Electrorecording paper
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorYoichi Sekine
Life of this patent
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Abstract
A recording paper having a color-developing layer containing a component capable of being colored or discolored by application of heat which has been made electroconductive by incorporation of an electro-conductive substance. When an electric current is applied to the color-developing layer, the recording paper selectively gives a visible record at a portion of the color-developing layer to which the electric current has been applied.
Claims9
An electrorecording paper having a color-developing layer containing a component capable of changing color in response to applied heat, said color-developing layer comprising a heat coloring component and an electroconductive substance, both of which are dispersed in the form of fine particles in a binder;
- said electroconductive substance being substantially light reflective, electron conductive and having a specific resistance not greater than 10.sup.4 .OMEGA. cm and selected from the group consisting of cuprous iodide, tin dioxide[,] and silver-iodide[, and antimony];
- and said color-developing layer having a [surfacee] surface resistivity of not greater than 10.sup.7 .OMEGA. [cm.] at a temperature of 20.degree. C. and at a relative humidity of 65%;
- said layer being capable of recording by changing color in response to heat applied by means of an applied electric current.
[7. A recording paper according to claim 1, wherein the electroconductive substance is antimony-containing tin dioxide.]
[8. A recording paper according to claim 1, wherein the electroconductive substance is silica gel coated with antimony-containing tin dioxide.]
[9. A recording paper according to claim 1, wherein the electroconductive substance is
- coated with a metal film.] 10. A recording paper according to claim 3, wherein an electroconductive layer is disposed between the supporting
- member and the color-developing layer. 11. A recording paper according to claim 10, wherein the electroconductive layer is a layer composed of a [support and a] metal, which has been deposited on the support by
- vacuum evaporation. 12. A recording paper according to claim 10, wherein
- the electroconductive layer is composed of cuprous iodide. 13. A recording paper according to claim 12, wherein the electroconductive layer composed of cuprous iodide [ is a layer comprising a support and cuprous iodide,
- which] has been deposited on the support by vacuum evaporation. 14. A recording paper according to claim 12, wherein the electroconductive layer composed of cuprous iodide is a layer comprising particles of cuprous
- iodide which have been bonded by use of a binder. 15. A recording paper according to claim 10, wherein the electroconductive layer is a layer comprising carbon particles which have been bonded by use of a binder.
- A recording paper according to claim 3, wherein the support is an
- electroconductive material. 17. A recording paper according to claim 3, wherein a second color-developing layer formed by dispersing in a binder fine particles of a component capable of being colored by application of
- heat is disposed between the color-developing layer and the support. 18. A recording paper according to claim 17, wherein an electroconductive layer is disposed between the second color-developing layer and the support.
Dependencies are inferred from the claim text.