JPS63243971A - Image recorder - Google Patents

Abstract

PURPOSE:To improve transfer efficiency and to permit use of color toners by using a conductive brush to which a developing bias is impressed from a developing bias source to execute electrostatic charging of a photosensitive body and electrostatic charging of the insulating layer. CONSTITUTION:A conductive cylindrical roller 16 in proximity to the photosensitive body 11 is provided to a developing device 15 and the conductive brush 17 is flocked on the surface of the roller 16. The developing bias is impressed from the developing bias source 21 to the brush 17. The brush 17 makes contact friction with the surface of a photosensitive layer 14 by rotation of the roller 16 and the injection of the electric charge from the brush 17 to the layer 14 is executed, by which the charge potential is increased and the charge potential necessary for the development is obtd. The insulating toner 19 comes into contact with the brush 17 impressed with the developing bias, by which the charge of the same polarity as the polarity of the developing bias is transferred and charged to the toner 19. The transfer efficiency is improved and the use of the color toners is permitted by using the brush 17 to execute the charge to the layer 14 of the body 11 and the charge of the toner 19 in such a manner.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to an image recording apparatus that performs development using a conductive brush.

``Prior Art'' Conventionally, a recording method using a photoreceptor having a transparent conductive layer and a photoconductor layer provided on a transparent support and performing image exposure from the side of the transparent support is disclosed in Japanese Patent Application Laid-Open No. 58-98746. Showa 58-1
53957 has been proposed. The development of these methods is
A conductive component toner is used, a voltage is applied between the developer and the photoreceptor, and light is irradiated from the side of the transparent support by exposing the developer to a light source such as a laser or LED (light emitting diode). Toner is attached to the area, and exposure and development are performed at the same time. It also serves as a cleaning agent.

In this conventional developing method, the toner is easily charged by using a conductive toner.

However, when a conductive toner is used, when it is transferred to plain paper (low resistance), the charge of the toner escapes to the lower side, weakening its adhesion to the paper, and resulting in extremely poor transfer efficiency.

When an insulating toner is used, the problem arises that development cannot be performed because the toner is not charged.

Also, when I tried to make it in color, Y (Yeloku),
It is extremely difficult to produce conductive magnetic toners of the three colors M (magenta) and C (cyan).

In other words, it is difficult to include a magnetic material without impairing color development.

On the other hand, in the above development method, two-component development (consisting of toner and carrier) can be considered. The developing device also serves as a cleaner, and in order to perform the cleaning, the carrier conveyance speed is increased and the scraping force is increased. However, there is a problem in that background smearing is caused by scattering of the carrier, and carrier replenishment is required due to the scattering.

An object of the present invention is to provide an image recording apparatus that solves the problems of transfer efficiency and colorization.

"Means for Solving the Problems" According to the present invention, a transparent electrode and a photoconductor layer are sequentially formed on a transparent support to form a photoreceptor, and a voltage is applied between the photoreceptor and a developing device. 44 from the transparent support side using an exposure device
In an image recording device that performs seven-fill half-image exposure, deposits toner on the area irradiated with light, and transfers the deposited toner to recording paper, the developing device has conductive fibers planted on a conductive roller. A developing bias source is connected to the brush, and the brush is rotated while being connected to the photoconductor layer, and the insulating toner is supplied onto the photoreceptor by rotation of the brush. ing.

As described above, the main features of this invention are supplying toner to the conductive brush and rotating the conductive brush while applying a voltage to bring it into contact with the photoconductor layer. The difference is that a conductive brush is used.

"Example" The first picture is a diagram explaining the present invention in detail, in which a photoreceptor 11 has a transparent electrode 13 formed on a transparent support 12, and a photoconductor layer 14 formed thereon. It has a cylindrical shape as a whole.

The developing device 15 includes a conductive cylindrical roller 16 close to the photoreceptor 11, and a conductive brush M is provided on the surface of the cylindrical roller 16.
-17 is planted. Toner from the toner container 18 is conveyed to the surface C2 of the photoreceptor 11 by rotation of the plan 17. A developing bias is applied to the conductive brush 17 from the developing bias #21.

An exposure device 22 using a light emitting diode array (a laser, a liquid crystal shutter, etc.) performs image exposure from the side of the transparent support 12 to the developing device 15 through a SELFOC lens, and toner adheres to the exposed area of the photoreceptor 11. . After development, the toner 198 adhering to the photoreceptor 11 is transferred onto the recording paper 24 by the transfer conductive roller 23 . A transfer bias is applied from a transfer bias source 25 to the transfer conductive roller 23 with a polarity opposite to the charging polarity of the toner 19a.

The residual toner 19b after the transfer is transported to the developing device 15C and collected. Although roller transfer is used as the transfer means in FIG. 1, a corona transfer method may also be used. More brush 1
7 and the rotation direction of the photoreceptor 11 are reversed, but they may be in the same direction.

FIG. 2 shows the principle of toner adhesion.

The conductive brush 17 contacts and rubs the surface of the photoconductor layer 14 as the conductive cylindrical roller 16 rotates. Conductive brush 17
Since a developing bias is applied to , charge is injected from the conductive brush 17 to the photoconductor layer 14, and the charging potential increases. In the charging area 27, the potential increases from the side that is in contact with the brush 17 for a longer period, that is, from the right side to the left side in FIG. 2, and the magnetic potential required for development is obtained at the left end.

On the other hand, when the insulating toner 19 comes into contact with the conductive brush 17 to which a developing bias is applied, an electric charge having the same polarity as the developing bias is transferred to the insulating toner 19 and is charged. Second
In the figure, since the developing bias source 21 is negative, the insulating toner 19 is negatively charged.

When the developing bias source 21 is made positive, the insulating toner 19 is positively charged. When the exposure device 22 irradiates light to the left end of the charged region 27, that is, the position where the potential has increased the most, positive charges are drawn to the surface of the photoconductor layer 14, lowering the negatively charged surface potential. The insulating layer 19 existing in the vicinity of the area where the surface potential has decreased causes a reversal phenomenon in the photoconductor layer 1.
It adheres to the surface of 4. Since the irradiation position of the exposure device 22 is the position immediately before the conductive brush 17 and the photoconductor layer 14 are separated, the attached insulating toner 198 is exposed to the conductive brush 1.
7 is hardly scraped off. Further, the residual toner 19 remaining after the transfer is removed from the developing device 15 by the rotation of the conductive brush 17.
will be collected and reused.

FIG. 3 shows the shape of the fiber 28 used in the conductive brush 17. The figure A shows a case where the fiber 28 is a cylindrical thin wire.

In Figure B, the fiber 28 has an uneven surface.

This is a case where the toner is easily charged by increasing the contact with the insulating toner 19, and the scattering of the insulating toner 19 is prevented by being caught by the insulating toner 19.

"Effects of the Invention" As explained above, according to the present invention, since a conductive brush can be used to charge a photoconductor and an insulating toner, transfer efficiency can be improved, and color toner can be charged. There are advantages such as being able to

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the invention, FIG. 2 is a diagram explaining the operating principle of the invention, and FIG. 3 is a diagram showing an example of fibers of a conductive brush. Patent applicant Nippon Telegraph and Telephone Corporation Representative Kusano In the car 1 time 15 Developing equipment 3 Ports B

Claims (1)

[Claims] (1) A transparent electrode and a photoconductor layer are sequentially formed on a transparent support to form a photoreceptor, a voltage is applied between the photoreceptor and a developing device, and image exposure is performed from the transparent support side using an exposure device. In an image recording apparatus that deposits toner on an area irradiated with light and transfers the deposited toner to recording paper, the developing device has a conductive roller in which conductive fibers are planted to form a brush; A development bias source is connected to the brush, the brush is rotated while in contact with the photoconductor layer, and the rotation of the brush supplies insulating toner onto the photoreceptor. Features of the image recording device.