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In about cellular phone use in cell phone case and functional + walking dangerousness improvement,
The smart phone circumferential evil tax frost which has the function of range of vision security of the user
It respects the convenient characteristic of the user from the cellular phone case problem solution
It emphasizes a carrying result use characteristic,
Smart phone -> electrical component of high price -> cellular phone case necessity
Cellular phone case -> dangerous exposure improvement of user -> ((Z, lenz))
It uses to as usual with the mirror,
It uses the refraction of the light,
There is a possibility of seeing the front.
Chungju National Univ.
Chungju-si, South Korea
Chungju National Univ.
Asan-si, South Korea
Hwang yeong hak