JPS63208917A - Cursor control device - Google Patents

Abstract

PURPOSE:To ensure the smooth shift of a cursor by inverting the moving direction of a pointing device according to the ON/OFF operations of a switch. CONSTITUTION:A pulse generating circuit 1 outputs a pair of pulse signals 11 and 12 in response to the shift of a pointing device and leads out both signals 11 and 12 in accordance with the forward/reverse shifts of the pointing device. Then these signals 11 and 12 are used as the double inputs of selectors 2 and 3 respectively and these selectors output alternatively both double input pulse signals 11 and 12 in accordance with a command signal 13 sent from a switch 4. These output signals 14 and 15 are used as the inputs of a reversible up-down counter 5. Then, the count output 16 of the counter 5 is supplied to a control circuit 6 and the position of a cursor is controlled at a display part. Thus, a switching action is performed between the forward and reverse shift directions of the pointing device with the ON/OFF control of the switch 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cursor control device, and more particularly to a cursor control device using a mobile cursor pointing device.

Traditionally, mobile cursor pointing devices (hereinafter referred to as
Pointing devices (abbreviated as pointing devices) are capable of moving a cursor relatively quickly and with high precision.
Mechanical and optical types are used. One of these days,
The mechanical type is generally widely used because it is cheaper than the optical type.

In this mechanical structure, the pointing device is equipped with a roller, and the amount of rotation of the roller is divided into the horizontal direction (X coordinate direction) and the vertical direction (Y coordinate direction), and each direction is handled separately. The relative displacement is counted and stored by a counter provided therein.

A cursor is displayed on the display screen by reading the count contents of this counter by the host computer.

In such conventional pointing devices, since there is a proportional relationship between the amount of rotation of the roller and the contents of the counter, when positioning the cursor at a certain point,
You have to keep moving the pointing device in one direction. However, when using a pointing device in a confined space, the distance that can be moved is short, so -
I can't point the cursor to the desired position. Therefore, in this case, after moving the pointing device to the end of the movable area, remove the pointing device from the ground, reinstall it at an appropriate location, and then move it again to point the cursor. The drawback is that you have to do it.

Purpose of the Invention An object of the present invention is to enable smooth cursor movement without having to remove the pointing device from the ground surface and reinstall it when the pointing device is used in a narrow space. An object of the present invention is to provide a cursor control device.

Structure of the Invention According to the present invention, there is provided a pulse generation circuit that generates first and second pulse train signals in response to forward and reverse movement of a mobile cursor pointing device, respectively; and the first and second pulse train signals. and a reversible counting circuit for counting, and displays a cursor according to the count content of the counting circuit, the first and second inputs to the up input and down input of the reversible counting circuit. There is obtained a cursor control device characterized in that it has a selection circuit that selectively controls the supply state of the second pulse train signal, and the selection control state of the selection circuit can be instructed from the outside.

1 blind 1 Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the invention.

In the figure, a pulse generating circuit 1 generates a pair of pulse signals 11 and 1 in response to movement of a pointing device (not shown).
2, and pulse signals 11 and 1 are output according to the forward and reverse movement of the pointing device.
2 are derived respectively.

These pair of pulse signals 11 and 12 are both sent to the selector 2.
and 3 are powered by two people, and each of the selectors 2 and 3 selectively selects and outputs the two-man h pulse signals 11 and 12 in response to the command signal 13 from the switch 4. Selective output pulse signals 14 and 15 of both selectors 2 and 3
are the up and down inputs of the up/down counter 5, which is capable of reversible counting.

The count output 16 of the counter 5 is supplied to a control circuit 6, which controls the position of a cursor on a display section (not shown). , the count contents of the counter 5 are reset at a predetermined timing by a reset signal 17 from the control circuit 6.

In such a configuration, the pulse generation circuit 1 outputs data generated and input from a pointing device as a pulse signal 11 in response to movement of the pointing device in the positive direction, and outputs a pulse signal 1 in response to movement in the negative direction of the pointing device.
2 is output.

When switch 4 is off, selector 2 outputs pulse signal 11
is selected as output 14 and supplied to the up input of counter 5, selector 3 selects pulse signal 12 and outputs 15.
and supplies it to the down input of the counter 5. Further, when the switch 4 is on, the selector 2 selects the pulse signal 12 and outputs it as output 14, and supplies it to the up input of the counter 5. The selector 3 selects the pulse signal @11 and outputs it as output 15, and supplies it to the up input of the counter 5. Supplies down input.

Therefore, when the switch 4 is turned off, the pulse signal 11 generated when the pointing device moves in the positive direction becomes the up input of the counter 5 by the selector 2, and the pulse signal 1 generated when the pointing device moves in the negative direction.
2 becomes the down input of the counter 5 by the selector 3.

Furthermore, when the switch 4 is turned on, the pulse signal 12 generated when the pointing device moves in the negative direction becomes an up input to the counter 5 from the selector 2.
The pulse signal 11 generated when moving in the forward direction becomes a down input to the counter 5 by the selector 3.

In this way, the on/off control of the switch 4 can control switching between the positive and negative movement states of the pointing device, so the count-up operation of the counter 5 is performed not only when the pointing device moves in the positive direction, but also when the pointing device moves in the positive direction. By turning on the switch 4, this becomes possible even when moving in the negative direction.

Therefore, even when the pointing device is used in a narrow space, there is no need to remove the pointing device from the ground surface and reinstall it by simply turning on/off the switch 4, and the cursor can be moved smoothly without always leaving the ground surface. It is possible to control it.

Effects of the Invention As described above, according to the present invention, the direction of movement of the pointing device can be reversed by turning on and off the switch, so the cursor can be moved smoothly without always leaving the pointing device off the ground. Therefore, when using the pointing device in a narrow place, there is an advantage that there is no need to separate the pointing device from the ground surface each time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the invention. Explanation of symbols of main parts 1...Pulse generation circuit 2.3...Selector 4...Switch

Claims (1)

[Claims] A pulse generating circuit that generates first and second pulse train signals in response to forward and reverse movement of the mobile cursor pointing device, respectively, and a reversible counting circuit that counts the first and second pulse train signals. and a cursor control device that displays a cursor according to the count contents of the counting circuit, wherein the supply state of the first and second pulse train signals to the up input and down input of the reversible counting circuit is controlled. A cursor control device comprising a selection circuit that performs selection control, the selection control state of the selection circuit being able to be instructed from outside.