Holographic projection device

Abstract

The invention relates to the technical field of holographic projection, in particular to a holographic projection device which comprises a rectangular frame, the four corners of the bottom face of the rectangular frame are each provided with a vertically-downward stand column, an image source seat is jointly installed on the four stand columns in a sliding mode, and the bottom ends of the four stand columns are each provided with a base. Each column is sleeved with a supporting spring, the upper end and the lower end of each supporting spring are elastically supported between the base and the image source seat, the bottom of the rectangular frame is provided with an imaging cover, the imaging cover is composed of four holographic film units which are distributed in a conical shape, the top of the rectangular frame is provided with a shading seat, and the shading seat is provided with a light source. According to the lens imaging principle, images are displayed on the left holographic film unit and the right holographic film unit after being amplified through the imaging protrusions, and for different holographic images, a shadow source shows a good 3D effect in the imaging cover.

Description

Technical Field

[0001] The present invention relates to the technical field of holographic projection, and in particular to a holographic projection device. Background Art

[0002] Holographic projection technology is a type of 3D technology, which originally refers to the technology of recording and reproducing the real three-dimensional image of an object using the principle of interference. Later, with the guidance of science fiction movies and commercial propaganda, the concept of holographic projection gradually extended to commercial activities such as stage performances and exhibitions.

[0003] Common holographic projection equipment consists of a conical cover composed of four holographic film units, and then a cover to block the light is set at the top of the conical cover, and a light hole is left at the bottom of the conical cover. When in use, the image source is placed on the light hole, and the image source shoots a special image through the light hole into the conical cover, so that the flat image is displayed in a 3D stereoscopic state in the conical cover.

[0004] This 3D stereoscopic state display method is relatively simple. The displayed 3D stereoscopic image cannot be adjusted by the user except for the dynamic style of the image itself. The presented 3D stereoscopic feeling is not strong and the experience is poor. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a holographic projection device, comprising a rectangular frame, wherein a vertical downward column is respectively provided at the four corners of the bottom surface of the rectangular frame, an image source seat is slidably installed on the four columns together, a base is respectively installed at the bottom end of the four columns, and a support spring is sleeved on each of the columns, and the upper and lower ends of the support spring are elastically supported between the base and the image source seat, an imaging cover is installed at the bottom of the rectangular frame, and the imaging cover is composed of four holographic film units distributed in a cone, a shading seat is installed at the top of the rectangular frame, the conical large mouth end of the imaging cover covers the bottom side of the shading seat upward, and the conical small mouth end of the imaging cover is downward close to the center of the image source seat and is installed with an enlargement seat, a mobile phone is placed in the image source seat, and the image is enlarged through the enlargement seat and the holographic film unit The technology is presented in the imaging hood, and two groups of left and right imaging plate assemblies are arranged on the shading seat, and the two imaging plate assemblies are composed of a first imaging plate and a second imaging plate hinged together. Two left and right slots are opened on the shading seat, and the first imaging plate on the left is inserted into the slot on the left and corresponds to the top of the left holographic film unit, and the first imaging plate on the right is inserted into the slot on the right and corresponds to the top of the right holographic film unit. A steel wire is connected between the second imaging plate on the left and the left side of the image source seat, and a steel wire is connected between the second imaging plate on the right and the right side of the image source seat. When the image source seat is adjusted with a mobile phone relative to the bottom of the imaging hood, the left and right first imaging plates are raised and lowered relative to the left and right holographic film units by pulling the steel wire. The surface of the first imaging plate is provided with an imaging protrusion.

[0006] The inner side of the image source seat is provided with a downwardly concave carrier plate, the magnifying seat is composed of a corrugated seat and a magnifying glass, the top of the corrugated seat is connected to the conical small mouth of the image cover, and the magnifying glass is connected to the bottom of the corrugated seat.

[0007] Four sliding holes are provided on the image source seat, and each of the sliding holes slides on one of the pillars.

[0008] The bottom edges of the left and right slots are provided with arc surfaces, and the arc surfaces are in an arc transition toward the center direction of the imaging cover.

[0009] The four sides of the tapered opening of the imaging cover cover the outside of the two left and right slots, so that the two left and right slots cover the inside of the tapered opening of the imaging cover.

[0010] Four groups of driving mechanisms are provided on the top of the shading seat, and each group of the driving mechanisms corresponds to a group of the imaging board components. The driving mechanism includes a gear transmission mechanism, a connecting rod structure and a directional rod. The gear transmission mechanism includes a first connecting arm installed in the shading seat, a driven gear installed on the first connecting arm, a second connecting arm installed in the shading seat, and a driving gear installed on the second connecting arm. The driving gear is meshed with the driven gear. The gear transmission mechanism also includes a rack arranged in the shading seat, and the rack extends horizontally toward the direction of the second imaging board and is hinged to the second imaging board through a connecting rod structure. The driven gear is meshed with the bottom of the rack to drive the rack to drive the second imaging board to move linearly through the connecting rod structure. While the second imaging board moves linearly, the first imaging board is driven to rise and fall along the slot relative to the holographic film unit on the same side by utilizing the hinged relationship. The top end of the steel wire is connected to the driving gear, and the steel wire can drive the driving gear to rotate when being dragged downward.

[0011] An orientation slot is provided in the length direction of the rack, one end of the orientation rod is connected to the light shielding seat, and the other end of the orientation rod is slidably fitted in the orientation slot.

[0012] A guide groove is provided at the end of the light-shielding seat, and the rack is slidably assembled in the guide groove.

[0013] The driving mechanism also includes a reset spring. A first pull plate is fixed on the surface of the driving gear, a second pull plate is fixed on the second connecting arm, a through hole is provided on the second pull plate, the steel wire passes through the through hole and enters the surface of the driving gear and is connected to the first pull plate, the reset spring is sleeved on the steel wire, and both ends of the reset spring are restricted between the first pull plate and the second pull plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention has a carrier plate, which is located at the bottom side of the imaging cover and can be raised and lowered relative to the imaging cover. When in use, the image source device is placed on the carrier plate, the image source device is pressed to lower it, and the magnifying glass is placed on the image source, so that the image source is magnified and presented in the imaging cover, thereby improving the 3D imaging effect.

[0016] 2. The present invention arranges four sets of driving mechanisms on the top seat. When the carrier plate with the image source device descends more, it will drag four steel wires downward. The four steel wires drag the four driving gears on the four sets of driving mechanisms to rotate. The reset springs on the driving gears are compressed and shortened, forcing the left and right first imaging plates to block the inner sides of the left and right holographic film units. At this time, when the original image is presented to both sides, it will not be directly fed back to the left and right holographic film units for imaging, but will be blocked by the left and right first imaging plates and enter the left and right imaging protrusions. According to the lens imaging principle, the image is magnified through the imaging protrusions and then displayed on the left and right holographic film units. For different holographic images, the image source shows a better 3D effect in the imaging cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a holographic projection device provided in an embodiment of the present invention;

[0018] Figure 2 A holographic projection device provided in an embodiment of the present invention comprises Figure 1 The enlarged schematic diagram of the A part is shown;

[0019] Figure 3 A holographic projection device provided in an embodiment of the present invention comprises Figure 1 A schematic diagram from another perspective;

[0020] Figure 4 A holographic projection device provided in an embodiment of the present invention comprises Figure 3 The enlarged schematic diagram of the B part is shown;

[0021] Figure 5 A schematic diagram of a main-view plane of a holographic projection device provided in an embodiment of the present invention;

[0022] Figure 6 A partially cutaway schematic diagram of a holographic projection device provided by an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the planar structure of only the magnifying seat in a holographic projection device provided in an embodiment of the present invention.

[0024] In the figure: 1. rectangular frame; 2. column; 3. image source seat; 4. base; 5. support spring; 6. image cover; 7. holographic film unit; 8. light shielding seat; 9. magnifying seat; 91. corrugated seat; 92. magnifying glass; 10. image plate assembly; 11. first image plate; 12. second image plate; 13. slot; 14. steel wire; 15. carrier plate; 16. sliding hole; 17. arc surface; 18. image protrusion; 19. driving mechanism; 20. gear transmission mechanism; 21. connecting rod structure; 22. directional rod; 23. first connecting arm; 24. driven gear; 25. second connecting arm; 26. driving gear; 27. rack; 28. directional groove; 29. ​​guide groove; 30. first pull plate; 31. second pull plate; 32. perforation; 33. reset spring. DETAILED DESCRIPTION

[0025] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0026] In one embodiment, if Figure 1-Figure 7 As shown:

[0027] The present embodiment provides a holographic projection device, including a rectangular frame 1, wherein a vertically downward column 2 is respectively provided at the four corners of the bottom surface of the rectangular frame 1, an image source seat 3 is slidably installed on the four columns 2, a base 4 is respectively installed at the bottom end of the four columns 2, and each column 2 is respectively sleeved with a support spring 5 of the same length, and the upper and lower ends of the support spring 5 are elastically supported between the base 4 and the image source seat 3, an image cover 6 is installed at the bottom of the rectangular frame 1, and the image cover 6 is composed of four holographic film units 7 distributed in a cone shape, and a light shielding seat 8 is installed on the top of the rectangular frame 1. The conical large mouth end of the cover 6 covers the bottom side of the shading seat 8 upward, and the conical small mouth end of the imaging cover 6 approaches the center of the image source seat 3 downward and is installed with a magnifying seat 9. The mobile phone is placed in the image source seat 3, and the image is magnified by the magnifying seat 9 and presented in the imaging cover 6 by the holographic film unit 7 technology. The shading seat 8 is provided with two groups of left and right imaging board assemblies 10, and the two imaging board assemblies 10 are composed of a first imaging board 11 and a second imaging board 12 hinged together. The shading seat 8 is provided with two left and right slots 13. The first imaging board 11 on the left is inserted into the slot 13 on the left and corresponds to the holographic film unit 7 on the left. , the first imaging plate 11 on the right is inserted into the slot 13 on the right and corresponds to the top of the holographic film unit 7 on the right. A steel wire 14 is connected between the second imaging plate 12 on the left and the left side of the image source seat 3. A steel wire 14 is connected between the second imaging plate 12 on the right and the right side of the image source seat 3. When the image source seat 3 is adjusted relative to the bottom of the imaging cover 6 with a mobile phone, the left and right first imaging plates 11 are raised and lowered relative to the left and right holographic film units 7 by pulling the steel wire 14. Imaging protrusions 18 are provided on the surfaces of both sides of the first imaging plate 11 and the second imaging plate 12. The imaging protrusion 18 is similar to a magnifying glass. Of course, the imaging protrusion 18 can also be a concave mirror. When the first imaging plate 11 and the second imaging plate 12 are pulled into the imaging cover 6, it is equivalent to blocking them within the left and right holographic film units 7. When the image source enters the imaging cover 6, it will not directly irradiate the holographic film unit 7, but needs to pass through the imaging protrusion 18 and then irradiate the holographic film unit 7. According to the lens imaging principle, the image is magnified through the imaging protrusion 18 and then displayed on the left and right holographic film units 7. For different holographic images, the image source shows a better 3D effect in the imaging cover 6.

[0028] like Figure 1 , Figure 5 as well as Figure 7As shown, the inner side of the image source seat 3 is provided with a carrier plate 15 which is concave downwards, and the magnifying seat 9 is composed of a corrugated seat 91 and a magnifying glass 92. The top of the corrugated seat 91 is connected to the conical small opening of the image cover 6, and the magnifying glass 92 is connected to the bottom end of the corrugated seat 91. The conical small opening of the image cover 6 is the entrance for the image source to enter the image cover 6. Since the corrugated seat 91 is provided on the small opening and the magnifying glass 92 is provided at the bottom end of the corrugated seat 91, when the image source device is placed on the carrier plate 15, the carrier plate 15 will drop under the load, the corrugated seat 91 will automatically lengthen, and the bottom of the magnifying glass 92 will be attached to the image source surface of the image source device.

[0029] Four groups of driving mechanisms 19 are arranged on the top of the shading seat 8, each group of driving mechanisms 19 corresponds to a group of imaging plate components 10, the driving mechanism 19 includes a gear transmission mechanism 20, a connecting rod structure 21 and a directional rod 22, the gear transmission mechanism 20 includes a first connecting arm 23 installed in the shading seat 8, a driven gear 24 installed on the first connecting arm 23, a second connecting arm 25 installed in the shading seat 8, and a driving gear 26 installed on the second connecting arm 25, the driving gear 26 is meshed with the driven gear 24, and the gear transmission mechanism 20 also includes a first connecting arm 23 installed in the shading seat 8, a driven gear 24 installed on the first connecting arm 23, and a second connecting arm 25 installed in the shading seat 8. The rack 27 in 8 extends horizontally toward the second imaging plate 12 and is hinged on the second imaging plate 12 through the connecting rod structure 21. The driven gear 24 is engaged with the bottom of the rack 27 to drive the rack 27 to drive the second imaging plate 12 to move linearly through the connecting rod structure. While the second imaging plate 12 moves linearly, the hinge relationship is used to drive the first imaging plate 11 to rise and fall along the slot 13 relative to the holographic film unit 7 on the same side. The top end of the steel wire 14 is connected to the driving gear 26, and the driving gear 26 can be driven to rotate when the steel wire 14 is dragged downward.

[0030] The driving mechanism 19 also includes a return spring 33. A first pull plate 30 is fixed on the surface of the driving gear 26. A second pull plate 31 is fixed on the second connecting arm 25. A through hole 32 is opened on the second pull plate 31. The steel wire 14 passes through the through hole 32 and enters the surface of the driving gear 26 to be connected to the first pull plate 30. The return spring 33 is sleeved on the steel wire 14, and both ends of the return spring 33 are restricted between the first pull plate 30 and the second pull plate 31.

[0031] When in use, the image source device (such as a mobile phone) is placed on the carrier 15. At this time, the carrier 15 is loaded and drives the image source seat 3 to descend through the four sliding holes 16 along the four columns 2 until the image source reaches the bottom of the magnifying glass 92. At this time, the support spring 5 is compressed and shortened. At this time, the corrugated seat 91 automatically extends and presses the magnifying glass 92 on the image source. The image source device is turned on. The image source enters the corrugated seat 91 after being magnified by the magnifying glass 92, and enters the imaging cover 6 after being collected by the corrugated seat 91. After the four holographic film units 7 of the imaging cover 6 are focused and collected, the image source is displayed in the imaging cover 6 in a 3D stereoscopic manner according to the existing holographic projection technology. In addition to this existing imaging technology, the present invention also has the following technical effects: Press the image source device to make the image source device drive the carrier 1 5 descends, and the image source seat 3 is driven by the carrier plate 15 to continue to descend. At this time, the support spring 5 continues to be compressed and shortened, and the corrugated seat 91 continues to release its length downward, so that the magnifying glass 92 continues to press against the image source. At this time, the image source seat 3 descends by a large amplitude, and will drag the four steel wires 14 downward. The four steel wires 14 drag the four driving gears 26 to rotate, and the reset spring 33 is compressed and shortened. The two driving gears 26 on the left rotate counterclockwise and drive the two driven gears 24 on the left to rotate clockwise. The two driven gears 24 on the left drive the two racks 27 on the left to move right. The two racks 27 on the left push the connecting rod structure 21 to move right, and the connecting rod structure 21 on the left pushes the second imaging plate 12 on the left to move right. The second imaging plate 12 on the left moves to the first imaging plate 12 on the left. 11 provides thrust, forcing the first imaging plate 11 on the left to be inserted into the left side of the inner cavity of the imaging cover 6 along the slot 13 on the left; similarly, the two active gears 26 on the right rotate clockwise, and drive the two driven gears 24 on the right to rotate counterclockwise, and the two driven gears 24 on the right drive the two racks 27 on the right to move right, and the two racks 27 on the right push the connecting rod structure 21 to move left, and the two connecting rod structures 21 on the right push the second imaging plate 12 on the right to move left, and the second imaging plate 12 on the right provides thrust to the first imaging plate 11 on the right, forcing the first imaging plate 11 on the right to be inserted into the right side of the inner cavity of the imaging cover 6 along the slot 13 on the right. If the descending amplitude of the carrier plate 15 is greater, the downward dragging stroke of the four steel wires 14 will be greater, and the four The larger the rotation amplitude of the steel wire 14 carrying the four active gears 26, and according to the above-mentioned transmission relationship, the lowering amplitude of the left and right first imaging plates 11 becomes larger. At this time, the left and right first imaging plates 11 are equivalent to adding two left and right imaging plates in the imaging cover 6. The two first imaging plates 11 block the inner sides of the left and right holographic film units 7. At this time, when the original image is presented to both sides, it will not be directly fed back to the left and right holographic film units 7 for imaging, but will be blocked by the left and right first imaging plates 11 and enter the left and right imaging protrusions 18. According to the lens imaging principle, the image is magnified through the imaging protrusions 18 and then displayed on the left and right holographic film units 7. For different holographic images, the image source shows a better 3D effect in the imaging cover 6.

[0032] Continuing from the above, if the descending amplitude of the carrier plate 15 continues to increase, the downward dragging stroke of the four steel wires 14 is larger, and the rotation amplitude of the four driving gears 26 with the four steel wires 14 is larger. According to the above transmission relationship, the descending amplitude of the left and right first imaging plates 11 is increased again, and the left and right first imaging plates 11 will drag the left and right second imaging plates 12 into the imaging cover 6. Imaging protrusions 18 are also provided on both sides of the second imaging plates 12. At this time, the same side will have upper and lower groups of imaging protrusions 18 blocking the inner side of the holographic film unit 7 on the same side. According to the lens imaging principle, the image is processed through the upper and lower groups of imaging protrusions 18 and then fed back to the left and right holographic film units 7. The 3D display effect of the image source in the imaging cover 6 is further improved.

[0033] Continuing from the above, the image source device is removed and no longer pressed. The support spring 5 is now released in length upward, the carrier plate 15 and the image source seat 3 rise and reset, the four steel wires 14 relax upward, the reset spring 33 recovers its length, and the first pull plate 30 is used to push the four driving gears 26 to rotate in the opposite direction, the four driving gears 26 drive the four driven gears 24 to rotate, the four racks 27 of the four driven gears 24 return in the opposite direction, and the four connecting rod structures 21 are used to drag the first imaging plate 11 and the second imaging plate 12 back upward.

[0034] like Figure 2 , Figure 4 As shown, an orientation groove 28 is provided in the length direction of the rack 27, one end of the orientation rod 22 is connected to the light shielding seat 8, and the other end of the orientation rod 22 is slidably fitted in the orientation groove 28. A guide groove 29 is provided at the end of the light shielding seat 8, and the rack 27 is slidably assembled in the guide groove 29. Specifically, the outer end of the rack 27 is slidably fitted in the guide groove 29, and when the left and right racks 27 move linearly, the middle area thereof is positioned and guided by the orientation rod 22, and the outer end thereof is positioned and guided by the guide groove 29, so as to ensure the smooth movement of the rack 27.

[0035] like Figure 6 As shown, the four sides of the tapered opening of the imaging cover 6 cover the outside of the left and right slots 13, so that the left and right slots 13 cover the inside of the tapered opening of the imaging cover 6. Since the first imaging board 11 is inserted into the slots 13, it can prevent the image from transmitting light upward, ensuring that the image source is in a light-shielded environment when entering the imaging cover 6, meeting the 3D imaging requirements.

[0036] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described according to their actual installation and actual use as well as the customary orientations of technicians in this field. This is hereby explained.

[0037] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A holographic projection device, characterized in that: The invention comprises a rectangular frame (1), wherein each of the four corners of the bottom surface of the rectangular frame (1) is provided with a vertically downward column (2), an image source seat (3) is slidably mounted on the four columns (2), a base (4) is mounted on the bottom end of each of the four columns (2), a support spring (5) is sleeved on each of the columns (2), the upper and lower ends of the support spring (5) are elastically supported between the base (4) and the image source seat (3), and an image display cover (6) is mounted on the bottom of the rectangular frame (1), and the image display cover (6) is mounted on the bottom of the rectangular frame (1). 6) is composed of four holographic film units (7) distributed in a cone shape, a shading seat (8) is installed on the top of the rectangular frame (1), the conical large mouth end of the image hood (6) covers the bottom side of the shading seat (8) upward, the conical small mouth end of the image hood (6) approaches the center of the image source seat (3) downward and is installed with an enlargement seat (9), a mobile phone is placed in the image source seat (3), the image is enlarged by the enlargement seat (9) and the holographic film unit (7) is technically presented in the image hood (6), the shading seat (8) ) is provided with two groups of left and right image presentation board assemblies (10), the two image presentation board assemblies (10) are composed of a first image presentation board (11) and a second image presentation board (12) which are hinged to each other, and the light shielding seat (8) is provided with two left and right slots (13), the first image presentation board (11) on the left side is inserted into the slot (13) on the left side and corresponds to the top of the left holographic film unit (7), the first image presentation board (11) on the right side is inserted into the slot (13) on the right side and corresponds to the top of the right holographic film unit (7), and the first image presentation board (11) on the left side is inserted into the slot (13) on the right side and corresponds to the top of the right holographic film unit (7), and the first image presentation board (11) on the left side is inserted into the slot (13) on the right side and corresponds to the top of the right holographic film unit (7). A steel wire (14) is connected between the second imaging plate (12) and the left side of the image source seat (3), and a steel wire (14) is connected between the second imaging plate (12) on the right side and the right side of the image source seat (3). When the image source seat (3) is adjusted in height relative to the bottom end of the imaging cover (6) with a mobile phone, the steel wire (14) is pulled to raise or lower the height of the two first imaging plates (11) on the left and right relative to the two holographic film units (7). The surface of the first imaging plate (11) is provided with an imaging protrusion (18).

2. A holographic projection device according to claim 1, characterized in that: The inner side of the image source seat (3) is provided with a downwardly concave carrier plate (15), and the magnifying seat (9) is composed of a corrugated seat (91) and a magnifying glass (92). The top end of the corrugated seat (91) is connected to the conical small opening of the image cover (6), and the magnifying glass (92) is connected to the bottom end of the corrugated seat (91).

3. A holographic projection device according to claim 2, characterized in that: Four sliding holes (16) are provided on the image source seat (3), and each of the sliding holes (16) slides on one of the pillars (2).

4. A holographic projection device according to claim 3, characterized in that: The bottom edges of the left and right slots (13) are provided with arc surfaces (17), and the arc surfaces (17) transition in an arc shape toward the center of the imaging cover (6).

5. A holographic projection device according to claim 4, characterized in that: The four sides of the tapered opening of the imaging cover (6) cover the outside of the two left and right slots (13), so that the two left and right slots (13) cover the inside of the tapered opening of the imaging cover (6).

6. A holographic projection device according to claim 5, characterized in that: Four groups of driving mechanisms (19) are arranged on the top of the light-shielding seat (8), each group of the driving mechanisms (19) corresponds to a group of the imaging plate assemblies (10), the driving mechanisms (19) include a gear transmission mechanism (20), a connecting rod structure (21) and a directional rod (22), the gear transmission mechanism (20) includes a first connecting arm (23) installed in the light-shielding seat (8), a driven gear (24) installed on the first connecting arm (23), a second connecting arm (25) installed in the light-shielding seat (8), and a driving gear (26) installed on the second connecting arm (25), the driving gear (26) meshing with the driven gear (24), the gear transmission mechanism (20) also includes a first connecting arm (23) installed in the light-shielding seat (8), a second connecting arm (25) installed in the light-shielding seat (8), and a second connecting arm (25) installed on the second connecting arm (25), the second connecting arm (25) meshing with the driven gear (24), and the second connecting arm (25) is provided on the light-shielding seat. (8), the rack (27) extends horizontally toward the second imaging plate (12) and is hinged on the second imaging plate (12) through a connecting rod structure. The driven gear (24) is engaged with the bottom of the rack (27) to drive the rack (27) to drive the second imaging plate (12) to move linearly through the connecting rod structure (21). At the same time as the second imaging plate (12) moves linearly, the first imaging plate (11) is driven to move up and down along the slot (13) relative to the holographic film unit (7) on the same side by utilizing the hinge relationship. The top end of the steel wire (14) is connected to the driving gear (26). When the steel wire (14) is dragged downward, it can drive the driving gear (26) to rotate.

7. A holographic projection device according to claim 6, characterized in that: An orientation slot (28) is provided in the length direction of the rack (27); one end of the orientation rod (22) is connected to the light shielding seat (8); and the other end of the orientation rod (22) is slidably fitted in the orientation slot (28).

8. A holographic projection device according to claim 7, characterized in that: A guide groove (29) is provided at the end of the light shielding seat (8), and the rack (27) is slidably assembled in the guide groove (29).

9. A holographic projection device according to claim 8, characterized in that: The driving mechanism (19) further comprises a return spring (33); a first pull plate (30) is fixed on the surface of the driving gear (26); a second pull plate (31) is fixed on the second connecting arm (25); a through hole (32) is provided on the second pull plate (31); the steel wire (14) passes through the through hole (32) and enters the surface of the driving gear (26) to be connected to the first pull plate (30); the return spring (33) is sleeved on the steel wire (14), and both ends of the return spring (33) are restricted between the first pull plate (30) and the second pull plate (31).

Images