JPS63100695A - Magnetic bubble memory cassette device - Google Patents

Abstract

PURPOSE:To protect data by interlocking a data erasure circuit of a bubble memory device and a cover open/close detection sensor of a cassette holder so as to erase all data when a cover is opened carelessly. CONSTITUTION:The cover 24 is opened, the cassette case 1 is loaded to a position shown in dotted lines in the cassette holder 2 and the cover 24 is closed. A control system main device 20 of the holder 2 controls the operation of the memory device 10 by the control of a host computer 3 and applies, e.g., data is stored. In opening the cover 24 after that, a detection sensor 21 detects it immediately and applies an output to an erasure control circuit 22. The circuit 22 operates an erasure coil 11 in the case 1 via an interface 23 and the stored data are erased momentarily. Thus, the data protection is attained.

Description

[Detailed Description of the Invention] [Summary] When a cassette case housing a magnetic bubble memory device is configured to be removably attached to a cassette holder, a sensor is provided to detect opening and closing of a lid for attaching the cassette case to the holder, and the sensor This is a magnetic bubble memory cassette device designed to protect data security by driving a circuit that erases the memory contents of the bubble memory device when activated.

[Industrial Field of Application] The present invention relates to a bubble memory cassent device in which a cassette case containing a magnetic bubble memory device is detachably attached to a cassette holder.

Conventional cassette devices of this type use bubble memory devices.
By removing the cassette case from the cassette holder and inserting it into a cassette holder of the same type, valuable data could be easily stolen. Therefore, it has been requested to consider data protection measures for cassette devices.

[Conventional technology] Fi! It is known that a cassette case containing an air bubble memory device is detachably attached to a cassette holder. If the memory device is in cassette format, even if the individual cassettes have a small capacity, they can be used interchangeably to create a large capacity storage device. In conventional devices, the cassette holder is equipped with a sensor that detects when the lid is opened and closed to attach the cassette case to the holder.
For example, a switch in the power supply circuit was opened to stop the operation of the write/continue output circuit for the bubble memory device when it was detected that the bubble memory device had been opened. Further, when the lid was closed, the switch was closed.

[Problems to be solved by the invention] In the conventional sensor that detects the opening and closing of the cassette holder lid,
The only control is such that the operation is stopped when the lid is opened, and the write/continue output circuit becomes operational when the lid is completely closed. Therefore, to open the cassette holder's lid, take out the cassette case, attach it to the same type of cassette holder, and then... j! It was not possible to detect when the data was separated by 2, such as when the cassette case was returned to its original position after production.

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks and to provide a bubble memory cassette device that can erase all data to protect the data when the lid of the cassette holder is carelessly opened.

[Means for Solving the Problems] FIG. 1 is a diagram showing the basic configuration of the present invention. In FIG. 1, 1 is a bubble memory cassette case, 2 is a bubble memory cassette holder, 3 is a host computer, 10 is a bubble memory device, 11 is an erase coil, 20 is a control system main device, and 21 is a lid of the memory cassette holder 2. opening/closing detection sensor, 22 is a memory device erasure control circuit, 2
3 indicates an interface, and 24 indicates a lid of the cassette holder.

The cassette case 1 containing the magnetic bubble memory device 10 is configured to be removably attached to the cassette holder 2, and the sensor 21 detects that a lid 24 that opens and closes to attach the bubble memory cassette case 1 to the cassette holder 2 is operated.
In the magnetic bubble memory cassent device provided in the cassette holder 2, the present invention has the following configuration. That is, when the lid opening/closing detection sensor 21 detects that the lid 24 is opened, the erasing control circuit/erase coil 22, 23, 11 for erasing the memory contents of the bubble memory device 10 is driven.

[Operation] In FIG. 1, a bubble memory device 10 is housed in a cassette case 1 and is detachably attached to a cassette holder 2. Now, open the shell 24, attach the cassette case 1 to the position shown by the dotted line on the cassette holder 2, and close the M24. The cassette holder 2 is controlled by the host computer 3.
A control system main device 20 controls the operation of the memory device 10 and stores data, for example. When 124 of the cassette boulder 2 is subsequently opened, the detection sensor 21 immediately detects the detection and applies the output to the erasure control circuit 22. The control circuit 22 connects the cassette case l via an interface 23.
The erase coil 11 inside is operated. Therefore, the stored data is instantly erased.

[Embodiment] FIG. 2 specifically shows the configuration of a cassette holder 2 and a cassette case 1 as an embodiment of the present invention. In FIG. 2, 21 is a lid opening/closing detection sensor, of which 21-
1 is a light emitting diode, 21-2 is a light receiving diode, and the two opposing diodes form a photocoupler. A light shielding part 21-3 is located between the two diodes, and a lid 2 of the cassette holder is provided.
It is linked to 4.

That is, when the lid 24 is closed, light is blocked and the light receiving diode 21-2 does not operate, and when the M24 is opened, the light cannot be blocked and the light receiving diode 21-2 is activated.

At this time, the detection output of the lid opening/closing detection sensor 21 is obtained at the signal terminal 25 for the memory device erasure control circuit 22. Therefore, the erase control circuit 22 drives the erase coil 11 of the cassette case 1 via the interface 23 to erase (initialize) the data stored in the bubble memory device. The interface 23 in FIG. 2 is mainly formed by a pin and its socket. Note that the signal controller 25 simultaneously notifies the host computer 3 that the lid has been opened, and stores the data in the recording tα device built in the host computer 3. When opening [24] of cassette holder 2 and immediately closing it,
Since this fact cannot be seen from the outside, there is no evidence of intrusion from the outside, and the data on the memory device has been erased in order to remember that the M24 was opened due to an erroneous operation. be.

Next, in FIG. 2, the operating power source 5 of the erase control circuit 21 is the same as the operating power source of the lid opening/closing configuration sensor 21, and the control system main device 2
For power source 0, the power source 4 is configured as a separate system. This is because the power supply 4 of the control system main unit 20 is turned off to reduce power consumption when interrupting processing for the bubble memory cassette l, so the lid opening/closing detection sensor 21 does not operate, so the lid 24 of the cassette holder is closed. Even if you open it and steal the data, you won't know. Therefore, the power supply for the detection sensor 21 is provided in a separate system from that of the main device 20 so that the data erasing effect caused by abnormal operation of opening and closing the lid is always activated.

A switch 6 is inserted between the erase control circuit 21 and its electric 50F 5 element 5, and is placed at a position where only those inside can see it. At that time, it can be used only when it is necessary to take out the cassette case without erasing the data stored in the memory device.

[Effects of the Invention] Thus, according to the present invention, the data erasing circuit of the bubble memory device is linked with the lid opening/closing detection sensor of the cassette holder, so that when the lid is opened inadvertently, data protection is prevented. Therefore, all data can be erased.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of the present invention, FIG. 2 is a diagram showing the configuration of an embodiment of the present invention. 1...-Magnetic bubble memory cassette 2-・Bubblemerica set holder 3-Host computer 10--Bubble memory device 11--Erase coil 21・-Lid opening/closing detection sensor 22-Memory device erase control circuit 24...-Cassette holder lid Patent applicant: Fujitsu Limited Representative patent attorney: Eisuke Suzuki Uninvented original I3' Bridge drawing Figure 1

Claims (1)

[Claims] I. A cassette case (1) containing a magnetic bubble memory device (10) is configured to be removably attached to a cassette holder (2), and the bubble memory cassette case (1) is attached to the cassette holder (2). In a magnetic bubble memory cassette device, the cassette holder (2) is equipped with a sensor (21) that detects that a lid (24) that is opened and closed for mounting is operated, and the detection sensor (21) detects that the lid (25) is opened. A magnetic bubble memory cassette device characterized in that the circuit (22), (23), and (11) for erasing the memory contents of the bubble memory device (10) is driven by the output detected. II. Claim 1 characterized in that the power supply (5) of the lid opening/closing detection sensor (21) is configured in a separate system from the power supply (4) of the operation control system of the memory cassette holder (2).
The magnetic bubble memory cassette device described in Section 1.