Mitsubishi Denki Kabushiki Kaisha

Kouichi Taketoshi

Ikuo Musa

Michiyasu Nounen

Yasuyuki Akama

Yoshihiro Uragata

An improved photoelectric switching device for coordinate detection system comprises a first array of light emitting elements, a first array of photo-detecting elements for receiving the light from the first array of light emitting elements and producing a first block signal when the light is blocked by a stylus, such as a finger, a second array of light emitting elements, a second array of photo-detecting elements for receiving the light from the second array of light emitting elements and producing a second block signal when the light is blocked by the stylus wherein the light receiving surfaces of the second array of photo-detecting elements are aligned an angle, such as 180 degrees, with respect to those of the first array of photo-detecting elements, and a control means such as a microcomputer for driving the first and the second array of the light emitting elements and for discriminating the coordinates of the stylus on the display unit which displays a pattern having several regions allocated for certain control of optional equipment. Therefore, the stylus can be detected even if there is an inadvertent operation in either of the first and the second photo-detecting elements due to a strong incidence of ambient light in the lateral direction.

Photoelectric switch

An automotive navigation system wherein a memory included therein has not stored therein picture information of an actual map, but instead has stored therein geographical names and the geographical positions thereof. When the geographical names of a departure point, a destination point and one or more passing points are entered through an input unit, a control circuit reads out the respective positions of the points from the memory. The control circuit controls a display unit to display on a display screen marks respectively indicating two or more of the points and the current position of a vehicle.

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Hyogo, Japan

Kouichi Taketoshi