SU807353A1

SU807353A1 - Graphic information reading-out device

Info

Publication number: SU807353A1
Application number: SU782660919A
Authority: SU
Inventors: Виталий Максимович Белов; Владимир Васильевич Богданов
Original assignee: Специальное Конструкторское Бюронаучного Приборостроения Co Ah Cccp
Priority date: 1978-08-21
Filing date: 1978-08-21
Publication date: 1981-02-23

Description

1one

Изобретение относитс к автоматике и вычислительной технике, в частности к устройствам дл считывани графической информации.The invention relates to automation and computing, in particular to devices for reading graphic information.

Известно устройство дл считывани графической информации, которое содержит планшет с взаимно перпендикул рными токопровод щими рамками, подключенными к коммутаторам, счетчики координат, генератор одиночных импульсов, соединенный с установочными входами счетчиков координат и блока управлени , подключенного ко входам коммутаторов и счетчиков координат , съемник информации, свлэанный с рамками планшета и блок определени поправки. Съемник информации этого устройства выполнен в виде концентрически расположенныхкольцевых обмоток, подключенных ко входам блока определени поправки l Однако така конструкци съемника довольно сложна, а точность считывани координат этого устройства недостаточно высока. Она определ етс рассто нием между соседними кольцевыми обмотками съемника информации. Кроме того, обмотки имеют разные диаметры и, следовательно, отличаютс их параметры, что приводит к погрешност м . в этом устройстве разница радиусов внешней и внутренней обмо-1 ток съемника информации равна рассто нию между соседними шинами на планшете, что ограничивает возможность упрощени конструкции планшета за счет увеличени рассто ни между шинами.A device for reading graphic information is known which contains a tablet with mutually perpendicular conductive frames connected to switches, coordinate counters, a single pulse generator connected to the installation inputs of coordinate meters and a control unit connected to the inputs of switches and coordinate counters, an information remover, attached to the frame of the tablet and the unit for determining the amendment. The information puller of this device is made in the form of concentrically located ring windings connected to the inputs of the correction definition unit l However, such a puller structure is rather complicated and the accuracy of reading the coordinates of this device is not high enough. It is determined by the distance between adjacent ring windings of the information remover. In addition, the windings have different diameters and, consequently, their parameters differ, which leads to errors m. In this device, the difference between the radii of the external and internal demo-1 current information remover is equal to the distance between adjacent tires on the tablet, which limits the possibility of simplifying the design of the tablet by increasing the distance between the tires.

Наиболее близким по технической The closest technical

0 сущности к предлагаемому вл етс устройство, содержащее планшет, выполненный в виде системы двух взаимно ортогональных, координатных шин, соединенных с первым коммутатором, 0 to the essence of the invention is a device comprising a tablet made in the form of a system of two mutually orthogonal coordinate buses connected to the first switchboard,

5 блок управлени , подключенный к первому и второму коммутаторам, к одним входам счетчиков координат, другие входы которых соединены с генератором импульсов, подключенным 5 a control unit connected to the first and second switches to one input of the coordinate meters, the other inputs of which are connected to a pulse generator connected

0 к коммутаторам, и съемник координат 2 .0 to switches, and a coordinate remover 2.

Недостаток заключаетс в малой точности устройства.The disadvantage is the low accuracy of the device.

Цель изобретени - повышение тбч5 ности устройства.The purpose of the invention is to increase the TB of the device.

Поставленна цель достигаетс тем, что оно содержит цифроаналоговый преобразователь, соединенный с блоком управлени , блок формировани опорных сигналов, подкл1эченный коThe goal is achieved by the fact that it contains a digital-to-analog converter connected to the control unit, a unit for generating reference signals, connected to

Claims

0 to the second switch, to the digital-to-direct converter and to the tablet coordinate buses, and the comparison unit whose inputs are connected to the coordinate remover and the reference signal generation unit, and the output connected to the control unit. The reference signal generating unit contains the first signal sensor inductively connected to the second signal sensor and to the system of additional conductors laid in frames on the auxiliary plate. The second signal sensor is made in the form of a frame, one end of which is connected to the input of the reference signal generation unit, and the second is grounded. The drawing shows a block diagram of the device. The device contains a tablet 1, the first switch 2, the first counter of the 3 coordinates, the digital-analog converter 4, the second switch 5, the second counter of the coordinates b, the remover of the 7 coordinates, the third counter of the 8 coordinates, the comparison block 9, the control block 10, the pulse generator 11 , a reference signal generating unit 12, comprising a first sensor of signals 1, a second sensor 14 of signals, a system of additional conductors 15. The device works as follows. A single pulse generator 11 generates a pulse when the removal button is pressed, which is supplied to control unit 10, the first, second and third counters 3, 6 and 8, and the first and second switches 2 and 5. At the same time, all counters are reset to zero. The control unit 10 generates a series of clock pulses fed to the counter 3 and the switch 2, which provides a serial connection of the coordinate frames to the zero potential bus. All the frames of block 12 and the frame of the tablet form a series circuit. The switch 5 is set to the zero state by the initial pulse of the generator 11 of single pulses at which one and the same zero frame of block 12 is excited, the amplitude of the emf induced in the sensor 13 of the reference signals is minimal. With the help of switch 2, the frames of tablet 1 are alternately connected to a serial circuit with a zero frame of block 12. As soon as the switch 2 connects the frame, in the zone where the puller 7 coordinates are located. 13 of the reference signal and the comparison unit 9 will generate a positive pulse, according to which the trigger of the control unit 10 changes its state. The selected tablet frame remains connected to the zero potential bus, and in the counter 3 a number is fixed that defines the X coordinate with the accuracy of the tablet frame pitch. The control unit generates a pulse on which the switch 5 connects the next frame of the block 12, corresponding to the maximum amplitude of the EMF in the sensor 13 of the reference signal and generates a sequence of clock pulses simultaneously arriving at the second counter 6 and the second switch 5 block 12. The amplitude of the electromotive force in the sensor 13 of the reference signal will be gradually reduced by connecting more and more distant from it the frames of block 12, and as soon as it becomes less than the amplitude of the EMF in the puller 7 coordinate Inat, Comparison Unit 9 is triggered a second time. The control unit 10 will fix the state. the switch 5 and the counter b, which contains the X-coordinate correction with the accuracy of the pitch of the block 12. Using the digital-to-analog converter 4 and the second sensor 14, the tablet floor is further sampled. The frame of the second sensor 14 is included in such a way that the current pulse in it reduces the resulting EMF in the sensor 13 of the reference signal. In the process of preliminary determination of coordinates with frame pitch accuracy, control unit 10 sets the maximum code at the input of the analog-digital converter corresponding to the maximum pulse amplitude at the analog output. After the control unit 10 fixes the selected frame of block -15, a zero code is set at the input of the digital-to-analogue converter 4, which corresponds to a zero signal at its output. If block 9 compares for the third time, the process of measuring the X coordinate is completed. Otherwise, successively increasing binary codes are fed to the converter 4 input, and clock pulses to the input of counter 8 until a positive pulse appears at the output of the comparison block 9 for the third time. The control unit 10 fixes all the counters and the process repeats similarly for the coordinate Y. The introduction of new blocks and new structural links has significantly improved the accuracy of the device. Claim 1. A device for reading graphic information containing