JPH03187765A - Recorder using porous film - Google Patents

Abstract

PURPOSE:To improve recording quality by making bleeding of ink adequate by a method wherein a porous film consisting of water expellent fluororesin is used. CONSTITUTION:An ink feed component, i.e. a roll 3 will suffice for the purpose when it can be impregnated by conductive ink, and sponge is used therefor herein. An insulating porous film of, for example, 30-100 mum thickness consisting of fluororesin is used as a film for screen (mesh) 1. A porous sheet or film a surface of which is made insulating by covering it with fluororesin may be used. A metallic electrode 4 is buried in a platen 5. A plurality of electrodes 4 are arranged in a line direction. By impressing voltage selectively to this electrode, ink sticks by being attracted onto recording paper 2 corresponding to a position of the electrode 4 to which voltage is impressed and recording by a dot is performed. Water-color conductive ink is used as ink. Since such a porous film consisting of water expellent fluororesin is used, when voltage is impressed between the ink feed component and the electrode, ink bleeds adequately through a hole of the porous film, and printing of mold resolution is obtained.

Description

[Detailed Description of the Invention] [Summary] A mesh recording paper having many fine holes is connected to an ink supply member that holds conductive ink and a platen provided with an electrode, and the ink supply member contacts the mesh side. In a steady state, the ink cannot enter the holes in the mesh due to the low wettability of the ink to the mesh, but by applying a voltage between the ink supply member and the electrode to generate an electric field, the ink in the ink supply member Regarding a recording device that applies electrostatic force to cause ink to pass through holes in a mesh and adhere to a recording medium, by specifying the material that makes up the mesh, the ink oozes out appropriately and the recording quality is improved. For this purpose, we constructed a recording device using a porous film made of fluororesin as a mesh.

[Industrial application field]

The present invention relates to a recording device applied to printers, facsimile machines, etc., and in particular has a simple structure, a compact device, and
The present invention relates to a new recording method using porous film, which has the advantages of high reliability and low running costs.

In recent years, a method that uses a mesh or porous film to record messages on recording paper using ink that passes through these holes under an electric field has been attracting attention as a compact printer, but recording devices using this method There is a demand for higher speed and higher resolution.

[Conventional technology]

Conventionally, several types of desktop non-impact printers have been put into practical use, such as inkjet, thermal transfer, and electrophotography. Although these methods have many advantages, they have advantages and disadvantages in terms of recording speed, reliability, running costs, colorization, etc.

In order to improve the recording speed, it is essential to form the print head section into lines, but in principle, in the inkjet method, it is difficult to form the nozzles into lines. For this reason, several improved inkjet systems have been proposed, but they have not yet been put into practical use.

On the other hand, the thermal transfer recording method is suitable for line production, but
Since the ink sheet is a consumable item, running costs are high.

Therefore, as a new method to improve these problems,
The mesh and the recording paper are pressed into contact with an ink supply member such as an ink roller that holds conductive ink and a platen provided with an electrode, and a voltage is applied between the ink supply member and the electrode to generate an electric field. In a steady state, the wettability of the ink to the mesh is low, so the ink cannot enter the holes in the mesh, but an electrostatic force is applied to the ink due to the generation of an electric field.
We proposed a recording device that allows ink to pass through mesh holes and adhere to recording paper. In this case, the mesh used is a thin plate with many fine holes closely spaced therein.

[Problem to be solved by the invention]

However, in the method of making a mesh by making a large number of holes in a plate by etching or the like, the limit of the hole density is about 250 points/inch, and this value is also the limit of the dot density of the recorded image. Furthermore, when using metal plates etc.
Since the wettability with the ink is too good, there is a problem in that the ink oozes to the recording paper side even during normal operation.

Therefore, an object of the present invention is to provide a recording apparatus that can improve recording quality by appropriately controlling ink seepage by specifying the material that constitutes the mesh.

[Means to solve the problem]

The inventors conducted experimental research to develop a method with even higher resolution and stability, and discovered that such printing was possible by using a porous film made of water-repellent fluororesin. .

With porous films made of fluororesin, it is possible to produce films of 500 mesh/inch or more, and higher resolution printing is possible. In addition, porous films made of fluororesin have the property that even if they are thin and have large holes, ink does not pass through them easily compared to metals, making it the most suitable material for the mesh used in such recording methods. It turned out to be.

[For production]

In the present invention, since a porous film made of a water-repellent fluororesin as described above is used, when a voltage is applied between the ink supply member and the electrode, the ink oozes out through the holes in the porous film. , printing with mold resolution can be obtained.

〔Example〕

Embodiment 1 FIG. 1 is a sectional view of a main part showing a first embodiment of the present invention.

The ink supply member, i.e., the roll 3, may be any material as long as it can be impregnated with conductive ink, and a sponge "r" was used here.The screen film (mesh) 1 is made of, for example, a fluororesin with a thickness of 30 to 100 μm. An insulating porous film (trade name: Fluoropore, manufactured by Sumitomo Electric Industries, Ltd.) was used. A porous plate or film may be coated with fluororesin to make the surface insulating.Platen 5 A metal electrode 4 is embedded in the electrode 4.A plurality of electrodes 4 are arranged in the line direction.By selectively applying a voltage to these electrodes, a record corresponding to the position of the electrode 4 to which the voltage is applied can be obtained. The ink is suctioned onto the paper 2 and a dot is recorded.A water-based conductive ink was used.As for the physical properties of the ink, optimizing the surface tension is particularly important, but the material of the mesh 1 It depends largely on the thickness and hole diameter, and needs to be adjusted within the range of 10 to 73 dyne/am.Here, ink of 61.7 dyne/cm was used. Although not specified, it is necessary to increase the applied voltage as the thickness of the recording paper 2 increases.Here, the recording paper 2 with a thickness of 65 J1 m was used.

As a result of recording with an energy of a voltage of 600 V and a pulse width of 1 ms, a dot with a diameter of 70 mm was obtained on the recording paper.

In the first embodiment, la represents a hole in the mesh (porous film), 6 represents a power source, and 7 represents a switch.

Second Embodiment In the first embodiment (FIG. 1), instead of the recording paper 2, it is also possible to form an image once on a film such as polyester and then transfer this image to the recording paper. Such an embodiment is shown in FIG. That is, FIG. 2 is a sectional view of essential parts showing a second embodiment of the recording apparatus according to the present invention. In FIG. 2, reference numeral 8 denotes an insulating transfer film made of polyester or the like that is impermeable to ink, and a fixed film can be used regardless of the type or properties of the recording paper 2.

Therefore, in this case, there is a feature that the range of selection of types of recording paper 2 that can be used can be widened. Furthermore, with this method, the applied voltage can be kept low and constant. Further, the recording paper 2 is located downstream of the transfer film 8 and is driven by a roller 9 or the like in synchronization with the film 8. Other structures and functions are the same as those in the first embodiment.

〔Effect of the invention〕

As described above, according to the present invention, since a porous film made of a water-repellent fluororesin is used, images with high resolution and stable recording quality can be recorded at high speed.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a first embodiment of the recording device of the present invention, and FIG.
The figure shows a second embodiment of the recording apparatus of the present invention. In these figures, 1 is a porous screen film made of fluororesin, 2 is recording paper, and 3 is an ink supply member (
4 is an electrode, 5 is a platen, 6 is a power source, 7 is a switch, 8 is a transfer film, and 9 is a roller. Recording device (first embodiment) 1 Figure 5...Platen 6...Power supply 7...Switch

Claims (1)

[Claims] 1. Mesh with many minute holes (1) and recording paper (2)
A mesh (1
) side so that the ink supply member (3) comes into contact with the ink supply member (3),
In a steady state, the ink cannot enter the holes in the mesh due to the low wettability of the ink to the mesh, but by applying a voltage between the ink supply member (3) and the electrode (4) to generate an electric field, the ink supply member (3) ) on the recording medium (2) by applying an electrostatic force to the ink and letting it pass through the holes in the mesh (1).
) In a recording device that attaches ink to a mesh (1
) A recording device characterized in that a porous film made of fluororesin is used as the material.