JPH0325832B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transmitting device suitable for ID (identification) cards, electronic locks, cash payment cards, etc., which have a built-in IC or the like that can read data in a non-contact manner.

A conventional example of this type of device is shown in FIG. 1. The illustrated device includes a carrier wave oscillation circuit 2 equipped with a crystal oscillator 5, and a data generation circuit 3 operated by a clock signal from a clock oscillation circuit 4. , and a battery 1 which is a driving source for each of these circuits 2, 3, and 4, the carrier wave from the oscillation circuit 2 is modulated by the modulation circuit 12 by the output from the data generation circuit 3, and the output is sent to the coupler 13. It is sent out as vibrational energy.

However, since a time constant circuit consisting of a crystal oscillator 5, a resistor 6, and a capacitor 7 is used as the oscillation frequency determining element of the oscillation circuits 2 and 4, it is expensive and large, and has low frequency accuracy and instability. It had the following drawbacks.

The purpose of this invention is to eliminate these drawbacks by providing a field of vibrational energy, such as a high-frequency electromagnetic field, magnetic field, or ultrasonic wave, in space, and absorbing the energy of this field to use it as a drive source for the device. ,
In addition, the alternating current component of the field is used as a carrier wave or clock signal, either as is, or after being multiplied or frequency-divided.
This will eliminate the need for oscillation circuits and oscillation elements, or
It is something that reduces

FIG. 2 is a block diagram showing an embodiment of the data transmitting device of the present invention. The data transmitter of this embodiment includes a receiver 9 such as an antenna, a coil, or a sound receiver that receives energy from a vibration energy field 8 such as a high-frequency electromagnetic field or ultrasonic waves and outputs alternating current power. A rectifier circuit 10 that rectifies the AC power from the receiver 9 into DC power, a frequency conversion circuit 11 that divides or multiplies the frequency of the AC component of the received vibration energy, and an output of the frequency conversion circuit 11. a data generation circuit 3 which operates as a clock signal and outputs, for example, predetermined code data; and a modulation circuit 12 which uses the output from the frequency conversion circuit 11 as a carrier wave and modulates it into the output from the data generation circuit 3. and a coupler 13 that transmits the output from the modulation circuit 12 on vibrational energy.

Next, the operation of the above embodiment will be described. When the data transmitting device is located within the vibrational energy field 8 previously formed in space by a high-frequency electromagnetic field or an ultrasonic generator (not shown), the receiver 9
absorbs vibration energy and converts it into AC power,
This power is converted into DC power by a rectifier circuit 10 and then given to a frequency conversion circuit 11, a data generation circuit 3, and a modulation circuit 12 as driving power. Further, the alternating current component of the vibrational energy is transmitted to the data generation circuit 3 as a clock signal either directly at its frequency (as shown by the dotted line) or after being frequency-divided or multiplied by the frequency conversion circuit 11. On the other hand, data generation circuit 3
For example, a code assigned to the person who owns this device is set, and when the device is driven by the DC power, that data is output. This data is mixed with a carrier wave from the frequency conversion circuit 11 in a modulation circuit 12, and the modulated carrier wave is carried by a coupler 13 on vibration energy and transmitted to an external device.

In the above, when the output from the receiver 9 is directly given to the modulation circuit 12 as a carrier wave, the receiver 9
corresponds to a carrier wave source, and when passing through the frequency conversion circuit 11, this and the receiver 9 correspond to a carrier wave source. Note that the vibration energy for obtaining DC power and the vibration energy for obtaining a clock signal and a carrier wave may be the same or different.

According to the present invention, since the carrier wave and the clock signal for the data generation circuit are obtained based on the alternating current component of the vibration energy field 8, two sets of oscillation circuits as in the prior art are no longer required, and an inexpensive and small become.
If a crystal resonator is used as the oscillation element of a vibration energy generator that forms a high-frequency electromagnetic field or ultrasonic vibration energy field, the frequency accuracy and stability of carrier waves and clock signals will be extremely high. Furthermore, since the alternating current component of the field 8 and the output data are synchronized in a specific relationship, the data can be easily decoded on the receiving side of the modulated carrier wave. In addition, since the energy of field 8 is absorbed and used as a driving source for each circuit, there is no need for batteries, and there is no need for external terminals, so the structure is watertight or airtight, improving environmental resistance and reliability. In addition to being able to improve performance, there are also effects such as being economical because almost no maintenance is required.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional data transmitting device, and FIG. 2 is a block diagram showing an embodiment of the data transmitting device according to the present invention. 8...Vibratory energy field, 9...Receiver, 1
0... Rectifier circuit, 11... Frequency conversion circuit, 12
...Modulation circuit, 13...Coupler.

Claims (1)

[Scope of Claims] 1. A receiver that receives the energy of a vibrational energy field formed in space and generates alternating current power, and a rectifier circuit that converts the alternating current power from the receiver into direct current power. a data generation circuit that operates as a clock signal using a frequency signal obtained based on the alternating current component of the vibrational energy received by the receiver; a carrier wave source that generates a carrier wave based on the alternating current component; A modulation circuit that modulates the carrier wave with the output of the data generation circuit, and a coupler that transmits the output of the modulation circuit on vibrational energy, and the data generation circuit and the modulation circuit are provided with the output of the rectification circuit. A data transmitting device characterized in that it is driven by direct current power.