Thick-film sheet member, devices to which the sheet member is applied, and methods of producing the sheet member and the devices

A thick-film sheet member, characterized by including:

• a dielectric core body provided by a thin-plate-like thick-film dielectric body having a predetermined thickness;
• a thick-film conductive body disposed on a surface of a part of said dielectric core body;
• and
• a boundary-portion-reinforcing dielectric body constituted by a thick-film dielectric material, and disposed on said surface of said dielectric core body, with such a configuration thereof that permits said boundary-portion-reinforcing dielectric body to continuously extend and straddle a boundary between said dielectric core body and said thick-film conductive body.

A cold-cathode display device including:

• a plurality of emitters disposed on a first substrate;
• a plurality of anodes disposed on a second substrate parallel with said first substrate, so as to be opposed to said plurality of emitters;
• and a plurality of gate electrodes disposed in a position between said emitters and anodes and having a plurality of through-holes, so that electrons flowing from said emitters toward said anodes pass through said through-holes, whereby fluorescent layers fixed to surfaces of respective anodes are activated by said electrons, to emit light, said display device being characterized by including:
• a thick-film sheet member having a thick-film dielectric layer having said through-holes, and a plurality of thick-film conductive layers disposed on said thick-film dielectric layer and electrically independent of each other, so as to constitute said gate electrodes.

A method of producing an inorganic EL device which has a luminous layer constituted by an inorganic material, a first dielectric layer provided by a translucent layer disposed on one of opposite surfaces of said luminous layer, a second dielectric layer disposed on the other of said opposite surfaces of said luminous layer, a first electrode layer disposed on a surface of said first dielectric layer, and a second electrode layer disposed on a surface of said second dielectric layer, so that light generated by said luminous layer with application of electric current between said first and second electrode layers, is seen through said first dielectric layer, said method being characterized by including:

• a thick-film-sheet-member preparing step of preparing, a thick-film sheet member provided by a thick-film dielectric body for constituting said second dielectric layer;
• an one-side-surface film forming step of disposing said second electrode layer on one of opposite surfaces of said thick-film sheet member;
• and
• an other-side-surface film forming step of sequentially disposing said luminous layer, said first dielectric layer and said first electrode layer on the other of said opposite surfaces of said thick-film sheet member.

A fluorescent display tube including:

• a plurality of fluorescent layers which are fixed to respective anodes disposed on a display surface of a substrate;
• a filament cathode which is disposed above said fluorescent layers;
• and a plurality of control electrodes which are disposed in a height position between said fluorescent layers and said cathode, so that electrons generated from said filament cathode are controlled by said control electrodes, to strike selected at least one of said fluorescent layers, whereby said selected at least one of said fluorescent layers is activated to emit light, said fluorescent display tube being characterized by including:
• a thick-film sheet member which is fixed to said display surface of said substrate, and which has a thin-plate-shaped thick-film dielectric body and a plurality of thick-film conductive electrodes,
• wherein said thick-film dielectric body has a predetermined thickness and a plurality of opening portions each of which is positioned in a position located above a corresponding one of said fluorescent layers and has such a size that permits an entirety of the corresponding fluorescent layer to be seen through each of said opening portions,
• and wherein each of said thick-film conductive electrodes is fixed to a surface of said thick-film dielectric body, and extends along a periphery of a corresponding one of said opening portions, so as to constitute a corresponding one of said control electrodes.

A method of producing a fluorescent display tube in which electrons generated from a filament cathode are controlled by a plurality of control electrodes, to strike selected at least one of a plurality of fluorescent layers, whereby said at least one of said fluorescent layers is activated to emit light, said method including a step of disposing a plurality of anodes on a display surface of a substrate, a step of fixing said plurality of fluorescent layers onto the respective anodes, a step of disposing said plurality of control electrodes above said plurality of fluorescent layers, and a step of disposing said filament cathode above said control electrodes, said method being characterized by including:

• a thick-film-sheet-member fixing step of fixing a thick-film sheet member which has a thin-plate-shaped thick-film dielectric body and a plurality of thick-film conductive electrodes, to said display surface of said substrate, wherein said thick-film dielectric body has a predetermined thickness and a plurality of opening portions each of which has such a size that permits an entirety of a corresponding one of said fluorescent layers to be seen through each of said opening portions, wherein each of said thick-film conductive electrodes is fixed to a surface of said thick-film dielectric body, and extends along a periphery of a corresponding one of said opening portions, so as to constitute a corresponding one of said control electrodes, and wherein said thick-film sheet member is fixed to said display surface of said substrate such that each of said plurality of opening portions is positioned in a, position located, above a corresponding one of said fluorescent layers.

A thin CRT including:

• an electron source;
• a plurality of first electrodes extending along a predetermined direction;
• a plurality of second electrodes extending along another direction crossing said predetermined direction;
• and a fluorescent surface on which a predetermined fluorescent layer is disposed, and defining a vacuum space in which electrons generated from said electron source are controlled by said first and second electrodes, so that said electrons passing through said second, electrodes are permitted to strike a desired portion of said fluorescent surface, whereby said fluorescent layer emits light which is seen through said fluorescent surface,
• said thin CRT being characterized by including a thick-film sheet member which has:
• a dielectric support layer provided by a thick-film dielectric body having a multiplicity of electron passing-through holes;
• and
• a thick-film conductive layer provided by a plurality of conductive films which are elongated along said another direction and are disposed on a surface of said dielectric support layer, for constituting said second electrodes,
• wherein said thick-film sheet member is disposed between said first electrodes and said fluorescent surface, such that said thick-film sheet member is parallel with said fluorescent surface.

A method of producing a thin CRT including an electron source;

• a plurality of first electrodes extending along a predetermined direction;
• a plurality of second electrodes extending along another direction crossing said predetermined direction;
• and a fluorescent surface on which a predetermined fluorescent layer is disposed, and defining a vacuum space, in which electrons generated from said electron source are controlled by said first and second electrodes, so that said electrons passing through said second electrodes are permitted to strike a desired portion of said fluorescent surface, whereby said fluorescent layer emits light which is seen through said fluorescent surface,
• said method being characterized by including a thick-film-sheet-member fixing step of fixing a thick-film sheet member between said first electrodes and said fluorescent surface, such that said thick-film sheet member is parallel with said fluorescent surface, said thick-film sheet member having:
• a dielectric support layer provided by a thick-film dielectric body having a multiplicity of electron passing-through holes;
• and
• a thick-film conductive layer provided by a plurality of conductive films which are elongated along said another direction and are disposed on a surface of said dielectric support layer, for constituting said second electrodes.