Abstract:
The present invention is directed to a fluid agent applying multi-vent nozzle capable of densely disposing ejecting vents, and the multi-vent nozzle comprises a main body configured in a casing block, a raised surface provided at a distal end of the casing block, and contoured and dimensioned corresponding to a target area to apply fluid agent to, and a plurality of ejecting vents defined in the raised surface.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a fluid agent applying multi-vent nozzle, and more particularly, to a multi-vent nozzle suitable for applying adhesive fluid agent to minute parts such as miniaturized components of a magnetic head suspension for a hard disk drive (HDD). 
       BACKGROUND ART 
       [0002]    Magnetic head suspensions used for HDDs are typically comprised of a base plate attached to a supporting shaft such as a carriage arm, and a load beam extending outward from the base plate. The supporting shaft is controlled by an actuator with a voice coil motor (VCM), and this enables a magnetic head attached to a distal end of the load beam via a flexure to be controllably positioned in the seek direction. Some state-of-the-art hyper-storage density HDDs, in order to cope with uncontrollability in precisely positioning their magnetic heads merely with the aid of the aforementioned actuator driving the supporting shaft, employ a dual-stage actuating style where a micro-motion control actuator is added in position between the base plate and the load beam so as to force the load beam to pivot in the seek direction. 
         [0003]    In general, adhesive fluid agent is used to attach various components such as the micro-motion control actuator to the magnetic head suspension. The fluid agent is either electrically insulating or conducting and is usually discharged from a nozzle at the tip of a syringe loaded with the fluid agent and pneumatically pressurized (or mechanically pressurized by a piston or the like) so as to apply the fluid agent to the targeted area in a work piece. The typical of such a nozzle include the one as illustrated in  FIG. 11A , and a nozzle  10  has its upper end inlet  10   a  coupled with an outlet of the syringe that is held by a robot and moved along with the nozzle  10  toward the predetermined target area prior to discharging the fluid agent from a nozzle tip  10   b  to deposit a spot(s) of the fluid agent. Otherwise, as depicted in  FIG. 11B , a line of the fluid agent may be drawn by the nozzle tip  10   b  moved by the robot. 
         [0004]    The nozzle  10  in  FIG. 11A  is a single-vent nozzle with one ejection conduit provided in the nozzle tip  10   b,  and when the target area is in more than one locations or when it occupies one large range, a multi-vent nozzle  20  as depicted in  FIG. 12A  may be substituted in order to save time spent for applying the fluid agent. The multi-vent nozzle  20  has its inlet unit  20   a  as an incoming fluid agent intake configured with a single channel and its casing block  20   c  as an outgoing fluid agent exit configured with multi channels divided from the single channel, and the fluid agent is discharged all at a time from cylindrical ejecting conduits  20   b  at distal ends of the channels. Such a multi-vent nozzle with ejecting conduits together formed in a single block are disclosed in  FIG. 4  attached to Patent Document 1 (Official Gazette of Preliminary Publication of Unexamined Patent Application No. H11-300257). 
       Citation List 
       [0005]    Patent document 1: JP-A-11-300257 
       SUMMARY OF INVENTION 
     Technical Problem 
       [0006]    If it is desired to spread only a minute amount of the fluid agent in a relatively large range with the multi-vent nozzle, the nozzle must have many vents at very small pitches. However, the cylindrical ejecting vents should have a critical thickness, and the current machining technology necessitates a critical interval between the vents adjacent to each other. Hence, in order to manufacture the multi-vent nozzle  20  as in  FIG. 12A , the pitch between the ejecting vents cannot be indefinitely small. Thus, as can be seen in  FIG. 12B , if an insufficient amount of the fluid agent  30  is applied, droplets of the fluid agent  30  stay like isolated islands; and meanwhile, as shown in  FIG. 12C , if an excessive amount of the fluid agent  30  is applied, the ejected substance is heaped up too much, which is disadvantageous in that the fluid agent  30  is used more than actually needed, and the resultant bonding performance is degraded. Additional problem is that the ejecting vents are so fine and are prone to break or deform. 
         [0007]    The present invention is made to overcome the aforementioned problems with the prior art, and it is an object of the present invention is to provide a multi-vent fluid agent applying nozzle with ejecting vents densely disposed. 
       Solution to Problem 
       [0008]    In order to solve the aforementioned problems in the prior art, the present invention provides a fluid agent applying multi-vent nozzle comprising a raised surface that is provided at a distal end of a casing block, and shaped and dimensioned corresponding to a target area to apply the fluid agent to, and a plurality of ejecting vents defined in the raised surface for discharging the fluid agent. 
         [0009]    The raised surface may be a belt-shaped raised surface, and elongate vents may be defined along the belt-shaped raised surface so as to discharge the fluid agent through the vents. 
         [0010]    The raised surface may be a rectangular-ring-shaped raised surface, and elongate vents may be defined along the rectangular-ring-shaped raised surface so as to discharge the fluid agent through the vents, as well as one or more vents defined in the distal end of the casing block behind the rectangular-ring-shaped raised surface so as to discharge the fluid agent. 
         [0011]    In another aspect of the present invention, a raised portion is provided at a distal end of a casing block, and contoured and dimensioned corresponding to edge portions of a hole or a notch that is a target area to apply fluid agent to, and a plurality of vents may be defined along a proximal end of the raised portion so as to discharge the fluid agent. In this case, the plurality of the vents along the proximal end of the raised portion may be replaced with elongate vents to supply with the fluid agent. In addition, an outer sidewall of the raised portion may have grooves in fluid communication with the plurality of the vents or the elongate vents and extending along a rising extension of the raised portion. 
         [0012]    The present invention also provides a multi-vent nozzle comprising a raised portion provided at a distal end of a casing block, and contoured and dimensioned corresponding to edge portions of a hole or a notch that is defined in a base plate, an actuator device for controlling a load beam of a magnetic head suspension for supporting a magnetic head being fitted in the hole or the notch, and a plurality of vents or elongate vents defined along a proximal end of the raised portion so as to discharge fluid agent. An outer sidewall of the raised portion may have grooves in fluid communication with the plurality of the vents or the elongate vents and extending along a rising extension of the raised portion. 
         [0013]    The present invention provides a fluid agent applying multi-vent nozzle for applying fluid agent to an assembly of a base plate and a load beam of a magnetic head suspension for supporting a magnetic head, the multi-vent nozzle comprising
       a main body configured in a casing block,   a raised portion provided at a distal end of the casing block, and contoured and dimensioned corresponding to edge portions of a hole or a notch defined in the base plate, an actuator device for controlling the load beam being fitted in the hole or the notch,   a plurality of first vents or elongate vents defined along a proximal end of the raised portion for discharging fluid agent, and   second vents defined at the distal end of the casing block for applying the fluid agent to the load beam.       
 
         [0018]    An outer sidewall has grooves in fluid communication with the plurality of the vents or the elongate vents and extending along a rising extension of the raised portion. 
         [0019]    In accordance with the present invention, since the raised surface is defined in the distal end of the casing block, and contoured and dimensioned corresponding to a target area to apply the fluid agent to, and the plurality of the ejecting vents are defined in the raised surface to discharge the fluid agent, unlike a prior art multi-vent nozzle with a plurality of cylindrical ejecting conduits disposed therein, there is no need of allowing for a thickness of the ejecting conduits and a minimal interval between them, and reducing a diameter of the vents as much as possible brings about a fluid agent applying multi-vent nozzle with ejecting vents densely disposed. The multi-vent nozzle according to the present invention is advantageous because of its reduced fragileness of breaking and/or deforming, in contrast with the prior art multi-vent nozzles. Additionally, the raised surface provided with the ejecting vents defines an area where the fluid agent is to be applied, and hence, the fluid agent can be applied to a target in precise positions and range. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]      FIG. 1A  is a perspective view illustrating a first embodiment of a multi-vent nozzle in accordance with the present invention; 
           [0021]      FIG. 1B  is a partial sectional view illustrating the first embodiment of the multi-vent nozzle in accordance with the present invention; 
           [0022]      FIG. 2  is a perspective view illustrating a second embodiment of the multi-vent nozzle in accordance with the present invention; 
           [0023]      FIG. 3  is a perspective view illustrating a third embodiment of the multi-vent nozzle in accordance with the present invention; 
           [0024]      FIG. 4A  is a perspective view illustrating a fourth embodiment of the multi-vent nozzle in accordance with the present invention; 
           [0025]      FIG. 4B  is a bottom view of a varied version of the multi-vent nozzle in  FIG. 4A ; 
           [0026]      FIG. 4C  is a bottom view of another variation of the multi-vent nozzle; 
           [0027]      FIG. 5  is a perspective view illustrating a magnetic head suspension; 
           [0028]      FIG. 6  is a perspective view illustrating a syringe, the multi-vent nozzle, and the magnetic head suspension; 
           [0029]      FIG. 7A  is a perspective bottom view of a casing block; 
           [0030]      FIG. 7B  is a perspective bottom view of a varied version of the casing block in  FIG. 7A ; 
           [0031]      FIG. 8A  is a side view of the multi-vent nozzle coming close to an assembly of a base plate and a load beam; 
           [0032]      FIG. 8B  is a perspective view showing fluid agent applied to the base plate of the magnetic head suspension; 
           [0033]      FIG. 9  is a perspective view of a micro-motion control actuator fitted in the base plate; 
           [0034]      FIG. 10  is a perspective view of the micro-motion control actuator fitted in the base plate; 
           [0035]      FIG. 11A  is a perspective view of a prior art nozzle; 
           [0036]      FIG. 11B  is a side view of a line is drawn with the fluid agent discharged from the prior art nozzle; 
           [0037]      FIG. 12A  is a perspective view of a prior art multi-vent nozzle; 
           [0038]      FIG. 12B  is a side view of the prior art multi-vent nozzle applying the fluid agent; and 
           [0039]      FIG. 12C  is a side view of the prior art multi-vent nozzle applying the fluid agent. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiment 1 
       [0040]    The present invention will now be described in the context of four preferred embodiments with reference to the accompanying drawings.  FIG. 1A  depicts a first embodiment of a multi-vent nozzle  50 , which has a hollow cubic casing block  50   c.  In the center of an upper side of the casing block  50   c , a cylindrical inlet unit  50   a  is provided so as to be coupled with an ejecting outlet of a syringe (not shown). The inlet unit  50   a  is in fluid communication with a hollow space within the casing block  50   c.  In the center of a bottom side of the casing block  50   c,  a rectangular-ring-shaped raised portion  52  is formed. Dimensions and shape of the raised portion  52  are customized depending on the dimensions and shape of a target area in a work piece to apply the fluid agent to. The raised portion  52  has a rectangular end surface  52   a  in and along which, as shown in  FIG. 1B , a plurality of ejecting vents  54  are equidistantly disposed so as to be in fluid communication with the hollow space within the casing block  50   c.    
         [0041]    The ejection vents  54  can be formed by any of the well-known machining arts such as drilling, electrical discharging, laser emission, and the like. The number and dimensions of the vents  54  are variable depending upon factors such as an amount of the fluid agent to apply. In the illustrated embodiment, there are six of the vents  54  in each side of the rectangular end surface of the raised portion. The vents  54  may have a diameter ranging from 0.03 to 0.1 mm. Although the prior art nozzle have its cylindrical multi vents downsized to its minimum limit of inner diameter as small as 0.15 mm, the present invention facilitates to machine the nozzle so as to have the vents of 0.1 mm or even smaller in diameter. 
         [0042]    The casing block  50   c  may be made of any material that is selected as the optimum depending upon a diameter of the machined nozzle vents and a type of the fluid agent to apply. Metals suitable include cemented carbide, dies steel, high-speed tool steel, stainless steel, copper, and the like. Non-metal materials such as ceramics and ruby may also be used. When the fluid agent is corrosive, stainless steel is suitable, and when heat transfer rate is of interest, copper is the appropriate one. If suppressing heat distortion or any other deformation is a matter of utmost concern, ruby is useful for that purpose, and in the event that heat resistance is a critical matter, ceramics may be user&#39;s choice. For the purpose of enhancing rust-proof or anticorrosion property, or in order to improve non-cohesiveness, the casing block may be coated if desired. For instance, it may undergo DLC coating to decrease coefficient of friction or may be coated with fluorocarbon polymers to improve non-cohesiveness. 
         [0043]    The multi-vent nozzle  50  in  FIG. 1A  is used in a manner described as follows. First, a syringe with an attachment of the multi-vent nozzle  50  is fixed to a robot arm. The robot arm is operated to move the multi-vent nozzle  50  to a proximal position to a work piece W onto which the fluid agent is to be applied, as shown in  FIG. 1B . Then, the multi-vent nozzle  50  has its raised portion faced to the work piece W so that an end surface of the raised portion is in parallel to the target area in the work piece W with a predetermined clearance C therebetween. The clearance C depends upon an amount of the fluid agent to apply; that is, as the amount (a height of a deposit) is increased (greater in profile), the clearance C is to be wider while as the amount (the height of the deposit) is reduced (smaller in profile), the clearance C is to be narrower. A predetermined amount of the fluid agent ejected from each vent in this manner spreads uniformly in the clearance C, and the fluid agent discharged creates a rectangular ring  56  of a predetermined thickness. 
       Embodiment 2 
       [0044]      FIG. 2  illustrates a second embodiment of the multi-vent nozzle denoted by reference numeral  60 . A casing block  60   c  and an inlet unit  60   a  are configured relative to each other in the same manner as their counterparts are in  FIG. 1 . In the center of a lower side of the casing block  60   c  of the multi-vent nozzle  60 , a rectangular-ring-shaped raised portion  62  is formed. Dimensions and shape of the raised portion  62  is customized depending upon the dimensions and shape of a target area in a work piece to apply the fluid agent to. A rectangular end surface  62   a  of the raised portion  62  is provided with a pair of elongate ejecting vents  64   a  and  64   b . The elongate ejecting vents  64   a  and  64   b  have their respective one ends connected with communicating vessels  66   a  and  66   b  leading to a hollow space within the casing block  60   c.  The elongate ejecting vents  64   a  and  64   b,  and the communicating vessels  66   a  and  66   b  are formed by any of the well-known machining arts such as drilling, electrical discharging, laser emission, and the like. The elongated ejecting vents may have a width ranging from 0.03 to 0.1 mm. 
         [0045]    The multi-vent nozzle  60  in  FIG. 2  may be used in the same manner as depicted in  FIG. 1 . When a predetermined amount of the fluid agent is supplied through the communicating vessels  66   a  and  66   b,  the fluid agent thoroughly fills the elongate ejecting vents  64   a  and  64   b  and then pours out of the vents  64   a  and  64   b  down on the target area in the work piece till a predetermined height of a deposit stickily lies in shape of a pair of square brackets  68   a  and  68   b.  Although the prior art nozzles often encounter choking on the fluid agent containing electrically conductive micro-particles of substances such as silver, the elongate ejecting vents  64   a  and  64   b  eliminate the problem with applying such a suspension agent by the nozzle. 
       Embodiment 3 
       [0046]      FIG. 3  illustrates a third embodiment of the multi-vent nozzle denoted by a reference numeral  80 . A casing block  80   c  and an inlet unit  80   a  are configured relative to each other in the same manner as their counterparts are in  FIG. 1 . In the center of a lower side of the casing block  80   c  of the multi-vent nozzle  80 , a rectangular raised portion  82  is formed. In the periphery of a distal end surface  82   a  of the raised portion  82 , a pair of elongate ejection vents  84   a  and  84   b  are defined in shape of square brackets and have their respective one ends connected with communicating vessels  86   a  and  86   b  as in  FIG. 2 . In the center of the distal end surface  82   a,  there is a relatively large first ejecting orifice  87  accompanied with relatively small second ejecting orifices  88  on the opposite sides. The ejecting orifices  87  and  88  are in fluid communication with a hollow space within the casing block  80   c . The elongate ejecting vents  84   a  and  84   b,  the communicating vessels  86   a  and  86   b,  and the ejecting orifices  87  and  88  may be formed by any of the well-known machining arts such as drilling, electrical discharging, laser emission, and the like. The elongate ejecting vents  84   a  and  84   b,  and the ejecting orifices  87  and  88  may have a width ranging from 0.03 to 0.1 mm. 
         [0047]    The multi-vent nozzle  80  in  FIG. 3  may be used in the same manner as depicted in  FIG. 1 . When a predetermined amount of the fluid agent is supplied through the communicating vessels  86   a  and  86   b,  the fluid agent thoroughly fills the elongate ejecting vents  84   a  and  84   b  and then pours out of the vents  84   a  and  84   b  down on the target area in the work piece till a predetermined height of a deposit stickily lies in shape of a pair of square brackets  90   a  and  90   b.  The fluid agent poured out of the first and second ejecting orifices  87  and  88  are deposited in shape of spots  91  and  92 . 
       Embodiment 4 
       [0048]      FIG. 4A  illustrates a fourth embodiment of the multi-vent nozzle denoted by a reference numeral  100 . A casing block  100   c  and an inlet unit  100   a  are configured relative to each other in the same manner as their counterparts are in  FIG. 1 . In the center of a lower side of the casing block  100   c  of the multi-vent nozzle  100 , a rectangular-ring-shaped raised portion  102  is formed. In the periphery of a proximal end of the raised portion  102 , a plurality of ejection vents  104  leading to a hollow space within the casing block  100   c  are disposed equidistantly. The ejecting vents  104  maybe formed by any of the well-known machining arts such as drilling, electrical discharging, laser emission, and the like. The ejecting vents  104  may have a width ranging from 0.03 to 0.1 mm. Outer side wall of the raised portion  102 , which rises corresponding to a vertical extension of the raised portion  102 , has grooves  106  with a semicircular cross-section vertically extending up to and in fluid communication with the ejecting vents  104 . 
         [0049]    The multi-vent nozzle  100  in  FIG. 4A  may also be used basically in the same manner as in  FIG. 1 . One exception is that the target area to apply the fluid agent to is in or around edges of holes or notches defined in the work piece. Specifically, as shown in  FIG. 4A , the work piece, namely, a plate work piece  108  in this embodiment has an aperture  108   a  shaped similarly to but dimensioned slightly larger than the raised portion  102 , and edges of the aperture  108   a  is a target area to apply the fluid agent to. A robot arm is operated to force the raised portion  102  of the multi-vent nozzle  100  to come down and fit in the aperture  108   a  so that the distal end surface of the casing block  100   c  is spaced apart from the plate work piece  108  by a predetermined distance while similarly there remains a predetermined clearance in the aperture  108   a  defined by the side wall of the raised portion  102 . In such conditions, discharging a predetermined amount of the fluid agent from all the ejecting vents  104  permits the fluid agent to lie in a deposit  110   a  over the edges of the plate work piece and also permits the fluid agent to thoroughly fill the grooves  106  and spread into the clearance defined in the aperture  108   a  to leave a deposit  110   b.  Thus, in the fourth embodiment of the present invention, a single stroke or a single shot of the fluid agent achieves a three-dimensional application of the fluid agent. 
         [0050]    Alternatives to this embodiment include multi-vent nozzles  110  and  120  as shown in  FIGS. 4B and 4C . The multi-vent nozzle  110  in  FIG. 4B  has a raised portion  102  and L-shaped elongate vents  112   a  and  112   b  defined along a proximal end of the raised portion. In the middle of the elongate vents  112   a  and  112   b  and around corners of the raised portion  102 , communicating vessels  114   a  and  114   b  leading to a hollow space within the casing block are defined. An outer side wall that rises corresponding to a vertical extension of the raised portion  112  has no grooves like the grooves  106  depicted in  FIG. 4A , and since the raised portion leaves a clearance appropriately in an aperture  108   a  of the work piece, the fluid agent discharged through the elongate vents  112   a  and  112   b  can spread uniformly in the clearance. 
         [0051]    A multi-vent nozzle  120  in  FIG. 4C  has L-shaped elongate vents  122   a  and  122   b  extending along a proximal end of a raised portion  122 . In the middle of the elongate vents  122   a  and  122   b  and around corners of the raised portion  122 , communicating vessels  124   a  and  124   b  leading to a hollow space within the casing block are formed. An outer side wall, which rises corresponding to a vertical extension of the raised portion  122 , has grooves  126  with a semicircular cross-section vertically extending up to and in fluid communication with the elongate vents  122   a  and  122   b.  In this embodiment, similar to that in  FIG. 4A , the fluid agent can be laid in deposits  110   a  and  110   b.    
         [0052]    The multi-vent nozzle of the present invention and its applications will now be detailed.  FIG. 5  illustrates a magnetic head suspension  130  comprised of a base plate  132  and a load beam  134 . The base plate  132  has a hole  132   a  through which a support shaft such as a carriage arm is attached, and a hole  132   b  in which a micro-motion actuator (charge-coupled device) is fitted to force the load beam to pivot in the seek direction. The micro-motion actuator is adhesively fixed by the fluid agent deposited at front and rear edges around the hole  132   b.    
         [0053]      FIG. 6  shows a syringe  141  and a casing block  140  attached thereto for applying the fluid agent to adhesively fix the micro-motion actuator. A distal end surface of the casing block  140  is provided with multi ejecting vents  142  similar to those shown in  FIG. 4A . As will be recognized in detail in  FIG. 7A , in the center of the distal end surface of the casing block  140 , provided is a raised portion  144  which is contoured similar to the hole  132   b  and dimensioned slightly smaller than the hole  132   b.  A thickness (an extent of rising) of the raised portion  144  is almost the same as that of the base plate  132  or slightly greater. Along the front and rear side of the proximal end of the raised portion  144 , a plurality of first ejecting vents  146  are defined. An outer wall, which rises corresponding to a vertical extension of the raised portion  144 , has grooves  147  with semicircular cross-section vertically extending up to and in fluid communication with the first ejecting vents  146 . In addition, in the distal end surface  144   a  on the bottom side of the raised portion  144 , triplets of second ejecting vents  148   a  to  148   c  are aligned on the opposite lateral sides. 
         [0054]    Alternative to this is a multi-vent nozzle  150  shown in  FIG. 7B . The multi-vent nozzle  150  is unique in that the first ejecting vents  146  in the previous embodiment are replaced with elongate vents  152 , and some of the elongate vents  152  have their respective ports in fluid communication with a hollow space within the casing block. 
         [0055]    The multi-vent nozzle  142  may be used in a manner described as follows. A robot arm is operated to move the casing block  140  to a position above the base plate  132 , as shown in  FIG. 8A , and while the raised portion  144  keeps its position right above the hole  132   b,  the casing block  140  is lowered. As the casing block  140  comes down and eventually causes the raised portion  144  to have its bottom surface or distal end surface  144   a  spaced from the upper side of the load beam  134  by a predetermined distance and to be in a face-to-face position parallel with each other, the robot arm stops. In such a state, the raised portion  144  is fitted in the hole  132  with a predetermined clearance, and another clearance is also left between the bottom surface of the casing block  140  and the upper surface of the base plate  132 . In this condition, discharging the fluid agent (electrically insulating fluid agent) from all the first ejecting vents  146  permits the fluid agent poured in the grooves  147  of the raised portion  144  to spread uniformly in the clearance defined in the hole  132   b,  thereby leaving deposits  160   a  and  160   b  of the fluid agent in position, as shown in  FIG. 8A . In addition, the fluid agent discharged from the second ejecting vents  148   a  to  148   c  defined in the raised portion  144   a  is deposited in shape of spots  162   a  to  162   c.  Deposits denoted by reference numerals  164  and  166  in  FIG. 8B  are electrically conductive fluid agent applied to the upper surface of the load beam by the prior art single-vent nozzle (the spots  162   a  to  162   c  as in  FIG. 8A  are omitted). 
         [0056]    Then, the robot arm is operated to raise the casing block  140 , and instead, a pair of micro-motion actuators  170   a  and  170   b  shaped in rectangular thin plate are fitted in the hole  132   b,  as shown in  FIG. 9 . In this way, the micro-motion actuators  170   a  and  170   b,  bridging the hole  132   b,  have their respective front and rear ends fixed to the base plate  132  by the deposits  160   a  and  160   b  of the fluid agent, and the micro-motion actuators  170   a  and  170   b  have their respective lower major surfaces fixed to the upper surface of the load beam  134  by virtue of the spotted heaps  162   a  to  162   c  of the fluid agent and the deposits  164  and  166  of the electrically conductive fluid agent. Finally, as can be seen in  FIG. 10 , the prior art single-vent nozzle is used to apply the electrically conductive fluid agent  172   a  and  172   b  between the front ends of the upper major surface of the micro-motion actuators  170   a  and  170   b  and the base plate  132 . 
         [0057]    With the multi-vent nozzle  142  of the present invention used in the aforementioned manner, the deposits  160   a  and  160   b  over the edge portions of the hole  132   b  and the deposits  162   a  to  162   c  on the upper major surface of the load beam  134  can be applied at one time. In the prior art method, application to the base plate  132  and to the load beam is conducted in separate processes, but the multi-vent nozzle  142  of the present invention enables the fluid agent to be applied at a time to both the base plate  132  and the load beam  134 . 
         [0058]    The present invention is advantageous not only in view of saving time spent for applying the fluid agent but also in that the base plate  132  and the load beam  134  can have the fluid agent in significantly precise relative positions without errors. In other words, since the prior art method employs separate processes for applying the fluid agent to the base plate  132  and the load beam  134 , respectively, and necessitates to transfer work pieces from one process to another, an error in positioning the work pieces thus transferred is likely to be a cause of a next error in applying the fluid agent in the desired relative positions on the work pieces, but the multi-vent nozzle  142  of the present invention, which is useful to omit the stage of transferring the work pieces between the separate fluid agent application processes, eliminates latency of such an error in positioning the work pieces, so that the relative positions of the fluid agent applied are determined in one steady way as prescribed in the specifications of the multi-vent nozzle  142 . 
       INDUSTRIAL APPLICABILITY 
       [0059]    Multi-vent nozzles for applying fluid agents according to the present invention are applicable to a wide range of industrial fields as well as the assembling process of components of a magnetic head suspension.