JPH0351785A - Non-contact identification card - Google Patents

Abstract

PURPOSE:To drastically extend the life of a built-in battery by suppressing power consumption by supplying a battery power supply to a transmission part only for a definite time based on the output of a receiving part receiving the signal from an identification system main body. CONSTITUTION:When a non-contact identification card 11 approaches the identification range of an identification system main body 10, a receiving part 14 receives the monitor signal from the identification system main body 10 and, on the basis of this receiving output, a power supply switch over circuit 15 supplies a battery power supply 12 to a transmission part 13. In this case, the sensitivity of the receiving part 14 of the non-contact identification card 11 and the switch over period of the power supply switch over circuit 15 are set so that the transmission part 13 is operated when the identification signal receiving part 17 of the identification system main body 10 certainly approaches the non-contact identification card 11 at a distance enough to identify the content of an identification signal. Therefore, even when the transmission output level of the identification signal is enhanced, power consumption is suppressed and the life of a built-in battery can be drastically increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a portable contactless identification card having a built-in battery power source in the card.

(Prior Art) FIG. 2 shows a conventional portable contactless identification card 21 and
2 shows an identification system main body 20 for identifying an identification signal transmitted from a non-contact identification card 21 of a child. The contactless identification card 21 has a built-in transmitter 22 that transmits identification signals to the identification system main body 20 and a battery (battery power source) 23 for power supply. It has a reception identification section 24 that receives and identifies an incoming identification signal.

In the contactless identification card 21, the transmitter 22 must always transmit an identification signal, and the range of the transmitted identification signal is proportional to the transmission output level, so in order to extend the range, the transmission output level must be increased. It needs to be bigger.

However, when the transmission output level of the identification signal is increased, the power consumption of the transmitter 22 increases, and the consumption of the built-in battery 23 increases. In other words, the reach distance of the identification signal and the built-in battery 23
There is a relationship in inverse proportion to the lifespan of the battery, and if the battery life is given importance, the transmission output level of the identification signal cannot be increased, and malfunctions are likely to occur in the reception and identification of the identification signal in the identification system main body 20. .

(Problems to be Solved by the Invention) As mentioned above, in conventional contactless identification cards, the reach distance of the identification signal and the lifespan of the built-in battery are inversely proportional. There is a problem in that the output level cannot be increased, and malfunctions are likely to occur in the reception and identification of the identification signal in the main body of the identification system.

The present invention has been made to solve the above problems, and its purpose is to transmit identification signals, etc. only for a short period of time necessary for transmission, and to prevent malfunctions in reception and identification of identification signals, etc. in the main body of the identification system. To provide a non-contact identification card that can suppress power consumption and dramatically extend the life of a built-in battery even if the transmission output level of an identification signal or the like is increased as much as necessary to prevent this.

[Structure of the Invention] (Means for Solving the Problems) The contactless identification card of the present invention includes a battery power source, a transmitter for transmitting an identification signal, and a transmitter for transmitting an identification signal when the signal from the main body of the identification system arrives. a receiving section for receiving, and usually supplying the output of the battery power source to the receiving section, and transmitting the output of the battery power source to the transmitting section based on the output of the receiving section receiving the signal from the identification system main body. The card is characterized by having a built-in transmission power control circuit that supplies power only for a certain period of time.

(Function) Under normal conditions, when the contactless identification card is not located within the identification distance of the identification system main body, only the reception section and transmission power control circuit, which consume less power, are powered by the battery power supply. ing. When the contactless identification card approaches within the identification distance of the identification system main body, the receiving section of the contactless identification card receives a signal from the identification system main body, and based on this reception output, the transmission power of the contactless identification card is The control circuit supplies battery power to the transmitter for a certain period of time. In other words, the contactless identification card only transmits identification signals and the like for a short period of time during which it is necessary to transmit them.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a contactless identification card 11 and an identification system body 10 for identifying the contactless identification card 11.
It shows. The contactless identification card 11 is a battery type [12
, a transmitting section 13 for transmitting an identification signal, etc., a receiving section 14 for receiving a monitoring signal from the identification system body 10 when it arrives, and normally the output of the battery power source 12 is sent to the receiving section 14. The battery type [
The card includes a transmission power supply control circuit 15 that supplies the output of 12 to the transmission section 13 for a certain period of time. Here, as an example of the transmission power supply control circuit 15, a power supply switching circuit 15 that switches and supplies battery type IIi, 12 from the reception section 14 to the transmission section 13 for a certain period of time based on the reception output of the reception section 14 is used. ing.

The identification system main body 10 also includes a monitoring signal transmitting section 16 for transmitting a monitoring signal, and an identification signal receiving section 1 for receiving and identifying identification signals etc. from the contactless identification card 11.
7, and a power source.

In the non-contact identification card 11 configured as described above, only the receiving section 14 and the power switching circuit 15, which consume less power, are connected to the battery power source 12 when the non-contact identification card 11 is not located within the identification range (distance) of the identification system main body 10. Powered. When the contactless identification card 11 approaches within the identification range of the identification system main body 10, the receiving section 14 receives a monitoring signal from the identification system main body 10, and based on this reception output, the power supply switching circuit 15 switches the battery power supply. 12 is supplied to the transmitter 13 for a certain period of time.

In this case, the sensitivity of the receiving section 14 of the non-contact identification card 11 and the switching timing of the power supply switching circuit 15 are determined at a distance (this is determined according to the transmission capability of the contactless identification card 11.) The transmitter 13 is set to operate when the contactless identification card 11 approaches the contactless identification card 11.

Therefore, according to the contactless identification card 11 as described above, since the identification signal etc. is transmitted only for a short period of time, it is possible to prevent malfunctions in reception and identification of the identification signal in the identification system main body 10. Even if you increase the transmission output level of the identification signal etc. as much as necessary, it will disappear! By suppressing the power consumption, the life of the built-in battery 12 can be dramatically extended.

[Effects of the Invention] As described above, according to the present invention, the receiving section supplies battery power to the transmitting section for a certain period of time based on the output of receiving the signal from the main body of the identification system. Even if the transmission output level of the identification signal, etc. is increased as necessary to prevent malfunctions in reception and identification of the identification signal, etc. in the identification system itself, the power consumption can be reduced. It is possible to realize a contactless identification card that can dramatically extend the life of the built-in battery by suppressing the amount of electricity.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the contactless identification card and identification system main body of the present invention, and FIG. 2 is a block diagram showing a conventional contactless identification card and identification system main body. 11... Contactless identification card, 12... Battery power supply, 1
3... Transmission section, 14... Receiving section, 15... Transmission power supply control circuit (power supply switching circuit).

Claims (1)

[Claims] A battery power source, a transmitting section for transmitting an identification signal, a receiving section for receiving a signal from the main body of the identification system when it arrives, and usually the battery power source is connected to the receiving section. and a transmitting power supply control circuit that supplies the output of the battery power source to the transmitting unit for a certain period of time based on the output that the receiving unit receives the signal from the identification system main body. Features a contactless identification card.