JPS6043291A - Displaying method of defective loop of bubble memory element - Google Patents

Abstract

PURPOSE:To display the address of a defective minor loop which is printed previously on an element surface by reducing the address to specific magnification. CONSTITUTION:A print 2 of a number, etc., which is 4mm. square is formed on an original plate 1 of, for example, 10X12cm by exposure and development. In this case, 25X30=750 characters are displayed in the area of this original plate 1. A 4-megabit element has up to 240 defective loops, and when an address is represented by three digits in hexadecimal, 720 characters are possible, so that a sufficient display is obtained on this original plate. Then, the original plate 1 is reduced to, for example, 1/4 by reduction photography. In a figure, 3 is the lens of a reduction exposing device and 4 is the reduced plate of the original plate 1. The plate 4 when reduced to 1/4 is of 2.5X3cm, and the size of print on this plate is 1mm. square. Then, this reduced plate 4 is stuck to a defective loop display area 7 on the surface of the magnetic shield case 6 of a bubble memory element 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a magnetic bubble memory device, and more particularly to a method for displaying an unusable defective loop among a plurality of minor loops on the surface of the device.

(7! Background of the technology The magnetic bubble memory device currently widely used is a major-minor loop system with multiple minor loops, and includes malfunctioning minor loops due to process defects. Bubble memory device When actually operating as a memory, it is necessary to take steps to prevent information from being written into these defective loops, so it is necessary to clarify all defective minor loops before shipping the device. be.

(3) Prior Art and Problems Conventionally, the method for dealing with defective loops in devices has been to attach a data sheet containing the address of the defective loop to the device. However, if the device and data sheet are separate, it will be confusing in devices that use a large number of devices, and if the data sheet is lost, etc.
There is an increasing demand for indicating defective loops on the device itself, and in some cases this is already being done. Now, let us consider displaying the defective loop address on the surface of the element.

Bubble memory devices currently in use have a capacity of 256 bits and 1 megabit, and the external size of the device is about 3 cm square. Since the product type number, lot number, nine company names, etc. are displayed on the surface of the element, the area allowed for displaying the address of the defective loop is approximately 2.5 cm x 3 cm. Furthermore, the size of the type used for the display is at least around 1 ava angle when printing quality is considered, even when printing directly on the element surface by screen printing or the like, or when printing on paper or the like and pasting it on the element surface. Therefore, characters that can be printed within the allowable area (5) Structure of the invention The present invention is based on the fact that the defective loop address does not necessarily need to be printed directly on the element or on paper, and that the printed numbers are not necessarily large enough to be discernible with the naked eye. Taking note of the fact that there is no need to limit the size of the image, an original plate printed to an appropriate size is reduced to an appropriate size using reduction photography technology to fit within an allowable area.

That is, the present invention provides a method for displaying a defective minor loop in a magnetic bubble memory in which the address of a defective minor loop is displayed in a predetermined area on the element surface. The above object is achieved by providing a method for displaying a defective loop in a bubble memory device, which is characterized by reducing the defective loop at a given magnification and then displaying the defective loop on the surface of the device.

(6) Embodiment of the Invention FIGS. 1 and 2 show an embodiment of the defective loop display method according to the present invention.

The number will be around 180 characters. In 256 bit devices, the number of minor loops is approximately 300, and the number of defective loops is at most 2.
Since it is a 0 loop, 3-digit number x 20 = 60 characters,
Can be displayed with ease. In a 1 megabit device, there are approximately 600 minor loops and approximately 60 defective loops, so 3 digits x 60 = 180 characters, which can barely be displayed. However, research on increasing the density of bubble memory devices is progressing year by year, and it is certain that 4-megabit devices and even 16-megabit devices will be realized. The number of defective loops is 240 in a 4 megabit focus element, and 1000 loops in a 16 megabit element, and it is expected that the external dimensions of the element will remain almost the same as they are now. It becomes impossible to display the defective loop address on the surface.

(4) Purpose of the Invention The purpose of the present invention is to display a new method for displaying defective loops on high-density devices such as 4 megabits or 16 megabits on the device, which was impossible with the prior art. 1 Figure is a plan view showing an original plate for an exposure mask. So, this is, for example, lQcmX12co
Prints 2 consisting of 4-dragon digits, etc. are formed on a + original plate 1 by exposure and development.

The area of this original plate 1 can display 25 characters x 30 characters - 750 characters. For a 4 megabit device, the maximum number of defective loops is 24.
Since it is a 0 loop, the address can be expressed in 3 hexadecimal digits as 720.
It is possible to display it sufficiently in the original version.

Next, as shown in FIG. 2(A), the original plate 1 is reduced to, for example, 1/4 using a reduction photographic technique.

In FIG. 2(A), 3 indicates a lens of a reduction exposure machine, and 4 indicates a reduction version of the original 1.

Further, various types of reduction photographic techniques such as wet type and dry type have been put into practical use, and it goes without saying that the object of the present invention can be achieved using any of them.

The reduced version 4 (see Figure 2 (B)), which is reduced to 1/4, is 2.
The size of the print on this plate is 5 cm x 3 cm, and the size of the print on this plate is l u + angle.

Thereafter, the object of the present invention can be achieved by pasting this reduced version 4 on the defective loop display area 7 on the surface of the magnetic shield case 6 of the bubble memory element 5, as shown in FIG. 2(C).

In the case of a 16 megabit device, the original plate 1 is 20cm x 2
If it is 4cm and reduced to 1/8, then 0.5 will appear on the reduced version 4.
1000 loops can be displayed by printing the fin angle.

At this time, it is difficult to distinguish the 0.5 mm square numbers with the naked eye, but they can be easily distinguished by means such as using a magnifying glass.

Note that reduction photography technology is used in the production of bubble memories, ICs, etc., and drawing on the micron order has been established, so a size of this order is not a limiting factor for accuracy.

FIG. 3 shows another embodiment of the invention.

In this example, a photosensitive agent is applied to the surface of the defective loop display area 7 of the magnetic shield case 6 of the bubble memory element 5 in advance to form a photosensitive surface, and a reduced image of the original plate 1 is directly displayed on the element 5. This is how it was done.

In this case, there is an advantage that the number of man-hours can be significantly reduced compared to the case of the first embodiment, in which a reduced version is made and then attached to the element.

In this example, in order to protect the photosensitive surface, protective means such as resin coating is applied to the photosensitive agent area 7''.
Desirable to prevent long-term deterioration.

In the embodiments described above, only defective loops are displayed, but the present invention is not limited to this, and it goes without saying that product type numbers, lot numbers, etc. may also be displayed at the same time.

(7) Effects of the Invention According to the present invention, a defective loop address of a high-density bubble memory element of 4 megabits or more can be easily and precisely displayed on the bubble memory element, which was impossible with the prior art. , its practical effects are remarkable.

[Brief explanation of the drawing]

The drawings all show examples of the present invention, and Fig. 1 is a plan view of the original plate for indicating a defective loop according to the present invention, and Fig. 2 (A
) to FIG. 2(C) are conceptual diagrams showing a method of displaying defective loops using the original example of FIG. 1. [Explanation of symbols] 1...Original plate 2...Printing 3...Reducing lens 4...Reducing plate 5...Pull memory element 7... ...Bad loop display area Figure 1 Figure 3

Claims (1)

[Claims] (In a method for displaying defective loops in a magnetic bubble memory in which the address of a defective minor loop is displayed in a predetermined area on the surface of 11 elements, the address of the defective minor loop is printed in a predetermined size. A method for displaying a defective loop in a bubble memory element, which is characterized by reducing the number by a predetermined magnification and then displaying the defective loop on the surface of the element. (2) An original plate on which a defective minor loop address is printed in a predetermined size. The method for displaying a defective loop in a bubble memory element according to item 1, characterized in that a reduced version is produced by reducing the size of the image by a predetermined magnification, and the reduced version is pasted on the element surface. (3) The element surface is exposed to light. +41 The method for displaying defective loops in a bubble memory element according to item 1, characterized in that a surface is formed and a defective loop is displayed on the photosensitive surface. +41 Item 2, characterized in that a protective film is formed on the element surface. or the method for displaying defective loops in bubble memory devices according to item 3. (5) The method for displaying defective loops in bubble memory devices according to item 1, characterized in that the product, model number, lot number, etc. are displayed at the same time.