Electric lamp and discharge devices – With luminescent solid or liquid material – Vacuum-type tube
Patent
1979-12-13
1983-01-11
Demeo, Palmer C.
Electric lamp and discharge devices
With luminescent solid or liquid material
Vacuum-type tube
H01J 6302
Patent
active
043684041
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a matrix-type fluorescent indicator lamp which is composed of a matrix with a number of anode thin wires stretched in latitudinal arrangement between wire supporting bodies and a number of grid thin wires stretched in longitudinal arrangement across supporting members spaced mutually, and which receives thermoelectrons emitted from cathode filaments at the anode thin wires to which fluorescent material is applied where the anode thin wires intersect the grid thin wires in the matrix to make luminous so as to display characters, signs and figures selectively as a dotted pattern.
2. Background Art
Fluorescent indicator lamps which indicate characters, signs, figures employing fluorescent material which illuminates when impinged by electrons are in prior art. Also it is known that these lamps are used to show data with characters or signs in various control devices or information processors.
For example, Japanese Patent publication No. 45-20223 shows one type of conventional fluorescent indicator tube. Here a plurality of picture elements required to show characters (0) to (9) with a line-pattern are previously so drawn on an insulated base using fluorescent material that desired characters can be displayed by supplying a positive voltage to select one or more picture element on the base. This type of the lamp has disadvantage that the number of characters which can be selectively displayed is limited.
Another type of conventional fluorescent indicator lamp is a matrix type in which fluorescent material is discretely distributed in longitudinal and latitudinal directions to display desired characters or signs as luminous spots.
Such lamps as mentioned above have the advantage that many sorts of characters or signs can be selectively displayed. In this type of lamp, however, because of low distribution density of luminous spots, a dotted pattern that is a set of luminous spots becomes unclear, particularly for smaller size of characters or signs or complicated figures. This means that the resolving power is low, therefore such lamps is not suitable to display figures such as graphs, without an expensive CRT.
Constitution of the above-mentioned conventional matrix-type fluorescent indicator lamps which display characters or signs with a dotted pattern is as follows:
A number of grid thin wires are arranged in parallel within a discharge space of the indicator lamp. A number of anode thin wires which are perpendicular to the grid thin wires so as to substantially constitute a matrix are arranged in parallel on upper surface of a board by printed circuit means. Then the upper surface of the printed circuit is covered by an insulated layer so that the anode thin wires are enveloped. Small holes are so formed in the insulated layer at the intersections in the matrix and fluorescent material is applied to the holes to be luminous spots with the anode thin wires being conductive to the fluorescent material. If the distance between the anode thin wires is diminished to densify the luminous spot, distance required to secure insulation between the wires is shortened enough to cause an electric leakage.
Accordingly, it is a general object of this invention to provide a matrix-type fluorescent indicator lamp which can display smaller characters, signs including bigger ones clear-cut and which moreover is suitable to display graphs or complicated figures and which permits color displays with two or more than two colors combined or with one of the colors selected as a result of densifying the luminous spot.
DISCLOSURE OF INVENTION
The present invention is characterized in that a number of anode thin wires, which are arranged in parallel to form a matrix with a number of grid thin wires arranged in parallel within a vacuum space being composed of a wall and an insulated substrate opposing to the wall, at least either of which is light-passable, are located with a certain distance spaced from the surface of the substrate.
This results in each of the anode thin wires
REFERENCES:
patent: 2500929 (1950-03-01), Chilowsky
patent: 2926286 (1960-02-01), Skellett
patent: 2965801 (1960-12-01), Archer et al.
patent: 3136911 (1964-06-01), Crawford et al.
patent: 3509402 (1970-04-01), DuBois, Jr. et al.
patent: 3566187 (1971-02-01), DuBois, Jr.
patent: 3800178 (1974-03-01), Farina
patent: 3806760 (1974-04-01), Shimada
patent: 4075535 (1978-02-01), Genequand et al.
Chowa Giken Kabushiki-Kaisha
DeMeo Palmer C.
Palmer Carroll F.
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