JP2000207122A - Presentation system, instruction transmission system, instruction transmitting method and pointing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the attention of the audience from being distracted due to an expositor being away from the position of a screen for conducting operatations at a computer in the presentation to be performed by magnifying and projecting the screen of a personal computer by a projector. SOLUTION: The video signal of a computer 3 is magnified and projected on a screen 5 by a projector 4 to conducting a presentation. An expositor 6 performs explanation while pointing the surface of the screen 5 with a pointing device 1 and by touching the surface of the screen 5 with the top end of the pointing device 1 or pressing a switch provided on a grip part, an ultrasonic wave modulated by a correspondent code is transmitted from the pointing device 1, received by a reception part 2 and transmitted to a computer 4, so that page feeding or predetermined operation can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of turning a page of a screen in a presentation or the like performed by enlarging and projecting a screen of a computer using a projector.
The present invention relates to a presentation system, an instruction transmission system, an instruction transmission method, and an instruction device for wirelessly operating a function normally performed by a mouse button or a keyboard, such as selecting a function.

[0002]

2. Description of the Related Art In recent years, personal computers and liquid crystal projectors have become widespread.
Using application software developed for presentations, efficient presentations have been made while displaying information on a large screen. However, in order to point to the displayed screen, it is necessary to operate a computer keyboard, a mouse, and the like, and an attendant may be distracted because the presenter moves away from the screen position. . In addition, in order to explain without leaving the position of the screen, an assistant must be arranged only for operating the computer, which goes against the efficiency of the presentation.

In order to solve such a situation, a method of wirelessly controlling a function of a mouse button or a specific function of a keyboard has been put to practical use. According to this method,
For example, the presenter can hold a transmitter and press a switch to perform page turning or the like. However, in a radio system using electromagnetic waves, detailed rules such as electric field strength are defined by the Radio Law and the like, and when commercialized, the circuit may become complicated and the cost may increase.

As another cordless system, there is a method using infrared rays. However, when combined with a device for photographing the presenter with a CCD camera or the like, the CCD camera has sensitivity in the infrared region, and thus may cause noise to the photographed video signal.

As another cordless system, there is a method using ultrasonic waves.

As one example, Japanese Patent Laid-Open Publication No. Hei 6-348412
Then, the ultrasonic wave transmitted from the indicator held by the presenter in the hand is measured by three receivers provided on the screen, the pointing position on the screen is specified by triangulation, and a predetermined pattern is given to the computer by a gesture pattern. Describes how to perform the operation. However, according to the method described therein, even if a simple operation such as page turning is performed, the ultrasonic wave is not transmitted.
Since the receiver must be received by two receivers, the presenter must have an indicator so that the transmitted ultrasonic waves always point toward the center of the screen, which limits the operation of the presenter.

As another example, Japanese Utility Model Application Laid-Open No. 56-1328
According to No. 51, a method is described in which only the transmission portion of the remote controller is rotatable and the orientation is adjusted in accordance with the directivity, thereby increasing the degree of freedom in the mounting position of the remote controller and the controlled unit. However, since the directivity itself does not expand, the remote control unit was not suitable for being used by hand.

[0008] As another example, Japanese Utility Model Publication No. 3-42753.
According to the above, in a remote control transmitter having a plurality of transmitting elements, only one of the transmitting elements is sequentially transmitted by clicking again, so that the transmitting output can be increased with a limited battery power source and the omnidirectional performance can be improved. A method of enhancing is described. However, since the information to be transmitted is applied as a common signal and transmitted by a selection signal, the transmission output is limited and the driving circuit is complicated.

As a system that can be used for presentations, a system having a coordinate position detecting function such as a resistive film system connected to a computer is connected to a computer, and the output is projected on the screen by a projector. When writing on a screen, a coordinate is detected, a signal is projected at the position, and an image that can be displayed as if written with an actual pen has been realized. However, to select functions such as selecting an eraser or performing file operations, there are also operations such as moving the cursor only without writing or dragging to specify a range on the screen. Although it is necessary, the conventional method is difficult to use because there is only a method such as hitting the screen twice consecutively or a method of operating a switch connected to the computer at another position.

[0010]

Means for Solving the Problems To solve the above problems, the present invention has the following arrangement.

[0011] The presentation system of the present invention comprises:
An instruction having a display means for displaying a video signal, and a plurality of transmitting elements for transmitting ultrasonic waves modulated corresponding to a plurality of kinds of operations, the member being for directly pointing on a screen displayed by the display means Receiving means for receiving and demodulating the ultrasonic waves generated by the means.
According to the present invention, it is possible to realize a presentation system that enables a presenter to move away from the position of the screen and to turn the page of the screen without operating the keyboard or the mouse.

Further, the presentation system of the present invention comprises a screen means having a coordinate position detecting means, a display means for displaying a video signal on the screen means,
A member for directly pointing on the screen displayed by the display means, receiving ultrasonic waves generated by instruction means having a plurality of transmitting elements for transmitting ultrasonic waves modulated corresponding to a plurality of types of operations. Receiving means for demodulation. According to the present invention, it is possible to realize a presentation system in which a description is given while writing characters, images, and the like on a screen using a pointing tool. Furthermore, since the force at which the tip switch of the pointer is turned on is set stronger than the force input to the resistive film, the cursor is moved by lightly pointing on the screen with the pointer, and writing is performed by strongly pointing. In this way, the functions can be easily used. Further, since a switch is provided on the grip portion of the pointing device, a pull-down menu for selecting a function can be displayed without touching the screen.

[0013] The presentation system of the present invention further comprises a first signal processing transmission means for transmitting a video signal;
Photographing means for photographing the periphery of the presenter and inputting it to the signal processing transmission means; display means for monitoring the output of the photographing means; and a plurality of ultrasonic waves modulated corresponding to a plurality of types of operations by the presenter. Receiving means for receiving and demodulating an ultrasonic wave generated by an instruction means for transmitting by the transmitting element, a second signal processing transmission means connected to the first signal processing transmission means, and the second signal processing transmission Display means for displaying the video signal restored by the means. According to the present invention, since the presenter can operate the pointing direction and zooming by operating the pointing tool while looking at the monitor while the presenter is located near the whiteboard or the like, the assistant for operating the camera can be used. A remote presentation system that does not require a person can be realized.
Furthermore, since the operation information from the pointing device is transmitted by ultrasonic waves, unlike the case of using the infrared LED, the operation information does not mix with the video signal captured by the camera as interference.

[0014] The instruction transmitting system according to the present invention further comprises a pointing device including a gaze unit, a switch unit, and a transmitting unit that generates an ultrasonic wave modulated in response to the operation of the switch unit, for directing a pointer. A receiving unit that receives the ultrasonic waves generated by the transmitting unit and instructs to perform signal processing according to the operation of the switch unit. ADVANTAGE OF THE INVENTION According to this invention, the system which can transmit the instruction | indication according to operation | movement of an instruction | indication tool can be implement | achieved, without operating a keyboard or a mouse | mouth from a remote position.

Further, in the above-mentioned instruction transmitting system, the receiving unit includes a frequency dividing circuit connected to an oscillation circuit, and a delay circuit for generating a pulse after a predetermined time from the reception of the ultrasonic wave. It is preferable to reset the peripheral circuit. Thus, even if the presenter moves or moves the pointing device, even if the distance between the pointing device and the receiving unit changes, the phase of the clock required for the shift register of the receiving unit is synchronized with the code that modulates the ultrasonic wave. Can be done.

Further, in the above-mentioned instruction transmitting system, the transmitting section includes a plurality of transmitting elements for transmitting an ultrasonic wave in response to an operation of the switch means, and a common electrode is provided to one electrode of the plurality of transmitting elements. One driving circuit is connected, one second driving circuit is connected to the other electrode for each transmitting element, and a common signal is applied to the first driving circuit and the second driving circuit. It is preferable that the signal applied to the second drive circuit be selectively inverted. Accordingly, since the transmitting element is differentially driven, the output voltage of the driving circuit can be reduced, the number of circuits can be reduced, and the configuration of the entire driving circuit can be simplified. Further, since the selection of inverting the signal can be performed at a low voltage, the selection circuit can be easily configured. In addition, since the inversion is selected one by one and sequentially switched, the ultrasonic waves are transmitted from only one transmitting element at the same time, so that the directivity is not disturbed by interference in space.

Further, in the above-mentioned instruction transmitting system, the switch means includes a first switch provided at a distal end portion of the indicator, the contact being connected by stress to close the circuit,
First coding means for sending a first code when the contact of the first switch is closed; and second coding means for sending a second code when the contact changes from a closed state to an open state. Preferably, the apparatus further comprises two coding means, and transmits the ultrasonic waves modulated by the first coding means and the second coding means. Thereby, information on whether or not the pointing tool is in contact with the screen can be transmitted.

Further, in the above-mentioned instruction transmitting system, the switch means is provided on a side surface of the indicator, and a contact is connected by a stress to close the circuit, and a switch of the second switch is closed. A third coding means for sending a third code, and a second coding means for sending a second code when the contact changes from a closed state to an open state. Preferably, the ultrasonic waves modulated by the third coding means and the second coding means are transmitted. Thereby, information as to whether or not the switch is pressed can be transmitted.

Further, in the above-mentioned instruction transmitting system, the receiving section includes at least one flip-flop means, and sets the flip-flop means when receiving the first code or the third code, and sets the second flip-flop means.
It is preferable to reset the flip-flop means upon receiving the code of (1). Thereby, if at least once received, the state of pressing or releasing the switch can be detected, and by moving the position of the indicator, even if correct data cannot be continuously received due to attenuation or reflection,
It is possible to prevent the information to the processing unit of the computer from being changed in an unstable manner and causing an undesired page feed.

Further, in the instruction transmission system, when the switch is closed, the ultrasonic wave modulated by the first code or the third code is continuously transmitted, and the switch is opened from the closed state. When the state has changed, it is preferable that the ultrasonic wave modulated by the second code is transmitted at least as many times as the number of the transmitting elements. Thus, if one of the directivities of the transmitting elements is oriented toward the receiving element, the receiving section can reliably receive the second code.

Further, in the above-mentioned instruction transmitting system, the transmitting element is attached so as to coincide with a radial axis having substantially the same angle between the transmitting element and the arbitrary point inside the pointing device, and It is preferable to be provided at a position on the distal end side of the portion. Thereby, irrespective of the direction of the pointing device, the ultrasonic wave can be transmitted to the entire circumference of the pointing device, and the transmitting element is not blocked by the manner of holding the presenter. You can focus on the presentation without worrying about how to hold it.

An instruction transmitting method according to the present invention is an instruction transmitting method using an indicating tool having a plurality of switch means, wherein different codes are generated in accordance with the operation of the plurality of switch means. An ultrasonic wave is modulated and transmitted according to a code, the modulated ultrasonic wave is received and the code is demodulated, and a process according to the code is instructed. ADVANTAGE OF THE INVENTION According to this invention, it becomes possible for an instruction | indication person (explanator) to transmit the instruction | indication according to operation of an instruction | indication tool, without operating a keyboard and a mouse | mouth.

Further, in the instruction transmitting method, it is preferable that different processing is performed on an image displayed on a display screen in accordance with an operation of the plurality of switch means.

The pointing device of the present invention is a rod-shaped pointing device. The first switch is provided at the distal end of the first switch and connects the contacts by stress to close the circuit. A second switch that connects and closes a circuit, and a transmission unit that generates a different code according to the opening and closing operations of the first switch and the second switch, and transmits an ultrasonic wave according to the different code. It is characterized by having. ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to transmit an instruction | indication according to operation of the different switch means provided in the instruction | indication tool, without operating a keyboard or a mouse | mouth from a remote position. .

Further, in the pointing device, the transmitting section includes a plurality of transmitting elements for transmitting an ultrasonic wave in response to an operation of the first switch means and the second switch means, and the plurality of transmitting elements. One electrode is connected to a common first drive circuit, and the other electrode is connected to one second drive circuit for each of the transmitting elements, and the first drive circuit and the second drive circuit are connected to each other. It is preferable that a common signal is applied to the circuit, and the signal applied to the second drive circuit is selectively inverted. Accordingly, since the transmitting element is differentially driven, the output voltage of the driving circuit can be reduced, the number of circuits can be reduced, and the configuration of the entire driving circuit can be simplified. Further, since the selection of inverting the signal can be performed at a low voltage, the selection circuit can be easily configured. In addition, since the inversion is selected one by one and sequentially switched, the ultrasonic waves are transmitted from only one transmitting element at the same time, so that the directivity is not disturbed by interference in space.

Further, in the pointing device, first coding means for transmitting a first code when the contact of the first switch means is closed, and the contact changes from a closed state to an open state. Send a second code if the second
It is preferable that an ultrasonic wave modulated by the first encoding means and the second encoding means is transmitted. Thereby, information on whether or not the pointing tool is in contact with the screen can be transmitted.

Further, in the pointing device, a third coding means for sending a third code when a contact of the second switch means is closed, and the contact is changed from a closed state to an open state. Send a second code if the second
Preferably, the ultrasonic wave modulated by the third coding unit and the second coding unit is transmitted. Thereby, information as to whether or not the switch is pressed can be transmitted.

Further, in the pointing device, when the switch means is closed, the first code or the third code is used.
If the switch means changes from the closed state to the open state, the ultrasonic wave modulated by the second code is transmitted at least as many times as the number of the transmitting elements. Preferably, it is transmitted. Thereby, if the directivity of one of the transmitting elements is directed toward the receiving element, the receiving unit can reliably receive the second code.

Further, in the pointing device, the transmitting element is attached so as to coincide with a radial axis having substantially the same angle with respect to an arbitrary point in the pointing device.
Preferably, it is provided at a position on the distal end side of the grip portion of the pointing device. Thereby, irrespective of the direction of the pointing device, the ultrasonic wave can be transmitted to the entire circumference of the pointing device, and the transmitting element is not blocked by the manner of holding the presenter. You can focus on the presentation without worrying about how to hold it.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment according to the present invention will be described with reference to the drawings.

FIG. 1 is a diagram for explaining a first embodiment of the present invention. The display data of the computer 3 is sent to the projector 4, projected and enlarged and displayed on the screen 5.

A receiving unit 2 connected to a computer 3 is placed near the projector 4 and receives an ultrasonic wave transmitted from the pointing device 1 of the presenter 6.

At the time of a presentation or the like, the presenter 6 is positioned near the screen 5 and gives an explanation while pointing at the screen with the pointing device 1, and operates a switch provided on the pointing device 1 to turn the page of the screen. And so on.

FIG. 2 shows an example of the pointing device 1.

FIG. 2A shows the appearance. The grip portion 30 is provided with an A switch 102 and a B switch 103, and a cylindrical transmitting element mounting portion 40 is provided in front of the A switch 102 and the B switch 103.
Transmission element A131, transmission element B132, transmission element C13
3 (not shown) are provided. Further, a distal end member 60 is provided via a hollow extension 50 at the end. Note that the A switch 102 and the B switch 103 need only be arranged near the grip portion 30 and not with the grip portion 30 so that they can be operated with a finger.

FIG. 2B shows a cross section of the transmitting element mounting section 40. The transmission element A131, the transmission element B132, and the transmission element C133 have their respective center lines provided at intervals of approximately 120 degrees, and each transmission element has directivity in the direction outside the cylinder.

FIG. 2C is a perspective view showing the vicinity of the tip of the pointing device 1. A hollow disk-shaped fixed electrode 52 is provided at the tip of the extension portion 50, and a movable electrode 53 having one end fixed by a fixing member 51 penetrates the center of the fixed electrode 52.
A tip member 60 is provided at the opposite end of the movable electrode 53. Further, the fixed electrode 52 and the movable electrode 53 are electrically connected to a circuit provided inside the grip portion 30 through the inside of the extension portion 50 by the wires 54 connected to each other. When a certain amount or more of lateral force is applied to the tip member 60, when the tip member 60 moves in the lateral direction, the movable electrode 53 also shifts in the lateral direction accordingly, and the fixed electrode 52 and the movable electrode 5 move.
The contact switch 3 is brought into a conducting state (ON) by contact, and the contact is separated by removing a force to constitute a tip switch 101 in a non-conducting state (OFF).

Explainer 6 states that these A switches 102,
By operating the B switch 103 and the tip switch 101,
A presentation can be made by advancing or returning the page of the screen projected and displayed on the screen 5 as the projection surface.

Next, FIG. 3 shows a block diagram of a circuit of the pointing device 1.

The tip switch 101 is connected in parallel with the A switch 102. When one of the switches is turned on, the A code generation circuit 112 intermittently continuously generates the A code which is predetermined 8-bit serial data. Also, B
When the switch 103 is turned on, the B code generation circuit 113
Thus, a B code, which is predetermined 8-bit serial data, is generated intermittently and continuously. When one of the switches changes from the on state to the off state, the release detection circuit 1
14, and the R code generation circuit 115 intermittently converts the R code, which is predetermined 8-bit serial data, into 6 bits.
Occurs consecutively.

The carrier oscillator 111 has a carrier wave of 40 k
Hz square wave, A code, B code, R code
The modulation is performed by the modulation circuit 116 in accordance with the code.

The operation of modulating the output of the carrier oscillator 111 with the modulation output 116 will now be described with reference to FIG.

As shown in FIG. 5A, the A switch 31
When 0 is on, the A code modulated by the A code generation circuit 112 appears intermittently and continuously. When the A switch 310 is turned off, the R code modulated by the R code generation circuit 115 intermittently changes to 6 bits. Appears twice.

FIG. 5B shows a state where the time axis of the A code and the R code is expanded, and FIG. 5C shows a state where the time axis is further expanded. FIG. 5D shows a carrier wave 311 which is an output of the carrier wave oscillator 111, and is a 40 kHz rectangular wave. As shown in FIGS. 5B, 5C and 5D, “1” is composed of a period in which 64 carrier wave pulses are present and a non-signal period of 64 pulses, and “0” is a carrier wave. Is constituted by a non-signal period of 128 pulses. The A code is “10010010” and the R code is “10000101”.

The modulated output 301 thus modulated
Is amplified by the driver Y121a of the drive circuit 122 in FIG. 3, and is applied to one terminal of the transmission element A131, the transmission element B132, and the transmission element C133. The carrier 311 is frequency-divided by 2048 by the frequency dividing circuit 117 and applied to the ring counter 118. The output of the ring counter 118 is an exclusive OR circuit (EXOR) 119a, 11
9b and 119c, and a modulation output 301 is connected to the other input of each, and these constitute a selection circuit 120. Also, EXOR1
Each output of 19a, 119b, and 119c is a driver A12
1b, a driver B 121c, and a driver C 121d, and the respective outputs are connected to the other terminals of the transmission element A 131, the transmission element B 132, and the transmission element C 133.

FIG. 6 shows these timing charts.

Outputs 303a, 3a of ring counter 118
03b and 303c are output at the timing shown in FIG. Since the modulation output 301 is connected to the other terminals of the EXORs 119a, 119b, and 119c, the output of the driver A, the output of B, and the output of C are respectively shown in FIG.
As shown in 304a, 304b and 304c, the modulation output 301 is inverted and output only while the output of the ring counter 118 is at the high level, and the modulation output 301 remains unchanged while the output of the ring counter 118 is at the low level. Are output at the same polarity level. FIG. 6B shows an enlarged view of the time axis so that these relationships can be easily understood. In the section (A), the driver A output 304a is inverted with respect to the modulation output 301, and 3
As shown at 05, a signal having a double amplitude, which is the potential difference between the two, is applied. In the section (a), the driver A output 3
Since the signal 04a has the same waveform as the modulation output 301, no signal is applied to the transmitting element A305. In this way,
Since the signal is applied to the corresponding transmission element only during the period when the output of the ring counter 118 is at the high level, the transmission element A 131, the transmission element B 132, and the transmission element C 133 are switched in order, and the waveform of the modulation output 301 exceeds It is converted into sound waves and transmitted to space.

In order to perform cordless transmission, FIG.
As shown in (1), a battery 123 is provided as a power source, and the DC-DC converter 124 converts the voltage into a necessary voltage in each unit and supplies the voltage.

Next, the ultrasonic receiving unit 2 described with reference to FIG.
FIG. 4 is a block diagram of the circuit shown in FIG.

The receiving element 201 is the transmitting element A of the pointing device 1.
131, an element for receiving the ultrasonic wave transmitted to the space from the transmission element B132, and the transmission element C133, and converts the received ultrasonic wave into an electric signal. The converted signal is supplied to the amplifier 2
02, the envelope signal is detected by the demodulator 203, the code signal is returned to the code signal before modulation, the waveform is shaped by the binarization circuit 204, and then the shift register 205 and the delay pulse generation circuit 2
06.

Here, the operation of the receiving section 2 will be described with reference to the timing chart of FIG. In FIG.
Driver Y driving the transmission element A131 provided on the side
5 shows a timing chart of an output 321 of the receiving unit 121a and a binarized output 322 of the binarizing circuit 204 of the receiving unit 2 shown in FIG.

As shown in FIG. 7, since the transmission speed of the ultrasonic wave at room temperature at room temperature is as low as about 346 m / sec, there is a delay proportional to the distance between the driver Y output 321 and the binary output 322. Has occurred.

The shift register 205 shown in FIG. 4 to which the binarized output 322 is input needs a clock 324 corresponding to each bit period of the received code. The oscillation circuit 208 in FIG. 4 oscillates a rectangular wave having substantially the same frequency as that of the carrier oscillator 111 of the pointing device. The counter 209 divides the frequency by 128 to generate a clock 324 and supplies the clock 324 to the shift register 205. . Therefore, the clock 324
Is a rectangular wave having substantially the same cycle as the cycle of each bit of the received code.

When the binarized output 322 becomes high level, the delay pulse generation circuit 206 generates a reset pulse 323 delayed by the time t, and resets the counter 209. When a reset is applied, the clock 324 rises and operates in the same cycle until the next reset is applied.
In this way, a rectangular wave whose phase is locked is obtained as the clock 324 in each bit cycle of the received code. Since the high-level period of the binarized output 322 corresponds to the length of approximately 64 oscillators 208, the time t may be set to about half, that is, 32 oscillators.

As described above, the output 325 of the shift register 205 becomes the driver Y output 321 as shown in FIG.
Is output at a high level correspondingly.
The “0” period is output at a low level correspondingly.

The shift register output 325 is connected to the A code detection circuit 210, the B code detection circuit 211, and the R code detection circuit 212. A code detection circuit 210,
The same codes as those of the A code generation circuit 112, the B code setting circuit 113, and the R code setting circuit 115 of the pointing device 1 are set in the B code detection circuit 211 and the R code detection circuit 212, respectively. When the demodulated code matches any of the codes A, B, and R, each outputs a high level. A code detection circuit 2
The output of 10 is the set terminal of flip-flop A213,
The output of the B code detection circuit 211 is a flip-flop B2
14 connected to the set terminal and the R code detection circuit 2
Since the output of No. 12 is connected to the reset terminals of the flip-flops A213 and B213, the output of the flip-flop A213 goes high when the A code is detected, and goes low when the R code is detected. . Similarly, when the B code is detected, the output of the flip-flop B214 goes high, and when the R code is detected, it goes low. Outputs of these flip-flops A and B are transmitted to the computer 3 and a process relating to a screen to be projected according to a switch operation is performed.

When the presenter 6 operates the screen using the mouse 216, the mouse driver circuit 215
And the outputs of the flip-flops A 213 and B 214 are connected to the computer 3 in parallel or switched with the buttons of the mouse 216.

The computer 3 supplies an image signal to be projected to the projector 4 and receives operation inputs from a switch of the pointing device 1, a mouse 216, a keyboard of the computer 4, a remote controller of the projector 4, and the like. An image processing circuit that variously processes an image of an image signal supplied to the projector 4 according to an input instruction is provided.

In this way, by setting in advance the operation to be performed in response to the switch of the pointing device in the computer, the presenter can give a presentation explaining the screen projected by the projector.
While standing near the screen, the presenter touches the tip of the pointing device in his hand with some force,
By pressing the switch, for example, page feed can be performed, and by pressing the B switch, for example, the previous page can be returned.

The function to be assigned by the three switches, the A switch, the B switch, and the tip switch, is not limited to the above description, and may be variously set. Further, the tip switch may be assigned and set to the same function as the B switch, or may be assigned and set to a function different from the A switch and the B switch.

According to the present invention, since the ultrasonic wave signal is transmitted from the pointer over a wide range, the presenter does not need to be aware of the direction of the pointer.

In the above description, for simplicity of description, the case of two switch functions has been described. However, it is possible to operate another function by providing another switch and using another code. Obviously you can.

Although the receiving section 2 is shown separately from the projector 4, it may be built in the projector 4.
Further, the computer 4, the projector 4, and the receiving unit 2 may be configured as an integrated device.

In this embodiment, a projector is used as a means for generating an image and displaying a screen, but the means for displaying is not limited to this. The screen 5 is a CRT or a plasma display (P
DP), electroluminescence (EL), field emission device (FED), etc., may be configured as a screen of a display screen of a self-luminous display device, or may be configured as a screen of a large liquid crystal display device.

(Second Embodiment) A second embodiment according to the present invention will be described with reference to the drawings.

FIG. 8 is a view for explaining a second embodiment of the present invention. A projector 4, a mirror 11, and a screen 10 are provided inside the housing 12. A screen projected by the projector 4 is folded back by the mirror 11, projected from the back of the screen 10, and an image formed on the screen is projected from the front. It constitutes a rear projector for observation.

A computer 9 is connected to the projector 4 and projects a screen generated by the computer 9. The screen 10 also serves as a coordinate input unit of the resistive film type. When the screen 10 is touched, information corresponding to the position is sent to the computer 9, and the computer 9 performs a calculation for obtaining coordinates. Therefore, by calibrating in advance, when the surface of the screen 10 is touched, the cursor of the computer 9 can be moved to that position. A receiving unit 8 is provided on a part of the front surface of the screen or a part of the front surface of the housing, and receives the ultrasonic wave transmitted from the pointing tool 7 of the presenter 6.

Also, the computer 9 is not necessarily a housing 12
It is not necessary to be located inside, and it may be provided outside.

At the time of a presentation or the like, the presenter 6 is located near the screen 10 and gives an explanation while pointing at the screen with the indicator 7, and operates the switches of the indicator 7 or places the indicator 7 on the screen 10. Writing can be performed by making contact with a certain amount of force.

FIG. 9 shows an example of the pointing device 7.

FIG. 9A shows the appearance. An A switch 102 and a B switch 103 are provided on the grip portion 70, and a hexagonal prism-shaped transmission element mounting portion 80 is provided ahead of the A switch 102 and the B switch 103. The transmission element A 131, the transmission element B 132, and the transmission element C
133 (not shown) is provided. Further, a tip member 90 is provided at the tip.

FIG. 9B shows a cross section of the transmitting element mounting section 80. The transmission element A131, the transmission element B132, and the transmission element C133 have their center lines provided at intervals of approximately 120 degrees, and each transmission element has directivity in the direction outside the hexagonal prism.

FIG. 9C is a perspective view showing the vicinity of the tip of the pointing device 7. The transmitting element mounting portion 80 is provided with a hollow disk-shaped fixed electrode 82, and a movable electrode 83 having one end fixed by a fixing member 81 penetrates the center of the fixed electrode 82.
A tip member 90 is provided at the opposite end of the movable electrode 83. The fixed electrode 82 and the movable electrode 83 are electrically connected to a printed circuit board 84 provided inside the grip portion 70 via a wire as necessary.
When a predetermined force or more in the lateral direction is applied to zero, the distal end member 90 moves in the lateral direction, and accordingly, the movable electrode 83 shifts in the lateral direction, and the fixed electrode 82 and the movable electrode 83 come into contact with each other to conduct ( ON), the contact is separated by removing the force, and the leading end switch 101 is brought into a non-conductive state (OFF). In addition, the force to be in the conductive state is the screen 10
Is set to be stronger than the force required for the resistance film to conduct.

FIG. 3 is a block diagram of a circuit of the pointing device 7. As shown in FIG.

The tip switch 101 is connected in parallel with the A switch 102. When one of the switches is turned on, the A code generation circuit 112 intermittently continuously generates the A code which is predetermined 8-bit serial data. Also, B
When the switch 103 is turned on, the B code generation circuit 113
Thus, a B code, which is predetermined 8-bit serial data, is generated intermittently and continuously. When one of the switches changes from the on state to the off state, the release detection circuit 1
14, and the R code generation circuit 115 intermittently converts the R code, which is predetermined 8-bit serial data, into 6 bits.
Occurs consecutively.

The carrier oscillator 111 has a carrier wave of 40 k
Hz square wave, A code, B code, R code
The modulation is performed by the modulation circuit 116 in accordance with the code.

The operation of modulating the output of the carrier oscillator 111 with the modulation output 116 will now be described with reference to FIG.

As shown in FIG. 5A, the A switch 31
When 0 is on, the A code modulated by the A code generation circuit 112 appears intermittently and continuously. When the A switch 310 is turned off, the R code modulated by the R code generation circuit 115 intermittently changes to 6 bits. Appears twice.

FIG. 5B shows a state where the time axis of the A code and the R code is expanded, and FIG. 5C shows a state where the time axis is further expanded. FIG. 5D shows a carrier wave 311 which is an output of the carrier wave oscillator 111, and is a 40 kHz rectangular wave. As shown in FIGS. 5B, 5C and 5D, “1” is composed of a period in which 64 carrier wave pulses are present and a non-signal period of 64 pulses, and “0” is a carrier wave. Is constituted by a non-signal period of 128 pulses. The A code is “10010010” and the R code is “10000101”.

The modulated output 301 thus modulated
Is amplified by the driver Y121a of the drive circuit 122 in FIG. 3, and is applied to one terminal of the transmission element A131, the transmission element B132, and the transmission element C133. The carrier 311 is frequency-divided by 2048 by the frequency dividing circuit 117 and applied to the ring counter 118. The output of the ring counter 118 is an exclusive OR circuit (EXOR) 119a, 119
b and 119c, and a modulation output 301 is connected to the other input of each, and these constitute a selection circuit 120. Also, EXOR11
Each output of 9a, 119b and 119c is a driver A121
b, a driver B 121c, and a driver C 121d, and the respective outputs are connected to the other terminals of the transmitting element A 131, the transmitting element B 132, and the transmitting element C 133.

FIG. 6 shows these timing charts.

Outputs 303a, 3a of ring counter 118
03b and 303c are output at the timing shown in FIG. Since the modulation output 301 is connected to the other terminals of the EXORs 119a, 119b, and 119c, the output of the driver A, the output of B, and the output of C are respectively shown in FIG.
As shown in 304a, 304b and 304c, the modulation output 301 is inverted and output only while the output of the ring counter 118 is at the high level, and the modulation output 301 remains unchanged while the output of the ring counter 118 is at the low level. Output at the same polarity level. FIG. 6B shows an enlarged view of the time axis so that these relationships can be easily understood.
In the section (A), the driver A output 304a is the modulation output 30
1 and the transmission element A131 has 305
As shown in FIG. 7, a signal having a double amplitude which is a potential difference between the two is applied. In the section (a), the driver A output 304
Since a has the same waveform as the modulation output 301, the transmission element A
No signal is applied to 305. In this way, the signal is applied to the corresponding transmitting element only during the period when the output of the ring counter 118 is at the high level.
The transmission element 31, the transmission element B132, and the transmission element C133 convert the waveform of the modulation output 301 into an ultrasonic wave and transmit it to space while switching in order.

In order to perform cordless transmission, FIG.
As shown in (1), a battery 123 is provided as a power source, and the DC-DC converter 124 converts the voltage into a necessary voltage in each unit and supplies the voltage.

Next, FIG. 4 shows a block diagram of a circuit of the ultrasonic wave receiving section 8 described in FIG.

The receiving element 201 is the transmitting element A of the pointing device 7.
131, an element for receiving the ultrasonic wave transmitted to the space from the transmission element B132, and the transmission element C133, and converts the received ultrasonic wave into an electric signal. The converted signal is supplied to the amplifier 2
02, the envelope signal is detected by the demodulator 203, the code signal is returned to the code signal before modulation, the waveform is shaped by the binarization circuit 204, and then the shift register 205 and the delay pulse generation circuit 2
06.

Here, the operation of the receiving section 2 will be described with reference to the timing chart of FIG. FIG.
4 shows a timing chart of the output 321 of the driver Y121a and the binarized output 322 of the binarization circuit 204 of the receiving unit 2.

As shown in FIG. 7, since the transmission speed of the ultrasonic wave in the space at room temperature is as low as about 346 m / sec, the distance between the driver Y output 321 and the binarized output 322 is proportional to the distance as shown in FIG. Has been delayed.

The shift register 205 of FIG. 4 to which the binary output 322 is input needs a clock 324 corresponding to each bit period of the received code. The oscillation circuit 208 in FIG. 4 oscillates a rectangular wave having substantially the same frequency as that of the carrier oscillator 111 of the pointing device. The counter 209 divides the frequency by 128 to generate a clock 324 and supplies the clock 324 to the shift register 205. . Therefore, the clock 324
Is a rectangular wave having substantially the same cycle as the cycle of each bit of the received code.

When the binarized output 322 becomes high level, the delay pulse generation circuit 206 generates a reset pulse 323 delayed by the time t, and resets the counter 209. When a reset is applied, the clock 324 rises and operates in the same cycle until the next reset is applied.
In this way, a rectangular wave whose phase is locked is obtained as the clock 324 in each bit cycle of the received code. Since the high-level period of the binarized output 322 corresponds to the length of approximately 64 oscillators 208, the time t may be set to about half, that is, 32 oscillators.

As described above, the output 325 of the shift register 205 becomes the driver Y output 321 as shown in FIG.
Is output at a high level correspondingly.
The “0” period is output at a low level correspondingly.

The shift register output 325 is connected to the A code detection circuit 210, the B code detection circuit 211, and the R code detection circuit 212. A code detection circuit 210,
The same codes as those of the A code generation circuit 112, the B code setting circuit 113, and the R code setting circuit 115 of the indicator 7 are set in the B code detection circuit 211 and the R code detection circuit 212, respectively. When the demodulated code matches any of the codes A, B, and R, each outputs a high level. A code detection circuit 2
The output of 10 is the set terminal of flip-flop A213,
The output of the B code detection circuit 211 is a flip-flop B2
14 connected to the set terminal and the R code detection circuit 2
Since the output of No. 12 is connected to the reset terminals of the flip-flops A213 and B213, the output of the flip-flop A213 goes high when the A code is detected, and goes low when the R code is detected. . Similarly, when the B code is detected, the output of the flip-flop B214 goes high, and when the R code is detected, it goes low. Outputs of these flip-flops A and B are transmitted to the computer 9 and a process related to a screen to be projected according to a switch operation is performed.

When the presenter 6 operates the screen using the mouse 216, the mouse driver circuit 215
And the outputs of the flip-flops A 213 and B 214 are connected to the computer 9 in parallel or switched with the buttons of the mouse 216.

The computer 9 supplies an image signal to be projected to the projector 4 and receives operation inputs from a switch of the indicator 7, a mouse 216, a keyboard of the rear projector, and a remote controller for operating the rear projector. An image processing circuit is provided for variously processing the image of the image signal supplied to the projector in accordance with the input instruction.

In this way, by setting in advance the operation to be performed in response to the switch of the pointing device in the computer, the presenter can present the computer on the screen in a presentation explaining the screen projected by the projector. Can be operated. In addition, since the force at which the tip switch of the pointing device conducts is set stronger than the force input to the resistive film, the cursor is moved by lightly pointing on the screen with the pointing device, and writing is performed by strongly pointing. Thus, the functions can be easily used properly. Further, since a switch is provided on the grip portion of the pointing device, a pull-down menu for selecting a function can be displayed without touching the screen.

The function to be assigned by the three switches, the A switch, the B switch, and the tip switch, may be assigned to the same function as in the first embodiment, or is not limited to this. Just do it. Further, the tip switch may be assigned and set to the same function as the B switch, or may be assigned and set to a function different from the A switch and the B switch.

According to the present invention, since the ultrasonic wave signal is transmitted from the pointer over a wide range, the presenter does not need to be aware of the direction of the pointer.

In the above description, for simplicity of description, the case of two switch functions has been described. However, it is possible to operate another function by providing another switch and using another code. Obviously you can.

In this embodiment, a projector is used as a means for generating an image and displaying a screen, but the means for displaying is not limited to this. The screen 10 may be configured as a display screen of a self-luminous display device such as a CRT, a plasma display (PDP), an electroluminescence (EL), and a field emission device (FED). No problem.

(Third Embodiment) A third embodiment according to the present invention will be described with reference to the drawings.

FIG. 10 is a diagram for explaining a third embodiment of the present invention. Characters and figures are drawn on the whiteboard 15 or paper prepared in advance is pasted thereon, and the presenter 6 gives a presentation or a lesson while pointing with the pointing tool 1 based on this. This situation is photographed by the camera 16, and the photographed image information is displayed on the monitor 1.
7, is coded by the transmission device 18 together with audio information (not shown), and is transmitted to another place by the network cable 19.

FIG. 11 shows another place. A video signal output from the transmission device 21 is input to the projector 4 and is enlarged and projected on the screen 22. Transmission device 21
Is connected to a network cable 20, and information on the network cable 19 is transmitted through a line. In this manner, the video taken by the camera 16 is displayed on the screen 22, audio information (not shown) is also reproduced, and a presentation or a lesson conducted in another place is performed on the spot. Can be reproduced at the same time, and remote presentations and classes can be realized.

Further, near the camera 16, the transmission device 1
The receiving unit 2 connected to the receiver 8 receives an ultrasonic wave oscillated from the pointing device 1 of the presenter 6.

In a presentation or the like, the presenter 6 is located near the whiteboard 15 and the pointing device 1
The explanation will be given while pointing at the whiteboard 15, and by operating the switch of the pointing device 1 while looking at the screen shot by the camera 16 on the monitor 17, the operation such as the camera direction and zooming can be performed. .

FIG. 2 shows an example of the pointing device 1.

FIG. 2A shows the appearance. The grip portion 30 is provided with an A switch 102 and a B switch 103, and a cylindrical transmitting element mounting portion 40 is provided in front of the A switch 102 and the B switch 103.
Transmission element A131, transmission element B132, transmission element C13
3 (not shown) are provided. Further, a distal end member 60 is provided via a hollow extension 50 at the end. Note that the A switch 102 and the B switch 103 need only be arranged near the grip portion 30 and not with the grip portion 30 so that they can be operated with a finger.

FIG. 2B shows a cross section of the transmitting element mounting section 30. The transmission element A131, the transmission element B132, and the transmission element C133 have their respective center lines provided at intervals of approximately 120 degrees, and each transmission element has directivity in the direction outside the cylinder.

FIG. 2C is a perspective view showing the vicinity of the tip of the pointing device 1. A hollow disk-shaped fixed electrode 52 is provided at the tip of the extension portion 50, and a movable electrode 53 having one end fixed by a fixing member 51 penetrates the center of the fixed electrode 52.
A tip member 60 is provided at the opposite end of the movable electrode 53. Further, the fixed electrode 52 and the movable electrode 53 are electrically connected to a circuit provided inside the grip portion 30 through the inside of the extension portion 50 by the wires 54 connected to each other. When a fixed or more lateral force is applied to the tip member 60, the fixed electrode 52 and the movable electrode 53 come into contact with each other to be in a conductive state (ON). Of the switch 101.

The explainer 6 determines that these A switches 102,
By operating the B switch 103 and the tip switch 101,
A presentation can be made by advancing or returning the page of the screen projected and displayed on the screen 15.

Next, FIG. 3 shows a block diagram of a circuit of the pointing device 1.

The tip switch 101 is connected in parallel with the A switch 102. When one of the switches is turned on, the A code generation circuit 112 intermittently continuously generates the A code which is predetermined 8-bit serial data. Also, B
When the switch 103 is turned on, the B code generation circuit 113
Thus, a B code, which is predetermined 8-bit serial data, is generated intermittently and continuously. When one of the switches changes from the on state to the off state, the release detection circuit 1
14, and the R code generation circuit 115 intermittently converts the R code, which is predetermined 8-bit serial data, into 6 bits.
Occurs consecutively.

The carrier oscillator 111 is a carrier wave of 40 k
Hz square wave, A code, B code, R code
The modulation is performed by the modulation circuit 116 in accordance with the code.

The operation of modulating the output of the carrier oscillator 111 with the modulation output 116 will be described with reference to FIG.

As shown in FIG. 5A, the A switch 31
When 0 is on, the A code modulated by the A code generation circuit 112 appears intermittently and continuously. When the A switch 310 is turned off, the R code modulated by the R code generation circuit 115 intermittently changes to 6 bits. Appears twice.

FIG. 5B shows a state in which the time axis of the A code and the R code is expanded, and FIG. 5C shows a state in which the time axis is further expanded. FIG. 5D shows a carrier wave 311 which is an output of the carrier wave oscillator 111, and is a 40 kHz rectangular wave. As shown in FIGS. 5B, 5C and 5D, “1” is composed of a period in which 64 carrier wave pulses are present and a non-signal period of 64 pulses, and “0” is a carrier wave. Is constituted by a non-signal period of 128 pulses. The A code is “10010010” and the R code is “10000101”.

The modulation output 301 thus modulated
Is amplified by the driver Y121a of the drive circuit 122 in FIG. 3, and is applied to one terminal of the transmission element A131, the transmission element B132, and the transmission element C133. The carrier 311 is frequency-divided by 2048 by the frequency dividing circuit 117 and applied to the ring counter 118. The output of the ring counter 118 is an exclusive OR circuit (EXOR) 119a, 119
b and 119c, and a modulation output 301 is connected to the other input of each, and these constitute a selection circuit 120. Also, EXOR11
The outputs of 9a, 119b and 119c are the driver A121
b, a driver B 121c, and a driver C 121d, and the respective outputs are connected to the other terminals of the transmitting element A 131, the transmitting element B 132, and the transmitting element C 133.

FIG. 6 shows these timing charts.

Outputs 303a, 3a of ring counter 118
03b and 303c are output at the timing shown in FIG. Since the modulation output 301 is connected to the other terminals of the EXORs 119a, 119b, and 119c, the output of the driver A, the output of B, and the output of C are respectively shown in FIG.
As shown in 304a, 304b and 304c, the modulation output 301 is inverted and output only while the output of the ring counter 118 is at the high level, and the modulation output 301 remains unchanged while the output of the ring counter 118 is at the low level. Are output at the same polarity level. FIG. 6B shows an enlarged view of the time axis so that these relationships can be easily understood. In the section (A), the driver A output 304a is inverted with respect to the modulation output 301, and 3
As shown at 05, a signal having a double amplitude, which is the potential difference between the two, is applied. In the section (a), the driver A output 3
Since the signal 04a has the same waveform as the modulation output 301, no signal is applied to the transmitting element A305. In this way,
Since the signal is applied to the corresponding transmission element only during the period when the output of the ring counter 118 is at the high level, the transmission element A 131, the transmission element B 132, and the transmission element C 133 are switched in order, and the waveform of the modulation output 301 exceeds It is converted into sound waves and transmitted to space.

In order to perform cordless transmission, FIG.
As shown in (1), a battery 123 is provided as a power source, and the DC-DC converter 124 converts the voltage into a necessary voltage in each unit and supplies the voltage.

Next, FIG. 4 shows a block diagram of the circuit of the ultrasonic receiving section 2 described with reference to FIG.

The receiving element 201 is the transmitting element A of the pointing device 1.
131, an element for receiving the ultrasonic wave transmitted to the space from the transmission element B132, and the transmission element C133, and converts the received ultrasonic wave into an electric signal. The converted signal is supplied to the amplifier 2
02, the envelope signal is detected by the demodulator 203, the code signal is returned to the code signal before modulation, the waveform is shaped by the binarization circuit 204, and then the shift register 205 and the delay pulse generation circuit 2
06.

Here, the operation of the receiving section 2 will be described with reference to the timing chart of FIG. In FIG.
Driver Y driving the transmission element A131 provided on the side
The output 321 of the receiving unit 121a and the output 321 of the receiving unit 2 supported in FIG.
4 shows a timing chart of the binarized output 322 of the digitizing circuit 204.

As shown in FIG. 7, since the transmission speed of the ultrasonic wave at room temperature is as low as about 346 m / sec, the delay between the driver Y output 321 and the binarized output 322 is proportional to the distance. Has occurred.

The shift register 205 of FIG. 4 to which the binarized output 322 is input needs a clock 324 corresponding to each bit cycle of the received code. The oscillation circuit 208 in FIG. 4 oscillates a rectangular wave having substantially the same frequency as that of the carrier oscillator 111 of the pointing device. The counter 209 divides the frequency by 128 to generate a clock 324 and supplies the clock 324 to the shift register 205. . Therefore, the clock 324
Is a rectangular wave having substantially the same cycle as the cycle of each bit of the received code.

When the binarized output 322 goes to a high level, the delay pulse generation circuit 206 generates a reset pulse 323 delayed by a time t, and resets the counter 209. When a reset is applied, the clock 324 rises and operates in the same cycle until the next reset is applied.
In this way, a rectangular wave whose phase is locked is obtained as the clock 324 in each bit cycle of the received code. Since the high-level period of the binarized output 322 corresponds to the length of approximately 64 oscillators 208, the time t may be set to about half, that is, 32 oscillators.

As described above, the output 325 of the shift register 205 becomes the driver Y output 321 as shown in FIG.
Is output at a high level correspondingly.
The “0” period is output at a low level correspondingly.

The shift register output 325 is connected to the A code detection circuit 210, the B code detection circuit 211, and the R code detection circuit 212. A code detection circuit 210,
The same codes as those of the A code generation circuit 112, the B code setting circuit 113, and the R code setting circuit 115 of the pointing device 1 are set in the B code detection circuit 211 and the R code detection circuit 212, respectively. When the demodulated code matches any of the codes A, B, and R, each outputs a high level. A code detection circuit 2
The output of 10 is the set terminal of flip-flop A213,
The output of the B code detection circuit 211 is a flip-flop B2
14 connected to the set terminal and the R code detection circuit 2
Since the output of No. 12 is connected to the reset terminals of the flip-flops A213 and B213, the output of the flip-flop A213 goes high when the A code is detected, and goes low when the R code is detected. . Similarly, when the B code is detected, the output of the flip-flop B214 goes high, and when the R code is detected, it goes low. The outputs of the flip-flops A and B are transmitted from the transmission device 18 to the camera 16, and the operation of the imaging state such as the direction of the camera and the zoom can be performed.

FIG. 4 shows a case in which the mouse driver 215 is used to connect to the transmission device 18 in parallel or switched with the outputs of the flip-flops A 213 and B 214 by assuming the case where the mouse 216 is used. If the mouse is not used, these circuits are unnecessary.

In this way, by preliminarily setting the operation to be performed in response to the switch of the pointing device, in the case of a remote presentation or a remote class, the tip of the pointing device held in the hand can be applied with a certain force. By touching the screen or pressing the A switch, for example, zooming up can be performed, and by pressing the B switch, for example, zooming out can be performed, so that an assistant for camera operation is not required. In addition, since the operation is performed by ultrasonic waves, the video signal captured by the camera is not disturbed as noise. Further, since the ultrasonic signal is transmitted from the pointer over a wide range, the presenter does not need to be aware of the direction of the pointer.

The function to be assigned by the three switches, the A switch, the B switch, and the tip switch, is not limited to the above description, and may be variously set. Further, the tip switch may be assigned and set to the same function as the B switch, or may be assigned and set to a function different from the A switch and the B switch.

In the above description, for simplicity of explanation, the case where the switch has two functions has been described. However, by providing another switch and using another code, for example, the direction of the camera can be changed. Obviously, other functions can be operated.

Although the receiving section 2 is shown separately from the camera 16, it may be built in the camera 16. Further, the camera 16, the transmission device 18, and the reception unit 2 may be configured as an integrated device.

In the present embodiment, the projector 4 is used as a means for generating an image and displaying a screen, but the means for displaying is not limited to this. The screen 5 is a CRT or a plasma display (P
DP), electroluminescence (EL), field emission device (FED), etc., may be configured as a screen of a display screen of a self-luminous display device, or may be configured as a screen of a large liquid crystal display device.

[0133]

As described above, according to the present invention,
It is possible to realize a presentation system that enables a presenter to move away from a position on a screen and to perform page turning without operating a keyboard or a mouse.

Further, a presentation system can be realized in which a description is given while writing characters and images on the screen using the pointing tool. Furthermore, since the force at which the tip switch of the pointer is turned on is set stronger than the force input to the resistive film, the cursor is moved by lightly pointing on the screen with the pointer, and writing is performed by strongly pointing. In this way, the functions can be easily used. Further, since a switch is provided on the grip portion of the pointing device, a pull-down menu for selecting a function can be displayed without touching the screen.

In addition, since the presenter can operate the pointing device while operating the pointing tool while looking at the monitor while near the whiteboard or the like, the assistant for operating the camera can be operated. A remote presentation system that does not require a computer can be realized. Furthermore, since the operation information from the pointing device is transmitted by ultrasonic waves, unlike the case of using the infrared LED, the operation information does not mix with the video signal captured by the camera as interference.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a pointing device according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating an example of a circuit of a pointing device according to the first, second, and third embodiments of the present invention.

FIG. 4 is a block diagram illustrating an example of a receiving unit according to the first, second, and third embodiments of the present invention.

FIG. 5 is a timing chart illustrating the operation of the pointing device according to the first, second, and third embodiments of the present invention.

FIG. 6 is a timing chart illustrating an operation of the drive circuit according to the first, second, and third embodiments of the present invention.

FIG. 7 is a timing chart illustrating transmission / reception operations according to the first, second, and third embodiments of the present invention.

FIG. 8 is a diagram showing a second embodiment of the present invention.

FIG. 9 is a diagram illustrating an example of a pointing device according to a second embodiment of the present invention.

FIG. 10 is a diagram showing a third embodiment of the present invention.

FIG. 11 is a diagram showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pointer 2 Receiver 3 Computer 4 Projector 5 Screen 6 Explainer 7 Pointer 8 Receiver 9 Computer 10 Screen 11 Mirror 12 Housing 15 Whiteboard 16 Camera 17 Monitor 18 Transmission device 19 Network cable 20 Network cable 21 Transmission device 22 Screen 30 gripping part 40 transmitting element mounting part 50 extension part 51 fixing member 52 fixed electrode 53 movable electrode 54 wire 60 tip member 70 gripping part 80 transmitting element mounting part 81 fixing member 82 fixed electrode 83 movable electrode 84 printed board 90 tip member 101 Tip switch 102 A switch 103 B switch 111 Carrier oscillator 112 A code generation circuit 113 B code generation circuit 114 Release detection circuit 115 R code generation circuit 116 Modulation time 117 frequency divider circuit 118 ring counter 119a, 119b, 119c EXOR 120 selection circuit 121a driver Y 121b driver A 121c driver B 121d driver C 122 drive circuit 123 battery 124 DC-DC converter 131 transmission element A 132 transmission element B 133 transmission element C Reference Signs List 201 reception element 202 amplification circuit 203 demodulation circuit 204 binarization circuit 205 shift register 206 delay pulse generation circuit 208 oscillation circuit 209 counter 210 A code detection circuit 211 B code detection circuit 212 R code detection circuit 213 flip-flop A 214 flip-flop B 215 Mouse driver circuit 216 Mouse 301 Modulation output 302 Divided output 303a, 303b, 303c Ring counter output 304a, 30 4b, 304c Driver output 305 Transmission element A input 311 Carrier 321 Driver Y output 322 Binary output 323 Reset pulse 324 Clock 325 Shift register output

Claims (19)

[Claims] 1. A display means for displaying a video signal, and a plurality of members for directly pointing on a screen displayed by the display means for transmitting ultrasonic waves modulated corresponding to a plurality of kinds of operations. A presentation system comprising: a receiving unit that receives and demodulates an ultrasonic wave generated by an instruction unit having a transmission element. 2. A screen means having a coordinate position detecting means, a display means for displaying a video signal on the screen means, and a member for directly pointing on a screen displayed by the display means, a plurality of types of operation Receiving means for receiving and demodulating ultrasonic waves generated by the instruction means having a plurality of transmitting elements for transmitting ultrasonic waves corresponding to,
A presentation system comprising: 3. A first signal processing and transmitting means for transmitting a video signal, a photographing means for photographing the periphery of the presenter and inputting it to the signal processing and transmitting means, and a display means for monitoring an output of the photographing means. Receiving means for receiving and demodulating ultrasonic waves generated by an instruction means for transmitting ultrasonic waves modulated corresponding to a plurality of kinds of operations by the presenter by a plurality of transmitting elements, and the first signal processing transmitting means; A presentation system, comprising: a second signal processing / transmission unit connected thereto; and a display unit for displaying a video signal restored by the second signal processing / transmission unit. 4. A gaze means for a pointer to directly point,
A switch unit, an indicator including a transmission unit that generates an ultrasonic wave modulated in response to the operation of the switch unit, and a signal processing unit that receives the ultrasonic wave generated by the transmission unit and performs signal processing according to the operation of the switch unit. An instruction transmission system, comprising: a receiving unit that instructs the user to perform the instruction. 5. The receiving unit includes a frequency dividing circuit connected to an oscillation circuit, and a delay circuit that generates a pulse after a predetermined time from the reception of the ultrasonic wave, and resets the frequency dividing circuit by the pulse. The instruction transmission system according to claim 4, wherein the instruction transmission is performed. 6. The transmitting section includes a plurality of transmitting elements for transmitting ultrasonic waves in response to an operation of the switch means, and a common first driving circuit is provided to one electrode of the plurality of transmitting elements. The other electrode is connected to one second driving circuit for each transmitting element, and the first driving circuit and the second driving circuit are connected to the second electrode.
5. The instruction transmission system according to claim 4, wherein a common signal is applied to the driving circuit, and the signal applied to the second driving circuit is selectively inverted. 7. A first switch provided at a tip portion of the indicator and connected to a contact by stress to close a circuit, and a first switch when the contact of the first switch is closed. A first encoding means for transmitting a code; and a second encoding means when the contact changes from a closed state to an open state.
5. The instruction transmission according to claim 4, further comprising a second encoding unit that transmits the code of (1), transmitting the ultrasonic wave modulated by the first encoding unit and the second encoding unit. system. 8. The switch means is provided on a side surface of the pointing device, wherein a contact is connected by a stress to close a circuit.
And a third coding means for sending a third code when the contact of the second switch is closed, and a second code when the contact changes from a closed state to an open state. 8. An ultrasonic wave modulated by the third encoding means and the second encoding means, comprising: a second encoding means for transmitting a signal.
Instruction transmission system as described. 9. The receiving unit includes at least one flip-flop unit, sets the flip-flop unit when receiving the first code or the third code, and sets the flip-flop unit when receiving the second code. 9. The instruction transmission system according to claim 7, wherein the flip-flop means is reset. 10. When the switch is closed, the ultrasonic wave modulated by the first code or the third code is continuously transmitted, and when the switch changes from a closed state to an open state. And transmitting the ultrasonic wave modulated by the second code at least as many times as the number of the transmitting elements.
An instruction transmission system according to any one of the above. 11. The transmitting element is mounted so as to coincide with a radial axis having substantially the same angle with respect to an arbitrary point in the pointing device, and is located closer to the distal end than the grip portion of the pointing device. 5. The instruction transmission system according to claim 4, wherein the instruction transmission system is provided at a position. 12. An instruction transmitting method using an indicator having a plurality of switch means, wherein different codes are generated in response to operation of the plurality of switch means, and an ultrasonic wave is modulated in accordance with the code. Transmitting, receiving the modulated ultrasonic wave and demodulating the code,
An instruction transmission method characterized by instructing a process corresponding to the code. 13. The instruction transmission method according to claim 12, wherein different processing is performed on an image displayed on a display screen in accordance with an operation of said plurality of switch means. 14. A rod-shaped indicator, a first switch means provided at a tip portion thereof for connecting a contact by a stress to close a circuit, and a switch provided on a side surface thereof for connecting a contact by a stress to connect a circuit. A second switch for closing;
A transmitting unit that generates a different code according to the opening / closing operation of the switch unit and the second switch unit, and transmits an ultrasonic wave corresponding to the different code. 15. The transmitting section includes a plurality of transmitting elements for transmitting ultrasonic waves in response to operations of the first switch means and the second switch means, and one electrode of the plurality of transmitting elements. Is connected to a common first drive circuit, the other electrode is connected to one second drive circuit for each of the transmitting elements, and the first drive circuit and the second drive circuit are 15. The pointing device according to claim 14, wherein said signal is applied, and said signal applied to said second drive circuit is selectively inverted. 16. A first encoding means for transmitting a first code when a contact of the first switch means is closed, and a second encoding means for transmitting a first code when the contact changes from a closed state to an open state. 15. The pointing device according to claim 14, further comprising: a second encoding unit that transmits the code of (c), wherein the ultrasonic wave modulated by the first encoding unit and the second encoding unit is transmitted. . 17. A third encoding means for transmitting a third code when a contact of the second switch means is closed, and a second encoding means for transmitting a third code when the contact changes from a closed state to an open state. 17. The apparatus according to claim 14, further comprising: a second encoding unit that transmits the code of (c), transmitting the ultrasonic wave modulated by the third encoding unit and the second encoding unit. Pointer. 18. When the switch is closed, the ultrasonic wave modulated by the first code or the third code is continuously transmitted, and when the switch changes from a closed state to an open state. 18. The pointing device according to claim 16, wherein the ultrasonic wave modulated by the second code is transmitted at least as many times as the number of the transmitting elements. 19. The transmitting element is mounted so as to coincide with a radial axis having substantially the same angle about an arbitrary point in the pointing tool, and is located on the tip side of the grip portion of the pointing tool. 15. The pointing device according to claim 14, wherein the pointing device is provided at a position.