JP2854419B2 - Recording head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording head for realizing a high quality recorded image.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing the construction of the prior art, wherein 1 is an ion flow control plate, 2 is an insulating substrate having a hole penetrated in the center, and 3 and 4 are ions having a hole penetrated in the center. A control electrode, 5 is a shield electrode, 6 is an ion generating wire electrode, 7 is an ion source, 8 is an ion control circuit, and 9 is a recording sheet. 219
No. 071). In order to operate this, 5 to 10 kv is applied between the shield electrode 5 and the ion generating wire electrode 6.
The flow of the ion flow generated by applying a high voltage of the order is electrically controlled by the voltage applied to the ion flow control plate 1 from the ion control circuit 8, and the ion flow control plate 1
The recording sheet 9 is irradiated with ions passing through the center hole of the recording paper 9 to form an electrostatic latent image on the recording sheet 9. This electrostatic latent image is visualized by general toner development and recording is completed.

[0003]

In such a prior art, the portions of the ion flow control plate 1 other than the electrodes, that is, the inner surface of the hole and both surfaces of the ion flow control plate 1 are not covered with the electrode pattern. Charges are likely to be accumulated by the ions from the ion-generating wire electrode 6 in a portion or the like, and as a result, the potential on the surface of the insulating substrate 2 rises irregularly. -It has the drawback that it exerts a long force and inhibits the normal flow of ions, resulting in a decrease in recording density and uneven recording.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording head which solves the problems such as reduction in density due to charge accumulation on an ion flow control plate and occurrence of recording unevenness.

[0005]

The recording head according to the present invention uses an insulating substrate entirely made of a weakly conductive material.

[0006]

In the present invention, even if ions adhere to the ion flow control plate, the insulator substrate itself is made of a weakly conductive material, so that the ions escape to the ion control electrode.
No accumulation of ions occurs.

[0007]

FIG. 1 is a cross-sectional view of a recording head for explaining the principle of the present invention, wherein 1 is an ion flow control plate, 2 is an insulator substrate, 3 and 4 are ion control electrodes, and 5 is a sheath. Reference numeral 6 denotes an ion generating wire electrode, 7 denotes an ion source, 8 denotes an ion control circuit, 9 denotes a recording sheet, and 10 denotes a weakly conductive film.

With such a structure, the electric charge of the ions arriving at portions other than the ion control electrodes 3 and 4 of the ion flow control plate 1 is transmitted through the weakly conductive film 10 and the ion control electrodes 3 , 4 as a result, harmful charge accumulation on the insulator surface is unlikely to occur, and as a result, it is possible to prevent the ion flow flowing in the hole from being adversely affected.

The electrical properties of the weakly conductive film 10 include:
The leakage current between the ion control electrodes 3 and 4 of the ion flow control plate 1 due to the addition of the weakly conductive film 10 causes the heat generation of the ion flow control plate 1, the spark current between the electrodes, and the ion control circuit 8.
What is necessary is just to have conductivity which does not cause a side effect such as an increase in the load. For example, ideally, a surface resistance value of about 108 to 109Ω is ideal, but outside this range, for example, 105 to 1012Ω. Even if it is used, it can be used depending on the configurations of the ion flow control plate 1 and the ion control circuit 8.

In the above description of the principle, the weak conductive film 10 is used, but in practice, reproducibility is difficult. Therefore, in the present invention, the insulator substrate 2 itself has a weak conductivity. As a method for obtaining such a weakly conductive image-constant substrate, for example, a method in which conductive particles are mixed in an insulating material is possible, and as a specific example, carbon fine powder is mixed in a polyimide material. A method using a substrate material can be used.

The present invention shows a particularly remarkable effect in, for example, an ion flow control plate having a matrix configuration as shown in FIG. 2A is a plan view of the ion flow control plate 1 on the recording paper 9 side, and FIG. 2B is a plan view of the ion flow control plate 1 on the ion source 7 side. In the ion flow control plate 1 having such a structure, for example, an exposed portion of the insulator substrate 2 necessarily exists between the electrode patterns of the ion control electrodes 3 and 4 in FIG. Electric charges are accumulated in such places as shown in the cross section in FIG. In such a case, if the structure of the present invention is implemented as shown in FIG. Charge accumulation is prevented, and deterioration of recording quality can be prevented.

[0012]

As described above, since the present invention uses an insulating substrate made entirely of a weakly conductive material, it has the effect of preventing harmful charge accumulation on the ion flow control plate. , And high-quality recording without the temporal change of the characteristics of the recording head. In addition, since the insulator substrate itself is weakly conductive, there is an advantage that a process for reducing the conductivity later is not required.

[Brief description of the drawings]

FIG. 1 is a sectional view of a recording head for explaining the principle of the present invention.

FIG. 2 is a plan view showing an example of a practical arrangement of electrode patterns according to the present invention.

FIG. 3 is a sectional view showing the configuration of a conventional recording head in a practical electrode pattern.

FIG. 4 is a sectional view showing a configuration of an embodiment of a practical electrode pattern of the present invention.

FIG. 5 is a cross-sectional view illustrating a configuration of a conventional recording head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ion flow control board 2 Insulator substrate 3 Ion control electrode 4 Ion control electrode 5 Shield electrode 6 Ion generation wire electrode 7 Ion source 8 Ion control circuit 9 Recording paper 10 Weak conductive film

Continuation of the front page (72) Inventor Taniyuki Hoshino 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-63-304036 (JP, A) JP-A-62- 126506 (JP, A) JP-A-2-4539 (JP, A) JP-A-57-37365 (JP, A) JP-A-56-164359 (JP, A) JP-A-61-151557 (JP, A) Hikaru 1-122941 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B41J 2/415 G03G 15/05 H05K 1/03 610

Claims (1)

(57) [Claims] 1. A recording head for forming an electrostatic latent image by irradiating an ion stream generated by an ion stream generator on an opening of an ion flow control plate composed of an insulator substrate and an electrode plate to a recording medium. A recording head, wherein an insulating substrate made entirely of a weakly conductive material is used as the insulating substrate.