JPS6093673A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To obtain proper contact state and to reduce influences due to external noises by selecting the length of a medium sliding direction of a magnetic head supported by gimbals and the thickness of a medium vertical direction properly in a mini floppy disc device. CONSTITUTION:When the magnetic disc is rotated in an F direction, a different inclination theta is generated by dynamic frictional coefficient mu and shapes [height (h) and width (a)] among a magnetic disc 2, the 1st magnetic head 16 and the 2nd magnetic head 19. In order to keep stable contact between the magnetic disc 2 and the magnetic head 16, theta=0 deg. should be satisfied. If the magnetic disc 2 is inclined by theta from a rotation reference plane, frictional force F is acted along the surface of the disc, the magnetic head 19 is inclined by alpha from the disc surface as a reference. When there is no spacing between the magnetic disc 2 and the magnetic head 19, alpha=0 deg. and the formula I must be formed. Practically, theta-1-2 deg. and mu=0.3-1.0 and it is necessary to set up theta=2 deg. and mu=1.0 as their maximum values. When h/a<=0.48, stable head contact state can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic recording device, and is particularly applicable to a thin and compact mini-frozen disk F#.

[Background of the invention]

A magnetic recording device that drives a flexible magnetic disk (hereinafter referred to as Mechiia) generally includes a carriage on which a magnetic head is mounted, a stepping motor that slides the carriage, a guide shaft that slidably supports the carriage, and a disk that rotates the medium. It consists of a drive device, a media attachment/detachment mechanism, a position detection device, a motor, a head drive circuit, etc. On the other hand, the media is stored in a flexible case, so the entire media is soft and its dimensional accuracy is poor.When installing the media into the disk drive, the drive has all the functions such as guide grooves for the media, and the approximate position of the media. ! 'I decided to align the center hole r of the media in the disk with the hub of the drive unit, rotate the media, and record/playback. I try to do it. This method has problems with durability and storage stability as the media is severely damaged during handling or storage, but recently we have improved this problem. What is stored is being developed. In this case, since the hard case that protects the media is thick (approximately 3 to 5 mm thick), when the riBi head accesses the media, the hard case is overhanged and the access is made through the opening itt.

On the other hand, in order to downsize the device, the media width is made as small as possible, and the opening is as small as about 11W.

In the conventional example, the head support part is made into an identified head and the size is reduced.
Miniaturization has been achieved by adopting configurations that increase the slider quotient of the magnetic head, but the former does not have sufficient followability for the media, and the latter does not have sufficient followability for the media. Due to the high ^, the gimbal support surface becomes less than 16 mm with respect to the media contact surface, making it easy to off-track, resulting in unstable operation.The magnetic path length is long, making it susceptible to external noise, and it is expensive. ing.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a thin and conopact magnetic recording apparatus that has a magnetic head that is less affected by external noise and responds stably to a magnetic disk.

[Summary of the invention]

Good contact between the magnetic head and the medium can be achieved by appropriately selecting the shape t of the magnetic head supported on the Ginopal, the length in the sliding direction of the medium, and the thickness in the vertical direction of the medium.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a plan view of a magnetic disk drive device according to an embodiment of the present invention. FIG. 2 is a sectional view. In Fig. 1-2, 1 is a shear 7, and a panel 4 having an opening 3 for attaching and detaching a hard case 8 that holds a magnetic disk 2 in its front part is fully disposed. The eject lever 6 allows the hard case 8 to be completely attached to and removed from the cassette holder 7. At the center of the chassis 1, a flat motor 9 for rotationally driving the magnetic desk 2 of the hard case 8 is connected to a shaft 11 via a bearing lθ.
1CJ: A hub receiver 12 fixed to a shaft body 11, a hub 13 fitted with the hub receiver 12 and arranged in the center of the magnetic desk 2, are rotatably supported by a supporter 14. The magnetic disk 2 is held in the same position as the shaft body 11 of the flat motor 9.
It is configured to rotate with a rotating shaft. -Power, Shah 72
In the center, there is a first magnetic head 16 for reading data into and reading from the disk 2, and a carriage 17 that is slidably held by a guide shaft 21, 22.
A second m=
The head 19 is fully equipped and the head arm spring 20 allows the magnetic tester 2 to connect the first magnetic head 16 and the second magnetic head 1.
9 with a desired pressing force? I am doing it.

The carriage 17 is supported by a drive stepper 23 held on the chassis l by a support 33, with a gooey 24 interposed, and a steel belt 25 held by a spring 26 with appropriate tension.The rotation of the drive stepper 23 causes the guide shaft 21 .22. Guide shaft 21.22
is held on the shear 71 by retainers 27, 28°29. , 30 are 00 track sensors, which are seven sensors that detect all 0θ track positions on the magnetic disk 2 for reading and writing. 00 Traxse/Ser 30 is a light transmission type sensor, and the I/D controller 31 integrally arranged on the carriage 17 is operated by the transmission of light tS. In order to move the lever 34, the lever 34 is rotatably supported, and the adjustment screw 36 is
Equipped with 35 supports arranged with

Reference numeral 37 denotes a control unit, which is connected to electrical components disposed in the chassis l.

FIG. 3 shows the appearance of the hard case 8. An opening 38 is disposed in the node case 8 so that the heads of the carriage 17 and the head arm 18 are connected to the magnetic desk 2.
The opening 39 connects the hub 13 to the drive unit of the device. The opening 38 is a shutter (
(shown in the figure) is normally located behind the opening 38, and when the nose case 8 is inserted into the holder 7 and set, the holder 7
The slider 40 is connected to a locking part (not shown) installed in the device to open the shutter, and the magnetic surface of the internal magnetic tester 2 is exposed only when the device is inserted into the device.

Figure 4.5 shows the bonding details of the carriage part. One end of the head arm 18 is connected to the carriage 17 by a head arm spring 20.
The magnetic head 19 is held together with a support 41 by a plate spring 42r, and a head support 60 on which the magnetic head 19 of Moe 2 is mounted is adhesively held at the other end. 43 and 44 are conductors of each head, which are connected to the opening part 37 by conductive wires 45 and 46. The holder 7 has a lever 47 (!-), and when the hub 13 of the magnetic desk 2 of the hard case 8 is attached to the device, it comes into contact with the protrusion 48 and the head arm 18
It is made up of Fa, which moves up and down to form a path for the hard case 8. Reference numeral 49 denotes a roller, which is elastically brought into point contact with the guide shaft 21 by a deflection spring 50.

FIG. 6 shows r#ge of the head section. The first magnetic head 16 mounted on the carriage 17 will be explained. No.l
The second magnetic head 197 of the magnetic head 16T is elastically supported behind the cymbals 51+51M, and
The spherical seat 53 provided at the center bottom of the carriage 17
The shift pallet 51 is configured to be able to be slightly displaced around the contact point between the flat surface of the hinge 52 and the spherical seat 53. Reference numeral 54 designates a head cap, which is a shield plate made of Cu (fill) and is a conductor that prevents leakage magnetic flux from passing through from the outside, and also protects the head from the H2 spatial sound in the range in which the gimbal 51 is raised.

FIG. 7.8 is a plan view and a side view of the gimbal 51, showing the support structure. Shifpal 51 is made of BeCu I (lamb copper) and has a thickness of 30 to 100μ and has been used for a long time.
Bridge 5 in the theta direction (direction of movement of carriage 17)
55.56 and supports the head 16, and a region B supports the area ATh with the bridge 55.56i interposed therebetween.
It consists of

Since the shift pal 51 is bonded to the protrusion 59 formed in the collapse of the carriage 17 (height H11 width E area CI diagonal shaded area), it is possible to rotate the area A around the X axis. Bridges 55 and 56 are interposed around 71101, making it easy to rotate.

FIG. 9 (contact method between the lc magnetic disk 2, the first magnetic head 16, and the second magnetic head 19! IMk is shown).

As the magnetic disk rotates in the F direction in FIG. and the slope θ? which varies depending on the width a)? arise.

2 in Fig. 9, when the magnetic disk 2 receives a charge of P, the dynamic friction load resistance F of the magnetic disk (20 rotations of the disk is F=μP UIl, +1) at point p (rotation of the gimbal 51'). around the center), by the dynamic friction load resistance F, M-E5
illθ+hcosθ) μP's momenoto? On the other hand, as a reaction force of the load If,1' that the magnetic desk 2 receives, a force M' is received in the opposite direction to Ir1J and N1.

M' =: f-CoSU-11sin θ)p In this state, there is a portion where the magnetic disk 2 and the first magnetic head 19 do not come into contact (a spacing gap exists, and the head contact state is poor).

Therefore, in order to maintain stable contact without spacing, θ must be 20a.

FIG. 9 shows the state of contact between the magnetic disk 2, the first rJB magnetic head 16, and the second magnetic head 19. When the magnetic desk is tilted by θ with respect to the rotation reference plane as shown in Fig. 9, and the frictional force F acts along the media surface and stiffens by α with respect to the media surface, the Hibot 5
2', if pressure P acts on point R, then I#friction resistance F
Accordingly, the rotational moment to the shift pallet 51' is M=jl'・F=h'・μP2(-51nα+hcosα)μP, while the magnetic desk 2 receives a moment of rotation P
As the reaction force, M'=fly :(-CIIS(α10)-hslnla10I)-
P This state is a medical condition in which there is a part (spacing) where the magnetic desk 2 and the first magnetic head 19 do not come into contact, and the head contact is poor. °, 61', sM, and not 9.

Therefore, the experimental assumption of the insects has increased.
1' If we take a complete look at the movement, in practical terms, θ = 1 ~ 2 degrees. Then, μ20.3~
10, and in order to maintain compatibility with market media 2, it is necessary to set the maximum values, θ=2° and μ2, to 1.0, each of which is 0.48.

That is, by controlling the height of the head or the width a of the sliding surface within this range, it is possible to obtain an inexpensive head contact condition.

Practically speaking, the magnetic disk 2 is 3 inches long, the aperture @8 is chosen to be 11 inches wide, and the head height is 1.4 inches.
It has been established as below. This is because the head is low,
It has been experimentally confirmed that the magnetic path length is short and is less susceptible to external noise.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain good contact between the magnetic head and the flexible magnetic disk, and to obtain good performance in terms of magnetic recording and reproducing performance. It is.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a magnetic recording device according to the present invention, FIG. 2 is a longitudinal cross-sectional view, and FIG.
, FIG. 4 is a plan view of the carriage and head arm, FIG. 5 is a sectional view of this, FIG. 6 is a sectional view of the head support portion of the carriage, FIG. No. 6 in Figure 7
A sectional view at right angles to the figure, FIG. 9 shows the magnetic test and the first.
A sectional view showing the state of contact with the second magnetic head, and FIG. 10 is an enlarged view of the thick part. l... Chassis, 2... Magnetic desk, 4... Panel, 8... Hard case, 9... Flat motor, lO
...Bearing part, 13...Huff, 16...First magnetic head, 17...Carriage, 18...Head arm, 19...Second magnetic head, 21.22...・Guide shaft, 25... Chopsticks 1 Fig. 3 Fig. δ 4θ No. 4-I21 A Fig. 5 ￥ K Fig.

Claims (1)

[Scope of Claims] 1. Information No. 11 is written and read on a flexible magnetic desk that has a plurality of trunks in a concentric manner, and has a magnetic head that is rotatably supported on a shift pal. A magnetic recording button characterized in that the quotient h of the head and the width a of the magnetic head in contact with the magnetic tape are set to h/a≦0.48 [2, Claim 1 Vc2 A magnetic recording device having a t% characteristic of 1151.4.