CARDRIDGE's business card ejection opening uses a ``clothoid curve'' compared to previous models. A clothoid curve, also known as a transitional curve or a Cornu spiral, is a curve used for tracks such as highways, railways, and roller coasters.It is a mysterious curve that gradually becomes steeper as it progresses. In the example above, it has functionality that is essential for the safe operation of cars and trains, but the main reason for incorporating it into the business card holder is ``beauty.''
The clothoid spiral is also known to depict the golden ratio. It is also called the ``human curve,'' and is said to express a human-like smoothness that cannot be expressed only with circles and straight lines. Of course, it has the functional advantage of being able to smoothly take out a business card from the open part, but the design is based on the desire to create a product that is more human-friendly by focusing on this curve rather than just creating a radius. It is contained in And that design is also followed by the dünn model.
Above all, the meaning of the name clothoid is wonderful. It is said to come from the Greek goddess Clotho, and the ``thread of destiny'' is drawn from a distaff in her hand. (Therefore, Clotho is said to be a "weaver.") We hope that CARDRIDGE and dünn can help increase the chances of connecting people.