JPH04117601A - Rotary magnetic head drum - Google Patents

Abstract

PURPOSE:To reduce the transmission loss of signals in a rotary transformer and to improve a picture quality by attaching a rotary transformer rotor through adjusting members whose attaching positions can be adjusted in upward and downward directions. CONSTITUTION:The outer peripheral face of a disk 12 is threaded a ring-shaped adjusting member 11 whose inner peripheral face is threaded is screwed into the screw part, and the top edge face of a rotary transformer rotor 10 is fixedly adhered to the bottom edge face of this adjusting member 11. A rotary transformer stater 7 is inserted into a down drum 1, and the downside edge face is fixedly adhered. That is, the attaching position of the rotary transformer rotor 10 is adjusted, so that the coil groove of the rotary transformer stater 7 can be accurately opposed to the coil groove of the rotary transformer rotor 10. Thus, the transmission loss of the signals can be reduced, and a performance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a rotating magnetic head drum used in video tape recorders and the like.

<Summary of the Invention> The present invention adhesively fixes the rotor of a rotary transformer that transmits signals to a ring-shaped adjustment member with a thread cut on the inner circumference.
By screwing it into a disk with a thread cut on the outer periphery and turning the adjustment member, the rotary transformer rotor can be moved up and down, thereby adjusting the coil grooves of the rotor and stator of the rotary transformer. This allows for accurate settings and improves performance by suppressing signal transmission loss.

<Prior Art> FIG. 2 is a sectional view of a conventional rotating magnetic head drum, and FIG. 3 is an enlarged view of the main parts of the rotating magnetic head drum.

Bearings 2 are fixed to the lower drum 1 at the top and bottom.

A disk 5 for holding the upper drum 4 is fixed to the shaft 3 by shrink fitting, and after being inserted into the upper and lower bearings, a preload collar 6 is applied to the bearings and fixed. The rotary transformer stator 7 is inserted into the lower drum 1 and its lower end surface is adhesively fixed. A magnetic head 8 is attached to the upper drum 4. The upper end surface of the rotary transformer rotor 9 is bonded to the disk 5 in a process before the shaft 3 is inserted into the bearing.

In addition, in FIG. 3, b represents the rotary transformer stator 7.
The installation of the rotary transformer rotor 9 shows a difference in height.

<Problems to be Solved by the Invention> When a rotary transformer rotor is attached to a hard-burned disk on the shaft and then inserted into a bearing fixed to the lower drum, the height of the inner ring of the bearing increases. Because the height of the disc varies depending on the accuracy of the bearing, the height of the disc that is set in contact with the upper part of the inner ring of the bearing and the height of the rotary transformer rotor that is bonded to the groove vary, and the positions of the coil grooves of the rotary transformer and stator vary. A problem has arisen in that the two do not face each other accurately.

Means for Solving the Problems> In order to solve the above problems, the present invention provides a rotating magneto-electric head drum in which a cylindrical rotary transformer stator and a rotary transformer rotor are disposed coaxially. It is installed in the vertical direction via an adjustment member whose position can be adjusted.

In other words, by adjusting the mounting position of the rotary transformer rotor, the coil grooves of the rotary transformer stator and the coil grooves of the rotary transformer rotor can be accurately opposed.

<Embodiment> FIG. 1 is a sectional view of a rotating magnetic head drum of the present invention.

Lower drum] Kfl bearings 2 are fixed at the top and bottom. A disk 1 is mounted on the shaft 3 to hold the upper drum 4.
After the bearings 2 are fixed by shrink fitting and inserted into the upper and lower bearings 2, a preload is applied to the bearings 2 by a preload collar 6 and the bearings 2 are fixed. The outer circumferential surface of the disk 12 is threaded, and a ring-shaped adjusting member 11 whose inner circumferential surface is threaded is screwed into the threaded portion. The upper end surface of the trans rotor io is fixed with adhesive. rotary transformer stator 7
Fi, is inserted into the lower drum I and the lower end surface is fixed with adhesive.

In order to accurately oppose the coil grooves of the rotary transformer stator 7 and the coil grooves of the rotary transformer rotor 1O, the adjusting member 11 is rotated to move the rotary transformer rotor 10 in the vertical direction. After making the appropriate adjustments, apply adhesive to the threaded portion to secure it.

In this way, the signal transmission loss in the rotary transformer can be reduced, so that the image quality can be improved.

<Effects of the Invention> As described above, according to the rotating magnetic head drum of the present invention,
The position of the opposing coil grooves between the rotor and stator of a rotary transformer can be precisely adjusted, reducing signal transmission loss and improving performance.

[Brief Description of the Drawings] Fig. 1 is a sectional view of the rotating magnetic head drum of the present invention, Fig. 2 is a sectional view of the rotating magnetic head drum of the present invention;
The figure is a cross-sectional view of a conventional rotary magnetic head drum, and FIG. 3 is an enlarged view of essential parts of the conventional rotary magnetic head drum. 1...Lower drum, 2...Bearing, 3.
...Shaft, 4...Upper drum, 6...Preload collar 7...Rotary transformer rotor
8... Go to video 7)", 10... Rotary transformer rotor 11... Adjustment member, 12... Disc. Agent Patent attorney Ume 1) Katsu (and 2 others) Review

Claims (1)

[Claims] 1. In a rotating magnetic head drum in which a cylindrical rotary transformer stator and a rotary transformer rotor are coaxially arranged, the rotary transformer is mounted via an adjustment member whose position can be adjusted in the vertical direction. A rotating magnetic head drum characterized by being attached to the drum. 2. The rotating magnetic head drum according to claim 1, wherein the adjusting member is ring-shaped and has a threaded inner circumferential surface, and is screwed into a disk having a threaded outer circumferential surface. 3. a lower drum, a circular rotary transformer whose lower end surface is adhesively fixed to the inner lower surface of the lower drum, a shaft rotatably fixed to the lower drum, and fixed to the shaft; a disk with a thread cut on its outer circumferential surface; an upper drum fixed to the disk; a ring-shaped adjustment member with a thread cut on its inner circumference and screwed into the disk; and a lower side of the adjustment member. A rotating magnetic head drum consisting of a cylindrical rotary transformer rotor whose upper end surface is adhesively fixed to the end surface.