JPH0716304Y2 - Memory circuit protection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] Regarding a protection structure of a memory circuit, a wiring board is mounted on both sides of a mounting hole formed in a wiring board on which a memory circuit is mounted, for the purpose of fail-safe attachment and detachment of a memory card. A conductor formed of a pair of connecting pieces, one end of which is connected to the input side and the output side of the mounting detection wiring, is wired, and live connection is performed via the head of a mounting screw inserted into the mounting hole.

[Industrial application field]

 The present invention relates to a protection structure for a memory circuit.

The communication device is equipped with a memory card having a memory circuit in which a communication control program is written on the wiring board, but the stored program is not inadvertently destroyed when the memory card is replaced. There is a demand for a protective structure that can be safely performed.

[Conventional technology]

As shown in the perspective view of FIG. 3, the memory card 11 is a memory circuit 1 in which a communication control program is written on the wiring board 11a.
1b, a connector 11c for connecting to the main circuit board 2, and an attachment hole 11d for attaching to the main circuit board 2 via a spacing member 5 having screw holes 5a at both ends of the hexagonal bar.

Furthermore, when the memory card 11 is hot-swapped to the main circuit board 2, transient voltage may be transiently applied and the program may be damaged. Therefore, the memory card 11 is connected to the mounting detection circuit 2a provided on the main circuit board 2 through the connector 11c to switch ON / OFF. The switch 11e is provided.

In the memory card 11, after the changeover switch 11e is in the "OFF" state, the connector 11c is connected to the main circuit board 2, and then the memory card 11 is screwed by the mounting screw 3 via the spacing member 5. When the switch 11e is switched to "ON" after mounting, the mounting detection circuit 2a detects the mounting and the mechanically connected connector 11c is electrically connected for the first time, and the power supply on the device side and the input / output connection of the information signal are performed. Be seen.

When the memory card 11 is replaced, the switch 11e must be turned off in advance so that the connector 11c is not hot-plugged and then removed.

[Problems to be solved by the device]

However, according to the above-mentioned structure, there is a problem in that, if the connector of the memory card is inadvertently turned on and the connector is inserted or removed, a transient voltage may be transiently applied and the program may be broken. It was

In view of the above problems, it is an object of the present invention to provide a memory circuit protection structure capable of fail-safe attachment / detachment of a memory card.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the memory circuit protection structure of the present invention, the mounting side of the wiring board on which the memory circuit is mounted is provided on both sides with the input side and the output side of the mounting detection wiring of the wiring board. A conductor including a pair of connected connecting pieces is wired, and live connection is performed via the head of a mounting screw inserted into the mounting hole.

[Action]

Place the input-side connecting piece and output-side connecting piece of the mounting detection wiring on both sides of the mounting hole, and tighten the mounting screw to make the head short-circuit the input-side connecting piece and the output-side connecting piece. By replacing the conventional switch with the mounting screw so that it will be disconnected when removed, the wiring board with the memory circuit, that is, the memory card, will have the mounting screw attached and removed first before the attachment and detachment. The electrical connection between the input-side connecting piece and the output-side connecting piece of the mounting detection wiring can be reliably connected and disconnected in advance by attaching and detaching the mounting screw, regardless of the above. Can prevent the destruction of.

〔Example〕

Hereinafter, the gist of the present invention will be described in detail based on the embodiments shown in the drawings. It should be noted that the same parts as those of the related art are denoted by the same reference numerals, and duplicate description thereof will be omitted.

As shown in the perspective view of FIG. 1, the protection structure of the memory circuit 1b of the memory card 1 operates by removing the conventional switch and connecting the mounting screw 3 and the conductor 4 to each other. That is,
As shown in the enlarged exploded perspective view of the portion A of FIG. 1 shown in FIG. 2, the conductor 4 composed of a pair of connection pieces 4-1 and 4-2 divided so as to sandwich the mounting hole 1d formed in the wiring board 1a. Mounting hole 1d at the center of
And a pair of connecting pieces 4-1 and 4-2 in which leads 4b are formed at both ends of the connecting pieces 4-1 and 4-2, respectively.
Is soldered to through holes 1f respectively connected to the input side and the output side of the mounting detection wiring pattern from the mounting detection circuit 2a (see FIG. 2) (not shown).

The pair of input and output side connection pieces 4-1 and 4-2 (conductor 4) are brought into pressure contact with the head portion 3a of the screwed mounting screw 3 to be in short-circuit conduction.

In this way, the switch operation is performed by the conductor 4 (a pair of connecting pieces 4-
1,4-2) and the mounting screw 3, the mounting screw 3 is first detached when the memory card 1 is attached to or detached from the main circuit board 2. Therefore, the attaching screw 3 can be performed without care. By attaching / detaching 3, the electrical connection between the pair of connection pieces 4-1 and 4-2, that is, the attachment detection circuit 2a can be surely connected / disconnected in advance, and therefore the connector 1c is electrically connected / disconnected.
It will be done in a disconnected state, and the program will not be destroyed due to careless operation.

[Effect of device]

As described above in detail, according to the present invention, a practically extremely useful effect such that a memory card can be attached / detached in a fail-safe manner is exhibited.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment according to the present invention, FIG. 2 is an enlarged exploded perspective view of a portion A of FIG. 1, and FIG. 3 is a perspective view according to a conventional technique. In the figure, 1 is a memory card, 1a is a wiring board, 1b is a memory circuit, and 1d.
Is a mounting hole, 3 is a mounting screw, 3a is a head, 4 is a conductor, 4-1 and
4-2 shows a connecting piece.

Claims (1)

[Scope of utility model registration request] 1. A wiring board (1) on which a memory circuit (1b) is mounted.
Attach the wiring board (1d) on both sides of the mounting hole (1d)
Wire a pair of connecting pieces (4-1, 4-2) corresponding to the input side and output side of the mounting detection wiring of a) and wire the mounting hole (1
A protective structure for a memory circuit, characterized in that live connection is performed via the head (3a) of a mounting screw (3) inserted in d).