JPS6323786Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary head device used in video tape recorders and the like.

BACKGROUND TECHNOLOGY AND PROBLEMS Generally, as shown in FIGS. 1 and 2, a rotating head device of a video tape recorder (hereinafter referred to as VTR) has a disc-shaped rotary drum 1 near the circumference of the lower surface at the tip of a head substrate 2a. Two magnetic head devices 2, 2 each having a head chip 2b mounted thereon are fixed at an angular interval of 180 degrees. In this case, it is necessary to accurately divide the angle of the two magnetic head devices 2, 2 in order to ensure compatibility in recording patterns. Therefore, conventionally, as shown in FIGS. 1 and 2, the head board 2a is fixed to the rotating drum 1 with screws through a hole provided in the approximate center of the head board 2a, and the head board 2a is fixed to the rotary drum 1 with screws on both sides of the head board 2a. A tapered screw 3 is provided so that its tapered portion abuts the side of the head substrate 2a, and the angular direction of the head gap position of the magnetic head devices 2 is adjusted depending on how the taper screw 3 is screwed in.

Nowadays, high image quality and high precision are required in VTRs, and by recording and reproducing the entire video band with one magnetic head, the magnetic head is divided according to the band used, for example, the color signal band and the luminance signal band. It has been considered to provide a dedicated magnetic head for each, or to further divide the color signal band into red, green, and blue signals, and provide a magnetic head for each. When the magnetic heads are divided according to the band to be used in this way, it is possible to select the optimum head specification depending on the band to be used, and accordingly, higher image quality and precision can be obtained.

For this purpose, one head substrate 4a as shown in FIG.
Divide one side into three pieces by inserting two slots 4b and 4c of a predetermined length from the tip, and glue head chips 5a, 5b and 5c to the tips of these three divided parts 4d, 4e and 4f, respectively. A fixed magnetic head device 4 has been proposed. When the magnetic head device 4 having three head chips 5a, 5b and 5c as shown in FIG. 3 is attached to the rotating drum 1 as shown in FIG.
The angular direction of one of the head tips a, 5b, and 5c can be adjusted using the tapered screw 3, but the angular direction cannot be adjusted for the other two head tips. In this case, head chips 5a, 5
Divided parts 4d, 4e of the head board 4a of b, 5c,
When fixing with adhesive to 4f, the same head chips 5a, 5b
It is conceivable to make the spacing between the heads and 5c constant, but the angle accuracy required between these heads is within several tens of microns, and it is impossible to require adhesion accuracy. Also, in this case, each divided portion 4d, 4e, 4
It is also possible to insert taper screws with taps into the slots 4b and 4c between f to adjust the angle in the direction of widening the head spacing, but in this case, the height direction of the magnetic head (track width direction) The dimensions from the reference plane are also regulated, and when adjusting using this taper screw, force is also applied in the height direction, which has the drawback that the height of the head also changes.

Purpose of the invention In view of this, the present invention divides one side of one head board into multiple parts by slotting from the tip.
It is an object of the present invention to provide a rotary head device having a head device in which a head chip is adhesively fixed to the tip of each of the plurality of divided portions, and to be able to satisfactorily adjust the angle between each head chip.

Summary of the invention The present invention is a rotating head device having a head device in which one side of a head board is divided into a plurality of parts by slotting from the tip thereof, and a head chip is adhesively fixed to the tip of each of the divided parts. An eccentric pin or an eccentric cam is provided in a direction parallel to the side surface of the head board, and by rotating this eccentric pin or eccentric cam, the angle is adjusted so that the head chip moves in the angular direction. The angle adjustment between each head chip can be performed satisfactorily.

Embodiment An embodiment of the rotary head device of the present invention will be described below with reference to FIGS. 4 to 7. In FIGS. 4 to 7, parts corresponding to those in FIGS. 1 to 3 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In this example, one side of one head board 4a as shown in FIG. 3 is divided into two slots 4 from its tip.
The head device 4 is divided into three parts by inserting the parts b and 4c into it, and head chips 5a, 5b, and 5c are adhesively fixed to the tips of the three divided parts 4d, 4e, and 4f.
As shown in FIG. 1, the two are fixed to the rotary drum 1 while being spaced apart by 180 degrees and positioned at predetermined positions near the outer periphery of the lower surface of the rotary drum 1 with screws 6 via spacers.

In this example, a fixed plate 8 is provided with eccentric pins 7a and 7b in advance on the lower surface of the head board 4a.
is fixed with two screws 9a and 9b. In this case, the eccentric pins 7a and 7b have their threaded portions 7aR, 7bR rotatably fixed to the fixing plate 8, and the eccentric portions 7aS,
7bS are the slots 4b and 4c of the head device 4, respectively.
located inside the divided portion 4 of the head substrate 4a.
Make it parallel to the sides of d, 4e, and 4f. At this time, the eccentric portions 7aS of the eccentric pins 7a, 7b,
The surface of 7bS is given a smooth finish. Further, a hole with a diameter slightly larger than the diameter of the screw 6 is provided in the portion of the fixing plate 8 corresponding to the screw 6 for fixing the head board 4a. Moreover, the three divided parts 4d of the head device 4,
Balls 10a and 1 for height adjustment from the upper side of the rotating drum 1 to predetermined positions of 4e and 4f, respectively.
Height adjustment screw 11a via 0b and 10c,
11b and 11c are provided. The rest of the structure is the same as that of a conventional rotary head device.

In this example, each head, i.e., head chip 5a,
The height and angular position of the head gaps 5b and 5c are adjusted as follows. When adjusting this height, for example, as shown in FIG.
This is done by adjusting the heights of the head tips 5a, 5b, and 5c. When adjusting the angle, for example, the angle of the middle head chip 5b is first adjusted from both sides of the head board 4a by adjusting the screwing condition of the taper screws 3, and then the eccentric pins 7a, 7 are adjusted.
Rotate b to adjust the angles of the head tips 5a and 5c. When the eccentric pins 7a, 7b are rotated, the eccentric portions 7aS, 7bS, which are deviated from the center of rotation as shown in FIG. The head tips 5a and 5c come into contact with the side surface of 4f from the sides of the slots 4b and 4c, and as they rotate further, a force is applied in the direction of opening the slots, which moves the head tips 5a and 5c in the angular direction, making it possible to adjust the angle. . In this case, the eccentric portions 7aS, 7bS of the eccentric pins 7a, 7b come into contact with the side surfaces of the divided portions 4d, 4f of the head board 4a, but since the eccentric portions 7aS, 7bS have no inclination in the height direction, the height of the head increases. There is no change in the horizontal direction, and conversely, after adjusting the angles of these head tips 5a, 5b and 5c, the same head tips 5a, 5
Even if the heights of b and 5c are adjusted, there is no change in angle.

In the above embodiment, the eccentric portions 7aS, 7bS of the eccentric pins 7a, 7b are brought into contact with the side surfaces of the divided portions 4d, 4f of the head board 4a from the slots 4b, 4c side. Eccentric part 7 of 7b
aS and 7bS from both sides of the head board 4a at the dividing part 4.
d, 4f so that the slots 4b, 4
It is easy to understand that even if the angle is adjusted in the direction in which c is closed, the same effect as in the above embodiment can be obtained. Further, in the above embodiment, the eccentric pins 7a, 7b
, but it is easy to understand that an eccentric cam could be used instead. Further, in the above embodiment, an example in which three head chips were provided was described, but it goes without saying that the same structure as described above can be made in the case where two or four or more head chips are provided. Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and that various other configurations can be adopted without departing from the gist of the present invention.

Effects of the invention According to the invention, one side of one head board 4a is divided into a plurality of parts by making slots from the tip thereof, and a head device is manufactured in which a head chip is adhesively fixed to the tip of each of the plurality of divided parts. The angle between each head chip of the rotary head device can be adjusted satisfactorily.

[Brief explanation of the drawing]

FIG. 1 is a bottom view of a rotating drum of an example of a conventional rotary head device, FIG. 2 is a partially cutaway sectional view of the main part of FIG. 1, and FIG. 3 is a plan view showing an example of the head device.
4 is a partially cutaway bottom view showing a rotating drum of an embodiment of the rotary head device of the present invention, FIG. 5 is a sectional view taken along the line -- in FIG. 4, and FIG. 6 is a sectional view taken along the line - FIG. 7 is a diagram for explaining the present invention. 1 is a rotating drum, 4 is a head device, 4a is a head board, 4b and 4c are slotted parts, 4d, 4
5a, 5b and 5c are head chips, 7a and 7b are eccentric pins, and 8 is a fixing plate.

Claims (1)

[Scope of utility model registration request] A head board is divided into a plurality of parts by making a slot from the tip, and a head chip is adhesively fixed to the end of each divided part, and a height adjustment is provided for each head chip on one side above or below the head board. It consists of a screw, a plate member arranged on the other side of the head board and fixed to the head board, and an eccentric pin or an eccentric cam attached to the plate member and inserted into the slot. A rotary head device characterized in that the height and angle of the head tip are adjusted by rotating the height adjustment screw and the eccentric pin or eccentric cam.