JPS5968036A - Key switch unit - Google Patents

Abstract

PURPOSE:To control a cursor, etc. with extreme ease by changing moving directions depending upon a depressed key of a switch unit and varying a moving speed according to a depressed position of the key. CONSTITUTION:When a key top K is pressed with a finger, conductive rubber R is pressed down and switch contacts ca and cb are brought into contact with each other to detect the depression position electrically. This detection is performed when no key top is pressed or when either or both of points (a) and (b) are pressed. Then, a CPU1 reads the states of information lines L4 and L5 on contacts ca and cb of the pressed key switch out of a buffer 4 through an address signal line L2 and a data line L1 when the depression of the key switch is reported through a signal line L3. The moving direction and speed of the cursor corresponding to those piece of depression information are outputted to a display device interface part 5 to move the cursor on the screen of a display device 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (I) Technical Field The present invention relates to a key switch unit that outputs speed information that differs depending on where a key is pressed, and relates to a key switch unit that is used, for example, to control the speed of cursor movement on a display section.

(6)) Prior Art The moving speed of a conventional cursor, etc. is constant, and it takes a lot of time to move the cursor to a desired position on the display screen. For example, the display screen is 80 digits x 4 as shown in Figure 1.
In the case of an 8-line display device, when moving the cursor Zf from point A (12th line) to point B (1st line), repeat the operation of pressing the cursor movement key 11 times, or press 1
In order to move from point A to point B at a constant speed by using the repeat function, which performs the same function as if the same key was input many times when one key is pressed continuously,
There is a drawback that it is not possible to quickly move the cursor to a desired position and perform tasks. Furthermore, the movement direction designation keys are often located at positions far apart from each other, often resulting in erroneous inputs or long input times.

(G) Purpose In order to eliminate the above-mentioned drawbacks, the present invention provides different speed information depending on the direction of movement depending on the key pressed on the key switch unit and the location where the key is pressed, thereby making it possible to quickly move an object to be moved. The present invention provides a key switch unit.

(IV) Embodiment An example in which a key switch unit is used for moving a cursor will be described as an embodiment of the present invention with reference to the drawings. This embodiment is a key switch unit having multiple contacts as a cursor moving key. The cursor movement speed changes depending on the position on the key switch that is pressed.For example, the speed at which the cursor moves to the right when point a is pressed in Figure 3 is different from when the point b is pressed. The cursor movement speed is different. That is, the moving speed of the cursor becomes faster as it moves from point a to point b. Here, the key to move the cursor to the right is taken as an example, but the same holds true for moving the cursor up and down and to the left, and the further the outer position is pressed, the faster the cursor moves.

In FIG. 3, K is a key top, R is a conductive rubber, P is a printed circuit board, and ca and cbfd switch contacts.

When the key top K is pressed down with a finger, the conductive rubber R is pressed down and the switch contacts ca and cb come into contact and the pressed position is electrically detected. Detection was performed for four conditions: when no button is pressed at all, when only point a is pressed, when both points a and b are pressed, and when only point b is pressed. It will be done. FIG. 4 is a block diagram of this embodiment, in which the CPU 1 includes a central processing unit,
ROM2 is a read-only memory where programs are stored; RAM3 is a readable/writable memory; Ll is a data line; L2 is an address signal line; I/F5 is a display device (DSP
) 6 is an interface section, 6 is a display device, BUF4 is a buffer circuit, and L3 is an interrupt signal line.

The operation will be explained with reference to FIGS. 4, 5, and 6. Here, the cursor moving key switch of this embodiment is simplified to one direction only, and is shown in FIG.

On the other hand, the operation is the same for the internal portion. Normally CPU is ROM2
While a normal program is being executed, when a key switch for moving the cursor is pressed, the pressing of the key switch is interrupted by interrupt line L3 from BTJF4-4.
Notified by UI. (Step 10) CPU1 is L
When the pressing of the key switch is reported from 3, the states of the information lines L 4 and L5 of the contacts ca and cb of the pressed key switch are read from the data line L1 from the BUF 4 using the address signal line L2. (Step 11) This is the same as the control method in a normal information processing system. A unique address is assigned to BUF4, and when the assigned address is sent, BUF4 is transferred to data line L1 from L4. L
This is a method in which the information in step 5 is output and the CPUI inputs that information.

CPU 1 takes in L4 and L5 and determines the cursor movement direction, movement speed, etc. corresponding to the states of L4 and L5,
Execute. (Steps 13 to 18) Here, when the switch is pressed, the switch contact signal (L4L5) is 0, and when it is not pressed, it is 1. An example of the correspondence between the switch contact state and the cursor movement speed is shown in Figure 5. The cursor/h movement is executed until the cursor movement 11jl and the + key switch are released from being pressed (step 12).

When the CPU inputs the key switch press information in this way, it outputs the moving direction and speed of the cursor corresponding to the press information to the display device interface unit (I/F) 5, and the I/F 5 outputs the cursor movement direction and movement speed to the display device interface unit (I/F) 5, and the I/F 5 outputs the cursor movement direction and movement speed corresponding to the press information. The cursor on the screen of the display device 6 is moved through.

In this embodiment, a two-contact key switch is provided as the cursor movement key switch, but it can also be implemented with multiple contacts of two or more contacts. In addition to cursor movement, this key switch unit can be used for various controls such as manual positioning of an XY plotter, positioning of cranes, conveyors, etc. for one-dimensional or three-dimensional movement to speed up processing.

M Effects As described above, according to the key switch unit of the present invention, the moving direction can be varied depending on the key pressed on the key switch unit, and the moving speed can be varied depending on the position where the key is pressed.

Since the movement direction specifying key switches are close to each other, changing the movement direction becomes easy and can be performed with fewer erroneous inputs. Further, by making the moving speed variable for a moving object that moves two-dimensionally or three-dimensionally, it becomes possible to move very easily and quickly.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the positional relationship of the cursor on the display screen, Fig. 2 is a front view of the key switch for moving the cursor, Fig. 3 is a mechanical diagram of the key switch for moving the cursor, and Fig. 4 is the present embodiment. FIG. 5 is a diagram showing the relative relationship between the switch press position and the cursor movement speed, and FIG. 6 is a control flowchart. In the figure, 2...Cursor, Ca...Switch a
switch contact of switch b, cb... switch contact of switch b, 5... interface section for display device, 6... display device. Patent applicant: Canon Co., Ltd. Figure 1, Figure 2, Figure 2, Figure 4, Figure 5, Figure 6.

Claims (1)

[Claims] A key switch unit that is a unit consisting of a set of multiple keys that output control information in different directions, and has an output section that outputs different speed information depending on where the key is pressed.