JPS61198488A - Magnetic bubble memory cassette - Google Patents

Abstract

PURPOSE:To attain easier constitution of the titled cassette by constituting the titled cassette of a connector which has a grounding electrode whose voltage potential is equal with that of plural connector pin leads, and connecting the cassette to the host equipment. CONSTITUTION:A cassette housing 1 made by resin molding has an opening part for terminal in its one side in which many connector pin leads 3 that lead the internal-device circuit are located. A printed circuit board 9 is mounted inside the housing 1, on which a memory device 5 comprising a bubble memory chip and a function circuit for chip-driving; and an interface circuit necessary to connect with the data bus of the equipment, etc. are equipped. The grounding electrode 10 is connected to a ground conductor circuit 11 inside the housing 1. When the cassette body is pulled out from an cassette holder, the ground electrode 10 is short-circuited with the connector pin leads 3 and goes to grounded state. Because all the connector terminals of the cassette are kept to equal potential at all time, the break of the memory device drive due to the static charges in the logical circuit is prevented. Therefore, the protection of stored data is made possible by a simple means.

Description

[Detailed Description of the Invention] [Industrial Application Field] A memory device that uses magnetic bubbles generated in a uniaxially anisotropic rare earth iron garnet single crystal film as a storage medium.
In particular, the present invention relates to a magnetic bubble memory cassette that protects a portable memory cassette from being destroyed by charging.

The present invention provides a highly reliable memory that completely eliminates damage to, for example, logic circuits driving memory media and control electrodes (generates, replicators, swap gates) in bubble memory devices due to electrostatic charging of resin-molded cassette casings. This was done at the request of the device.

[Conventional technology]

Such a memory device is a storage medium bubble memory chip;
The chip-driven peripheral circuitry is housed inside a cassette housing made of resin. The device-accommodating cassette body has a large number of connector pin leads (terminals) led out from one side of the casing, and the power supply for driving the chip and the reading or writing of stored data information are carried out through the connector provided in the cassette holder section on the host device side. It operates by connecting to the circuit.

FIG. 3 is an equivalent circuit diagram illustrating an example of a conventional electrostatic protection measure for a cassette body.

In the figure, 1 is a cassette housing, 2 is a connector having a large number of pin leads 3 attached to one end of the housing 1, and 5 is a cassette housing.
is a memory device housed inside the housing. Also, 6
is a relay comprising a coil 7 and a number of contacts 8, and the contacts 8 are connected to the input circuit 4 of the device 5 and the pin lead 3 of the connector.
This is a normally open contact inserted between the two.

As is clear from the circuit diagram in FIG. 3, the circuit of the memory device 5 housed in the housing 1 is cut off at the open contact 8, so even if the high-voltage static electricity that accompanies charging of the housing is applied to the pin leads 3 exposed on the side. Even if voltage is applied, charging of the gate circuit for driving the device is prevented, and the device and stored data can be protected.

[Problem that the invention seeks to solve]

The above-mentioned exemplary circuit exemplifies electrostatic protection measures for a memory device in which a relay is installed in a memory cassette, but the second object of the present invention is to provide an electrostatic protection means with a simpler structure.

[Means for solving problems]

According to the present invention, in a cassette body for accommodating a bubble memory device provided with a plurality of connector pin leads connected to a host device side, the connector structure includes a ground electrode that brings the plurality of connector pin leads to the same potential. It is used to connect to the host device.

[For production]

At all times, the connector pin lead of the cassette body is connected to the ground electrode, and all circuits, such as device input circuits, are at ground potential at all times, so that the device control thin film logic circuit, such as the gate circuit, can be protected from electrostatic damage.

When the ground electrode is connected to a host device.

There is no problem since it is released from the connector pin lead.

〔Example〕

Hereinafter, three embodiments of the present invention will be described in detail with reference to side sectional views of a cassette connection configuration shown in FIGS. 1 and 2.

The side cross-sectional view in FIG.
Fig. 2 shows the respective configurations of l.

FIG. 1 is a side cross-sectional view of the cassette body when the connector is inserted in the direction of the arrow and connection is completed;

The cassette housing 1, which is formed by resin molding, has terminal portions formed on the negative side (left side in the figure) for leading out internal device circuits by a large number of connector pin leads 3.

A printed circuit board 9 is mounted inside the casing, and the circuit board 9 includes:
5. A memory device containing a bubble memory chip, a function circuit for driving the chip, etc. Interface circuits and the like necessary for connection to the device data bus are implemented.

(a) In the figure, reference numeral 10 denotes an earth non-electrode made of a spring conductor and formed along with the connector pin lead 3.

The electrode 10 is connected to a ground conductor circuit 11 inside the housing. When the cassette body is always removed from the cassette holder, the ground electrode 10 is electrically connected to the pin lead (terminal) 3 of the connector, creating a ground short circuit state.

In this way, all the connector terminals of the i-cassette are always at the same potential, so that the logic circuit for driving the memory device is prevented from being destroyed by electrostatic charging.

However, when the ground electrode 10 is connected to the connector 13 of the host device side cassette holder section 12 shown in FIG. That is, the ground short-circuit condition is resolved by the insulation coating 15 formed on the top surface of the bottle lead 14 of the holder-side connector 13.

FIG. 2 is a side sectional view after the connector connection is completed and the grounding short-circuit condition of the ground electrode 10 is released.

As mentioned above, when the bubble memory cassette body of the present invention is inserted into the device side cassette part, the spring conductor electrode 10 for shorting to ground is opened, so that reading or writing of data stored in the cassette can be performed in the same way as in the conventional case. It will be done.

(Effects of the Invention) As explained above, according to the electrostatic protection method for a memory cassette body of the present invention, the data stored in the device can be protected by a simpler means than the conventional method, so an inexpensive cassette body can be used. provided.

[Brief Description of the Drawings] Figure 1 (Figure 81 and Figure BL are respectively sectional side views of the connection structure of the cassette of the present invention, the conductor, and the host device side cassette holder section. Figure 2 is a completed connector connection of the cassette body. Fig. 3 is an equivalent circuit diagram that provides static electricity protection for a conventional cassette body. In the figure, 1 is the cassette housing, 2 is a connector, 3 is a pin lead, and 5 is a memory device. 10 1 is a ground electrode, 11 is a grounding part, and 13 is a pin lead connected to the pin lead 3.

Claims (1)

[Claims] A magnetic cassette body for housing a bubble memory device provided with a plurality of connector pin leads for connection to a host device, characterized in that the connector includes a ground electrode that brings the plurality of connector pin leads to the same potential. Bubble memory cassette.