JPS5865675A - Multistylus electrode for current conducting transfer recording - Google Patents

Abstract

PURPOSE:To obtain the mullistylus electrodes for current conducting transfer recording having excellent heat resistance, by insulating a plurality of the needle shaped electrodes, and forming an insulated supporting body by a resin such as polyimide series resin having a thermal deformation temperature of 200 deg.C or higher. CONSTITUTION:A hardener is added to a mixed solution such as polyimide series polymers, e.g. polyamideimide polymer and the like before hardening, and the constituent solution of the insulated supporting body 6 is prepared. Meahwhile heating rollers 10 and 11 are arranged at the top and bottom of a supporting plate 9. Wire 3a is wound in the spiral groove formed in the outer surface of the upper heating roller 10. Said resin solution is arranged on the supporting plate 9, and semihardened state is obtained by the heating rollers 10 and 11. Then the wire 3a is cut. End parts on the one side of a plurality of the out wire 3a are held by a polymide plate 6a. Another semihardened state polyimide plate 6b is arranged on said end parts. Both polymide plates 6a and 6b are heated and hardened, and the insulated supporting body 6 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-needle electrode for current transfer recording, which is used in a current transfer recording method.

Conventionally, an ink sheet is brought into contact with a recording medium, a plurality of needle-shaped recording electrodes and a return electrode are brought into contact with the ink sheet, and an image signal voltage is selectively applied to these connections to produce ink that faces the recording electrodes. A recording method is known in which a portion of a sheet is melted and transferred to a recording medium.

Conventionally, multi-needle electrodes for electrostatic recording have been used as the plural needle-shaped recording electrodes used in this recording method, but when electricity is repeatedly applied for recording, the needle heat generated in the ink sheet is transferred to the recording electrodes. The heat is transmitted to the insulating holder that insulates and holds these, and the insulating holder is heated and deformed, or melts, causing the disposed electrodes to come into contact with each other. .

An object of the present invention is to provide a multi-needle electrode for electrical transfer recording that has excellent heat resistance.

The present invention comprises a plurality of needle-shaped recording electrodes to which an image signal voltage is applied, and an insulating holder that insulates and holds these recording electrodes, and the insulating holder has a heat distortion temperature of 200C or more. It is characterized by being made of resin.

The present invention will be described in detail below with reference to the Kla plane.

In FIG. 1, reference numeral 1 indicates a recording medium such as paper. On this recording medium 1, a base layer 2a and an ink layer 2 are formed.
The ink sheet 2 consisting of the ink layer 2b is placed in contact with the ink layer 2b.

The base layer 2m is formed by uniformly dispersing conductive powder in a binder resin. The ink layer 2b is made by uniformly dispersing a coloring material in a thermoplastic resin, and melts when the temperature reaches a predetermined temperature or higher.

A plurality of needle-shaped recording electrodes 3 and a return electrode 4 arranged at a predetermined interval from these are brought into contact with the base layer 2a of the ink sheet 2, and an image signal voltage applying circuit 5 is applied between them to form an image. When a signal voltage is applied, the ink layer 2b of the ink sheet 2 facing the recording electrode 3 is melted and transferred to the recording medium IK. The recording electrode 3 has an insulating holder 6
is insulated and held by The contact area of the recording electrode 3 with the ink sheet 2 is much smaller than the contact area of the return electrode 4 with the ink sheet 2.

When a voltage is applied, a current flows through the ink sheet 2, and although the contact area of the return electrode 4 with the ink sheet 2 is much larger than the contact area of the recording electrode 3 with the ink sheet 2, a current flows through the ink sheet 2. Opposing ink sheet 20
The current density in the part of the ink sheet 20 facing the recording electrode 3 is always higher than that in the other part, and the total current flowing in the recording electrode 3 and the return electrode 4 is the same. Since the Joule heat of the part of the ink sheet 20 facing the return electrode 4 is much larger than the Joule heat of the part of the ink sheet 2 facing the recording electrode 3, the part of the ink layer 2b of the ink sheet 2 facing the recording electrode 3 is exposed to the Zeel heat. is melted and transferred to the recording medium IK.

FIG. 2 shows one embodiment of the above-described current transfer recording method, and this will be explained below. Ajru.

The recording medium 1 is placed on transport rollers 7.8 arranged at predetermined intervals, and the ink sheet 2 is placed on top of the recording medium 1 so as to contact the ink layer 2b. Above this ink sheet 2 is located above the conveyance roller 7. A plurality of recording electrodes 3 are arranged in a row on the edge holder 6, and the lower surfaces of these recording electrodes 3 are in contact with the base layer 2aK of the ink sheet 2. Furthermore, a roller-shaped return electrode 4 is disposed on the ink sheet 2 so as to be located above the conveyance roller 8 and in contact with the base layer 2a of the ink sheet 2. An image signal voltage applying circuit 5 is connected to the recording electrode 3 and the return electrode 4.

The conveying roller 7.8 is rotated continuously or intermittently in the direction of the arrow by a drive means (not shown) to move the recording medium 1 and the ink sheet 2 continuously or intermittently in the direction of the arrow a, while maintaining image quality. An image signal voltage is selectively applied between the recording electrode 3 and the return electrode 4 by the signal voltage application circuit 5 to melt the portion of the ink layer 2b of the ink sheet 2 facing the recording electrode 3, thereby forming a recording medium. Transfer to 1. The ink sheet 2 and the recording medium 1 may be in contact with each other as long as at least the portion facing the recording electrode 3 is in contact with each other.

The ink sheet 2 may be formed by laminating an ink layer on a base layer having anisotropic conductivity, or may be formed by only an ink layer.

In addition, the recording electrodes 3 are arranged in two rows as shown in FIG.
may be located in the middle of the recording electrodes 3 in other examples, and furthermore, the recording electrodes 3 in each row may be located in the middle of the recording electrodes 3 in other examples. You can. Further, the return electrode 4 may be fixed to the end surface of the S* holder 6 of the recording electrode 3 as shown in Figure 1IIIJ.

The insulating holder 6 is made of resin having a heat deformation temperature of 200c or more. This is because when the number of recordings increases, the Geel heat generated in the ink sheet 2 is transmitted to the recording electrode 3 and the insulating holder 6, and the insulating holder 6 is heated, causing it to be thermally deformed or melted. This is to prevent the recording electrodes 3 from coming into contact with each other.

Suitable materials for the insulating holder 6 include polyimide polymers such as polyamide-imide polymers and polyester-imide polymers, vara xylylene, polybenzindazole, silicone polymers, and fluorine polymers.

Among these, polyimide-based polymers have good moldability and heat resistance, and are therefore most suitable as the constituent material of the insulating holder 6.

Next, a specific example of creating a multi-needle electrode for electrical transfer of the present invention will be explained based on FIGS. 5 to 8.

A curing agent is added to a mixed solution of a solution of polyimide dissolved in a solvent and a solution of boria-containing toimide dissolved in a solvent to create a constituent solution of the insulating holder 6.

Then, as shown in FIG. 5, heating rollers 10 and 11 are arranged on the upper and lower sides of the support plate 9, and the wire 3a is wound in a spiral groove formed on the outer peripheral surface of the upper heating roller 10, and the The constituent solution of the insulating holder 6 is placed on the support plate 9 so as to be in contact with the wire 3aK wound around the heating roller 10, and then the solution is applied to the heating rollers 1G and II.
When the wires 3a are no longer than K, the wires 3a are cut to leave one end of the plurality of wires 3m held by a semi-hardened polyind board 6a as shown in FIG.

Next, as shown in FIG.
'lI! Spread it out without touching it, as shown in Figure 8.
Semi-cured polyimide board 6! ! Wire 3a held by
The ends of the semi-cured polyimide plates 6a and 6b are sandwiched between other semi-cured polyimide plates 6b, and these semi-cured polyimide plates 6a and 6b are
The insulating holder 6 was formed by heating for 15 hours to completely cure the insulating material, thereby producing a multi-needle electrode for electrical transfer.

Since the multi-needle electrode for current transfer recording of the present invention has excellent heat resistance, even if recording is repeated, the insulating holding part side will not be thermally deformed or melted.

[Brief explanation of the drawing]

@Figure 1 is a diagram for explaining the energization Matsumoto recording method using the multi-needle electrode for energization transfer recording of the present invention, and FIG. 3- and 4 are bottom views showing other embodiments of the multi-needle electrode for current transfer recording of the present invention, and FIG. 5 is a partial view showing a device used to create the same multi-needle electrode for current transfer recording The notch slope view and FIGS. 6 to 8 are diagrams for explaining the process of creating the multi-needle electrode for electrical transfer recording. 3... Recording electrode, 4... Return electrode, 5... Image signal voltage application circuit, 6... Insulating holder Fig. 8

Claims (3)

[Claims] (1) Consisting of needle-shaped recording electrodes that apply a 1m signal voltage and an insulating holder that insulates and holds these recording electrodes, the insulating holder is made of resin having a heat distortion temperature of 200C or higher. A multi-needle electrode for electrical transfer recording, characterized in that it is formed of: (2) The multi-needle electrode for electrical transfer recording according to claim 1, wherein the insulating holder is mainly made of polyimide resin. (3) A multi-needle for electrical transfer recording according to claim #I1, wherein the insulating holder is formed using a solution prepared by dissolving a polyimide resin in a solvent and adding a curing agent. electrode.