JPS6146853B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a piezoelectric device used in a terminal input device that provides information signals to an electronic computer, etc., which uses an impact pen as an input means and a printed wiring board coated with a piezoelectric layer as a detection element. This invention relates to a shape coordinate input device.

With the spread of computer systems in recent years, terminal input devices connected to computer systems are
There has been a demand for a device that has a simple structure and input operation, is capable of inputting a large number of information signals, is inexpensive to manufacture, and has a wide range of applications.

Various types of coordinate input devices have been proposed for use in this terminal input device, such as a capacitive coupling type, an optical type, and a contact switch type.

However, all of these conventional methods require parts that switch to positions that make up each unit coordinate,
It is necessary to incorporate components that serve as electrical signal generation sources, and the structure of the device becomes complicated, including the wiring between these components.

The present invention solves the difficulties in these conventional devices, and the surface of the detection electrode on the printed circuit board covered with the piezoelectric layer is subjected to an impact from an impact pen via a contact plate placed on the piezoelectric layer. The present invention provides a piezoelectric coordinate input device having a configuration that allows stable input of information signals simply by applying force.

Therefore, unlike conventional devices, the piezoelectric coordinate input device of the present invention does not require components such as contact switches, electromagnetic switches, and magnetoelectric conversion elements to be provided at each coordinate point, and is thin, compact, and robust. The structure can be realized, and the device according to the present invention can input a large number of information signals by simple operation.

Furthermore, in the present invention, a replaceable page board displaying specific characters or symbols is stacked on the pen guide board, and a page information identification circuit for identifying information on the page board is connected to the device. ,
The present invention provides an apparatus for applying a plurality of mutually different information signals to one coordinate point using an impact pen.

The present invention will be described in detail below based on examples thereof.

FIG. 1 is a cutaway perspective view of a main part of a printed wiring board used in an embodiment of a piezoelectric coordinate input device according to the present invention. FIG. 3 is a partially enlarged principle diagram of an embodiment of the piezoelectric coordinate input device according to the present invention.

As shown in FIGS. 1 and 3, detection electrodes 2X, 2Y, through holes 3, and readout lines 4 are printed on the printed wiring board 6.

The two detection electrodes 2X and 2Y are formed electrically independent of each other, and the detection electrode 2X is connected to a readout point in the coordinate X direction arranged on the lower surface of the printed wiring board 6 via a through hole 3X. Connected to line 4X.

On the other hand, the detection electrode 2Y is connected to a readout line in the coordinate Y direction provided on the lower surface of the printed wiring board 6 via another through hole.

In this case, for example, the readout line 4X and the readout line 4Y are arranged separately on the upper and lower surfaces of the printed wiring board 6 so that they do not intersect with each other.

On the surface of the printed wiring board 6, a piezoelectric layer 5 made of a piezoelectric material is laminated in close contact with the surface of the printed wiring board 6.

With this configuration, the impact pen 1 is used to input information signals by pairing the detection electrodes 2 corresponding to coordinates X and Y with the same number and applying an impact force thereto. will be carried out.

In this case, if the detection electrodes formed on the printed wiring board 6, for example, 2X and 2Y, are configured to be close to each other to a certain extent, the voltage generated due to the interelectrode capacitance formed here can be Since noise voltage will be induced in the detection electrode, the coordinate
The detection electrodes in the and Y directions are arranged at a certain distance from each other, and when applying an impact force with the impact pen 1, the contact plate 7 is placed across both electrodes and faced as shown in FIG. Use in the configured configuration.

Since this contact plate 7 also has a function as a ground electrode, this configuration reduces stray capacitance, improves the S/N ratio, and expands the pressure contact range on the detection electrode 2 of the impact pen 1. becomes possible.

In this case, in order to prevent distortion of the output voltage waveform and generation of secondary voltage, the contact plate 7 is installed as shown in FIG.
For example, a resin buffer plate 8 is stacked on top of the buffer plate 8.
If an input information signal is applied by pressing the impact pen 1 from above, the output voltage waveform can be significantly improved, and malfunctions caused by secondary voltages can be significantly reduced.

In actual use of the device, a hole having a predetermined relationship with the shape of the tip of the impact pen 1 is used to easily press the impact pen 1 onto the detection electrodes 2X and 2Y as shown in FIG. By fixing a pen guide plate 9 having a section under the page board 10 to guide the movement of the tip of the impact pen 1, it is possible to prevent malfunctions and efficiently provide information signals.

On the page board 10, information in which input information signals are displayed in the form of predetermined characters or symbols is arranged in a matrix.
It will be applied to the printed wiring board 6 via.

FIG. 2 is an external view of an embodiment of the piezoelectric coordinate input device according to the present invention.

As shown in the figure, the page board 10 is configured so that it can be replaced by, for example, turning over the page, so that it is possible to efficiently input a large number of matrices using a large number of page boards.

FIG. 4 is a block diagram showing the connection relationship of the embodiment of the piezoelectric coordinate input device according to the present invention when it is in use.

By connecting as shown in the figure and operating the device, it becomes possible to convert the output signal voltage from the coordinate points.

In this case, the output signal from the readout line 4 is mainly from an IC mounted on the same printed wiring board 6.
The signal is sent to the code conversion circuit 12 via a signal receiving circuit 11 consisting of a signal receiving circuit 11 and a page information identification circuit 13 that identifies page information, and is converted into a coded signal, which is used as an input signal for, for example, a computer. Ru.

As explained in detail above, according to the piezoelectric coordinate input device according to the present invention, by using a printed wiring board having a structure in which a piezoelectric layer is integrally coated on the surface thereof, a large number of coordinate points can be input. To provide a piezoelectric type coordinate input device which realizes a solid and compact structure in which a matrix structure having a matrix structure is housed in a single printed circuit board without requiring assembly of parts or wiring, and which has high operational reliability. In addition, the present invention provides a piezoelectric coordinate input device that uses a contact plate, a page board, and a page information identification circuit, and enables input of a large number of information signals by simple operation with an impact pen.

[Brief explanation of the drawing]

FIG. 1 is a cutaway perspective view of a main part of a printed wiring board used in an embodiment of a piezoelectric coordinate input device according to the present invention, and FIG. 2 is an external view of an embodiment of a piezoelectric coordinate input device according to the present invention. FIG. 3 is a partially enlarged principle diagram of an embodiment of the piezoelectric coordinate input device according to the present invention, and FIG. 4 is a block diagram showing the connection relationship in the use state of the embodiment of the piezoelectric coordinate input device according to the present invention. . Explanation of symbols, 1...Impact pen, 2, 2X, 2Y
...Detection electrode, 3,3X...Through hole,
4,4X...readout line, 5...piezoelectric layer, 6...printed wiring board, 7...contact plate, 8...buffer plate,
9...Pen guide board, 10...Page board, 11...
... Signal receiving circuit, 12 ... Code conversion circuit, 13
...Page information identification circuit.

Claims (1)

[Claims] 1. A printed wiring board in which coordinate points constituted by a plurality of detection electrodes are arranged in a matrix, a piezoelectric layer coated on the printed wiring board, and a piezoelectric layer formed on the detection electrode to be connected to the detection electrode. a contact plate stacked on the piezoelectric layer and grounded so as to straddle the protrusions provided opposite to each other; a buffer plate covering the contact plate; and a coordinate point formed on the buffer plate. A pen guide plate that enables the tip of the impact pen to be pressed against a predetermined position on the detection electrode and the detection electrode arranged in a matrix are connected to read out a signal voltage generated by the impact force of the impact pen. a replaceable page board stacked on the pen guide board, and a page information identification circuit that identifies the information on the page board, and the impact pen is configured to identify a plurality of mutually different pieces of information at one coordinate point by the impact pen. A piezoelectric coordinate input quantity characterized in that it gives information about.