JP2000011345A - Track height adjusting mechanism for video head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a track height adjusting mechanism for video head capable of unnecessitating the pairing and the ranking. SOLUTION: In this track height adjusting mechanism for video head with is provided with a head base 20 to be mounted on a rotating drum and a core chip 10 to be attached to the head base 20, a slit 25 is formed in parallel with the plane of the core chip 10 in the head base 20 and the width of the slit 25 is adjusted by deforming the head base 20 with a track height adjusting member 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a track height adjusting mechanism for a rotary drum type video head.

[0002]

2. Description of the Related Art A rotary drum type video head used in a video deck has a plurality of head assemblies mounted on a rotary drum on which a video tape slides. This head assembly is mounted on a support called a head base.
A core chip for recording / reproducing and erasing information is attached thereto.

FIG. 5 is an assembly view showing an example of a conventional head assembly. FIG. 1A is a front view showing the core chip 10 alone. In the core chip 10, a gap 11 is formed in the center of the front surface, and glass 12 is embedded at both ends of the gap 11, so that the effective width of the gap 11, that is, the track width is regulated. This core chip 10
Is attached to one surface 21 of the head base 20 to be integrated as shown in FIG.

When the chip 10 is attached to the base 20, the gap 21 between the one face 21 of the base 20 and the chip 10
The distance H0 from the lower end of 1 is one of the important factors of the video head called the track height. Since the track height H0 varies due to the slice dimensional accuracy and bonding accuracy of the chip 10, pairing and ranking are usually performed after measurement.

[0005]

As described above, the conventional technique of performing pairing and ranking increases the cost of a video head including this head assembly. This is a problem to be solved by the present invention.

SUMMARY OF THE INVENTION An object of the present invention is to provide a video head track height adjusting mechanism capable of eliminating the need for pairing and ranking by making the head height after chip attachment possible.

[0007]

An object of the present invention is to provide a head base attached to a rotary drum, a core chip attached to the head base, and a slit formed in the head base in parallel to the surface of the core chip. And a track height adjusting mechanism for adjusting the width of the slit by deforming the head base.

According to a preferred embodiment of the present invention, the track height adjusting member is realized by a screw screwed into the head base with the slit interposed therebetween, or a wedge inserted into an end of the slit. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. FIG. 1 and FIG.
FIG. 2 is a perspective view and a side sectional view showing a first embodiment of a track height adjusting mechanism of the video head according to the present invention. As shown in these figures, the head base 20 is formed with a hole 22 for inserting a screw to be attached to a rotating drum (not shown), and a printed circuit board 23 is arranged so as to avoid this hole 22. A chip mounting portion 24 is formed to protrude from the main body of the base 20. The chip 10 is attached to the lower surface 21 of the mounting section 24. This chip 10
Has a winding groove 13 in addition to the structure shown in FIG.
A winding wire (not shown) for recording / reproducing is formed in the winding wire groove 13, and an end lead thereof is connected to the printed circuit board 23.

[0010] The track height adjusting mechanism of the present invention is configured as follows. That is, in the main body of the base 20,
A slit 25 is formed parallel to the surface of the chip 10. A track height adjusting screw 31 is screwed into a portion sandwiching the slit 25. In this example, the screw 31 is mounted so as to enter from the upper surface of the base 20 toward the lower surface 21.

According to the track height adjusting mechanism having the above-described structure, after the chip 10 is attached to the lower surface 21 of the mounting portion 24, the screw 31 is rotated to thereby rotate the base 20 as shown by the arrow in FIG. The width of the slit 25 can be adjusted by vertically distorting the mounting portion 24 with respect to the main body. Therefore, the track height in a state where the base 20 is fixed to a fixed position of a rotating drum (not shown) can be adjusted on the base 20 side. In the present invention, the adjustment of the track height is performed before the base 20 is attached to the rotating drum.

FIG. 3 is a side sectional view showing a second embodiment of the track height adjusting mechanism of the video head according to the present invention. In this example, the track height adjusting screw 31 is
2 is mounted upside down to adjust the width of the slit 25, that is, the track height.

FIG. 4 is a side sectional view showing a third embodiment of the track height adjusting mechanism of the video head according to the present invention. In this example, a wedge 32 for adjusting the track height is inserted into the end of the slit 25 so as to adjust the width of the slit 25, that is, the track height.

In any of the embodiments described above, the track height can be adjusted by a simple operation. The present invention can also be applied to a double azimuth (4HD) type video head.

[0015]

As described above, according to the present invention, there is provided a track height adjusting mechanism for a video head which can adjust the track height after attaching a chip and can eliminate the need for pairing and ranking. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a track height adjusting mechanism of a video head according to the present invention.

FIG. 2 is a side sectional view of the track height adjusting mechanism of FIG.

FIG. 3 is a side sectional view showing a second embodiment of a track height adjusting mechanism of a video head according to the present invention.

FIG. 4 is a side sectional view showing a third embodiment of a track height adjusting mechanism of a video head according to the present invention.

FIG. 5 is an assembly view of a conventional head assembly.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Core chip 11 Gap 12 Glass 13 Winding groove 20 Head base 24 Chip mounting part 25 Slit 31 Screw for track height adjustment 32 Wedge for track height adjustment

Claims (3)

[Claims] A head base attached to a rotating drum; a core chip attached to the head base; a slit formed in the head base in parallel with a surface of the core chip; and a slit formed by deforming the head base. A track height adjusting mechanism for a video head, comprising: a track height adjusting member for adjusting a width. 2. The track height adjusting mechanism according to claim 1, wherein the track height adjusting member is a screw screwed into the head base with the slit interposed therebetween. 3. The track height adjusting mechanism according to claim 1, wherein the track height adjusting member is a wedge inserted into an end of the slit.