SU879830A1

SU879830A1 - Printed circuit board testing device

Info

Publication number: SU879830A1
Application number: SU802883882A
Authority: SU
Inventors: Анатолий Павлович Хрущев; Абрам Хаймович Абрамович; Виталий Алексеевич Панченко; Герман Германович Лукашенко; Григорий Янкелевич Шойхет; Александр Давыдович Столяр
Original assignee: Предприятие П/Я М-5774
Priority date: 1980-02-11
Filing date: 1980-02-11
Publication date: 1981-11-07

Description

Изобретение относится к радиотехнике и может быть использовано для автоматизированного контроля электрических печатных плат.The invention relates to radio engineering and can be used for automated control of electrical printed circuit boards.

Известно устройство для измерения электрических параметров печатных плат,⁵содержащее основание, контактный блок с рядами контактных элементов, прижимной механизм печатной платы с пневматическим приводом, двухкоординатйый программно-управляемый шаговый привод и измерительный блок, соединенный с контактным блоком. Контактные элементы контактного блока перемещаются параллельно плоскости проверявмой платы с помощью поводкового патрона, закрепленного на двухкоординатном приводе. Поводковый патрон перед замыканием контактов последовательно отыскивает координаты, находящиеся в состоянии покоя испытательных штифтов, входит с ними в замыкание и переносит их в места контактируемых ими точек [1].A device for measuring electrical parameters of printed circuit boards, ⁵ comprising a base, a contact block with rows of contact elements, a press mechanism of a printed circuit board with a pneumatic drive, a two-coordinate program-controlled stepper drive and a measuring unit connected to the contact block. The contact elements of the contact block are moved parallel to the plane of the circuit board using a lead-in chuck mounted on a two-axis drive. The lead cartridge before closing the contacts sequentially searches for the coordinates that are at rest of the test pins, enters into the closure with them and transfers them to the places of the points they contact [1].

КОНТРОЛЯ ПЕЧАТНЫХ ПЛАТPCB CONTROL

Замыкание контактов происходит при ---- · · срабатывании прижимного механизма.Contact closure occurs when ---- · · triggering the clamping mechanism.

По окончании цикла проверки плата от1 водится от испытательных штифтов,которые затем возвращаются в исходное положение под действием пружин.At the end of the test cycle, the board1 moves away from the test pins, which then return to their original position under the action of the springs.

Недостатком известного устройства является сложность конструкции изза необходимости перестройки контактного блока. Кроме того, большое число перемещений, необходимое для полной проверки печатной платы, приводит к увеличению времени контроля и снижению надежности проводников,соединяющих подвижные контактные элементы контактного блока с измерительным блоком число испытуемых штифтов контактного блока ограничено возможностью независимого их позиционирования в пределах платы, что приводит к увеличению числа перестроек, времени, необходимого для полной проверки всей целей печатной платы.A disadvantage of the known device is the design complexity due to the need to rebuild the contact block. In addition, the large number of movements necessary for a full check of the printed circuit board leads to an increase in the monitoring time and a decrease in the reliability of the conductors connecting the movable contact elements of the contact block to the measuring unit, the number of test pins of the contact block is limited by the possibility of their independent positioning within the board, which leads to an increase in the number of realignments, the time required to fully verify all the goals of the printed circuit board.

Известно также устройство для ‘Устройство для контроля печатных контроля печатных плат, содержащее основание, контактный блок с рядами контактных элементов, расположенных по одной координате с равномерным и минимальным шагом, прижимной меха-; низм, измерительный блок и механизм перемещения {2].A device is also known for ‘A device for controlling printed circuit control of printed circuit boards, comprising a base, a contact block with rows of contact elements located at the same coordinate with uniform and minimum pitch, a clamping mechanism; low, measuring unit and movement mechanism {2].

Недостатком этого устройства является сложность его конструкции изза большого объема коммутатора опроса и большого усилия прижима, необходимого для надежного контактирования одновременно большого числа контактных элементов к проверяемой Плате. Перемещение контактного блока, соединенного большим количеством проводов с коммутатором, приводит, в конечном итоге, к снижению его надежности .The disadvantage of this device is the complexity of its design due to the large volume of the polling switch and the large clamping force necessary for reliable contacting simultaneously a large number of contact elements to the tested Board. Moving the contact block, connected by a large number of wires to the switch, ultimately leads to a decrease in its reliability.

Цель изобретения — упрощение конструкции и повышение производительности контроля.The purpose of the invention is to simplify the design and increase control performance.

Это достигается тем, что в устройстве для контроля печатных плат, содержащем основание, контактный блок с рядами контактных элементов, расположенных по одной координате с равномерным и минимальным шагом, прижимной механизм, измерительный блок и механизм перемещения, ряды контактных элементов в контактном блоке расположены по другой координате с неравномерным, периодически повторяющимся шагом, расстояние между контактными элементами в каждой последующей паре рядов больше на величину шага координатной сетки, а длина периода расположения рядов контактных элементов вдоль направления перемещения и число рядов в периоде связаны следующим соотношением:This is achieved by the fact that in the device for monitoring printed circuit boards containing a base, a contact block with rows of contact elements located at the same coordinate with uniform and minimum pitch, a clamping mechanism, a measuring unit and a movement mechanism, the rows of contact elements in the contact block are located on another coordinate with an irregular, periodically repeating step, the distance between the contact elements in each subsequent pair of rows is greater by the size of the grid step, and the length of the period is located I rows of contact elements in the direction of travel and the number of rows in the period are related as follows:

А=В(В-1)-И, где А - длина периода в шагах коор_г динатной сетки;A = (B-1) -u, where A - the length of the period in steps _g dinatnoy coordinate grid;

В - число рядов контактных элементов в периоде.In - the number of rows of contact elements in the period.

На фиг, 1 изображен общий вид предлагаемого устройствау на фиг. 2 схема расположения контактных элементов j_ζ на фиг. 3 - конструкция контакт ных .элементов.On Fig, 1 shows a General view of the proposed device in fig. 2, the arrangement of contact elements j _ζ in FIG. 3 - design of contact elements.

плат содержит диэлектрическое основание 1, на котором неподвижно закреплен контактный блок 2 шаговый при5 вод 3 механизма перемещения проверяемой печатной платы 4, направляющие 5, на которых размещен прижимной механизм 6, блок 7 измерения, соединенный с блоком 2 через коммутатор 8.The circuit board contains a dielectric base 1, on which the contact block 2 is steadily mounted, with 5 drives 3, the movement mechanism of the tested printed circuit board 4, guides 5, on which the clamping mechanism 6 is placed, a measurement unit 7 connected to the block 2 through the switch 8.

Ю Подпружиненные контактные элементы 9 расположены в гнездах основания 1 по одной координате с равномерным и минимальным шагом, а по другой координате - в направлении перемещения 15 печатной платы 4 - с неравномерным, периодически повторяющимся, образуя ряды 10, при этом расстояние между контактными элементами в каждой последующей паре рядов больше на вели2Q чину шага координатной сетки.10 Spring-loaded contact elements 9 are located in the sockets of the base 1 in one coordinate with a uniform and minimum pitch, and in another coordinate - in the direction of movement 15 of the printed circuit board 4 - with uneven, periodically repeating, forming rows 10, while the distance between the contact elements in each the next pair of rows is greater by the 2Q value of the grid step.

Ряды 10 в каждом периоде контактного блока расположены так, что попарные расстояния между ними в шагах координатной сетки печатной платы 25 например с шагом 2,5 мм образуют натуральный ряд чисел 1,-2,3,.. и т.д., причем длина одного периода расположения рядов вдоль направления перемещения печатной платы и число рядов в периоде связаны соотношением ³⁰ — А=В В-1 +1 где А'- длина одного периода в шагах координатной сетки;Rows 10 in each period of the contact block are arranged so that the pairwise distances between them in steps of the coordinate grid of the printed circuit board 25, for example, with a pitch of 2.5 mm form a natural series of numbers 1, -2.3, .., etc., and the length one period of the arrangement of rows along the direction of movement of the printed circuit board and the number of rows in the period are related by the ratio ³⁰ - A = B B-1 + 1 where A 'is the length of one period in steps of the grid;

³⁵ Дри пошаговом перемещении проверяемой печатной платы по одной координате относительно контактного блока А шагов обеспечивается проверка лю-? ;бых полярных, сочетаний точек печатной * ⁴⁰ платы. Для обеспечения возможности перемещения платы контактный блок должен быть длинее проверяемой платы на длину одного периода размещения . рядов(А шагов) в связи с чем ряды 10 45 контактного блока образуют, как минимум, два периода. Периодичность размещения рядов 10 в контактном блоке определяется габаритами проверяемых печатных плат. ^{35 For the} step-by-step movement of the tested printed circuit board in one coordinate relative to the contact block And the steps provide verification of ; polar polar combinations of dots * ⁴⁰ printed circuit board. To enable the board to be moved, the contact block must be longer than the tested board by the length of one placement period. rows (A steps) and therefore rows 10 45 of the contact block form at least two periods. The frequency of placement of rows 10 in the contact block is determined by the dimensions of the tested printed circuit boards.

Примеры размещения рядов 10 кон.тактных элементов 9 в одном периоде контактного блока приведены в таблиде.Examples of placing rows of 10 contact elements 9 in one period of the contact block are shown in the table.

879830 6879 830 6

— Число В одном периоде, Б - Number In One Period, B Длина периода (в шагах), А The length of the period (in steps), A Расстояние (в шагах) между смежными рядами в одном периоде для одного из вариантов размещения The distance (in steps) between adjacent rows in the same period for one of the accommodation options Число известных вариантов размещения ря дов в периоде The number of known placement options in a period 1 1 1 1 1 1 1 1 2 2 3 3 1-2 1-2 1 1 3 3 7 7 1-2-4 1-2-4 1 1 4 4 13 thirteen 1-3-2-7 1-3-2-7 2 2 5 5 21 21 1-5-2-10-3 1-5-2-10-3 1 1 6 6 31 31 1-7-3-2-4-14 1-7-3-2-4-14 5 5 8 8 57 57 1-12-2-6-3-7-22-4 1-12-2-6-3-7-22-4 6 6 9 9 73 73 1-2-4-8-16-5-18-9-10 1-2-4-8-16-5-18-9-10 4 4 10 10 91 91 1-36-2-12-7-8-3-13-4-5 1-36-2-12-7-8-3-13-4-5 6 6 12 12 133 133 1-9-48-2-4-18-5-Г1-3-12-13-7 1-9-48-2-4-18-5-G1-3-12-13-7 18 18

Выбор структуры контактного блока в соответствии с таблицей регламентируется оптимальными условиями контроля (приемлемое время контроля при одновременном значительном снижении объема коммутирующей аппаратуры,определяемом соотношением А;В).The choice of the structure of the contact block in accordance with the table is governed by the optimal control conditions (acceptable control time while significantly reducing the volume of switching equipment, determined by the ratio A; B).

На фиг. 2 изображен контактный блок,состоящий из пяти рядов контактных элементов В=5 .Расстояние между крайними рядами 10 в шагах координатной сетки печатной платы (например .С шагом 2,5 мм)равно длине периода А-21 а расстояние между смежными рядами 10 соответственно равно 1-5-210-3 шагов.In FIG. Figure 2 shows a contact block consisting of five rows of contact elements B = 5. The distance between the extreme rows 10 in steps of the coordinate grid of the printed circuit board (e.g., with a pitch of 2.5 mm) is equal to the length of the period A-21 and the distance between adjacent rows 10 is respectively equal 1-5-210-3 steps.

Механизм 6 служит для прижима проверяемой платы 4 к элементам 9 на время поочередного Цикла проверки и отвода ее на время перемещения.The mechanism 6 serves to clamp the tested board 4 to the elements 9 for the duration of the alternate Test Cycle and its removal for the time of movement.

Работает устройство следующим образом.The device operates as follows.

Между платой 4 и элементами 9 имеется зазор. Цикл проверки начинается с прижима платы 4 к элементам 9. Производится проверка необходимых электрических параметров между теми точками платы 4, к которым подключались элементы 9. Затем плата отводится от блока 2, и привод 3 перемещает механизм 6 с платой 4 на один-шаг вдоль направления перемещения, и цикл повторяется, В каждом цикле проверки устройство управления и блок 7 сравнивают измеренные параметры с заданными и результаты сравнения ( координаты дефектных цепей или состояние параметра iГоден-брак” запоминаются. Проверка всех попарных сочетаний точек платы 4 обеспечивается при перемещении ее от— носительно контактных рядов 10 на А шагов. Механизм 6 с платой 4 по направляющим 5 возвращается в исходное положение, и после установки следующей платы устройство готово к новой ₃₅ проверке. Информация о результатах проверки печатной платы (координаты всех дефектных цепей иди состояние параметра Годен) если не обнаружено дефектов, выводится, например с по₄q мощью алфавитно-цифровой печати. Применение предлагаемого устройства позволяет производить проверку электрических параметров любых типов печатных плат при значительном сокра₄₅ щении объема коммутирующей аппаратуры, .что.достигается указанным расположением контактных элементов в контактном блоке»Between the board 4 and the elements 9 there is a gap. The verification cycle begins with pressing the board 4 to the elements 9. The required electrical parameters are checked between those points on the board 4 to which the elements 9 are connected. Then the board is withdrawn from block 2, and the drive 3 moves the mechanism 6 with the board 4 one-step along the direction movements, and the cycle repeats. In each test cycle, the control device and unit 7 compare the measured parameters with the set ones and the results of the comparison (the coordinates of the defective circuits or the state of the iGoden-marriage parameter are memorized. Check all pairwise readings of the points of the board 4 is provided by moving it relative to the contact rows 10 by steps A. The mechanism 6 with the board 4 along the guides 5 returns to its original position, and after installing the next board, the device is ready for a new test _35. Information about the results of checking the printed circuit board ( coordinates of all defective circuits go to the state of the parameter Good) if no defects are found, it is displayed, for example, with ₄ q power of alphanumeric printing. The use of the proposed device allows to check the electrical parameters of any type of printed circuit boards with a considerable volume contraction ₄₅ schenii switching apparatus .chto.dostigaetsya mentioned arrangement of the contact elements in the contact block "

Ограниченное число перемещений дает возможность упростить конструкцию ;устройства, и сократить время необходимое для полной проверки печатной платы, т.е, достигнуть в конечном итоге большой производительности при меньших капитальных затратах.A limited number of movements makes it possible to simplify the design; devices, and reduce the time required for a full check of the printed circuit board, that is, ultimately achieve great performance with less capital cost.

Claims

(54) DEVICE FOR THE CONTROL OF PCBs The invention relates to radio engineering and can be used for the automated control of electrical printed circuit boards. A device for measuring the electrical parameters of printed boards containing a base, a contact block with rows of contact elements, a pressing mechanism of a printed circuit board with a pneumatic drive, a two-coordinate software-controlled stepper drive, and a measuring unit connected to the contact block are known. The contact elements of the contact block are moved parallel to the plane of the check of the Mri board using a powered cartridge mounted on a two-axis drive. Before closing the contacts, the driver chuck successively searches for coordinates that are in the quiescent state of the test pins, enters the closure with them and transfers them to the points of the points they are in contact. The contacts are closed when the clamping mechanism is triggered. At the end of the test cycle, the board is retracted from the test pins, which are then returned to their original position by the action of springs. A disadvantage of the known device is the complexity of the design due to the need to restructure the contact block. In addition, the large number of movements required to fully check the printed circuit board leads to an increase in monitoring time and a decrease in the reliability of conductors connecting the moving contact elements of the contact block with the measuring unit. The number of test pins of the contact block is limited by their independent positioning within the board, which leads to an increase in the number of rearrangements, the time required to fully verify the entire purpose of the printed date. It is also known a device for controlling printed circuit boards containing a contact block with rows of contact elements j located along one coordinate with uniform and minimum pitch, a pressure Mexa-j base, a measuring unit and a movement mechanism f2J. A disadvantage of this device is the complexity of its design due to the large volume of the interrogation switch and the large clamping force necessary for reliable contact of a large number of contact elements at the same time to the board under test. Moving the contact block, connected by a large number of wires to the switch, ultimately leads to a decrease in its reliability. The purpose of the invention is to simplify the design and increase the productivity of the control. This is achieved by the fact that the device for controlling the furnace. boards containing a base, contact blocks with rows of contact elements located along one coordinate with uniform and minimum pitch, a clamping mechanism, measuring unit and movement mechanism, rows of contact elements in a contact block are located along another coordinate with uneven, periodically the repeating pitch, the distance between the contact elements in each subsequent pair of rows is larger by the step size of the coordinate grid, and the length of the period of the arrangement of the rows of contact elements along the direction is moved and the number of rows in the run-linked by the following relation: (ft-l) 4i, where A - the length of time in the steps of the grid; the number of rows of contact elements in the period, Fig. 1 shows the abundance of the type of the proposed device, Fig. 2 shows the arrangement of contact elements}; in fig. 3 g contact A design design. The device for testing printed circuit boards contains a dielectric base 1 on which contact block 2 is steadily mounted. Mechanism 3 moves the tested printed circuit board 4, guides 5j on which the clamping mechanism 6 is placed measuring unit 7 connected to block 2 via switch 8. Spring-loaded contact elements 9 are located in the sockets of the base 1 along one coordinate with uniform and minimum pitch, and along the other coordinate — in the direction of movement of the printed circuit board 4 — with uneven, periodically repeated p yuschims to form rows 10, wherein the distance between kontaktnmi elements in each successive pair of rows greater the magnitude of the grid pitch. The rows 1 in each period of the contact block are arranged so that the pairwise distances between them in the steps of the grid of the printed circuit board, for example, with a pitch of 2.5 mm, form a natural number row of 1, -2.3, etc., Moreover, the length of one period of arrangement of the rows along the direction of movement of the printed circuit board and the number of rows in the period are related by:,:. B-I +1 where the length of one period in grid steps; in - the number of rows of contact elements in the period. Driving the checked printed circuit board along one coordinate relative to the contact block A. combinations of points of the circuit board. In order to allow the board to move, the contact block must be longer than the tested board for the length of one period of placement of rows (A steps), in connection with which the rows 10 of the contact block form at least two periods. The frequency of placement of rows 10 in the contact block is determined by the dimensions of the printed circuit boards being tested. Examples of the placement of rows 1.0 of contact elements 9 in one period of a contact block are given in the table. The choice of the structure of the contact block in accordance with the table is governed by optimal control conditions (acceptable control time with a simultaneous significant decrease in the volume of switching equipment, determined by the ratio A: c). FIG. Figure 2 shows a contact block consisting of five rows of contact elements. The distance between the outermost rows 10 in the grid steps of a printed circuit board (for example, with a step of 2.5 mm) is equal to the length of the period A-21 and the distance between adjacent p Dami 10 respectively is 1-5-2 10-3 steps. The mechanism 6 serves to press the rotatable board 4 to the elements 9 for the duration of the successive Dickel of the test and to withdraw it for the time of the transfer. The device works as follows. There is a gap between plate A and elements 9. The test cycle starts from pressing the board 4 to the elements 9, checks the necessary electrical parameters between those points of the board 4, which the elements 9 were connected to, then the board retracts from block 2, and the drive 3 moves me5: anism 6 with board 4 to one -step along the direction of movement, and the cycle repeats. In each test cycle, the control unit and block 7 compare the measured parameters with the set AND comparison results (the coordinates of the defective circuits or the state of the Going-marriage parameter are remembered. Checking all pairwise combinations The points of the board 4 are provided when it is moved relative to the contact rows of 10 steps A. The mechanism 6 with the board 4 along the guides 5 returns to its original position, and after installing the next board, the device is ready for a new test. Information about the results of the test of the printed circuit board (coordinates all defective circuits or the state of the parameter GodenU, if no defects are found, are displayed, for example, using alphanumeric printing. types of printed circuit boards with a significant reduction in the volume of switching equipment, which is achieved by the specified arrangement of contact elements in the contact block. The limited number of displacements makes it possible to simplify the design of the device and reduce the time required for a complete check of the printed circuit board, i.e. eventually to achieve high productivity with less capital. Claim 1k A device for controlling printed circuit boards, comprising a base, a contact block with rows of contact elements arranged in a single coordinate with a uniform and minimum pitch a pressing mechanism, a measuring block and a transfer mechanism that is different in order to make it easier. Neither the structures, rows of contact elements in the contact block are located along the other coordinate with uneven, periodically repeating step, 2, The device according to claim 1, which is limited by the fact that the distance between the contact elements in each The next subsequent pair of rows is larger by the size of the grid step, 3. The device in PP 1 and 2 is determined by the fact that the period length 0 is the location of the rows of contact elements along the direction of movement and the number of rows in the period are related by the following relationship: A 6 (fe - 1) 41, where A is the length of rows in steps of the coordinate grid; B - the number of rows of contact elements in the period. Sources of information taken into account during the examination 1. Germany patent No. 2628428, cl. H 05 K 13/08, 1979.

2. USSR author's certificate number 527037, cl. H 05 K 1/04, 1976 (prototype).

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FIG. 2