JPH0630905B2 - Electrostatic multi-needle recording head - Google Patents

Description

The present invention relates to an electrostatic multi-needle recording head used in a recording section of an information recording device such as a facsimile.

(Structure of Conventional Example and Problems Thereof) First, a general structure of this kind of electrostatic multi-needle recording head will be described. The electrostatic multi-needle recording head of the multi-stylus solid-state scanning system has a circuit configuration shown in FIG. 8. A large number of recording electrodes 10 are grouped and matrix-connected, and a control electrode corresponding to a predetermined number of recording electrodes 10. It has a configuration of 11. The control electrode group A is connected to the M-bit shift register, and the two recording electrode groups B and C are also connected to the m-bit shift register, respectively, and the electrodes 10 selected by the driver circuit including these shift registers, The electrostatic latent image recording is sequentially performed in the 11th period.

The recording electrode group 10 includes, for example, 2048 recording electrode wires 12 of 0.12.
It is composed by regularly and fixedly arranging in parallel at a pitch of 5 mm. And the diameter of the recording electrode wire 12 is
0.1mm ultrafine coated copper wire is used. As a method of aligning the recording electrode wires 12 and a matrix wiring method, a method of winding the recording electrode wires 12 around a drum 13 shown in Japanese Patent Publication No. 54-4263 is implemented. In this method, as shown in FIG. 9, the recording electrode wire 12 is wound a predetermined number of times around a drum 13 having a spiral guide groove (not shown) of 0.125 mm pitch on the outer periphery, and then the recording electrode wire 12 is cut into a notch groove 14. Near each other using a quick-drying synthetic resin adhesive, and then the recording electrode wire 12 is cut along the notch groove 14, and the horizontal wire 15 is drumed.
The recording electrode wires 12 for each horizontal wire 15 are bundled into a plurality of groups by being removed from the horizontal wire member 15, and the bundled recording electrode wires 12 are connected to the terminals 17 of the printed circuit board 16 for each group to connect the recording electrode wires. Twelve alignments and matrix wiring are performed.

As an improvement of the above conventional example, Japanese Patent Publication No.
Although there is one using a wire rod arranging base as shown in Japanese Patent Publication, the point is to align the ultra-fine coated copper wires in the guide grooves formed on the wire rod arranging plate at a pitch of 0.125 mm and perform the same matrix wiring as above. Then there is no fundamental difference.

Then, as shown in FIG. 10, the recording electrode wire groups 12, 12, ... Are fixed between the substrate 18 and the lid plate 19 made of a glass epoxy resin plate by using an adhesive, and recording is performed. The electrode unit R is constructed. Next, as shown in FIG. 11, a plurality of (for example, 65) control electrodes 11 are arranged on both outer surfaces of the recording electrode unit R, and a synthetic resin outer package is formed using a molding jig.
When the recording electrode unit R and the control electrode 11 are embedded and fixed in the exterior body 50 at the same time as forming the 50, the basic structure of the electrostatic multi-needle recording head is obtained.

By the way, the above conventional example has the following problems.

The exterior body 50 is made of synthetic resin, the substrate 18 and the cover plate 19 of the recording electrode unit R are made of glass epoxy resin, and a binder 51 for connecting the recording electrode wire 12 of the recording electrode unit R (see FIG. 10). (See) is a synthetic resin adhesive,
Wear resistance is inferior and improvement of durability is desired.

Since it has the above structure, improvement in arc resistance is desired.

Since the exterior body 50, the substrate 18, the lid plate 19 and the binder 51 are made of synthetic resin having a relatively large thermal expansion coefficient,
There is a problem in that the straight movement accuracy and the pitch accuracy of the electrodes are easily changed due to the heat change.

(Object of the Invention) It is an object of the present invention to provide an electrostatic multi-needle recording head that solves the problems of the above-mentioned conventional example.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention arranges a large number of recording electrode wires at a predetermined interval between a ceramic substrate and a ceramic lid plate, and at the same time, the substrate and the lid plate are separated from each other. A plurality of control electrodes are arranged on both outer surfaces of a recording electrode unit which is bonded by a low melting point glass and is filled with the space by the low melting point glass, and the control electrode and the recording electrode unit are placed in a low melting point glass outer casing. It is characterized in that the electrostatic multi-needle recording head is fixed.

(Examples) The present invention will be specifically described below based on Examples shown in FIGS. 1 to 7.

First, the recording electrode unit R will be described. On the surface of the ceramics substrate 20 composed of an alumina-based ceramics plate, a metal film 21 having a thickness h of 40 μm of copper or copper alloy is plated,
The coating is formed by a method such as vacuum deposition. Next, as shown in FIG. 2, a plurality of slits 23 are formed by irradiating the metal film 21 with a laser beam 22 to form a plurality of recording electrode lines 12 on the substrate 20 in an insulating relationship with each other. Form. These slits 23 are deeply formed to reach the surface of the substrate 20, and their width w is set to 10 μm. Also, these slits 23 have a pitch p of 60 μm,
It is formed so as to be parallel to each other. Each recording electrode wire 12 formed by being separated by the slit 23 has a rectangular cross section having a height of 40 μm and a width of 50 μm. It has been confirmed by experiments that a neodymium yag laser is used as a laser device and when the second harmonic (wavelength 0.532 μm) is irradiated, slit processing of the metal film 21 formed of copper or a copper alloy can be efficiently performed. It is As described above, as shown in FIG. 3, a substrate 20 is formed in which a large number of recording electrode wires 12 are formed with harmonics having a pitch of 60 μm. Incidentally, the metal film 21 can also be composed of a metal other than copper and copper alloys, particularly a hard metal having good wear resistance, a recording electrode having excellent durability when the metal film 21 is composed of an amorphous alloy or the like. Unit R is obtained.
Moreover, the slit processing in this case is performed by the laser beam 22.
It is easy because it is performed by irradiation.

On the other hand, as shown in FIG. 3, a low melting point glass film 25 is formed on the surface of the ceramic lid plate 24 made of an alumina ceramic plate by fusion bonding. It is preferable that the low melting point glass film 25 has a melting point of about 450 ° C.

Next, as shown in FIG. 4, the substrate 20 and the cover plate 24 are overlapped in a state of facing each other, and heat is applied to the low-melting-point glass film 25 to heat-bond the substrate 20 to the substrate 20. Lid plate
Combined with 24. At this time, the low melting glass 25a fills the slit 23. Therefore, each recording electrode wire 12 is reliably insulated from the other by filling the insulating binder (low melting point glass) 25a in the space between the adjacent recording electrode wires 12.

As described above, the recording electrode unit R in which the recording electrode wire 12 of high density is arranged is obtained, and the recording electrode 10 is formed at the tip of the recording electrode wire 12 (see FIGS. 3 and 5). ).

The matrix wiring of the recording electrode unit R is, as shown in FIG. 5, each recording electrode wire 12 and wiring on the printed circuit board.
This is carried out by connecting 26 to the flexible printed board 27.

Next, a structure for obtaining the electrostatic multi-needle recording head by fixing the recording electrode unit R and the control electrode 11 in the low melting point glass outer casing 28 will be described. The control electrode 11 is made of a wear resistant metal such as cemented carbide or amorphous alloy, and has a height of 5
It has a rectangular cross section with a width of 8 mm and a width of 8 mm.

The plurality of recording electrode units R are arranged in series, and a predetermined number (for example, 65 × 2) of control electrodes 11 are arranged on both outer surfaces of the recording electrode units R, which are fixed by a molding jig (not shown). By molding low melting glass,
An electrostatic multi-needle recording head as shown in FIGS. 6 and 1 is obtained. The low melting point glass preferably has a melting point of around 450 ° C. like the one used for the low melting point glass film 25, and this becomes the low melting point glass exterior body 28 after molding. It goes without saying that the control electrode 11 and the recording electrode unit R are fixed inside the outer package 28.

The electrostatic multi-needle recording head formed as described above, as shown in FIG. 7, is assembled to the case main body 29 in which the printed circuit board is incorporated and the upper and lower cover plates 30 and 30. Around this, the recording surface of the recording head portion is polished to be a smooth surface, and a predetermined wiring is provided between the recording electrode unit R and the control electrode 11 and the printed circuit board.

The present invention can be configured in various modes other than those shown in the above embodiments. For example, in the above embodiment, the recording electrode wire 12 is formed by dividing the metal film 21 formed by coating the surface of the ceramic substrate 20 with the laser beam 22, but the invention is not limited to this, and for example, a copper wire is used. May be configured.
Although the control electrode 11 is made of a wear resistant metal in the above embodiment, it may be made of another metal such as copper or a copper alloy.

(Effects of the Invention) As a result of having the above-mentioned configuration, the present invention can exert the following effects.

The exterior body is made of low-melting glass, the substrate and cover plate of the recording electrode unit are made of ceramics, and these binders are made of low-melting glass. These materials have excellent wear resistance. It is possible to dramatically increase wear resistance and improve durability.

Since the low melting point glass having excellent electric insulation is filled between the recording electrode lines, between the control electrodes, and between the recording electrode lines and the control electrodes, the arc resistance can be improved.

Since the exterior body and the binder are made of low-melting-point glass having a relatively small coefficient of thermal expansion, and the substrate and the lid plate are also made of ceramics having a relatively small coefficient of thermal expansion, the accuracy of rectilinear movement of the electrode with respect to thermal change is high. Also, the pitch accuracy can be improved as compared with the conventional example.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention, FIG. 1 is a perspective view of an essential part thereof, FIG. 2 is a longitudinal sectional view showing a method of manufacturing a recording electrode unit, and FIG. 3 is a recording electrode unit. FIG. 4 is a vertical cross-sectional view showing a main part of the recording electrode unit, FIG. 5 is a plan view showing matrix wiring, and FIG. 6 is a schematic view showing an electrostatic multi-needle recording head. FIG. 7 is a perspective view of an electrostatic multi-needle recording head, and FIG.
FIG. 9 is a circuit diagram of an electrostatic multi-needle recording head, FIG. 9 is a perspective view showing a manufacturing method of a conventional recording electrode unit, FIG. 10 is a vertical sectional view showing a conventional recording electrode unit, and FIG. FIG. 3 is a vertical cross-sectional view showing a main part of an electrostatic multi-needle recording head. 10 …… Recording electrode 11 …… Control electrode 12 …… Recording electrode wire 20 …… Ceramics substrate 21 …… Metal film 22 …… Laser beam 24 …… Ceramics lid plate 25a …… Low melting point glass 28 …… Low melting point glass exterior Body R ... Recording electrode unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunio Nakata 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-52-92396 (JP, A)

Claims (3)

[Claims] 1. A plurality of recording electrode wires are arranged at a predetermined interval between a ceramics substrate and a ceramics lid plate, and the substrate and the lid plate are joined by a low melting point glass, and A plurality of control electrodes are provided on both outer surfaces of a recording electrode unit formed by filling the gap with a melting point glass, and the control electrode and the recording electrode unit are fixed in a low melting point glass outer casing. Needle recording head. 2. The electrostatic multi-needle recording head according to claim 1, wherein the control electrode is made of wear-resistant metal. 3. An electrostatic multi-needle recording head according to claim 1 or 2, wherein a metal film formed by coating recording electrode wires on the surface of a ceramic substrate is divided and formed by a laser beam.