EP0523318A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Light-emitting device
Assignee: Mitsubishi Electric Corp
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Filing: 1992-03-16
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Granted: —
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Expires: 2012-03-16
Abstract
Abstract The present invention relates to a light emitting device which emits light upon impingement of thermoelectrons on a front panel having fluorescent elements. In each bonding surface of a spacer (3) which is bonded to both front (1) and rear (6) panels, a positional deviation or displacement of the spacer with respect to the front panel, the rear panel or a shielding electrode is prevented by emplying a stepped portion on said rear panel (6) fitting with said spacer (3), whereby there is obtained a light emitting device of high accuracy free of variations in luminance, and it is made possible to reduce a dead space between adjacent light emitting devices and thereby attain a display of high resolution. In order to obtain such display, the front panel and the spacer, as well as the rear panel and the spacer, are respectively bonded through premolded frit glass (21). Further embodiments include a method of fixing an anode by employing a plurality of elastic pieces on the outer periphery, said pieces being in contact with the inner side faces of the spacer and electrode leads having thermal expansion properties matched to the substrate and rear panel.
Inventors
- 👤 Sashiro Uemura
- 👤 Yoshiyuki Nishii
- 👤 Isamu Kanda
- 👤 Kazunori Tatsuda
- 👤 Yukiharu Seko
- 👤 Hiroshi Kamogawa
- 👤 Tokuhide Shimojyo
- 👤 Zenichiro C/O Mitsubishi Denki Kabushiki K. Hara
- 👤 Nobuo C/O Mitsubishi Denki Kabushiki K. Terazaki
- 👤 Shunichi C/O Mitsubishi Denki K. K. Futatsuishi
- 👤 Kozaburo C/O Mitsubishi Denki K. K. Shibayama
- 👤 Shuji C/O Mitsubishi Denki Kk. Ind. Elec. Iwata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 02:16
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/15; H01J29/00; H01J29/02; H01J29/08; H01J29/085; H01J29/86; H01J29/92; H01J31/123; H01J9/00; H01J9/24; H01J9/26; H01J9/261
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
99 words
A light emitting device including: a front panel on which fluorescent elements are arranged in a matrix form; a rear panel on which cathodes are arranged in a corresponding relation to said fluorescent elements, said cathodes emitting thermoelectrons for causing the fluorescent elements to emit light; and a square frame-like spacer, one opening portion of said spacer being covered with said front panel and the other opening portion thereof covered with said rear panel, characterized in that said front panel and said spacer, as well as said rear panel and said spacer, are respectively bonded through pre-molded frit glass.
Claim 2
Independent Claim
182 words
A method for fabricating a light emitting device including a front panel on which fluorescent elements are arranged in a matrix form, a rear panel on which cathodes are arranged in a corresponding relation to said fluorescent elements, said cathodes emitting thermoelectrons for causing the fluorescent elements to emit light, and a square frame-like spacer, one opening portion of said spacer being covered with said front panel and the other opening portion thereof covered with said rear panel, said method including the steps of: molding frit glass into a shape which permits the molded frit glass to be placed on each bonding surface of said spacer without protrusion from the bonding surface; assembling said rear panel, two frames of the molded frit glass, said spacer and said front panel in such a manner that one frit glass frame is placed between the rear panel and the spacer and the other placed between the front panel and the spacer; and heating the frit glass frames for bonding between said front panel and said spacer and also between said rear panel and said spacer.
Claim 3
Dependent Claim
100 words
A light emitting device including: a front panel on which fluorescent elements are arranged in a matrix form; a rear panel on which cathodes are arranged in a corresponding relation to said fluorescent elements, said cathodes emitting thermoelectrons for causing the fluorescent elements to emit light; and a square frame-like spacer, one opening portion of said spacer being covered with said front panel and the other opening portion thereof covered with said rear panel, characterized in that a stepped portion for fitting with said spacer is formed in a portion of said rear panel to be bonded with the spacer.
Claim 4
Independent Claim
139 words
A method for fabricating a light emitting device including a front panel on which fluorescent elements are arranged in a matrix form, a rear panel on which cathodes are arranged in a corresponding relation to said fluorescent elements, said cathodes emitting thermoelectrons for causing the fluorescent elements to emit light, and a square frame-like spacer, one opening portion of said spacer being covered with said front panel and the other opening portion thereof covered with said rear panel, said method including the steps of: forming a stepped portion for fitting with said spacer in a surface of said rear panel to be bonded with the spacer; applying frit glass to said spacer bonding surface; combining said rear panel and said spacer with each other; and heating said frit glass to effect bonding between said rear panel and said spacer.
Claim 5
Dependent Claim
129 words
A light emitting device including: a front panel on which fluorescent elements are arranged in a matrix form; a rear panel on which cathodes are arranged in a corresponding relation to said fluorescent elements, said cathodes emitting thermoelectrons for causing the fluorescent elements to emit light; an anode provided near said front panel to accelerate said thermoelectrons; and a square frame-like spacer, one opening portion of said spacer being covered with said front panel and the other opening portion thereof covered with said rear panel, characterized in that said anode is fixed to said front panel within the frame of said spacer and has a plurality of elastic pieces formed in the outer periphery thereof, said elastic pieces being in elastic contact with inner side faces of the spacer.
Claim 6
Dependent Claim
48 words
A light emitting device according to claim 5, wherein said anode has upright portions standing upright from the four sides of a quadrilateral plate, said upright portions each having two cuts made therein, and said elastic pieces are each formed by a portion defined by said two cuts.
Claim 7
Dependent Claim
33 words
A light emitting device according to claim 6, wherein the other upper side portion of each said upright portion than the portion defined by said two cuts is fixed to said front panel.
Claim 8
Independent Claim
211 words
A method for fabricating a light emitting device including a front panel on which fluorescent elements are arranged in a matrix form, a rear panel on which cathodes are arranged in a corresponding relation to said fluorescent elements, said cathodes emitting thermoelectrons for causing the fluorescent elements to emit light, an anode provided near said front panel to accelerate said thermoelectrons, and a square frame-like spacer, one opening portion of said spacer being covered with said front panel and the other opening portion thereof covered with said rear panel, said method including the steps of: performing half etching along straight lines drawn inside spacedly by a predetermined length from the four sides of a flat plate; making two cuts in each of said four sides; bending 90° the other portions of said flat plate than the portions each sandwiched in between said two cuts to form upright portions and bending each said portion sandwiched in between the two cuts at an angle smaller than 90°; fixing said upright portions to said front panel in the interior of said spacer; applying frit glass to a bonding surface of said spacer; combining said front panel with said spacer; and heating said frit glass to effect bonding between said front panel and said spacer.
Claim 9
Dependent Claim
137 words
A light emitting device including: a front panel on which fluorescent elements are arranged in a matrix form; a substrate on which cathodes are arranged in a corresponding relation to said fluorescent elements, said cathodes emitting thermoelectrons for causing the fluorescent elements to emit light, and said substrate being placed on a rear panel while being supported by control electrode leads drawn out from said cathodes; a shielding electrode provided between said front panel and said substrate to partially shield the flow of the thermoelectrons; and a square frame-like spacer, one opening portion of said spacer being covered with said front panel and the other opening portion thereof covered with said rear panel, characterized in that said shielding electrode has a plurality of elastic pieces which are in elastic contact with inner side faces of said spacer.
Claim 10
Dependent Claim
70 words
A light emitting device according to claim 9, wherein said shielding electrode has a square plate portion and also has faces extending from the four sides of said plate portion to isolate said substrate and the inner side faces of said spacer from each other, and said elastic pieces are projecting from a side of each said face opposite to a boundary side between said face and said plate portion.
Claim 11
Dependent Claim
151 words
A light emitting device including: a front panel on which fluorescent elements are arranged in a matrix form; a substrate on which cathodes are arranged in a corresponding relation to said fluorescent elements, said cathodes emitting thermoelectrons for causing the fluorescent elements to emit light, and said substrate being placed on a rear panel while being supported by control electrode leads drawn out from said cathodes; a shielding electrode provided between said front panel and said substrate to partially shield the flow of the thermoelectrons; and a square frame-like spacer, one opening portion of said spacer being covered with said front panel and the other opening portion thereof covered with said rear panel, characterized in that said shielding electrode has a plurality of elastic pieces which are in contact with the surface of said rear panel and also has faces positioned between said substrate and inner side faces of said spacer.
Claim 12
Dependent Claim
70 words
A light emitting device according to claim 11, wherein said shielding electrode has a square plate portion and also has faces extending from the four sides of said plate portion to isolate said substrate and the inner side faces of said spacer from each other, and said elastic pieces are projecting from a side of each said face opposite to a boundary side between said face and said plate portion.
Claim 13
Dependent Claim
39 words
A light emitting device according to claim 12, wherein said shielding electrode is composed of plural portions each of which has openings in a corresponding relation to a predetermined number of fluorescent elements out of all said fluorescent elements.
Claim 14
Dependent Claim
151 words
A light emitting device including a front panel on which fluorescent elements are arranged in a matrix form; a substrate on which cathodes are arranged in a corresponding relation to said fluorescent elements, said cathodes emitting thermoelectrons for causing the fluorescent elements to emit light; and a square frame-like spacer, one opening portion of said spacer being covered with said front panel and the other opening portion thereof covered with a rear panel. characterized in that there are provided first electrode leads having a thermal expansion coefficient equal to that of said substrate, said first electrode leads being inserted into said substrate to support the substrate and connected to control electrodes for said cathodes arranged on the substrate, and second electrode leads having a thermal expansion coefficient equal to that of said rear panel, said second electrode leads being inserted into said rear panel and connected to said first electrode leads.
Claim 15
Dependent Claim
30 words
A light emitting device according to claim 14, wherein said substrate is held at a predetermined distance from said rear panel by means of said first and second electrode leads.
References Cited (Backward Citations)
No citation records indexed.
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