JPH0692159B2 - Electrode head - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing electrode head of a recording device for recording an electric signal in a visible image.

2. Description of the Related Art Among various recording apparatuses, a recording apparatus of a type such as an electric discharge recording apparatus, an electrolytic recording apparatus, and an electric recording apparatus that conducts electricity from an electrode needle is excellent in high speed, record storability, and economy. However, the print quality of these devices was not very good.

That is, the resolution was not so good, and 5 to 6 dots / mm was common.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above recording apparatus, for example, the electric discharge recording apparatus, the discharge phenomenon itself has a higher resolution, and the recording speed is also higher.
If it is possible to write for 1 second per A4 sheet, the low performance is due to the electrode head for writing. Since the tip of the electrode head (the portion that contacts the recording paper) becomes extremely hot, the electrode needle is projected. For this reason, a high density (high resolution) electrode head has a problem that it bends because a thin electrode needle is used. In order to deal with this problem, a method of thickening the electrode needles and staggering them has been adopted. 5-6 by this
Dots / mm were realized. It was considered impossible any more. In order to break through the limit, an embedded electrode head has been devised in which the electrode needle does not protrude. A high density groove is formed on a support mainly composed of a material having excellent heat resistance, lubricity, wear resistance, and workability such as hexagonal boron nitride, and it is used as an electrode needle.
An electrode head having a structure in which a conducting wire having a diameter of 30 μ is put in a groove and a lid is appeared. However, this method is extremely difficult to manufacture due to the precision processing and the use of fine wires. In addition, the gap between the recorded dots was wider than the dot diameter. In the case of discharge recording, lower the impedance of the electrical signal source and connect a capacitor between each electrode needle and the ground to make the dot diameter larger than the diameter of the electrode needle and I was filling a gap.

The problem associated with such a high-density electrode head is not only the discharge breakdown recording device, but also a common problem with other recording devices, for example, a recording device of a type in which electricity is supplied from an electrode needle such as an electrolytic recording device or an energization recording device. there were.

Means for Solving the Problems In order to solve the above problems, the present invention provides an electrically insulating first and second supporting bodies having a plurality of grooves on the surface as an electrode head, in which valleys and ridges of each groove are formed. The electrode needles are meshed with each other and the electrode needles are provided in the valleys of the first and second support-like grooves.

The present invention realizes an electrode head having the above-described structure, which is easy to manufacture with high resolution and therefore inexpensive and highly reliable, and which can provide an inexpensive recording apparatus by omitting a capacitor in an electric discharge recording apparatus.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a perspective view of an embodiment of the electrode head of the present invention. In FIG. 1, 101 is an electrically insulating first support, and 102 is an electrically insulating second support. Grooves arranged at a constant pitch are processed on the surfaces of the first and second electrically insulating supports. The first support and the second support are combined so that the ridges and valleys of the respective grooves mesh with each other, and the electrode needles 103 are provided in the valleys 104. As for the material of the support, in addition to electrical insulation, a material that is soft enough to not damage the surface of the recording paper as it travels in contact with the recording paper is preferable. For example, a hexagonal boron nitride sintered body or gypsum is preferable. Further, in the case of a composite with a resin or the like, it is preferable to use hexagonal boron nitride, calcium carbonate, talc or the like as a filler.

The electrode needle 103 is a commonly used conductor wire having a circular or rectangular cross section.

Copper wire is the easiest to handle. Among them, a coated copper wire (often called an enameled wire) is preferable in order to prevent a short circuit with an adjacent electrode needle body when arranging the electrode needles at a high density. Tungsten wire, nickel wire, or stainless wire may also be used. However, nickel wires are expensive, and other wires are difficult to connect to an electric circuit, and there are problems to be overcome in making the electrode head. Reference numeral 105 is a part of the electrode needle which is taken out from one side of the support for connecting with an electric circuit and serves as a lead portion. First support 101 and second support 1
It is easy to fix the 02 and the electrode needle 103 with resin. This resin preferably fills the entire space formed by the first support, the second support and the electrode needle. Otherwise, for example, in the case of FIG. 1, the mechanical strength becomes weaker when only the portion that is not relevant to the lower recording is attached.

The first support and the second support may be exactly the same. However, the width of the crests and valleys of the groove is limited. The width of the peaks must be narrower than the width of the valleys. Otherwise, the crests and troughs of the groove cannot be engaged. The electrode needle 103 may be inserted after the first support member and the second support member are engaged with each other, or an electrode needle may be provided on each of the first and second support members before the engagement. And then bite together.

It suffices that the depth of the groove (= the depth of the valley = the height of the peak) be deeper than the electrode needle to be provided, but it is easiest to prepare 2 dots as the delay time given to the electric signal (relationship of memory etc.). Therefore, it is preferable that the diameter is about twice the diameter of the electrode needle.
Depending on the recording apparatus, the electrode head may be tilted with respect to the surface of the recording paper in order to improve the running property. In such a case, the depth of the groove may be reduced in order to make the interval between the first and second rows of the staggered pattern the same as the dot interval.

That is, the depth of the groove is deeper than the dimension of the diameter of the electrode needle and shallower than double.

Example 1 Plate-shaped (length 20 mm x width 20 mm x) as the first and second supports
A hexagonal boron nitride sintered body having a thickness of 2 mm was prepared. The width of this surface is cut by a dicing saw for semiconductor wafer processing.
65μ depth 125μ pitch 125μ (8 / mm) groove was cut from end to end. This hexagonal boron nitride has a diameter of 60
Wrap the coated copper wire of μ 64 times with a winding machine, apply commercially available room temperature curing epoxy resin (Ciba Araldite) from above, and after meshing the ridges and valleys of each other groove under a microscope, It was tightened with a vise used for machining and left at room temperature to cure the resin. The tip of the coated copper wire was polished so as to come into contact with the recording paper, and each of the leads of the coated copper wire on the opposite side was connected to a signal generating circuit. Then, this is pressed against the discharge recording paper and run at 3 cm / sec, the recording paper is grounded, and the electric signals given to the first and second rows of the zigzag are given a proper delay time, and the drive circuit of FIG. When an electric signal is applied by
Fine print with no gap between 16 dots / mm recording dots was obtained. FIG. 2 shows only the output part of one of the 128 drive circuits. 201 is an NPN transistor,
202 is a protective resistance, and 100 ohm was used in this experiment. The emitter of the transistor 201 is connected to the negative power supply (-45V),
A print signal was put in the base. The other end A of the resistor 202 is the first
It was connected to one of the lead portions of the electrode needle in the figure.

Comparative Example 1 In Example 1, the grooves on the first support were formed at 65 μ pitch and 30 μ pitch.
An electrode head having a width of 30 μm and a coated wire of 25 μm was inserted into the electrode, and the resin head was covered with a plate of a hexagonal boron nitride sintered body having no groove formed on the resin to fix the electrode head. A similar experiment was performed using the same drive circuit as in Example 1, and 16 dots / mm of dots were obtained, but the dot diameter was small and gaps were formed between the dots, apparently reducing the density of printing. It was To fill the gap between the dots, a capacitor of at least 0.0046 μF (optimum 0.01 μF) was needed between point A in FIG. 2 and the ground.

In Example 1, a coated copper wire was used as the wire, but it is obvious that a bare copper wire or another conductive wire may be used. However, in that case, measures are taken so that the wires arranged in parallel do not come into contact with each other. It is obvious that the wire may have any cross section, but a circular shape is common and the price is low. In the first embodiment, the winding method is adopted as the manufacturing method of the electrode head to describe the present invention, but there is no need to stick to this.

Example 2 In Example 1, after the epoxy resin was not applied to the entire meshing portion, after winding, the winding resin was first combined and fixed with a vise, and then an acrylic instant adhesive (trademark Aron Alpha) was used for the first support and the second support. It was fixed by pouring it into the space made up of the body and the electric conductor. Example 1 using this electrode head
When the same experiment was performed, the almost same result was obtained.

Example 3 The resin was assembled in the same manner as in Example 1 except that the resin was not applied to the entire meshing portion and only the portion near the lead portion was formed. When the same experiment as in Example 1 was conducted using this electrode head, almost the same result was obtained.

Example 4 90% by weight of hexagonal boron nitride powder and an epoxy resin (bisphenol A type resin) were mixed and cured to form a plate-like first (length 20 mm × width 20 mm × thickness 2 mm) first, and A second support was prepared.

The first support and the second support were subjected to the same groove processing as in Example 1 and assembled in the same manner. When the same experiment as in Example 1 was conducted, the result was not as good as in Example 1, but
The print quality was not so bad that the dots were slightly trailing.

Comparative Example 2 Prepare a plate-shaped (length 20 mm x width 20 mm x thickness 2 mm) support made of a composite obtained by mixing and curing 90% by weight of hexagonal boron nitride powder and an epoxy resin (bisphenol A type resin). did. Grooving and assembly were the same as in Comparative Example 1, that is,
A 16-dot / mm single-row array electrode head was made. The lid was also the same composite as the support. When an experiment similar to that of Example 1 was conducted using this electrode head, the same result as that of Comparative Example 1 was obtained, and a capacitor was required in the signal generating circuit to fill the gaps between the dots.

Example 5 80% by weight of talc powder and an epoxy resin (bisphenol A
A plate-shaped (length 20 mm × width 20 mm × thickness 2 mm) first and second supports made of a composite obtained by mixing and curing type resin) were prepared. As a result of performing the same experiment as in Example 1, the printing quality was slightly inferior to that in Example 1, but there was no electrical short circuit between adjacent electrode needles and no disturbance in the dot row. Was good enough.

Comparative Example 3 80% by weight of talc powder and an epoxy resin (bisphenol A
A plate-shaped (length 20 mm × width 20 mm × thickness 2 mm) support made of a composite obtained by mixing and curing type resin was prepared.
Grooving and assembly were the same as in Comparative Example 1, ie 16 dots / m
An array of m electrode heads was made. The lid was also the same composite as the support. Example 1 using this electrode head
When a similar experiment was conducted, short-circuits frequently occurred between adjacent electrode needles, and the dots that should be lined up were disordered, making it impossible to print characters. In particular, short circuits often occurred in places with many recording dots.

EFFECTS OF THE INVENTION As is clear from the above description, in order to solve the above-mentioned problems, the present invention has a structure in which the first and second electrically insulating support bodies each having a plurality of grooves on the surface are provided. The troughs of the grooves mesh with each other, and the electrode needles are provided in the troughs of the first and second support-like grooves. This makes it possible to manufacture an electrode head with high resolution at low cost, obtain high reliability, and use it in various recording apparatuses using an electrode head in which electrode needles are arranged in high density.
When used in an electric discharge recording device, a capacitor is omitted and an inexpensive recording device is provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electrode head of the present invention, and FIG. 2 is a circuit diagram showing an output portion of a signal circuit used in an experiment. 101 ... Electrically insulating first support, 102 ... Electrically insulating second support, 103 ... Electrode needle, 104 ... Valley, 105 ...
Lead, 201 ... Transistor, 202 ... Protection resistor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazushi Ono 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Tetsuhiro Sano, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 56) References JP-A-59-124859 (JP, A)

Claims (9)

[Claims] 1. An electrode head used in a recording apparatus for recording an image by contacting and energizing a recording paper with an electrode needle, the first and second electrically insulating surfaces having a plurality of grooves. An electrode head, characterized in that the troughs of the respective grooves mesh with each other on the support, and the electrode needles are provided in the troughs of the grooves of the first and second supports. 2. The electrode head according to claim 1, wherein a space formed by the first support, the second support and the electrode needle is filled with a resin. 3. The electrode head according to claim 1, wherein the first support, the second support and the electrode needle are partially fixed by resin. 4. The electrode head according to claim 1, wherein the first support and the second support have the same shape. 5. The depth of the first support and the second support-like groove is deeper than the dimension of the diameter of the electrode needle and shallower than double the depth of the electrode needle. Electrode head. 6. The electrode head according to claim 1, wherein the first support and the second support are made of a sintered body of hexagonal boron nitride. 7. The first support and the second support are composites composed of hexagonal boron nitride powder and a thermosetting resin, as set forth in claim 1. Electrode head. 8. The electrode head according to claim 1, wherein the electrode needle is a covered conductive wire. 9. The electrode head according to claim 8, wherein the electrode needle is a coated copper wire.