JPH02214662A - Recorder - Google Patents

Abstract

PURPOSE:To obviate a special ink and contrive a higher speed and a smaller size by irradiating a photosensitive body with light according to an image signal, and biasing an ink head and a transparent conductor layer by a bias power supply. CONSTITUTION:A photosensitive drum 11 is rotated in the direction of an arrow, and is irradiated with light according to an image signal by an image exposure means 1, an ink head 4 and a transparent conductor layer 15 are biased by a bias power supply 3. By this, a latent image charge corresponding to the polarity of the bias is formed on a photosensitive layer 16, and simultaneously, an electric charge opposite in polarity to the latent image charge is injected into an ink surface on the ink head 4. An electrostatic force generated between the electric charges 8 and 9 causes an ink droplet to fly and to adhere to a recording paper, thereby recording a visible image. The recording can be realized at high speed, and the drum serves also as a platen for feeding the paper. Thereafter, the drum 11 is further rotated, and the latent image charge is removed by irradiation with light from a lamp for static elimination.

Description

[Detailed Description of the Invention] [Summary] Regarding a recording device that applies electrophotographic technology, inkjet technology, etc., the purpose of the present invention is to realize a high-speed and compact inkjet recording device without requiring special ink. An image exposure means is provided on the transparent electrode side of a photoreceptor having a three-layer structure consisting of a transparent conductive layer, a photosensitive layer, and an insulating layer, and an ink head is provided on the insulating layer side of the photoreceptor facing the image exposure means. In addition, a bias power source for applying a bias to the ink head and the transparent electrode is provided.

[Industrial application field]

The present invention relates to a recording device applying electrophotographic technology 1, inkjet technology, etc.

In recent years, with the rapid development of the information industry, various information systems have been developed, and output devices (printers) suitable for these systems have been developed.
There is a growing demand for For example, for output devices such as personal computers and word processors, there is a demand for small, low-cost printers that can be used on desktops.

[Conventional technology]

Conventionally, as this type of output device, there are various types of printers depending on the purpose, but the reality is that there is no definitive printer as there are advantages and disadvantages. By the way, recording methods for boat fishing can be divided into impact methods and non-impact methods. Although the impact method has advantages such as small size, low cost, and maintenance-free performance, it has a problem in terms of noise. On the other hand, non-impact methods include serial methods and page methods. The serial method has the advantage of being small and low cost, but the thermal transfer method has slow recording speed (and the inkjet method has problems such as clogging).The representative page method is the electrophotographic method. Although it has advantages such as high-speed printing and high print quality, the process is complicated, so it has currently reached its limit in terms of lowering the price and miniaturizing the device.

[Problem to be solved by the invention]

Among the above recording methods, the thermal transfer method and the inkjet method are suitable for desktop printers. However, as mentioned above, the thermal transfer method has problems such as slow recording speed and high running cost, and there is a feeling that there is a lack of progress. On the other hand, the inkjet method has many advantages such as low power consumption, low running cost, and easy colorization, apart from the problems of clogging and production lines, and various methods are being considered. These include, for example, a piezo drop-on-demand method and an electrostatic drop-on-demand method. The piezo drop-on-demand method is a method in which the vibration force of a piezo element is used to generate pressure waves in an ink chamber filled with ink to cause ink to be ejected from a nozzle. Although this method has a simple and compact structure and is expected to be inexpensive, it has not yet reached a satisfactory level in terms of ink droplet formation speed, multi-nozzle formation, microdroplet formation, etc. In addition, the electrostatic type has the advantage of being able to form very small ink droplets, but since a high voltage is applied to the recording electrode at the ink ejection port, it is necessary to use ink with a high specific resistance. In addition, multi-nozzle configuration requires a complicated configuration such as providing a recording electrode and a counter electrode, and the driving method also becomes complicated accordingly.

An object of the present invention is to realize a high-speed, compact inkjet recording device without requiring special ink.

[Means to solve the problem]

FIG. 1 is a diagram illustrating the principle of the present invention. In the figure, 1 is an image exposure means (light source), 2 is a photoreceptor, 3 is a bias power source, and 4 is an ink head. The photoreceptor 2 includes a transparent conductive layer 5 and a photosensitive layer 6.
The image exposing means 1 is arranged on the transparent conductive layer 5 side of the photoreceptor 2, and the ink head 4 is arranged on the insulating layer 7 side of the photoreceptor 2. are placed facing each other. The bias power supply 3 is connected to the ink head 4 and the transparent conductive layer 5 to apply a bias thereto.

[For production]

During recording, the image exposure means 1 irradiates the photoreceptor 2 with light corresponding to the image signal, and the bias power supply 3
From ink head 4. A bias is applied to the transparent conductive layer 5. As a result, a latent image charge 8 corresponding to the polarity of the bias is formed on the photosensitive layer 6, and at the same time, a charge 9 having the opposite polarity to the latent image charge 8 is injected into the ink surface of the ink head 4. The ink droplets fly due to the electrostatic force of these charges of 8°9, and high-speed recording is performed. FIG. 1 shows an example in which a recording paper 100 is supplied between the photoreceptor 2 and the ink head 4, and an ink image 101 is formed on the recording paper 100.

As described above, in the present invention, there is no need to provide a recording electrode on the ink head side as in the conventional case, so the structure of the ink head is simplified and there is no need to limit the specific resistance of the ink. Furthermore, line recording is also possible with a simple configuration consisting of only the photoreceptor 2 and the image exposure means l.

〔Example〕

The present invention will now be described in detail with reference to FIGS. 2 to 4.

A first embodiment is shown in FIGS. 2 and 3.

FIG. 2 is a perspective view showing the general structure of the recording apparatus of this example. In the figure, 11 is a photosensitive drum (photosensitive member), 12 is a lamp for static elimination, and 13 is an ink for supplying ink to the ink rad 4. The storage section 14 is a recording paper conveyance row. Note that the same reference numerals are used for the same members as in FIG. 1.

As shown in detail in FIG. 3, the photosensitive drum 11 has a three-layer structure consisting of a transparent conductive N15, a photosensitive layer 1116, and an insulating layer 17.
and a lamp 12 are arranged within this photosensitive drum 11. The transparent conductive layer 15 is formed by depositing a transparent conductive substance such as ITO on a transparent base material such as glass or acrylic resin, and
The photosensitive layer 16 is formed of an Ss+CdS+a-5i+ organic photosensitive material. As the image exposure means 1,
semiconductor laser.

Devices such as LED arrays and liquid crystal shutters are used. The lamp 12 for static elimination is a fluorescent lamp.

Use an LED array or the like.

During recording, the photosensitive drum 11 is rotated in the direction of the arrow (counterclockwise) in FIG. Head 4. Transparent conductive layer 1
Apply bias to 5. As a result, a latent image charge corresponding to the polarity of the bias is formed on the photosensitive layer 16, and at the same time, a charge having the opposite polarity to the latent image charge is injected into the ink surface of the ink head 4. Due to the electrostatic force of these charges 8 and 9, ink droplets fly and adhere to the recording paper 100, thereby recording a visible image. This recording can be achieved at high speed, and the photosensitive drum 11 also serves as a platen for conveying recording paper. Thereafter, the photosensitive drum 11 further rotates, and the latent image charge is erased by light irradiation from the charge eliminating lamp 12.

As described above, in the present invention, there is no need to provide a recording electrode on the ink head side as in the conventional case, so the structure of the ink head is simplified and there is no need to limit the specific resistance of the ink. Furthermore, line recording is also possible with a simple configuration consisting of only the photosensitive drum 11 and the image exposure means l.

FIG. 4 shows a second embodiment.

FIG. 4 is a side view showing the main structure of the recording apparatus of this example, and in the figure, 21 is a pressure roller. Note that the same symbols are used for the same members as in the previous example.

In this example, an ink image is formed on the photosensitive drum 11, and the ink image is transferred onto the recording paper 100, which is pressed against the photosensitive drum 1 by the pressure roller 21 and conveyed in the direction of the arrow (leftward). Ru. The functions of other parts are the same as in the previous example.

In this example, the same effect as in the previous example can be obtained.

(Effects of the Invention) As described above, according to the present invention, since the flight of ink droplets is controlled on the counter electrode side (transparent conductive layer side), the structure of the ink head is simple and it is easy to form a line. As a result, a high-speed and compact inkjet recording device can be realized.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a diagram explaining the principle of the present invention, Fig. 2 is a perspective view showing the outline of the structure of a recording device according to the first embodiment of the present invention, and Fig. 3 is an essential diagram of Fig. 2. FIG. 4 is a side view showing the main structure of a recording apparatus according to a second embodiment of the present invention. In the figure, 1 is an image exposure means (light source), and 2.11 is a photoreceptor. , 3 is a bias power supply, 4 is an ink head, 5 is a transparent conductive layer, 6 is a photosensitive layer, and 7 is an insulating layer.

Claims (1)

[Scope of Claims] Image exposure means ( 1), and the photoreceptor (2)
An ink head (4) is provided on the side of the insulating layer (7) facing the image exposure means (1), and a bias power source ( 3) A recording device characterized by providing.