CN1032334C - Thin film transducer/transformer device - Google Patents
Thin film transducer/transformer device Download PDFInfo
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- CN1032334C CN1032334C CN 91105857 CN91105857A CN1032334C CN 1032334 C CN1032334 C CN 1032334C CN 91105857 CN91105857 CN 91105857 CN 91105857 A CN91105857 A CN 91105857A CN 1032334 C CN1032334 C CN 1032334C
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- transducer
- coil
- transformer
- magnetic pole
- pole member
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Abstract
The present invention relates to a thin film transducer/transformer assembly which comprises a thin film magnetic transducer formed in a first position and a thin film transformer formed in a second position, wherein the thin film magnetic transducer and the thin film transformer are both arranged on the supporting surface of a base plate. The transducer and the transformer are respectively provided with a conductive coil. The transducer comprises a bottom magnetic pole component, a top magnetic pole component and the conductive coil partially arranged between the top magnetic pole component and the bottom magnetic pole component. The transformer comprises a bottom magnetic pole component, a top magnetic pole component forming a closed magnetic circuit with the bottom magnetic pole component and the conductive coil arranged between the top magnetic pole component and the bottom magnetic pole component. The transducer coil and the transformer coil are electrically coupled in the following mode: the amplitude of outputting signals provided by the transformer coil is increased over the amplitude of generating signals by the transducer coil.
Description
The present invention relates to the thin film transducer of existing the sort of type in the small-size computer disc driver.
The thin film magnetic transducer that is used for data are write and read disk in disc driver is known.Typical thin film transducer contains a pair of connecing in the first area that is commonly referred to the back clearance district and is incorporated in the pole piece that the opposed area that is commonly referred to the polar cusp separates.In the middle of back clearance district and polar cusp, pole piece is separately so that hold electronic coil with the pole piece electrical isolation.This coil is electrically connected to relevant read/write circuit.General this transducer is made being commonly referred on the thicker substrate of slider, the polar cusp is terminated at be called the surface of air cushion surface (ABS).At United States Patent (USP) the 4th, 458, No. 279 and other list of references (its open part combination here is as a reference) middle description of wherein being quoted and the representative instance that this transducer has been described.
Generally, a pair of this thin film transducer is manufactured on the slider surface, each transducer is positioned at the two ends of slider surface with adjacent by the lug boss that track limited that extends on the whole length of this slider.Therefore, in a given assembly, this slider has a pair of track that is parallel to each other and extends along this slider length, and thin film transducer is associated with the lug boss of relevant track qualification.
The requirement of increase packing density causes quite little track width and has the demand of the transducer of corresponding less polar cusp on magnetic medium.Along with reducing of pole tip size, the signal amplitude of being exported by transducer winding correspondingly descends.This is not desirable, because reading in operating period, noise signal is more and more buried the data-signal that is produced by coil, the data retrieval that this leads to errors.Past, attempt by to the transducer winding increase more the multiturn number come this decline of compensate for signal amplitude.But this solution does not meet the requirements, because it causes transducer thickness to increase: particularly, in order to hold more multiturn number, with several layers of this coil of manufacturing, because the corresponding increase on noise, resistance and power consumption, the increase of this transducer thickness is undesirable.And, needing other procedure of processing, this increases and the reduction yield rate product cycling time, thereby makes unit cost higher.
The present invention comprises thin film transducer/transformer device and makes the method for this assembly, and the physical size that makes the transducer pole tip reduces greatly and do not sacrifice the reliability of electric signal that transducer produces.
The angle of slave unit, the present invention comprises: the substrate that area supported is provided, at the thin film magnetic transducer of stayed surface primary importance formation, at the film transformer of stayed surface second place formation, and the device that is used between transducer and transformer, providing electric coupling.This substrate support surface preferably is equipped with a pair of lug boss that laterally separates, and a contiguous lug boss forms transducer, and the position of transformer is adjacent with another lug boss.Electric coupling device preferably contains a pair of conductivity lead-in wire that extends between transducer and transformer.
Transducer comprises the conductivity coil with a pair of end, and transformer comprises the coil with a pair of end and the connection tap between these ends.Coupling device comprise be coupling in transducer winding terminal with a transformer coil end between first conductive path, and be coupling in another transducer winding end and be connected second conductive path between the tap with transformer coil.Output signal from transducer/transformer device obtains from the end of transformer coil.Transformer coil is used to increase the amplitude of the signal that transducer winding produces, and the value that amplitude increases depends on the two-part turn ratio of transformer coil.
Transformer comprises a bottom magnetic pole member, top pole member with bottom magnetic pole member formation closed magnetic circuit, this top and lower curtate pole pieces are by the magnetic-permeable material manufacturing, and be placed on conductive coil between the top and bottom pole pieces, this coil have a pair of end and should end between the connection tap, the bottom magnetic pole member preferably comprises first and second ends and extends therebetween mediator part; The top pole member preferably comprises first and second ends and extends therebetween and be placed on mediator part on the mediator part of bottom magnetic pole member, so that an inner space that holds coil to be provided, first and second ends of bottom magnetic pole member are coupled in first and second ends of top pole member respectively.The mediator part of top pole member preferably comprises the core that lets droop that extends to bottom magnetic pole member mediator part, transformer coil is preferably placed near the core of top pole member, if a transformer pole pieces is conducted electricity, connect tap and be electrically coupled to the conductivity pole pieces; On the other hand, connect tap and comprise that one has the independent tap element that the outside can reach the end.
Film magnetic pole transducer comprises: have the bottom magnetic pole member of back clearance end and magnetic pole, have the top pole member of back clearance end and magnetic pole, top and bottom magnetic pole member intercouple at its back clearance end, are spaced from each other at magnetic pole; The coil that between top and bottom magnetic pole member, has the multiturn process; And be used for device with this coil and pole pieces electrical isolation.
Viewpoint from method, the present invention comprises following steps: provide to have surface-supported substrate, form the thin film magnetic transducer in the stayed surface primary importance, form film transformer, and between transducer and transformer, form conduction and be connected in the stayed surface second place.Preferably construct the thin film magnetic transducer in the following way, promptly, formation one has the saturating magnetic bottom magnetic pole member of back clearance end and magnetic pole, on the bottom magnetic pole member, form a conductivity coil and around the back clearance end, and form one and have the back clearance end that is coupled in bottom magnetic pole member back clearance end and the top pole member of the magnetic pole that separates with the magnetic pole of bottom magnetic pole member.
Transformer is preferably made as follows, promptly, form the bottom magnetic pole member of a magnetic-permeable material, on the bottom magnetic pole member, form a loop construction in mode spaced apart from each other, and on loop construction, form the top pole member, the part of this top magnetic level member be coupled in the appropriate section of bottom magnetic pole member in case form have by loop construction around the closed magnetic path that divides of shank, the most handy following manner is made loop construction, promptly, on the bottom magnetic pole member, form first insulation course, on first insulation course, form first coil segment, on first coil segment, form second insulation course, on second insulation course, form second coil segment, and on second coil segment, form the 3rd insulation course.Have independent centre tapped embodiment and pass through before forming second coil, on second insulation course, to form the center tap element, and formation the 4th insulation course is made on the center tap element.During forming film transformer, the bottom magnetic pole member is exposed corresponding to the part that top pole member definite part to be formed is arranged, and by the formation of deposit magnetic-permeable material on loop construction top pole member, when forming, the top pole member comprises the appropriate section that exposes with the bottom magnetic pole member and contacts and extend in magnetic-permeable material between the loop construction upper bottom portion pole pieces expose portion.During making transformer, the contact pins that also provides a plurality of outsides of being coupled in loop construction in a predefined manner to reach.
Thin film transducer/transformer device can utilize the standard lithoprinting/deposition technique of institute's type of service in the thin film transducer process to make, and utilizes suitable mask to make the appropriate section of transducer and transformer similarly.And preferably utilize batch processing, and on same substrate, make several transducer/transformer devices like this, then be divided into independent assembly.Therefore, cost utilization that can be lower forms makes each assembly than the standardized technique of higher output.The transformer that comprises in the circuit between transducer and ensuing electronic circuit makes less transducer be used for read/write operation becomes possibility, and owing to transformer has increased signal amplitude and do not sacrificed signal to noise ratio (S/N ratio).
In order to understand character of the present invention and advantage more comprehensively, should be with reference to detailed description below in conjunction with accompanying drawing.
Fig. 1 is the isometric representation of being looked from the slider upside of describing new construction of the present invention;
Fig. 2 is the sectional view along the thin film transducer amplification of Fig. 1 line 2-2 interceptings;
Fig. 3 is the skeleton view of film transformer;
Fig. 4 is the stretch-out view of this transformer;
Fig. 5 is the sectional view along the amplification of line 5-5 interceptings of Fig. 3, and
Fig. 6 is the electrical schematic diagram that is coupled between expression transducer and the transformer.
Referring now to accompanying drawing,, Fig. 1 represents most preferred embodiment of the present invention.As shown in the drawing, on the area supported 11 of slider 12, form totally by the thin film magnetic transducer of label 10 expressions and the film transformer of representing totally by label 40.Slider 12 comprises the first and second air cushion rails 13,14, and they and slider 12 be whole to form and be provided for the air cushion surface of the slider 12 on the supporting movement disk (not shown) in a known way.
As shown in Figure 2, thin film transducer 10 comprises the ground floor magnetic membrane material that forms the first magnetic pole piece 15 on the surface 11 that is arranged on slider substrate 12.The first magnetic pole piece 15 is a uniform thickness between polar cusp 15a and back clearance district 15b at least.Be deposited on the pole piece 15 and such as the first non-magnetic insulating material floor 16 of silicon dioxide or aluminium oxide and extend to back clearance district 15b from polar cusp 15a.
The first electric conduction material layer that forms conductive coil winding 20a is deposited on the insulation material layer 16 with suitable pattern (such as rectangle, circle or ellipse).Second insulation material layer 22 that thickness is enough to cover winding 20a is deposited on the insulation course 16.The second electric conduction material layer that forms another conductive coil winding 20b is deposited on the insulation material layer 22 with suitable pattern.The 3rd insulation course 24 covers the second winding 20b.Thereby the first and second winding 20a are connected the two-layer coil that is connected that seals this zone 15b along back clearance district 15b formation loop to form with 20b.
Second magnetic material that forms second pole piece 26 be deposited upon first pole piece 15 among the back clearance district 15b, by the insulation course 22 in the occupied zone of conductive winding 20a and 20b and 24 and polar cusp 15a in insulation course 16 on.Pole piece 15 and 26 is separated by insulation course 16 in the polar cusp, so that form a transducing gap betwixt.The end of the end of the first winding 20a and the second winding 20b is electrically coupled to first end in the conductivity path 30,31 (Fig. 1) of separating, so that the coil of transducer 10 is connected to coil in the transformer 40, describes more comprehensively as following.
With reference to Fig. 3-5, transformer 40 comprises: bottom magnetic pole or magnetic stripe 60, upper magnetic pole or magnetic stripe 82 that its edge and central authorities and bottom strip 60 are joined, a pair of conductivity coil segment 66,68, one conductivity center tap elements 76 and electrical isolation partition 62,74,78 and 80.Lower coil section 66 is coupled in first contact pins 50; Center tap element 76 is coupled in second contact pins 52; Coil segment 68 is coupled in the 3rd contact pins 54.
As shown in Figure 5, top magnetic stripe 82 has the part 84 that the center lets droop, and passes the mesopore 70,72 of coil segment 66,68 and the mesopore 77 of center tap element 76, and total structure is a cylindrical shape.Central member 84 is terminated at the base section 85 that directly contacts with bottom magnetic stripe 60, to form closed magnetic path betwixt.In the described embodiment of Fig. 5, middle body 84 and coil segment 66,68 and center tap element 76 electrical isolations.As the skilled personnel can understand, if by the made of saturating magnetic but also conduction not only, then can removing center tap element 77, bottom strip 60 or top bar 82 provide tap by being electrically connected to fetch in foundation between the inner of coil segment 66,68 and bar 60,82 one or both of.On the other hand, can be from obtaining this tap to certain point of bar 60,82 one or both of along coil segment 66 or 68.
As shown in Figure 6, coil segment 20a, the 20b of thin film transducer 10 is electrically connected to the coil segment 66 of transformer 40 by lead 30,31, and the non-common port of output line along conducting path 31,33 from coil segment 66 and 68 that then connects the electronic circuit (not shown) obtains.For ease of being connected to external circuit, go out to have electrically contacting of amplification to distinguish 34,35 as shown.
As will be by understood by one of ordinary skill in the art, transformer 40 be used to revise the signal that is produced by transducer 10 on the conducting path 30,31 during the read operation.More specifically get on very well, raise by transformer 40 or increase from the voltage of signals level of transducer 10.The increase value of signal level is determined by the turn ratio of coil segment 66,68.For the described structure of Fig. 6, the numerical value of the number of turn N1 of signal input side is the number of turn in the coil segment 66 simply, and the numerical value of the number of turn N2 of signal outgoing side is the combined value of the number of turn in coil segment 66 and the coil segment 68.For any given practical application, these numerical value can be determined by empirical data.
As the skilled person will appreciate, above-mentioned formation transducer/transformer device be can be similar to and thin film transducer 10 and film transformer 40 made.In addition, utilize processing film step well known to those skilled in the art to realize the manufacturing of transducer 10 and transformer 40.Specifically, at first provide substrate 12, the suitable magnetic material by preliminary deposition such as ferronickel reaches the bottom magnetic pole 15 of specific thickness formation transducer 10 and the bottom magnetic pole 60 of transformer 40 then, then carries out selectable photomask pattern and forms and etching.Secondly, form first insulation course 16 and 62, then carry out the photomask pattern and form and etching by the insulation course that deposits such as silicon dioxide.On the other hand, on bottom magnetic pole 15,60 and substrate 12, apply photoresist layer, carry out the photomask pattern subsequently and form and hard roasting (curing).Next step, by making the first coil segment 20a and 66 such as the suitable conductive material of copper, silver, gold etc., by at first depositing the thickness that a film particles layer reaches about 200 dust orders of magnitude, then conductive material is deposited suitable thickness, making photomask pattern formation, soft roasting and coating, then is photoresistance band and stratum granulosum etching.Next form second insulation course 22,74, form the insulation course 78 (in institute's use occasion) of center tap lead-in wire 76 and transformer 40 subsequently, coil segment 20b, 68, insulation course 24,80 and top pole sheet 26,82.During the formation of insulation course 22, suitable aperture (not shown) is set, be electrically connected between the suitable end of coil segment, to form; Similarly, when forming coil segment 66,68 and center tap element 76, etching aperture 70,72 and 77 is to provide the central openings of holding top bar 82 central areas 84.In addition, in the insulation course 74,78 of transformer 40, form the aperture, so that the Ohmic contact between center tap element 76 and coil segment 66,68 inside end is provided.Form conductive path 30,31 and 33 and contact pins 34,35 after, one is deposited on the top of the transducer/transformer device of new formation such as the protective seam (not shown) of aluminium oxide.
Obviously, can utilize standard integrated circuit or thin film transducer in batch manufacturing technology make transducer/transformer device, form the scale of greatly saving thus, thereby can produce each assembly in high yield ground with suitable low cost.Comprising transformer 40 in this assembly makes and can use transducer 10 with less pole tip size and not victim signal amplitude and signal reliability.For example, for the transducer 10 of the coil segment 20b of coil segment 20a with 17 circles and 15 circles, its total number of turns is 32, is that 2: 1 transformer is to signal amplitude and make one 64 circle transducer winding and have same effect with turn ratio.
Though provide above most preferred embodiment complete sum of the present invention is described fully, those skilled in the art can expect various modification, replace structure and equivalent.For example, although the invention discloses transducer 10 on the slider left side lug boss 13 and the transformer 40 on the right lug boss 14, can imagine the just in time opposite assembly of transducer 10 and transformer 40 positions.Therefore, should not think that the above limits the present invention, the present invention is limited by appended claims.
Claims (12)
1. thin film transducer/transformer device, it contains:
The substrate that area supported (11) are provided,
A thin film magnetic transducer (10) that forms in the primary importance of described area supported,
A film transformer (40) that forms in the second place of described area supported, and
Be used to provide the device (40) of the electric coupling between described transducer (10) and the described transformer (40),
It is characterized in that: described supported surface (11) has a pair of lug boss that is spaced laterally apart, and one of described primary importance and described lug boss centering are adjacent, and another of the described second place and described lug boss centering is adjacent.
2. assembly as claimed in claim 1 is characterized in that: described electric coupling device contains a pair of conductive lead wire that extends between described transducer and the described transformer.
3. assembly as claimed in claim 1, it is characterized in that: described transducer comprises a conductive coil with a pair of end, described transformer comprises a coil with the connection tap between a pair of end and the described end, its feature also is: described coupling device comprises first conductive path between the end of end being coupling in described transducer winding and described transformer coil, and another described second conductive path that is connected between the tap terminal and described transformer coil that is coupling in described transducer winding.
4. assembly as claimed in claim 1, it is characterized in that: described transformer comprises the top pole member that a bottom magnetic pole member, and described bottom magnetic pole member form closed magnetic circuit, described top and bottom magnetic pole member are by the magnetic-permeable material manufacturing, one conductive coil is placed between the described top and bottom pole pieces, and described coil has the connection tap between a pair of end and the described end.
5. assembly as claimed in claim 4 is characterized in that: described pole pieces is coupling in relative two ends and central authorities thereof mutually.
6. assembly as claimed in claim 5 is characterized in that: the part that extends to central authorities' setting of another described pole pieces by means of a described pole pieces intercouples described pole pieces under centre.
7. assembly as claimed in claim 4, it is characterized in that: described bottom magnetic pole member has first and second ends and extends in therebetween mediator part, also be: described top pole member has first and second ends and extends therebetween and be placed on mediator part on the mediator part of described bottom magnetic pole member so that the inner space that holds described coil to be provided, and described first and second ends of described bottom magnetic pole member are coupled to first and second ends of described top pole member respectively.
8. assembly as claimed in claim 7 is characterized in that: the described mediator of described top pole member partly has the middle body that lets droop of the described mediator part that extends to described bottom magnetic pole member.
9. assembly as claimed in claim 8 is characterized in that: described coil configuration is near the described middle body of described top pole member.
10. assembly as claimed in claim 4 is characterized in that: at least one described pole pieces is conducted electricity, and also is: an end of described coil is electrically coupled to described conduction pole pieces.
11. assembly as claimed in claim 4 is characterized in that: described connection tap comprises that has the tap element that the outside can reach the end.
12. assembly as claimed in claim 1 is characterized in that: described thin film magnetic transducer comprises: the bottom magnetic pole member with back clearance end and magnetic pole.Top pole member with back clearance end and magnetic pole, described top and bottom magnetic pole member intercouple at its back clearance end, be spaced from each other at described magnetic pole, coil with a plurality of numbers of turn of process between described top and bottom pole pieces, and with the device of described coil and described pole pieces electrical isolation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105857 CN1032334C (en) | 1991-08-17 | 1991-08-17 | Thin film transducer/transformer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105857 CN1032334C (en) | 1991-08-17 | 1991-08-17 | Thin film transducer/transformer device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95103421 Division CN1124865A (en) | 1995-04-13 | 1995-04-13 | Thin film transformer assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1069820A CN1069820A (en) | 1993-03-10 |
| CN1032334C true CN1032334C (en) | 1996-07-17 |
Family
ID=33759873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91105857 Expired - Fee Related CN1032334C (en) | 1991-08-17 | 1991-08-17 | Thin film transducer/transformer device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1032334C (en) |
-
1991
- 1991-08-17 CN CN 91105857 patent/CN1032334C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1069820A (en) | 1993-03-10 |
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| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |