JPH04186513A - How to install the magnetic head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of attaching a magnetic head for recording, reproducing, etc. in a VTR cylinder.

[Conventional technology]

The mounting structure of the head in a conventional VTR cylinder is discussed in Home VTR Introduction, Corona Publishing, published December 15, 1980, pages 102 to 103.

Further, this type of structure is disclosed in Japanese Patent Application Laid-open No. 12.6625/1982.

[Problem to be solved by the invention]

The above conventional technology has a large number of parts, and because the head position is adjusted by forcibly moving the head base with a screw, local deformation is applied to the head base, which is released and the adjustment position shifts. These factors were not taken into consideration, leading to problems such as variations in performance and increased manufacturing costs.

In addition, there are examples of attempts to eliminate the need for adjustments by maximizing component accuracy, but this requires a great deal of expense to ensure accuracy.

An object of the present invention is to eliminate the need for screws on the head base and to ensure the relative positional relationship of the head chips without adjustment.

[Means to solve the problem]

In order to achieve the above object, the present invention uses a thin film head in which a coil is formed on the surface of the chit chip by sputtering etc. without the need for winding the head chip, and uses a circular disk fixed to a rotating shaft. After holding the heads with the same height on top and aligning the relative angle of 180° and the amount of protrusion, they were fixed with adhesive to ensure a predetermined relative dimension.

[Effect]

After the disk is fixed to the rotating shaft, the mounting surface is additionally machined based on the shaft, so even if the head held on that surface moves on that surface, there will be no change in height. There isn't. Therefore, a predetermined dimension can be ensured by holding chips with the same head height relative to each other on a disk, moving them on the surface, adjusting the protrusion amount and relative angle, and then fixing them.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. The upper surface 3 of the disk 2 fixed to the rotating shaft 1 has been additionally machined without surface wobbling with the rotating shaft 1 as a reference. The heads 4 and 5 are held on the upper surface 3 of the disc 2. head 4
．． As shown in FIG. 2, the head 5 includes a magnetic film part 7, a coil part 8, and terminal parts 9, 10 on the head surface 6, and the distance L from the bottom surface 11 to the magnetic film part 7 is precisely set. The processing accuracy is approximately ±5 μm. Further, the head surface 6 is inclined with respect to the vertical plane from the bottom surface 11 by the same angle θ□ as the azimuth. The lower cylinder 12 rotatably holds the rotary shaft 1 with a bearing 13 in the center. The upper cylinder 14 fits into the sleeve 15 of the disc 2 and is held on the disc 2. The notch 16 is a relief for the head. FIG. 4 shows an example of the relative dimensions of each head on the disc 2. The protrusion amount L2 of the head has a tolerance of ±2 μm, and the relative angle θ2 of the head has a tolerance of ±20” (equivalent to approximately ±2 μm at the outer circumference of φ40).

Head 4. The height difference between each magnetic film portion 7 of the head 5 is 1μ.
m, and the distance L4 from the bottom reference surface 17 of the lower cylinder 12 of the head 5 has a tolerance of ±20 μm. Head 4 and head 5 each have the same L□ dimension (for example, ±5 μm error) - μm
(comrades within the same group).

The head 4° position of the head 5 is determined using a recognition device that enlarges and displays the magnetic film portion 7 of the head on a monitor via a camera. First, X the head 4.

Move in the Y direction and hold the reference position and protrusion amount L2 dimension together. Next, move head S to X with head 4 as a reference.
direction and the Y direction, and match the 02 dimension and the L2 dimension. Since the upper surface 3 of the disk 2 is machined with high precision, L3 does not change and the combined level difference precision can be ensured. After aligning in this manner, the upper surface 3 and the head 4° and the head 5 are fixed with adhesive or the like. The L4 dimension can be assembled by matching the dimensions of the lower cylinder 14, or by accumulating the machining accuracy of each part. The operating state of the cylinder configured as described above is as shown in FIG.
0 in the direction of arrow P, and the tape 18 is wound around the upper cylinder 14 and the lower cylinder 12 at a predetermined angle.

Head 4. The head 5 rotates together with the upper cylinder 14 in the direction of arrow R, and signals are recorded and reproduced at a relative speed to the tape 18.

In other embodiments, the same effect can be obtained even if the heads fixed at the - location are a combination of a plurality of heads, such as a double azimuth head.

Further, although the present embodiment shows a combination of two heads, the number of heads can be selected arbitrarily, and it is possible to sufficiently cope with a multi-head cylinder.

Further, in this embodiment, the disk is fixed to the rotating shaft, but the same effect can be obtained even if the disk is rotatable about the central axis.

〔Effect of the invention〕

According to the present invention, it is possible to fix the head directly onto the disc with high precision, so after attaching the head to the head base, fix it to the cylinder with a screw, and then attach the head base using another screw. This eliminates the complexity of matching the mutual dimensions between heads. Moreover, the number of parts can be reduced by three or more per head, and productivity can be improved.

[Brief explanation of drawings]

Fig. 1 is an assembled view showing one embodiment of the present invention, Fig. 2 is a perspective view showing details of the head, Fig. 3 is a perspective view showing the operating state of the cylinder using the present invention, and Fig. 4 FIG. 3 is an explanatory diagram of the relative dimensional relationship between the heads. 1...Rotating shaft, 2...Disc, 3...Top surface, 4...Head, 5...Head. Closed 1st ward 20

Claims (1)

[Claims] 1. A head chip having the same height from the mounting surface to the recording and reproducing heads is fixed on a disc fixed to the rotating shaft of the cylinder after being aligned. How to install a magnetic head. 2. In claim 1, if there is a step on the head mounting surface of the fixed disk, the magnetic head mounting method comprises affixing and fixing the head chip whose height of the head is selected to match the step. . 3. The magnetic head mounting method according to claim 1 or 2, wherein the disk is rotatable about an axis and the method of attaching and fixing the head chip is applied.