JPH08185263A - Coordinate input device - Google Patents

Abstract

PURPOSE: To provide a coordinate input device which makes a fast scan without requiring an AD converter and obtains resolution more than the number of input signals and output signals. CONSTITUTION: A coordinate input part has five signal lines for detecting element select signals 5 outputted from a circuit as input signals of detecting elements, the inputs 6 of lateral detecting elements are made common, and A-E are discriminated with the connected detecting element select signals. Further, seven signal lines are arranged for input signals 7 inputted from detecting elements and inputted to the circuit, the outputs 8 of longitudinal detecting elements are made common, and (a)-(g) are discriminated with connected input signals. Longitudinal resolution is 10 and lateral resolution is 21. Four detecting elements become valid corresponding to inputted coordinates 10 and only when the detecting element select signal B or D is validated, a signal is detected as the input signal (a) and (c), thereby specifying input coordinates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate input device,
In particular, the present invention relates to a coordinate input device used in an electronic notebook, an information processing device, or the like.

[0002]

2. Description of the Related Art Conventionally, there are a coordinate input device using a matrix structure and a device using an AD converter. A coordinate input device using a matrix structure has a large number of detecting elements such as key switches and sensors for detecting the designation of coordinates and constitutes an input unit. Then, wiring of a matrix type is performed in which inputs of detection elements in one arbitrary direction are common and outputs of detection elements in a direction orthogonal to the one direction are common. Further, the detection element selection signal is connected to the input of the detection element one to one, and the output of the detection element is connected to the input signal one to one. A specified coordinate is specified from the detection element selection signal in which the detection element selection signal is detected from the input signal and the input signal in which the detection element selection signal is detected. In addition, in Japanese Patent Laid-Open No. 59-194278,
Furthermore, the scanning of each signal is checked from the presence or absence of the previous input and its location.
A coordinate input device has been proposed in which the scanning time is shortened by limiting the scanning range.

Further, in a coordinate input device using an AD converter, two insulating sheets are arranged at a predetermined interval, and surface resistance as electrodes is formed on the surfaces facing each other. The coordinate information pressed from one surface of the insulating sheet in the state where a predetermined voltage is applied to both ends of the sheet resistance is taken out as a voltage signal generated in the sheet resistance to which no voltage is applied, and this voltage signal is A / Coordinates input to the D converter and input from the output of the A / D converter are calculated by a computing device or the like. Incidentally, JP-A-6
JP-A-2-189525 proposes a coordinate input device for improving the accuracy of detected coordinates by inputting both ends of a surface resistance to which a voltage is applied to both ends of a reference voltage of an A / D converter and an analog ground. There is.

[0004]

In the conventional coordinate input device, when the matrix structure is used, the detection element selection signal is the same as the resolution in one direction and the resolution is the same as the resolution in the orthogonal direction. Input signal of
In order to obtain a high resolution, the number of terminals of circuit components such as LSI used increases, the size of the device increases, and the number of components increases. Further, scanning a large number of input / output signals delays the scanning time, which may cause deterioration of operability such as deterioration of response and omission of designated coordinates.

Further, when the AD converter is used to detect the coordinates, the detection element is limited to the switch, and the sensor or the like cannot be used. Therefore, the only item that can be detected is the coordinates. In addition to increasing the number of parts, power consumption, and cost, changes in the resistance value of the wiring and input surface affect the detection coordinates, so it is difficult to make no adjustment for a long time, and local designation was repeated. In this case, the linearity of coordinate detection is lost and it is difficult to secure long-term reliability.

The present invention has been made in order to solve the above-mentioned problems, and there is no adjustment during use, long-term durability, circuit simplification, device miniaturization, the number of parts and power consumption. It is an object of the present invention to provide a coordinate input device capable of reducing the cost, cost, and the like, capable of performing high-speed scanning without requiring an AD converter, and obtaining a resolution degree higher than the number of input signals or detection element selection signals.

[0007]

According to the present invention, the above object is a coordinate input device in which a large number of detection elements each having an input and an output are arranged in a predetermined direction,
The outputs of at least two detection elements adjacent to each other are effective in response to the coordinate input, each input of the plurality of detection elements is connected to each other, and the plurality of detection elements are in phase with each other. The adjacent detection elements are divided into a plurality of groups so that they do not belong to the same group, and the outputs of the detection elements of each group are connected to each other.
This is achieved by the coordinate input device described in.

According to the present invention, the above-mentioned object is a coordinate input device in which a large number of detection elements each having an input and an output are arranged in a predetermined direction, and at least adjacent to each other in response to a coordinate input. The outputs of the two detection elements are configured to be effective, the outputs of the plurality of detection elements are connected to each other, and the plurality of detection elements are such that adjacent detection elements do not belong to the same set. 3. The method according to claim 2, wherein the plurality of groups are divided into a plurality of groups, the inputs of the detection elements of each group are connected to each other, and the apparatus further comprises signal selecting means for sequentially selecting the plurality of groups. This is accomplished by a coordinate input device.

According to the present invention, the aforementioned object is to provide a plurality of input signal lines in which a plurality of detection elements each having an input and an output are parallel to each other and a plurality of output signals parallel to each other orthogonal to the plurality of input signal lines. A coordinate input device arranged on a line, wherein the outputs of at least two detection elements adjacent to each other on the input signal line and the output signal line are effective in response to the coordinate input. The plurality of output signal lines are divided into a plurality of groups so that adjacent output signal lines do not belong to the same group,
The output signal lines of each set are connected to each other, the plurality of input signal lines are divided into a plurality of sets so that adjacent input signal lines do not belong to the same set, and the input signal lines of each set are The coordinate input device according to claim 3, further comprising signal selection means that are connected to each other and that sequentially select the plurality of sets of input signal lines.

[0010]

In the coordinate input device according to the first aspect, the outputs of at least two detection elements adjacent to each other are effective in response to the coordinate input. The inputs of the detection elements are connected to each other, and the detection elements are divided into a plurality of sets so that adjacent detection elements do not belong to the same set, and the outputs of the detection elements of each set are connected to each other. As a result, the combination of signals output from two adjacent detection elements differs depending on the specified position. Therefore, when two adjacent detection elements are both detecting coordinate input, they are output from them. The input coordinates are specified from the combination of the existing signals. As a result, it is possible to obtain a larger decomposition frequency from a smaller number of output signals than the number of detection elements.

In the coordinate input device according to the second aspect, the outputs of at least two detection elements adjacent to each other are effective in response to the coordinate input. The outputs of the detection elements are connected to each other, and the detection elements are divided into a plurality of sets so that adjacent detection elements do not belong to the same set, and the inputs of the detection elements of each set are connected to each other. In addition, since the signal selection means for sequentially selecting a plurality of groups is provided, the combination of signals input to two adjacent detection elements differs depending on the designated position.
When the two detection elements are both detecting the input of the coordinate, the signal selecting means identifies the combination from the output and specifies the input coordinate. This makes it possible to obtain a higher decomposition frequency from a smaller number of input signals than the number of detection elements.

In the coordinate input device according to the third aspect of the invention, at least two detection elements adjacent to each other on the input signal line and the output signal line are effective in response to the coordinate input. The output signal lines are divided into multiple sets so that adjacent output signal lines do not belong to the same set, the output signal lines of each set are connected to each other, and the input signal lines are adjacent input signals. The lines are divided into a plurality of groups so that they do not belong to the same group, the input signal lines of each group are connected to each other, and a signal selecting means for sequentially selecting the plurality of groups of input signal lines is provided. The combination of the signals output from the two adjacent detection elements and the combination of the signals input to the two adjacent detection elements differ depending on the specified position. The input coordinates are specified based on the combination of the output signals and the combination of the input signal lines when the set selected by the signal selecting means is valid. As a result, it becomes possible to obtain a higher decomposition frequency from a smaller number of input signal lines and output signal lines than the number of detection elements arranged in the corresponding direction.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the coordinate input device of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the portable information processing apparatus to which the coordinate input device of this embodiment can be applied has a coordinate input section 1 as an input means for inputting coordinates, and the input section 1
Is arranged so as to cover the surface of the display unit 2, and is composed of a switch including a transparent base material and a transparent electrode.
The display unit 2 for displaying information is composed of an LCD or the like.

As shown in FIG. 2, the portable information processing apparatus of this embodiment is provided with a reset switch 3 for resetting when the apparatus is in an abnormal state on the back side thereof, and It has a storage portion for storing a battery serving as a power source, and the storage portion is covered with a battery lid 4.

As shown in FIG. 3, the coordinate input unit 1 is connected to each input of the detection elements at the coordinate positions arranged in the vertical direction, and the detection element selection signal 5 output from the CPU circuit is output.
5 are assigned as A to E. Reference numeral 6 denotes an input of the detection elements, the detection elements arranged in the horizontal direction are common, the resolution in the vertical direction is 10, and A to E are distinguished by the connected detection element selection signal. . Further, seven input signals A to A are assigned as input signals 7 output from each of the detection elements at the coordinate positions arranged in the horizontal direction and input to the CPU circuit. Reference numeral 8 indicates the output of the detection element. The detection elements in the vertical direction are common to each other, and the resolution in the horizontal direction is 21, and A to A are distinguished by the connected input signal. Reference numeral 9 indicates one point which is the origin of all the coordinates, and the coordinates obtained when the coordinates are calculated using FIGS. 9 and 10 are (0, 0).
Becomes Reference numeral 10 is an arbitrary point in all coordinates, and when this point is designated, signals are detected as the input signals a and c only when the detection element selection signal B or D is validated.

Next, the control system of the portable information processing apparatus of this embodiment will be described with reference to FIG.

The control system of this embodiment has a CPU 11 for performing operation, calculation and control as signal selecting means,
Connected to the CPU 11 is a RAM 12 used as a work area for reading and writing memory contents. Also, C
ROM 1 for storing programs and the like in the PU 11
3, an LCD 14 for displaying stored contents and processing contents, and an input unit 15 such as a tablet for inputting coordinates are connected.

FIG. 5 is a diagram showing the correspondence between the decomposition frequency and the number of control signals (detection element selection signal and input signal) obtained in this embodiment. The decomposition frequency can be calculated by the following equation, only when the number of signal lines is odd.

Number of signal lines × (number of signal lines-1) / 2 If the number of signal lines is an even number, it is impossible to arrange all the combinations in succession. It will be slightly less than the result.

Next, the operation of obtaining the coordinate position in the lateral direction in this embodiment will be described with reference to the flowchart of FIG.

First, the work areas 1 to 1 in the RAM 12
0 is initialized and the state of the input unit 15 is read (step 1). The validity of the signals from the input signal A to the key of FIG. 3 is confirmed in order, and the signals are stored in the work areas 1 to 7 in order from the first valid signal (step 2). Then, it is determined whether the work area 2 is in the initialized state or the data indicating the signal (step 3), and when it is determined that the work area 2 is in the initialized state, it is determined that the coordinate designation is not performed. The processing is ended (step 4). Further, when it is determined that the work area 2 is data indicating a signal, it is determined whether the work area 4 is data indicating a signal or an initialized state (step 5), and the work area 4 is data indicating a signal. If it is determined that there is no coordinate designation, the process ends (step 6). Also, work area 4
When it is determined that is the initialized state, the coordinate values calculated from the contents of the work areas 1 and 2 using the conversion table shown in FIG. 9 are stored in the work area 8 (step 7). .

Next, it is judged whether the data indicating the signal or the initialized state of the work area 3 (step 8),
When it is determined that the work area 3 is in the initialized state, it is determined that the coordinates are not designated, and the process ends (step 9). When the work area 3 is determined to be data indicating a signal, the coordinate values calculated from the contents of the work area 1 and the work area 3 using the conversion table shown in FIG. 9 are stored in the work area 9. (Step 10). Further, the coordinate values calculated from the contents of work areas 2 and 3 using the conversion table shown in FIG. 9 are stored in work area 10 (step 11).
And the value of work area 8 is work area 8 to 10
Is determined to be the maximum value or the minimum value (step 12), and if it is determined that the value in work area 8 is neither the maximum value nor the minimum value, the value in work area 8 is designated. The process ends as (step 13). Also,
When it is determined that the value of the work area 8 is the maximum value or the minimum value, it is determined whether the value of the work area 9 is the maximum value or the minimum value among the values of the work areas 8 to 10 (step 14) If it is determined that the value of the work area 9 is neither the maximum value nor the minimum value, the process ends with the value of the work area 9 as the designated coordinate (step 1).
5). If it is determined that the value of the work area 9 is the maximum value or the minimum value, the process ends with the value of the work area 10 as the designated coordinate (step 16).

The operation of obtaining the coordinate position in the vertical direction in this embodiment will be described below with reference to the flowchart of FIG.

First, the work areas 1 to 10 are initialized (step 21). The validity of the signals from A to E of the detection element selection signal of FIG. 3 is confirmed in order, and the input signals are stored in the work areas 1 to 5 in order from the valid signal (step 22). Then, it is determined whether the work area 2 is in an initialized state or data indicating a signal (step 23), and when it is determined that the work area 2 is in an initialized state, it is determined that there is no coordinate designation. The processing is finished (step 24). When it is determined that the work area 2 is data indicating a signal, it is determined whether the work area 4 is data indicating a signal or in an initialized state (step 25), and the work area 4 is data indicating a signal. If it is determined that there is no coordinate designation, the process ends (step 26). When it is determined that the work area 4 is in the initialized state, the coordinate values calculated from the contents of the work area 1 and the work area 2 are stored in the work area 8 using the conversion table shown in FIG. (Step 27).

Then, it is judged whether the work area 3 is data indicating a signal or in an initialized state (step 28),
When it is determined that the work area 3 is in the initialized state, the processing is ended with the work area 8 as the designated coordinate (step 29). If the work area 3 is determined to be data indicating a signal, the coordinate values calculated from the contents of the work area 1 and the work area 3 using the conversion table shown in FIG. 10 are stored in the work area 9. (Step 30). Further, the coordinate values calculated from the contents of the work areas 2 and 3 using the conversion table shown in FIG. 10 are stored in the work area 10 (step 31). Then, it is judged whether the value of the work area 8 is the maximum value or the minimum value between the values of the work area and 8 to 10 (step 32), and the value of the work area 8 is neither the maximum value nor the minimum value. If judged, work area 8
The process ends with the specified value as the designated coordinate (step 3).
3). Further, when it is determined that the value of the work area 8 is the maximum value or the minimum value, it is determined whether the value of the work area 9 is the maximum value or the minimum value among the values of the work areas 8 to 10. (Step 34) If it is determined that the value of the work area 9 is neither the maximum value nor the minimum value, the process ends with the value of the work area 9 as the designated coordinate (step 35). If it is determined that the value of the work area 9 is the maximum value or the minimum value, the process ends with the value of the work area 10 as the designated coordinate (step 3).
6).

The operation of obtaining the two-dimensional coordinate values in this embodiment will be described below with reference to the flowchart of FIG.

The work area 11 is initialized, all the detection element selection signals are validated, and the routine of FIG. 6 is executed (step 41). Then, the coordinate designation status by the input signal is confirmed (step 42), and if the coordinate designation status confirmation result is no or invalid, the result is null or invalid and the process ends (step 43). If it is determined that the coordinate designation status confirmation result indicates that the designated coordinate exists, the result is stored in the work area 11 and the routine of FIG. 7 is executed (step 44). Furthermore, the coordinate designation status by the detection element selection signal is confirmed (step 45). If the coordinate designation status confirmation result is none or invalid, the result is null or invalid and the process ends (step 46).
If the coordinate designation status confirmation result is determined to have the designated coordinate, the result is set to the vertical coordinate, the content of the work area 11 is set to the horizontal coordinate, and the process is ended (step 47). .

[0029]

According to the coordinate input device of the first aspect, it is possible to obtain a higher decomposition frequency with a smaller number of output signals. As a result, there is no adjustment during use, long-term durability, simplification of the circuit, downsizing of the device, reduction of the number of parts, power consumption and cost, etc., and high speed scanning is performed without the need for an AD converter. be able to.

According to the coordinate input device of the second aspect, it is possible to obtain a larger decomposition frequency with a smaller number of input signals. As a result, there is no adjustment during use, long-term durability, simplification of the circuit, downsizing of the device, reduction of the number of parts, power consumption and cost, etc., and high speed scanning is performed without the need for an AD converter. be able to.

According to the coordinate input device of the third aspect, it is possible to obtain a resolution higher than the number of input signals and output signals. As a result, there is no adjustment during use, long-term durability, simplification of the circuit, downsizing of the device, reduction of the number of parts, power consumption and cost, etc., and high speed scanning is performed without the need for an AD converter. be able to.

[Brief description of drawings]

FIG. 1 is a front view of a portable information processing device to which a coordinate input device of the present invention is applied.

FIG. 2 is a rear view of the portable information processing device of FIG.

FIG. 3 is a schematic diagram showing a configuration of an embodiment of a coordinate input device of the present invention.

FIG. 4 is a block diagram showing a control system of the portable information processing device of FIG.

5 is a diagram showing the correspondence between the resolution and the number of control signals in the embodiment of FIG.

FIG. 6 is a flowchart showing an operation of obtaining designated coordinates in the horizontal direction in the embodiment of FIG.

FIG. 7 is a flowchart showing an operation of obtaining designated coordinates in the vertical direction in the embodiment of FIG.

8 is a flowchart showing an operation for obtaining two-dimensional coordinates in the embodiment of FIG.

FIG. 9 is a diagram showing a conversion table used for horizontal coordinate position calculation.

FIG. 10 is a diagram showing a conversion table used for calculating a vertical coordinate position.

[Explanation of symbols]

 1 Input section 2 Display section 3 Reset switch 11 CPU 12 RAM 13 ROM 14 LCD 15 Input section

Claims (3)

[Claims] 1. A coordinate input device in which a large number of detection elements each having an input and an output are arranged in a predetermined direction, and the outputs of at least two detection elements adjacent to each other in response to the coordinate input are valid. The input of each of the plurality of detection elements is connected to each other, and the plurality of detection elements are divided into a plurality of groups so that adjacent detection elements do not belong to the same group. And a coordinate input device in which the outputs of the detection elements of each set are connected to each other. 2. A coordinate input device in which a large number of detection elements each having an input and an output are arranged in a predetermined direction, and the outputs of at least two detection elements adjacent to each other in response to the coordinate input are valid. The plurality of detection elements are connected to each other, and the plurality of detection elements are divided into a plurality of groups so that adjacent detection elements do not belong to the same group. The coordinate input device is characterized in that the inputs of the detection elements of each set are connected to each other, and further comprises signal selection means for sequentially selecting the plurality of sets. 3. A coordinate input device in which a large number of detection elements each having an input and an output are arranged on a plurality of parallel input signal lines and on a plurality of parallel output signal lines orthogonal to the plurality of input signal lines. In addition, the outputs of at least two detection elements adjacent to each other on the input signal line and the output signal line are configured to be effective in response to the coordinate input, and the plurality of output signal lines are , The output signal lines adjacent to each other are divided into a plurality of sets so that they do not belong to the same set, the output signal lines of each set are connected to each other, and the plurality of input signal lines are input signal lines adjacent to each other. Are divided into a plurality of groups so that they do not belong to the same group, the input signal lines of each group are connected to each other, and a signal selecting means for sequentially selecting the input signal lines of the plurality of groups is provided. When Coordinate input device.