CA1294040C - Read/write head - Google Patents
Read/write headInfo
- Publication number
- CA1294040C CA1294040C CA000533999A CA533999A CA1294040C CA 1294040 C CA1294040 C CA 1294040C CA 000533999 A CA000533999 A CA 000533999A CA 533999 A CA533999 A CA 533999A CA 1294040 C CA1294040 C CA 1294040C
- Authority
- CA
- Canada
- Prior art keywords
- read
- head
- slot
- write head
- head body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
- Magnetic Heads (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A read/write head for use within a disk drive includes a vertical slot that extends longitudinally from a front surface of the head adjacent a side thereof. A horizontal slot extends from the front surface to the side of the head at an angle. A
ferrite core is disposed within the vertical slot and the core winding extends into the angled horizontal slot and is spaced from the head arm thereby eliminating electrical shorting.
A read/write head for use within a disk drive includes a vertical slot that extends longitudinally from a front surface of the head adjacent a side thereof. A horizontal slot extends from the front surface to the side of the head at an angle. A
ferrite core is disposed within the vertical slot and the core winding extends into the angled horizontal slot and is spaced from the head arm thereby eliminating electrical shorting.
Description
~ 6082-232 The present invention relates to read/write heads used within disk drives and, more particularly, to such heads with ferrite cores disposed adjacent one surface o~ the head.
In the use of highspeed disk drives, the read/write heads have been configured to have an aerodynamic shape such that the heads float or "fly7' above the surface of the spinning disks.
With the advance of disk drive technology it has been found that read/write heads with a ferrite core disposed adjacent one surface of the head are preferable in certain applications. One advantage of such head design is that by placing the core adjacent one surface, such as a vertical edge, more of the outer periphery of the disk can be used for data storage.
The read/write heads described above usually include a transverse slot extending across the entire width of the head body.
The transverse slot provides clearance for the core's winding adjacent the end of the head arm connected to the head body. It has been found that the winding can come into contact with the head arm and thereby cause an electrical short - resulting in an inoperative read/write head.
Another disadvantage of the read/write heads described above is that the read/write heads are configured to operate either above the top or the bottom of the disk surface, i.e. for each disk there needs to be two separate read/write head configurations because of the placement of the aerodynamically configured rails on one surface to permit the read/write head to "fly" above the surface of the spinning disk.
There exists a need for a read/write head that eliminates the problems of core winding shorting against the head arm.
Further, there is a need for a read/write head that can be utilized for both above and below disk applications. United States Patent No. 3,158,847 to Polkrabek, United States Patent No. 3,292,169 to D'Alessandro et al, United States Patent No. 4,506,307 to Watrous and United States Patent No. 4,514,776 to Koyama et al all dis-close various configurations o~ read/write heads for use with disk drives and the like. While such read/write heads accomplish certain of the same functions of the present invention, none of such read/write heads include an off-center vertical slot and an angled horizontal slot into which is inserted a transducer core.
Further, United States Patent No. 3,237,280 to Manders, Vnited States Patent No. 3,238,603 to Curtis et al and United Sta-tes Patent 4,402,025 to Anderson et al disclose read/write heads that include an angled slot that can retain a transducer core; however, none of these patents disclose an off-center vertical slot and an angled horizontal slot into which is inserted a transducer core.
These features are significant in overcoming the disadvantages of the prior art read/write heads.
SUMMARY OF THE INVENTION
The present invention has been developed to overcome -the foregoing disadvantages and meet the above described needs. Speci-fically, the present invention is a read/write head for use within a disk drive and includes a head body. A vertical slot extends longitudinally from a front surface into the body adjacent a side ~2g4~
~383~-9 surface thereof. A horizontal slot extends from the front surface to the side surface of the body. A core is disposed within the vertlcal slot and has its winding extending into the horizontal slot.
The head body of the present invention, instead of having a transverse horizontal slot, has an angled, preferably at 45 degrees from the vertical longitudinal axis of the body, slot which provides adequate space to encompass the winding and to space the windlng from the head arm. Thus, the shorting of the core winding has been eliminated.
Further, the head body of the present invention can be manufactured to have its top surface and bottom surface identical, including the aerodynamically configured rails. Thus, only a single read/write head ~ype needs to be used for either an above disk or a below disk application.
According to a broad aspect of the invention there is provided an improved read/write head for support on a read/write head arm support in a disk drive in which the read/write head is disposed above or below a horizontally rotating disk, the 0 read/write head comprising:
a head body substantially rectangular in con~iguration and having vertically extansive fron~ and side suriaces, the head body having a vertically extensive core slot disposed in near proximity to one selected side surface and extendiny longitudinally from the front surface of the head body, and the head body having a side winding slo~ extending from the selected side surface so that the ~.~
~2~
side winding slot intersects only the front surface of the head body and the core slot;
a core member supported by the core slot and extensive into the intersection of the core slot and the side winding slot, ~he core member having a winding bore disposed in the intersection of the core slot and the side wincling slot; and a winding supported by the core member extending through the winding bore and disposed substantially within the side winding slot.
The advantages and objects of the invention will become evident from the following detailed description of the drawings when read in connection with the accompanying drawinys which illustrate preferred embodiments of the invention.
BRIEF D~SCRIPTIO~ OF THE DRAWI~GS
Figure 1 is a bottom view of a prior art read~write head connected to a head arm.
Figure 2 is a plan view of a read~write head of one embodimenk of the present invention.
Figure 3A is a front elevational view of a read/write head of one embodiment of the present invention.
Figure 3B is a front elevational view of the read/write 3a ...; ~
, lZ~
head of Figure 2.
Figure 4 is a perspective view of a read/write head of the present invention including a core.
Figure 5 is a perspective view of a read/write head of the present invention including a core and its winding.
DETAILED DESCRIPTION OF THE DRAWINGS
The inventor hereof has developed a read/write head for use within a disk drive, comprising a head body having a vertical slot adjacent a side surface of the body and extending longitudin-ally from a front surface into the body. A horizontal slot extends from the front surface to the side surface of the body and a core is disposed within the vertical slot and has a winding extending into the horizontal slot.
As described earlier, prior art read/write heads have serious electrical shorting problems. For a better understanding of the novelty of the pre~ent invention, a brief description will be made of the prior art read/write heads. As shown in Figure 1, a read/write head 10 includes a head body 12 which is bonded or connected to a horizontally extending head support or arm 14.
An outer portion of the head arm 14 is usually in the form of a metallic support 16 from which the electrical connectors or wires 18 extend for connection to the read/write head body 12. A hori-zontal slot 20 extends transversely through the head body 12 and a vertical slot 22 extends from a front surface of the head body 12 adjacent a horizontal surface or edge thereof. Disposed within the vertical slot 22 is a planar ferrite core 24 which has an opening therein (not shown) around which is wrapped coils of wire qO
or a "winding" 26, that is connected to the wires 18. Manufactur-ing a read/write head 10 as shown in Figure 1 has proven to be more costly than desired, but more significantly the winding 26 is difficult to install and the winding often times touches the metallic support 16 which "shorts out" the read/write head 10.
For a better understanding of the present invention, reference is made to Figures 2, 3A and 3B, 4 and 5. Referring now to Figure 2 the read/write head of the present invention includes a head body 30 that can be of any suitable configuration or shape, including cylindrical, disk or square, but is preferably for the purpose of manufacturing rectangular. The head body 30 can be formed from any suitable material including plastic, graphite composite, ceramic or coated nonferous metal. The head body 30 includes a vertical slot 32 that extends longitudinally from a front surface 34 into the body 30 adjacent a vertical side 36 there-of. The vertical slot 32 can extend completely through an upper surface 38 and a lower surface 40 or through only such surface as desired.
One of the novel features of the present invention is a horizontal slot 42 that extends from the front surface 34 to the side 36. The slot 42 can extend through the upper surface 38 or the lower surface 40, as shown in Figure 3A, but it preferably is centered in the head body 30, as will be described later. The interior surface of the slot 42 can be of any desired shape but for ease of manufacturing and head balance, the interior surface of the slot 42 is vertical. Also, the interior surface of the .
.~29gL(~4~
slot 42 can, when viewed from above (Figure 2), be curved, notched or the like. Preferably, again for ease of manufacturing and head balance, the interior surface of the slot 42 defines a straight line. The angle with which the slot 42 intersects the surfaces 34 and 36 can be any angle desired, but for the purpose of the present discussion a 45 degree angle will be assumed.
A flux detector and creator of the type called a core 44 is disposed within the slot 32. The core 44 is generally planar in shape and is made from a ferrite material. The core 44 has an opening 46 extending transversely therethrough for accepting coils of wire called winding 48. The opening 46 can be of any desired shape but for ease of installing the wiring 48, at least one vertical edge is desired, preferably adjacent the front sur-face 34 to define a vertical edge member 50.
As can be seen in Figure 5, the winding 48 is vertically disposed rather than horizontally disposed as in the past; further, the winding 48 is spaced away from the metallic support arm 16 so no shorting problems can develop. Other advantages of the con-figuration of the read/write head of the present invention are as follows: the core is easier to wind thereby reducing associated manufacturing costs, the core is easier to install in the head body, the core is easier to glaze and insulate, the head body pro-vides an increased area or coil width for increased electrical performance, and the head body provides better balance and flying characteristics.
An alternate embodiment of the present invention, that 4~
eliminates the need for two separate head configurations for an above and a below dish application, is shown in Figure 3B where the upper surface 38 is identical to the lower surface 40. Both surfaces have the aerodynamic surfaces or "rails" 52 that create the aerodynamic forces necessary for the head to "fly" above the spinning disk. As shown in Figure 3B, the slot 32 extends through the upper surface 38 and the lower surface 40 so that the head body 30 can be balanced and symmetrical. Further, the horizontal dis-tance between the rails 52 should be great enough to permit con-nection or bonding with the metallic arm support 16 between therails 52. The advantages of the present invention are: 180 degrees symmetry for top or bottom head installation, thus there is no need for separate parts, no separate machining re~uired for top and bottom heads, improved balance of the head and arm because of the symmetry, and improved ceramic (sauriesan) application.
Changes may be made in the construction and arrangement of the parts or elements of the embodiments as described herein without departing from the spirit or scope of the invention defined in the following claims.
In the use of highspeed disk drives, the read/write heads have been configured to have an aerodynamic shape such that the heads float or "fly7' above the surface of the spinning disks.
With the advance of disk drive technology it has been found that read/write heads with a ferrite core disposed adjacent one surface of the head are preferable in certain applications. One advantage of such head design is that by placing the core adjacent one surface, such as a vertical edge, more of the outer periphery of the disk can be used for data storage.
The read/write heads described above usually include a transverse slot extending across the entire width of the head body.
The transverse slot provides clearance for the core's winding adjacent the end of the head arm connected to the head body. It has been found that the winding can come into contact with the head arm and thereby cause an electrical short - resulting in an inoperative read/write head.
Another disadvantage of the read/write heads described above is that the read/write heads are configured to operate either above the top or the bottom of the disk surface, i.e. for each disk there needs to be two separate read/write head configurations because of the placement of the aerodynamically configured rails on one surface to permit the read/write head to "fly" above the surface of the spinning disk.
There exists a need for a read/write head that eliminates the problems of core winding shorting against the head arm.
Further, there is a need for a read/write head that can be utilized for both above and below disk applications. United States Patent No. 3,158,847 to Polkrabek, United States Patent No. 3,292,169 to D'Alessandro et al, United States Patent No. 4,506,307 to Watrous and United States Patent No. 4,514,776 to Koyama et al all dis-close various configurations o~ read/write heads for use with disk drives and the like. While such read/write heads accomplish certain of the same functions of the present invention, none of such read/write heads include an off-center vertical slot and an angled horizontal slot into which is inserted a transducer core.
Further, United States Patent No. 3,237,280 to Manders, Vnited States Patent No. 3,238,603 to Curtis et al and United Sta-tes Patent 4,402,025 to Anderson et al disclose read/write heads that include an angled slot that can retain a transducer core; however, none of these patents disclose an off-center vertical slot and an angled horizontal slot into which is inserted a transducer core.
These features are significant in overcoming the disadvantages of the prior art read/write heads.
SUMMARY OF THE INVENTION
The present invention has been developed to overcome -the foregoing disadvantages and meet the above described needs. Speci-fically, the present invention is a read/write head for use within a disk drive and includes a head body. A vertical slot extends longitudinally from a front surface into the body adjacent a side ~2g4~
~383~-9 surface thereof. A horizontal slot extends from the front surface to the side surface of the body. A core is disposed within the vertlcal slot and has its winding extending into the horizontal slot.
The head body of the present invention, instead of having a transverse horizontal slot, has an angled, preferably at 45 degrees from the vertical longitudinal axis of the body, slot which provides adequate space to encompass the winding and to space the windlng from the head arm. Thus, the shorting of the core winding has been eliminated.
Further, the head body of the present invention can be manufactured to have its top surface and bottom surface identical, including the aerodynamically configured rails. Thus, only a single read/write head ~ype needs to be used for either an above disk or a below disk application.
According to a broad aspect of the invention there is provided an improved read/write head for support on a read/write head arm support in a disk drive in which the read/write head is disposed above or below a horizontally rotating disk, the 0 read/write head comprising:
a head body substantially rectangular in con~iguration and having vertically extansive fron~ and side suriaces, the head body having a vertically extensive core slot disposed in near proximity to one selected side surface and extendiny longitudinally from the front surface of the head body, and the head body having a side winding slo~ extending from the selected side surface so that the ~.~
~2~
side winding slot intersects only the front surface of the head body and the core slot;
a core member supported by the core slot and extensive into the intersection of the core slot and the side winding slot, ~he core member having a winding bore disposed in the intersection of the core slot and the side wincling slot; and a winding supported by the core member extending through the winding bore and disposed substantially within the side winding slot.
The advantages and objects of the invention will become evident from the following detailed description of the drawings when read in connection with the accompanying drawinys which illustrate preferred embodiments of the invention.
BRIEF D~SCRIPTIO~ OF THE DRAWI~GS
Figure 1 is a bottom view of a prior art read~write head connected to a head arm.
Figure 2 is a plan view of a read~write head of one embodimenk of the present invention.
Figure 3A is a front elevational view of a read/write head of one embodiment of the present invention.
Figure 3B is a front elevational view of the read/write 3a ...; ~
, lZ~
head of Figure 2.
Figure 4 is a perspective view of a read/write head of the present invention including a core.
Figure 5 is a perspective view of a read/write head of the present invention including a core and its winding.
DETAILED DESCRIPTION OF THE DRAWINGS
The inventor hereof has developed a read/write head for use within a disk drive, comprising a head body having a vertical slot adjacent a side surface of the body and extending longitudin-ally from a front surface into the body. A horizontal slot extends from the front surface to the side surface of the body and a core is disposed within the vertical slot and has a winding extending into the horizontal slot.
As described earlier, prior art read/write heads have serious electrical shorting problems. For a better understanding of the novelty of the pre~ent invention, a brief description will be made of the prior art read/write heads. As shown in Figure 1, a read/write head 10 includes a head body 12 which is bonded or connected to a horizontally extending head support or arm 14.
An outer portion of the head arm 14 is usually in the form of a metallic support 16 from which the electrical connectors or wires 18 extend for connection to the read/write head body 12. A hori-zontal slot 20 extends transversely through the head body 12 and a vertical slot 22 extends from a front surface of the head body 12 adjacent a horizontal surface or edge thereof. Disposed within the vertical slot 22 is a planar ferrite core 24 which has an opening therein (not shown) around which is wrapped coils of wire qO
or a "winding" 26, that is connected to the wires 18. Manufactur-ing a read/write head 10 as shown in Figure 1 has proven to be more costly than desired, but more significantly the winding 26 is difficult to install and the winding often times touches the metallic support 16 which "shorts out" the read/write head 10.
For a better understanding of the present invention, reference is made to Figures 2, 3A and 3B, 4 and 5. Referring now to Figure 2 the read/write head of the present invention includes a head body 30 that can be of any suitable configuration or shape, including cylindrical, disk or square, but is preferably for the purpose of manufacturing rectangular. The head body 30 can be formed from any suitable material including plastic, graphite composite, ceramic or coated nonferous metal. The head body 30 includes a vertical slot 32 that extends longitudinally from a front surface 34 into the body 30 adjacent a vertical side 36 there-of. The vertical slot 32 can extend completely through an upper surface 38 and a lower surface 40 or through only such surface as desired.
One of the novel features of the present invention is a horizontal slot 42 that extends from the front surface 34 to the side 36. The slot 42 can extend through the upper surface 38 or the lower surface 40, as shown in Figure 3A, but it preferably is centered in the head body 30, as will be described later. The interior surface of the slot 42 can be of any desired shape but for ease of manufacturing and head balance, the interior surface of the slot 42 is vertical. Also, the interior surface of the .
.~29gL(~4~
slot 42 can, when viewed from above (Figure 2), be curved, notched or the like. Preferably, again for ease of manufacturing and head balance, the interior surface of the slot 42 defines a straight line. The angle with which the slot 42 intersects the surfaces 34 and 36 can be any angle desired, but for the purpose of the present discussion a 45 degree angle will be assumed.
A flux detector and creator of the type called a core 44 is disposed within the slot 32. The core 44 is generally planar in shape and is made from a ferrite material. The core 44 has an opening 46 extending transversely therethrough for accepting coils of wire called winding 48. The opening 46 can be of any desired shape but for ease of installing the wiring 48, at least one vertical edge is desired, preferably adjacent the front sur-face 34 to define a vertical edge member 50.
As can be seen in Figure 5, the winding 48 is vertically disposed rather than horizontally disposed as in the past; further, the winding 48 is spaced away from the metallic support arm 16 so no shorting problems can develop. Other advantages of the con-figuration of the read/write head of the present invention are as follows: the core is easier to wind thereby reducing associated manufacturing costs, the core is easier to install in the head body, the core is easier to glaze and insulate, the head body pro-vides an increased area or coil width for increased electrical performance, and the head body provides better balance and flying characteristics.
An alternate embodiment of the present invention, that 4~
eliminates the need for two separate head configurations for an above and a below dish application, is shown in Figure 3B where the upper surface 38 is identical to the lower surface 40. Both surfaces have the aerodynamic surfaces or "rails" 52 that create the aerodynamic forces necessary for the head to "fly" above the spinning disk. As shown in Figure 3B, the slot 32 extends through the upper surface 38 and the lower surface 40 so that the head body 30 can be balanced and symmetrical. Further, the horizontal dis-tance between the rails 52 should be great enough to permit con-nection or bonding with the metallic arm support 16 between therails 52. The advantages of the present invention are: 180 degrees symmetry for top or bottom head installation, thus there is no need for separate parts, no separate machining re~uired for top and bottom heads, improved balance of the head and arm because of the symmetry, and improved ceramic (sauriesan) application.
Changes may be made in the construction and arrangement of the parts or elements of the embodiments as described herein without departing from the spirit or scope of the invention defined in the following claims.
Claims (8)
1. An improved read/write head for support on a read/write head arm support in a disk drive in which the read/write head is disposed above or below a horizontally rotating disk, the read/write head comprising;
a head body substantially rectangular in configuration and having vertically extensive front and side surfaces, the head body having a vertically extensive core slot disposed in near proximity to one selected side surface and extending longitudinally from the front surface of the head body, and the head body having a side winding slot extending from the selected side surface so that the side winding slot intersects only the front surface of the head body and the core slot;
a core member supported by the core slot and extensive into the intersection of the core slot and the side winding slot, the core member having a winding bore disposed in the intersection of the core slot and the side winding slot; and a winding supported by the core member extending through the winding bore and disposed substantially within the side winding slot.
a head body substantially rectangular in configuration and having vertically extensive front and side surfaces, the head body having a vertically extensive core slot disposed in near proximity to one selected side surface and extending longitudinally from the front surface of the head body, and the head body having a side winding slot extending from the selected side surface so that the side winding slot intersects only the front surface of the head body and the core slot;
a core member supported by the core slot and extensive into the intersection of the core slot and the side winding slot, the core member having a winding bore disposed in the intersection of the core slot and the side winding slot; and a winding supported by the core member extending through the winding bore and disposed substantially within the side winding slot.
2. The read/write head of claim 1 wherein the head body includes at least one longitudinally extending flying rail.
3. The read/write head of claim 1 wherein the head body is characterized as having upper and lower horizontal surfaces and wherein the configuration of the upper horizontal surface is identical to the configuration of the lower horizontal surface.
4. The read/write head of claim 2 wherein the head body is characterized as having at least one exterior horizontal surface which is adapted for connection to the read/write head arm support.
5. The read/write head of claim 1 wherein the head body is characterized as having upper and lower exterior horizontal surfaces, and the core slot extends vertically through the upper and lower exterior horizontal surfaces of the head body.
6. The read/write head of claim 1 wherein the side winding slot extends horizontally at an angle of approximately 45 degrees from the selected side surface of the body.
7. The read/write head of claim 1 wherein the side winding slot extends through at least one exterior horizontal surface of the body.
8. The read/write head of claim 3 wherein the side winding slot is disposed along the horizontal central axis of the head body so that the head body is symmetrical about its horizontal central axis.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US86808586A | 1986-05-29 | 1986-05-29 | |
| US868,085 | 1986-05-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1294040C true CA1294040C (en) | 1992-01-07 |
Family
ID=25351046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000533999A Expired - Fee Related CA1294040C (en) | 1986-05-29 | 1987-04-07 | Read/write head |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU7221287A (en) |
| CA (1) | CA1294040C (en) |
-
1987
- 1987-04-07 CA CA000533999A patent/CA1294040C/en not_active Expired - Fee Related
- 1987-04-29 AU AU72212/87A patent/AU7221287A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU7221287A (en) | 1987-12-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |