Matsushita Electric Industrial Co., Ltd.

Matsushita Electronics Corporation

Michiaki Watanabe

Mitsunori Yokomakura

Hideo Suzuki

Yoshikazu Demi

Hiroshi Aono

Toshifumi Nakatani

Koji Akiyama

Hideo Kurokawa

Kanji Imai

Mitsunori Katano

Tomohiro Sekiguchi

Takatsugu Kurata

Yuichi Moriyama

Makoto Kawachi

Keiji Nagata

Kenji Fujishiro

Toshinobu Sekihara

Shigeru Ohki

Yasuhiko Sakai

A cathode ray tube includes an electron gun for emitting at least one electron beam; a mask frame include a mask having a plurality of holes or slits for allowing the electron beam to be transmitted therethrough and a frame to which the mask is attached; and a panel including a phosphor layer to be scanned by the at least one electron beam transmitted through the plurality of holes or slits of the mask. The panel includes a plurality of stud pins for supporting the frame. The frame includes a plurality of elastic supports engaged with the plurality of stud pins. At least one of the plurality of elastic supports includes an engagement portion having an engaging hole which is engaged with one of the plurality of the stud pins and an elastic portion in contact with the one stud pin. Mask frame vibration causes the elastic portion to rub against a respective stud pin so as to generate a frictional force for attenuating the vibration of the mask frame.

Cathode-ray tube and image display comprising the same

An elastic support member or an elastic support member-holding plate is located substantially in the middle portion of a frame portion ( and ), and a shadow mask is constructed such that a tension in the middle portion of the shadow mask is larger than the tension in the edge portions of the shadow mask . In another aspect, a plurality of elastic support members are such that at least two elastic support members having substantially different spring constants are combined.

Cathode ray tube and image display apparatus using the same

A color cathode-ray tube that can attenuate vibration of an entire shadow mask positively with a simple structure. The color cathode-ray tube includes a frame-shaped mask frame and a shadow mask in which many apertures are formed in a flat plate, the shadow mask being stretched and fixed in the mask frame in a condition in which a tension force is applied in one direction. The amplitude in the end portions of the shadow mask is not less than a certain amount relative to the amplitude in the center portion of the shadow mask, in a resonance of the shadow mask caused by a vibration propagated to the color cathode-ray tube. Furthermore, by providing vibration attenuators at the end portions of the shadow mask, vibrations at the end portions of the shadow mask are attenuated as the side surfaces of the shadow mask slide on the vibration attenuators. Thus, vibration of the entire shadow mask can be extinguished positively.

Color CRT having shadow mask with vibration attenuator

The present invention provides a color cathode-ray tube that can attenuate vibration of an entire shadow mask positively with a simple structure. The color cathode-ray tube comprises a frame-shaped mask frame and a shadow mask in which many apertures are formed in a flat plate, the shadow mask being stretched and fixed in the mask frame in a condition in which a tension force is applied in one direction. The amplitude in the end portions of the shadow mask is not less than a certain amount relative to the amplitude in the center portion of the shadow mask, in a resonance of the shadow mask caused by a vibration propagated to the color cathode-ray tube. Furthermore, by providing vibration attenuators at the end portions of the shadow mask, vibrations at the end portions of the shadow mask are attenuated as the side surfaces of the shadow mask slide on the vibration attenuators. Thus, vibration of the entire shadow mask can be extinguished positively.

Color cathode-ray tube with shadow mask and frame

A color cathode-ray tube that can attenuate vibration of an entire shadow mask positively with a simple structure. The color cathode-ray tube includes a frame-shaped mask frame and a shadow mask in which many apertures are formed in a flat plate, the shadow mask stretched and fixed in the mask frame in a condition in which a tension force is applied in one direction. The amplitude in the end portions of the shadow mask is not less than a certain amount relative to the amplitude in the center portion of the shadow mask, in a resonance of the shadow mask caused by a vibration propagated to the color cathode-ray tube. Furthermore, by providing vibration attenuators at the end portions of the shadow mask, vibrations at the end portions of the shadow mask are attenuated as the side surfaces of the shadow mask slide on the vibration attenuators. Thus, vibration of the entire shadow mask can be extinguished positively.

Color crt having shadow mask with vibration attenuator

In an image display apparatus comprising a fluorescent layer formed on the inner surface of a vacuum container, an electron emission source, and a supporting member sandwiched between the fluorescent layer and the electron emission source so that the fluorescent layer and the electron emission source are kept in parallel, a displacement preventing system is provided to prevent displacement of the electron beams emitted from the electron sources caused by the charging of the supporting member. More specifically, the supporting member may be composed of an insulating portion contacting with the electron emission source and a conducting portion contacting with the fluorescent layer. An electrode portion may be provided between the insulating portion and the conductive portion. Electron sources are arranged on the insulating substrate so that the electron beams emitted from the electron sources will be landed on the fluorescent layer with an equal pitch. The vacuum container provided with the supporting members can resist the atmospheric pressure and the supporting members will not affect adversely the images, and therefore good images can be obtained.

Image display apparatus

An image display apparatus includes a vacuum container whose inside is kept under vacuum, a fluorescent layer, an electron emission source having an electron source which is arranged in a matrix and electrodes having a function for focusing and deflecting electron beams, and the fluorescent layer is illuminated by the electron beam. The average electric field strength between the fluorescent layer and the electrodes is set to be stronger than that between the electrodes and the electron emission source. Consequently, electron beams can be deflected in predetermined directions, and electron beams that land on the fluorescent layer can be focused to be a predetermined size. As a result, electron beams can be landed exactly at predetermined positions of the fluorescent layer having an arrangement whose number is more than the number of the electron emission source, and an image display apparatus having high resolution can be provided.

Image display apparatus with focusing and deflecting electrodes

A substantially rectangle shaped frame for holding a flat-shaped electrode unit 7 is fixed to a rear panel 2 at four intermediate parts of the frame and is elastically held by a resilient retaining member 55a- - - 55d and 56a- - - -56d at four corners of the frame. Thereby, an engagement between the rear panel 2 and the flat-shaped electrode unit 7 via the frame is stably retained regardless of difference in degrees of deformations thereamong.

Flat type image display apparatus and fabrication method therefor

A substantially rectangle shaped frame for rigidly affixing a flat-shaped electrode unit to a rear panel at intermediate parts of the frame and elastically attaching the frame to the rear panel by a resilient retaining member at four corners of the frame, thereby, stabilizing an engagement between the rear panel and the flat-shaped electrode unit via the frame regardless of difference in degrees of deformations thereamong.

Elastic restraint for flat panel displays

In an image display apparatus, horizontal-extended line cathodes (22a-22d), an electron beam extraction electrode (23), a control electrode (24), a first focusing electrode (25) having horizontal-elongated apertures (35, 45), a second focusing electrode (26) having vertical-elongated apertures (36, 46), a horizontal deflection electrode (27a, 27b), a vertical deflection electrode (28a, 28b) and a screen (29) are provided in this order toward a travelling direction of electron beam, and each of both deflection electrodes comprises a pair of comb-shaped conductive sheets which are insulatedly interdigitated with each other on the same vertical plane.

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Ibaraki, Japan

Michiaki Watanabe