JPS5979794A - Recording paper sensitive to electric discharge - Google Patents

Abstract

PURPOSE:To enable high-speed heat-sensitive recording with favorable thermal efficiency when using a recording paper in a scanning method of electrostatic recording, by using a recording paper wherein a dielectric layer is provided on a conductive base paper, and a heat-sensitive color forming layer is laminated thereon. CONSTITUTION:The dielectric layer 1b obtained by forming a dielectric material such as polyethylene or an alkyd resin into a sheet form layer and the heat- sensitive color forming layer 1c constituted of an electron-donative color forming material, an electron-acceptive color forming material, a binder or the like are laminated on the conductive base paper 1a such as a smooth base paper coated or impregnated with an inorganic salt or the like, to obtain the recording paper. When positive and negative pulses +E1 and -E2 are repeatedly impressed on the recording paper 1 by a recording electrode 2, the first discharge current i(+) and the second discharge current i(-) are passed alternately, whereby Joule heat is generated, and heat owing to collision of ions at the time of electric discharge is generated, resulting in that a color is formed in the heat-sensitive color forming layer 1c.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a recording paper for use in facsimile machines, printers, etc., and provides a recording method that is capable of direct f, 8 recording without the need for development and fixing, and capable of high-speed recording. This invention relates to recording paper that is sensitive to the electric discharge that occurs.

[Technical background of the invention and its problems]

Recording methods conventionally applied to facsimiles, printers, etc. include electrostatic recording, thermal recording, inkjet recording, and discharge recording, each of which has advantages and disadvantages. Especially in recent recording devices, there is a strong demand for smaller devices and faster recording speeds, and there is a strong demand for the practical use of direct recording methods that do not require development or fixing and are capable of high-speed recording. It is rare.

Among conventional recording methods, electrostatic recording has a very high recording speed and is often applied to high-speed recording devices, but it requires development and fixing processes, making the devices large. In addition, thermal recording is direct recording and is suitable for downsizing the device, but the recording speed is slow, and if it is applied to an unreasonably high-speed recording device, it will cause image quality deterioration due to temperature rise in the thermal head body, increase in recording power, etc. Now. Furthermore, it is difficult to apply multi-heads to inkjet recording and discharge recording, and cylindrical scanning is required, resulting in poor high speed and operability.

[Object 1 of the Invention] In order to eliminate these drawbacks, the present invention provides a recording paper that can realize a recording method that utilizes the energy generated by electric discharge, and includes a dielectric layer, a color forming layer, and a dielectric layer on a conductive base paper. This is a recording paper that is sensitive to electrical discharge and is made up of stacked layers. The drawings will be explained in detail below.

[Embodiments of the invention]

FIG. 1 <a> shows an embodiment of the present invention, in which 1 is a recording paper sensitive to discharge, 2 is a recording electrode, and 3 is a counter electrode. The recording paper 1 that is sensitive to electrical discharge has a dielectric layer 1b and a coloring layer 1c that is sensitive to electrical discharge laminated on a conductive base paper 1a. Although there are various possible configurations for the color forming layer 1c that is sensitive to discharge, the following description will be made by taking as an example a heat-sensitive color forming layer that is sensitive to the heat generated due to discharge and has been provided with conductivity. FIG. 1(b) shows an equivalent circuit. Figure 1 (b
), Rg is the resistance of the gap d during discharge between the recording electrode 2 and the thermosensitive coloring layer IC, R is the resistance of the thermosensitive coloring layer IC, and C1 is the capacitor of the dielectric layer 1b corresponding to the recording electrode 2. The capacitance, R, is the resistance of the conductive base paper 1a, and SW is the discharge starting voltage (40
Turns on when a voltage of 0 to 600 V) or higher is applied. Next, the recording principle will be explained using FIG.

For example, as shown in FIG.
flows and forms a positive charge noturn on the dielectric layer 1b, and then the discharge stops naturally (switch SW in FIG. 1(b) is opened). ■Next, as shown in Fig. 2(b), when negative polarity Gursu E2 higher than the discharge starting voltage is applied, the second discharge current i
After 0 flows and erases the previous positive charge pattern with negative charges,
A new negative charge pattern is formed and the second discharge is stopped. When the positive polarity pulse 1El is applied again next time, the first discharge current i■ flows again, and, contrary to ■, after erasing the negative charge nosoturn with positive charge, a new positive charge pattern is formed and the discharge continues. Stop. By repeating this, discharge can be generated as many times as possible. As a result, Joule heat due to i and io is generated by the resistance Rc of the thermosensitive coloring layer 1c, the resistance Ra of the conductive base paper 1a, the resistance R of the air gap d, etc., and the heat generated by the collision of the lion with the discharge. occurs. Thermosensitive coloring B41 c develops in response to the heat accompanying the continuous discharge.

In this manner, the heat-sensitive coloring layer IC generates heat due to the discharge phenomenon, so it is much more energy efficient than conventional thermal recording, which records by transferring heat from a thermal head to thermal paper.

Note that this recording paper can be constructed entirely using conventional technology. That is, conventional manufacturing techniques for electrostatic recording paper and thermal recording paper can be applied.For example, the conductive base paper 1a is a 3V smooth base paper coated and impregnated with an inorganic salt, and the thermosensitive coloring layer IC is a triphenylmethane-based paper. From electron-donating coloring materials such as leuco dyes and fluoro/leuco dyes, electron-accepting coloring materials such as bisphenol A1 and maleic anhydride, binders such as methylcellulose and hydroxymethylcellulose, and other additives, auxiliary agents, and conductive agents. The layer composed of dielectric layer Jb is polyethylene,
A thin film layer of several micrometers to several tens of tons of dielectric material such as alkyd resin, ethyl cellulose, or polyvinyl acetate may be used. Further, the air gap d does not need to be formed intentionally, and even if the recording electrode 2 is pressed onto the recording paper 1 due to the unevenness of the recording paper, a gap of several ftm will naturally occur. For this reason, imperfect contact is allowed to some extent,
It becomes easy to increase the number of recording electrodes 2.

〔Effect of the invention〕

As explained above, the present invention is a recording paper that is a combination of an electrostatic recording paper and a thermosensitive recording paper, and its characteristics are shown below.

(1) Since the color development mechanism is similar to that of thermal recording, development and fixing are not necessary.

(2) Since the recording paper itself converts electrical to thermal energy, there is no energy loss associated with heat transfer between the thermal head and the thermal paper, as in conventional thermal recording, making it a highly efficient and high-speed recording device. Application to 1sf, 1. It is.

It is possible to apply a single pole, and the solid-state scanning method used in conventional static 'r++, ttt2 records can be applied.

7., C In the examples, for convenience of explanation, the coloring layer IC is a heat-sensitive coloring layer, or a layer 1.C that develops color in response to a discharge phenomenon. For example, it may be an electrolytic recording layer that is directly sensitive to discharge current.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention, and FIG. 2 is an explanatory diagram of the recording principle of the present invention.

Claims (3)

[Claims] (1) A recording paper sensitive to electrical discharge, characterized in that a dielectric layer is formed on a conductive base paper, and a coloring layer that develops color in response to electrical discharge is further laminated on the dielectric layer. (2) The recording paper sensitive to discharge according to claim 1, wherein the coloring layer is a thermosensitive coloring layer sensitive to heat. (3) A recording paper sensitive to discharge according to item 1 or 2 of the scope of patent nXJ, characterized in that the coloring layer is imparted with conductivity.