JPH02281412A - Positioning device - Google Patents

Abstract

PURPOSE:To set the position relation between 1st and 2nd position-set bodies with high accuracy by fixing the 1st and 2nd position-set bodies by a 1st fixing means, and fixing 1st and 2nd base bodies by a 2nd fixing means. CONSTITUTION:Magnetic heads 48a and 48b as the 1st and 2nd position-set bodies are fixed to head fitting parts 46a and 46b as the 1st and 2nd base bodies which move relatively in predetermined directions by using adhesives 50a and 50b as the 1st fixing means. Further, the 2nd base bodies 46a and 46b are fixed with, for example, an epoxy adhesive 51 as the 2nd fixing means so that the 1st and 2nd position-set bodies 48a and 48b have the specific position relation. Consequently, the mutual position relation between the 1st and 2nd position-set bodies 46a and 46b can be set with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a positioning device that can be used, for example, to position each head in a rotary magnetic head device for dynamic tracking with a plurality of heads.

[Conventional technology]

First, to explain the first conventional device, FIGS. 8 to 10 show a conventional magnetic head device disclosed in, for example, Japanese Unexamined Patent Publication No. 60-209913. VTRs that use the so-called segment recording method, which divides and records data over multiple trunks (this is what is used).
) are each magnetic head, (2) is each magnetic head rll
Head mounting plate for attaching.

(2a) is the reference plane of the head mounting plate (2), (2b)
is a screw (not shown) for attaching to the rotating drum (4)
The insertion hole (3) is an adhesive for attaching each magnetic head (1) to the head mounting plate (2). Head mounting plate (2
) is attached to the single-rotation drum (4), and faces the outer periphery of the rotating tram (4) through the window (5) provided on the single-rotation drum (4), and each magnetic heald (1,) The magnetic tape (6) is wound around the outer circumferential surface of the rotating drum (4).
It is supported so that it comes into sliding contact with the Ma;':
-+7) are tape guides, (9) is an air groove provided in the rotating drum (4), Ql is a lead surface that guides the lower end of the magnetic tape (6), and αη is a fixed drum with a processed lead surface a. It is.

In the conventional device configured as described above, the head mounting plate (2) is made of alloy steel or the like, and has a highly accurate flat reference surface (2a) on the top surface, and has a screw thread for mounting in the center. An insertion hole (2b) is formed through which the head mounting plate (2) is inserted, and when the head mounting plate (2) is attached to the rotating drum (4), it can be positioned with high precision using the reference surface (2a) with respect to the drum (4) that rotates once. It is designed to be fixed with screws.

Further, each magnetic head (1) is adhesively fixed to the tip of the reference surface (2a) of the head mounting plate (2) via an adhesive (3), and each magnetic head (1) is fixed to the tip of the reference surface (2a) of the head mounting plate (2). (2)
to the adhesive (3) which is in an uncured state immediately after being applied to the reference surface (2a) when attached to the reference surface (2a).

Within the thickness of the adhesive (3), the installation condition is finely adjusted, and after each A is installed with the appropriate protrusion, height, and angle of inclination, the adhesive (3) is cured. This ensures that proper installation is maintained.

As the adhesive (3), an epoxy resin adhesive having a low linear shrinkage rate and a low coefficient of thermal expansion is used, for example.

Next, a second conventional device (to explain more specifically, FIGS. 11 and 12 show a rotary magnetic head device for dynamic tracking disclosed in Japanese Unexamined Patent Publication No. 173217/1983). (here, ■ is the drive coil,
Both are cylindrical magnets that hold the pole piece ■, c
Reference numeral 14 is made of a soft magnetic material, and includes an upper part (24a) and a body part (24a).
A dish-shaped or cylindrical yoke divided into a lower part (41)) and a lower part (24c), which creates a cylindrical magnetic gap (
) is formed. (24d) and (24e) are attachment parts for attaching gimbal type screws (27a) and (27b), respectively. Gimbal spring r27a) and (2
7b) is made of metal, for example, a copper alloy such as titanium or phosphor copper, and the outer peripheral edges of the parts (24d) and (24e) are parallel to each other and are attached coaxially with the gear hub 3. The bobbin held in (:(
4) and adhesive ω at right angles to the central axis Bf of the yoke. In addition, gimbal springs (2
A magnetic head (1) is fixed to the tip of 7a) with an adhesive (not shown). ((1) is a mounting screw hole for fixing to a rotating drum, etc., and (5) is a magnetic shield member that prevents the flow of magnetic flux from the yoke area.

Figures 12a and 12b are plan views of the gimbal springs (27a) and (27b) shown in Figure 11, respectively. , morning is a circular outer periphery, (to) is a hole provided in the center for attaching the bobbin (34), and field is an arcuate notch.

[Problem to be solved by the invention]

Since the first conventional device is configured as described above, the gap distance and Although it is relatively easy to obtain precision for the head protrusion amount, the head step amount (relative height between the heads) depends on the thickness of the adhesive (3), so there is a limit to the accuracy of the adhesive jig No. 7. Ta. There is also a limit to the fact that Re can be produced by the adhesive (3) itself, and there is a problem in that it is difficult to achieve precision.

Further, it is clear that even if the head positioning technique of the first conventional device is applied to the second conventional device, the above-mentioned R degree cannot be improved.

This invention was made to solve the above-mentioned problems, and it is possible to position and hold a plurality of magnetic heads at predetermined positions at the tip of a gimbal type spring. The purpose is to obtain a device that can perform positioning at once.

[Means to solve the problem]

The positioning device according to the present invention includes first and second base bodies that are movable relative to each other in a predetermined direction.

The first and second position setting objects whose relative positions are to be set are each fixed by a first fixing means, and the first and second base bodies are fixed so that the first and second position setting objects maintain a predetermined positional relationship. It is fixed by the second fixing means.

[Effect]

According to the eighth aspect of the present invention, the first and second base bodies, which are movable relatively in a predetermined direction, are fixed by the second fixing means, so that the positional relationship between the first and second positioned bodies is fixed. Set to high precision.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 8 to 6. Each figure Cc8, throat is head position, 1
1 is a gimbal spring 142 corresponding to the gimbal spring (27a) of the second conventional device. +43. (2) and H respectively have an arcuate intermediate portion and a circular outer peripheral portion.

A hole and an arcuate notch for attaching the pobbin (34).

(46a) and (46b) are the head mounting portions that are the first and second bases that can move relative to each other within the elastic limit of the material in the front and back directions of the paper, respectively, and @η is the head mounting portion (46b).
A slit formed between 6a) and (46b),
(48a) and (48b) are magnetic heads serving as first and second positioned objects whose relative positions are respectively set;
(49a) and (49b) are the magnetic heads (49b), respectively.
Ra ) and (48b) head gap, (50
a) and (ffifi) are the head attachment part (4h
Magnetic heads (48a) and (48a) are attached to a) and (46b).
b) An epoxy adhesive serving as a first fixing means for fixing.

(51) is applied to Surin Gl so that the magnetic heads (4h) and (48b) maintain a predetermined positional relationship, and serves as a second fixing means for fixing the head mounting parts (46a) and (46b). It is an epoxy adhesive.

The head mounting body (A) replaces the gimbal type spring (27a) shown in FIG.
It constitutes TR.

To explain in detail based on each figure, Fig. 1 shows the state after the assembly of each part with the above configuration is completed,
FIG. 2 shows how the magnetic heads (4Ra) and (48b) are attached to the head attachment parts (46L) and (46b).

Figures 3a and 3b show the magnetic heads (4&) and (48b), respectively, viewed from the direction of arrow C shown in Figure 2, and in the figures, H□ and Hbl indicate the respective head gaps (49a). and (49b) from the bottom of the magnetic heads (48a) and (48b), and usually has a width of several tens of microns due to manufacturing variations.

FIGS. 4 and 5 are also views seen from the direction of arrow C shown in FIG. 2, and show the process of fixing the magnetic heads (48a) and (48b) to the gimbal spring springs.

In the figure, when one of the magnetic heads (48a) is first bonded with adhesive (Floa), from above the surface (46g,) of the head mounting portion (46a), which is the magnetic head bonding reference surface,
The height Hag to the center of the head gap (4qa) is
Adhesive thickness HaB - height Ha, and head gap (
49a) to the center of the head gap (49a). Note that the gap reference height Ha is usually set to half the track width recorded on the magnetic tape.

Next, attach the magnetic head (48b) with adhesive (50
b) through the surface (46b,
) of the magnetic head (48a), the head gap (49
The center of a) is used as a reference position and the adhesive is attached at a predetermined gap distance.

Next, a method for adjusting the head level difference between the head gaps (49a) and (49b) will be explained (see Figs. 5 and 6).
(see figure). First, a predetermined head step amount 2 that depends on the gap distance L, tape speed, drum rotation speed, etc. can be expressed by the following equation.

Z-Hb2-1482
b) Then, adhesive (FII) a) and (50
The thicknesses of b) are Ha and Hb, respectively, so Z = (Hb, +Hbs-1-Hb4) - (Ha
1-I-Ha, +Ha, ) = (E(b, -Ha
l ) + (Elb, -Ha, ) + (Hb,
-f(a, ), and the gap reference height Ha4-Hb
From 4, further Z = (Hb, -f(al) +
(Hb, -Hag) (3). Here, since the thicknesses Ha and Hb of the adhesives (50a) and (50b) slightly vary during the bonding operation, the heights Ha and Hb of the lower end of the hend gap.

are selected and used so that the head height difference is approximately 2.

Normally, the height of the lower end of the gap is controlled at a pitch of several μm, so even though there may be a slight difference between the thicknesses HaB and Hb of adhesives (50a) and (50b), the third formula shows the head that should be set. A few μm for a step difference of 2! An error after tl will occur. Therefore, use a jig (not shown) to move the head mounting parts (46a) and (46b'') a little in the vertical direction in the figure and adjust so that the desired head height difference can be achieved.After adjustment, ) By pouring adhesive into Glη, the head attachment part (46a) and (
46b) and fix them so that they do not move relative to each other. Note that the gimbal type spring U° C. is thin and the amount of movement by adjustment is small, so the amount of residual strain is small and there is almost no change over time.

As described above, in this embodiment, since the directions in which the head mounting portions (mu) and (46b) can move relative to each other are predetermined, only the head step height Z can be easily adjusted, which improves the adjustment accuracy. It is possible to increase the

Fig. 7 shows another embodiment of the present invention, in which a circular hole (47a) is formed at one end of the slit (b) in contrast to the embodiment shown in Fig. 1. In addition to having the same effects as the embodiment, the head mounting portion (46a) and (
46b) can move relatively easily.

In each of the above embodiments, the slits (B) can be formed by various methods such as etching and pressing, and any of them may be used. Furthermore, in each of the above embodiments, the case where there are two magnetic heads has been explained.

The present invention can also be applied to cases where more magnetic heads are provided.

〔Effect of the invention〕

As described above, according to the present invention, the first and second position-setting bodies, whose relative positions are set, are fixed to the first and second base bodies, which are movable relatively in a predetermined direction, respectively, using the first fixing means. The first and second base bodies were fixed by the second fixing means so that the first and second position-setting bodies maintained a predetermined positional relationship, but the positions of the first and second position-setting bodies remained constant. This has the effect that relationships can be set with high precision.

[Brief explanation of drawings]

1 to 6 show a magnetic head device according to an embodiment of the present invention, FIG. 1 is a plan view after assembly is completed, FIG. 2 is a diagram showing the state of assembly, and FIGS. 3a and 3b. 5 is a detailed view showing the hend gap surface of the magnetic head, FIGS. 4 and 5 are front views showing the method of mounting and adjusting the magnetic head, and FIG.
The figure is a front view showing the head step after J1 adjustment, FIG. 7 is a plan view showing another embodiment of the present invention, and FIGS.
The figure shows the first conventional device, Fig. 8 is a perspective view of the magnetic head device, Fig. 9 is a front view of Fig. 8 seen from the head gap direction, and Fig. 1O is a rotating drum on which the magnetic head is mounted. A perspective view showing an operating state in which the magnetic tape and the magnetic tape are in contact with each other, and FIGS.
1 is a sectional view showing a magnetic head device for dynamic tracking, and FIGS. 12a and 12b are sectional views showing a magnetic head device for dynamic tracking.
FIG. 3 is a plan view showing details of the illustrated Zi/Pal spring; In the figure, (46a and r46b) are the head mounting parts, and (4Fla) and (48b) are the magnetic heads, respectively. (5tla), (b)b) and (51) are each adhesive agents. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] first and second position-setting bodies whose relative positions are set; first and second base bodies that can move relatively in a predetermined direction;
A first fixing means for fixing the first and second positioned objects to the first and second bases, respectively; A positioning device including a second fixing means for fixing a second base.