JPH03219411A - Assembling method for magnetic head - Google Patents

Abstract

PURPOSE:To improve the adjustment accuracy of a read/write gap by making a guide shaft and an X-X' coordinate axis parallel while fitting a carriage to a chassis. CONSTITUTION:While the carriage 5 whose guide shaft 7 is inserted into the chassis 6 where a guide shaft bearing part 6b and a disk rotational center hole 6a are formed, the carriage 5 is set onto a rotational center positioning pin 14a which has a little bit smaller diameter than the disk rotational center hole 6a of the chassis provided to an adjusting jig 14. The adjusting jig 14 is equipped with a couple of length measuring instruments 15 and 16 and measuring probes 15a and 16b are in contact with both ends of the guide shaft. Both the length measuring instruments 15 and 16 are so set about the coordinate axis X-X' passing the center of the rotational center positioning pin 14a as to indicate the same numeral. The set chassis 6 is adjusted by rotating the chassis 6 according to the disk rotational center hole 6a so that both the measuring instruments 15 and 16 indicate the same numeral, thereby setting the guide shaft 7 and X-X' coordinate axis in parallel.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 2...-7 The present invention relates to a method for assembling a magnetic head of a magnetic disk recording/reproducing device used in various office automation (OA) equipment.

2. Description of the Related Art A conventional magnetic disk recording and reproducing apparatus will be explained with reference to FIG.

FIG. 2 is a perspective view showing the structure of a magnetic disk recording and reproducing apparatus. A magnetic disk 1 for recording and reproducing data is housed in a magnetic disk cartridge 2 that rotatably supports the magnetic disk.

3 is a loading mechanism for attaching the magnetic disk cartridge 2 to the recording/reproducing position of the main body of the apparatus, and 4 is a magnetic head arranged so as to be in contact with the surface of the magnetic disk 1. Reference numeral 6 denotes a carriage for moving the magnetic head 4 in the radial direction of the magnetic disk 1, and is fixed to the chassis θ by a guide shaft 7. Reference numeral 8 denotes a magnetic disk rotation drive mechanism that rotates the magnetic disk 1. A rotation center shaft 9 is supported in a disk rotation center hole (not shown) provided in the chassis 6, and a motor 10 drives the belt 1.
Drive 3 pages through 1. 12 is a carriage feeding device for feeding the carriage 6; 13 is a mechanism for controlling recording/reproducing on and from the magnetic disk 1 by the magnetic head 4; and a magnetic disk rotation drive mechanism 8;
This is a control circuit section composed of an electric circuit that controls the carriage feeding device 11.

In the configuration of such a magnetic recording and reproducing device, accurately adjusting the read/write gap of the magnetic head that records and reproduces data so that it points toward the center of rotation of the disk is important for data compatibility of the magnetic recording and reproducing device. This is an important point to ensure that.

FIG. 3 is a diagram illustrating this conventional magnetic head assembly method, and FIG. 3(a) is a perspective view of a chassis in which a guide bearing portion and a disk rotation center hole are formed.
3(b) is a perspective view showing a state in which the head is attached to the carriage, and FIG. 3(C) is a perspective view showing the state in which the carriage with the head fixed to the chassis is attached.
After adjusting the read/write gap 4a of the magnetic head 4 to a position parallel to the guide shaft 7 and away from it by A dimension as shown in b),
In the next step, the fixed carriage 5 was attached to the chassis 6, in which the disk rotation center hole 6a and the guide bearing 6b were machined, as shown in FIG. 3(0), as shown in FIG. 3(a). Note that the guide shaft 7 is a preload spring, etc., and the guide bearing is the part 6.
It is fixed so as to be pressed against b, but illustration is omitted.

Problems to be Solved by the Invention However, in the above-mentioned conventional assembly method, when processing the chassis 6 to form the guide bearing portion 6b, the processing accuracy for dimension A and the accuracy for adjusting and fixing the magnetic head 4 to the carriage 5 are insufficient. There was a problem in that the orientation of the read/write gap in the final finished product would vary due to errors occurring in each case.

The present invention solves these conventional problems,
The present invention provides a method for assembling a magnetic head that dramatically improves the accuracy of adjusting read/write gaps toward the center of rotation of a disk and makes it possible to manufacture a reliable magnetic recording/reproducing device.

5 bae.

Means for Solving the Problems In order to solve the above problems, the present invention is such that the magnetic head is adjusted after the carriage is attached to the processed chassis.

Effects According to the present invention, since the magnetic head is adjusted with the carriage attached to the chassis, the machining accuracy of the chassis and the guide bearing portion can ignore the large dimensions of the machining, so that the adjustment error of the magnetic head is reduced. It is.

Embodiment FIG. 1 is an explanatory diagram illustrating an embodiment of the magnetic head assembly method of the present invention, and FIG. 1(a) is a perspective view of a chassis in which a guide bearing portion and a disk rotation center hole are formed. , FIG. 1(b) is a perspective view showing the carriage with the head attached to the chassis, and FIG. 1(C)
1(b) is a perspective view showing a state in which the read/write gap of the magnetic head of the chassis mounted with the carriage shown in FIG. -7 A carriage 6 in which a guide shaft 7 is inserted as shown in Fig. 1(b) into a chassis 6 in which a disk rotation center hole 61L is formed with a guide bearing part sb (previous example does not require precision) as shown in Fig. 1(e). With the disk rotation center hole 6aJ:j9 of the chassis provided in the adjustment jig 14 as shown in FIG. 3(0), the slightly smaller diameter rotation center positioning pin 1
Set to 41L.

The adjustment jig 14 is equipped with a pair of length measuring devices 16.16, and the measuring probes 15a and 161L are in contact with both ends of the guide shaft. Both length measuring devices are set in advance to show the same value with respect to the coordinate axis x-x' passing through the center of the rotation center positioning pin 14a, so that the difference in distance from the x-x' coordinate at both ends of the guide shaft can be measured. It has become. Adjust the set chassis 6 by rotating it with reference to the disk rotation center hole 6a so that both length measuring instruments 15 and 16 show the same value.
The X/coordinate axis is made parallel. In FIG. 1, the chassis 6 is set with a slight inclination in the clockwise direction with respect to the x-x' coordinate axis, and the chassis 6 is rotated counterclockwise by the propulsion shaft 17 attached to the adjustment jig 14. When the values of length measuring device 15 and 16 are equal, propulsion axis 1
7 is configured to stop driving.

As described above, the guide shaft 7 attached to the chassis 6 is aligned parallel to the x-x' coordinate axis of the adjustment jig 14.
- By fixing a microscope (for example, an optical microscope with a 2000x magnification and two-part field of view) on the x' coordinate axis, adjusting and fixing the read/write gap 4a of the magnetic head so that it overlaps the x-x' coordinate axis. The gap 4a is directed toward the center of rotation of the disk with high precision.

Effects of the Invention As is clear from the above examples, the present invention has (1)
Since parallel alignment is performed with the carriage attached to the chassis, the adjustment of the magnetic head is not affected by the machining accuracy of the guide shaft of the chassis, so read/write/read/write
Gap adjustment accuracy can be improved.

(2) Since the precision of chassis processing can be relaxed, it has great effects such as making it possible to reduce productivity and processing costs.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram illustrating an embodiment of the magnetic head assembly method of the present invention, FIG. 2 is a perspective view showing the structure of a conventional magnetic disk recording/reproducing device, and FIG. FIG. 3 is an explanatory diagram illustrating a method of assembling a magnetic head. 4...Magnetic head, ta...Read...
Light gap, 6... Carriage, 6...
...Chassis, 6a... Disk rotation center hole.

Claims (2)

[Claims] (1) After a carriage is attached to a chassis provided with a disk rotation center hole, the magnetic head attached to the carriage is adjusted and fixed so that its read/write gap is directed toward the disk rotation center hole. How to assemble a magnetic head. (2) Attach the chassis and the carriage on the chassis to an adjustment jig equipped with a positioning pin inserted into the disk rotation center hole of the chassis and a length measuring device that positions the chassis using the positioning pin, and use the length measuring device to position the chassis. A method for assembling a magnetic head, which comprises aligning the chassis and then adjusting and fixing the read/write gap of the magnetic head so that it faces the rotational center hole of the disk.