JPH0541881Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention uses a plurality of printing elements that print dots by enlarging and transmitting dimensional distortion generated by the electrostrictive longitudinal effect of an impact printing head, especially a ceramic element, to a printing wire. Regarding individually assembled impact printing heads.

[Conventional technology]

Conventionally, this type of impact printing head
For example, there is a printing head described in Japanese Patent Application No. 58-139039. This printing head has a structure in which a plurality of printing elements using ceramic elements as actuators are stacked and assembled. A plurality of leads are connected to the ceramic element of each printing element to provide drive signals.

[Problem that the invention attempts to solve]

In the conventional impact printing head described above, when wiring the multiple leads connected to the ceramic elements of each printing element to each drive circuit, the number of wires is large, so the number of man-hours required for the wiring work is large. As the wiring becomes more congested, problems such as short circuits between leads are likely to occur.
There is a problem. This problem is particularly noticeable when the number of wires is large, that is, when the number of printing elements is large.

SUMMARY OF THE INVENTION An object of the present invention is to provide an impact print head that reduces the number of leads compared to the conventional one, improves wiring workability, and prevents problems from occurring, in order to solve the above problems.

[Means for solving problems]

In the impact printing head of the present invention, a piezoelectric element that generates dimensional distortion due to electrostrictive longitudinal effect in response to a drive signal is attached to a base member and a lever mechanism connected to the base member with both end surfaces connected. In an impact printing head having a structure in which a plurality of elements are stacked and attached, the base member and the lever mechanism are made of a metal material, the drive signal path is connected to at least one of them, and each of the piezoelectric The element consists of a plurality of internal electrode plates arranged parallel to both end faces at intervals within a columnar piezoelectric material, and one internal electrode plate on each of the internal electrode plates.
A first electrode is connected to the piezoelectric material and provided on one side of the piezoelectric material, and a second electrode is connected to the remaining internal electrode plate and connected from the other side of the piezoelectric material to at least one of both end surfaces. and a lead is connected to the first electrode of each piezoelectric element to guide the drive signal to the path.

〔Example〕

Next, the present invention will be described with reference to the drawings.

Figures 1a and 1b are a top view and a side view, respectively, of an embodiment of the present invention. This embodiment has a structure in which flat printing elements 1A and 1B are divided into two sets and mounted on a head stand 2 in a stacked manner, as in the case of a conventional printing head. While a plurality of leads are connected to each conventional printing element, in the printing elements 1A and 1B of this embodiment, one lead 11 is connected to each actuator, which is a piezoelectric element 10 made of ceramic material. I'm just doing it. Each of the printing elements 1A and 1B connects one end of the piezoelectric element 10 to the inner bottom of a U-shaped metal base member, and connects the top of the base member and the other end of the piezoelectric element 10 to the dimensional distortion occurring in the piezoelectric element 10. It has a structure connected to a metal lever mechanism to magnify and transmit the information. The application of the drive signal to each piezoelectric element 10 is as follows:
As will be described later, this is done between one lead 11 connected at the center and the connection points of the base member and lever mechanism at both ends.

The printing elements 1A and 1B are mounted on the head stand 2.
Spacers 4 and 5 are placed on top of each other, stacked one on top of the other, and are attached so as to form a fan shape when viewed from the side. The printing wires 13 attached to the tips of the lever mechanisms of the printing elements 1A and 1B pass through guide holes of wire guides 20 and 21 provided in the head stand 2, and the tips are guided to the printing position. On the sides of the stacked printing elements 1A and 1B, wiring boards 3A and 3B provided with printing wiring for connection to a drive circuit are installed vertically. Printing element 1A
Each lead 11 drawn out along the flat surface of 1B and 1B is connected to wiring boards 3A and 3B,
After being led to the end of the head by wiring formed on wiring boards 3A and 3B, it is connected to a drive circuit. Further, the base members of each printing element 1A and 1B are connected to each other by a lead 12, which is also connected to a drive circuit.

FIG. 2 is a perspective view showing an example of the configuration of the piezoelectric element 10 in this embodiment. Each of two ceramic elements having a laminated structure provided with a plurality of internal electrodes 7 has an electrode 8 formed thereon extending from one end surface to one side surface,
An electrode 9 is formed extending from the opposite end surface to the side surface. Internal electrodes 7 are connected to electrodes 8 and 9 alternately. These two ceramic elements are fixed with a metal electrode 6 interposed between one end face of each. As shown in FIG. 1, the piezoelectric element 10 made by connecting two ceramic elements is connected and fixed at both ends to the base member and lever mechanism of the printing elements 1A and 1B, and the piezoelectric element 10 is fixed to the electrode 6. Connect the lead 11.

When the drive signal is applied, the wiring board 3A is sent from the drive circuit.
The drive voltage applied between lead 11 and lead 12 led through 3B and 3B connects electrode 7, base member (or lever mechanism) and electrode 9 via electrodes 6 and 8. A dimensional strain is generated in the piezoelectric element 10 in the direction shown by arrow A due to the electrostrictive longitudinal effect of the ceramic element.

In the piezoelectric element 10 shown in FIG. 2, the electrode 6 is connected between two ceramic elements, and the electrode 6 is
This prevents the lead connection points from being damaged by mechanical vibrations generated in the ceramic element when the leads are directly connected to electrodes on the side surfaces of the ceramic element. If the operating conditions are such that there is no risk of such damage occurring, the electrode 6 can be omitted; for example, with one ceramic element, an electrode for connecting the lead 11 is formed on one side, and an electrode for connecting the lead 11 is formed on the opposite side. It is sufficient to use one in which an electrode for connection to the base member (or lever mechanism) is formed over one end surface.

In this embodiment, only one lead is drawn out from each printing element, and a printed wiring board is provided near the side of the stacked printing elements to which each lead is connected. The number of wires can be reduced, and as a result, wiring workability can be improved and defects can be prevented.

[Effect of idea]

As explained above, the present invention has the effect that it is possible to realize an impact printing head that reduces the number of leads compared to the prior art, improves wiring workability, and prevents the occurrence of defects.

[Brief explanation of the drawing]

1A and 1B are a top view and a side view showing an embodiment of the present invention, respectively, and FIG. 2 is a perspective view showing an embodiment of the present invention. 1A, 1B... Printing element, 10... Piezoelectric element, 6, 7, 9... Electrode, 7... Internal electrode, 2
... Head stand, 20, 21 ... Wire guide,
4, 5... Spacer, 11, 12... Lead, 1
3... Wire, 3A, 3B... Wiring board.

Claims (1)

[Claims for Utility Model Registration] Printing in which a piezoelectric element that generates dimensional distortion due to electrostrictive longitudinal effect in response to a drive signal is attached with both end surfaces connected to a base member and a lever mechanism connected to the base member. In an impact printing head having a structure in which a plurality of elements are stacked and attached, the base member and the lever mechanism are made of a metal material, the drive signal path is connected to at least one of them, and each of the piezoelectric The element consists of a plurality of internal electrode plates arranged parallel to both end faces at intervals within a columnar piezoelectric material, and one internal electrode plate on each of the internal electrode plates.
A first electrode is connected to the piezoelectric material and provided on one side of the piezoelectric material, and a second electrode is connected to the remaining internal electrode plate and connected from the other side of the piezoelectric material to at least one of both end surfaces. 1. An impact printing head comprising: an electrode, and a lead is connected to the first electrode of each of the piezoelectric elements for guiding the drive signal to a path.