JPS6385994A - Data input and output system - Google Patents

Abstract

PURPOSE:To prevent the malfunction of an internal element even if an external light is projected on a data recording medium by providing a switch part for operating an active element only when the data recording medium is stored in a medium storing part at a prescribed position of a main body. CONSTITUTION:When a memory card 1 is inserted into the card storing part 2 of a data input and output device, a projecting part 7 turns the switch 6 on to conduct a power supply line 8 and a power supply line 9. Thereby, a power from a solar battery 4 is supplied to a memory element 5, and when a light is projected on a solar battery 4 from the light emitting part 3 of a data input and output device side, required data can be inputted and outputted from a data input and output part. When the memory card 1 is discarded from the card storing part 2, the projecting part 7 is separated from the switch 6 to turn the switch 6 off the power supply line 8 and the power supply line 9 are noncontacted. When the memory card 1 is carried, even if the light is projected on the solar battery 4, the power of the solar battery 4 is not transferred to the memory element 5, so that the memory element 5 is not operated.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a memory card in which a memory element is mounted inside the card body, and a control element in which a control element is mounted together with the memory element inside the card body. This invention relates to a data input/output system using an IC card.

(Prior Art) In recent years, various types of memory cards have been developed as large-capacity data recording media. The thickness of the memory card is 2.8 to 3.2
EEP-RO is inside the card body made of synthetic resin with a scratch level.
A memory element such as M is mounted, and data is input and retained using a dedicated data input/output device called a memory card reader/writer.

By the way, signal connections between memory cards and data input/output devices are generally made through metal contacts, but metal contacts tend to cause problems such as poor contact, so a connection method that does not rely on this is desired. An optical coupling method was proposed.

This is a method of transmitting signals using light as a medium when connecting a memory card and a data input/output device.The main body of the memory card is equipped with a solar cell and photoelectric conversion elements such as a light emitting diode and a phototransistor. A phototransistor and a light emitting diode corresponding to the light emitting diode and phototransistor, and a light emitting section for irradiating the solar cell with light are provided on the input/output device side, and data is input and output without contact.

However, in such a system, when the user is carrying the memory card or taking the memory card out of the card case during use, there is a very high possibility that the card body will be irradiated with external light. Another problem is that when external light is applied to a solar cell, electric power is induced and the internal memory element becomes operational, and when external light enters a phototransistor, the memory element may malfunction. was there.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and provides a data input/output system in which there is no risk of internal elements malfunctioning even if a recording medium is irradiated with external light. It is something.

[Structure of the Invention] (Means for Solving the Problems) A data input/output system of the present invention includes a data input/output device having a light emitting part for electromotive force at a predetermined position within a medium storage unit;
The main body has a shape that can be accommodated in the medium accommodating section, and the main body has a light receiving power generation section at a position corresponding to the light emitting section for electromotive generation, and the inside of the main body is provided with a light receiving power generating section. Data comprising an active element that is driven to perform data input/output and data holding operations, and a switch section that enables the active element only when the main body is housed in the medium storage section at a predetermined position. It consists of a recording medium.

(Function) In the data input/output system of the present invention, the switch section is turned on when the data recording medium is accommodated in the medium storage section of the data input/output device, and becomes active when light is irradiated to the light receiving power generation section in this state. The element works. On the other hand, the switch section is turned off while the data recording medium is not stored in the medium storage section.
In this state, the active element does not operate even if the light receiving and power generating section is irradiated with light.

(Example) Hereinafter, details of an example of the present invention will be described based on the drawings.

FIG. 1 is a diagram showing the configuration of one embodiment of this kojimei.

In the figure, 1 is a memory card, and 2 is a card accommodating section of a data input/output device.

A light emitting section 3 that emits light for electromotive force is provided on the upper surface of the card accommodating section 2, and a solar cell 4 is provided at a position corresponding to the light emitting section 3 on the memory card 1. A memory element 5 is mounted inside the memory card 1, and this memory element 5 performs data input/output and holding operations using power from the solar cell 4.

The memory card 1 of this embodiment is provided with a switch 6 at the end in the insertion direction. When this switch 6 is pressed by a protrusion 7 protruding from the card storage part 2, it is in the ON state, and when it is not pressed, it is in the OFF state, and when it is ON, it is connected to the solar cell 4. The positive power line 8 connected to the memory element 5 contacts the positive power line 9 connected to the memory element 5, and does not contact when the memory element 5 is turned off. Note that 10 is a negative power line connected from the solar cell 4 to the memory element 5.

In this embodiment, when the memory card 1 is inserted into the card accommodating part 2 of the data input/output device, the protrusion 7 turns the switch 6 into the
The N state is set, and the power supply line 8 and the power supply line 9 are brought into conduction. As a result, power from the solar cell 4 is supplied to the memory element 5, and when light is irradiated from the light emitting section 3 on the data input/output device side to the solar cell 4, the data input/output section (not shown)
You can input and output the necessary data from.

On the other hand, when the memory card 1 is handled from the card storage section 2, the protrusion 7 separates from the switch 6 and the switch 6 turns OFF.
state, and the power line 8 and the power line 9 are in a non-contact state.

That is, when the memory card 1 is carried, even if the solar cell 4 is irradiated with light, the power of the solar cell 4 is not transmitted to the memory element 5, so the memory element 5 does not operate. Therefore, the solar cell 4 and the data input/output section (not shown)
The memory element 5 will not malfunction even if it is irradiated with external light.

In this embodiment, the switch 6 is turned on by the protrusion 7;
Although the switch 6 is designed to be turned off, it may be any other switch as long as it turns on or off depending on whether or not the memory card 1 is inserted into the card accommodating portion 2. For example, it is possible to use a magnetic switch.

Further, in this embodiment, the power supply line of the memory element is connected and disconnected by a switch, but the operation of the memory element may be controlled by connecting and disconnecting the enable line of the memory element.

FIG. 2 is a diagram showing an embodiment in this case, and parts common to those in FIG. 1 are given the same reference numerals.

In the figure, 1 is a memory card, and 2 is a card accommodating section of a data input/output device.

A light emitting section 3 that emits light for electromotive force is provided on the upper surface of the card accommodating section 2, and a solar cell 4 is provided at a position corresponding to the light emitting section 3 on the memory card 1. A memory element 5 is mounted inside the memory card 1, and this memory element 5 performs data input/output and holding operations using power from the solar cell 4.

Furthermore, the memory card 1 is provided with a switch 6 at the end in the insertion direction, and this switch 6 is in an ON state when pressed by a protrusion 7 protruding from the card storage portion 2, and is in an OFF state when not pressed. It is designed to become. The above points are common to the embodiments described above.

In the figure, 9 is the positive power line connected between the solar cell 4 and the memory element 5, 10 is the negative power line, 11 is the enable line of the memory element 5, and 12 is the power line of the memory element 5. This is a ground line, and the enable line 11 and the ground line 12 are connected to each other so as to be disconnected by a switch 6 .

FIG. 3 is a diagram specifically showing the circuit configuration in this case.

In this figure, memory element 5 operates when its enable terminal is at ground level, and does not operate when its enable terminal is open.

That is, even if a voltage is induced in the solar cell 4 by external light, the memory cable 5 does not operate unless the switch 6 is pressed and the enable line 11 and the ground line 12 are connected.

On the other hand, when the memory card 1 is housed in the housing section 2 of the input/output device, the protrusion 7 presses the switch 6, the enable line 11 and the ground line 12 are connected, and the enable terminal of the memory element 5 is brought to the ground level. Then, the memory element 5 operates.

In each of the embodiments described above, a memory card is used as a data recording medium, but the present invention uses an I/O card that includes a control circuit (microprocessor) as well as a memory element inside the main body.
The present invention can be similarly applied to a case where a C card is used as a data storage medium.

FIG. 4 is a diagram showing the internal circuit configuration of the IC card in this case.

In the figure, 13 is the card body, 14 is the memory element, 1
5 is a control circuit (microprocessor), 16 is a solar cell, 17 is a switch that connects and disconnects the power line from the solar cell 16 to the memory element 14 and the control circuit 15, and 18 is a device that is irradiated from the input/output device (not shown) side These transistors receive optical signals for data communication. The collector of this phototransistor 18 becomes low level when light is incident thereon.

Further, 19 is an inverter that inverts the level of the collector of the phototransistor 18, 20 is an SP (serial-parallel) converter that converts the output from the inverter 19 into a parallel signal, and 21 is a register in which data converted into a parallel signal is set. It is.

22 is a register in which the data to be output placed on the data bus D is set, and 23 is a PS that converts the data set in the register 22 into a serial signal and outputs it.
(parallel-serial) conversion section, 24 is PS conversion section 23
The inverter 25 is a light emitting diode that converts the output from the inverter 24 into an optical signal and transmits it to the input/output device.

In this example, data given to the phototransistor 18 as an optical signal from the input/output device side is transmitted to the memory element 14.
The control circuit 15 executes necessary data processing, and the data to be transmitted to the input/output device is written to the light emitting diode 25.
is output as an optical signal to the input/output device. .

At this time, when the switch 17 is in the ON state, power from the solar cell 16 is applied to the memory element 14, but when the switch 17 is in the OFF state, the same power is not applied to the memory element 14.

Therefore, if the switch 17 is turned ON only when the card body 1 is housed in the housing part of the input/output device, the memory element 14 and the control circuit 15 will not malfunction when the card body is carried.

In each of the embodiments described above, if it is necessary to back up the memory element, it is conceivable to always use the backup power source and turn on and off the power only to the circuit necessary for writing to the memory element using a switch.

[Effects of the Invention] As explained above, in the system of the present invention, the function of the switch section enables the active elements inside the data recording medium to operate only when the data recording medium is accommodated in the storage section of the data input/output device. Since the active element becomes inoperable when the data recording medium is not housed in the medium storage section of the data input/output device, there is no risk of the active element malfunctioning even if the data recording medium is irradiated with external light. .

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the system of the present invention, FIG. 2 is a diagram showing another embodiment of the present invention, and FIG. 3 is a diagram showing the internal circuit configuration of a data storage medium used in the embodiment of the present invention. FIG. 4 is a diagram specifically showing the internal circuit configuration of a data storage medium used in an embodiment of the present invention. 1...Memory card 2...Data input/output device 3...
...Light emitting part 4.16...Solar cell 5.14...Memory element 6.17...Switch 7...Protrusion part Fig. 1

Claims (5)

[Claims] (1) A data input/output device having a light emitting part for electromotive generation at a predetermined position in a medium accommodating part, and a main body having a shape that can be accommodated in the medium accommodating part, and the main body having a light emitting part for electromotive generation at a predetermined position in the medium accommodating part. a photovoltaic power generating section at a position corresponding to the main body; an active element that is driven by the electric power from the photovoltaic power generating section to perform data input/output and holding operations; 1. A data input/output system comprising: a data recording medium having a switch section that enables the active element only when the medium is accommodated in the medium storage section. (2) The data input/output system according to claim 1, wherein the switch section of the data storage medium is a switch that connects and disconnects a line that supplies power from the photovoltaic power generation section to the active element. (3) The data input/output system according to claim 1, wherein the switch section of the data storage medium is a switch that connects and disconnects the enable line of the active element. (4) The switch section of the data storage medium has a function of operating the active element only when receiving a pressing force from the outside. Data input/output system. (5) The data input/output system according to claim 4, wherein a protrusion for pressing the switch part is provided at a position corresponding to the switch part of the data recording medium in the medium storage part of the data input/output device. .