Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: A package structure and a formation method of a package structure are provided. The method includes disposing a chip structure over a substrate. The chip structure has an inclined sidewall, the inclined sidewall is at an acute angle to a vertical, the vertical is a direction perpendicular to a main surface of the chip structure, and the acute angle is in a range from about 12 degrees to about 45 degrees. The method also includes forming a protective layer to surround the chip structure.

Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: A foot sole stimulation device includes a plate with stimulators on a top surface of the plate and arranged in a specific form. The stimulators are solid semi-circular balls with radius of 1.5 mm to 2.5 mm and arranged in a square matrix. A distance between the centers of adjacent rows and columns of the stimulators is 7 mm to 11 mm, and a distance between the closest peripheries of adjacent rows and columns of the stimulators is 4 mm to 6 mm. The device can be made as shoe soles, shoes or socks so as to provide gradual stimulation to the user who has problems of sense of balance. When users step on the stimulators, they compress and stimulate the skin to improve the ability of receptors in the sole of foot to detect change in different levels of mechanical stimulation. The device provides extra sensational information and information of the load allocations during standing, walking or turning so as to increase the ability of balance.