JPS61233476A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To eliminate scattering of amount of off-track due to variation of ambient temperature and humidity by constituting the first and second carriages using the same material with the frame and mounting a head on an end. CONSTITUTION:A frame 13 is formed of aluminium die casting having coefficient of thermal expansion approximates to that of a disk 2. An upper carriage is made of aluminium material similar to the frame 13, and a suspension 8 is coupled with a coupler 7 on an end, and an upper head 3 is mounted combining the base of the upper head 4 made of plastic etc. in a body at a position that conforms to required position of the upper head 3 on another end. Base material of a lower carriage 12 is aluminium same with the frame 13 similarly to the upper carriage 5, and combined with a base 10 of lower head in a body, and a lower head 11 is mounted on it.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to flexible disk drives, etc.
The present invention relates to a structure for mounting and moving a head in a magnetic recording device that rotates a disk and performs random access for recording and reproducing.

[Summary of the invention]

In the structure of the means for mounting and moving the head of the magnetic recording device described above, the present invention uses a material equivalent to the frame and a material having a coefficient of thermal expansion and a coefficient of humidity expansion similar to that of 7 reams as a base material. By configuring the first carriage and the second carriage on which the head is mounted by integrally combining other members that serve as a means for mounting the head on the disc, even if the temperature and humidity environment changes, the disc will not be affected. The recording/playback position is stable.

[Conventional technology]

The structure of the means for mounting and moving the head of a conventional magnetic recording device, such as a 7-lexiple disk drive, which rotates a disk and performs random access for recording and reproducing, is as shown in FIGS. 5 and 4. there were.

Approximately the upper half of FIGS. 5 and 4 is a cross section of the main part of the carriage, which is a means for mounting and moving the above-mentioned head,
They are the same. Approximately the lower half explains the amount of deviation between the relative position of the disk and the head in the d-axis, that is, the off-track amount, the X axis is the distance between each point, and Y@ is due to the change in hot water temperature. FIG. 2 is a diagram illustrating the temperature-off-track characteristics of the upper carriage and the temperature-off-track characteristic of the lower carriage, which represent the amount of elongation between each point.

In the upper half of FIGS. 3 and 4, reference numeral 21 denotes a motor that rotates the disk in the direction of the two parts, and is fixed to a frame 29 made of die-cast aluminum, for example. 28 is a lower carriage with a 25 lower head mounted thereon, and has a structure that allows it to slide in the direction of the pass mark by engaging with a means for rotating in the O section direction, such as a 50 lead screw, for example.
It is made of a single material, such as plastic, which is different from the 29 frame. 25 is an upper carriage that carries the upper head 24 and is integrally connected to the suspension 27, which is an elastic body, and is fixed to the lower carriage 28 and has a structure that slides integrally in the ← direction. Consists of a single material such as A spring 26 pushes the upper carriage 25 and brings the lower head 23 into close contact with the upper head 24 via the disk 22.

[Problems and Objectives to be Solved by the Invention] However, in the above-mentioned prior art, as shown in the lower half of FIG. becomes as follows.

■Change in 22 disks of φxu→・・・7tt
■φ! 1.12) 297 frames of ffi -°yu...y.

(Ri xtmxu's 50 lead script 21 changes
-...Song (7*s -7t*)■ ”1)x
Changes in the 28 lower carriage of II (-'-...(ytr 7
ts) ■ The relative position between the required position of the 22 disk and the 25 lower head is (■+■+■]-■, and the amount of (7o' 7u) is the amount of deviation, that is, the off-track amount, but for the 29th frame, for example, Even though it is made of a material with a stable thermal and humidity expansion coefficient, such as aluminum die-casting, if the 28-lower carriage is made of an unstable material such as plastic, which has a variable temperature and humidity expansion coefficient, The change in the 28 lower carriage of ' will vary greatly as indicated by diagonal lines (7tA and 7tt'k), and the off-track amount will vary in the range of (7o'a□o) and (71weight'b-y1)). become.

Similarly, in FIG. 5, for a certain temperature change, the relative positional relationship between the required position of disk 22 and the upper head 24 changes as follows.

■Change in 22 discs of φ”1) → 4...7°■
Changes in 29 frames of φxIf ---◆ ... Song 7tt
■ Pagekichi's 50 Lead Screw Changes Between Songs (71s 7t*)■
te ■, 28 lower career change ... Song/curved surface between songs (71) 71m
)■
1471)) ■ "14" 1) 25 upper carriage f)
7ta)■ The relative position of the 22nd disk and the 24th upper head is (■+■+■+■+■)-■9, (
7o' 7+t ) is the amount of deviation, that is, the amount of off-track.

However, although the 29 frame is made of a material with a stable expansion coefficient in temperature and humidity, such as die-cast aluminum, the upper carriage 25 and the lower carriage 28 are made of an unstable material, such as plastic, whose expansion coefficient in temperature and humidity varies. , the changes in the 28-lower carriage of

27 If the suspension is made of a material with stable thermal expansion and thermal contraction rates, such as metal, x14x, (7tsl
)7Ba)=(7xatl-7t4a) changes by the same rate. G) The changes in the 25 upper carriage of K x,,
7xt% and y
1) The amount of off-track will vary within the range #b.

Although the above explanation based on FIGS. 5 and 4 has been made with respect to changes in temperature environment, off-track occurs due to a completely similar mechanism in changes in humidity and soil conditions.

In this way, the above-mentioned conventional technology has been designed to stabilize the expansion and contraction of a magnetic recording device in response to the expansion and contraction of a disk made of mylar as a base material, for example, with regard to the performance of the magnetic recording device in a usage environment where temperature and humidity change. It is difficult to follow
The problem is that the recording/reproducing position on the disk becomes unstable, which hinders the ability to increase the capacity of magnetic recording devices.

The present invention is intended to solve these problems, and its purpose is to provide a magnetic recording device that maintains a stable recording/reproducing position on a disk in an environment of varying concentration and humidity. be.

[Means for solving problems]

The magnetic recording device of the present invention has a base material made of a material equivalent to the frame and a material having a coefficient of thermal expansion and a coefficient of humidity expansion similar to that of the frame, and a separate member that serves as a means for mounting the head on the base material. Nine, the first carriage, which is coupled with a head mounted;
It is characterized by comprising a second carriage.

[Effect]

According to the above-described configuration of the present invention, the expansion and contraction of the magnetic recording device is stably followed in response to the expansion and contraction of the disk due to flooding and changes in humidity, and the recording/reproducing position on the disk is stably determined.

〔Example〕

FIGS. 1 and 2 show an example of the present invention, in which approximately the upper half is a sectional view of the main part of the carriage, which is a means for mounting and moving the head, and they are the same. The lower half explains the amount of deviation between the required position of the disk in the carriage and the relative position of the head, that is, the amount of off-track, and
The axis represents the distance between each point, and the Y axis represents the amount of elongation between each point due to temperature change. A diagram explaining the temperature-off-track characteristic of the upper carriage, and a diagram explaining the temperature-off-track characteristic of the lower carriage. be.

In Figure 1 and about half of the wcz diagram, the turtle is on disk 2.
This is a motor that rotates the motor in the Q direction, and is fixed to a $57 frame made of die-cast aluminum or steel plate, for example. +2 is the lower carriage which becomes the first carriage, and 1) is used to mount the lower head 1) which is the first head.
The 0 lower head pedestal and the 9 upper carriage pedestal are integrally connected, and the structure is such that it can be slid in the direction of the pass mark by engaging with a means for rotating in the direction of the Q mark, such as a 14 lead screw. 5 is the upper carriage which becomes i@2 carriage,
In order to mount the upper head 5, which is the second head, it is integrally connected to the upper head pedestal 4 through the suspension 8, which is an elastic body, and the coupling body 7, and is fixed to the upper carriage pedestal 9, and the lower head 12 It has a structure that slides integrally with the carriage in the direction of mark 44.

This is a spring that pushes the 6I/i5 upper carriage to bring the 1) lower head into close contact with the 3 upper head via the disk 2.

In the above-mentioned magnetic recording device, the coefficient of thermal expansion (17±8] The members are generally made of a material having a thermal expansion coefficient corresponding to that of the two disks described above, and in the embodiment of the present invention, important members have the following construction.

■ The +5 frame is made of die-cast aluminum with a coefficient of thermal expansion similar to that of the above two discs, and the upper carriage is made of 15
The base material is aluminum material equivalent to the frame, 8 suspensions are connected by 7 joints at one end, and 4 upper heads made of a material such as plastic are connected at the other end at a position that matches the required position of the Itis upper head. The pedestal is integrally joined by means such as an outsert, and the S upper head is mounted.

■ The base material of the 12 lower carriage is the same aluminum material as the 13 frame, similar to the 5 upper carriage, and one end has a 9
The upper head pedestal is joined together, and at the other end 1) a lower head pedestal made of a material such as plastic is integrally joined by means such as an outsert at a position that matches the required position of the lower head; 1) It is equipped with a lower head.

According to the structure of the present invention described above, by using a stable material such as aluminum material with a stable coefficient of thermal expansion as the base material of the 12-lower carriage, it is possible to The relative positional relationship between the required position of the disk and 1) the lower head is determined as follows.

■Changes in 2 discs of Ti--song y1■Changes in 15 frames of ffi---+・River...y! ■Change in 1alJ-tossfuryu of η stone =→・・・・・・(y* 7
m)■ Positive 12 lower carriage change
4#Yaw"(7s' 7s)■
The required position of 2 disks and the relative position of 1) lower head are (
■＋■＋■)−■tona'), (7t' 7t)Q
The amount becomes the amount of deviation, that is, the amount of off-track.

Similarly, in the case of FIG. 1, the relative positional relationship between the required positions of the 2nd disk and the 5th upper head for a certain m degree change is as follows.

■ Change of 2 disks of φX -”' 7r■ φX
Changes in 15 frames of ,---...y! ■ Runo 1
4 Lead screw change 1°°・(7g-7t) ■
Changes in Ru's 12th lower carriage ”-* (71-71)
■ -i stone's 8 suspension changes -1 (7471)■ -η
Changes in the upper carriage of I
The required position of the 2nd disk and the relative position of the 5th upper head are (■
+■＋■Sheep■+■)-■ becomes (7s' 1B)
The amount becomes the deviation amount, that is, the off-track amount.

The above explanation based on FIGS. 1 and 2 has been made with reference to changes in the temperature and humidity environment, but even in changes in the humidity environment, if the 15 frame is made of a non-hygroscopic material such as aluminum, 4 Upper head pedestal, 7 Combined body, 9 Upper carriage pedestal,
10 Even if the lower head pedestal is made of a material such as plastic that has hygroscopic properties and expands and contracts due to changes in the humidity environment, the upper head and 1 ) The change in the position of the lower head can be ignored.

On the other hand, even if the base material of the 15th frame, the base material of the 5th upper carriage, and the base material of the 12th lower carriage are made of materials with varying coefficients of thermal expansion, such as plastic, if they are the same material,
Figure 1) ■ηe 7s7s 17471' and °$7t # 7171' in Figure 2 are approximately parallel diagrams, and there is little variation in the amount of off-track.

From the lower half of Figures 1 and 2, it can be seen that the base material of the 15th frame and 5th upper carriage, and the 12th lower carriage base material are made of materials with a coefficient of thermal expansion similar to that of the 2nd disk. Denote each expansion by constructing several times φy,
It is obvious that the off-track amount becomes smaller by parallel approximation to .

〔Effect of the invention〕

As described above, according to the present invention, the 17th carriage,
The second carriage is constructed using the same material as the frame as a base material, and the heads are mounted on one end by integrally connecting separate members as means for mounting the heads, and the other end of the second carriage is Due to the structure in which the first carriage is integrally coupled with the opening/closing means of the two carriages that are pivotally supported, unlike the conventional structure, it is possible to prevent temperature and humidity expansion of materials other than the frame, or even plastic, etc. Unlike when the carriage is made of materials with varying rates, variations in off-track amount due to environmental changes in temperature and humidity are eliminated.

Furthermore, even if the materials of the first carriage and the second carriage are not exactly the same as those of the frame, substantially the same effect can be obtained as long as they are made of materials with similar coefficients of expansion and humidity expansion.
The closer the material approximates the expansion rate and humidity expansion coefficient of the disk, the greater the effect will be, and the greater the degree of freedom in material selection.

As described above, the present invention can stably follow the expansion and contraction of the magnetic recording device in response to the expansion and contraction of the disk due to changes in the lagoon and humidity environment. Regarding the reproduction position, not only is compatibility with other such devices stabilized, but also the recording and reproduction position density can be improved, and a higher capacity of the magnetic recording device can be achieved.

Furthermore, the practical effects of the present invention are extremely large, such as a greater degree of freedom in material selection and the stable performance described above, which improves mass productivity.

[Brief explanation of drawings]

1 and 2 are diagrams for explaining the present invention, and the first
The upper half of the figure is a cross-sectional view of the main part of the carriage, and the lower half is a diagram illustrating the temperature-off-track characteristics of the upper carriage. Approximately the upper half of FIG. 2 is a V) rr plane view of the main part of the carriage that is the same as approximately the upper half of FIG. 1, and approximately the lower half is a diagram illustrating the temperature-off-track characteristics of the lower carriage. Figures 5 and 4 are diagrams explaining the conventional example, and
Approximately the upper half of FIG. 5 is a sectional view of the main part of a conventional carriage, and approximately the lower half is a diagram illustrating the temperature-off-track characteristics of the upper carriage. Approximately the upper half of FIG. 4 is a sectional view of the main part of a conventional carriage, and the approximately lower half is a diagram illustrating the temperature-off-track characteristics of the lower carriage. 2...Disk Ilm...Lower head pedestal 3
... Upper head 1) ... Lower head 4 ... Upper head pedestal 12 ... Lower carriage 5 ... Upper carriage 15 ... Frame or above

Claims (2)

[Claims] (1) A first carriage held by a frame and equipped with a moving means, and a second carriage disposed opposite to the first carriage and pivoted to the first carriage by means that can be opened and closed. In a magnetic recording device each equipped with a head for recording and reproducing, the first carriage;
A second carriage is constructed of a material equivalent to the frame as a base material, and a head is mounted on one end by integrally connecting separate members as means for mounting each head, and the other end of the second carriage is configured as a base material. A magnetic recording device characterized in that it is integrally coupled with the openable/closable means. (2) the first carriage and the second carriage,
2. The magnetic recording device according to claim 1, wherein the member is made of a material having a coefficient of thermal expansion and a coefficient of humidity expansion similar to that of the frame.