CN2374960Y - Key switch - Google Patents

Abstract

A kind of key switch includes: pedestal, thin film circuit, elastic element backing plate, bridge formation and keycap. The pedestal has first and second to fix area, and the first fixing area is vertically bent by the punching of pedestal one and is in

Font; Bridge formation is made of two sliding parts, wherein arcuation upwardly extends the first sliding part at an angle or tiltedly, and one end is in a tabular plate body, and in the plate body end, two sides, which integrally upwardly extend two rod pieces to the other end, has two tenons, and plate body accommodating is fixed to be fixed in area first, and the second sliding part is in

Font, two sliding part centers are pivotally connected by tenon with recess or sliding slot free to rotate.

Description

Key switch

The utility model relates to a kind of key switch, and especially a kind of Stability Analysis of Structures and keycap move up and down steadily, are difficult for the key switch of card key.

Keyboard is one of input unit that the most generally uses in the information electronic installation (as computer), the button of general keyboard directly is socketed on the base, the cylinder that extends bottom keycap is replaced on a spring and is done knee-action, uses the keyboard of this structure, and the cylinder of its keycap must be inserted the certain degree of depth of base, otherwise very easily cause the card key, therefore, the keyboard of this structure must have certain thickness, and, because a spring assembly is arranged, make this keyboard more complicated in assembling.Yet, along with the information electronic installation develops towards portable, Portable direction, aforementioned keyboard has not met the tendency of the day, so just there is the keyboard of staggered form linkage to produce, not only keyboard thickness can be reduced, the stationarity when button moves up and down can also be guaranteed simultaneously.But still there are many shortcomings in design in the keyboard of the staggered form linkage of prior art, for example:

1. the keyboard of No. the 5th, 457,297, No. the 83204123rd, TaiWan, China patent and United States Patent (USP), its staggered form linkage combination pivotally, and two ends pivotally are fixed on keycap and the base respectively up and down.In addition, pivot in jamming seat and slide for the ease of tenon, design has certain clearance, but this gap will cause button to push loosening in the process.

2. United States Patent (USP) the 4th, 433, and 225 and 5,399, No. 822 keyboard, the keycap both sides all are chute structures, in order to match with the staggered form linkage of pivoting.Use the keyboard of this structure, when button was pressed into half stroke, keycap can produce unexpected loosening in the horizontal direction, easily causes key error.In addition, at United States Patent (USP) the 5th, 278,, will produce the loosening problem of keycap though the structure of different chutes is arranged in No. 371.

3. further, have a kind of spring assembly to be added design in the staggered form linkage, as United States Patent (USP) the 5th, 382,762 and 5,466, No. 901, its spring is installed on the base and replaces an ora terminalis of staggered form connecting rod, the stationarity when so having buffering effect with the maintenance key entry.Yet the assembly element of this design is too much and step is also quite loaded down with trivial details, more needs accurately to align, simultaneously because of there being spring to exist, so obviously will increase complexity and degree of difficulty when assembling.

Other relevant patents please refer to the TaiWan, China patent the 85209731st, 85206394,85216540 and No. 85216541, and United States Patent (USP) the 5th, 278,372 and 5,278, No. 3745 etc.

The purpose of this utility model provides a kind of key switch, makes it can keep horizontal stable and difficult card key or loosening in the process of pushing.

The technical solution of the utility model is: it mainly comprises base, thin film circuit, flexible member backing plate, bridge formation and keycap.Wherein base has first and second fixing district, and the first fixing district is the ㄇ font by vertical bending of base one punching out; Bridge formation is made up of two sliding parts, two sliding part central authorities articulate free to rotate by tenon and depression or chute, wherein, first sliding part is oblique arcuation, comprise a plate body, integrated two rod members in slave plate end of body both sides and Rod end two tenons, this plate body and rod member are encircled into square shape, and ccontaining fixing fixes in the district first, the support of the first sliding part resilient bias is provided, two rod members at an angle or tiltedly arcuation extend upward, and second sliding part is the ㄇ font, and its two rod members two ends have four tenons, by said structure spring or pivoting device are reduced, increase the stability of keycap knee-action.

Because the utility model has adopted such scheme, this key switch can keep horizontal stable and be difficult for blocking key or loosening in the process of pushing, also can increase the range of choice of flexible member material in addition.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the three-dimensional exploded view of key switch of the present utility model.

Fig. 2 is the assembling stereogram of first sliding part of the present utility model.

Fig. 3 A, B, C, D are that the III-III of Fig. 2 analyses and observe the ccontaining fixing of the first sliding part plate body at the first movement decomposition figure that fixes in the district.

Fig. 4 is the combination of side view of key switch of the present utility model, and wherein button is free state.

Fig. 5 is the three-dimensional exploded view of another embodiment of key switch of the present utility model.

With reference to the accompanying drawings, the utility model will be further described in conjunction with the embodiments:

In key switch shown in Figure 11, it comprises base 2, thin film circuit 3, flexible member backing plate 4, bridge formation 6 and keycap 7.Wherein the vertical bending of base 2 one punching out is ㄇ font first and fixes district 21, the second and fix district 22 and be bent into a plate body shape by base 2 one punching out, and a chute 221 is offered in the appropriate location therebetween, and the appropriate location is bent with a holding block 23 in base 2.First and second of thin film circuit 3 respective seat 2 fixes 21,22 places, district and offers perforation 31,32, in order to pass through for first and second fixing district 21,22 and holding block 23 respectively.Flexible member 5 on the flexible member backing plate 4 can press thin film circuit 3 when pressurized, form it and electrically conduct, and when pressure was removed, flexible member 5 recovered by the elasticity of self, left thin film circuit 3.In addition, the appropriate position offers perforation 41,42 in the flexible member backing plate 4, can fix district 21,22 and holding block 23 for this first and second and pass through.

Bridge formation 6 is articulated by first sliding part 61 and second sliding part, 62 intersections and forms, wherein, first sliding part 61 comprises a plate body 611 substantially, extend two rod members 613 from both sides, plate body 611 end one, in the end of this two rod member 613 and extend and be provided with two horn shape tenons 612, and surround with plate body 611 by two rod members 613 and to be square shape.Please together with reference to Fig. 2, offer a clamping hole 615 in this plate body 611, this clamping hole 615 has an ora terminalis 617, a depressed part 616 is offered in the appropriate position in the middle of these ora terminalis 617 relative opposite sides, when the plate body 611 of first sliding part 61 penetrates ㄇ font second and fixes in the district 22 fixing, pass and be resisted against on the ora terminalis 617 for holding block 23.See also Fig. 3 A, B, C, D, the plate body 611 ccontaining fixings that are first sliding part 61 are at the first micromotion figure that fixes in the district 21, wherein the wall 619 of depressed part 616 takes the form of inclined plane, elasticity by first sliding part, 61 plate bodys is resisted against on the holding block 23 the skew wall face 619 of depressed part 616, and then holding block 23 is imported in the clamping holes 615, make holding block 23 replace on ora terminalis 617 in addition fixing.So, by the plate body 611 of the first fixing district 21, in case it pushes loose or dislocation in the process at keyboard with holding block 23 actings in conjunction stablizing fixing first sliding part 61.

Please consult Fig. 1 and Fig. 2 again, rod member 613 is angled or be oblique arcuation and extend upward from plate body 611 both sides, and also has tenon 614 in the outer surface centre position of this rod member 613.Second sliding part 62 also is to connect into a ㄇ font by two rod members 623, in the middle of both sides rod member 623 relative inner surfaces, be provided with depression 624, can articulate the tenon 614 that first sliding part, 61 both sides rod members, 613 outer surfaces are provided with, and but donating bond cap 7 pivots and knee-action is oppressed this flexible member 5, forms the conducting of thin film circuit 3 as described above.In addition, has paired tenon 621,622 respectively in the end of both sides rod member 623, wherein tenon 621 fixes second fixing in the chute 221 in district 22 of passing 32,42 from boring a hole, and tenon 621 can be pivoted in chute 221 and slide when the keyboard knee-action.

Please consult Fig. 4 together, keycap 7 has from the downward cap post 71 that extends of central top and the pivot part 72 and the chute 74 of four corners.Wherein this pivot part 72 can articulate tenon 622, and chute 74 can be installed with tenon 612.Its cap post 71 then forms the conducting of circuit 3 as described above with pressuring elastic element 5 when keycap 7 presses down.

Because the utility model keeps the key switch of button stability more easy in assembling with spring buffer than prior art,, more can prevent problems such as card key or jumping key simultaneously by the plane holding structure of first sliding part 61.In addition, after removing the compressing power on the keycap 7, because of first sliding part, 61 free states are the structures that are oblique arcuation, so can keyboard be restored to the original state by the elasticity of this first sliding part 61 self, thereby the elasticity of flexible member 5 is required just to be not so good as the flexible member strictness of prior art, its formation that need only restore to the original state is automatically opened circuit with thin film circuit 3 and is got final product, and therefore, the material of flexible member 5 has selectivity widely.

In second embodiment of the present utility model shown in Figure 5, it and first embodiment do not exist together be second sliding part 62 ' both sides rod member 623 ' the relative inner surface be provided with the chute 624 that caves inward ', can slip into and pivot for tenon 614, in addition, its base 2 ' second fix district 22 ' by two fix projections 222 ' a be encircled into chute 221 ', for second sliding part 62 ' tenon 621 fix and pivot wherein.

The relative inner depression in the surface 624 interchangeable (not shown) of the tenon 614 in the outer surface centre position of the both sides rod member 613 of first sliding part 61 of first embodiment and the both sides rod member 623 of second sliding part 62, promptly be provided with depression in the outer surface centre position of the both sides rod member 613 of first sliding part 61, and be provided with tenon on the relative inner surface of the both sides rod member 623 of second sliding part 62, both articulate, and also can reach identical effect.Same, the chute that caves inward 624 on the relative inner surface of the tenon 614 in the outer surface centre position of the both sides rod member 613 of first sliding part 61 of second embodiment and the both sides rod member 623 of second sliding part 62 ' also interchangeable, and can reach identical effect equally.

Claims (5)

1. a key switch comprises base, thin film circuit, flexible member backing plate, bridge formation and keycap, it is characterized in that: this base is provided with first and second and fixes district and holding block; Thin film circuit which is provided with for first and second perforation that fixing is distinguished and holding block passes relatively; The flexible member backing plate which is provided with at least one flexible member, and has for first and second perforation that fixing is distinguished and holding block passes relatively; Build bridge, it has first sliding part and second sliding part, and wherein first sliding part further comprises a plate body, offers clamping hole on this plate body; First sliding part of this bridge formation and an end of second sliding part are connected on the keycap, this first sliding part fixes on base with respect to the other end that is connected keycap with second sliding part, and the plate body of first sliding part fixes in the first fixing district, and the holding block of this base is buckled in this clamping hole.

2. key switch according to claim 1 is characterized in that the first fixing district is the ㄇ font and the plate body of ccontaining fixing first sliding part.

3. key switch according to claim 1 is characterized in that this clamping hole has an ora terminalis away from the rod member end, and a depressed part is offered in the middle appropriate location of its relative opposite side.

4. key switch according to claim 3 is characterized in that this depressed part is away from fixing nose end and taking the form of inclined plane.

5. key switch according to claim 1 is characterized in that this first fixing district comprises the ㄇ font body that the plate body of first sliding part can be locked wherein.