JPS63154368A - Recorder - Google Patents

Abstract

PURPOSE:To maintain the resolution of recording and enable a large magnetic force to be obtained at an end part (a part for attracting a magnetic toner) of a magnetic body, by providing a recording head with a magnetic member for attracting a conductive magnetic toner on an image carrier by magnetic lines of force to form an electric circuit part and a plurality of electrodes or the like for selectively applying a voltage to the toner magnetically attracted. CONSTITUTION:By magnetic forces generated by barium-ferrite permanent magnets 20, 21, a conductive magnetic toner 24 electrostatically attracted onto a sheet 11 previously electrified is moved to a position beneath the first and second high-permeability magnetic bodies 15, 17, and is attracted onto tip parts of the bodies 15, 17 in the form of a brush, thereby forming an electric Circuit part 24'. When a pulsed voltage is applied to a sheet 11 by a pulse-driving circuit 22 through the electric circuit part 24' constituted of gold wires 23..., gold electrodes 16... and the toner 24, a part of the uniformly electrified sheet 11 is deprived of electrostatic charges, so that the toner 24 electrostatically attracted loses the attracting force, and is released by the magnetic forces, whereby a uniform record is obtained on the sheet 11.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a recording device that can be applied to, for example, an electronic whiteboard, and particularly to a recording device that can be applied to an image carrier such as a sheet that can accumulate electrostatic charges. This invention relates to an improvement in a recording device that records with conductive magnetic toner.

(Prior Art) Conventionally, a recording method as shown in FIG. 5 is known as an example of a recording apparatus that records with conductive magnetic toner on a sheet in which electrostatic charges can be accumulated.

In FIG. 5, 30 is a recording head, and 31 is a sheet as an image carrier formed by forming an insulating layer 37 on a conductive sheet 36. In FIG.

The recording head 30 includes a non-magnetic insulating base 32, a large number of conductive high permeability magnetic bodies 33 superposed on the non-magnetic insulating base 32, and these conductive high permeability magnetic bodies 33. . . . A pulse voltage power source 3 is connected to the conductive high permeability magnetic material 33 .
A pulse voltage is selectively applied via 5.

Note that 38 is a conductive magnetic toner.

Therefore, in the recording operation, first, the sheet 3
After the first insulating layer 37 is uniformly charged by a charging means (not shown), the conductive magnetic toner 38 is uniformly attracted by electrostatic force by a developer applying means (not shown).

Next, the sheet 31 to which the conductive magnetic toner 38 is attached
passes under the recording head 30. As a result, a part of the conductive magnetic toner 38 is attracted to the lower end portion of the conductive high permeability magnetic body 33 like a brush by the lines of magnetic force, thereby forming an electric circuit portion 38'.

At this time, the conductive sheet material 36 and the conductive high permeability magnetic body 3
3, the current flows through the conductive high permeability magnetic material 3.
3. The conductive magnetic toner flows through the toner 38 and the electrostatic charge is discharged. In the discharged area,
The conductive magnetic toner 38 that had been adhered to the sheet 31 by electrostatic force loses its adhesion force and is detached by the magnetic force of the magnet 34. Conductive sheet 36 and conductive high permeability magnetic material 3
3, when a DC pulse voltage is applied from the pulse voltage power source 35, the conductive magnetic toner 38 is induced to be charged with an electric charge corresponding to the energizer, and is deposited on the sheet 31. Therefore,
By selectively changing the pulse voltage power source 35 (UA) (ON/OFF) depending on the information to be recorded, it is possible to selectively adhere the conductive magnetic toner 38 and perform recording. Note that the detached conductive magnetic toner 38 is recovered by a recovery means (not shown).

As a result, the conductive magnetic toner 38 corresponding to the conductive high permeability magnetic material 33 to which the pulse voltage from the pulse voltage power supply 35 was applied is removed, and the conductive magnetic toner 38 to which the pulse voltage was applied is removed. The conductive magnetic toner 38 remains only in the portion corresponding to the magnetic material 33, that is, in the recording portion, and predetermined recording is performed on the sheet 31.

Further, as another example of the recording head 30, U.S.P.
-4402000Q, that is, as shown in Fig. 6, a large number of conductive high permeability magnetic materials 40... are sandwiched from both sides between two non-magnetic insulating substrates 42°42. , roughly, both of these nonmagnetic insulating substrates 42
．． There is a structure in which magnets 43 and 43 are arranged outside of 42.

Further, the conductive high permeability magnetic body 33 or 40 is
Approximately 50 to attract a certain amount of conductive magnetic toner 38
It has a thickness of about .mu.m, and is formed to have a width of about 50 .mu.m to increase recording resolution. That is,
As shown in FIG. 7, conductive high permeability magnetic material 33 (40
) is formed by etching, for example, into a needle shape with a width of about 50μ with a gap of 8 wires/m after bonding a conductive high permeability magnetic thin plate onto the non-magnetic insulating substrate 32 (42). Was.

(Problems to be Solved by the Invention) However, if the conductive high permeability magnetic material 33 (40) is formed into a needle shape by etching or the like as in the past, the cross section becomes trapezoidal, resulting in insufficient recording resolution. was there.

This is noticeable when the conductive high permeability magnetic thin plate is thick. Furthermore, if the plate thickness is thin, it is possible to reduce the trapezoidal shape, but the cross-sectional area becomes smaller, and therefore, the magnetic force necessary to attract the conductive magnetic toner 38 cannot be obtained sufficiently, and the recording resolution decreases. There was a drawback.

The present invention has been made in view of the above-mentioned problems, and its purpose is to prevent the end portion of the magnetic material (portion that attracts magnetic toner) from impairing recording resolution.
The purpose of the present invention is to provide a recording device equipped with a recording head that can obtain a large magnetic force.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has provided a method in which a conductive magnetic toner is attached onto an image bearing member capable of accumulating electrostatic charge, and a conductive magnetic toner is attached to an image bearing member facing the image bearing member. In the recording apparatus, the necessary recording is performed on the image carrier by removing conductive magnetic toner adhering to a portion of the image carrier corresponding to a non-recording portion using a recording head provided as a recording head. The above recording head is
A magnetic member that attracts the conductive magnetic toner on the image carrier using lines of magnetic force to form an electric circuit, and a magnetic member that is provided close to the magnetic member and selectively applies a voltage to the magnetically attracted conductive magnetic toner. This configuration includes a plurality of N poles that apply .

(Function) That is, the present invention separates the electrode, which is the conductive part of the recording head, from the magnetic part that forms the electric circuit part of the conductive magnetic toner. They can be easily manufactured at predetermined intervals by etching, and since the magnetic part can be used as a thin plate, the manufacturing method is simple, and at the same time, a sufficient area for magnetically holding the magnetic toner can be secured, ensuring stable recording characteristics. It becomes possible to obtain.

(Example) Hereinafter, an example of an eggplant according to the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1, numeral 10 is a recording head, and numeral 11 is a sheet as an image carrier, which is formed by forming an insulating layer 13 on a conductive sheet 12.

The recording head 10 has the following configuration. That is, 15 is the thickness of the insulating resin covered with i* 2oμm
The first high-permeability magnetic material is a thin plate-like magnetic member, and the surface thereof is deposited and etched to have a width of 5.
Gold electrodes 16 of 0 μm are formed in an array at intervals of 75 μm.

Reference numeral 17 denotes a second high permeability magnetic body as a thin plate-like magnetic member coated with an insulating resin similar to the first high permeability magnetic body 15, and the gold electrodes 16 are connected to the first high permeability magnetic body. It is fixed with an adhesive so as to be sandwiched between it and the body 15. Here, permalloy was used as a constituent material of the high permeability magnetic material 15°17.

Further, a first glass substrate 18 as a deep support substrate is placed outside the first high permeability magnetic body 15, and a second glass substrate 18 as a holding substrate is placed outside the second high permeability magnetic body 17. The glass substrate 19 is in a polymerized and bonded state.

Then, the first. On the outside of the second glass substrate 18.19, the first glass substrate 18. Barium ferrite permanent magnets 20 and 21 are provided to supply lines of magnetic force to the second high permeability magnetic body 15°17.

Further, a pulse drive circuit 2 is provided on the first glass substrate 18.
2 are provided and connected to the gold electrodes 16 through gold wires 23.

Thus, the conductive magnetic toner 24 attracted by electrostatic force onto the pre-charged sheet 11 due to the magnetic force of the barium ferrite permanent magnets 20 and 21 is directly below the first and second high permeability magnetic bodies 15 and 17. When moving to , these first. Second
The electrical circuit portion 24' is formed by being attracted like a brush to the tip of the high permeability magnetic material 15.17. At this time, the pulse drive circuit 22 causes the gold wire 23..., the gold electrode 16...
When a pulse voltage is applied to the sheet 11 through the electric circuit section 24' of the conductive magnetic toner 24, the uniformly charged part of the sheet 11 is neutralized, and the conductive magnetic toner 24, which had been attracted by electrostatic force, is no longer attracted. They lost their force and were separated by magnetic force, and a uniform record corresponding to 8 lines/mall was obtained on the sheet 11.

Next, a second embodiment will be described with reference to FIGS. 3 and 4.

In the figure, reference numeral 25 denotes a first barium ferrite magnet substrate as a magnetic member coated with an insulating resin, and a gold electrode 16 with a width of 50 μm is deposited on the surface of this substrate by vapor deposition and etching.
... are formed in an array at intervals of 75 μm. 26
is a second barium ferrite magnet as a thin plate-shaped magnetic member coated with an insulating resin similar to the first barium ferrite magnet substrate 25, and gold electrodes 16 are connected between the first barium ferrite magnet 25 and It is fixed with adhesive so that it is sandwiched between the two.

Further, the first barium ferrite magnet substrate 25 is bonded to the glass substrate 18, and the first barium ferrite magnet substrate 25. The gold-Ti poles 16... and the second barium ferrite magnet 26 are held integrally.

Further, a pulse drive circuit 2 is provided on the first glass substrate 18.
2 are provided and connected to the gold electrodes 16 through gold wires 23.

Further, the tip of the recording head 10 is tapered to have a width of 50 μm.

However, the first. The sheet 11 is pre-charged by the magnetic force of the second barium ferrite permanent magnet substrate 25 and 26.
The conductive magnetic toner 24 attracted by electrostatic force to the top of the first.
2nd 1st. Second barium ferrite permanent magnet substrate 2
5. When moved directly below 26, it is sucked into these tips in a brush-like manner to form an electric circuit section 24'. At this time, the pulse drive circuit 22 causes the gold wire 23..., the gold electrode 1 to
6...

When a pulse voltage is applied to the sheet 11 through the electric circuit section 24' of the conductive magnetic toner 24, the uniformly charged part of the sheet 11 is neutralized, and the conductive magnetic toner 24, which had been attracted by electrostatic force, is removed by the attraction force. It lost its magnetic field and was separated by magnetic force, and a uniform record corresponding to 8 records per shoe was obtained on the sheet 11.

In the above-described embodiments, the electrodes sandwich the magnetic member, but they may be provided on only one side, as long as they are close to each other. In addition, although a glass substrate was used as the holding substrate,
An alumina substrate, a resin substrate, etc. may be used.Although barium ferrite ceramic magnets were used as permanent magnets, alnico, rare earth cobalt magnets, plastic magnets, etc. may also be used.Permalloy was used as a high magnetic permeability material, but superma etc. is also fine.

In addition, it goes without saying that the present invention can be modified in various ways without departing from the gist of the present invention.

[Effects of the Invention] The present invention separates the electrodes, which are the conductive parts of the recording head, from the magnetic parts, and the electrodes can be easily etched at predetermined intervals by etching Igl prepared by vapor deposition, sputtering, etc. Moreover, since the magnetic part can be used as a thin plate, the manufacturing method is easy, and at the same time, a sufficient area for magnetically holding the magnetic toner can be secured, and stable recording characteristics can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing an embodiment of the present invention, Fig. 2 is a plan view of the main parts, Fig. 3 is a longitudinal side view showing a second embodiment of the invention, and Fig. 4 is the same. FIG. 5 is a plan view of the main parts, FIG. 5 is a vertical side view showing a conventional example, the sixth factor is a perspective view showing another conventional head, and FIG. 7 is an enlarged view of the end of the conventional head. 1o... Recording head, 11... Image carrier, 15°1
7... Magnetic member, 16... Electrode, 24... Conductive magnetic toner, 24'... Electric circuit section. Applicant's agent Patent attorney Takehiko Suzue Figure 2
Figure 4 Figure 3 Figure 5 Figure 6 Figure 7

Claims (4)

[Claims] (1) Conductive magnetic toner is deposited on an image carrier capable of accumulating electrostatic charge, and is deposited on a portion of the image carrier corresponding to a non-recording portion by a recording head provided opposite to the image carrier. In the recording apparatus, the recording head performs necessary recording on the image carrier by removing the conductive magnetic toner on the image carrier. a magnetic member that forms a section, and a plurality of electrodes that are provided close to the magnetic member and selectively apply a voltage to the magnetically attracted conductive magnetic toner. recording device. (2) The recording device according to claim 1, characterized in that a plurality of electrodes are sandwiched between two magnetic members. (3) The recording device according to claim 1 or 2, wherein the plurality of electrodes are electrically insulated from the magnetic member by an insulating thin film. (4) The recording device according to any one of claims 1 to 3, wherein the magnetic member is made of a high permeability magnetic material or a permanent magnet material.