JPS6048066B2 - magnetic bubble memory device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic bubble memory device, and more particularly to the structure of an insulating substrate on which a magnetic bubble memory chip is mounted.

As a typical example of a bias magnetic circuit constituting a part of a magnetic bubble memory device, a double coil type (back-to-back type) magnetic circuit having a magnetic shielding function as shown in FIG. 1 has been proposed.

In the figure, 1a and lb are insulating substrates (hereinafter referred to as substrates) made of ceramic or the like, and in the center of these substrates 1a and 1b are magnetic bubble memory chips of the same standard (hereinafter referred to as chips). 2a and 2b are fixedly arranged. Further, on the surfaces of the substrates 1a, lb, a plurality of signal wiring patterns (not shown) for receiving and receiving the microhuman output signals of the chips 2a, 2b (7) are formed, and the edges of the substrates 1a, lb (7) are formed. Each terminal is connected to a terminal (not shown) provided in the section. Furthermore, an X-direction drive coil 3a in the X-axis direction and a Y-direction drive coil 3b in the Y-axis direction are wound on the outer peripheral surfaces of the substrates 1a and Ib, respectively, so as to be perpendicular to each other. It supplies a rotating magnetic field. In addition, the chips 2a, 2b are provided on the side surface side of the X-direction drive coil 3a) and the Y-direction drive coil 3b.
Permanent magnets 4 that provide a uniform bias magnetic field are arranged with their polarities aligned in the direction of the arrows with magnetic field shunt plates 5a, 5b, and 5c interposed therebetween. A shield plate 6 made of permalloy or the like, for example, is arranged on the outer surface of the permanent magnet 4 to shield it from external magnetic fields. In this case, since the reverse magnetic field of the permanent magnet 4 is applied to the chips 2a and 2b in the direction shown by the arrow, the surface of the chip 2a is mounted upward on the upper side of the device, and the chip 2 is mounted on the lower side of the device.
b Mounted with the surface facing downward. In the magnetic bubble memory device configured in this way, the information signal output from the chips 2a and 2b is several mV, whereas Since the pulse current and voltage supplied to the conductor are usually one to three orders of magnitude larger, the signal output system and drive system have been constructed separately as shown in the block diagram of FIG.

That is, in the figure, 7 is a direct peripheral circuit section of the magnetic bubble signal output system, 8 is a lead-out wiring from the chip 2a,
Reference numeral 9 indicates a lead-out wiring from the chip 25b, 10 indicates a bias magnetic circuit corresponding to that shown in FIG. 1, 11 indicates a drive circuit system for the lower substrate 1b, 12 indicates a drive circuit system for the upper substrate 1a, and 13 indicates a direct peripheral circuit of the drive system. Department. However, in the double coil type magnetic circuit with the above configuration, the chips 2a, 2
b Since the mounting boards 1a and 1b have different wiring patterns on the upper and lower sides, two types of boards 2a and 2b are designed and arranged for the upper and lower sides, respectively, and a well-balanced inventory of both is ensured. This is extremely uneconomical.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a magnetic bubble memory device in which a substrate can be secured extremely economically.

In order to achieve this object, the magnetic bubble memory device according to the present invention is such that a single substrate can serve as both the upper and lower stages. The magnetic bubble memory device according to the present invention will be described in detail below with reference to the drawings. FIGS. 3A and 3B are plan views of essential parts showing an embodiment of the magnetic bubble memory device according to the present invention, particularly an insulating substrate.

In these figures, 14 is an insulating substrate (hereinafter referred to as the substrate) made of, for example, ceramics, and figure a shows the front side 14a of this substrate 14, and figure b shows the front side 14a of this substrate 14.
This figure shows the back side 14b of 4. On the front side 14a and the back side 14b of this board 14, minute input/output signal wiring patterns 15a1 and terminals 15b, which are symmetrical with respect to the board 14 surface and have exactly the same shape and dimensions, are provided.
and drive input/output signal wiring pattern 5C1 its terminal 15
d are formed by adhesion, respectively. The substrate 14 configured in this manner has a front side 314a1 and a back side 14b.
Magnetic bubble memory chips (hereinafter referred to as chips) 16a to 16e are connected to the corresponding wiring pattern groups 15a and 15c via bonding wires 17, respectively, to the bias magnetic circuit shown in FIG. 36
A rotating magnetic field X and Y direction drive coil is wound and mounted.

In this case, the front side 14a of the substrate 14 shown in FIG.
The surfaces of the chips 16a to 16e are aligned on the same plane and mounted between the magnetic shunt plates 5a and 5b shown in FIG. 4 in an upward direction, and the substrate 14 shown in FIG. The chips 16a to 16e are arranged on the rear side 14b with the front surfaces of the chips 16a to 16e facing downward and mounted between the magnetic shunt plates 5b and 5c shown in FIG. 4. - According to such a configuration, the upper and lower substrates 14 are connected to the micro person output signal wiring terminal 15b and the drive input/output signal wiring terminal 15.
Since the signals b can be drawn out in the same direction and in opposite directions, it is possible to reliably prevent electrostatic coupling between the signal system and the drive system.

In addition, since the front and back surfaces of one board 14 can be shared between the upper and lower sides, inventory can be maintained in a well-balanced manner. As explained above, the magnetic bubble memory device according to the present invention can share the substrate by providing completely opposite wiring patterns on the front and back sides of the substrate.
Excellent effects such as being able to maintain a well-balanced inventory and being extremely economical can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts showing an example of a double-coil type magnetic circuit, FIG. 2 is a block diagram of the main parts of a magnetic bubble memory device, and FIGS. FIG. 4 is a plan view of essential parts showing an example of the side and back side thereof, and FIG. 4 is a perspective view of essential parts showing an example of the magnetic bubble memory device according to the present invention. 1a, 1b...Insulating substrate (substrate), 2a, 2b
...Magnetic bubble memory chip (chip), 3a...
...X direction drive coil, 3b...Y direction drive coil, 4...Permanent magnet, 5a, 5b, 5c
...Magnetic adjustment plate, 6...Wooled board, 7...
...direct peripheral circuit section of magnetic bubble signal output system, 8,
9... Lead wiring, 10... Bias magnetic circuit, 11, 12... Drive circuit system, 13...
...Direct peripheral circuit section of the drive system, 14...Insulating substrate (substrate), 14a...Front side, 14b...
...Back side, 15a...Minute input/output signal wiring pattern, 15b...Terminal, 15c...
- Drive input/output signal wiring pattern, 15d... terminal, 16a to 16e... magnetic bubble memory chip (chip), 17... bonding wire.

Claims (1)

[Claims] 1. A double coil magnetic bubble memory device comprising a magnetic bubble memory chip, an insulating substrate on which the chip is mounted, a magnetic circuit that supplies a bias magnetic field to the chip, and a coil block that applies a rotating magnetic field to the chip, A magnetic bubble memory device, wherein the insulating substrate has a wiring pattern with the front and back sides reversed.