for avoiding the guide rail, and a first electrostatic brush is fully distributed in the first avoiding opening.

Optionally, the inner wall of box is provided with limit structure, limit structure be used for with supporting platform contact, be used for spacing supporting platform in the position of box, distance between limit structure and the box top is greater than or equal to the distance between supporting platform's bottom surface and the top of projection lens, distance between limit structure and the box bottom is greater than the height of magnetic suspension fixed subassembly.

Optionally, the device further comprises an electrostatic fan, the side wall of the box body is provided with a wind hole, the electrostatic fan is installed on the inner wall of the box body and opposite to the wind hole, the electrostatic fan is used for reducing the temperature in the box body, and/or the electrostatic fan is used for removing dust from the projection lens located in the box body.

Optionally, the supporting platform is provided with a second avoidance port for avoiding the electrostatic fan; or alternatively

The supporting platform is provided with a second avoiding opening for avoiding the electrostatic fan, and a second electrostatic brush is fully distributed in the second avoiding opening.

Optionally, the projection lens is hollow and in an inverted prismatic table shape, and the suspension piece completely covers the bottom of the projection lens.

Optionally, the box cover is further provided with a box cover, and the box cover can be connected to the box body and can seal the opening at the top end of the box body.

Optionally, the leveling device further comprises a plurality of leveling pieces, wherein the leveling pieces are respectively arranged at the bottom of the box body and used for leveling the box body.

The invention has the beneficial effects that:

the holographic projection display device provided by the invention comprises the magnetic suspension fixing component and the suspension piece, wherein the magnetic suspension fixing component is arranged on the supporting platform, the suspension piece is connected with the projection lens, the vertical distance between the magnetic suspension fixing component and the suspension piece is adjustable, the vertical distance between the projection lens and the supporting platform is further adjustable, the brackets with different heights do not need to be frequently replaced, the holographic projection display device can be suitable for the requirements of different distances, the imaging quality is further improved, the projection deviation of the projection lens is compensated, the visual experience effect is ensured, and the universality of the holographic projection display device is improved.

Drawings

FIG. 1 is a schematic diagram of a holographic projection display according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a holographic projection display according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an exploded structure of a holographic projection display device according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a holographic projection display device without a case according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating assembly of a magnetic levitation device and a projection lens according to an embodiment of the present invention;

FIG. 6 is an exploded view of a projection lens and suspension provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram illustrating assembly of a guide rail and a magnetic motor according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a case according to an embodiment of the present invention;

FIG. 9 is a schematic structural view of a support platform according to an embodiment of the present invention;

FIG. 10 is a schematic view of a first electrostatic brush according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a magnetic levitation device and a projection lens according to an embodiment of the present invention when the magnetic levitation device and the projection lens are located in a case.

In the figure:

1. a case; 11. an opening; 12. a limit structure; 13. a wind hole; 2. a support platform; 21. a first avoidance port; 22. a first electrostatic brush; 221. a frame; 222. brushing; 23. a second avoidance port; 24. a second electrostatic brush; 25. a positioning groove; 3. a magnetic levitation device; 31. a magnetic suspension fixing assembly; 311. a magnetic suspension base; 312. a first magnet; 313. a magnetic levitation coil; 32. a suspension; 321. a second magnet; 4. a projection lens; 5. a magnetic motor; 51. a motor rotor; 52. a motor stator; 521. a third magnet; 522. a fourth magnet; 6. a guide rail; 61. a chute; 62. a first sidewall; 63. a second sidewall; 7. an electrostatic fan; 8. a case cover; 9. a horizontal adjustment member; 10. a stop bolt; 20. a data exchange port.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the invention more clear, the technical scheme of the invention is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between the two components or interaction relationship between the two components. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or component in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The embodiment provides a holographic projection display device, which has higher universality and better projection effect.

As shown in fig. 1 to 3, the holographic projection display device includes a case 1, a support platform 2, a magnetic levitation device 3, and a projection lens 4.

Wherein the top end of the case 1 is open 11. The shape of the case 1 may be a square or rectangular shape according to the shape of the projection lens 4, and in this embodiment, the case 1 is a square or rectangular parallelepiped.

The opening 11 at the top end of the case 1 may be the opening 11 on the entire top surface of the case 1, or the portion of the top surface of the case 1 may be the opening 11, which is not limited in this embodiment.

The supporting platform 2 is slidably connected to the case 1, and the supporting platform 2 is located at the top of the case 1 when the holographic projection display device is in use, and moves into the case 1 through the opening 11 at the top of the case 1 when needed. In this embodiment, the supporting platform 2 is used for supporting the projection device, as shown in fig. 9, the top surface of the supporting platform 2 has a plurality of positioning slots 25, and the positioning slots 25 can be used for placing the projection device. The projection device may employ a lens or a normal display for projection. In this embodiment, the ipad projection may be selected, for example, the support platform 2 may be provided with an ipad tray, or ipad may be placed in the positioning slot 25. Since the projection apparatus, the projection principle, and the like are not the emphasis in the present embodiment, no specific limitation is made here.

The magnetic levitation device 3 in this embodiment includes a magnetic levitation fixing assembly 31 and a levitation member 32. Wherein, the magnetic suspension fixing component 31 is disposed on the supporting platform 2, that is, the magnetic suspension fixing component 31 can move along with the supporting platform 2, the suspension member 32 can interact with the magnetic suspension fixing component 31, so that the suspension member 32 is suspended above the magnetic suspension fixing component 31, in this embodiment, the interaction principle between the suspension member 32 and the magnetic suspension fixing component 31, that is, the principle of magnetic suspension, can be referred to in the prior art, and this embodiment will not be described herein. It should be noted that, by adjusting the magnitude of the current input to the magnetic levitation fixing assembly 31, the vertical distance between the levitation member 32 and the magnetic levitation fixing assembly 31 can be adjusted, so as to adjust the distance between the levitation member 32 and the support platform 2. It should be noted that, the vertical distance between the suspension member 32 and the magnetic suspension fixing assembly 31 may be the distance between the suspension member and the magnetic suspension fixing assembly 31 in the height direction of the case 1 or the direction perpendicular to the supporting platform 2. The projection lens 4 is connected to the suspension 32, so that the distance between the projection lens 4 and the supporting platform 2 is adjusted, the requirements of different distances can be met, the imaging quality is improved, the projection deviation of the projection lens 4 is compensated, and the visual experience effect is guaranteed.

In this embodiment, at least part of the projection lens 4 can move into the case 1, so as to protect the projection lens 4 from dust and scratch by the case 1 and prevent the projection lens 4 from being scratched.

The holographic projection display device that this embodiment provided, magnetic suspension device 3 includes magnetic suspension fixed subassembly 31 and suspension piece 32, and magnetic suspension fixed subassembly 31 sets up on supporting platform 2, suspension piece 32 is connected in projection lens 4, vertical distance between magnetic suspension fixed subassembly 31 and the suspension piece 32 is adjustable, and then vertical distance between projection lens 4 and supporting platform 2 is adjustable, need not frequently to change the support of different height, can be applicable to the demand of different distances, and then improves imaging quality, compensates the projection deviation of projection lens 4, guarantees visual experience effect, has improved holographic projection display device's commonality.

Optionally, this embodiment provides a specific structure of the magnetic suspension fixing assembly 31, as shown in fig. 4 and 5, the magnetic suspension fixing assembly 31 includes a magnetic suspension base 311, a first magnet 312, and a magnetic suspension coil 313. Wherein, the magnetic levitation base 311 is connected to the bottom surface of the support platform 2, and in some embodiments, the magnetic levitation base 311 is connected to the bottom surface of the support platform 2 through a plurality of bolts. The first magnet 312 and the magnetic levitation coil 313 are respectively arranged on the magnetic levitation base 311, and the first magnet 312 and the magnetic levitation coil 313 are both positioned between the magnetic levitation base 311 and the supporting platform 2, so that the space in the box body 1 can be fully utilized, the space at the top of the supporting platform 2 can not be occupied, and interference or shielding of projection equipment can be avoided.

As shown in fig. 6, the suspension 32 in the present embodiment includes a second magnet 321. The first magnet 312 and the second magnet 321 in this embodiment may be rubidium magnets, and are not limited thereto. In this embodiment, the second magnet 321 is fixed to the bottom of the projection lens 4 by colorless strong adhesive.

Further alternatively, as shown in fig. 5, a plurality of magnetic levitation coils 313 are arranged in an array, in this embodiment, four magnetic levitation coils 313 are arranged in two rows and two columns. The first magnets 312 are provided with a plurality of first magnets 312, and the plurality of first magnets 312 are arranged at intervals and surround the outer circumferences of the plurality of magnetic levitation coils 313, so that a relatively uniform magnetic field can be generated, and the levitation stability and the levitation reliability of the levitation member 32 are further ensured. A gap exists between the magnetic levitation coil 313 and the first magnet 312.

Illustratively, the first magnets 312 in the present embodiment are cylindrical, and the axes of the first magnets 312 are parallel to the axes of the magnetic levitation coils 313 and each extend in a direction perpendicular to the support platform 2. The height of the first magnet 312 and the height of the magnetic levitation coil 313 may be equal, and the top surface of the first magnet 312 and the top surface of the magnetic levitation coil 313 may contact the support platform 2, so as to improve the fixing stability of the first magnet 312 and the magnetic levitation coil 313.

Optionally, referring to fig. 4 and 7, the holographic projection display further includes a magnetic motor 5 and a guide rail 6. Wherein the guide rail 6 is provided on the inner wall of the case 1 and extends in the height direction of the case 1. The magnetic motor 5 comprises a motor rotor 51 and a motor stator 52, the motor stator 52 is arranged on the guide rail 6, the motor stator 52 can interact with the motor rotor 51 to enable the motor rotor 51 to slide on the guide rail 6, namely to move up and down along the guide rail 6, and the supporting platform 2 is connected with the motor rotor 51, so that the supporting platform 2 is connected with the box body 1 in a sliding manner through the magnetic motor 5 and the guide rail 6. Through setting up magnetic motor 5, realized the rising and the decline of supporting platform 2, have characteristics such as simple operation, precision height and maneuverability are strong. The working principle of the magnetic motor 5 can be seen in the prior art, and the present embodiment is not limited herein.

In some alternative embodiments, as shown in fig. 7, the guide rail 6 has a slide groove 61, specifically, a side surface of the guide rail 6 has the slide groove 61, the motor stator 52 is disposed in the slide groove 61, and at least part of the motor mover 51 is disposed in the slide groove 61. Through setting up spout 61, be convenient for fix motor stator 52, still be convenient for spacing motor rotor 51, improve the reliability of magnetic force motor 5 work. Illustratively, the cross section of the motor mover 51 is T-shaped, with the protruding end located in the chute 61.

Alternatively, as shown in fig. 7, the motor stator 52 includes a plurality of third magnets 521 and a plurality of fourth magnets 522. The third magnet 521 and the fourth magnet 522 are alternately provided on at least one of the two opposite side walls of the guide rail 6 along the height direction of the casing 1, that is, the plurality of third magnets 521 and the plurality of fourth magnets 522 on one side wall of the guide rail 6 are alternately provided in order to drive the motor mover 51. The motor mover 51 has a motor coil that interacts with the third magnet 521 and the fourth magnet 522, and an external power source can supply power to the motor coil. In the present embodiment, the third magnet 521 and the fourth magnet 522 are respectively located in the slide groove 61.

Illustratively, as shown in fig. 4, two opposite side walls of the guide rail 6 are a first side wall 62 and a second side wall 63, and as shown in fig. 7, a plurality of third magnets 521 and a plurality of fourth magnets 522 are respectively provided on the first side wall 62 and the second side wall 63. In the direction that the first side wall 62 points to the second side wall 63, the third magnet 521 on the first side wall 62 is opposite to the fourth magnet 522 on the second side wall 63, the fourth magnet 522 on the first side wall 62 is opposite to the third magnet 521 on the second side wall 63, the sizes and shapes of the third magnet 521 and the fourth magnet 522 are the same, and the orthographic projections of the third magnet 521 and the opposite fourth magnet 522 on the first side wall 62 are overlapped so as to generate a relatively uniform magnetic field, and the moving stability of the driving motor mover 51 is improved on the basis of ensuring the driving of a normal driving motor.

Please continue to see fig. 4, guide rail 6 and magnetic motor 5 correspond and are equipped with a plurality ofly, and a plurality of guide rails 6 set up along the circumference interval of box 1, and the motor active cell 51 of every magnetic motor 5 all is connected in supporting platform 2 to can support supporting platform 2 in different regions, guarantee supporting platform 2's translation, reduce supporting platform 2's the probability that appears the slope at the in-process that removes. In this embodiment, the supporting platform 2 is square plate-shaped, the guide rail 6 and the magnetic motor 5 are respectively provided with four, and the four motor movers 51 are connected with the four ends of the supporting platform 2.

Optionally, referring to fig. 8, the inner wall of the case 1 is further provided with a limiting structure 12, the limiting structure 12 is used for contacting with the supporting platform 2, and is used for limiting the position of the supporting platform 2 in the case 1, so that the supporting platform 2 can be located at a required position, and the distance between the limiting structure 12 and the top of the case 1 is greater than or equal to the distance between the bottom surface of the supporting platform 2 and the top of the projection lens 4, so that the projection lens 4 can be just completely located in the case 1 when the supporting platform 2 contacts with the limiting structure 12, so as to facilitate the storage of the projection lens 4. The limiting structure 12 is arranged, so that when the supporting platform 2 is positioned in the box body 1, the supporting platform can be supported through the limiting structure 12 without the need of limiting the position through the magnetic motor 5, and at the moment, the magnetic motor 5 can be powered off, thereby being beneficial to energy conservation of the holographic projection display device; and, the distance between limit structure 12 and the bottom of box 1 is greater than the height of magnetic suspension fixed subassembly 31 to prevent the hard contact between the diapire of magnetic suspension fixed subassembly 31 and box 1, and then avoid damaging magnetic suspension fixed subassembly 31, that is, limit structure 12's setting, make to have the space between the diapire of supporting platform 2 and box 1, so that the holding magnetic suspension fixed subassembly 31.

Optionally, a plurality of limiting structures 12 are provided, and a plurality of limiting structures 12 may be provided at corners of the case 1 to support a plurality of corners of the support platform 2.

In some alternative embodiments, the support platform 2 has a first relief opening 21 that vents the rail 6 to avoid interference between the support platform 2 and the rail 6. The portion of the supporting platform 2 excluding the first avoiding opening 21 may be in contact with the inner wall of the case 1 or the gap may be small, so that the supporting platform 2 may substantially block the opening 11 when the holographic projection display device is in use, thereby preventing dust or sundries from falling into the case 1.

In other alternative embodiments, as shown in fig. 9, the supporting platform 2 is provided with a first avoiding opening 21 for avoiding the guide rail 6, the first avoiding opening 21 is fully covered with a first electrostatic brush 22, and when the supporting platform 2 is positioned at the opening 11, the first electrostatic brush 22 can block the first avoiding opening 21 so as to prevent dust or sundries from falling into the box 1 through the first avoiding opening 21; in the descending process of the supporting platform 2, the first electrostatic brush 22 can be pulled out by the guide rail 6 and is elastically deformed, so that the passing area of the first avoiding opening 21 is further reduced. The first electrostatic brush 22 in the present embodiment has an antistatic function to prevent static electricity from being generated when it contacts the guide rail 6. When the guide rail 6 is provided in plural, the first escape openings 21 are provided in plural correspondingly.

Further, as shown in fig. 10, the first electrostatic brush 22 includes a U-shaped frame 221 and bristles 222 mounted on the frame 221, the frame 221 is connected with the supporting platform 2, and the length direction of the bristles 222 is perpendicular to the inner wall of the box 1 where the guide rail 6 where the bristles are located, so as to avoid the guide rail 6. The bristles 222 in this embodiment have an antistatic function.

Optionally, as shown in fig. 3 and 4, the holographic projection display device further comprises an electrostatic fan 7. As shown in fig. 11, the side wall of the case 1 has a plurality of air holes 13, and the shape of the air holes 13 may be circular, polygonal, or the like, which is not limited in this embodiment. The electrostatic fan 7 is installed at the inner wall of the case 1 and opposite to the wind hole 13 to be capable of sucking or exhausting air through the wind hole 13. The electrostatic fan 7 is used for reducing the temperature in the case 1 to prevent static electricity in the case 1, and the electrostatic fan 7 is also used for removing dust from the projection lens 4 in the case 1 when the projection lens 4 is in the case 1 to keep the projection lens 4 clean.

For example, the electrostatic fans 7 in the present embodiment may be provided with two, opposite side walls of the case 1 having the wind holes 13, respectively, one electrostatic fan 7 being mounted on one side wall of the case 1 having the wind holes 13, the other electrostatic fan 7 being mounted on the other side wall of the case 1 having the wind holes 13, one electrostatic fan 7 of the two electrostatic fans 7 being used to pour air into the case 1 and the other being used to output air from the inside of the case 1 to the outside, or both electrostatic fans 7 being used to output air from the inside of the case 1 to the outside.

Further alternatively, as shown in fig. 9, the supporting platform 2 has a second avoidance opening 23 for avoiding the electrostatic fan 7, so as to avoid the mutual interference between the electrostatic fan 7 and the supporting platform 2. The second avoiding opening 23 may be fully covered with a second electrostatic brush 24, so as to reduce dust, impurities and the like entering the box 1 through the second avoiding opening 23 on the basis of avoiding the electrostatic fan 7. The specific structure of the second electrostatic brush 24 can refer to the first electrostatic brush 22, and the description of this embodiment is omitted here. It should be understood that the second bypass hole may not be fully covered with the second electrostatic brush 24, which is not limited in this embodiment. When the electrostatic fans 7 are provided with two, the second avoiding openings 23 are correspondingly provided with two.

The projection lens 4 in this embodiment is a hollow structure and has an inverted prismatic table shape, so as to have a better projection effect, and as shown in fig. 6, for example, the projection lens 4 has an equal four-sided cone structure, and is made of glass, specifically, a glass integrally formed structure. In addition, the suspension 32 in the present embodiment completely covers the bottom of the projection lens 4, so that the two have a larger contact area and thus have higher connection strength.

Fig. 11 is a state of the supporting platform 2 and the projection lens 4 provided in this embodiment when the supporting platform is located in the case 1, as shown in fig. 11, the holographic projection display device further includes a case cover 8, where the case cover 8 can be connected to the case 1, and seals the opening 11 at the top end of the case 1, so that the projection lens 4 is located in a relatively airtight space, which is beneficial for dust prevention and scratch prevention preservation of the projection lens 4. The box body 1 is provided with a stop bolt 10, the box cover 8 is provided with a U-shaped groove corresponding to the stop bolt 10, and the stop bolt 10 is used for limiting the box cover 8 so as to prevent the box cover 8 from extruding the projection lens 4.

Optionally, as shown in fig. 2 and 11, the holographic projection display device further comprises a plurality of horizontal adjustment members 9. The plurality of horizontal adjusting pieces 9 are respectively arranged at the bottom of the box body 1 and used for leveling the box body 1, so that the box body 1 can be conveniently adjusted in a balanced manner, and the projection effect is further ensured.

In this embodiment, the case 1 is further provided with a data exchange port 20 for connecting with an external electronic device for transmission of information images. The holographic projection display device in this embodiment is further provided with a controller, which is connected with the magnetic levitation device 3, the magnetic motor 5, the electrostatic fan 7, etc., and can control the magnetic levitation device 3, the magnetic motor 5, the electrostatic fan 7 to be started when needed and to be closed when not needed.

The state shown in fig. 11 is defined as an initial state of the hologram projection display device. When the holographic projection display device provided by the embodiment is used, the case cover 8 is firstly removed, then the magnetic motor 5 and the magnetic levitation device 3 are controlled to be started, the motor rotor 51 moves upwards on the guide rail 6 and drives the supporting platform 2 to move upwards, meanwhile, the magnetic levitation fixing component 31 in the magnetic levitation device 3 interacts with the levitation piece 32 to enable the levitation piece 32 to be levitated above the magnetic levitation fixing component 31, the magnetic levitation fixing component 31 and the levitation piece 32 also ascend gradually along with the supporting platform 2 in the moving process of the supporting platform 2, and when the supporting platform 2 moves to a specific position at the top of the case 1 (such as to the opening 11 of the case 1), the motor rotor 51 is controlled to stop moving and keep still. The projection device is then placed on the support platform 2 and projected through the projection optics 4. In the projection process, the distance between the projection lens 4 and the support platform 2 can be further adjusted by adjusting the current magnitude or direction in the magnetic levitation coil 313 so as to achieve the optimal projection and improve the projection effect. After projection is completed, the motor rotor 51 is controlled to move downwards on the guide rail 6, the magnetic levitation device 3 and the projection lens 4 are driven to descend, in the descending process, the guide rail 6 is avoided through the first electrostatic brush 22, the electrostatic fan 7 is avoided through the second electrostatic brush 24, and when the supporting platform 2 is in contact with the limiting structure 12, the magnetic motor 5 is controlled to be closed, so that the supporting platform 2 is supported through the limiting structure 12. Then the electrostatic fan 7 is controlled to be turned on, and the box cover 8 is buckled on the box body 1. It should be noted that, when the projection lens 4 is located in the case 1, the magnetic levitation device 3 may be controlled to be turned on or off, and when the magnetic levitation device 3 is turned on, the levitation member 32 is continuously levitated above the magnetic levitation fixing assembly 31; when the magnetic levitation device 3 is closed, the levitation member 32 may be supported on the support platform 2.

The holographic projection display device provided by the embodiment adopts an electromagnetic suspension mechanism to protect the projection lens 4 from damage; the external part can be connected to transmit the information image; and the holographic projection display device has stable and exquisite structure and low noise, and can be used for omnibearing playing in exhibition halls.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims

1. A holographic projection display, comprising:

the box body (1), the top end opening (11) of the box body (1);

the supporting platform (2) is connected with the box body (1) in a sliding manner and can move into the box body (1) through the opening (11);

the magnetic suspension device (3) comprises a magnetic suspension fixing assembly (31) and a suspension piece (32), wherein the magnetic suspension fixing assembly (31) is arranged on the supporting platform (2), the suspension piece (32) interacts with the magnetic suspension fixing assembly (31) so that the suspension piece (32) is suspended above the magnetic suspension fixing assembly (31), and the vertical distance between the suspension piece (32) and the magnetic suspension fixing assembly (31) can be adjusted by adjusting the current input to the magnetic suspension fixing assembly (31);

a projection lens (4) connected to the suspension (32); and

The magnetic motor (5), the said magnetic motor (5) connects the said supporting platform (2);

the guide rail (6), the guide rail (6) is arranged on the inner wall of the box body (1) and extends along the height direction of the box body (1), the guide rail (6) is configured to be in sliding connection with the magnetic motor (5), the supporting platform (2) is provided with a first avoiding opening (21) for avoiding the guide rail (6), and a first static brush (22) is fully distributed in the first avoiding opening (21);

the electrostatic fan (7), the lateral wall of the box body (1) is provided with a wind hole (13), the electrostatic fan (7) is arranged on the inner wall of the box body (1) and is opposite to the wind hole (13), the supporting platform (2) is provided with a second avoiding opening (23) for avoiding the electrostatic fan (7), and a second electrostatic brush (24) is fully distributed in the second avoiding opening (23);

the inner wall of box (1) is provided with limit structure (12), limit structure (12) be used for with supporting platform (2) contact, and be used for spacingly supporting platform (2) are in the position in box (1), limit structure (12) with distance between box (1) top is greater than or equal to distance between the bottom surface of supporting platform (2) with the distance between the top of projection lens (4), limit structure (12) with distance between box (1) bottom is greater than the height of magnetic suspension fixed subassembly (31), supporting platform (2) are located when box (1), can support through limit structure (12), so that magnetic motor (5) can outage when limit structure (12) support supporting platform (2).

2. Holographic projection display of claim 1, wherein the magnetic suspension fixing assembly (31) comprises a magnetic suspension base (311), a first magnet (312) and a magnetic suspension coil (313), the magnetic suspension base (311) is connected to the bottom surface of the support platform (2), the first magnet (312) and the magnetic suspension coil (313) are respectively arranged on the magnetic suspension base (311) and are positioned between the magnetic suspension base (311) and the support platform (2), and the suspension member (32) comprises a second magnet (321).

3. The holographic projection display of claim 2, wherein a plurality of said magnetic levitation coils (313) are arranged in an array, said first magnet (312) is provided in plurality, and a plurality of said first magnets (312) are disposed at intervals and around the outer circumference of a plurality of said magnetic levitation coils (313).

4. A holographic projection display as claimed in any of claims 1-3, in which the magnetic motor (5) comprises a motor mover (51) and a motor stator (52), the motor stator (52) being arranged on the guide rail (6), the motor stator (52) being configured to interact with the motor mover (51) such that the motor mover (51) slides on the guide rail (6), the support platform (2) being connected to the motor mover (51).

5. Holographic projection display according to claim 4, characterized in that the guide rail (6) has a slide groove (61), the motor stator (52) being arranged in the slide groove (61), at least part of the motor mover (51) being located in the slide groove (61).

6. The holographic projection display of claim 4, wherein the motor stator (52) comprises a plurality of third magnets (521) and a plurality of fourth magnets (522), the third magnets (521) being opposite to the fourth magnets (522), and at least one of the two opposite side walls of the guide rail (6) being alternately provided with the third magnets (521) and the fourth magnets (522) along the height direction of the case (1).

7. Holographic projection display of claim 6, wherein two opposite side walls of the guide rail (6) are a first side wall (62) and a second side wall (63), the first side wall (62) and the second side wall (63) are provided with the third magnet (521) and the fourth magnet (522), respectively, and the third magnet (521) on the first side wall (62) is arranged opposite to the fourth magnet (522) on the second side wall (63) in a direction in which the first side wall (62) points to the second side wall (63).

8. Holographic projection display according to claim 4, wherein a plurality of guide rails (6) and magnetic force motors (5) are correspondingly arranged, and a plurality of guide rails (6) are arranged at intervals along the circumferential direction of the box body (1), and motor movers (51) of each magnetic force motor (5) are connected to the supporting platform (2).

9. A holographic projection display as claimed in any of claims 1-3, in which the projection lens (4) is hollow and in the shape of an inverted prismatic table, the suspension (32) completely covering the bottom of the projection lens (4).

10. A holographic projection display as claimed in any of the claims 1-3, further comprising a cover (8), said cover (8) being connectable to said housing (1) and closing an opening (11) in the top end of said housing (1).

11. A holographic projection display as claimed in any of claims 1-3, further comprising a plurality of horizontal adjustment members (9), a plurality of said horizontal adjustment members (9) being mounted to the bottom of said housing (1) and being used for leveling of said housing (1), respectively.