JPS61156328A - Tablet input device - Google Patents

Abstract

PURPOSE:To avoid the wrong inputs by distributing an error detecting lead wire as if it enclosed a signal transmission lead wire and also scanning this lead wire in the same way as the electrode wires in the (x) and (y) directions. CONSTITUTION:The x-direction bit electrode wires 21 and digit electrode wires 22 are provided alternately with the prescribed spaces on the surface side of an insulated substrate 11. While the y-direction bit electrode wires 31 and digit electrode wires 32 are provided alternately with prescribed spaces on the rear surface side of the substrate 11. Thus an electrostatic coupled tablet 1 is obtained. Furthermore an error detection wire 71 for y-bit lead wire surrounds the part where y-bit lead wires 61-1-61-8 pass through and is connected to a terminal 81-39 via through holes 41i and 41j. While an error detection wire 72 for x-bit lead wire surrounds the part where x-bit lead wires 51-1-51-8 pass through. An end of the wire 72 is connected to a terminal 81-13 with the other end 72a connected to a terminal 72b respectively in the form of a loop.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tablet input device, and more particularly to prevention of erroneous inputs related to signal transmission conductors of the tablet.
(Prior Art) In a tablet input device, electrical coupling (electrostatic coupling) is required between each electrode wire in the X direction and the y direction formed on the tablet and a coordinate indicating means such as an input pen that is in contact with the tablet. (or electromagnetic coupling) to identify the coordinates specified at that time. By the way, in addition to the electrode wires in each direction mentioned above, the tablet must be provided with signal transmission wires to connect these to the drive circuit, etc., but conventionally, careful attention has been required to the placement of these wires. There is. this is,
Naturally, the same 5) C pulse signal is flowing through this signal transmission conductor as in each electrode wire, and depending on the arrangement of this signal transmission conductor, it may be outside the input area and may be accidentally touched. This is because there is a possibility that the coordinate indicating means which has been inputted is coupled with these electrode wires and the signal transmission conductive wire, and the coordinate data may be output as if the coordinate indicating means was correctly brought into contact within the input area. .

For this reason, conventional methods have been to cover the area where signal transmission conductors such as the periphery of the tablet are arranged with a frame-shaped casing made of a metal material, or to make the periphery of the tablet sufficiently wide so that each electrode wire and signal transmission conductor can be arranged. 5K to prevent them from being combined with the coordinate indicating means at the same time.

(Problem that the invention aims to solve) For this reason, in conventional tablet input devices, even if a resin casing is used due to aesthetic or cost reasons, it is necessary to provide two alternative shielding means, and the input area There were restrictions such as the need to widen the area around the signal transmission conductor and the electrode wire to distance them.

(Means for solving the problem) Therefore, in the present invention, error detection conductors are arranged so as to surround the signal transmission conductors, and these conductors are also scanned in the same manner as the electrode lines in each of the x and y directions. .

(Function) That is, by doing this, when the signal transmission conductor and the coordinate indicating means are connected, the error detection conductor is also connected to the coordinate indicating means, and the error detection 4! Since a signal related to IK is detected, it can be determined from this that the coordinate instruction at that time is incorrect.

! (Example) The details of the present invention will be explained below based on illustrative examples.

In this embodiment, the present invention is applied to a capacitively coupled tablet input device. In the first WIC, 1 is a tablet, and the front side of an insulating substrate 110 made of glass epoxy resin, etc.
The bit electrode lines 21 and the digit electrode lines 22 in the
), bit electrode lines 51 and digit electrode lines 32 in the y direction are alternately formed at predetermined intervals. There are 46 X-direction bit electrode lines 21 (21-1 to 2l-46) in the X direction.
X-direction bit electrode line signal transmission conducting wires 51-1 on the back surface are formed through through holes 41 every seven wires.
~5l-13 (hereinafter referred to as "X bit conductor") K connection. In addition, there are 46 X-direction digit electrode wires (22-1
~22-46) are formed, and here seven wires are connected in parallel and X direction digit electrode wire signal transmission conductors 52-1 to 52 are formed.
-7 is connected.

The connection of these electrode wires is the same in the y direction, and the y direction bit electrode lines 51-1 to 451-58 are connected every seven through holes 41 to the y direction bit electrode line signal transmission conducting wires 61-1 to 6l. -8 (hereinafter referred to as "y bit conductor")
In addition, seven y-direction digit electrode wires 32-1 to 52-38 are connected in parallel to form a y-direction digit electrode wire signal transmission conductor 62-1.
~62-6) Cll is connected.

Also, 71 is the tamper detection lead for the y bit lead.

It is formed to go around the part where the conductors 61-1 to 61-8 pass (left side in Figure 1), and connects to the terminal 8l-5917C through the through holes 41i and 41j.
It is connected. Furthermore, 72 is X-Bi.

#X bit conductors 51-1 to 51 with error detection conductors for bit conductors
- The part where 8 passes (Figure 1 (Bl v! J side bottom side)
The terminal 81-13 is formed around the terminal 81-13 at one end.
, and the other end 72m is connected to a terminal 72b by a connection wire (not shown).
The signal transmission conductive wires 51, 52, 61 and 62 described above are also connected to any of the terminals 81-1 to 81-40, but detailed explanation will be omitted.

FIG. 2 shows an example of the block configuration. In the figure, 1 is the first t
81-1 to 81-40 are the terminal groups. 101 is a decoder.

The supplied address signal AD is decoded and each terminal 81 is
A scanning pulse SP is applied to -1 to 81-40. 102
is an input pen, and has a built-in pen switch 102B that operates when its detection tip 102A comes into contact with the tablet 1. 105 is an amplifier for detecting light fa102Ai'c
The resulting induced pulse PP is amplified. 104 is an analog-to-digital converter that converts the pulse height of the induced pulse PP into a digital value DD. 105 is an input/output port (hereinafter referred to as “IO”)
It is used for exchanging data between the processing device 106 (hereinafter referred to as rCPUJ) and each processor. C
The PU 106 is composed of a so-called micro combination, and is a read-only system 107 (hereinafter referred to as "ROMJ").
While using the random access memory 108 (hereinafter referred to as "RAMJ") according to the stored program,
Executes predetermined 6-filling, such as specifying designated coordinates.

Next, the operation of this embodiment will be explained. First, when the operator touches the tip 102A of the input pen 102 to desired coordinates on the tablet 1, the pen switch 102B closes and the pen switch signal ps is supplied to the CPU 106i (via l0105. The CPo 106 responds to this signal PSK. First, a scanning pulse S is applied to the X-direction invitation wires 22-1 to 22-46.
P is applied (predetermined address signals AD are sequentially supplied. In this embodiment, these digit electrode lines 22-1 to 22-46 are
Each book is connected in parallel to form seven groups.

Here, each group is displayed in hex in order from "01" to "0".
7" is assigned, CPU1
06 sequentially supplies the address signals AD from "01" to "07J" to the datar 101.The CPU 106 then calculates the digital value DDt' of the induced pulse pp generated when each of the address values "01" to "07" is applied. RAM10
8 in a predetermined area. Similarly, CPU10
6 sequentially for each group of pit electrode lines 21-1 in the X direction to digit electrode lines 31-1 in the 21-46.7 direction to bit electrode lines 52-1 to 52-38 in the 31-38.7 direction. In order to apply the scanning pulse SP, a predetermined address signal AD is sequentially supplied, and the digital value DD of the pulse SP induced at that time is stored in a predetermined location in the RAM 108.

Further, the 1ccPυ 106 supplies a predetermined address signal AD to the decoder 101, and sequentially applies scanning pulses SP to the Y bit conductor error detection conductor 71 and the The digital value DD'4tRAM1 of the induced pulse pp
08 at the specified location.

Next, (pUto6 reads out the digital value DD of each induced pulse PP related to the Y-bit conductor error detection conductor 72 and the X-bit conductor error detection conductor 971 from among the digital values DD stored in this RAM 108. , it is determined whether the value is greater than a predetermined value.

That is, for example, if the input pen 102 is in contact with the normal input canister 5 as shown in P1 of FIG.
The digital value DD of the induced pulse PP according to 2.71 should be sufficiently smaller than the predetermined value. On the other hand, if the input ben 102 is inadvertently brought into contact with, for example, P2 in FIG.
The digital value DD of P should be larger than the predetermined value.

In this judgment step, the above six error detection conductors 7
When the digital value DD of the induced pulse PP related to 2.71 is larger than a predetermined value, the CPU 106 outputs the error signal ED to a combination (not shown) without looking at the other digital values DD.
Send it to the Yurei body.

The combination body makes a warning sound, a warning display, etc. to the operator.

On the other hand, in the above judgment step, the error detection guide $72
．． 71) If the digital value DD of the induced pulse PP related to C is smaller than the predetermined value, the CPU 104 calculates the maximum value of each of the nine groups of digital values of the induced pulse PP related to each electrode line scan. Bit electrode lines 21-1 to 21-46 in the X direction related to the maximum value are selected. Same (digit electrode @22-1~22-46.1 direction bit electrode line 51-1~31-38.Same digit electrode line 32-1~
The address number assigned to each group 52-38 is calculated and sent as tablet address data TD to a combination unit (not shown), a main unit, etc.

In this embodiment, the present invention is applied to a capacitive coupling type tablet input device, but it goes without saying that the present invention can also be applied to other types of tablet input devices such as an electromagnetic coupling type tablet input device.

(Effects) As explained above, according to the present invention, there is no need to worry about the positional relationship between the signal transmission conductor and each electrode wire, or the shielding, and the space around the tablet is eliminated, and the resin casing can also be used freely. can be used.

[Brief explanation of the drawing]

The figure shows an embodiment of the tablet input device of the present invention.
v! j(4) is a plan view of the tablet, FIG. 1 (Bl is a back view of the tablet, and FIG. 2 is a block diagram. 1... Tablet, 51.52.
61.62. ...-Conductor for signal transmission, 71.
72・-・・・・Conductor for error detection. 102---...-, coordinate indicating means, 1 (11
07,108-- Coordinate identification means

Claims (1)

[Claims] A tablet, a coordinate specifying means for instructing desired coordinates by contacting the tablet, and a coordinate specifying means for specifying the coordinates specified by the means, and the tablet has an error detection device in a portion where conductive wires for signal transmission are arranged. A tablet input device comprising a conducting wire, wherein the coordinate specifying means invalidates the coordinate instruction when a signal related to the error detection conducting wire is detected during coordinate specifying.