JPS62162183A - Ic card - Google Patents

Abstract

PURPOSE:To prevent information from being inputted even if an information input means such as a key switch is operated to develop malfunction at the time not in use by validating the action of the input means only when a photosensitive control means senses external light and generates an output signal. CONSTITUTION:Each AND gate 17 is so constituted that passes through an input signal from each key switch connected to the one input of each AND gate 17 and supplies it to a microcomputer 11 only when it is gated by the output signal, which a photosensitive photodetector 7 generates by sensing light, through a constant voltage circuit 23. Input information from the key switch 3, which is inputted through the operation of each key switch 3, becomes valid only when the photosensitive photodetector 7 is projected by light and senses it, and said information is inputted to the microcomputer 11 and processes by it.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention has a key switch for inputting various information to a built-in integrated circuit, and a display that displays information based on the input information from the key switch. The present invention relates to an IC card having a section.

[Technical background of the invention and its problems] IC cards are
It is a thin plastic card the size of a credit card with integrated circuit chips such as memory and a microcomputer embedded in it.It is small and convenient to carry, can store a variety of information, and has a relatively low storage capacity. Because they are large, they are being used for a variety of purposes.

In order to make the IC card more convenient to use, it is equipped with a key switch, a display section,
For example, devices with a liquid crystal display have been developed. In this IC card, various information can be entered and stored using a key switch, and furthermore, it can be displayed on a display section as necessary, and its uses are widening.

By the way, in an IC card having a key switch as described above, information can be input simply by operating the key switch, so there is a problem that information may be input erroneously. For example, an IC card is generally used by being connected to an information processing device (21I) that has an information writing function.Then, before connecting the IC card to this device, the IC card's key switch is usually operated. Although the mode is set before connecting to the device, there is a risk that, for example, the key switch may malfunction during this connection operation, and if the device is of a type that does not take a key switch into consideration, there is a possibility that the card ejection row is There is a problem of pressing the rekey switch and causing it to malfunction.Furthermore, if you are carrying an IC card, for example, if the
Even when the key switch is carried around in a bag, for example, the key switch may be activated by mistake, causing problems such as important stored information being erased or replaced.

[Purpose of the invention]

This invention has been made in view of the above, and its purpose is to provide an IC card that will not malfunction and input incorrect information even if the information input means such as a key switch is operated when not in use. be.

[Summary of the invention]

In order to achieve the above object, the present invention provides an IC card having an input means for inputting various information to a built-in integrated circuit. The gist is to enable the operation of the input means only when an output signal is generated in response.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a front view of an IC card showing an embodiment of the present invention, and FIG. 2 is a block diagram showing the circuit configuration of the IC card of FIG. As shown in FIG. 1, the IC card 1 is formed of a thin plastic card, for example, the size of a credit card, and has a plurality of key switches 3 on its front surface for inputting various information. A liquid crystal display section 5 disposed on the key switch 3 for displaying various information, a photosensitive light receiving element 7 disposed close to the side of the liquid crystal display section 5, and an external information processing control. A plurality of contacts 9 are provided for connecting the ICC card reading and interfacing device of the device. Photosensitive light receiver 7
The key switch 3 generates an electrical output signal in response to external light, and the information input operation by the key switch 3 is enabled only when this output signal is generated.

The contact 9 has six contacts including an input/output signal contact 91, a clock contact 92, a reset signal contact 93, a power supply contact 94, a ground contact 1-95, and a write voltage contact 96.

Next, the circuit configuration of the IC card 1 will be explained with reference to FIG.

The IC card 1 has a microcomputer 11 made of an IC chip as its main component.

This microcomputer 11 has an ALU, a program R
It has a built-in OM, RAM, timer circuit, serial-parallel conversion circuit, input/output boat circuit, external address data bus circuit, etc., and performs logical control operations in the IC card 1 under the control of the program stored in the program ROM. It controls all operations such as The microcomputer 11 is further connected via an external address data bus to a memory 13 consisting of, for example, EROM, which constitutes a program area for storing other programs, etc., and is also connected to a liquid crystal control circuit 15. The liquid crystal display section 5 is connected via this liquid crystal control circuit 15. The liquid crystal control circuit 15 is a circuit for controlling the display of the liquid crystal display section 5, and is composed of a display refresh RAM, a character generator ROM, a refresh timing circuit, a driver, a power supply circuit for supplying the liquid crystal display section, and the like.

Further, the microcomputer 11 is connected from its built-in input/output port circuit to one end of each of the plurality of key switches 3 via a plurality of AND gates 17. The other end of each key switch 3 is connected to a bidirectional serial data signal path 19.
A high-level voltage signal, that is, a logic "1" signal, is supplied from the power supply circuit 21 via the power supply circuit 9 . Note that one end of each key switch 3 is connected to one input of an AND gate 17, and the other input of each AND gate 17 is connected to a photosensitive light receiving cable 7 via a constant voltage circuit 23. . As described above, the photosensitive light-receiving element 7 outputs an electrical signal when it is sensitive to light, and this electrical signal is converted by the low voltage circuit 23 into a voltage signal at the logic "1" level, and is applied to each AND gate 17. is supplied to the other input of the AND gate 17 to gate each AND gate 17. That is, each AND gate 17 is activated only when the photosensitive light receiving element 7 is gated via the constant voltage circuit 23 by an output signal generated in response to light.
The input signal from each key switch 3 connected to one input of the key switch 3 can be passed through and supplied to the microcomputer 11. In other words,
Key switch 3 caused by operating each key switch 3
The input information is valid only when the photosensitive light receiving element 7 is irradiated with light and is sensitive to the light, and is input to the microcomputer 11 and processed.

Further, the power supply circuit 21 is connected to a battery 25, and stabilizes the voltage supplied from the battery 25 and supplies it to each circuit. Further, the power supply circuit 21 is supplied with voltage from an external device via a power contact 94 and a ground contact 95, and the voltage from this external device is similarly stabilized and supplied to each circuit. However, the power supply circuit 21 has a switching circuit that switches between receiving voltage from the battery 25 and receiving voltage from an external device. The power supply circuit 21 also receives voltage from an external device via the power supply contact 94.
A reset signal for resetting each circuit in the C card 1 is received via the reset signal contact 9'3, and an initialization signal is sent to the microcomputer 1 via the lead 1a27.
1, and by releasing this processed signal, the microcomputer 11 can operate. Further, the information contact 91 and the clock contact 92 are connected to the microcomputer 11.

The write voltage contact 96 is for supplying a positive write voltage to the memory 13, but in this embodiment, it is possible to write to the memory 13 using voltage signals from the power supply contacts 1 to 94. not being used.

In the device configured as described above, when the IC card 1 is not irradiated with light and therefore no electrical signal is output from the photosensitive light receiving element 7, the gate is connected to each AND gate 17 via the constant voltage circuit 23. Since no signal is provided,
Each AND gate 17 is not energized, and even if the key switch 3 is operated and turned on during this time, the AND gate 17 blocks the high-level signal from the power supply circuit 21 that passes through the key switch 3 that is turned on. and is not supplied to the microcomputer 11. Therefore, for example, even if the key switch 3 is pressed and activated while the IC card is carried in a pocket etc., the IC card 1 is not irradiated with light at this time, so the light is not illuminated. When the sensitive light-receiving element 7 remains off, the manual information from the key switch 3 is blocked by the AND gate 17 and is prevented from being input to the microcomputer 11, which prevents incorrect information from being input to the IC card 1. The information stored inside the device cannot be erased or read. Similarly, even if the IC card 1 is inserted into the reading/writing device of the information processing control device described above, when no light is irradiated, no electrical signal is output from the photosensitive receiving light cable 7. Even if the key switch 3 is pressed down by a roller or the like and turned on, erroneous information due to this is not inputted.

FIG. 3 is a circuit diagram of an IC card according to an embodiment of the present invention. In the embodiment shown in FIG. 2, the input signal from the key switch 3 is blocked by the output signal of the photosensitive light receiving element 7 via the AND gate 17, whereas in the embodiment shown in FIG. The circuit controls the microcomputer 11 so that it does not operate by supplying a reset signal, that is, an initialization signal, to the microcomputer 11 through the power supply circuit 21 while no output signal is generated from the photosensitive light receiving element 7, and controls the microcomputer 11 so that it does not operate. While the sensitive light-receiving cable 7 is in contact with light and generating an output signal, it is controlled so as not to output a reset signal, and the microcomputer 11 is enabled to operate at this time, and the key switch 3 is This means that the input information is valid.

For this reason, as shown in the figure, the output signal from the photosensitive light receiving element 7 generated by being sensitive to light is supplied to the inverter 29 via the low voltage circuit 23 and is inverted. The output signal is supplied to the power supply circuit 21 via the OR circuit 27, and from the power supply circuit 21, it is sent as a reset signal and an initialization signal to the microcomputer 1.
1 is supplied. As a result, when the light-sensitive light-receiving element 7 is not irradiated with light, the low-level signal from the light-sensitive light-receiving element 7 is inverted by the two inverters via the constant voltage circuit 23, and becomes a high-level signal. Converted and OR circuit 27
It is supplied to the power supply circuit 21 via. Power supply circuit 21
supplies a reset signal to the microcomputer 11 in response to this high-level signal, and prevents the microcomputer 11 from operating during this time. Therefore, even if the key switch 3 is operated during this period, the input information from the key switch 3 is not received by the microcomputer 11. Furthermore, when the photosensitive light receiving element 7 is irradiated with light and the output signal from the light sensitive light receiving element 7 changes to a high level, this output signal is supplied to two inverters via the constant voltage circuit 23, and the Since it is inverted to a level signal, it is passed through the OR circuit 27 to the microcomputer 1.
1 does not act as a reset signal, the microcomputer 11 operates normally. As a result,
The microcomputer 11 operates normally, and the input information from the key switch 3 is processed appropriately by the microcomputer 11. The other circuit configuration of the embodiment shown in FIG. 3 is the same as that of the embodiment shown in FIG.

FIG. 4 is a circuit diagram of an IC card according to still another embodiment of the invention. The IC card of this embodiment differs from the embodiment shown in FIG. The operation is controlled by the output signal of the sensitive light-receiving cable 7, and this operation is the same as that of the embodiment shown in Fig. 2.The circuit configuration of the embodiment shown in Fig. The circuit configuration is the same as that of the embodiment shown in the figure.

FIG. 5 shows another embodiment of the invention. In the IC card of this embodiment, instead of energizing the AND gate 17 by the output signal of the photosensitive light receiving element 7 in the embodiment shown in FIG. The output signal drives a semiconductor switch 33 consisting of a MOSFET, etc., and the power supply circuit 2 is connected via this semiconductor switch.
The difference is that the voltage from 1 is supplied to each circuit of the IC card, and the other circuit configurations are the same as the embodiment shown in FIG.

FIG. 6 shows yet another embodiment of the invention.

In the IC card of this embodiment, instead of energizing the AND gate 17 with the J signal output from the photosensitive light receiving element 7 in the embodiment shown in FIG. Connect the output of this gated buffer 7
The output signal of the gated buffer amplifier 35 is supplied to the microcomputer 11 via the key switch 3 by energizing it with the output signal of the photosensitive light receiver 7 via the gate constant voltage circuit 23 of the amplifier 35. It is something that exists. Therefore, when the key switch 3 is operated and turned on while the gated buffer amplifier 35 is energized by the output signal of the photosensitive light receiver 7, the output signal of the buffer amplifier 35 is transmitted via the key switch 3. The information is supplied to the computer 11 and processed as valid input information.

Note that the other circuit configurations are the same as the embodiment shown in FIG.

〔Effect of the invention〕

As explained above, according to the present invention, the light-sensitive control means is provided, and the information input means such as a key switch is operated only when the light-sensitive control means generates an output signal in response to external light. This feature is enabled, so even if the key switch is accidentally operated when the key switch is not being used properly and is not exposed to light, for example, when the key switch is accidentally operated when the key switch is being carried in a pocket, etc. Key switch information due to incorrect operation will not be entered as valid information, so information stored on the IC card may be erased or
There is no problem of the device being replaced, it is highly reliable, and it is easier to carry and use.

[Brief explanation of drawings]

FIG. 1 is a front view of a tC card according to one embodiment of the present invention, FIG. 2 is a circuit diagram of the IC card shown in FIG. 1, and FIGS. 3 to 6 are respectively related to other embodiments of the present invention. It is a circuit diagram of an IC card. 1... IC card 3... Key switch 5... Liquid crystal display section 7... Photosensitive light receiving element 11... Microcomputer 17... AND gate 5th factor Figure 6

Claims (5)

[Claims] (1) In an IC card having an input means for inputting various information to a built-in integrated circuit, an output signal is generated in response to external light, and the operation of the input means is enabled by the output signal. An IC card characterized by having a light-sensitive control means. (2) The IC according to claim 1, wherein the photosensitive control means includes gate means for gating input information from the input means using the output signal.
card. (3) The photosensitive control means controls the reset state setting means for setting the integrated circuit in the reset state and the reset state setting means to release the reset state of the integrated circuit in response to the output signal. 2. The IC card according to claim 1, further comprising reset release means. (4) The light-sensitive control means includes reception control means for controlling the integrated circuit to receive input information from the input means in response to the output signal. The IC card described in Section 1. (5) The IC card according to claim 1, wherein the photosensitive control means is a power supply control means for controlling power supply to the IC card in response to the output signal.