The lawyer believed that the prototype's infrared angle sensor may be a patent infringement, so Yan, accepting the lawyer's opinion, was forced to scrap his entire scheme and start over. He switched to using an infrared parallel emission sensor that anyone can use.
律師認為只要牽涉到紅外線角度反射，都有侵犯專利之嫌，燕成祥只好將開好的模具全部丟掉，重新來過，並接受律師建議，改採所有廠商都可使用的紅外線平行發射感測器。