JP2002373053A - Device and method for inputting coordinates - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a touch panel function and a writing function on a screen and the rear face with a simple configuration by enabling coordinates input on the screen and the rear face of a portable terminal concerning a coordinate input device and a coordinate inputting method for inputting coordinates on the screen or the rear face. SOLUTION: These coordinate input device and coordinate inputting method are provided with an ultrasonic receiver or an ultrasonic transmitter disposed on a side, at a corner or in the vicinity of the screen or the rear face, a pen for transmitting or receiving an ultrasonic wave at the time of instructing or writing coordinates input at an optional position on the screen or rear face, and a means for transmitting or receiving an ultrasonic wave between the pen and the ultrasonic receiver or the ultrasonic transmitter and detecting the 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 and a coordinate input method for inputting coordinates on a screen or a back surface.

[0002]

2. Description of the Related Art Conventionally, a touch panel for directly designating a computer screen with a finger or a pen is intuitive. Therefore, a resistive film is applied and a method of detecting pressing by a finger or a pen is used. A method to detect the change in capacitance due to contact, a method to detect the interruption of light by a finger or pen through infrared rays parallel to the screen, a method to transmit the surface acoustic wave of ultrasonic waves to the screen and detect the interruption of the elastic wave by the finger or pen And other methods have been put to practical use.

On the other hand, even if personal computers are widely used, handwriting is easy for memos and the like, and handwriting input is very convenient especially for memos including figures. Such handwritten memos are also conveniently digitized when they are arranged by themselves or distributed to others. Therefore, there is a method of directly inputting a handwritten memo to a computer using a touch panel, or a method of writing on paper for the time being and then taking the paper into the computer by a scanner or the like. However, handwriting input on the screen of a computer is inferior to writing on paper because the screen resolution is low, the screen is difficult to see, and the writing quality of a pen is poor. On the other hand, it is cumbersome to take in the image later with the scanner. In view of this, a method has been proposed in which paper is placed on a tablet capable of inputting coordinates, and writing is performed on the paper with a writable tablet pen having a ball-point pen core, and at the same time, a pen locus is electronically input by a tablet function. In addition, there are many cases where such usage is desired to be performed in a mobile environment outside the office. For this purpose, there is a product of a portable tablet including a battery, a CPU, a memory, and the like.

[0004]

However, in the above-described apparatus and method of the conventional system, in the mobile environment or the like, the coordinates can be easily input on the screen of a personal PC or the coordinates can be input while writing on paper. And it is also difficult to perform such operations easily.

[0005] The present invention solves these problems,
It is an object of the present invention to enable a coordinate input on a screen and a back surface of a mobile terminal, and to realize a touch panel function and a writing function on the screen and the back surface with a simple configuration.

[0006]

Means for solving the problem will be described with reference to FIG. In FIG. 1, terminal 1
Is a portable terminal such as a personal PC (personal personal computer). When opened, a screen 15 appears on the left side, and when closed, a back face 16 appears on the right side. When drawing directly with the pen 4 according to the present invention or drawing on paper, the ultrasonic wave and light transmitted from the pen 4 are received by the ultrasonic receiver 2 and the infrared PD 3, and at that time, It is used to input coordinates, and includes an ultrasonic receiver 2, an infrared PD 3, and the like.

The ultrasonic receiver 2 is arranged around the screen 15 or the rear surface 16. When the screen 15 is opened, the ultrasonic receiver 2 protrudes, the reflection plate protrudes or moves, and the ultrasonic wave is transmitted from the pen 4. It receives ultrasonic waves.

[0008] The infrared PD 3 detects infrared rays emitted from the pen 4. The pen 4 presses the screen 15, writes when placing paper, and transmits ultrasonic waves and light when the pressing or writing is performed.

The screen 15 is a screen for displaying various images. The back surface 16 is a back surface of the screen 15 that appears when the screen 15 is closed. Next, the operation will be described.

When a coordinate input is instructed or written at an arbitrary position on the screen 15 or the back surface 16 with the pen 4,
The ultrasonic receiver 2 receives the ultrasonic waves transmitted from the pen 4 and detects the coordinates based on the ultrasonic signals detected by means (not shown).

At this time, the pen 4 emits an ultrasonic wave and an infrared ray, receives the ultrasonic waves transmitted from the ultrasonic receivers 2 arranged at two different places, respectively, and receives the infrared rays from the infrared PD 3 provided separately. Is detected and infrared PD3
The time differences up to the time at which the ultrasonic wave is received are calculated from the time detected in step (1), and the coordinates on the screen 15 or the back surface 16 are calculated based on the obtained two time differences.

The ultrasonic receiver 2 is formed of a cylindrical piezoelectric film. Also,
When the screen 15 is opened, the ultrasonic receiver 2 or the reflection plate is projected or moved to detect the ultrasonic waves transmitted from the pen 4 on the screen 15.

The ultrasonic receiver 2 or the reflecting plate is projected or moved when a coordinate input operation is performed from the rear surface 16 to detect the ultrasonic wave transmitted from the pen 4 on the rear surface 16.

Further, a mechanism for fixing the paper on the screen 15 or the back surface 16 is provided so that the coordinates written when the pen 4 is writable on the paper are sequentially calculated. Therefore, it is possible to input coordinates on the screen 15 and the back surface 16 of the terminal 1, and to realize the touch panel function and the writing function on the screen 15 and the back surface 16 with a simple configuration.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments and operations of the present invention will be sequentially described in detail with reference to FIGS.

FIG. 1 is a block diagram showing one embodiment of the present invention.
FIG. 1A shows an example when a touch panel is used. In FIG. 1A, a terminal 1 is a portable terminal such as a personal PC, and when opened, a screen 15 appears as shown, and when closed, a back surface 16 appears as shown in FIG. 1B. When drawing directly on the screen 15 or the back surface 16 with the pen 4 according to the present invention or drawing on paper, the ultrasonic wave and light transmitted from the pen 4 are transmitted to the ultrasonic receiver. 2 and the infrared PD3, and inputs the coordinates at that time, and comprises the ultrasonic receiver 2, the infrared PD3, and the like.

The ultrasonic receiver (1) 2 and the ultrasonic receiver (2) 2 are arranged around the screen 15 or the back surface 16 (for example, as shown in the upper left and upper right of the screen 15). So, when you open the screen 15, it protrudes,
The reflecting plate protrudes or moves, and receives the ultrasonic wave transmitted from the pen 4.

The infrared PD 3 detects infrared rays emitted from the pen 4. The screen 15 is a screen for displaying various images. The pen 4 presses the screen 15, writes when placing paper, and transmits ultrasonic waves and light when the pressing or writing is performed.

The pen holder 5 houses the pen 4. Next, the operation of FIG. 1A will be described. (1) When the screen 15 of the terminal 1 is opened, as shown in the figure, the ultrasonic receiver (1) 2, the ultrasonic receiver (2) 2, and the infrared PD 3 project to the upper left and upper right of the screen 15, respectively. By moving or projecting the reflector, the ultrasonic wave or the infrared ray emitted from the pen 4 can be detected.

(2) In the state of (1), the screen 1 is
When the user presses or draws the image on the pen 5, ultrasonic waves and infrared rays are transmitted from the tip of the pen 4. (3) The ultrasonic wave transmitted in (2) is detected by the ultrasonic receiver (1) 2 and the ultrasonic receiver (2) 2 arranged at the upper left and upper right of the screen 15, respectively, and the transmitted infrared light is transmitted. Is detected by the infrared PD 3 arranged at the upper left of the screen 15 here.

(4) Based on the infrared time detected in (3), time differences T1 and T2 up to the detected ultrasonic wave are calculated, and the pen 4 is calculated based on the time differences T1 and T2. Is calculated (described later with reference to FIGS. 6 and 7).

(5) Then, (1) to (4) are repeated at predetermined time intervals, and the designated position or the drawn position (coordinate) is sequentially read by the pen 4. As described above, the screen 15 of the terminal 1 is opened and the screen 15
When a position is indicated or drawn directly with the pen 4 above, the coordinates of the tip of the pen 4 can be sequentially detected.

FIG. 1B shows an example at the time of writing on paper. This shows the back 16 of the screen when the screen 15 of the terminal 1 in FIG. 1B is closed. In FIG. 1B, the ultrasonic receiver (1) 2 and the ultrasonic receiver (2) 2
The ultrasonic receiver (1) 2 receives the ultrasonic wave radiated from the ultrasonic receiver (1) 2 when the screen 15 of FIG. The ultrasonic wave receiver (2) 2 can be made to protrude or move, or the reflector can be made to protrude so that ultrasonic waves can be received.

The infrared PD 3 receives infrared rays radiated from the pen 4 and has a screen 15 shown in FIG.
Is closed and a rear input instruction operation (not shown) is performed,
The infrared PD 3 can be received or moved by projecting or moving the infrared PD 3 or projecting the reflection plate.

The paper 6 is placed on the back surface 16 and written with the pen 4, and is used for sequentially reading the coordinates of each point when the writing is performed. The paper shears 18 are for fixing the paper 6 to the back surface 16.

Next, the operation of FIG. 1B will be described. (1) When the screen 15 of the terminal 1 is closed and the back side input instruction operation is performed, as shown in the figure, the ultrasonic receivers (1) 2, (2) 2, and The infrared PDs 3 protrude, move, or protrude with the reflector, respectively, so that the ultrasonic waves or infrared rays emitted from the pen 4 can be detected.

(2) In the state of (1), the pen 1 is
When the paper 6 is placed on the paper 6 and pressed or drawn, ultrasonic waves and infrared rays are transmitted from the tip of the pen 4. (3) The ultrasonic wave transmitted in (2) is detected by the ultrasonic receiver (1) 2 and the ultrasonic receiver (2) 2 arranged on the upper left and upper right of the back surface 16, respectively, and the transmitted infrared light Is detected by the infrared PD 3 arranged at the position shown in the figure on the back surface 16.

(4) Based on the infrared time detected in (3), the time differences T1 and T2 to the detected ultrasonic wave are calculated, respectively, and the pen 4 is calculated based on the time differences T1 and T2. Is calculated (described later with reference to FIGS. 6 and 7).

(5) Then, (1) to (4) are repeated at predetermined time intervals, and the designated position or drawn position (coordinates) is sequentially read by the pen 4. As described above, with the screen 15 of the terminal 1 closed and the back face 16 appearing, the paper 6 is placed on the back face 16 and the pen 4 is directly placed.
It is possible to sequentially detect the coordinates of the tip of the pen 4 when indicating or drawing a position with. The details will be sequentially described below.

FIG. 2 shows a pen configuration diagram of the present invention. FIG.
(A) of FIG. In FIG. 2A, a pen 4 is the pen 4 of FIG. 1 described above and has a configuration as shown.

The ball-point pen core 40 is a core of a ball-point pen, which is used when drawing paper with the paper placed on the screen 15 or the back surface 16. It is in a state where writing is impossible.

The ultrasonic transmitter 2 transmits ultrasonic waves to the surroundings when pressed or written, and is a cylindrical piezoelectric film. The piezoelectric film is a piezoelectric film made of, for example, polyvinylidene fluoride, and transmits an ultrasonic wave around a cylindrical shape (360 °) when a high voltage (for example, 500 V) having an ultrasonic frequency (for example, 40 KHz) is applied. is there.

The infrared LED 41 emits infrared light, and here, for example, three LEDs that emit infrared light around 120 ° are arranged so as to emit light in 360 ° direction.

The contact detection switch 42 is a ball-point pen core 4
It operates and detects when 0 touches the paper placed on the screen 15 or the back surface 16. Drive circuit 4
Reference numeral 3 is for driving the infrared LED 41 and the ultrasonic transmitter 2 to transmit infrared and ultrasonic waves.

The rechargeable battery 44 is a rechargeable battery that supplies power to the drive circuit 43 and the like. The holder contact electrode 45 is an electrode for charging when the rechargeable battery 44 is stored in the pen holder 5 in the terminal 1 in FIG.

FIG. 2B shows an example of an internal block diagram of the pen. This shows an example of an internal block diagram of the pen 4 in FIG. In FIG. 2B, the contact detection switch 42 is the contact detection switch 42 of FIG. 2A and detects that the ballpoint pen core 40 has been pressed.

The drive circuit 43 is the drive circuit 43 shown in FIG. 2A, and includes a timer 51, an ultrasonic drive circuit 52, an LED drive circuit 53 and the like as shown.

When the touch detection switch 42 detects that the touch switch 42 has been pressed, the timer 51 outputs a drive signal at regular intervals (for example, 100 Hz) to the ultrasonic drive circuit 52 and the LED drive
3.

The ultrasonic drive circuit 52 generates a pulse voltage based on a signal from the timer 51 and supplies the pulse voltage to the ultrasonic transmitter 2 to transmit an ultrasonic pulse. The LED drive circuit 53 generates a pulse voltage based on a signal from the timer 51 and supplies the pulse voltage to the infrared LED 3 to transmit an infrared pulse.

With the above circuit configuration, when the contact detection switch 42 of the pen 4 detects that the ball-point pen core 40 has been pressed or written on the paper, the timer 51 generates a pulse signal of a fixed period, The ultrasonic wave driving circuit 52 and the LED driving circuit 53
By driving the ED 3, it becomes possible to sequentially transmit an ultrasonic pulse and an infrared pulse.

FIG. 3 shows an example of the function of inserting and removing a pen core according to the present invention. This shows an example of a mechanism in which the switching lever 46 provided beside the pen 4 is shifted downward to eject the ballpoint pen core 40, or shifted upward to insert the ballpoint pen core 40.

FIG. 3A shows a state in which the core is protruded. In this state, the ball-point pen core 40 protrudes from the lower end, and when writing is performed on the paper placed on the screen 15 or the back surface 16 with the ball-point pen core 40, the ball-point pen core 40 is pressed and the contact detection switch (1) is pressed. ) 42.

With the above configuration, when the ball-point pen core 40 protrudes from the tip of the pen 4, the pressure when the ball-point pen core 40 draws on the paper is detected by the contact detection switch (1) 42, As described above, the ultrasonic pulse and the infrared pulse can be transmitted from the pen 4.

FIG. 3B shows a state where the core is inserted. In this state, the ballpoint pen core 40 does not protrude from the lower end, and the contact detection switch (2) 42 disposed around the hole at the tip detects that the ballpoint pen is pressed or written on the screen 15 or the back surface 16.

With the above configuration, when the ballpoint pen core 40 is inserted from the tip of the pen 4, pressing or writing is detected by the contact detection switch (2) 42 arranged at the hole at the tip of the pen 4, As described above, the ultrasonic pulse and the infrared pulse can be transmitted from the pen 4.

FIG. 4A shows an example in which the sensor holder (1) 7 and the sensor holder (2) 7 are arranged at the terminal.
In FIG. 4A, the display panel 8 is the display panel 8 provided in the terminal 1 and corresponds to the screen 15.

The liquid crystal display 9 is a part of the liquid crystal display 9 arranged on the display panel 8 for actually displaying images and the like. As shown in FIGS. 4B to 4D, the sensor holder (1) 7 and the sensor holder (2) 7 are portions that store the sensor holder 7 that stores the sensor 10.

FIG. 4B shows the state of the sensor holder 7 when it is not used. When not used, the liquid crystal display surface 11 and the display back surface 12 are stored so as to fit exactly in the thickness portion. In this state, the sensor 10 mounted on the sensor holder 7 is connected to the liquid crystal display surface (corresponding to the screen 15) 11 or the display back surface (back surface 16).
12), the pen 4 does not protrude on the liquid crystal display surface 11 or the display back surface 12.
Is pressed and the ultrasonic wave and the infrared ray are transmitted, none of them is detected, and it is not used.

FIG. 4C shows the liquid crystal display surface 11.
3 shows the state of the sensor holder 7 when used. When used on the liquid crystal display surface 11, the sensor holder 7 protrudes from the liquid crystal display surface 11 side as shown in the drawing, and the sensor 10 comes to a position where the pen 4 can be seen. In this state, when the sensor 10 mounted on the sensor holder 7 presses the pen 4 on the liquid crystal display surface (corresponding to the screen 15) 11 to transmit ultrasonic waves and infrared rays, the sensors (the ultrasonic receiver 2 and the infrared ray It becomes possible to input the coordinates detected by the PD 3) 10.

FIG. 4D shows the state of the sensor holder 7 when used on the display back surface 12. When used on the display back 12, the sensor holder 7 protrudes from the display back 12 as shown in FIG.
0 comes to a position where pen 4 can be seen. In this state, when the sensor 10 mounted on the sensor holder 7 pushes the pen 4 on the display rear surface (corresponding to the rear surface 16) 12 to transmit ultrasonic waves and infrared rays, these are transmitted to the sensors (the ultrasonic receiver 2 and the infrared PD 3). ) It is possible to detect at 10 and input the coordinates.

FIG. 5 is a block diagram showing a receiving circuit according to the present invention. That is, based on the ultrasonic signal and the infrared signal received by the ultrasonic receiving circuit 2 and the infrared PD 3, the difference times T1 and T2 from the time of the infrared signal to the time of the two ultrasonic signals are calculated based on the time of the infrared signal. 2 shows an example of a circuit.

The infrared PD 3 detects infrared rays for synchronization emitted from the pen 4. The ultrasonic receivers (1) and (2) detect the ultrasonic waves radiated from the pen 4, respectively.

Next, the operation will be described. (1) An infrared pulse emitted from the pen 4 is detected by the infrared PD 3, and a timer (1) is
(2) Start (start time measurement) (see FIG. 6 described later).
Of the received waves 1 and 2 is started).

(2) The ultrasonic receiver (1) receives the ultrasonic pulse transmitted from the pen 4 at the same time as the infrared pulse, amplifies the signal with the input amplifier (1), and a predetermined value with the comparator (1). When rt1 is exceeded, 1 is set to FF (1)
And the set value 1 is input to the AND circuit, while the zero-cross comparator (1) sets the predetermined value rt1
The zero cross comparator (1) inputs 1 to the AND circuit at the next zero cross beyond the limit, and as a result, the Stop signal at the time of the next zero cross after the reception wave 1 of FIG. Is output to the timer (1), and the difference time T1 is measured.

(3) Similarly to (2), based on the ultrasonic signal from the ultrasonic receiver (2), a difference time T2 of the received wave 2 shown in FIG. 6 described later is measured. (4) The microcontroller having received the notification of T1 of (2) and T2 of (3) is based on the principle of the triangulation of FIG. ) Is calculated.

As described above, based on the signal from the infrared PD 3, the ultrasonic receiver (1) and the ultrasonic receiver (2)
It is possible to measure the difference times T1 and T2 until the respective signals arrive from and to calculate the coordinates of the pen 4 based on these T1 and T2.

FIG. 6 shows an example of a timing chart of the reception signal of the present invention. In FIG. 6, the infrared synchronization signal is a signal obtained by receiving the infrared pulse emitted from the pen 4 by the infrared PD 3.

The received wave 1 is a signal radiated from the pen 4 and received by the ultrasonic receiver (1). T1 in the figure is
Based on the infrared synchronization signal, the amplitude of the received wave 1 is set to a predetermined value rt.
The difference time until the next zero crossing point exceeding 1 is measured by the circuit of FIG. 5 described above.

The received wave 2 is a signal radiated from the pen 4 and received by the ultrasonic receiver (2). T2 in the figure is
Based on the infrared synchronization signal, the amplitude of the received wave 2 is set to a predetermined value rt.
The time until the next zero crossing point exceeding 2 is shown in FIG.
Is measured by the circuit of FIG.

FIG. 7 is an explanatory diagram of the present invention. FIG. 7A shows an example of a configuration for measuring an arrival time by the ultrasonic receiver 2. This means that the ultrasonic receiver 2 receives the ultrasonic pulse radiated from the pen 4 and amplifies it with the input amplifier 13.
The arrival time detection circuit 14 (the circuit of FIG. 5 described above) uses T (T
1, (T2) is schematically displayed in an easily understandable manner.

FIG. 7B is a schematic diagram showing a state in which the coordinates of the pen 4 are calculated based on T (T1, T2 in FIG. 6 described above) measured in FIG. 7A. It is displayed in an easily understandable manner. Where P (x, y) is the pen coordinates,
R1 (0,0) is the coordinates of the ultrasonic receiver (1),
2 (W, 0) is the coordinates of the ultrasonic receiver (2). Here, T1 is a time corresponding to the distance L1 from P (x, y) to the ultrasonic receiver (1).

T2 is the time corresponding to the distance L2 from P (x, y) to the ultrasonic receiver (2). Now, the sound speed is V, the distance between the ultrasonic receiver (1) and the ultrasonic receiver (2) is W, the distance from the pen 4 to the ultrasonic receiver (1) is L1, and the ultrasonic wave from the pen 4 is The distance to the receiver (2) is L
When 2, L1 = a V × T1 L2 = V × T2 R1 as the origin (0, 0), and R2 and (W, 0), when the coordinates of the pen P and ^{(x, y), x 2} + y 2 ^{= L1 2 (x-W)} 2 + y 2 = L2 2 because made, x, and solving for ^{y, x = (L1 2 -L2} 2 + W 2) / 2W y = - (L1 2 -x 2) 1 / ^{As 2} , the coordinates P (x, y) can be obtained.

FIG. 8 shows an example of the moving mechanism of the receiver according to the present invention. This is because the sensor 10 slides between the liquid crystal display surface 11 and the display back surface 12 by ± 90 ° in FIGS.
As the sensor 10 falls, the liquid crystal display surface 1 is
1 or the pen 4 on the display back surface 12 so as to receive ultrasonic waves and infrared rays.

FIG. 8A shows an example in which the sensor holder (1) 7 and the sensor holder (2) 7 are arranged at the terminal.
In FIG. 8A, the display panel 8 is provided on the terminal 1 and corresponds to the screen 15.

The liquid crystal display 9 is a part of the liquid crystal display 9 arranged on the display panel 8 for actually displaying images and the like. As shown in FIGS. 8B to 8D, the sensor holder (1) 7 and the sensor holder (2) 7 are portions where the sensor holder 7 containing the sensor 10 is tilted by ± 90 °.

FIG. 8B shows the state of the sensor holder 7 when not in use. When not used, the hinge 19 is stored at an angle of 0 ° so that the hinge 19 just fits in the thickness of the liquid crystal display surface 11 and the display back surface 12. In this state, the sensor 1 mounted on the sensor holder 7
0 does not protrude on either the liquid crystal display surface (corresponding to the screen 15) 11 or the display rear surface (corresponding to the rear surface 16) 12, and presses the pen 4 on the liquid crystal display surface 11 or the display rear surface 12 to generate ultrasonic waves and infrared rays. Is not detected and none of them is used.

FIG. 8C shows the liquid crystal display surface 11.
3 shows the state of the sensor holder 7 when used. When used on the liquid crystal display surface 11, the hinge 19 that allows the sensor holder 7 to rotate freely is tilted 90 ° to the left as shown in FIG. And comes to a position where the pen 4 can be seen. In this state, the sensor 10 mounted on the sensor holder 7 has the liquid crystal display surface (corresponding to the screen 15) 1
When the pen 4 is depressed on the device 1 to transmit ultrasonic waves and infrared rays, the ultrasonic waves and infrared rays are transmitted to a sensor (the ultrasonic receiver 2 and the infrared PD).
3) It is possible to detect at 10 and input the coordinates.

FIG. 8D shows the state of the sensor holder 7 when used on the display back surface 12. When used on the display back 12, the hinge 19 that allows the sensor holder 7 to rotate freely is tilted 90 ° to the right as shown in FIG. Comes to a position where the pen 4 can be seen. In this state, when the sensor 10 mounted on the sensor holder 7 pushes the pen 4 on the display rear surface (corresponding to the rear surface 16) 12 to transmit ultrasonic waves and infrared rays, these are transmitted to the sensors (the ultrasonic receiver 2 and the infrared PD 3). ) 10
And the coordinates can be input.

FIG. 9 shows an example of the reflection plate of the present invention. This is because (b), (c) and (d) of FIG.
0 slides between the liquid crystal display surface 11 and the display back surface 12, whereas a reflector 14 is provided to fix the position of the sensor 10 and reflect the light toward the sensor 10 with the reflector 14. The ultrasonic wave and the infrared light radiated from the pen 4 on the display surface 11 or the display back surface 12 can be received.

FIG. 9A shows an example in which the reflecting plate (1) 14 and the reflecting plate (2) 14 are arranged at the terminal and reflected toward the sensor 10. 9A, the display panel 8 is a display panel 8 provided on the terminal 1 and corresponds to the screen 15.

The liquid crystal display 9 is a portion of the liquid crystal display 9 arranged on the display panel 8 for actually displaying images and the like. Reflector (1), Reflector (2)
Is for reflecting ultrasonic waves and infrared rays and making them incident on the sensors (1) and (2).

The sensor (1) and the sensor (2) use ultrasonic waves,
An element that receives infrared light. FIG. 9B shows a state in which a reflecting plate 14 is provided to reflect ultrasonic waves and infrared rays. As shown in the figure, ultrasonic waves and infrared rays emitted from the pen on the liquid crystal display surface 11 are reflected by the reflector 14 and received by the sensor 10. Similarly, ultrasonic waves and infrared rays emitted from the pen on the display back surface 12 are reflected by the reflector 14 and received by the sensor 10.

The reflector may be moved as shown in FIGS. 9C and 9D. FIG. 9C shows the position of the reflector when used on the liquid crystal display surface 11, and FIG. 9D shows the position of the reflector when used on the back of the display.

FIG. 10 shows an example of an ultrasonic sensor according to the present invention. This is because the sensor 10 slides between the liquid crystal display surface 11 and the display back surface 12 while the long cylindrical ultrasonic wave is used in FIGS. The sensors (1) and (2) 17 are provided so as to slightly protrude from the liquid crystal display surface 11 and the display surface 12, respectively. In this case, FIG.
0 (b), as shown in FIG.
Are made to protrude slightly from the liquid crystal display surface 11 and the display back surface 12, respectively, so that the ultrasonic waves emitted from the pen 4 on either surface can be detected. Further, since there is no long infrared sensor, two sets, one for the liquid crystal display surface 11 and the other for the display back surface 12, are arranged.

In this embodiment, the pen 4 transmits ultrasonic waves and infrared rays, and the terminal 1 receives the ultrasonic waves and infrared rays. However, either of them may be reversed. For example, when transmitting infrared light from the terminal side, the pen 4 transmits an ultrasonic wave when receiving the infrared light, and the terminal 1 side transmits the infrared light (or the time when the ultrasonic wave is actually transmitted from the pen 4 obtained by experiment). ) To receive the ultrasonic wave and calculate the coordinate position. When transmitting an ultrasonic wave from the terminal 1, the ultrasonic wave is transmitted from one ultrasonic transmitter of the terminal 1, and when the pen 4 receives the ultrasonic wave, the pen 4 transmits an infrared ray. The terminal 1 obtains a difference time T1 from transmission of an ultrasonic wave to reception of an infrared ray. Next, an ultrasonic wave is transmitted from the other ultrasonic transmitter of the terminal 1,
When the pen 4 receives the ultrasonic wave, similarly, the pen 4 returns an infrared ray, and the terminal 1 obtains the time difference T2. In any case, the pen 4 and the terminal 1 are synchronized with each other by infrared rays, and the ultrasonic transit time (time difference) between the pen 4 and the two ultrasonic transmitters or ultrasonic receivers of the terminal 1 And the coordinate position of the pen 4 on the screen or on the back surface may be calculated based on the principle of triangulation.

(Supplementary Note 1) In a coordinate input device for inputting coordinates on a screen or on a back surface, an ultrasonic receiver or an ultrasonic transmitter arranged on a side or a corner of the screen or on the back or in the vicinity thereof, Alternatively, a pen that transmits or receives an ultrasonic wave when a coordinate input instruction or writing is performed at an arbitrary position on the back, and transmits or receives an ultrasonic wave between the pen and the ultrasonic receiver or the ultrasonic transmitter And a means for detecting the coordinates.

(Supplementary note 2) An infrared transmitter or an infrared receiver is provided on the pen side for transmitting or receiving the ultrasonic wave and on the ultrasonic receiver or the ultrasonic transmitter side, and the former and the latter are provided. And transmit or receive infrared light, and based on the time at which the infrared light was transmitted or received, determine the time difference before receiving the ultrasonic wave and calculate the coordinates on the screen or on the back. 3. The coordinate input device according to claim 1, wherein

(Appendix 3) The coordinate input device according to appendix 1 or appendix 2, wherein the ultrasonic receiver is a cylindrical piezoelectric film.

(Supplementary Note 4) When the screen is opened, the ultrasonic receiver, the ultrasonic transmitter, or the reflecting plate is protruded or moved to transmit ultrasonic waves to and from the pen on the screen. Alternatively, the coordinate input device according to any one of supplementary notes 1 to 3, characterized in that the coordinate input apparatus receives.

(Supplementary Note 5) When the rear surface coordinate input instruction operation is performed, the ultrasonic receiver, the ultrasonic transmitter, or the reflecting plate is protruded or moved to transmit ultrasonic waves between the pen and the pen on the rear surface. 5. The coordinate input device according to any one of supplementary notes 1 to 4, wherein the coordinate input apparatus transmits or receives.
(4) (Supplementary note 6) A mechanism for fixing a paper on the screen or on the back surface is provided, and when writing with the pen capable of writing on the paper, the written coordinates are sequentially calculated. The coordinate input device according to any one of supplementary notes 1 to 5.

(Supplementary Note 7) In a coordinate input method for inputting coordinates on a screen or a back surface, an ultrasonic receiver or an ultrasonic transmitter arranged on a side or a corner of the screen or a back surface or in the vicinity thereof may be used. Or a pen for transmitting or receiving an ultrasonic wave when a coordinate input instruction or writing is performed at an arbitrary position on the back surface, and transmitting an ultrasonic wave between the pen and the ultrasonic receiver or the ultrasonic transmitter Alternatively, a coordinate input method characterized by receiving and detecting coordinates on a screen or a back surface based on the received ultrasonic signal.

[0082]

As described above, according to the present invention,
Coordinates can be input on the screen 15 and the back surface 16 of the terminal 1, and the touch panel function and the writing function can be realized with a simple configuration on the screen 15 and the back surface 16.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of one embodiment of the present invention.

FIG. 2 is a configuration diagram of a pen according to the present invention.

FIG. 3 is an example of a pen core insertion / removal mechanism of the present invention.

FIG. 4 is an explanatory diagram of the present invention.

FIG. 5 is a block diagram of a receiving circuit of the present invention.

FIG. 6 is a timing chart example of a reception signal according to the present invention.

FIG. 7 is an explanatory diagram of the present invention.

FIG. 8 is an example of a moving mechanism of a receiver according to the present invention.

FIG. 9 is an example of a reflection plate of the present invention.

FIG. 10 is an example of a receiver according to the present invention.

[Explanation of symbols]

 1: Terminal 2: Ultrasonic receiver 3: Infrared PD 4: Pen 5: Pen holder 6: Paper 7: Sensor holder 8: Display panel 9: Liquid crystal display 10: Sensor 11: Liquid crystal display surface 12: Display back 13: Input amplifier 14: arrival time detection circuit 15: screen 16: back 17: ultrasonic sensor 18: paper shears 19: hinge

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akira Fujii 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa F-term within Fujitsu Limited (Reference) 5B068 AA05 AA21 AA32 BB21 5B087 AA09 CC02 CC11 CC47

Claims (5)

[Claims] 1. A coordinate input device for inputting coordinates on a screen or a back surface, comprising: an ultrasonic receiver or an ultrasonic transmitter disposed on or near a side or a corner of the screen or the back surface; A pen that transmits or receives an ultrasonic wave when a coordinate input is instructed or written at an arbitrary position above, and that transmits or receives an ultrasonic wave between the pen and the ultrasonic receiver or the ultrasonic transmitter Means for detecting the coordinates. 2. An infrared transmitter or an infrared receiver is provided on the pen side for transmitting or receiving the ultrasonic wave and on the ultrasonic receiver or the ultrasonic transmitter side, and the former side and the latter side are provided. And transmitting or receiving infrared light, and calculating a time difference until receiving an ultrasonic wave based on the transmission or reception time of the infrared light to calculate coordinates on a screen or a back surface. Item 3. The coordinate input device according to Item 1. 3. When the screen is opened, the ultrasonic receiver, the ultrasonic transmitter, or the reflecting plate is protruded or moved to transmit or receive ultrasonic waves with the pen on the screen. 3. The coordinate input device according to claim 1, wherein 4. When the rear coordinate input instruction operation is performed, the ultrasonic receiver, the ultrasonic transmitter, or the reflecting plate is protruded or moved to transmit ultrasonic waves between the pen and the pen on the rear surface. The coordinate input device according to claim 1, wherein the coordinate input device receives the data. 5. A coordinate input method for inputting coordinates on a screen or a back surface, comprising: an ultrasonic receiver or an ultrasonic transmitter disposed on or near a side or a corner of the screen or the back surface; A pen for transmitting or receiving an ultrasonic wave when a coordinate input instruction or writing is performed at an arbitrary position above, transmitting or receiving an ultrasonic wave between the pen and the ultrasonic receiver or the ultrasonic transmitter And detecting coordinates on the screen or on the back side based on the received ultrasonic signal.