JP2616912B2 - Coordinate input device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention detects a vibration transmitted to a coordinate input device, in particular, a vibration transmitting member by vibration detecting means provided on the vibration transmitting member, and transmits the vibration. The present invention relates to a coordinate input device for deriving coordinates of a vibration input position to a member.

[Related Art] Conventionally, various coordinate input methods for inputting two-dimensional coordinates in a digitizer tablet or the like have been known. For example, a method of inputting by operating a touch panel using transparent electrodes with a finger or the like, or inputting vibration to the vibration transmission plate with an input pen that generates ultrasonic vibration, and detecting vibration with a vibration sensor attached to the vibration transmission plate Do,
A method of detecting the coordinates of the vibration input point on the vibration transmission plate from the vibration transmission time, or a method that does not use a special input member, such as touching the CRT with a light pen or the like and picking up a high signal of the CRT, is known. Have been.

Further, a device that can use both a special input pen and both a finger and a pencil for input has been considered. Such input is possible with a pressure-sensitive tablet, and CR
A method of attaching a transparent touch panel to the T screen and detecting the light of the CRT by operating the touch panel or using a light pen can also perform such input.

[Problems to be Solved by the Invention] However, in this type of device, it may be necessary to detect what kind of member is used for input depending on the application. It is impossible to make a distinction, and in a device that uses both a CRT and a touch panel, there are problems that the cost of the device increases because both types of coordinate detection mechanisms are provided.

In the coordinate input method using ultrasonic vibration, in addition to the vibration pen, a vibration input may be performed by hitting a desired position on the input surface with a finger or the like to detect the coordinates of the input position. In such a configuration, there is a problem that erroneous detection occurs when an impact is accidentally applied to the input surface, for example, when a wristwatch is worn.

An object of the present invention is to provide a simple and inexpensive configuration that allows accurate coordinate input by a plurality of input means without causing erroneous detection, identifies which input means has been used, and identifies the input means. It is an object of the present invention to provide a coordinate input device capable of reliably performing an appropriate process according to another.

[Means for Solving the Problems] In order to solve the above problems, in the present invention, the vibration transmitted to the vibration transmitting member is detected by vibration detecting means provided on the vibration transmitting member, In a coordinate input device for deriving coordinates of a vibration input position to the vibration transmitting member, a vibration input unit for generating vibration, and the vibration input unit is transmitted to the vibration detecting unit by contacting the vibration transmitting member. A first discriminating means for detecting the first vibration by frequency discrimination, and a second transmitted to the vibration detecting means by hitting the vibration transmitting member with a member different from the vibration input means.
A second discriminating means for detecting the vibration of frequency by frequency discrimination, and calculating an input coordinate value of the vibration and corresponding to the detected output of the first or second discriminating means based on the calculated input coordinate value. Processing means for performing processing to perform the processing, and when one of the first and second discriminating means generates a detection output, the other discrimination means is given priority in transmitting the detection output to the processing means. And a control unit for prohibiting transmission of the output to the processing unit.

[Operation] According to the above configuration, it is possible to perform a process corresponding to what is used for the input member based on the input coordinate value, and in that case, discriminate one of the first and second discriminating means. When the means generates a detection output, the transmission of the output of the other discriminating means to the processing means is prohibited in order to prioritize the transmission of the detection output to the processing means.
Malfunction can be prevented.

EXAMPLES Hereinafter, the present invention will be described in detail based on examples shown in the drawings.

FIG. 1 shows the structure of a coordinate input device employing the present invention. In the figure, reference numeral 1 denotes a vibration transmission plate such as acrylic or glass, which constitutes an input tablet for inputting coordinates by vibration input using a finger F or a vibration pen 2.
A plurality (here, three) of vibration sensors 7 are attached to the vibration transmission plate 1 for detecting vibration.

The user inputs coordinates to a desired position on the vibration transmission plate 1 by hitting the surface of the vibration transmission plate 1 with the finger F or inputting vibration of a predetermined frequency with the vibration pen 2.

The vibrating pen 2 has a vibrator 9 composed of a piezoelectric element or the like for generating vibration, and the vibrator 9 is driven by an oscillator 9 having a predetermined frequency, here 400 KHz. The vibration of the vibrator 9 is transmitted to the vibration transmission plate 1 via the horn 10 at the tip of the vibration pen 2.

The coordinate calculation device 5 sends a signal from the vibration pen 2 to the vibration sensor 7 based on a predetermined waveform detection process of the vibration detection signal of the vibration sensor 7.
The coordinate calculation device 5 that measures the vibration transmission time up to and obtains the coordinates of the vibration input point on the vibration transmission plate 1 includes a phase difference signal processing circuit, a microprocessor element for calculation, and the like.

The coordinate calculation device 5 obtains a linear distance from the vibration input points for the plurality of vibration sensors 7 and calculates a coordinate value from the distance data. Since the signal detected by the vibration sensor 7 has a phase difference according to the distance, the coordinate calculation device 5 obtains a linear distance between the input point and each vibration sensor 7 based on the phase difference.

The coordinate values obtained by the coordinate calculation device 5 are input to a CPU 6 serving as a main control unit and used for various processes. The CPU 6 performs an output process based on the input coordinates on a display device or a recording device (not shown), or performs various processes such as storing the input coordinate data on a magnetic disk or a memory. At this time, if it is necessary to identify the input means of the finger F or the vibration pen 2 according to the processing conditions,
The input means can be identified by examining the outputs of the frequency discriminating circuits indicated by reference numerals 3 and 4.

Each of the frequency discriminating circuits 3 and 4 includes band pass filters 31 and 41 having different passing frequencies and rectifiers 32 and 42 for rectifying the outputs of these band pass filters.
Therefore, the frequency discriminating circuits 3 and 4 form a high-level or low-level signal indicating whether or not the passing frequency component of the band-pass filters 31 and 41 is output from one of the vibration sensors 7. Here, the presence of the frequency component is detected by the high level output. The pass frequency of the band-pass filter 31 is the vibration frequency 400 KH of the vibration pen 2
z, the pass frequency of the band-pass filter 41 is set to a vibration frequency of 1 KHz generated when the vibration transmission plate 1 is hit with the finger F.

Output signals of the frequency discriminating circuits 3 and 4 are input to a logic circuit 11 including an inverter 51 and an AND gate 52. The output of the frequency discrimination circuit 4 is input to the AND gate 52, and the output of the frequency discrimination circuit 3 is input to the AND gate 52 after being inverted by the inverter 51. The output of the AND gate 52 is input to the terminal 61 of the CPU 6 as the output of the logic circuit 11.
The output of the frequency discrimination circuit 3 is directly input to the terminal 62 of the CPU 6.

The terminal 6 is a terminal for detecting an input by the finger F, and the terminal 62 is a terminal for detecting an input by the vibrating pen 2.

In the above configuration, when a coordinate input is performed by hitting a desired position on the vibration transmission plate 1 with the finger F, the vibration sensor 7 outputs a detection signal including a frequency component of 1 KHz. On the other hand, when an input is made by the vibration pen 2, a detection signal including a frequency component of 400 KHz is output from the vibration sensor 7.

Therefore, when an input is made by the vibration pen 2, the band-pass filter 31 of the frequency discrimination circuit 3
The Hz component is passed and rectifier 32 rectifies it to form a high level DC signal. On the other hand, the output of the frequency discriminating circuit 4 is a low-level output because the component of 1 KHz is not included in the output of the vibration sensor 7.

This causes one input of the AND gate 52 of the logic circuit 11 to go low via the inverter 51, so that the terminal 61 of the CPU 6 goes low. On the other hand, the terminal 62 of the CPU 6 receives the high-level signal of the frequency discrimination circuit 3 and goes high.

Conversely, when an input is made with the finger F, the frequency discriminating circuit 4 outputs a high level and the frequency discriminating circuit 3 outputs a low level by the opposite operation to the above, so that the terminal 61 is at a high level and the terminal 62 is at a high level. Low level.

Accordingly, the CPU 6 detects the state of the terminals 61 and 62 when processing the output of the
Alternatively, it is possible to identify whether any input of the vibration pen 2 has been used.

Further, in the configuration of FIG. 1, when there is a simultaneous input between the finger F and the vibration pen 2, the input of the vibration pen is preferentially detected by the terminal 62 by the operation of the logic circuit 11, and the finger input detection of the terminal 61 is performed. Is masked.

In this way, the CPU 6 can handle the input of the vibrating pen 2 in preference to the input of the finger F. For example, the CPU 6 erroneously touches the input surface by touching the wristwatch while drawing with the vibrating pen 2. It is possible to prevent erroneous detection when an impact is given, and it is possible to continually receive input from the vibration pen 2.

In the above configuration, the terminal 61 is a finger input detection terminal, the terminal 62 is a vibration pen input terminal, and no consideration is given to what to input with the finger F and the vibration pen 2. Can be used for any operation such as image input, command input based on selection of coordinate points, etc. When used, a configuration as shown in FIG. 2 can be used.

2, the difference from FIG. 1 is that the connection states of the frequency discriminating circuits 3 and 4 to the logic circuit 11 are just reversed, and the outputs of the frequency discriminating circuit 4 and the logic circuit 11 are various. This is a point input to the terminals 71 and 72 of the CPU 6.

A terminal 71 of the CPU 6 is used for detecting a predetermined control input by the finger F, and a terminal 72 is used for detecting an input of drawing information by the vibrating pen 2.

According to the above-described configuration, if the vibrating pen 2 is used, the terminal 72 becomes high level. Therefore, the CPU 6 determines the line, the point, and the like based on the coordinate information input to the vibration transmitting plate 16 by the vibrating pen 2. And other image information. On the other hand, when the terminal 71 is at the high level, the CPU 6 understands that a predetermined control command has been input by the finger F, and performs image control according to the command.

Commands that can be input with the finger F include image input start,
Various commands can be considered, such as a command indicating the timing of the end and the like, a command for automatically creating an image such as a straight line, a circle, or a polygon centered at a predetermined coordinate, and an image deletion or insertion.

In FIG. 2, since the connection of the logic circuit 11 is reversed from that in FIG. 1, the priority of the vibration pen 2 for image input and the priority of the finger F for control input are opposite to those in FIG. The control input by the finger F has priority over the image input by the vibrating pen 2.
Therefore, for example, if the control input is performed by hitting the input surface with the finger F during the image input, the terminal 71 becomes high level, the input of the terminal 72 is masked, and the control input is output with priority and the CPU 6 Can give priority to the control input.

The above-described assignment of input means to specific information or assignment to control is merely an example, and it goes without saying that various assignments to information input and control other than those described above are conceivable.

[Effects of the Invention] As is clear from the above, according to the present invention, the vibration transmitted to the vibration transmitting member is detected by the vibration output means provided on the vibration transmitting member, and the vibration to the vibration transmitting member is detected. A coordinate input device for deriving coordinates of an input position, comprising: vibration input means for generating vibration; and frequency discrimination of first vibration transmitted to the vibration detection means by contacting the vibration input means with the vibration transmission member. A first discriminating means for detecting the vibration, and a second member transmitted to the vibration detecting means by hitting the vibration transmitting member with a member different from the vibration input means.
A second discriminating means for detecting the vibration of frequency by frequency discrimination, and calculating an input coordinate value of the vibration and corresponding to the detected output of the first or second discriminating means based on the calculated input coordinate value. Processing means for performing processing to perform the processing, and when one of the first and second discriminating means generates a detection output, the other discrimination means is given priority in transmitting the detection output to the processing means. , Which has a control means for prohibiting transmission of the output to the processing means, and performs a corresponding process in accordance with what is used for the input member based on the input coordinate values by a simple and inexpensive configuration. In this case, if one of the first and second discriminating means generates a detection output, the output of the other discrimination means is prioritized in order to prioritize the transmission of the detection output to the processing means. To the above processing means Since so as to prohibit the transfer, it is possible to prevent the malfunction. It is possible to provide an excellent coordinate input device capable of accurately inputting coordinates by an input from the vibration input means and an input by hitting the vibration transmission member, and capable of identifying which method the input was performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a coordinate input device adopting the present invention, and FIG. 2 is an explanatory diagram showing a modification of the configuration of FIG. DESCRIPTION OF SYMBOLS 1 ... Vibration transmission plate 2 ... Vibration pen 3, 4 ... Frequency discrimination circuit 5 ... Coordinate calculation device 6 ... CPU 7 ... Vibration sensor 31, 32 ... Band pass filter

Claims (1)

(57) [Claims] 1. A coordinate input device for detecting vibration transmitted to a vibration transmitting member by vibration detecting means provided on said vibration transmitting member and deriving coordinates of a vibration input position to said vibration transmitting member. A vibration discriminating means for detecting, by frequency discrimination, a first vibration transmitted to the vibration detecting means by contacting the vibration input means with the vibration transmitting member; and the vibration input. A second discriminating means for detecting, by frequency discrimination, a second vibration transmitted to the vibration detecting means by hitting the vibration transmitting member with a member different from the means, and calculating an input coordinate value of the vibration. Processing means for performing corresponding processing in accordance with the detection output of the first and second discriminating means based on the input coordinate value; and one of the first and second discriminating means When the means generates a detection output, control means for inhibiting transmission of the output of the other discriminating means to the processing means in order to give priority to transmission of the detection output to the processing means. Input device.