SU424319A1 - DEVICE FOR DETERMINING THE ORIENTATION OF ELEMENTS - Google Patents

Description

one

The invention relates to devices for determining the orientation of semiconductor elements in automatic coptrol systems and the production of modular semiconductor devices, in particular microcircuits, diode arrays and transistors, with respect to the contacts of a parameter meter.

An orientation device is known comprising a generator of interrogating pulses, a series-connected pulse counter and a decoder, a contacting device and coincidence circuits.

The purpose of the invention is to reduce the inspection time of elements. This is achieved by the fact that a device for controlling the absence of contact is included in the proposed device, which is included between the output of the end of the decoder's account and the outputs of the joint schemes.

The drawing shows a block diagram of the proposed device.

The device consists of a generator of 1 interrogating pulses, a counter of 2 pulses, a decoder 3, a test element 4, a contacting device 5, a matching circuit 6-9 and a no contact control circuit 10, which in turn consists of an OR 11, two flip-flops 12 and 13 and schemes 14 match. In the circuit 10, the inputs of the circuit 11 are connected to the outputs of the circuits 6-9, match the output, connected to the trigger input 13, one of the trigger inputs 12 is connected to the output of the descrambler counting end, the remaining inputs of each of the triggers are combined and reset,

flip-flops 12 and 13 are connected to the inputs of a matching circuit 14.

The control circuit of the absence of contact works as follows.

In the initial state at the output of the trigger

12 "Oh, at the output of the trigger 13" 1. For “1, they take a high level of voltage, for“ O, a low one.

In the presence of contact of the tested semiconductor element with the contacting

the device and the detection of the conductive channel at the output of the circuit "OR a pulse is generated that flips the trigger 13, as a result, at the output of the trigger 13 appears" O. The trigger 12 is transferred by the end of count pulse from the decoder 3 (the last polling pulse) and appears at its output "1. On the output of circuit 14, the signal does not appear, since there are no coincident pulses on its inputs.

In the absence of contact of the tested semiconductor element with the contacting device at the output of the circuit OR there is no impuls, the trigger 13 remains in the initial state, at its output remains I. The trigger 12 is thrown back by the impulse termination pulse of the decoder, at its output appears " 1. As a result, a pulse coincidence occurs at the inputs of the circuit 14, and a signal appears at its output, indicating that the tested semiconductor element is not in contact with the contacting device.

A reset is provided to return the triggers to the initial state. Depending on the specific application of this logic device, a reset can be made manual or automatic.

Subject invention

A device for determining the orientation of elements, containing a generator of interrogating pulses, serially connected pulse counters and a decoder, a contacting device and coincidence circuits, distinguishes itself with the fact that, in order to reduce the time for checking elements, it additionally has a no contact control circuit included between the output of the occipher of the decoder account and the outputs of the matching circuits.