JPS6141073B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic bubble storage device, and more particularly to its structure.

As shown in FIG. 1, a conventional magnetic bubble memory device has one or more magnetic bubble elements 1 mounted on a printed wiring board 2 such as a thick film printed ceramic substrate, and the magnetic bubble elements 1 and a crystal film in-plane. An inner coil 3 for applying a rotating magnetic field substantially parallel to the inner coil 3 and an outer coil 4 disposed orthogonally to the inner coil 3 are arranged so as to enclose the substrate 2. Permanent magnets 6a and 6b are arranged near the outer side of the magnetic bubble element 1 to apply a bias magnetic field substantially perpendicular to the crystal film surface of the magnetic bubble element 1. A yoke 5 fixed to each of the permanent magnets 6a and 6b is attached to the surface facing the magnetic bubble element 1, respectively.
a and 5b are arranged. Further, a magnetic shield frame 8 for preventing an external magnetic field from being applied to the magnetic bubble element 1 etc. is arranged around the outer periphery of the permanent magnets 6a, 6b. Conventionally, permanent magnets 6a and 6b are fixed to this magnetic shielding frame 8, and the permanent magnets 6a and 6b are often used to hold the magnets. Further, this shield frame 8 is made of a soft magnetic material having high magnetic permeability such as permalloy. In addition, a good heat conductive resin 7 is filled inside to conduct and dissipate the heat generated by the inner and outer coils to the outside.

Generally, in a magnetic bubble storage device, a rotating magnetic field, a bias magnetic field, and an in-plane bias magnetic field (bias magnetic field approximately parallel to the plane of the magnetic bubble element) must be applied accurately to the magnetic bubble element using a coil and a magnetic circuit. Therefore, the positional accuracy, especially the in-plane bias magnetic field, is determined by the permanent magnet 6.
The angles formed by the magnetic bubble element 1 and the yokes 5a and 5b must be set strictly.
However, in the magnetic bubble storage device configured as described above, (1) the magnetic circuit (permanent magnets 6a, 6b, yokes 5a, 5b) for applying a bias magnetic field perpendicularly to the magnetic bubble element 1 is connected to the outer coil 4; (2) It is difficult to maintain the relative positional accuracy between the magnetic circuit and the magnetic bubble element when placed outside the
There were drawbacks such as difficulty in replacing the magnet after filling.

The present invention eliminates the above-mentioned drawbacks, and makes it possible to easily and accurately arrange a magnetic bubble element in a magnetic circuit and also in an orthogonally arranged excitation coil. It provides a good magnetic bubble storage device.

The magnetic bubble storage device of the present invention has an outer shape of a rectangular parallelepiped or a shape close to a rectangular parallelepiped and has approximately the same dimensions, and
A set of holding members each having a recess on the top and bottom surfaces of two insulators forming a set below, and a holding member provided in a cavity formed when the set of holding members are overlapped with the main surfaces having the recess. a printed wiring board mounted with a magnetic bubble element, a set of coils provided in the cavity to provide a rotating magnetic field to the bubble element, and a set of coils provided in recesses on the upper and lower surfaces of the holding member to generate a bias magnetic field. The magnet includes an upper and a lower set of permanent magnets and a yoke.

Next, the present invention will be explained by examples using the drawings.

FIG. 2 is a perspective view of an example of a holding member used in the present invention.

The holding member 9 consists of a pair of upper and lower holding members 9a and 9b made of an insulator. This holding member 9
Concave portions 10a and 10b are formed on the inside so that a printed wiring board 2 on which a magnetic bubble element 1 is mounted, an inner coil 3, and an outer coil 4 can be received.
Recesses 11 for receiving the yokes 5a, 5b and permanent magnets 6a, 6b are provided on the upper surface of the holding member 9a and the lower surface of the holding member 9b.

FIG. 3 is a cross section of one embodiment of the present invention.

A printed wiring board 2 equipped with a magnetic bubble element 1 is placed inside an inner coil 3, and then the printed wiring board 2 is inserted into an outer coil 4.
The items placed in the holder are placed into the recesses 10a and 10b of the holding member 9 shown in FIG. Then, the inside of the holding member 9 is filled with resin 7 having good thermal conductivity. A yoke 5a5b and permanent magnets 6a, 6b are fixed to the recesses 11 on the upper and lower surfaces of the holding member 9, respectively.
By housing the entire structure within the magnetic shield frame 8, the magnetic bubble storage device of the present invention can be obtained.

With this configuration, the printed wiring board 2 on which the magnetic bubble element 1 is mounted, the inner coil 3, and the outer coil 4 are maintained with high positional accuracy within the holding member 9,
There is no leakage during resin filling, and settings can be made simply by inserting into the magnetic shield frame 8, and even if the permanent magnet is defective, it can be easily replaced.

As explained in detail above, according to the present invention,
The magnetic bubble element and the orthogonally arranged magnetic coil can be arranged in a magnetic circuit with high positional accuracy, resulting in a magnetic bubble storage device with high operational reliability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of a conventional magnetic bubble storage device, FIG. 2 is a perspective view of an example of a holding member used in the present invention, and FIG. 3 is a sectional view of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Magnetic bubble memory element, 2...Printed wiring board, 3...Inner coil, 4...Outer coil, 5
a, 5b...Yoke, 6a, 6b...Permanent magnet,
7... Resin, 8... Magnetic shield frame, 9, 9a,
9b...Holding member.

Claims (1)

[Claims] 1. A set of holding members having a rectangular parallelepiped shape or a shape close to a rectangular parallelepiped and having almost the same dimensions, and having recesses on the upper and lower surfaces of each of two insulators forming a set of upper and lower parts, and the above-mentioned set. a printed wiring board provided in a cavity formed when the holding members are overlapped with their main surfaces having recesses and mounting a magnetic bubble element; and a set provided in the cavity and applying a rotating magnetic field to the bubble element. A magnetic bubble storage device comprising: a coil; a set of upper and lower permanent magnets and a yoke, which are provided in the recesses on the upper and lower surfaces of the holding member to generate a bias magnetic field;