CN1229982A - Returning head device and its mounting method - Google Patents
Returning head device and its mounting method Download PDFInfo
- Publication number
- CN1229982A CN1229982A CN99103394A CN99103394A CN1229982A CN 1229982 A CN1229982 A CN 1229982A CN 99103394 A CN99103394 A CN 99103394A CN 99103394 A CN99103394 A CN 99103394A CN 1229982 A CN1229982 A CN 1229982A
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- mentioned
- magnetic drum
- ground brush
- revolution
- bolster
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/61—Guiding record carrier on drum, e.g. drum containing rotating heads
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
- G11B5/53—Disposition or mounting of heads on rotating support
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- Manufacturing & Machinery (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
The present invention provides a rotaray head and its assembly method which can prevent the fall of an earth brush during the assembly, and can detect the presence or the absence of the earth brush at the same time. The method detects the presence or the absence of the earth brush by forming a through-hole having a smaller shape than the shape of the earth brush on the fixed member, which is located on the back surface side of the earth brush in a storage section.
Description
The present invention relates to as the returning head device that uses in the Video/tape/recorder of magnetic recording/reproducing apparatus etc.
Fig. 8 is the sectional view of existing returning head device, and Fig. 9 is the sectional view of amplification of the major part of existing returning head device.As Fig. 8 and shown in Figure 9, the returning head device that uses in existing magnetic recording/reproducing apparatus has the fixedly magnetic drum K below being positioned at, with this fixedly the relative configuration in top of magnetic drum K revolution magnetic drum R and be configured in the motor M of this revolution magnetic drum R top.In the center pit Ka of said fixing magnetic drum K, fixing an end 31a of bolster 31.This bolster 31 is columniform, with external magnetic record reproducing device (not illustrating among the figure) ground connection.
In addition, can on the revolution magnetic drum R of bolster 31 for the center rotation magnetic head 32 be installed.
Be installed in the ball bearing 34 of the centre of gyration of revolution magnetic drum R, by inner ring 34a, outer ring 34b and be configured in inner ring 34a and outer ring 34b between ball 34c constitute.Two ball bearing 34 with this structure are fixed on the upper and lower side of the center pit 35 of rotary drum R; Outer ring 34b is pressed in this center pit.The inner ring 34a of these two ball bearing 34 is pressed on the bolster 31, and its outer ring 34b and revolution magnetic drum R rotate by ball 34c.
During record vision signal is supplied with magnetic head 32, when reproducing simultaneously, take out the rotary transformer 36 of reproducing signal, constitute by fixation side transformer 36a and revolution side transformer 36b.In addition, this rotary transformer 36 is provided in fixedly between magnetic drum K and the revolution magnetic drum R under the state that is positioned at ball bearing 34 bottoms; And fixation side transformer 36a is installed in fixedly on the magnetic drum K, and revolution side transformer 36b is installed on the revolution magnetic drum R.Revolution side transformer 36b rotates with revolution magnetic drum R.
Again, above-mentioned motor M is made of the rotor 38 that is bearing in the stator 37 on the fixed component 37a and be installed on the revolution magnetic drum R.Stator 37 be by with the other end 31b that is installed in bolster 31 with method such as be pressed on fixed component 39, the magnetic core 37e formation that is installed in the motor control loop substrate 37c on this fixed component 39 and makes with loop figure (not illustrating among the figure) magnetic metal electrically conducting, that be provided with coil 37d of this motor control loop substrate 37c.
Here, motor control loop substrate 37c is assembled in motor control loop on the printed base plate, and the power supply that the magnetic recording/reproducing apparatus body that it will not illustrate from figure is sent is supplied with coil 37d, and turns round the revolution control of magnetic drum R.
In said fixing member 39, be provided with the blind hole 39a of a given depth.In this blind hole 39a, put into volute spring 40 and by the ground brush 41 of this volute spring elastic compression.The outer ring 34b Elastic Contact of this ground brush 41 and ball bearing 34.
And ground brush 41 is by volute spring 40 and fixed component 39 ground connection; Fixed component 39 and bolster 31 ground connection; This bolster 31 then with magnetic recording/reproducing apparatus (not illustrating among the figure) ground connection.
In addition, rotor 38 is made of installing plate 38c and cylindrical shape magnet 38e.This installing plate 38c forms cup-shaped by bottom parts 38a and cylindrical portions may 38b; This cylindrical shape magnet 38e then is adhesively fixed on this cylindrical portions may 38b.The base plate 38a of installing plate 38c is installed on the revolution magnetic drum R.
Above-mentioned magnetic core 37e is configured in the columnar magnet 38e, and magnetic core 37e has identical gap S with magnet 38e on whole circumference, toward each other.
The revolution magnetic drum R of above-mentioned existing returning head device drives revolution by motor M, and the revolution of this revolution magnetic drum R drives magnetic head 32 revolutions again.Tape T is with given snap-in force P, is in to compress under the contact condition with magnetic head 32 and moves, and writes down or reproduces.At this moment, because the factor affecting such as slip between revolution magnetic drum R and the tape T produce static on revolution magnetic drum R.
This static savings is on the 34b of the outer ring of ball bearing 34, and outer ring 34b and the inner ring 34a that is connected with bolster 31 connect by ball 34c.Owing on ball 34c, be coated with lubricating oil, hinder electrically conducting, therefore, be difficult to make on the 34b of outer ring with static be released on the bolster 31 from inner ring 34a.
Like this, volute spring 40 makes the outer ring 34b Elastic Contact of ground brush 41 and ball bearing 34, therefore, can make on the revolution magnetic drum R with static, be released into bolster 31 from fixed component 37a.And the electric upward conducting of the magnetic recording/reproducing apparatus that does not illustrate among above-mentioned bolster 31 and the figure becomes ground state.
The assembling of the existing returning head device of said structure is (not illustrate among the figure) the fixedly magnetic drum K of bolster 31 and fixation side transformer 36a being housed, being placed on the assembling jig.
Secondly,, insert bolster 31, make fixation side transformer 36a and relative installation of revolution side transformer 36b revolution side transformer 36b and the inner ring 34a that the revolution magnetic drum R of ball bearing 34 is housed.
Then, the fixed component 39 of volute spring 40 and ground brush 41 will be housed in blind hole 39a, insert, fixed component 39 is contacted with ball bearing 34,, fixed component 39 will be installed on the bolster 31 again with stop screw etc. from the other end 31b of bolster 31.
Follow again, the rotor 38 of motor M be installed on the revolution magnetic drum R, simultaneously, with screw will with the electric motor control loop substrate 37c that goes up conducting of the magnetic core 37e that is provided with coil 37d, be fixed on the fixed component 39.Like this, existing returning head device has just assembled.
Therefore, when giving motor control loop substrate 37c energising, rotor 38 rotates, and simultaneously, revolution magnetic drum R rotates.
But, in existing returning head device, because with stop screw etc., the fixed component 39 of volute spring 40 and ground brush 41 will be housed in blind hole 39a, be installed on the bolster 31, therefore, the ground brush 41 that is contained among the blind hole 39a can come off.
When this ground brush 41 comes off from blind hole 39a, can not make the static that on above-mentioned revolution magnetic drum R, has, be released on the bolster 31, like this, just can not on tape T, carry out suitable record and reproduction.
The invention solves the problems referred to above, its objective is to provide a kind of can make reliably with static be released into returning head device on the ground connection figure and assembly method thereof.
As the first method that addresses the above problem, returning head device of the present invention has fixedly magnetic drum; Be fixed on this fixedly bolster on the magnetic drum; Rotatable support has the revolution magnetic drum of magnetic head on this bolster; Fixed component and ground brush; This fixation means arrangement arranged becomes and the relative state of this revolution magnetic drum, and it is fixed on the above-mentioned bolster; This ground brush then in the relative side of above-mentioned revolution magnetic drum, is installed on the said fixing member; This ground brush and above-mentioned revolution magnetic drum Elastic Contact simultaneously, on the said fixing member of the back side of above-mentioned ground brush one side, form than the little through hole of above-mentioned ground brush shape.
As the second method that addresses the above problem, on above-mentioned revolution magnetic drum, have parts of bearings, it constitutes the part of this revolution magnetic drum, and rotatably support above-mentioned bolster; On position relative on the said fixing member with above-mentioned parts of bearings, make the holding portion of given depth, above-mentioned through hole is set continuously, so that ground brush and give the afterburning member of this ground brush elastic stressing is placed in the above-mentioned holding portion on this holding portion.
As the third method that addresses the above problem, on the said fixing member, form protuberance in a side relative with the axial above-mentioned revolution magnetic drum of above-mentioned supporting; Utilize this protuberance can between above-mentioned revolution magnetic drum and said fixing member, form given gap.
As the 4th kind of method that addresses the above problem, above-mentioned parts of bearings is made up of the ball bearing with outer ring and inner ring, and this outer ring constitutes the part of above-mentioned revolution magnetic drum, and inner ring is axial location on above-mentioned bolster then; The contacts side surfaces of the protuberance of said fixing member and the inner ring of this ball bearing, the outer ring Elastic Contact of above-mentioned ground brush and above-mentioned ball bearing, when above-mentioned revolution magnetic drum is rotated, also rotate above-mentioned outer ring, the side of this outer ring then with above-mentioned ground brush Elastic Contact, and slide thereon.
As the 5th kind of method that addresses the above problem, returning head device of the present invention has the revolution magnetic drum that has magnetic head; Be fixed on this revolution magnetic drum, and can be with turning round the bolster that magnetic drum rotates; Rotatably support the fixedly magnetic drum of this bolster; Fixedly magnetic drum is relative disposes with this, is fixed on the above-mentioned bolster rotary revolving member; With the ground brush that is installed in a side relative on the above-mentioned revolving member with the said fixing magnetic drum; This ground brush and said fixing magnetic drum Elastic Contact simultaneously, on the above-mentioned revolving member of the back side of above-mentioned ground brush one side, form than the little through hole of above-mentioned ground brush shape.
The 6th kind of method as addressing the above problem has parts of bearings on the said fixing magnetic drum, it constitutes the part of said fixing magnetic drum, and rotatably support above-mentioned bolster; On the position relative, make the holding portion of given depth with the above-mentioned parts of bearings of above-mentioned revolving member; Above-mentioned through hole is set continuously, so that above-mentioned ground brush and give the afterburning member of this ground brush elastic stressing is placed in this holding portion on this holding portion.
As the 7th kind of method that addresses the above problem, above-mentioned revolving member forms protuberance in a side relative with the axial said fixing magnetic drum of above-mentioned supporting, utilizes this protuberance can form given gap between said fixing magnetic drum and above-mentioned revolving member.
As the 8th kind of method that addresses the above problem, above-mentioned parts of bearings is made up of the ball bearing with outer ring and inner ring, and the outer ring constitutes the part of said fixing magnetic drum, and inner ring is axial location on rotary above-mentioned bolster; The inner ring contacts side surfaces of the protuberance of above-mentioned revolving member and above-mentioned ball bearing, the outer ring Elastic Contact of above-mentioned ground brush and above-mentioned ball bearing, when above-mentioned revolving member rotated, above-mentioned ground brush and above-mentioned outer ring Elastic Contact were also slided thereon.
In addition, as the 9th kind of method that addresses the above problem, proposed the assembly method of returning head device of the present invention, this returning head device is made of following part: fixing magnetic drum; Be fixed on this fixedly bolster on the magnetic drum; Be rotatably supported on this bolster, have the revolution magnetic drum of magnetic head; Be configured to relatively, be fixed on the fixed component on the above-mentioned bolster with this revolution magnetic drum; Be installed in the ground brush on the relative side with above-mentioned revolution magnetic drum of this fixed component; On the said fixing member, make the holding portion of placing this ground brush, and on the said fixing member of the back side one side of the above-mentioned ground brush in being placed on above-mentioned holding portion, make than the little through hole of above-mentioned ground brush shape; The above-mentioned ground brush that utilizes assembling jig to prevent to be placed on the above-mentioned holding portion comes off, and simultaneously, will detect pin and insert in the above-mentioned through hole, detects to have or not above-mentioned ground brush.
As the tenth kind of method that addresses the above problem, the assembly method of returning head device of the present invention is, insert the above-mentioned detection pin in the above-mentioned through hole, can be according to having or not above-mentioned ground brush to move in the above-mentioned holding portion, the mobile detection means that makes of this detection pin is moved, and can detect to have or not above-mentioned ground brush.In addition, also be provided with pressed component.
The embodiment of returning head device of the present invention below is described.
Fig. 1 is the sectional view of first embodiment of returning head device of the present invention;
Fig. 2 is the amplification profile of major part of first embodiment of returning head device of the present invention;
Fig. 3 is the sectional view of second embodiment of returning head device of the present invention;
Fig. 4 is the sectional view of the distortion example of first embodiment of expression returning head device of the present invention;
Fig. 5 is the skeleton diagram of the assembly method of explanation returning head device of the present invention;
Fig. 6 is the skeleton diagram of the assembly method of explanation returning head device of the present invention;
Fig. 7 is the skeleton diagram of the assembly method of explanation returning head device of the present invention;
Fig. 8 is the sectional view of existing returning head device;
Fig. 9 is the amplification profile of the major part of existing returning head device.
As depicted in figs. 1 and 2, first embodiment of returning head device of the present invention, by the fixedly magnetic drum K that is positioned at the below, be configured in this fixedly magnetic drum K top revolution magnetic drum R and be configured in the motor M formation of this revolution magnetic drum R top.
In the axis hole Ka at the center of said fixing magnetic drum K,, fixing an end 1a of bolster 1 cylindrical, that make by the conductive material of lengthwise with method such as being pressed into.When returning head device of the present invention being installed on the magnetic recording/reproducing apparatus body that does not illustrate in the drawings, an end 1a or the other end 1b of bolster 1 are with magnetic recording/reproducing apparatus ground connection.
In addition, magnetic head 2 is by screw 3, is installed on the revolution magnetic drum R that can bolster 1 rotates for the center.
On above-mentioned revolution magnetic drum R, has the ball bearing 4 that constitutes by outer ring 4b and inner ring 4a; This outer ring 4b is made by the conductive material of a part that constitutes this revolution magnetic drum R, and inner ring 4a is axial location on bolster 1 then.This ball bearing 4 also has the ball 4c that is configured between inner ring 4a and the outer ring 4b.Two ball bearing 4 of this structure are fixed on the upper and lower side of the center pit 5 of revolution magnetic drum R, with method such as being pressed into outer ring 4b are fixed in the center pit of this revolution magnetic drum.The inner ring 4a of these two ball bearing 4 inserts on the bolster 1, and axial location; And outer ring 4b and revolution magnetic drum R rotate by ball 4c.Above-mentioned outer ring 4b is made by the hard steel of quality, and its side is through mirror finish.
In addition, during record, vision signal is supplied with magnetic head 2, simultaneously, when reproducing, take out the rotary transformer 6 of reproducing signal, constitute by fixation side transformer 6a and revolution side transformer 6b.When the state following time of this rotary transformer 6 in the bottom that is positioned at ball bearing 4, it is configured in fixedly between the magnetic drum K and revolution magnetic drum R.And fixation side transformer 6a is installed in fixedly on the magnetic drum K; Revolution side transformer 6b then is installed on the revolution magnetic drum R.Revolution side transformer 6b rotates with revolution magnetic drum R.
Be installed in the above-mentioned motor M on revolution magnetic drum R top, constitute by stator 7 and the rotor 8 that is installed on the revolution magnetic drum R.Said stator 7 is by fixed component 9, and magnetic core 7e and motor control loop substrate 7c constitute.This fixed component 9 is fixed on the bolster 1 by stop screw 9d etc., and it is made by conductive material.This magnetic core 7e is made by the magnetic metal that is provided with coil 7d, and magnetic core 7e is fixed on the excircle part of this fixed component 9; And motor control loop substrate 7c then is installed on the fixed component 9 by screw 7b.Above-mentioned motor control loop substrate 7c is assembled in a plate on the printed base plate with motor control loop, the power supply that the record reproducing device body that it will not illustrate from figure is sent, supply with coil 7d, and turn round the revolution control of magnetic drum R by the revolution of control rotor 8.
In addition, rotor 8 is made of installing plate 8c, screw 8d and cylindrical shape magnet 8e.This installing plate 8c forms cup-shaped by bottom parts 8a and cylindrical shape part 8b; This screw 8d is installed in this bottom parts 8a on the revolution magnetic drum R; This magnet 8e then is adhesively fixed on the cylindrical shape part 8b.Above-mentioned magnetic core 7e is configured in the cylindrical shape magnet 8e, forms magnetic gap between magnetic core 7e and the magnet 8e, toward each other.
On fixed component 9, from a revolution magnetic drum R relative side, make the holding portion 9a of a given depth.This holding portion 9a can (for example) blind hole shape, is made on the position relative with the outer ring 4b of ball bearing 4.In this holding portion 9a, placing as the volute spring 10 of the afterburning member of good conductivity and the columniform ground brush of making by good brass of sliding etc. 11.
Like this, be contained in the back side of the ground brush 11 among the holding portion 9a,, be pressed on the outer ring 4b of ball bearing 4 by volute spring 10 as afterburning member; And the front end of ground brush 11 contacts with side elastic as the outer ring 4b of the part of revolution magnetic drum R.
In addition, on the fixed component 9 of the back side one side of the ground brush in being contained in holding portion 9a, be a through hole 9b littler than the shape of ground brush 11.
Here, the size of this through hole 9b is the size of the part in the hole that is communicated with holding portion 9a at least, and it should be littler than the profile of volute spring 10 and ground brush 11.That is, its size should not hinder the location of above-mentioned member in holding portion that is contained among the holding portion 9a.In the embodiment of Fig. 1 and Fig. 2, through hole 9b is made on the longitudinal direction of bottom of holding portion 9a, and the direction of installing on bolster 1 with fixed component 9 is consistent; But, also can be in the side of ground brush 11, along what communicate through hole (not illustrating among the figure) is set in a lateral direction with the excircle side of fixed component 9.
On the fixed component 9 that is fixed on the above-mentioned bolster 1, with round the relative side of the revolution magnetic drum R of bolster 1, form a protuberance 9c.By this protuberance 9c, between outer ring 4b and fixed component 9, form given gap 9e as the ball bearing 4 of the part of revolution magnetic drum R.
The revolution magnetic drum R of the returning head device of the invention described above drives revolution by motor M, and the rotation of this revolution magnetic drum R drives magnetic head 2 and also rotates.Tape T compresses under the state of contact mobilely at snap-in force P and this magnetic head 2 with regulation, write down or reproduce.At this moment, because the influences such as slip between revolution magnetic drum R and the tape T produce static on revolution magnetic drum R, this static makes the outer ring 4b of ball bearing 4 also charged.
For make this outer ring 4b with static, be released into bolster 1, and remove static, the grounding path of returning head device of the present invention is, from with the ground brush 11 of the outer ring 4b Elastic Contact of ball bearing 4, via volute spring 10, be released on the fixed component 9, from fixed component 9 and bolster 1 ground connection, remove static again.
Utilize Fig. 5 to Fig. 7 that the assembly method of the returning head device of the present invention of said structure is described now.At first, as shown in Figure 5,, an end 1a of bolster 1 is fixed among the axis hole Ka, again inner face has been installed the fixedly magnetic drum K of fixation side transformer 6a, be placed on the mounting yoke J1 of assembling jig J in advance by method such as being pressed into.
Secondly, the revolution magnetic drum R of revolution side transformer 6b and ball bearing 4 will be installed,, will turn round magnetic drum R and be placed on fixedly on the magnetic drum K, toward each other from being installed in the other end 1b insertion of the bolster 1 on the fixing magnetic drum K.
Then, as shown in Figure 6,, secondly be that ground brush 11 is put into holding portion 9a with volute spring 9b; Again this fixed component 9 is inserted on the installation component J2 of assembling jig J, utilizes by what leaf spring etc. was made and prevent to come off member J3, prevent that the ground brush 11 of putting into above-mentioned holding portion 9a from deviating from.Simultaneously, according to the situation that has or not ground brush 11, can insert among the through hole 9b at the detection pin J4 that above-below direction moves.
This detects pin J4 can be according to having or not ground brush 11 to move in holding portion 9a.Detect moving of pin J4, can make to be installed in and detect detection means S pin J4 top, that forms by pushbutton switch etc. and move, detect and have or not ground brush 11.
Be placed under the state of the ground brush 11 in the holding portion 9a in detection means S detection, fixed component 9 is inserted from the other end 1b that it holds axle 1.Like this, the contacts side surfaces of the protuberance 9c of fixed component 9 and the inner ring 4a of ball bearing 4 is among the gap 9e that the member J3 that prevents to come off forms between fixed component 9 and outer ring 4b.
Then, with stop screw 9d fixed component 9 is fixed on the bolster 1.When from this state,, when fixed component 9 takes off,, contact with side elastic as the outer ring 4b of the part of revolution magnetic drum R by the ground brush 11 of volute spring 10 elastic compressions with the mounting structure J2 of assembling jig J.
Secondly, with screw 8d the rotor 8 of motor M is installed on the revolution magnetic drum R; Simultaneously, the magnetic core 7e that is provided with coil 7d shown in Figure 1 is installed on the fixed component 9.In addition, with screw 7b motor control loop substrate 7c is installed on the fixed component 9; Simultaneously, with the loop figure (not illustrating among the figure) of coil 7d and motor control loop substrate 7c, couple together on electric, returning head device of the present invention has just assembled.
By giving motor control loop substrate 7c energising, rotor 8 revolutions simultaneously, are turned round magnetic drum R and are also turned round.
Second embodiment of returning head device of the present invention is described below.Utilize the sectional view of second embodiment of the present invention shown in Figure 3 to describe.At first, be configured in the revolution magnetic drum 51 that magnetic head 2 has been installed in the top; When this revolution magnetic drum 51 rotates,, rotary bolster 1 is fixed on turns round on the magnetic drum 51 with method such as being pressed into.
Below relative, dispose a fixedly magnetic drum 52 that ball bearing 4 is installed with above-mentioned revolution magnetic drum 51.
Be configured in the fixedly motor M of magnetic drum 52 belows, constitute by being installed in stator 57 on the fixing magnetic drum 52 and the rotor 58 that is bearing on the revolving member.
Said stator 57 is made of installing plate 57c, screw 57d, cylindrical shape magnet 57e and motor control loop substrate 57f.Installing plate 57c forms cup-shaped by bottom parts 57a and cylindrical shape part 57b; Screw 57d is installed in this bottom parts 57a fixedly on the magnetic drum 52; Cylindrical shape magnet 57e is adhesively fixed on the cylindrical shape part 57b; And motor control loop substrate 57f then is installed in the lower end of cylindrical shape part 57b with (not illustrating among the figure) such as bonding agents.
In addition, the magnetic core 58e that makes of the fixed component 59 made by conductive material of rotor 58 and the magnetic metal that is provided with coil 58d constitutes.Said fixing member 59 under the state relative with fixing magnetic drum 52, with stop screw 59d etc., is tightened and is fixed on the bolster 1; Above-mentioned magnetic core 58e then is fixed on the excircle part of this fixed component 59.Above-mentioned magnetic core 58e is configured in the columnar magnet 57e, forms magnetic gap between magnetic core 58e and the magnet 57e, toward each other.
Above-mentioned motor control loop substrate 57f is that motor control loop is assembled in a plate on the printed base plate, utilize sliding brush (not illustrating among the figure) etc., the power supply that the record reproducing device body that will not illustrate from figure is sent is supplied with coil 58d, and revolution by control rotor 58, make bolster 1 revolution, thereby be fixed on the revolution control of the revolution magnetic drum 51 on the bolster 1.
In above-mentioned revolving member 59, the holding portion 9a of the fixed component 9 of formation and above-mentioned first embodiment, holding portion 59a, through hole 59b and protuberance 59c that through hole 9b is identical with protuberance 9c.In holding portion 59a, packed into as described volute spring 10 of first embodiment and ground brush 11.The outer ring 4b Elastic Contact of this ground brush 11 and ball bearing 4.Like this, along with the rotation of the rotor 58 of motor M, when revolving member 59 rotated, ground brush 11 contacted with the side elastic of the outer ring 4b of ball bearing 4, and slip thereon.
Other structure is identical with above-mentioned first and second embodiment, and same part all marks with identical label, omits its explanation here.
The assembling of the returning head device of second embodiment like this, be that returning head device with state shown in Figure 4 reverses, promptly allow the revolution magnetic drum 51 below, fixedly magnetic drum 52 up, then according to similarly assembling with the described assembly method of above-mentioned first embodiment.
But the parts different with above-mentioned first embodiment are that the installation of the motor control loop substrate 57f of motor M is that this substrate is installed on the cylindrical shape part 57b of cup-shaped with bonding agent etc.
That is, second embodiment of the present invention is motor M stator 57 is to be made of cup-shaped installing plate 57c; Rotor 58 is to be made of the magnetic core 58e that is installed on the revolving member 59; By making this rotor 58 revolutions, revolving member 59 turns round, bolster 1 revolution, simultaneously, 51 revolutions of revolution magnetic drum.
In first and second embodiment of above-mentioned returning head device of the present invention, with columniform conductive member ground brush 11 has been described, but also passable with the conductive member formation of leaf-spring-like ground brush 21 shown in Figure 4.
The ground brush 21 of above-mentioned leaf-spring-like is placed among the shallow holding portion 19a that makes on the fixed component shown in Figure 4 19, and electric go up and this holding portion couples together.
In addition, on the fixed component 19 of the back side one side of the ground brush 21 in being installed on above-mentioned holding portion 19a, make the through hole 19b littler than the shape of ground brush 21.
Returning head device of the present invention, because when making ground brush and turning round the magnetic drum Elastic Contact, on the fixed component of the above-mentioned ground brush back side one example, make the through hole littler than the shape of above-mentioned ground brush, insert in this through hole by detection pin, can detect when assembling assembling jig, or after the assembling, have or not ground brush, can prevent that the bad of ground brush from coming off.
In addition, owing in the revolution magnetic drum parts of bearings is arranged, it constitutes the part of this revolution magnetic drum, and rotatably support above-mentioned bolster; On position on the said fixing member, relative with the side of above-mentioned bearing, make the holding portion of given depth; In this holding portion, also be provided with above-mentioned through hole continuously, so that with above-mentioned ground brush with give the afterburning member of this ground brush elastic stressing, pack in the above-mentioned holding portion, like this, only need and to pack in the above-mentioned holding portion as the volute spring of afterburning member and ground brush, can go up conducting so that ground brush and fixed component are electric, therefore, do not need special installation component etc., can reach reliable conducting with a spot of part.
In addition, insert in the above-mentioned through hole, can easily detect and have or not ground brush, can accomplish not have the bad of ground brush to come off by detection pin with assembling jig.
In addition, owing in the said fixing member, form protuberance on a side relative with the axial above-mentioned revolution magnetic drum of above-mentioned supporting, this protuberance can form predetermined gap between above-mentioned revolution magnetic drum and said fixing member; Like this, will prevent that intactly the ground brush member that comes off is installed on the fixed component that ground brush is housed, even be installed on the bolster, the above-mentioned member that prevents to come off also can be arranged in above-mentioned gap.Therefore, owing to before assembling is finished, do not need to take off this and prevent the member that comes off, thereby can prevent reliably that ground brush from coming off.
Again, since above-mentioned parts of bearings by have the outer ring that constitutes an above-mentioned revolution magnetic drum part and on above-mentioned bolster the ball bearing of the inner ring of axial location form, the inner ring contacts side surfaces of the protuberance of said fixing member and this ball bearing, the outer ring Elastic Contact of above-mentioned ground brush and above-mentioned ball bearing, when above-mentioned revolution magnetic drum is rotated, when also rotate above-mentioned outer ring, the side of this outer ring and above-mentioned ground brush Elastic Contact, and slide thereon, therefore, utilize raised part except ball bearing can be installed, also can eliminate the axial play of bolster.In addition because level and smooth surface is processed in the side of outer ring, and the hardness height, therefore by side, outer ring and ground brush Elastic Contact, and slip thereon, can make the outer ring with static, be released on the bolster reliably.
In addition, owing to make the ground brush that is installed on the rotary revolving member, in the time of with fixing magnetic drum Elastic Contact, on the above-mentioned revolving member of the back side of above-mentioned ground brush one side, form than the little through hole of above-mentioned ground brush shape, therefore, insert in this through hole by detection pin assembling jig, after can or assembling when assembling, detection has or not ground brush, and can prevent that the bad of ground brush from coming off.
Moreover owing to have parts of bearings on the said fixing magnetic drum, it constitutes this fixedly part of magnetic drum, can support above-mentioned bolster rotationally; Again on the position relative with the above-mentioned bearing side of above-mentioned revolving member, be provided with the holding portion of given depth, above-mentioned through hole is set in this holding portion continuously, so that make above-mentioned ground brush and the afterburning member of this ground brush elastic stressing be placed in this holding portion, therefore, only volute spring and ground brush need be placed in the above-mentioned holding portion, get final product conducting on ground brush and fixed component are electric; And do not need special installation component, only use a spot of part, can reach reliable conducting.
Again, insert in the above-mentioned through hole, can easily detect and have or not ground brush, and can eliminate the bad of ground brush and come off by detection pin with assembling jig.
In addition, because above-mentioned revolving member, on a side relative with the axial said fixing magnetic drum of above-mentioned supporting, form protuberance, this protuberance forms given gap between said fixing magnetic drum and above-mentioned revolving member, therefore, to prevent that intactly the ground brush member that comes off is installed on the fixed component that ground brush is housed, even be installed on the bolster, the above-mentioned member that prevents to come off also can be in the above-mentioned gap.Therefore, before assembling finishes, can not need to take out this and prevent the member that comes off, so can prevent reliably that ground brush from coming off.
Because above-mentioned parts of bearings is made up of the ball bearing with outer ring and inner ring, this outer ring constitutes the fixedly part of magnetic drum, and inner ring is axial location on rotary above-mentioned bolster; The inner ring contacts side surfaces of the protuberance of above-mentioned revolving member and above-mentioned ball bearing, the outer ring Elastic Contact of above-mentioned ground brush and above-mentioned ball bearing, when above-mentioned revolving member turns round, above-mentioned ground brush and above-mentioned outer ring Elastic Contact, and slide thereon, therefore, contact with the outer ring side elastic and slide thereon by ground brush, can make the outer ring with static be released on the bolster reliably.
In addition, the assembly method of returning head device of the present invention is the assembly method of a kind of ground brush returning head device that can not come off.It is to come off with the ground brush that assembling jig prevents to be contained in the holding portion, simultaneously, inserts in the through hole owing to will detect pin, has or not above-mentioned ground brush so that detect, and therefore can prevent that ground brush from coming off from holding portion.
In addition, owing to insert the above-mentioned detection pin in the through hole, can be according in above-mentioned holding portion, having or not above-mentioned ground brush, and move, this detects moving of pin, makes the detection means action, detection has or not above-mentioned ground brush, therefore, by making above-mentioned detection means action, can detect coming off of ground brush more reliably.
Claims (10)
1. a returning head device is characterized by, and it has fixedly magnetic drum; Be fixed on this fixedly bolster on the magnetic drum; Rotatable support has the revolution magnetic drum of magnetic head on this bolster; Fixed component and ground brush; This fixation means arrangement arranged becomes and the relative state of this revolution magnetic drum, and it is fixed on the above-mentioned bolster; This ground brush then in the relative side of above-mentioned revolution magnetic drum, is installed on the said fixing member; This ground brush and above-mentioned revolution magnetic drum Elastic Contact simultaneously, on the said fixing member of the back side of above-mentioned ground brush one side, form than the little through hole of above-mentioned ground brush shape.
2. returning head device as claimed in claim 1 is characterized by, and on above-mentioned revolution magnetic drum parts of bearings is arranged, and it constitutes the part of this revolution magnetic drum, and rotatably support above-mentioned bolster; On position relative on the said fixing member with above-mentioned parts of bearings, make the holding portion of given depth, above-mentioned through hole is set continuously, so that ground brush and give the afterburning member of this ground brush elastic stressing is placed in the above-mentioned holding portion on this holding portion.
3. returning head device as claimed in claim 2 is characterized by, and on the said fixing member, forms protuberance in a side relative with the axial above-mentioned revolution magnetic drum of above-mentioned supporting; Utilize this protuberance can between above-mentioned revolution magnetic drum and said fixing member, form given gap.
4. returning head device as claimed in claim 3 is characterized by, and above-mentioned parts of bearings is made up of the ball bearing with outer ring and inner ring, and this outer ring constitutes the part of above-mentioned revolution magnetic drum, and inner ring is axial location on above-mentioned bolster then; The inner ring contacts side surfaces of the protuberance of said fixing member and this ball bearing, the outer ring Elastic Contact of above-mentioned ground brush and above-mentioned ball bearing is when rotating above-mentioned revolution magnetic drum, when also rotate above-mentioned outer ring, the side of this outer ring then with above-mentioned ground brush Elastic Contact, and slide thereon.
5. a returning head device is characterized by, and it has the revolution magnetic drum that has magnetic head; Be fixed on this revolution magnetic drum, with turning round the bolster that magnetic drum rotates; Rotatably support the fixedly magnetic drum of this bolster; Fixedly magnetic drum is relative disposes with this, is fixed on the above-mentioned bolster rotary revolving member; With the ground brush that is installed in a side relative on the above-mentioned revolving member with the said fixing magnetic drum; This ground brush and said fixing magnetic drum Elastic Contact simultaneously, on the above-mentioned revolving member of the back side of above-mentioned ground brush one side, form than the little through hole of above-mentioned ground brush shape.
6. returning head device as claimed in claim 5 is characterized by, and on the said fixing magnetic drum parts of bearings is arranged, and it constitutes this fixedly part of magnetic drum, and rotatably support above-mentioned bolster; On the position relative, make the holding portion of given depth with the above-mentioned parts of bearings of above-mentioned revolving member; Above-mentioned through hole is set continuously, so that above-mentioned ground brush and give the afterburning member of this ground brush elastic stressing is placed in this holding portion on this holding portion.
7. returning head device as claimed in claim 6, it is characterized by, on above-mentioned revolving member, form protuberance in a side relative with the axial said fixing magnetic drum of above-mentioned supporting, utilize this protuberance can between said fixing magnetic drum and above-mentioned revolving member, form given gap.
8. returning head device as claimed in claim 7 is characterized by, and above-mentioned parts of bearings is made up of the ball bearing with outer ring and inner ring, and the outer ring constitutes the part of said fixing magnetic drum, and inner ring is axial location on rotary above-mentioned bolster; The inner ring contacts side surfaces of the protuberance of above-mentioned revolving member and above-mentioned ball bearing, the outer ring Elastic Contact of above-mentioned ground brush and above-mentioned ball bearing, when above-mentioned revolving member rotates, above-mentioned ground brush and above-mentioned outer ring Elastic Contact, and slide thereon.
9. the assembly method of a returning head device, it is a kind of fixedly magnetic drum that has; Be fixed on this fixedly bolster on the magnetic drum; Be rotatably supported on this bolster, have the revolution magnetic drum of magnetic head; Be configured to the state relative, be fixed on the fixed component on the above-mentioned bolster with this revolution magnetic drum; Be installed in the assembly method of the returning head device of the ground brush on the relative side with above-mentioned revolution magnetic drum of this fixed component, it is characterized by, on the said fixing member, make the holding portion of placing this ground brush, and on the said fixing member of the back side one side of the above-mentioned ground brush in being placed on above-mentioned holding portion, make than the little through hole of above-mentioned ground brush shape; The above-mentioned ground brush that utilizes assembling jig to prevent to be placed on the above-mentioned holding portion comes off, and simultaneously, will detect pin and insert in the above-mentioned through hole, detects to have or not above-mentioned ground brush.
10. the assembly method of returning head device as claimed in claim 9, it is characterized by, insert the above-mentioned detection pin in the above-mentioned through hole, can be according to having or not above-mentioned ground brush to move in the above-mentioned holding portion, the mobile detection means that makes of this detection pin is moved, and can detect to have or not above-mentioned ground brush.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07024998A JP3569437B2 (en) | 1998-03-19 | 1998-03-19 | Method of assembling rotary head device |
| JP070249/1998 | 1998-03-19 | ||
| JP070249/98 | 1998-03-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1229982A true CN1229982A (en) | 1999-09-29 |
| CN1120474C CN1120474C (en) | 2003-09-03 |
Family
ID=13426108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99103394A Expired - Fee Related CN1120474C (en) | 1998-03-19 | 1999-03-17 | Returning head device and its mounting method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3569437B2 (en) |
| KR (1) | KR100321502B1 (en) |
| CN (1) | CN1120474C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102737666A (en) * | 2011-04-08 | 2012-10-17 | 东芝三星存储技术韩国株式会社 | Ground unit and disk drive having same |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100605167B1 (en) * | 1999-07-22 | 2006-07-28 | 삼성전자주식회사 | Strucrure for earthing of head drum |
| KR20050051858A (en) * | 2003-11-28 | 2005-06-02 | 삼성전자주식회사 | Head drum assembly of a tape recorder and method for assembling the same |
| KR20060000015A (en) * | 2004-06-28 | 2006-01-06 | 삼성전자주식회사 | Assembling method of head drum assembly of magnetic recording/reproducing apparatus |
| KR20060000017A (en) * | 2004-06-28 | 2006-01-06 | 삼성전자주식회사 | A head drum assembly and a magnetic recording/reading device having the same and a method for assembling the head drum assembly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05101482A (en) * | 1991-10-04 | 1993-04-23 | Matsushita Electric Ind Co Ltd | Rotary head drum |
-
1998
- 1998-03-19 JP JP07024998A patent/JP3569437B2/en not_active Expired - Lifetime
-
1999
- 1999-03-17 KR KR1019990008992A patent/KR100321502B1/en not_active IP Right Cessation
- 1999-03-17 CN CN99103394A patent/CN1120474C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102737666A (en) * | 2011-04-08 | 2012-10-17 | 东芝三星存储技术韩国株式会社 | Ground unit and disk drive having same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11273039A (en) | 1999-10-08 |
| CN1120474C (en) | 2003-09-03 |
| KR100321502B1 (en) | 2002-01-23 |
| KR19990077975A (en) | 1999-10-25 |
| JP3569437B2 (en) | 2004-09-22 |
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| C10 | Entry into substantive examination | ||
| 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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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030903 Termination date: 20110317 |