WO1990010289A1 - Suspension system for magnetic heads - Google Patents

Suspension system for magnetic heads Download PDF

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Publication number
WO1990010289A1
WO1990010289A1 PCT/FR1990/000125 FR9000125W WO9010289A1 WO 1990010289 A1 WO1990010289 A1 WO 1990010289A1 FR 9000125 W FR9000125 W FR 9000125W WO 9010289 A1 WO9010289 A1 WO 9010289A1
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WO
WIPO (PCT)
Prior art keywords
head
suspension
magnetic
magnetic head
flanges
Prior art date
Application number
PCT/FR1990/000125
Other languages
French (fr)
Inventor
Aimé OVADIA
Guy Max Claude Roulleau
Original Assignee
Kodak-Pathe
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kodak-Pathe filed Critical Kodak-Pathe
Publication of WO1990010289A1 publication Critical patent/WO1990010289A1/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/01—Details
    • G06K7/015—Aligning or centering of the sensing device with respect to the record carrier
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
    • G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
    • G06K7/083—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive
    • G06K7/084—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive sensing magnetic material by relative movement detecting flux changes without altering its magnetised state
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following

Definitions

  • the invention relates to a magnetic reading and recording system and more particularly to a magnetic head suspension enabling uniform contact between the magnetic head and the magnetic support to be ensured.
  • This invention is particularly suitable for high density magnetic media such as a magnetic card whose number of tracks can reach 150 for a width of 54 mm. In such maps, one can have tracks whose width is of the order of
  • this suspension has serious drawbacks as to the vertical mobility of the head, that is to say perpendicular to the magnetic support.
  • Such a head actually comprises a reading gap and a writing gap spaced longitudinally, that is to say spaced along an axis parallel to the direction of movement of the head relative to the magnetic support. It has been found that when the head moves on the magnetic support, it tends, due to the frictional forces of the head on the support, not to remain parallel to said support, the part of the head opposite to the direction of movement s away from the magnetic support. Thus, according to the direction of movement of the head and according to the arrangement of the two gaps, the contact of one of said gaps is significantly weakened. FIG.
  • Figure 1 illustrates the problem mentioned above in the case where the support is a high density magnetic card for which the reading, for example, is done by successive round trip.
  • Figure la represents the signal obtained during reading in one direction. In this sense, the reading gap is at the front relative to the direction of movement of the head. The contact between the reading gap and the support is good, so we get a good signal / noise ratio. In the other direction
  • Another object of the present invention is to increase the mobility of the magnetic head perpendicular to the magnetic support.
  • the invention therefore relates to a suspension for a magnetic head comprising: a) two flanges (1), (2) surrounding said magnetic head (8) and arranged on two separate parallel planes; one of these flanges (2) is integral with the head, the other (1) is integral with the reader-encoder, b) a flexible part intended to ensure the articulation of the movement of said head, said suspension being characterized in that said flexible part comprises two blades forming a spring (6), (7), each of these spring blades being fixed by two studs, one (19), (19 ') fixing the blade to the first flange, the other (20), (20 ') fixing the blade to the second flange.
  • FIG. 1 represents the envelope of the signal obtained with a head mounted on a suspension such that described in French patent application n ° 8814223
  • - figs. 2A - 2C schematically represent a suspension of a magnetic head as described in the prior art (French patent application n ° 8814223)
  • - Figs. 3A - 3B represent from different angles an embodiment of the head suspension
  • REPLACEMENT SHEET magnetic according to the invention - Figure 4 shows the envelope of the signal obtained with a head mounted on a suspension according to the present invention.
  • figs. 2A - 2C schematically representing a magnetic head suspension as described in patent application No. 8814223.
  • This suspension comprises two flanges (10), (11) located on two separate planes which are parallel to each other. One of these flanges (11) is fixed to the magnetic head (12), the other (10) is integral with the reader-encoder.
  • This suspension also includes a flexible blade (14) corresponding to the water plane and also surrounding the magnetic head. This flexible blade is inserted between the two flanges, preferably at an equal distance from one and the other.
  • This flexible blade is fixed to the rest of the suspension by four fixing studs, two of them (15), (16) fixing the blade to the upper flange, and the other two (17), (18) to the lower flange.
  • a spring blade (not shown) which comes to press on said magnetic head by exerting a force perpendicular to the magnetic support.
  • Figs. 3A - 3B to which reference is now made represents, by way of example, an embodiment of the suspension for magnetic head according to the present invention.
  • this suspension is rectangular and comprises two flanges (1) and (2) located on two separate planes which are parallel to each other.
  • One of these flanges (2) is fixed to the magnetic head (8), the other (1) is integral with the reader-encoder.
  • These flanges surround the magnetic head and are separated by a distance which, in this
  • REPLACEMENT SHEET embodiment is between 1 and 2 mm.
  • the flange (1) integral with the reader-encoder is designed so that it surrounds the head, leaving a space around said head in order to allow the latter to pivot in all directions.
  • This suspension also comprises two flexible blades (6), (7) arranged in two opposite corners of said suspension. Holes are provided for this purpose on the flange secured to the head. In a preferred embodiment, these blades are made of tinsel of steel, but they can also be made, for example, of bronze chrysocale.
  • the thickness of these flexible blades is chosen according to the support force required and can vary between 50 ⁇ m and 300 ⁇ m.
  • These flexible blades are fixed to the rest of the suspension, each at two points, one (19), (19 ') fixing the flexible blade to the flange (2) secured to the magnetic head, the other (20), ( 20 ') fixing the flexible blade to the flange secured to the reader-encoder.
  • the recesses provided in the flange for receiving the flexible blades are at two levels so that the flexible blade is generally parallel to the flange when the head works on a perfectly support plan. Indeed, when the head is in the working position, the flange secured to the head sinks a distance approximately equal to the difference in level of the recess so that the blades are parallel to said flange. This allows greater flexibility in the movement of the head and in particular perpendicular to the magnetic support.
  • the pressing force applied to the magnetic head is applied at each point of attachment of the flexible blades to the flanges. So, in our case, this force is applied at four different points.
  • this bearing force is achieved by means of 4 coil springs which are available at each mounting block between the two flanges. A better distribution of the bearing force on the head is thus obtained.
  • the 4 springs are all identical, but it is obvious that the bearing force can be modulated at each point to compensate for the effects resulting from the friction forces at such and such a point. For this, it is enough to play on the elasticity of the springs at the different fixing points.
  • FIG. 4 shows the signal obtained with a head mounted on a suspension according to the present invention. It can be seen that a good signal / noise ratio is obtained, regardless of the direction of movement of the magnetic head.

Abstract

The invention concerns a magnetic head suspension system. Said system comprises two sidepieces (1 and 2) surrounding the magnetic head and two spring strips (6 and 7), each of the strips being secured by two studs, whereby one secures the strip to the first sidepiece and the other secures the plate to the second sidepiece. Application: for high-density magnetic supports.

Description

SUSPENSION POUR TETES MAGNETIQUES L'invention concerne un système de lecture et d'enregistrement magnétique et plus particulièrement une suspension de tête magnétique permettant d'assurer un contact uniforme entre la tête magnétique et le support magnétique. Cette invention est particulièrement adaptée aux supports magnétiques à haute densité tels qu'une carte magnétique dont le nombre de pistes peut atteindre 150 pour une largeur de 54 mm. Dans de telles cartes, on peut avoir des pistes dont la largeur est de l'ordre de SUSPENSION FOR MAGNETIC HEADS The invention relates to a magnetic reading and recording system and more particularly to a magnetic head suspension enabling uniform contact between the magnetic head and the magnetic support to be ensured. This invention is particularly suitable for high density magnetic media such as a magnetic card whose number of tracks can reach 150 for a width of 54 mm. In such maps, one can have tracks whose width is of the order of
100 μm et des densités d'informations qui peuvent être de l'ordre de 70 Kbits/cm . En réalité, même les cartes magnétiques à haute densité, spécialement conçues pour avoir la.meilleure planéité possible, présentent une erreur de planéité pouvant atteindre dans certains cas la valeur de 100 μm. Or, des études ont montré que la plus infime erreur de positionnement de la tête par rapport au support magnétique (de l'ordre de 0,3 μm) pouvait entraîner une perte dans le rapport signal/bruit pouvant aller jusqu'à 25%.100 μm and information densities which can be of the order of 70 Kbits / cm. In reality, even high density magnetic cards, specially designed to have the best possible flatness, have a flatness error which can in some cases reach the value of 100 μm. However, studies have shown that the smallest error in positioning the head relative to the magnetic support (of the order of 0.3 μm) could lead to a loss in the signal / noise ratio of up to 25%.
Dans la technique antérieure, de telles suspensions ont déjà été réalisées. Ainsi, la demande Française n° 8814223 déposée par la demanderesse le 18 Octobre 1988 et non encore publiée,décrit une suspension particulièrement adaptée pour les supports magnétiques à haute densité. Celle-ci comprend deux flasques entourant la tête magnétique et disposés sur deux plans parallèles distincts ; l'un de ces flasques est solidaire de la tête magnétique, l'autre est solidaire du lecteur-encodeur. Elle comprend également une lame flexible entourant de la même manière la tête magnétique. Pour améliorer le contact de la tête magnétique sur le support, une force d'appui est appliquée directement sur la tête et perpendiculai¬ rement audit support au moyen d'une lame ressort. Même si la suspension décrite dans cette demande n° 8814223 contribue à améliorer de façon sensible le rapport signal sur bruit, elle pose d'autres problèmes. On a observé notamment qu'une telle suspension générait des vibrations limitant les effets, quant au rapport signal sur bruit, résultant d'une telle conception.In the prior art, such suspensions have already been made. Thus, French application n ° 8814223 filed by the applicant on October 18, 1988 and not yet published, describes a suspension particularly suitable for high density magnetic media. This includes two flanges surrounding the magnetic head and arranged on two separate parallel planes; one of these flanges is secured to the magnetic head, the other is secured to the reader-encoder. It also includes a flexible blade similarly surrounding the magnetic head. To improve the contact of the magnetic head on the support, a pressing force is applied directly to the head and perpendicular to said support by means of a leaf spring. Even if the suspension described in this request n ° 8814223 contributes to appreciably improving the signal to noise ratio, it poses other problems. It has been observed in particular that such a suspension generates vibrations limiting the effects, as to the signal to noise ratio, resulting from such a design.
De plus, cette suspension présente de sérieux inconvénients quant à la mobilité verticale de la tête, c'est-à-dire perpendiculairement au support magnétique. Un autre problème apparaît lors de l'utilisation d'une telle suspension avec une tête double-gap. Une telle tête comprend en réalité un gap de lecture et un gap d'écriture espacés longitudinalement c'est-à-dire espacés suivant un axe parallèle au sens de déplacement de la tête par rapport au support magnétique. On a constaté que lorsque la tête se déplace sur le support magnétique, elle a tendance, en raison des forces de frottement de la tête sur le support, à ne pas rester parallèle audit support, la partie de la tête opposée au sens du déplacement s'écartant du support magnétique. Ainsi, suivant le sens de déplacement de la tête et suivant la disposition des deux gaps, le contact de l'un desdits gaps se trouve sensiblement affaibli. La figure 1 illustre le problème ci-dessus évoqué dans le cas où le support est une carte magnétique haute densité pour laquelle la lecture, par exemple, se fait par aller/retour successifs. La figure la représente le signal obtenu lors de la lecture dans un sens. Dans ce sens, le gap de lecture se trouve à l'avant par rapport au sens de déplacement de la tête. Le contact entre le gap de lecture et le support est bon, on obtient donc un bon rapport signal/bruit. Dans l'autre sensIn addition, this suspension has serious drawbacks as to the vertical mobility of the head, that is to say perpendicular to the magnetic support. Another problem arises when using such a suspension with a double-gap head. Such a head actually comprises a reading gap and a writing gap spaced longitudinally, that is to say spaced along an axis parallel to the direction of movement of the head relative to the magnetic support. It has been found that when the head moves on the magnetic support, it tends, due to the frictional forces of the head on the support, not to remain parallel to said support, the part of the head opposite to the direction of movement s away from the magnetic support. Thus, according to the direction of movement of the head and according to the arrangement of the two gaps, the contact of one of said gaps is significantly weakened. FIG. 1 illustrates the problem mentioned above in the case where the support is a high density magnetic card for which the reading, for example, is done by successive round trip. Figure la represents the signal obtained during reading in one direction. In this sense, the reading gap is at the front relative to the direction of movement of the head. The contact between the reading gap and the support is good, so we get a good signal / noise ratio. In the other direction
(figure lb) le gap de lecture se trouve à l'arrière de la tête et a donc tendance à s'écarter du support. Le rapport signal sur bruit est sensiblement moins bon que celui obtenu dans l'autre sens. Aussi est-ce un des objets de la présente invention que de fournir une suspension pour tête magnétique contribuant à améliorer le contact de la tête magnétique sur le support.(figure lb) the reading gap is at the back of the head and therefore tends to move away from the support. The signal-to-noise ratio is significantly worse than that obtained in the other direction. It is therefore one of the objects of the present invention that to provide a suspension for magnetic head helping to improve the contact of the magnetic head on the support.
Un autre objet de la présente invention est d'augmenter la mobilité de la tête magnétique perpendiculairement au support magnétique.Another object of the present invention is to increase the mobility of the magnetic head perpendicular to the magnetic support.
D'autres objets de la présente invention apparaîtront au cours de la description plus détaillée qui va suivre.Other objects of the present invention will appear during the more detailed description which follows.
L'invention concerne donc une suspension pour une tête magnétique comprenant : a) deux flasques (1), (2) entourant ladite tête magnétique (8) et disposés sur deux plans parallèles distincts ; l'un de ces flasques (2) est solidaire de la tête, l'autre (1) est solidaire du lecteur-encodeur, b) une partie flexible destinée à assurer l'articulation du mouvement de ladite tête, ladite suspension étant caractérisée en ce que ladite partie flexible comprend deux lames formant ressort (6), (7), chacune de ces lames ressort étant fixée par deux plots, l'un (19), (19') fixant la lame au premier flasque, l'autre (20), (20') fixant la lame au second flasque.The invention therefore relates to a suspension for a magnetic head comprising: a) two flanges (1), (2) surrounding said magnetic head (8) and arranged on two separate parallel planes; one of these flanges (2) is integral with the head, the other (1) is integral with the reader-encoder, b) a flexible part intended to ensure the articulation of the movement of said head, said suspension being characterized in that said flexible part comprises two blades forming a spring (6), (7), each of these spring blades being fixed by two studs, one (19), (19 ') fixing the blade to the first flange, the other (20), (20 ') fixing the blade to the second flange.
Dans la description qui va suivre, on fera référence aux dessins dans lesquels : - la figure 1, à laquelle on a fait référence dans la partie introductive de la description, représente l'enveloppe du signal obtenu avec une tête montée sur une suspension telle que décrite dans la demande de brevet Français n° 8814223, - les fig. 2A - 2C représentent de façon schématique une suspension de tête magnétique telle que décrite dans la technique antérieure (demande de brevet Française n° 8814223), - les fig. 3A - 3B représentent sous différents angles un mode de réalisation de la suspension de têteIn the description which follows, reference will be made to the drawings in which: FIG. 1, to which reference has been made in the introductory part of the description, represents the envelope of the signal obtained with a head mounted on a suspension such that described in French patent application n ° 8814223, - figs. 2A - 2C schematically represent a suspension of a magnetic head as described in the prior art (French patent application n ° 8814223), - Figs. 3A - 3B represent from different angles an embodiment of the head suspension
FEUILLE DE REMPL ACEMENT magnétique selon l'invention, - la figure 4 représente l'enveloppe du signal obtenu avec une tête montée sur une suspension selon la présente invention. On fait maintenant référence aux fig. 2A - 2C représentant de façon schématique une suspension de tête magnétique telle que décrite dans la demande de brevet n° 8814223.REPLACEMENT SHEET magnetic according to the invention, - Figure 4 shows the envelope of the signal obtained with a head mounted on a suspension according to the present invention. We now refer to figs. 2A - 2C schematically representing a magnetic head suspension as described in patent application No. 8814223.
Cette suspension comprend deux flasques (10), (11) situés sur deux plans distincts et parallèles entre eux. L'un de ces flasques (11) est fixé à la tête magnétique (12), l'autre (10) est solidaire du lecteur-encodeur.This suspension comprises two flanges (10), (11) located on two separate planes which are parallel to each other. One of these flanges (11) is fixed to the magnetic head (12), the other (10) is integral with the reader-encoder.
Cette suspension comprend également une lame flexible (14) correspondant au plan de flottaison et entourant également la tête magnétique. Cette lame flexible est insérée entre les deux flasques, de préférence, à égale distance de l'un et de l'autre.This suspension also includes a flexible blade (14) corresponding to the water plane and also surrounding the magnetic head. This flexible blade is inserted between the two flanges, preferably at an equal distance from one and the other.
Cette lame flexible est fixée au reste de la suspension par quatre plots de fixation, deux d'entre eux (15), (16) fixant la lame au flasque supérieur, et les deux autres (17), (18) au flasque inférieur.This flexible blade is fixed to the rest of the suspension by four fixing studs, two of them (15), (16) fixing the blade to the upper flange, and the other two (17), (18) to the lower flange.
Pour améliorer le contact de la tête magnétique sur le support, il est prévu une lame ressort (non représentée) qui vient appuyer sur ladite tête magnétique en exerçant une force perpendiculaire au support magnétique.To improve the contact of the magnetic head on the support, there is provided a spring blade (not shown) which comes to press on said magnetic head by exerting a force perpendicular to the magnetic support.
Les fig. 3A - 3B à laquelle on fait maintenant référence représente, à titre d'exemple, un mode de réalisation de la suspension pour tête magnétique selon la présente invention. Dans ce mode de réalisation de l'invention, cette suspension est de forme rectangulaire et comprend deux flasques (1) et (2) situés sur deux plans distincts et parallèles entre eux. L'un de ces flasques (2) est fixé à la tête magnétique (8), l'autre (1) est solidaire du lecteur-encodeur. Ces flasques entourent la tête magnétique et sont séparés d'une distance qui, dans ceFigs. 3A - 3B to which reference is now made represents, by way of example, an embodiment of the suspension for magnetic head according to the present invention. In this embodiment of the invention, this suspension is rectangular and comprises two flanges (1) and (2) located on two separate planes which are parallel to each other. One of these flanges (2) is fixed to the magnetic head (8), the other (1) is integral with the reader-encoder. These flanges surround the magnetic head and are separated by a distance which, in this
FEUILLE DE REMPLACEMENT mode de réalisation, est comprise entre 1 et 2 mm. Sur le flasque (2) solidaire de la tête, il est prévu, en deux angles opposés dudit flasque, des décrochements destinés à recevoir les lames flexibles (6) et (7) dont nous parlerons plus en détail ci-après. Le flasque (1) solidaire du lecteur-encodeur est conçu de telle sorte qu'il entoure la tête en laissant un espace autour de ladite tête afin de permettre à cette dernière de pivoter dans toutes les directions. Cette suspension comprend également deux lames flexibles (6), (7) disposées en deux coins opposés de ladite suspension. Des décrochements sont prévus à cet effet sur le flasque solidaire de la tête. Dans un mode de réalisation préférentiel, ces lames sont réalisées en clinquant d'acier, mais elles peuvent également être réalisées, par exemple, en chrysocale de bronze. L'épaisseur de ces lames flexibles est choisie en fonction de la force d'appui nécessaire et peut varier entre 50 μm et 300 μm. Ces lames flexibles sont fixées au reste de la suspension, chacune en deux points, l'un (19), (19') fixant la lame flexible au flasque (2) solidaire de la tête magnétique, l'autre (20), (20') fixant la lame flexible au flasque solidaire du lecteur-encodeur. On a donc ainsi 4 plots de fixation qui, dans un mode de réalisation, sont disposés sur deux axes perpendiculaires entre eux, l'un de ces axes étant parallèle aux pistes du support magnétique. Ces deux lames flexibles immobilisent donc les flasques l'un par rapport à l'autre dans la direction longitudinale, dans la direction transversale, mais également en rotation. Dans le mode de réalisation préférentiel représenté, il est à noter que les décrochements prévus dans le flasque pour recevoir les lames flexibles sont à double niveau de telle sorte que la lame flexible soit globalement parallèle au flasque lorsque la tête travaille sur un support parfaitement plan. En effet, lorsque la tête est en position de travail, le flasque solidaire de la tête s'enfonce d'une distance environ égale à la différence de niveau du décrochement de telle sorte que les lames soient parallèles audit flasque. Ceci permet une plus grande souplesse dans le mouvement de la tête et notamment perpendiculairement au support magnétique.REPLACEMENT SHEET embodiment, is between 1 and 2 mm. On the flange (2) integral with the head, there are provided, at two opposite angles to said flange, recesses intended to receive the flexible blades (6) and (7) which we will discuss in more detail below. The flange (1) integral with the reader-encoder is designed so that it surrounds the head, leaving a space around said head in order to allow the latter to pivot in all directions. This suspension also comprises two flexible blades (6), (7) arranged in two opposite corners of said suspension. Holes are provided for this purpose on the flange secured to the head. In a preferred embodiment, these blades are made of tinsel of steel, but they can also be made, for example, of bronze chrysocale. The thickness of these flexible blades is chosen according to the support force required and can vary between 50 μm and 300 μm. These flexible blades are fixed to the rest of the suspension, each at two points, one (19), (19 ') fixing the flexible blade to the flange (2) secured to the magnetic head, the other (20), ( 20 ') fixing the flexible blade to the flange secured to the reader-encoder. There are thus 4 fixing pads which, in one embodiment, are arranged on two axes perpendicular to each other, one of these axes being parallel to the tracks of the magnetic support. These two flexible blades therefore immobilize the flanges relative to each other in the longitudinal direction, in the transverse direction, but also in rotation. In the preferred embodiment shown, it should be noted that the recesses provided in the flange for receiving the flexible blades are at two levels so that the flexible blade is generally parallel to the flange when the head works on a perfectly support plan. Indeed, when the head is in the working position, the flange secured to the head sinks a distance approximately equal to the difference in level of the recess so that the blades are parallel to said flange. This allows greater flexibility in the movement of the head and in particular perpendicular to the magnetic support.
D'autre part, la force d'appui appliquée sur la tête magnétique est appliquée en chaque point de fixation des lames flexibles aux flasques. Ainsi, dans notre cas, cette force est appliquée en quatre points différents. Dans un mode de réalisation préférentiel, cette force d'appui est réalisée au moyen de 4 ressorts à boudins que l'on dispose à chaque plot.de fixation entre les deux flasques. On obtient ainsi une meilleure répartition de la force d'appui sur la tête. Dans un mode de réalisation préférentiel, les 4 ressorts sont tous identiques mais il est évident que la force d'appui peut être modulée en chaque point pour compenser les effets résultant des forces de frottement en tel ou tel point. Pour cela, il suffit de jouer sur l'élasticité des ressorts aux différents points de fixation.On the other hand, the pressing force applied to the magnetic head is applied at each point of attachment of the flexible blades to the flanges. So, in our case, this force is applied at four different points. In a preferred embodiment, this bearing force is achieved by means of 4 coil springs which are available at each mounting block between the two flanges. A better distribution of the bearing force on the head is thus obtained. In a preferred embodiment, the 4 springs are all identical, but it is obvious that the bearing force can be modulated at each point to compensate for the effects resulting from the friction forces at such and such a point. For this, it is enough to play on the elasticity of the springs at the different fixing points.
La figure 4 à laquelle on fait maintenant référence montre le signal obtenu avec une tête montée sur une suspension selon la présente invention. On constate que l'on obtient un bon rapport signal/bruit, et ce, quelque soit le sens du déplacement de la tête magnétique. Figure 4 to which reference is now made shows the signal obtained with a head mounted on a suspension according to the present invention. It can be seen that a good signal / noise ratio is obtained, regardless of the direction of movement of the magnetic head.

Claims

REVENDICATIONS - Suspension pour tête magnétique d'un lecteur-encodeur comprenant : a) deux flasques (1), (2) entourant ladite tête magnétique disposés sur deux plans parallèles distincts ; l'un de ces flasques (2) est solidaire de la tête, l'autre (1) est solidaire du lecteur- encodeur, b) une partie flexible destinée à assurer l'articulation du mouvement de ladite tête, ladite suspension étant caractérisée en ce que ladite partie flexible comprend deux lames (6), (7) formant ressort, chacune de ces lames étant fixée par deux plots, l'un (19), (19') fixant la lame au premier flasque (2), l'autre (20), (20') fixant la lame au second flasque (1) . - Suspension selon la revendication 1, caractérisée en ce que la force d'appui de la tête magnétique sur le support est réalisée au moyen de ressorts (5) prévus à chaque plot de fixation entre lesdites flasques. - Suspension selon l'une quelconque des revendications 1 à 2 dans laquelle les lames flexibles sont en clinquant d'acier. - Suspension selon l'une quelconque des revendications 1 à 2 dans laquelle les lames flexibles sont en chrysocale de bronze. CLAIMS - Suspension for a magnetic head of a reader-encoder comprising: a) two flanges (1), (2) surrounding said magnetic head arranged on two distinct parallel planes; one of these flanges (2) is integral with the head, the other (1) is integral with the reader-encoder, b) a flexible part intended to ensure the articulation of the movement of said head, said suspension being characterized in that said flexible part comprises two blades (6), (7) forming a spring, each of these blades being fixed by two studs, one (19), (19 ') fixing the blade to the first flange (2), l 'other (20), (20') fixing the blade to the second flange (1). - Suspension according to claim 1, characterized in that the bearing force of the magnetic head on the support is achieved by means of springs (5) provided at each fixing stud between said flanges. - Suspension according to any one of claims 1 to 2 wherein the flexible blades are made of steel foil. - Suspension according to any one of claims 1 to 2 wherein the flexible blades are made of bronze chrysocale.
PCT/FR1990/000125 1989-02-27 1990-02-22 Suspension system for magnetic heads WO1990010289A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR89/02740 1989-02-27
FR8902740A FR2643740B1 (en) 1989-02-27 1989-02-27 SUSPENSION FOR MAGNETIC HEADS

Publications (1)

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WO1990010289A1 true WO1990010289A1 (en) 1990-09-07

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ID=9379298

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Application Number Title Priority Date Filing Date
PCT/FR1990/000125 WO1990010289A1 (en) 1989-02-27 1990-02-22 Suspension system for magnetic heads

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EP (1) EP0460104A1 (en)
FR (1) FR2643740B1 (en)
WO (1) WO1990010289A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2212899A1 (en) * 1971-04-01 1972-10-19 Motorola Inc Holder for the magnetic tape head of a tape player
US4040097A (en) * 1975-01-20 1977-08-02 Kabushiki Kaisha Sankyo Seiki Seisakusho Magnetic card-reader with movable magnetic head
US4110803A (en) * 1977-01-28 1978-08-29 Xerox Corporation Magnetic head assembly adjustable relative to roll, pitch and azimuth
US4304992A (en) * 1975-06-26 1981-12-08 Kabushiki Kaisha Sankyo Seiki Seisakusho Magnetic card reader
JPS60143490A (en) * 1983-12-29 1985-07-29 Matsushita Electric Ind Co Ltd Magnetic head holding structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2212899A1 (en) * 1971-04-01 1972-10-19 Motorola Inc Holder for the magnetic tape head of a tape player
US4040097A (en) * 1975-01-20 1977-08-02 Kabushiki Kaisha Sankyo Seiki Seisakusho Magnetic card-reader with movable magnetic head
US4304992A (en) * 1975-06-26 1981-12-08 Kabushiki Kaisha Sankyo Seiki Seisakusho Magnetic card reader
US4110803A (en) * 1977-01-28 1978-08-29 Xerox Corporation Magnetic head assembly adjustable relative to roll, pitch and azimuth
JPS60143490A (en) * 1983-12-29 1985-07-29 Matsushita Electric Ind Co Ltd Magnetic head holding structure

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Volume 9, No. 314 (P-412) (2037), 10 Decembre 1985, & JP-A-60143490 (Matsushita) 29 Juillet 1985 *

Also Published As

Publication number Publication date
FR2643740B1 (en) 1991-06-07
FR2643740A1 (en) 1990-08-31
EP0460104A1 (en) 1991-12-11

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