JPH02198382A - Automatic discriminating apparatus of moving object - Google Patents

Abstract

PURPOSE:To reduce the thickness and cost of a discriminating apparatus by a method whereby an answering device is formed by providing a plurality of kinds of resonant circuits in an insulative paper or the like, so that a frequency of a wave among transmitted waves of a plurality of kinds of predetermined frequencies which is reflected through resonance with said resonant circuits of said answering device is detected. CONSTITUTION:A discriminating apparatus 12 outputs a wave of a resonant frequency controlled by a CPU 15 through an oscillator 21. This output wave is modulated to a pulse wave by an amplifier 22 and transmitted from a transmission antenna 25 via an auto-tuner 24. A receiving output wave B is changed the phase difference from a transmitted output wave A, and a receiving input wave C reflected through resonance with the resonant circuit has the phase difference from the wave B. The waves B and C are input to a receiving antenna 28 where they are extended to be a wave C2. The wave C2 is adjusted by an auto gain controller 31 via an auto-tuner 30. The extended portion of the wave C2 is output from an window amplifier 32 and A/D converted, so that the resonance frequency is detected. Accordingly, the presence or absence and the code of an answering device 11 is judged by a discrimination controlling unit 15a of the CPU 15, thereby discriminating the moving object.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an automatic mobile object identification device, and in particular, a device that provides a plurality of types of resonant circuits, irradiates radio waves, and causes the resonant circuits to resonate and reflect. The present invention relates to an automatic mobile object identification device that detects radio waves to identify mobile objects.

[Prior Art] Conventionally, a device using a tC memory has been proposed as this type of automatic mobile object identification device, and an example thereof will be explained with reference to FIG. 1O. The device is composed of an identifier (1) and a transponder (2), and the transponder (2) has a built-in IC memory (3) and is installed in a mobile object. Then, a predetermined radio wave is transmitted from the interrogation transmitter (4) of the discriminator (1) to form an electric field, that is, an identifiable area. The transponder (2) within the identifiable area receives the radio wave, and transmits the radio wave to the modulator (5) according to the data stored in the IC memory card (3) built into the transponder (2). ) and then fired again.

Then, this radio wave is transmitted to the interrogation receiving section (
6), and then demodulated and controlled by the CPU (η) to identify the mobile object by reading the data from the transponder (2).
2) is operated by a power source such as a battery (not shown). On the other hand, this conventional device transmits data converted into radio waves by the writing transmitter (8) of the identifier (1), and the transponder (
2) allows data to be written to the IC memory (3).

[Problems to be Solved by the Invention] In the conventional mobile object automatic identification device described above, an IC memory element is provided in the transponder to be provided in the moving object, and the transponder requires a power source such as a battery. It has a constant thickness, making it difficult to make it thinner. Furthermore, maintenance such as battery replacement is required depending on the usage time, and since an expensive IC memory element is used, the cost is high and the range of use is limited.

Therefore, a technical problem has arisen that needs to be solved in order to reduce the thickness of the transponder provided in the mobile body, reduce the cost, and eliminate the need for maintenance management.The present invention aims to solve this problem. With the goal.

[Means for Solving the Problems] This invention was proposed to achieve the above object, and consists of forming a transponder by providing a plurality of types of resonant circuits on insulating paper, etc., and attaching the transponder to a moving object. A controller is installed in the CPU so that the identification device transmits radio waves of a plurality of types of predetermined frequencies, resonates with the resonant circuit of the transponder, and detects the frequency of the reflected radio waves to identify the moving object. A moving object automatic identification device is provided, and the transponder is provided with a plurality of types of resonant circuits by depositing a conductor on a sheet-like insulator and forming a coil and a capacitor by etching or the like. An object of the present invention is to provide an automatic mobile object identification device characterized by:

[Function] The present invention is composed of a transponder and a discriminator, and each transponder is provided in each moving body with different combinations of a plurality of types of resonance circuits.

Further, the identification device transmits radio waves of a plurality of types of predetermined frequencies to form an identification area. When the mobile object is present in the identification area, the resonant circuit of the transponder resonates with radio waves of a specific frequency among the radio waves transmitted from the identification device, and reflects the radio waves. do. Therefore, since the combination of resonant frequencies of this reflected wave differs depending on the individual transponders, by detecting the frequency of the reflected wave with a control unit provided in the CPU of the discriminator, it is possible to identify multiple moving objects. can be individually identified.

In addition, this responder has a conductor provided on a sheet-like insulator, a coil and a capacitor formed by means such as etching, and a plurality of types of resonant circuits.

Each responder is formed with a different combination of resonant circuits depending on the identification code. Therefore, the transponder can be formed without requiring an IC memory element or a power source such as a battery as in the conventional transponder described above, so it can be provided at low cost and can be made thinner. Moreover, there is no need for maintenance management.

[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings, FIGS. 1 to 9. For convenience of explanation, conventionally known technical matters will also be explained at the same time.

Reference numeral (10) in the figure is the mobile object automatic identification device of the present invention, which, as shown in FIG. ) is provided.

In addition, this discriminator θgong has a radio wave transmitting section θ→ and a receiving section (14
) and CPU (+'9), and the CPU (1
On the other hand, the transponder Q1 is equipped with a sheet-like insulator (15) as shown in FIG.
Aluminum lamura is glued to the lfo, and a coil (r?) @... and a capacitor (day...) are formed by etching, and 14 types of resonant circuits (υ(0...) are provided. This resonant circuit (the seagull (υ...) is formed to resonate with each frequency of radio waves as shown in Fig. 3, but in this embodiment, the frequencies (I) to (fl4) are
12 to 160M112 are appropriately divided and used. Then, the transponder 01) is coded, and as shown in FIG. 4, each code is used to make the combination of resonance frequencies of the resonant circuit (1 (seagull) different), so that the mobile object (M) can be identified. ing.

In addition, ○ in the figure indicates that there is a resonant circuit (g) (υ...), and among the resonant frequencies (fl) to (fl4), (f
l3) is a frequency for preventing malfunction, and (fl4) is a frequency for checking the presence or absence of a transponder. Therefore, the remaining number is 12.
4095 (212-1
'), but the resonant frequency (') can be encoded.
The number of species 1) to (fl4) should not be limited to these, and may be adapted depending on the number of identification species of the mobile object (M) or the field of use.

Furthermore, in this embodiment, as shown in FIG.
11) to form 14 types of resonant circuits (1') 01..., and then, according to each code, create an unnecessary resonant circuit (the capacitor of the seagull... 1) (1)
... is opened and the resonant circuit (υ(11)... We are trying to reduce this.

In addition, as shown in FIG. is output from the oscillator (21) of the transmitter θ→ at a constant cycle.Then, the radio wave is modulated into a pulse wave by the amplifier (g), amplified by the output amplifier (g), and sent to the autotuner (rotator). ) is transmitted from the transmitting antenna (c).The rise and fall times of the pulses of the radio waves are approximately 50JS.Figure 6 shows the transponder (11 ) is attached and the parcel (4) is being moved on the belt conveyor (), but the transmitting antenna (c) and receiving antenna (a) are attached on both sides of the belt conveyor (Q). is located. The radio waves transmitted from the transmitting antenna (c) form an identifiable area (g). In addition, the radio wave A transmitted from this transmitting antenna (G) and the radio wave C that is reflected by the resonant circuit of the transponder 01 (the seagull...) and the radio wave C that is reflected by the seagull and reach the receiving antenna (B) without being resonated. Radio waves B and radio waves B
A composite radio wave C2 of and C is shown in FIG. The reception input radio wave B is inputted with a phase difference of Δ1 relative to the transmission output radio wave A. Furthermore, the received input radio wave C that resonates and is reflected by the resonant circuit has a phase difference of Δ2 with respect to the radio wave B. and,
Since the radio waves B and C are input to the receiving antenna (a),
The composite wave C2 becomes a radio wave that is extended by Δ2 with respect to the radio wave B.

Furthermore, the radio wave C2 input to the receiving antenna (1) is
As shown in Fig. 5, the output is adjusted appropriately by the auto gain control (31) via the auto tuner (to), and the output is adjusted appropriately by the wind amplifier (b) and the wind integral amplifier (
c). Therefore, the radio wave C2 inputted to the wind amplifier (2) is outputted from the wind amplifier (to) by only the extension portion Δ2, which is then input to the AD converter (
The resonant frequency of the resonant circuit (...small...) is detected through the resonant circuit (...small...
), the presence or absence of the transponder 01) and the code of the transponder 00 are determined, and the mobile object (M) is identified. On the other hand, the wind integrating amplifier (to) integrates the phase difference between the radio waves B and C, and the change in the phase difference causes the resonant circuit (
Detects the resonant frequency of υ (...) and connects the AD converter (
Identification control unit (1!u) of the CPU (g) via b)
The presence or absence of the transponder θ1) and its code are determined at the transponder θ1), and the mobile object (M) is identified. That is, the transponder (1
When 1) does not exist in the discernible area (g) or when a certain radio wave is not resonated, the phase of the received input radio wave B with respect to the transmitted output radio wave A is constant, and as shown in Figure 8, the wind integral The amplifier output remains at a constant level. However, as the moving body (M) moves, the reflection distance of the resonance reflected wave C changes and the phase difference Δ2 with respect to the radio wave B changes, so naturally the composite wave C2 of the radio waves B and C is as shown in FIG. The output level changes as shown in the window integrating amplifier output.

Note that this level change in the figure is just an example, and it cannot necessarily be limited to the level change shown in the figure. However, when a level change is observed, the frequency changes from the resonant circuit (gap).・It is detected that the moving body (M) resonates.Therefore, in combination with the detection of the extended portion of the composite wave C2 in the wind amplifier (2), the moving object (M) can be reliably identified. In FIG. 5, symbol (g) is a clock, which transmits a reference frequency.

Therefore, the transponder θ1 of the automatic mobile object identification device (1o)
) is formed by bonding aluminum to the sheet-shaped insulator (1 (9) and etching it, as described above, so it is extremely thin and inexpensive, and does not require maintenance.

Further, by applying an adhesive material to the back surface of the transponder (11) and sealing it, it can be easily installed in the moving object. Furthermore, a coil (r
7) (r7) . . . or a capacitor (G) (7) is provided to significantly improve the Q characteristic of this transponder (11).

[Effects of the Invention] As described in detail in the above embodiment, the present invention is composed of a transponder and a discriminator, and the transponder is provided with a conductor on a sheet-like insulator, and a plurality of types of conductors are formed by an etching process. It forms a resonant circuit. Then, the discriminator detects the frequency reflected by the resonant circuit to identify the moving object. Therefore, the transponder is extremely thin, can be provided at low cost, and requires no maintenance. Therefore, the transponder can be sealed, and can be used as a tag for route trucks, parcels, etc., hospital medical records, etc.
This invention has various significant effects, such as non-contact sensors for time recorders, parking lot management, passports, etc.

Note that this invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that this invention extends to such modifications.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is an explanatory diagram of the automatic mobile object identification device, Fig. 2 is a plan view of the transponder, Fig. 3 is an explanatory diagram of the resonant frequency of the transponder, and Fig. 4 is an explanatory diagram of the code of the transponder, Fig. 5 is a circuit block diagram of the discriminator, Fig. 6 is an explanatory diagram when this device is used to identify parcels such as parcels, and Fig. 7 is an illustration of the radio waves ^, B. . An explanatory diagram of the waveforms of C1 and C2 and the output level of the wind amplifier. Fig. 8 is an explanatory diagram of the radio wave B and the output level of the wind amplifier due to the radio wave B and the output level of the wind integrating amplifier. Fig. 9 is an explanatory diagram of the radio wave C2 and its output level. FIG. 10 is an explanatory diagram of the output level of the wind amplifier and the wind integrating amplifier by radio wave C2, and FIG. 10 is an explanatory diagram of the conventional mobile object automatic identification device. (10... Mobile object automatic identification device 01)...
...Responder (b) ...Identification device θ one
...CPU (15a)...
・Identification control unit (IE)・・・Insulator (
0... Coil (day... Capacitor)
(1...Resonance circuit (M)...Moving body mechanism Figure 6 (+1)...Responder

Claims (2)

[Claims] (1) A transponder is formed by providing multiple types of resonant circuits on insulating paper, etc., this transponder is provided in a moving body, and radio waves of multiple types of predetermined frequencies are emitted from an identification device, and the resonant circuit of the transponder is 1. An automatic moving object identification device, characterized in that a CPU is provided with a control unit so as to be able to identify the moving object by detecting the frequency of radio waves that resonate with and reflect. (2) The movement according to claim (1), wherein the transponder is provided with a conductor on a sheet-like insulator, and a coil and a capacitor are formed by etching or the like to provide a plurality of types of resonant circuits. Automatic body identification device.