JPH0430361A - Cylinder for magnetic recording and reproduction - Google Patents

Abstract

PURPOSE:To suppress deformation of a stator cylinder at fixing and to make recording and reproduction stable by providing a slit notch to a cylinder side face around a stator of a cylinder stator member, decreasing the thickness of the cylinder side face more than other part of the cylinder and decreasing the stiffness of the stator. CONSTITUTION:A slit 3 and a mount screw hole 4 are provided to a stator 2 and a stator cylinder 1 is fixed with a cylinder stator member 5 by a mount screw 6. The deformation of the stator cylinder 1 due to a minute shape of each stator face of the stator cylinder 1 and the cylinder stator member 5 is less because the stator 2 with low stiffness receives the effect largely. Thus, the deformation of the stator cylinder is small and the magnetic tape wound on the cylinder is guided normally, then the recording and reproduction of a magnetic tape are made stable.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention comprises a rotating cylinder having one or more magnetic heads that rotates once, and a track for guiding a magnetic tape wound around the outer circumference. The present invention relates to a fixed cylinder of a magnetic recording and reproducing apparatus that records and reproduces information using a magnetic tape as a medium.

[Conventional technology]

The fixed type iI! is a magnetic recording and reproducing device that records and reproduces information on a magnetic tape by rotating and scanning a magnetic head. This plays an important role as a method that can effectively record a large amount of signal information compared to devices that record and reproduce information using a magnetic head.

In recent years, the quality of audio and video signals has been improved, and at the same time, signals have been digitized, and the amount of signal information tends to increase more and more. Therefore, high-density recording and reproduction is required for these amounts of signal information, and accordingly, a highly accurate recording and reproduction apparatus is required.

FIG. 5 is a sectional view showing the relationship between the attachment of cylinder peripheral parts in a conventional rotary magnetic recording and reproducing device.

In this figure, the magnetic head 7 is attached to a rotating cylinder 8,
The rotating cylinder 8 is connected to a cylinder motor 10 via a drive shaft 9. The drive shaft 9 is supported by a fixed cylinder 1 with a bearing 11 in between, and these cylinders as a whole are tilted by α° and fixed to a cylinder fixing member 5 by a mounting screw 6.

Also, conventionally, as in Japanese Patent Application Laid-Open No. 61-82359.

There are two methods of mounting between the fixed cylinder and the cylinder fixing member: one is to install a member, and the other is to fix it with a mounting screw using a coil spring, but both methods require a large number of parts and are difficult to set the spring pressure. There are drawbacks such as.

[Problem to be solved by the invention]

In the prior art described above, the fixed cylinder 1 and the cylinder fixing member 5 have screw holes or holes provided directly in their respective bodies, and are fixed to each other by mounting screws 6.

Here, if there are slight inclinations or irregularities on the fixed part surfaces of the fixed cylinder 1 and the cylinder fixing member 5, the fixed cylinder] and the cylinder fixing member S may be fixed by tightening the mounting screw 6. The fixed cylinder 1 is deformed by force due to the minute shape of the fixed part surface and the fastening force of the mounting screw. Therefore, the fixed surfaces of the fixed cylinder 1 and the cylinder fixing member 5 need to be flat. but,
Currently, it is difficult to flatten with high precision due to productivity, cost, and processing methods, and there is some degree of inclination or unevenness.

FIG. 6, FIG. 7, and FIG. 8 clearly show this situation in a case where the fixing portion surface of the cylinder fixing member 5 has an inclination. As shown in Fig. 6, the cylinder 1 is fixed to the cylinder fixing member 5 whose fixed part surface is inclined inward.
When fixed, the fixed cylinder 1 undergoes deformation as shown in FIG. Moreover, if the fixed part surface is inclined outward, deformation occurs as shown in FIG.

If the fixed cylinder is deformed in this way, it will no longer be possible to properly guide the magnetic tape 12 wound around the cylinder.

11, 12, and 13 show the relationship among the fixed cylinder 1, magnetic tape 12, and magnetic head 7. FIG. 11 shows how the magnetic tape 12 and the magnetic head 7 come into contact in a normal case. Here, if the uppermost end of the fixed cylinder is deformed inward as shown in Figure 7, it will come into contact as shown in Figure 12, and if it is deformed outward as shown in Figure 8, it will come into contact as shown in Figure 12. The contact will be as shown in Figure 13.

Therefore, the deformation of the fixed cylinder 1 causes the magnetic tape 12 and the magnetic head 7 to come into contact with each other unevenly, resulting in partial tracking deviation as shown in FIG. 14. The tracking deviation in this case is difficult to adjust mechanically or electrically, and causes unstable recording/reproduction and deterioration of the reproduction signal.

The object of the present invention is to provide a fixed cylinder and a cylinder fixing member 5.
The object of the present invention is to significantly suppress the deformation of the fixed cylinder 1 during fixation without being affected by the precision of the fixed part surface of the fixed cylinder 1, thereby stabilizing recording and reproduction.

[Means to solve the problem]

In order to achieve the above object, the present invention reduces the wall thickness and width of the fixed portion of the fixed cylinder with the cylinder fixing member7, thereby reducing the rigidity of the fixed portion. That is, a slit-like cut is provided around the fixed part to reduce the thickness and width of the fixed part.

[Effect]

The fixed part of the fixed cylinder whose rigidity has been lowered by the above means is more susceptible to deformation due to the minute shape of the fixed part surface and the fastening force of the mounting screw, or the effect is small on the outer circumferential surface of the fixed cylinder. The fixed cylinder σ deformation is suppressed, and as a result, recording and reproduction are stabilized.

〔Example〕 An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram of the fixed cylinder 1 viewed diagonally from below. FIG. 2 is a sectional view of one of the fixing parts.

In FIGS. 1 and 2, the fixed part 2 is the fixed cylinder 1.
Since the slit 3 is provided in the slit 3, the wall thickness and width are small. The fixed part 2 is provided with a mounting screw hole 4,
It is fixed to the cylinder fixing member 5 by mounting screws 6 .

With the fixed cylinder 1 having such a structure, the fixed cylinder 1 is deformed due to the minute shape of each fixed part surface of the fixed cylinder 1 and the cylinder fixing member 5, and the fixed part 2, which has low rigidity, is greatly affected by the deformation. Because of this, there are fewer

This will be explained in an easy-to-understand manner using FIGS. 9 and 10.

When the fixed cylinder 1 having this structure is attached to the cylinder fixing member 5 whose fixing part has an inclination as shown in Fig. 9, the fixing part 2 is largely deformed due to the inclination of the fixing part as shown in Fig. 10. There is little effect on the cylinder outer circumferential surface.

Therefore, the deformation of the fixed cylinder becomes minute, and the magnetic tape wound around the cylinder can be guided normally, so that recording and reproduction on the magnetic tape becomes stable.

FIG. 3 is a diagram of another embodiment of the present invention viewed diagonally from below. In this embodiment, the slit 3 is provided only on the side surface of the cylinder, and the wall thickness of the fixing portion 2 is reduced, so that processing is easier and more convenient than in the previous embodiment.

FIG. 4 is also a diagram of another embodiment of the present invention viewed diagonally from below.
A circular or polygonal slit 3 is provided to surround the fixing part 2 to reduce the width of the fixing part 2.

Furthermore, the plurality of fixing parts may have different shapes, and an optimal combination can be selected depending on the mounting condition and cylinder shape.

〔Effect of the invention〕

According to the present invention, the influence of deformation due to the minute shape of the fixed part surface between the fixed cylinder and the cylinder fixed part and the fastening force of the mounting screw can be reduced on the outer peripheral surface of the fixed cylinder. The tape can be guided normally, and as a result, unstable recording/reproducing and deterioration of the reproduced signal, which tend to occur conventionally, are improved, and the performance of the magnetic recording/reproducing apparatus is improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a fixed cylinder according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of one of the fixed parts of FIG. 1. 3 and 4 are perspective views of fixed cylinders according to other embodiments of the present invention, FIG. 5 is a vertical cross-sectional view showing the relationship of attachment of cylinder peripheral parts in a conventional magnetic recording/reproducing device, and FIG. 6 is a perspective view of a fixed cylinder according to another embodiment of the present invention. 10 are longitudinal cross-sectional views of a fixed cylinder and a cylinder fixing member for explaining the present invention in detail, and FIGS. 11 to 13 are longitudinal cross-sectional views of a fixed cylinder and a magnetic head for explaining problems that conventionally tend to occur. FIG. 14 is an explanatory diagram of the locus of a magnetic head scanning over a magnetic tape. 1...Fixed cylinder, 2...Fixed part, 3...Slit. 4...Mounting screw hole, 5...Cylinder fixing member, 6
...Mounting screw, 7...Magnetic head, 8...Rotating cylinder, 9...Drive shaft, 1o...Cylinder motor, 11...Bearing, 12...Magnetic tape.

Claims (1)

[Claims] 1. Consisting of a rotating cylinder having one or more rotating magnetic heads and a fixed cylinder provided with a lead for guiding a magnetic tape wound around its outer periphery, the magnetic tape is used as a medium. In a fixed cylinder of a magnetic recording and reproducing device for recording and reproducing, a slit-shaped cut is provided on the side surface of the cylinder around the fixed part with the cylinder fixing member, and the wall thickness is made smaller than other parts of the cylinder, thereby increasing the rigidity of the fixed part. A magnetic recording/reproducing cylinder characterized by a low . 2. The cylinder for magnetic recording and reproducing according to claim 1, wherein a slit-like cut is provided from the bottom surface of the cylinder around the fixed part to the cylinder fixing member, so that the width of the fixed part is reduced.