JPH0119227Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotating magnetic head device suitable for use in a VTR or in PCM recording and reproduction.

BACKGROUND ART AND PROBLEMS First, an example of a rotating magnetic head device used in a conventional VTR will be explained with reference to FIG. The figure is a longitudinal sectional view of the same, and 1 is a tape guide drum;
2 is the upper drum, and 3 is the lower drum. The lower drum 3 is a fixed drum, and the upper drum 2 is a rotating drum. Reference numeral 4 denotes a rotating shaft, which is supported on the lower drum 3 by a bearing 5. 6 is a flange attached to the rotating shaft 4, and 7 is a mounting screw thereof.

The upper drum 2 is attached to the upper surface of the flange 6 with screws 8. 9 is a center hole formed in the upper drum 2. A single head mounting plate 10 is attached to the lower surface of the upper drum 2 with screws 11, and a magnetic head (head chip) 12 is attached to the tip of the head attachment plate 10 by adhesive or the like. 13 is the screw hole 21 of the upper drum 2
The tip of the screw is screwed into the magnetic head 12, and its tip is brought into contact with the head mounting plate 10, and by pushing down the head mounting plate 10, so-called height adjustment of the magnetic head 12 is performed.

According to this configuration, after the head mounting plate 10 with the magnetic head 12 attached thereto is attached to the upper drum 2, it is necessary to adjust the amount of protrusion of the magnetic head 12, the angle division, and the height pairing of the magnetic heads. These adjustments were complicated.

Purpose of the invention The present invention avoids the above-mentioned drawbacks and makes it possible to omit at least the adjustment of the protrusion amount and the angle adjustment of the magnetic head.

Summary of the invention The present invention includes a cylindrical surface that is surfaced with a predetermined radius on the outer circumference of a flange that fits on the rotating shaft, and a cylindrical surface that is continuous with the cylindrical surface and has a predetermined axis of the rotating shaft. A rotary drum is provided with a head mounting plate forming a stepped portion having a flat surface with a height in the direction, and having a central hole sized to exactly fit with the cylindrical surface of the flange. A magnetic head is attached to the outer periphery of the head mounting plate, and the head mounting plate is clamped and fixed to the flat surface of the flange between the flange and the rotating drum, and is screwed onto the rotating drum. The tip of the attached screw is brought into contact with the head mounting plate at the rear of the magnetic head.This allows the magnetic head to be mounted on the head mounting plate in advance, so that the so-called angle division and protrusion amount can be adjusted respectively. It can be selected accurately.

Embodiment An example of a rotating magnetic head device according to the present invention will be described with reference to FIG. 2 and subsequent figures. Parts corresponding to those in FIG.

The flange 6 in the present invention has a cylindrical surface 1 on the cylindrical portion.
4 and a continuous flat surface 15. This cylindrical surface 14 has a radius set to a required value and is flattened, and the flat surface 15 also rotates. The height of the shaft 4 in the axial direction is set to a required value and the surface is raised.

On the other hand, the head mounting plate 10 according to the present invention is composed of a circular plate having a thickness of about 1.5 mm and made of a material having appropriate elasticity, such as _BS material,
At its center is a center hole 17 formed in a size that fits exactly into the cylindrical surface 14 of the flange 6 mentioned above.
has. A pair of head mounting portions 18 are formed at symmetrical positions on the periphery thereof. That is, a pair of slits 19a and 19b are formed inward from the periphery of the head mounting plate 10, and these slits 19a and 19b are separated from other parts in the circumferential direction of the head mounting plate 10. A head mounting portion 18 is formed by this. 20 is a through hole for the screw 8.

The magnetic head 12 is attached to the tip of the head attachment part 18 by adhesive, and during this attachment, the angle division and protrusion amount of the pair of magnetic heads 12 are accurately selected. Since the center hole 17 of the head mounting plate 10 is formed accurately, it can be easily and accurately mounted by using a necessary jig that can fit the center hole 17 of the head mounting plate 10.

Furthermore, the inner surface of the center hole 9 of the upper drum (rotating drum) 2 is also selected to have a size that just fits into the cylindrical surface 14 of the flange 6 mentioned above. The mounting position of the upper drum 2 relative to the rotating shaft 4 is determined by the length of the upper drum 2 placed on the upper drum. The head mounting plate 10 is attached to the flat surface 1 of the flange 6 by the upper drum 2 and the flange 6.
5.

In addition, as shown in FIG. 4, on the bottom surface of the upper drum 2,
A recess 22 is formed at a position on the head mounting plate 10 facing the head mounting portion 18 and has a larger area than the head mounting portion 18, thereby escaping the head mounting portion 18 of the head mounting plate 10.

Effects of the Invention As described above, according to the present invention, the magnetic head (head chip) 12 is configured to be attached to the head mounting plate 10 positioned by the flange 6, so that it is easy and accurate in this attachment process. Since the magnetic head can be positioned and mounted, it has the great feature that there is no need for so-called angle adjustment or protrusion amount adjustment of the magnetic head after assembly is completed.

Also, on the plane 15 of the flange 6, a magnetic head 12 is mounted.
Place the head mounting plate 10, which has been previously attached, with its center hole 17 fitted into the cylindrical surface 14 of the flange 6, and place the upper drum 2 with its center hole 9 fitted into the cylindrical surface 14 of the flange 6. The head mounting plate 10 is fitted and placed, and then tightened with the screws 8.
can be reliably mounted in a predetermined position while being sandwiched between the flange 6 and the upper drum 2, and then by simply rotating the screw 13, the head mounting portion 18 can be mounted with the slits 19a and 19b. The width of the magnetic track can be adjusted by simply adjusting the pairing height of the head.
It has the great feature of being able to adequately cope with high-density recording at 10 μm or less.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional rotating magnetic head device, FIG. 2 is a sectional view showing an example of a rotating magnetic head device according to the present invention, and FIG. 3 is an example of a head mounting plate that can be used in the present invention. FIG. 4 is a perspective view showing an example of an upper drum that can be used in the present invention. 2 is the upper drum, 3 is the lower drum, 6 is the flange,
10 is a head mounting plate, and 12 is a magnetic head.

Claims (1)

[Claims for Utility Model Registration] A cylindrical surface that fits onto a rotating shaft and is surfaced with a predetermined radius, and a height in the axial direction of the rotating shaft that is continuous with the cylindrical surface and is predetermined. a rotating drum; a head mounting plate having a center hole that fits into the cylindrical surface of the flange; a magnetic head; and a member for fixing the head mounting plate in a sandwiched state between the flange and the rotating drum with respect to the flat surface of the flange, and a member having slits in the head mounting plate on both sides of the magnetic head. At the same time, the tip of the adjustment screw screwed onto the rotating drum is
A rotating magnetic head device that is brought into contact with the head mounting plate at the rear of the magnetic head so as to perform pairing adjustment of the magnetic heads.