JPH0232713B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic bubble memory device in which a bubble memory module is detachably attached to a main body, and is particularly suitable for making the bubble memory module thin and compact. The present invention relates to a magnetic bubble memory device.

[Background of the invention]

Magnetic bubble memory is a well-known type of memory device. This is because when a plate-shaped crystal (hereinafter referred to as a bubble memory chip) made of an appropriate material is selected and a bias magnetic field of appropriate strength is applied, magnetic bubbles stably exist at any position, so this property can be utilized. It can be used as memory by generating magnetic bubbles, transferring them to a certain location, and detecting them.

This magnetic bubble memory is equipped with a rotating magnetic field generation circuit to transfer magnetic bubbles,
A coil is used as one component of the rotating magnetic field generating circuit. As is well known, this rotating magnetic field is created by arranging multiple coils, for example two coils, so that the magnetic fields they produce are perpendicular to each other, and each coil receives current with a phase difference of π/2. Obtained by flowing.

FIG. 1 shows a bubble memory module 1 in which the above-described bubble memory chip, bias magnetic field generating means, and rotating magnetic field generating coil are packaged;
A perspective view of a circuit board 3 on which this bubble memory module 1 is mounted is shown. In FIG. 1, 11 indicated by a broken line in the bubble memory module 1 is a bubble memory chip, and 2 is a peripheral circuit element for driving and controlling the bubble memory module 1.

Further, the internal structure of the bubble memory module 1 in FIG. 1 is shown in FIG. 2. FIG. 2 is a sectional view taken along the line A-A in FIG. 1, showing the bubble memory chip 11.
are die-bonded to a wiring board 12 made of a glass epoxy board, and drive coils 13 and 14 that generate a rotating magnetic field for transferring magnetic bubbles in the bubble memory chip 11 are arranged orthogonally around the wiring board 12. It has been incorporated. Above and below the drive coils 13 and 14, magnetic shunt plates 15a and 15b, magnet plates 16a and 16b, and a seed case 18 are arranged to hold the magnetic bubbles in the bubble memory chip 1. Drive coils 13, 14, magnetic shunt plates 15a, 15b, and magnet plate 1
6a and 16b and to ensure moisture resistance of the bubble memory module 1, resin molding 17 is performed. Furthermore, a shield case 18 is provided around the outer periphery of the resin mold 17 in order to shield from disturbance magnetic fields.

Now, in a magnetic bubble memory device having such a structure, a bubble memory cassette system in which a bubble memory module is formed into a cassette has been proposed, as seen, for example, in Japanese Patent Laid-Open No. 57-8981.

However, the cassette disclosed in Japanese Patent Application Laid-Open No. 57-8981 uses the modular system shown in FIG.
3, 14, and bias magnetic field generating means (15a, 15b, 16a, 16
b, 18), the following problems remain.

(1) The thickness t of the drive coils 13 and 14 significantly increases the height H of the bubble memory module 1,
The size of the cassette was increased.

(2) To reduce the amount of heat generated by the coil in order to ease the temperature conditions of the bubble memory chip 11, the thickness t of the coils 13 and 14 is increased by reducing the coil direct current resistance.

(3) Since the drive coils 13 and 14 are provided inside the bubble memory module 1, material costs and processing costs for the coils are required, which increases the cost of the module itself.

Therefore, in order to further popularize bubble memory cassettes, it is necessary to downsize the bubble memory module.
Weight reduction and cost reduction are strongly desired.

[Purpose of the invention]

An object of the present invention was to provide a magnetic bubble memory device that is thinner, smaller, and lighter, and that also alleviates temperature conditions and reduces costs. There is a particular thing.

[Summary of the invention]

The present invention has a structure in which the cassette side has means for generating a bias magnetic field for holding the magnetic bubbles in the bubble memory chip, but does not have a coil for generating a rotating magnetic field for transferring the magnetic bubbles; A rotating magnetic field generating means is provided on the main body side of the magnetic bubble memory device, and by attaching and detaching the cassette to the main body, stored information is retained by the bias magnetic field generating means when removed, and information is read and written by the rotating magnetic field generating means when attached. It is characterized by being designed to do the following.

[Embodiments of the invention]

Three embodiments of the present invention will be described in detail below with reference to the drawings.

(First Embodiment) Fig. 3 is a perspective view of a bubble memory module (hereinafter referred to as a cassette) used in the first embodiment of the present invention, and Fig. 4 shows the bias magnetic circuit shown in Fig. 3 taken out. 5 is a sectional view taken along line A-A in FIG. 3, and FIG. 6 is a sectional view taken along line B-- in FIG.
7 is an enlarged sectional view of the external connection terminal portion of the cassette shown in FIG. 5, FIG. 8 is a bottom view of the cassette shown in FIG. FIG. 8 is a perspective view of the main part of the main body of the magnetic bubble memory device that receives the cassette shown in FIG. 8, and FIG. 10 is a sectional view of the main part of the main body shown in FIG. 9 with the cassette attached.

In FIG. 4, a magnetic shunt plate 23 and a magnet plate 24 are arranged above and below a bubble memory chip 21, and a magnetic shielding case 25 consisting of a plate 25a and a column 25b is further arranged above and below them. The magnetic shield case 25 constitutes a closed magnetic path for the magnetic flux φ shown by a broken line 29, and provides a bias magnetic circuit. As is clear from FIG. 4, in the magnetic shielding case 25, the upper and lower plates 25a are connected at the four corners by pillars 25b, and the four side surfaces are not surrounded by the shielding means.

Referring to FIG. 5, the bubble memory chip 21
are mounted on the wiring board 22 and electrically connected, and the input/output terminals of the bubble memory chip 21 are as follows.
It is routed to the bottom surface of the cassette via the wiring board 22 and flexible printed circuit 60. That is, in FIG. 5, the flexible printed circuit 60 connected to the left and right sides of the wiring board 22 is disposed on the lower surface side of the cassette along the conductor shield case 27, and each conductor layer of the flexible printed circuit 60 is connected to the outside. A connection terminal 26 is electrically connected.

An enlarged cross-sectional view of the area around this external connection terminal 26 is shown in the seventh figure.
As shown in the figure. In FIG. 7, the flexible printed circuit 60 has a three-layer structure, with a central conductor layer 60b surrounded by upper and lower insulating layers 60a and 60c. Predetermined locations of the lower insulating layer 60c are perforated, and a metal layer such as solder is electrically connected to the exposed conductor layer 60b, and this metal layer constitutes the external connection terminal 26. FIG. 8 is a bottom view of the cassette, in which the external connection terminals 26 are formed flat on the entire bottom surface.

Note that the conductor shield case 27 is protected against rotating magnetic fields Hx and Hy (see Fig. 3) applied from outside the cassette.
A magnetic shielding case 25 is enclosed in order to prevent the magnetic field from being affected by the bias magnetic circuit. The conductor shield cases 27 are disposed above and below so that their central portions are parallel to the wiring board 22, and by making the conductor shield cases 27 parallel to the surface of the bubble memory chip 21, the uniformity of the rotating magnetic field is improved. FIG. 6 is a cross section of the end where the bubble memory chip 21 is not present, and the magnetic shielding case 25 including the support column 25b is surrounded by the conductive shielding case 27. The space at the end of the substrate 22 and the conductor shield case 27 is formed by the mold part 2.
8. As is clear from this,
The magnet plate 24 as a bias magnetic field generating means includes a magnetic shield case 25 and a conductor shield case 27.
surrounded by. However, the sides of the bubble memory chip 21 are not surrounded by shields, and are configured so that the rotating magnetic fields Hx and Hy applied from the sides can pass through.

As shown in the bottom view of the cassette in FIG. 8, a rectangular through hole 28b is provided around the mold portion 28, and a portion of the conductor shield case 27 is exposed. This is to connect with the conductor shield case 33 on the main body side, as will be described later. Furthermore, a broken line 60 in the center of the figure shows an example of wiring of the flexible printed circuit 60 shown in FIG. 5, in which four flexible printed circuits each having 15 external connection terminals 26 The wire is sewn through the gap between the holes 28b.

With this configuration, the magnetic bubble memory cassette as a storage medium can be configured without rotating magnetic field generating means.

Now, of the cassettes shown in Figures 3 to 8,
The installation and removal of the magnetic bubble memory device into the main body will be explained below.

FIG. 9 is a perspective view of the main body with the conductor shield case 34 opened. The conductor shield case 34 is rotatably supported on the main body, and is usually supported by spring means (not shown) or the like. , is biased in the opening direction. A cassette holder 61 is fixed to the conductor shield case 34, and
A lock piece 62 having a lock portion 62a at its tip is implanted. FIG. 10 is a sectional view of a main part of the cassette holder 61 shown in FIG. 9 with the cassette mounted and the conductor shield case 34 closed.

The rotating magnetic field generating section on the main body side is disclosed in, for example, U.S. Patent No.
As seen in the specification of No. 4165535, a pair of coils 32x and 32y are wound around a frame-shaped core (hereinafter referred to as a rectangular parallelepiped core) 31 in the X and Y directions to generate a rotating magnetic field. A conductor shield case 33 is provided to cover these rotating magnetic field generating parts. A plurality of holes 33a are provided in the center of the conductor shield case 33, and as shown in FIG. It protrudes inside. This connecting member 64
is composed of a conductive rubber or metal spring pin, etc., and preferably has elastic action in the vertical direction as shown in FIG. 10 for good electrical connection.

To attach the cassette to the main body shown in FIG. 9, first insert the cassette into the cassette holder 61 of the conductor shield case 34. In this case, the cassette is inserted so that the external connection terminal 26 faces downward, and the insertion direction of the cassette is indicated by an arrow as shown in FIG. After that, conductor shield case 34
When the cassette is closed, the locking portion 62a of the locking piece 62 engages with the locking member 65 inside the main body, and the mounting of the cassette is completed. By mounting the cassette, the plurality of external connection terminals 26 on the lower surface of the cassette are electrically connected to the plurality of connection members 64 on the main body, respectively. Also, the protrusion 3 on the bottom surface of the conductor shield case 33
3b is connected to the conductor shield case 27 of the cassette through the through hole 38b, and the lower surface periphery of the conductor shield case 34 is connected to the upper surface periphery of the conductor shield case 33 of the main body. The chip 21 and the rotating magnetic field generating means are arranged in one space formed by both shield cases. Thereby, the magnetic bubble memory device becomes operational.

To remove the cassette after the operation is complete, press the eject button (not shown) on the main unit.
The lock member 65 shown in FIG. 10 moves to the left in the figure and is disengaged from the lock piece 62. As a result, the conductor shield case 34 is opened as shown in FIG. 9 by the urging force of the spring means (not shown), and the cassette can be taken out. Furthermore, the 8th
The recess 28a shown at the top of the cassette in the figure is a part on which a finger is placed for taking out the cassette, and is molded integrally with the mold part 28. Although the cassette is not shown in FIG. 9, the dimensional relationship between the cassette and the cassette holder 61 is, for example, as shown in FIG.
It is not inserted within 1.

As described above, according to the first embodiment of the present invention, a cassette without a rotating magnetic field generating section can be obtained, and the cassette can be made smaller and thinner. By incorporating such a cassette into a rotating magnetic field generating section, a readable and writable magnetic bubble memory device can be obtained.

In this first embodiment, the external connection terminals 26 can be provided over almost the entire lower surface of the cassette, which is very advantageous in making the cassette multi-terminal.

(Second Embodiment) Now, in the first embodiment described above, the rectangular parallelepiped core 31, the coil 32x,
An example using 32y is shown. however,
From the technical idea of the present invention, the shape of the rotating magnetic field generating section does not matter. An example in which a rectangular solenoid is used as the rotating magnetic field generating section will be described below.

For example, the rectangular solenoid (coil) is
In the second embodiment of the present invention, which is disclosed in Japanese Patent No. 22874, a cassette equipped with a bubble memory chip and bias magnetic field generating means is inserted into and taken out from the coil.

11 and 12 are perspective views of a main body and a cassette according to a second embodiment of the invention. The main body 70 includes a cassette insertion portion 72 and the coil 7.
A rotating magnetic field generating section 71 including 3x and 73y is provided. A cross-sectional view of the cassette of this embodiment is shown in FIG.
It is similar to the cassette of the embodiment, and the same elements are given the same numbers to avoid redundant explanation. The three points in particular that are different are the flexible printed circuit 6
The external connection terminal 26 is provided on the side surface of the wiring board 22, that is, the side surface of the cassette, and the three insertion guide grooves 27 are provided on the conductor shield case 27.
The point is that a, 27b, and 27c are provided.

Now, let's talk about how to attach and detach this cassette.
This will be explained using FIGS. 16 to 16. As shown in FIGS. 15 and 11, the front sides of the coils 73x and 73y are provided with a wide space to serve as a passage for the cassette. And this coil 73x, 73y
A cassette moving member 74 extends through. The front side front view of this moving member 74 is shown in the 16th figure.
FIG. 18 shows a cross-sectional view of the center plane of FIG. 16. At least the front surface of the moving member 74 is made of a material that does not adversely affect the magnetic field, and its shape is as shown in FIG. It has a box shape consisting of an upper part 74d. and the upper part 74d and the lower part 74
b serves to position the inserted cassette, and the left portion 74a and right portion 74c constitute a connector portion to be connected to the external connection terminal 26 of the cassette.

To install the cassette, first insert the cassette into the cassette insertion section 72 shown in FIG. As a result, the three guide grooves 27a, 27b,
27c are elastic pins 75a of the lower part 74b,
75b and the elastic pin 75c of the upper part 74d, the cassette advances to the back. In the process of inserting the cassette, as shown in FIG.
The connectors 76 and 77 provided with the connector 77a are opened by the urging force of the springs 76b and 77b, respectively, and allow insertion of the cassette. Now, when the cassette is inserted all the way, the frontmost part of the cassette presses the switch 78 provided on the moving member 74.
Turn this on. By turning on this switch 78, the plunger 7 installed on the moving member 74
9 (see FIG. 11) is activated. plunger 79
is the wire 76 stretched between the connectors 76 and 77
c and 77c to rotate the connector 76 counterclockwise about the shaft 76d,
The connector 77 is rotated clockwise about the shaft 77d. This state is shown in FIG. 15, and as the connectors 76 and 77 rotate, the terminal 76
a, 77a are external connection terminals 26 on the side of the cassette.
electrically connected to. In addition, in Fig. 14,
76e and 77e are stoppers for suppressing the rotation of the connectors 76 and 77, and the left part 74a and the right part 74
It is integrally molded into c. Also, 76f, 77
f is a pulley for wires 76c and 77c. Furthermore, 76g and 77g are terminals 76a and 77
This is a flexible printed circuit for connecting a to an external circuit.

When the electrical connection between the cassette and the connector is completed as described above, the drive device 80, which is constituted by a plunger, for example, is activated in FIG.
The moving member 74 is moved to the right in FIG. 15. The command to operate the drive device may be externally operated by the user, or may be issued automatically after detecting the operation of the plunger 79. Due to the movement of this moving member 74.
Although not shown, the cassette has coils 73x, 7
3y, and the bubble memory device becomes operational. That is, the bubble memory chip 21
A rotating magnetic field is applied to the , allowing information to be written or read.

Next, we will explain how to take out the cassette after writing and reading information is completed. This can be done by releasing the drive device 80 using an operation button (not shown). This release causes the moving member 74 to return to the position shown in FIG. 15. Also, connector 7
6, 77 as shown in FIG. 14, it is necessary to mechanically detect that the movable member 74 has returned to the position shown in FIG. 15 (the detection means is not particularly shown), and then turn off the plunger 79. Bye. As a result, the connectors 76 and 77 are connected to the springs 76b and 77b.
It opens due to the tensile force of. This allows the cassette to be taken out by hand. In addition, the moving member 7
If the detection means is arranged so as to turn off the plunger 79 in the process of returning to FIG. It becomes easier.

(Third Embodiment) Now, in the above first and second embodiments,
An example has been described in which the entire cassette including the bubble memory chip and the bias magnetic field generating means is installed into the rotating magnetic field generating means. In the following third embodiment, a bubble memory chip and a bias magnetic field generating means are provided on the cassette side, a rotating magnetic field generating means and a bias magnetic field generating means are provided on the main body side, and the bubble memory chip or the same is mounted on the cassette side. The printed wiring board is moved to the main body side. This will be explained with reference to FIGS. 17 to 22.

FIG. 17 is a perspective view of the main body 90, which includes a rotating magnetic field generating section 91 and a cassette insertion section 92. FIG. 18 is a sectional view taken along the line AA of the rotating magnetic field generating section 91 and the cassette inserting section 92 shown in FIG. 17, and the rotating magnetic field generating section 91 is composed of the following elements. Coils 93x and 93y are arranged orthogonally and are important elements of the rotating magnetic field generating section 91. This rotating magnetic field generating section 91 includes a magnet plate 9
4. A bias magnetic circuit consisting of a magnetic shunt plate 95 and a magnetic shield case 96 is provided.

On the other hand, as shown in FIG. 19, the cassette is provided with a bias magnetism generating means consisting of a magnetic shunt plate 23 and a magnet plate 24 as in the above-described example, and the entire cassette is covered with a magnetic shielding case 25. . The cassette of FIG. 19 is particularly different from the cassette of the previous embodiment in that the bubble memory chip 21
The wiring board 97 on which the wiring board 97 is mounted and the package mold part 98 in which the wiring board 97 is molded are integrated and can be removed from the cassette, and an external connection terminal 97 is provided at the right end of the wiring board 97.
This is the point where a is provided. FIG. 19 is a sectional view showing a state in which the cassette having the above structure is attached to the main body. At this time, the magnetic circuit structure is adjusted so that the bias magnetic fields 23a and 94a of both are equal.

At this time, the connector 100 at the tip of the moving member 99 provided on the main body 90 is electrically and mechanically connected to the external connection terminal 97a of the wiring board 97 of the cassette. When reading and writing to the memory, the drive device 8 shown in FIG. 17 is activated by an external operation.
Operate 0. As a result, the moving member 99 moves together with the wiring board 97 to the position shown in FIG. 20, and a rotating magnetic field is applied to the bubble memory chip 21. 21 and 22 show plan views of the main parts of FIGS. 19 and 20.

Incidentally, in order to take out the cassette from the state shown in FIG. 20, first the drive device 80 is released by an operation button (not shown). As a result, the moving member 99 returns to the position shown in FIG. 19, and the wiring board 97 is housed in the cassette. Thereafter, the cassette is removed from the cassette insertion section 92. Note that when taking out the cassette from the cassette insertion portion 92, it is necessary to overcome the mechanical coupling force between the external connection terminal 97a and the connector 100. For this purpose, it is effective to grasp the molded portion 98 from outside the cassette and pull out the cassette. Specifically, a portion 25a on the left side of FIG.
Usually, a pair of clamping buttons are provided which are protruded outward from the cassette by means of an elastic member, and a part of the magnet plate 94 and the magnetic shunt plate 95 between the clamping buttons are cut out so that the clamping buttons can be pressed when the cassette is pulled out. Mold part 98
In this method, the cassette is pulled out while directly pressing the cassette. Various other methods are possible, such as improving the connector 100, but since they are far from the core of the present invention, detailed explanations will be omitted.

〔Effect of the invention〕

As described in detail above, according to the present invention, since the rotating magnetic field generating section can be removed from the magnetic bubble memory cassette, the cassette can be made thinner and smaller, and at the same time, the cost can be reduced. Furthermore, since the memory function can be made to be on the same level as other storage media (magnetic disks, magnetic tapes), it can greatly contribute to the spread of magnetic bubble memory, and has extremely great industrial value.

[Brief explanation of drawings]

Figure 1 is a perspective view of a circuit board equipped with a conventional bubble meser module, and Figure 2 is A of Figure 1.
-A sectional view. FIG. 3 shows the first part of the device of the present invention.
FIG. 4 is a perspective view of the cassette used in the embodiment, FIG. 4 is a perspective view of the main part of FIG.
3 is a sectional view taken along line A-A, and FIG. 6 is a cross-sectional view taken along line B--
B sectional view, FIG. 7 is an enlarged sectional view of the main part of FIG. 5,
Fig. 8 is a bottom view of Fig. 5, Fig. 9 is a perspective view of main parts of the main body of the first embodiment of the device of the present invention before the cassette is attached, and Fig. 10 is a cassette attached to the main body of Fig. 9. FIG. 3 is a sectional view of a main part in a state where the device is installed. FIG. 11 is a perspective view of the main body before mounting a cassette in the second embodiment of the present invention, FIG. 12 is a perspective view of the cassette used in the second embodiment of the present invention, and FIG. The A-A sectional view in Fig. 12 and Fig. 14 are
1 is a plan view of the main part in FIG. 1, FIG. 15 is a plan view of the main part in FIG. 11, and FIG. 16 is a left side view of FIG. FIG. 17 is a perspective view of the main body before mounting the cassette in the third embodiment of the present invention, and FIG.
FIG. 17 is a cross-sectional view of the main parts, FIG. 19 is a cross-sectional view showing the cassette mounting process of the third embodiment of the present invention, and FIG. 20 is a cross-sectional view showing the cassette mounting state of the third embodiment. , FIG. 21 is a plan view of the main part of FIG. 19, and FIG. 22 is a plan view of the main part of FIG. 20. 21...Bubble memory chip, 22...Wiring board,
23,95...Magnetic shunt plate, 24,94...Magnet plate, 2
5, 96... Magnetic shield case, 26... External connection terminal, 27... Conductor shield case, 28... Mold part, 31... Rectangular parallelepiped core, 32x, 32y... Coil, 33, 34... Conductor shield case, 60... Flexible printed circuit, 61...Cassette holder, 7
0,90...main body, 71,90...rotating magnetic field generating section,
72, 92...Cassette insertion section, 73x, 73y,
93x, 93y... Coil, 74, 99... Moving member, 76, 77, 100... Connector.

Claims (1)

[Scope of Claims] 1. A rotating magnetic field generation means for transferring magnetic bubbles in a bubble memory chip, a bias magnetic field generation means for holding magnetic bubbles, and a bubble memory chip, and is detachable from the main device. 1. A magnetic bubble memory device comprising: a cassette, wherein the bias magnetic field generating means of the cassette is placed inside the rotating magnetic field generating means of the main unit to function. 2. The rotating magnetic field generating means is composed of a frame-shaped core and a pair of coils wound around the core to generate a rotating magnetic field, and is configured so that the cassette can be attached to and removed from a space in the center of the core. A magnetic bubble memory device according to claim 1, characterized in that: 3. The magnetic bubble memory device according to claim 2, wherein the cassette is configured to be inserted into and removed from the space by rotating means provided on the main body. 4. The magnetic bubble memory device according to claim 3, wherein the bias magnetic field generating means of the cassette is shielded with a conductor. 5. The magnetic bubble memory device according to claim 3, wherein the external connection terminal of the cassette is provided on the bottom surface of the cassette. 6. The rotating magnetic field generating means is composed of a pair of rectangular solenoids arranged perpendicularly to each other so as to generate a rotating magnetic field, and the cassette is configured to be attached to and removed from a space in the center of the solenoid. A magnetic bubble memory device according to claim 1. 7. The magnetic bubble memory device according to claim 5, wherein the cassette is guided into the space by a moving member provided on the main body. 8. The magnetic bubble memory device according to claim 6, wherein the moving member is provided with a cassette insertion section. 9. The magnetic bubble according to claim 7, wherein the external connection terminal of the cassette is provided on a side surface of the cassette, and the cassette insertion portion is provided with a connector to be connected to the external connection terminal. memory device. 10. The magnetic bubble memory device according to claim 8, wherein the connector is configured to detect insertion of the cassette and connect to the external connector. 11. A cassette comprising a bubble memory chip and a bias magnetic field generating means shielded with a conductor, proximate to the bubble memory chip, and for holding magnetic bubbles within the bubble memory chip.