Abstract: A method for calculating optical aerial images. The method includes following steps. A first pattern distribution in a spatial domain is multiplied by a scaling constant to scale the first pattern distribution to generate a second pattern distribution. A fast Fourier transform is performed on the second pattern distribution to generate a first spatial frequency spectrum distribution in a spatial frequency domain. The first spatial frequency spectrum distribution is multiplied by a pupil function to generate a second spatial frequency spectrum distribution. An inverse fast Fourier transform is performed on the second spatial frequency spectrum distribution to generate a first diffraction image distribution in the spatial domain. The first diffraction image distribution is divided by a scaling constant to scale the first diffraction image distribution to generate a second diffraction image distribution.

Abstract: A rear view system for a transportation device includes a rear view means, a sensor and a controller. The sensor is used for generating a movement signal according to the movement of the transportation device. The controller is used for controlling the rotation of the rear view means according to the movement signal. Moreover, a method for adjusting the visual angle of a rear view means equipped in a transportation device is also disclosed.

Abstract: A magnetic boot module is described. The magnetic boot module has a pair of magnetic boots, a pair of moving devices, and a magnetic inductive path. Each of the moving devices couples to one of the magnetic boots to transversely push the magnetic boots moving on the magnetic inductive path step by step. The magnetic inductive path is formed on a magnetic inductive plate or a magnetic inductive rail. The magnetic boot module further utilizes a position detecting device to sense a current position thereof.

Abstract: A magnetic boot module is described. The magnetic boot module has a pair of magnetic boots, a pair of moving devices, and a magnetic inductive path. Each of the moving devices couples to one of the magnetic boots to transversely push the magnetic boots moving on the magnetic inductive path step by step. The magnetic inductive path is formed on a magnetic inductive plate or a magnetic inductive rail. The magnetic boot module further utilizes a position detecting device to sense a current position thereof.

Abstract: The present invention provides for improved rearview mirror device for the use. Rearview mirror device of the present invention is likely to be particularly useful in ground vehicle, such as car or truck for better driving view since it automatically modifies the angle to provide a safety-view for driver during the vehicle turning. In one preferred embodiment, an automatic mirror angle modifying device comprises: a rearview mirror, which is supported on a vehicle body; an shaft rotation measurement device, which further includes a ring apparatus which surrounds the steering wheel shaft and a ring apparatus decoder; a microprocessor and a motor. While the steering wheel is rotating to indicate to vehicle body turning, the measuring device detects the shaft rotation angle. Then, according to the rotation angle, the microprocessor computes the best rear view angle and informs the motor to drive the mirror to an adequate position.