Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Tetsuro Ozawa

Shigeo Nakatera

Ryuichi Murai

Hiroshi Iwamoto

Tomohisa Mikami

Shin-ichiro Hatta

Shinichiro Hatta

Hideo Iguchi

Hideharu Omae

Yoshimi Kumei

Yoko Kannan

Naoki Yamauchi

Takayuki Yonezawa

The present disclosure relates to a method for disassembling a plasma display device including PDP () having front plate () and rear plate (), metal support plate () bonded to rear plate () of PDP () with bonding member () interposed therebetween, and circuit board () attached to metal support plate (). The method includes performing irradiation with infrared rays from a side of front plate () constituting PDP () while air is sent to circuit board () attached to metal support plate () to heat bonding member () between PDP () and metal support plate () so as to decrease bonding strength, and then separating PDP () from metal support plate ().

Method for disassembling plasma display device

A cathode ray tube is provided, in which the flatness of a tension mask constituting a color-selection mechanism is maintained by a suitable stretching force, while with the tension mask, the influence of external magnetic fields, such as the terrestrial magnetism is suppressed, and the shifting of the electron beam is reduced. A tension mask made of a magnetostrictive material is used, the tension mask is stretched by a stretching force in a range maintaining the flatness of the tension mask, and the direction and strength of the stretching force are set such that vertical magnetic permeability of the tension mask increases, due to a magnetoelastic effect caused by the stretching force in the magnetostrictive material of the tension mask.

Cathode ray tube tension mask made of magnetostrictive material with compensation for terrestrial magnetism

In a cathode ray tube including a panel provided with a phosphor screen, a funnel integrated with the panel, an electron gun disposed inside the funnel, a magnetic shield () for shielding an electron beam () emitted from the electron gun against an external magnetic field, and a frame () for holding the magnetic shield (), the magnetic shield () includes, at a portion to be joined with the frame (), a bent portion () bent toward a tube axis side, and a thickness T of the bent portion () at its edge on the tube axis side is 0.08 mm or less. By making the thickness T small, halation that is liable to occur in a cathode ray tube with a large deflection angle can be suppressed because electron beams reflected from an end face () and allowed to reach the screen without being shielded by the frame () are reduced.

Cathode ray tube having magnetic shield with a bent portion

A color cathode-ray tube apparatus having: a glass bulb including a face panel, a funnel, and a neck; a deflection yoke attached to the funnel to surround thereof; and a color-selection electrode disposed inside the face panel. A pair of degaussing coils are wound around the upper and lower portions of the glass bulb, respectively. A loop coil, which is disposed around the glass bulb between the color-selection electrode and the deflection yoke, includes: a first portion including two extending portions of the loop coil positioned over and below the glass bulb respectively, each center of the extending portions being substantially in a plane perpendicular to a tube axial of the glass bulb; and a second portion including two bent portions that are formed by bending right and left sides of an original form of the loop coil toward the neck.

Cathode-ray tube, cathode-ray tube apparatus, image display apparatus, and coil unit

A color cathode ray tube having a striped phosphor screen is provided, in which color displacements due to the tube axis (Z-axis) component of the terrestrial magnetism can be decreased at low cost. A positive temperature coefficient thermistor and a degaussing coil are connected in series to an AC power source (AC 100V) via a switch. A rectifier/smoothing circuit is provided in parallel to the positive temperature coefficient thermistor. When the switch is turned on, an ordinary degaussing process due to the AC attenuating magnetic field interlinked to the degaussing coil is performed, and the DC magnetic field in the Y-axis direction interlinked to the degaussing coil decreases the influence of the terrestrial magnetism in the tube axis direction (Z-axis direction).

Color cathode ray tube having DC magnetic field during degaussing process

A cathode ray tube including an internal magnetic shield in the shape of a hollow rectangular frustum including two long sides opposite to each other and two short sides opposite to each other, having an opening at its top and bottom attached to a mask and a frame. Each long side has a long side extension at a horizontal center located at the top of the internal magnetic shield where an electron beam enters the internal magnetic shield. The long side extensions enable the magnetic shield to reduce the deviation of an electron beam within the magnetic shield caused by an external magnetic field such as that caused by terrestrial magnetism.

Growing community of inventors

Ibaraki, Japan

Tetsuro Ozawa