JPH0742582U - Antenna mounting device in fixed station - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a communication area formed by the transmitting antenna 58 and the receiving antenna 50 of the fixed station 11 with directivity so as to obtain an object that can be reliably detected. A device for transmitting data in which a fixed area 11 has a transmission area of a transmission antenna 58 for a mobile station 10 and a reception area of a reception antenna 50 for receiving a signal from the mobile station 10 as a communication area The antenna 58 and the receiving antenna 50 are arranged in the same direction, and the angles formed by them are narrowed inward, and the angle between the transmitting antenna 58 and the receiving antenna 50 is 145 to 175 degrees. . Therefore, directivity is given to the communication area, an effective communication range is set, and data is reliably transmitted and received.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for mounting an antenna in a fixed station that has directivity in a communication area formed by a transmitting antenna and a receiving antenna of a fixed station arranged in parallel.

[0002]

[Prior art]

 In order to allow only specific people or objects to enter or exit a specific entrance / exit, conventionally, an ID card as a mobile station with a unique identification code was issued, and the ID card was installed at the entrance / exit and its vicinity. It is then inserted into the card reader, and it is judged whether or not the identification code is assigned only to the person or thing that can enter the room with this card reader.If they match, the door is opened and the entry is permitted. Was there.

[0003]

[Problems to be solved by the device]

 However, in the method of inserting the ID card into the card reader and reading the identification code for judgment, it is necessary to perform troublesome operations such as taking out and storing the ID card each time the user enters or leaves the room. Therefore, as shown in FIG. 5, the transmitting antenna 58 and the receiving antenna 50 of the fixed station 11 are arranged close to each other, and are formed in a portion where the transmitting area of the transmitting antenna 58 and the receiving area of the receiving antenna 50 overlap. When the ID card 10 enters the communication area (hatched portion), the ID card 10 receives the transmission signal from the transmission antenna 58, and the reception antenna 50 receives the signal from the ID card 10. It may be possible to automatically detect what should be done and judge the content of the identification code to permit entry.

A circuit in such a case is shown in FIG. 3, for example. In FIG. 3, the fixed station 11 includes a receiving antenna 50 for receiving a signal from the ID card 10 as a mobile station, a tuning circuit 51 for extracting a specific signal from the received signal, and an amplification for voltage amplification. A circuit 52, a waveform shaping circuit 53 for shaping an input signal waveform, a microcomputer 54 for exchanging signals with a fixed station centralized control circuit 40 provided separately, and a transmission request signal from the microcomputer 54 at fixed time intervals. A transmission request signal generating circuit 55, a modulation circuit 56 for ASK modulating the transmission request signal, an amplification circuit 57 for current amplification, and a transmission antenna 58 for transmitting a radio wave to the ID card A10 as the mobile station. Consists of.

The ID card 10 includes a receiving antenna 60 that receives a signal from the fixed station 11, a tuning circuit 61 that extracts a specific signal from the received signal, and a signal detection circuit that detects an input signal. 63, a timer circuit 64 that operates for a time set by the first signal from the signal detection circuit 63, and a first clock generation that is driven by the output of the timer circuit 64 and that oscillates a clock signal for reading A circuit 65, a second clock generation circuit 66 that oscillates a carrier having a frequency sufficiently higher than that of the first clock generation circuit 65, and a read clock signal of the first clock generation circuit 65. Of the frequency of the second clock generating circuit 66 according to the identification code of the identification code memory circuit 67 for outputting It comprises a modulation circuit 68 for K modulation and a transmission antenna 70 for transmitting radio waves to the fixed station 11. The fixed station centralized management circuit 40 controls a large number of fixed stations 11 and includes a control circuit 41.

The operation of the above configuration will be described with reference to the waveform chart of FIG. (1) When a reset pulse from the fixed station central control circuit 40 outputs a signal from the microcomputer 54 and a transmission request (Call) signal is output from the transmission request signal generation circuit 55, this is ASK modulated by the modulation circuit 56. The current is amplified by the amplifier circuit 57, and the transmission request signal is repeatedly transmitted from the transmission antenna 58 at regular intervals.

(2) Assuming that the ID card 10 has entered the communicable area of the transmission request signal by the fixed station 11, the receiving antenna 60 and the tuning circuit 61 of the ID card 10 are used as shown in FIG. Such a transmission request (Call) signal is received and input to the signal detection circuit 63. When the input signal level exceeds a preset threshold voltage of the signal detection circuit 63, the signal detection circuit 63 outputs a signal as shown in FIG. 4B and the timer shown in FIG. The circuit 64 is driven for the set time T and oscillates different clock signals from the first clock generation circuit 65 and the second clock generation circuit 66.

(3) A read clock signal as shown in FIG. 4D of the first clock generation circuit 65 is sent to the identification code memory circuit 67 to read out a unique identification code as shown in FIG. 4F. . A check digit is added to this identification code as necessary. The identification code from the identification code memory circuit 67 is ASK-modulated by the modulation circuit 68 for the carrier signal as shown in FIG. 4 (e) of the second clock generation circuit 66, and is transmitted from the transmission antenna 70 as shown in FIG. 3 (g). Send out a signal. At this time, in the ID card 10, the control signal from the timer circuit 64 is supplied to the first and second clock generation circuits 65 and 66, the identification code memory circuit 67, and the modulation circuit 68 as electric power (Vcc), respectively. Such a batteryless type may be used, or a type driven by a built-in battery may be used.

(4) The identification code signal of the ID card 10 is detected and demodulated by the reception antenna 50 and the modulation circuit 51 of the fixed station 11, the voltage is amplified by the amplification circuit 52, the waveform is shaped by the waveform shaping circuit 53, and the microcomputer 54 To enter. The microcomputer 54 determines whether or not the input identification code is registered.

(5) If registered, the fixed station number of the fixed station 11 is added to the identification code, and the signal is output from the microcomputer 54 to the fixed station centralized management circuit 40. (6) The data input to the fixed station central management circuit 40 is converted into predetermined data and output to the control circuit 41. (7) The control signal from the control circuit 41 controls the door to be opened, and when the person carrying the ID card 10 passes by, the door is closed.

In the above transmission / reception circuit, the communication area formed by the transmission antenna 58 of the fixed station and the reception antenna 50 is provided with directivity, and an effective communication range is set to surely detect the area. It is desirable to be able to do so.

An object of the present invention is to provide a device capable of reliably detecting a communication area formed by a transmitting antenna 58 and a receiving antenna 50 of a fixed station so as to have directivity.

[0013]

[Means for Solving the Problems]

 The present invention relates to a device for transmitting data in which a transmission area of a transmission antenna of a fixed station to a mobile station and a reception area of a reception antenna that receives a signal from the mobile station are used as a communication area to transmit data. The antenna mounting device in a fixed station is characterized in that the receiving antenna and the receiving antenna are oriented in the same direction and the angles formed by them are narrowed inward.

[0014]

[Action]

 The fixed station central control circuit repeatedly sends a reset pulse signal to the fixed station, and the transmission request signal is continuously transmitted from the transmitting antenna of the fixed station at predetermined intervals. Here, when a mobile station enters the transmission area, the mobile station receives the signal from the transmitting antenna, reads the unique identification code, modulates the carrier wave with this, and outputs the identification code signal from the antenna of the mobile station. send. When entering the communication area formed by the overlapping area of the transmitting area of the transmitting antenna 58 and the receiving area of the receiving antenna 50, the identification code signal of the mobile station is received by the receiving antenna of the fixed station and then detected and demodulated. It is further amplified, waveform shaped, and input to my computer. It is determined whether the identification code input by this microcomputer is registered. Then, open the door and allow entry. The transmitting and receiving antennas of the fixed station are installed at an angle so that they are narrower inside, so that directivity and effective communication range are given to the communication area to ensure reliable data transmission and reception. Be done.

[0015]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. In the present invention, the transmitting antenna 58 and the receiving antenna 50 are oriented so that the angle θ formed between them is narrowed to about 145 to 175 degrees as shown in FIGS. 1 (b), (c) and (d). It has sex.

The reason will be described in detail. When the transmitting direction of the receiving antenna 50 and the receiving direction of the transmitting antenna 58 are installed in the directions orthogonal to the winding direction of the antenna coil as indicated by the dotted arrows in FIG. 5, respectively, the receiving area of the receiving antenna 50 is And the transmission area of the transmission antenna 58 has a certain spread. Then, when the receiving antenna 50 and the transmitting antenna 58 are brought close to each other by a certain distance d, these transmitting area and receiving area overlap, and this becomes a communication area. It is assumed that the ID card 10 also has a transmission / reception area extending in a dotted arrow in FIG. 5 which is orthogonal to the winding direction of the antenna coil. If the distance d between the receiving antenna 50 and the transmitting antenna 58 is too small, the electromagnetic coupling will be adversely affected and the magnitude of the magnetic field generated in the ID card 10 will decrease. About one-fifth of the length of 50 is installed separately.

FIG. 1A shows a communication area in which transmission and reception are possible in the case before the improvement shown in FIG. 5 in which the angle θ between the receiving antenna 50 and the transmitting antenna 58 is 180 degrees, is indicated by a dotted frame. . From this characteristic diagram, it becomes possible to communicate at a distance r = 10 cm from the receiving antenna 50 and the transmitting antenna 58, the communication area gradually expands to 35 cm at r = 15 cm, and the communication area a1 = 35 cm as it is at r = 15 to 30 cm. When r = 30 cm is exceeded, the width becomes gradually narrower. When r = 40 cm, a2 = 20 cm, and when r = 45 cm, a3 = 13 cm, and when r = 50 cm, the communication area disappears. The communication area in the example of FIG. 1A is substantially symmetrical to the bisector (orthogonal line) La passing through the midpoint O between the receiving antenna 50 and the transmitting antenna 58.

FIG. 1B shows a communication area in which transmission / reception is possible when the angle θ between the receiving antenna 50 and the transmitting antenna 58 is narrowed to the inside of θ = 165 degrees and is indicated by a dotted frame. From this characteristic diagram, it becomes possible to communicate at the distance r = 10 cm from the receiving antenna 50 and the transmitting antenna 58, and the communication area gradually expands at r = 15 to 20 cm. The communication area b1 = 35 cm at r = 30 cm, b2 = 23 cm at r = 40 cm, b3 = 19 cm at r = 45 cm, and the communication area disappears when r = 50 cm is exceeded. In FIG. 1B, the communication area is substantially symmetrical with respect to the bisector Lb.

FIG. 1C shows the communication area when θ = 150 degrees. From this characteristic diagram, communication becomes possible at a distance r = 10 cm, and the communication area gradually expands at r = 15 to 20 cm. When r = 30 cm, the communication area c1 = 33 cm, and when r = 40 cm, c2 = 26 cm, and r = 45 cm, c3 = 22 cm. When r = 50 cm, the communication area disappears. In FIG. 1C, the communication area is substantially symmetrical with respect to the bisector Lc.

FIG. 1D shows the communication area when θ = 135 degrees. From this characteristic diagram, communication becomes possible at a distance r = 10 cm, and the communication area gradually expands at r = 15 to 20 cm. When r = 30 cm, the communication area becomes d1 = 25 cm, and when r = 40 cm, d2 = 13 cm. When r = 45 cm, the communication area disappears. In FIG. 1D, the communication area is substantially symmetrical with respect to the bisector Ld.

FIG. 1E shows the communication area when θ = 120 degrees. From this characteristic diagram, communication becomes possible at a distance r = 10 cm, and the communication area gradually expands at r = 15 to 20 cm. The communication area e1 = 5 cm when r = 30 cm, and the communication area disappears when r = 30 cm is exceeded. In FIG. 1E, the communication area is substantially symmetrical with respect to the bisector Le.

FIG. 1F shows the communication area when θ = 90 degrees. From this characteristic diagram, it becomes possible to communicate at a distance r = 10 cm, and when r = 15 cm is exceeded, the communication area disappears. In FIG. 1 (f), the communication area is substantially symmetrical with respect to the bisector Lf.

Next, FIG. 2 shows the change of the communication range, that is, the angle θ between the receiving antenna 50 and the transmitting antenna 58, and the reception based on the measurement results of FIGS. 1 (a) to 1 (f). The relationship between the distance r from the antenna 50 and the transmitting antenna 58 and the communication area is shown. From FIG. 2, at r = 30 cm, θ = 180 to about 130 degrees, at r = 40 cm, θ = 180 to about 140 degrees, and at r = 45 cm, θ = about 170 to about 145 degrees. However, it is understood that each is suitable as a communication range. Therefore, in order to make the distance r from the receiving antenna 50 and the transmitting antenna 58 as close as possible to as far as possible and to widen the effective range, it is necessary that θ = 175 to 145 degrees.

[0024]

[Effect of device]

 Since the present invention is configured as described above, the directivity is provided in the communication area where the transmitting antenna and the receiving antenna overlap on the fixed station side, and the effective communication range is set to ensure the data transmission with the mobile station. Can be transmitted.

In particular, the effective communication range is as close as possible to the distance r from the antenna, and the effective communication range is the angle θ = 175 to 145 degrees.

[Brief description of drawings]

FIG. 1 is an explanatory view of an antenna angle and a communication range of a fixed station in an antenna mounting device for a fixed station according to the present invention.

FIG. 2 is a characteristic diagram showing a relationship between a communication range and an antenna angle in FIG.

FIG. 3 is a block diagram of a fixed station and a mobile station.

FIG. 4 is a waveform diagram of each part.

FIG. 5 is an explanatory diagram of a transmission area, a reception area, and a communication area.

[Explanation of symbols]

10 ... ID card as mobile station, 11 ... Fixed station, 40
... fixed station centralized control circuit, 41 ... control circuit, 50 ... reception antenna, 51 ... tuning circuit, 52 ... amplification circuit, 53 ... waveform shaping circuit, 54 ... microcomputer, 55 ... transmission request signal generation circuit, 56 ... modulation circuit, 57 ... Amplification circuit, 58 ... Transmission antenna, 60 ... Reception antenna, 61 ... Tuning circuit, 63 ... Signal detection circuit, 64 ... Timer circuit, 65 ... First clock generation circuit, 66 ... Second clock generation circuit, 67 ... identification code memory circuit, 68 ... modulation circuit, 70 ... transmission antenna.

Claims (2)

[Scope of utility model registration request] 1. A device for transmitting data, wherein a transmission area of a transmission antenna of a fixed station to a mobile station and a reception area of a reception antenna for receiving a signal from the mobile station are used as a communication area to transmit data. An antenna mounting device in a fixed station, characterized in that the receiving antennas are arranged in the same direction and the angles formed by them are narrowed inward. 2. The antenna mounting device in a fixed station according to claim 1, wherein the angle between the transmitting antenna and the receiving antenna is 145 to 175 degrees.