JPS59133074A - Electrostatic recording head - Google Patents

Abstract

PURPOSE:To make it possible to adhere a spacer having high lubricity and low adhesiveness in high productivity, by adhering the spacer for holding a constant air gap to a discharge surface to a head surface at one surface treated surface thereof through an adhesive. CONSTITUTION:A spacer 10 contacted with a control electrode 3 is adhered to the surface of a recording head 100 in order to hold a constant gap from a recording body. This spacer 10 comprises a plastic film 11 having high slip property and inferior to the wettability with an adhesive 12 because of low surface energy and has no sufficient adhesive force. Therefore, a polyester film with a thickness of 4mum is used as the film 11 to be immersed in a 20% caustic soda solution and, after washing, the treated film is further immersed in a dilute aqueous stannous chloride solution and, after washing and drying, the treated film is adhered to the surface of the control electrode 3 except a needle electrode 2 by the adhesive 12. As a result, adhesive force about 18 times as compared with that of the untreated film can be obtained. By this method, adhesive productivity can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to an electrostatic recording head in which workability of a spacer for maintaining an appropriate air gap between a needle electrode and a charge receptor is improved.

(B) Prior art A conventional electrostatic recording head, for example, as shown in FIG. a stylus 2 disposed with an air gap 4 for corona discharge to (charge receptor) 1; in front of the stylus 2;
a control electrode 3 arranged at a predetermined interval behind (with respect to the moving direction of the recording medium 1) and to which a predetermined DC bias voltage is applied; and a spacer coating the surface of the control electrode 3 leaving the air gap 4. It consists of 5.

In the above configuration, when forming the spacer 5, after fixing the stylus 2 and the control electrode 3 with a resin 6 or the like, the surface of the stylus 2 is masked with an adhesive tape 7 as shown in FIG. 2(a). After coating the entire surface of the recording head with Teflon resin or the like to a thickness of 5 to 10 μm as shown in FIG. 2(b) by spraying or coating, adhesive tape 7 is applied as shown in FIG. 2(e). The coating is completed by peeling it off and polishing the coated surface.

In the electrostatic recording head described above, since the spacer 5 is made of a Teflon-based resin with a highly slippery surface, the frictional resistance with the recording medium 1 is reduced, improving sliding properties, and recording Providing an appropriate discharge gap between the body traces contributes to improved operability.

However, in the conventional electrostatic recording head, as shown in Fig. 2 (,
As shown in ) to (c), since the spacer 5 is formed through a plurality of relatively troublesome steps, productivity is not increased, which limits cost reduction.

(c) Object and structure of the invention The present invention has been made in view of the above-mentioned problems.In order to prevent Si production and reduce the cost, a spacer material having low adhesion due to high slipperiness is surface-treated. The present invention provides an electrostatic recording head that has improved adhesiveness and is bonded to the head surface.

(2) Example The electrostatic recording head according to the present invention will be described in detail below. Figure 3 shows an embodiment of the present invention, and the same parts as in Figure 1 are indicated by the same reference numerals, so redundant explanation will be omitted. However, conventionally,
The spacer 10 is different from that shown in FIG. 1 in that the spacer is formed by spraying or coating, and the surface of the plastic film 11 is subjected to a predetermined treatment described later, and then bonded with an adhesive 12 to form the spacer 10.

Highly slippery glass films suitable for spacers in electrostatic recording heads usually have low surface pressure energy and poor wettability with the adhesive 12, resulting in insufficient adhesive strength and poor sliding with the recording medium 1. Therefore, it is necessary to perform surface treatment to increase wettability with the adhesive 12.

As an example of surface treatment, polyester with a thickness of 4 μm is used as the plastic film 11, which is immersed in a 20% caustic soda solution at 82° C. for 5 minutes, washed with water, and then soaked in a dilute aqueous solution of stannous chloride (10 g /l) for 5 seconds, then washed with water and dried. The spacer 10 is formed by applying an epoxy adhesive as the adhesive 12 to the surface of the plastic film 11 that has undergone such surface treatment and bonding.

In the above configuration, when the main body of the head is completed, adhesive 1 is applied to the narrow surface of the control electrode 3 except for the surface of the needle electrode 2.
Apply the coated surface of No. 2 and paste the spacer 10. Since the spacer 10 was surface-treated, it was confirmed that the adhesive force was improved by about 18 times compared to the case where an untreated film was pasted with an adhesive. In addition, the spacer forming process (bonding process using adhesive) of the present invention is approximately the same as the process of pasting cellophane adhesive tape, which is one conventional process, and other conventional processes can be omitted. Efficiency is greatly improved. Conventionally, for example, it took about three hours to complete a spacer, but according to the present invention, by performing surface treatment on a large amount of polyester film once, the subsequent production time is reduced to several hours. It can be shortened to a sufficient length.

FIG. 4 shows the electrostatic recording head 10 of the present invention shown in FIG.
This is an example of a recording apparatus using an electrostatic recording head 100 according to the present invention to apply an electrostatic charge to a recording medium 1 formed on the surface of an endless belt. A recording belt 21 in which a recording body is formed by sequentially providing base mylar, a resistive layer, and a dielectric layer on the surface of the belt; an electrostatic recording head 100 that is provided so as to be able to come into contact with the surface of the recording belt 21; Row 222 that drives the body belt 21
a motor 23 that drives the roller 22; a developer 24 that applies toner to the surface of the recording belt 21 according to the surface charge; A transfer corotron 26 that adheres (that is, transfers) toner to the belt 25, a cleaner 27 that removes toner adhering to the surface of the belt 21 after the transfer is completed, and removes the charge on the recording medium (belt) 21 cleaned by the cleaner 27. an erase corotron 28 that fixes the print or image transferred to the recording paper 25; a drive that applies a recording voltage to the needle electrode 2 of the electrostatic recording head 100 and a negative voltage to the control electrode; It is composed of a circuit 30 and a control section 31 that controls the drive circuit 30 and the row 222.

In the above configuration, when a recording voltage is applied to the needle electrode 2 of the electrostatic recording head 100 by the drive circuit 30 in response to a recording signal from, for example, a facsimile, the motor 23 driven by the control unit 31 moves the dielectric belt 2 As the recording medium is rotated, an electrostatic latent image is formed on the recording medium. This latent image is developed with toner by a developing device 24 and transferred onto a recording paper 25 by a transfer corotron 26. The transferred toner image is fixed by a fixing device 29 to obtain a recorded image. On the other hand, after residual toner is removed from the recording belt 21 by a cleaner 27, the latent image is erased by an erase corotron 28.

(E) According to the electrostatic recording head of the present invention, the spacer material, which has low adhesiveness due to its high slipperiness, is bonded to the head surface after its adhesiveness is increased through surface treatment. This makes it possible to increase productivity and reduce costs.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional electrostatic recording head. Figure 2(a)
, (b) and (e) are explanatory diagrams of the assembly process of the electrostatic recording head of FIG. 1. FIG. 3 is a sectional view showing an embodiment of the present invention. FIG. 4 is a configuration diagram showing an example of a recording apparatus using the electrostatic recording head of the present invention. Explanation of symbols 2... Needle electrode, 3... Control electrode, lo...
・Spacer, l...plastic film,
12...Adhesive. Figure 1 Figure 2 (a) (b)
(C) Figure 3 Funeral diagram 4

Claims (1)

[Claims] A spacer that maintains a constant air gap on the discharge surface of the stylus, which is equipped with a multi-needle stylus that forms an electrostatic latent image on a recording medium row by row by applying a DC voltage according to recorded information. An electrostatic recording head comprising: an electrostatic recording head formed on a head surface, wherein the spacer is configured such that a surface-treated surface of the spacer is adhered to the head surface via an adhesive.