JPS59142568A - Transfer type electrostatic recording device - Google Patents

Abstract

PURPOSE:To obtain a recording device having a variegated function by constituting so that a desired recording picture is obtained by not only an electric recording but also an optical recording. CONSTITUTION:In case of executing an electric recording by a multi-stylus electrode head 3, the surface potential of a recording body 2 is electrostatically charged, for instance, by -400V by an electrifier 1. Subsequently, an electrostatic latent image is formed on the recording body 2 by giving the potential corresponding to a picture information VD to each stylus of the head 3. In this case, pulse voltage of +300V is applied. In case of copying an original 10 on a platen 9 by anoptical write system 13, it is electrostatically charged by -400V in the same way by the electrifier 1, and a latent image is formed by scanning a picture by a movement of a light source 11 of the system 13, etc. In this way, the latent image formed on the recording body 2 is developed in a developing part 4, and transferred to a transfer paper 6 by a transfer electrifier 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transfer type electrostatic recording device, and more particularly to a transfer type electrostatic recording device capable of obtaining recorded images of desired Hf using either an electrical method or an optical method. .

Generally, a transfer-type electrostatic recording device that performs all image formation using a multi-needle electrode head (multi-stylus) is constructed as shown in FIG. The multi-needle electrode head 3 is charged with a charge corotrone and maintained at a slight distance from the surface of the recording body 2. A pulse voltage of opposite polarity to the previously charged one is applied in accordance with the image information VD. By generating discharge and removing or reducing the pre-charged charges, an electrostatic latent image corresponding to the image information VD is formed, and this is developed by the developing device 4, and then
The image is transferred onto a transfer paper 6 by a transfer corotron 5. After the transfer, the toner remaining on the recording medium 2 is removed by the cleaner 7, and the residual latent image is erased by uniform discharge by the static eliminating corotron 8, and the next image forming cycle begins.

and C are generally used when optical writing is required in addition to transfer-type electrostatic recording as described above. However, the conventional transfer type electrostatic recording described above only forms an electrical latent image using the multi-needle electrode head 3, and cannot perform writing using light.

Therefore, in such cases, an optical recording device is required.

This invention has been made in view of the above circumstances, and is a transfer type electrostatic recording device that is capable of obtaining a desired recorded image not only by electrical recording using a multi-needle electrode head but also by optical recording. The purpose is to provide

That is, the present invention provides a recording medium on which an electrostatic latent image can be formed by either an electrical method or an optical method by using a three-layer structure consisting of a support, a low-resistance layer, and a dielectric material having photoconductivity. A means for forming a desired electrostatic latent image on the recording medium, and selectively energizing a plurality of needle electrodes in accordance with image information. The device includes a multi-needle electrode head for forming a desired latent image, and a light confinement means for forming the latent image using light.

81'', ``9'', and ``C'' denote a light enrichment thread or a laser scanner, which consists of a light source and an exposure device in a conventional copying machine.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The transfer type electrostatic recording device according to the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

FIG. 2 shows the internal structure of a recording medium used in the transfer type electrostatic recording device according to the present invention.

That is, this recording medium has a low resistance layer 2-1 on a support 2-1.
It has a three-layer structure in which a dielectric material 2-3 having photoconductivity is further laminated thereon. Support 2-
As the material 1, PET (polyethylene terephthalate film) is used.As the low resistance layer 2-2, a mixture of carbon black and urethane resin is used.
PVA (poly vinyl alcohol or SnO)
A material such as L-tin oxide coated with an appropriate coating is used, and its surface resistivity is adjusted to around 10' to 107 Ω. Also, a dielectric material 2-3 having photoconductivity
Bind or z.

(composed of zinc oxide J and a binder (binding agent),
Alternatively, a suitable coating such as Cd5 (cadmium sulfide) or anelfa silicon is used, and its dark resistance is adjusted to around 1012 to 10"27. Note that in this example, the above-mentioned The thickness of each layer is 75 pm for the support layer 2-1 and 20± for the low resistance layer 2-2.
The thickness was 5 μm, and the dielectric layer 2-3 was 2 μm above 6.

FIG. 3 shows an embodiment of the transfer type electrostatic recording device according to the present invention. In this embodiment, the present invention is applied to a printer with a copying function. Components that are the same as those shown in FIG. 1 are designated by the same reference numerals 1 and 9, and redundant explanation will be omitted.

That is, in the present embodiment, by employing the recording body 2 shown in FIG. 2, a printing function corresponding to the image information VD, a light source 11, and an appropriate lens system 12 are provided.
A platen 9 with an optical writing means 13 comprising:
The configuration is such that the same device can perform two functions, including the function of copying the document 10 placed thereon. - Hereinafter, the specific operation of the device of this embodiment will be explained in detail.

First, a case where electrical recording is performed using the multi-needle electrode 3 will be described.

The surface potential of the recording medium 2 is charged by the charge corotron 1 to, for example, -400V. Next, by applying a voltage corresponding to the image information VD to each needle electrode of the multi-needle electrode head 3, an electrostatic latent image corresponding to the image information is formed on the recording medium 2.

The voltage applied at this time is O■ for the image area and +30 for the non-image area.
Assume that the pulse voltage is 0V. It is assumed that the multi-needle electrode head 3 has 16 needle electrodes (80 μmφ) arranged in a staggered manner per 111111 in order to correspond δ to the degree of image consistency in the copying operation by the optical writing means 13. By applying a pulse voltage to the multi-needle electrode, the surface level of the recording medium 20 becomes 1400V in the image area, and the L car 250V in the non-image area due to the influence of carrier mobility, etc.
Thus, a suitable electrostatic contrast could be obtained.

Next, the latent image is visualized by attaching toner having a load opposite to the latent image to the image area of the recording medium 2 using the developing device 4 which is biased to a developing bias of about -300V.

The toner image formed on the drum body 2 is then transferred to a transfer paper 6 by a transfer corotron 5, and the toner remaining on the recording medium 2 after the transfer is removed by a cleaner 7.
Further, the residual latent image is erased by uniform exposure by the static eliminating corotron 8, and the surface potential of the recording medium 2 becomes OV. Thereafter, the next image forming cycle begins.

The image density of the transfer paper 6 obtained in this way is ID (Image DensityJ = 1.1) in the image area.
As mentioned above, 1p = o, oz or less in the non-image area and good recording quality can be obtained! ! 'fC.

Next, the operation of copying the copy original 10 on the platen 9 using the optical writing system 13 will be explained.

Similarly to the above, the surface potential of the recording medium 2 is charged to -400V by the charge corotron 1.

Next, image recording of the original 10 is performed by moving the platen 9 or moving the light source 11 of the optical writing system 13, etc.
A latent image corresponding to the image of the document 10 is formed on the recording medium 2. Note that by using the entire recording medium 2 such as fc shown in FIG. 2, the black part with ID=1.2 or more in the image of the original 10 will be about 400V, and the white part with IL)=0-05 or less will be about 400V. The voltage was about 250V, and good electrostatic contrast could be obtained.

Next, in the same manner as described above, the electrostatic latent image τ is developed by the developing device 4, and the toner image formed on the recording medium 2 by the development is further transferred onto the transfer paper 6 by the transfer corotron 5. After this transfer, the toner remaining on the recording medium 2 is removed using an IJ-7, and then the static electricity removal corotron 8 is removed.
The residual latent image is erased by uniform exposure, and the next image forming cycle begins.

The image density of the transfer paper 6 obtained in this way is 10
"ID=1.2 or more" in the image of "color part is ID=1.2".
ID=(10
2 or less, the gray area in between is ID = 0.02 to ID =
It was possible to reproduce the image to a halftone of 1.1, and obtain a good recording material.

In this embodiment, a Gould-type multi-needle electrode head in which the control electrode is formed on the same surface as the needle electrode is illustrated, but a Phillips-type one in which the control electrode is formed on the back surface of the recording medium 2 is used. Of course, this is a good thing.

In addition, in this embodiment, by using an optical writing system in a conventional copying machine as an optical recording means, the apparatus of this embodiment has an increased copying capability. Any other means, such as a laser scanner, may be used as long as it is capable of doing so. The point is that the latent image forming means on the recording medium may be provided with an appropriate optical recording means in addition to the electric means using a single multi-needle electrode head.

As explained above, according to the transfer type electrostatic recording device according to the present invention, a desired recorded image can be obtained not only by electrical recording but also by optical recording.
It becomes possible to realize a recording device with a variety of functions.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the general configuration of a conventional transfer type electrostatic recording device, FIG. 2 is a sectional view showing the internal structure of a recording body in the transfer type electrostatic recording device according to the present invention, and FIG. FIG. 1 is a schematic diagram showing an implementation of a transfer type electrostatic recording device according to the present invention. 1°°Charge corotron, 2...recording body, 2-
DESCRIPTION OF SYMBOLS 1...Support, 2-2...Low resistance layer, 2-3.
・・Electric body with original conductivity, 3. Multi-needle electrode head, 4. Developing machine, 5. Transfer corotron, 6. Transfer paper, 7. Cleaner,
8... Static elimination corotron, 9... Platen,
lO...Original, 11...Light source, 12...
Lens system, 13... Optical writing system.

Claims (1)

[Claims] Dielectric N consisting of a low resistance layer and a photoelectric material on a support
A recording body formed by layering 1 and 1, a multi-needle electrode head that forms an electrostatic latent image on the recording body by selectively energizing the pin electrodes, and a multi-needle electrode head that forms an electrostatic latent image on the recording body with light. 1. A transfer type electrostatic recording apparatus, comprising: a light immersion means for forming an electrostatic latent image, and selectively driving one of the multi-needle electrode head and the light immersion means.