JPS6278574A - Image forming device - Google Patents

Abstract

PURPOSE:To make the size of a device compact and to make wiring easy by providing a driving circuit in parallel along a recording electrode on a non- magnetic cylinder and connecting them by a member having plural apertures. CONSTITUTION:A recording electrode 4 and a driving circuit 9 are connected by a flexible printed substrate 10. The side of the flexible printed substrate 10 close to the recording electrode is allowed to contact with or bonded to a non-magnetic cylindrical member 3 and apertures 11 are provided side by side in this part though the substrate is bent in halfway and separated from the non-magnetic cylindrical member 3. Toner for image forming passes through the apertures and is circulated on the non-magnetic cylindrical member 3 by the rotation of an incorporated magnet.

Description

Detailed Description of the Invention (Technical Field to Which the Invention Pertains) The present invention relates to an image forming apparatus, particularly an image forming apparatus that applies a voltage between a recording electrode and a recording medium, and causes image forming particles 7- (toner) therebetween to adhere to the recording medium. It relates to image forming devices such as printers and display devices.

(Prior art) As such an image forming method, Japanese Patent Publication No. 51-4670
There is a method known from Publication No. 7, etc. In this method, as shown in FIG. 2, conductive magnetic toner l is conveyed through a non-magnetic cylinder 31 by a rotating magnet 2, and passed through a recording electrode 4F made of a magnetic material. Then, a voltage is applied between the conductive layer 7 of the recording medium 5 having an insulating layer on the surface and the recording electrode,
An image is formed by depositing toner on a recording medium.

(Problem that IJJ is trying to solve) The configuration using this method is a very compact configuration and has various advantages, but its major drawback is that it cannot be divided into drives, that is, it cannot be used independently for all recording electrodes. It may be necessary to continue applying voltage for image formation. Therefore, it is necessary to provide the recording electrode and the lead line for the number of times so as not to interfere with the conveyance of the toner.

Conventionally, for this purpose, the lead wire was connected to a non-magnetic cylinder 31.
It is considered to take it out in the axial direction by adding -.
An example of this is shown in FIG. 3. In this example, the recording electrodes 4 are connected in unit units to a lead wire 8 made of a flexible printed circuit board, and the lead wire is bent by a non-magnetic cylinder 3L and taken out in the axial direction.

However, with this method of dividing and connecting each block, it is difficult to achieve high precision in the joints of the electrodes, and the process of connecting the lead wires, which are taken out in the axial direction in an overlapping manner, to the drive circuit becomes complicated. Another idea is to integrate the recording electrode and drive circuit and attach it to the non-magnetic cylinder 1-, but it is difficult to mount all the necessary parts on the non-magnetic cylinder to a thickness that does not interfere with toner transport. Accompany.

The present invention eliminates the drawbacks of the prior art described above.

This provides a new connection method between recording electrodes and drive circuits.

(Means for Solving the Problems) The present invention provides an opening in a connecting portion for electrically connecting a rotating magnet, a cylindrical member covering it, a large number of recording electrodes on the surface of this cylindrical member, and a drive circuit for this recording electrode. Or provide a gap,
Toner that has crossed the recording electrode or has not yet reached the recording electrode is conveyed to the downstream side through this opening or gap.

(Embodiment) FIG. 1 shows an embodiment of the present invention, in which a recording electrode 4 and a drive circuit section 9 are connected by a flexible printed circuit board IO. This flexible printed circuit board 10 is in contact with or adhered to the non-magnetic cylindrical member 3 on the side closer to the recording electrode 4, and is bent in the middle and separated from the non-magnetic cylindrical member 3, but an opening 11t-1 is provided in the hollow part. . The wiring is opened as shown in the figure.The toner for forming an image bypassing the opening 111 circulates on the non-magnetic cylindrical member through this opening by the rotation of the magnet contained therein.

Although it depends on the particle size of the toner, the size of this opening can be set quite freely, and it has been confirmed that 41 fi can be satisfactorily set within the range of about 0.2 to 10s+1. Also,
The interval between the openings can also be approximately 0.5 to twice the diameter of the openings. As a specific forming method, a drill or mechanical machining f stages of a punch book can be used. Furthermore, although it is possible to connect the recording electrode and the flexible substrate by soldering or conductive adhesive, it is also possible to connect the recording electrode to the flexible substrate by plating or
It is most desirable to form the recording electrodes in stages to improve accuracy, but wiring work can be almost eliminated by forming the connections for electrical components such as drive circuits in straight lines on the flexible substrate.

(Other Examples) Figure 1 shows an example in which a flexible printed circuit board is used to facilitate wiring between the recording electrodes and the drive circuit. Attachment is 1 of etc.
An example of this is shown in FIG. 5, in which the toner can circulate through the gap 13 between the insulation-coated wires 9a. In this case, wiring work or the drive circuit is a hard printed circuit board 1.
2L and can be provided close to the non-magnetic cylinder along its longitudinal direction as in the case of FIG. 1, so it does not take up any extra space and the size of the cylinder can be kept compact.

In the father's crime example, the toner was configured to pass through the opening after passing through the recording electrode, but an opening may be provided on the first flow side of the recording electrode in the direction of toner movement. Fll, 11 can be provided as a member for regulating the toner supply amount 1 at a constant level.

FIG. 4 shows another embodiment of the aperture, in which the aperture 11 is shown in FIG.
Although an example in which the openings are arranged in a row is shown, they may be arranged in a staggered manner as shown in FIG.

(Effects of the Invention) As described above, the drive circuits are provided in a row along the recording electrodes on the non-magnetic cylinder, and the drive circuits are connected by a member having a plurality of openings.

The size of the device can be made compact and wiring is extremely easy.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view of an image recording section according to an embodiment of the present invention;
FIG. 2 is a schematic sectional view showing an example of an image recording method to which the present invention is applied, FIGS. 3 and 5 are perspective views showing a conventional example of an image recording section, and FIG. 4 is another embodiment of the present invention. FIG. 3 is a top view of an opening showing an example. In the figure, ■ is toner, 2 is a magnet, 3 is a non-magnetic cylinder,
4 is a recording electrode, 5 is a Q member, and 11 is an aperture.

Claims (2)

[Claims] (1) A recording electrode consisting of a rotating magnet, a cylindrical member that covers it, a number of recording needles on the surface of this cylindrical member, a drive circuit that applies a signal voltage to the recording electrode, and a recording that moves relatively close to the recording electrode. 1. An image forming apparatus comprising a member, wherein a connecting portion between a recording electrode and a drive circuit has an opening or a gap, and toner is circulated through the opening or gap. (2) The image according to claim (1), wherein the connecting portion is formed by drilling holes in a row in a flexible printed circuit board and forming a conductive pattern by bypassing the holes. Forming device.