JPS6144245Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a case for constantly protecting a magnetic drum type audio output device. This relates to cases where recorded contents can be erased.

Recently, it has been proposed that a magnetic drum system would be effective in announcing systems for automobile OK monitors, vending machines, various terminal devices, elevators, various public notice devices, and the like. In these applications, there are requirements such as being able to directly record/playback audio signals (analog signals) and being able to access a large number of messages at random. This is because the above requirements can be met by recording/reproducing information (messages) on each track via a magnetic head.

However, in this case, changes in recorded messages do not occur often, but that does not mean they never occur. Therefore, in conventional systems, magnetic heads for erasing and erasing circuits, etc., were built-in, but adding an erasing device to handle rarely occurring message changes is important for miniaturization and simplification of equipment. This is not a desirable thing from the viewpoint of reduction in cost and price reduction.

Since the case is usually made of magnetic material for magnetic shielding, it is sometimes possible to remove the case or part of it and bring a demagnetizer close to the magnetic drum to erase the recorded content, but this is a cumbersome operation. Yes, there were also some drawbacks in terms of waterproofing and dustproofing. If dust or the like adheres to the magnetic head or magnetic drum surface during the erase operation, it will adversely affect the recording/playback characteristics, and if the case, etc. is not properly attached after the erase operation, dust or the like may easily enter. This is because, considering that this type of magnetic drum device can be installed in a wide variety of locations and no special precautions are taken, this has a significant impact on the frequency of safety inspections and the service life of the device.

The purpose of the present invention is to eliminate these drawbacks of the conventional technology, allow anyone to easily erase recorded content, do not require a built-in special erasing device, and reduce the size of the magnetic drum type audio information output device. The purpose of the present invention is to provide a case that can be manufactured quickly and inexpensively.

In order to achieve this purpose, according to the present invention,
An opening is formed in a part of the case made of magnetic material, and a non-magnetic material is installed in a concave shape on the inside so as to close the opening, making the entire structure almost sealed, and the case is inserted through the window closed with the non-magnetic material. It is configured so that the recording on the magnetic drum can be erased from the outside.

The present invention will be explained in detail below based on the drawings. FIG. 1 shows an embodiment of the present invention. The present invention is a case with a nearly sealed structure that houses a magnetic drum type audio output device inside and has a dustproof function to protect it. As mentioned above, this audio output device records a large amount of audio information on the magnetic recording medium 2 on the circumferential surface of the magnetic drum 1, which is rotatably supported so as to be driven by a motor (not shown). ,
Audio information recorded on the magnetic recording medium 2 is reproduced by a magnetic head 4 which is movable in the rotational axis direction by a track selection device (not shown). The case may house not only such a magnetic drum mechanism but also drive units such as motors, pulleys, etc., and their control units.

Now, the case 10 is mainly made of a magnetic material such as an iron plate, has an opening formed in a part thereof, and has a window 11 fitted with a non-magnetic material (for example aluminum) so as to close the opening. It is a structure. The window portion 11 is located close to and opposite to the circumferential surface of the magnetic drum 1 housed inside, and its shape extends approximately over the axial length (height of the circumferential surface) of the magnetic drum. , and has a concave shape when viewed from the outside of the case.

A preferred structure, as shown in FIG. 2A, is to provide an opening in a part of the iron case body 10a, recess the edge of the opening inward, and insert a dish-shaped aluminum member 12a into the opening from the outside of the case. It has an insertion bonded structure. More simply, a flat aluminum member 12b may be abutted and fixed to an opening provided in the iron case body 10b from inside the case.

Now, according to the present invention, in order to erase the recorded content, there is no need to remove the case or a part thereof, and it is sufficient to simply apply the AC demagnetizer 15 to the window 11 from outside the case. At this time, since the window portion 11 has a concave shape as described above, the demagnetizer 15
is easy to position.

In order to re-record after erasing, a recording current may be applied to the magnetic head 4 while rotating the magnetic drum 1. As a preferable specific example, Case 1
0 is provided with a recording jack 20, and the jack 20 is connected to the magnetic head 4 as shown in FIG.
It is configured to be connected to a reproduction amplifier 21 and a speaker 22. When outputting audio, nothing is inserted into the recording jack 20. In that case, since the magnetic head 4 and the reproduction amplifier 21 are connected, the signal from the magnetic head 4 is transmitted to the reproduction amplifier 21.
The signal is amplified by the speaker 22 and becomes sound. When recording after erasing, a plug connected to the output of an external recording circuit is inserted into the jack 20. As a result, the magnetic head 4 is connected to the recording circuit, so that recording can be performed on the magnetic drum 1 from the outside. A combination of a switch and a terminal may be used instead of an automatic switching jack. In this way,
This is preferable because it eliminates the need to incorporate recording circuits that are not often used into the case.

Since the present invention is surrounded by a case mainly made of magnetic material as described above, it is possible to protect the internal device and recorded contents by preventing dust and shielding from external magnetic fields, and even in the case of erasing the recorded contents. There is no need to open the case; anyone can easily do this by simply approaching the window with the demagnetizer from the outside; it also solves the problems of waterproofing and dustproofing, and there is no need to have a special built-in erasing mechanism. It has great practical effects, such as being able to be smaller and cheaper. In particular, if the recording circuit is not built-in and the recording current is supplied to the magnetic head from the outside via a jack or terminal when necessary, further miniaturization and cost reduction can be achieved. .

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention;
Figures A and B are explanatory diagrams showing an example of the window section, and Fig. 3 is an explanatory diagram showing a part of the recording/playback mechanism. 1... Magnetic drum, 2... Magnetic recording medium, 4...
...Magnetic head, 10...Case, 11...Window part,
15... Demagnetizer.

Claims (1)

[Scope of utility model registration request] A case for storing a magnetic drum type audio output device inside, the case is mainly made of magnetic material, and is located at a position close to and opposite to the circumferential surface of the magnetic drum, and extends over almost the axial length of the magnetic drum. A magnetic drum type audio output device with an opening and a non-magnetic material installed in a concave shape when viewed from the outside of the case so as to close the opening to form a window for approaching the degausser, resulting in a nearly sealed structure. Case for equipment.