JP4032564B2 - Manufacturing method of resin case and push-on switch configured using resin case manufactured thereby - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention is a small and thin push-on switch used for signal input of various electronic devices.Manufacturing method of resin case and push-on switch configured using resin case manufactured therebyIt is about.
[0002]
[Prior art]
  In recent years, as electronic devices have become smaller and lighter, electronic components used in these devices are strongly demanded to be smaller and thinner, and low-profile and thin surface-mount type electronic components are used. A lot is happening.
[0003]
  Among these electronic components, in electronic components that use resin cases with contacts such as switches, the resin case has contacts formed integrally with the terminals fixed to the inner bottom surface by insert molding to reduce the size. Is often used.
[0004]
  And since the back side of the contact is exposed on the bottom of the bottom of the resin case where the contact is fixed to the inner bottom by such an insert molding process, the back of the contact is exposed to the product pressing part for positioning the contact during the molding process. When mounting the bottom of the resin case on the wiring board of the electronic device for soldering to the electronic device, the solder flux penetrates into the contact portion in the resin case from the trace of this product holding part, and the contact failure is caused. It can be a cause.
[0005]
  For this reason, a manufacturing apparatus as described in “Instrument product manufacturing apparatus” disclosed in Japanese Patent Publication No. 2-54770 is used, and the configuration of the insert molded part manufacturing apparatus shown in FIGS. The operation will be described with reference to cross-sectional views.
[0006]
  FIG. 17 shows a state before molding in which the upper mold 1 and the lower mold 2 of the molding die are opened.
[0007]
  In the figure, the upper die 1 is disposed so as to be openable and closable with respect to the lower die 2, and a movable insert product pressing pin 4 with a spring is disposed at the center of the molding cavity 1 </ b> A of the upper die 1 so as to protrude by a spring 6. On the upper surface of the upper mold 1, a pressing weight 7 that contacts the head of the movable insert product holding pin 4 with a spring is disposed.
[0008]
  The pressing weight 7 is coupled to the upper end of a return pin 8 assembled so as to penetrate the upper mold 1 vertically, and a spring 9 is provided on the upper surface of the pressing weight 7 to urge the pressing weight 7 downward. A spacer 10 is provided on the side of the pressing weight 7 to ensure the amount of movement.
[0009]
  In such a configuration, as shown in FIG. 18, the insert 3 is set in the molding cavity 2A of the lower mold 2, the upper mold 1 and the lower mold 2 are closed, and the insert with the movable insert presser pin 4 with a spring is inserted. The product 3 is pressed against the lower mold 2 and fixed.
[0010]
  At this time, since the lower end of the return pin 8 hits the lower mold 2 and cannot be moved downward, the pressing weight 7 moves upward without following the downward movement of the upper mold 1. The upper end is in a free state.
[0011]
  Thereafter, as shown in FIG. 19, the molding resin 1 is filled into the molding cavities 1A and 2A of the upper mold 1 and the lower mold 2 at a higher pressure than the molding machine, and the movable insert product holding pin 4 with the spring is pressed by the resin pressure. The upper mold 1 is pushed out against the elastic force of the spring 6, and the gap formed between the insert 3 and the tip of the spring-equipped movable insert retainer 4 is filled with molten resin.
[0012]
  Then, after the molten resin is cooled and solidified, as shown in FIG. 20, the upper mold 1 and the lower mold 2 are opened to take out the insert molded part 11, and the movable insert with a spring is pressed by the pressing weight 7 by using the opening and closing of the apparatus. By pressing the product presser pin 4 downward, the movable insert product presser pin 4 with spring is returned to its original position.
[0013]
  In this way, even if the trace of the movable insert product holding pin 4 with a spring that is a product holding portion remains as a depression on the upper mold 1 side of the insert molded part 11, the insert product 3 is not exposed to this portion. The insert molded part 11 can be obtained.
[0014]
  By using such a manufacturing apparatus, the resin case with contacts of electronic parts such as switches can be inserted into the insert product 3 on the trace of the movable insert product presser pin 4 with a spring which is the product presser part on the outside of the bottom surface. As the insert molded part 11 in which the contact is not exposed.
[0015]
[Problems to be solved by the invention]
  However, in order to insert-mold a resin case with contacts of electronic parts such as switches using the manufacturing apparatus as described above, the outside of the contact on the bottom surface of the resin case, that is, the insert 3 of the insert-molded part 11 A movable insert product pressing pin 4 with a spring as a product pressing portion moves to the resin portion on the upper mold 1 side which is outside, and a predetermined dimension for filling the molten resin into the gap between the insert product 3 generated thereby is provided. Although it is necessary, the resin case for electronic parts such as low profile and thin switches in recent years also has a thin bottom surface, and it is difficult to secure this predetermined dimension on the resin part outside the contact was there.
[0016]
  The present invention solves such a conventional problem, and a product outside the bottom surface for positioning the contact when the contact is fixed to the inner bottom surface of the resin case with a thin bottom surface by insert molding processing. The back side of the contact is not exposed at the foot of the presser footManufacturing method of resin case and push-on switch configured using resin case manufactured therebyThe purpose is to provide.
[0017]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides:Preparing a first bent portion embedded at the time of the first insert molding process, a second bent portion embedded at the time of the second insert molding process, and a contact member made of a metal material integrally having a terminal;Between the first and second product presser portions provided at the corresponding positions of the upper mold and the lower mold of the mold,the aboveUsing a predetermined resin, sandwich the part that will be the contact point of the contact member made of metal materialSo as to embed the first bent partFirst insert molding processGoingA flat contact board with contacts exposed on the upper surface is formed, then this contact board is sandwiched between molding dies, and the second insert molding process is performed using the same resin as the primary insert molding process. A contact wall is exposed on the bottom surface to form a peripheral wall on the periphery of the contact substrate, and the above resin is filled in the bottom surface including the depression by the product pressing portion outside the bottom surface during the primary insert molding process.And bury the second bent part in the bottom of the resin caseTo do.
[0018]
  As a result, when the contact is fixed to the inner bottom surface of the resin case with a thin bottom surface by insert molding, the back surface of the contact is not exposed to the trace of the product pressing portion outside the bottom surface for positioning the contact.Manufacturing method of resin case and push-on switch configured using resin case manufactured therebyCan be obtained.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
  The invention described in claim 1 of the present inventionPreparing a first bent portion embedded at the time of the first insert molding process, a second bent portion embedded at the time of the second insert molding process, and a contact member made of a metal material integrally having a terminal;Between the first product presser part provided in the upper mold of the molding die and the second product presser part provided in the corresponding position of the lower mold,the aboveThe contact surface of the metal material contact member and the opposite surface are sandwiched, and the primary insert molding process is performed using a predetermined resin. The contact is exposed at least on the upper or lower surface, and the terminal protrudes on the outer periphery.In addition, the first bent portion is embedded and the metal material contact member is fixed.A flat contact board is formed, and then this contact board is sandwiched between the upper mold and the lower mold of the molding die, and the second insert molding process is performed using the same resin as the first insert molding process described above. A peripheral wall is formed around the contact exposed side of the contact board so that the contact is exposed on the inner bottom surface and the terminal protrudes on the outer periphery, and the product outside the bottom surface during the first insert molding process Fill the bottom surface including the recessed part by the presser part with the above resin.Then, the second bent portion is embedded in the bottom surface of the resin case.It is a manufacturing method of the resin case, and when the contact is fixed to the inner bottom surface of the resin case with a thin bottom surface by insert molding processing, on the trace of the product pressing part outside the bottom surface for positioning the contact, It has the effect | action that the manufacturing method of the resin case which the back surface of a contact is not exposed can be obtained.In addition, since the first bent portion of the metal material contact member is embedded during the primary insert molding process, the metal material contact member fixed to the contact board by the primary insert molding process is provided. The part that becomes the contact is firmly fixed to the contact board, so that the contact does not float or be distorted even during the secondary insert molding process, etc., and the secondary insert molding is performed using the same resin. By making the second bent portion of the metal contact member embedded in the bottom surface during processing, the resin during the primary insert molding process and the resin during the secondary insert molding process are in close contact with each other Thus, it also has an effect that it can be made into a strong bonded state.
[0020]
  The invention described in claim 2 is a box-shape having an open top surface, manufactured by the method for manufacturing a resin case according to claim 1, and has a central fixed contact on the inner bottom surface and two conductive outer sides symmetrical to each other. A push-on switch configured by using a resin case in which a fixed contact is exposed and a terminal protrudes from an outer periphery, and the resin case manufactured by the method for manufacturing a resin case according to claim 1 is a box shape with an open top surface. The bottom surface is thin, and the center fixed contact and the two symmetrical outer fixed contacts sandwiched between the inner bottom surface are fixed by insert molding, and each fixed contact is positioned during insert molding. The back of each fixed contact is not exposed on the trace of the product presser on the outside of the bottom, and the terminal protrudes on the outer periphery, so it has excellent dustproof performance. A low-profile and thin push-on switch can be obtained.
[0021]
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
  (Embodiment 1)
  A method for manufacturing a resin case according to the first embodiment of the present invention will be described using a resin case for a push-on switch as an example.
[0023]
  In the resin case for a push-on switch according to the present embodiment, a fixed contact integrally provided with a terminal is insert-molded and fixed. In order to form such a resin case, a continuous metal material that becomes a fixed contact FIG. 1A is a top view, FIG. 1B is a front cross-sectional view, and FIG. 1B is a view showing a metal material contact member provided with a contact substrate in a state where a primary contact molding process is performed on a resin contact substrate. (C) Shown in bottom view.
[0024]
  Each drawing shows the direction in which the metal material contact member is easily positioned when the metal material contact member is sandwiched between the molding dies at the time of insert molding processing, that is, the side serving as the fixed contact is shown as the lower surface side. Of course, depending on the shape of the contact member made of a metal material and the structure of the molding die, the side that becomes the fixed contact may be the upper surface, and the direction may be reversed.
[0025]
  As shown in the figure, a central fixed contact 22 and two outer fixed contacts 23 and 24 project downwardly at symmetrical positions on the lower surface of the contact substrate 21, and a central contact portion around each fixed contact. 22A and the outer contact portions 23A, 24A are exposed and the periphery is surrounded by resin (the cross section is indicated by hatching with small dots), and the upper surface is the periphery of the back surface recesses 22B, 23B, 24B of the fixed contacts 22, 23, 24 Forms a belt-like depression 21A, and both sides thereof are covered with the belt-like resin portions 21B and 21C, and connected to the terminals via connection portions 22C, 23C, and 24C connected to the contact portions 22A, 23A, and 24A. It is connected to connecting parts 22D, 23D, and 24D.
[0026]
  This contact board 21 is for keeping the fixed contacts 22, 23, and 24 of the push-on switch in an accurate positional relationship. Next, a method of primary insert molding that is a forming method thereof will be described with reference to FIG. This will be described with reference to FIGS.
[0027]
  2A is a top view of a contact member made of a metal material formed by pressing a metal plate, FIG. 2B is a sectional view taken along the line KK of FIG. 2A, and FIG. 2A is a cross-sectional view taken along line LL in FIG. 2A, and as shown in FIG. 2A, a central contact portion 22A provided with a protruding central fixed contact 22 (shown in FIG. 2A is a back surface recess 22B). The outer contact portions 23A, 24A provided with the outer fixed contacts 23, 24 (represented by the back surface recesses 23B, 24B in FIG. 2A) are bent at the respective bases to connect the connection portions 22C, 23C, Steps are provided for 24C and connecting portions 22D and 23D, 24D.
[0028]
  In addition, each connection part 22C, 23C, and 24C were provided in the part connected with each connection part 22D, 23D, and 24D.As the second foldThe four bent portions 21D are embedded in the resin at the time of the secondary insert molding process described later, and prevent the connecting portions 22D, 23D, and 24D from floating from the resin.
[0029]
  Then, a plan view of a partial cross section at the time of resin injection when a metal material contact member is sandwiched between an upper mold and a lower mold of a molding die and primary insert molding processing is performed using a predetermined resin 3 is a cross-sectional view taken along the line MM in FIG. 4A, and FIG. 4B is a cross-sectional view taken along the line NN in FIG.
[0030]
  In the same figure, the first product pressing portion 26A (the hatched portion surrounded by the dotted line in FIG. 3) of the upper die 26 of the molding die 25 and the second product pressing portion 27A (shown in FIG. 3) provided at the corresponding position of the lower die 27. Between the central fixed contact 22 and the outer fixed contacts 23 and 24 (shown in FIG. 3 are the respective back surface recesses 22B, 23B, and 24B) between the above-mentioned metal material contact members. The center contact portion 22A and the outer contact portions 23A, 24A provided are sandwiched, and a predetermined resin melted in this state is injected into the mold, whereby the first insert molding process is performed. The contact substrate 21 shown in FIG.
[0031]
  At the tip of each contact 22A, 23A, 24AAs the first bent partThe small bent portions 22E, 23E, 24E provided and embedded in the resin are for preventing the contact portions 22A, 23A, 24A from floating from the resin of the contact substrate 21.
[0032]
  Thereafter, a metal material contact member including the contact substrate 21 shown in FIG. 1 is sandwiched between the upper die 29 and the lower die 30 of the molding die 28, and the same resin as that used in the primary insert molding process is used. FIG. 5 is a plan view of a partial cross section during resin injection when performing secondary insert molding, and FIG. 6 (a) is a cross-sectional view taken along the line P-P in FIG. Is FIG. 6B.
[0033]
  In the figure, between the upper die 29 whose bottom surface of the molding die 28 is flat and the lower die 30 having a recess on the upper surface, the center contact portion 22A and the outer contact portions 23A, 24A of the contact substrate 21 and the back surface thereof. In this state, the same resin as the primary insert molding process (the same as the resin at the time of the primary insert molding process, but the process of the molding process is divided) Therefore, the secondary insert molding process is performed by injecting the cross section into the mold).
[0034]
  As a result, the center fixed contact 22 and the two outer fixed contacts 23 and 24 are exposed downward, and the connecting portions 22D, 23D, and 24D serving as terminals protrude from the outer periphery, and the lower surface side that is the contact exposed side of the contact substrate 21 is exposed. A peripheral wall 31A is formed in the periphery, and a strip-shaped depression formed by the first product pressing portion 26A during the first insert molding process including the exposed portions of the back surface concave portions 22B, 23B, 24B of the fixed contacts 22, 23, 24. The portion 21A is filled with resin, and a box-shaped resin case 31 as shown in the top view of FIG. 7A and the front sectional view of FIG. 7B is connected by connecting portions 22D, 23D, and 24D. can do.
[0035]
  7A and 7B are different from those in FIGS. 1 to 6 in order to clarify the image as a box-shaped resin case for a push-on switch, that is, the resin case 31. The fixed contacts 22, 23, and 24 are shown to be on the upper surface side with the opening portion facing upward.
[0036]
  Here, the resin that is injected into the molding die 25 during the first insert molding process to form the contact substrate 21, and the peripheral wall 31A and the like are injected into the molding mold 28 during the second insert molding process. The resin to be used does not fuse with each other at the joint surface, but since the same resin is used, both are in close contact with each other.
[0037]
  Further, the four bent portions 21D provided at the portions where the connecting portions 22C, 23C, 24C of the contact portions 22A, 23A, 24A are connected to the connecting portions 22D, 23D, 24D are formed by secondary insert molding. Also by being embedded in the resin at the time of processing, the resin at the time of the primary insert molding process and the resin at the time of the secondary insert molding process are firmly bonded.
[0038]
  Thereafter, from the state shown in FIG. 7, the connecting portions 22D, 23D, and 24D are cut at predetermined positions and bent into a predetermined shape, thereby completing individual resin cases 31 for push-on switches.
[0039]
  In the resin case 31 formed as described above, the belt-shaped resin portions 21B and 21C of the contact substrate 21 formed at the time of the primary insert molding process are arranged between the upper mold 29 and the lower mold 30 of the molding die 28. By performing the secondary insert molding process by sandwiching, the contact member made of a metal material during the primary insert molding process is surrounded by the back surface recesses 22B, 23B, 24B of the fixed contacts 22, 23, 24. The band-shaped depression 21A is filled by filling the same resin as the primary insert molding process.
[0040]
  Therefore, according to the present embodiment, the thickness of the bottom surface is small, and the product pressing portion outside the bottom surface for positioning the contact when the contact formed integrally with the terminal is fixed to the inner bottom surface by insert molding processing. A resin case in which the back surface of the contact is not exposed can be obtained.
[0041]
  (Embodiment 2)
  FIG. 8 shows the second embodiment of the present invention.RupuIt is a front view of the partial cross section of the injection molding machine used for the manufacturing method of the resin case for shuffle switches, In the same figure, 32 is a molten resin injection device, The molten material injected from the nozzle 33 with which this front end was mounted | worn The continuous metal material in which the resin passes through the hot runner flow path 35 in the hot runner manifold portion 34 and is guided into the molding die 36 and is sandwiched between the upper die 37 and the lower die 38 of the molding die 36. The contact-making member 39 is insert-molded.
[0042]
  Then, as shown in FIG. 9 which is an enlarged front sectional view of a molding die part which is a main part for performing the insert molding process, the molding die 36 including the upper die 37 and the lower die 38 includes a first die 36. A hot runner manifold portion is provided with a secondary insert molding portion 40, a runner cut portion 41 for cutting off the resin runner and spool formed by the primary insert molding processing, and a secondary insert molding portion 42. Two hot runner nozzles 43 and 44 branched from 34 common hot runner flow paths 35 melt into spool portions 45 and 46 for primary insert molding portion 40 and secondary insert molding portion 42. Resin is supplied.
[0043]
  A heater section 47 is provided around the hot runner flow path 35 and the two hot runner nozzles 43 and 44 in the hot runner manifold section 34 to keep the molten resin passing through them at a predetermined temperature. Yes.
[0044]
  Then, a continuous metal material contact member 39 is sandwiched between the upper die 37 and the lower die 38 of such a molding die 36, so that the primary insert molding process, the resin runner separation, and the secondary insert molding are performed. FIG. 10 is a top view of the contact member made of a metal material showing the state after each processing step in this case.
[0045]
  As shown in the figure, two central fixed contacts 22 and two outside each of two continuous strip-shaped metal material contact members 39 in a pre-processing state 39A formed by pressing a metal plate are parallel to each other. The molten resin injection device 32 described above is sandwiched between the upper die 37 and the lower die 38 of the molding die 36 so that the portions to be the fixed contacts 23 and 24 are located at predetermined positions of the primary insert molding processing portion 40. By injecting the molten resin injected from the nozzle 33 into the spool portion 45 through the hot runner flow path 35 and the hot runner nozzle 43 of the primary insert molding processing portion 40, first, each fixed contact described above is formed on the lower surface side. Four resin contactors 21 (not shown) are exposed, and two resin runners centering on resin spools 48 extending upward, two for each metal material contact member 39. A contact substrate molding state 39B joined by 49 is performed as described above primary insert molding.
[0046]
  When this molten resin is injected into the spool portion 45 through the hot runner flow path 35 and the hot runner nozzle 43 of the primary insert molding portion 40, the hot runner nozzle 44 of the secondary insert molding portion 42 is used. The molten resin is also injected into the spool portion 46 through, and processing in the secondary insert molding processing portion 42 will be described later.
[0047]
  Next, as shown in the front view of the partial cross section showing the mold opening state of the injection molding machine in FIG. 11, the molten resin is injected into the upper portion from the upper mold 37 and the hot runner manifold section 34 by the driving device. By moving the portion including the device 32 upward, a predetermined dimension is opened between the upper die 37 and the lower die 38 of the molding die 36, and in this state, the four resin runners centering on the resin spool 48 described above. The two metal material contact members 39 connected at 49 are simultaneously sent to the left by a predetermined pitch as shown by arrows in FIG. The portions to be the four central fixed contacts 22 and the outer fixed contacts 23 and 24 in the state before processing are placed at predetermined positions of the primary insert molding processing portion 40, and the mold shown in FIG. 12 (a) is opened. The As shown in the enlarged partial sectional view of the runner cut portion in the state, the four resin runners centering on the resin spool 48 by the primary insert molding processing of the contact board molding state 39B of the two metal material contact members 39 49, the connecting portions 49 </ b> A with the respective contact substrates 21 are respectively matched with the positions of the edges of the through holes 50 of the lower mold 38 of the runner cut portions 41 as the fixed cutting blades.
[0048]
  In addition, although the runner cut part 41 is provided in four places corresponding to each of the four resin runners 49, FIG. 12 is simplified and shows only one.
[0049]
  Then, in this state, the upper die 37 of the molding die 36 is moved downward by the driving device to close the space between the upper die 37 and the lower die 38, and as shown in FIG. The pressing portion 51 held by the upper die 37 of the cut portion 41 is lowered, the contact substrate 21 is pressed against the lower die 38 by the pressure of the holding spring 52, and the upper die 37 is further lowered so that the movable die is fixed to the upper die 37. The connecting portions 49A of the four resin runners 49 connected to the contact substrates 21 are all cut by the cutting blades 53 and the fixed cutting blades of the lower mold 38, and the four resin runners 49 connected to the resin spools 48 are connected to the respective contact substrates 21, that is, The two metal material contact members 39 are separated from each other and discharged downward through the through holes 50. The two metal material contact members 39 are each provided with two fixed contacts on the lower surface. A contact substrate holding state 39C which point the substrate 21 is left.
[0050]
  Thereafter, with the mold 36 closed, the molten resin is injected into the spool portion 45 through the hot runner nozzle 43 of the primary insert molding processing portion 40, so that the two metal material contact members 39 are not processed. The portion of the state 39A newly becomes a contact substrate molding state 39B in which four flat contact substrates 21 are connected by four resin runners 49 for every two metal material contact members 39.
[0051]
  Even when the molten resin is injected into the spool portion 45 through the hot runner nozzle 43 of the primary insert molding portion 40, the molten resin is supplied to the spool portion 46 through the hot runner nozzle 44 of the secondary insert molding portion 42. However, the processing in the secondary insert molding processing portion 42 will be described later.
[0052]
  Then, a new dimension is opened again between the upper die 37 and the lower die 38 of the molding die 36, and the two metal material contact members 39 are fed to the left in FIG. The portion of the contact substrate molding state 39B comes to the position of the runner cut portion 41, the portion of the pre-processing state 39A comes to the position of the primary insert molding processing portion 40, and the portion of the contact substrate holding state 39C is It comes to a predetermined position of the secondary insert molding part 42.
[0053]
  In this state, by closing the space between the upper die 37 and the lower die 38 of the molding die 36 again, the four resin runners 49 are cut at the connecting portion 49A with the contact board 21 in the runner cut portion 41, and further the die In a state in which the molten metal is injected into the spool portions 45 and 46 through the hot runner flow path 35 and the hot runner nozzles 43 and 44 in the closed state, the primary insert molding portion 40 has the metal material in the pre-processing state 39A. The contact member 39 is brought into the contact board molding state 39B, and the second insert molding processing portion 42 exposes the two metal material contact members 39 in the contact board holding state 39C, and the fixed contact (not shown) is exposed on the inner bottom surface. The four resin runners 5 centering on the resin spool 54 that extends upward, two box-shaped resin cases 31 for each metal material contact member 39. In coupled, the resin case molded state 39D.
[0054]
  At this time, molten resin is injected into the spool portion 45 through the hot runner nozzle 43 of the primary insert molding portion 40 and injected into the spool portion 46 through the hot runner nozzle 44 of the secondary insert molding portion 42. To adjust the balance of the resin flow of the molten resin, the conditions of the heater section 47 that keeps the hot runner nozzles 43 and 44 at a predetermined temperature are changed, and the diameter of the nozzle tip that is the resin outlet of the hot runner nozzles 43 and 44 is changed. Is done.
[0055]
  In this way, the upper mold 37 and the lower mold 38 are opened between the molding dies 36 to feed the two metal material contact members 39 by a predetermined pitch, and the molten resin is passed between the upper mold 37 and the lower mold 38. By repeating the process of injecting into the molding die 36, primary insert molding processing, resin runner and spool separation processing, secondary insert molding processing are performed on two continuous metal material contact members 39. Can be performed sequentially.
[0056]
  As a result, a box-shaped resin case 31 is formed continuously with the two strip-shaped metal material contact members 39, and two resin spools 54 extending upward are provided at the center of each metal material contact member 39. The resin case molding state 39D connected by the four resin runners 55 is obtained.
[0057]
  Thereafter, the two metal material contact members 39 in the resin case molding state 39D are separated from the two metal runners 55 by detaching the connecting portion 55A from the resin case 31 with a dedicated cutting machine. The material contact member 39 is separated. As shown in the left end of FIG. 10 and FIG. 7 of the first embodiment, the box-shaped resin case 31 for the push-on switch is connected to the connecting portions 22D, 23D, It can be made into the form connected by 24D.
[0058]
  As described above, according to the present embodiment, the primary insert molding process for molding a flat contact board and the secondary insert molding process for forming a box-shaped resin case with a fixed contact exposed on the inner bottom surface are performed. It can be performed continuously and efficiently, and the structure of the molding die and injection molding machine is simple, the manufacturing cost of the molding die is reduced, and the resin runner and spool are easily processed during molding. Molding processing costs are also reduced.
[0059]
  (Embodiment 3)
  FIG. 13 is a front sectional view of a push-on switch according to a third embodiment of the present invention, and FIG. 14 is an exploded perspective view thereof.
[0060]
  In the same figure, 56 is the same as the individual resin case 31 made by the resin case manufacturing method described in the first embodiment. Since the resin for the next insert molding process is the same resin and integrally forms a resin case, in FIG. 13 and the drawings used for the following description, the resin portion of the resin case 56 is integrated as a cross section. Is represented by hatched hatching.
[0061]
  In addition, a shallow recess 56 </ b> B extending between the inside and the outside is provided in a part of the upper end surface of the peripheral wall 56 </ b> A of the resin case 56.
[0062]
  The lower end of the outer periphery rests on the outer fixed contacts 23 and 24 of the two outer contact portions 23A and 24A on the inner bottom surface of the resin case 56, and the lower surface of the apex portion is spaced from the central fixed contact 22 of the center contact portion 22A by a predetermined distance. A circular dome-shaped movable contact 57 made of an elastic metal thin plate is accommodated in the resin case 56 so as to confront each other with a gap, and a flexible resin film 58 having an adhesive layer on the lower surface of the peripheral wall 56A of the resin case 56. The push-on switch according to the present embodiment is formed by covering the upper end surface.
[0063]
  The operation of this push-on switch is as shown in the front sectional view of the operating state of FIG. 15 by pressing the center of the resin film 58 with the operation button 59 of the electronic device used and bending it downward. The circular dome-shaped movable contact 57 reverses with moderation, and the lower surface of the central portion hits the central fixed contact 22 so that the outer fixed contacts 23 and 24 and the central fixed contact 22 That is, between the outer connection terminals 23E and 24E and the center connection terminal 22E (see FIG. 14) is conducted, and after that, when the force pushing the center of the resin film 58 is removed, the circular dome-shaped movable contact 57 The original state shown in FIG. 13 is restored by the elastic restoring force, and the space between the outer connection terminals 23E and 24E and the center connection terminal 22E is again opened.
[0064]
  When the push-on switch is operated by pressing, the flexible resin film 58 is pushed and bent downward, whereby the volume in the resin case 56 covered with the resin film 58 is reduced. At this time, since the air in the resin case 56 flows through the shallow recess 56B at the upper end of the surrounding wall 56A, the moderation feeling associated with the reversing operation of the circular dome-shaped movable contact 57 is clear.
[0065]
  In addition, when the push-on switch according to the present embodiment is mounted on the wiring board 60 of the electronic device used, the air in the resin case 56 expanded by the heat due to soldering is used as the shallow recess 56B at the upper end of the peripheral wall 56A. It is also possible to prevent the resin film 58 from being peeled off by escaping from the area.
[0066]
  Further, as described in the first embodiment, the center contact portion 22A and the outer contact portions 23A, 24A formed integrally with the center connection terminal 22E and the outer connection terminals 23E, 24E of the resin case 56 are fixed by insert molding. Since the back surfaces of the center contact portion 22A and the outer contact portions 23A and 24A are not exposed at the marks of the product pressing portion outside the bottom surface for positioning the contact portion when performing soldering, when mounting on the wiring board 60, soldering is performed. The flux does not enter the contact portion of the resin case 56.
[0067]
  The push-on switch shown in the front cross-sectional view of FIG. 16 has a central hole 61A on the peripheral wall 56A of the resin case 56 of the push-on switch according to the present embodiment shown in FIG. A lid 61 having a lower end is mounted, and a driving projection 62A at the lower end is placed on the resin film 58 in the recess 61B, and an upper pressing projection 62B projects upward from the central hole 61A of the lid 61. The push button 62 is accommodated, and when the push protrusion 62B on the top of the push button 62 is pressed, the lower drive protrusion 62A is the center of the flexible resin film 58 on the upper end surface of the resin case 56, that is, circular. The center portion of the dome-shaped movable contact 57 can be surely pushed to perform a more stable operation.
[0068]
【The invention's effect】
  As described above, according to the present invention, when the contact is fixed to the inner bottom surface of the resin case having a thin bottom surface by insert molding, the contact point is traced to the mark of the product pressing portion outside the bottom surface for positioning the contact. The back side ofAnd a push-on switch configured by using the resin case manufactured by the resin case and the resin case manufactured by the insert case, so that the resins can be in close contact with each other to be in a tightly bonded state.The advantageous effect that can be obtained is obtained.
[Brief description of the drawings]
FIG. 1A is a top view of a contact member made of a metal material provided with a contact board after a first insert molding process in a method of manufacturing a resin case for a push-on switch according to a first embodiment of the present invention.
  (B) Front sectional view
  (C) Bottom view
[Fig. 2] (a) Top view of contact member made of the same metal material
  (B) Sectional view taken along line KK in FIG.
  (C) Sectional view taken along line LL in FIG.
[Fig. 3] Resin in the first insert molding processInjectionTop view of partial cross section
4A is a cross-sectional view taken along line MM in FIG.
  (B) Sectional view taken along line NN in FIG.
FIG. 5: Resin in the second insert molding processInjectionTop view of partial cross section
6A is a cross-sectional view taken along line P-P in FIG.
  (B) Sectional view taken along line QQ in FIG.
7A is a top view of a resin case connected by a connecting portion. FIG.
  (B) Front sectional view
FIG. 8 is a partial cross-sectional front view of an injection molding machine used in a method for producing a resin case for a push-on switch according to a second embodiment of the present invention.
FIG. 9 is an enlarged front cross-sectional view of the main part of the molding die.
FIG. 10 is a top view of a contact member made of metal material showing a state after each processing step.
FIG. 11 is a partial sectional front view showing the mold opening state of the injection molding machine.
FIG. 12 is an enlarged partial sectional view of a runner cut portion of the same molding die
  (A) The figure which shows the state which opened the metal mold | die
  (B) The figure which shows the state which closed the metal mold | die
FIG. 13 is a front sectional view of a push-on switch according to a third embodiment of the present invention.
FIG. 14 is an exploded perspective view of the same.
FIG. 15 is a front sectional view showing the same operation state.
FIG. 16 is a front cross-sectional view of a push-on switch having another configuration.
FIG. 17 is a cross-sectional view of a conventional insert-molded part manufacturing apparatus in a state before molding with a molding die opened.
FIG. 18 is a cross-sectional view showing the molding die closed.
FIG. 19 is a cross-sectional view showing a state where the mold mold cavity is filled with molten resin.
FIG. 20 is a sectional view showing a state where the molding die is opened after cooling the molten resin.
[Explanation of symbols]
  21 Contact board
  21A depression
  21B, 21C Resin part
  21D, 22E, 23E, 24E Bending part
  22 Center fixed contact
  22A Central contact
  22B, 23B, 24B Back side recess
  22C, 23C, 24C connections
  22D, 23D, 24D connecting part
  22E Central connection terminal
  23, 24 Outer fixed contact
  23A, 24A Outer contact
  23E, 24E Outer connection terminal
  25, 28, 36 Mold
  26, 29, 37 Upper mold
  26A First product presser
  27, 30, 38 Lower mold
  27A Second product presser
  31,56 Resin case
  31A, 56A Surrounding wall
  32 Molten resin injection device
  33 nozzles
  34 Hot runner manifold section
  35 Channel for hot runner
  39 Metal material contact members
  39A State before processing
  39B Contact board molding state
  39C Contact board holding state
  39D resin case molding state
  40 Primary insert molding section
  41 Runner cut part
  42 Secondary insert molding section
  43,44 Hot runner nozzle
  45, 46 Spool part
  47 Heater
  48, 54 Plastic spool
  49,55 Resin Runner
  49A, 55A connecting part
  50 through holes
  51 Presser foot
  52 Presser spring
  53 Movable cutting blade
  56B depression
  57 Circular dome shaped movable contacts
  58 Resin film
  59 Operation buttons
  60 Wiring board
  61 Cover plate
  61A Center hole
  61B recess
  62 pushbutton
  62A Protrusion for driving
  62B Protrusion for pressing

Claims (2)

Preparing and forming a first bent portion embedded during the first insert molding process, a second bent portion embedded during the second insert molding process, and a contact member made of a metal material integrally having a terminal during the second product holding portion provided at the corresponding position of the first product holding section and the lower mold provided on the upper mold of the mold, pinch the surface and the opposite surface thereof a contact of the metal material made contact member, predetermined The first insert molding process is performed using the above resin, the contact is exposed at least on the upper surface or the lower surface, the terminal protrudes on the outer periphery, the first bent portion is embedded, and the metal material contact member is A fixed flat contact board is formed, and then this contact board is sandwiched between the upper mold and the lower mold of the molding die and the second resin is used for the secondary insert molding process. Insert molding is performed, and the above contact is A bottom surface including a recess formed by a product pressing portion on the outer side of the bottom surface during the first insert molding process, and a peripheral wall is formed around the contact exposed side of the contact substrate so that the terminal protrudes on the outer periphery. The resin case is filled with the above resin and the second bent portion is embedded in the bottom surface of the resin case to obtain a resin case . A box-shape with an open top surface manufactured by the method for manufacturing a resin case according to claim 1, wherein a central fixed contact and two symmetrical outer fixed contacts sandwiched between the inner bottom surface and the outer periphery are exposed on the outer periphery. Push-on switch constructed using a resin case with protruding terminals.

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