A double-tail fish dynamic shaking 3D display method based on pull triggering

Abstract

This invention discloses a 3D display method for a dynamic shaking of two fish tails based on a pull-triggered mechanism. In this invention, two fish with tails swinging in opposite directions are printed side-by-side on the inner box. One fish's shadow projects outwards and its highlight moves forward, while the other's shadow is the opposite, creating a slight parallax between them. The back of the transparent window on the outer shell is engraved with equally spaced light-blocking stripes. When the inner box is pushed in, the stripes block the right-swinging image, revealing only the left-swinging image; when pulled out, the stripes reverse, revealing only the right-swinging image. With a push and pull, the two images of fish tails with different depths are rapidly alternately presented to the eyes. Due to visual persistence, the brain automatically merges them into a 3D animation of a tail swaying back and forth. This method is more eye-catching on a shelf than traditional static printing. The crisp feel of the positioning springs during the push and pull also enhances the sense of quality. This adds interactive fun and a strong visual memory to the packaging at a very low cost.

Description

Technical Field

[0001] This invention belongs to the field of packaging technology, specifically a method for dynamic shaking 3D display of a double-tailed fish based on pull-triggered motion. Background Technology

[0002] In the packaging industry, to make products more attractive on shelves, various technical solutions have been explored to create dynamic effects from static printed patterns. One common approach uses lenticular lenses, which involves laminating a transparent film with micro-cylindrical mirrors onto the surface of the printed layer. The lenses refract multiple intersecting images below, creating a switching or 3D effect as the viewer changes their perspective. This method requires specialized printing equipment to imprint multiple frames into extremely fine, intersecting stripes. The lenticular film itself requires very high registration accuracy, and stretching during production can easily cause blurring or crosstalk. Lens lenticular films are typically over 0.3mm thick, making them stiffer than ordinary cardboard. When applied near the fold lines of packaging boxes, they are prone to curling or delamination, affecting the overall smoothness and durability of the packaging. Furthermore, the visual effect of lenticular lenses is highly dependent on the angle of the external light source. In the diffuse overhead lighting common in retail shelves, the 3D effect is often severely diminished, making it difficult for consumers to immediately perceive the dynamic changes. Another approach is to embed a miniature electronic display screen and a switch trigger device into the packaging to play preset dynamic images.

[0003] However, in existing technologies, the lens grating solution can only switch the image by changing the viewer's perspective. The dynamic effect is completely disconnected from the consumer's action of opening the packaging, and the three-dimensional effect is severely degraded in the overhead lighting environment of the store. The electronic display solution requires battery and circuit support, and the material cost and assembly complexity are high, which cannot meet people's growing usage needs. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, the present invention aims to provide a 3D display method for dynamic shaking of a double-tailed fish based on pull-triggered motion.

[0005] The technical solution adopted in this invention is as follows: A method for dynamically shaking a double-tailed fish in 3D based on pull-triggered motion, comprising the following steps:

[0006] S1: Design a dual-angle 3D fish tail pattern. Draw two fish images with completely overlapping body outlines, eyes, and fins, only the tails swing in opposite directions: one swings to the left, and the other to the right. Add 0.3-0.5mm of shadow gradation and scale highlight offset to each fish tail to create parallax depth cues, providing a pair of switchable 3D view bases for the raster filter in S2. The texture positions must be strictly aligned.

[0007] S2: Custom-designed pull-out grating panel. A high-transparency acrylic sheet is used, and a set of opaque stripes parallel to the pull-out direction are laser-etched on the back. The stripes are 1.0mm wide and 1.8mm apart, with a period precisely matching the alternating pitch of the S1 double pattern. A baseline etching depth is established, with a ±0.1mm margin for fine-tuning in the S6 calibration stage, ensuring that the left and right views are reliably and alternately obscured during pull-out.

[0008] S3: Construct a sliding guide and stop mechanism. Trapezoidal raised sliders are installed on both sides of the inner box, and a corresponding straight rail groove is opened on the inner wall of the outer shell. The length of the groove is the total width of three stripe cycles of the S2 grating. U-shaped spring pieces are embedded at both ends of the groove as positioning points. The locking position refers to the alignment coordinates of the two fishtail postures in S4 to ensure that the pattern and the grating automatically enter precise left or right swing when pushed or pulled to the end.

[0009] S4: Pull-out triggers 3D dynamic switching. When the inner box is fully pushed in, the lenticular lens covers the right-side pattern, revealing the left-side view. The front spring engages and confirms the position, creating a 3D effect of the fish tail swinging forward. When pulled out to the outer stop, the lenticular lens covers the left side, revealing the right side, and the rear spring engages, creating a backward swinging posture. Continuous pushing and pulling utilizes visual persistence to create a non-electrically driven 3D rocking animation of a double-tailed fish.

[0010] S5: Adjustment of feel and feedback integration. 0.2mm thick soft polyurethane pads are attached to the contact surfaces of the two spring contacts in S3 to produce a crisp "click" feel during positioning. At the same time, the push and pull force is controlled at 5-6N. Too much force will cause the view to shift if the positioning is too easy, while too much force will destroy the smooth feeling of the continuous tail swing in S4.

[0011] S6: 3D Ghosting Elimination and Depth Calibration. Use red and blue dual-color test strips to push and pull to observe color separation, and simultaneously fine-tune the horizontal gap of the slider, the grating etching depth, and the vertical offset of the pattern (±0.05mm). Repeatedly correct until there is no ghosting, no color crosstalk, and the three-dimensional effect is clear and natural.

[0012] In a preferred embodiment, in step S1, in order to create a three-dimensional depth suggestion, a gradient shadow layer is added to the edge of the tail of each fish, and the highlight points of the scales are shifted 0.3mm to 0.5mm in the direction of their respective swings, so that the tail of the left swing image looks as if it is floating forward, while the tail of the right swing image looks as if it is retracting backward.

[0013] In a preferred embodiment, in step S1, the two images are ultimately attached side by side to the same reference plane of the inner box. Their spacing must strictly correspond to the period of the subsequent grating stripes. The left and right patterns are arranged alternately to provide a pair of switchable 3D view bases for the grating occlusion switching. A high-precision positioning mold is used during attachment to ensure that no misalignment occurs.

[0014] In a preferred embodiment, in step S2, a high-transparency acrylic sheet with a thickness between 1mm and 2mm is selected, and a row of parallel light-blocking stripes is etched on the back of the sheet using a laser. The direction of the stripes must be completely parallel to the direction of the box's pull-out movement; even a slight tilt will introduce moiré pattern interference visually. The width of a single light-blocking stripe is set to 1.0mm, and the light-transmitting gap between adjacent stripes is 1.8mm. This set of periodic values ​​directly depends on the pitch of the alternating left and right fish patterns in S1.

[0015] In a preferred embodiment, in step S2, the etching depth is first processed based on about one-third of the plate thickness, and a depth adjustment margin of ±0.1mm is actively left. This allows for fine-tuning by etch or filling during the final calibration stage, ensuring that the two fishtail patterns can be reliably and alternately covered by these stripes during the pull-out displacement.

[0016] In a preferred embodiment, in step S3, a trapezoidal cross-section protruding slider is fixed to each of the two outer walls of the inner box. The cross-section of the slider, which is narrower at the top and wider at the bottom, can limit the amount of swaying of the inner box in the slide groove. Two straight rectangular slide grooves are milled into the inner wall of the red outer shell at corresponding positions. The length of the slide groove is equal to the total width of three complete stripe cycles on the grating panel. This stroke can just cover one complete switch between the left and right views.

[0017] In a preferred embodiment, in step S3, a U-shaped spring is riveted to each end of the slide groove, with the opening of the spring facing the direction of the slider's movement. When the inner box is pushed to or pulled to the bottom, the slider will be squeezed into the spring and locked in place. The specific installation coordinates of the spring need to be determined through repeated trial assembly. At the moment the spring is locked when pushed to the bottom, the grating must be exactly aligned with the left swing pattern, and when pulled out to the end point, it must be aligned with the right swing pattern. The positioning accuracy is ultimately calibrated by adjusting the elongation of the spring's riveting hole.

[0018] In a preferred embodiment, in step S4, after the inner box is fully pushed into the outer shell, the light-blocking stripes on the grating panel precisely block the right-swinging fish image, leaving only the lines of the left-swinging fish image visible through the light-transmitting gap. Simultaneously, the U-shaped spring at the front end falls into the slider notch, providing a clear sense of segmentation. At this point, the parallax signal of the fish tail moving forward and the shadows projecting forward creates a three-dimensional effect of the fish tail swinging outward. Pulling the inner box outward to its end point causes the grating stripes to switch to blocking the left-swinging fish image while revealing the right-swinging fish image. The spring at the rear end also engages simultaneously, causing the fish tail's highlights to recede and the shadows to shrink, forming a posture of the tail swinging back. By continuously pushing and pulling the inner box, the user experiences alternating visual stimulation of the eyes at intervals of tens of milliseconds. With the help of visual persistence, this visual stimulation merges into a continuous three-dimensional animation of a two-tailed fish swaying in the mind. The entire process requires no electricity.

[0019] In a preferred embodiment, in step S5, a 0.2mm thick soft polyurethane gasket is adhered to the surface of the U-shaped springs at both ends of the slide groove where they directly contact the slider. This gasket absorbs the impact energy of the metal parts, causing a sound and tactile feedback when the slider engages the positioning point. Simultaneously, the resistance to pulling is checked, stabilizing the force required for pushing and pulling between 5N and 6N. This force value is approximately equal to the resistance felt when lightly pushing a standard lighter pulley. If the resistance is below this range, the inertia of the inner box may easily break through the spring positioning, causing misalignment between the grating and the fish image, resulting in residual ghosting. If the resistance is too high, the continuous pushing and pulling rhythm will be interrupted, disrupting the smoothness of the fish tail's movement.

[0020] In a preferred embodiment, in step S6, a set of red and blue dual-color test patterns is prepared. The fish pattern on the left is printed in red, and the fish pattern on the right is printed in blue. After being affixed to the corresponding positions on the inner box, the pattern is observed by pushing and pulling through the grating. If the red and blue shadows overlap at some point in the movement path, it indicates that the grating is simultaneously revealing the left and right patterns, causing color crosstalk. At this time, three parameters need to be adjusted in conjunction: reduce the lateral fit gap between the slide and the slider to eliminate the swaying when the inner box moves; use the 0.1mm depth margin reserved in step S2 to perform secondary laser subtraction or fill transparent resin to correct the obscuring angle of the grating stripes; and apply a slight offset of ±0.05mm to the pattern bonding surface in the vertical direction to change the relative position of the light-transmitting gap and the pattern lines. These three items are repeatedly corrected until only a single, pure fish shadow is presented throughout the entire pushing and pulling stroke, and the three-dimensional depth of the fish tail extending outward and retracting is stable and natural.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] In this invention, two fish with oppositely swaying tails are printed side-by-side on the inner box. One fish's shadow projects outwards and its highlight moves forward, while the other's shadow is the opposite, creating a slight parallax. The back of the transparent window on the outer shell is engraved with equally spaced light-blocking stripes. When the inner box is pushed in, the stripes block the right-swaying image, revealing only the left-swaying image; when pulled out, the stripes reverse, revealing only the right-swaying image. With each push and pull, the two images of fish tails with varying depths are rapidly and alternately presented to the eyes. The brain, through visual persistence, automatically merges them into a 3D animation of a tail swaying back and forth. The entire process relies entirely on the physical blocking of the lenticular lens and the human eye's depth perception, requiring no batteries, screens, or any electronic components. Used on packaging, this dynamic pattern instantly brings static printed materials to life. Consumers trigger the fish tail swaying effect simply by opening the packaging or handling the inner box, making it more eye-catching on shelves than traditional static printing. The crisp feel of the positioning springs during pushing and pulling also enhances the sense of quality, adding interactive fun and strong visual memorability to the packaging at a very low cost. Attached Figure Description

[0023] Figure 1 This is a simplified schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the process principle in this invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] Reference Figure 1-2 A method for dynamically shaking a double-tailed fish using a pull-triggered 3D display, comprising the following steps:

[0027] S1: Design a two-dimensional fish tail pattern from a dual angle. Draw two fish images with completely overlapping body outlines, eyes, and fins, only the tails swing in opposite directions: one swings to the left, and the other to the right. Add 0.3-0.5mm of shading and scale highlight offset to each fish tail to create parallax;

[0028] S2: Customized pull-out grating panel. Take a high-transparency acrylic sheet and use a laser to etch a set of opaque stripes on the back that are completely parallel to the pull-out direction. The stripes are 1.0mm wide and 1.8mm apart, and the period is precisely matched with the alternating pitch of the double fish pattern in step S1.

[0029] S3: Construct a sliding guide and stop mechanism. Trapezoidal protruding sliders are installed on both sides of the inner box, and a corresponding straight rail groove is opened on the inner wall of the outer shell. The length of the groove is the total width of three fringe periods of the S2 grating. U-shaped spring pieces are embedded at both ends of the groove as positioning points, and the locking position is referenced to the alignment coordinates of the two fishtail postures in S4.

[0030] S4: Pull-out triggers 3D dynamic switching. When the inner box is fully pushed in, the lenticular lens covers the right-side pattern, revealing the left-side view. The front spring engages and confirms the position, creating a 3D effect of the fish tail swinging forward. When pulled out to the outer stop, the lenticular lens covers the left side, revealing the right side, and the rear spring engages, creating a backward swinging posture. Continuous pushing and pulling utilizes visual persistence to create a non-electrically driven 3D rocking animation of a double-tailed fish.

[0031] S5: Adjustment of feel and feedback integration. 0.2mm thick soft polyurethane pads are attached to the contact surfaces of the two spring contacts in S3 to produce a crisp "click" feel during positioning. At the same time, the push and pull force is controlled at 5-6N. Too much force will cause the view to shift if the positioning is too easy, while too much force will destroy the smooth feeling of the continuous tail swing in S4.

[0032] S6: 3D Ghosting Elimination and Depth Calibration. Use red and blue dual-color test strips to push and pull to observe color separation, and simultaneously fine-tune the horizontal gap of the slider, the grating etching depth, and the vertical offset of the pattern (±0.05mm). Repeatedly correct until there is no ghosting, no color crosstalk, and the three-dimensional effect is clear and natural.

[0033] In step S1, in order to create a three-dimensional depth suggestion, a gradient shadow layer needs to be added to the edge of each fish's tail, and the highlight points of the scales are shifted 0.3mm to 0.5mm in the direction of their respective swings. In this way, the tail in the left swing image looks like it is floating forward, while the tail in the right swing image looks like it is retracting backward.

[0034] In step S1, the two images must be attached side by side to the same reference plane of the inner box. Their spacing must strictly correspond to the period of the subsequent grating stripes. The left and right patterns are arranged alternately to provide a pair of switchable 3D view bases for the grating occlusion switching. A high-precision positioning mold is used during attachment to ensure that no misalignment occurs.

[0035] In step S2, a high-transparency acrylic sheet with a thickness between 1mm and 2mm is selected. A row of parallel light-blocking stripes is etched on the back of the sheet using a laser. The direction of the stripes must be completely parallel to the direction of the box's sliding movement; even a slight tilt will introduce moiré pattern interference visually. The width of a single light-blocking stripe is set to 1.0mm, and the light-transmitting gap between adjacent stripes is 1.8mm. This set of periodic values ​​directly depends on the pitch of the alternating left and right fish patterns in S1.

[0036] In step S2, the etching depth is first processed based on about one-third of the plate thickness, and a depth adjustment margin of ±0.1mm is actively left. This allows for fine-tuning of etching or filling in the final calibration stage, ensuring that the two fishtail patterns can be reliably and alternately masked by these stripes during the pull-out displacement.

[0037] In step S3, a trapezoidal cross-section protruding slider is fixed to each of the two outer walls of the inner box. The cross-section of the slider, which is narrower at the top and wider at the bottom, can limit the amount of shaking of the inner box in the slide. Two straight rectangular slides are milled into the inner wall of the red outer shell at the corresponding positions. The length of the slide is equal to the total width of three complete stripe cycles on the grating panel. This stroke can just cover one complete switch between the left and right views.

[0038] In step S3, a U-shaped spring is riveted to each end of the slide. The opening of the spring faces the direction of the slider's movement. When the inner box is pushed or pulled to the bottom, the slider will be squeezed into the spring and locked in place. The specific installation coordinates of the spring need to be determined through repeated trial assembly. At the moment the spring is locked when pushed to the bottom, the grating must be exactly aligned with the left swing pattern, and when pulled out to the end point, it should be aligned with the right swing pattern. The positioning accuracy is ultimately calibrated by adjusting the elongation of the spring's riveting hole.

[0039] In step S4, after the inner box is fully pushed into the outer shell, the light-blocking stripes on the grating panel precisely block the right-swinging fish image, leaving only the lines of the left-swinging fish image visible through the light-transmitting gap. Simultaneously, the U-shaped spring at the front falls into the slider notch, providing a clear sense of segmentation. At this point, the parallax signal of the fish tail moving forward and the shadows projecting forward creates a three-dimensional effect of the fish tail swinging outward. Pulling the inner box outward to its end point causes the grating stripes to switch to blocking the left-swinging fish image while revealing the right-swinging fish image. The spring at the rear also engages simultaneously, causing the fish tail's highlights to recede and the shadows to indent, forming a posture of the tail swinging back. By continuously pushing and pulling the inner box, the user experiences alternating visual stimulation of the two angles at intervals of tens of milliseconds. Through visual persistence, this visual stimulation merges into a continuous three-dimensional animation of a two-tailed fish swaying in the mind. The entire process requires no electricity.

[0040] In step S5, a 0.2mm thick soft polyurethane gasket is adhered to the surface where the U-shaped springs at both ends of the slide directly contact the slider using pressure-sensitive adhesive. This gasket absorbs the impact energy of the metal parts, causing a sound and tactile feedback when the slider engages the positioning point. Simultaneously, the resistance to pulling is checked, stabilizing the force required for pushing and pulling between 5N and 6N. This force value is approximately equal to the resistance felt when lightly pushing a standard lighter pulley. If the resistance is below this range, the inertia of the inner box may easily break through the spring positioning, causing misalignment between the grating and the fish pattern, resulting in residual ghosting. If the resistance is too high, the continuous pushing and pulling rhythm will be interrupted, disrupting the smoothness of the fish tail's movement.

[0041] In step S6, prepare a set of red and blue dual-color test patterns. Print the fish pattern on the left in red and the fish pattern on the right in blue. Attach them to the corresponding positions on the inner box and observe them by pushing and pulling through the grating. If the red and blue shadows overlap at some point along the movement path, it indicates that the grating is simultaneously revealing the left and right patterns, causing color crosstalk. At this point, three parameters need to be adjusted in tandem: reduce the lateral clearance between the slide and the slider to eliminate swaying during inner box movement; use the 0.1mm depth allowance reserved in step S2 to perform secondary laser subtraction or fill with transparent resin to correct the obscuring angle of the grating stripes; and apply a slight offset of ±0.05mm to the pattern bonding surface in the vertical direction to change the relative position of the light-transmitting gap and the pattern lines. Repeat these three adjustments until only a single, pure fish shadow is presented throughout the entire pushing and pulling stroke, and the three-dimensional depth of the fish tail's outward and inward extension is stable and natural.

[0042] In this invention, two fish with oppositely swaying tails are printed side-by-side on the inner box. One fish's shadow projects outwards and its highlight moves forward, while the other's shadow is the opposite, creating a slight parallax. The back of the transparent window on the outer shell is engraved with equally spaced light-blocking stripes. When the inner box is pushed in, the stripes block the right-swaying image, revealing only the left-swaying image; when pulled out, the stripes reverse, revealing only the right-swaying image. With each push and pull, the two images of fish tails with varying depths are rapidly and alternately presented to the eyes. The brain, through visual persistence, automatically merges them into a 3D animation of a tail swaying back and forth. The entire process relies entirely on the physical blocking of the lenticular lens and the human eye's depth perception, requiring no batteries, screens, or any electronic components. Used on packaging, this dynamic pattern instantly brings static printed materials to life. Consumers trigger the fish tail swaying effect simply by opening the packaging or handling the inner box, making it more eye-catching on shelves than traditional static printing. The crisp feel of the positioning springs during pushing and pulling also enhances the sense of quality, adding interactive fun and strong visual memorability to the packaging at a very low cost.

[0043] The positioning springs and damping adjustments during the pull-out process create a smooth and tactile feel, enhancing the user's perception of product quality. The crisp tactile sensation each time the pull-out reaches its destination becomes a memorable feature. The 3D parallax effect creates depth through the shifting of shadows and highlights in the fishtail pattern. The tail-wagging animation seen through the lenticular lens is clean and clear, without ghosting or blurring. Printed materials thus possess a three-dimensional quality similar to lenticular cards, but are more scratch-resistant and less prone to wear over long-term use. For packaging designs that need to highlight visual concepts such as the ocean, freshness, and dynamism, this manually triggered, instantly presented dynamic display method upgrades packaging from a simple protective container into an interactive and engaging display medium, extending the time consumers spend handling and lingering with the product, thereby increasing its appeal and communicative power.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for dynamically displaying the shaking of a double-tailed fish in 3D based on pull-triggered motion, characterized in that: The method includes the following steps: S1: Draw two fish with completely overlapping body outlines, eyes, and fins, only with their tails swinging in opposite directions: one swinging to the left and the other to the right; add 0.3-0.5mm of shadow tones and scale highlight offsets to the tail of each fish to create parallax. S2: Take a high-transparency acrylic sheet and use a laser to etch a set of opaque stripes that are completely parallel to the pulling direction on the back. The stripes are 1.0mm wide and 1.8mm apart, and the period is precisely matched with the alternation pitch of the double fish pattern in step S1. S3: Trapezoidal raised sliders are installed on both sides of the inner box, and a straight rail groove is opened on the inner wall of the outer shell. The length of the groove is the total width of three stripe periods of the S2 grating. U-shaped spring pieces are embedded at both ends of the groove as positioning points. The locking position refers to the alignment coordinates of the two fish tail postures in S4. S4: When the inner box is fully pushed in, the grating covers the right-side pattern and reveals the left-side view. The front spring clip is locked in place, and the fish tail presents a three-dimensional effect of swinging forward. When pulled out to the outer end, the grating covers the left side and reveals the right side. The rear spring clip is locked, presenting a backward swinging posture. S5: Attach 0.2mm thick soft polyurethane gaskets to the contact surfaces of the two spring contacts at S3 to produce a light and crisp feel during positioning, while controlling the push-pull force to 5-6N; S6: Use red and blue dual-color test strips to push and pull to observe color separation, and simultaneously fine-tune the horizontal gap of the slider, the grating etching depth and the vertical offset of the pattern, repeatedly correcting until there is no ghosting, no color crosstalk, and the three-dimensional effect is clear and natural.

2. The method for dynamic shaking 3D display of a double-tailed fish based on pull-triggered motion as described in claim 1, characterized in that: In step S1, in order to create a three-dimensional depth suggestion, a gradient shadow layer needs to be added to the edge of the tail of each fish, and the highlight points of the scales are shifted 0.3mm to 0.5mm in their respective swinging directions, so that the tail of the left swinging image looks like it is floating forward, while the tail of the right swinging image looks like it is retracting backward.

3. The method for dynamic shaking 3D display of a double-tailed fish based on pull-triggered motion as described in claim 1, characterized in that: In step S1, the two images are ultimately attached side by side to the same reference plane of the inner box, and the spacing must strictly correspond to the period of the subsequent grating stripes. The left and right patterns are arranged alternately to provide a pair of switchable 3D view bases for the grating occlusion switching.

4. The method for dynamic shaking 3D display of a double-tailed fish based on pull-triggered motion as described in claim 1, characterized in that: In step S2, a high-transparency acrylic sheet with a thickness between 1mm and 2mm is selected, and a row of parallel light-blocking stripes is etched on the back of the sheet using a laser. The direction of the stripes must be completely parallel to the direction of the box being pulled out. The width of a single light-blocking stripe is set to 1.0mm, and the light-transmitting gap between adjacent stripes is 1.8mm.

5. The method for dynamic shaking 3D display of a double-tailed fish based on pull-triggered motion as described in claim 1, characterized in that: In step S2, the etching depth is first processed based on one-third of the plate thickness, and a depth adjustment margin of ±0.1mm is actively left.

6. The method for dynamic shaking 3D display of a double-tailed fish based on pull-triggered motion as described in claim 1, characterized in that: In step S3, a trapezoidal cross-section protruding slider is fixed on each of the two outer walls of the inner box. The cross-section of the slider, which is narrow at the top and wide at the bottom, can limit the amount of shaking of the inner box in the slide groove. Two straight rectangular slide grooves are milled on the inner wall of the red outer shell at the corresponding positions. The length of the slide groove is equal to the total width of three complete stripe periods on the grating panel.

7. The method for dynamic shaking 3D display of a double-tailed fish based on pull-triggered motion as described in claim 1, characterized in that: In step S3, a U-shaped spring is riveted to each end of the slide. The opening of the spring faces the direction of the slider's movement. When the inner box is pushed or pulled to the bottom, the slider will be squeezed into the spring and locked by it.

8. The method for dynamic shaking 3D display of a double-tailed fish based on pull-triggered motion as described in claim 1, characterized in that: In step S4, after the inner box is completely pushed into the outer shell, the light-blocking stripes on the grating panel will precisely block the right-swinging fish image, and only the lines of the left-swinging fish image will be revealed through the light-transmitting gap. At the same time, the U-shaped spring at the front end falls into the slider notch. At this time, the parallax signal of the highlight moving forward and the shadow being thrown forward on the fish tail creates a three-dimensional effect of the fish tail swinging outward. Pull the inner box outwards to the end of the stroke, and the grating stripes will then block the left-swinging fish image and reveal the right-swinging fish image. At the same time, the spring at the rear end will also engage, and the highlight of the fish tail will recede and the shadow will shrink, forming a posture of the tail swinging back. The inner box is pushed and pulled repeatedly, and the two angles of the image alternately stimulate the eyes at intervals of tens of milliseconds. With the help of visual persistence, they merge in the mind to form an animation of a two-tailed fish continuously shaking in three dimensions.

9. The method for dynamic shaking 3D display of a double-tailed fish based on pull-triggered motion as described in claim 1, characterized in that: In step S5, a soft polyurethane gasket with a thickness of 0.2mm is pasted on the surface of the U-shaped spring sheet at both ends of the slide groove that directly contacts the slider. This gasket can absorb the impact energy of the metal parts, so that the slider can make a sound when it is stuck into the positioning point, thus forming tactile feedback.

10. The method for dynamic shaking 3D display of a double-tailed fish based on pull-triggered motion as described in claim 1, characterized in that: In step S6, a set of red and blue dual-color test patterns is prepared. The fish pattern on the left is printed in red and the fish pattern on the right is printed in blue. After being pasted in the corresponding position on the inner box, the pattern is observed by pushing and pulling through the grating.

Images