JP2003108942A - Non-contact communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a detection area of a non-contact IC card constant by a reader/writer in a non-contact IC card system, for example. SOLUTION: In the reader/writer constructed by connecting a communication processing part and an antenna together via a cable, a signal transmitted without any contact from the non-contact type IC card is received via the antenna and inputted to the communication processing part via the cable, and the communication processing part detects data based on a multiplication result of the inputted receipt signal and a signal having the same frequency as the carrier wave frequency of the receipt signal. In this process, a cable phase change quantity correcting means shown in a figure gives a phase changing quantity to a signal transmitted through the cable for correcting the phase change quantity given by the cable so that a detection level of the data based on the multiplication result in the communication processing part reaches a predetermined level.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type IC car.
Contactless communication devices such as reader / writer devices
In particular, the detection of data from non-contact IC cards, etc.
For non-contact communication devices capable of adjusting the output level
You. [0002] For example, in a non-contact type IC card system
Is a reader / writer (R / W) device used as an interrogator
And a contactless IC card used as a transponder
Non-contact power transmission and data communication are performed between
You. As an example, the reader / writer device has a loop-shaped
Transmit power to contactless IC card using tena
Function and the contactless IC card using the antenna.
To communicate information between the non-contact type IC card
It has a function of reading and writing contents stored in a memory. Ma
In addition, a non-contact type IC card has a power supply inside, for example.
There is no memory to store information or a loop antenna
A function of receiving power from a reader / writer device using
A reader / writer using the antenna with the received power
It has a function of communicating information with the device. In such a non-contact type IC card system,
Is non-contact using electromagnetic induction from a reader / writer device
Contactless power is transmitted to the IC card
It operates using the power received by the IC card, and
The reader / writer device and the non-contact type IC card
It communicates information by touch. By the way, a conventional non-contact type IC card system
In most cases, the reader / writer
Communication processing unit having a communication processing unit for performing wireless communication processing
Unit and one antenna unit having an antenna
One to one. For this reason, the conventional reader / writer
In the arrangement, for example, as shown in FIG.
Communication processing with antenna unit 21 having antenna A2
And a communication processing unit 22 having a unit.
Or, as shown in FIG.
An antenna unit 31 having an antenna and a communication processing unit
The distance to the communication processing unit 32 is fixed.
These two units 31, 32 are connected via a cable 33
A configuration to be connected was used. In such a configuration of the reader / writer device,
Communication between the antenna of the antenna unit and the communication processing unit
The distance to the signal processing unit is constant or almost constant.
For example, antennas used for wireless communication
The design only needs to be considered in consideration of the wave number characteristics.
Adjusting the phase of the signal is not considered at all.
Did not. However, for example, an antenna unit or
This depends on the location where the communication processing unit is installed, etc.
The length of the cable connecting the two units
If you need to change it, or
What is a one-to-one combination of a unit and a communication processing unit?
It may not be. In such a case,
Inability to standardize the length of the bull to a certain length
Between the antenna of the reader / writer device and the communication processing unit.
The distance between them is not constant. Here, two specific examples in the above case are described.
Show. First, as a first specific example, a game using a distributor is described.
The figure shows the case of a reader / writer device using a
You. FIG. 4 shows a gate type of such a reader / writer device.
An example of the configuration of an antenna and the like is shown.
A first antenna unit having a first antenna A4
And a second antenna A5 having a loop-shaped second antenna A5.
2 antenna unit 42 and a communication processing unit (FIG.
(Not shown) to split the signal (power signal and information signal) into two
And a distributor 43 that performs
The signal is supplied to the antenna A4 of the first antenna unit 41.
And the distributed cable 44
The other signal is sent to the antenna A of the second antenna unit 42.
5 and a distributor 4 for supplying to the
3 and the cable 46 connecting the communication processing unit
Is shown. In the gate type antenna shown in FIG.
For example, the magnetic field from the second antenna A5 to the first antenna A4
With the direction, the signal output from the distributor 43 is the first
Transmitted from the antenna A4 and the second antenna A5,
As a result, the first antenna unit 41 and the second antenna
Non-contact type IC that passes through a gate between
Supply contactless power to a card (not shown)
Non-contact communication of information with the non-contact type IC card
You. With such a gate type antenna, almost all
In any case, the function of the distributor 43 is
Configuration incorporated in the housings of the base units 41 and 42
Is used, in such a case, from the distributor 43
The distance between each antenna A4 and A5 is different
The length of each cable 44, 45
Will be different. Next, as a second specific example, the antenna switching
Reader / writer using a shelf-type antenna using a device
The device is shown. FIG. 5 shows such a reader / writer device.
A configuration example of a shelf antenna or the like is shown. Specifically,
An antenna is provided on each shelf of the bookshelf unit J.
A plurality of shelf-type antennas 51a, 51b and a reader / writer
Communication processing unit 53 and the communication processing unit
Shelf for connecting signals (power signals and information signals) from
Perform switching between the antennas 51a and 51b.
An antenna switching device 52;
A plurality of cables for connecting the respective shelf-type antennas 51a and 51b.
Bullets 54a and 54b and books H stored on each shelf
is there. In FIG. 1, a plurality of shelf antennas are shown.
The reference numerals are assigned to only a part 51a and 51b of
Also, only some of the cables 54a and 54b
And a sign is shown, and a part H in a plurality of books is shown.
Although only the reference numerals are shown for bookshelf unit J,
For example, each shelf is configured as a shelf antenna
A cable is provided for each of these shelf-type antennas.
And a plurality of books are stored on each shelf. In the shelf antenna shown in FIG.
Each book H has the function of a non-contact IC card
And using the respective shelf-type antennas 51a and 51b.
Books (non-contact type IC card) H stored in each shelf
It communicates power and information without contact between
At this time, the communication processing unit is controlled by the antenna switching device 52.
A shelf type antenna 5 for outputting a signal from the unit 53, etc.
Switching between 1a and 51b is performed. In such a shelf antenna, the antenna
From the replacement device 52 to the respective shelves (shelf antennas 51a,
Since the distance to 1b) is different,
Cables 54a and 54b have different lengths. [0014] As shown in the above conventional example,
The reader / writer of the conventional non-contact IC card system
In the monitoring device, the antenna unit and the communication processing unit
If the length of the cable connecting the
Union occurs. And with a conventional reader / writer device
Due to cable length differences
Signal given by the cable
Since the amount of phase change differs,
Data received from non-contact type IC card by iter device
There is a problem that the detection level of
For this reason, for example, a non-contact IC
Area where contactless communication can be performed by detecting the card
(Detection area of non-contact type IC card) fluctuates
There was such a problem. The present invention solves such a conventional problem.
This is for connecting the communication processing unit and the antenna.
The cable used to connect
Correct the amount of phase change given to the transmitted signal
Mobile information communication such as non-contact IC cards
Adjust the detection level of data from the body to a predetermined level
This allows, for example, the detection of mobile information
Reader / writer device that can stabilize the area
It is an object of the present invention to provide a non-contact communication device such as the one described above. [0016] To achieve the above object,
Therefore, in the contactless communication device according to the present invention, the communication processing unit and the
Connected to the antenna via a cable.
The signal transmitted from the broadcaster without contact is transmitted by the antenna.
Receives the data and inputs it to the communication processing unit via a cable.
The received signal and the carrier of the received signal
Based on the result of multiplication of the frequency with a signal having the same frequency
When detecting data, use the following
The phase change amount of the signal transmitting the signal is corrected. That is,
The cable phase change amount correcting means is provided in the communication processing unit.
The detection level of data based on the multiplication result is a predetermined level
So that the signal transmitted through the cable
Cable to compensate for the amount of phase change
A phase change amount is given to the signal. Therefore, for a signal transmitted through a cable,
The position given to the signal by the cable
Given a phase change amount for correcting the phase change amount,
Detection of data based on the multiplication result in the communication processing unit
Since the level is adjusted to a predetermined level, mobile information communication
Adjust the detection level of data from the body to a predetermined level
This allows, for example, the detection of mobile information
The area can be fixed. Here, as the non-contact communication device, for example,
Various devices such as a reader / writer can be used.
You. Various devices are used as mobile information communication bodies.
For example, self-identification information may be stored in a memory.
IC card can be used.
A device such as a tag that stores its own identification information in memory
Can also be used. The communication processing unit has various configurations.
Things may be used. Also, as an antenna,
For example, various antennas such as loop antennas are used
Is also good. Also, as the cable, for example, a coaxial cable
For example, various cables may be used. In addition,
As tactile communication, for example, communication using electromagnetic induction
Can be used. [0020] Also, for example, moving information from a non-contact communication device is transmitted.
The carrier of the signal (transmission signal) to be transmitted to the communication body is the movement information
The communication body modulates and sends it back to the contactless communication device as a response signal
In such a configuration, the signal input to the communication processing unit (receiving
Signal) is the carrier of the transmission signal output from the communication processing unit.
It becomes a signal modulated by the mobile information communication body, and the transmission signal
It has a carrier wave of the same frequency as
The signal changes phase. The same frequency as the carrier frequency of the received signal is used.
As a signal having a wave number, for example, a carrier frequency of a transmission signal is used.
If the wave number and the carrier frequency of the received signal are the same,
The transmitted signal can be used as it is,
Further, another signal may be used. The data based on the multiplication result is transferred.
Data transmitted from the mobile information communication device to the contactless communication device.
Data, for example, frequency components included in the multiplication result.
Is removed by a filter and the remaining constant component is
Is detected. Mobile information communication body
In information communication with non-contact communication devices, for example,
Modulation method such as key modulation is used.
The value of the data based on the result of the multiplication changes. Also, data detection based on the multiplication result
Level (value of the data) is the signal transmission including cable
Path to the signal transmitted through the signal transmission path.
Depending on the amount of phase change, and in some cases,
The detection level is always zero or very low
Something goes wrong. Also, such a phase change amount
Effects are usually highly dependent on cable length
You. Therefore, in the present invention, for example, based on the length of the cable,
In order to correct such a phase change amount,
The detection level by giving an amount to the signal
To adjust. Also, data detection based on the multiplication result
The predetermined level for which the level is to be adjusted
Various levels may be used, for example, "below a predetermined threshold.
Any level above may be used, and a "predetermined threshold
May be used, and any level above
A "constant level" may be used, and "a predetermined constant range".
Any level within the box "may be used. Specifically
If the detection level is increased, detection of mobile information
Output area can be enlarged, and the detection level
The detection area of mobile information communication objects
can do. Also, as a cable phase change amount correcting means,
Gives the amount of phase change to the signal transmitted through the cable.
If it can be obtained, various things are used
For example, a capacitor with variable capacity
It can be configured by using a semiconductor device. Also the cable
The phase change amount correction means is provided in various places.
For example, near the connection end between the cable and the antenna
Near the connection end between the communication processing unit and the cable,
For a part of the file. In the following, the principle of the present invention will be explained logically.
You. In the following, the non-contact communication device according to the present invention will be described.
Mobile information communicator is applied to non-contact type
An example in which the present invention is applied to a C card will be described. First, the reader
Wireless communication between writer device and non-contact type IC card
A specific example of communication will be described. FIG. 6 (a) shows a general
Example of schematic configuration of reader / writer device and non-contact type IC
A card 64 is shown. The reader / writer device
Tenor (antenna unit) 61 and communication processing unit 6
2 are connected via a cable 63. communication
The processing unit 62 is wirelessly connected using the antenna 61.
As a circuit for transmitting and receiving signals, a transmission circuit 71 and a
A lance 72, a detection circuit 73, and a reception circuit 74 are provided.
Have been. In the configuration shown in FIG.
Transmission signal output from 1 (here, referred to as B signal)
Is output to the cable 63 via the transformer 72,
Wirelessly transmitted from the antenna 61 via the cable 63
Received by the contactless IC card 64
You. On the other hand, the non-contact type IC card 64 has a reader / writer device.
It operates using the power supplied from the
The carrier of the B signal received from the device to the load switch, etc.
By further modulating, the B signal is applied to the reader / writer device.
And transmit the modulated B signal.
Non-contact return from antenna to reader / writer device
You. In such a configuration, a non-contact type IC card
The frequency of the carrier wave modulated by 64
Frequency of the signal (B signal) received from the device
From the reader / writer device, the contactless IC card 6
Carrier used in wireless communication to the PC (reader / writer device)
Transmission carrier wave) and the frequency of the contactless IC card 64
Carrier used in wireless communication from the PC to the reader / writer device
(Reception carrier wave of the reader / writer device). A response signal from the non-contact type IC card 64
The B signal transmitted as a signal is received by the antenna 61.
And enters the communication processing unit 62 via the cable 63.
And the communication processing unit 62
The signal is input to a detection circuit 73 as a reception signal via a signal 72.
You. At the same time, in the communication processing unit 62,
The transmission signal output from the transmission circuit 71 (here, the A signal
) Directly via the transformer 72
Is input to In the detection circuit 73, the input A signal and
Detection is performed based on the B signal.
Detects data received from the non-contact type IC card 64.
Is done. FIG. 6 (b) shows a general reader
Another example of the schematic configuration of an iter device and a non-contact IC car
84. The reader / writer device has an antenna
(Antenna unit) 81 and communication processing unit 82
Are connected via a cable 83. Communication processing
Unit unit 82 wirelessly using an antenna 81
A signal transmitting and receiving circuit includes a transmitting circuit 91 and a capacitor.
A sensor 92, a detection circuit 93, and a reception circuit 94.
Have been. Here, the configuration and operation shown in FIG.
In the communication processing unit 82 shown in FIG.
A capacitor 92 is provided in place of the transformer 72
The transmission signal from the transmission circuit 91
Output directly to the cable 83 without any intervention
A detection signal is received from the signal 84 via the capacitor 92.
Except that it is input to 93, for example,
This is the same as the configuration and operation shown in FIG. Next, a description will be given with reference to FIGS. 6 (a) and 6 (b).
Communication processing unit in wireless communication as described above.
The data detection level will be described. The antenna unit
Length of the cable connecting the communication unit and the communication unit
X, and the reader / writer device and the non-contact type IC car
The frequency used for wireless communication with the PC is a proximity IC card
13.56 [MHz] which is the international standard of
You. For example, the transmission carrier frequency and the reception carrier
If the frequency is the same, the communication processing unit
Is an A signal input as a wraparound of a transmission carrier,
Mixing (synthesis) with the B signal which is the signal of the received carrier wave
Is done. Thus, the signal that appears in the detection circuit on the receiving side
Is an A signal whose transmission signal is directly transmitted to the receiving side,
B where the transmission signal is folded back from the non-contact type IC card
And the signal. Here, the A signal a sent to the receiving side is expressed by the following equation.
1 and the B signal b is expressed as shown in Equation 2.
You. A indicates the amplitude of the A signal, and ω indicates the transmission carrier spread.
And the angular frequency of the received carrier, where λ corresponds to ω
The wavelength indicates the time, and t indicates the time. B represents, for example,
If the tactile IC card is in a fixed position
And uses a transmission signal (A signal) from the reader / writer device.
Response signal from the contactless IC card (B
Signal) until the signal reaches the receiver.
You. Α is the phase of the response signal (B signal).
If there is a phase change in a non-contact IC card
The amount that changes fixedly due to phase changes in the line
Show. Note that α is a position caused by the cable length x.
Phase change is not included. ## EQU1 ## ## EQU2 ## The A signal a and the B signal b are combined.
The signal (combined signal) Y is expressed as shown in Expression 3. ## EQU3 ## Here, the composite signal shown on the rightmost side of the above equation (3)
The component of the second term of the signal Y is a signal having an angular frequency (2ω).
Removed by the filter provided in the receiver circuit
Only the component of the first term, which is a few components, remains, and after the removal,
The composite signal Y ′ is expressed as shown in Expression 4. [Equation 4] Further, the synthesized signal Y ′ after the filter is removed is indispensable.
The absolute value Z = | Y ′ |
It is represented as shown. [Equation 5] Here, when the length x of the cable changes,
The phase change amount (4πx) / λ in the above equation 5 changes.
As a result, the value of the absolute value Z shown in Expression 5 changes. What
Note that the phase of the A signal a into which the transmission signal wraps depends on the component arrangement
Value is fixed depending on the parameter and pattern, etc., and omitted here
I have. However, the phase of the B signal b which is the received signal is
The length of the cable x and the antenna of the reader / writer
It changes depending on the distance from the contact type IC card, etc.
You. In this regard, the frequency used for wireless communication is
Free space when 13.56 [MHz] as in
Wavelength is about 22m, proximity type non-contact IC car
Communication distance is within about 40 cm.
In the case, the antenna of the reader / writer device and the non-contact type IC
The distance to the card is only a fraction of the wavelength.
The distance does not change.
The effects are very small and can be ignored. On the other hand, the communication processing of the reader / writer device
Cable provided between the control unit and the antenna unit.
The cable length x is, for example, 10 m or less depending on the installation location.
This effect can be very large because it can be
Cannot be ignored. FIG. 7 shows that the non-contact type IC card has the same position.
Reader / writer
Detected by the receiving circuit of the communication processing unit of the device
Received signal level (combined signal Y 'after removing the filter)
The absolute value Z of the cable) changes in accordance with the change in the cable length x.
This is an example of how the
Value. The horizontal axis of the graph in the figure is the cable
The vertical axis indicates the relative received signal level.
Indicates a bell. As shown in FIG.
Even if the C card is in the same position, the cable length x
Received signal level changes accordingly, causing non-contact IC
The detection area of the card becomes wider or narrower
No, if it can and cannot be received normally
Will occur. Also, depending on the cable length x
Is received at all times because the received signal level is always zero.
May not be able to detect communication data
appear. In the calculation, the cable length x
Non-contact type IC card is detected at a period of (λ / 4)
The cable wavelength
Considering that the shortening rate is about 67%, about 3.7
The received signal level drops every [m]. FIG. 8 shows a cable obtained by an actual experiment.
In various cases where the length x of the
The received signal from the non-contact type IC card
Of the reader / writer device when the
Maximum distance between antenna and contactless IC card (maximum detection
Distance). The horizontal axis of the graph in the figure is the case
And the vertical axis indicates the maximum detection distance.
[Mm]. In the measurement results shown in FIG.
Non-contact IC card with antenna and transmission circuit side of device
Is not shown in FIG.
Although there is some variation compared to the calculated results,
The period in which the maximum detection distance decreases for a small length x
Is almost the same as the calculation result shown in FIG.
In other words, the detection area is
(Maximum detection distance) becomes wider or narrower
Is shown. In the measurement shown in FIG.
Impedance matching of non-contact IC
Complete impedance matching inside the board
Is very difficult, and such impedance matching
If completely obtained, for example, as shown in the calculation result of FIG.
The place where the maximum detection distance drops is markedly around (λ / 4).
Period. As described above, in the conventional reader / writer device,
Is the case, for example, when using the same antenna.
Even if the cable length changes, a non-contact IC card
There is a problem that the detection area of
Was. Therefore, in the present invention, such a cable is transmitted.
The amount of phase change for correction
For example, a non-contact type IC card
To achieve a fixed detection area
I do. Incidentally, for example, Japanese Patent Application Laid-Open No. 8-162818
And JP-A-8-116276 and JP-A-8-293.
No. 725, JP-A-2001-60841 and JP-A-2001-60841.
Japanese Patent Application Laid-Open No. 11-145852 discloses a mobile phone and the like.
To provide an impedance matching circuit
However, the present invention provides such impedance matching.
It is not intended to be
To improve the level of detection of received data and to detect mobile information
The purpose is to improve the exit area, especially in non-contact
Type IC card system
Things. In addition, in general, ordinary mobile phones
Is different from the frequency of the transmitting carrier and the frequency of the receiving carrier.
And receive data using a filter in the receiving circuit.
The signal and the transmission signal are separated. As described above, the phase change amount according to the present invention is
Adjustments are not intended for impedance matching.
Data from mobile information communicators using contactless communication devices
Can always be received at a stable level
It is. For example, the measurement result shown in FIG.
If you change the cable length, the cable
Peak corresponding to when the length x of the bull is 6 [m]
Data can be received at the (maximum) signal level, etc.
Can be adjusted. That is, for example,
The length of the cable actually used depending on the location
Cable length, always
Can be adjusted so that they look the same
It is something. Embodiments of the present invention will be described with reference to the drawings.
It will be described in the light of the above. In this example, the non-contact type according to the present invention is used.
Mobile information communication consisting of communication device and mobile information communication body
When the body system is applied to a contactless IC card system
The reader / writer device is used as the non-contact communication device.
Using a non-contact IC card as a mobile information communication body
You. The configuration and operation of the reader / writer device of this embodiment
The operation is, for example, with the antenna unit and the communication processing unit.
To correct the signal transmitted through the cable connecting the
That it has a phase circuit that gives the amount of phase change
Is the same as the configuration and operation shown in the conventional example, except for
Yes, in this example, a detailed description of the similar parts
Is omitted. In addition, the configuration of the non-contact type IC card
The operation is the same as, for example, the configuration and operation shown in the conventional example.
Therefore, in this example, detailed description is omitted. FIG. 1 shows a configuration of the reader / writer of this embodiment.
The configuration example of the phase circuit shown in FIG.
A phase circuit is provided in the antenna unit. Soshi
Connected to the cable from the communication processing unit
The transmission signal for the tactile IC card is transmitted through the cable.
After passing through the phase circuit,
Output from the antenna to the non-contact type I
It is transmitted to the C card without contact. On the other hand, non-contact type
The signal transmitted from the IC card without contact is sent to the antenna
After passing through the phase circuit, and then
Output from phase circuit to cable and transmit the cable
Then, it is input to the communication processing unit as a reception signal. As shown in FIG. 1, the phase rotation of this embodiment is
There are two paths on one line along the signal transmission direction.
Coils 1 and 2 are connected in series, and these two coils
One end of capacitor 3 and trimmer capacitor between 1 and 2
4 and the other line is connected to the capacitor
3 and the other end of the trimmer capacitor 4
It is configured. Transmit between cable and antenna
The signal is, for example, as a voltage signal between these two lines
The phase circuit of this example is transmitted. The capacitance of the trimmer capacitor 4 changes.
It has a function that can be
Manual or control from the communication processing unit of the reader / writer device,
By external control other than the reader / writer device,
The capacity can be adjusted. G
When the capacity of the lima capacitor 4 is changed,
Phase given to the signal transmitted through the phase circuit
The amount of change in
Is given to the signal by the phase circuit.
The amount of phase change to be performed can be adjusted. As another example, FIG.
Arbitrary among multiple phase circuits that give different amounts of phase change
Phase circuit and antenna unit are for cable connection
The structure of the connector part etc. provided in the antenna unit
Shows an example of the configuration of a removable reader / writer device.
I have. More specifically, FIG.
Antenna unit 11 having A1 and one end performing communication processing
A cable 12 connected to an external unit (not shown);
The other end and one end of the cable 12 are connected and
Shows the antenna A1 and the phase circuit 13 to which the other end is connected.
The phase circuit 13 is provided in the antenna unit 11.
Attached to the antenna unit 11 with the connector
Have been killed. The phase circuit 13 is described above.
If multiple phase circuits with various phase change characteristics are used,
Is intended. Then, the antenna unit 11 and any
Replacement with the phase circuit 13 in the connector section
Which allows, for example, the length of the cable 12
Phase circuit 1 having the characteristic of the optimal phase change amount according to
3 is arbitrarily selected to connect the phase circuit 13 to the antenna unit.
By attaching to cable 11, cable 12 and antenna
Phase change given to the signal transmitted between
The amount of conversion can be optimally corrected. As described above, in the reader / writer device of this embodiment,
Is an antenna unit having an antenna and a communication processing unit.
Connected to the communication processing unit via a cable
The communication processing unit uses an antenna to make a non-contact type IC card.
In a configuration that performs power transmission and information communication with the
The transmission signal to the C card or the contactless IC card
Phase response to the signal path through which the response signal (received signal) is transmitted.
Path, and connect the phase
By adjusting the amount of phase change due to the
Signal from a non-contact type IC card (received data
Data) should be kept above a certain level.
As a result, the detection area of the non-contact type IC card is
Can be kept in a certain range or more. Specifically, for example, one communication processing unit
To fit multiple antennas in each installation space, etc.
Connection using a coaxial cable of the optimal length
In such a case, the approach cable for the antenna
Regardless of the length of the coaxial cable
To ensure a constant received signal level,
For example, a detection area can be secured. So, for example,
For example, conventionally, a plurality of antennas are provided for one communication processing unit.
If you use an antenna that requires the longest cable,
Connect the longest cable to all antennas
To use the same detection area.
However, in this example, different antennas
Length of cable can be used. Also, this example
With a phase circuit on the antenna unit side
Now, for example, the configuration of the receiving circuit on the communication processing unit
This is preferable because the configuration and operation can be unified. Here, in the reader / writer device of this embodiment,
For example, as described with reference to FIG.
If the wave number and the frequency of the received carrier are the same,
, The received signal (B signal) from the non-contact type IC card
Signal) and the same frequency as the carrier frequency of the received signal.
Is multiplied (combined) with the transmission signal (A signal)
Data based on the result of the multiplication (the total
The absolute value Z of the formed signal Y ′) is detected. In this example, the signal transmitted through the cable
Of phase circuit to give phase change amount for correction
Function constitutes a cable phase change amount correcting means.
You. And, by this function, the signal transmitted through the cable
For example, given according to the length of the cable
The phase change amount can be corrected. In this example,
Is, for example, the transmitting circuit 7 in the configuration shown in FIG.
1, from the transformer 72, the detection circuit 73, and the reception circuit 74.
A communication processing unit is configured, for example, as shown in FIG.
In the configuration described above, the transmission circuit 91, the capacitor 92, the detection circuit
A communication processing unit includes the receiving circuit 93 and the receiving circuit 94. In this example, the router of the reader / writer device
Antenna and loop antenna of non-contact type IC card
The configuration for more power transmission and information transmission / reception has been described.
For example, a power supply can be provided inside a non-contact IC card.
In such cases, the non-contact type I
Power transmission to the C card need not be performed. Here, the mobile information communication system according to the present invention
System, contactless communication device, mobile information communication body, etc.
Are not necessarily limited to those shown above.
Configuration may be used. In addition, as an application field of the present invention,
Is not necessarily limited to the above, and the present invention provides
It can be applied to various fields. Further, in the non-contact communication device according to the present invention, etc.
The various processing performed in, for example, the processor
Processing on hardware resources with
The control processor stored in the ROM (Read Only Memory)
The configuration controlled by executing the program is used
For example, each device for executing the process.
Function means are configured as independent hardware circuits,
Good. Further, the present invention stores the above control program.
Floppy (registered trademark) disks and CDs (Compact Dis
c)-A record that can be read by a computer such as a ROM
It can be grasped as a recording medium or the program itself.
The control program can be transferred from a recording medium to a computer.
Input to the processor and executed by the processor.
Can be performed. As described above, according to the present invention, the non-contact
According to the tactile communication device, the communication processing unit and the antenna
Connected via a mobile information communication body.
The signal transmitted by touch is received by the antenna and the cable
Input to the communication processing unit via the
Received signal and the same frequency as the carrier frequency of the received signal
Detects data based on the result of multiplication with a signal having a wave number
At the time of communication based on the multiplication result in the communication processing unit.
Make sure that the data detection level is at the specified level.
Signal transmitted by the cable
The amount of phase change for correcting the amount of phase change
For mobile information communication
It is possible to adjust the data detection level to a predetermined level.
This allows, for example, detection areas for mobile information
Can be constant.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration example of a phase circuit according to one embodiment of the present invention. FIG. 2 is a diagram illustrating a configuration example of a reader / writer device in which a phase circuit is detachable from an antenna unit. FIG. 3 is a diagram illustrating a configuration example of an antenna unit and a communication processing unit of the reader / writer device. FIG. 4 is a diagram illustrating a configuration example of a gate antenna using a distributor. FIG. 5 is a diagram illustrating a configuration example of a shelf-type antenna using an antenna switching device. FIG. 6 is a diagram illustrating a configuration example of a communication processing unit (transmission / reception circuit unit) of the reader / writer device. FIG. 7 is a diagram illustrating an example of a change in a received signal level due to a change in a cable length. FIG. 8 is a diagram illustrating an example of a maximum detection distance of a non-contact type IC card when a cable length is changed. [Explanation of symbols] 1, 2, coil, 3, 92, capacitor, 4.
-Trimmer condenser, 11-Antenna unit, 1
2, 63, 83 ... cable, 13 ... phase circuit, A
1, 61, 81 ... antenna, 62, 82 ... communication processing unit, 64, 84 ... non-contact type IC card, 7
1, 91... Transmission circuit, 72... Transformer, 73, 9
3 ・ ・ Detection circuit, 74, 94 ・ ・ ・ Reception circuit,

   ────────────────────────────────────────────────── ─── Continuation of front page    F term (reference) 2C005 NA08 TA22                 5B035 BB09 CA23                 5B058 CA15 KA24                 5K012 AB05 AC06 AD05

Claims (1)

Claims 1. A communication processing unit and an antenna are connected via a cable, a signal transmitted from a mobile information communication body in a non-contact manner is received by the antenna, and the signal is transmitted through the cable. A non-contact communication device that inputs to a communication processing unit, and the communication processing unit detects data based on a multiplication result of the input reception signal and a signal having the same frequency as a carrier frequency of the reception signal, The phase change amount for correcting the phase change amount given by the cable with respect to the signal transmitted through the cable is set to the signal so that the detection level of the data based on the multiplication result in the processing unit becomes a predetermined level. A non-contact communication device comprising a cable phase change amount correcting means provided to the communication device.