Abstract: A coil assembly for non-contact charging has a power supplying surface facing a power receiving device and is provided in a power transmission device which wirelessly transmits power to the power receiving device. The coil assembly includes: a first coil; a second coil which is positioned as close as or farther than the first coil from the power supplying surface; and a magnetic body which is positioned farther than the second coil from the power supplying surface, and overlaps with the second coil and does not overlaps with the first coil when seen from the power supplying surface.

Abstract: A coil assembly for non-contact charging has a power supplying surface facing a power receiving device and is provided in a power transmission device which wirelessly transmits power to the power receiving device. The coil assembly includes: a first coil; a second coil which is positioned as close as or farther than the first coil from the power supplying surface; and a magnetic body which is positioned farther than the second coil from the power supplying surface, and overlaps with the second coil and does not overlaps with the first coil when seen from the power supplying surface.

Abstract: A photodetection device has a light passing part in an upper portion, a light guiding member, and a photodetection element in a lower portion. Light passing through the light passing part is guided by the light guiding member to be detected by the photodetection element. The light guiding member has an incident curved surface provided annularly around a central axis on a side of the light passing part, and a reflective curved surface provided around the central axis inside the incident curved surface so as to be opposed to the incident curved surface. The light guiding member reflects light at the reflective curved surface to guide the light to a light receiving surface of the photodetection element, the light passing through the light passing part and entering the incident curved surface at a predetermined inclination angle.

Abstract: A photodetection device has a light passing part in an upper portion, a light guiding member, and a photodetection element in a lower portion. Light passing through the light passing part is guided by the light guiding member to be detected by the photodetection element. The light guiding member has an incident curved surface provided annularly around a central axis on a side of the light passing part, and a reflective curved surface provided around the central axis inside the incident curved surface so as to be opposed to the incident curved surface. The light guiding member reflects light at the reflective curved surface to guide the light to a light receiving surface of the photodetection element, the light passing through the light passing part and entering the incident curved surface at a predetermined inclination angle.

Abstract: A navigation system can indicate a relationship in position between a main vehicle and a related vehicle without reducing a map picture on a display unit. A second display unit (6a) is provided independently of a first display unit (3a) for a map picture in a navigation system. The second display unit (6a) indicates a position of the related vehicle by means of a direction (11) relative to the main vehicle and a distance (12) from the main vehicle to the related vehicle. Preferably, the direction (11) and distance (12) are indicated by an arrow or characters and by digits, respectively. This makes the display obvious.