JPH0528447A - Rotary head device - Google Patents

Abstract

PURPOSE:To easily and accurately perform the fine adjustment of a head height. CONSTITUTION:The base part of a head base 35 fixing a head 36 to its tip is outer peripheral face 30b of the rotating drum 30, and fixed by a screw 34. On the other hand, a metal plate 37 is fixed to the upper face 31b of the bottom part 31 of the rotating drum 30, and fixed by the screw 38, a vertical hole 31d is formed to a position opposed to the tip side of the head base 35 of the bottom part 31 of the rotating drum 30, a female screw hole 37a is formed at the position of the metal plate 37 opposing to this vertical hole 31b. A pairing adjusting screw 40 is screwed to this female screw hole 37, this pairing adjusting screw 40 is inserted in the vertical hole 31d of the bottom part 31 of the rotating drum 30 and the tip side of the head base 35 is pressurized by the tip 40a of the pairing adjusting screw 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical scan type rotary head drum device (rotary head device) in which the height of the head protruding from the outer peripheral surface of a rotary drum (rotating body) can be finely adjusted.

[0002]

2. Description of the Related Art For example, in a VTR (video tape recorder), a rotary drum (rotating body) having a head chip for recording a video signal is arranged at a slight inclination from the tape running direction, and is obliquely placed on the tape while being rotated. A helical scan type rotary head drum device (rotary head device) that records in a pattern of is used. This is shown in FIG.
More specifically, referring to FIG. 8, a base 104 of a head base 102 having a tip-shaped head 103 fixed to the tip of the upper drum (rotating body) 101 of the rotary head drum device 100 with an adhesive or the like is used as a set screw 104. It is fastened and fixed via. As a result, the head 103 projects a predetermined amount from the outer peripheral surface of the upper drum 101. Further, a pairing adjusting screw 105 is screwed onto the bottom of the upper drum 101 on the tip side of the head base 102 from above in the bottom.

Then, the pairing adjusting screw 105 is screwed into the female screw hole 101a formed in the bottom portion of the upper drum 101, so that the front end side of the head base 102 is pressed downward by the front end 105a thereof. 102
The head height is adjusted (pairing adjustment) by bending the tip side of the head downward from the set screw 104.

[0004]

In the conventional rotary head drum device 100, the head base 102 is pushed by the pairing adjusting screw 105.
02 was elastically deformed downward to perform pairing adjustment, but since the amount of pressing the head base 102 by rotating the pairing adjustment screw 105 is determined by the pitch of the pairing adjustment screw 105, the pairing adjustment screw 105 The amount of elastic deformation of the head base 102 becomes very large with respect to the rotation angle of, and it is difficult to finely adjust the head height.

Therefore, the present invention provides a rotary head device capable of easily and accurately performing fine adjustment of the head height.

[0006]

[Means for Solving the Problems] On one surface side of the rotating body,
The base side of the head base with the head fixed to the tip is fastened with a set screw so that the head protrudes from the outer peripheral surface of the rotating body by a predetermined amount, and the plate material is fastened to the other surface side of the rotating body with the set screw. Fix, form a hole at a position facing the tip side of the head base of the rotating body, form a female screw hole at a position of the plate material facing the hole, and a pairing adjustment screw in the female screw hole. The pairing adjusting screw is screwed and inserted into the hole of the rotating body so that the tip side of the head base can be pressed by the tip of the pairing adjusting screw. Further, the rigidity of the plate material is lower than the rigidity of the head base.

[0007]

When the pairing adjusting screw is screwed into the female screw hole of the plate member, both the head base and the plate member are elastically deformed and bent in the directions away from each other. Since the amount of deflection of the plate material reduces the amount of displacement of the head base relative to the amount of displacement of the pairing adjustment screw, fine adjustment of the head height can be easily and accurately performed.

[0008]

Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a helical scan type rotary head drum device (rotary head device), which is used for a magnetic recording / reproducing VTR. This rotary head drum device 1 includes a fixed drum (lower drum) 1
0 and a set screw 19 on the bottom portion 10a of the fixed drum 10.
The motor 20 fastened and fixed via the
The rotary drum 21 is fixed to the upper end portion 21a of the rotary shaft 21 and is substantially constituted by a rotary drum (rotating body) 30 as an upper drum facing the fixed drum 10 with a predetermined clearance.

The fixed drum 10 is formed in a bottomed and double cylindrical shape, and the outer peripheral surface 10c of the outer cylindrical portion 10b thereof.
Tape lead part 1 for guiding a magnetic tape (not shown) to the
0d is formed. In addition, a pair of ball bearings 11 and 12 are provided inside the cylindrical portion 10e inside the fixed drum 10.
The rotary shaft 21 of the motor 20 is rotatably supported via the. Further, a rotary transformer 52 on the stator side is fixed to the upper surface of the bottom portion 10a of the fixed drum 10, and the lower surface of the bottom portion 10a is provided with a set screw 13 and a terminal 14 for a rotary transformer signal line. Printed circuit board 1
5 is fixed.

The motor 20 includes a rotor 22 fixed to a lower portion of a rotary shaft 21 and a bottom portion 10 of the fixed drum 10.
It is composed of a stator 25 fixed to the inner peripheral surface of a cylindrical stator case 26 fastened and fixed to a and facing the rotor 22 with a predetermined clearance. The rotor 22 includes a dish-shaped rotor case 23 and an annular plate-shaped magnet 24 fixed to the upper surface of the rotor case 23. The stator 25 includes the stator case 26, a disc-shaped stator substrate 27 fixed in the stator case 26, and the stator substrate 27.
The back yoke 29 includes a plurality of phase coils 28 attached to the lower surface of the magnet 24 and facing the magnet 24 with a predetermined clearance.

The rotating drum 30 is formed in a bottomed cylindrical shape with a central portion 30a protruding upward, and the central portion 3
0a is attached to the upper portion of the rotary shaft 21 of the motor 20 by pressing into a substantially cylindrical flange 32, and a pair of setscrews 33, 3 are attached.
By being fastened and fixed via 3, the rotary shaft 21 is rotated. Further, on the lower surface (one surface) 31a of the bottom portion 31 of the rotary drum 30, three head bases 35 are provided at intervals of 90 ° via each set screw 34.
The base portions 35a of the above are fastened and fixed. A chip-shaped head 36 is fixed to the upper surface of each head base 35 on the tip end 35b side with an adhesive or the like. Each head 36
Are housed in the respective opening recesses 31c formed in the bottom portion 31 of the rotary drum 30 and project from the outer peripheral surface 30b of the rotary drum 30 by a predetermined amount. Further, a vertical hole 31d penetrating the upper and lower surfaces 31b and 31a is formed at the position of the bottom portion 31 of the rotary drum 30 facing the tip side of each head base 35.

Further, as shown in FIGS. 1 and 2, a sheet metal (plate material) 37 is fastened and fixed by a set screw 38 to the upper surface (the other surface) 31b of the bottom portion 31 of the rotary drum 30. A printed circuit board 39 for wiring connection is integrally formed on the sheet metal 37 by adhesion. The sheet metal 37 is formed in an annular plate shape slightly smaller than the upper surface 31b of the bottom portion 31, and female screw holes 37a are formed in the bottom portion 31 at positions facing the vertical holes 31d. Each push screw (pairing adjustment screw) 40 is provided in each female screw hole 37a.
Are screwed together. The outer diameter of each push screw 40 is formed to be smaller than each vertical hole 31d of the bottom portion 31, and each tip 40a pushes the tip 35b side of each base head 35 downward to adjust the head height ( (Pairing adjustment)
It is free. Further, as shown in FIG. 2, substantially U-shaped notches 39a are formed in the vicinity of the push screws 40 of the printed circuit board 39, respectively. The printed board 39 and the rotor-side rotary transformer 51 fixed to the lower surface of the flange 32 are connected via a terminal 55,
The printed circuit board 39 and the head 36 on the head base 35 are electrically connected by wiring not shown. The rotary transformer 50 is composed of the rotor-side transformer 51 and the stator-side transformer 52.

According to the rotary head drum device 1 of the above embodiment, as a position adjusting procedure of the head 36 in which the tip of the rotary drum 30 protrudes from the outer peripheral surface 30b by a predetermined amount, first of all, the angle division of the head 36 and the R balance / attachment are performed. Adjust the amount of protrusion and set each head base 35 to the rotary drum 3 with each set screw 34.
It is fastened and fixed to the lower surface 31a of the bottom portion 31 of 0. Then, adjust the head height. This pairing adjustment is performed by screwing each push screw 40 clockwise.
Each push screw 40 is screwed into each female screw hole 37a of the sheet metal 37, and the push screw 40 is lowered with respect to the female screw hole 37a by the above-mentioned screwing, and the tip 40a of the push screw 40 is located on the tip 35b side of the head base 35. However, at the same time, the sheet metal 37 is also bent upward and lifted. That is, as the head base 35 is elastically deformed downward, the sheet metal 37 and the printed circuit board 39 are also elastically deformed and flexed upward, and the distance between them expands (both move away from the bottom 31 of the rotary drum 30). . Therefore, in the related art, the distance obtained by rotating and lowering the pairing adjusting screw appears as the amount of displacement in the height direction of the head base as it is, but in the above-described embodiment, it is pushed down by the amount of bending that occurs in the sheet metal 37. Since the displacement amount of the head base 35 is smaller than the displacement amount of each push screw 40, a smaller displacement amount can be obtained with the same rotation angle of the push screw 40, and fine adjustment of the head height is easy. And it can be done accurately.

As described above, in order to perform the pairing adjustment of the head 36 fixed to the tip 35a side of the head base 35 with high accuracy, as described above, the head base 35 with respect to the pressing amount of the push screw 40 is pressed. Although the displacement amount may be reduced, the displacement amount of the head base 35 with respect to the same rotation angle of the push screw 40 may be reduced as the rigidity of the sheet metal 37 is lower than the bending rigidity of the head base 35. it can. For example, the rigidity of the head base 35 is 1
Then, if the rigidity of the sheet metal 37 is set to 1/10, the pushing amount of the push screw 40 is 1/11 of the conventional one.
It is possible to perform highly accurate pairing adjustment.

Further, since the printed circuit board 39 for connecting the head 36 and the rotary rotor 51 is fixed and integrated on the sheet metal 37, the space space on the upper surface 31b of the bottom 31 of the rotary drum 30 is effectively used. Available. Further, as shown in FIGS. 1 and 2, since the head of each push screw 40 is exposed on the rotary drum 30, the pairing adjustment can be easily performed in the completed state of the rotary head drum device 1. . Furthermore, it is possible to reduce the amount of change in the height position of the head 36 due to the loosening of each push screw 40 over time.

3 and 4 show another embodiment. In the other embodiment, the plate thickness of the sheet metal 37 'is made thicker and the width thereof is made narrower than that of the above-mentioned embodiment, and the pair of setscrews 38, 38 are used to form the central portion 30a of the upper surface 31b of the bottom portion 31 of the rotary drum 30. It is fastened and fixed around. The rigidity of the sheet metal 37 'is set to be lower than the rigidity of the head base 35, and the other configurations are the same as those of the above-described embodiment, and therefore, the same reference numerals are given and detailed description thereof will be omitted. As a result, when each of the push screws 40 is rotated, both the head base 35 and the sheet metal 37 'are elastically deformed in the directions away from each other and the same effect as that of the above-described embodiment is obtained. Push screw 40
It is possible to easily obtain a slight amount of deformation of the head base 35 at a large rotation angle.

5 and 6 show another embodiment. In this another embodiment, each sheet metal 37 ″ is formed into a short link plate shape, and each sheet metal 37 is formed by a set screw 34 for fastening and fixing each head base 35 to the lower surface 31a of the bottom 31 of the rotary drum 30. ″ Is also fastened. The other components are the same as those of the above-described embodiment, such as the rigidity of each of the metal plates 37 ″ is lower than the rigidity of the head base 35, and thus the same reference numerals are given and detailed description thereof will be omitted. When the push screws 40 are rotated, the head base 35 and the sheet metal 3 are rotated.
Both 7 ″ are elastically deformed in the direction away from each other, and the same effect as the above-described embodiment is obtained.

According to each of the above-mentioned embodiments, the rotary head device using the upper drum as the rotating body which rotates with respect to the lower fixed drum has been described, but a so-called propeller type rotating body using a disk as the rotating body is described. It may be applied to a head device.

[0020]

As described above, according to the rotary head device of the present invention, the head is fixed to the base side of the head base with the head fixed to the one surface side of the rotary body from the outer peripheral surface of the rotary body. Fasten and fix with a set screw so that it protrudes by a predetermined amount, and fasten and fix a plate material on the other surface side of the rotating body with a set screw to form a hole at a position facing the tip side of the head base of the rotating body. Then, a female screw hole is formed at a position of the plate member facing the hole, a pairing adjustment screw is screwed into the female screw hole, and the pairing adjustment screw is inserted into the hole of the rotating body to insert the head into the head. Since the tip side of the base is configured to be freely pressed by the tip of the pairing adjustment screw, the pairing adjustment screw is screwed into the female screw hole of the plate member, so that both the head base and the plate member are separated from each other. To that Since the amount of head base displacement can be reduced relative to the amount of displacement of the pairing adjustment screw by the amount of the elastically deforming and deflecting that occurs in the plate material, it is possible to easily and accurately perform fine adjustment of the head height. You can

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary head drum device showing an embodiment of the present invention.

FIG. 2 is a plan view of the rotary head drum device.

FIG. 3 is a sectional view of a rotary head drum device according to another embodiment on the rotary drum side.

FIG. 4 is a plan view of a rotary head drum device according to another embodiment.

FIG. 5 is a sectional view of a rotary head drum device according to another embodiment on a rotary drum side.

FIG. 6 is a plan view of a rotary head drum device according to another embodiment.

FIG. 7 is a sectional view of a main part of a conventional rotary head drum device on a rotary drum side.

FIG. 8 is a bottom view of the conventional rotary head drum device on the rotary drum side.

[Explanation of symbols]

1 ... Rotary head drum device (rotary head device), 30 ...
Rotating drum (rotating body), 30a ... Outer peripheral surface, 31a ... Lower surface (one surface), 31b ... Upper surface (other surface), 31d ...
Hole, 34 ... Set screw, 35 ... Head base, 35a ... Base part, 35b ... Tip, 36 ... Head, 37 ... Sheet metal (plate material), 37a ... Female screw hole, 38 ... Set screw, 40 ... Push screw (pairing adjustment) Screw), 40a ... tip.

Claims (2)

[Claims] 1. A base side of a head base having a head fixed to a tip thereof is fastened and fixed to one surface side of a rotating body by a set screw so that the head protrudes from an outer peripheral surface of the rotating body by a predetermined amount. A plate material is fastened and fixed to the other surface side of the rotating body with a screw, a hole is formed at a position facing the tip side of the head base of the rotating body, and a female screw hole is provided at a position of the plate material facing the hole. A pairing adjustment screw is screwed into this female screw hole, the pairing adjustment screw is inserted into the hole of the rotating body, and the tip side of the head base can be pressed by the tip of the pairing adjustment screw. A rotary head device characterized in that 2. The rotary head device according to claim 1, wherein the rigidity of the plate member is lower than the rigidity of the head base.