DE2130389A1 - DEVICE FOR MEASURING VARIOUS CHARACTERISTICS OF ELECTRICAL COMPONENTS - Google Patents

Description

"Device for measuring various parameters of electrical components" The invention relates to a device for measuring various electrical characteristics Components for the measurement of which measurement times of different lengths are required.

For example, the measurement of dynamic characteristic values will be longer Measurement times than required to determine the static characteristic values. With the so far known measuring machines, the cycle time of the machine is based, if Readings with different measurement times had to be determined X according to the longest occurring Measuring time.

It is the object of the present invention to provide a measuring device, in which the cycle time, d. H. the time between the ejection of two successive components passes, based on the shortest measurement time.

To solve this problem, the invention provides that individual measuring heads for the measurement of the characteristic values with the shortest measuring time are provided that, furthermore for the measurement of the characteristic values with a longer measuring time at least one multiple measuring head provided, the cycle time of the multiple measuring head being an integral multiple the cycle time of the single measuring heads and this multiple of the number of the multiple measuring head simultaneously measurable components corresponds, and that at least between the multiple measuring head and the individual measuring heads a buffer for the interim recording the electrical components is provided.

The cycle time of the respective measuring head is made up of the pure Measuring time in this measuring head, the contacting and decontacting time and the added transport time from a preceding measuring head or a buffer in this measuring head together.

A multiple measuring head is understood to mean an arrangement; cu which is made up of a number of measurement recordings and associated measurement recordings; etztS while at the same time on all components located in the Mehtfachxeßkopf the same electrical measured value is determined. In a single measuring head only one Component are measured.

The present invention finds preferred application to one entirely novel Pallschachtautomat, in which the components to be measured are perpendicular from one measuring position to the next lower measuring position. All measuring heads are then arranged vertically one above the other.

In addition, the device according to the invention can also be used as an automatic measuring device be designed with rotating components.

In these machines, the components are in the horizontal plane transported from one measuring position to the next position or into an intermediate magazine.

In a complex device in which different measuring heads with a different number of measurement recordings must be used9 the different measuring heads are preferably chosen so that each measuring head doubles Number of components as the next smallest measuring head can accommodate, with then the cycle time of the larger measuring head is twice as long as in that next smaller measuring head, the number of measuring recordings in the measuring heads thus increases in geometrical order, when the total clock of the automaton is the smallest required measuring time. In practice there will be machines with 1-2-4-8-fold Moßköpfem, 1-4 ß-fold measuring heads, 1-3-6-fold measuring heads etc. goben, the Moßkopf, so too a double or multiple measuring head, @@ un of course several times in a machine be represented. A smaller measuring head is used, based on the direction of flow the Components, preferably arranged downstream of a larger measuring head, so that at the end of the passage of the measuring machine, as a rule, the individual measuring heads are arranged.

In the device according to the invention one leads to each measuring position Infeed chute and a discharge chute from each measuring position into the intermediate magazine. Inlet chute and discharge chute are offset from one another so that disruptions, caused, for example, by the bouncing of the components or

the component carrier occur in the next measuring position could certainly be avoided.

In addition, there are no controlled stops, only fixed stops required, which are each arranged at the lower end of an incidence or discharge shaft are.

The buffer is designed so that it stores the number of im Multiple measuring heads arranged in front of it record simultaneously measured components The device according to the invention is particularly suitable for measuring semiconductor components9 with whom you> probably the stavschen as well as the dynamic measured values should be held. The device is in particular for the measurement of Transistors, diodes and double diodes in small packages are suitable, with the components are held individually in magazine support bodies in such a way that the connecting leads of the components are exposed to any foreign material during the measurement to exclude caused disturbances.

With these components, only the housing head of the component is then available with the magazine carrier body in mechanical connection.

The device according to the invention, its mode of operation and its further The advantageous embodiment is to be described in more detail below on the basis of an exemplary embodiment explained.

FIG. 1 shows the entire machine in a perspective view with the exception of the electrical evaluation and storage units.

The spatial arrangement of a double measuring head results from FIG. an intermediate buffer and a single measuring head.

The measurement sequence over time is shown in FIG. 3 by means of diagrams explained.

FIG. 4 shows a measurement recording in a perspective view for a magazine carrier body, the outer wall of the measuring receptacle for reasons of clarity is partially intended to be transparent.

FIG. 5 shows a magazine carrier body in detail.

FIG. 6 shows, in a sectional view, a measurement recording and a measuring socket and the control mechanism for these parts.

The mechanical part of the measuring machine is shown in FIG This is »mm a new type of chute machine, in which the to measuring components fall from measuring position to measuring position0 The Zauelementes, for example Transistors are preferably arranged in magazine carrier bodies0 These are equipped Magain carriers are stacked horizontally in rails, for example. The rails that make up the ones to be measured Components then in the Automat 26 fall, are preferably on a rotatable disk 27 on the top of the measuring machine attached. One of these rails is above the manhole 5 arranged. This incidence shaft is shaped so that the frame-shaped Nagazin carrier bodies are transferred from the horizontal to the vertical position, in which they fall from position to position through the measuring machine.

Bel .dem embodiment of Figure i are two double measuring heads 2 and 5 individual measuring heads i provided. The measuring heads can be in the form of inserts are used in the machine 26 so that the number of single and multiple measuring heads variable ist0 In each double measuring head there is an electrical core on two components measured simultaneously. These are measured values for their determination a longer measuring time is required. In the case of transistors, for example the noise figure is determined. For this, a measuring time of 750 ms is required, for example, while for measuring static parameters just a pure measurement time of approx. 300 ms is required. Of course, they add up to the measurement times add the contacting and decontacting times as well as the fall times, to get to the required cycle time.

In each measuring head there is a displaceable component for each component to be measured Measurement recording with cushioned contact surfaces for the electrode leads of the electrical Component and as a counterpart a measuring socket with contact pieces for contacting of the electrode leads provided.

The machine also has a motor-driven control shaft, the lift cams 15 drives. Such a lifting curve, which has a raised edge line, is assigned to each measuring head. This lifting curve 15 controls via handlebars 16 and rocker arms 17 the joining and Löip of measurement recording and measurement socket and thus the contacting or. Decontacting process. The design of the lift curve thus determines the cycle time of the measuring head assigned to it.

In FIG. 1, there is a separate one for each measurement receptacle 10 Lift curve 15 provided. In the case of double measuring heads, however, as already indicated, it is sufficient for both measuring recordings combined in the measuring head out a lift curve, since both to be measured components are contacted and uncontacted again at the same time have to. At the lower end of the measuring machine is an ejection and sorting device 29 connected, with the help of which the components according to the evaluation of the Measurement results are ejected into sorting compartments 28 in a connected electrical system will.

FIG. 2 shows the spatial arrangement of the measuring heads better remove. FIG. 2 shows a double measuring head 2 with 2 measuring receptacles 10. Each measuring receptacle can be moved in a horizontal position via the connected rocker arm 17. Above the double measuring head there are two magazine carriers, each with an electrical one Component 3, for example, contain a transistor with three electrode leads. These two support bodies fall through the incidence shaft 6 between the measuring receptacles 10 and the measuring socket with its connecting pieces 14. The depth of fall by a stop 8 is limited. About the rocker arm 17, the measuring recordings are at a corresponding position of the lifting curves shifted to the right whereby the carrier body can also be pushed towards rechX until the electrode leads of the Components are pressed against the contact pieces 14 and the opposite Surface sides of the electrode leads on the contact surfaces sprung with springs 58 11 rest on the measurement receptacle. Since the bearing surfaces 11, for example made of ceramic exist, all are individually dispatched, it is guaranteed that all electrode leads pressed against the contact pieces 14 with the same or almost the same Ax4> pressure After the measurement in the double measuring head is finished, the measurement recording starts again back to the starting position with the magazine carrier body - via the collapse position in addition - be pulled along via the discharge shaft 7. Are the support bodies over reached the discharge shaft 7, which is laterally offset from the incidence shaft 6 is, they fall into the buffer 4, which is also at its lower end is limited by a stop 9.

The lateral offset of the inlet and outlet shafts has the advantage that jamming and overtaking-on the fall path of the carrier body in the measuring machine is practically excluded0 By bouncing open the carrier body can in the inventive Arrangement does not transmit any disturbances to the support bodies lying in the measuring positions will. In addition, the buffers can be used to store the The time taken for the components to fall can be shortened, since now only optimally small drop paths occurrence. For the reason given last, there are also between the individual measuring heads Intermediate storage inserted.

On the underside of the movable part of the measuring receptacle is a Slide 24 attached, the next contacting process in the double measuring head the two components located in the buffer store via the incidence shaft of the following individual measuring head l pushes so that the first component is then in the measurement recording of the single measuring head can fall behind if it just made contact there Element after completion of the measuring process through the discharge shaft the Has left the single measuring head. Since the cycle time of the single measuring head is only half the cycle time of the double measuring head, the buffer is cleared again, when the next two components fall out of the double measuring head. The measurement process is particularly clear from the diagrams in FIG. 3, in which the local situation states are plotted over time.

The two diagrams under a indicate the position of two magazine carrier bodies E1 and E2 in the storage area V. The local positions are designated by 30 and 31. As soon as the incidence shaft above the double measuring head DM is released, they fall two support bodies in accordance with the indicated curves 32 and 33 in the two Measurement recordings of the double measuring head.

The curves 32 and 33 are again at the beginning of the diagrams b and c set in order to continue the spatio-temporal measuring process in more illustrative To be able to represent form. The two are contacted in positions 34 and 35 Components measured during a time of, for example, 750>, ms. This time is required, for example, the noise figure for transistors to investigate.

The indicated rising and falling edges at the beginning and at the end the measuring time indicate the contacting and Ent contacting times. After The two elements E1 and E2 are measured in the double measuring head via the buffer sucked. The case in the intermediate store ZM is indicated by the curves 36 and 37 been. The diagrams d and e indicate the occupancy of the buffer initially lies in both positions of the buffer during a cycle time of the machine one support body each, as indicated by the numbers 38 and 40. Then falls after a cycle time after which the subsequent individual measuring head was cleared, the first element E2 according to curve 43 in the single measuring head and remains there during the measurement time 42. The element E1 is at the same time one step in the buffer fell down and is now in position 39 directly above the single measuring head.

If the element E2 is measured from the plane of the diagram f in the is, according to the curve 44 in the next intermediate storage ZM (diagram g) has fallen, can the element E1 corresponding to the curve 41 slide into the single measuring head and is there during the measuring time in the position 42. When the element Ei falls into the single measuring head, the intermediate storage ZM, which follows the double measuring head, is refilled from the double measuring head at the same time (36, 37, 38, 40).

As can be seen from FIG. 3, the pure measuring time is im Double measuring head approx. 700 - 750 ms, while in the single measuring head a measuring time of approx. 300 - 350 ms is required. In addition, there are the times for contacting and de-contacting the components in the measurement sockets and the fall times. This results in a smallest possible total cycle time of the machine of around 500 ms. The cycle time of a Individual measurement key is therefore if the incidence and failure times are also taken into account , 500 ms, and the double measuring head approx. 1 sec. This leaves a measured one every 500 ms Component the automat, although only for the measurement of a characteristic value 750 ms pure Measurement time are required.

In FIG. 4, a magazine carrier body 18 is about to collapse shown in the measurement recording. The electrical components; in Figure 4 is it is a transistor, are each held in a force-locking manner in a magazine carrier body The side edges of the magazine carrier body 18 have, as can be seen particularly clearly 5 results, guides 19 on 9 with; corresponding guides 20 (Fig. 4) correspond to the measurement receptacle 10.

The magazine> support body is designed in the shape of a frame. In a hollow frame two clamping jaws 49 and 50 (Figure 5) are arranged, one of which is fixed and the other is designed to be movable. Between these two clamping jaws, which means a spring 51 are compressed, the housing head 25 of the to be measured clamped electrical component. The electrode leads 12, for example are in the form of flat bands of two opposite one another Pages freely available. Thus there is an influence on the measured electrical Characteristic values of magazine parts excluded the contacting the electrode leads between the pressure pieces ll, which are made of insulating Material are made, and the contact pieces 14 of the measuring socket are pressed.

According to FIG. 4, the magazine carrier body falls between the measuring receptacle 10 and the measuring socket with its contact pieces 14, the carrier body from the stop 8 is intercepted. The carrier body comes in front of the driver pawl 23 of the two Swing-out side jaws 21 and 22 of the measuring receptacle in the space 55 to lie. The spatial position of the carrier body at this stage is shown in the drawing The dashed basic illustration of FIG. 4a is denoted by 46. This situation corresponds thus also the geometrical position of the incidence shaft in the measuring head. The measuring head is then brought into the contacting position via the rocker arm 17 (FIG. 6). In this case, the measurement receptacle 10 is attached to the fixedly arranged measurement socket 13 (FIG. 6) the contact pieces 14 moved towards.

The pressure stubs 45 of the measuring receptacle push the magazine carrier body into position 47 (dashed illustration in FIG. 4a), in which measurements are taken. Simultaneously the carrier body slips over the driver pawls 23 of the outwardly evasive Side jaws 21 and 22 in space 20. The two side jaws 21 and 22 are held together by a spring 54 (FIG. 6), which at the same time enables lateral evasion This jaw allows. ^ Contacting state, which is also shown in FIG is, the electrode leads 12 are firmly on the individually sprung pressure pieces 11 and with the opposite surface on the fixed contact pieces 14, which are connected to the electrical measuring devices.

When decontacting the rocker arm 17 goes back and pulls the Measurement recording back in the starting position. The driver pawls 23 that the carrier body beyond the starting position (46) beyond the discharge shaft ; is sucked 0 The ejection position is shown in the broken line diagram of the FIG. 4a is designated by the number 48 and corresponds to the spatial position of the discharge shaft match. The basic illustration of FIG. 4a shows the three different positions very clearly 46, 47 and 48, which the component or the magazine carrier body when inserted in occupies the measuring head, when making contact and when ejecting.

In FIG. 4, the slide 24 can also be seen, which is on the underside of the movable part of the measuring receptacle 10 is attached. With this slider will the magazine carrier body from the intermediate store during the next contacting process of the measuring head pushed over the inlet shaft of the next measuring head.

The position of the magazine carrier body can be seen particularly clearly from FIG 18 in the contacting position. With a corresponding position of the lifting curve can the handlebar 16 dodge down again and the rocker arm 17 is with the help of Peder 56 brought back to its starting position, where he attached the movable Takes part of the measurement recording into the de-contacting position or the ejection position, In FIG. 6, the position is shown in dashed lines, that of the carrier body 18 after decontacting. In this position, the carrier body falls behind down into the cache. The measurement recording is mechanical in a fixed part 53 Mounted The measuring socket essentially consists of an insulating plate with centering jaws 57, which the side edges of the housing head of the component to be measured grasp and bring into the correct position opposite the measurement receptacle. Through the insulating plate the three contact pieces 14 are guided isolated from one another. The number of contact pieces is of course dependent on the type of components to be measured.

It can be reduced to two for single diodes and for multiple diodes or can be enlarged in the case of other electrical components as required.

The measuring device according to the invention can also be used to measure components used that are not housed in magazine carriers0 In this Case, the device with appropriate guides will meet the needs adjustedO The device according to the invention is characterized by extremely short cycle times and enables the measurement of an optimal number of electrical components in the time unit. By linking the combined multiple and single measuring heads With the completely new chute principle, transport mechanisms could be saved and the transport times required between individual measurement processes are extremely short being held. Through the staggered inlet and outlet shafts the system was made fail-safe. The measuring device according to the invention draws are thus characterized by economy and simple construction.

Claims (17)

P a t e n t a n s p r ü c h e 1) Device for measuring various parameters of electrical components, measurement times of different lengths are required for their measurement, characterized in that that single measuring heads (i) are provided for measuring the characteristic values with the shortest measuring time are that, furthermore, for the measurement of the characteristic values with a longer measurement time, at least one Multiple measuring head (2) is provided, the cycle time of the multiple measuring head being a is an integer multiple of the cycle time of the individual measuring heads and this multiple corresponds to the number of components that can be measured simultaneously in the multiple measuring head, and that at least between the multiple measuring head and the Finzel measuring heads there is a buffer (4) is intended for the temporary inclusion of the electrical components0 2) Device according to claim 1, characterized in that when using various multiple probes that themselves in number at the same time measurable components and in the cycle time differ from each other, each measuring head can accommodate twice the number of components as the next smallest measuring head, in which case the cycle time of this measuring head is also twice as long as that of the next smaller measuring head. 3) Device according to claim 1 or 2, characterized in that all measuring heads (1, 2) are arranged vertically one above the other and that at least one Shaft (5) is provided in which the components (3) from a measuring position to the next lower measuring position. 4) Device according to claim 3, characterized in that at each Measuring position equipped with a single or multiple measuring head (1, 2), the incidence shaft (6) through which the components fall into the measuring position, against the discharge shaft (7), through which the components after the measurement in the buffer (4) or fall to the next measuring position, is offset. 5) Device according to claim 4, characterized in that both the incidence as well as the discharge shaft at its lower end by a stop (8 or 9) is limited. 6) Device according to one of the preceding claims, characterized in that that the measuring heads (1, 2) are arranged so that the components from the multiple measuring head (-2) to the single measuring heads (1) or from a multiple measuring head to the next smaller multiple measuring head with a smaller number at the same time measurable components arrive, 7) Device according to one of the preceding claims, characterized in that the multiple measuring head is a double or quadruple measuring head and the following measuring heads are single measuring heads or a preceding one Four measuring heads are also double measuring heads 8) Device according to claim 1, characterized characterized in that the Zwischen'enspticher (4) is designed so that it has the number the record components measured at the same time in the multiple measuring head arranged in front of it can. 9) Device according to one of the preceding claims, characterized that in each measuring head for each component to be measured there is a displaceable measuring receptacle (10) with cushioned contact surfaces (11) for the electrode supply line (12) of the electrical component to be measured (3) and as a counterpart a measuring socket (13) with contact piece (i4) intended for the contacting of the electrode leads is that there is also a motor-driven control shaft with lift cams (15), the lift curves, one of which is assigned to each measuring head, over Handlebar (16) with rocker arm (17) connected to the measuring receptacle (s) of the measuring head cause the joining and loosening of the measurement receptacle and measurement socket. to) Device according to one of the preceding claims, characterized in that that the electrical components to be measured are each in a magazine carrier body (18) non-positive are held, the side edges with guides (19) are provided, which correspond to corresponding guides (20) of the measuring receptacle (10). 11) Apparatus according to claim 10, characterized in that the Components are held in the magazine carrier body in such a way that the electrode leads (12) are freely accessible from two opposite sides. 12) Apparatus according to claim 8 or 9, characterized in that each measuring receptacle (10) has two resiliently pivotable side jaws (21, 22), between which the magazine carrier body is arranged in the measuring state that this Side jaws are provided with driver pawls (23) behind which the magazine carrier body (18) is pressed when joining the measuring receptacle and the measuring socket and through when releasing the measuring receptacle from the measuring socket of the magazine carrier body the discharge shaft (7) is pulled. 13) Device according to one of the preceding claims, characterized in that that the measuring recordings are provided with a slide (24) through which the in the discharge shaft respectively. Components located in the intermediate storage when assembling the measurement receptacle and the measuring socket pushed over the incidence shaft of the next measuring head will. 14) Device according to one of the preceding claims, characterized through their use to measure semiconductor components. 15) Device according to one of the preceding claims, marked by using them to measure transistors and diodes and double diodes in Small housings, which are taken individually in magazine support bodies in such a way that the Connection leads of the components are exposed and that only their housing (25) is in mechanical connection with the magazine ¢ carrier body, 16) device according to one of the preceding claims, characterized by their use in rotating Measuring machines with a horizontal transport of the components to be measured. 17) Device according to one of the preceding claims, characterized through their use. for measuring static and dynamic parameters. L e r s e i t e