CN2052146U

CN2052146U - Push-button switch with silver-pulp contacts for electronic circuits

Info

Publication number: CN2052146U
Application number: CN 89204564
Authority: CN
Inventors: 林万兴
Original assignee: DAREN ELECTRONIC Ltd
Current assignee: DAREN ELECTRONIC Ltd
Priority date: 1989-04-12
Filing date: 1989-04-12
Publication date: 1990-01-31

Abstract

The utility model relates to a push-button switch with silver-pulp contacts for electronic circuits One PE plastic slice is fixed on a printed circuit board. The plastic slice is provided with one or a plurality of convex points. Silver-pulp is coated at the inner face of the convex points. Convex poles corresponding to each convex point on one rubber cushion are actuated respectively by one round push-button. Each convex point is actuated by the convex poles indirectly. The silver-pulp contacts the printed circuit to reach a switch function. Because the conductivity of the silver is better than common metal, speed of order transmission can be faster. The utility model has the advantages of better hand feel and longer service life. The printed circuit board can be protected from oxidation or dust and fouling, etc. The utility model has the advantages of simple structure, economy and practicality.

Description

Push-button switch with silver-pulp contacts for electronic circuits

The utility model relates to a kind of electronic circuit and starches the contact key switch with silver, particularly a kind of silver slurry contact finger key switch that utilizes indirect short circuit mode to reach the conduction purpose is to be formed by printed circuit board (PCB), the PE plastic slice, the rubber gasket that is provided with projection and the circular key institute structure that are coated with silver-colored slurry.

Past, the key switching structure of general electronic circuit, shown in figure five, be generally a cross ridge 91, this cross ridge 91 and be equipped with the radian of indent evagination, and the side is provided with a conductive rubber 92 under

cross button

9,92 of this conductive rubbers are provided with the effect that 4 contact points 93 that are added with conductive materials (Carbon) form switch corresponding to cross ridge 91, make aforementioned components be mounted on printed circuit 94(PCB in regular turn) on, the signal of its printed circuit board (PCB) 94 source promptly is the short circuit phenomenon that relies on aforementioned conductive rubber 92 to contact with circuit board 94 (being to actuate the conductive rubber 92 of its below by pushing cross ridge 91 on the aforementioned pressing key 9), and conducting comes executable operations to produce to instruct to pass in main frame, this prior art structure system utilizes the elastic force of conductive rubber 92, make it instantaneous short circuit and unlikely permanent short (elastic force of conductive rubber 92 can make it automatically reset when power disappeared outside pushing, to reach the purpose of switch).

But, aforementioned prior art is provided with the button 9 of evagination radian, the user is behind long-time pressing operation, often because of the Long contact time of finger with the button four limit ends of projection, cause the sensation that finger produces preface Chu discomfort, and because of it is the mode that adopts direct short-circuit, after using a period of time, promptly, causing and printed circuit board (PCB) 94(PCB often because of the conductive materials on the conductive rubber 92 (carbon) comes off) last contact is stained thereby cause loose contact and can't move instruction.Moreover, prior art press-key structure mode, 92 of its printed circuit board (PCB) 94 and conductive rubbers are to present open state, and circuit board is contacted with air, cause materials such as dust in the air or moisture and very easily produce oxidative phenomena with contacting of circuit board, its failure rate is very high.

Therefore, the utility model provides a kind of electronic circuit to starch the contact key switch with silver, lie in and directly fix a PE plastic slice on the printed circuit board (PCB), and on plastic slice, establish with several be coated with silver slurry salient point, and actuate a rubber gasket by a circular key, making the projection on the rubber gasket be actuated the salient point of its correspondence respectively and reach the purpose of contact conducting, is mode and the preferable silver slurry of conductivity with indirect short circuit, forms one and contacts reliable and key switch improvement structure life-span length.

The main purpose of the utility model is promptly providing an electronic circuit that is provided with the PE plastic slice with silver slurry contact key switch, and its PE plastic slice system is directly fixed on the printed circuit board (PCB), but is seal structure and protective circuit plate and can prolongs its useful life.

Another purpose of the utility model is providing an electronic circuit that is provided with the circular flat button to starch the contact key switch with silver, and its plane formula circular key can have preferable feel and increase its practicality.

The another purpose of the utility model is to pass on instruction by the salient point that is coated with the silver slurry on the PE plastic slice and the mode of the indirect short circuit of circuit board, and can passes on instruction rapidly providing an instruction transfer rate very fast silver slurry contact key switch.

A purpose again of the utility model is at the silver that provides a circuit board to be difficult for oxidation slurry contact key switch, makes circuit board can not be subjected to the stained also not contact of reason foreign matter and cause damage.

Other purposes and the contexture of relevant the utility model, existing conjunction with figs. embodiment is described as follows in detail:

Figure one: the utility model embodiment exploded view.

Figure two: the utility model profile.

Figure three: another embodiment exploded view of the utility model.

Figure four: the utility model embodiment user mode schematic perspective view.

Figure five: the exploded view of prior art cross key switch.

The figure number explanation:

1: printed circuit board (PCB) 3: rubber gasket 4: circle connects key

2:PE plastic slice 31: protruding shelves 41: shelves hole

21: salient point 32: projection 9: button

22: silver slurry 91: cross ridge

92: conductive rubber

93: contact point

94: printed circuit board (PCB)

Please cooperate and consult figure one embodiment exploded view, figure two profiles and figure four embodiment and use schematic perspective view, the utility model " electronic circuit is starched the contact key switch with silver " includes printed circuit board (PCB) 1, PE plastic slice 2, rubber gasket 3 and circular key 4, wherein:

Printed circuit board (PCB) 1 is the circuit board that general electronic circuit is used;

PE plastic slice 2 is to be fixed on the printed circuit board (PCB) 1, on the thin slice 2 and be provided with several salient points 21, all is coated with the splendid silver slurry 22 of conductivity on respectively these salient point 21 inner concaves near printed circuit board (PCB) 1;

Rubber gasket 3 is to be positioned on the PE plastic slice 2, and its upper surface is provided with several protruding shelves 31, and lower surface then is provided with several projections 32 corresponding to aforementioned salient point 21;

Surface system is flat state on the circular key 4, only establishes the lines with the some user's of being convenient to finger presses on the surface, and the bottom surface of button 4 then is provided with one or more grades hole 41 corresponding to aforementioned protruding shelves 31.

Other sees also another embodiment exploded view of figure three, its rubber gasket 3 still can be directly with projection 32 replacements of some independences and can reach identical creation purpose, respectively also be provided with the creation purpose that to fill in aforementioned shelves hole 41 on this projection 32 respectively, respectively also be provided with respectively on this projection 32 and can fill in interior protruding grade 31 in aforementioned shelves hole 41.

System is fixed in PE plastic slice 2 on the printed circuit board (PCB) 1 in advance during combination, and respectively these protruding shelves 31 of rubber gasket 3 are filled in respectively in the shelves hole 41 of circular key 4, again button 4 grades are arranged at and are fixed with on the printed circuit board (PCB) 1 on PE plastic slice 2 places, shown in figure two, embodiment is finished product then shown in the game machine of figure four, when pushing circular key 4, (there is 0 °, 90 °, 180 °, four press points of 270 ° of grades, relevant this part will have detailed description in this paper back segment), promptly actuate rubber gasket 3, make the projection 32 of its bottom surface be contacted the salient point 21 of PE plastic slice 2, and it is pressed down and make the silver slurry of its inner face be able to the contact print circuit, cause and cause indirect short circuit, power disappears and after circular key 4 and rubber gasket 3 reset outside pushing, the elastic force of PE plastic slice 2 then makes its salient point 21 automatic rebound resets, and reaches the purpose of switch.

The utility model " electronic circuit is starched the contact key switch with silver " embodiment, system is an example with four contacts, four contacts that make key switch are respectively as the operation control of four directions such as 0 ° on plane, 90 °, 180 ° and 270 °, thereby make the vernier point on game machine or the computer display device to control variation because of moment, and on 360 ℃ of planes, do the random migration of any angle, to finish the transmission of various angle instructions smoothly.

The circular key 4 that is different from prior art cross ridge 91 of its plane formula; can have round lubrication and unlikely stimulation hand; so can have preferable feel; and because of being starches the indirect short circuit mode of 22 contacts with the excellent silver of conductivity; so its instruction transfer rate is very fast; and the bounce of PE plastic slice 2 can be born the push action more than 6,000,000 times at least; be the seal state more because of PE

plastic slice

2 and 1 of printed circuit board (PCB); so can protect printed circuit board (PCB) 1 to make unlikely stained or generation oxidation; more can not cause the damage of product because of the contact of foreign matter; the dustproof effect of 2 tools of its PE plastic slice, promptly thereby the failure rate of circuit board is reduced significantly.

In sum, the utility model " electronic circuit with silver slurry contact key switch " is strictly at first to be created and meets practicality, and really can reach aforementioned the utility model and respectively create purpose, has the feature that instruction transmits fast and long service life.

Claims

1, a kind of electronic circuit is starched the contact key switch with silver, it is characterized in that, on directly fixing-PE plastic slice on the printed circuit board (PCB) and be provided with one or more salient point, respectively all be coated with the silver slurry within this salient point on the concave surface, promptly be provided with a rubber gasket on the PE plastic slice, the rubber gasket lower surface then is provided with one or more projection for aforementioned respectively this salient point, the pad upper surface is then established the protruding shelves with one or more, respectively these protruding shelves all can be filled in the shelves hole of its circular key and use fixing, also can be directly replace rubber gasket with one or more independent projection, respectively also be provided with the protruding shelves that to fill in grade hole on this projection respectively, circular key has plane upper surface, has preferable feel, instruction transmit fast and be difficult for oxidation and the life-span long.