JPS61242389A - Method for removing foreign matter of electromagnetic storage device - Google Patents

Abstract

PURPOSE:To improve the yield of an electromagnetic storage device by providing a magnet at the lower part of a plane of the storage device, applying a releasable resin on the plane to absorb and fix magnetic or other foreign matters stuck on an electromagnetic storage element or a substrate into the resin and then release the resin from the plane. CONSTITUTION:The silicon releasable resin 3, for example, is coated on a plane and a magnet 4 is set at the lower side of the plane. The most of the magnetic foreign matters 5 stuck on an electromagnetic storage element 1 and a ceramic substrate 2 are erected by a magnetic field H of the magnet 4. Then these matters 5 are buried into the resin 3 together with other types of foreign matters. The plane containing the resin 3 is left naturally or heated and therefore the resin 3 is cured. The cured resin 3 is released from the plane. Thus all foreign matters stuck on the plane are removed away together with the resin 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for removing foreign matter from an electromagnetic storage device used in a storage device or the like.

[Background of the invention]

For resin coating of electromagnetic storage devices, thick film I
P of the document titled "C conversion technology" (edited by Nippon Mashin Croelect, Ronix Association, published December 1, 1983),
278 K bubble memory device structure. However, this technique does not recognize the problem of foreign matter adhesion or removal.

[Purpose of the invention]

An object of the present invention is to provide an effective method for removing foreign substances from electromagnetic storage devices, and to improve the yield of 'wLm storage devices.

[Summary of the invention]

In the present invention, a releasable resin is placed on the lower part of the plane of an electromagnetic memory device, and a removable resin is applied on the plane, and magnetic foreign matter or other foreign matter adhering to the electromagnetic memory element or the substrate is absorbed and fixed in the resin. The resin is then peeled off from the plane to remove foreign matter.

[Embodiments of the invention]

Figure 1 is a perspective view of a plane used in an electromagnetic memory device, in which an electromagnetic memory element 1 made of an iron compound magnetic material is mounted on a ceramic substrate 21C made of alumina or the like. ,
1-2 shows a cross-sectional view of a hermetically sealed body in which the plane shown in FIG. 1 is hermetically sealed with a ceramic cap 3 made of alumina or the like.

However, there are various types of dust that cannot be seen with the naked eye on the electromagnetic temperature element 1 shown in Figure 1'1, on the ceramic substrate 2, and on the ceramic cap 3 shown in Figure 2.

The presence of foreign matter such as dirt, and the presence of special Km foreign matter, causes performance deterioration of electromagnetic storage devices, so methods for removing foreign matter have been a problem.

Figure 3 is a diagram showing the foreign matter removal method according to the present invention.
For example, a crecon-based release resin is applied onto the plane shown in the figure. What is important here is to arrange the magnet 4 below the plane. Figure 4 is a diagram for explaining Figure 3 in detail, in which the magnetic field H of the magnet 4 is applied to the electromagnetic memory element 1.

Most of the magnetic foreign matter 5 on the ceramic substrate 2 stands upright. (If the releasable resin 3 is applied on the plane, the magnetic foreign matter will be sufficiently buried in the resin. Of course, other foreign matters will also be sufficiently absorbed into the resin. In the plain case, the resin 3 is cured by being left to stand naturally or by heat treatment.

Figure 5 shows the hardened removable resin 3 on the plane being peeled off, and all foreign matter on the plane is removed together with the resin 6. Figure 6 shows an example in which a piece of cloth made of synthetic fiber or the like is used for the purpose of reinforcing the removable resin 3 when the resin 3 is applied.

〔Effect of the invention〕

According to the present invention, it is possible to almost completely remove foreign matter adhering to a plane, and the work of removing foreign matter can be performed extremely easily. Therefore, 1) it is possible to significantly improve the yield of electromagnetic storage devices, and 2) it is possible to greatly reduce the number of steps required for removing foreign matter, and the effects are extremely large.

[Brief explanation of drawings]

Figure 1 is a perspective view of a plane on which an electromagnetic memory element is mounted, Figure 2 is a sectional view of an airtight upper body for an electromagnetic storage device that seals the plane of Figure 1, and Figure 3 is a method for removing foreign matter according to the present invention. Figure 1. ? Figure 4 is a detailed explanatory diagram of Figure 3, Figure 5 is Figure 2.
FIG. 6 is a diagram illustrating peeling and removal of the releasable resin according to the present invention. DESCRIPTION OF SYMBOLS 1... Electromagnetic memory element, 2... Ceramic substrate, 3... Ceramic cap, 4... Magnet, 5... Maternal foreign object, 6... Synthetic fiber cloth piece.

Claims (1)

[Claims] A magnet is placed at the bottom of a plane made by mounting an electromagnetic memory element on a substrate such as a ceramic, and the plane is coated with removable resin to peel off magnetic foreign matter or other foreign matter that has adhered to the electromagnetic memory element or the substrate. Absorbed and fixed in a synthetic resin,
A method for removing foreign matter from an electromagnetic storage device, characterized in that the resin is then peeled off from the plane and foreign matter on the plane is removed.