Keyboard

FIELD: electric engineering, in particular, engineering of elements for controlling and commutation of electric circuits, possible implementation for construction of panels for controlling electro-mechanical devices, in form of separate switches, in key-based discontinuous information input devices in form of keyboards.

SUBSTANCE: keyboard has additional number of tension-sensitive elements same to number of keys and having contacts for taking in signals, connected to electronic block for processing signals. Device additionally has joined rigidity element and selector made of elastic material, wherein tension-sensitive elements are positioned, while in electronic block for processing signals function of alternating measurement of signal amplitude is realized, which signal is taken from each tension-sensitive element, value of amplitude is compared to preset threshold value and signal is formed at output, appropriate for pressed key.

EFFECT: prevented false activations and higher reliability of keyboard.

3 cl, 2 dwg

 

The invention relates to electrical engineering, in particular to the control and switching of electric circuits, and can be used in remote control of electrical devices, in the form of separate switches, keyboard input devices discrete information in the form of keyboards.

Known keyboard [German patent No. 4008806. Datengabegerat. Rafi GmbH & Co Elektronische Specialfabrik, authors: Engelhardt G, Borst Joachim, 26.09.91], comprising a housing, first and second plates, two film layers of columns and rows of keys, located between the perforated separator film layer, screwdown mechanisms mounted on the first plate. The downside is that the place of connection of the first film layer columns of keys with a perforated separator film layer, and the last film layer of rows of keys, and the connections of the output slats of these film layers with the input contacts of the second plate is not sealed, which reduces the reliability of the keyboard due to climatic effects and the presence of the contacts of the circuit-breaking that are worn, oxidized, etc.

Known keyboard [RF patent №2134443, G 06 F 3/023, H 01 H 13/70, Appl. 08.07.97, publ. claims 10.08.99], which excluded the impact of climate impacts on the keyboard by sealing the joints between the slats square the night of the layers of columns and rows of keys at their places of contact with the slats of the second plate by pressing them to each other by plates with rubber gaskets and using the vanishing of the external borders of the joints. The downside is low reliability, due to the need of pressing a key of the first film layer columns of keys inside the round hole and the mechanical connection of the contact key, column key contact line, which is accompanied by intense wear and tear film layer and the contacts.

Closest to the technical nature of the claimed device is flat keyboard [RF patent №2025771, G 06 F 3/023, N 03 To 17/96, Appl. 28.08.91, publ. 10.07.99, bull. No. 19], which is hermetically sealed and does not wear contacts. This keyboard is selected as a prototype. It contains a base, a carrier film with the contact of the supports that have piezoelectric elements with pads, and the coating film located on the contact pads of the piezoelectric elements around which lots of cover and carrier tapes are connected via an adhesive layer and form a closed cavity. On the coating film can be set bezel, on the inner surface of which is made excavation in the vicinity of the piezoelectric elements.

The drawback of the prototype low reliability due to the possibility of false positives keyboard. This disadvantage is due to the fact that in the application of the pressure of the efforts of the coating film PR is libalsa and stretches, acting on the piezoelectric elements under the neighboring keys (especially if the point of application of force offset from the center keys), and they all produce signals of different intensity, and, in addition, a rigid base prevents bending (annular support is only possible deflection) of the piezoelectric elements, and the signals taken from them, are weak, which leads to simultaneous signals, most of which are false, on the printed conductors under multiple keys. This disadvantage is aggravated by the presence of tolerance variation of the height of the piezoelectric elements with pads and increases significantly when using rigid front panel keyboard.

The purpose of the invention is to enhance reliability of the keyboard by eliminating false positives.

This goal is ensured by the fact that in the known device, containing testcustomer items by number keys, with contacts for pickup signals, and the base is encouraged to enter an electronic signal processing unit and the element stiffness combined with a selector from an elastic material, which is placed testcustomer elements, with the possibility of bending under the action applied to the key pressure, and their contacts for pickup signal is Ala connected to respective inputs of an electronic signal processing unit. The element stiffness includes a plate with tabs located on the surface of the selector and divided into sections that perform key functions with the possibility of deflection, and in another embodiment, the element stiffness includes the base of the keyboard latches with separators, forming a cavity under each testcustomer element filled with an elastic material selector, the surface of which is divided into sections that perform key functions.

This set of essential features is the introduction of an electronic signal processing unit and element stiffness combined with a selector from an elastic material, which is placed testcustomer elements, with the possibility of bending under the action applied to the key pressure, and their contacts for signal pickup connected to respective inputs of an electronic signal processing unit is new and fully unused, which makes the proposed device meets the criterion for eligibility "world novelty."

In addition, the combination of these features allows you to get a new result, which consists in increasing its reliability by eliminating false positives, especially when the displacement of the pressure force from the center of the keys, and the attainable by means o f the s testcustomer elements in the elastic material of the selector, concentrated transmitting the indicated force with reduced harmful impact on neighboring testcustomer elements, as well as by selection of the electronic signal processing unit from all of the signals received on pins for pickup signal, the useful signal having the greatest amplitude exceeding a predetermined threshold level, which, ultimately, provides an opportunity to consider this device to the relevant eligibility criterion of "inventive step".

We offer the keyboard can be made of known materials and components on the standard equipment used in modern manufacturing. This keyboard can be widely used in electrical industry, instrument engineering, telephony, computing, i.e., it is "industrially applicable".

Figures 1 and 2 are drawings of the structure of the keyboard in two versions, where the following notation: testcustomer, mainly the piezoelectric elements 1, contacts 2 pickup signals, the base 3, the electronic unit 4 signal processing element stiffness 5, a selector 6 of elastic material, the plate 7 of the front panel, the latch 8, the separator 9.

Keyboard (figure 1 and 2) contains testcustomer, mainly piezoelectric elements 1 in the number keys, with contacts 2 for pickup signals, and base 3. It introduced the electronic unit 4 and signal processing element stiffness 5, combined with the selector 6 of elastic material, which is placed testcustomer elements 1, with the possibility of bending under the action applied to the key pressure, and the contacts 2 for pickup signal connected to respective inputs of the electronic unit 4 for signal processing. The element stiffness 5 includes a plate 7 with tabs 8, located on the surface of the selector 6 and divided into sections that perform key functions with the possibility of deflection (figure 1). In another embodiment, the element stiffness 5 includes the base 3 with the tabs 8, provided with a separator 9, forming a cavity under each testcustomer element 1, filled with an elastic material selector 6, the surface of which is divided into sections that perform key functions (figure 2).

The keyboard is as follows. Testcustomer, mainly the piezoelectric elements 1 are placed in the thickness of the elastic material of the selector 6 parallel to its surface. The selector 6 is made either of rubber or the silicone compound or other similar elastic material. In the Annex to the selector 6 of the pressure force P, the surface deforms, latecny material elastically deformed and concentrated, that is, in a small area along the line of application of the vector R, is moved down, passing the corresponding impact on testcustomer element 1. This element or flexes (bends in the middle), if the control force P is applied to the center of the keys vertically (figure 1), or bends around the edge, if the point of application of the pressure force P is shifted relative to the center key (figure 2). The concentration of the move is determined by the elasticity of the material of the selector 6 and the rigidity of the base 3 and allows to solve the problem of mechanical selection effects, namely to bend should only testcustomer element that is closest to the vertical line continuation vector push efforts of R. the Element stiffness 5 contains the tabs 8, the base 3 (figure 2), and (or) plate 7 front panel (figure 1). The clamps 8 are either frame or wall plates around the perimeter. They prevent movement of the selector 6 and the base 3, with which the plate 7 provide rigidity to the whole structure of the keyboard. Plate 7 protects the selector 6 from external mechanical and climatic influences. It is divided into sections that perform key functions with the possibility of deflection at the point of application of the pressure force P (Fig 1). Elastic material selector 6 promotes the selective separation of the human impact testcustomer element 1, including using a plate 7. The separator 9 is made in the form either of tides on the basis of 3 (figure 2)or plate with holes or lattice. If any performance under each testcustomer element 1 is formed a cavity filled with an elastic material selector 6, and the separator 9 additionally concentrate moving elastic material selector 6 in the presence of the pressure of the efforts of R. Thus due to the elastic material of the selector 6 and optional dividers 9 solves the problem of mechanical selection effects with providing the greatest bending of the strain-sensing element corresponding to the pressed key.

Flexural (bending) on testcustomer element 1 occurs the signal. This signal is a voltage pulse, if the piezoelectric element, or the differential resistance, if the piezoresistive element or a load cell. The signal on pins 2 for removal of the signal connected to the corresponding inputs of the electronic unit 4 for signal processing. The block is sequential (multiplex) a survey of all inputs, measurement of amplitude received on each input signal, and then comparing it with a predetermined threshold value. If the signal amplitude exceeds the threshold value, then the signal is considered with the relevant criterion validity. So when narimani key number To a selector 6 is testcustomer element 1 corresponding to the key and produces a bending of the voltage pulse. The neighbouring testcustomer elements can also be signals with insufficient mechanical selection, but with small amplitude due to the smaller bending. Then through the contacts 2 for pickup signal to multiple inputs of the electronic unit 4 selection signals supplied a number of signals, among which only one in the entrance room has the greatest amplitude. This block in turn is a measure of all the received signals and is one whose amplitude exceeded a threshold value. On output, i.e. the Executive, the channel number To the electronic unit 4, is served by a control action defined by the function keyboard. By regulating the threshold value is set to the desired sensitivity of the keyboard in accordance with its purpose. So is e-selection signal amplitude and, as a consequence, the choice of the Executive of the channel corresponding to the pressed key. When narimani the point of application of force may be offset from the center of the keys, which in practice happens quite often especially when using the front panel in the form of a plate. Due to the mechanical with the lectures greatest bending is provided at the strain-sensing element, which is the closest hotel to the pressed key, and using an electric selection selects the input electronic signal processing unit to which the received pulse with amplitude exceeding the threshold value.

Thus, from the foregoing that in the keyboard eliminated false positives and, consequently, increases its reliability. This is achieved due to the additional introduction of electronic signal processing unit and element stiffness combined with a selector from an elastic material. Building selector of elastic material together with separators allows you to implement a mechanical selection of impacts to the provision of the bending of the strain-sensing element corresponding to the pressed key even when the offset applied pressure force from the center of the keys, in the presence of tolerance variation in height testcustomer elements with pads and when using the front panel in the form of a plate. Using electronic signal processing unit electrically selection signals at its inputs and determines the signal amplitude exceeding the threshold value and which is the greatest among the amplitudes of all received signals. Therefore, the mechanical and electrical plant breeding, realizou is installed, respectively, a selector from an elastic material and an electronic signal processing unit, are the reason for the exclusion of false positives keyboard and increasing its reliability.

1. Keyboard containing testcustomer elements according to the number of keys that is capable of bending under the action applied to the key pressure and having contacts for pickup signals are connected to corresponding inputs of an electronic signal processing unit, and a base, characterized in that it introduced the joint element stiffness and the selector from an elastic material, which is placed testcustomer elements, and electronic signal processing unit has a function of alternately measuring the amplitude of the signal produced by each of the strain-sensing element, comparing its value with the specified threshold value and forming the output signal corresponding to the pressed key.

2. The keyboard according to claim 1, characterized in that the element stiffness includes a plate with tabs located on the surface of the selector and divided into sections that perform key functions with the possibility of deflection.

3. The keyboard according to claim 1, characterized in that the element stiffness includes the base of the keyboard latches with separators, forming a cavity under each testcustomer element filled with an elastic material selector, the surface of which section is on the land, performing key functions.



 

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