Visual illusion device based on moire fringes

Abstract

The utility model belongs to the technical field of science popularization display, and particularly relates to a visual illusion device based on moire fringes. The rotating disc comprises an inner rotating disc and an outer rotating disc which coaxially and reversely rotate or coaxially and differentially rotate in the same direction, and hollowed-out stripes arranged on the inner rotating disc and the outer rotating disc intersect with each other in the axial view angle parallel to the axis of each rotating disc so as to form moire stripes; the adjacent disc faces of the inner rotary disc and the outer rotary disc are each provided with a set of magnetic sheets, magnetic poles of the adjacent ends of the two sets of magnetic sheets are mutually exclusive, the two sets of magnetic sheets matched with each other serve as a set of mutual exclusion units, and the mutual exclusion units are sequentially arranged around the axes of the corresponding rotary discs. According to the utility model, the visual illusion effect is realized, and the advantages of stable and reliable work and small size are realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of popular science display, and in particular relates to a visual illusion device based on moiré fringes. Background Art

[0002] Moire fringes are the visual result of interference between two lines or two objects at a constant angle and frequency. When the human eye cannot distinguish between the two lines or two objects, only the interference pattern can be seen. The pattern in this optical phenomenon is the moire fringes. Nowadays, people use the moiré fringe principle to make a lot of display devices. The principle is to stack a piece of evenly spaced translucent grid film on another grid paper containing two or more pattern information. The patterns in the grid paper overlap, and the same pattern is displayed in sequence and evenly spaced to form a pattern strip; the light transmission width between the grids of the grid film is set so that only one pattern on the grid paper can be transmitted, and the grids block other pattern pictures. Moving the grid film reveals another pattern and blocks the previous pattern. Continuously moving the grid film will display each pattern in turn in a cycle to achieve the effect of a moving picture; this type of display structure is described in Chinese patent announcement numbers "CN208284129U" and "CN211264755U". There are problems with the complexity of the structure and the non-replaceability of the moiré fringe pattern, resulting in a monotonous animation effect and a large volume, and limited use. For this reason, although the invention text of the Chinese patent announcement number "CN110428709A" entitled "A replaceable large-scale moiré fringe principle demonstration device" discloses relevant solutions, it not only still has a large volume, but also requires complicated additional operations such as disconnecting and closing the synchronous belt when replacing the moiré fringe pattern, and the replacement efficiency is not actually high. It can be seen from this that the prior art can neither solve the compactness of the structure nor has a detailed design for the rapid replacement of the moiré fringe pattern. In addition, the more miniaturized it is, the smaller the distance between the two plates (between the grid bar film sheet and the grid bar drawing paper) is required to produce a good effect, and too close a distance will cause the two to interfere with each other due to the beating caused by the processing accuracy, which is why the design structure of the reciprocating grid bar film sheet with a larger volume is currently adopted; the large volume means that the distance between the two plates can be appropriately increased, so as to avoid interference while ensuring a good visual illusion effect; however, the inherent large stroke of this type of reciprocating linear movement method makes it almost impossible to achieve the compactness of the overall volume, so it needs to be solved urgently. Summary of the invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a visual illusion device based on moiré fringes, which, while achieving the visual illusion effect, also has the advantages of stable and reliable operation and compact size.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A visual illusion device based on moiré fringes, characterized in that it includes an inner turntable and an outer turntable which rotate coaxially in opposite directions or coaxially and differentially in the same direction; in an axial viewing angle parallel to the axes of the turntables, the hollow fringes arranged on the inner turntable and the outer turntable intersect with each other to form moiré fringes; a group of magnetic sheets are respectively arranged at adjacent disk surfaces of the inner turntable and the outer turntable, and adjacent end magnetic poles of the two groups of magnetic sheets repel each other, so that the two groups of magnetic sheets that cooperate with each other form a set of mutually repelling units, and the mutually repelling units are arranged in sequence around the corresponding turntable axes.

[0006] Preferably, the inner turntable and the outer turntable are made of magnetically attractive metal plates, or are embedded with magnetically attractive metal plates; the magnetic sheets are soft magnetic patches, so that the magnetic sheets can be magnetically attracted to the corresponding turntables.

[0007] Preferably, in an axial perspective parallel to the axes of the turntables, more than three groups of mutually exclusive units are located on the same circle with the axes of the turntables as the center.

[0008] Preferably, the inner turntable is coaxially installed at the inner output shaft of the inner motor; the outer output shaft of the outer motor coaxially penetrates the inner motor body, then extends along the hollow tubular inner output shaft cavity and is fixed at the axis center of the outer turntable.

[0009] Preferably, an inner magnetic sheet is installed at the axis center of the inner turntable, and a coaxial hole is recessed on the end of the inner magnetic sheet facing the inner output shaft, thereby forming a coaxial plug-in key connection with the inner output shaft; the shaft end of the inner output shaft is also coaxially installed with a shaft end fixing sleeve, and the inner magnetic component is installed in the shaft end fixing sleeve, so that when the inner magnetic sheet is inserted into the shaft end of the inner output shaft, a magnetic fit is formed between the inner magnetic component and the inner magnetic sheet.

[0010] Preferably, one of the inner magnetic attraction member or the inner magnetic attraction sheet is a magnet, and the other is a magnet or an iron sheet.

[0011] Preferably, a disk body fixing sleeve is installed at the axis center of the outer turntable, and an external magnetic attraction sheet is arranged at the disk body fixing sleeve; an external magnetic attraction component is fixed to the shaft end of the outer output shaft; when the shaft end of the outer output shaft is coaxially inserted into the disk body fixing sleeve and a key connection is formed, a magnetic attraction fit is formed between the external magnetic attraction component and the external magnetic attraction sheet.

[0012] Preferably, one of the external magnetic attraction member or the external magnetic attraction sheet is a magnet, and the other is a magnet or an iron sheet.

[0013] Preferably, it also includes a box body, in which a bracket for supporting the motor seat is arranged, and the inner motor and the outer motor are coaxially installed on the sleeve-shaped motor seat; the inner output shaft and the outer output shaft pass through the prefabricated holes on the front wall of the box body and extend out of the box body, thereby matching with the corresponding turntable.

[0014] Preferably, a light-diffusing plate is further arranged at the front wall of the box, and a light strip is installed on the light-diffusing plate; in an axial viewing angle parallel to the axes of the turntables, the area where the hollow stripes are located is located in the projection area of ​​the light-diffusing plate.

[0015] The beneficial effects of the utility model are:

[0016] 1) The definition of moiré fringes is briefly described as: a difference frequency or beat frequency pattern generated when two patterns with similar spatial frequencies overlap; based on this, the utility model adopts the above scheme, on the one hand, by using two groups of turntables that rotate in the same direction at a differential speed or in opposite directions, and in combination with the hollow stripes of the two groups of turntables, a stripe effect can be achieved, thereby achieving the purpose of showing moiré fringes and achieving a visual illusion effect; on the other hand, when the moiré fringes can be achieved, the problem of interference on the small-sized disk surface needs to be solved, so the repulsive force of the same-sex magnetic poles is used to ensure that there is always a required gap between the disk surfaces of the two adjacent groups of turntables, ultimately achieving the advantages of both stable and reliable operation and compact size, with remarkable results.

[0017] 2) On the basis of the above scheme, by arranging each turntable with a metal material or an embedded metal structure, the magnetic sheet does not need to be installed with an additional fixed structure, and can be directly adsorbed, which is not only convenient for on-site disassembly and assembly, but also convenient for rapid position adjustment according to different on-site conditions, and ultimately ensures the optimal working effect. Of course, it is most preferred that each magnetic sheet is located on the same circle with the axis of each turntable as the center, so as to ensure the balanced force of each turntable and achieve its effective mutual repulsion effect.

[0018] 3) The inner turntable and the outer turntable are installed on two sets of coaxially arranged motors to further ensure their small size; during further installation, the two turntables are fixed with magnets, and the turntables are easy to replace, which is conducive to enhancing the audience's interactive experience and desire to explore.

[0019] 4) Add light strips, such as LED color light strips, to the front wall of the box, matched with a light-diffusing plate; when the two turntables rotate, moiré fringe interference can be generated, and the light strips can emit different colored lights to achieve a more gorgeous effect and better display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the assembly structure of the utility model;

[0021] Figure 2 for Figure 1 A partial enlarged view of part I;

[0022] Figure 3 for Figure 1 A partial enlarged view of part II;

[0023] Figure 4 This is the end view of the outer turntable.

[0024] The actual correspondence between the reference numbers and component names of the utility model is as follows:

[0025] 11-inner turntable; 12-outer turntable; 13-hollow stripes;

[0026] 20- magnetic disk;

[0027] 31-inner motor; 32-inner output shaft;

[0028] 41-external motor; 42-external output shaft; 42a-external magnetic attraction member;

[0029] 51-inner magnetic sheet; 52-coaxial hole;

[0030] 61-shaft end fixing sleeve; 62-inner magnetic attraction piece;

[0031] 71-disk fixing sleeve; 72-external magnetic sheet;

[0032] 80-box; 81-motor seat; 82-bracket;

[0033] 91-diffusion plate; 92-light strip. DETAILED DESCRIPTION

[0034] For ease of understanding, here we combine Figure 1-Figure 4 The specific structure and working mode of the utility model are further described as follows:

[0035] The actual structure of the utility model refers to Figure 1 As shown, its main structure includes a box 80 with a bracket 82 installed, and a motor seat 81 is arranged on the bracket 82 to install the inner motor 31 and the outer motor 41; the inner turntable 11 and the outer turntable 12 are installed at the corresponding output shafts of the inner motor 31 and the outer motor 41, so as to achieve the purpose of coaxial and co-directional differential rotation or coaxial reverse rotation of the two turntables. Accordingly, in order to improve the display effect, a light-distributing plate 91 with a light strip 92 is also added to enhance the interactive effect.

[0036] Based on the above scheme, refer to Figure 2 and Figure 4 As shown, as the core component of the utility model, the inner turntable 11 and the outer turntable 12 preferably rotate in opposite directions on the same axis, and the effect of the moiré fringe appearance is better than the coaxial and co-directional differential rotation. Of course, the hollow stripes 13 at the inner turntable 11 and the outer turntable 12 can preferably be strips with similar shapes but slightly different, or the hollow shapes are similar but not completely the same, and the moiré fringe phenomenon is more prominent.

[0037] In actual production, considering the high cost-effectiveness requirement, both the inner turntable 11 and the outer turntable 12 are thin plates with hollow stripes 13, and iron plates are embedded therein; at the same time, Figure 3As shown, a magnetic sheet 20 with strong magnetic properties is provided near the outer edge of the two turntables, which is connected to the corresponding turntable by magnetic attraction during assembly, so as to facilitate interchangeability. Since the magnetic poles of the magnetic sheets 20 at the adjacent disk surfaces of the two turntables are of the same level, they repel each other during operation, and the rotation of the two turntables can effectively solve the problem of motion interference caused by the volume of the disk and the processing accuracy when each turntable rotates.

[0038] During design, the magnetic sheet 20 can be a ring-shaped magnet, and the center of the circle is located at the axis of the corresponding turntable to ensure the mutual repulsion effect of the two turntables; however, this design will increase the weight of the turntable and also put forward certain requirements on the power of the power source. Therefore, during actual use, the utility model preferably adopts a multi-point layout of the mutual repulsion unit, that is, the magnetic sheet 20 is designed as a single point and is evenly distributed around each point near the outer edge of the corresponding turntable, which not only avoids the above-mentioned interference problem, but also does not affect the weight and movement accuracy of the corresponding turntable, achieving multiple goals at one stroke.

[0039] Further, see Figure 2 As shown, after the inner motor 31 and the outer motor 41 are installed, the inner output shaft 32 of the inner motor 31 needs to pass through the body of the outer motor 41 and the outer output shaft 42 to minimize the installation volume of the power source. The inner output shaft 32 and the inner turntable 11 are matched by conventional key connections such as splines, and the inner magnetic sheet 51 and the inner magnetic part 62 at the shaft end fixing sleeve 61 are matched to ensure the fixing effect of the two, so that they can be disassembled and assembled at any time. Similarly, the outer output shaft 42 and the outer turntable 12 are matched by key connections, and the outer magnetic sheet 72 in the disk body fixing sleeve 71 is matched with the outer magnetic part 42a on the outer output shaft 42 to ensure the purpose of convenient disassembly and assembly of the two.

[0040] like Figure 1 As shown, the utility model also includes an automatically color-changing light strip 92, and of course a single-color light strip 92 can also be used. After the light emitted by the light strip 92 passes through the light-diffusing plate 91, the color becomes softer and more gorgeous, and is set off behind the inner turntable 11. At this time, when viewed axially from the end face of the outer turntable 12, the display effect of the moiré fringe interference phenomenon can be greatly improved. Especially when the light strip 92 emits different colored lights, the effect is more gorgeous and the effect is significant.

[0041] Of course, for those skilled in the art, the present invention is not limited to the details of the above exemplary embodiments, but also includes the same or similar methods that can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is limited by the attached claims rather than the above description.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0043] The technical parts not described in detail in the present invention are all known technologies.

Claims

1. A visual illusion device based on moiré fringes, characterized in that: The invention comprises an inner turntable (11) and an outer turntable (12) which rotate coaxially in opposite directions or coaxially and differentially in the same direction. In an axial perspective parallel to the axes of the turntables, hollow stripes (13) arranged on the inner turntable (11) and the outer turntable (12) intersect with each other to form moiré stripes. A group of magnetic sheets (20) are arranged at adjacent disk surfaces of the inner turntable (11) and the outer turntable (12), respectively, and the adjacent end magnetic poles of the two groups of magnetic sheets (20) repel each other. The two groups of magnetic sheets (20) that match each other form a set of mutually repelling units, and the mutually repelling units are arranged in sequence around the corresponding turntable axes.

2. The optical illusion device based on moiré fringes according to claim 1, characterized in that: The inner turntable (11) and the outer turntable (12) are made of magnetically attractable metal plates, or are embedded with magnetically attractable metal plates; the magnetic sheet (20) is a soft magnetic patch, so that the magnetic sheet (20) can be magnetically attracted to the corresponding turntable.

3. The optical illusion device based on moiré fringes according to claim 1, characterized in that: In an axial perspective parallel to the axes of the turntables, more than three groups of mutually exclusive units are located on the same circle with the axes of the turntables as the center.

4. A visual illusion device based on moiré fringes according to claim 1, 2 or 3, characterized in that: The inner turntable (11) is coaxially mounted on the inner output shaft (32) of the inner motor (31); the outer output shaft (42) of the outer motor (41) coaxially penetrates the body of the inner motor (31), then extends along the hollow tubular inner output shaft (32) cavity and is fixed at the axis center of the outer turntable (12).

5. The optical illusion device based on moiré fringes according to claim 4, characterized in that: An inner magnetic attraction sheet (51) is installed at the axis of the inner turntable (11), and a coaxial hole (52) is recessed at one end of the inner magnetic attraction sheet (51) facing the inner output shaft (32), thereby forming a coaxial plug-in key connection with the inner output shaft (32); an axial end fixing sleeve (61) is also coaxially installed at the axial end of the inner output shaft (32), and an inner magnetic attraction component (62) is installed in the axial end fixing sleeve (61), so that when the inner magnetic attraction sheet (51) is inserted into the axial end of the inner output shaft (32), a magnetic attraction fit is formed between the inner magnetic attraction component (62) and the inner magnetic attraction sheet (51).

6. The optical illusion device based on moiré fringes according to claim 5, characterized in that: One of the inner magnetic attraction member (62) or the inner magnetic attraction sheet (51) is a magnet, and the other is a magnet or an iron sheet.

7. The optical illusion device based on moiré fringes according to claim 4, characterized in that: A disk body fixing sleeve (71) is installed at the axis of the outer turntable (12), and an external magnetic attraction sheet (72) is arranged at the disk body fixing sleeve (71); an external magnetic attraction component (42a) is fixed to the shaft end of the outer output shaft (42); when the shaft end of the outer output shaft (42) is coaxially inserted into the disk body fixing sleeve (71) and a key connection is formed, a magnetic attraction fit is formed between the external magnetic attraction component (42a) and the external magnetic attraction sheet (72).

8. The optical illusion device based on moiré fringes according to claim 7, characterized in that: One of the external magnetic attraction member (42a) or the external magnetic attraction sheet (72) is a magnet, and the other is a magnet or an iron sheet.

9. The optical illusion device based on moiré fringes according to claim 4, characterized in that: The invention also comprises a box body (80), wherein a bracket (82) for supporting a motor seat (81) is arranged inside the box body (80), and the inner motor (31) and the outer motor (41) are coaxially mounted on the sleeve-shaped motor seat (81); the inner output shaft (32) and the outer output shaft (42) pass through the prefabricated holes on the front wall of the box body (80) and then extend out of the box body (80), so as to fit into the corresponding turntable.

10. The optical illusion device based on moiré fringes according to claim 9, characterized in that: A light-distributing plate (91) is also arranged on the front wall of the box body (80), and a light strip (92) is installed on the light-distributing plate (91); in an axial viewing angle parallel to the axes of the turntables, the area where the hollow stripes (13) are located is located within the projection area of ​​the light-distributing plate (91).

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