JPH01237783A - Connecting system for electronic equipment - Google Patents

Abstract

PURPOSE:To improve a connecting environment and to guarantee the operation of an IC card by causing the length of a pin in a connector to be three steps and gradually connecting an electronic equipment main body and the IC card with the three types of timings. CONSTITUTION:When an IC card 200 is inserted into a male connector 3 of an electronic equipment 100, at first, a pin 6a and a inserting port 16a are electrically connected. At such a time, when there is potential difference between the main body 100 and a grand level in the card 200, a charge to correspond to the potential difference is discharged namely, a current flows between the both of them. Since the current at such a tie flows through resistors 5 and 15, the potential different between the both of than does not go to be '0' immediately but the difference proceeds at a comparatively low speed. In a process to further insert the card 200, the grand level of the both go to be almost same. Thus, this time, in a step to insert pins 6b and 6b' to inserting holes corresponding to a male connector 13, grands 4 and 14 between the both go to be a connecting condition for the first time and the wholly same level.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connection method for electronic devices, and more particularly, to a connection device for electronic devices that connects a powered-on electronic device to another electronic device.

[Prior Art] With the development of today's semiconductor manufacturing technology, the information society has increased the demand for portability and ease of handling, etc., and the use of card-type electronic devices such as IC cards (hereinafter simply referred to as IC cards) has increased. It has become.

Usually, an IC card is used as an extended memory of the main body of an electronic device (hereinafter simply referred to as the main body), or even as an extended character font ROM when the connected side (main body) is a printing device. It is expected to be used in a variety of ways.

Derode・Only the 10 card itself・Earth (Earth)
The ground (GND) line, which is floating above the card and has a reference potential within the card, has a capacitance between it and the ground, and may become charged for some reason.

On the other hand, some of the main bodies to be connected are provided with a ground terminal, while others are not.

In any case, before the main body and the IC card are connected, there is often a potential difference between them.

Therefore, conventionally, when inserting an IC card into the main body, the connection was made through two steps. The first step is to connect the card and main body ground bins to eliminate potential differences between these devices. In the second step, I connected the power lines and various signal lines.

[Problems to be Solved by the Invention] However, if there is a potential difference between the ground levels of the IC card and the main body, and these ground lines are connected, a sudden current will flow at that moment.

Normally, the capacitance on the main body side is very large, so the potential change on the main body side at the moment of connection hardly changes. However, I
On the other hand, since the capacity of the C card is small, the potential inside the card changes rapidly at the moment of connection, and as a result, current flows to unexpected places, which may destroy the contents of the memory inside the card. , a problem occurs in which the circuit inside the card malfunctions.

The present invention has been made in view of the related art, and aims to provide a connection method for electronic devices that protects electronic devices during connection and prevents malfunctions.

[Means for solving the problem] In order to solve this problem, the present invention includes the configuration shown below. In other words, in an electronic device connection method that connects at least two electronic devices, the connection is performed in the first connection step while suppressing the flow of current generated from the potential difference between the corresponding reference voltage signal lines of each electronic box. a first connection means for connecting said corresponding reference voltage signal in a second connection step; and a third connection means for connecting various signal lines between electronic devices in a third connection step.

[Operation] In the configuration of the present invention, the first connecting means connects the reference voltage signal lines of each electronic device while suppressing the current generated from the potential difference, and the second connecting means connects the reference voltage signal lines. Connecting.

The third connection means connects various signal lines.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a top view of the vicinity of the connection connectors of the electronic device main body 100 and the IC card 200 in the embodiment (
Partially transparent) is shown.

In the figure, 1 is an outer frame of the electronic device main body 100, and 2 is a printed circuit board of the electronic device. 3 is a male connector for card connection, and screws 7a and 7b connect the printed circuit board 2 and the outer frame 1.
and is fixed. 4 is a ground line on the printed board and 2.

In addition, the card connection connector 3 has a plurality of connection bins (
One end is soldered to the printed circuit board 2) protrudes, and each bottle has three lengths in the embodiment. In the illustrated case, the relationship is 6a>6b (=6b')>6c.

Of these, the bin 6b is directly connected to the ground line 4, and the bin 6a is connected to the ground line 4 via a current limiting resistor 5. Incidentally, the bottles of the same length, including the bottle 6C, are connected to various control lines located on the back side of the printed circuit board 2 through through holes.

On the other hand, the IC card 200 is protected by the outer frame 11,
There is a printed board 12 in which various ICs and memory elements are mounted, and a female connector 13 into which various bottles are inserted into the male connector. A conductive film is attached to the inner wall of each fitting hole of the female connector 13, and when each pin of the male connector 3 is fitted into the corresponding fitting hole of the female connector 13, the two are electrically connected. It is configured so that

Among these fitting holes, the conductive coatings in the fitting holes 16b and 16b' corresponding to the bottles 6b and 6b' are directly connected to the ground line on the printed circuit board 12,
The insertion hole 16a corresponding to a is a current limiting resistor 1.
5 to ground 14. The other fitting holes are connected to various ICs, memory elements, etc. on the printed circuit board 12.

The principle of operation when connecting the IC card '200 of the embodiment to the electronic device 100 in the above-described configuration will be explained below with reference to the circuit shown in FIG.

Connect the IC card 200 to the male connector 3 of the electronic device main body 100
As it is inserted into the inside, first, the bottle 6a and the insertion hole 1 are
6a is electrically connected. At this time, the electronic device main body 1
If there is a potential difference between 00 and the ground level within the IC card 200, the charge corresponding to the potential difference is discharged, that is,
Current will flow between the two. However, since the current at this time flows through resistor 5 and resistor 15,
The potential difference between the two does not go to zero suddenly, but progresses at a relatively slow speed. Then, in the process of further inserting the IC card 200, the ground levels of both become approximately the same level. In this way, when the pins 6b and 6b' are fitted into the corresponding fitting holes 16b and 16b' of the female connector 13, the grounds 4 and 14 between them are completely connected and are at the same level. . Below, further 1. C
As the card is inserted, various control lines 30 and 31 are connected, and the operation of the IC card 200 is guaranteed. In the embodiment, the resistor 5 required for current limitation was also provided in the main body of the electronic device, but the resistor 1 in the IC card 200
5 alone can sufficiently achieve its effects.

Now, in the above example, a case where electronic devices are directly connected to each other has been explained, but it goes without saying that the present invention can also be applied to a case where two electronic devices are connected via a cable, for example. Therefore, it can be adapted to any type of connector when there are two electronic devices and these two electronic devices are connected.

In addition, the timing of the first contact is not with the pin of the connector on the main body side, but with the length of the conductive coating inside the insertion hole on the card side. Of course, it is also possible to provide a resistor of some degree mixed therewith and connect it to each ground. This is because the same effect as that of the outer periphery of each connector being brought into contact before each signal is electrically connected can be achieved.

Furthermore, the signal line that comes into contact with it for the first time has not only a resistance, but also a resistance.
Since an element including an inductance or the like may be used in some cases, it is not necessarily limited to a resistor as in the embodiment. Furthermore, it may be more effective to use a specific signal line such as a power supply line instead of grounding the signal line that is first connected.

As explained above, according to this embodiment, the length of the connector pin is set to three levels, and the connection environment between the electronic device main body 100 and the IC card gradually improves at three different timings. The operation of the IC card (memory contents will not be destroyed, etc.) is guaranteed.

[Effects of the Invention] As described above, according to the present invention, since the connection operation progresses while gradually establishing a connectable state, the operation of the electronic device is guaranteed.

[Brief explanation of the drawing]

Figure 1 is a top view of the vicinity of the connector between the electronic device and IC card in the example, Figure 2 is a sectional view of the relationship in Figure 1 seen from the side, and Figure 3 is the electronic device and IC card in the example. FIG. 2 is a diagram showing an isochoric circuit of a connector of an IC card. In the figure, 1 and 11...Outer frame, 2 and 12...Print board, 3 and 13...Connector, 4 and 14...
Ground line, 5 and 15...Resistance, 68~6G・
...Bin, 7a and 7b...Screw, 16a-16c.
...Inset hole, 3o and 31...signal line, 10o...
Electronic equipment...IC cards. Patent applicant Canon Co., Ltd. Figure 1

Claims (1)

[Claims] In an electronic device connection method that connects at least two electronic devices, the flow of current generated from the potential difference between the corresponding reference voltage signal lines of each electronic device is suppressed in the first connection step. a first connection means for connecting the corresponding reference voltage signal lines in a second connection step; and a second connection means for connecting various signal lines between electronic devices in a third connection step. A connection method for electronic equipment characterized by having three connection means.