JPH1168645A - Radio guidance system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exact guide message by precisely limiting an area even when the guide area is narrow and proximate by identifying whether it is present inside the guide area or not while utilizing the phase invertion of a guide code caused by a difference in the direction of a magnetic field inside/outside a loop antenna. SOLUTION: A loop antenna 20 laid over the floor of a guide path for partitioning the prescribed guide area is connected to transmission equipment 30. An ID generating part 32 supplies a binary combination signal corresponding to each guide area to a transmission part 24 as a guide ID code so that the loop antenna generates a magnetic field corresponding to the guide ID code in each guide area at prescribed time intervals. Portable reception guide equipment 40 detects the magnetic field prepared by the loop antenna 20 through a reception antenna 28, receives the guide ID code (10110, for example,) inside the loop antenna 20 or receives the inverted guide ID code (01001) outside the loop antenna and can surely identify whether it is inside or outside the loop antenna.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a radio guidance system,
In particular, the present invention relates to limiting a guide area of a wireless guide system that lends a portable reception guide device to a user in a museum or an art museum, and performs display guidance in each guide area using guided wireless communication.

[0002]

2. Description of the Related Art In a museum or the like, an exhibition guide using a portable reception guide device can provide a user with necessary guidance each time while keeping the inside of the building quiet. It is widely used because of its advantages such as easy selection of the guide language and easy change of the contents of the guide according to the exhibits. Such a portable reception guide device is lent to the user and moves with the user, and when approaching the periphery of the exhibit and entering a predetermined guidance area, the guidance of the corresponding exhibit is displayed by the portable reception guide. It is mainly output as audio from the device. In a guidance system using this type of wireless communication, a guidance area is limited by radio waves or infrared rays, and guidance determined in each guidance area is performed corresponding to an exhibit.

In a classic guidance system, a message adapted to each guidance area has been transmitted from a transmission device.
This method has a disadvantage that the user often listens to the guidance message from each guidance area from the middle. In order to eliminate such disadvantages, for example, Japanese Patent Application No.
In the case of -72068 and the like, the transmission device simply outputs I
A system in which only the D code is transmitted is proposed. According to this improved device, the transmitting device simply transmits only the ID code corresponding to the guidance area. On the other hand, the portable reception guide device has a memory in which all the guide messages of the necessary guide area are stored, and reads out the corresponding guide message from this memory by the transmitted ID code and provides the user to the user each time. . According to this improved device, the user can listen to the corresponding message from the beginning when entering each guidance area, and if the guidance area is changed, the guidance message corresponding to the new guidance area again. Can be heard from the beginning.

[0004]

However, even with this improved device, there is a problem that if the boundaries of the respective guide areas are ambiguous, the user cannot receive guides suitable for the respective exhibits. there were. In particular, when the area is limited by radio waves, the ID codes of a plurality of adjacent guide areas are often mixed, and the user faces the inconvenience of listening to the adjacent guide.

Conventionally, it has been studied to strictly divide the guide area by using infrared rays instead of radio waves and utilizing the straightness of the infrared rays. FIG. 5 schematically shows an example. In this figure, an infrared light emitting (transmitting) device 10 for transmitting an ID code a to a certain guide area is provided, and another infrared light emitting (transmitting) device 12 for transmitting an ID code b to another guide area adjacent thereto. Is provided. As a result, the ID code a and the ID code b are transmitted to each of the illustrated areas partitioned by infrared rays as the guide areas. Therefore, according to this device, when a relatively small guide area is provided indoors, each guide area can be clearly defined. On the other hand, when the guide areas are close to each other or are not aligned, it is not always possible to perform the optimal area limitation. In addition, as shown in FIG. 5, the infrared receiving and guiding device 14 may receive both ID codes a and b at the outer edge of the guiding area. There was a problem that interference could not be avoided.

An object of the present invention is to provide a radio guidance system capable of providing an accurate guidance by narrowing the area even when the guidance area is narrow or close as described above.

[0007]

In order to achieve the above object, according to the present invention, a transmitter transmits a guide ID code using a loop antenna having its antenna conductor laid so as to divide each guide area. On the other hand, the portable reception guide device receives a guide code by using a reception antenna provided with its antenna conductor so as to generate an induced current by interlinking with the magnetic field generated by the loop antenna, and receives the magnetic field inside and outside the loop antenna. Utilizing the phase inversion of the guide ID code generated by the difference in the direction of the
When in the guidance area, a guidance message corresponding to the guidance area is output to the user.

According to the present invention, a magnetic field in a predetermined direction can be received in the guide area and a guide ID code having a predetermined phase can be received, so that a corresponding guide message can always be selected correctly. Conversely, when the user goes out of the guidance area defined by the loop antenna, the user receives a guidance ID code whose phase has been reversed due to the reversal of the direction of the magnetic field, that is, a reversed guidance ID code. Such an inverted guidance ID code is a guidance ID associated with the guidance message.
Since it can be distinguished from a code, it can be processed, for example, as an error signal. Therefore, when only the reverse guidance ID code is detected, the provision of the message is stopped. Reversal guide I
When the D code and another correct guidance ID code are received at the same time, it is possible to provide only a message according to the correct guidance ID code to the user.

FIG. 1 shows the principle of the present invention.
A part of the loop antenna provided in the transmitting device is denoted by reference numeral 20.
When a current flows through the loop antenna 20 as shown by an arrow, a magnetic field φ is generated around the current. Therefore, the directions of the magnetic fields are reversed on the left side (for example, inside the loop antenna 20) and on the right side (on the outside) of the loop antenna 20, and the induction coils 22-1, 22 located in these areas are reversed.
A voltage in the opposite direction is generated at -2.
Therefore, if this induction coil is used as a reception antenna in the portable reception guide device and is arranged so as to interlink with the magnetic field φ, depending on the direction of the voltage generated in the induction coil, the correct guidance ID code is used. It can be recognized whether it is an ID code. Therefore, if the loop antenna 20 is laid on the floor, ceiling, wall surface, or the like of the guide area, the guide area can be finely divided by the loop antenna.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows a state in which a loop antenna 20 is laid on a predetermined guideway floor according to the present invention.
A guide area is defined by the loop antenna 20. Then, a guidance ID code corresponding to the guidance area, for example, (10110) is supplied to the loop antenna 20 from the transmission unit 24 of the transmission device. The mobile reception guide device in the present embodiment has a reception antenna 28 shown by an induction coil in FIG. 1, and the reception antenna 28 receives different signals inside and outside the loop antenna 20. Become. That is, the loop antenna 20
, The receiving antenna 28 receives the signal (10110) as transmitted from the transmitting unit 24,
On the other hand, the receiving antenna 28 is
, The inverted guide ID code, that is, (01001) is received by reversing the receiving voltage polarity of the receiving antenna. Therefore, the portable reception guide device can provide a guide message corresponding to the guide ID code having the correct phase to the user, and can ignore the guide message if the guide ID code is the reverse guide ID code. it can.

FIG. 3 shows a case where the guide areas are close to each other. In such a case, the receiving antenna receives a plurality of signals from the adjacent guide areas, but according to the present embodiment, it is possible to select only a correct signal from the mixed signals.

That is, the transmitting units 24-1 and 24-2 are provided by the loop antennas 20-1 and 20-2 which are sufficiently close to each other.
Transmit different guidance ID codes a and b, the receiving antennas 28-1 and 28-2 inside the loop antennas 20-1 and 20-2 may receive signals from both loop antennas, respectively. However, the receiving antenna 28-1 receives the ID code a and the ID code a.
And the inverted signal of the D code b. As described above, the portable reception guide device can ignore the inverted signal.
A guidance message corresponding to only the ID code a can be supplied to the user. Similarly, the receiving antenna 20-2
Receives the ID code b and the inverted signal of the ID code a, and in this state, can provide a message corresponding to the ID code b to the user.

As described above, according to the present embodiment, the loop antenna is laid on the floor of the guideway to divide the guide area, thereby making it possible to finely limit the area. Then, as described above, since the transmitting unit supplies the loop antenna with the binary combination signal (digital signal) as the guide ID code, the receiving device determines the guide ID by changing the polarity of the voltage inside and outside the loop antenna. This makes it possible to receive the code and the reversal guidance ID code reliably and identifiably.

FIG. 4 is a block diagram of a radio guidance system embodying the present invention.
A D generating unit 32, the transmitting unit 24, and a loop antenna 20 connected to the transmitting unit 24 and laid on a guide road surface to divide a predetermined guide area are provided. The ID generating unit 32 supplies the binary combination signal corresponding to each of the guide areas described above to the transmitting unit 24 as a guide ID code, whereby the loop antenna 20 generates a magnetic field corresponding to the guide ID code at a predetermined time interval. It can be generated in the guidance area.

On the other hand, the portable reception guide device 40 has the above-mentioned reception antenna 28, detects a magnetic field generated by the loop antenna 20, and outputs a guide ID code inside the loop antenna 20 and an inverted guide ID outside the loop antenna 20. Code can be received.

The reception guidance device 40 is provided with a guidance data section 42, in which guidance messages set in all the guidance areas are stored. Then, the guide ID code received by the receiving antenna 28 is sent to the ID decoding control unit 44, and only the guide ID code is extracted (that is, the inverted guide ID code is ignored), and the guide data unit 42 converts the guide ID code into this guide code. Read the corresponding guidance message. Since the ID decoding control unit 44 ignores the inverted guidance ID code, the guidance message is not taken out of the loop antenna 20 as described above. The guidance message extracted from the guidance data section 42 in this way is output to the guidance data output section 46.
Can output to the user in a predetermined format such as voice or display.

As described above, according to the present embodiment,
There is an advantage that the required guidance area is finely limited by the installation of the loop antenna, and no interference occurs in the guidance message.

[0019]

As described above, according to the present invention, each transmission area is divided by the laid loop antenna,
The mobile reception guide device receives the correct guide ID code inside the loop antenna and receives the inverted guide ID code outside the loop antenna, thereby providing the user with a correct guide message only in the guide area. Can be.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a relative relationship between a loop antenna and an induction coil for explaining the principle of the present invention.

FIG. 2 is an explanatory diagram showing a preferred embodiment of the present invention.

FIG. 3 is an explanatory view showing a preferred embodiment of the present invention, in particular, a state in which a guidance area is close.

FIG. 4 is a block diagram showing a preferred embodiment of a wireless guidance system according to the present invention.

FIG. 5 is a schematic diagram showing a conventional guidance system using infrared rays.

[Explanation of symbols]

Reference Signs List 20 loop antenna, 24 transmission unit, 28 reception antenna, 30 transmission device, 32 ID generation unit, 40 portable reception guidance device, 42 guidance data unit, 44 ID decryption control unit, 46 guidance data output unit.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Naoshi Furukawa 5-1-1 Shimorenjaku, Mitaka-shi, Tokyo Japan Radio Co., Ltd. (72) Inventor Yutaka Sada 5-1-1 Shimorenjaku, Mitaka-shi, Tokyo Japan Radio Inside the corporation

Claims (2)

[Claims] 1. A transmission device provided in each guide area along a guide path and transmitting a predetermined guide ID code, and a user carrying the guide ID code in each guide area and receiving the guide ID code. A portable reception guide device that outputs a guide message corresponding to a code to a user, a wireless guidance system including: a transmission device having a loop antenna in which an antenna conductor is laid so as to divide each guide area, The portable reception guide device has a reception antenna in which a magnetic field generated by a loop antenna is interlinked to generate a dielectric current, and a guidance ID generated by a difference in the direction of the magnetic field inside and outside the loop antenna. Using the phase inversion of the code, it is determined whether or not the vehicle is in the guidance area, and when it is in the guidance area, a guidance message corresponding to the guidance area is determined. A wireless guidance system for outputting a message to a user. 2. The radio guidance system according to claim 1, wherein the ID code supplied from the transmitting device to the loop antenna comprises a binarized combination signal.