Hitachi, Ltd.

Shin Meiwa Industry Co., Ltd.

Yasushi Ihara

Kenichi Onisawa

Tetsuro Minemura

Yasuhiro Koizumi

Isao Tokomoto

Kouichi Nose

Akira Katou

Kazuo Uetani

Shiro Takigawa

A plasma display panel (PDP), consisting of a front panel ( ) equipped with display electrodes ( ) and a rear panel ( ) equipped with address electrodes ( ), that displays an image by causing discharge in a small discharge space formed between the two panels; wherein there are provided two layers of protective films ( ), made of metallic oxide, covering the dielectric layer ( ) installed on the front panel ( ); the outer, upper layer ( ) being formed into a layer of material with a specific surface area of 20 m /g or more and a film thickness of 1 &mgr;m or less, exhibiting a high discharge characteristic; and the inner, lower layer ( ) being formed into a layer of material with a specific surface area of 10 m /g or less and a film thickness of 1 &mgr;m or more, exhibiting a low water-adsorption characteristic.

Plasma display panel

There is provided a plasma display panel (PDP), consisting of a front panel ( ) equipped with display electrodes ( ) and a rear panel ( ) equipped with address electrodes ( ), that displays an image by causing discharge in a small discharge space formed between the two panels; wherein there are provided two layers of protective films ( ), made of metallic oxide, covering the dielectric layer ( ) installed on the front panel ( ); the outer, upper layer ( ) being formed into a layer of material with a specific surface area of 20 m /g or more and a film thickness of 1 &mgr;m or less, exhibiting a high discharge characteristic; and the inner, lower layer ( ) being formed into a layer of material with a specific surface area of 10 m /g or less and a film thickness of 1 &mgr;m or more, exhibiting a low water-adsorption characteristic.

An automatic welding apparatus includes a movable welding torch carried by a positioning assembly mounted on a pair of turn frames adapted to be rotated about a horizontal axis. The positioning assembly is capable of orienting the welding torch with respect to a workpiece holder also mounted on the pair of turn frames. A computer control arrangement accurately positions the torch along three mutually orthogonal axes during welding, and controls the angular position of the pair of turn frames about the horizontal axis. In alternative embodiments, the workpiece holder is mounted on a pair of stationary stands so that the holder is independently rotatable around a horizontal axis which may be coincident with, or offset from, the axis of rotation of the turn frames. The arrangement permits automatic torch positioning for downward butt welding or horizontal fillet welding on the interior or exterior of long box-like or tubular members.

Automatic welding apparatus

Growing community of inventors

Takarazuka, Japan

Yasushi Ihara