SU1672432A1 - Switchboard for characters input device - Google Patents

Abstract

The invention relates to automation and computing and can be used to read and enter symbol information into a computer. The purpose of the invention is to improve the reliability of a patch panel for a character input device by simplifying it. The switching panel contains a matrix of switching elements made in the form of inductive-capacitive elements on a printed circuit board, and contact pads. The switching panel is double-layered, and the inductive-capacitive elements have a loop-like linearly extended form and in the first layer of the printed circuit board are oriented along the columns of the matrix of switching elements, and in the second layer - along the rows of the matrix of switching elements

inductive-capacitive elements are connected in a certain way with groups of conclusions. 1 hp f-ly. 5 il.

Description

The invention relates to automation and computer technology and can be used to read and enter symbolic information (characters, numbers, etc.) into a computer.

The aim of the invention is to increase the reliability of the patch panel by simplifying it.

FIG. 1 is a printed wiring pattern of the first layer of the patch panel; FIG. 2 is a printed wiring pattern of the second layer of the patch panel; FIG. in FIG. 3, the combined pattern of the layers of the switching panel in FIG. 4 is a storage medium with input characters and characters; figure 5 - cross section of the switching panel.

The switching panel is made in the form of a double-sided printed circuit board made on the basis of a two-sided foiled dielectric.

The first layer 1 of the printed circuit board (see Fig 1) and the second layer 2 of the printed circuit board (see figure 2) contain loop-shaped inductive-capacitive elements 3 whose internal coils are connected to the contact pads 4 of the first group of terminals (on the first layer 1) and to the contact pads 5 of the third group of conclusions (on the second layer 2)

The outer turns of loop-shaped inductive-capacitive elements 3 are connected respectively to the contact pads b of the second group of conclusions (on the first layer 1) and

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to contact pads 7 of the fourth group of conclusions (on the second layer 2).

On each layer of the printed circuit board between the loop-shaped inductive-capacitive elements 3 there are screening busbars 8 connected to the terminal of zero potential (not shown).

Fig. 3 shows a combined pattern of two layers of a printed circuit board, from which it can be seen that when applying loop-shaped inductive-capacitive elements, a matrix of switching elements is formed. The positions of each symbol in the matrix are limited by a grid of shielding buses 8, the purpose of which is to reduce the mutual influence of neighboring inductive-capacitive elements 3 on each other during operation.

It is necessary to take into account that FIG. 3 is illustrative, as it depicts only the relative position of the printed elements of layers 1 and 2 in the printed circuit board, which are in different planes (see Fig. 5).

The drawing indicates: d - the size of the position of the character in the column (row) of the matrix;

n is the number of character positions;

AN and L, respectively, the dimensions of the initial and final edge zones of a loop-shaped inductive-capacitive element, whose length is determined by the expression

n Xd + AN + Ak

The marginal zones AH and Ah are not included in the working area of the panel, since the conditions of work in them are different from the zones where the symbols are located.

Fig. 4 shows an information carrier 9 made on a thin dielectric material (a sheet of film or paper), in which the characters corresponding to the intersection of the columns and rows of the matrix show the input characters, numbers and signs.

The sectional switch panel is presented in Fig. 5, from which it can be seen that the information carrier 9 fits snugly to the first layer 1 of the printed circuit board. Between layers 1 and 2 of the printed circuit board there is a layer 10 of a dielectric material (the board is made on the basis of a double-sided folded dielectric), in which metallized holes 11 are made to connect the groups of terminals of the switching panel to the device for symbol input (not shown).

The design and operation of the device for inputting characters is similar to the design and operation of the known device.

The patch panel works as follows.

A high-frequency voltage is constantly connected to the contact areas 4 and 5 of the first and third groups of terminals, the frequency of which is determined by the natural frequency of the oscillating circuit formed by the resulting inductance and the resulting capacitance of the inductive-capacitive element 3.

In this case, contact pads 6 and 7 of the second and fourth groups of terminals alternately connects a constant supply voltage, the frequency of which is connected

5 is many times less than the natural frequency of the oscillating circuit formed by the inductive-capacitive element 8.

As a result, in all inductive-capacitive elements 3 layer 1 or layer 2

0, oscillations occur with a certain amplitude determined by the active component of element 3 (the ohmic resistance of the printed loop conductor).

5 When a symbol, located at the intersection of the loop-like windings of elements 3, is inserted into a position of a read element, which may be, for example, a pencil with a tip from a soft magnetic material, the reactive parameters L and C of the corresponding inductive-capacitive elements 3 change.

In this case, the resonance condition in the oscillating circuit is not fulfilled and the amplitude of the 5th signal of the variable component at the corresponding outputs of the first 4 and second 5 groups of terminals varies, which is fixed by the information input device circuit, where these signals are formed

0 into binary signals and decoded into the code of the corresponding character.

The proposed switching panel is more reliable than the known construction, since with the same number of

with. The characters entered are 8 x 8 64. The number of layers of a printed circuit board in a known design is four, and in the proposed one two. The number of pads and metallized holes in the known switching panel is 96, and in the proposed one - 32. The known switching panel has a large number of spiral inductive elements (256 by 4 layers) that are difficult to manufacture.

The implementation of inductive-capacitive elements in the form of loop-shaped printed conductors located on two layers of the printed circuit board, reducing the number of pads and plated holes significantly increases the reliability of the 5

switch panel compared with a known technical solution

Claims (2)

1. A patch panel for a character input device containing a matrix of switching elements made in the form of inductive-capacitive elements located on a printed circuit board, the corresponding areas of which are the contact pads of four groups of terminals differing from that. that, in order to increase the reliability of the switching panel due to its simplification, the printed circuit board is double-layered, and the inductive-capacitive elements are loop-shaped linearly-extended, with the looped inductive-capacitive elements in the first layer of the printed circuit board , in the second layer of the printed circuit board, loop-shaped inductive-capacitive elements are oriented along the rows of the matrix of switching elements, the switching elements of the matrix are located in areas of Cheney looping inductive capacitive elements of the first and second layers of the PCB, the length of loop inductances capacitive elements is determined by the expression and X d + Li + L. where n is the number of character positions located on a column or row of the matrix: d is the size of the position of the character in the column or row of the matrix; / (and / V - respectively, the dimensions of the initial and final edge zones of the loop-shaped inductive-capacitive element, the contact areas of the first and second groups of conclusions are located along one side of the switching panel in the direction of the x-axis, the contact areas of the third and fourth groups of conclusions are located along the other side switching panel in the direction of the axis of ordinates, the contact pads of the first and third groups of conclusions are located inside loop-shaped inductive-capacitive elements and are connected to their internal turns, in external turns of loop-shaped inductive-capacitive elements are connected respectively to the contact pads of the second and fourth groups of conclusions 2. The panel in accordance with claim 1, which means that in each layer of the printed circuit board between the loop-shaped inductive-capacitive elements are shielded busbars connected to the tire of zero potential. /////// 171/1/1/1 6 i 6 f 6 6 46 1 64 6 Central Bank Phage.  ::,: &. -jlfefi:; ::: shchsch,.: l. ;, sg " eleven G WW Ch g 1 g g ii FIG. four / II  I I .1 10 L2