JPH01299091A - Memory card - Google Patents

Abstract

PURPOSE:To prevent the malfunction of an electric circuit due to electrostatic noise, by connecting the metal armoring potential of a memory card to the earth potential of the electric circuit using a high frequency coil and connecting the metal armoring potential of the memory card to an apparatus independently of the earth potential of the electric circuit of the memory card. CONSTITUTION:The high frequency noise due to the static electricity applied to the armoring of a memory card becomes high impedance with respect to the earth potential of the electric circuit of the memory card by the inductance due to the L-component of a high frequency coil 9 and does not invade in the earth potential 10 of the electric circuit. Since said high frequency noise is low impedance with respect to a panel potential terminal 11, the noise invades in the terminal of the apparatus using the memory card but said noise can be processed in the apparatus using the memory card. By this method, the malfunction of the electric circuit of the memory card or apparatus due to the electrostatic noise to the memory card can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an IC memory card, and particularly to the electrostatic resistance of the exterior of the memory card.

[Conventional technology]

Conventionally, the electrostatic withstand voltage on the exterior of a memory card has been reduced by using a metal material as the exterior, and connecting the potential of the metal material to the ground potential of the internal electrical circuit through a resistor. .

FIG. 5 is a sectional view of a memory card, and a conventional example will be explained using this. 1 and 2 are metal panels;
This is the exterior part of the memory card.

3 is a spacer made of an insulator for maintaining the shape of the memory card. 7 and 8 are connection conductors, which electrically connect the metal panel on the front surface and the metal portion on the circuit board 4. A resistor 6 connects the ground potential on the electrical circuit 5 and the potential of the metal panel connected by the connecting conductors 7 and 8.

[Problem to be solved by the invention]

In the conventional memory card, which connects the potential of the metal panel mentioned above to the electrical ground potential of the memory card via a resistor, static electricity discharge occurs to the surface exterior metal part of the memory card when the memory card is installed in a device and used. In some cases, high-voltage static electricity noise applied to the surface of a metal panel becomes noise in the ground potential of the memory card's electrical circuit through a resistor, which may cause a malfunction of the memory card's electrical circuit or the ground potential of the device using the memory card. This has the disadvantage of generating noise and causing malfunctions.

[Means to solve the problem]

The memory card of the present invention has a means for connecting the metal exterior potential of the memory card and the ground potential of the electric circuit using a high-frequency coil, and a device that connects the metal exterior potential of the memory card to the ground potential of the electric circuit of the memory card independently. and means for connecting.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows a first embodiment of the invention. FIG. 1 is a sectional view showing the structure of a memory card.

Reference numeral 9 denotes a high frequency coil, which connects the metal panel to the ground potential of the electric circuit. 10 is a ground potential terminal of an electric circuit connected to the outside of the memory card.

11 is a terminal for connecting the potential of the metal panel to the outside. The other configurations are similar to those shown in the conventional embodiments.

In this embodiment, high-frequency noise due to static electricity applied to the memory card exterior becomes high impedance due to the inductance due to the L component of the high-frequency coil with respect to the ground potential of the electric circuit of the memory card. Noise does not enter the ground potential, and since the panel potential terminal has low impedance, noise enters this terminal of the device that uses the memory card, but this noise cannot be processed in the device that uses the memory card. I can do it. This has the feature that it is possible to prevent the malfunction of the electric circuit of the memory card or the malfunction of the electric circuit of the device due to electrostatic noise on the memory card.

The second embodiment will be explained using FIGS. 2, 3, and 4.

For the second embodiment, as shown in FIG. 4, the metal panel and the electrical circuit ground potential are connected in series with 19 high frequency filters and 18 resistors.

FIG. 3 is a diagram showing the appearance of the memory card.

The surface of a memory card is usually printed and insulated. On the other hand, as shown in FIG. 2, 12 exposed metal parts are made on the sides of the memory card without printing.

FIG. 3 is a view from directly above when the memory card is attached to the device. In this figure, 13 memory card connector connects the electrical circuit of the memory card to the electrical circuit part of the device. 14 memory card guide is a mechanical guide when attaching the memory card to the device. A 15 metal spring is attached to the inside of this memory card guide to contact the side of the memory card and connect with the 12 metal exposed portion shown in FIG. 3 when the memory card is fully inserted.

The 16 panel potential terminal is electrically connected to a metal spring and connected to the device as a panel potential of the memory card.

In this embodiment, since the panel potential can be directly connected to the device from the metal panel of the memory card, there is no need for the panel potential terminal to use part of the electrical connection terminal of the memory card, and the electrical circuit of the memory card No wiring is required on the board. This reduces the number of connector terminals used,
As the amount of wiring on the circuit board decreases, the noise tolerance can be further improved without placing the panel potential wiring, which is a noise source, near the electrical circuit wiring. By connecting a high-frequency coil and a resistor in series, it is possible to provide resistance in terms of direct current, and even when the memory card is not connected to the memory card device, the electrical circuit can be grounded from the memory card exterior panel. It has the feature of being able to reduce noise with respect to potential levels.

〔Effect of the invention〕

As explained above, the present invention connects the metal exterior potential of the memory card and the ground potential of the internal electrical circuit through a high-frequency coil, and independently connects the metal exterior potential and the ground potential of the internal electrical circuit to the device. By having a means for connecting to the memory card, there is an effect that the electrostatic noise resistance of the memory card exterior can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining a first embodiment of the present invention, and is a sectional view of a memory card. 2, 3, and 4 are diagrams showing the second embodiment, and FIG. 2 is an external view of the memory card, showing the exposed metal portion on the side surface. FIG. 3 is a view from directly above when the memory card is attached to the device. FIG. 4 is a sectional view of the memory card. FIG. 5 is a diagram for explaining a conventional embodiment, and is a sectional view of a memory card. 1.2...Metal panel, 3...Insulating material spacer, 4...Circuit board, 5...Circuit grounding, 6... Resistance, 7.8... Connection conductor, 9, 19... High frequency Koinope 10.
...Circuit GND terminal, 11.16...Panel electronic terminal, 12...Metal exposed part, 13.
...Memory card guide, 14...Memory card guide, 15...Metal spring, 17.
...Memory card, 18...Resistor. Agent Patent Attorney Susumu Uchihara No. 1 Figure Z°C Riga'-F゛Figure 3ζ)

Claims (1)

[Claims] A memory card that has a built-in semiconductor memory element and has data input/output means or data output means, which uses a metal material for the exterior that constitutes the memory card, and has electrical parts containing the semiconductor memory element built into it. A memory card having a means for connecting the ground potential of an electric circuit including the semiconductor memory element to the exterior using the metal material via a coil, and the memory card using the ground potential of the electric circuit and the metal material. A memory card characterized by having means for independently and separately connecting the potential of the exterior to a device.