CN1217530A - Magnetic head - Google Patents
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- CN1217530A CN1217530A CN 98123600 CN98123600A CN1217530A CN 1217530 A CN1217530 A CN 1217530A CN 98123600 CN98123600 CN 98123600 CN 98123600 A CN98123600 A CN 98123600A CN 1217530 A CN1217530 A CN 1217530A
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Abstract
To improve a positioning accuracy of, especially, a core relating to a magnetic head inserted by a core assembly held by a holder in a shield case and also to make the magnetic head correspond to reducing the thickness. SOLUTION: A core assembly is inserted in a holder 13 made of PBT resin, and the core assembly is held between a positioning part 25a and a pressurizing part 25b formed in the holder 13 in one body. Therefore, a holding pressure and a positioning force can be applied even to a thin type core assembly. Moreover, since one half core body 12a of the core assembly is pressurized on the positioning part, a breaking force does not act between the half core bodies 12a, 12b.
Description
The present invention relates to remain on the fit magnetic head that inserts in the radome of magnetic core set on the support, particularly relate to when improving the bearing accuracy of magnetic core etc. a kind of magnetic head that can correspondingly do very thinly.
Fig. 6 is the side view of expression existing magnetic head H1.
This magnetic head H1 remains on magnetic core set zoarium 2 in the radome 1.In this magnetic core set zoarium 2, half of magnetic core 2a and half of magnetic core 2b engage one another, and the nonmagnetic substance of packing between the apparent surface in gap forms magnetic gap G1.In addition, twist in the outside that coil 3 on the coil rack is inserted in magnetic core set zoarium 2.
In existing this magnetic head, there is following problem in the location about magnetic core etc.
(1), utilize leaf spring etc. to push half of magnetic core 2a and half of magnetic core 2b towards f1a and f1b direction in order to make magnetic core set zoarium 2 in the Width (direction vertical) of magnetic track location with paper.Form the locating surface relative with the f1b direction with aforementioned f1a direction on the supports in radome 1 etc., half of magnetic core 2a and half of magnetic core 2b are urged respectively on aforementioned locating surface and locate.
But, because the apparent surface in the gap of half of magnetic core 2a and half of magnetic core 2b is not more as the situation that benchmark forms with the side of half of magnetic core, therefore, when magnetic core set zoarium 2 with the side is the benchmark location, exist the azimuthal shortcoming that correctly to set magnetic gap G1.In addition, the side of the side of half of magnetic core 2a and half of magnetic core 2b may not be formed on same, and the flatness of the locating surface of support differs and reliably guaranteed surely.Because like this,, cause disadvantages such as gap length increase on f1a and f1b direction on half of magnetic core 2a and half of magnetic core 2b when half of magnetic core 2a and half of magnetic core 2b during single compressing, have the power of bending to interact respectively.
(2), the end face of half of magnetic core 2a is pressed on the locating surface pushing of magnetic core set zoarium 2 towards f2 directions at the gap length direction location of magnetic core set zoarium 2 sun.But shown in the sectional view of Fig. 5 (C), the monomer magnetic core is a plurality of overlapping lamination structures, and in most of the cases, some monomer magnetic cores can highlight in the side of half of magnetic core 2a, and therefore, the side of half of magnetic core 2a can not be on same plane.In this case, shown in Fig. 5 (C), when being pressed in the magnetic core set zoarium on the locating surface, on the magnetic core set zoarium, being easy to generate and putting upside down power α, the position angle of magnetic gap changes easily.
(3) in magnetic head H1, must when positioning, apply the clamping force f3 that compresses mutually also must for half of magnetic core 2a and half of magnetic core 2b with magnetic core set zoarium 2 to the pushing of f2 direction, in magnetic gap G1, the gap apparent surface of half of magnetic core is pressurizeed each other.
Here, as shown in Figure 6, in the big magnetic head of longitudinal size,, therefore, aforementioned detent force f2 can be acted on the part of short transverse of half of magnetic core end face, and aforementioned clamped power f3 is acted on another part because the end face of half of magnetic core 2a and 2b is also long.But for example in the magnetic head of the longitudinal size little (thin type) that uses on camera etc., the longitudinal size of half of magnetic core is also short, therefore, on half of magnetic core, should guarantee to apply power f2, and guaranteeing to apply power f3 again is the comparison difficulty.In addition, promptly enable to apply power f2 and power f3, but their pressurization areas separately are narrow and small, therefore, are difficult to obtain reliable snap-in force.
(4) in existing magnetic head H1, radome 1 is located reliably with respect to the reference for installation of tape phonograph or camera etc., the relative position of radome 1 and magnetic core set zoarium 2 moves, and becomes asymmetricly, and this has harmful effect to magnetic recording and reproducing characteristics.
The objective of the invention is to solve above-mentioned prior art problems, a kind of magnetic head that can make the magnetic core set zoarium at track width direction and gap length direction hi-Fix is provided.
Another object of the present invention is will provide a kind of can apply the magnetic head of detent force and clamping force reliably in the short half of magnetic core of longitudinal size.
In addition, a further object of the invention is to provide a kind of radome and half of magnetic core of making correctly to locate with respect to the reference for installation of apparatus main body, and, can improve the magnetic head of bearing accuracy of the relative position of radome and half of magnetic core.
Magnetic head of the present invention has, and by nonmagnetic substance, a pair of half of magnetic core is engaged, and forms the magnetic core set zoarium of magnetic gap; Keep the support of this magnetic assembly and the radome of this magnetic core set zoarium of cover and support.Wherein, be provided with a location division that end face contacts in two end faces with the gap length direction of aforementioned magnetic core set zoarium, with the compressed part that the other end is pressed on the aforementioned location division, have at least one to be in aforementioned location division and the compressed part towards the outstanding curve form of the direction of aforementioned magnetic core set zoarium.
When in location division and the compressed part one or two made curve form, even the magnetic core end face at the overlapping lamination structure of a plurality of monomer magnetic cores is uneven, not under the situation of flat surfaces, also can utilize compressed part reliably to compress, can not apply big tilting force, and can be arranged on the location division, can not be subjected to big tilting force effect the magnetic core set zoarium, therefore, the location of the gap length direction of magnetic core set zoarium can reach very high precision.
In this case, the two is curve form aforementioned location division and compressed part, and the radius-of-curvature that the radius-of-curvature of the curve form of aforementioned location division cans be compared to most aforementioned compressed part more greatly.
When reducing the radius-of-curvature of compressed part, snap-in force is concentrated on any of the fit end face of magnetic core set.Like this, even the magnetic core end face of lamination structure is uneven, also can with locate reliably snap-in force act on the magnetic core set zoarium Width in the heart.In addition, when increasing the radius-of-curvature of location division, the outshot that the end face of half of magnetic core is uneven with respect to the location division, in plural local contact, therefore, can improve the bearing accuracy of the gap length direction of magnetic core set zoarium easily.
In this case, preferably make the summit of curve form be positioned at the center of the track width direction of magnetic core set zoarium.
Magnetic head of the present invention has, and by nonmagnetic substance, a pair of half of magnetic core is engaged, and forms the magnetic core set zoarium of magnetic gap; Keep the support of this magnetic core set zoarium and the radome of this magnetic core set zoarium of cover and support.Wherein, when with the outside surface vertical with the gap apparent surface of aforementioned magnetic core set zoarium as the side sun, be provided with the location division, side of the contacts side surfaces of at least one half of magnetic core and only an aforementioned half of magnetic core be pressed on compressed part on the location division, aforementioned side.
Like this, when only being pressed on a half of magnetic core in the magnetic core set zoarium on the location division, side, be difficult to the effect of bending power each other, therefore, can not produced problems such as gap length increase at half of magnetic core.
In addition, when with the outside surface of the both sides of the gap length direction of magnetic core set zoarium during as end face, the compressed part that the end face location division that contacts with the end face of an aforementioned half of magnetic core can be set and another end face of magnetic core set zoarium is compressed towards aforementioned end face location division direction.
Promptly, when with the side of a half of magnetic core in the magnetic core set zoarium and end face as positioning reference, by making another half of magnetic core have higher degree of freedom, and do not produce bending power each other, can improve the fit whole bearing accuracy of magnetic core set simultaneously at half of magnetic core.In this case, when the end face location division of the end face location that makes a half of magnetic core is foregoing curve form, be benchmark with the side easily, make half of magnetic core location.In addition, end face location division in this case also can be the outshot beyond the aforementioned curve form.
In addition, an aforementioned half of magnetic core of magnetic core set zoarium, preferably with the side that contacts with location division, aforementioned side as reference field, the apparent surface in gap is ground.
In this case, by determining the degree of tilt of the location division, side in support accurately, can reduce the azimuth angle error of magnetic gap.
In this case, volume has the coil rack of coil to be inserted in the magnetic core set zoarium with connecting, and the part of this coil rack is compressed by aforementioned compressed part, utilizes this snap-in force, also an aforementioned half of magnetic core can be pressed on the location division, side.
But the two is preferably in aforementioned any location division and compressed part and forms one in the support.At this moment compressed part is that the rib or the jut that are made of one with support grade.
Magnetic head of the present invention has, and by nonmagnetic substance, a pair of half of magnetic core is engaged, and forms the magnetic core set zoarium of magnetic gap; Keep the support of this magnetic core set zoarium and the radome of this magnetic core set zoarium of cover and support.Wherein, in aforementioned brackets, be provided with respectively inside surface opposite external side face with aforementioned radome, on a lateral surface, be compressed part that compresses the radome inside surface of the whole formation of standing shape, and on another lateral surface, form the location division that contacts with another inside surface of the radome that utilizes aforementioned compressed part to compress.
Because in the present invention, radome is pressed on the location division of a lateral surface of support, therefore, can highly precisely determine the relative position of radome and support, and the relative position of radome and magnetic core set zoarium.In addition, owing on support, integrally formed the compressed part of standing shape, therefore, no longer need other spring part etc.Like this, number of parts can reduce, and can make the magnetic head miniaturization.
Magnetic head of the present invention has, and by nonmagnetic substance, a pair of half of magnetic core is engaged, and forms the magnetic core set zoarium of magnetic gap; Keep the support of this magnetic core set zoarium and the radome of this magnetic core set zoarium of cover and support.Wherein, aforementioned brackets is in radome, makes magnetic core retaining part that keeps the magnetic core set zoarium and the integrally formed structure in mounting portion of giving prominence to the outside of radome, and radome is then clamped to remain between aforementioned magnetic core retaining part and the mounting portion.
This structure can make the center of radome and the centralized positioning of support reliably.In this case, be preferably on the aforementioned mounting portion, make the location division that contacts with the outside surface of aforementioned radome, and on the magnetic core retaining part, make the compressed part that the inside surface of radome is compressed towards the direction of aforementioned location division.
In magnetic core remains on the magnetic core retaining part of aforementioned brackets, when this confining force is added in bulging force or bending force on the magnetic core retaining part, this radome is pressed on the mounting portion that is not subjected to this bulging force or bending force effect and locatees, therefore, in the confining force that strengthens radome, can be benchmark highly precisely, make the radome location with the mounting portion.
In addition, mutually perpendicular two sides of aforementioned mounting portion preferably are exactly datum clamp face, and, be preferably on the bottom surface of support, integrally form at least three support outshots as reference for installation.
Adopt this structure, can make radome and half of magnetic core is benchmark with the support, location correctly, and can improve bearing accuracy with respect to each member of magnetic head reference for installation.
In the above description, support is preferably by PBT (polybutadiene terephthalate), PET (polyethylene terephthalate), PA (polyamide), PC (polycarbonate), POM (polyacetal), PPE (polyphenylene oxide), PPS (polyphenylene sulfide), PAR (poly-arylide), PMP (polymethylpentene), any engineering plastics in the polyfurolresin are made, and particularly the most handy PBT (polybutadiene terephthalate) resin is made.
The fragility of PBT in the above-mentioned engineering plastics is good, yet because difficult cutting, when little outshot or rib are set on support, during as compressed part, this outshot or rib can not pruned or be damaged, and always can produce only snap-in force.
Fig. 1 (A) expression is from the planimetric map of the magnetic head of the present invention seen with the recording medium facing surfaces; Fig. 1 (B) expression is from the side view of the magnetic head of the present invention seen with the recording medium facing surfaces; Fig. 1 (C) is the longitudinal section of Fig. 1 (A);
Fig. 2 (A) is the planimetric map of support; Fig. 2 (B) is the longitudinal section of support;
Fig. 3 (A) remains on the planimetric map of the state on the support for expression magnetic core set zoarium; Fig. 3 (B) is the sectional view along the B-B line of Fig. 3 (A);
Fig. 4 (A) is the part enlarged drawing of Fig. 3 (A); The key diagram of the positioning function of the track width direction of Fig. 4 (B) expression magnetic core set zoarium;
Fig. 5 (A), Fig. 5 (B) is the key diagram of the positioning function of the gap length direction of explanation magnetic core set zoarium; Fig. 5 (C) is the key diagram of comparative example;
Fig. 6 is the side view of existing magnetic head.
As Fig. 1 (A), Fig. 1 (B), shown in each figure of Fig. 1 (C), magnetic head H has the back side cover 15 at the back side of the coil rack 14 of coil 14a and cover and shield bracket 13 to constitute by radome 11, magnetic core set zoarium 12, support 13, volume.This magnetic head H is very thin, can be installed in the camera as APS mode etc.
Radome 11 and back side cover 15 is made by the magnetic material of high permeabilities such as permalloy, and constitutes the half of magnetic core 12a of magnetic core set zoarium 12, the stacked core that 12b gathers into folds for the thin plate layer with magnetic materials such as ferrite or permalloys.
As Fig. 2 (A), shown in Fig. 2 (B), support 13 is by the magnetic core retaining part 13a of radome 11 covers with in the outside of radome 11, to X1 direction and the outstanding mounting portion 13b of X2 direction, the whole formation of 13b.At magnetic core retaining part 13a and mounting portion 13b, between the 13b, form the maintenance groove 13c that keeps this radome 11,13c from the top; And, on the 13b, form the maintenance groove 13d that keeps this back side cover 15,13d from the below at mounting portion 13b.
As the solid line among Fig. 1 (A), shown in the dotted line among Fig. 2 (A), but radome 11 is mounted to the magnetic core retaining part 13a of cover support 13, and in addition, aforementioned maintenance groove 13c is inserted in the bottom of radome 11, in the 13c, and clamped the maintenance.
As Fig. 2 (A), shown in Fig. 2 (B), the lateral surface 16a of the Y1 side of the magnetic core retaining part 13a of support 13 is the location division, on the lateral surface 16b of the Y2 side relative with it, integrally makes the compressed part 17,17 of rib shape.In Fig. 3 (B), aforesaid lateral surface 16a, 16b and compressed part 17 show as the cross section.
Under the state that radome 11 has been installed, the inside surface 11a of radome 11 relies on by aforementioned compressed part 17,17 the power F1 that produce towards the Y2 direction, be pressed on the magnetic core retaining part 13a of support 13, and the inside surface 11b of an opposite side of radome 11 is subjected to aforementioned compressed part 17,17 elastic compression power is crushed on the aforementioned lateral surface 16a as the location division.Therefore, radome 11 is in the position of Y direction, and lateral surface 16a that can the Y1 side determines as the location division.Owing to be positioned at the Y1 side identical with the datum clamp face 13e of support 13 as the aforementioned lateral surface 16a of location division, so, can rely on the forming accuracy of support 13, highly precisely determine the relative position of datum clamp face 13e and lateral surface 16a.Therefore, radome 11 can be with respect to the datum clamp face 13e of support 13, in Y1 direction location and installation accurately.
In addition, utilize at the magnetic core retaining part 13a of support 13 and the maintenance groove 13c between the 13b of mounting portion, 13c can integrally form the compressed part 18b of rib shape in two places (four places altogether) of each side of magnetic core retaining part 13a.In addition, mounting portion 13b, the inside surface of 13b constitutes location division 18a.When bottom with radome 11, insert maintenance groove 13c towards the Z1 direction, in the time of in the 13c, shown in Fig. 1 (C), radome 11 is compressed by the sensing X1 direction that is produced by each compressed part 18b and the power F2 of X2 direction at the inside surface 11c of directions X.This snap-in force F2 also can be with the outside surface 11d of radome 11, and 11d is pressed on mounting portion 13b respectively, and the location division 18a of 13b is on the 18a.
Owing to support 13 high resiliences of making by the PBT resin, as described later, when magnetic core set fit 12 is inserted, and when remaining in the magnetic core retaining part 13a of support 13, it keeps reacting force that magnetic core retaining part 13a is enlarged to X1 direction and X2 direction, magnetic core retaining part 13a is crooked easily, Z2 one side projection.This deformation force acts on the inside surface 11c of radome 11 by aforementioned compressed part 18b, on the 11c, and the outside surface 11d of radome 11,11d is pressed in location division 18a, on the 18a.
Since form aforementioned localization part 18a, the mounting portion 13b of 18a, 13b and magnetic core retaining part 13a are independent, and therefore, the influence of suffered aforementioned bending force is very little.Therefore, the X1 direction of radome 11 and the outside surface 11d of X2 direction, 11d can be by being formed at mounting portion 13b, the location division 18a on the 13b, 18a location.In addition, because aforementioned bending force approximate equality ground acts on X1 direction and X2 direction, therefore, radome 11 is the central point O shown in Fig. 2 (A) relatively, locatees equably on X1 direction and X2 direction.Like this, the center of radome 11 is consistent easily with the center of support 13.
By the above as can be known, radome 11 can support 13 be a benchmark, and in Y2 direction location, and the center can very accurately be determined.
In addition, at the mounting portion of support 13 13b, the maintenance groove 13d of the last formation of 13b among the 13d, as compressed part, forms the rib 13h towards outer direction respectively, 13h.Shown in Fig. 1 (C), when being inserted, back side cover 15 towards Z2 directions keep groove 13d, and in the time of in the 13d, this back side cover 15 is by rib 13h, and 13h compresses to remain on and keeps groove 13d, in the 13d.
Secondly, remain on the magnetic core set zoarium 12 among the magnetic core retaining part 13a of aforementioned brackets 13, constitute by half of magnetic core 12a and half of magnetic core 12b.
Shown in Fig. 1 (A), constitute the half of magnetic core 12a and the half of magnetic core 12b of magnetic core set zoarium 12, by going up monomer magnetic core that overlapping four ferrites or permalloy etc. make in track width direction (Y direction) 1., 2., 3., 4. constitute respectively.
Shown in Fig. 1 (C), the half of magnetic core 12a and the same half of magnetic core 12b that is made of four monomer magnetic cores that are made of four monomer magnetic cores are bonded with each other, apparent surface's one side (Z2 side) in recording medium, half of magnetic core 12a and half of magnetic core 12b engage by layer of non-magnetic material, form magnetic gap Ga.In addition, half of magnetic core 12a and half of magnetic core 12b engage in Z1 one example, form back clearance Gb.In this back clearance part, volume has the coil rack 14 of coil 14a to insert from the outside in the magnetic core set zoarium 12.
As Fig. 2 (A), shown in Fig. 2 (B), be provided with magnetic core holding chamber 21 in the inside of the magnetic core retaining part 13a of support 13, and on the part relative, offer the magnetic core window 22 that is communicated with aforementioned magnetic core holding chamber 21 with recording medium.When inserting magnetic core set zoarium 12 towards Z2 directions in the magnetic core holding chamber 21, the magnetic gap Ga of magnetic core set zoarium 12 exposes from magnetic core window 22.Shown in Fig. 1 (A) and Fig. 1 (C), this magnetic gap Ga exposes towards the Z2 direction from the window 11e in the slipping plane upper shed of radome 11.Like this, the surface and the magnetic core set zoarium 12 of Z2 one side of radome 11 ground jointly, form the slipping plane of magnetic core set fit 12 and recording medium.
On the internal edge of the Y1 of magnetic core holding chamber 21 direction, form the location division 23a and the 23b of side.The half of magnetic core 12a of magnetic core set zoarium 12 contacts with location division 23a, and half of magnetic core 12b contacts with location division 23b, but in this embodiment, mainly is that location division 23a is to the be positioned with help of magnetic core set zoarium 12 in the Y1 direction.
Shown in Fig. 3 (A), on the X1 end of coil rack 14, integrally form to the outstanding pressing projection part 14b of Y2 direction.Shown in Fig. 3 (B), near the position of the recording medium opposite side (Z2 side) of coil rack 14, form pressing projection part 14b.The inside surface 21a of Y2 one side of the magnetic core holding chamber 21 of support 13 becomes compressed part, is located at pressing projection part 14b on the aforementioned coil rack 14 and is pressed on the inner surface 21a as compressed part.Coil rack 14 is by its reacting force, i.e. Fig. 3 (A), and the snap-in force F3 shown in Fig. 3 (B) compresses, the result, magnetic core set zoarium 12 is pressed towards the Y1 direction.
But, shown in Fig. 3 (A), because pressing projection part 14b only forms on the end of the X1 of coil rack 14 side, aforementioned snap-in force F3 is on the position of being partial to the X1 side, act on the magnetic core set zoarium 12, therefore, have only the half of magnetic core 12a of X1 one side to be pressed on the 23a of location division.Like this, among location division, the side 23a and 23b that on support 13, forms,, can make magnetic core set zoarium 12, and for the location division 23b of X2 one side, magnetic core set zoarium 12 have bigger degree of freedom in Y1 direction location by being positioned at the location division 23a of X1 side.
In addition, Fig. 3 (A), Fig. 3 (B) be as opposite configuration, and the pressing projection part integrally forms on the inside surface 21a of the magnetic core holding chamber 21 of support 13, utilize this pressing projection part, the end that compresses the X1 side of coil rack 14 towards the Y1 direction also is fine.Perhaps, pressing projection partly is integrally formed on the part and support 13 relative with the aforementioned location division 23a of X1 one side, utilizes this pressing projection part, be pressed on the 23a of location division the half of magnetic core 12a of magnetic core set zoarium 12 also passable.
Because location division 23a is formed on a side identical with the datum clamp face 13e of support 13, and near each other, therefore, can datum clamp face 13e as benchmark, determine the position of the magnetic gap Ga of magnetic core set zoarium 12 accurately in the track width direction.
Shown in Fig. 2 (A),, integrally form the location division 25a and the compressed part 25b of end face respectively on the inside surface of X1 one side of the magnetic core holding chamber 21 of support 13 and on the inside surface of X2 side.The location division 25a of end face and compressed part 25b respectively towards the direction of magnetic core set zoarium 12, are curve form and highlight.In addition, the surface of location division 25a and compressed part 25b is roughly the curve form of circular arc, and the summit of curved surface is positioned on the center (by the line of center O shown in Figure 2) of the track width direction of magnetic core set zoarium 12.The radius-of-curvature of the curve form of location division 25a is bigger than the radius-of-curvature of the curve form of compressed part 25b.
Shown in Fig. 1 (C) and Fig. 3 (A), when inserting magnetic core set fit 12 in the magnetic core holding chamber 21, in the both ends of the surface of the gap length direction of magnetic core set zoarium 12, the end face of X2 one side is subjected to the plus-pressure of aforementioned compressed part 25b, and magnetic core set zoarium 12 is compressed by the power F4 that points to the X1 direction.Like this, the end face of X1 one side of magnetic core set zoarium 12 contacts with location division 25a, and magnetic core set zoarium 12 is positioned at directions X.
Because the summit of the curve form of location division 25a and compressed part 25b is positioned on the center line by aforementioned center O, magnetic core set zoarium 12 is remained in the magnetic core set zoarium 12 reliably by location division 25a and compressed part 25b.And for example shown in Fig. 1 (C) and Fig. 2 (B), the length of aforementioned location division 25a and compressed part 25b is made at short transverse (Z direction) and half of magnetic core 12a, and the height dimension of 12b is roughly the same.Therefore, half of magnetic core 12a, the X1 of 12b, the end face total length of X2 side contacts with compressed part 25b with location division 25a.
That is, because slimming, the magnetic core set zoarium 12 that the height dimension of Z direction is little is compressed by location division 25a and compressed part 25b, and when reliably compressing between the apparent surface of gap, magnetic core set zoarium 12 can correctly be located on the gap length direction.Particularly, because the datum clamp face 13f of location division 25a and support 13 is in the same side, and near each other, therefore, and the position of the magnetic gap Ga of formation on magnetic core set zoarium 12, can be positioned at datum clamp face 13f is on the assigned position of benchmark.
In addition, the half of magnetic core 12a of the X1 side in the magnetic core set zoarium 12 is by the location division 25a location of the location division 23a and the end face of side.The position of magnetic core set zoarium 12 can this half of magnetic core 12a be that benchmark is determined.
Fig. 4 (A) is the part enlarged drawing of Fig. 3 (A) of the positioning states of expression magnetic core set zoarium 12.
The side 12A of a half of magnetic core 12a of magnetic core set zoarium 12 is pressed on by power F3 on the location division 2a of X1 side, and the end face 12B of half of magnetic core 12a is pressed on the location division 25a of end face by power F4.Because the location division 25a of end face is a curve form, therefore, the side 12A of half of magnetic core 12a easily and location division 23a be close to.In addition, owing to do not act on the half of magnetic core 12b towards the snap-in force of Y1 direction, half of magnetic core 12b has bigger degree of freedom, makes half of magnetic core 12b can follow half of magnetic core 12a and locatees.
Like this, shown in Fig. 4 (B), even location division 23a and 23b be not mutually on same plane, location division 23a has an angle θ with respect to X-axis, between with the half of magnetic core 12a and another half of magnetic core 12b of this location division 23a as the benchmark location,, can not resembling in the past, magnetic gap Ga do not increase less than the effect of the bending power of representing with β yet.
In addition, in the employed in this embodiment magnetic core set zoarium 12, the gap apparent surface 12c of half of magnetic core 12a can side 12A be a benchmark, grinds to form the right angle.Thereby when the forming accuracy that improves support 13, the tilt angle theta that makes aforementioned location division 23a is in the permissible value scope time, can be easily with the position angle of the magnetic gap Ga that forms by aforementioned gap apparent surface 12c, be set in the permissible value scope.
Because the aforementioned location division 25a that magnetic core set zoarium 12 is located in the X1 direction is a curve form, therefore, on the half of magnetic core 12a that contacts with location division 25a, be difficult to produce the extreme power of putting upside down again.For example, shown in Fig. 5 (A), even the monomer magnetic core of half of magnetic core 12a 1., 2., 3., 4. the overhang to the X1 direction has deviation, and the monomer magnetic core of side is 4. outstanding to the X1 direction, and 4. this monomer magnetic core also is difficult to produce the power of putting upside down to the α direction.
This point has just been understood when comparing with the comparative example shown in Fig. 5 (C) easily.In Fig. 5 (C) because the location division is the plane, when the monomer magnetic core 3. (perhaps the monomer magnetic core 4.) when the X1 direction was outstanding, the power of the putting upside down α that points to the Y2 direction acted on the half of magnetic core 12a that is subjected to power F4 effect easily.As a result, the side 12A of half of magnetic core 12a is difficult to be close to the location division 23a of side.In addition, even adopt the structure of the location division 23a that does not have the side, magnetic core set zoarium 12 also can be put upside down, and therefore, is difficult to set the position angle of magnetic gap Ga.
About this point, in Fig. 5 (A), because the aforementioned power of putting upside down α does not have extreme effect, therefore, half of magnetic core 12a location division the 23a easy and side is close to.Even without location division, side 23a is set, the magnetisation crack Ga that also has difficult labour puts upside down.
And for example shown in Fig. 5 (B), near the monomer magnetic core at the center of track width direction 2. under the outstanding situation of X1 direction because location division 25a is a curve form, monomer magnetic core corner part (イ) 2. contacts with location division 25a point.Therefore, corner part (イ) is trapped in the 25a of location division easily, is difficult to produce the 2. outstanding adverse effect of monomer magnetic core, i.e. the power of putting upside down of half of magnetic core.
Also be curve form owing to compressed part 25b again, and the radius-of-curvature of this curve form is littler than the radius-of-curvature of location division 25a, therefore, the summit of compressed part 25b makes snap-in force F4 act on the center of the Width of half of magnetic core 12a easily.Therefore, half of magnetic core 12a is subjected to power F4 effect at the center of its Width, is pressed on the 25a of location division, even like this, also is difficult to produce the extreme power of putting upside down on magnetic core set zoarium 12.
Like this, in illustrated magnetic head H, when on the support made from the PBT resin 13, form datum clamp face 13e and 13f and the time as the support jut 13g of bottom reference for installation, the forming accuracy of this support 13, can guarantee that with support 13 be benchmark, magnetic core set zoarium 12 is located on gap length direction and track width direction both direction.In addition, be benchmark with same support 13, also can make radome 11 in Y1 direction and X1 direction location.
As a result, the position of the magnetic gap Ga of magnetic core set zoarium 12 can be determined accurately with respect to support 13, and the center of radome 11 is also consistent with the center of support 13 easily, thereby can determine the relative position of radome 11 and magnetic core set zoarium 12 accurately.
As mentioned above, utilize the present invention that the magnetic core set zoarium is located in support accurately, and between half of magnetic core, do not have the bending force effect, gap length can not change.Even in very thin magnetic core set zoarium, also can obtain clamping force and detent force that half of magnetic core is engaged each other reliably.Radome also can be located accurately with respect to reference for installation.
Claims (14)
1. magnetic head, it has by nonmagnetic substance, and a pair of half of magnetic core is engaged, and forms the magnetic core set zoarium of magnetic gap; Keep the support of this magnetic core set zoarium and the radome of this magnetic core set zoarium of cover and support; It is characterized by, in this magnetic head, be provided with location division that an end face in the both ends of the surface with the gap length direction of aforementioned magnetic core set zoarium contacts and the other end is pressed on compressed part on the aforementioned location division; At least one part of aforementioned location division and compressed part is towards the outstanding curve form of the direction of aforementioned magnetic core set zoarium.
2. magnetic head as claimed in claim 1 is characterized by, and the two is curve form aforementioned location division and compressed part, and the radius-of-curvature of the curve form of aforementioned location division is bigger than the radius-of-curvature of aforementioned compressed part.
3. magnetic head as claimed in claim 1 or 2 is characterized by, and the summit of curve form is positioned at the center of the track width direction of magnetic core set zoarium.
4. magnetic head, it has by nonmagnetic substance, and a pair of half of magnetic core is engaged, and forms the magnetic core set zoarium of magnetic gap; Keep the support of this magnetic core set zoarium and the radome of this magnetic core set zoarium of cover and support; It is characterized by, in this magnetic head, when with the outside surface vertical during, be provided with the location division, side of the contacts side surfaces of at least one half of magnetic core and only an aforementioned half of magnetic core be pressed on compressed part on the location division, aforementioned side as the side with the gap apparent surface of aforementioned magnetic core set zoarium.
5. magnetic head as claimed in claim 4, it is characterized by, when with the outside surface of the gap length direction both sides of magnetic core set zoarium during as end face, in magnetic head, be provided with end face location division that contacts with the end face of an aforementioned half of magnetic core and the compressed part of the other end of magnetic core set zoarium being pressed to aforementioned end face location division.
6. as claim 4 or 5 described magnetic heads, it is characterized by, the gap apparent surface of an aforementioned half of magnetic core of magnetic core set zoarium is ground as reference field in the side that location division, available and aforementioned side contacts.
7. as any one described magnetic head in the claim 4 to 6, it is characterized by, volume has the coil rack of coil to be inserted in this magnetic core set zoarium throughly, utilize aforementioned compressed part to compress the part of this coil rack, this snap-in force also can be pressed on an aforementioned half of magnetic core on this location division, side.
8. as any one described magnetic head in the claim 1 to 7, it is characterized by, on support, integrally form two parts of aforementioned location division and compressed part.
9. magnetic head, it has by nonmagnetic substance, and a pair of half of magnetic core is engaged, and forms the magnetic core set zoarium of magnetic gap; Keep the support of this magnetic core set zoarium and the radome of this magnetic core set zoarium of cover and support; It is characterized by, in aforementioned brackets, be respectively equipped with inside surface opposite external side face with aforementioned radome, on a lateral surface, be standing shape and integrally form the compressed part that compresses the radome inside surface, and on another lateral surface, form the location division that contacts with another inside surface of the radome that compresses by aforementioned compressed part.
10. magnetic head, it has by nonmagnetic substance, and a pair of half of magnetic core is engaged, and forms the magnetic core set zoarium of magnetic gap; Keep the support of this magnetic core set zoarium and the radome of this magnetic core set zoarium of cover and support; It is characterized by, aforementioned brackets is in radome, the whole structure that forms magnetic core retaining part that keeps this magnetic core set zoarium and the mounting portion of giving prominence to towards the radome outside, and radome is then compacted to remain between aforementioned magnetic core retaining part and the mounting portion.
11. magnetic head as claimed in claim 10 is characterized by, and forms the location division contact with the outside surface of aforementioned radome on aforementioned mounting portion, and on the magnetic core retaining part, formation compresses the inside surface of radome towards aforementioned location division direction compressed part
12. as claim 10 or 11 described magnetic heads, it is characterized by, mutually perpendicular two sides of aforementioned mounting portion are datum clamp face.
13. as any one described magnetic head in the claim 1 to 12, it is characterized by, on the support bottom surface, integrally form at least three support juts as reference for installation.
14. as any one described magnetic head in the claim 1 to 13, it is characterized by, this support is by PBT (polybutadiene terephthalate), PET (polyethylene terephthalate), PA (polyamide), PC (polycarbonate), POM (polyacetal), PPE (polyphenylene oxide), PPS (polyphenylene sulfide), PAR (poly-arylide), any engineering plastics in PMP (polymethylpentene) and the polyfurolresin are made.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP316917/97 | 1997-11-18 | ||
| JP316917/1997 | 1997-11-18 | ||
| JP31691797A JP3609595B2 (en) | 1997-11-18 | 1997-11-18 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1217530A true CN1217530A (en) | 1999-05-26 |
| CN1139913C CN1139913C (en) | 2004-02-25 |
Family
ID=18082362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981236006A Expired - Fee Related CN1139913C (en) | 1997-11-18 | 1998-11-06 | Magnetic head |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3609595B2 (en) |
| CN (1) | CN1139913C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102806530A (en) * | 2012-08-01 | 2012-12-05 | 浙江田中精机股份有限公司 | Magnetic core clamping device |
| CN104424461A (en) * | 2013-08-30 | 2015-03-18 | 北京泰和磁记录制品有限公司 | Production method of magnetic head component, magnetic head component, magnetic card magnetic head and magnetic card reader |
| CN104416740A (en) * | 2013-08-30 | 2015-03-18 | 北京泰和磁记录制品有限公司 | Magnetic card head and production method thereof as well as magnetic card reader |
| CN108108639A (en) * | 2018-02-02 | 2018-06-01 | 北京泰和磁记录制品有限公司 | Magnetic card reader and its magnetic card magnetic head |
-
1997
- 1997-11-18 JP JP31691797A patent/JP3609595B2/en not_active Expired - Fee Related
-
1998
- 1998-11-06 CN CNB981236006A patent/CN1139913C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102806530A (en) * | 2012-08-01 | 2012-12-05 | 浙江田中精机股份有限公司 | Magnetic core clamping device |
| CN102806530B (en) * | 2012-08-01 | 2015-01-28 | 浙江田中精机股份有限公司 | Magnetic core clamping device |
| CN104424461A (en) * | 2013-08-30 | 2015-03-18 | 北京泰和磁记录制品有限公司 | Production method of magnetic head component, magnetic head component, magnetic card magnetic head and magnetic card reader |
| CN104416740A (en) * | 2013-08-30 | 2015-03-18 | 北京泰和磁记录制品有限公司 | Magnetic card head and production method thereof as well as magnetic card reader |
| CN108108639A (en) * | 2018-02-02 | 2018-06-01 | 北京泰和磁记录制品有限公司 | Magnetic card reader and its magnetic card magnetic head |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3609595B2 (en) | 2005-01-12 |
| CN1139913C (en) | 2004-02-25 |
| JPH11149607A (en) | 1999-06-02 |
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20040225 Termination date: 20101106 |