JPH022094A - Electronic equipment - Google Patents

Abstract

PURPOSE:To prevent the destruction of data and the erroneous operation of a circuit by a method wherein the exterior of increased circuit receiving body is connected to the housing gland of electronic equipment before connectors are connected mutually when the increased circuit receiving part is inserted in the electronic equipment. CONSTITUTION:When an IC card 10 is mounted, said card 10 is inserted in the passage 1b of electronic equipment and a connector 13 is inserted in and engaged with a connec tor 3 to connect the card 10 to said equipment. Whereupon, the card 10 is directly connected to the housing gland of the electronic equipment main body and the circuit of the card 10 is connected to the gland patterns 5, 15 of the circuit on the front side of the electronic equipment main body. When the card 10 is pulled out, the rear end part of the card 10 is grasped and strongly pulled to detach the mutual engagement of the connectors 3, 13 and the card 10 can be drawn out. At this time, the glands of both circuits are disconnected after the mutual connection of the connectors 3, 13 is cut off. Therefore, the destruction of data or erroneous operation can be prevented. When static electricity is applied to the exterior of the card, a current directly flows to a chasis 2 to make it possible to prevent the destruction of data or erroneous operation.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to electronic equipment, and in particular to electronic equipment in which an additional circuit storage body such as an IC card is attached and connected to and removed from the connector via a connector. be.

[Prior Art] As this type of electronic equipment, in personal computers and various electronic equipment applied to computers, there are, for example, IC cards such as memory cards in which a memory circuit and a connector for connecting the same circuit are housed in a card-like storage body. A structure in which devices are inserted and connected in a manner that allows them to be inserted and removed has been widely adopted. When installing, connecting, and using an IC card in this type of electronic device, make sure to match the reference level (generally called ground or earth, hereinafter referred to as ground) of the potential of the IC card and the circuit of the electronic device itself. Failure to exchange signals may lead to data destruction or malfunction. For this reason, the ground pin of the connector on the electronic device side and the IC card connector is made longer than other pins, and when the IC card is inserted, the ground pin and the maggot are connected earlier than the other pins, and the I
When the C card is removed or removed, a structure is adopted in which the ground pins are disconnected after the other pins are disconnected.

[Problems to be Solved by the Invention] However, with such a structure, the structure of the connector becomes complicated and expensive. Further, there is a problem in that the position of the ground pin of each connector is restricted, and the degree of freedom in design is restricted.

On the other hand, some IC cards have an exterior made of a conductive material such as aluminum, and in this case, the exterior is connected to the ground pattern of the circuit inside the card to prevent electrostatic damage. However, if static electricity is applied to the exterior of the IC card while such an IC card is attached to an electronic device, it will be transferred from the exterior of the IC card to the electronic device itself via the ground pins of each connector and the ground pattern of the circuit of the electronic device itself. Since current flows to the chassis ground of the electronic device, the ground potential of the circuit of the electronic device and the circuit of the IC card fluctuate, which may lead to data destruction or circuit malfunction.

An object of the present invention is to solve such problems.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an electronic device in which an additional circuit storage body having a conductive exterior is detachably attached and connected via a connector. The exterior of the storage body is configured to be directly connected to the casing ground of the electronic device at a position outside of the storage body connection connector on the path for inserting and removing the storage body in the storage body mounting portion of the electronic device. did.

[Function] According to such a structure, when the expansion circuit housing is inserted into an electronic device, the exterior of the housing is connected to the electronic device's case ground before the connectors are connected to each other. The circuit of the main body of the device and the ground of the circuit of the expansion circuit housing are connected. Also, when removing the expansion circuit housing, the connectors are disconnected from each other, the housing's exterior and the electronic device's casing ground are disconnected, and the circuit ground of the electronic device itself is connected to the circuit ground of the expansion circuit housing. comes off. Furthermore, if static electricity is applied to the exterior of the additional circuit housing while the additional circuit housing is attached to an electronic device, the current due to the static electricity flows directly from the exterior of the housing to the ground of the electronic device's casing.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 and FIG. 2 are a vertical side view and a cross-sectional plan view, respectively, illustrating the structure of an IC card mounting part and an IC card of an electronic device according to an embodiment of the present invention. The mounting part is shown, and the IC card is shown on the right side.

In the structure of an IC card mounting portion of an electronic device, reference numeral 1 denotes the exterior of the main body of the electronic device, and an opening 1a for inserting an IC card is formed in the illustrated portion of the outer device. On the back side of the opening 1a, a cylindrical passage 1b for inserting and removing an IC card and accommodating the IC card is formed integrally with the outer device. There are openings 1c above and below the middle part of the passage 1b.
.

1d is formed.

A connector 3 for removably connecting an IC card is provided at the back of the passage 1b.

The connector 3 is fixed onto an end of a printed circuit board 4 that constitutes a circuit of the main body of the electronic device. Ground pins 3a and 3b at both ends of the connector 3 shown in FIG. 2 are connected to a ground pattern 5 of an electronic circuit formed on a printed circuit board 4.

On the other hand, the printed circuit board 4 is fastened with screws 6 onto an L-shaped support portion 2c cut and raised in the chassis 2 made of a conductive material as a casing ground of the main body of the electronic device. The screws 6 are conductive and are tightened onto the support portion 2C of the chassis 2 from above the ground pattern 5. That is, the ground pattern 5 is connected via the screw 6 to the chassis 2 as a case ground.

On the other hand, as a structure related to the present invention, the chassis 2 has connection parts 2a and 2b in the form of protrusions bent into an approximately U-shape for directly connecting the exterior of the IC card to the chassis ground of the chassis 2, as described later. is formed. Connection part 2a, 2
b are openings 1c formed above and below the middle part of the passage 1b, respectively.

1d so as to face the inside of the passage 1b. The connecting portions 2a and 2b are adapted to come into elastic pressure contact with the outer casing of the IC card to be mounted, as will be described later.

On the other hand, the structure of the IC card shown by reference numeral 10 in both figures is such that a printed circuit board 14 on which an electronic circuit of the IC card is mounted and a connector 13 for connecting the same circuit are supported by a frame 11 made of plastic mold, and are mounted inside an external device 2. It is fixed to . In this case, the outer device 2 is made of a conductive material such as aluminum. Furthermore, printed circuit board 1
A ground pattern 15 of the circuit above 4 is connected to the external device 2 via a conductive coil spring 16. Note that reference numerals 13a and 13b are ground bins.

When installing the IC card 10 under such a structure, the IC card 10 is inserted into the passage 1b from the opening 1a of the external device of the electronic device as shown by the arrow, the connector 13 is inserted into the connector 3, and the connector 3 is fitted. Connect. At this time, before the connectors 3 and 13 are connected to each other, the connecting portions 2a and 2b located outside the connector 3 are pressed into contact with the outer device 2 of the IC card 10, and the outer device 2 is connected to the chassis 2. That is, it is directly connected to the casing ground of the electronic device main body, thereby connecting the circuit of the IC card 10 and the ground patterns 5.15 of the circuit on the electronic device main body side.

Furthermore, when removing the IC card 10, by grasping the rear end of the IC card 10 and pulling strongly, the connectors 3 and 13 are disengaged and the IC card 10 can be pulled out. At this time, when the connectors 3 and 13 are unfitted and the connectors 3 and 13 are disconnected, the connecting portion 2a
, 2b are in pressure contact with the external device 2, and the connection between the external device 2 and the chassis 2 connects the circuit ground of the IC card 10 and the circuit ground of the main body of the electronic device. After the connectors 3.13 are disconnected, the ground connections of both circuits will be disconnected.

In this way, when inserting the IC card 10, the connector 3.1
The ground is connected before the connection of the connector 3.3, and the ground is disconnected after the connector 3.13 is disconnected at the time of disconnection, so that the data destruction and malfunction described above can be prevented.

In addition, when the IC card 10 is attached to an electronic device, the external device 2 is directly connected to the casing ground of the electronic device by pressure contact between the connecting parts 2a and 2b, so if static electricity is applied to the external device 2, A current due to static electricity flows directly from the external device 2 to the chassis 2 without going through the ground pin of the connector 3.13. Therefore, there is little change in the ground potential of the circuit of the IC card 10, and data destruction and malfunction can be prevented.

Further, according to this embodiment, since the ground connection is made as described above when inserting and removing the IC card 10, the connector 3.1
There is no need to make the three ground bins 3a, 3b and 13a, 13b longer than the other bins, the arrangement of the ground pins can be set freely, and a degree of freedom in design can be obtained.

[Effects of the Invention] As is clear from the above description, according to the present invention, in an electronic device in which an additional circuit housing having a conductive exterior is detachably attached and connected via a connector, the electronic device Since the exterior of the storage body is configured to be directly connected to the casing ground of the electronic device at a position outside the storage body connection connector on the path for inserting and removing the storage body in the storage body mounting portion of the electronic device, Data destruction and circuit malfunctions can be prevented when static electricity is applied to the expansion circuit enclosure when it is inserted or removed, or when static electricity is applied to the enclosure while it is attached.It also allows for freedom in design regarding the pin arrangement of the enclosure's connector and the connector on the electronic equipment side. An excellent effect of increasing the degree of strength can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing the structure of an RC card mounting section and an IC card of an electronic device according to an embodiment of the present invention, and FIG. 2 is a transverse plan view of the same mounting section and IC card. 1...Exterior 2...Chassis 2a, 2b
... Connection part 3.13 ... Connector 4.14 ...
Printed circuit board 5.15...Ground pattern 10...IC card 11...Frame 12...
・Conductive outer device 6...Coil spring

Claims (1)

[Claims] 1) In an electronic device that is used by attaching and connecting an additional circuit housing having a conductive exterior so as to be freely inserted and removed via a connector, the housing is connected to the housing in a path for inserting and removing the housing at the housing mounting portion of the electronic device. An electronic device characterized in that the exterior of the storage body is directly connected to a casing ground of the electronic device at a position outside the connection connector.