JPH03257372A - Magnetic bubble element - Google Patents

Abstract

PURPOSE:To read bit information of a plurality of minor transfer element loops by providing the minor transfer element loops in a plurality, one stretcher, a magnetic bubble detector, magnetic bubble duplicating means, etc. CONSTITUTION:Patterns of magnetic bubbles 11, 12, 15... based on the principle of a memory wheel are written in a plurality of minor transfer element loops A, B, C..., and the number of bits on each loops is in the relationship of having no common measure with that on other. These loops A, B, C... are not provided with a stretcher 16 and a magnetic bubble detector. Each of duplicators 14A, 14B, 14C... is provided in a part of each of the loops A, B, C... and a magnetic bubble 15 transferred on each loop is duplicated. A major transfer element loop 22 transfers the bubble 15 duplicated by each of the duplicators 14A to 14C... to the stretcher 16. The stretcher 16 stretches the magnetic bubble to be slender, while the magnetic bubble detector 21 is provided in the vicinity of the stretcher 16 and detects the bubble 5 passing through the stretcher 16.

Description

[Detailed Description of the Invention] <Field of Application for Industry J2> The present invention relates to a magnetic bubble element used in a rotation speed detector, etc., which transfers magnetic bubbles in both directions, clockwise and counterclockwise. .

<Prior Art> The present applicant has already filed an application related to a magnetic bubble element in Japanese Patent Application No. 1982-212207 (referred to as Prior Example 1). This application describes a technique for detecting magnetic bubbles with a magnetic bubble detector, which includes a transfer element loop provided with a bit pattern of magnetic bubbles based on the "memory wheel principle" described later.

First, the operating principle of a rotation speed detector using a magnetic bubble element will be explained with reference to FIG. In FIG. 3, reference numeral 1 denotes a magnetic bubble element, which is composed of a mounted magnetized film and a thin film pattern formed thereon.

This magnetic bubble element 2 is provided with a transfer element loop as shown in FIGS. 4 and 5, which will be described later.

2 is a set of two bias magnets, and magnetic bubble element 1
It applies a constant perpendicular magnetic field (bias magnetic field) to the magnetic field, and has the effect of holding a bubble-shaped magnetic domain.

3.4 is an excitation coil, which is arranged around the magnetic bubble element 1 as shown in FIG. And this readout coil 3
．． 4 operates when reading the cumulative number of rotations of the rotating shaft, and by passing an alternating current through these two coils, a rotating magnetic field is generated to transfer the magnetic bubbles on the transfer element loop, which will be described later. be.

Reference numeral 5 denotes a permanent magnet formed in the shape of a link, which is attached to a rotating shaft (not shown). This link magnet 5 provides an in-plane magnetic field parallel to the magnetic bubble element 1. , this in-plane magnetic field rotates as the rotation axis rotates.The magnetic bubble is 1 bit shift/1 rotation magnetic field, and the fourth
It circulates on the transfer element loop as shown in the figure. Figure 1 shows an example of a link magnet magnetized to 8 poles; in this case,
When the rotating shaft rotates once, the magnetic bubble moves by 4 bits. The ``pit'' will be described later, but the second
Except for the transfer elements 19 at the corners in the figure, one transfer element 18 in the straight line corresponds to one bit.

A plurality of transfer element loops a, b, c, . . . are provided on the magnetic bubble element 1 as shown in FIG. Each transfer element loop a, b, c, . . . is, for example,
Thin film Per-Malloy transfer elements 18 and 19 having the shape shown in FIG. 4 are formed in a loop shape. The transfer element 18 is arranged in the straight part, and the transfer element 19 is arranged in the course part. Each transfer element loop is provided with a rectangular thin film pattern called a stretcher, as shown in FIG. Detection of magnetic bubbles is made easy.

Each such transfer element loop is provided with a plurality of magnetic bubbles 9a, 9b, . . . as shown in FIG.

The number of these magnetic bubbles that can exist on each transfer element route 1 is referred to as the "number of bits" in this specification.This number of pits is the number of transfer elements 18, 19 and the transfer elements of the stretcher section. Therefore, the size of the transfer element loop can be expressed as a number of pins.

These magnetic bubbles are arranged in an arrangement based on the "memory wheel principle" as explained in the first example. For example, in the transfer element loop a, a bit pattern of 01 bits (0100101...) is formed depending on the presence or absence of magnetic bubbles. Similarly, n2. n3゜・・・Pip I-
A pit pattern is formed.

Note that these bins 1 to number, nl, n2. n3.・・・
・ are chosen so that they do not have a divisor of J(tsu).

With this relationship, the magnetic bubble element has (nl・).
Only after the rotating magnetic field is applied n2, n3, . . . ) times does the mutual bit arrangement of each transfer element loop return to its original state. Therefore, there is an advantage that a large number of revolutions can be measured with a small number of bits. Regarding this, prior art 1 and Japanese Patent Application No. 61-221670 (
This is described in detail in Preceding Example 2).

In the rotation speed detector shown in FIG. 3, with the link magnet 5 stopped rotating, a new rotating magnetic field is applied from the readout coil 3.4 to the magnetic bubble element 1, and each transfer element loop a, b, c... The above magnetic bubble pattern is forcibly transferred and passed through the magnetic bubble detector 10, and the cumulative number of rotations of the rotating shaft is known by reading out several consecutive pips. There is.

In other words, conventionally, as shown in FIG. 5, a plurality of transfer element loops each having a number of bits that do not have a common divisor are provided on the magnetic bubble element 1, and each transfer element loop a, b, c
A stretcher 16 was provided for each of the stretchers 1 to 16, and several bits were read out by magnetic bubble detectors 10 provided in the stretchers 1 to 16.

Problems to be Solved> The conventional magnetic bubble elements as described above have the following problems.

(1) Since the magnetic bubble detector 16 is provided for each transfer element loop, a circuit for processing the bit signal read from each magnetic bubble detector is required. Therefore,
The construction cost and smoothness of the circuit portion increase.

(2) The magnetic bubble has magnetic fields 11x, Hy(
If the value shown in Figure 3 is not within the range of the bias magnetic field and force (called the operating margin), it will disappear or be duplicated on the transfer element loop.If this happens,
Since the memory wheel pattern is destroyed, it is no longer possible to read the number of rotations thereafter. The stretcher part is
Since this part has the function of transferring the magnetic bubble and stretching it into a long and thin length, the operating margin is tighter than that of other transfer element parts.

Therefore, when a plurality of stretchers are scattered in various places on the magnetic bubble element as shown in Fig. 5, the strength of the rotating magnetic field and the bias magnetic field must be made uniform over a wide range.
Achieving this will be difficult.

An object of the present invention is to provide a magnetic bubble element that solves the problems (1) and (2) above.

Means for Solving the Problems> In order to solve the above problems, the present invention provides a method in which a pattern of magnetic bubbles based on the principle of a memory wheel is written, and the number of magnetic bubbles that can exist on a loop is approximately equal to each other. A plurality of minor transfer element loops that have a non-numerical relationship, one stretcher that stretches magnetic bubbles into a long and thin shape, and a magnetic bubble detector that is installed near this stretcher and detects magnetic bubbles passing through the stretcher. Replication means c1 installed in a part of each minor transfer element loop for duplicating the magnetic bubble transferred on the minor transfer element loop, and a major transfer element loop for guiding the duplicated magnetic bubble to the stretcher. and a transfer element capable of bidirectional transfer, which is provided so as to surround the plurality of minor transfer element loops, the stretcher, the magnetic bubble detector, and the major transfer element loop, so that the magnetic bubble returns to the stretcher side. and a guardrail that receives magnetic bubbles that have passed through the stretcher through means that have a unique function.

In the present invention, magnetic bubbles of several bits are duplicated and taken out from a plurality of minor transfer element loops (there is no stretcher in this minor transfer element loop) to major transfer element loop 1, and this is used for magnetic bubble detection. It is read using a container and a stretcher. Therefore, the conventional problems can be solved. Note that if only one stretcher is used, when the rotation axis rotates in the opposite direction, there is a risk that the duplicated magnetic bubbles will go back through the major transfer element loop and enter the transfer element loop. If this happens, the bit pattern of the memory wheel will be destroyed. Therefore, in the present application, a means is provided to prevent the magnetic bubbles that have passed through the stretcher from returning, and a guardrail capable of bidirectional transfer is provided to prevent this from occurring. <Example> Hereinafter, the present invention will be described in detail using the drawings.

Figure 1 is a diagram showing an embodiment of the magnetic bubble element according to the present invention, Figure 2 is a diagram showing the shape of the transfer element of the guardrail of the element in Figure 1, and Figure 6 is a corner part of the guardrail in Figure 2. FIG. 2 is a diagram showing a transfer element of FIG.

The magnetic bubble element 1 shown in FIG. 1 is placed at the position of the magnetic bubble element 1 shown in FIG. 3.

In FIG. 1, A, B, C, ... are written with magnetic bubble patterns based on the above-mentioned memory wheel principle, and the number of magnetic bubbles that can exist on the loop, that is, the number of bits, is mutually different. This is a plurality of minor transfer elements that have no common divisor. Each minor transfer element loop A0 B, C, . . . is not provided with a stretcher and a magnetic bubble detector LH, unlike the example shown in FIG.

That is, the shape of each minor transfer element loop A, B, . . . is the same as, for example, the transfer element loop shown in FIG. Note that each minor transfer element loop can bidirectionally transfer the magnetic bubble on the minor transfer element loop.

14A, 14B, 14c, ... are replicators,
Each minor transfer element loop A, 13. It is provided in a part of C, . . . and has the function of replicating the magnetic bubble 15 transferred through the minor transfer element loop.

Such a duplicator is well known, and a description of its configuration will be omitted.

22 is a major transfer element loop, and each replicator 14
A, 14B, 14C, . . . , the magnetic bubbles 15 copied from the magnetic bubbles 15 are transferred to a slider lens 16 to be described later.

This major transfer element loop 22 is composed of transfer elements 18 and 19 as shown in FIG. 2, for example.

In addition, the major transfer element loop 22 is arranged so that the magnetic bubbles copied and transferred from each of the minor transfer element loops A, B, and C 1 do not collide and coalesce on the common major transfer element loop 22. The number of constituent transfer elements is designed in advance as follows.

As shown in FIG. 1, the intersection points of the transfer path from each duplicator (branch line of the major transfer element loop) and the major transfer element loop of the main line are designated as points 01, 02, and 03, as shown in FIG. For example, the duplicator 14A-→Q1 point and the duplicator 14B-02
If we assume that the number of transfer elements from point 01 to point Q2 is the same, then the number of bits (number of transfer elements) from point 01 to point Q2 and the number of bits (number of transfer elements) from point 02 to point Q3 are the same. The number of elements) is made larger than the number of bits to be read from each minor transfer element loop. For example, from the minor transfer element loop, 10
Assuming that the pit is copied and read out, the number of transfer elements from point 01 to point Q2 and from point 02 to point Q3 should be set to 10 or more.

1G is a stretcher that does not stretch the magnetic bubble into a long and thin shape, and this one stretcher is commonly used in the present invention.

2 21 is a magnetic bubble detector provided near the stretcher 16 to detect the magnetic bubbles 15 passing through the stretcher. The output of the magnetic bubble detector 21 is applied to an amplifier (not shown), and based on this signal, a rotation speed detector determines whether or not a magnetic bubble has passed.

17 is a transfer game I~, and a stretcher 16
The magnetic bubble 15 that has passed through is introduced through the major transfer element loop 23, and this magnetic bubble is discharged to the card rail 13 which is followed by 1 mm. This transfer gate 17 has a function (that is, a one-way transfer function) that prevents magnetic bubbles on the card rail 13 from entering the major transfer element loop 2311'llJ. A known transfer device 17 can be used for the transfer game 1, so a detailed explanation thereof will be omitted.

13 is a card rail. Card rail 1 of the present invention
3 is a transfer element 1 capable of bidirectional transfer as shown in FIG.
8.19 consists of minor transfer element loops A, B,
C, . . . are provided so as to surround the stretcher 16, the magnetic bubble detector 21, and the major transfer element loop 22. In the present invention, the guardrail 1
One of the features is that it uses a guardrail 13 that has the function of bidirectionally transferring the magnetic bubbles on the top 3. To explain, this guardrail 13 is a magnetic bubble 15 that is copied from each minor transfer element loop A, B, . . . and read by the magnetic bubble detector 21 (after reading, it is an unnecessary magnetic bubble). However, once again, there is a function to prevent people from entering the minor transfer element loops A, B, etc., and an unnecessary magnetic bubble 11 generated at the edge of the magnetic bubble element 1.
However, it has a function to prevent crowding into the minor transfer element loops A, B, . These two functions are
What can be achieved by configuring the card rail 13 with one transfer element 18° capable of bidirectional transfer is described in detail in Utility Model Application No. 01-084387 filed by the present applicant.

As a result, even if the ring magnet 5 repeats forward rotation and f4 rotation, the magnetic bubbles 11 and 12 once captured on the guardrail 13 only move back and forth on the guardrail 13, resulting in minor transfer. Element loop A.

11. ...It will not get mixed up in the measurement. However, if the conventionally shaped card rail described in Utility Model No. 01-084387 is used, when the ring magnet 5 rotates in the opposite direction, the unnecessary magnetic bubbles (for example, the magnetic bubbles 11) will be transferred to the minor transfer element loop A. It gets mixed into the B, C,... side and the memory wheel pattern is destroyed.

The operation of the magnetic bubble element shown in FIG. 1 will be explained below.

explain. When the ring magnet 5 rotates with the rotation of the rotating shaft, an in-plane rotating magnetic field is applied to the magnetic bubble element 1, so that each minor transfer element loop A, B, C, . . . in FIG.
- Each magnetic bubble 15 written above moves on each loop with one bit shift/one rotation of the magnetic field.

In this way each minor transfer element loop A.

The magnetic bubble pattern on B, . . . has been transferred and has come to a position corresponding to the cumulative rotation number of the ring magnet 5.

Then, the measurement of this cumulative rotation number is carried out by applying a predetermined number of bits from each minor transfer element loop to the replicators 14A and 14.
8. Operate 14C, . . . , take out the magnetic bubble into the major transfer element loop, expand it into a long and thin strip with the common stretcher 16, and detect its presence with the magnetic bubble detector 21. ing.

The read operation of the magnetic bubble will be explained below. It has already been mentioned that the cumulative number of rotations of the rotating shaft can be determined by reading the pattern of several bits on each minor transfer element loop A, Il, . . . according to the memory wheel principle. Conventionally, a stretcher and a magnetic bubble detector were provided for each transfer element loop, and these were used to read several bits, but the present invention provides a stretcher and a magnetic bubble detector for each minor transfer element loop. No equipment is provided. Therefore, magnetic bubbles are detected using a magnetic bubble detector 21 and one stretcher 16 provided outside each minor transfer element loop.

When the rotation of the ring magnet 5 stops, the reading coil 3.4 is turned on to measure the cumulative number of rotations of the ring magnet 5.
An alternating current is applied to the circuit from a circuit not shown. Therefore,
Each minor transfer element loop A by means of a rotating magnetic field from the readout coil 3.4.

6 The magnetic bubbles above B, . . . are forcibly transferred.

In the case of transfer using the readout coil 3.4, the duplicators 14^, 148.14C, . . . perform a duplication operation in synchronization with the rotating magnetic field of the readout coil.

The duplication operation is performed by applying a current (not shown) to the duplicator. Therefore, the number of current pulses applied to the replicator 14^, 148.14C is the number of bits required for the reading described above. That is, a rotating magnetic field is applied to the duplicator 14A.
, 14B, 14C, ..., a current is applied to the replicators 14^, 14B, 14C6.As a result, if there is a magnetic bubble passing through this part of the replicator, This is duplicated and a new magnetic bubble is generated in the major transfer element loop 22.

In this way each minor transfer element loop A.

When a predetermined number of bits of magnetic bubbles are copied from B, C, .
No current is applied to 4A, 14B, 14C, and from then on, even if a rotating magnetic field is generated from readout coil 3.4, the predetermined number of bits will no longer be duplicated.

Note that 7 on the major transfer element loop 22 The duplicated bit information is arranged in the order in which it was read.

Then, when a rotating magnetic field is applied to the readout coil 3.4 even after duplication, each of the duplicated magnetic bubbles is
, D2. Transferred route D3,04, stretcher 1
Leads to 6.

Note that since it is possible to know in advance how many transfer elements (this is the transfer element constituting the major transfer element loop 22) to reach the magnetic bubble detector 21 from each replicator 14A, 14B, 14C, The magnetic bubble detector 21 can recognize which bit of which minor transfer element loop the currently detected bit is.

Then, when a rotating magnetic field is continuously applied from the readout coils 3 and 4, each minor transfer element loop A.

Magnetic bubbles of a predetermined number of bits (including blank bits) copied from B and C pass through the stretcher 16 and the magnetic bubble detector 21 one after another, and then pass through the transfer gate 17 to the guardrail 13. be discharged.

In this way, when all the duplicate magnetic bubbles existing on the major transfer element loops 22 and 23 are discharged onto the guardrail 13, the readout coils 3 and 4 receive a rotating magnetic field in the opposite direction. to each minor transfer element loop A.

The magnetic bubble patterns in B and C are transferred in the opposite direction and returned to the position before reading.

At this time, even if a rotating magnetic field in the opposite direction is applied to the magnetic bubble element 1 (or even if the rotation axis rotates in the opposite direction after reading), there is no longer a magnetic bubble within the major transfer element loop 22,23. , minor transfer element loops A, B, C
There are no magnetic bubbles flowing back inside. Further, due to the action of the transfer gate 17, the magnetic bubbles 11.12 discharged onto the guardrail 13 do not flow backward and enter the major transfer element loop 2322→minor transfer element loop.

Regarding the card rail 13, please refer to the actual application number 01084.
Since it is described in detail in No. 387, I will briefly explain it here. The magnetic bubble element 1 is manufactured by fabricating a pattern of each transfer element as shown in FIG. A
,B,C, write magnetic bubbles with a predetermined memory wheel bit pattern.

However, even in the magnetic bubble element 1 configured as described above,
Unnecessary magnetic bubble 1 after reading the bit information mentioned above
Unnecessary magnetic bubbles 11 are naturally generated from the edges of the magnetic bubble element 1 due to stress and distortion during dicing (cutting a wafer into chips as shown in FIG. 1). These unnecessary magnetic bubbles 11 and 12 are captured onto the guardrail 13, but the guardrail 1 of the present invention
3 is of a type that transfers magnetic bubbles bidirectionally on the card rail, so the magnetic bubbles 11 and 12 once captured on the guard rail 13 cannot escape from the guard rail 13.

The reason why magnetic bubbles can be transferred in both directions by using a transfer element as shown in FIG. 2 will be explained with reference to FIG. 6. FIG. 6 is a diagram illustrating the shape of the corner transfer element 19. As shown in FIG. 6(A), by combining two half-disk patterns 18 (18a, 18b) for straight portions shown in FIG.
A corner pattern 19 is synthesized. That is, the half-disc patterns 18a and 18b are arranged at an angle of 90 degrees to each other, and one arm P2 of the two parallel arms PI and P2 of the half-disc pattern 18a is connected to the half-disc pattern 18b. , and two parallel arms P3. of the half-disk pattern 18b.
Half disk pattern 1 on one arm P3 of P4
The staggered pattern superimposed on a part of 8a can be used as a corner pattern. Figure 6 (B) shows the sixth
The width of the body part P5 of the corner pattern 19 in Figure FA) is widened, and the overall dimensions are expanded to have a body part with a wide width W, and the movement of the magnetic bubble is made smoother.

Effects of the Present Invention> As described above, according to the present invention, bit information of a plurality of minor transfer element loops can be read using only one stretcher.

Therefore, the two problems of the conventional means described above can be solved. In addition, if only one gear is used, when the rotating shaft rotates in the opposite direction,
Replicated magnetic bubbles may enter the minor transfer element loop. In this application, a special guardrail is provided to prevent the magnetic bubbles that have passed through the stretcher from returning, thereby preventing this from occurring.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the magnetic bubble element according to the present invention, Fig. 2 is a diagram showing the shape of the transfer element of the card rail of the element in Fig. 1, and Figs. 3 to 5 are diagrams showing the conventional example. The figure shown in FIG. 6 is a diagram showing the transfer element at the corner portion of the card rail in FIG. 2. 1... Magnetic bubble element, 11, 12. 15... Magnetic bubble, 131. Guardrail, 148, 14B, 14
C...Replicator, 16...Stretcher, 17...
Magnetic bubble detector, 22.23... Major transfer element loop, A, B, C... Minor transfer element loop.

Claims (1)

[Claims] A plurality of minor transfer element loops in which a pattern of magnetic bubbles based on the principle of a memory wheel is written, and the number of magnetic bubbles that can exist on the loop is in a relationship that they do not have a common divisor. a stretcher that stretches magnetic bubbles into a long and thin strip; a magnetic bubble detector installed near the stretcher to detect magnetic bubbles passing through the stretcher; and a magnetic bubble detector installed in a part of each of the minor transfer element loops. a duplicating means for duplicating the magnetic bubbles transferred on the minor transfer element loop; a major transfer element loop for guiding the duplicated magnetic bubbles to the stretcher; and a transfer element capable of bidirectional transfer; Magnetic bubbles passed through the stretcher via a means provided to surround the minor transfer element loop, the stretcher, the magnetic bubble detector, and the major transfer element loop, and having a function of preventing the magnetic bubbles from returning to the stretcher side. A guardrail that accepts , and a magnetic bubble element with .