JPS6041844B2 - Variable resistance board sorting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the resistance value of variable resistance substrates and classifying and sorting them according to resistance value categories.

A resistor substrate used for a variable resistor has a resistor attached to a ceramic or the like by vapor deposition or sputtering, and has a horseshoe shape so that external lead terminals can be connected to both ends. After a resistor is attached by sputtering or the like, a heat treatment is usually performed, but variations in the temperature, time, and other conditions during the heat treatment cause variations in the resistance value. Therefore, it is necessary to measure the resistance value and sort it into several categories according to the accuracy required by the customer. Conventional methods for measuring the resistance value of variable resistance boards
Sorting was done manually by pressing a pair of contact needles connected to a measuring device to both ends of the resistor and placing them into sorting storage boxes according to their resistance values.

Therefore, all work is done manually, resulting in poor work efficiency and the need for more workers, which is a major drawback. Further, the pressure applied when pressing the contact needle against both ends of the resistor varies depending on the operator, and the accuracy of the measured resistance value cannot be trusted.
It is an object of the present invention to eliminate such drawbacks and provide an apparatus that automatically measures the resistance value of a variable resistance substrate and also performs classification and selection.

The invention will now be explained in detail with reference to the drawings.

FIG. 1 shows a variable resistance substrate 1, which is the object of the present invention, in which a resistor 2 is attached in a donut shape concentric with a hole 4 made in the center of the variable resistance substrate 1 and partially cut out at about 90 degrees. The external terminal 3 is in contact with both ends of the resistor 2, has an area centered on the hole 4, and includes an area outside or inside the diameter of the resistor, and is formed by depositing gold or the like. When such variable resistance substrates 1 are transferred in a line, there are a total of eight postures depending on the front and back and direction, from A to C, as shown in FIG.

3 and 4 are diagrams for explaining the principle of the present invention, in which a point 1 approximately in the center of an external terminal 3' connected to the resistor 2 is placed with the diameter slightly larger than the diameter a of the resistor 2 at the top. The contact needle 11 arranged in the same manner, the contact needle 12 similarly arranged at a point (3) approximately in the center of the external terminal 3'', the diameter b slightly larger than the diameter a of the resistor 2, and the contact needle 11 centered on the contact needle 11. A contact needle 13 placed at the intersection point ■ with a circle whose radius is the interval C of 12;
Similarly, the distance C between contact needles 11 and 12 with contact needle 12 at the center
A contact needle 14 is disposed at the intersection (3) of a circle with a radius of Contact needles 21, 22, 23, 24 arranged in the same positions as above and connected to the eight contact needles 11 to 14, 21 to 24,
and a selection circuit 30 that selects two contact needles that are in contact with the external terminal 3 of the resistor 2 from among the eight contact needles, a measurement circuit 40 that measures the resistance value between the selected two contact needles, and a resistor. It is comprised of a determination circuit 50 that discriminates between non-defective products, defective products, and subdivisions of non-defective products according to the values. The principle of the present invention is constructed as described above, so that no matter which direction the variable resistance board 1 is placed and transferred as shown in FIG. It is in contact with the external terminal 3 and the resistance value can be measured. Next, the present invention will be explained in more detail according to the embodiment shown in FIG.

FIG. 5 is a diagram showing an embodiment of the present invention, and FIGS. 6 and 7 are sectional views in which a part of FIG. 5 is enlarged. In FIG. 5, a transfer mechanism 70 that intermittently transports the variable resistance board 1 along the guide rail 5 by the length of one side of the variable resistance board 1;
A circle slightly larger than the outer diameter of the resistor 2 on the variable resistance board 1 touches the resistor 2. A contact needle 11, a similar contact needle 12, and a contact needle 11 disposed at the intersection with approximately the center of the connected external terminal 3
The contact needles 13 are arranged alternately with a circle having a radius equal to the distance between the contact needles 11 and 12 and a circle having a diameter slightly larger than the diameter of the resistor 2. The upper contact needle group 10 has a contact needle 14 disposed at the intersection of a circle whose radius is the distance between the contact needles 11 and 12 and a circle having a diameter slightly larger than the diameter of the resistor 2, and is fixed to a holding metal fitting 15. A lower contact needle group 20 similar to the upper contact needle group 10 is provided on the upper side of the guide rail 5 and a lower contact needle group 20 similar to the upper contact needle group 10 is provided on the lower side. a contact portion 80 that operates in a direction tangent to the contact portion 8;
A selection circuit 30 selects two contact needles to be electrically connected to the external terminal of the resistor 2 from among the signals from a total of eight contact needles 11 to 14 and 21 to 24 of 0, and the selected 2 contact needles. A measuring circuit 40 that measures the resistance value between the contact needles of a book, a judgment circuit 50 that discriminates between good products, defective products, and subclassifications of non-defective products according to the resistance value, and a guide rail 5 according to the classification classification of the judgment circuit 50. It is composed of a sorting/storage section 90 that puts the variable resistance boards 1 sent from the source into designated storage boxes 91, and a control section 60 that controls all of the above.

FIG. 6 is a partial detailed view of the contact portion 80 of the embodiment shown in FIG.
The structure is such that the upper contact needle group 10 and the lower contact needle group 20 are guided by the kite 81 and come into contact with the variable resistance substrate 1 at the same time in response to a measurement start command, and are separated simultaneously in response to a measurement end command. FIG. 7 is a partial detailed view of the transfer mechanism 70 of the embodiment shown in FIG. The variable resistance board 1 is intermittently sent along the guide rail 5 by the length of one side of the variable resistance board 1 in response to a feed command from the control section 60. To operate the above, the transfer mechanism 70 is operated in response to a feed command from the control unit 60, and the variable resistance board 1 is fed onto the guide rail 5 to the intermittent point.

While the variable resistance substrates 1 are pressed together, the contact portions 80
When the process advances to this point, the contact section 80 is operated in response to a measurement start command from the control section 60, and the upper and lower contact needle groups 10 and 20 come into contact with the external terminal 3 of the variable resistance board 1. The selection circuit 30 selects only two contact needles connected to the external terminal 3 from the eight contact needles, and the resistance value is measured by the measurement circuit 40. The determination circuit 50 determines the classification of good products, defective products, and subclassification of non-defective products according to the resistance value, returns a signal to the control section 60, and temporarily stores the classification. Next, in response to a measurement end command from the control section 60, the contact needle groups 10, 20 of the contact section 80 are separated from the variable resistance substrate 1, and the transfer mechanism 70 operates to transport the variable resistance substrate 1. Repeating this operation, when the end of the guide rail 5 is reached, the classification storage section 90 is operated according to the classification category stored in the control section 60, and the storage box 91 specified by the control section 60 is placed under the end of the guide rail 5. Move and receive the variable resistance board. These series of operations are repeated to classify and select all variable resistance boards. Since the present invention is constructed as described above, it is possible to achieve much higher work efficiency than the conventional method of measuring and classifying by an operator, and at the same time, it is possible to automate the entire process, and its effects are immeasurable.

[Brief explanation of the drawing]

Fig. 1 shows a variable resistance board that is the subject of the present invention, Fig. 2 is a three-dimensional view showing the attitude when transferring the variable resistance board one row up, Fig. 3 is an explanatory diagram of the principle of the invention, and Fig. 4 5 is an explanatory view showing the arrangement of the contact needle, FIG. 5 shows an embodiment of the present invention, and FIGS. 6 and 7 are partial detailed views of the embodiment of FIG. 5.

Claims (1)

[Claims] 1. A transfer mechanism that intermittently transports the variable resistance board by the length of one side along the guide rail, and a group of upper contact needles arranged so that at least two of them are in contact with the external terminals of the variable resistance board are similarly placed above the guide rail. Equipped with a lower contact needle group on the lower side,
A contact section that simultaneously moves both contact needle groups up and down toward or away from the variable resistance board in response to a measurement start or end command, and two contacts that connect the contact needle groups of the contact section to the external terminals of the resistor. A selection circuit that selects needle signals, a measurement circuit that measures the resistance value between the two selected contact needles, and a judgment circuit that discriminates between good products, defective products, and subclassifications of non-defective products according to the resistance value. A variable resistance board sorting device comprising: a sorting/storage section for placing variable resistance boards sent from the guide rail into specified storage boxes according to the classification categories; and a control section for controlling all of the above.