Technically, I suppose, it’s two curved sensors. But, one of them can actually be bent and have the curve adjusted at will. At least, that’s how it seems if I’m reading this right. The reasons for these curved sensors seem to cite primarily technical and practical benefits of a curved sensor. One that can be bent at the user’s behest, though, opens up a whole host of potentially cool and interesting creative options for the future of photography.
The first patent, filed in April 2015 was published a couple of weeks ago. It shows a fixed curved sensor. If Google’s translation is any good, Egami seem to suggest that this is designed to help reduce vignetting issues. But, each lens presents vignetting in a slightly different way, so I think it’s likely that this design is with a specific lens in mind. Perhaps some type of compact camera, or even a cellphone.