JPH02246010A - Structure for adjusting head height of rotary head drum - Google Patents

Abstract

PURPOSE:To adjust the height of a head without moving the position of the circular arc shape apex of a head sliding plane by providing an aperture hole part at a head mounting plate between a head mounting plate connecting screw and a head height adjusting screw, and suppressing the inclination of a head chip. CONSTITUTION:It is necessary to perform the positioning of the height of the head tracking position of the head chip to accurately perform reproduction from a track positioned by the head chips 3 and 3'. Adjustment for the head tracking height of confronted head chips 3 and 3' is performed by performing the deflective displacement of the head mounting plate 4 by the head height adjusting screw 6. A head mounting plate aperture hole part 4a is provided at the member of the head mounting plate 4, and a mounting member 4d on a rotary head drum 1 is separated from the head mounting member 4E of the head chip 3, and they are coupled with the member coupling part 4C that is part of the head mounting plate 4 to comprise integral structure. Thereby, it is possible to perform height adjustment as keeping the position of the apex of the circular arc of the head sliding plane before adjusting, and to reduce dispersion in quality in mass production due to the dispersion in the height adjustment when the head is mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure of a video head height adjustment mechanism for a one-rotation magnetic head drum.

[Conventional technology]

Conventional equipment is based on the National Technical Report (NAT)
IONAL, TECHNICAL, REPORT,
)VOL, 25.

No1. FEB, 1976, p. 51, Fig. 9, [Planar facing type DD cylinder structure], the video head mounting plate is screwed to the rotating head drum from the fixed drum side, and the video head is connected to the rotating shaft via the rotating shaft. The relative height between the video heads installed in 1800 symmetrical positions and the absolute height of each video head from the tape guide surface of the fixed drum are higher than the video head fastening screws and the outer peripheral surface of the rotating head drum. Located in It was a structure in which height positioning was performed by bending and deforming the video head mounting plate by tightening or loosening the head height adjustment screw.

[Problem to be solved by the invention]

The above-mentioned conventional technology uses the head mounting plate fastening screw as a fulcrum, and adjusts the head mounting plate by applying flexural deformation from the rotating head drum to the fixed drum side using the height adjustment screw (No. 4).
(See figure), the tape sliding surface of the head chip protrudes from the tape running surface of the rotating head drum and the fixed drum tape running surface.

No consideration was given to the fact that the video head mounting plate tilts toward the fixed drum at an angle corresponding to the amount of flexural angular displacement, and as a result, when the head mounting plate is flexibly deformed and the height is adjusted, the head chip tape slides. The position of the apex of the circular arc from the rotating head drum tape running surface to the fixed drum tape running surface.

The rotating head moves toward the drum side with respect to the tape running surface of the rotating head drum and the fixed head drum, resulting in a minute spacing between the tape and the head to obtain sufficient contact between the tape and the sliding surface of the head. There was a problem in that the recording and playback output of the head deteriorated.

The present invention is the cause of the above problem.

The purpose of the present invention is to provide a structure for a head height adjustment mechanism that allows head height adjustment without causing any movement of the apex of the arc-shaped head sliding surface. shall be.

[Means to solve the problem]

In order to achieve the above purpose, an opening is provided in the head mounting plate between the head mounting plate fastening screw 5 and the head height adjustment screw 6 to suppress the inclination of the head chip and ensure that the apex of the arc of the head sliding surface is at a high height. No longer affected by height adjustment using the height adjustment screw.

In addition, in order to allow the head chip to be displaced without twisting, a head plate bending groove for adjustment is provided on the head chip mounting surface. Similarly, a bending groove was provided on the back of the head chip mounting surface (to serve as a fulcrum when bending).

[For production]

According to the present invention, the opening between the magnetic head mounting plate mounting screw and the head height adjustment screw acts to separate the head mounting plate members of the head mounting plate mounting portion and the head chip mounting portion. Therefore, if there is no opening in the original case, the head mounting plate is bent when the height is adjusted by tightening the height adjustment screw, and as a result, the tip of the head tip becomes the rotary head drum tape running part.

However, if there is an aperture, the attachment member of the head mounting plate to the rotating head drum and the head chip attachment member of the head mounting plate will be separated, even if the height Well, even if you tighten the adjustment screw and make adjustments.

Only the member connecting portion that connects each member is subjected to deformation bending, and the head chip mounting member.

There is no bending, and as a result, the arc of the head chip in contact with the tape can be adjusted while maintaining the apex position before height adjustment of the head.

Therefore, the apex of the arc of the sliding surface of the head is relative to the rotating head drum and fixed drum tape running surface.

The height adjustment does not change and variations due to the amount of adjustment are suppressed, and as a result, quality deterioration due to contact between the tape and head sliding surface, as well as quality production variations, are eliminated, and the head output for recording and playback is stable. It has the effect of

Further, the head mounting mechanism on the head chip mounting surface side concentrates on the groove position of the flexible member coupling portion when adjusting the height of the head chip mounting member, and the bending position is determined.

It acts as a fulcrum, so to speak. As a result, torsion and distortion between the head mounting member of the head mounting plate and the head mounting plate mounting member are eliminated, and there is an effect that the accuracy of the head azimuth angle etc. inherent to the head chip is not affected in any way.

Further, the groove provided on the back surface of the head chip mounting surface similarly functions as a fulcrum, and has the effect of preventing deviations in the head chip azimuth angle.

〔Example〕

Below, one embodiment of the present invention will be explained with reference to FIGS. 1 to 3. The configuration of a zero-rotation magnetic head drum is as shown in FIG. 5 is attached to the rotating head drum 1. There is another head chip 3' on the side opposite the head chip 3 by 180 degrees from the center of the rotation axis, and each pair of heads performs recording and playback to generate signals that make up one television screen. is being recorded and played back.

At this time, in order to accurately reproduce the recording track where the head chip S and head chip 3' are positioned from the tape, each head chip, more precisely, the head It is necessary to determine the height of the head track position of the chip. The head track height of these opposing head chips 3 and 31 is:

As shown in FIG. 4, the head mounting plate 4 is deflected and displaced by the head height adjustment screw 6. However, when the head mounting plate 4 is deflected and displaced by tightening the height adjustment screw 6 of the head mounting plate, 5 As shown in figure 5, tighten the head mounting screw 5.
As a result, the head chip 3 tilts toward the fixed drum 2 with the fulcrum being the fulcrum. For this reason, the apex of the arc of the head sliding surface 3a, which is the sliding portion at the tip of the head chip 3, is located at the tape running surface 1a.
and the fixed drum tape running surface 2a as a reference, the inclination angle α
This results in a relative shift to the example of the rotary head 1.

In order to solve this problem, the present invention provides a member of the head mounting plate 4 with a head mounting plate opening 4a as shown in FIG. The attachment member 4E was separated. Further, in order to form an integral structure, the respective members are connected by a part of the member connecting portion 4c of the head mounting plate 4, as shown in FIG. 2, which is a perspective view of arrow A in FIG. .

Further, in the present invention, the head chip 3 is connected to the rotating head drum 1.
Although the head mounting plate groove 4b is provided to act as a fulcrum to prevent twisting and distortion in the head azimuth angular direction with respect to the rotational direction of the head, it is expected that this will affect the head mounting member 4E. This is not necessarily necessary if sufficient strength against twisting and stress of the so-called twisted portion (portion B) can be ensured.

A head terminal plate for processing the winding ends of the head chip 3 is also attached to the head mounting member 4E of the head mounting plate 4, but if the amount of displacement (height adjustment amount) of the head chip 3 is minute, the head It may be attached to the attachment member 4d side of the attachment plate 4.

Also, as shown in Figures 6 and 7, it is possible to create a structure with the same purpose even when the head mounting plate 4 is a composite head mounting plate or when the head mounting plate 4 has two mounting screws 5. It is.

Further, as shown in Fig. 8, the apex position of the arc of the spacing slide surface 3a is further adjusted using two adjustment screws 6a and 6b, and the apex position of the arc is adjusted to the optimum point of the track center position. It is also possible to do so.

〔Effect of the invention〕

In the present invention, as described above, by providing the opening 4a in the integrally structured head mounting plate 4, the height of the head chip 3 can be adjusted to maintain the apex position of the arc of the head sliding surface 3a before adjustment. However, it is possible to provide a height-adjustable structure. As a result, it is possible to reduce variations in mass production quality due to variations in the amount of height adjustment when heads with various height distributions are attached. ``This is a much more effective means for a multi-head rotary drum having four or six pairs of heads than for a rotary drum having two pairs of heads facing each other by 180''.

In addition, in the conventional technology, the variation in the height adjustment amount is
Measure the head track height from the rotating head drum mounting surface of the head mounting plate, select one combination of spacers corresponding to that height, interpose them on the rotating head drum and head mounting plate mounting surface, and measure the amount of variation. Measures have been used to reduce the
Moreover, the complexity of height measurement and spacer selection reduces the economic efficiency of incorporating the rotating head drum. In this respect as well, the present invention can handle the height adjustment of the head track, which is a series of operations essential to installing the rotating head drum, as well as the installation, selection, and combination of spacers. There is no need to do this, the structure is simplified, and it is also effective in terms of economy.

Further, in the head height adjustment mechanism and structure according to claim 4,
Furthermore, it is possible to arbitrarily adjust the apex position of the arc of the head sliding surface, which was completely impossible with the prior art. As a result, the claimed invention not only maintains the apex position of the arc of the head sliding surface before adjustment and adjusts the height, but also allows for variations in the arc shape of the head sliding surface of the head itself in the pre-adjustment stage. This has the effect of stabilizing the output performance due to more subtle contact between the magnetic tape and the head sliding surface.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view showing an embodiment of the present invention.
FIG. 3 is a sectional view of the entire magnetic head drum using the present invention, FIG. 4 is a sectional view showing the prior art, and No. 51 is a head chip portion of the prior art. An enlarged sectional view, FIG. 6 is a perspective view of an embodiment of the invention in a composite head, FIG. 7 is a perspective view of an embodiment of the invention in a head having two head mounting screws, and FIG. FIG. 3 is a cross-sectional view of a structure with two adjustment screws; 4... Head mounting plate, 5... Head mounting screw, 6...
...Head height adjustment screw, 7...Head terminal board.

Claims (1)

[Claims] 1. A head height adjustment mechanism characterized in that a head mounting plate of a rotating magnetic head drum has an opening between a magnetic head mounting plate mounting screw and the head height adjustment screw. Structure. 2. A head height adjustment mechanism structure having a bending groove for height adjustment on the head chip mounting surface side of the magnetic head mounting plate. 3. The head height adjustment mechanism structure according to claim 1 or 2, further comprising a bending groove for height adjustment on the back surface of the head chip mounting surface. 4. In the head height adjustment mechanism having the features of claim 1, a head height adjustment structure having a screw for adjusting the apex of the arc of the head sliding surface between the height adjustment screw and the head mounting screw.