CN1069772C - Magnetic head and magnetic head apparatus - Google Patents

Magnetic head and magnetic head apparatus Download PDF

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Publication number
CN1069772C
CN1069772C CN96109388A CN96109388A CN1069772C CN 1069772 C CN1069772 C CN 1069772C CN 96109388 A CN96109388 A CN 96109388A CN 96109388 A CN96109388 A CN 96109388A CN 1069772 C CN1069772 C CN 1069772C
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CN
China
Prior art keywords
magnetic head
magnetic
revolving shaft
clamper
magnetic core
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Expired - Fee Related
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CN96109388A
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Chinese (zh)
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CN1145513A (en
Inventor
上村道夫
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Alps Alpine Co Ltd
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Alps Electric Co Ltd
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Priority claimed from JP20342195A external-priority patent/JPH0954927A/en
Priority claimed from JP20338795A external-priority patent/JPH0954926A/en
Application filed by Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Publication of CN1145513A publication Critical patent/CN1145513A/en
Application granted granted Critical
Publication of CN1069772C publication Critical patent/CN1069772C/en
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  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)

Abstract

In a magnetic head device for an auto-reverse tape recorder, holder halves 12 and 13 are provided respectively in a shield case 11, and core halves 14 and 15 are held by the holder halves 12 and 13. The holder half 12 is extended to the side of a back part of the shield case 11, and a base part 12d of the holder half 12 is formed integrally with the rotary shaft 21. Consequently, a tolerance from the gap G1 to the rotary shaft 21 depends only upon a working tolerance and an assembly tolerance from the core half 14 to the holder half 12, and hence a distance from the gap G1 to the rotary shaft 21 can be determined with high accuracy. Therefore, positional adjustment work is not required when the magnetic head device is assembled.

Description

Magnetic head assembly
The present invention relates to a kind of magnetic head assembly.This magnetic head comprises a magnetic core that is used to produce magnetic gap, and this magnetic head is placed in the housing, and wherein, this magnetic head can rotate 180 ° by an one rotating shaft.
The magnetic head assembly that has a kind of auto-reverse blattnerphone, when as a kind of rotation direction of tape of magnetic medium when reverse, rotatable 180 ° of the magnetic head of this device.For two magnetic tracks that are located on this magnetic head slidingsurface, this rotation of 180 ° has changed the contact position between magnetic core gap and the tape.
Figure 21 is the front view of the magnetic head assembly HA of a kind of common rotation suitching type of expression, and Figure 22 is the skeleton view of the rotating part of this magnetic head assembly of expression HA, and Figure 21 and Figure 22 come from Japanese Utility Model and disclose communique No. 81729/1983.
In a kind of recording/playback head Ha shown in Figure 22, on the slidingsurface 1a of shield shell 1, be a clearance G a who disposes relatively of two magnetic track magnetic cores.Place near this magnetic head Ha is provided with an erase magnetic head Hb.On the slidingsurface 2a of the clamping housing 2 of erase magnetic head Hb, be the erasure magnetic track Gb of a double gap formula.
A recess 3a is arranged on the front surface of a disc bearing 3.The back side of the back side of magnetic head Ha and erase magnetic head Hb is inserted among this recess 3a, and fixing with resin adhesive etc.In the front of bearing 3, the downstream with respect to the tape running direction of magnetic head Ha is provided with a tape guidance device 4.Be provided with a discoidal axle pedestal 5 in the back of bearing 3.Revolving shaft 6 is fixed on the core of a pedestal 5 by clinching method.
Bearing 3 is provided with two mounting hole 3b.On the axle pedestal 5 two screw 5a are arranged.Axle pedestal 5 is positioned at the back of bearing 3.The mounting screw that inserts among two mounting hole 3b is screwed among two screw 5a.Bearing 3 and axle pedestal 5 fixed to one another being in the same place.One among two mounting hole 3b is played the benchmark effect.
Block bossing 5b integrally does on the excircle of axle pedestal 5.Block bossing 5b is outwards outstanding at radial direction.Two side surfaces of block bossing 5b have formed stop-surface 5c and 5d.Stop-surface 5c almost is parallel with 5d each other.
In the mechanical part of automatic reverse type recorder, rest pad 7 is fixed on the magnetic head base, as shown in figure 21.Core at rest pad 7 has a bearing along Z direction orientation.Above-mentioned revolving shaft 6 is bearing in this bearing rotationally.Adjust screw 8a and 8b is screwed in the rest pad 7 for two.In Figure 21, adjust screw 8a and 8b is upwards pushed away by a sheet spring 9 for two, the possibility that two screws are unclamped reduces to minimum like this.
Between this revolving shaft 6 and this mechanical part, mainly be provided with a mechanism and the torsionspring that revolving shaft 6 is rotated.The mechanism that this rotates revolving shaft 6 by a gear train, makes axle 6 turn round 180 ° in the opposite direction.This torsionspring promotes this revolving shaft 6 on 180 ° of rotating two reverse directions.
When tape in the F direction, promptly forwards to when operation, the stop-surface 5c of block bossing 5b is subjected to the expulsive force that mainly applied by torsionspring, and with adjust screw 8a and contact.Control the length that is screwed into of this adjustment screw 8a,, make clearance G a vertical with the traffic direction of the tape that moves in the F direction to regulate the orientation of this stop-surface 5c.When the traffic direction of tape switches to the R direction, promptly during reverse directions, bearing 3 rotates 180 ° around the center O of revolving shaft 6.Like this, because the effect of the expulsive force that torsionspring applied originally makes the stop-surface 5d of this block bossing 5b contact with adjustment screw 8b.At this moment, the length that is screwed into of screw 8b is adjusted in control, to adjust the orientation of stop-surface 5d, makes clearance G a with vertical at the tape running direction of R direction operation.
As shown in figure 22, in magnetic head assembly HA, this magnetic head Ha is fixed on the bearing 3, and this bearing is fixed on the pedestal 5, and block bossing 5b does on this pedestal 5.Like this, get up, make to be difficult to make the square connection surface of this clearance G a accurately cooperating with this stop-surface 5c and 5d in the clearance G a of magnetic head Ha and the processing of each part between the block bossing 5b and the tolerance stack of installation dimension.Therefore, as shown in figure 21,, must utilize and adjust the orientation that screw 8a and 8b adjust stop-surface 5c or 5d, adjust this clearance G a with respect to direction at the tape of F direction and the operation of R direction when tape during in the operation of F direction or R direction.
Yet, a mechanism that is used to adjust the orientation is provided, as shown in figure 21, need equip rest pad 7 with adjusting screw 8a and 8b and sheet spring 9, the result increases the part that constitutes rest pad 7.In addition, when the mechanical part of assembling automatic reverse type recorder, must utilize adjustment screw 8a and 8b to adjust the orientation of stop-surface, then, lock adjustment screw 8a and 8b, like this, just increase the number of adjusting operation with bonding agent.
In addition, when continuing to use this automatic reverse type recorder, adjusting screw 8a and 8b has the moving danger that fluffs.If it is loosening to adjust screw 8a or 8b, then the location when bearing 3 changes 180 ° may be disturbed, thereby this clearance G a angle relative with tape may produce skew, causes problems such as the playback output quality degenerates.
A first aspect of the present invention is to try hard to solve the variety of issue of above-mentioned common technology, therefore an object of the present invention is a kind of magnetic head assembly will be provided, the position relation that this device can make the gap of magnetic core connect between surface and the stop-surface is provided with very accurately, and, when magnetic head rotates 180 °, can make this gap reduce to minimum, therefore with respect to the deflection error of tape, do not need to adjust the orientation of stop-surface by tightening screw as usually.
Figure 23 A and Figure 23 B represent respectively to be used for to record and the tape T of playback at this magnetic head assembly HA, and this tape moves in the F direction with respect to the slidingsurface of independent erase magnetic head Hb and independent magnetic head unit Ha.
In Figure 23 A, reference symbol O represents the axis centre of this revolving shaft 6, i.e. the centre of gyration of magnetic head assembly HA.In Figure 23 A and Figure 23 B, be used for the rest pad 7 of supporting rotating shaft 6 pivotally, on two sides that the tape along this magnetic head assembly HA moves, be provided with four tape guidance device 7a.
This rest pad 7 is fixed on the magnetic head base of mechanical part of this automatic reverse type recorder.This mechanical part will assemble to such an extent that make the center of bearing of this rest pad 7 consistent with the width center To of this operating tape T.Therefore, ideal situation is: this is inserted in the axis centre of this revolving shaft 6 in the bearing pivotally, and promptly the centre of gyration O of this magnetic head assembly HA is consistent with the width center To of tape T.The tape guidance device 7a that is located on this rest pad 7 is also consistent with the width center To of tape T at the center of Y direction.
Therefore, in this magnetic head assembly HA that forms by various parts shown in Figure 22, if, in the tape width direction, be on the Y direction, when the interval δ between the centre of gyration O of this revolving shaft 6 and the track width center of these two track gap Ga can accurately be provided with, then this double track clearance G a slided on tape T the position accurately.Figure 23 A is illustrated in the state that ideal value δ 1 has been arranged in gap between the center of centre of gyration O and this double track clearance G a.In this case, this clearance G a slides on the tape that moves along the F direction with appropriate track location.In addition, because the width center To of tape T is almost consistent with the height center of this independent magnetic head unit Ha, so the center of this tape guidance device 4 is also consistent with this center To.This tape guidance device 4 is fixed on the side surface of this independent magnetic head unit Ha.Like this, the tape guidance device 7a of this tape guidance device 4 and rest pad can give tape T guiding well.
Figure 23 B represents this magnetic head assembly HA, and it is assembled between the center of the centre of gyration O of revolving shaft 6 and this double track clearance G a, at the state that is set to δ 2 of Y direction.The value of δ 2 is bigger than ideal value δ 1.In this case, the tape T downward bias among the relative figure in position at the center of the clearance G a of the magnetic head unit Ha that this is independent from, cause offset between the magnetic track of this double track clearance G a and tape.This may make information can not record on the accurate track location of tape T in Recording Process, also can cause in the playback process, and the playback between adjacent two magnetic tracks produces the cross-talk phenomenon or playback output reduces.In addition, because in the drawings, the relative tape T of this independent magnetic head unit Ha offsets downward, and therefore, in the figure, this tape guidance device 4 is pushed down tape T to.The contact resistance that this has increased between tape edge and this tape guidance device 4 has also increased the contact resistance between tape edge and the tape guidance device 7a, and the result causes bigger danger for tape T.
Therefore, if magnetic head assembly HA is assembled into the centre of gyration O of the track width center that makes this double track clearance G a and this revolving shaft 6 height accurate relative position relation is arranged, then the characteristic of this magnetic head can be given full play to.In other words, the interference that this relative position is subjected to is many more, and then the characteristic of this magnetic head is more bad.
Illustrate in conjunction with Figure 24 now, in magnetic head assembly HA shown in Figure 22, the manufacturing tolerance of being accumulated to the centre of gyration O of this revolving shaft 6 from the center of this two clearance G a.
In this independent magnetic head unit Ha, the magnetic core that forms two relative gap Ga is supported by clamper.This clamper utilizes the die casting manufacturing, and it is placed on the inside surface of shield shell 1.Like this, the tolerance of being accumulated to this shield shell 1 from these two clearance G a comprises the tolerance (a) of each size of processing magnetic core, when being installed in magnetic core in the clamper, the dimensional tolerence of installation site (b), the tolerance (c) of each size of processing clamper, when this clamper being installed in this shield shell 1, the tolerance (e) of the dimensional tolerence of installation site (d) and this each size of shield shell of processing.
Equally, the tolerance that centre of gyration O from this shield shell 1 to this revolving shaft 6 is accumulated comprises: the location tolerance (f) when this shield shell 1 is installed in bearing 3, the recess 3a of bearing 3 and the processing dimension tolerance of mounting hole 3b, be the generation dimensional tolerence (g) of bearing 3, the installation dimension tolerance (i) of the 6 relative pedestals of installation dimension tolerance (h) and this revolving shaft 5 when being installed in bearing 3 on the pedestal 5.
Therefore, all tolerance stack of above-mentioned (a) to (i) are between the center of the track width center of this two clearance G a and this revolving shaft 6.
When not correction up of magnetic head assembly HA shown in Figure 22 assemble up, and when being installed on the mechanical part shown in Figure 23, above-mentioned big cumulative limit makes that the error of the described interval δ 2 of Figure 23 B is very big.For this reason, therefore when this magnetic head assembly of assembling HA, the process of a position correction must be arranged.
Usually, owing to following reason, utilize above-mentioned method for correcting position make at interval the error of δ 2 reduce to minimum be have circumscribed.That is, in magnetic head assembly HA shown in Figure 22, bearing 3 is actually as one of this magnetic head assembly complete parts and treats, and the mechanical part assembling process of supply blattnerphone.This independent magnetic head unit Ha is installed, this independent erase magnetic head parts Hb and this tape guidance device 4 on this bearing 3.In the assembling process of mechanical part, axle pedestal 5 and revolving shaft 6 shown in Figure 22 are pre-assembled on the rest pad 7 of mechanical part shown in Figure 23.Other part for example makes revolving shaft 6 gear mechanism that rotates and the torsionspring that promotes this revolving shaft 6 be installed on this mechanical part.The parts of being made up of above-mentioned each part are installed on the bearing 3, and these parts are fixed by being screwed in screw on this pedestal 5.Like this, just these parts are assemblied on this mechanical part.Mounting hole 3b plays the benchmark effect.
So, in this parts assembling process, when the center of two clearance G a that want to proofread and correct this independent magnetic head unit Ha, should not exist as the revolving shaft 6 of benchmark.Therefore, in the assembling process of these parts, two mounting hole 3b on the bearing 3 can be used as benchmark.The magnetic head unit Ha that this is independent moves in the recess 3a of bearing 3, clearance G a is set in the position range of a regulation, then, utilizes glue will this independent magnetic head unit Ha bonding and be fixed on this bearing 3.
Like this, the process that the magnetic head unit Ha that this is independent is placed on the parts that this each part forms is very complicated, and comprise following point: promptly, when with mounting hole 3b as benchmark, when accurately being arranged on clearance G a on the parts that this each part forms, then bearing 3 is installed in tolerance (h) on this pedestal 5 and this revolving shaft 6 and is installed in position of related features (i) on this pedestal 5, during as reference for installation, will included inevitably with these two mounting hole 3b.Like this, when the mechanical part of blattnerphone has assembled, be difficult to make this clearance G a to be provided with very accurately with respect to the position of tape.
Second, third and fourth aspect of the present invention try hard to solve some problems of above-mentioned prior art.Therefore, an object of the present invention is to provide a kind of magnetic head assembly, and it highly precisely sets the size of the axis centre of this gap and this revolving shaft in the following step.In this step, the accumulated size tolerance that is located at this gap in the independent magnetic head unit and the various parts between this revolving shaft can reduce to minimum, thereby does not need to carry out position correction in assembling process.
In addition, of the present invention second another purpose to fourth aspect is that a kind of magnetic head assembly will be provided.This device can carry out position correction as benchmark by revolving shaft, and even need timing when the position of independent magnetic head unit, can very accurately set the distance between this gap and the centre of gyration at the completing place timing.
In addition, can utilize mounting hole 36, proofread and correct the position of this magnetic head Ha as benchmark.When being installed in this magnetic head Ha on this bearing 3, mounting hole 3b provides benchmark for an erection support 3 and an axle pedestal 5.Then, after having finished position correction, cling magnetic head Ha, and magnetic head Ha is fixed on this bearing 3 with glue.This process is very complicated.Because revolving shaft 6 also is not installed on this bearing 3, therefore, must utilize the center of two mounting hole 3b to remove to be provided with the magnetic gap Ga of two magnetic tracks as benchmark.Like this, this magnetic head Ha is placed in this supporting, and the location is very difficult, and also can not guarantees high bearing accuracy.
A fifth aspect of the present invention tries hard to solve the problem of above-mentioned prior art, and its objective is provides a kind of magnetic head, this magnetic head can guarantee the magnetic gap in this magnetic head and the height accurate relative position of mounting portion.
The 4th purpose of the present invention provides a kind of revolving head device, when this device is installed on the pedestal at magnetic head, can guarantee the axis centre height accurate relative position of the magnetic gap and the revolving shaft of magnetic head.
According to a first aspect of the invention, provide a kind of magnetic head assembly.This device comprises: a magnetic head and a rest pad.This magnetic head includes a magnetic core in housing, be used to form a gap.This rest pad is supporting this magnetic head rotationally.When this magnetic head rotated 180 °, the contact position between this gap and the magnetic medium changed.Wherein, this magnetic head has two stop-surface, and these two stop-surface connect surface in alignment or parallel with this surface with the gap of magnetic core, and simultaneously, these two stop-surface are in alignment with each other or are parallel.This rest pad has one first localization part and one second localization part.A stop-surface in two stop-surface contacts with this first localization part, and when magnetic head rotates 180 °, and when reaching two extreme positions, this another stop-surface contacts with this second localization part.
According to the present invention, this magnetic head is bearing on this rest pad rotationally, and the bearing that supports this magnetic head is bearing on this rest pad rotationally.Being located at two stop-surface on this magnetic head makes and makes the gap of the magnetic core in these two stop-surface and this magnetic head connect surface in alignment or parallel.These two stop-surface for example can be done on this holder or shield shell.This holder or shield shell clamping the magnetic core in this magnetic head or are supported the bearing of this magnetic head.Like this, feature of the present invention is that these two stop-surface connect surface in alignment or parallel with the magnetic gap of this magnetic core.
In common example shown in Figure 22, the connection of the clearance G a of this magnetic head Ha surface is vertical with 5d with stop-surface 5c.Therefore, be difficult to make these two stop-surface 5c accurately vertical with 5d by utilizing this clearance surface as benchmark.The present invention since the gap connect to align with these two stop-surface in the surface or be parallel, therefore can be easily and accurately set this gap and connect relation between surperficial and corresponding two stop-surface.
Under the situation of the embodiment of Fig. 1 to Fig. 7, these two stop-surface are placed on the both sides of the revolving shaft of this magnetic head, and point to same direction.The position of these two stop-surface also makes them can be not overlapping at the axial direction of revolving shaft.Therefore, these two stop-surface are processed on same plane or a parallel plane easily, and these two stop-surface connect surface in alignment or parallel with this gap easily.
These two stop-surface preferably and a part integral body in the magnetic head make.This magnetic core is just placed and is fixed on this part.This part for example, can be half clamper.Half magnetic core or half shield shell in this half clamper clamping.In this case, can utilize the gap of this magnetic core to connect the surface as benchmark, go to process corresponding two stop-surface, or utilize these two stop-surface to make benchmark, the gap of going to process this magnetic core connects the surface.This can very accurately make this gap connect to align with the block bossing in the surface or be parallel.
In the present invention, preferably at least one stop-surface is placed on the surface identical with the connection surface, gap of this magnetic core.Yet when these two stop-surface were located on half clamper or half shield shell, the gap of this magnetic core of grinding simultaneously connected surface and one or two stop-surface, this magnetic core is connected surperficially align with one or two stop-surface.In this case, when this revolving shaft was located on this half clamper, this revolving shaft can be placed like this, made the external peripheral surface of this revolving shaft not be connected surface in alignment with this gap.Like this, this revolving shaft can not be connected the grinding work interference of surface and these two stop-surface with this gap.
The present invention can be easy to and very accurately make these two stop-surface be connected surface in alignment or parallel with the gap of this magnetic head.Therefore, when this supporting member that supports this magnetic head rotationally has two aligned with each other or parallel localization parts, when this magnetic head rotates 180 °, can very accurately make this head alignment magnetic medium.This does not just need orientation adjustment mechanism as shown in figure 21.
According to a second aspect of the invention, provide a magnetic head assembly, this device comprises: an independent magnetic head unit and an one rotating shaft.This magnetic head unit has a housing and a magnetic core that is placed in this housing.In these parts, on a surface of housing, a magnetic core gap is arranged.The magnetic medium of this housing slides on the surface of magnetic core.This revolving shaft is placed on the back of this independent magnetic head unit, and when magnetic head changes with respect to the contact direction of the slidingsurface of magnetic medium, can provide a centre of gyration.Wherein, this revolving shaft is directly installed on this independent magnetic head unit.
According to a second aspect of the invention, this revolving shaft is directly installed on this independent magnetic head unit, like this, just can cancel bearing shown in Figure 22 3 and axle pedestal 5.This means, in Figure 24, can eliminate the dimensional tolerence (f) when this independent magnetic head unit is installed on the bearing 3 at least, dimensional tolerence when making this bearing 3 (g) and the tolerance (h) when being installed in this bearing (3) on this pedestal 5.Therefore, the variable in distance between the centre of gyration O as shown in figure 23 and the track width center in these two gaps can reduce, and like this, can will should be provided with very near ideal value δ 1 apart from δ 2.In addition, because this revolving shaft is directly installed on this independent magnetic head unit, therefore, when this magnetic head assembly of assembling, can cancel the process of laying revolving shaft and the gap being set.
Best, this independent magnetic head unit has a clamper, be used for magnetic core is placed on this housing, and revolving shaft is installed on this clamper.In addition, preferably this clamper and revolving shaft are made a part.Can eliminate the dimensional tolerence (d) of accumulation like this, (e), (f), (g) and (h).Make one when whole when clamper and this revolving shaft, dimensional tolerence (i) also can be eliminated.Like this, interval between the track width center in centre of gyration O and this gap can very accurately be set.
In another alternative structure, when utilizing housing to make benchmark, this revolving shaft can be installed on this housing directly or indirectly.For example, can be provided with one and make holistic axle pedestal, and this pedestal is fixed on this housing, perhaps in the back of this independent magnetic head unit with this revolving shaft, a side plate of this shield shell is bent to approximate right angle, and this rotating shaft is fixed on this sweep.In this case, can eliminate cumulative limit (f), (g) and (h).
According to a third aspect of the invention we, provide a kind of magnetic head assembly.This device comprises: an independent magnetic head unit and an one rotating shaft.This magnetic head unit has a housing and a magnetic core that is placed in this housing.In these parts, on a surface of housing, make the gap of this magnetic core.Magnetic medium slides on the magnetic core surface.This revolving shaft is placed on the back of this independent magnetic head unit, and this magnetic head can provide a centre of gyration when changing with respect to the contact direction of the slidingsurface of this magnetic medium.Wherein, be provided with a supporting member, this independent magnetic head unit is placed and is fixed on this supporting member.Simultaneously, this revolving shaft is placed on this supporting member.
Above-mentioned supporting member is an one flat plate, and it is fixed on the side of this independent magnetic head unit housing.The part of this flat board forms a tape guidance device.This tape guidance device is given prominence to the front end at the slidingsurface of this independent magnetic head unit.This supporting member is a bearing.Bearing has a recess or opening, and the back side of the magnetic head unit that this is independent is embedded in this recess.Best, it is an integral part of this bearing that this revolving shaft is made.
According to a third aspect of the invention we, magnetic head unit that this is independent is placed and is fixed on this supporting member, can eliminate (g) and (h) item cumulative limit among Figure 24.In the shield shell of this independent magnetic head unit, placing magnetic core and other part, and this revolving shaft is being installed on this supporting member.Like this, can make interval between the track width center in centre of gyration O and this gap near ideal value δ 1.In addition, in a third aspect of the present invention, because this revolving shaft is installed on the supporting member of this flat board or pedestal, tape guidance device as its integral part is arranged on this bearing, therefore, when the gap is set, can utilize this revolving shaft as benchmark.When the interval between centre of gyration O and this gap reached ideal value δ 1, this independent magnetic head unit can be fixed on this supporting member well.
According to a forth aspect of the invention, provide a kind of magnetic head assembly.This device comprises: independent recording/playback head parts, independent erase magnetic head parts and an one rotating shaft.This recording/playback head parts have a housing and the magnetic core that is placed in this housing.In these parts, on a surface of housing, done a magnetic core gap.Magnetic medium slides on this magnetic core surface.These independent erase magnetic head parts are fixed on the side of this independent magnetic head unit.This revolving shaft is placed on the back of this independent magnetic head unit or independent erase magnetic head parts, and when the contact direction of the corresponding relative magnetic medium of magnetic head unit separately changes, can provide a centre of gyration.Wherein, this revolving shaft is directly installed on these independent erase magnetic head parts.
Best, the housing of this revolving shaft and these independent erase magnetic head parts, promptly the clamping housing is made an integral body.
A fourth aspect of the present invention has replaced this supporting member with these independent erase magnetic head parts, for example flat board in a third aspect of the present invention or bearing.By this independent magnetic head unit is placed and is fixed on these independent erase magnetic head parts, and this revolving shaft directly very accurately is installed on these independent erase magnetic head parts, can eliminates (g) shown in Figure 24 and (h) item cumulative limit.Like this, the position that can very accurately set between the centre of gyration and this gap concerns.In addition, utilize this revolving shaft to make benchmark, magnetic head unit that can this is independent is placed and is fixed on these independent erase magnetic head parts, like this, can guarantee the relative position relation in this centre of gyration and this gap easily.In addition, usually, the magnetic core of this erase magnetic head is placed in the plastic casing, and like this, an integral part this housing being made this revolving shaft can highly precisely be provided with the position of this revolving shaft with respect to this independent erase magnetic head.Therefore, the relative position set up of these independent erase magnetic head parts and this independent magnetic head unit can very accurately guarantee the gap of this independent magnetic head unit and the relative position of this centre of gyration.
According to a fifth aspect of the invention, provide a kind of magnetic head.This magnetic head comprises: a magnetic core and a clamper.This magnetic core is made by magnetic material, is used to form a magnetic gap.This clamper is used for this magnetic core of clamping.This magnetic core and clamper are placed in the housing.Wherein, this clamper has a mounting portion, and give prominence on this housing this mounting portion.
Best, this clamper and this mounting portion are made a part.Utilize a sheet metal to make this clamper and just accomplish this point.In this case, be used for the bossing that magnetic core is placed on the clamper is come out in the housing compacting, and in this housing outside, with this clamper bending, to form this mounting portion.Utilize sheet metal to make clamper and may the working pressure job operation make this clamper, like this, the manufacturing cost of whole magnetic head is reduced.Utilize this clamper of alloy die casting this clamper and this mounting portion can be made a part.
The common assembly of this magnetic head and bearing 3 shown in Figure 22 adapts.This bearing 3 is to make holistic with clamper.This has just eliminated (d) shown in Figure 24, (e), and (f) and (g) cumulative limit.Therefore can very accurately set from this mounting portion to the size in this gap, like this, when making this magnetic head, can not need this position fixing process, in addition, owing to no longer need bearing, number of parts can reduce, the result, and manufacturing cost reduces.
A fifth aspect of the present invention is characterised in that outwards outstanding and this clamper that is used for the clamping magnetic core is placed in the housing from the housing of this magnetic head in this mounting portion.This magnetic head is equipped with the magnetic core of being made by magnetic material, is used to form magnetic gap.For example, the part of this housing is crooked, to form this mounting portion.
Adapt according to the magnetic head of fifth aspect present invention and common bearing 3 assemblies shown in Figure 22.This bearing 3 is made an integral body with this shield shell.This has just eliminated (f) shown in Figure 24 and (g) cumulative limit.Therefore, can very accurately guarantee the relative position in this mounting portion and this gap, like this, just not need as in the common technology, magnetic head being placed and is installed in complex work on the bearing.If magnetic core directly is bearing on this shield shell, (c) then shown in Figure 24, (d), (f) and (g) cumulative limit also can be eliminated.
This magnetic head is installed on the returning head device.More particularly, any one magnetic head all is installed on the pedestal by the mounting portion in the above-mentioned various magnetic head.This pedestal has revolving shaft.This revolving shaft is bearing on the rest pad rotationally, and therefore, magnetic head can rotate 180 ° relative to rest pad.
Like this, the relative position of the axis centre of revolving shaft and this magnetic gap can very accurately determine.When magnetic head when revolving shaft rotates 180 °, on the Y direction shown in Figure 23 A, the distance between this magnetic gap and this centre of gyration can be set the value near ideal value δ 1 for.
Except this returning head device, go for the magnetic head assembly of other form according to the magnetic head of fifth aspect present invention.For example, do to lay in this mounting portion under the situation of magnetic head assembly of this form on the clamper of magnetic core, by this mounting portion is placed and is installed on the reference position of this equipment, can very accurately this magnetic gap be arranged in this equipment, for example blattnerphone.
The advantage of invention
As mentioned above, a first aspect of the present invention when magnetic head rotates 180 ° and when not needing orientation adjustment, can make the location in gap very accurate.
Even comprised orientation adjustment, setting range is also very limited, and this makes manufacture process efficient higher.
According to a second aspect of the invention, revolving shaft is directly arranged on the independent magnetic head unit, and revolving shaft, for example, be located on a clamper or the shield shell, like this, when magnetic head assembly is made up of independent magnetic head unit and revolving shaft, can guarantee the gap of magnetic head and point-device relative position of the centre of gyration.Therefore, do not need independent magnetic head unit to be placed on the bearing as in the common magnetic head assembly.
According to third and fourth aspect of the present invention, revolving shaft is located on one flat plate or the bearing, and this bearing has as the tape guidance device of its integral part or independent erase magnetic head parts.And independent magnetic head unit and this flat board, bearing or independent erase magnetic head parts connect.This design makes the distance from the gap of independent magnetic head unit to the axis centre of revolving shaft can be provided with very accurately.This structure can also utilize revolving shaft to lay this independent magnetic head unit as benchmark.Because definite benchmark is arranged, make that the work of laying is easier to be carried out.
In magnetic head according to a fifth aspect of the invention, the mounting portion is located on clamper or the housing, can very accurately guarantee the relative position of mounting portion and magnetic gap, does not need as at common example shown in Figure 22, before fixed head, magnetic head be located with respect to bearing.The cancellation bearing reduces number of parts, and cost reduces.
Axis centre and the relation of the position between the magnetic gap that can very accurately establish revolving shaft according to revolving head device of the present invention, therefore, no matter tape in F direction or the operation of R direction, can make magnetic gap accurately on the opposite of tape.
Below, in conjunction with the accompanying drawings specific embodiments of the invention are elaborated.
Fig. 1 is a sectional view, the magnetic head assembly of its expression first embodiment according to the invention;
The sectional view of Fig. 2 for being got along the II-II line of Fig. 1;
Fig. 3 is installed in a skeleton view on the rest pad for expression magnetic head assembly illustrated in figures 1 and 2;
Fig. 4 is the enlarged perspective of a localization part of rest pad shown in Figure 3;
The sectional view of Fig. 5 for being got along the V-V line of Fig. 3, a magnetic head that locates when its expression magnetic head rotates;
Fig. 6 is when rest pad is made with sheet metal, the skeleton view of this magnetic head assembly assembly;
Fig. 7 is a sectional view, the improvement example of the magnetic head assembly of its expression first embodiment according to the invention;
Fig. 8 is a sectional view, and another of the magnetic head assembly of its expression first embodiment according to the invention improves example;
Fig. 9 is a front view, its expression magnetic head assembly shown in Figure 8, and this device is supported by rest pad;
Figure 10 is the sectional view of expression according to the magnetic head assembly of second embodiment of the present invention;
Figure 11 is the sectional view that improve example of expression according to the magnetic head assembly of second embodiment of the present invention;
Figure 12 A is the side view of expression according to the magnetic head assembly of the 3rd embodiment of the present invention;
Figure 12 B is the side view of the improved form of presentation graphs 12A;
Figure 13 is the side view of expression according to the magnetic head assembly of the 4th embodiment of the present invention;
Figure 14 is the side view of expression according to the magnetic head assembly of the 5th embodiment of the present invention;
Figure 15 is the decomposition diagram of expression revolving head device according to a sixth embodiment of the present;
Figure 16 is the sectional view that is used for a magnetic head of the revolving head device shown in Figure 15;
The sectional view of Figure 17 for being got along the III-III line of the described magnetic head of Figure 16;
Figure 18 A is the front view of seeing from connection surface one side of half clamper being made by die casting; Figure 18 B is a vertical view; Figure 18 C is a side view;
Figure 19 is the partial cross section figure that be connected example of axle pedestal of expression with a mounting portion made from this half clamper integral body;
Figure 20 is the skeleton view of the magnetic head of expression the 7th embodiment of the present invention;
Figure 21 is the front view of a common magnetic head assembly of expression;
Figure 22 is the decomposition diagram of common magnetic head assembly;
Figure 23 A and 23B are the front view of the tape that just sliding of expression on magnetic head assembly, Figure 23 A is illustrated in the centre of gyration of this magnetic head assembly and the interval of an ideal value between the gap; Figure 23 B represents to have this centre of gyration under the big error condition and the interval between the gap;
Figure 24 is for being illustrated in the revolving head device key diagram of the tolerance that the center from this gap to this revolving shaft is accumulated.
Embodiment
Fig. 1 is the sectional view of expression corresponding to the magnetic head assembly HB1 of first embodiment of a first aspect of the present invention and second aspect, and it is corresponding to the sectional view of being got along I-I line shown in Figure 3.Fig. 2 is along the sectional view that II-II got shown in Figure 1.Fig. 3 is bearing in the decomposition diagram of a structure on the rest pad pivotally for expression magnetic head assembly HB1.Fig. 4 is the skeleton view of an amplification of localization part 34; The sectional view of Fig. 5 for being got along V-V line shown in Figure 3.
In magnetic head assembly HB1 illustrated in figures 1 and 2, shield shell 11 is by magnetic material, and for example Fe-Ni-Mo (iron-nickel-molybdenum) alloy is made.Keeping two half clampers 12 and 13 in shield shell 11, they are made by a kind of nonmagnetic alloy of die casting.Half magnetic core 14 that is used for two magnetic tracks is by half clamper 12 supporting, and other half magnetic core 15 that is used for two magnetic tracks is by other half clamper, 13 supportings.
Fig. 2 represents clamper 12 half, and it has two positioning convex part 12a and 12a.Two magnetic core locating slot 12b and 12b do the both sides at these two bossings.Between two positioning convex part 12a and 12a, be a shield plate locating slot 12c.Two half magnetic cores 14 and 14 parts of being made up of composite wafer constitute.The part that this composite wafer is formed is by magnetic material, and for example the Fe-Ni-Nb alloy is made (iron-nickel-niobium alloy).The barricade 16 that is located between two half magnetic cores 14 and 14 is made up of a plurality of stacked non magnetic flat boards.These a plurality of stacked non magnetic flat boards are located on two surfaces of the flat board of being made by Fe-Ni-Mo (iron-nickel-molybdenum) alloy or other magnetic material the same with shield shell.Equally, in other half clamper 13, placing and supporting half magnetic core 15 and 15 that two parts of being made up of laminated sheet constitute.And between two half magnetic cores 15 and 15, laying a shield plate 16.
Two coil formers 17 and 17 are inserted in the magnetic core seat.Two half magnetic cores 15 are connected with this magnetic core seat with 15.Two coils 18 and 18 be wrapped in coil former 17 and 17 excircles around.As shown in Figure 2, binding post 19a and 19b inwardly stretch out from two coil formers 17 and 17, and other comprehensively is a single public binding post 19c from two coil formers 17 and 17 binding posts that stretch out.
The seat 12d of half clamper 12 extends to the back of shield shell 11.And this 12d has an one rotating shaft 21.Revolving shaft 21 is made this a integral part.In other words, this revolving shaft 21 is made by die casting, and therefore, it and this half clamper 12 are combined into one.A mating groove 21a and a gear mounting portion 21b have been at the far-end of revolving shaft 21.Back-up ring 22 (see figure 3)s cooperate with this mating groove 21a, and gear 23 (see figure 3)s are fixed on the 21b of gear mounting portion with spline fitted, make magnetic head assembly HB1 can rotate 180 °.
As depicted in figs. 1 and 2, on the seat 12d of half clamper 12, have two revolution block bossing 12e and 12f, be used for the orientation setting.These two bossings extend in the Y direction.Revolving shaft 21 and half clamper 12 are made an integral body.As shown in Figure 2, two revolutions block bossing 12e and 12f are placed on the both sides of the centre of gyration O of revolving shaft 21 in the Y direction.The stop-surface K of revolution block bossing 12e and 12f and the direction of L be on this same direction (this side among Fig. 2 or Fig. 1 are left) respectively.Two stop-surface K and L make they are alignd with the surperficial a of the seat 12d of half clamper 12.In addition, in this embodiment, as shown in Figure 5, half magnetic core 14 is connected surperficial 14a and 14a and corresponding surperficial a, K and L alignment with 14 gap.As shown in Figures 2 and 3, two revolutions block bossing 12e and 12f make the direction at Z each other, on the diverse location of promptly parallel with the centre of gyration O of revolving shaft 21 direction.More particularly, revolution block bossing 12f places more near a slidingsurface 11a of shield shell 11 than revolution block bossing 12e, and like this, stop-surface K and L can be not overlapping in the Z direction.
The tape guidance device of being made by sheet metal 24 is placed on the side of shield shell 11, and uses a kind of fixing means, and for example spot welding or glue are bonding, and is fixing.
In the process of magnetic head assembly HB1 assembling, two half magnetic cores 14 and 14 and shield plate 16 place and remain on the facing surfaces of half clamper 12, as shown in Figure 2.This half clamper 12 is half clamper that has the revolving shaft made from its integral body 21.Equally, two half magnetic cores 15 and 15 and shield plate 16 place and remain on half clamper 13.
When half magnetic core 14 and 14 and shield plate 16 when remaining on half clamper 12, half magnetic core 14 and 14 and shield plate 16 usefulness resin adhesives be bonded on half clamper 12.Afterwards, be connected the surface 14a and 14a and shield plate 16 of corresponding half magnetic core 14 and 14 far-ends pass through grindings, thereby have formed at clearance G 1 and G2 place, in the face of the part of magnetic core.At this moment, the surperficial a on the seat 12d of half clamper 12 makes to connect surperficial 14a and 14a and surperficial a with connecting surperficial 14a and 14a grinding, connects on the surperficial 0g-0g in gap shown in Figure 1, is in alignment with each other.Therefore, the revolution block bossing 12e of half clamper 12 and the stop-surface K of 12f and L cooperate with surperficial a, and connect surperficial 14a and 14a alignment.Equally, remain on other half clamper 13 half magnetic core 15 and 15 and shield plate 16 also fix with resin adhesive.And half magnetic core 15 and 15 far-ends be connected surface 15a and 15a also wants grinding.
Then, half clamper 12 is connected with 13, make half magnetic core 14 with 14 be connected surface 14a and 14a and half magnetic core 15 with 15 be connected surface 15a and 15a cooperation.At this moment, coil former 17 and 17 inserts in the seat of corresponding half magnetic core.Half magnetic core 14 with 14 be connected surface 14a and 14a, by a kind of nonmagnetic adhesives, be connected with 15a with 15 the surface 15a that is connected with half magnetic core 15, thereby form two clearance G 1 and G2.Half clamper 12 be connected with 13 finish after, just formed magnetic core.This magnetic core constitutes the magnetic circuit of a sealing.Obviously, when two half clampers 12 with 13 and half magnetic core 14 when 15 are connected, two clearance G 1 and G2 are at the relative position of the centre of gyration O of the center of track width direction (Y direction) and this revolving shaft 21, and promptly the interval δ 1 shown in Figure 23 A can be provided with very accurately.
Half clamper 12 that connects and 13 assembly along the Z direction, insert from the back of shield shell 11.At this moment, half clamper 13 contacts with localization part 11b on the inside surface in the left side of shield shell shown in Figure 1, and sheet spring 25 compresses two half clampers on above-mentioned contact direction.Like this, two half clampers 12 and 13 are put into shield shell 11.Under this condition, shield shell 11 has been full of the resin of fusion, for example epoxy.And half clamper 12,13 and half magnetic core 14,15 and some other parts are fixed on this shield shell 11 inside.When all parts are all installed and are fixed in the shield shell 11, with the slidingsurface 11a milled-in curves surface of shield shell 11.
Half clamper 12,13, half magnetic core 14,15, shield plate 16 and coil former 17 keeps also being fixed in the shield shell 11, to be configured for recording and the independent magnetic head unit Ha of playback.In this embodiment, revolving shaft 21 is directly installed on this independent magnetic head unit Ha.
This embodiment can eliminate (d) shown in Figure 24, (e), and (f), (g), (h) and (i) cumulative limit.More particularly, between the central point of the axis centre of revolving shaft 21 and clearance G 1 and G2 track width at the interval of Y direction, be 1 manufacturing dimension precision of the δ shown in Figure 23 A [tolerance of (a) among Figure 24] by half magnetic core 14, half magnetic core 14 be installed in half on the clamper 12 installation accuracy [tolerance of (b) among Figure 24] and half clamper 12 and revolving shaft 21 are made one dimensional accuracy [tolerance of (c) among Figure 24] decide, like this, can obtain point-device interval δ 1.Like this, when the magnetic head assembly HB1 that is made of this independent magnetic head unit Ha and revolving shaft 21 assembles, do not need position fixing process.
As shown in Figure 3, tape guidance device 14 and independent erase magnetic head parts Hb are installed on independent recording/playback head parts Ha, to finish this magnetic head assembly HB1.Then, magnetic head assembly HB1 is installed on the rest pad 31.
Rest pad 31 is fixed on the magnetic head seat of mechanical part of automatic reverse type recorder.This rest pad 31 utilizes molding synthetic resin to form, or forms in die cast with alloy.Rest pad 31 has a bearing 32.Bearing 32 is fitted on the rest pad 31.At the front end of two lateral parts of rest pad 31, integrally make two tape guidance devices 33,33.Directly over the bearing 32 of rest pad 31, integrally make a keeper 34.Fig. 4 represents the zoomed-in view of this keeper 34.Keeper 34 has one first locating surface 34a and one second locating surface 34b.Two locating surface 34a and 34b are placed on the diverse location of Z direction, and locating surface 34a and 34b are in alignment with each other.Two locating surface 34a are also consistent with the Y-Z plane of centre of gyration O that comprises bearing 32 and revolving shaft 21 with 34b.
In magnetic head assembly HB1, revolving shaft 21 inserts in the bearing 32 rotationally.At the back side of rest pad 31, back-up ring 22 cooperates with the mating groove 21a of revolving shaft 21, in case non-return rotating shaft 21 is deviate from.Gear 23 cooperates, and is fixed on the 21b of gear mounting portion.
In the mechanical part of automatic reverse type recorder, magnetic head assembly HB1 wherein has been installed, when tape forwards to, when being the operation of F direction, torsionsprings etc. promote this magnetic head assembly HB1 along the α direction, and the stop-surface K of revolution block bossing 12e is pressed on the first locating surface 34a, has so just determined the revolution posture of this magnetic head assembly HB1, as shown in Figure 5.When the traffic direction tape switches to reverse direction, promptly during the R direction, give gear 23 1 moments along the β direction, magnetic head assembly HB1 rotates 180 ° in the β direction round revolving shaft 21.At this moment, because the effect of the added expulsive force of above-mentioned torsionspring, the stop-surface L of revolution block bossing 12f is pressed on the second locating surface 34b, thereby has determined the posture of magnetic head assembly HB1.
As depicted in figs. 1 and 2, stop-surface K and the L of two of magnetic head assembly HB1 revolution block bossing 12e and 12f will carry out machining, make they and the connection surface 14a of half magnetic core 14,14, and 14a aligns.The first locating surface 34a and the second locating surface 34b shown in Figure 4 are in alignment with each other, and two locating surface 34a, 34b also with the Y-Z planar registration of the centre of gyration O that has comprised revolving shaft 21.Therefore, when stop-surface K contacts with the first locating surface 34a, and stop-surface L is when contacting with the second locating surface 34b, and at magnetic gap G1, it is consistent with the Y-Z plane that the magnetic core at G2 place connects the surface.Like this, when tape during, no longer need the position angle of adjusting play in the operation of F or R direction.The surface that is connected of clearance G 1 and G2 can be accurately meets at right angles with the traffic direction of tape.
Therefore, the magnetic head assembly HB1 of the foregoing description in the assembling process of independent magnetic head unit Ha, does not need positioning process.Simultaneously, after the mechanical part of automatic reverse type recorder was installed on the rest pad 31, the gap of this mechanical part no longer needed to carry out the method adjustment.In addition, when magnetic head assembly HB1 is installed on the mechanical part, between the centre of gyration O of magnetic head assembly HB1 and the center of clearance G 1 and G2, in the distance of Y direction near the ideal value δ 1 shown in Figure 23 A.Like this, can prevent clearance G 1 and G2,, depart from original position with respect to tape T in track direction.In addition, when tape during, can very accurately make clearance G 1 and traffic direction relative the be configured to right angle of G2 for tape respectively in the operation of F direction and R direction.
Fig. 6 represents another configuration example of rest pad.
Rest pad 35 shown in Figure 6 is made by crooked sheet metal.Mounting portion 35a is fixed on the magnetic head seat of mechanical part of automatic reverse type recorder.Rest pad 35 has the through hole 36 and 36 that two bearings are used.Two through holes are located on two flat boards parallel with respect to each other., and magnetic head assembly HB1 is rotatably inserted in dead eye 36 and 36.Back-up ring 22 and gear 23 are installed in the far-end of revolving shaft 21.Rest pad 35 has keeper 37 and 38, this two keeper forward end bending.The side of keeper 37 is provided with the first locating surface 37a, and the side of keeper 38 is provided with the second locating surface 38a.Two locating surface 37a and 38a are in alignment with each other on the Y-Z plane of the centre of gyration O that comprises revolving shaft 21.The first locating surface 37a and the second locating surface 38a and the first locating surface 34a and the second locating surface 34b shown in Figure 4 adapt, and locating surface 37a contacts with L with the revolution block bossing 12e of this magnetic head assembly HB1 and the stop-surface K of 12f with 38a.
Fig. 7 represents a magnetic head assembly HB2, and it is an improved form of the magnetic head assembly of first embodiment shown in Figure 1.The difference of magnetic head assembly HB2 shown in Figure 7 and magnetic head assembly shown in Figure 1 is that revolving shaft 21 is placed on the diverse location of directions X, and the remainder of revolving shaft 21 and revolving shaft shown in Figure 1 are identical.
In magnetic head assembly HB2 shown in Figure 7, with shown in Figure 1 the same, half clamper 12,13 is placed in the shield shell 11, and half magnetic core 14 and shield plate 16 remain on half clamper 12, and half magnetic core 15 and shield plate 16 remain in half clamper 13.The coil former 17 that is wound with coil 18 is inserted in the pedestal of magnetic core.Half clamper 14 and 15 is connected to each other in the magnetic core pedestal.
On the pedestal 12d of half clamper 12, revolution block bossing 12e and 12f in the Y direction, integrally do on two sides.The pedestal 12d of half clamper 12 also has revolving shaft 21, and it is made is an integral part of this half clamper 12.Yet in Fig. 7, revolving shaft 21 is made like this, and promptly it connects surperficial 0g-0g in the directions X standoff, makes this gap connect surperficial 0g-0g and passes through in the xsect outside of revolving shaft 21.
In magnetic head assembly HB2 shown in Figure 7, after half magnetic core 14 and shield plate 16 keep and be fixed on half clamper 12, carry out grinding, the connection surface 14a and the shield plate 16 of half magnetic core 14 are alignd with surperficial a.Stop-surface K and the L of revolution block bossing 12e and 12f will process, and make them form a plane of coming out continuously from surperficial a.At this moment because revolving shaft 21 departs from this gap and connects surperficial 0g-0g, so revolving shaft 21 not can with make half magnetic core 14 be connected surface 14a, surperficial a and stop-surface K and L alignment and the grinding work carried out interferes.
Magnetic head assembly HB2 shown in Figure 7 is bearing on the rest pad identical with the structure of rest pad shown in Figure 3 31 or rest pad 35 shown in Figure 6 rotationally.Revolving shaft 21 makes magnetic head assembly HB2 rotate 180 °, and revolution block bossing 12e or 12f and locating surface 34a, 34b or 37a, and the 38a contact makes this magnetic head assembly location.This is identical with Fig. 3 and situation embodiment illustrated in fig. 6.Therefore, the distance between centre of gyration O and the interstitial site can be set very accurately, and make this distance near the ideal value δ 1 shown in Figure 23 A.And,, can reach highly accurate recording or playback operation as in the embodiment situation shown in Figure 1.
In the embodiment shown in fig. 7, the position of revolving shaft 21 connects surperficial 0g-0g in the gap that directions X departs from this independent magnetic head unit Ha.Preferably, the position of revolving shaft 21 connects surperficial 0g-0g with respect to the gap, departs from towards the side surface that is connected with independent erase magnetic head parts Hb.As shown in Figure 7, in a composite magnetic head that combines this independent recording/playback head parts Ha and this independent erase magnetic head parts Hb, be arranged on one more on the position near the center of two independent magnetic head unit Ha and Hb by axial centre O, can improve the revolution equilibrium state of two independent magnetic head unit Ha and Hb revolving shaft 21.
Fig. 8 represents a magnetic head assembly HB3, and it is another improved form of first embodiment shown in Figure 1.
To a plurality of embodiment situations shown in Figure 7, stop-surface K and the L of revolution block bossing 12e and 12f will process at Fig. 1, and they are alignd with the surface 14a that is connected of half magnetic core 14.Like this, when tape running direction switch with magnetic head assembly when rest pad rotates 180 °, do not need to adjust the orientation of magnetic head.Yet magnetic head assembly HB3 shown in Figure 8 includes orientation adjustment.
The structure of magnetic head assembly HB3 shown in Figure 8, except the shape of revolution block bossing, identical with structure embodiment illustrated in fig. 1.More particularly, half clamper 12 and half clamper 13 are inserted in the shield shell 11, and half magnetic core 14 and shield plate 16 remain in half clamper 12, and half magnetic core 15 and shield plate 16 remain in half clamper 13.The pedestal 12d of revolving shaft 21 and half clamper 12 makes an integral body.
In Fig. 8, revolution block bossing 12g makes the integral part of the pedestal 12d that is half clamper 12.Revolution block bossing 12g, along directions X, outwards outstanding in the center of the side of shield shell 11.
Magnetic head assembly HB3 is installed on the rest pad shown in Figure 9 41.The revolving shaft 21 of magnetic head assembly HB3 is bearing in the bearing that is located on the rest pad 41 rotationally.Adjust screw 42 and 43, promote in the Y direction by a slice spring 44, for two that are fixed on the rest pad 41 to prevent screw loosening.When tape forwards to operation, i.e. F direction when operation, revolution block bossing 12g is pressed on the far-end of this adjustment screw 42 by added expulsive forces such as torsionsprings.Under this condition, rotate to adjust the posture that stops that screw 42 can change magnetic head assembly HB3, thereby can adjusting play G1 and G2 with respect to the opposed angle of tape.
When tape in the opposite direction, i.e. in R direction when operation,, magnetic head assembly HB3 rotates 180 ° around revolving shaft 21 clockwise direction.The added expulsive force of torsionspring makes revolution block bossing 12g contact with the far-end of adjusting screw 43.Under this condition, rotate to adjust screw 43 can adjusting play G1 and G2 with respect to opposed angle at the tape of R direction operation.
Though, in Fig. 8 and Fig. 9, comprised the orientation angles adjustment, still, in this embodiment, with the same to each embodiment shown in Figure 7 at Fig. 1, revolving shaft 21 and half clamper 12 integral body are made, and therefore, can eliminate (d) shown in Figure 24, (e), (f), (g), (h) and (i) cumulative limit.As a result, it is minimum that the scale error of the distance between centre of gyration O and clearance G 1 and the G2 can reduce to, and like this, can very accurately set the gap delta 1 shown in Figure 23 A.
At Fig. 1, among all each figure of Fig. 7 and Fig. 8, it is an integral part of half clamper 12 that revolving shaft 21 is all made.This half clamper 12 is to use die casting.As another alternative plan, for example, the pedestal of revolving shaft or make holistic axle pedestal with revolving shaft and can utilize bonding or welding is connected with this half clamper.In this case, by the fixed position of revolving shaft on this half clamper very accurately is set, also can avoid cumulative limit.Half clamper 12 and 13 can be made by sheet metal.In this case, half clamper can have sweep.The pedestal of revolving shaft is by riveted joint, and spot welding or other similar approach are fixed on this sweep.
Figure 10 represents a magnetic head assembly HC1, and it is second embodiment of second aspect of the present invention.
In the magnetic head assembly HC1 of second embodiment, the revolving shaft 21 of metal is fixed on the shield shell 11.A side of shield shell 11 bends to the right angle in the back of independent magnetic head unit Ha, and it is vertical to make this side be connected surperficial 0g-0g with the gap.Minor diameter part 21c in revolving shaft 21 proximal ends closely cooperates with the mating holes 11d that does in sweep 11c, and revolving shaft 21 is fixed by rivet portion 21d.
The inner structure of shield shell 11 is identical to the inner structure of shield shell embodiment illustrated in fig. 8 with Fig. 1.Half magnetic core 14 and shield plate 16 remain in half clamper 12, and half magnetic core 15 and shield plate 16 remain in half clamper 13.Then, two half clampers 12 and 13 are coupled together, and each part in the shield shell 11 is fixed with pouring fusion epoxy resin sill in the shield shell or other similar molten resin material into.
Half clamper 12 that has coupled together and 13 is pressed on the localization part 11b on the inside surface of shield shell 11 by sheet spring 25, and adds the resin of fusion, makes half magnetic core be positioned at this localization part 11b place.Like this, utilize localization part 11b to be benchmark, the fixed orifice 11d that gets out on the sweep 11c of shield shell 11 of processing might very accurately set up the relative position of the axis centre O of half clamper 13 and revolving shaft 21.
This embodiment can avoid (f) among Figure 24, (g) and (h) cumulative limit, and by accurately controlling half magnetic core 15, the dimensional tolerence of half clamper 13 and shield shell 11 and the installation dimension tolerance of these parts, make clearance G 1, the distance between the centre of gyration O of G2 and revolving shaft 21 is near the ideal value δ 1 shown in Figure 23 A.
Figure 11 is the sectional view of expression magnetic head assembly HC2, and it improves second embodiment shown in Figure 10.
In magnetic head assembly HC2 shown in Figure 11, the side plate of shield shell 11 extends towards the back side of independent magnetic head unit Ha, and the inside surface of this extension provides a datum clamp face 11e.Revolving shaft 21 uses nonmagnetic alloy to be made by die casting, or uses synthetic resin to be made by the injection mould method.Axle pedestal 21e makes the near-end at revolving shaft 21, is an integral part of revolving shaft 21.Axle pedestal 21e is by bonding, and welding or other similar approach are connected with the datum clamp face 11e of shield shell 11 and fix.
Improved form shown in Figure 11 is the same with magnetic head assembly shown in Figure 10, also can avoid (f) shown in Figure 24, and (g) and (h) cumulative limit makes clearance G 1, and the relative position of the centre of gyration O of G2 and revolving shaft 21 is near the ideal value δ 1 shown in Figure 23 A.Particularly in Figure 11, therefore localization part 11b and datum clamp face 11e can very accurately guarantee by half clamper 13 of localization part 11b location with by the relative position of the axle pedestal 21e of datum clamp face 11e location on the same inside surface of shield shell 11.
In addition, in Figure 10 and Figure 11, by being connected surperficial 0g-0g along the gap, separates shield shell 11, and directly with half magnetic core 14,15 and shield plate 16 directly place and remain on the inside surface of half housing of each part, to form this independent magnetic head unit Ha, also can avoid among Figure 24 (c) and (d) tolerance, and can very accurately set clearance G 1, the distance between G2 and the centre of gyration O.Yet, being directly installed on the shield shell if should be noted that half magnetic core and shield plate, the inside surface of the shield shell of being made by magnetic material is necessary for a nonmagnetic layer.
In Figure 11, the part of shield shell 11 can be embedded in and be fixed in the recess of work on axle pedestal 21e.
Figure 12 A and 12B represent a kind of improved form of the 3rd embodiment and the 3rd embodiment; The two all adapts with a third aspect of the present invention.
Shown in Figure 12 A, among the magnetic head assembly HD1 as the 3rd embodiment, curve L shaped as the sheet metal 45 of supporting member.The side of the shield shell 11 of independent recording/playback head Ha utilizes bondingly, and spot welding or other similar method are fixed on dull and stereotyped 45 the mounting portion 45a.The revolving shaft 21 that is made of metal utilizes methods such as rivet to be fixed on the supporting part 45b.Supporting part 45b bends to the right angle to installation surface 45a.The far-end of mounting portion 45a stretches out forward in the outside of the slidingsurface 11a of the shield shell 11 of independent magnetic head unit Ha, forms a tape guidance device 45a1.Identical with tape guidance device 24 shown in Figure 3, tape guidance device 45a1 also has the far-end of a U-shaped.Flexible wiring board 46 be connected with the binding post that Hb stretches out from corresponding magnetic head unit Ha separately.
In the magnetic head assembly HD2 as the improved form shown in Figure 12 B, the sheet metal 45 that plays the supporting member effect has a mounting portion 45a, a supporting part 45b (revolving shaft 21 just is installed on this supporting part 45b) and a supporting part 45c.Supporting part 45c bends to the right angle from supporting part 45b.Be used to record and the independent magnetic head unit Ha of playback and the independent erase magnetic head parts Hb that is connected with it remain between mounting portion 45a and the mounting portion 45c.
The inner structure of Figure 12 A and two embodiment shown in the 12B has the shield shell 11 identical with the inner structure of aforesaid any one embodiment, does not promptly have two half clampers 12,13 and two half magnetic cores 14,15.As another scheme, the inside surface of shield shell 11 can be a nonmagnetic layer, and half magnetic core 14,15 is directly placed and is fixed on this nonmagnetic layer.
In several embodiment shown in Figure 12, the shield shell 11 of independent magnetic head unit Ha is installed on the mounting portion 45a of flat board 45.This mounting portion 45a plays the supporting member effect.Revolving shaft 21 is fixed on the supporting part 45b of flat board 45.Like this, the clearance G 1 of work on the slidingsurface 11a of independent magnetic head unit Ha is with respect to the relative position of the centre of gyration O of revolving shaft 21, except (a) shown in Figure 24 to (e) tolerance, also comprise dull and stereotyped 45 manufacturing tolerance and the location tolerance that is installed in the independent magnetic head unit Ha on dull and stereotyped 45.This means and to eliminate (g) and (h) binomial tolerance, and the gap can be provided with more accurately with respect to the relative position of revolving shaft 21 than previous technology.
In addition, in two embodiment shown in Figure 12 A and the 12B, by in advance revolving shaft 21 being fixed on dull and stereotyped 45, adjust independent magnetic head unit Ha on the 45a of mounting portion, installation site along the Y direction, and after adjusting with independent magnetic head unit Ha bonding be fixed on the 45a of mounting portion, can make centre of gyration O and clearance G 1, the distance between the center of G2 is near the ideal value δ 1 shown in Figure 23 A.Therefore, adjust by simple position, can guarantee ideal value δ 1, like this, can adjust independent magnetic head unit Ha in the position of Y direction, the side of the shield shell 11 of the magnetic head assembly Ha that this is independent then is installed on the 45a of mounting portion.
Figure 13 represents the magnetic head assembly HD3 of the 4th embodiment, and it is corresponding to a third aspect of the present invention.
In this magnetic head assembly HD3, revolving shaft 21 is located on the bearing 48.Revolving shaft 21 can separate manufacturing with bearing 48, is fixed on the bearing 48 with press fit or other similar approach then.Then, preferably bearing 48 and revolving shaft 21 utilize alloy, by die casting or utilize synthetic resin, by annotating the molded making method of material as one.Recess 48a or hole are done in bearing 48, and the back side of the coupling part of this independent recording/playback head parts Ha and this independent erase magnetic head Hb insertion and be fixed among the recess 48a with bonding agent etc.
In this embodiment,, can cancel the axle pedestal 5 of prior art shown in Figure 22, and or else need the mounting hole 3b in the bearing 3 is cooperated with threaded hole 5a in the pedestal 5, in order to gib screw because revolving shaft 21 is installed on the bearing 48.Like this, can eliminate (g) and (h) secondary tolerance among Figure 24.
In addition, when assembling magnetic head assembly HD3 shown in Figure 13, revolving shaft 21 provides positioning reference.More particularly, utilize revolving shaft 21 to make benchmark, can move independent magnetic head unit Ha in the Y direction, then independent magnetic head unit Ha is fixed on the bearing 48, thereby make the clearance G 1 of independent magnetic head unit Ha, the distance between the centre of gyration O of G2 and revolving shaft 21 on the Y direction is near the ideal value δ 1 shown in Figure 23 A.In Figure 13, can be clear that independent magnetic head unit Ha and independent erase magnetic head Hb then are installed on the bearing 48 by the represented reference for installation of revolving shaft 21.Like this, can more easily adjust the independent position of magnetic head unit Ha on bearing 48.
Figure 14 represents the magnetic head assembly HE of the 5th embodiment, and it is corresponding to a fourth aspect of the present invention.
In magnetic head assembly HE, revolving shaft 21 is directly installed on the housing (clamping housing) 51 of independent erase magnetic head parts Hb.The housing 51 of independent erase magnetic head parts Hb is made by synthetic resin, and revolving shaft 21 can press fit and is fixed in the housing 51.Perhaps when utilizing synthetic resin to produce housing 51, utilize the insert moulding method, make revolving shaft 21 make an integral part of housing.In addition, also have a kind of method to be: to utilize synthetic resin, housing 51 and revolving shaft 21 are molded into one.
Locating surface 51a and 51b can do on a side surface of the housing 51 of independent erase magnetic head parts Hb, the right side of this side surface in Figure 14.The shield shell 11 of independent recording/playback head parts Ha is placed and is fixed on locating surface 51a and the 51b.This makes this independent magnetic head unit Ha locate in Z direction and directions X with respect to independent erase magnetic head parts Hb.Another kind of scheme is, can make a step part on the housing 51, is used to make this independent magnetic head unit Ha to locate in the Y direction.Like this, this independent magnetic head unit Ha is placed on this step part, this magnetic head unit is located in the Y direction.
In this embodiment, the positional precision of 21 distance only is decided by the manufacturing tolerance of housing 51 from shield shell 11 to revolving shaft, therefore can very accurately set clearance G 1, the interval between the centre of gyration O of G2 and revolving shaft 21.
In addition, under the situation of embodiment shown in Figure 14, can make benchmark by utilizing revolving shaft 21, make this independent magnetic head unit Ha in Y direction orientation, and this independent magnetic head unit Ha is placed on locating surface 51a and the 51b, utilize adhering method that this independent magnetic head unit Ha is fixed then, can make the interval between the centre of gyration O of gap and revolving shaft 21 be approximately the ideal value shown in Figure 23 A.
In the embodiment shown in fig. 14, can be by independent magnetic head unit Ha being placed on this independent erase magnetic head parts Hb, and fix this independent magnetic head unit Ha, and the relative position of this independent magnetic head unit Ha with respect to the axis centre of revolving shaft 21 very accurately is set.Also can utilize the revolving shaft 21 that is located on the independent erase magnetic head parts Hb as benchmark, go to adjust the position of this independent magnetic head unit Ha.
Figure 15 is a decomposition diagram, and it represents the revolving head device of the 6th embodiment according to a fifth aspect of the invention; Figure 16 is the longitdinal cross-section diagram that is located at the magnetic head on this revolving head device; The sectional view of Figure 17 for being got along III-III line shown in Figure 16.
In revolving head device HF shown in Figure 15, a recording/playback head Ha1 is directly installed on the axle pedestal 20.Revolving shaft 21 is fixed on this pedestal 20.Tape guidance device 4 directly is fixed on the side of shield shell 11 of magnetic head Ha1, and erase magnetic head Hb is fixed on the side of shield shell 11, and this side is on the side relative with a side fixing tape guidance device 4.Should be noted that after Figure 15 reaches and among each figure, omitted the figure of erase magnetic head.
The shield shell 11 of magnetic head Ha is by magnetic material, and for example Fe-Ni-Mo (iron-nickel-molybdenum) alloy is made.Shield shell 11 has one to expose window 11f at the distal surface of Z direction.Magnetic core can expose by this window.
Half clamper 72 and 73 is placed in the shield shell 11.In this embodiment, half clamper 72 and 73 is by crooked nonmagnetic metal plate, for example, corrosion resistant plate and making.In half clamper 72, sweep 72b does at magnetic core supporting part 72a on the far-end of Z direction, and the breach 72c that is used for exposing magnetic core does at sweep 72b.Two sides of magnetic core supporting part 72a curve the right angle, to form side plate 72d, 72d.As Figure 16 and shown in Figure 17, two side plate 72d, 72d stretches out at the rear side (at the near-end of Z direction) of shield shell 11.Side plate 72d, the near-end of 72d bends to the right angle in the shield shell outside, to form mounting portion 72e, 72e.Mounting portion 72e, 72e have mounting hole 72f, 72f.
In addition, the magnetic core supporting part 72a of half clamper 72 has two positioning convex part 72g and 72h.These two bossings are by pressing this magnetic core supporting part 72a from the outside or this part being caved in into and inside giving prominence to.The relative breach 72c with 72h of positioning convex part 72g places.
As shown in figure 16, the magnetic core supporting part 72a of half clamper 72 is supporting two half magnetic cores 14,14 and shield plate 16.The part that half magnetic core 14,14 is made up of a laminated sheet constitutes, and the part that this laminated sheet is formed is by magnetic material, and for example Fe-Ni-Nb (iron-nickel-niobium) alloy is made.Being located at two shield plate 16 between half magnetic core 14,14 is made by non magnetic flat board.This non magnetic flat board is by magnetic material, for example on two surfaces of the flat board made of Fe-Ni-Mo (iron-nickel-molybdenum) alloy, as shield shell, makes many stack of sheets.
As shown in figure 16, half magnetic core 14 is placed between the inward flange K of the outside surface of positioning convex part 72g and breach 72c, and half magnetic core of another part 14 is placed between the inward flange L of the outside surface of positioning convex part 72h and breach 72c.Shield plate 16 is placed between two positioning convex part 72g and the 72h, and the far-end of shield plate 16 flexibly is clamped between two half magnetic cores 14,14.
Half magnetic core 14,14 and shield plate 16 are placed on and are bearing on the magnetic core supporting part 72a of half clamper 72, and they are fixing with bonding agent etc.Half magnetic core 14,14 and shield plate 16 are fixing, and the gap of half magnetic core of grinding 14,14 connects surperficial 14a, 14a be connected surface 14b, 14b, the connection of also grinding shield plate 16 surface 16a simultaneously at far-end.
In half clamper of another part 73, magnetic core supporting part 73a is provided with sweep 73b at the far-end of Z direction, and breach 73c does in sweep 73b.Two side cambers of magnetic core supporting part 73a form two lug 73d, 73d.Magnetic core supporting part 73a also has two positioning convex part 73g, 73h, and they are by making to suppressing or they being caved inward.Breach 73c and positioning convex part 73g, 73h make and make them to breach 72c and positioning convex part 72g, 72h surface symmetry.
Being placed on half magnetic core 15,15 between two half magnetic cores 15,15 and shield plate 16 places and is fixed in half clamper 73.Omit half magnetic core 15,15 among Figure 15 and placed and be fixed on the figure of half shield plate 16 in the clamper 73.Half magnetic core 15,15 and shield plate 16 be by the breach 73c and the positioning convex part 73g of half clamper 73, the 73h location, and this is identical with the localization method of shield plate 16 with half magnetic core 14,14 in half clamper 72 shown in Figure 16.Half magnetic core 15,15 and shield plate 16 are placed and are fixed in half clamper 73 with bonding agent etc.Then, the gap of half magnetic core of grinding 15,15 connects surperficial 15a, at the surperficial 16a that is connected of surperficial 15b of the connection of far-end and shield plate 16.
Half clamper 73 is connected with half clamper 72, makes lug 73d, 73d and side plate 72d, the shoulder part M of 72d, M unanimity.At this moment, the connection of half magnetic core 14,15 surface 14a, 15a also couples together respectively, and at the connection surface of near-end 14b, 15b also couples together, and the shield plate 16 that is fixed on two half clampers 72 and 73 also couples together.When half magnetic core 14,14 and half magnetic core 15,15 connection, coil former 17 is inserted on the pedestal of half magnetic core.Coil 18 is wrapped on the coil former 17, and a plurality of binding posts 19 are protruding at the near-end of shield shell 11.
The connection surface 14a of half magnetic core 14,14,14a is by the connection surface 15a of nonmagnetic substance and half magnetic core 15,15, and 15a connects, to form magnetic gap G1 and G2.At the connection at half magnetic core 14,14 pedestal place surface 14b, 14b directly with connection surface 15b at the pedestal place of half magnetic core 15,15,15b connects.Half magnetic core 14,14 and half magnetic core 15,15 be connected to form magnetic core.This magnetic core constitutes the magnetic circuit of a sealing.
Half clamper 72,73 is connected to each other, and fixes with resin adhesive.Connect and fixing half clamper 72,73,, insert in the shield shell 11 along the Z direction from the back of shield shell 11.At this moment, when half clamper 73 when localization part 11g on the inside surface at the shield shell 11 on Figure 17 left side contacts, sheet spring 25 compresses two half clampers towards the contact direction.This makes two half clampers 72 and 73, in shield shell 11 positioned internal.Under this condition, the molten resin of epoxy resin or other form is added in this shield shell 11, with half clamper 72,73, half magnetic core 14,15 and other part are fixed in the shield shell 11.
As Figure 16 and shown in Figure 17, the shield plate 16,16 among the exposure window 11f of the far-end of half magnetic core 14,15 and the distal surface 11a that gives prominence at shield shell 11, the inside that exposes window 11f also has been full of the resin of fusion.Then, the distal surface 11a of shield shell 11 is worn into the surperficial S shown in the dotted line among Figure 17.The surperficial S that is drawn by grinding provides magnetic medium, i.e. the surface that can slide thereon of tape.
In the magnetic head Ha1 of present embodiment, mounting portion 72e, 72e are outstanding in shield shell 11 back.Mounting portion 72e, 72e and half clamper 72 are made an integral body.Half magnetic core 14,14 is placed and is fixed on half clamper 72.Like this, the connection of half magnetic core 14,14 surface 14a, 14a, i.e. magnetic gap G1, G2 and mounting hole 72f, position relation between the 72f can decide according to the manufacturing dimension precision of half magnetic core 14,14 and half clamper 72 and the installation accuracy of half magnetic core 14,14 and half clamper 72.As shown in figure 16, half magnetic core 14,14 can be by the breach 72c and the positioning convex part 72g of half clamper 72,72h very accurately locatees, therefore, and magnetic gap G1, G2 and mounting hole 72f, the relative position of 72g almost are the manufacturing accuracy decisions by half clamper 72.This can make mounting hole 72f, 72f and magnetic gap G1, and the relative position of G2 is very accurate.
After half magnetic core 14,14 and shield plate 16 are placed and be fixed in half clamper 72, grinding half magnetic core 14,14 and shield plate 16.Utilize mounting hole 72f, 72f is as benchmark, and the connection of half magnetic core of grinding 14,17 surface 14a, 14a can very accurately set by connecting surperficial 14a, the magnetic gap G1 that 14a constitutes, G2 and mounting hole 72f, the distance between the 72f.
In revolving head device HF shown in Figure 15, Figure 16 and magnetic head Ha1 shown in Figure 17 pass through mounting portion 72e, and 72e is installed on the pedestal 20; Axle pedestal 20 and revolving shaft 21 are generally by rest pad 31 supportings.
The bottom surface 31a of rest pad 31 is fixed on the magnetic head seat on the mechanical part that is located at automatic reverse type recorder.Revolving shaft 21 is bearing on the bearing 32 of rest pad 31 rotationally.In the back of rest pad 31, a gear is installed on the revolving shaft 21, and the moment that is added on the gear makes revolving shaft 21 and 20 revolutions of axle pedestal.Gear makes revolving shaft 21 rotate an angle that is predetermined in α direction and β direction, and later torsionspring gives revolving shaft 21 along α direction or β direction with expulsive force.
In mechanical part, axle pedestal 20 has been installed on the rest pad 31 that is positioned on the magnetic head seat, and magnetic head Ha1 is installed on the pedestal 20.At this moment, mounting screw is inserted in mounting portion 72e, the mounting hole 72f that gets out on the 72e among the 72f, and is screwed into the threaded hole 20a that makes on the pedestal 20 with mounting screw, among the 20a.Like this, utilize mounting hole 72f, 72f makes benchmark, magnetic head Ha1 can be installed on the pedestal 20.
Axle pedestal 20 has a block bossing 26, and it is outwards outstanding at radial direction, and makes an integral part of a pedestal 20.Rest pad 31 has two screw 39a, and 39b is used to adjust the magnetic head orientation.When tape in the F direction, promptly forwards to when operation, the side 26a of block bossing 26 is pressed in by the effect of torsionspring expulsive force and adjusts on the screw 39a.At this moment, rotate and adjust screw 39a, the far-end of screw is moved forwards or backwards, to adjust the clearance G 1 of magnetic head Ha1, G2 is with respect to the orientation angles of the tape that moves in the F direction.When the traffic direction of tape switches to the R direction, promptly during reverse directions, revolving shaft 21 rotates in the β direction, the side 26b of block bossing 26 is pressed in adjusts on the screw 39b.Rotate and adjust screw 39b, with adjusting play G1, G2 is with respect to the orientation angles of the tape that moves in the R direction.
Relatively pointing out of the example of this embodiment and common technology shown in Figure 22 to magnetic head Ha1 shown in Figure 17, cancelled bearing 3 at Figure 15.More particularly, in fact bearing makes an integral body with half clamper 72.Therefore, in the revolving head device HF of present embodiment, can eliminate shown in Figure 24ly, from clearance G 1, G2 is to (d) of the distance of the centre of gyration O of revolving shaft 21, (e), and (f) and (g) cumulative limit.Therefore, very accurately guarantee mounting portion 72e, the relative position of 72e and axle pedestal 20, and they fixing can be guaranteed to set accurately centre of gyration O and clearance G 1, between the G2 in the distance of Y direction, thereby make this distance near the ideal value δ 1 shown in Figure 23 A.In addition, do not needed therefore can easily make high-precision revolving head device as in the common example of technology shown in Figure 22, proofreading and correct the position of magnetic head with respect to pedestal 3.
To the embodiment shown in Figure 17, owing to utilize the mode of pressed metal sheet material to make half clamper 72 and 73, therefore half clamper 72 and 73 manufacturing cost can reduce greatly at Figure 15.Yet another kind of method is can make clamper half by a kind of nonmagnetic alloy of die casting, shown in Figure 18 A～C.
Figure 18 A～C represents a kind of half clamper 82 of die casting, and it can be used to replace the clamper 72 in the foregoing description: Figure 18 A is for from connecting the front view that a surperficial side is seen, Figure 18 B is a vertical view, and Figure 18 C is a side view.
This half clamper 82 has and by the same basic structure of half clamper 72 of sheet metal system.Magnetic core rest pad 82a has one and is used to make half magnetic core 14,14 and the breach 82C of shield plate 16 location and the positioning convex part 82g that makes with magnetic core rest pad 82a integral body, 82h.Embodiment as shown in Figure 16 is the same, and half magnetic core 14 is by inward flange and the positioning convex part 82g location of breach 82c; Half magnetic core of another part 14 is by inward flange and the positioning convex part 82h location of breach 82c, and shield plate 16 is placed between positioning convex part 82g and the 82h.
Half clamper of the pairing that is connected with half clamper 82 is also made by the die casting nonmagnetic alloy.Half magnetic core 15,15 and shield plate 16 are placed and are fixed in half clamper.When being inserted in the shield shell 11 with half clamper 82 of being connected of half clamper of pairing, and with the resin of fusion fixedly the time, the mounting portion 82e of half clamper 82 shown in Figure 18 A～C, 82e give prominence to outside the back side of shield shell.Mounting hole 82f, 82f gets out on the 82e at mounting portion 82e.
Utilize the magnetic head Ha1 of half clamper 82 shown in Figure 18 A～C also can make mounting hole 82f, 82f and clearance G 1, the relative position of G2 is very accurate.
Use the magnetic head Ha1 of half clamper 82 to be installed on the axle pedestal 20 of revolving head device shown in Figure 15, and be inserted in mounting hole 82f, the mounting screw among the 82f is screwed into threaded hole 20a, among the 20a, magnetic head Ha1 is fixed on the pedestal 20.
The mounting portion 82e of half clamper 82 of die casting does thicklyer, make by with the enlarged-diameter of the lip-deep mounting hole 82f of mounting portion 82e and the location indentations 82i that forms can be inserted in the pedestal 20, as shown in figure 19.Positioning convex part 20b integrally makes the front end at axle pedestal 20, and threaded hole 20a gets out in positioning convex part 20b.Be arranged to make them to be combined together the diameter of bossing 20b and recessed part 82i, very close to each otherly just can very accurately make mounting portion 82e, 82e places and is fixed on the pedestal 20.
Therefore, can further control dimensional tolerence shown in Figure 24 (h), make the centre of gyration O and the magnetic gap G1 of revolving shaft 21, the distance between the G2 on the Y direction can be near the ideal value δ 1 shown in Figure 23 A.
Figure 20 is a skeleton view, the magnetic head Ha2 of the 7th embodiment that its expression and a fifth aspect of the present invention adapt.
In the present embodiment, two side plate 91d of shield shell 91,91d extends towards the back side of this magnetic head, and side plate 91d and 91d curve the right angle, to form mounting portion 91e, 91e.Mounting hole 91f, 91f gets out on the 91e at mounting portion 91e.
At first use the pulling method manufacturing in order to make the shell 91A that shield shell 91, half clampers and half magnetic core place within it, then, the outstanding side plate 91d towards shell 91A back, 91d forms with bending.Before half clamper of half magnetic core of supporting and shield plate inserts and is fixed in the shell 91A with molten resin, two half clampers are combined.
At this magnetic head spare, mounting portion 91e, 91e makes one in the shell 91A of shield shell 91, support half clamper of half magnetic core and place and be fixed among the shell 91A.Therefore, this structure is substantially the same with structure shown in Figure 22.In structure shown in Figure 22, bearing 3 is made with shield shell integral body.Therefore, can eliminate (f) shown in Figure 24 and (g) binomial tolerance.Half magnetic core is placed directly on the inside surface of shell 91A, does not use this half clamper can further eliminate (c) shown in Figure 24, (d), (f) and (g) cumulative limit.When on the inside surface of half magnetic core and shield plate directly being placed and be fixed on shield shell, on the inside surface of shield shell, make a nonmagnetic layer.For example, when using the magnetic be made up of a composite wafer is dull and stereotyped and non magnetic flat board is formed a kind of clad material or laminated flat to make shield shell, this non magnetic flat board has formed the inside surface of this shield shell, and half magnetic core and shield plate are installed on this non magnetic flat board.
Magnetic head Ha2 shown in Figure 20 is installed on the axle pedestal 20 shown in Figure 15, and the mounting screw that is inserted among the mounting hole 91f is screwed in threaded hole 20a, among the 20a, to constitute this revolving head device.This revolving head device has advantageously been cancelled bearing 3, thereby does not also need magnetic head is placed and is fixed on the bearing 3, and this also can make the centre of gyration O and the clearance G 1 of revolving shaft 21, and the relative position of G2 is very accurate.
Be only limited to be installed on the revolving head device according to magnetic head Ha1 of the present invention and Ha2, mounting portion 72e, 82e or 91e can be directly installed on the magnetic head seat or be located on the rest pad on the magnetic head seat of blattnerphone.In this case, because the distance from the mounting portion to the gap can highly precisely be provided with, the magnetic gap that is installed in the magnetic head on the blattnerphone can be with respect to tape, with good precision setting.
In according to a plurality of embodiment aspect of the present invention first to fourth, can make in two stop-surface of magnetic head side that to make them be not alignment, and also parallel with the connection surface 14a of half magnetic core 14.In this case, can very accurately make the connection surface in gap parallel with stop-surface, and make benchmark by utilizing stop-surface, the connection surface 14a of half magnetic core of grinding 14, or the surperficial 14a of the connection that utilizes half magnetic core 14 is as benchmark, the processing stop-surface, and can guarantee that the gap connects the point-device position relation between surface and the stop-surface.
As another alternative plan, the block bossing can be made an integral part of bearing shown in Figure 22 3, and magnetic head can be placed like this: promptly before being fixed on bearing on adhering method magnetic head, make the gap connect to align with the stop-surface of block bossing in the surface or parallel.In common example shown in Figure 22, the connection surface design of the clearance G a of magnetic head becomes and stop-surface 5c, and 5d is vertical, and the position of magnetic head just is difficult to guarantee to make the connection surface and stop-surface 5c of clearance G a like this, and 5d is vertical.Stop-surface 5c, 5d are benchmark in installation process.The present invention can make the position of magnetic head guarantee to make stop-surface surperficial parallel with the connection in gap or align.These characteristics are placed magnetic head and be bonded on the bearing easily.
In each above-mentioned embodiment, when stop-surface when locating surface on the rest pad side contacts, the direction of magnetic head has just determined, does not therefore need orientation adjustment mechanism.Yet, can have orientation adjustment mechanism shown in Figure 21 according to magnetic head assembly of the present invention.In this case, with common magnetic head assembly relatively, the scope of orientation adjustment is very little, therefore, a less setting range can be set and use special adjustment screw for meticulous adjustment design.Like this, can have than simpler orientation adjustment mechanism in the common device and adjustment faster.

Claims (4)

1. magnetic head assembly, it comprises:
A magnetic head, it comprises a magnetic core that is used to form the gap in a housing; With
A rest pad, it is bearing on the described magnetic head rotationally;
When described magnetic head rotated 180 °, the contact position between described gap and the magnetic medium changed;
Wherein, described magnetic head has two stop-surface, and the gap of these two stop-surface and described magnetic core connects surface in alignment or parallel, and stop-surface is in alignment with each other or parallel;
Described rest pad has one first localization part and one second localization part; A surface in described two stop-surface contacts with first localization part, and when described magnetic head rotates 180 ° and when reaching two extreme positions, another stop-surface contacts with second localization part.
2. a kind of magnetic head assembly as claimed in claim 1, wherein, described two stop-surface are placed on two sides of the revolving shaft of this magnetic head respectively, and on same direction, and described two stop-surface can not overlap each other them in the position of described revolving shaft axis direction.
3. a kind of magnetic head assembly as claimed in claim 1, wherein, stop-surface and one are placing magnetic core, and the part that is fixed on the magnetic head is made an integral body.
4. a kind of magnetic head assembly as claimed in claim 1, wherein, revolving shaft that magnetic head rotates and stop-surface are installed and the part fixed is made an integral body with magnetic head, and the external peripheral surface of described revolving shaft is placed into and make it not be connected surface in alignment with described gap.
CN96109388A 1995-08-09 1996-08-09 Magnetic head and magnetic head apparatus Expired - Fee Related CN1069772C (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
JP203387/95 1995-08-09
JP203421/95 1995-08-09
JP203408/95 1995-08-09
JP20340895 1995-08-09
JP203408/1995 1995-08-09
JP203387/1995 1995-08-09
JP20342195A JPH0954927A (en) 1995-08-09 1995-08-09 Magnetic head device
JP203421/1995 1995-08-09
JP20338795A JPH0954926A (en) 1995-08-09 1995-08-09 Magnetic head device

Related Child Applications (2)

Application Number Title Priority Date Filing Date
CN 00120909 Division CN1227651C (en) 1995-08-09 1996-08-09 Magnetic head and magnetic head device
CN 00120908 Division CN1201291C (en) 1995-08-09 2000-08-01 Magnetic head device

Publications (2)

Publication Number Publication Date
CN1145513A CN1145513A (en) 1997-03-19
CN1069772C true CN1069772C (en) 2001-08-15

Family

ID=27328231

Family Applications (4)

Application Number Title Priority Date Filing Date
CN 00120909 Expired - Fee Related CN1227651C (en) 1995-08-09 1996-08-09 Magnetic head and magnetic head device
CNA2003101005574A Pending CN1516116A (en) 1995-08-09 1996-08-09 Magnetic head device
CN96109388A Expired - Fee Related CN1069772C (en) 1995-08-09 1996-08-09 Magnetic head and magnetic head apparatus
CN 00120908 Expired - Fee Related CN1201291C (en) 1995-08-09 2000-08-01 Magnetic head device

Family Applications Before (2)

Application Number Title Priority Date Filing Date
CN 00120909 Expired - Fee Related CN1227651C (en) 1995-08-09 1996-08-09 Magnetic head and magnetic head device
CNA2003101005574A Pending CN1516116A (en) 1995-08-09 1996-08-09 Magnetic head device

Family Applications After (1)

Application Number Title Priority Date Filing Date
CN 00120908 Expired - Fee Related CN1201291C (en) 1995-08-09 2000-08-01 Magnetic head device

Country Status (1)

Country Link
CN (4) CN1227651C (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61271611A (en) * 1985-05-25 1986-12-01 Mitsubishi Electric Corp Rotary head assembly for magnetic recording and reproducing device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61271611A (en) * 1985-05-25 1986-12-01 Mitsubishi Electric Corp Rotary head assembly for magnetic recording and reproducing device

Also Published As

Publication number Publication date
CN1292544A (en) 2001-04-25
CN1201291C (en) 2005-05-11
CN1516116A (en) 2004-07-28
CN1292545A (en) 2001-04-25
CN1227651C (en) 2005-11-16
CN1145513A (en) 1997-03-19

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