JPS5816504B2 - Pressure-sensitive handwritten figure input device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure-sensitive handwritten figure input device that is inexpensive and has a high input speed.

A conventional pressure-sensitive handwritten figure input device is shown in FIG.

In FIG. 1, reference numeral 10 denotes a pressure-sensitive conductive sheet, and on the front and back surfaces of the pressure-sensitive conductive sheet 100, conducting wire groups X1 to Xm and Y1 to Yn are arranged orthogonally to each other.

Each conductor in these conductor groups X1 to Xm is connected to a power source E via a changeover switch SX, ~SXm, and the conductor in conductor group Y
Each conductor in 1 to Yn is connected to a changeover switch SY1 to SYn.
and is grounded via a load resistor R.

Further, 11 is an X counter whose period is the number m of the conductor groups X1 to X□, 12 is an X counter whose period is the number n of the conductor groups Y1 to Yn, 13 is an X decoder, 14 is a Y decoder, 1
5 is a clock pulse generator, 16 is a bell detection! , 17
is an AND gate, the output of the X counter 11 is sent to the X decoder 13, and the output of the X counter 12 is sent to the Y decoder 14.

The signal decoded by the X decoder 13 is sent to the changeover switches SX1 to SXm, and these changeover switches SX
1 to SXm are turned on sequentially, and the signal decoded by the Y decoder 14 is transferred to the changeover switches SY1 to SY.
n, and these changeover switches SY1 to SYn are sequentially turned on.

The X counter 12 is counted up by the clock pulse from the clock pulse generator 15, and the X counter 11 is counted up by the overflow pulse of the X counter 12.

As a result, all mXn intersections in the pressure-sensitive conductive sheet 10 can be scanned, and if any of the mXn intersections in the pressure-sensitive conductive sheet 10 is pressed with the pen in this state, then , the resistance value of the pressure-sensitive conductive sheet 10 at the pressed location decreases, and current flows through the load resistor R via the Y-side changeover switch and the Y-side changeover switch that are in the on state at that time.

Therefore, the potential at the connection point A between the load resistor R and the Y-side changeover switch changes, and this potential change is detected by the level detector 16 to generate a count stop signal.

This count stop signal closes the AND gate 1γ, stopping the transmission of the clock pulse to the X counter 12, and the X counter 12 stops.

When the X counter 12 stops, the X counter 11 is stopped,
The values of the X counter 11 and the X counter 12 at that time were pressed down with the pen.

This is a code that indicates the coordinates of a location.

Since the conventional pressure-sensitive handwritten figure input device was constructed as described above, it required mXn driving or selection operations to scan the input panel once, resulting in a very slow input speed, and Since a changeover switch is provided for every conductor, the number of changeover switches becomes enormous and the cost becomes high.

Therefore, an object of the present invention is to improve the above-mentioned drawbacks of the prior art, in which a first conducting wire group consisting of a plurality of narrow conducting wires arranged parallel to each other in a first direction is closely attached to a first surface, a first pressure-sensitive conductive sheet having a second conductive wire group formed of a plurality of narrow conductive wires arranged parallel to each other in a second direction orthogonal to the first direction; A first plane electrode group consisting of a plurality of plane electrode plates arranged in four rows parallel to each other and having a width corresponding to the plurality of conductors of the first conductor group is in close contact with the first surface, and a second pressure-sensitive conductive sheet having a second plane electrode group made up of a plurality of plane electrode plates arranged parallel to each other and having a width corresponding to the plurality of conductors of the second conductor group, and closely adhered to the second surface; , sequentially and selectively scanning each plane electrode plate group on the second pressure-sensitive conductive sheet, and detecting a change in resistance value of the second pressure-sensitive conductive sheet in a region corresponding to the pressurized raw point; means for detecting the upper bits of each of the X code and the Y code at the position of the pressed element point; and each conducting wire on the first pressure-sensitive conductive sheet; By sequentially and selectively scanning within a small group of conducting wires and simultaneously between different small groups, and detecting a change in the resistance value of the first pressure-sensitive conductive sheet at a pressurized raw point, means for detecting lower bits of each of the X code and the Y code at the position of the pressed raw point, the first pressure sensitive conductive sheet and the second pressure sensitive conductive sheet being laminated with an insulating layer interposed therebetween. The present invention relates to a pressure-sensitive handwritten figure input device characterized by:

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a configuration diagram of the input panel in the first embodiment of the present invention, where 41 is an electrode plate for detecting the X area, 42 is an electrode plate for detecting the X area, 43 and 46 are pressure-sensitive conductive sheets, and 44 is an electrode plate for detecting the X area. X electrode plates 45 are X electrode plates, which are stacked in close contact with each other.

X-area detection electrodes XA1 to XAi are formed on the surface of the X-area detection electrode plate 41 that is in contact with the pressure-sensitive conductive sheet 43,
Y-area detection electrodes YA1 to YAi are formed on the surface of the X-area detection electrode plate 42 that is in contact with the pressure-sensitive conductive sheet 43, and the X-area detection electrode plate 41, the X-area detection electrode plate 4
2 and the pressure-sensitive conductive sheet 43 constitute a writing area detection section.

Furthermore, X conductor groups X1 to Xrn are formed on the surface of the X electrode plate 44 that is in contact with the pressure-sensitive conductive sheet 46, and Y conductor groups Y1 to Yn are formed on the surface of the X electrode plate 45 that is in contact with the pressure-sensitive conductive sheet 46.
The X electrode plate 44, the X electrode plate 45, and the pressure-sensitive conductive sheet 46 constitute a writing point detection section.

Further, the writing area detection section and the writing point detection section are electrically insulated by the base materials of the X area detection electrode plate 42 and the X electrode plate 44.

FIG. 3 is a block diagram relating to the first embodiment of the present invention. In this figure, the numbers of both the X conductor group and the Y conductor group are 16 each, and both the X area and the
An example is shown in which the area corresponding to a book is one area, and the input board surface is divided into 16 areas.

X area detection electrodes XA1 to XA are each switch S
X A, ~S X A, connected to power supply E via Y
Area detection electrodes YA and ~YA4 are each switch 5Y.
It is grounded via A1-5YA4 and load resistor R1.

On the other hand, each conductor of the X conductor group ~SY4 and is further grounded via load resistor R2.

Further, in FIG. 3, 4γ is the X area counter, 48 is the X area counter, 49 is the X counter, 50 is the X counter, 5
1 is a clock pulse generator, 52 is an X-area decoder, 5
3 is an X area decoder, 54 is an X decoder, 55 is a Y decoder, 56 is a flip-flop, 57 and 58 are AND gates, 59 and 63 are level detectors, 60 and 64 are strobe pulse generators, 61 is an X Area register, 62 is X area register, 65 is X register, 66
is the Y register.

The X-area counter 4γ and the X-area counter 48 have a period corresponding to the number of each X-area, and the X-counter 49 and the X-counter 50 have a period corresponding to the number of conducting wires in one area in the X direction and Y direction, respectively.

Of these counters, the X-area counter 48 and the X-counter 50 are counted up by clock pulses from the clock pulse generator 51, and
is counted up by the overflow pulse of the X area counter 48, and the X counter 49 is counted up by the overflow pulse of the X area counter 48.
It is counted up by an overflow pulse of 0.

The output of the X-area counter 47 is sent to the X-area decoder 52, and the output of the X-area decoder '52 sequentially turns on the changeover switches 5XA1 to 5XA4, and similarly the changeover switches 5YA1 to 5YA4 . SX1~sx4. s
y1 to SY are sequentially turned on by the outputs of the X area decoder 53, the X decoder 54, and the Y decoder 55, respectively.

As a result, the X conductor group X11 and Y
All intersections with the conductor groups Y1 to Y16 can be scanned.In addition, in the initial state, the outputs of the flip-flop 56 on page 02 are ``O11, 1'', respectively, so the AND gate 57 is opened. ,and.

The gate 58 is closed and the clock pulses from the clock pulse generator 51 are sent to the X area counter 48 and
The counter 50 is stopped.

Therefore, only the writing area detection section is scanned.

Now, point P on the input panel is written down with a pen; the resistance values of the pressure-sensitive conductive sheets 43 and 46 at point P decrease rapidly, and the resistance of the X-area detection electrode XA3 and the Y-area detection electrode YA and become conductive, and the X conductor X11
and the Y conducting wire Y14 are brought into conduction.

In this state, changeover switch 5XA3 and changeover switch 5Y
When A4 is turned on, the potential to the connection point between Y-area detection electrode YA4 and load resistor R1 changes.

This potential change is detected by the level detector 59, and the output of the level detector 59 causes the strobe pulse generator 6 to
0 operates and its output sets flip-flop 56.

The output Q of the flip-flop 56 becomes '0' and closes the AND gate 57, the clock pulse to the X-area counter 48 is stopped, and the X-area counter 47 is also stopped at the same time as the X-area counter 48 is stopped.

Stopped X area counter 47 and X area counter 48
The contents of are stored in the X-area register 61 and the X-area register 62, respectively, by a strobe pulse from the strobe pulse generator 60.

On the other hand, the output Q of flip-flop 56 is! 4111, opens the AND gate 58, sends a clock pulse to the X counter 50, and starts scanning the writing point detection section, and when the changeover switch SX3 and the changeover switch SY2 are turned on, the changeover switch SY2 and the load resistor R2 The potential at connection point B changes.

This potential change is detected by the level detector 63, and the output of the level detector 63 causes the strobe pulse generator 6 to
4 operates, and its output causes the flip-flop 56
is reset.

The output Q of the flip-flop 56 becomes 0'', which closes the AND gate 58 and stops the X counter 50 and the X counter 49.

The contents of the stopped X counter 49 and X counter 50 are stored in the X register 65 and X register 6 by the strobe pulse from the strobe pulse generator 64 as the lower bits of the code indicating the coordinates of the writing point P in the
6.

At this time, the contents of the X area register 61 and the X area register 62 are stored in the X register 65 and the X register 66 as the upper bits of the code indicating the coordinates of the writing point P in the X direction and the Y direction, respectively. Detection ends.

As explained above, according to the present invention, it is sufficient to perform the driving operation 4×4+4×4=32 times to scan the input panel surface once, and the number of changeover switches is 16.

On the other hand, according to the conventional device, 16×16=256 drive operations are required to scan the input panel surface once, and the number of changeover switches is 32.

Therefore, according to the present invention, there is an advantage that the input speed is increased and the number of changeover switches is reduced, and this advantage becomes more noticeable as the number of detected element points within the input panel increases.

In the present invention, by setting the writing area detection section and setting the detected area as the upper bit of the coordinate code, it is possible to simultaneously scan a plurality of detected element points. Since it is a pressure type, it has the advantage of excellent operability, and can be used as a simple input device for inputting figures, characters, etc. into a calculator while writing them down.

[Brief explanation of drawings]

FIG. 1 is a conventional pressure-sensitive handwritten figure input device, FIG. 2 is a block diagram of an input panel according to an embodiment of the present invention, and FIG. 3 is a block diagram of an embodiment of the present invention. 41... Electrode plate for X area detection, 42...
・X-area detection electrode plate, 43 and 46...Pressure-sensitive conductive sheet, 44...X electrode plate, 45...
...X electrode plate, 47...X area counter,
48...X area counter, 49...X
Counter, 50... Y counter, 51...
...Clock pulse generator, 52...X area decoder, 53...Y area decoder, 54...
...X decoder, 55...Y decoder, 56
...Flip-flop, 57 and 58...
. . . AND gate, 59 and 63 . . . Level detector, 60 and 64 . . . Strobe pulse generator, 61 . . .
...X area register, 65...X register, 66...-X register, X□~input...
X conductor group, Y1~Yn...X conductor group, XA□~
XAi...X area detection electrode, YA1 to YAi
......X region detection electrode, R1 and R2...
...Load resistance, E, ...Power supply, 5XA1~5X
A4j 5YA1~5YA4゜SX, ~sx,, syl
, sy, ... changeover switch.

Claims (1)

[Claims] 1 A first conducting wire group consisting of a plurality of narrow conducting wires arranged parallel to each other in a first direction is closely attached to the first surface and arranged parallel to each other in a second direction perpendicular to the first direction. a first pressure-sensitive conductive sheet in which a second conductive wire group consisting of a plurality of narrow conductor wires is in close contact with the second surface; A first planar electrode group consisting of a plurality of planar electrode plates with corresponding widths is closely attached to the first surface and arranged parallel to each other in the second direction, and corresponds to the plurality of conductors of the second conductor group. A second pressure-sensitive conductive sheet in which a second plane electrode group consisting of a plurality of plane electrode plates of a width is closely attached to the second surface, and each plane electrode plate group in the second pressure-sensitive conductive sheet is sequentially selectively removed. The second area in the area corresponding to the scanned and pressurized raw point
means for detecting the upper bits of each of the X code and the Y code at the position of the pressurized raw point by detecting a change in the resistance value of the pressure-sensitive conductive sheet; , the first pressure-sensitive conductor at the pressurized raw point is scanned sequentially and selectively within the small group consisting of a plurality of conducting wires corresponding to the same flat electrode plate, and simultaneously between different small groups, and means for detecting the lower bits of each of the X code and the Y code at the position of the pressurized element point by detecting a change in the resistance value of the sheet, the first pressure-sensitive conductive sheet and the second pressure-sensitive conductive sheet; 1. A pressure-sensitive handwritten figure input device, characterized in that a conductive sheet is laminated with an insulating layer interposed therebetween.