JP3469888B2 - Infrared multi-pulse modem and infrared data transmission system using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared multi-pulse modulation / demodulation repeater (hereinafter referred to as an infrared repeater) and an infrared data transmission system that use infrared rays as a communication medium. Note that in this specification, multi-pulse modulation means that one pulse of a digital signal is divided into a plurality of pulse groups each having the same height (current or light intensity) and a small width. The multi-pulse demodulation means returning the multi-pulse modulated signal to a digital signal having an original pulse width.

[0002]

2. Description of the Related Art Conventional indoor or near field communication is sent as an electric signal through an electric cable such as a coaxial cable. Further, a communication signal such as code data may be converted into a laser pulse signal and transmitted by an optical fiber cable. For example, regarding security, we installed sensors and door switches to detect intruders on the windows and doors of rooms such as conference rooms, reception rooms, and sheds in buildings and condominiums, and installed those sensors and switches in the management room. The monitor is connected to each monitor via a wire such as an individual telecommunication line. The condition signals and status signals sent from the sensors are monitored or managed by the monitor or computer in the management room.

In addition, unlocking and locking each room can be done with a card or ID.
The digital signal of the entry / exit control system or the image (digital) signal of the security camera, which is performed by a code, is also transmitted to and received from the manager's office by using individual communication lines. on the other hand,
When transmitting various signals between buildings adjacent to each other across a public road, a caisson or duct in the underground of the public road is routed with electric wires or optical fiber cables, or overhead wires are used to secure a communication path. Is the current situation.

Further, mainly in factories, when remote centralized control in physical distribution or machining remote centralized control for various automatic machine tools and transfer robots is performed, transmission of digital signals is individually communicated to each device or facility. Wire (wire) is wired.

[0005]

Since the security-related management system is individually wired between various sensors and switches and the monitor in the management room,
The wiring is complicated. Therefore, there is a problem that wiring work and maintenance are complicated and costly. Also, cable communication between buildings adjacent to each other across a public road requires permission from the road administrator and the competent government agency of the telecommunications business to install the cable on the public road, and also requires a great deal of construction costs. . Further, even in the remote centralized control system in the factory, it is necessary to connect each device to the centralized control panel or computer with a huge amount of wiring, which requires a large amount of work and maintenance. Further, the complicated wiring may be a source of noise, or crosstalk may cause malfunction of the automatic machine.

On the other hand, in order to eliminate the adverse effects of these complicated wiring groups, for example, wireless communication using electromagnetic waves may be adopted. However, when a large number of devices in the same building are connected wirelessly, It is said that there is a high possibility that interference may occur between the communications of each other, or that there may be radio interference from other devices (for example, cordless telephones, televisions, radio receivers, etc.), or conversely it may cause radio interference of other devices. There's a problem. Further, a communication system using an infrared transmission / reception device used in a remote control device for home electric appliances can be considered, but they are not practical because of short transmission distance.

The present invention solves the problem in the case where a large number of wirings in a small-scale communication line in the same building or between adjacent buildings are complicated, and a communication transmission system which is easy to construct and maintain and an infrared multi-system used for the communication transmission system. It is a technical object to provide a pulse modulation / demodulation repeater.

[0008]

An infrared repeater according to the present invention (claim 1) includes an infrared receiver for receiving and amplifying an infrared multi-pulse modulated signal by an infrared light receiving element and demodulating it into code data. , And an infrared multi-pulse modulation transmitter which transmits the code data from the infrared receiver again as an infrared multi-pulse modulation signal, and the infrared multi-pulse modulation transmitter is installed in the receiver.
They are arranged in a spherical concave surface so that the optical axes intersect.
A group of light emitting elements and the group of light emitting elements
It is composed of a driving means that emits multi-pulse modulated light for division.
In addition, the infrared intensity attenuated by the transmission distance can be restored to the original intensity. Also bill
The repeater of item 2 is an infrared multi-sensor with an infrared receiving element.
Receives and amplifies the pulse-modulated signal and converts it into code data.
Infrared receiver for chip pulse demodulation
Infrared multi-pulse modulated signal from the code data
With infrared multi-pulse modulation transmitter
Well, the infrared multi-pulse modulation transmitter is
They are arranged in a spherical concave surface so that the optical axes intersect.
The group of light-emitting elements and the group of light-emitting elements
Drive means for emitting light simultaneously, and
So that the attenuated infrared intensity can be restored to the original intensity
It is characterized by that.

Further, in the repeater according to a third aspect of the present invention, the latch means for temporarily latching the code data from the infrared receiver, the input terminal to which the data is input, and the data input to this input terminal are stored. A storing means for temporarily storing and a mixing section for outputting the latched data and the stored data by time division multiplexing are provided, and the code data output from the mixing section is multi-pulse from the infrared multi-pulse modulation transmitter. By transmitting as a modulated signal, new data in addition to the received data can be transmitted to an arbitrary destination.

Furthermore, in the repeater according to claim 4, comprising a distribution circuit for taking the communication data following the address data to identify the self-address data from the data to which the infrared receiver is converted, yourself from a number of transmission sources It is characterized in that it can receive transmissions addressed to it. Claims
In the repeater of No. 5 , latch means for temporarily latching the code data from the infrared receiving section, an input terminal for inputting the data, and storing means for temporarily storing the data input to the input terminal A mixing unit for outputting the latched data and the stored data in a time division manner, and a distribution circuit for identifying its own address data from the data converted by the infrared receiving unit and capturing communication data following the address data. Since the converted data is transmitted from the infrared multi-pulse modulation transmission device as a multi-pulse modulation signal, it is possible to receive transmissions addressed to itself from a large number of transmission sources, and to add new data to the received data. The feature is that the data can be sent to many destinations.

[0011]

The infrared data transmission system according to claim 6 is
An infrared multi-pulse modulation transmission device, an infrared multi-pulse demodulation reception device, and any one of the infrared multi-pulse modulation / demodulation repeaters interposed therebetween are characterized. In the infrared data transmission system of claim 7, the infrared multi-pulse modulation / demodulation repeaters are arranged in a ring shape. Claim 8
In the above infrared data transmission system, the infrared multi-pulse modulation / demodulation repeaters are arranged in a mesh.

[0013]

According to the present invention, since the communication medium is infrared rays, it does not affect peripheral devices and can prevent malfunction. Thereby, it is possible to construct a highly reliable infrared spatial data transmission line.

An infrared repeater according to the present invention (claim 1)
Is an infrared multi-pulse modulated signal that is amplified by the infrared transmitter or the infrared repeater one step before, and sends the signal again in a different direction as an infrared multi-pulse modulated signal. The signal can again be restored to the original clear multi-pulse modulated signal. Therefore, by sequentially arranging the infrared repeaters on the transmission line, the infrared spatial transmission line can be configured almost infinitely up to the required transmission distance. Furthermore, one
Group of infrared light emitting elements and a group of infrared light emitting elements
And a driving means for sequentially performing time-division multi-pulse modulated light emission
Since it is equipped with the data that you want to send,
The light is emitted to the outside light emitting elements in a time-sharing manner, so to speak.
Therefore, it is possible to send one communication data as a whole.
Wear. Therefore, the duty ratio becomes smaller and
The burden of each light emitting element is reduced,
Therefore, the drive current can be increased. for that reason
The emission intensity can be increased and the transmission distance can be lengthened.
be able to. This emits light in time division, so
Then, the drive current does not increase. Also, for the receiver
Are arranged in a spherical concave surface so that the optical axes intersect.
Equipped with a group of light emitting elements, it enables long-distance transmission.
It In the repeater according to claim 2, the group of infrared light emitting elements are the same.
Since there is a driving unit that emits light when
High body current, but extremely high light output
You can Therefore, the transmission depends on the number of infrared light emitting elements.
The sending distance can be increased.

In the infrared repeater according to the third aspect , in addition to the infrared multi-pulse modulated signal sent from the infrared repeater one stage before, the communication signal originating from itself is transmitted by the same time division multiplexing method. It can be placed on the line and transmitted. Therefore, new data can be transmitted to an arbitrary destination in addition to the received data without causing the transmission line to be complicated.

[0016] In the repeater of claim 4, it is provided with the distribution circuit for taking the communication data following the received signal to the self against the address data, communication data transmitted from the transmitter or before one stage repeater You can retrieve the data addressed to yourself from. Data that is not addressed to itself can be sent to the next repeater or receiver again. That is, if the communication data following the address data is transmitted by the time-division multiplexing method by the infrared multi-pulse modulation signal, the infrared repeaters that are transmitted next receive the signals selected by themselves. As a result, it is possible to construct a line for transmitting to a large number of receivers with only one transmission line. In the repeater according to claim 5 ,
The communication data addressed to itself can be taken in, and further, the data originated by the user can be transmitted to any destination. Therefore, so to speak, it is possible to construct a transmission line network for transmitting from a large number of transmission sources to a large number of destinations.

[0017]

[0018]

[0019]

According to the sixth aspect of the infrared transmission system, the infrared transmitter, the repeater, and the receiver do not have a bad influence on the surroundings and are not adversely affected by the surroundings.
It is possible to construct a transmission line that is simple and easy to install and maintain.

In the transmission system according to the seventh aspect , since the repeaters that can be originated from itself and can be addressed to itself are arranged in a ring shape, it is possible to originate from any of the repeaters.
Can receive.

In the transmission system of the eighth aspect , since the repeaters are arranged in a mesh, it is possible to construct a transmission line network for transmitting from a large number of transmission sources to a large number of destinations.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an infrared repeater and an infrared data transmission system of the present invention and an infrared transmitter used for them will be described in detail with reference to the drawings. First, a transmitter which is preferably used in the repeater and the transmission system of the present invention will be described. In FIG. 1a, 1
Is an infrared transmitting device (hereinafter, simply referred to as a transmitting device) that emits infrared rays, and the transmitting device 1 faces an infrared receiving device (hereinafter, simply referred to as a receiving device) 11 installed at a position apart by, for example, several tens of meters. Is arranged. The transmitter 1 includes a light emitting section 9 including a support plate 3 having a plurality of infrared light emitting elements (hereinafter, simply referred to as light emitting elements) 2 such as infrared light emitting diodes, and a multi-pulse modulation for the light emitting element 2 of the light emitting section 9. Modulation circuit 8 for sending a signal and light emitting element 2
And a control unit 6 for controlling the driving order of the above. The receiving device 11 is an infrared light receiving element (hereinafter, simply referred to as a light receiving element) including a photodiode or a phototransistor.
It has twelve. The surface of the support plate 3 on the receiving device 11 side is a spherical or parabolic concave surface.
The plurality of infrared light emitting elements 2 are attached to the concave portion so as to be perpendicular to the attachment surface.

As shown in FIG. 1b, one light emitting element 2 is mounted at the center of the support plate 3, and six light emitting elements 2 are mounted in the circumference of the support plate 3. In the example shown in FIG. Seven light emitting elements 2 (2 ₁ to 2 ₇ ) are provided. And the support plate 3
Are formed in the shape of a parabolic antenna, the optical axes B of the seven light emitting elements 2 intersect each other at positions (focus points) F separated by a distance L. Therefore, if one light receiving element 12 of the receiving device 11 is arranged so as to face the focal point F, the signal from the transmitting device 1 can be received by the receiving device 11. As can be seen from the above, the transmission distance L
The position where the optical axis B intersects may be changed according to the above, and for that purpose, the curvature of the concave surface portion of the support plate 3 may be appropriately set according to the transmission distance L. That is, when the concave portion is a spherical surface, the radius of curvature is the transmission distance L, and when it is a paraboloid, the distance to the focal point is the transmission distance L. Further, the light-emitting elements 2 ₁ -
The distance between 2 ₇ and the light receiving element 12 is substantially equal.

Although the number of the light emitting elements 2 is seven in the embodiment shown in FIG. 1, the number is not limited to this.
Eight or more may be provided in a row, and six or less may be provided. In particular, if it corresponds to the number of bits of code data described later, 8
For example, 16 pieces, 32 pieces, etc. are adopted. When the number of the light emitting elements 2 is large, the outer light emitting elements may be arranged in a double annular shape or arranged radially. Further, they may be densely arranged within a range where they do not affect each other. Further, the support plate 3 may be formed in a frame shape whose angle can be adjusted so that the transmission distance L can be adjusted. Furthermore, when a group of light emitting elements 2 is arranged closer to the center, they may be arranged so that their optical axes are substantially parallel.

FIG. 2 is a block diagram of an electric circuit of the transmitter 1. The electric circuit is, for example, 40 to 500 kHz.
Control unit 6 for the multi-pulse signal by the oscillating circuit 4 which outputs a signal as a carrier of the frequency of, and the demultiplexer 7 which outputs in parallel in a time division manner so as to distribute to each light emitting element
Signal output section 5 which outputs code data composed of predetermined address data and control data, and multi-pulse modulation is performed by taking the logical product of the output of the demultiplexer 7 and the output of the signal output section 5. The AND gate array G ₁ includes a totem pole buffer array Q that drives each light emitting element 2 based on a command from the control unit 6 for a multi-pulse modulated signal to the AND gate array G ₁ . A part of the control unit 6, the oscillation circuit 4, a part of the AND gate array G _{1 and} the like constitute a multi-pulse modulation circuit, and a part of the control unit 6 and a part of the AND gate array G _{1 and} the like. It constitutes the control means.

The output of the demultiplexer 7 is set to 7 outputs, 7 circuits of totem pole buffer arrays Q are connected to the respective output terminals, and the light emitting elements 2 (2 ₁ to 2 ₇ ) are connected to the output side via the resistor R. Connect and demultiplexer 7
So that light is emitted sequentially time-division light-emitting element 2 ₁ to 2 ₇ turns on the totem pole buffer array Q by the output of. That is, 1 character (1 cycle of infrared emission)
Is set as 7 bits, and the 7-bit code data is sent from the signal output unit 5 controlled by the control unit 6,
"1" of each bit, enter the serial signal corresponding to "0" to the AND gate array G _1, synchronize taken respectively in time division from the output terminal of the AND gate array G ₁ output by the control unit 6 and, the if the bit data corresponding to "1" H level is output when, by turning on the totem pole buffer array Q, is intended to emit light in a time division emitting element 2 ₁ to 2 _7.

For example, when the 7-bit code data is all "1" as shown in FIG. 3, the AND gate array G
From ₁ outputs H level signal sequentially as shown in FIG. 3 (a) ··· (d) , are sequentially turned on totem pole buffer array Q, a light-emitting element 2 ₁ to 2 ₇ intended to sequentially emit light is there. In this case, the original pulse width is replaced with a group of small pulses P shown in FIG. 3, and the ratio of the pulse width S to one cycle, that is, the duty ratio is reduced to 1 or less of the number of the light emitting elements 2.

By the way, comparing the case where the light emitting element 2 is made to emit light continuously and the case where it is made to emit light by multi-pulse drive, in the latter case, the duty ratio is small.
The light emitting element 2 can be multi-pulse driven with a current several times as high as that in the case of continuous driving. In the present embodiment, instead of causing all the light emitting elements 2 to emit light at the same time, the light emitting time of one light emitting element 2, that is, the duty ratio, is determined.
1 or less. As a result, one light emitting source is composed of a plurality of light emitting elements 2 that emit light in a time division manner, and one light emitting element 2 is multi-pulse driven, that is, is driven in a time division manner. By using the multi-pulse modulation in which a large current is passed to increase the emission intensity, the distance between the transmitter 1 and the receiver 11 can be increased. That is, long distance transmission becomes possible.

In the case of FIG. 3, an interval K is provided between the small pulses P so that the adjacent small pulses do not change their frequencies continuously. The interval K
Can be, for example, the same as the width of a small pulse. In that case, it is only necessary to divide the pulse into small pulses, which is twice the number of pulses to be divided, and to set the bit data to “0” every other pulse, and to make only the remaining pulses valid. However, as shown in FIG. 4, there may be no interval between the adjacent small pulses P, and in that case, the same effect can be obtained.

Although FIGS. 3 and 4 show an embodiment of multi-pulse modulation in which one pulse is simply divided, FIG.
b, FIG. 5c, for example, multi-pulse modulation may be performed such that each bit of code data of a plurality of bits is assigned to the light emitting element 2. For example, the data to be transmitted is “11010001” (see FIG. 5b) 8
If bit code data is used, a simple multi-pulse modulation results in a group of small pulses having the same height as shown in FIG. 5a. However, as shown in FIG. 5c, the light emitting element 2 corresponding to bit data “1” is generated. ₁ , 2 ₂ , 2 ₄ , 2 ₈ emit light, and the light emitting elements 2 ₃ , 2 ₅ , 2 corresponding to bit data “0”
₆ and 2 ₇ do not emit light. The amplitude of the pulse indicates the modulated light emission intensity (modulated pulse current). After that, the light-emitting element 2 is controlled to emit light in a time-division manner in accordance with the code data. Therefore, even if the bit data is “1” continuously, the duty ratio of one cycle (one character) is 1 / the number of bits of the code data (1 / the number of light emitting elements) for each light emitting element. The emission intensity can be increased as compared with the case of continuous emission, and long-distance transmission can be realized.

In the above embodiment, each light emitting element 2 is made to emit light in a time division manner, but all the light emitting elements 2 may be made to emit light substantially simultaneously. In this case, the plurality of light emitting elements serve as one light emitting source, and it is possible to further increase the distance from the receiving device 11.
Similarly, long-distance transmission becomes possible. Further, as described above, it is preferable to dispose the light emitting element 2 so that the light receiving element 12 is at the focal position, but in some cases, the light emitting element 2 may be disposed so that the light emitting directions from the light emitting element 2 are substantially parallel. You can also

FIG. 6 is a schematic block diagram of an infrared data transmission system composed of a transmitter 1 and a receiver 11 for receiving the infrared multi-pulse modulated signal transmitted from the transmitter 1. In the figure, L is the above-mentioned transmission distance.
Here, S ₁ indicates code data, S ₂ indicates a multi-pulse modulation signal, and S ₃ indicates a transmission state of the infrared multi-pulse modulation signal. It should be noted that 9 in the transmitting device 1 of FIG. 6 indicates a light emitting unit including a plurality of light emitting elements 2.

The receiving device 11 receives the infrared beam B emitted from the transmitting device 1 and converts it into an electric signal S ₄ , and after amplifying the multi-pulse modulated signal converted by the light receiving device 12. The multi-pulse demodulation circuit 13 demodulates to the original level. The output of the demodulation circuit 13 is sent to a monitor or the like.
Note that an independent amplifier circuit may be provided before the demodulation circuit 13.

In this way, the infrared data transmission system is constituted by the transmitter 1 and the receiver 11, but as described above, since it is modulated into an infrared multi-pulse modulation signal and then emits and receives light, for example, It is not affected by electromagnetic induction or radio waves even when it comes close to power lines or power lines. Moreover, it is not easily affected by ultraviolet rays such as sunlight and fluorescent lights. That is, as long as the line of sight is clear, it is possible to construct an extremely reliable transmission line that is not affected by other devices and does not affect other devices.

Further, since the infrared data transmission system of FIG. 6 utilizes the straightness of infrared rays and utilizes the space itself as a communication medium, as shown in FIG. 7, for example, as shown in FIG. , 14 can be directly transmitted without using an electric wire or the like. An obstacle 15 is placed between the transmitter 1 and the receiver 11.
If so, the transmission path can be bent in the middle by using a mirror 17, as shown by an imaginary line 16 in FIG. 7.
When the mirror 17 is used, each light-emitting element 2 is connected to the light-receiving element 12 of the receiving device 11 in consideration of the bent portion.
It is necessary to dispose the light receiving element 12 at the focal position.

Next, referring to FIG. 8, a preferred embodiment of the infrared multi-pulse modulation repeater (hereinafter referred to as a repeater) of the present invention will be described. The repeater 19 shown in FIG. 8 has a receiver 20 that is substantially the same as the receiver 11 of FIG. 6, and a transmitter 21 that is substantially the same as the transmitter 1. That is, the receiving unit 20
Includes an infrared light receiving element 22 and a multi-pulse demodulation circuit 23, and the transmitting section 21 includes a multi-pulse modulating circuit 24 and a light emitting section 26 including a plurality of infrared light emitting elements 25. Then, the communication signal (code data) sent from the demodulation circuit 23 is configured to be sent to the modulation circuit 24 through a mixing unit 28 described later.

The repeater 19 configured as described above is arranged, for example, in place of the receiving device 11 of FIG.
The multi-pulse modulated signal in the form of a beam of infrared rays is transmitted through the light emitting section 26 including a plurality of light emitting elements 25, and the infrared signal is received by the receiving device 11 or the receiving section 20 of the next repeater. To do. As a result, the infrared rays attenuated by being transmitted through the distance L in the space of FIG. 6 are again amplified to the same level as that of the original transmission device 1 by the demodulation circuit 23 having an amplifying action, and a further distorted pulse waveform is obtained. It is shaped and transmitted to the receiving device 11 or the next repeater 19. Therefore, by sequentially arranging the repeater 19 of FIG. 8 on the transmission line, the transmission distance of the infrared multi-pulse modulation signal can be extended to the required distance without any limitation.

The repeater 19 shown in FIG. 8 has a function of amplifying and transmitting the received signal, and further inputs another transmission digital signal S ₆ to the modulation circuit 24 by branch input to time-division-multiplex the infrared digital signal. I am trying to transmit. In this case, it is necessary to shift the timings of the digital signal S ₇ sent from the previous stage and the digital signal S ₆ which is going to be branch-inputted in the repeater 19. In order to shift the transmission timings of two kinds of digital signals having different transmission sources in this way, a control line is provided separately from a line for transmitting a communication signal, as in a conventional transmission system using a cable. The transmitter control unit (see FIG. 6) is connected to the transmitter 1 and the repeater 19 by wiring.
No. 30) and a repeater controller (31 in FIG. 8) are provided, and a timing data signal for shifting the timings to each controller 30 and 31 is given through the control line to perform scanning.

However, this method requires two round-trip transmission lines for the communication signal transmission line and the control line, which complicates the structure and is not economical. Therefore, in the repeater 19 shown in FIG. 8, the mixing section 28 for sending out to the digital pulse modulation circuit 24 while automatically timing the both is connected.

The mixing section 28 temporarily latches the communication signal (code data) S ₇ received from the receiving section 20 of the repeater 19 and outputs the signal to the transmitting section 21 and the branch transmission signal. A transmission register 35 that temporarily stores a signal to be transmitted from the input terminal 34 and outputs the signal to the transmission unit 21 is provided. Furthermore, an incoming flag register 36 that sets a flag when a signal is latched in the incoming register 33 and a transmission flag register 37 that sets a flag when a signal to be transmitted is stored in the transmission register 35 are provided in each register 33. , 35
Incoming and outgoing register 33, 35
Is connected so that the flag registers 37, 36 of the other party can be accessed. Mixing unit 2 configured in this way
8 works as follows.

First, the incoming digital signal S ₇ amplified and demodulated by the demodulation circuit 23 of the repeater 19 passes through the line 29 and is temporarily latched in the incoming register 33. At that time, a flag is set in the incoming flag register 36, and the transmission flag register 37 is accessed to check whether the flag is set. When the flag is not set, the incoming signal S ₇ latched in the incoming register 33 passes through the transmission digital signal line 38 and is sent out as the infrared multi-pulse modulated signal S ₈ via the transmitting section 21.

When the flag is set in the transmission flag register 37, the branch signal S ₆ stored in the transmission register 35 is being transmitted, so the flag of the transmission flag register 37 disappears while being latched in the incoming register 33. Wait until. Then, when the flag disappears, the signal S ₇ is sent from the incoming call register 33 as described above, and is transmitted via the transmitting unit 21.

On the contrary, when the branch signal S ₆ is branch-transmitted from the repeater 19, the signal is first sent to the transmission register 3
Store temporarily in 5. At that time, a flag is set in the transmission flag register 37 and the incoming flag register 36
To see if it is flagged.
When the flag is not set, the transmission register 35
The branch signal S ₆ stored in the optical path is transmitted through the transmission digital signal line 38 to the infrared multi-pulse modulation signal S ₈
Sent out as.

When the flag is set in the incoming flag register 36, the incoming signal S ₇ is being sent from the incoming register 33, and therefore, the process waits until the flag in the incoming flag register 36 disappears while being stored in the sending register 35. Then, when the flag disappears, as described above, the transmission register 3
The branch signal S ₆ is sent out from 5 and sent via the transmission unit 21. In this way, the incoming signal S ₇ and the branch signal S ₆ are sent by the so-called time-division multiplex transmission method without any scanning by the control line while waiting for each other while the other party is sending out. .

Next, referring to FIG. 9, the above-mentioned transmitting device 1,
An embodiment of the infrared data transmission system of the present invention using the receiver 11 and the repeater 19 will be described. In the system of FIG. 9, the transmitter 1 of FIG. 6 is arranged at the head, the receiver 11 of FIG. 6 is arranged at the end, and a large number of repeaters 19 of FIG. 8 are arranged between them. Further, a transmission control unit 41 that sends a transmission signal to the modulation circuit is connected to the transmission device 1, and a mixing unit 32 is connected to each of the repeaters 19.
A reception control unit 42 is connected to the reception device 11. This device transmits a transmission signal S ₁ input from the input terminal 43 of the transmission control unit 41 of the transmission device 1 as an infrared multi-pulse modulation signal S ₃ and amplifies the signal by the repeater 19 which receives the signal as described above. Together with each mixing section 32
The signal is multiplexed with the branch signal S ₆ input from the input terminal 34 by the time division multiplex transmission method. Then, the multiplexed signal (S ₃ + S ₆ ) is sent again from the transmitter of the repeater 19 in a time division manner.

Similarly, the transmitted signal is amplified in the same manner one after another by the amount attenuated by the repeater 19 to the original level, the branch signal added by the repeater is time-division multiplexed, and finally the receiving device. 11 outputs the multiplexed signal from the output terminal 44 of the reception control unit 42. In such an infrared multiplex transmission system, for example, signals of an intrusion sensor, a door switch, a security camera, a fire alarm, etc. installed in many rooms are transmitted to the input terminal 43 of the transmission control unit 41 and the mixing unit 32 of the repeater 19. Input terminal 34
, And connect the output terminal 44 of the receiver 11 to the monitor or central control computer of the control room,
It can be used for security systems such as buildings.

The above-mentioned embodiment is, so to speak, a system for collecting information from a large number of detection terminals at one place. The infrared transmission system of the present invention, in addition to such collection, also provides control signals to a large number of operation terminals from one place. It can also be used when sending commands such as. The repeater used in such a centralized control system will be described below.

The repeater 51 shown in FIG. 10 receives the infrared multi-pulse modulation signal and amplifies the receiving section 20 which amplifies the received signal and the signal (address data) addressed to itself from the received light signal amplified to the original level. , A distribution circuit 52 for taking in communication data that follows, and an infrared transmitter 21 for transmitting the amplified received light signal as an infrared multi-pulse modulated signal. The receiver 20 comprises an infrared light receiving element 22 and a multi-pulse demodulation circuit 23 as in the case of FIG. The distribution circuit 52 reads, for example, a register 53 for temporarily storing a light reception signal, an identification signal such as address data set in advance from the stored digital signal, and communication data (control data) following the identification signal. Register 5 that temporarily latches
4 and a microprocessor 55 for controlling them. The infrared transmitter 21 includes a modulation circuit 24 for a multi-pulse signal, and a light emitting unit 26 having a plurality of light emitting elements 25.

This is, for example, a series of signal strings (packets) obtained by connecting a control signal section including the identification signal of the destination repeater 19 and a data signal of the content to be communicated from the transmitter 1 of FIG. A register 5 for sending out by a division multiplex method, separating a signal addressed to the repeater at each intermediate repeater 19, and latching the signal in the repeater, for example.
It is possible to send a command to the control unit of the machine tool that is connected via 4. Such an infrared transmission system can be used as a centralized control system for various automatic machines in a factory.

Note that the repeater 19 of FIG. 8 is replaced by the repeater 5 of FIG.
The distribution circuit 52 in No. 1 may be incorporated to provide a system capable of performing centralized control and centralized management at the same time. Further, in such a system, the receiving device and the light emitting device are combined and connected in a ring shape as a whole, or as shown in FIG. 11, the repeater 19 (and the mixing unit 32, the distribution circuit 52).
Can be connected in a ring shape to form an integrated infrared communication circuit. It is also possible to connect the second transmission unit 56 as shown in FIG. 12 to the output terminal of the distribution circuit 52 in FIG. 10 to form an infrared transmission line branched from the middle.

[0052]

According to the present invention, since the communication medium is infrared rays, it is possible to prevent malfunctions without affecting peripheral devices. Thereby, it is possible to construct a highly reliable infrared spatial data transmission line.

Further, according to the repeater of the present invention (Claim 1), the infrared multi-pulse modulated signal emitted from the infrared transmitter or the infrared repeater of the preceding stage is amplified to the original level and the signal is amplified. Since the infrared multi-pulse modulated signal is sent again in a different direction, the once attenuated infrared pulse modulated signal can be restored to the original level clear multi-pulse modulated signal. Therefore, by sequentially arranging the infrared repeaters on the transmission line, the infrared spatial transmission line can be configured almost infinitely up to the required transmission distance. Furthermore, a group of infrared light emitting elements and a group of them
Infrared light emitting elements are sequentially pulse-divided with multi-pulse modulation
Since it is equipped with a driving means to make it try to send
When the data is distributed to the infrared light emitting elements in one county
It emits light by dividing and sends one communication data as a whole.
I can believe. Therefore, the duty ratio is small
Since the load on each light emitting element is reduced,
It is possible to increase the drive current for each light emitting element.
Wear. Therefore, the emission intensity can be increased and the transmission
The distance can be lengthened. This is time division
Drive current does not increase as a whole. Well
In addition, a spherical concave surface so that the optical axes intersect toward the receiving unit
Since it has a group of light emitting elements arranged in the
Separate transmission is possible. Second mode of infrared repeater (claim
In item 2), a group of infrared light emitting elements emit light at the same time.
Since there is a driving means that makes it possible to
However, the amount of light can be extremely increased.
It Therefore, the transmission distance depends on the number of infrared light emitting elements.
Can be lengthened.

In the third aspect of the infrared repeater (claim 3 ), in addition to the infrared multi-pulse modulation signal sent from the infrared repeater one step before, a communication signal originating from itself is time-divided. The signals can be placed on the same transmission line and transmitted by the multiplexing method. Therefore, new data can be transmitted to an arbitrary destination in addition to the received data without causing the transmission line to be complicated.

In the fourth aspect of the infrared repeater (Claim 4 ), the infrared multi-pulse modulated signal is transmitted from one source to many destinations by the time division multiplexing method. Each infrared repeater that is transmitted to the terminal receives and selects the signal that it should receive. As a result, it is possible to construct a line for transmitting to a large number of receivers with only one transmission line. By combining the second aspect and the third aspect of the infrared repeater, it is possible to construct a so-called mesh-like transmission line network that transmits from a large number of transmission sources to a large number of destinations.

In the infrared multiplex transmission system according to the sixth aspect , the infrared transmitter, the repeater and the receiver do not adversely affect the surroundings and are not adversely affected by the surroundings, and are simple and easy to install and maintain. Transmission lines can be built.

[Brief description of drawings]

1a is a configuration diagram showing an embodiment of a transmitting device according to the present invention, and FIG. 1b is a front view showing an embodiment of a light emitting unit in the transmitting device according to the present invention.

FIG. 2 is a block circuit diagram showing an example of an electric circuit in the transmitting device according to the present invention.

FIG. 3 is an explanatory diagram showing an example of a case where a light emitting element in a transmitting device according to the present invention is driven by multi-pulse modulation in time division.

FIG. 4 is an explanatory diagram showing another example of the case where the light emitting element in the transmitting device according to the present invention is driven in a time division manner.

FIG. 5 is an explanatory diagram showing another example of a case where a light emitting element in a transmitting device according to the present invention is time-divisionally driven by multi-pulse modulation.

FIG. 6 is a plan layout view showing an embodiment of a transmission system using the infrared multi-pulse modulation transmitter of the present invention.

FIG. 7 is an elevational layout view showing an example of an inter-building communication transmission system using the infrared transmission system of the present invention.

FIG. 8 is an internal configuration diagram showing an embodiment of an infrared multi-pulse modulation / demodulation repeater of the present invention.

FIG. 9 is a plan layout view showing an embodiment of the infrared transmission system of the present invention.

FIG. 10 is an internal configuration diagram showing another embodiment of the infrared repeater of the present invention.

FIG. 11 is a plan layout view showing another embodiment of the infrared transmission system of the present invention.

FIG. 12 is a layout view showing still another embodiment of the infrared transmission system of the present invention.

[Explanation of symbols]

1 Infrared multi-pulse modulation transmitter 2 Infrared light emitting element 3 Support plate 8 Multi-pulse modulation circuit 9 Light emitting part 11 Infrared multi-pulse demodulation receiver 12 Infrared receiver 13 Multi-pulse demodulation circuit 19 Multi-pulse modulation / demodulation repeater 20 Receiver 21 Transmitter 28 Mixing section 52 distribution circuit

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI H04B 10/142 10/152 10/22 (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B 10/00-10 / 28 H04J 14/00-14/08

Claims (8)

(57) [Claims] 1. An infrared receiving unit for receiving and amplifying an infrared multi-pulse modulated signal by an infrared light receiving element, and multi-pulse demodulating into code data, and code data from this infrared receiving unit is again infrared multi-pulse modulated signal. and a infrared multi pulse modulation transmitter for transmitting as its infrared multi-pulse modulation originating device, to a receiving unit
Are arranged in a spherical concave surface so that the optical axes intersect.
Group of light emitting elements and the group of light emitting elements are sequentially time-divisionally multi-pulse changed.
An infrared multi-pulse modulation / demodulation repeater comprising a driving means for adjusting light emission and capable of restoring the infrared intensity attenuated by the transmission distance to the original intensity. 2. An infrared multi-sensor using an infrared light receiving element.
Receives the loose modulation signal, amplifies it, and multi-codes it to the code data.
The infrared receiver that performs pulse demodulation and the code data from this infrared receiver are sent to the infrared receiver again.
Infrared multi-pulse transmitted as multi-pulse modulated signal
Modulation transmitter and its infrared multi-pulse modulation transmitter are aimed at the receiver.
Are arranged in a spherical concave surface so that the optical axes intersect.
A group of light emitting elements and a group of light emitting elements that emit light substantially simultaneously.
The intensity of infrared rays attenuated by the transmission distance can be restored to the original intensity.
Infrared multi-pulse modulation and demodulation relay machine was set to kill. 3. Latch means for temporarily latching code data from the infrared receiver, input terminals for inputting the data, and storing means for temporarily storing the data input to the input terminals. The latched data and the stored data are mixed by time-division multiplexing, and the code data output from the mixing unit is transmitted as a multi-pulse modulation signal from the infrared multi-pulse modulation transmission device to receive the data. 3. The infrared multi-pulse modulation / demodulation repeater according to claim 1, wherein new data can be transmitted to any destination in addition to the above-mentioned data. 4. A distribution circuit for identifying its own address data from the data converted by the infrared receiving unit and taking in communication data following the address data, so that it is possible to receive transmissions addressed to itself from a large number of transmission sources. Claim 1 or
2. The infrared multi-pulse modulation / demodulation repeater according to 2 . 5. Latch means for temporarily latching code data from the infrared receiver, input terminal for inputting the data, and storing means for temporarily storing the data input to the input terminal, A mixing unit for outputting the latched data and the stored data in a time division manner; and a distribution circuit for identifying its own address data from the data converted by the infrared receiving unit and fetching communication data following the address data, By transmitting the converted data from the infrared multi-pulse modulation transmission device as a multi-pulse modulation signal, it is possible to receive transmissions addressed to itself from a large number of transmission sources, and to add new data in addition to the received data. 3. The infrared multi-pulse modulation / demodulation repeater according to claim 1, wherein the infrared multi-pulse modulation / demodulation repeater can be transmitted to a large number of destinations. 6. A infrared multi-pulse modulation transmitter consists of an infrared multi-pulse demodulator receiving apparatus, as defined in Claim 1, 2, 3, 4 or 5, wherein the infrared multipulse modem repeater is interposed therebetween Infrared data transmission system. 7. An infrared data transmission system in which the infrared multi-pulse modulation / demodulation repeaters according to claim 3, 4 or 5 are arranged in a ring shape. 8. An infrared data transmission system in which the infrared multi-pulse modulation / demodulation repeaters according to claim 3, 4 or 5 are arranged in a mesh pattern.