JPH05342423A - Data processor - Google Patents

Abstract

PURPOSE:To speedily detect inserting and ejecting operations and to electrically interrupt between a main body device and an IC card because the latch-up destruction of elements or massive through currents are generated in the case of inserting and ejecting an IC card while leaving the power source of the main body device turned on. CONSTITUTION:This device is provided with an eject button 10 equipped with a notch 11 for ejecting an IC card 1, mobile detector 13 for detecting the notch 11, conversion circuit for converting the detected result to an electric signal, and cut-off circuit for electrically cutting off the main body device and the IC card 1 based on the converted result. The mobile detector 13 is set at a position, where pushing-down is canceled by the notch 11, and can detect inserting/ejecting start and fitting completion. At the time of starting inserting and ejecting, the main body device and the IC card are cut off and at the time of completing fitting, the cut-off is canceled by these circuits.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing device which uses a storage medium such as an IC card as an auxiliary device.

[0002]

2. Description of the Related Art In recent years, IC cards have been increasingly used as an auxiliary device of a data processing device. In many cases, such a data processing device is provided with an eject button in order to easily remove the IC card. The user can easily remove the card by operating this button. A conventional data processing device having this eject button will be described with reference to the drawings.

FIG. 4 is a partial structural view of an IC card insertion portion of a conventional data processing device. As shown in the figure, the data processing device uses an IC as a mechanism for using an IC card.
IC card 1 and fitting part 2 into which card 1 is inserted and fitted
It is composed of a card case 3 that holds the whole, an eject plate 4 that contacts the base of the IC card 1, and an arm 6 that connects the eject plate 4 and the eject button 5. The arm 6 is connected to the card case 3 by the fulcrum a 7, the eject plate 4 by the fulcrum a 8, and the eject button 5 by the fulcrum c 9.

The operation of the data processing apparatus configured as described above will be described below. First consider the insertion of an IC card. When the IC card 1 is inserted along the card case 3, the base of the IC card 1 comes into contact with the eject plate 4 before the pins are fitted together. Eject plate 4
Is pushed in until the IC card 1 is fitted,
The fulcrum a8 is pulled toward the fitting portion 2 side. The fulcrum c moves around the fulcrum a in the direction opposite to the fulcrum a8, and the eject button 7 is pushed out. When the eject button 7 is pushed in the reverse procedure when removing, the eject plate 4 pulls out the IC card 1.

As described above, the eject button facilitates the removal of the card, but it can be always touched from the outside regardless of the operating state of the data processing device, and the hot-line insertion / removal by the user (power supply It is necessary to newly consider how to insert and remove the IC card while it is still inserted. In the conventional general data processing device, the power supply pin and the ground pin of the mating part are made longer than other signal pins, and these pins are designed to be mated earlier than other signal pins and to be removed later. There is. This eliminates the moment when a voltage exceeding the power supply voltage or a voltage lower than the ground voltage is applied to the signal of the IC card internal element, and latch-up of the IC card internal element can be avoided.

[0006]

In the conventional data processing apparatus as described above, although the length of the pin of the fitting portion is changed to avoid latch-up as described above, The measures themselves can cause other problems. In other words, since the power supply and ground pins are long, the time during which the input signal level becomes indefinite while the power supply voltage is applied during movement occurs on the order of milliseconds, and a large through current continues to flow in the IC card. .. This is I
If not only the long-term reliability of the C card is impaired, but also the power supply circuit of the data processing device cannot supply this through current,
This may cause fluctuations in the power supply voltage of the system and may cause malfunctions. Some IC cards have an internal pull-up or pull-down resistor to fix the signal level to suppress shoot-through current, but this leads to an increase in power consumption during normal operation, making it unsuitable for battery operation, or for data processing devices. In many cases, resistance addition is not allowed because it conflicts with the system specifications, and it is not a solution in such cases. The fundamental countermeasure when removing the signal pins is to detect the removal of the signal pins in advance and shut off the power supply and signals between the IC card and the data processing device simultaneously and as quickly as possible. Is to release the cutoff after the mating is completed.

The data processing device of the present invention aims to solve the problems of latch-up and shoot-through current by detecting the movement of the eject button and taking the above-mentioned fundamental countermeasures.

[0008]

In order to achieve the above-mentioned object, a data processing apparatus of the present invention comprises an eject button which is interlocked with an operation of inserting and removing a storage medium into and from an electric device body, and a movement for detecting the operation of the eject button. A detector, a conversion circuit that detects, by the movement detector, that the storage medium has started to be removed from the electric device body or has been inserted into the electric device body, and that converts the signal into a cutoff permission signal or a connection permission signal, and the conversion circuit. And a disconnection connection circuit for electrically disconnecting or connecting the storage medium and the main body of the electric device based on the disconnection permission signal or the connection permission signal.

[0009]

In the data processor of the present invention, the movement detector is an IC.
Since the movement of the card is detected, the insertion / removal of the IC card can be known. Upon removal, as soon as the movement detector detects the start of removal, the conversion circuit generates a cutoff permission signal, and the cutoff circuit electrically cuts off the IC card. Since the process from the detection of the start of removal to the interruption is electrically performed instantaneously, the interruption can be completed before the removal of the signal pin of the IC card. In the case of insertion, if the removal operation is reversed in time, the removal start timing corresponds to the insertion completion timing, so that the disconnection is released after the signal pin insertion is completed and the signal pins are electrically connected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the data processing device of the present invention will be described below with reference to FIGS. 1, 2 and 3.

FIG. 1 is a partial structural view of an IC card insertion portion of a data processing device of the present invention. As shown in the figure, the data processing device has a fitting portion 2 into which the IC card 1 is fitted, a card case 3 that holds the entire IC card 1, and I as in the conventional example.
An eject plate 4 for removing the C card 1, an arm 6 for connecting the eject plate 4 and the eject button 10, and a fulcrum 7 of the arm 6 are provided. The difference from the conventional example is that in addition to the conventional example, a notch 11 is provided on the side surface of the eject button 10, and a spring 12 that has a length equal to or less than a natural length when the eject button 10 is pushed out is provided at the bottom of the eject button 10. It is a point provided in. A two-pole push switch type movement detector 13 is installed on the opposite side of the notch 11, and only when the IC card 1 is completely fitted, the tip of the movement detector 13 switch is placed inside the notch 11. It is positioned, and the depression of the movement detector 13 is released (that is, the switch is turned off and the two poles are opened). This position is adjusted so that the movement detector 13 is pushed along the slope of the cutout 11 (that is, the switch is turned on and the two poles are short-circuited) if the fitting is loosened even a little. One pole of the movement detector 13 is grounded to the ground in the data processing device, and the other is used as a removal detection signal 14 in a conversion circuit described later.

FIG. 2 is an enlarged view of the relationship between the notch 11 and the movement detector 13 when the IC card 1 is completely fitted to the fitting portion 2. Point p is the movable tip of the movement detector 13. , H is the distance between the point p and the main body of the movement detector 13, a is the distance between the eject button 10 and the main body of the movement detector 13, b
Is the distance between the deepest part of the notch 11 and the main body of the movement detector 13, and x is the eject button 10 on the slope of the notch 11.
Indicates the distance in the pushing direction. In addition, the movement detector 13
For a certain value c, when h ≧ c or more, it is turned off, and when h <c, it is turned on, and a and b are determined so that b>c> a.
Furthermore, in the following description, a value to be compared with x, that is, IC
The pin fitting length of the card 1 and the fitting portion 2 is y here.

The operation of the mechanical portion of the present invention having the above structure will be described. Since the operation of moving the IC card is exactly the same as the conventional example, the description thereof is omitted.

As described above, FIG. 2 shows a state in which the IC card 1 is completely fitted. At this time, the point p is the cutout 1
Located at 1, h = b. Therefore, the movement detector 13 is off. When the eject button 10 is pressed in this state, the point p starts moving along the slope of the notch 11 and h
Is reduced. After that, at the moment when h = c, the movement detector 1
3 is turned on, and removal is detected while the movement distance is smaller than x. There is a proportional relationship between the moving distance between the eject button 10 and the IC card 1 with the fulcrum a7 as the center of the lever, but this moving distance is assumed to be 1: 1 (that is, fulcrum a7 to fulcrum a8, fulcrum). (The distance from 7 to the fulcrum C is equal)
In that case, the movement detector 13 is guaranteed to be turned on before the pins of the IC card 1 are removed by simply satisfying the relation of y> x. If it is desired to take a large value of x in consideration of tolerances and the like, the distances of the fulcrums 7 to 8 can be shortened so that the movement distance of the IC card 1 with respect to the eject button 10 becomes small. In any case, the movement detector 13 of the present invention provides the timing basis for taking electrical measures while the pins are still mated.

FIG. 3 is an electric circuit diagram of the detecting portion of the data processing apparatus of the present invention. The conversion circuit 15 is composed of one resistor 16 that pulls up the removal detection signal 14 notified from the movement detector 13 to the power supply of the data processing device. That is, the cutoff permission signal 17 generated by the conversion circuit 15 is merely a signal obtained by pulling up the removal detection signal 14 with the resistor 16. A cutoff circuit 18 controlled by the cutoff permission signal 17
Is composed of a plurality of analog switches 23 that are inserted in series between the device-side signal 19 and the IC card-side signal 20 and between the device-side power supply 21 and the IC card-side power supply 22.
The analog switch 23 is a high-speed type in which the cutoff permission signal 17 is turned on (signal passing) when it is at a high level and turned off (signal is cut off) when it is at a low level, and this reaction is performed on the order of nanoseconds.

The operation of the above configuration will be described. First, consider the time of removal. Since the IC card 1 is now completely fitted with the fitting portion 2, the movement detector 13 described above is off, and the removal detection signal 14 is at a high level by the resistor 16. Therefore, the cutoff permission signal 17 also becomes high level, the analog switch 23 remains on, the cutoff by the cutoff circuit 18 does not occur, and the IC card 1 is in the normal operation state.
When the removal is started from this state as a starting point, the movement detector 13 is turned on, and the removal detection signal 14 is grounded and becomes a low level. The cutoff permission signal 17 is also cut off, the analog switch 23 is turned off, the cutoff circuit 18 operates, and the IC card 1 is electrically cut off from the data processing device. Since the analog switch 23 is turned off very quickly, the shoot-through current generated is so small that it can be ignored. Therefore, there is no deterioration of the IC card 1,
Since the power supply circuit of the main body of the data processing device is not burdened, neither fluctuations in power supply voltage nor malfunctions are induced. Regarding the latch-up, since the IC card side signal 20 and the IC card side power supply 22 are turned off at the same time within a short time of nanosecond, consideration is virtually unnecessary.

Next, consider insertion. Assume that the IC card 1 is not present. At this time, the eject button 10 is settled in the pressed state as the spring 12 tries to return to the natural length. By satisfying this assumption, the subsequent insertion operation can be considered as a temporal reversal of the removal operation, and the removal start timing corresponds to the insertion completion timing. Therefore, it is guaranteed that the IC card and the data processing device are electrically connected only after the insertion is completely completed. In this way, the problems of latch-up and shoot-through current are eliminated even during insertion.

The movement detector of the present invention may be a lever type switch which is tilted at the edge of the cutout. The notch may also be a protrusion, and in this case, the on / off operation of the switch is reversed, so that the analog switch has the opposite on / off logic. When it is a protrusion, the switch can be a slide type. Furthermore, replacement with an optical switch is also conceivable. This is because the switch can be turned on and off by blocking and passing the light beam by moving the notch. In this example,
Although the movement detector is provided on the side surface of the eject button, it may be provided on the bottom side of the eject button. In this case, when the eject button is pressed, the movement detector may be directly pressed by the eject button. Similarly, the movement detector can be provided at an arbitrary position of a member that moves with the movement of the eject button, such as both ends of the fitting portion or a place where the movement detector is pushed by the eject plate.

Further, the analog switch of the cutoff circuit may be composed of a buffer IC having a tristate off state or a transceiver IC. At this time,
The IC may be turned off by the cutoff permission signal. This is particularly effective when such an IC originally exists due to the circuit configuration of the data processing device.

[0020]

As can be seen from the above embodiments, the movement detector of the data processing apparatus of the present invention detects insertion / removal from movement of the eject button and instantaneously shuts off the IC card before the signal pin is removed. It provides a basic solution to the problems of conventional data processing devices, which must wait passively for removal. In addition, because of its configuration, insertion and removal can be regarded as a temporal reversal operation, and the problems of latch-up and shoot-through current are solved regardless of insertion and removal.

Thus, according to the present invention, a simple structure,
The circuit can eliminate the conventional trade-off between latch-up at the time of insertion and removal and countermeasures against shoot-through current, and can greatly improve the reliability of the system.

[Brief description of drawings]

FIG. 1 is a partial structural diagram of an IC card insertion portion of a data processing device of the present invention.

FIG. 2 is a detailed view of a detector unit of the data processing device of the present invention.

FIG. 3 is an electric circuit diagram of a detection unit of the data processing device of the present invention.

FIG. 4 is a partial structural diagram of an IC card insertion portion of a conventional data processing device.

[Explanation of symbols]

 10 Eject Button 11 Notch 13 Movement Detector 15 Conversion Circuit 18 Break Connection Circuit

Claims (1)

[Claims] 1. An eject button that interlocks with an operation of inserting and removing a storage medium into and from an electric apparatus body, a movement detector that detects an operation of the eject button, and a movement detector that starts to remove the storage medium from the electric apparatus body. And a cutoff circuit for electrically cutting off the storage medium and the electric device body based on the cutoff permission signal converted by the conversion circuit. Data processing device.