JPS639087A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To freely adjust the height of a head or its off-set by integrally disposing an engagement part eccentric of the core of a guide axis on some part of the guide axis and arranging a part to be engaged with said engagement part on a base. CONSTITUTION:Column-like parts 3a and 3b on the both ends of the guide axis are columns as engagement parts integrally provided on the guide axis 3, and their cores coincide. However they are eccentric of the core of the guide axis 3. The base 4 is provided with reception parts 4a, 4b, 4c and 4d as parts to be engaged with said engagement part, and they are engaged, pressed and fixed by a retainer 5 with elasticity. If a driver is engaged with a groove 3e to rotate the guide axis 3, said axis 3 and the column-like reception part 4c. Consequently the height of the guide axis 3 can be changed in parallel with the base 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording device that uses a magnetic disk as a recording medium.

[Conventional technology]

FIG. 2 shows a cross-sectional view of the main parts of a conventional magnetic recording device. Second
In the figure, a magnetic head 21 is mounted on a carriage 22, the carriage 22 is slidably held on a guide shaft 23, and the guide shaft 23 is fixed to a base 24 by pressure.

The carriage 22 carries a magnetic disk 25 and a magnetic head 21.
A spring 28 and an upper carriage 29 are disposed to bring the magnetic disk 25 into contact with the magnetic disk 25, and the magnetic disk 25 is held by a hub 27 provided on a spindle motor 26 so as to rotate integrally with the rotation of the spindle motor 26. The position of the magnetic head 21 in the contact direction with respect to the magnetic disk 25 (hereinafter referred to as head height) and the position of the magnetic head 21 in the circumferential direction of the magnetic disk 25 (hereinafter referred to as offset) are determined by the fixed portion of the guide shaft 25 of the base 24. Mutual difference between the mounting parts of the spindle motor 26 (height red plane position), the height of the nose 27 of the spindle motor 26, the height from the held part of the guide shaft 23 of the carriage 22 to the mounting part height of the magnetic head 21, and the carriage 22 The structure is determined by the dimensional accuracy and assembly accuracy of each component, such as the mounting position of the magnetic head 21.

By setting the t-head height and offset at required positions, the performance of the magnetic recording device is stabilized and compatibility with other magnetic recording devices is guaranteed.

[Problem that the invention seeks to solve]

However, in the conventional technology described above, the head height and offset, which are important for the performance and compatibility of the magnetic recording device, are determined by the dimensional accuracy and assembly accuracy of the aforementioned component parts, so these must be manufactured with extremely high precision. did not become. The head height affects the contact between the magnetic head 21 and the magnetic disk 25, and even if the height is too high, especially on the inner circumference of the magnetic disk 25, which is less flexible, there will be a gap between the top surface of the magnetic head 21 and the magnetic disk 25. A gap (referred to as spacing loss) is created, and recording and reproducing performance is extremely degraded. Also, the offset deviation causes a functional decline (referred to as azimuth loss) of the recording/reproducing section (read/write head) of the magnetic head 21.
If this happens, the function of the erase unit (erase head) installed together with the read/write head in the magnetic head 21 will deteriorate (referred to as residual signal erasure), so the dimensional accuracy of the aforementioned components will vary from a few microns to several tens of microns. However, the problem is that the cost is extremely high. It goes without saying that unless the variation in component dimensional accuracy is reduced to zero or related components are combined, there will always be variation in the two positions relative to the target value.

Therefore, the present invention solves these conventional problems.
The purpose is to provide a low-cost magnetic recording device that can be mass-produced and has a structure in which either the head height or offset can be adjusted to allow for a wide range of precision in related components.

[Means for solving problems]

A magnetic recording device of the present invention has a structure in which a magnetic head is mounted on a carriage, the carriage is slidably held by a guide shaft, and the guide shaft is fixed to a pace. An engaging portion eccentric to the axis of the guide shaft is integrally disposed on at least a portion of the guide shaft, and the pace is provided with an engaged portion that engages with the engaging portion. It is characterized by having been established.

[Effect]

To describe the operation of the present invention, by changing the engagement abutment position of the engaging part disposed on the guide shaft with the engaged part provided on the pace, the axial center position of the guide shaft with respect to the pace is changed, and the guide The head height or offset of the magnetic head mounted on the carriage held on the shaft can be freely adjusted.

〔Example〕

Embodiments of the present invention will be described based on the drawings. FIG. 1 is a perspective view of the main parts of a carriage showing an embodiment of the magnetic recording device of the present invention, and FIGS. It is a diagram. In FIG. 1, a magnetic head 1 is mounted on a carriage 2, and the carriage 2 is slidably held on a guide shaft 5. The columnar parts 3a and 3b at both ends of the guide shaft 3 are cylinders serving as engaging parts that are integrally provided to the guide shaft 3, and their shaft centers are coincident with each other, and are eccentric from the shaft center of the guide shaft 3. The pace 4Ic has receiving parts 4a and 4b as engaged parts that engage with the engaging part.
14c and 4d, the columnar part 3a is connected to the receiving part 4b, and the shaft part 3 is connected to the receiving part 4b.
C is fixed to the receiving part 4c, the columnar part 3b is fixed to the receiving part 4b, and the shaft part 5d is fixed to the receiving part 4d by engaging and press-bonding the holding plate 5 having elasticity.

The contact surface of the columnar portion 3a of the receiving portion 4a and the contact surface of the shaft portion 3c of the receiving portion 4c are perpendicular, and the contact surface of the columnar portion 3b of the receiving portion 4b and the contact surface of the shaft portion 3d of the receiving portion 4d are vertical. The grooves 3e are also provided in the end faces of the columnar parts 3a so that they intersect perpendicularly.

The carriage 2 is also held at the auxiliary guide axis so that it does not rotate about the guide axis 3.

As shown in FIG. 5 (at, Figure 3), when a screwdriver, for example, is engaged with the groove 3e and the guide shaft 3 is rotated fully, the guide shaft 3 and the columnar part 3a become eccentric, and the shaft part 3C becomes a receiving part. 4C
Moreover, since the other end of the guide shaft 3 has a similar structure and the columnar portion 3b (not shown in FIG. 3) has the same axis as the columnar portion 3a, the guide shaft 3 is guided by the pace. The height can be changed parallel to 4. In other words, the head height can be changed. Figure 3 (
A) is the time when the head height is the highest, and Figure 3) is the time when the head height is the lowest. Note that during this movement, the presser plate 5 is elastically deformed, and even after the guide shaft 3 is moved, the guide shaft 3 is pressed and fixed in the same manner as in the initial position.

In the configuration of this embodiment, the outer diameter of the guide shaft 5, the outer diameter of the columnar parts 3a and 3b, and the guide shaft 3 and the columnar part 5a1 are
The variable range of the height of the guide shaft 3 relative to the base can be freely set by adjusting the eccentricity of the guide shaft 3, so all the dimensional accuracy and assembly accuracy of the component parts related to the head height can be absorbed, and the head height can be adjusted to the target value. It is possible to do so. It is also possible to adjust the head height to the optimum height from the rear of the magnetic recording device while the magnetic recording device is in operation and the read waveform is monitored. -The strength tree structure has the disadvantage that the magnetic head 1 tilts as the head height is adjusted, but it goes without saying that this can be solved by making the auxiliary guide shaft 6 have the same structure as the guide shaft 3. However, if the height interval between the magnetic head 1 and the guide shaft 3 is made small and the auxiliary guide shaft 6 is positioned relatively far from the magnetic head 1, the above-mentioned inclination can be sufficiently suppressed within an allowable range. .

In this embodiment, the head height can be adjusted without being displaced in the offset direction, but in other embodiments, on the contrary, the head height can be adjusted without being displaced and the offset can be adjusted. Needless to say, all that is required is to change the arrangement of the receiving parts 4a14b and 4c14d of the base 4.

In addition, in this embodiment, the guide axis and the eccentric columnar part were arranged at both ends of the guide shaft, but they were arranged only at one end, so that the height could be adjusted only on the inner circumferential side of the magnetic disk, which is largely affected by the head height. Approximate effects can be obtained even if adjustments are made.

Furthermore, in this embodiment, the part eccentric to the guide shaft (engaging part)
Since the head is cylindrical, the head height or offset is adjusted by continuously changing the position, but if the eccentric part is formed into a polygonal column, then the adjustment can be done in steps. You can also do that.

〔Effect of the invention〕

As described above, according to the present invention, by changing the abutting position of the engaging part, which is eccentrically disposed integrally with the guide shaft, with respect to the engaged part provided on the base, the engaging part Since the head height or offset, which affects the performance of the magnetic recording device, can be adjusted by acting as a cam, the dimensional accuracy and assembly accuracy of the component parts, which are related to the positional accuracy, can be largely tolerated. However, the optimum value can be manufactured without variation, and a highly reliable magnetic recording device that can be mass-produced at a very low cost can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main parts of a carriage showing an embodiment of the magnetic recording device of the present invention, FIG. 2 is a sectional view of the main parts of a conventional magnetic recording device, and FIGS. 3(a) and 3('b) FIG. 2 is a front view of the main parts around the guide shaft of the embodiment of the present invention. 1... Magnetic head 2... Carriage 3... Guide shafts 3a, 3b... Column portions 3c, 3d... Shaft portion 3e. ... Groove 4 ... Base 4 a, 4 b14 c, 4 d ... Receiving portion 5 ... Holding plate 6 ... Auxiliary guide shaft Applicant: Seiko Even Co., Ltd. Figure 2 Figure 3rIIJ (CL) Figure 3 (b)

Claims (1)

[Claims] In a magnetic recording device having a structure in which a magnetic head is mounted on a carriage, the carriage is slidably held by a guide shaft, and the guide shaft is fixed to a base, at least a part of the guide shaft is attached to the guide shaft. A magnetic recording device characterized in that an engaging portion eccentric from the axis of the guide shaft is integrally disposed on the guide shaft, and an engaged portion that engages with the engaging portion is disposed on the base. .