JPH02199525A - Coordinates input device - Google Patents

Abstract

PURPOSE:To switch the ratio of inter-point distances on an input screen and a display screen by switching the coordinate data itself of an input position inputted from an input part or a value obtained by integrating the difference between the coordinate data by a selection signal and sending the switched signal to a CPU. CONSTITUTION:When the input part 1 inputs data to the input face of a tablet 12 by an input tool 11, an input detecting circuit 13 generates an input display signal and the coordinate data of the input position, the input display signal is sent to a difference circuit 2 and an integrating circuit 3 and the coordinate data are sent to the circuit 2 and a selection circuit 4. The connection of the circuit 4 is controlled by a mode selection signal. When a tablet mode is instructed by the mode selection signal, the circuit 4 connects the coordinate data generated from the input part 1 to the CPU as it is. At the time of instructing a mouse mode, the moving variable data of the input tool 11 obtained by the circuit 2 are integrated by the circuit 3 and the integrated result is connected to the CPU.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a coordinate input device, and particularly to a coordinate input device for inputting figures and positions by manually inputting data onto a doublet input surface using an input tool such as a stylus. Regarding.

[Conventional technology]

When using a conventional coordinate input device of this type for positioning a cursor on a display screen, a 1:10 point correspondence is set in advance between the tablet input surface and the display surface, and tablet input using the input tool is performed. A processor (CP) generates data indicating the coordinates of the input point on the surface
Send it as is to U). The CPU composes an image signal to display a cursor at a position on the display screen corresponding to the input coordinates, and sends it to the display device. Therefore, if the input tool is moved on the tablet input surface during input, the location of the cursor on the display screen will also move accordingly.

[Problem to be solved by the invention]

The conventional coordinate input device described above is used by making each point on the tablet input surface correspond one-to-one to the point on the display screen, so the ratio of the distance between the points on the input surface and the distance between the points on the screen is In order to enable switching, it is not enough to simply equip a CPUt and a processing program for each ratio; it is also necessary to prepare multiple tablets with dimensions corresponding to each ratio.As a result, the input device There is a problem that the space occupied by the device increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a coordinate input device that solves the above-mentioned problems and allows switching of the distance ratio between points on an input surface and a display screen using the same tablet.

[Means to solve the problem]

The apparatus of the present invention includes a coordinate input means for generating a first electric signal indicating the coordinates of an input point and a second electric signal indicating that the input is in the input period when inputting to the input surface by the input tool; a differential circuit that reads the first electrical signal at the start time of the period for each period, subtracts it from the sequentially sent first electrical signal, and sends the result; and an integration circuit that reads the output signal of the differential circuit and adds the output signal to the output signal of the differential circuit that is sequentially sent during the input period immediately after this and outputs the signal.

〔Example〕

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

FIG. 1 is a block diagram showing one embodiment of the present invention. In the input unit 1, when input is made to the input surface of the tablet 12 using the input tool 11, the input detection circuit 13 generates an input display signal indicating that an input has been made and coordinate data indicating the coordinates of the input location. . An input display signal indicating the presence or absence of input is sent to the difference circuit 2 and the integration circuit 3. Further, the coordinate data is sent to a difference circuit 2 and a δ selection circuit 4. The connection of the selection circuit 4 is controlled by a mode selection signal. In this embodiment, a tablet mode in which each point on the input surface of the tablet 12 corresponds one-to-one with a point on a display screen (not shown), and a mouse control mode is adopted in which each point on the input surface of the tablet 120 is integrated with the amount of movement of the input tool 11 on the input surface of the tablet 120. You can select a mouse mode that allows similar operations. When the tablet mode is designated by the mode selection signal, the selection circuit 4 connects the coordinate data generated by the input section 1 to the CPU as is, and obtains the same operation as the conventional device.

When the mouse mode is specified by the mode selection signal,
The data of the movement amount of the input tool 11 obtained by the difference circuit 2 is integrated by the integration circuit 3, and the result is connected to the CPU. That is, each time an input operation is performed to draw a line segment on the input surface of the tablet 12 with the input tool 11, an input display signal indicates that an input has been made between the start point and the end point of each line segment, and coordinate data of the input tool 11 is displayed. Indicates the coordinates of each passing point. The latch circuit 22 of the difference circuit 2 reads coordinate data for each line segment input starting point and continues to send it to the subtracter 23. Subtractor 2
3 subtracts the output data from the latch circuit 22 from the coordinate data to obtain data on the amount of movement from the line segment input starting point and sends it to the integration circuit 3. The latch circuit 32 of the integration circuit 3 first resets the read content to zero (or sets it to appropriate data) when the mouse mode is specified, and then reads the output data of the adder 33 at each of the above-mentioned line segment input end points. The contents continue to be sent to the adder 33. The adder 33 adds the data sent from both the difference circuit 2 and the latch circuit 320 to obtain integrated data of the amount of movement of the input tool 11 since the start of the mouse mode, and sends it to the CPU via the selection circuit 4.

As mentioned above, when inputting in the mouse mode, each time a line segment is drawn on the input surface of the tablet 12 with the input tool 11, the CP
The data value sent to U is added and changed by an amount corresponding to the amount of movement of the input tool 11 from the starting point of the line segment. Therefore, if you repeatedly input line segments to the input surface,
The values of coordinate data sent to the CPU can be changed without being restricted by the dimensions of the input surface of the tablet 12. As a result,
Even when using an increased point-to-point distance ratio between the input surface and the display screen, it is no longer necessary to prepare a separate tablet with a large input surface to match the increased ratio, as was the case with conventional devices. You can use it as is.

〔Effect of the invention〕

As described above, the present invention has the effect of realizing a coordinate input device that can switch the distance ratio between points on the input surface and the display screen using the same tablet.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention. ■...Input section, 11...Input tool, 1
2...Tablet, 13...Input detection circuit, 2...Differential circuit, 3...Integrated circuit, 22.32...Latch Circuit, 23...
...Subtractor, 33...Adder, 4...
selection circuit. Agent Patent Attorney Susumu Uchihara-7→・

Claims (1)

[Claims] A first electric signal indicating the coordinates of the input point when inputting to the input surface by the input tool, and a second electric signal indicating that the input period is in progress.
a differential circuit that reads the first electrical signal at the start time of the period for each input period, subtracts it from the sequentially sent first electrical signal, and sends the result. , an integrating circuit that reads its own output signal at the end time of the input period for each input period, adds it to the output signal of the differential circuit that is sequentially sent during the input period immediately after, and outputs the signal. A coordinate input device characterized by: