SU1322249A1 - Keyboard - Google Patents

Abstract

The invention relates to automation and computer technology and can be used in control panels, keyboard input devices for computers and television complexes installed on underwater and flying vehicles, as well as data transmission devices. The purpose of the invention is to increase the reliability of the keyboard by eliminating the possibility of false alarms with changes in external pressure and eliminating contact oxidation. The keyboard contains a base made of dense elastic material, two printed circuit boards with holes, an elastic layer with conductive zones, contact groups, a damping membrane. On the front of the base there are dome-shaped protrusions imitating keys. The cavities formed by the holes in the printed circuit boards are individually sealed and filled with an inert gas or dielectric fluid. When pressing the dome-shaped protrusion, an elastic layer with conductive zones closes the contact group through the hole in the top printed circuit board. In this case, the inert gas or dielectric fluid is displaced into the opening in the lower printed circuit board and stretches the damping membrane. When released, the dome-shaped protrusion and the damping membrane return to their original position. Changes in external pressure are compensated by changing the shape of the damping membrane. Changes in the shape of the dome-shaped protrusions when this is insignificant and do not affect the normal operation of the keyboard. 1 hp f-ly, 7 ill. I cl

Description

I

Csch1G) refers to 1PT11MPtick and compute the type of -s-hicr and can be used on control panels that are equipped with a number of very powerful machines and telephony.chpony complexes installed on underwater and aerial devices on aerial devices, on aerial vehicles, on aerial vehicles.

The purpose of the invention is to increase the reliability of the keyboard by eliminating the possibility of false alarms1 {with changes in external pressure and eliminating contact oxidation.

FIG. 1 shows the keyboard, a general view; in fig. 2 - then ЖР, cross section; in fig. 3 - to clarify the prince's work of the valve; in fig. 4 - an explanation of the nature of the external pressure difference between the external pressure and the pressure pressure when the pressure luioinnee is higher than the intraclavicle j in FIG. 5 - an explanation of the principle of compensation of the difference between external and in-valve pressure when the external pressure is lower than the pressure inside; in fig. keyboard, simplified version of the implementation; in fig. 7 - installation of a standard keyboard head, an example.

TSpaviatura contains a base 1 of dense elastic material, dome-shaped protrusions 2, imitating keys, a second printed board 3 with contact groups (and holes 5, the first printed circuit board 6 with holes 7, an elastic layer 8 with progressive zones 9, the damping membrane 10, the upper 1 1 and the lower 12 parts of the individually sealed cavity formed by the orifices 5 and 7, with a simplified version of the design, the body 13 with ok 14 or the gasket 15 with the holes 16;

The keyboard works in the following way.

In the initial state, contact groups 4 are open (phi1. 2). When you press the key 2, the E1N1N1-1Y of the Lay 8 with the adjacent zones 9 bends and through the opening 7 in the printing board 6 closes the contact1 rpynniji 4 (() ig. 3). Tripping occurs when any two (1 hO) hgak gov is closed. The EcJni flexible H is conductive along Hceii posg p-Pusti, it is both FjHO projectile with a common contact of contact guiii 4 of board 3 with RISUNK 1M rif L, PL10Y P. CHLTA 6.

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P t1 (nt press the key for x (inert eye and dielectric fluid), which is located in the R cavity 11 of the key 2, exits through the hole 5 and the cavity 12. At the same time, the membrane 10 expands. Dp minimizing the volume of the cavity 12 in plate 3, cone-shaped depressions could be made.

When pressing the key, there is no sharp falling of the protrusion 2 (cotton), since the air escaping through the opening 5 from the cavity 1 into the cavity 12 creates resistance to preventing clapping, which ensures better smoothness of the key stroke; 1I.

When you release the key, it returns to its original position. The contact groups 4 in this case are the 7L cabins. At the moment the key returns to its original position, the air under pressure from the stretched membrane 10 from cavity 12 through the opening 5 returns to cavity 11. The stretched membrane 10 creates an additional force that facilitates the return of the key B to the initial position,

The principle of operation of a keyboard filled with an inert gas or liquid dielectric is similar. The magnitude of the working stroke of key 2 is determined by the thickness of the printed circuit board 6 and the height of the projections of the base 1 and may be 0.2-3 mm. The actuation force of the keys depends on the thickness and elasticity of the moving elements and is 50-100 g. The height of the keyboard is 2-5 mm, depending on the thickness of the materials used and the height of the projections.

The keyboard provides for the suppression of parasitic oscillations of the keys that occur under the influence of shocks and vibrations and lead to false positives of the contacts. Most often, these phenomena occur at the frequency of the keyboard's own resonance, when the amplitude of spurious oscillations of the key is sharp

increases

With a sharp movement of the key down (up), air through the opening 5 leaves cavity II (1 2) into cavity 12 (1 I creating a resistance proportional to the speed of movement of the key, causing its movement to slow down. It follows from the above that DEMP3 is provided

Forming and calming down parasitic oscillations of the headpiece, which makes the structure more vibrant and resistant and ensures the stability of work 1 under conditions (and its vibrations and shock.

Under the action of an external pressure exceeding the intraclavicular (Fig. 4) elastic membrane 10 adapts to the cone-shaped recess of the board 3, reduces the volume of the cavity 12, squeezing out a part of the air to the cavity 11 until the pressures in the cavities 11 and 12 do not compare and become equal to the outside. At the same time, ociio 1 for 1 wire is searched by layer 8 and it bends to an insignificant amount that does not affect the function of the keyboard. The magnitude of the deflection is the smaller the thinner and more elastic the damping membrane 10 in comparison with the base 1 and the conductive layer 8.

When using a keyboard in a liquid, including at great depths, where there is an increased pressure, the internal volume of the keyboard is filled with a dielectric fluid, which, having a small degree of compression, protects the design from large deflections of moving elements and spontaneous contacts.

When the keyboard operates in an environment with reduced pressure (Fig. 5), as a result of the effect of intra-keyboard pressure exceeding in this case, the external, elastic membrane 10 expands, increasing the volume of cavity 12. Air passes through hole 5 from cavity 11 to cavity 12 by increasing the internal volume of the cavity 12 and redistributing the air between the cavities 11 and 12, the pressures in the cavities 11 and 12 h external become equal. In this case, the base 1 with the conductive layer 8, as in the previous case, does not practically change the initial position.

In a simplified version of the design (Fig. 6) For the manufacture of all parts, sheet materials are used that are commercially produced by industry, therefore, there is no need to develop and manufacture expensive molds and complex technical equipment. In order to increase the mechanical strength of the structure and to separate the keys 2, the body 13 is inserted with the windows 14 of the D.PI keys. To increase the volume of the cavity 12 ispol, the gasket 15 with holes 16 is provided.

If necessary, you can use the EE to press the keys 2 standard, 1st key heads 17 (Fig. 7).

Individual sealing of the cavities II and 12 is provided by gluing or curing the layers 1, 8, 6, 3 and 10 to each other over the entire contact area.

The base 1 and the elastic layer 8 can be made of IRP-1265 silicone rubber, the wire from the zone is made of conductive rubber (SET elastomer), the membrane 10 is made of silicone compound 159-167, or from IRP 1265.

Thus, sealing the keys and introducing a depremeating membrane allows using the keyboard in a wide range of external pressures, increasing the keyboard's resistance to sudden drops in external pressure, improving the smoothness of the key travel. Filling the hermetic cavities with an inert gas or a liquid dielectric makes it possible to eliminate oxidation of the contacts.

Claims (2)

Invention Formula 1. The keyboard, containing a base of dense elastic material, has dome-shaped protrusions on the front of the base, imitating keys, an elastic layer with conductive zones located on the lower side of the front of the base, the first printed circuit board with holes located opposite the dome-shaped protrusions of the front the base part, the second printed circuit board with openings located opposite the dome-shaped protrusions of the front part of the base, the second printed circuit board with openings located opposite to base protrusions, contact groups located on the upper side of the second printed circuit board opposite the dome-shaped protrusions of the front part of the base, the first printed circuit board is located between the elastic layer with conductive zones and the second printed circuit board, characterized in eliminating the possibility of false alarms when pressure changes externally; And eliminating contact oxidation, the keyboard contains a damping membrane located between H jix boards, individually sealed. 2. The keyboard of claim 1, p. 1 and h au III and so that the cavities the second printed circuit board and rear valve are filled with a liquid dielectric of the base, cavities formed by a rick or inert gas under pressure in the first and second printings of BF ii; i.e., atmospheric, H jix boards, individually sealed. 2. The keyboard of claim 1, about the third and third, so that the hollows valve valves filled with liquid or inert gas BF ii; ie, atmospheric, 1 FIG. FIG. 25 ff Yu ten Editor P.Gepsh Compiled by V. Fayzrakhmanov Tehred A. KravchukKorrektor S.Shekmar Order 2864/44 Circulation 672 Subscription VNIIPI USSR State Committee on inventions and discoveries 113035, Moscow, L (-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 (rig. 7