JPS60150124A - Coordinate input detecting plate - Google Patents

Abstract

PURPOSE:To obtain a transparent coordinate input detecting plate which has no blind spot and also facilitates a copy input of a drawing, by putting a transparent insulated fluid between two transparent detecting plates as a spacer. CONSTITUTION:A hollow packing 20 made of resin is held between coordinate input detecting plates 14 and 15 made of conductive transparent film, and a transparent insulated fluid oil is filled into the hollow space and sealed up. Thus a space is formed between both plates 14 and 15. Electrodes 16-19 are provided at two sides of both plates 14 and 15 respectively, and an input is carried out by a pen 22 over the plate 14 and with pressure higher than a prescribed level. Thus the electrodes 16-19 touch the plate 15 and conduct. In this case, a fixed level of voltage is applied between electrodes 16 and 17 by a position detecting circuit 23. As a result, the split voltage corresponding to a position in the X axis direction of the pen 22 is led to an electrode 18. On the contrary, the split voltage corresponding to a position in the Y axis direction of the pen 22 is led to the electrode 16 by a fixed level of voltage is applied between electrodes 18 and 19 by the circuit 23. Thus it is possible to obtain the position information on the input coordinates of the pen 22.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a coordinate input detection board for detecting an input position in a coordinate input device for inputting handwritten characters and the like.

Conventional Structures and Problems Generally, coordinate input devices detect the coordinate position of a pen in order to input handwritten characters. The detected character information is sent to a converter or the like and displayed on a display device such as a CRT.

Conventionally known coordinate input devices are equipped with detection plates for detecting the coordinate positions in the X-axis direction and Y-axis direction, respectively, in order to know the position of the pen for manual handwriting. There is a system in which the pen position coordinates are determined by receiving a position signal from a detection plate by the pen through inductive or capacitive coupling between the pen and the pen, or by receiving a signal from the pen by the detection plate.

Another conventionally known coordinate input device uses a resistor plate whose resistance values are uniformly distributed.

A conventional configuration using this resistor plate will be described below with reference to Figure Ij.

FIG. 1 is a block diagram of a conventional coordinate input device using a resistance plate. 1, a resistive film 4 having a uniform resistance value is attached to the lower surface of an insulating plate 3 which is flexible so that a point inputted with a pen 2 is deformed downward, and electrodes 6 are attached to two opposite sides of the resistive film 4. 6 is the first detection plate. First detection plate 1
A resistive film 8 having a uniformly distributed resistance value is attached to the soil surface of the insulating plate 7 below, and electrodes 9 and 10 (with iz and Further, insulating particles 11 are deposited on the resistive film 8 at predetermined intervals as spacers for insulating the resistive film 8 from the first detection plate 1 (a second detection plate 12 is provided facing each other). When there is no input from the pen 2, the first detection plate 1 and the second detection plate 12 are not electrically connected due to the insulating particles 11. If a predetermined pressure or higher is input to any point from above, the first detection plate 1 is flexible, so it becomes electrically connected to the second detection plate 12 at the input point.At this time, for example, the electrode If a constant voltage is applied between electrodes 5 and 6, a divided voltage that is opposite to the position of the pen 2 in the X-axis direction will be derived at electrode 9, and conversely, if a constant voltage is applied between electrodes 9 and 5, the divided voltage corresponding to the position of the pen 2 in the Y-axis direction is derived, so the coordinates of the input position of the pen 20 can be known.A constant voltage is applied between these series of electrodes, and the divided voltage is calculated from the other electrodes. The position detection circuit 13 derives the voltage and alternately switches between these two operations in the X-axis direction and the Y-axis direction.The position detection circuit 13 converts the input divided voltage from analog to digital and outputs it as position information. The information is output to a calculation device.The calculation device can determine the coordinates of the input position of the pen 20 by performing simple calculations, and can also display characters input with the pen 2 on a display device such as a CRT.

The above is a conventional coordinate input device, but since this method uses insulating grains as spacers, the two detection plates do not conduct even when pen input is made directly above the insulating grains.
There is a major problem in that a so-called blind spot occurs.

Further, as an application of the coordinate input device, drawings already drawn on paper are often input into the arithmetic device. In this case, the drawing is often placed on the detection plate and traced from above with a pen, but this has the disadvantage that the drawing is easily damaged by the pressure of the pen.

Another drawback is that the input status of the drawing being copied can only be checked on a remote CRT or the like, and cannot be checked at hand.

This tends to cause input errors and input errors. In addition, a drawing drawn on a material chamber such as a glass plate has the disadvantage that it is impossible to input data by tracing from above.

OBJECTS OF THE INVENTION It is an object of the present invention to solve the problems of the prior art and to provide a transparent coordinate input detection board that has no blind spots and facilitates the copying and input of drawings.

Structure of the Invention The coordinate input detection plate of the present invention is composed of a transparent insulating fluid filled as a spacer between two opposing transparent detection plates, and an insulating backing provided to prevent this transparent insulating fluid from flowing out. There is.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail based on one embodiment with reference to the drawings.

FIG. 2 is a configuration diagram of a coordinate input device using a coordinate input detection plate according to an embodiment of the present invention. The first detection plate 14 and the second detection plate 15 have electrodes 16 on two sides of the conductive transparent film.
, 17, 18, and 19 are provided. The conductive film is a well-known film, and is made by uniformly coating a resistive material such as indium oxide on a transparent film such as polyester (2
It has electrical conductivity. Further, the first detection plate 14 and the second detection plate 15 are pasted together with their conductive surfaces facing each other through a resinous backing 2o whose central portion is hollow. First detection plate 14. A space surrounded by the second detection plate 16 and the backing 2o is filled with insulating oil, which is a transparent insulating fluid, and a backing 20Tmlj is provided to prevent this insulating oil from flowing out. FIG. 3 is a sectional view of the coordinate input detection plate shown in FIG. 2. As shown in the figure, insulating oil 21 is filled between the first detection plate 14 and the second detection plate 15 as a spacer to maintain insulation between the detection plates.

With the above configuration, when an input is made using the pen 22 from above the first detection plate with a pressure higher than a predetermined level, the first detection plate 14 is flexible, so that the input point of the pen 22 is applied to the second detection plate as shown in FIG. It contacts the detection plate 16 and becomes electrically conductive. At this time, for example, if a constant voltage is applied between the electrodes 16 and 17 by the position detection circuit 23, a divided voltage will be derived from the electrode 18 corresponding to the position of the pen 22 in the If a constant voltage is applied by the position detection circuit 23 between
A divided voltage corresponding to the position of the pen 22 in the Y-axis direction is derived from the pole 16, and position information of the input coordinates of the pen 220 can be obtained. When the input pressure of the pen 22 is removed, the first detection part 14 and the second detection plate 15 are separated due to the flexibility of the first detection plate 14 and the pressure transmission of the insulating oil 21, and the insulated state is restored. to return to. The voltage derived from the electrodes and containing positional information is converted from analog to digital by the position detection circuit 23 and output to the arithmetic unit, and furthermore, human characters can be displayed on a display device such as a CRT.

As described above, this coordinate input detection board has no dead points and can continuously detect the position of the pen 22 at all points on the detection board.

Also, since this coordinate input detection board is entirely transparent, copying a drawing can be easily achieved by placing the coordinate input detection board on top of the drawing and tracing over it while looking at the drawing below. . In addition, by installing a display device such as a dot matrix type liquid crystal display device under this coordinate input detection board and blinking the dots in the coordinate input section of the coordinate input detection board, it is possible to display handwriting. I can do it.

Effects of the Invention As described above, the coordinate input detection plate of the present invention eliminates the conventional blind spot by using two transparent detection plates and a transparent insulating fluid as a spacer between them. A coordinate input detection board can be provided. With this coordinate human power detection board, input can be made over all points, and it is possible to provide an excellent coordinate input device that has good operability when copying drawings, and has good expandability to include a handwriting display function.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a coordinate input device using a conventional coordinate input detection board, Fig. 2 is a configuration diagram of a coordinate input device using a coordinate human power detection board according to an embodiment of the present invention, and Fig. 3 is a configuration diagram of the coordinate input device using a coordinate input detection board according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the plate. 14 Pa...First detection plate, 16 °゛°°°°Second plate, 20...Packing, 21...Insulating oil. Name of agent: Patent attorney Toshi Nakao, male and 1 other person
figure

Claims (2)

[Claims] (1) A space is formed by placing a backing between a first sensing plate made of a flexible transparent material and a second sensing plate made of a transparent material, and this space is filled with a transparent insulating fluid to input coordinates. detection board. (2) The coordinate input detection plate according to claim 1, wherein the first detection plate and the second detection plate are each provided with electrodes on two opposing sides of a conductive transparent film.