Non-contact position sensing device and non-contact position sensing method

摘要

A non-contact position sensing device includes a plurality of infrared LEDs provided in different positions and each being configured to transmit an infrared light ray, a photosensor configured to receive multiple ones of infrared light rays reflected by an object, and a control section configured to calculate a position of the object based on reflected light rays received by the photosensor. The control section switches between intensity position calculation to calculate the position of the object based on intensities of the reflected light rays and phase position calculation to cause intensities of the infrared light rays transmitted from the infrared LEDs to periodically change and calculate the position of the object based on phases of intensity changes of the reflected light rays.