JPH054112Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a tape position detection device that detects the running state of the tape using optical detection means in a vacuum buffer type magnetic tape device.

[Conventional technology]

Conventionally, as a tape position detection device for this type of magnetic tape device, for example, the Japanese Patent Publication No. 58-33627
As shown in the above publication, a light emitting element such as a lamp is placed on the wall that becomes the running surface of the tape running path formed inside the vacuum buffer box so as to be oriented in a direction perpendicular to the surface of the magnetic tape. It has generally been common practice to arrange light receiving elements such as solar cells to face each other. In this case, the light-emitting element may be a single one, but the light-receiving element may be provided at multiple locations along the tape running direction of the tape running path and configured to be able to detect the running position of the tape. Of course.

[Problem that the invention attempts to solve]

However, in the conventional configuration as described above,
Since the light-emitting element and the light-receiving element for detecting the tape running position are provided on the wall that constitutes the running surface of the tape running path, the following problems arise.

In other words, in order to minimize the frictional resistance of the tape when running, it has been conventional practice to attach a slip sheet or the like to the tape running surface. It is necessary to drill holes in the above-mentioned slip sheet as a window for transmitting and receiving light, and the processing work is troublesome and complicated. In addition, various types of dust, including the magnetic material of the magnetic tape that runs in sliding contact with the tape running surface, tend to accumulate in each hole that serves as a window, as described above, and as a result, the light emitting element to the light receiving element This may lead to problems such as blocking the passage of light to the tape and making it impossible to detect the tape running position properly and reliably, so it is desired that some kind of countermeasure be taken.

[Means for solving problems]

The tape position detection device in the magnetic tape unit of this invention comprises a light-emitting element disposed in a vacuum buffer box, facing toward the opening at the back of the tape running path, and a number of light-receiving elements oriented parallel to the surface of the magnetic tape, disposed on the side walls of the tape running path along the running direction of the tape running path.

[Effect]

According to the present invention, a light emitting element and a light receiving element are provided at a location other than the running surface of the magnetic tape, and the tape position is determined by the difference in the amount of light generated between the area surrounded by the tape loop and the other area. It is something to detect.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 1 shows an embodiment of a tape position detecting device in a magnetic tape device according to the present invention. In the figure, first, the general structure of the magnetic tape device, which is indicated by reference numeral 1, will be briefly described. 2 is a supply reel, 3 is a take-up reel, and the magnetic tape 4 is sequentially fed out from the supply reel 2 and passed through a tape running path 6 formed in a vacuum buffer box shown by 5 to the take-up reel 3 side. It runs sequentially and is wound up.

Now, according to the present invention, in the magnetic tape device 1 having the above-described structure, as shown in FIGS. A light emitting element 10 is disposed facing toward the opening side of the tape running path portion farthest from the entrance (top and bottom in the figure), and a side wall of the tape running path 6 (magnetic tape 4
A plurality of light receiving elements 11 oriented in a direction parallel to the surface of the magnetic tape 4 are disposed along the running direction of the tape running path 6 on one of the walls on both sides in the width direction of the magnetic tape 4. It has some characteristics. Although this embodiment shows the case where the light receiving element 11 is provided on the wall surface of the base plate 8 of the vacuum buffer box 5, it is of course possible to provide it on the wall surface side of the cover 9.

According to the above-mentioned configuration, although the light emitting element part and the light receiving element part do not face each other as in the conventional case, in the tape running path 6, the part surrounded by the tape loop and the part not surrounded by the tape loop are different from each other. Since there are differences in the amount and intensity of the light, the position of the tape loop portion within the traveling path 6 can be easily and appropriately recognized, and the fact that the tape position can be detected reliably is shown in Figure 1. This can be easily understood from the situation.

Therefore, according to the present invention, as described above, the light emitting element 10 and the light receiving element 11 for detecting the running position of the magnetic tape 4 within the tape running path 6 are placed within the running path 6 of the magnetic tape 4. Although the position of the magnetic tape 4 can be properly detected by installing it in a location other than the running surface, if a slip sheet with special perforations is attached to the tape running surface as in the past, This eliminates the need for a complicated and cumbersome configuration that causes problems such as clogging and dirt, and has the advantage that the frictional resistance of the tape running on the tape running surface is small, and the number of light emitting elements 10 can be reduced. It becomes possible to perform.

Here, the light emitting element 10 described above may be any light source such as a lamp or an LED (light emitting diode), and the light receiving element 11 that receives light from the light emitting element 10 may be a light receiving element such as a photodiode or the like. Any sensor that can obtain the same function as this sensor may be used, including a physical type sensor.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part may be modified and changed as appropriate. For example, in order to allow the light receiving element 11 to more appropriately receive the light from the light emitting element 10, as shown in FIG.
1 may be disposed obliquely.

[Effect of idea]

As explained above, according to the tape position detection device for a magnetic tape device according to the present invention, a light emitting element is disposed in the inner part of the tape running path in a vacuum buffer box, oriented toward the opening side, and A plurality of light-receiving elements oriented parallel to the surface of the magnetic tape are arranged along the running direction of the tape running path on the side wall of the running path, which allows for a simple and inexpensive configuration. Regardless of the situation, it is possible to easily and appropriately detect the position of the magnetic tape within the running path, and it also reduces the frictional resistance of the tape running on the tape running surface compared to conventional methods, and also makes it possible to detect the tape position from dirt, etc. It has various practical effects such as being able to have a configuration with less influence, and also facilitating workability and simplifying the configuration compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of a vacuum buffer type magnetic tape device to which the magnetic tape position detecting device according to the present invention is applied, and FIG. 2 is a schematic side view of the tape position detecting section which is a characteristic of the device FIG. 3 is a diagram showing a modification thereof. 1... Magnetic tape device, 2, 3... Supply, take-up reel, 4... Magnetic tape, 5... Vacuum buffer box, 6... Tape running path, 10... Light emitting element, 1
1... Light receiving element.

Claims (1)

[Scope of utility model registration request] The magnetic tape fed out from the supply reel is passed through a tape running path formed in a vacuum buffer box.
In a magnetic tape device that sequentially runs toward a take-up reel, a light-emitting element is disposed in the back of the tape running path in the vacuum buffer box so as to face the opening side, and a light emitting element is disposed on a side wall of the tape running path. Multiple light-receiving elements are oriented parallel to the surface of the magnetic tape.
1. A tape position detection device in a magnetic tape device, characterized in that it is disposed along the running direction of a tape running path.