JPH0460912A - Drum unit - Google Patents

Abstract

PURPOSE:To obtain a high-accuracy magnetic head rotating track without being affected by work and assembly by fixing a magnetic head chip onto one flange plate with step fixed to a rotary shaft while adjusting the thickness of an adhesive agent. CONSTITUTION:A magnetic head is stuck onto one flange panel 13 with step integrally fitted with a shaft 2a as the rotary shaft, and thickness t1 and t2 of an adhesive layer 6d is adjusted when sticking a magnetic head chip 6a. Namely, when the magnetic head chip is fixed by the adhesive agent 6d, a head height 1h from a lower drum fitting face 1a is adjusted according to the thickness of the adhesive agent 6d, and an inter-head step 1g between the lower ends of head gaps 6b of plural magnetic head chips 6a is also adjusted according to the thickness of the adhesive agent 6d. Thus, the high-accuracy magnetic head rotating track can be obtained while reducing accumulated error on work or assembly, and the process of assembly is simplified as well.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drum unit of a rotary or rad type magnetic recording/reproducing device such as a VTR or DAT, and particularly relates to the attachment of a magnetic head.

[Conventional technology]

For example, Japanese Unexamined Patent Publication No. 59-223927 and Utility Model Application No. 64-
The structure of the conventional drum unit shown in Japanese Patent No. 801 will be explained.

Fig. 4 is a perspective view showing the appearance of a conventional drum unit, Fig. 5 is a sectional view of a conventional upper drum unit, Fig. 6 is a sectional view of a conventional upper drum unit, and Fig. 7 is a sectional view of a conventional upper drum unit.
A cross-sectional view of the ram unit, and FIG. 8 is an enlarged view of the .

In the figure, (1) is the fixed lower drum, (1a)
(1) is the lower drum mounting surface which becomes the surface to be attached when the lower drum (1) is fixed to the deck mechanism of the magnetic recording/reproducing device;
2) is a shaft-integrated bearing, (2a) is a shaft that is a rotating shaft and has an inner ring, (2b) is an outer ring, and (2e)
is a steel ball, (2d) is a preload spring, (3) is a lower drum (1)
The fixed side rotary lantern (4) is fixed to the rotary lantern (2a), (4a) is the -
The drum mounting surface of the horn (4), (4b) the drum fitting part of the flange (4), (5) the rotating side rotary lance fixed to the flange (4), and (6) the signal (6a) is a magnetic helad tip,
(6b) is the head gap, (6C) is the head base to which the magnetic helad tip (6a) is attached, (6d) is the adhesive that fixes the magnetic helad tip (6a) to the head base (6C), (7) is the rotation (7a
) is the flange mounting surface of the upper drum (7), (7b) is the notch called a window provided in the upper drum (7), (8)
(9) is the screw that attaches the magnetic head (6) to the upper drum (7), (10) is the step adjustment screw, (11)
' is the drive motor that rotates the double drum (7), [is the distance in the rotational axis direction from the lower drum mounting surface (1a) to the upper drum mounting surface (4a)] is the double drum mounting height, ]'
The distance between the Uba7 Lanre mounting surface (7a) and the magnetic head (6), 1h is the distance between the magnetic head (6) from the lower tram mounting surface (1a).
6), 1g is the height difference between the heads, which is the difference in height between the lower ends of the helad gaps (6b) of the plurality of magnetic heads (6).

Next, we will explain the assembly process of the internal drum unit ν1.
is fixed by press-fitting, shrink-fitting, gluing, etc., and
The fixed side rotary lanos (3) is glued to the lower drum (1). Then, after the rotating side rotary lanos (5) is glued to the flange (4), the rotating side rotary clitoris (5)
) and the fixed rotary lance (3), the flange (4) is fixed to the shaft (2a) by a method such as press fit or shrink fit so that the gap between the fixed side rotary lance (3) is a predetermined value. A lower drum unit is obtained. Then, the upper drum mounting surface (4a) and the upper drum fitting part (4b) of the flange (4) are precisely processed using the shaft (2a) as a reference, and the upper drum mounting height lf1 shown in FIG. The perpendicularity of the upper drum mounting surface (4a) with the shaft 71 (2a) and the coaxiality of the upper drum fitting part (4b) with the shaft (2a) are ensured.

On the other hand, the magnetic head (6) is adjusted so that the distance 1u between the flange mounting surface (7a) of the upper drum (7) and the magnetic head (6) is a predetermined value. ]
The screw is finely adjusted so that it protrudes a certain set distance from the outer circumferential surface of the screw ( 8) to the upper drum (7), the upper drum unit shown in FIG. 6 is obtained. Each of the above adjustments requires precision on the order of microns.

Then, the upper drum unit is fixed to the 7 langes (4) of the lower drum unit with screws (9), and the drum unit shown in FIG. 7 is obtained. The head height 1h is equal to the upper drum mounting height 1f and the Franz mounting surface (7) of the upper drum (7).
It is determined by the distance lu between a) and the magnetic head (6).

Finally, the radial gears (6h) between the plurality of magnetic fields are adjusted to a predetermined height difference of 1g between the heads by pushing and pulling the height adjustment screw 00).

[Problem to be solved by the invention]

The conventional drum unit is constructed as described above.
Even if the upper drum is fixed to the 7-lunge, if the mounting accuracy of the upper drum is poor, or if the machining precision of the upper drum itself is poor due to eccentricity, or the machining precision of the upper drum mounting surface of the flange is poor,
There is a problem in that the desired accuracy cannot be obtained in the rotation locus of the magnetic head.

Additionally, there is a problem in that errors in the height of the magnetic head due to various processing and assembly processes accumulate.

This invention was made in order to solve the following problems: it is possible to obtain a high-precision magnetic head rotation trajectory with small cumulative errors in processing and assembly, and it also simplifies the assembly process. The object of the present invention is to obtain a drum unit for a rotary head type magnetic recording/reproducing device.

[Means to solve the problem]

The drum coat knit according to the present invention is designed such that the magnetic head is attached onto a stepped flange plate (7) which is integrally attached to the shirt (which is the rotating shaft), and when the magnetic head chip is attached. The thickness of the adhesive layer can be adjusted accordingly.

[Effect]

In the drum unit of this invention, the magnetic head chip is attached by adjusting the thickness of the adhesive to the stepped flange plate that is integrally attached to the rotating shaft. Not affected by accuracy or assembly accuracy.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a sectional view of a drum unit showing an embodiment of the present invention, FIG. 2 is a sectional view of a lower drum unit, and FIG. 3 is an enlarged view of a head gap portion for explaining adjustment of the height difference between magnetic heads.

In the figure, (12) is a sleeved integrated shaft bearing (1
2a) is a cylindrical sleeve that covers the outer peripheral surface of the bearing, (13
) is a stepped fludge plate, (13a) is a magnetic head chip mounting surface, (13b) is a -I Nidram mounting surface, (13
e) is "21-runo, fitting part, (13d) is a hole provided in the stepped flange plate (3rd), (14) is a hole (+3
d) is line d connecting the rotating side entrance - Taritranos (5) and the magnetic head sentsubu (6).

Note that parts that are the same as or equivalent to those of the above-mentioned conventional device are marked with the same symbols and their explanations will be omitted.

Next, the configuration will be explained. Figure 1 shows the entire drum unit after assembly is completed, and the rotary side rotary I-(2a) of the sleeved shaft-integrated bearing (12) fixed to the lower drum (1) is connected to the rotary side rotary l-(2a). Lance (5)
The first stepped flange plate (13) to which is fixed;
A plurality of magnetic head chips (6a) are attached to the magnetic/\throat 7° mounting surface (13a) of the stepped flange plate (13), and the upper drum mounting surface (13b) of the stepped flange plate (13). The upper drum (7) is attached to the upper drum fitting part (13c).

Next, the assembly process will be explained. In FIG. 2, the sleeved shaft-integrated bearing (12) is first fixed to the lower drum (1) by press fitting, shrink fitting, or gluing.

Next, the fixed side rotary transformer (3) is attached to the lower l.ram (1).
It is fixed by adhesive. On the other hand, the stepped 7 lunge plate (1
3), a rotating side rotary transformer (5) is fixed with adhesive. The stepped flange plate (13) to which the rotating side rotary trannos (5) is fixed is press-fitted so that there is a set distance between the rotating side rotary transformer (5) and the stationary side rotary transceiver (3). It is fitted and fixed to the shirts l to (2a) by shrink fitting, adhesion, or screwing. .

Then, the magnetic head chip (6a) is fixed to the magnetic head chip mounting surface (13a) on the stepped flange plate (13) with an adhesive (6d). At this time, the head height lb from the lower drum mounting surface (la) is adjusted by the thickness of the adhesive (6d), and as shown in FIG. (6b)
The height difference 1g between the heads between the lower ends is also adjusted by the thickness of the adhesive (6d). For example, one magnetic head chip (6a
) is the head height lh, adjust the thickness Ll of the adhesive (6d) and fix -C, then use other magnetic / ＼t-f sea! (6a) is fixed by adjusting the second thickness of the adhesive (6d) so that the height difference between the heads is 1 g based on the lower end of the head gap (6b) of the first magnetic chip (6a). Also, at this time, multiple magnetic 7
The amount of protrusion of each of (a), the posture of the mounting, and the angle (index) of the mounting are simultaneously adjusted and fixed to a predetermined accuracy.

Connections with the Z-0 winding and the signal line (14), etc. are made.

After that, the upper tram mounting surface of the stepped flange plate (13) (
13b), the upper tram (7) is fixed via the upper drum fitting part (13c) with a plurality of screws (9), and the upper tram (7) is fixed to the first
A drum unit not shown in the figure can be obtained.

In addition, in the embodiment described in -1-, after the stepped flange plate (13) is fixed to the shirt 1- (2a), the :L? i I attached the magnetic head chip (6a), but Java 1-(2
Magnetic l\ of stepped flange plate (13) based on a)
The thickness of the adhesive (lid) may be reduced by 4 degrees by applying precision finishing to the Tsudochimp mounting surface (+3a).

In addition, in the above Example-C, the stepped 7 flange plate (13) was fixed to the shaft (2a) and then the upper drum (7) was attached as it was, but the stepped flange plate (7) was attached with the shirt L-(2a) as a reference. 13) -l Nidrum mounting surface (+31+)
- Precision processing is applied to the drum fitting part (13c) to improve the accuracy of the upper drum mounting surface (13b) and the upper drum fitting part (13c) relative to the shaft (2a). ”You may do so.

In addition, in the above embodiment, the shaft-integrated bearing with sleeve (13)
However, a shaft-integrated bearing (2) without a sleeve or a normal ball bearing may also be used.

Further, in the above embodiment, the step adjustment screw 00) is omitted, but if, for example, shrinkage of the adhesive (6d) until it hardens cannot be predicted, the step adjustment screw 00) is provided.

As described above, according to the present invention, since the magnetic herad tip is fixed to the stepped flange plate fixed to the rotating shaft by adjusting the thickness of the adhesive, ten tram and step flange plates are fixed. Realizes a highly accurate magnetic / gutter rotation trajectory without being affected by the processing accuracy or assembly accuracy of the attached flange plate.

:117,・＼Height adjustment, head installation 3I! l adjustment,
Head level difference adjustment can be done at once, which simplifies the process and is effective.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the drum unit, not showing an embodiment of the present invention, Fig. 2 is a sectional view of the lower drum unit, and Fig. 3 is a magnetic/head gap section for explaining the step adjustment between 1 and 1. An enlarged view, FIG. 4 is a perspective view showing the appearance of a conventional drum unit, FIG. 5 is a sectional view of a conventional lower drum unit, FIG. 6 is a sectional view of a conventional upper drum fitting part 1-, and FIG. FIG. 8 is a cross-sectional view of a conventional drum unit and an enlarged view of a head gap portion illustrating a conventional adjustment of the height difference between magnetic heads. In the figure, (1) is the lower drum, (2al is the shaft,
(3) is a fixed side rotary lance, (5) is a rotating side rotary lanos, (6a) is a magnetic head chip, (6b
) ha (I2) Rad gap, (6d) is adhesive, (7) is upper drum,
(13) is a stepped flange plate, (13a) is a magnetic head chip mounting surface, (13b) is an upper drum mounting surface, (13c)
) is the upper drum fitting part, lh is the head height, Ig+
The four-step difference, tl, and t2 are the adhesive thicknesses. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (3)

[Claims] (1) In a drum unit equipped with a plurality of magnetic heads of a rotary head type magnetic recording/reproducing device using a tape-shaped magnetic recording medium and configured to form diagonal signal tracks on the magnetic recording medium, the magnetic It consists of a head, a rotating upper drum, a fixed lower drum, a pair of transformers for transmitting and receiving signals from the magnetic head, a stepped flange plate rotatably supported, a rotating shaft, and rotating means. The upper drum, the rotating side of the transformer, and the plurality of magnetic heads are respectively attached to different surfaces of the stepped flange plate, and the plurality of magnetic heads are arranged at a distance from the reference plane in the direction of the rotational axis and each magnetic head. The drum unit is fixed on the stepped flange plate with a relative distance in the rotation axis direction between the two being adjusted by the thickness of the adhesive. (2) The drum unit according to claim 1, wherein the magnetic head mounting surface of the stepped flange plate is precision-machined and finished with the shaft as a reference. (3) The drum unit according to claim 1, wherein the upper drum mounting surface and the upper drum fitting portion of the stepped flange plate are precisely machined and finished with the shaft as a reference.