Nec Corporation

Nichia Chemical Industries, Limited

Yojiro Kondo

Masato Hayashi

Fumio Yamauchi

Katsunori Uchimura

Tokuki Miura

Yasuhiro Mano

Masaki Mori

Yosinori Hirai

Rikuo Sakaguchi

Masayuki Usui

Kazuo Kaneko

Osamu Yamasita

Hidehito Mori

Kenichi Ishidate

Toshihiko Ayusawa

Yasuhiro Wasa

On manufacturing a low voltage electron beam excitation phosphor display apparatus (10) which includes an anode (6) having a principal surface and enclosed in a vacuum chamber (1, 2, and 3), a phosphor film (7) formed on the principal surface, and a cathode (9) enclosed in the vacuum chamber opposite to the phosphor film, a phosphor is prepared which consists essentially of an oxisulfide and an oxide which is inevitably formed on a surface of the oxisulfide on preparing the phosphor. The oxisulfide is represented by Ln.sub.2 O.sub.2 S:R, where Ln is at least one selected from a group consisting of Gd, La, Y, and Lu and where R is a rare-earth element. The oxide is removed from the phosphor to produce an oxide-removed phosphor. A pasts comprising a mixture of the oxide-removed phosphor, a conductive material, and an autolytic type binder is coated on the principal surface of the anode which is formed on an insulating substrate (1) constituting the vacuum chamber. The binder of the paste is heated in a nonoxidizing atmosphere to form, on the principal surface of the anode, the phosphor film which has the oxide-removed phosphor and the conductive material. The anode and the cathode are enclosed in the vacuum chamber to obtain a manufactured low voltage electron beam excitation phosphor display apparatus. The oxide may be Ln.sub.2 O.sub.3 into which a component Ln.sub.2 O.sub.2 S of the oxisulfide is changed.

Low voltage electron beam display apparatus having brightness increased

An unmanned vehicle guide system has guide routes made of a magnetic material and an unmanned vehicle guided to travel on the guide route. The unmanned vehicle has an exciting coil for emitting a magnetic field, a pair of detection coils, arranged in a direction perpendicular to the travel direction of the unmanned vehicle, for detecting a magnetic field change, a comparator for measuring an output-difference between the detection coils, and a steering device for steering the unmanned vehicle such that the output-difference becomes a predetermined value. At an intersection where a plurality of guide routes intersect and in the vicinity thereof, at least one guide route lacks a magnetic material. Alternatively, an extra marker is added to each of the guide routes that intersect at the intersection.

Unmanned vehicle guide system

An improved magnetic object detecting system having high sensitivity and noise immunity is disclosed. The detection system is of the type having a stimulation coil for generating a magnetic field and a pair of magnetic field detection coils, and the stimulation coil is of a magnetic core type employing a magnetic core.

Magnetic object detecting system for automated guided vehicle system

Growing community of inventors

Tokyo, Japan

Yojiro Kondo