JPS5824945B2 - Double check method for non-defective products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applied to a sorting mechanism that sequentially selects non-defective products from a group of products in orbit through testing.
This invention relates to an improvement in the method for checking non-defective products in the so-called "inclined drop type autohandler J," which is a device that provides a place to automatically and sequentially perform electrical property tests or inspections on IC devices such as ceramic packages.

This type of autohandler is;
An upper loader (1 leader) for installing a track-type container 20 that accommodates C devices 10 in a row adjacent to each other on one track 1 + a track-type container 10 of the same type as described above that accommodates each device a lower unloader (unloader) 2; and an intermediate device that receives a group of devices tilted down from the upper loader and then provides a characteristic testing place for each device in the process of tilting and feeding each device to the lower unloader. The structure includes an inclined track body 3 of the section.

Loader 1. The orbital body 3 and unloader 2 are approximately 4 in this order.
They are assembled with an inclination angle of 0 degrees.

The loader 1 is a conveyor mechanism that has a container mounting surface inclined at the same inclination angle as the track body and can be moved stepwise in a direction perpendicular to the axial direction of the track body.

A large group of containers are loaded on this loader, and when all the storage devices from one container arranged on the same track line as the track body are automatically supplied to the track body by its own weight, the next container is placed on the track line. The conveyor surface of the loader moves one step so that it is disposed on a line.

A gate mechanism 13 controls the timing of sending the device from the container placed on the track of the loader to the track body.

The unloader 2 has an inclined container mounting surface like the loader 1, and is a conveyor mechanism that can move stepwise in a direction perpendicular to the axial direction of the track body.

When one container arranged on the same track line as the track body is filled with a predetermined amount of devices automatically supplied from the track body by its own weight, the conveyor surface moves one step and the next container It is arranged to be transposed on the orbital line and on standby.

The orbital body 3 has the same dimensions as the container.

It has a shaped track 31.

The raceway is an aluminum product with a convex cross section, and it has lead 1.
The device 10 having the device 1 rides on a horse, and the lower surface of the device body slides on the track surface.

Reference numeral 4 denotes a test device attached to the track body 3, which houses various automatic test equipment.

In order to automatically test the electrical characteristics of each device 10 using the equipment of this device, it is necessary to hold each device group at a predetermined location on the orbit for a predetermined period of time. It is necessary to separate the items from the remaining items and hold them so that the remaining items do not fall.

Air cylinders are mainly used for these holding means.

The air cylinder is placed at a necessary location on the track body, and its plunger holds the device body by pressing it from above, or by penetrating the lower end of the device and blocking the device, and by retracting the plunger, the air cylinder holds the device. Functions to remove the hold and release the required device.

The device tested in test apparatus 4 separates into two courses of fire after the test.

That is, the course taken is different depending on whether the device is a good product that passed the characteristic test or a defective product that did not pass the characteristic test.

If it is a good product, the hold is released, the product slides down the track 31, and is stored in the container 10 on the unloader 2 waiting on the axis of the track body 3.

Defective products are held in the test position, and an alarm is activated along with them.

This alarm prompts the operator to remove the defective product and set up the test equipment to handle subsequent devices.

The operations for these two types of courses are performed by automatic control of the device holding means of the track body or the device holding means built into the testing apparatus based on the information of the test results (good product, defective product).

Incidentally, in reality, although it is rare, an inconvenient situation occurs in which even a defective product slips down the track due to a malfunction of the holding means and enters a container that should only contain good products.

Therefore, the reliability of good quality containers is currently low.

If for some reason the operator suspects that a defective product has been mixed into the good container due to such a malfunction, all devices in the good container must be retested by the autohandler at least once. Must be.

This requires a great deal of effort and increases testing costs.

Therefore, it is desirable to have a method that accepts the probability of malfunction and ensures that only perfectly good products are accommodated in the container on the unloader without requiring retesting.

SUMMARY OF THE INVENTION The object of the present invention is therefore to realize an advantageous method that meets the above-mentioned needs.

In short, according to the present invention, all the devices that are released from the test equipment as a result of being checked and descend on the orbit towards the container on the unloader are re-checked before entering the container. A method is provided.

The recheck in this case is not a retest using a test device, but a check based on information on the results of tests that have already been performed.

The mechanism area in which the method of the present invention is implemented is shown in circle D in FIG. 1, and FIG. 2 is an enlarged explanatory view of the main part showing the double check mechanism in this area.

In both figures, 200 is an air cylinder type stopper located downstream of the test apparatus as a device holding means.

This functions in such a way that the plunger of the stopper descends to the raceway surface and blocks the device 10 falling at an angle downstream thereof.

Between the test device 4 and the stopper 200, both a light source (not shown) and a photosensor 210 are connected to the base of the orbital body so that the light from the light source crosses the orbit and is received at an altitude where the device can block the light. It is arranged on the stand 100.

In the above structure, when the device 10A released from the test equipment descends on the orbit across the photosensor 210, the latest test signal representing the test result of whether the product is good or not is sent from the test equipment based on the interruption of light reception by the sensor. A time signal representing the elapsed time from the latest test to the interruption of light reception by the photosensor is transmitted from the test device.

Then, based on the combination of these two types of signals, the stopper 2
00 is driven and controlled as follows.

That is, the stopper is driven and controlled so as to be activated only when receiving a defective product test signal or when receiving a non-defective product test signal and an abnormal time signal to stop the device sensed by the photosensor.

In other words, the stopper is driven when receiving an abnormal time signal, a normal time signal, and a defective product test signal.

There are two types of time signals: a normal signal and an abnormal signal.The normal signal is a time signal that represents the time required for the device released from the test equipment to fall from the measuring point to the photo sensor in a normal state, and the abnormal signal is the It is a time signal representing a drop time that is significantly smaller or significantly larger than the device fall time under normal conditions.

The stopper is not activated when receiving the non-defective product test signal and the regular time signal, thus allowing the device detected by the photo sensor to fall, and as a result, this device is stored in the container on the unloader 2 as a non-defective product. It turns out.

When the stopper is activated, an alarm (not shown) is controlled to be driven based on the activation of the stopper.

Therefore, once the stopper stops the device, the operator can rush to the scene based on the alarm.

The operator removes the stop device to restore normal operation of the autohandler.

The operator can then arrange to additionally store the removed device in another container and undergo the test again along with the untested devices.

The necessity of this retest is due to the following reasons.

The removed device, that is, the device whose advancement is prevented by the stopper, may be a good product or a defective device, and it may not be possible to distinguish between the two.

Photo sensor 210 from the device holding means of the test equipment
There is a possibility, and actually occurs, of abnormal situations where one or more devices stay in the orbit for some reason or decelerate and fall.

Such a stuck device may be rear-ended by the latest device from the test equipment, which is the succeeding device, or the next succeeding device may not be released automatically from the test equipment for some reason. The object starts falling and ends up crossing the photosensor.

In this case, the photo sensor will be reached in a shorter or longer time than the normal elapsed time.

Furthermore, a device that is decelerating and falling will take longer than the normal elapsed time to reach the photosensor.

Therefore, there is no guarantee that the sensor-crossing device at the time of receiving the latest test signal is the device related to the latest test signal.

Devices related to the latest test signal are subject to regular time signals.

Therefore, a device related to a normal time signal and a non-defective product test signal can be recognized as a good product, and a device related to a normal time signal and a defective product signal can be recognized as a defective product. I can do it.

Conversely, a device related to an abnormal time signal cannot be determined as either a good product or a defective product, even if the device is related to a test signal for either a good product or a defective product.

Therefore, the present invention can be said to be a checking method that activates a stopper to prevent a device from being stored in a non-defective container when it is recognized as a completely defective product or when it is doubtful whether the device is good or defective.

The procedure of the method of the present invention described above can be summarized by the block diagram shown in FIG.

According to the present invention, it is only necessary to retest infrequent and therefore few abnormal products, and the reliability that the devices contained in the container on the unloader are good is almost absolute. be.

In addition, as mentioned above, in the case of a device related to a normal time signal and a device related to a defective product signal, an alarm is activated to generate a special alarm to distinguish it from a device suspected of being a defective product. This may allow the operator to discard it without retesting it.

[Brief explanation of drawings]

Fig. 1 is a side explanatory view showing the entire autohandler according to the present invention, Fig. 2 is an enlarged explanatory view of main parts showing the device part according to the present invention, and Fig. 3 is a summary of the procedure of the present invention. This is a block diagram. In the figure, 1 is a loader, 2 is an unloader, 3 is a track body, 4 is a test device, 10, 10A is a device, 13 is a gate mechanism, 11 is a lead, 20 is a container, 31 is a track, 100 is a base, 200 210 represents a stopper, and 210 represents a photosensor.

Claims (1)

[Scope of Claims] I: An inclined track body on which products such as IC devices are placed and the inclined needle falls under its own weight; A testing device that sequentially performs characteristic tests on products on the track; and non-defective products that pass the test are sent downstream of the track body. In a product sorting mechanism that has a good product check mechanism that allows the product to fall from the test device and prevents defective products that do not pass the test from falling to the downstream of the track body; A stopper mechanism for stopping incoming products and a photosensor mechanism for detecting products that have fallen from the testing device are provided on the orbit between the testing device and the stopper of the stopper mechanism; The latest test signal indicating whether the product is good or defective based on the test equipment and the elapsed time spent by the product from the latest test until the sensor detects the product is normal or longer. The stopper mechanism is driven and controlled as follows based on the time signal that indicates whether the result is long, short, or abnormal; (1) In the case of a combination of a normal time signal and a non-defective product test signal, the Niha stopper mechanism is driven. (2) In the case of a combination of a defective product test signal and a time signal, or in the case of a combination of an abnormal time signal and a test signal, drive the stopper mechanism to detect the sensor. Holding the product; a method for double checking non-defective products that is characterized by stiffness. 2 Inclined track body on which IC devices and other products are placed and dropped by their own weight; Test equipment that sequentially performs characteristic tests on products on the track; Good products that pass the test are allowed to fall downstream of the track body; In a product sorting mechanism that has a non-defective product check mechanism that does not allow defective products that do not pass the test to fall downstream of the track body; To park products that have fallen from the test device on the track downstream of the test device. a stopper mechanism, a photosensor mechanism that detects a product falling from the test device on the orbit between the test device and the stopper of the stopper mechanism, and an alarm mechanism that is driven based on activation of the stopper; and a sensor The latest test signal indicating the test result of a good or defective product sent from the test equipment based on the detection of the product and the elapsed time spent by the product from the latest test until the sensor detects the product. The stopper mechanism and the alarm mechanism are driven and controlled as follows based on the time signal representing the abnormal result, which is longer or shorter than that. (2) In the case of a combination of the abnormal time signal and the test signal, drive the stopper mechanism to stop the sensor-sensing product;
In addition, the alarm is activated to issue an alarm indicating that the stopped product is suspected to be defective; (3) In the case of a combination of the regular time signal and the defective product test signal, the stopper mechanism is activated to A method for double-checking non-defective products, comprising: parking a product detected by a sensor, and activating an alarm mechanism to issue a second alarm indicating that the product detected by the sensor is a defective product.