JPH03263049A - Transfer tyep electrostatic thermal recording medium - Google Patents

Abstract

PURPOSE:To obtain the recording medium used for a method of allowing recording of digital information on plain paper, etc., with a simple process by providing an electrostatic thermal recording layer and a conductive layer and imparting lubricity to the surface on the conductive layer side thereof. CONSTITUTION:The transfer type electrostatic thermal recording medium having the electrostatic thermal recording layer 1 and the conductive layer 2 is made into the transfer type electrostatic thermal recording medium having the lubricity on the conductive layer 2 side. The electrostatic thermal recording layer 1 is a material which has a charge holding function at ordinary temp. and becomes weakly chargeable or non-chargeable at about the time a heat signal is applied thereto by a thermal head; for example, commercially marketed polymer films are mostly usable. An electrostatic charge layer 2 is formed by vapor deposition of Al or applying of an electrostatic charge material on such polymer film and a lubricative layer 3 is provided thereon. The process is simplified in this way and this recording medium is usable for the method allowing the recording of the digital information on the plain paper, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a transfer type electrostatic recording medium, and particularly to a transfer type electrostatic thermal recording medium in which heat is input from the surface opposite to the charged surface.

[Prior Art] A resin layer that reduces electrical resistance by heating, such as a resin layer made of polyvinyl chloride, polyethylene, polyester, polystyrene, styrene-maleic acid copolymer, etc., is provided on an electrically conductive substrate, and this layer is A method of forming an electrostatic latent image by electrostatically charging and irradiating with heat rays according to the original image (Japanese Patent Publication No. 35-14722), or using polyester, chlorinated polyvinyl chloride, vinyl chloride, etc. A copying method in which an electrothermographic material that is sufficiently transparent to heat rays is placed on the original image to be copied, an electrostatic charge is applied, and then an electrostatic latent image is created by the action of heat rays, which is then reversely developed and fixed using dry toner. Kosho 38-14347) is known.

In these techniques, infrared rays are irradiated while the document is in close contact with the document, resulting in poor image resolution and the required recording energy. Furthermore, these methods also have the disadvantage of requiring a manuscript as recorded information, and in recent years, it has been difficult to print memory information from computers, communication information from faxes, and digital information from word processors and CAD-CAM. Another drawback is that it cannot be used as a record for a printer that prints out.

[Problems to be Solved by the Invention] The present invention aims to provide a recording medium that has a simpler process than the prior art and can be used in a method for recording digital information on plain paper, etc. .

[Means for Solving the Problems] The structure of the present invention for solving the above problems is such that, in a transfer-type electrostatic thermal recording medium having an electrostatic thermal recording layer and a conductive layer, the surface on the conductive layer side has a slippery surface. type electrostatic thermal recording medium.

To explain the above structure in detail with reference to FIG. It is a material that becomes

To be more specific, a polymer film with a volume resistivity of 1012Ω or more is suitable, and the temperature is 100 to 150°C.
It is preferable that the resistance is 1011Ω (up to) or less.

As examples of such materials, most commercially available polymer films can be used, but in view of cost, general-purpose films such as polyethylene, polypropylene, vinyl chloride, vinylidene chloride, and polyester are suitable.

A conductive layer 2 is formed on these polymer films by A1 vapor deposition or by coating a conductive material.

The slippery layer 3 is formed by forming a layer of stearic acid amide, behenic acid amide, polyethylene wax, etc. to a thickness of 0.1 to 5 μl11 (preferably 0.2 to 1 μm), or by coating a small amount of silicone oil. , or silicone fine particles, organic fine particles such as acrylic or styrene, or TiO2,5
Inorganic fine particles such as i02 and M0203 are used.

Figure 1 shows an example of using a lubricating material as the material of the conductive layer 2, such as a layer containing an organic conductive material made of an ionic surfactant, or an inorganic material such as graphite or conductive carbon black. A layer containing a conductive material.

2a to 2d explain the principle of copying using the recording medium of the present invention.

a. Charging step (FIG. 2a) The recording medium is charged with a negative corona charger 4, a roller charger, a brush charger, or the like.

b. Thermal writing process (FIG. 2b) The image signal is input from the thermal head 5 to the conductive layer 2 side as heat. At this time, a bias voltage having the same polarity as the charged charge (- in the figure) is applied to the platen roller 6 or the pressing member as the opposing member to prevent the S/N of the electrostatic latent image from decreasing.

C1 Development Step By performing reversal development using toner 7 having the same polarity (-) as the charge of the electrostatic latent image, the toner is attached to the thermal writing area and developed.

d. Transfer/Fixing Step The image is transferred to a transfer medium 8 such as paper using the auxiliary force of a positive corona charger 9 or a transfer roller, and then fixed using hot air, a hot plate, or a hot roller.

The recording medium is repeatedly used after cleaning residual toner and residual charges.

FIG. 3 shows an example of an apparatus for carrying out transfer type electrostatic thermal recording based on the above principle.

The recording medium 17 of the present invention, which is formed into a belt shape with the conductive layer 2 on the inside, is rotated in the direction of the arrow by pulleys at both ends.First, the entire surface is negatively charged by the negative charging roller 10, and then silicone oil is applied. A coating roller 17 applies silicone oil to the surface of the conductive layer.

While applying a bias voltage to this recording medium by a bias application roller 11, an image signal is inputted by a thermal head 5. After the recording medium on which the latent image has been formed is developed by the developing roller 12, the image is transferred onto the paper 13 by the transfer roller 14 to which a positive voltage is applied. The recording medium 17 is then cleaned by a cleaning roller 15 and then sent to the charging roller again.

The image transferred to the paper 13 is completed through a fixing process.

[Example] Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 As an electrostatic thermal recording layer, about 500 aluminum conductive layers were deposited on polyethylene with a thickness of 25 μW.

Using a recording medium coated with a small amount of silicone oil on the aluminum conductive layer, writing was performed using a thermal head from the back side (conductive layer side) using the apparatus shown in Figure 3, and the electrostatic thermal recording layer side (front side) was coated with a Ricoh recording medium. After developing with a liquid developer for PPC produced by Co., Ltd., the image was transferred to plain paper (Cuco Type 6000 Paper), and a clear image with an ID of 1.4 and no background smudge was obtained. Such images had substantially the same quality even when repeatedly recorded.

Example 2 As an electrostatic thermal recording layer, polypropylene with a thickness of 20 μm was used.
When recording was performed on a recording medium provided with a smooth conductive layer containing graphite in the same manner as in Example 1, a clear image with no background stain was obtained with an ID of 1.3. In this case as well, repeated recording was possible.

Comparative Example 1 When silicone oil was not used in Example 1, the ID was similarly high at 1.4 and the image was clear, but the lubricity between the thermal head and the aluminum vapor deposited layer was poor and scumming occurred.

[Effects of the Invention] As explained above, by using the transfer type electrostatic recording medium of the present invention, it is possible to form clear images without background stains.

[Brief explanation of drawings]

Figures 1a and 1 are schematic cross-sectional views showing the structure of the transfer electrothermal recording medium of the present invention, and Figures 2a to 2d are illustrative of the recording method using the recording medium of the present invention. An explanatory diagram showing the principle. FIG. 3 is an explanatory diagram of the apparatus used in Examples and Comparative Examples. DESCRIPTION OF SYMBOLS 1... Electrostatic recording layer, 2... Conductive layer, 3... Slippery layer, 4... Negative corona charger, 5... Thermal head,
6...Platen roller 7...Toner 8...
Transfer medium, 9... Positive corona charger, 10... Charging roller, 11... Bias application roller 12...
Developing roller 13...Paper, 14...Transfer roller 1
5... Cleaning roller, I6... Recording medium,
17...Silicone oil application roller Figure 3

Claims (1)

[Claims] 1. A transfer electrostatic thermal recording medium having an electrostatic thermal recording layer and a conductive layer, wherein the surface on the conductive layer side has lubricity.