JPS5911982B2 - magnetic bubble memory device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a magnetic valve memory device (hereinafter referred to as a device), particularly a device in which a magnetic valve memory chip (hereinafter referred to as a chip) is molded with resin.

In general, a device mainly consists of a chip, a coil that applies a rotating magnetic field to the chip in the horizontal direction, and a magnet block that applies a bias magnetic field to the chip in the perpendicular direction.

FIG. 1 is a sectional view of a main part showing an example of a conventional device, and FIG. 2 is a sectional view taken along line 1-1' in FIG.

10 In these figures, 1 is a shield case made of a high permeability magnetic material such as permalloy, and 2 is a shield case that propagates electrical signals between the circuit inside the chip 3 and the external circuit, which is disposed between the shield cases 1 placed opposite each other. 4 is a side cap that covers the open end 15 of the shield case 1;
Reference numeral 5 denotes a permanent magnet block that is closely arranged on the opposing inner surface of the shield case 1 to apply a bias magnetic field to the chip 3, and 6 is a package in which the chip 3 and a rotating magnetic field generating coil are mounted between the opposing faces of the shield case 1. Ariko 2
One end of the lead pin 2 is connected to the end of the 0 package 6.

7 is the magnet block 5,
This is a molded part in which the package 6 and the like are molded with resin.

Devices with such a configuration have features such as small size, large capacity, and high reliability.However, in order to compete with other competing memories, such as disk memory and drum memory, the unit price per bit must be reduced. need to be reduced.

For example, as a means of reducing the cost of the above-mentioned device, a device having a structure in which the side cap 4 is removed as shown in 30 shown in a sectional view of the main part in FIG. 3 has been proposed. However, devices with such a configuration have the following problems.

That is, when actually using the device, drive 3
It is mounted on a printed circuit board on which five circuits are formed.
When this mounted device is subjected to vibration or impact, the lead pins 2 on the Cl are deformed at their bent portions and come into contact with the ends of the shield case 1, causing the memory to fail. Yesterday becomes impossible.

For example, since the detection output of a magnetic bubble is an extremely small value of about 4 mV, when the detection lead pin 2 comes into contact with its shield case 1, the bubble output voltage will generate noise several tens of times compared to the magnetic bubble output voltage. They overlap, making the read operation completely impossible. Furthermore, if the adjacent lead pins 2 for driving the rotating magnetic field are short-circuited, the IC of the rotating magnetic field current generating circuit will be destroyed. As explained above, when the side cap is removed from the conventional device shown in FIG. 2, desirable results cannot be obtained, such as the memory operation becoming impossible or the drive circuit being destroyed. Therefore, the present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to eliminate the side cap and prevent contact between the lead pin and the shield case, thereby realizing cost reduction. The purpose is to provide devices.

In order to achieve such an object, the present invention is configured such that the outer shape of the molded portion is larger than the outer shape of the shield case.

The device according to the present invention will be explained in detail below using the drawings. FIG. 5 is a sectional view of a main part showing an example of a device according to the present invention. Since the same symbols as in FIGS. 1 and 2 represent the same elements, a description thereof will be omitted. In the figure, the end portion of the resin molded portion 8 is formed to protrude from the outer shape of the shield case 1. That is, in the direction in which the lead pins of the device are drawn out, when the length of the shield case 1 is E, and the length 5 of the mold part 8 is 12, the mold part 8 should protrude by the length of the shield case 1 by the length of the furnace 6. A resin mold portion 8 is formed by filling with resin. The end of the shield case 1 is formed so as to be on the inside of a straight line connecting the lead-out end of the lead pin 2 from the resin mold part 8 and the lower end of the side surface of the resin mold part 8. According to such a configuration, when the lead pin 2 is deformed due to vibration, impact, etc. of the device as shown in FIG. There is no direct contact between 2 and the shield case 1.

As explained above, the device according to the present invention has a structure in which the lead pins and the shield case do not come into contact with each other due to vibrations and shocks, which makes it possible to eliminate the side cap and provide the device at a low cost. You can get the same effect.

[Brief explanation of the drawing]

1 and 2 are a perspective view of a main part showing an example of a conventional magnetic bubble memory device, a sectional view taken along the line I-B, and FIGS. 3 and 4.
The figure is a sectional view of a main part of an example of a currently proposed magnetic bubble memory device, and FIGS. 5 and 6 are sectional views of main parts of an example of a magnetic bubble memory device according to the present invention. 1... Shield case, 2... Lead pin, 3... Magnetic bubble memory chip (chip), 5... Magnet block, 6...・Package, 8...Mold part.

Claims (1)

[Claims] 1. A shield case in which a package containing a magnetic valve memory chip is arranged between opposing sides, a molded part formed by filling resin between the shield cases, and one end connected to a terminal of the package and the other end or the In a magnetic valve memory device comprising at least a lead pin penetrating a mold part and bent in a direction intersecting one shield case, a lead-out end of the lead pin from the mold part and a lower end of a side surface of the mold part are connected to each other. A magnetic valve memory device characterized in that the end of the shield case is located inside of the connected straight line.