Abstract
The phenomenon that is the rapid falling in the price of digital consumer electronic products is significant. It can also be assumed that the digital consumer electronics technology value falls rapidly, so I analyzed the phenomenon by using the patent data compared with the analog consumer electronics technology and the home appliance goods technology. The results showed the life spans of digital electronics patents are longer than those of analog and home appliance patents, and the estimated value decreasing speeds are different by life spans and by citations. This was in contrary to the assumption that had been made. It can be considered that the "modularization" makes the life spans of the digital consumer electronics patents longer and the technology span shorter, and the oligopoly of the development makes the life spans of the home appliances technology patents shorter and the spans of home appliances technology longer.
