CN1062366C - Welding structure of electronic equipment part - Google Patents
Welding structure of electronic equipment part Download PDFInfo
- Publication number
- CN1062366C CN1062366C CN94107827A CN94107827A CN1062366C CN 1062366 C CN1062366 C CN 1062366C CN 94107827 A CN94107827 A CN 94107827A CN 94107827 A CN94107827 A CN 94107827A CN 1062366 C CN1062366 C CN 1062366C
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- pedestal
- small convex
- convex head
- plush copper
- radome
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
In a welding structure of electronic device element, a small projection 11 is formed on a base plate 10 and the surface of this small projection 11 is formed, for example, like a cylindrical surface. A curved part 3d of the surface of the bending portion 3c at the boundary of the bottom surface 3a and the side surface 3b of a shielding case 3 of a magnetic head 1 is abutted with the small projection 11. A current is impressed between the shielding case 3 and base plate 10 and the abutting part is caused to generate heat with an electric resistance for the purpose of welding.
Description
This invention relates to a kind of welded structure of electronic equipment part, and this element is by electronic equipment part being resisted against the electric resistance welding of finishing on the plush copper of conductive base, and this electronic equipment part is magnetic head for example, has a conductive shield.
In accompanying drawing 11, generally with 1 indication represented digitally represent that a magnetic head that is installed on the video tape recorder (VTR), this magnetic head are used to record, the motion of playback and control tape.Magnetic head 1 is fixed on the pedestal 2, is fixed on the component holder of video tape recorder by the mounting hole 2a on the pedestal 2 then.
Although magnetic head 1 and pedestal 2 interfix with screw usually, the method for using electric resistance welding now is to improve the number of operability and minimizing screw element.
In the technology of traditional electric resistance welding, the many small convex head 2b of machine-shaping on the surface of pedestal 2, the basal plane 3a of the surface of formation small convex head 2b and the radome 3 of magnetic head 1 faces mutually.These small convex heads 2b is formed by punch die in stamping procedure, has spherical surface on the whole.As shown in Figure 12, when the bottom surface 3a that is resisted against radome 3 as plush copper 2b went up, magnetic head 1 and pedestal 2 were clamped between electrode 4 and 5.Then, after magnetic head 1 and pedestal 2 were pressurized, electric current passed through between electrode 4 and 5.Between small convex head 2b and bottom surface 3a in the scope since electric current by because of resistance generates heat, thereby radome 3 and pedestal 2 local meltings and weld together.
Above-mentioned small convex head 2b is provided with for aggregate current between radome 3 and pedestal 2.Keep in balance for the conduction that makes the heat that produces because of resistance, plush copper 2b is machine-shaping on the element that keeps heat not too easily usually, for example, and machine-shaping on the thicker element in two elements that will be welded to each other together.
Yet traditional electric resistance welding structure exists following point.
(1) Figure 13 is the sectional drawing of the amplification of bearing part between pedestal 2 and the radome 3.Small convex head 2b machine-shaping on pedestal 2 with big thickness.Small convex head 2b is against the bottom surface 3a of radome 3, and the surface of radome 3 has been processed to the plane, therefore, the heat that produces against scope internal cause resistance between these two elements is tending towards being retained among the small convex head 2b, shown in the isotherm h among Figure 13 like that, wherein the heat among the bottom surface 3a of radome 3 is easily from wherein dissipating, and lost the thermal balance between two elements thus.The distributional difference that has caused isotherm h between two elements owing to heat conducting difference, correspondingly, small convex head 2b is more prone to molten state than radome 3, thereby has limited the scope of finishing the needed electric current of welding, and can not guarantee enough weld strengths.
Can improve by enlarging small convex head 2b, yet in this case, heat tends to dissipate from pedestal 2 about with regard to the problem of thermal balance with regard to mentioned above, therefore, welding current must strengthen to improve calorie value.Except the temperature that improves welding portion, also improved the temperature of radome 3 other parts like this, the heat of Chan Shenging has produced adverse effect to the magnetic core and the coil of inside therefrom, and has also caused the deterioration of tape slipping plane.Because above-mentioned discussion, from the viewpoint of reality, small convex head 2b can not enlarge.
Another aspect, when the thickness of pedestal 2 during less than the thickness of radome 3, small convex head should machine-shaping on the radome 3 with big thickness.Yet, because processing small convex head on radome 3 is the comparison difficulty, small convex head must be arranged on the pedestal 2, in this case, heat is more prone to dissipate at the welding portion of the radome 3 that does not have plush copper, thereby lost thermal balance, even limited the scope of finishing the needed electric current of welding.
(2) in above-mentioned traditional welded example, be resisted against on the bottom surface 3a of radome 3 at the small convex head 2b of machine-shaping on the pedestal 2 by handle, radome 3 is soldered with on the pedestal 2.Correspondingly, in Figure 13 by obtaining certain intensity on the represented tensile force direction of F1, still, weld strength on the shearing force direction represented by F2 then a little less than.
(3) since welding portion be clamped between the bottom surface 3a and pedestal 2 of radome 3, welded condition can not from visual observation to, can not the welding after confirm.
In order to solve above-mentioned traditional problem, the purpose of this invention just provides a kind of welded structure and production method thereof of magnetic head assembly, it can keep the good thermal balance of radome and pedestal, thereby enlarged the scope of finishing the required electric current of welding, and can obtain enough weld strengths, therefore easier affirmation welded condition.
In order to achieve the above object, this invention provides a kind of welded structure of magnetic head assembly, this device has a conductive magnetism head-shield and a conductive base, and conductive base is applied to support head housing, wherein on pedestal machine-shaping many small convex heads with against the lip-deep curvature portion of conductive magnetism head-shield bending part, this curvature portion and small convex head weld together by electric resistance welding.
In addition, be used for should being preferably curved surface against the surface of the small convex head of conductive magnetism head-shield curvature portion, preferred scheme can be the face of cylinder.
The present invention also proposes a kind of method of producing magnetic head assembly, this magnetic head assembly has a head housing and a pedestal, this pedestal is used to support described cover, it is characterized in that, this method comprises following operation: go out plush copper for described pedestal provides a hole and the machine-shaping on every side in described hole; Described plush copper is resisted against on the curvature portion on the bottom surface of described head housing; Electrode is contacted respectively on the bottom surface of the reverse side of described plush copper and described head housing; Energising between described electrode is so that plush copper heating and make the plush copper fusing, thereby described pedestal just welds together with the bottom surface of described head housing.
The moulding simultaneously of wherein said plush copper and described hole by punch press or the described pedestal of similar devices punching press.
In above-mentioned method, the lip-deep curvature portion of head housing bending part is resisted against on the small convex head of pedestal, thereby has finished electric resistance welding.The head housing bending part is compared with planar section, heat is difficult for therefrom dissipating, thereby keep head housing and have good thermal balance between the pedestal of plush copper easilier, thereby enlarged the scope of finishing the required electric current of welding, and can obtain enough weld strengths.Say that further the bending part of head housing is welded on the small convex head of pedestal, thereby improved the weld strength relevant on the base level direction with shearing force.
In addition, the surface of small convex head is a curved surface, and when the heat that produces because of resistance made its fusing, the surface of small convex head can not flatten, thereby has guaranteed the consistance of welding portion area and obtained stable weld strength.On the other hand, the surface of small convex head is columniform, has guaranteed the consistance of bearing part cross-sectional area, although the head housing bending part will change according to small convex head with respect to the rest position of small convex head.As a result, can both obtain consistent welded condition at all welding portions.
Below in conjunction with accompanying drawing embodiments of the invention are described further.Wherein,
Fig. 1 is the skeleton view according to the welded decomposition of the magnetic head of an embodiment of this invention and pedestal;
Fig. 2 is the sectional view of the amplification of middle welding portion embodiment illustrated in fig. 1;
Fig. 3 A is the skeleton view of the amplification of radome bending part and pedestal small convex head;
Fig. 3 B is the sectional view of solder joint point nuclear on each position of small convex head;
Fig. 4 A is the skeleton view according to the small convex head with cylindrical surface of the another one embodiment of this invention;
Fig. 4 B is the sectional view of solder joint point nuclear on each position of small convex head;
Fig. 5 A is the skeleton view with small convex head of spherical surface;
Fig. 5 B is the sectional view of solder joint point nuclear on each position of small convex head;
Fig. 6 A is the skeleton view of taper small convex head;
Fig. 6 B is the sectional view of solder joint point nuclear on each position of small convex head;
Fig. 7 A is the skeleton view of triangular pyramidal small convex head;
Fig. 8 is the skeleton view about an example of welding operation;
Fig. 9 is the sectional view of welding operation shown in Figure 8;
Figure 10 is that a width of cloth is represented the curve map that concerns between welding current and the weld strength, and this curve map is to obtain by the embodiment of this invention and a traditional welding configuration example.
Figure 11 is the skeleton view of the welded decomposition of traditional magnetic head and pedestal;
Figure 12 is the front elevation of traditional welding operation;
Figure 13 is the sectional view of the amplification of traditional welding portion.
An embodiment of this invention is described referring now to accompanying drawing.
Fig. 1 has partly represented the magnetic head same with the magnetic head shown in Figure 11 generally by digital 1.By magnetic core and the coil that is wrapped on the magnetic core are fixed in the radome 3 with resin, just obtained magnetic head 1.Magnetic head 1 comprises the tape slipping plane 1a that it is anterior, at a seam can seeing on this slipping plane on a part of magnetic core 1b and the magnetic core 1b.
The radome 3 of magnetic head 1 is made by the sheet metal of conduction, comprises the bending part 3c of a bottom surface 3a, horizontal side 3b and bottom surface and horizontal side intersection.The skeleton view of this bending part and sectional view are represented by Fig. 3 A and Fig. 2 respectively.Radome 3 bends a metal plate or draw by punching press and forms, and the surface of the bending part 3c that is got by plate bending has formed curvature portion 3d.Although it is the accurate face of cylinder that curvature portion 3d there is no need, for convenience's sake, be described as the face of cylinder with constant radius of curvature r, shown in Fig. 2 and Fig. 3 A, and the central axis of sweep is represented with 01 in Fig. 3 A.
Fig. 1 illustrates a pedestal 10 that supports magnetic head 1.Such pedestal 10 is made by conductive metal sheet, and has bigger thickness than screen cover 3.On the surface of pedestal 10, machine-shaping is everywhere arranged plush copper 11 with sweep 3d against radome 3.
Fig. 3 A is the partial enlarged drawing of small convex head 11.In the present embodiment, the abutment face 11a of small convex head 11 abuts against radome 3, and abutment face 11a is that radius is the part on the face of cylinder of the ideal cylinder of R, and this cylinder dots in Fig. 3 A.In Fig. 2 and Fig. 3 A, represent with H along the horizontal direction on the surface of pedestal 10, represent with V with respect to the vertical direction on pedestal 10 surfaces.The axis 02 of ideal cylinder is faced upward 45 ° in addition with respect to horizontal direction H, and in by the present embodiment shown in Fig. 2 and Fig. 3 A, the bearing of trend of the end face 11C of small convex head 11 is consistent with the vertical plane that extends with respect to the V direction on pedestal 10 surfaces.The curvature portion 3d of the bending part 3C of each radome 3 abuts against the top bus 11b of the abutment face 11a of each small convex head 11.Fig. 2 is the cross-sectional view of two member abuts states.
As shown in Figure 2, because the top bus 11b of abutment face 11a has faced upward 45 ° from the surface of pedestal 10, be placed vertically under the state on the pedestal 10 at magnetic head 1, the central point 0a of the curvature portion 3d of radome 3 is resisted against on the end face bus 11b.In this state, the center of surface axis of the axis 02 of the imaginary cylinder shown in Fig. 3 A and the curvature portion 3d of radome 3 is in 90 ° of angles, and curvature portion 3d puts mutually with top bus 11b and contacts.
Under state, welding current passes through between pedestal 10 and radome 3 shown in Figure 2, thereby because the effect of resistance, the some contact position between the top bus 11b of the curvature portion 3d of radome 3 and small convex head 11 has just produced heat.The heat that is produced tends to be retained among the bending part 3c of radome 3, and heat and traditional welded structure are compared and just be diffused in the radome 3 easily like this, as shown in figure 13, produce heat in the traditional welding structure on the 3a of bottom surface.Therefore, shown in the isotherm h among Fig. 2, the not tangible difference of the diffusion of heat between radome 3 and small convex head 11, thus be easy to the maintaining heat equilibrium.As mentioned above, as shown in Figure 2, between radome 3 and small convex head 11, formed similar isotherm, thereby guaranteed good thermal balance, avoided to be welded to each other the big difference of the molten state between two elements together thus, therefore, widened the scope of welding condition and guaranteed enough weld strengths.
Figure 10 shows the relation between electric current and the weld strength relevant with tensile force (F1), the radome 3 here and the small convex head 11 described in the foregoing description and what carried out with traditional small convex head 2b shown in Figure 11 to 13 is electric resistance welding.
In electric resistance welding, weld strength is directly proportional with the increasing of electric current, and ground is remarkable to be increased.Yet when electric current reached a particular value, weld strength but obviously descended because of electric current is excessive, shown in the dotted line among Figure 10.The excessive appearance of this electric current is owing to the interior hot of small convex head 2b or 11 increases too quickly so that fusing is excessive due to can not welding well.
As shown in figure 10, in traditional welded example, will cause that electric current excessive electric current 11 is lower, thereby limit the electric current I O that will obtain desirable strength and the scope between the super-high-current I1 widely by the β representative.On the other hand, in the foregoing description, will cause that electric current excessive electric current I 2 is bigger, thereby enlarge the electric current I 0 that will obtain desirable strength and the scope between the super-high-current I2 by α representative.It confirmed that the foregoing description can be widened welding condition in case with traditional welded example mutually specific energy electric current more easily is set and improves weld strength.
In addition, though the thickness of radome 3 less than the thickness of pedestal 10, heat is also dissipated by the bending part 3c from radome 3 fundamentally, thereby also can compare the scope of widening welding condition similarly with traditional welded structure and improve weld strength.
Say that further in the above-described embodiment, small convex head 11 and both sides fixed mask cover 3 are example to be provided with everywhere, under such state, finished welding, therefore, not only provide, also improved along the weld strength on the shearing force F2 direction along the weld strength on the tensile force F1 direction.In addition, welding portion can be observed from the side of radome 3, and correspondingly, the state of welding also can be confirmed by observation.
Shown in Fig. 4 A, the end face 11c of right cylinder formula small convex head 11 can be not orthogonal to the surface of pedestal 10, but can be perpendicular to the axis 02 of imaginary cylinder.In addition, small convex head 11 can be spherical, shown in Fig. 5 A, also can be taper, as shown in Figure 6A.Also have, it also can be the triangular taper, shown in Fig. 7 A.
The forming method of the small convex head 11 of the different shape shown in Fig. 3 A, 5A, 6A and 7A is as follows.The mould of the recess that the profile that has with every kind of small convex head 11 is complementary is placed on the front of pedestal 10, then, with drift or the analog reverse side from pedestal 10 it is pressurizeed, thereby makes the small convex head extrusion forming at an easy rate.Yet the tubular small convex head of extrusion forming is difficult, and shown in Fig. 4 A, this right cylinder is inserted to the surface of pedestal 10, and small convex head 11 can not be extracted out from the recess of mould after extrusion forming.In order to solve the above problems, shown in the dotted line F among Fig. 4 A, only be top bus 11b and radome 3 lean, this part makes the face of cylinder, and other parts are made to the surperficial external-expanding type of pedestal 10, thereby just can come extrusion forming small convex head 11 with above-mentioned mould.
Although can use the small convex head 11 of different shape, shown in Fig. 3 A to 7A, just use the small convex head 11 of shape shown in Fig. 5 A and 6A better, and adopt the small convex head shown in Fig. 3 A and the 4A than adopting the small convex head shown in Fig. 7 A for carrying out actual electric resistance welding even just better.
In the small convex head 11 of the pyramidal shape shown in Fig. 7 A, the part that leans with the curvature portion 3d of radome 3 is a rectangular edge.If when small convex head 11 cooled off after because of resistance heat again and hardens, welding portion was easy to change between top bus 11b and the radome 3.In other words, top bus 11b is very easy to flatten so that this welding portion of top portion bus 11b and radome 3 relies on small convex head 11 and changes in when fusing, so just is difficult to the weld strength that is maintained fixed.What leant by the small convex head 11 of sphere shown in Fig. 5 A and Fig. 6 A and taper and radome 3 respectively in contrast, is curved surface.Correspondingly, small convex head 11 time just is not easy to flatten in fusing, thereby relies on small convex head 11 and change with regard to having suppressed small convex head 11 and having shielded welding portion between 3, thereby has just guaranteed weld strength.
Say that further the small convex head with face of cylinder 11 shown in Fig. 3 A and 4A has better characteristic such as the small convex head shown in Fig. 5 A and the 6A.That is to say that small convex head 11 for example in the machine-shaping everywhere of pedestal 10, can be reasonably changes on the position of the intersection point of it and pedestal 10.In addition, be difficult to very accurately screen cover 3 is placed on the pedestal 10 so that the bottom surface 3a that makes radome 3 and pedestal 10 surperficial parallel, still, bottom surface 3a has the inclination with respect to pedestal 10 surfaces inevitably.In this case, the height of the curvature portion 3d of the radome 3 that leans with the top bus of small convex head can depend on small convex head 11 and change.
Fig. 3 A to Fig. 7 A shows the variation of rest position between curvature portion 3d and the small convex head 11, for example uses (a) and (b) and (c) represents.Fig. 3 B to Fig. 7 B further shows respectively at the (a) and (b) of Fig. 3 A to 7A and (c) xsect of the bearing part of locational small convex head 11.What Fig. 3 B to Fig. 7 B was represented is to use the state that cuts small convex head 11 with the axis 02 rectangular xsect of the imaginary cylinder shown in Fig. 3 A.
In the small convex head 11 by sphere shown in Fig. 5 A and the 6A and taper respectively, the variation of the height of the abutment face of counting from pedestal 10 is with (a) and (b) and (c) represent, thereby the bearing part (a) and (b) of small convex head 11 and area of section (c) (cross section of solder joint point nuclear) also correspondingly change.That is to say that small convex head 11 has also taken place against the position of the curvature portion 3d of radome 3 to change having changed the area of section of pad nuclear, thereby changed the state that thermal diffusion and electric current are assembled.Correspondingly, small convex head 11 also relies on small convex head 11 and changes against the welding condition of the curvature portion 3d of radome 3, thereby has caused relying on the difference of the intensity after small convex head 11 welding.In addition, the curvature portion 3d of radome 3 against or around the top of sphere or taper small convex head 11, therefore, the heat that has suppressed in the small convex head 11 dissipates, and reduced and caused the needed electric current of super-high-current, and super-high-current may cause can not welding condition.
The problems referred to above have also occurred in the small convex head of the triangular taper shown in Fig. 7 A.Shown in Fig. 7 B, small convex head 11 against the variation of the height of curvature portion 3d with (a) and (b) with represent that (c) variation has also correspondingly taken place the sectional area that solder joint point is examined.
In contrast, shown in Fig. 3 A and 4A, because small convex head 11 has the next curvature portion 3d against radome 3 in the face of cylinder, no matter be which position (a) and (b) and (c) against curvature portion 3d, the sectional area that small convex head 11 is examined at each locational solder joint point all is identical (referring to Fig. 3 B and 4B).Therefore, small convex head 11 can not influence the condition of welding against the difference of the position of curvature portion 3d, thereby has guaranteed weld strength.
The method of a kind of electric resistance welding of explanation can be welded on radome 3 on the pedestal 10 with above-mentioned Any shape small convex head 11 with this method now.
In the mode similar shown in Figure 12 to the traditional welding example of structure, when radome 3 that makes magnetic head 1 and pedestal 10 keep one regularly against state, electrode 4 and 5 from both sides up and down radome 3 and pedestal 10 are whole be clamped in the middle of.Then, energising is with the curvature portion 3d and the small convex head 11 of welding radome 3.
Also be fine as Fig. 8 and another kind of welding method shown in Figure 9.In this method, on four positions of pedestal 10, be provided with small convex head 11, be provided with a circular port 12 at the center position of each small convex head 11.Magnetic head 1 is inverted and firmly is clamped on the worktable (not shown) with anchor clamps.Then, small convex head 11 is installed in pedestal 10 on the bottom surface 3a of radome 3 down, and the top bus 11b of each small convex head 11 is resisted against on the curvature portion 3d of bending part 3c of radome 3.
Electrode 21 patchholes 12 and be resisted against on the bottom surface 3a of radome 3, another one electrode 22 preferably directly is resisted against the top of each small convex head 11, is resisted against on the reverse side (as the upper surface of Fig. 8 and Fig. 9) of pedestal 10.As a result, electric current passes through between electrode 21 and 22, and electric current flows to bending part 3c from the bottom surface 3a of radome 3, flows to small convex head 11 and pedestal 10 again, arrives electrode 22 at last.
In said method, because electric current does not flow in radome 3 except bottom surface 3a, thus not the generating heat on the whole of radome 3, thus avoided inner core and coil to be subjected to the influence of heat, and avoided because the variation of the tape slipping plane that causes of generating heat.
The welded structure of this invention is not only to be confined to magnetic head, but can be used for the weld job between the various parts, so long as have cover and a pedestal of a band bending part.
As mentioned above, according to first aspect of this invention, by carrying out electric resistance welding on the small convex head that the curved surface of the bending part of cover is resisted against pedestal.Thereby heat can not dissipate from the bending part of cover, so more easily keeps cover and has good thermal balance between the pedestal of small convex head, thereby widened and finished the scope of welding required electric current, and obtained enough weld strengths yet.In addition, the bending part of cover is welded on the small convex head of pedestal, thereby has increased the weld strength relevant with shearing force on the horizontal direction of pedestal.Also have, welding portion can be observed at an easy rate.
According to second aspect of this invention, the surface of small convex head is a curved surface, when small convex head is in molten state because of resistance generates heat, flattens with regard to the surface that has prevented small convex head, thereby has guaranteed the unanimity of bonding area.
According to the 3rd aspect of this invention, the surface of small convex head is the face of cylinder with the sectional area that guarantees small convex head in the bearing part unanimity, even the bending part of cover also is like this when changing with small convex head with respect to the rest position of small convex head.As a result, all obtain consistent welded condition at all welding portions.
Claims (5)
1, a kind of welded structure of magnetic head assembly, this device has a conductive magnetism head-shield and a conductive base, conductive base is used to support described head housing, it is characterized in that, on described pedestal machine-shaping many small convex heads with curvature portion against the bending part of described cover, described curvature portion and described plush copper are welded together by electric resistance welding method.
2, the welded structure of magnetic head assembly as claimed in claim 1, wherein the surface of the described plush copper that leans with the described curvature portion of described cover is a curved surface.
3, the welded structure of magnetic head assembly as claimed in claim 1, wherein the surface of the described plush copper that leans with the described curvature portion of described cover is the face of cylinder.
4, a kind of method of producing magnetic head assembly, this magnetic head assembly has a head housing and a pedestal, this pedestal is used to support described cover, it is characterized in that, this method comprises following operation: go out plush copper for described pedestal provides a hole and the machine-shaping on every side in described hole; Described plush copper is resisted against on the curvature portion on the bottom surface of described head housing; Electrode is contacted respectively on the bottom surface of the reverse side of described plush copper and described head housing; Energising between described electrode is so that plush copper heating and make the plush copper fusing, thereby described pedestal just welds together with the bottom surface of described head housing.
5, the method for production magnetic head assembly as claimed in claim 4, the moulding simultaneously of wherein said plush copper and described hole by punch press or the described pedestal of similar devices punching press.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP194094/93 | 1993-07-09 | ||
| JP194094/1993 | 1993-07-09 | ||
| JP5194094A JP2980490B2 (en) | 1993-07-09 | 1993-07-09 | Welding structure of electronic equipment parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1112705A CN1112705A (en) | 1995-11-29 |
| CN1062366C true CN1062366C (en) | 2001-02-21 |
Family
ID=16318853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94107827A Expired - Fee Related CN1062366C (en) | 1993-07-09 | 1994-07-08 | Welding structure of electronic equipment part |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2980490B2 (en) |
| CN (1) | CN1062366C (en) |
| MY (1) | MY111113A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55146626A (en) * | 1979-04-28 | 1980-11-15 | Canon Inc | Manufacture of magnetic head case |
| JPH04158985A (en) * | 1990-10-19 | 1992-06-02 | Ndc Co Ltd | Resistance welding method for porous metallic members |
-
1993
- 1993-07-09 JP JP5194094A patent/JP2980490B2/en not_active Expired - Fee Related
-
1994
- 1994-07-07 MY MYPI94001767A patent/MY111113A/en unknown
- 1994-07-08 CN CN94107827A patent/CN1062366C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55146626A (en) * | 1979-04-28 | 1980-11-15 | Canon Inc | Manufacture of magnetic head case |
| JPH04158985A (en) * | 1990-10-19 | 1992-06-02 | Ndc Co Ltd | Resistance welding method for porous metallic members |
Also Published As
| Publication number | Publication date |
|---|---|
| MY111113A (en) | 1999-08-30 |
| CN1112705A (en) | 1995-11-29 |
| JPH0729111A (en) | 1995-01-31 |
| JP2980490B2 (en) | 1999-11-22 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20010221 |