JPH0440617A - Rotary head device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head device that allows fine adjustment of pairing.

[Summary of the Invention] This invention provides a method for fixing the other end side of a head base having a head fixed to one end to a rotating body so that the head protrudes a predetermined amount from the outer peripheral surface of the rotating body, and fixing one end of the head base In a rotating head device in which pairing can be adjusted freely by pressing the side with the tip of a pairing adjustment screw screwed onto the rotating body, the wall thickness of the portion of the rotating body where the pairing adjustment screw is screwed is set. By forming it thinner than other parts, fine adjustment of pairing can be performed easily and with high precision.

[Prior Art] For example, a VTR uses a helical scan method in which a rotating body having a video head for recording video signals is placed slightly tilted from the tape running direction, and records an oblique pattern on the tape while rotating. Rotating head devices are commonly used. To explain this in detail with reference to FIGS. 6 and 7, the upper drum (rotating body) 2 of the rotating head device 20
A head base 22 having a chip-shaped head 23 fixed to one end with an adhesive or the like is fixed to the bottom of the head base 1 through a screw 24 at the other end. Thereby, the head 23 protrudes from the outer peripheral surface of the upper drum 21 by a predetermined amount.

Further, on one end side of the head base 22, a pairing adjustment screw 2 is attached to the bottom of the upper drum 21 from above in the bottom.
5 are screwed together. And the pairing adjustment screw 25
By screwing in, the tip presses one end of the head base 22 downward, and the head base 22 is bent downward from the screw 24 to adjust the pairing.

[Problems to be Solved by the Invention] In recent years, there has been a demand for narrower tracks as recording density has improved. Since only the head base 22 elastically deforms with respect to the rotation angle) and the amount of movement of the head 23 is large, fine adjustment of pairing is difficult.

Therefore, the present invention provides a rotary head device that can facilitate fine adjustment of pairing and improve accuracy.

[Means for Solving the Problems] The other end of a head base having a head fixed to one end is fixed to a rotating body so that the head protrudes a predetermined amount from the outer peripheral surface of the rotating body, while one end of the head base In a rotating head device in which pairing can be adjusted freely by pressing the side with the tip of a pairing adjustment screw screwed onto the rotating body,
A portion of the rotating body into which the pairing adjustment screw is screwed is thinner than other portions.

[Function] A pairing adjustment screw is screwed into the thin part of the rotating body, and when the head base of the pairing adjustment screw is pressed, both the thin part and the head base are elastically deformed, and the threading amount of the pairing adjustment screw ( Since the amount of vertical movement of the head relative to the rotation angle (rotation angle) is smaller than before, fine adjustment of pairing can be performed easily and with high precision.

[Example] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In Figure 1.2, 1 is a so-called propeller-type rotating head device used in VTRs, and upper and lower fixed drums 2
．． 3, and a rotating disk (rotating body) 4 rotatably disposed between upper and lower fixed drums 2 and 3. A protrusion 4 is formed on the periphery (one end) of the rotating disk 4.
A is integrally extruded. The protrusion 4a is formed in a thinner part than the main body of the rotating disk 40, and
The rigidity is approximately the same as that of the head base 5, which will be described later. Immediately below the proximal end side of the protrusion 48 on the bottom peripheral edge of the rotating disk 4, a substantially rectangular plate-shaped helad base 5 having a chip-shaped head 6 fixed to one end with adhesive or the like is placed on the other end side of the head. 6 are fixed by set screws 7 so as to protrude by a predetermined amount from the outer peripheral surfaces of the upper and lower fixed drums 2.3. A pairing adjustment screw 8 is screwed onto the tip side of the protrusion 4a from above. The tip 8a of the pairing adjustment screw 8 presses against the upper surface of the head base 5 by screwing the pairing adjustment screw 8 into the head base 5.
The pairing can be finely adjusted by bending it downward.

According to the rotary head device 1 of the embodiment described above, fine adjustment of the pairing of the heads 6 is performed by screwing the pairing adjustment screw 8 screwed into the protrusion 4a of the rotary disk 4. FIG. 3 shows the state before fine adjustment of pairing. When the pairing adjustment screw 8 is screwed in from this state, in the conventional case, only the head base is elastically deformed, but as shown in FIG. Since the head 6 is elastically deformed and bent upward from point 7, the amount of downward movement of the head 6 is small and insensitive to the screwing amount of the pairing adjustment screw 8, making it easy to make fine adjustments to the pairing. It is possible to do this with high accuracy.

Although the above embodiment has been described with reference to the propeller-type rotary head device 1, the present invention is not limited to this, and as shown in FIG. The present invention can also be applied to a rotary head device 1' having an upper drum (rotating body) 4'.

In this case, a concave cutout 4 is provided at the bottom of the upper drum 4'.
b, and the thickness of the protrusion (thin walled portion) 4a' formed by the notch 4b is thinner than the thickness of the bottom of the other portion of the upper drum 4'.

The other end of the head base 5, to which the head 6 is fixed at one end, is fixed to the protrusion 4a/ with a set screw 7 in the same way as in the embodiment described above, thereby achieving the same effect as in the embodiment described above. ing. Since the other configurations are the same as those in the previous embodiment, the same reference numerals are given and the explanation will be omitted.

[Effects of the Invention] As described above, according to the present invention, the pairing adjustment screw is screwed into the thin wall portion of the rotary drum main body, and when the head base is pressed by the screwing of the pairing adjustment screw, the thin wall portion is connected to the thin wall portion. Since both the rad bases are elastically deformed and bent, and the amount of movement of the head relative to the screwing amount of the pairing adjustment screw is smaller than that of the conventional type, fine adjustment of pairing can be easily and highly accurately performed.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a rotary head device showing an embodiment of the present invention, Fig. 2 is a bottom view of the same device, Fig. 3 is a sectional view of the main part of the same device before fine adjustment of pairing, and Fig. 4 5 is a bottom view of another embodiment, FIG. 6 is a sectional view of the conventional example, and FIG. 7 is a bottom view of the conventional example. 1.1'... Rotating head device, 4... Rotating disk (rotating body), 4'... Upper drum (rotating body), 4a. 4a'...Protrusion (thin wall part), 5...Head base, 6...Head, 8...Pairing adjustment screw, 8a
...Tip. Cross-sectional view of the conventional example Fig. 6 Fig. 1 S) l Fig. 2 Fig. 7

Claims (1)

[Claims] (1) The other end of the head base with a head fixed to one end is fixed to a rotating body so that the head protrudes a predetermined amount from the outer peripheral surface of the rotating body, and one end of the head base is fixed to the rotating body. In a rotary head device in which pairing can be adjusted freely by pressing with the tips of screwed pairing adjustment screws, the wall thickness of the portion of the rotating body to which the pairing adjustment screw is screwed is made thinner than other portions. A rotating head device characterized in that: