JPS61195858A - Printer head of printer - Google Patents

Abstract

PURPOSE:To improve printing speed and the durability of bimorph piezoelectric elements by providing a plastic electrode on the external surfaces of two piezoelectric films sandwiching an intermediate electrode and inputting a printing voltage signal between the plastic electrode and the intermediate electrode. CONSTITUTION:A printer head 5 is composed of an intermediate electrode 13 and plastic electrodes 14, 15 sandwiching piezoelectric films as bimorph piezoelectric element. Voltage is applied among the electrodes 13, 14 and 15 to distort the crystal of piezoelectric elements so that the whole crystal is flexible in a printing direction. In this case, if a voltage to be applied is selected for any high frequency, it is possible to easily increase the printing speed of the printer head 5. In addition, the plastic electrode is made of plastic containing dispersed powdered piezoelectric material. Therefore, said electrode has a buffer action so that a uniform voltage can be applied to piezoelectric film to damp an impact, and also has an effect to prevent damage caused by contact with any other article.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer head of a printer device used as an output device of a computer.

[Conventional technology]

In general, a printer device outputs various data stored in the memory of a computer by printing it on a sheet of paper as characters and symbols that can be read by an operator.

By the way, such printer devices are not widely used to this day.
Most of the things that have come are of the dot impact type. This printer device combines a large number of wires or needles and selectively strikes some of these wires that correspond to patterns of characters or figures onto a sheet of paper via a ribbon, etc. 1. Prints characters or needles on the sheet of paper. numbers,
It is designed to display graphic patterns, etc. In addition,
In this case, as the wires and needles are made thinner and the number of wires in combination is increased, it becomes possible to draw the above-mentioned figures with high density without color skipping.

[Problem that the invention seeks to solve]

However, in the conventional dot printer device described above, each wire is sucked one by one by an electromagnetic lenoid, so the transient response of the lenoid is poor, and in particular, the mechanical frictional resistance is extremely high. It is impossible to increase the printing speed using these wires beyond a certain level, and this poses the inconvenience of not being able to match the calculation speed of a computer.

The present invention has been made in view of the problems of the prior art, and has a printer head mainly composed of a bimorph piezoelectric element to significantly improve printing speed and improve the durability of the bimorph piezoelectric element. The purpose of the present invention is to provide a printer head for a printer device that uses the following methods.

[Means for solving problems]

The printer head of the printer device according to the present invention consists of a grifter head main body as a flexible part and a head tip portion integrally provided at the tip of the printer head main body, and the printer head main body is located between two piezoelectric elements. Electrodes are sandwiched between the piezoelectric elements, and a glass electrode is provided on the outer surface of each of these piezoelectric elements, so that a printing signal voltage can be applied between the intermediate electrode and the glass electrode.

[Effect]

Since the intermediate electrode in this invention is made of carbon fiber, it is conductive, lightweight, and highly flexible, making it an effective material for a printer head that moves with a small force due to piezoelectric action. Suitable for taking out the maximum amount. In addition, since the plastic electrode is made by mixing and dispersing piezoelectric material powder into a glass material, it is possible to apply voltage to the piezoelectric film, and its buffering effect softens the impact on the piezoelectric film. It acts to prevent damage from contact with other items.

[Embodiments of the invention]

FIG. 1 is a sectional view showing details of the printer head 6 of the present invention. This printer head 6 employs a bimorph piezoelectric element structure. That is, the printer head main body is constructed by sandwiching an intermediate electrode 13 made of a force-bonded fiber with a thickness of about 20 μm between two piezoelectric films 11 and 12, and each piezoelectric film 1
Plastic electrodes 14 and 15 as external electrodes are provided on the outer surface of 1.12. Further, a head tip 6 is integrally attached to the tip of the printer head main body, and the head tip e has many pores 16 for ink pads penetrating from the printing surface to the other surface opposite thereto.

There are several. Therefore, the ink soaked into the ink pad from the other surface can be received and the ink can be led to the printing surface side. Further, this head tip portion 6 is molded as a porous synthetic resin block.

The printer head 6 also includes piezoelectric films 11 and 12.
It is configured as a bimorph piezoelectric element sandwiched between an intermediate electrode 13 and plastic electrodes 14 and 15, and by applying a voltage between the electrodes 13 and 14, 15, distortion is caused in the crystal of the piezoelectric element. , printer head 6
The whole can be bent in the printing direction. In this case, by selecting the frequency of the applied voltage to be an arbitrarily high frequency, it is possible to easily increase the printing speed of the printer head 6 in accordance with the calculation speed of the computer. In addition, since the intermediate electrode 13 is made of carbon fiber, it has excellent conductivity and
Since it is lightweight and highly flexible, it is extremely suitable as an electrode material for the printer head 6, which moves with a minute force due to piezoelectric action, and the piezoelectric film 11.1
The maximum amount of momentum can be extracted. On the other hand, since the plastic electrodes 14 and 15 are made by mixing and dispersing powder such as a piezoelectric material in a flexible plastic material, they can uniformly apply voltage to each part of the piezoelectric film, and the piezoelectric film 1; In addition to alleviating various impacts on the 12 VC, the piezoelectric films 11 and 12 are not easily damaged or deformed even if other articles or parts come into contact with them.

FIG. 2 is a plan view showing the mounting structure of the printer head 6 on the printed circuit board 17. As shown in FIG.

This printed circuit board 17 is provided with through holes 18 in a number approximately corresponding to the number of printer heads 6. Also,
A pair of conductive patterns 19 are provided on the upper and lower surfaces of the 17 printed circuit boards, corresponding to each of the printer heads 5, and these pairs of conductive patterns 19 are connected through the through holes 18. Further, one end of each of these conductive patterns 19 extends to near one end of the printed circuit board 17. The ends of the plastic electrodes 14 and 15 of each of the printer heads 6 are electrically and mechanically connected to the ends of the conductive pattern 19 on the printed circuit board 17, and the ends of each intermediate electrode 13 of the printer head 5 are
It is electrically and mechanically connected to a grounding printed pattern 20 provided on the end surface of the printed circuit board 17.

FIG. 3 is a sectional view of a printer device using the printer head 6. In the figure, reference numeral 1 denotes a block of a printer device having a recess 2 as a printing section on a part of its outer surface, and a guide roller 4 for guiding an ink pad 3 is provided within this block 1. This guide roller 4 is configured to send out an appropriate amount of a long plate-shaped or sheet-shaped ink pad 3 toward the recess 2vc. It is designed to maintain a certain distance from the side surface (ink receiving surface). In other words, the amount of wear caused by the impact of the head tip 6 with the above-mentioned side surface is compensated for by the rotation of the roller 4. The amount of wear can be compensated for by electronically monitoring the distance between the head tip 6 and the printing surface so that the distance is always kept constant.

``In this embodiment, porous plastic can be used as the ink pad 3 through which ink passes, but a damper material made of a gel material or the like that has an excellent effect of absorbing vibration energy and impact energy is used. The damper material absorbs the impact of the head tip of the printer head while providing soft cushioning.

It has the property of suppressing the occurrence of irregular vibrations after it has stopped, and preventing the tip of the head from repelling in the direction of impact input or in other directions, and is resistant to cold, moisture, and heat. and those with excellent electrical characteristics are used.

Since this damper material is used as an ink pad, it may have a porous structure capable of supplying ink, or may include a fiber member in a portion thereof. A head tip 6 of the printer head 6 faces the tip surface of the ink pad 6. Note that a large number of the printer heads 6 are installed in the block 1 in a curved manner, and the head tip 6
When one side of the ink receiving side collides with the tip of the ink pad 3, the receiver picks up the ink that has soaked into the ink pad a and supplies the ink to the printing surface on the opposite side. It has a porous structure like this.

On the other hand, a pair of large and small paper feed rollers 8 are arranged so as to be in contact with each other on the opposing surface side of the block 1, and while rotating in the direction of the arrow in the figure, the paper 9 sandwiched between them is moved in the direction of the arrow P. It is being sent to When this paper 9 is sent out, it is guided so as to maintain a certain distance from the printing surface side of the head tip 6. 101''j In order to maintain this constant distance, a paper presser piece attached to the block 1 side is made of a metal plate or synthetic resin plate formed into a curved shape, and if necessary, this can be attached to the head tip 6. It can be configured as a distance sensor between the print surface and the paper 9. In Figure @3, the distance between the head tip 6 and the tip of the ink pad 3 and the distance between the head tip 6 and the paper 9 are, for example, It is maintained at around 0.1 W.

Next, the operation will be explained. Now, when the printer device is activated and a printing operation is started, one of the many printer heads 5 is deformed by receiving the signal voltage, and the printing surface of the head tip 6 is struck against the paper 9, and
Immediately after the operation, drive q-ruff and 8 and press paper 9.
are sent out one after another, and characters and figures are printed on the paper 9. In other words, the printing operation and paper feeding continue synchronously. This printing speed can be arbitrarily set by selecting the frequency of the voltage applied between the intermediate electrode 13 and the outer electrodes 14,15.

On the other hand, the head tip 6 also impacts the ink pad 3 at high speed while receiving and taking ink as described above.

Note that, as described above, this ink pad 3 is made of a damper material that alleviates vibrations and shocks, so there is no possibility that a large repulsive force will be applied to the tip part 6 of the friend head when it collides with it. The repulsive force can prevent the same head tip 6 from unnecessarily hitting the paper again. Therefore, it is possible to further reduce the gap between the head tip 6 and the paper 9, thereby making it possible to further reduce the amount of movement of the head tip and increase printing speed.

In this case, since the intermediate electrode 13 is made of lightweight and highly flexible carbon fiber, it does not interfere with the operation of the entire printer head 6, and the outer electrode is made of plastic electrode 14.
．． 15, it plays the role of protecting the piezoelectric films 11 and 12, and provides a buffering effect during printing operations. In addition, these intermediate electrodes 13 and plastic electrodes 14
, 151'j can be integrally molded together with the piezoelectric films 11 and 12, and is suitable for mass productivity of printer heads. In this case, the head tip 6 can also be molded integrally with these.

[Effects of the Invention] As explained in detail above, according to the present invention, the printer head main body has an intermediate electrode sandwiched between two piezoelectric films, a glass electrode provided on the outer surface of each piezoelectric film, and The printer head is configured so that a printing voltage signal can be input between this plastic electrode and the intermediate electrode, and as a result, the printer head as a whole is lightweight and can secure sufficient momentum, while also being able to resist external impacts and its own impact motion. This can prevent the piezoelectric film from being damaged or receiving other mechanical damage. Also,
Since integral molding using a mold becomes possible, effects such as lower manufacturing costs and higher mass productivity can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the printer head of the present invention, FIG. 2 is a plan view showing the mounting structure of the printer head on a printed circuit board, and FIG. 3 is a sectional view of the main parts of the printer device. 11.12... Piezoelectric film, 13... Intermediate electrode,
14.15...Plastic electrode.

Claims (2)

[Claims] (1) In a printer head of a printer device that is used as an output device of a computer and is equipped with a flexible printer head body and a printing head tip portion connected to the tip of the printer head body, the printer head The main body has an intermediate electrode sandwiched between two piezoelectric films, and a plastic electrode is provided on the outer surface of each piezoelectric film, and a printing voltage signal can be input between the plastic electrode and the intermediate electrode. A printer head of a printer device characterized by: (2) The printer head of the printer device according to claim 1, wherein the intermediate electrode is made of carbon fiber.