Birthday Cake 3D Pop-Up Card with Music

This musical birthday card turns a familiar cake-and-candle theme into an interactive product for branded greeting card collections. A layered chocolate cake rises from the blue fireworks background, with “HAPPY BIRTHDAY” lettering built directly into the display. When the card opens, the candle lights up and the birthday music begins. Blowing toward the candle switches off the light and changes the audio to cheering or fireworks sounds. For wholesalers and card brands, this combination of paper engineering, sound and responsive lighting adds a higher-value option to a range of Musical Birthday Cards without making the product difficult for the recipient to use.   HPScard develops the electronic layout and 90-degree paper structure as one complete design. Space for the speaker, battery, music chip, LED and blow sensor is planned around the cake layers, allowing the card to open smoothly and stand securely. This is important when producing Light Up Birthday Cards in volume, because…

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