JPH035909A - Magnetic head height adjusting mechanism - Google Patents

Abstract

PURPOSE:To easily adjust height with high accuracy by providing the abutting part of a height adjusting screw to a head base in a position facing with a head chip to a fixed screw. CONSTITUTION:In the position facing with a head chip 3 to a fixed screw 6 of a head base 2, a height adjusting screw 5 is provided and a distance from the fixed screw 6 to an abutting part 5a of the height adjusting screw 5 is set larger than a distance from the fixed screw 6 to the head chip 3. Thus, the head base 2 is inclined with a fixed part 2a as a supporting point by the pressing operation of the height adjusting screw 5 and the height of the head chip 3, which is fixed to this head base 2, can be easily adjusted.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a magnetic head height adjustment mechanism used for recording and reproducing in video tape recorders and the like. [Prior art] Fig. 7 and Fig. 8 are shown in, for example, Japanese Patent Application Laid-Open No. 61-10571.
9 is a cross-sectional view and a plan view showing a conventional magnetic head height adjustment mechanism disclosed in Publication No. 9. FIG. In the figure, (1) is the magnetic head, (2) is the head base of the magnetic head (1),
(3) is a head chip fixed to this head base (2). (4) is a rotating drum, (5) is a height adjustment screw that is screwed onto the rotating drum (4) and contacts the head base (2) at the contact portion (5a), and (6) is the rotating drum (4). This is a fixing screw that is screwed together to fix the fixing part (2a) of the head base (2) to the rotating drum (4). Next, the operation will be explained. In this type of device, a magnetic tape (not shown) is wound around a rotating drum (4) at a predetermined angle, and this rotating drum (4) rotates at high speed. A pair of magnetic heads (1) mounted thereon obliquely scan the magnetic tape to perform magnetic recording and reproduction. The interval of this scanning locus, that is, the track pitch, is several 10
The relative height when attaching the pair of magnetic heads (1) to the rotating drum (4) requires precision in the μm range. For this reason, as shown in Figures 7 and 8, the height adjustment screw (5) is used to attach the magnetic head (1) to the magnetic head (1).
We have used a structure that adjusts the height of the That is, in the figure, after the fixing part (2a) of the head base (2) is fixed to the rotating drum (4) with the fixing screw (6), the head base ( 2), in FIG. 7, the height of the head chip (3) decreases by t. In Figure 7, the distance from the fixing screw (6) to the tip of the head tip (3) is I3, and the distance from the fixing screw (6) to the contact part (5a) of the height adjustment screw (5) is I.
22, for example, the height of the head chip (3) is h

[Effect] In the magnetic head height adjustment mechanism of the present invention, the head base (2) is tilted about the fixed part (2a) by the suppressing action of the height adjustment screw (5), and the head fixed to the head base (2) is tilted. The height of the chip (3) can be adjusted. [Embodiments of the invention]

FIGS. 1 and 2 show an embodiment of a magnetic head height adjustment mechanism according to the present invention. In the figure, (1) is the magnetic head, (2) is the head base of the magnetic head (1), and (3) is the magnetic head.
) is a head chip fixed to the end (2b) of this head base, (4) is a rotating tram, and (6) is a fixed part screwed to this rotating drum and located approximately in the center of the head base (2). Fixing screw (2a) that fixes part (2a) to the rotating drum
4a) is a protrusion formed on the rotating drum (4), which protrudes a small amount concentrically with the fixing screw (6). (5) is a height adjustment screw screwed onto the drum (4), and (5a) is a contact portion that comes into contact with the end (2c) of the head base (2). Further, (2d) is a U-shaped through hole formed in the head base (2), and this through hole (2d) has a shape that concentrically surrounds the fixing screw (6). In addition, the distance Q2 from the fixing screw (6) to the contact part (5a) of the height adjustment screw (5) is longer than the distance f21 from the fixing screw (6) to the tip of the head tip (3) in the figure. It is set large. Next, the operation will be explained. In the figure, the head base (
2) is fixed to the rotating drum (4) with a fixing screw (6) at a fixing part (2a). A U-shaped through hole (2d) is provided around the fixed part (2a), so the fixed part (2a) is
a) The bending rigidity is weak near the fixing part (2a
) is the fulcrum and the entire structure can be tilted. Therefore, by rotating the height adjustment screw (5), the pressing action at this contact portion (5a) is applied to the head base (2).
When the head base (2) is applied to the end (2C) of the head base (2), the head base (2) tilts at a slight angle clockwise in FIG. Here, if the dimension β2 is set larger than the dimension 3 in the figure, the amount of height movement of the head chip (3) will be the amount of movement of the height adjustment screw (5) βl/β2 (<
1). For example, set I21:β2=1+2 and M3×0
．． If height adjustment screw 5 is used, in order to move the height of the head chip (3) by 2 μm, the height adjustment screw (5) must be 0.002x2÷0.5X360=near,
It will rotate 88'. This is shown in Figures 7 and 8.
The amount of rotation is about four times that of the conventional example shown in the figure, and highly accurate height adjustment can be easily achieved. In the above embodiment, the bending rigidity near the fixing part (2a) was weakened by forming the O-shaped through hole (2d) around the fixing part (2a) of the head base (2). ,
Similar effects can be obtained using other structures. In Figures 3 and 4, (2) is the head base, (2)
a) shows two fixing parts protruding from both sides of the head base (2), and (2e) shows the head base (2).
2) and a narrow portion formed between the fixing portion (2a);
(4a) are two protrusions formed on the rotating drum (4), and the fixing part (2a) of the head base (2) is pressed against these protrusions (4a) by two fixing screws (6). . That is, the head base (2) has two fixing parts (2a).
It is possible to set the bending rigidity at the line connecting the two to be weak, and it is possible to incline while maintaining a state in which overall deformation does not occur much. Furthermore, in the embodiment shown in FIGS. 1 and 2, the protrusion (4a) is formed on the rotating drum (4) so as not to impede the tilting movement of the head base (2). , it is not necessarily necessary to form the protrusion (4a) on the rotating drum (4).This will be explained with reference to Figs. 5 and 6. In Fig. 5, (2) is the head base, and (2f) is the head base. With the protrusion provided on the head base (2), it is possible to obtain the effect that even if the protrusion is provided on the head base (2) side, the inclination of the head base (2) is not obstructed. , (2) is a head base, and (7) is a spacer interposed between this head base (2) and the rotating drum (4). It is clear that the same effect as in the illustrated embodiment can be obtained. [Effects of the Invention] As described above, according to the present invention, there is a height at a position facing the head chip with respect to the fixed portion of the head base. Since the adjustment screw is provided, there is an effect that highly accurate height adjustment of the head chip can be easily achieved.

[Brief explanation of drawings]

1 is a sectional view showing a magnetic head height adjustment mechanism according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a sectional view showing a magnetic head height adjustment mechanism according to another embodiment of the invention. 4 is a sectional view taken along the line TV-IV in FIG. 3; FIG. 5 is a sectional view showing a magnetic head height adjustment mechanism according to another embodiment of the present invention; FIG. 6 is a sectional view showing a magnetic head height adjustment mechanism showing still another embodiment of the present invention, FIG. 7 is a sectional view showing a conventional magnetic head height adjustment mechanism, and FIG. 8 is a plan view of FIG. 7. It is a diagram. In the figure, (1) is a magnetic head, (2) is a head base, (3) is a head chip, (4) is a rotating drum, and (5) is a head base.
) is the height adjustment screw, (5a) is the contact part of the height adjustment screw (5) to the head base (2), and (2d) is the O-shaped through hole formed in the head base (2). be. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) Magnetic head height consisting of a head base to which a head chip is fixed, a fixing screw that fixes this head base to a rotating drum, and a height adjusting screw that is screwed onto the rotating drum and presses the head base. A magnetic head height adjustment mechanism, characterized in that, in the height adjustment screw, a contact portion of the height adjustment screw to the head base is provided at a position facing the head chip with respect to the fixing screw.