JPS5979422A - Head assembly - Google Patents

Abstract

PURPOSE:To control simply and with high accuracy both the gap space and the positions of two head chips by applying the force to an elastic substrate fitted with those two chips in the direction where these chips approad each other and controlling the position of each head chip. CONSTITUTION:Head chips 28 and 29 are fixed by adhesion to a substrate 21, and this substrate 21 is attached to a rotary drum 35 by a screw 22. Thin thickness parts 23 and 24 are provided at attachment parts of the chips 28 and 29 to ensure the elasticity of the substrate 21. A taper screw 26 touches the part 24 and presses it toward the arrow mark 33. As a result, the position of a head gap 31 is moved in the direction where the chips 28 and 29 approach each other. Thus the position of the gap 31 is controlled together with the space between head gaps 30 and 31. As a result, the space between gaps 30 and 31 is controlled to a prescribed value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a head assembly, and relates to a head assembly in which two head chips are provided adjacent to each other in 9;I 4).

(Prior Art) In the present specification, an example of a rotary head acenob 9 used in a 12-head hexagonal scan type magnetic recorder (hereinafter referred to as a VTR) will be described.

In recent years, in order to reproduce still images without blur as a special reproduction function in v'rit, two heads with the same azimuth angle are mounted on two rotating members with a phase difference of approximately 181)°.
The second head is attached to the rotating part of the rotary head assembly so that the same recording trajectory can be traced and internalized by the second head. If two heads are to be used in common, one for the special 1st grade and the other for the 1st recording, it is necessary to provide two heads with different azimuth angles in close proximity.

FIG. 1 is a diagram showing the vortex distribution of the head as described above. 1
．． 2 is for normal recording and playback 4, respectively, with RAD,
The heads have different azimuth angles.

The heads 1.2 are arranged on the rotating drum 5 with a phase difference 1806 from each other. 3 is a head provided for the above-mentioned special C/main use, and the azimuth angle is the same as that of head 2. That is, when playing a still image as described above, t''1.
The recording locus recorded by head 2 is mutually reproduced by head 2 and head 3. Originally, it would be ideal for the head 2 and the head 3 to be arranged with a phase difference of 180 degrees from each other, but this is structurally impossible.

One phase difference is slightly shifted by 180 degrees so that the video signals reproduced by heads 2 and 3 become continuous video (i).For example, the video signals are shifted by one horizontal scanning period. Since the head 3 and the head 3 have different azimuth angles and are arranged close to each other, the position and spacing of the head gap of the head L and the head gap of the head 3 must be determined with high accuracy. The Rad gap and the head gap of the head 3 are usually fixed on the same substrate. 4 is a magnetic tape on which video signals are recorded and reproduced. Since there is a deviation t in this configuration, two Rad chips are connected as described above. There arises a need to provide an accurate and close proximity to a predetermined position.

FIG. 2 is a diagram showing a main part of an example of a conventional head assembly in which two Herad chips are provided close to each other. 6 is a helad chip 8 and head chip 9 Saiko pasted, screw 7
This is a substrate fixed to the rotating drum 18 by. 10
．． Reference numerals 11 indicate hedyanops of the head chips 8 and 9, and the azimuth angles thereof are different from each other. 12.1
3 is a winding that picks up the input and output signals of the head knobs 8 and 90, respectively.

14.15 is a winding window provided in the Herad tip 8.9 for 64 windings 1112.13.

However, in order to accurately determine the distance between the head gaps 10 and 11 and the position of the head gap J, 0.11 shown in a in Fig. 1 in a head assembly configured as shown in Fig. 8 and 9 (as for the plate 6, high precision was required for fixing the substrate 6 to the rotating drum 18, which resulted in poor workability during assembly. Helad Gap 10.
11 was deviated from the predetermined position, it was difficult to adjust it.

FIG. 3 is a diagram showing a main part of another example of a conventional head assembly in which two head chips are provided close to each other. Components similar to those in FIG. 2 are numbered 1-i and the explanation thereof will be omitted. A groove 16 is provided in the substrate 6, and the groove 16
A taper screw 17 is inserted inside. By moving this taper screw 17 up and down, the base plate 60 becomes elastic and the distance between the head gap 10 and the head gap 11 (
(indicated by a' in FIG. 3) is adjusted.

However, in the configuration shown in Fig. 3, the head gap 1
If the positions of head gaps 10 and 11 are successfully determined, the spacing between the two head gaps 10 and 11 can be precisely adjusted, but
1 is deviated from the predetermined position in the same direction, adjustment is impossible. For example, when applying head chips 8 and 9 to heads 1 and 3 shown in FIG. 1, head 1 is placed 16. niheydo 1
f: The position of the head chip 8 must be determined accurately. However, the taper screw 17'f
: When the position of the head chip 8 is fully adjusted using this method, there is a drawback that the distance a' deviates from the predetermined distance.

Further, the spacing between the spacing gaps 10 and 11 is on the order of several hundred microns in the case of still image reproduction as described above, and the taper screw 17 cannot be made thicker, which causes problems in terms of strength.

(White eyes) In view of the above-mentioned drawbacks, the present invention provides a head assembly in which the gap distance between two Herad chips and their respective positions can be easily adjusted with high accuracy, and the accuracy during assembly is not as much of a problem. The purpose is to provide

Another object of the present invention is to create a head assembly that is stronger than the conventional one in terms of the gap distance between the two Herad tips and the ability to adjust the respective positions tF and t'. It is about providing.

(Embodiment) FIGS. 4(A), CB), and (C) are diagrams showing how to adjust the position and spacing of two spacing gaps of a head assembly as an embodiment of the present invention.

Reference numeral 21 designates head chips 28, 291 and a substrate to which they are bonded and fixed. The board 21 is rotated by screws 22, 3
5 is installed kJ. Figure 4(A) shows the group '41. <
21 i is a diagram showing a state immediately after being attached to a rotating drum 35. The spacing in this state of the gear luffs 30 and 31 of each of the head chips 28 and 29 (Fig. 4 (A)
(indicated by b) is the interval set after adjustment, which is wider.

The substrate 21 has thinner portions 23 and 24 at the mounting portions of the head chips 28 and 29 to provide elasticity.

Figure 4 (13) shows the helad gap 3 of the helad tip 28.
It is a figure which shows the state immediately after adjusting the position of 0. That is, bring the dipavis 25 into contact with the thin section 23.

By pressing the thin part 23 in the direction shown by the arrow 32 in the figure, the position of the head gap 3o is
There is a movement 7J) L-C in the plastic rotation, that is, in the direction of bringing the head chips 28 and 29 closer together. Head chip 28.29 arrangement 6
°, shown in all 1st riko head l, 3! If the arrangement is as shown in FIG.
fLIL head chip 28 is fully adjusted.

FIG. 4 (0 is a diagram showing the state after adjusting the position of the gear lug 31 of the head chip 29 and the interval between the head gaps 30 and 31. The taper screw 26 is connected to the thin part 24
, and presses the thin portion 24 in the direction shown by the arrow 33 in the figure. As a result, the head gap 31 (J) position is moved in the direction of bringing the head chips 28 and 29 closer together.
Position of head gap 31 and head gap 30.3
The interval between 1 is adjusted. In this way, the spacing between the head gaps 30 and 31 is adjusted to a constant I/r spacing (indicated by t in the figure).

Storehouse! Figure 75 U'1 The present invention shown in Figures 4 (A), (B), and (C).

FIG. 1 is a cross-sectional view of a main part of a head assembly according to an embodiment and 1-. Components that are the same as those in Figures 4 (A), (B), and (C) are designated by the same number 4. Taper screw 25.
26: By screwing in the directions shown by arrows 36 and 37 in the figure, :)'t, head gap 30, 31-&co respectively move in the directions shown by arrows 38 and 39 in the figure, and position f to χ. This is a book that makes it possible to adjust the rules of the world.

FIG. 6 is a cross-sectional view showing how the plate 21 shown in FIGS. 4 and 5 is fixed to the rotating drum 35 with screws 22.

”Double series 1li1. In the head assembly with the following configuration:

Without particularly increasing the adhesion accuracy of the two helad chips to the substrate, the helad gap of each head chip is approximately 11
The distance between R1'' and the head gap can be adjusted easily and as desired.

As shown in Freezer 1, the taber screws 25 and 26 are placed on the outside of the board 21! Then, attach the thin parts 23 and 24 to the head chip 28.
．． 29 is pressed in the direction of ;L+': i');-', and the thickness of the taber screws 25 and 26 can be made thicker.

As shown in FIG. 3, the head assembly has a stronger C.

In this specification, in the actual example in i, the head gearing was adjusted by 11 degrees using a taper screw, but y n! However, the material to be used is not limited to the Taber screw, but any type of Cq structure will do as long as it adds two pieces in the direction of bringing the throat tips closer together.

1. According to this specification 71, there is a head assembly for special reproduction of a VTR.2. This was explained using an example.

The application of the present invention is not limited to the special reproduction head assembly of a VTR, but can be applied to any type of head assembly in which two Herad chips are disposed close to each other and has a TR3 configuration.

(Effects) As explained above, in the head assembly of the present invention, force is applied to the elastic substrate on which the two head chips are attached in a direction in which the two head chips approach each other. Since the configuration is such that Q% can be adjusted to n1,
The gap 1]1'' distance and position between two head chips can be easily adjusted with high precision.

Since the accuracy during assembly does not reach 1, it is also effective in improving workmanship.

In addition, a pair of adjustment members presses the board in the direction of bringing the two head chips closer together for adjustment.This allows the adjustment parts to be arranged without space constraints, resulting in excellent strength. Head assembly can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the head arrangement in a VTR to which the present invention can be applied. ε1JJ2 Figure 1 shows the main parts of an example of the head assembly of the Jori. (13), (C) is a diagram showing how the position and interval of two spacing gaps of a head assembly as an embodiment of the present invention are fully adjusted. 5 is a cross-sectional view of the main parts of the head assembly as an embodiment of the present invention shown in FIG. 14. FIG. FIG. 6 shows a state in which the substrate shown in FIG. 2144, grr, and FIG. 21 t is a substrate, 25 and 26 are tapered screws as adjustment parts U, and 28 and 29 are head chips. Out 1iii person Canon Co., Ltd. No. 11 Figure 3

Claims (1)

[Claims] 1) Two head chips, a plate that fixes the two head chips and has at least a part of elasticity, and a front M: for determining the positions of the two head chips. A head assembly comprising a pair of adjusters that apply forces to the j3tJ jKt substrate for individual adjustment. 2) The head assembly according to claim 1, wherein the adjustment portion A-( is a force (a) applied to the substrate in a direction to bring the two head chips all close to each other.