JPH04283647A - Method and apparatus for analyzing flotation quantity of magnetic disk head slider - Google Patents

Abstract

PURPOSE:To conserve a calculation time by determining the flotation posture of a slider from three kinds of quantities, that is, the flotation quantity of the slider at an indicated point, the pitching angle or height of the slider at the time of flotation and the rolling angle or height of the slider at the time of flotation. CONSTITUTION:The shape of a slider, the shape of a medium surface, the load condition to the slider, a medium surface running condition, the position and direction of the slider and the posture parameter approximate value of the slider are inputted or set. Next, the floatation gap distribution of the slider, gap internal pressure distribution and slider load characteristics are calculated according to a predetermined formula and, subsequently, it is judged whether the load condition and the load characteristics coincide within an error range and, in the case of non-coincidence, the correction of a posture altering parameter is performed and, in the case of coincidence, the floatation posture of the slider is determined from three kinds of quantities, that is, the floatation quantity of the slider at an indicated point, the pitching angle or height of the slider at the time of flotation and the rolling angle or height of the slider at the time of flotation. By this constitution, a calculation time can be conserved.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for analyzing the flying height of a magnetic disk head slider, and in particular to a trial method for designing a head slider shape that satisfies a specified flying height in magnetic disk drives and floppy disk drives. Concerning analytical methods to improve convergence in errors

[0002].

[Prior Art] A magnetic disk head slider has an extremely small gap (currently generally 0) on a rotating disk.
．． 1 to 0.3 μm), and this gap is becoming smaller as technology advances. In order to keep this gap constant and stable against various impacts, it is necessary to pay close attention to the design of the shape of the slider. The reason for this is that a difference in shape of about 0.01 μm on the slider surface causes a difference in flying height of several percent, which may lead to information input/output errors.

[0003] Conventionally, the flying characteristics of a slider have been described in the literature (1).
．． Mitsuya et al. “Tsuken Practical Application Report” Vol. 26. No2p
．． 415, (1977). Literature (2). Odaka et al., Ultra-fine levitation analysis of floating head slider (solution method using finite element method), Transactions of the Japan Society of Mechanical Engineers, C edition, vol. 52, no. 495, p. 1047 (1986)
. Literature (3). Fukui, S. In addition, Analysis
of Ultra thin Gas Film L
Ubridation Based on Linea
rigged Bolzman Equation, AS
ME Pepar No. 87-Trib-14 (19
87). Literature (4). Kubo, M. In addition, Finite El
element Solution for Rarefi
edGas Lubrication Problem
m, ASME Paper No. 87-Trib-2
4 (1987). Set the slider shape and flying posture (for example, the minimum flying clearance and the pitching angle and rolling angle of the slider) using the method shown in The basic equation (partial differential equation, nonlinear) that defines the pressure due to
The pressure distribution is used to calculate the bearing performance (load capacity and pressure center position) of the slider, and this is done for various slider floating positions to accumulate data and calculate the load on the slider. The method used was to find a levitation posture that satisfied the conditions. Load conditions vary depending on the design situation, but mean, for example, that the load on the slider and the load position are specified, or that the flying height and support position at a particular position of the slider are specified.

[0004] In the conventional method, since the levitation attitude is set in advance, it is not easy to determine the load condition, that is, the levitation attitude when a load or a load position, or both are specified at the same time. The reason for this is that the basic equation expressing the pressure distribution is nonlinear and extremely sensitive to minute changes in the gap.

In actual slider design, the flying height at a specific position of the slider, such as the head position and the slider support position by the support mechanism are given, and a step is taken to determine the shape of the slider that satisfies these conditions, or the support In many cases, the load applied to the slider from the mechanism and the load position are set, and a slider shape that satisfies these requirements is determined. An outline of calculating the flying attitude in this case is shown in the above document (1) or the following document (5). Literature (5). Tagawa et al., Mechanism Theory No. 860-4.

[0006]

[Problems to be Solved by the Invention] The above-mentioned prior art gives sufficient consideration to a method for ensuring convergence and a method for saving the number of iterations when calculating the slider flying posture given load conditions through repeated calculations. Therefore, the convergence of iterative calculations to determine the slider posture is insufficient, and it often does not converge, especially when the slider has a complicated shape such as a negative pressure slider, or when the slider has a Yaw angle in the running direction.
Unable to calculate accurate levitation attitude. Another problem is that the calculation cost is high. It is expected that the slider shape will become more complex as recording density increases, and it has been desired to establish a method for calculating the slider posture under given loading conditions.

[0007] An object of the present invention is to reliably, accurately, and quickly determine the flying posture of a slider given load conditions, thereby facilitating slider design and reducing calculation costs. An object of the present invention is to provide a flying height analysis method and system for a magnetic disk head slider.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following features:
From the load conditions, magnetic disk running conditions, etc.
In the method for analyzing the flying height of a magnetic disk head slider for determining the flying attitude of the slider, there are three steps: the flying height at a specified point of the slider, the pitching angle or height, and the rolling angle or height when the slider is flying. The present invention is characterized in that the floating attitude of the slider is determined from the amount of seeds.

[0009] Also, the shape of the slider of the magnetic disk head, the load on the slider and its load position, the speed of the magnetic disk and the relative direction angle with the slider, the number of revolutions per unit time of the disk, or the radius where the slider is located. From the position and angle with respect to the slider rotation direction, etc.
The minimum flying height of the slider or the flying height of the head,
and a flying height analysis method for a magnetic disk head slider that determines the flying attitude of the slider, which is comprised of a pitching direction angle, a rolling direction angle, etc. of the slider, the distance from the disk surface at a specified position of the slider;
The slider is characterized in that a correction means is provided for three types of amounts: a pitching angle or height and a rolling angle or height when the slider is floating, and the flying attitude of the slider is determined by correcting the three types of amounts. It is.

[0010] Further, there is provided means for correcting three types of quantities: the distance between the slider and the disk surface at the designated position, the pitching angle or height when the slider is flying, and the rolling angle or height. The correction means is characterized in that it determines the flying attitude of the slider using a solution of a variational equation for each parameter of a basic equation that defines the pressure distribution of the slider.

[0011] Further, there is provided means for correcting three types of quantities: the distance between the slider and the disk surface at the specified position, the pitching angle or height when the slider is flying, and the rolling angle or height. The correction means is characterized in that it determines the floating attitude of the slider based on the load capacity of the slider and the sensitivity of the pressure center position when the attitude of the slider is minutely changed.

[0012] Further, there is provided means for correcting three types of quantities: the distance between the slider and the disk surface at the specified position, the pitching angle or height when the slider is flying, and the rolling angle or height. The correction means assumes that the load capacity and pressure center position of the slider are a function or polynomial of a parameter that determines the attitude of the slider, and that the unknown constant of the polynomial is calculated by changing the load capacity obtained by changing the flying attitude a necessary number of times. The floating attitude of the slider is determined based on the approximate function or polynomial obtained from the relationship between the pressure center position and the pressure center position.

Furthermore, the shape of the slider of the magnetic disk head, the load on the slider and its load position, the speed of the magnetic disk and the relative direction angle with the slider, the number of revolutions per unit time of the disk, or the radius where the slider is located. A magnetic disk that determines the flying posture of the slider, which is the minimum flying height of the slider or the flying height of the head portion, and the pitching direction angle, rolling direction angle, etc. of the slider, based on the position and angle with respect to the slider rotation direction. In a head slider flying height analysis system, (a) means for expressing the running surface and disk surface shape of the slider and means for setting or inputting the data, and (b) parameters expressing the flying attitude of the slider with respect to the disk surface. and (c) a gap distribution between the slider and the disk surface for an arbitrary flying attitude using the flying attitude specification parameters of the slider. (d) means for calculating the pressure distribution generated in the gas film in the gap between the slider and the disk surface when the slider is in an arbitrary flying posture; and (e) calculating the pressure distribution of the slider from the pressure distribution. means for calculating load characteristics such as load capacity and pressure center position, (f) means for expressing the relationship between the load characteristics and the flying attitude parameter of the slider, and (g) means for calculating the load and (h) means for determining whether the load characteristics match load conditions such as the magnitude of the load applied to the slider and the load position; (li) When the load conditions do not match the load characteristics, a means for determining the correction amount of the slider posture and correcting or directly calculating the slider posture using the correction amount, and (v) when the load conditions do not match the load characteristics. The present invention is characterized by having means for outputting or displaying information such as the floating attitude of the slider, the load capacity, and the position of the center of pressure.

In addition, (l) when the load condition does not match the load characteristic, the amount of correction of the slider attitude is determined, and the distance between the slider and the disk surface is again adjusted for the flying attitude corrected by the amount of correction. A control means for repeating the steps after the means for calculating the gap distribution, (w) after outputting or displaying information such as the flying posture of the slider, load capacity, and pressure center position when the load conditions match the load characteristics; , a control means that checks whether there is a request for continued processing, and when there is such a request, performs the steps after the expression means for the running surface and disk surface shape of the slider and the data setting or input means; (iv) the load; After outputting or displaying information such as the slider's flying posture, load capacity, and pressure center position when the conditions match the load characteristics, it is checked to see if there is a request for continued processing, and if there is no such request, the necessary parts of the main system are control means, etc. to return control to (
F) The method is characterized in that a series of these measures are carried out continuously.

[0015]

[Operation] According to the above configuration, when a load condition on a slider (load size, load position, etc.) is specified, in a problem of determining a slider floating posture that satisfies the specified load condition, the load condition and floating posture are specified. The method of determining a flying posture that satisfies a given load condition by expressing the relationship with the parameters using sensitivity to the parameters or as a relational expression using the parameters is in accordance with general approximation theory. In this patent, the sensitivity or the relational expression is calculated using a value predicted with high accuracy by theoretical calculation, so that the floating attitude of the slider can be determined with high accuracy in a short time.

[0016] The working principle of the present invention will be explained below in terms of (1) to (
8) will be explained in more detail.

The flying clearance between the medium surface and the slider is
Since the medium surface and the slider are different objects, generally the shape of each object is expressed in a separate coordinate system fixed to each object, and the overall coordinate system that includes both objects (which does not lose generality as it is stationary) Considering this, the amount of parallel movement that indicates the position of both objects relative to the global coordinate system, that is, the position of the object coordinate system (which can also be used as the origin of each coordinate system without loss of generality) relative to the global coordinate system. , and the amount of rotation that indicates how much the object coordinate system is rotated with respect to the three axes of the global coordinate system, express the opposing parts of both objects in terms of the global coordinate system, and find the difference. Bye. Generally, the number of parameters expressing the attitude of one object is six. However, as will be described later, if three of these parameters are specified in advance, the number of parameters expressing the attitude of the object may be considered to be three.

The coordinate system may be set in any way, but since we are concerned with the flying characteristics and load characteristics of the slider caused by the pressure of the gas film generated on the slider running surface, it is necessary to convert it to the slider coordinate system. It is better to consider a simple coordinate system. Therefore, as a coordinate system for the slider, as shown in FIG. 1, a general method is shown in which the plane substantially parallel to the running surface is set as the X'-Y' plane, and the Z' axis is set in the direction opposite to the medium plane. The medium surface coordinate system is a coordinate system in which the axis of rotation is the Z'' axis, and the area near the surface of the medium surface perpendicular to this is the X''-Y'' plane. It is assumed that the plane giving the average height of the surface is the X-Y plane, and the slider coordinate system is directly translated in parallel to the portion facing the slider.

(1) First, the slider shape and medium surface shape are expressed. If we take the coordinate system as above, the slider shape can take any shape as shown in Figure 1, but it is not necessary to give the entire shape, and the part facing the medium surface as shown in Figure 2. It is only necessary to express the shape of . Similarly, the shape of the medium surface may be expressed over the entire surface, or only the portion facing the slider may be expressed. When the entire surface is expressed, the portion facing the slider at the current time is extracted again.

These shapes can be expressed, for example, as follows for the slider and medium surface, respectively.

[0021]

[Math. 1] S's (X', Y', Z') S"m (X", Y", Z"; T) However, X', Y', Z' are the coordinate system fixed to the slider. Yes, and X", Y", and Z" are coordinate systems fixed to the medium surface. T represents time. There is surface roughness in the shape of the slider and the shape of the medium surface, and when expressing this faithfully, , it may be displayed as is as a function or finite element data.

(2) As mentioned in (1), the flying attitude of the slider can usually be expressed by six parameters. These are the amount of translation (Xo, Yo, Zo) and rotation (θx, θy, θ) of the slider coordinate system with respect to the global coordinate system.
z). When taken in another coordinate system, there may be other parameters, but basically there are still six parameters, and the following discussion holds almost in the same way.

The shape of the slider running surface when the slider is floating above the medium surface is expressed in the global coordinate system by the following equation 2.
It is expressed as

[0024]

[Math. 2] Ss (X, Y, Z) = Π (Xo, Yo, Zo, θx, θy, θz)
S's(X', Y', Z')Π is parallel movement (Xo, Y
o , Zo ) and rotation (θx , θy , θz )
This is the transformation matrix from the slider to the entire system with . Here, since S' is the slider surface, it is assumed that it represents each point (X', Y', Z') on the slider surface. On the slider running surface, X', Y
Z' is considered to be sufficiently small compared to '. θx
, θy may also be sufficiently small. Further, θz may be considered to be fixed as a Yaw angle with respect to the direction of travel of the medium surface of the slider.

[0025] At this time, the traveling planes X', Y', and Z' of the floating slider in the global coordinate system are approximated as shown in Equation 3 by omitting minute terms of second order or higher. be able to.

[0026]

[Math 3] X≒X'+ Xo - θyX'Y≒Y'+
Yo - θxY'Z≒Z'+ Zo - θyX'+ θxY' In the first and second equations of Equation 3, the third term on the right side is sufficiently small compared to the others, so it is omitted, and the running surface Z of the slider is expressed as hf (x,
Y), it can be expressed as the following Equation 4.

[0027]

[Formula 4] hf(X,Y)=Z'+Zo-θy(
X-Xo) + θx(Y-Yo) In formula 4, Z' is a one-way coordinate value of Z' in the shape of the slider that is unrelated to levitation, so this is expressed as hs (X, Y), and Zo is due to levitation. Since it is a Z unidirectional coordinate value, when expressed as ho, the running surface hf (x, Y) of the slider can be expressed as the following Equation 5.

[0028]

[Formula 5] hf (X, Y) = hs (X, Y) + ho - θy (X - Xo)
+θx(Y-Yo) Note that in order to express the running surface of the slider more accurately than Equation 5, X', It is sufficient to substitute it into Y', and if it is desired to obtain more accurately, it is sufficient to go back to equation 2 and calculate Z, that is, hf (X, Y). The medium surface can also be expressed in the same way using the global coordinate system, but since the global coordinate system is set parallel to the medium surface coordinate system, the following formula 6 is used.
It can be expressed as

[0029]

[Formula 6] hg = hm (X, Y; T) + hmohmo
is the amount of parallel movement between the global coordinate system and the medium plane, and hmo
If the global coordinate system is set so that =0, the medium surface can be expressed by the following equation 7.

[0030]

hg = hm (X, Y; T) where T is time, and hm (X, Y; T) represents the shape of the surface of the medium surface that exists in the portion facing the slider at the time. Since the subject here is not to obtain Tm (X, Y; T) at time T, it is assumed that hm (X, Y; T) is a substantially flat and constant value. Note that when the shape of the medium surface changes with time, the medium surface coordinate system S''m (
X'', Y'', Z'') in the global coordinate system Sm (X, Y
, Z) and calculate the part facing the slider as H
Let m (X, Y, Z).

At this time, if the gap between the slider and the medium surface is h(X, Y), then the following equation 8 is obtained.

[0032]

[Formula 8] h (X, Y) = hf (X, Y) - hm (X, Y;
T) =hs(X,Y)+
ho -θy(X-Xo)+θx(Y-Yo)
-hm (X, Y; T) Here, since hs (X, Y) and hm (X, Y; T) are constant, the parameter that specifies the slider floating attitude is shown in the following equation 9. be.

[0033]

[Formula 9] Xo, Yo, ho, θy, θxXo, Yo, h
Since o is the origin of the slider coordinate system expressed in the global coordinate system, the following equation 10 is obtained from the coordinate system definition.

[0034]

[Equation 10] Xo = 0, Yo = 0 Even in this way, any point on the slider coordinate system (Xo
, Yo) without loss of generality. Here, this method will be adopted and explained. Since (Xo, Yo) may be a fixed point, there are essentially three parameters as shown in Equation 11 below.

[0035]

[Formula 11] ho, θy, θx Below, for convenience of explanation, it will be expressed as the following equation 12.

[0036]

[Formula 12] ho , φ, ψ Here, ho ...Z in the slider (Xo, Yo)
Amount of directional translation φ=-θy ψ=θx (3) Since the relative gap between the slider and the medium surface is the distance between the slider surface and the medium surface, it is expressed as the following equation 13.

[0037]

[Formula 13] h(X,Y)=hs(X,Y)+φ(X-Xo)+
ψ(Y-Yo) +h
o -hm (X, Y; T)
=h(X,Y;ho,φ,ψ)Here, Xo,Y
o ...... Fixed β = θz ...... Yau When considering the fixed static characteristics, the following formula 14 can be considered without loss of generality.

[0038]

[Equation 14] hm (X, Y; T) = hmo = constant Then, if ho = hm is replaced by ho, the relative gap h (X, Y) between the slider and the medium surface becomes the following equation 15.

[0039]

[Formula 15] h (X, Y) = h (X, Y; ho, φ, ψ)
=hs(X,Y)+φ(X-
Xo)+ψ(Y-Yo)+ho (4) Pressure distribution P(X, Y) at any levitation posture is
Calculate using Documents (1) to (4) or an equivalent method. In other words, the pressure distribution P(X, Y) is based on documents (1) to (4)
It is numerically determined as a solution of the following equation 16, which generally describes the basic equation in .

[0040]

[Equation 16] ∇・[F(h,p)∇p−UQ(h)hp]=0 Here, Equation 17 is given.

[0041]

[Math. 17]

[0042] Solving methods include the finite element method, the finite difference method, and the Diver
There are the gence formulation method, the series solution method, and the like, and any of these methods may be adopted.

(5) Load characteristics of the slider when pressure distribution is given (load capacity W and pressure center (Xc, Y
c)) is expressed by the following formula 1 using the pressure distribution P(X, Y)
Calculate as 8.

[0044]

[Math. 18]

Here, the integral is an integral over the entire running surface of the slider (including the entire pressure generating surface and negative pressure). The actual integration is numerical integration, and is calculated by the FEM method or the difference method.

(6) If Wo, Xco, Yco are the load characteristics of the slider when the slider posture (hoo, φo, ψo) is given, then the following equation 19 is obtained.

[0047]

[Formula 19] Wo = W (hoo, φo, ψo)X
co =X(hoo, φo, ψo)Yco =Y
(hoo, φo, ψo) One way to determine whether the load conditions for the slider match the load characteristics of the slider in a given flying posture is to satisfy the following equation 20.

[0048]

[Formula 20] F=W Xf = Xc Yf=Yc Alternatively, give an error range and execute using the following equation 21.

[0049]

[Equation 21] |F−W|<ε |Xf−Xc|<εx |Yf−Yc|<εy Alternatively, the following Equation 22 may be used as a similar condition.

[0050]

[Math. 22]

In some cases, the determination may be made based on whether the required correction amount of the flying attitude parameter falls within the error range.

(7) In (6), when the load conditions and the load characteristics do not match, the flying attitude parameters (hoo, φo, ψo) of the slider change by minute amounts (Δho, Δ
The load characteristics when changed by φ, Δψ) can be expressed as shown in Equation 23 below.

[0053]

[Math. 23]

Here, the sensitivity of the load characteristic to minute changes in the flying attitude parameter is expressed by the following equation 24.

[0055]

[Math. 24]

There are several methods for calculating the amount (Equation 24) corresponding to the sensitivity of the load characteristics to minute changes in the flying posture, but the method using the solution of the variational equation shown below is the most theoretical and accurate. .

Incidentally, the term "variational equation" is usually defined for ordinary differential equations. Since no suitable term could be found for partial differential equations as in this patent, the term variational equation will be used here. Equation 28, which will be described later, with respect to Equation 16 is collectively referred to as Equation 28.

Since the pressure distribution P(X, Y) differs depending on the flying posture of the slider, it can be expressed by the following equation 25.

[0059]

[Equation 25] P=P(X, Y; ho , φ, ψ) The amount of change in pressure distribution when the flying posture (ho , φ, ψ) is slightly changed is given by the following equation 26.

[0060]

[Math. 26]

[0061] If formula 26 is obtained, load capacity sensitivity formula 24
can be calculated using the following equation 27.

[0062]

[Math. 27]

[0063] Furthermore, G1=P ho =∂P/∂ho,
G2=Pφ=∂P/∂φ, G3=Pψ=∂P/∂ψ are the variational equations regarding the parameters of Equation 16 (obtained by partially differentiating Equation 16 with respect to the parameters) as shown in Equation 28 below. equations).

[0064]

[Math. 28]

Here, the following Equation 29 is satisfied, and P is Equation 1
Use solution 6.

[0066]

[Math. 29]

Equation 28 has a similar type to the equation for calculating the pressure distribution correction amount ΔP when calculating the solution to Equation 16 by the iterative solution method, and is one of the processes for calculating the pressure distribution correction amount ΔP (X, Y). can be easily obtained by changing (the right-hand side of the basic equation).

(8) Substituting the sensitivity coefficient obtained in Equation 27 into Equation 23, the slider attitude correction amount Δho, Δφ,
Δψ can be calculated.

The flying attitude is changed by adding the correction amount obtained above to the initial assumed value. That is, according to the following equation 30.

[0070]

[Equation 30]ho = hoo +Δho φ=φo +Δφo ψ=ψo +Δψo Note that the above procedure may be integrated to obtain the slider flying attitude parameter after adding a correction amount. At this time, formula 23
Substituting the following equation 31 into , ho to the (n+1) power, φ to the (n
+1) power, and ψ to the (n+1) power, can be obtained in an integrated form by adopting a method of directly obtaining the (n+1) power.

[0071]

[Math. 31]

[0072]

Embodiments Several embodiments of the present invention will be described below with reference to FIGS. 3 to 6.

(First Embodiment) FIG. 3 is a block diagram of the first embodiment. slider shape, media surface shape, load conditions on the slider, media surface running conditions, slider position,
After inputting or setting data such as the direction and approximate values of slider posture parameters, perform steps such as calculating the slider flying clearance distribution using Equation 15, calculating the pressure distribution in the gap using Equation 16, and calculating the slider load characteristics using Equation 18. Then, it is determined whether the load condition and the load characteristics match within the error range. If they do not match, the load condition is determined by formulas 23 and 30 through the relational expression between the levitation posture and the load characteristics or the sensitivity calculation formula 27. Posture change parameter correction is performed so as to satisfy the following, and the calculation steps below using Equation 15 are performed again. If the load conditions and load characteristics match within the error range, the necessary information is output, and eventually, depending on the presence or absence of next data, the process returns to the initial data setting or ends.

(Second Embodiment) FIG. 4 shows a second embodiment of the present invention. This embodiment is a case in which a method of directly obtaining a new flying attitude after correction is adopted. In other words, in the first embodiment, the attitude change that satisfies the load condition is calculated using Equation 2.
3 and 31 directly.

(Third Embodiment) FIG. 5 shows a third embodiment of the present invention. In this embodiment, the sensitivity of the load characteristics to the parameters of the flying posture is determined by numerical approximation. In other words, the sensitivity of the slider load characteristics to minute changes in the slider posture is calculated by actually changing the parameters slightly, and using the characteristic values before the change, the following equation 3 is calculated.
It is calculated as shown in 2.

[0076]

[Math. 32]

(Fourth Embodiment) FIG. 6 shows a fourth embodiment of the present invention. In Figures 3 to 5, three load conditions (load f,
In this case, the load position (Xf, Yf) is given and three levitation attitude parameters that satisfy this are found, but in some cases, only two or one of the three load conditions are specified and the remaining One or two parameters may specify a floating attitude parameter. For example, load position (Xf, Y
For example, only the flying height ho of f) and (Xo, Yo) is given. In this case, the levitation attitude parameters to be determined are only φ and ψ, and the load pressure center position (X
c, Yc) to match (Xf, Yf),
This will determine φ and ψ. In such a case, the present system is exactly the same, and in equations 22 and 30, the unknown parameters are set to φ and ψ, and unnecessary equations are removed.

In addition to the above methods, parameter sensitivity can be determined by numerically approximating from the load characteristics when changing parameters, or by using any interpolation formula such as linear interpolation, polynomial interpolation, spline interpolation, etc. However, the use of these is also included in the present invention.

[0079]

[Effects of the Invention] According to the present invention, the flying attitude of the slider can be found by repeating calculations several times even when it is impossible to find it using normal methods, resulting in a significant saving in calculation time. . Moreover, the slider shape can be designed easily, and the slider development and design time can be significantly saved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the shape of a slider handled by the system according to the present invention.

FIG. 2 is a perspective view showing an example of the running surface of the slider in FIG. 1 and an example of coordinates fixed on the slider.

FIG. 3 is a block diagram of a first embodiment of the invention.

FIG. 4 is a block diagram of a second embodiment of the invention.

FIG. 5 is a block diagram of a third embodiment of the present invention.

FIG. 6 is a block diagram of a fourth embodiment of the present invention.

Claims (11)

[Claims] 1. A method for analyzing the flying height of a magnetic disk head slider that determines the flying posture of the slider from the shape of the slider of the magnetic disk head, load conditions, running conditions of the magnetic disk, etc. Floating a magnetic disk head slider, characterized in that the flying attitude of the slider is determined from three types of quantities: a flying height at a point, a pitching angle or height, and a rolling angle or height when the slider is flying. Quantitative analysis method. 2. The shape of the slider of the magnetic disk head, the load on the slider and its load position, the speed of the magnetic disk and the relative direction angle with the slider, the number of revolutions per unit time of the disk, or the radius of the slider. A magnetic disk that determines the flying posture of the slider, which is the minimum flying height of the slider or the flying height of the head portion, and the pitching direction angle, rolling direction angle, etc. of the slider, based on the position and angle with respect to the slider rotation direction. A head slider flying height analysis method includes correction of three types of quantities: the distance between the slider and the disk surface at a specified position, the pitching angle or height when the slider is flying, and the rolling angle or height. A method for analyzing the flying height of a magnetic disk head slider, characterized in that a means is provided and the flying attitude of the slider is determined by correcting the three types of amounts. 3. The shape of the slider of the magnetic disk head, the load on the slider and its load position, the speed of the magnetic disk and the relative direction angle with the slider, the number of revolutions per unit time of the disk, or the radius of the slider. A magnetic disk that determines the flying posture of the slider, which is the minimum flying height of the slider or the flying height of the head portion, and the pitching direction angle, rolling direction angle, etc. of the slider, based on the position and angle with respect to the slider rotation direction. A head slider flying height analysis method includes correction of three types of quantities: the distance between the slider and the disk surface at a specified position, the pitching angle or height when the slider is flying, and the rolling angle or height. A flying height of a magnetic disk head slider, characterized in that the correction means determines the flying attitude of the slider using a solution of a variational equation for each parameter of a basic equation that defines the pressure distribution of the slider. analysis method. 4. The shape of the slider of the magnetic disk head, the load on the slider and its load position, the speed of the magnetic disk and the relative direction angle with the slider, the number of revolutions per unit time of the disk, or the radius of the slider. A magnetic disk that determines the flying posture of the slider, which is the minimum flying height of the slider or the flying height of the head portion, and the pitching direction angle, rolling direction angle, etc. of the slider, based on the position and angle with respect to the slider rotation direction. A head slider flying height analysis method includes correction of three types of quantities: the distance between the slider and the disk surface at a specified position, the pitching angle or height when the slider is flying, and the rolling angle or height. A magnetic disk head slider, characterized in that the correcting means determines the flying attitude of the slider based on the load capacity of the slider and the sensitivity of the pressure center position when the attitude of the slider is minutely changed. Flying height analysis method. 5. The shape of the slider of the magnetic disk head, the load on the slider and its load position, the speed of the magnetic disk and the relative direction angle with the slider, the number of revolutions per unit time of the disk, or the radius of the slider. A magnetic disk that determines the flying posture of the slider, which is the minimum flying height of the slider or the flying height of the head portion, and the pitching direction angle, rolling direction angle, etc. of the slider, based on the position and angle with respect to the slider rotation direction. A head slider flying height analysis method includes correction of three types of quantities: the distance between the slider and the disk surface at a specified position, the pitching angle or height when the slider is flying, and the rolling angle or height. The correction means assumes that the load capacity and pressure center position of the slider are a function or a polynomial of a parameter that determines the attitude of the slider, and changes the flying attitude a necessary number of times by using an unknown constant of the polynomial. A method for analyzing the flying height of a magnetic disk head slider, characterized in that the flying attitude of the slider is determined based on the approximate function or polynomial obtained from the relationship between the load capacity and the pressure center position obtained from the relationship. 6. A flying height analysis system for a magnetic disk head slider using the analysis method according to any one of claims 1 to 5. 7. The shape of the slider of the magnetic disk head, the load on the slider and its load position, the speed of the magnetic disk and the relative direction angle with the slider, the number of revolutions per unit time of the disk, or the radius of the slider. A magnetic disk that determines the flying posture of the slider, which is the minimum flying height of the slider or the flying height of the head portion, and the pitching direction angle, rolling direction angle, etc. of the slider, based on the position and angle with respect to the slider rotation direction. In a head slider flying height analysis system, a means for expressing the running surface and disk surface shape of the slider, a means for setting or inputting the data, and a parameter expressing the flying attitude of the slider with respect to the disk surface are specified, and the A means for expressing a flying attitude and a means for setting or inputting the data; a means for calculating a gap distribution between a slider and a disk surface for an arbitrary flying attitude using flying attitude designation parameters of the slider; means for calculating the pressure distribution generated in the gas film in the gap between the slider and the disk surface when in an arbitrary floating posture; and means for calculating the load characteristics such as the load capacity and pressure center position of the slider from the pressure distribution. , a means for expressing the relationship between the load characteristic and the flying attitude parameter of the slider, a means for calculating a quantity corresponding to the sensitivity of the load and load position to minute changes in the flying attitude parameter, and means for expressing the relationship between the load characteristic and the flying attitude parameter of the slider. means for determining whether or not the load conditions such as the magnitude of the load and the load position match, and when the load conditions do not match the load characteristics, the amount of correction of the slider posture is determined, and the amount of correction is used to It is characterized by having means for correcting or directly calculating the slider attitude, and means for outputting or displaying information such as the slider's floating attitude, load capacity, and pressure center position when the load conditions match the load characteristics. Flying height analysis system for magnetic disk head sliders. 8. The system according to claim 7, when the load condition does not match the load characteristic, a correction amount of the slider attitude is determined, and the slider and disk are adjusted again for the flying attitude corrected by the correction amount. A flying height analysis system for a magnetic disk head slider, comprising a control means for repeating the steps subsequent to the means for calculating the gap distribution between the magnetic disk head slider and the surface. 9. The system according to claim 7, after outputting or displaying information such as the floating posture of the slider, load capacity, and pressure center position when the load conditions match the load characteristics, a request for continued processing is issued. A magnetic disk head slider characterized in that the magnetic disk head slider is provided with a control means for checking the presence or absence of the slider and performing the steps subsequent to the means for expressing the running surface and disk surface shape of the slider and the data setting or input means again when the request is made. floating height analysis system. 10. The system according to claim 7,
After outputting or displaying information such as the floating posture of the slider, load capacity, and pressure center position when the load conditions match the load characteristics, it is checked whether there is a request for continued processing, and if there is no such request, the main system is A flying height analysis system for a magnetic disk head slider, characterized by comprising a control means for returning control to a necessary point. 11. A flying height analysis system for a magnetic disk head slider, which continuously implements a series of means provided in the system according to claims 7 to 10.