JP2008140889A - Misinsertion detection structure and misinsertion detection method for polarized parts on printed circuit board - Google Patents

Abstract

More specifically, the present invention relates to mounting of a polarized component on a printed circuit board, and more particularly, to provide a structure and method for detecting erroneous insertion when mounting a polarized component on a printed circuit board.
A structure for detecting erroneous insertion of a polarized component into a printed circuit board includes a polarized component in which a specific terminal is molded into a predetermined shape, a check terminal including a conductor having a predetermined mounting height, and the printed circuit board. The polarized component is mounted at a predetermined position on the printed circuit board, and the check terminal is mounted at a position where the molding portion of the specific terminal of the polarized component contacts the check terminal, and the specific terminal and the check terminal of the polarized component are respectively The land or pad to be connected is configured as a measurement pad for detecting erroneous insertion by continuity check.
[Selection] Figure 1

Description

  The present invention relates to mounting a polarized component on a printed circuit board, and more particularly to a structure and method for detecting erroneous insertion when mounting a polarized component on a printed circuit board.

  Electrolytic capacitors, diodes, and the like have a predetermined direction in which voltage is applied, and are called polarized components. These polar parts display the polarity of the terminal on the exterior so that the polarity is correct when mounted on the printed circuit board. For example, in an electrolytic capacitor, it is a common practice to print a strip-shaped polarity mark on the exterior and indicate that a terminal close to the polarity mark is a negative polarity terminal. In addition, the polarity mark in the case of the diode is annular, and the lead wire close to the polarity mark is the cathode. An IC is also one of polarized components. For example, a “dot” or “notch” is provided on the package to indicate the direction of insertion into the printed circuit board. When these polar parts are mounted on a printed circuit board, the mounting direction is determined based on the polarity mark, and the terminals are inserted into the printed circuit board.

  In general, the printed circuit board after mounting the components is subjected to impedance measurement for confirming the component constants before confirming the energization operation. In this impedance measurement, impedance is measured from the terminals and lands of the printed circuit board, and it is checked whether or not a component with a different value is mounted. And the impedance value is different from the design value, and erroneous insertion can be detected. Also, for the same purpose, parts inserted into the printed circuit board are visually checked. In this case, the characters and symbols representing the polarity printed on the printed circuit board are checked and mounted on the printed circuit board. Check the component constant of the component, and if the component is a polarized component, check if the terminal indicated by the polarity mark is inserted correctly. FIG. 5 shows an example in which a polarized component is mounted on the printed circuit board 30 according to the prior art. For example, the component mounted on the left side of the printed circuit board 30 shows the electrolytic capacitor 10 as a polarized component and is printed on the exterior. The band-shaped mark thus formed is a polarity mark 11, and a terminal (lead wire) 12 close to the polarity mark 11 is a terminal having a negative polarity. Further, the component mounted on the right side shows an example of the diode 20, and the annular mark is the polarity mark 21. A terminal 23 close to the polarity mark 21 is a cathode. A visual check checks whether the terminals with such polarity marks are inserted and mounted in the correct direction.

As a method of definitely inserting a polarized component into a printed circuit board, a bent portion for preventing erroneous insertion is formed in one lead of the polarized component, and a mounting hole of the printed circuit board corresponding to this lead is formed in the bent portion of the lead. It is formed as a long hole so that can pass through. This is a proposal in which even if an attempt is made to insert a polarized component into a printed circuit board with a wrong polarity, the bent portion cannot pass through the hole and can prevent erroneous insertion (Patent Document 1).
Japanese Patent Laid-Open No. 11-251712

  As described above, impedance measurement is performed after components are mounted on a printed circuit board to detect erroneous insertion of polarized components. However, since the impedance of the reversely mounted electrolytic capacitor may not be significantly different from that of the positively mounted capacitor, and the variation in the impedance value of the electrolytic capacitor itself is relatively large, the forward / reverse is detected by the impedance value. There was a problem that it was difficult to do.

  Further, the visual method has a problem that when the mounting density is high, characters and symbols silk-printed on the printed circuit board are difficult to read because they are hidden behind the mounted components, and a long time is required for checking.

  The method proposed in Patent Document 1 has an effect of physically preventing erroneous insertion of polarized components, but has a problem that the cost of opening a long hole is high.

  An object of the present invention is to provide a structure and a method for reliably detecting a reverse-mounted polarized component while performing impedance measurement that has been conventionally performed.

The structure for detecting erroneous insertion of a polarized component into a printed circuit board and the method for detecting erroneous insertion according to the present invention are configured as follows.
(1) 1st invention The erroneous insertion detection structure to the printed circuit board of the polarized component of 1st invention comprises a polarized component, a check terminal, and a printed circuit board.

  A polarized component is a specific terminal molded into a predetermined shape, a check terminal is made of a conductor having a predetermined mounting height, and a printed circuit board is mounted by inserting the component to be mounted into a through hole. .

  The polarized component is mounted at a predetermined position on the printed circuit board, and the check terminal is mounted at a position where a molding portion of a specific terminal of the polarized component contacts the check terminal. The land or pad connected to the specific terminal and the check terminal of the polarized component is used as a measurement terminal for erroneous insertion detection by continuity check.

With the above structure, it is possible to determine whether the specific terminal of the polarized component is in contact with the check terminal by performing the continuity check. If there is a contact of the specific terminal when the polarized component is inserted into the printed circuit board in the correct direction, it can be determined that the contact is correct, and erroneous insertion can be detected.
(2) 2nd invention The erroneous insertion detection structure to the printed circuit board of the polarized component of 2nd invention is comprised from a polarized component, a check terminal, and a printed circuit board like the 1st invention. In addition, the polarized component is a specific terminal molded into a predetermined shape, the check terminal is made of a conductor having a predetermined mounting height, and the printed board is mounted by inserting the component to be mounted into the through hole, The polarized component is mounted at a predetermined position on the printed circuit board, and the check terminal is mounted at a position where a molded portion of a specific terminal of the polarized component is in contact with the check terminal.

  The second invention is characterized in that a land or pad connected to a circuit including a specific terminal of a polarized component and a check terminal is used as a terminal for erroneous insertion detection by impedance check.

With the above structure, it is possible to determine whether the specific terminal of the polarized component is in contact with the check terminal by performing the impedance check. If there is a contact of the specific terminal when the polarized component is inserted into the printed circuit board in the correct direction, it can be determined that the contact is correct, and erroneous insertion can be detected.
(3) Third invention A method for detecting erroneous insertion of a polarized component into a printed circuit board according to the third invention is a method of detecting a portion of a specific terminal of the polarized component molded into a predetermined shape in mounting on the printed circuit board. The polarized component and the check terminal are inserted and mounted in the through hole of the printed board formed at the mounting position where the check terminal made of a conductor having a mounting height comes into contact. Then, a continuity check is performed between the specific terminal into which the polarized component is inserted and the check terminal. If there is no continuity, it is determined that the polarized component is reversely mounted.

When the polarized component is inserted into the printed circuit board in the correct direction by the above method, it is possible to detect erroneous insertion of the polarized component by the continuity check or the impedance check if the specific terminal is in contact.
(4) 4th invention 4th invention WHEREIN: The predetermined shape shape | molded to the specific terminal of a polarized component in 1st and 2nd invention has a bending part. When the polarized component is mounted on the printed board, the bent portion contacts the check terminal.

By forming the specific terminal so that there is a bent portion, a structure in which contact with the check terminal is ensured at the time of mounting is obtained.
(5) Fifth Invention In the fifth invention, the predetermined shape formed in the specific terminal of the polarized component in the third invention has a bent portion, and this specific terminal is mounted when the polarized component is mounted. Makes sure contact with the check terminal.

  According to the first invention, a specific terminal (a negative pole terminal or a positive pole terminal) of a polarized component and a check terminal are brought into contact with each other at the time of mounting, so that an erroneous insertion of a polarized component is detected depending on the presence or absence of the contact. Can be provided.

  According to the second invention, it is possible to provide a structure capable of detecting erroneous insertion of a polarized component as in the first invention.

  According to the third invention, it is possible to provide a method capable of detecting erroneous insertion of a polarized component depending on whether or not a specific terminal of the polarized component is in contact with the check terminal, as in the first invention.

  According to the fourth aspect of the invention, it is possible to provide a structure capable of reliably making contact with the check terminal by forming a bent portion on a specific terminal and detecting erroneous insertion of a polarized component.

  According to the fifth aspect of the present invention, it is possible to provide a method capable of reliably making contact with a check terminal by forming a bent portion on a specific terminal and detecting erroneous insertion of a polarized component.

  An embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows a polarized part, a check terminal, and a printed board constituting the present invention. FIG. 1A shows an electrolytic capacitor 100 and a diode 200 similar to those shown in the prior art of FIG. A terminal 120 close to the polarity mark 110 shown in the electrolytic capacitor 100 is a terminal having a negative polarity, and is formed to have a bent portion as shown in the figure. The other terminal 130 is straight without being molded. Similarly to the electrolytic capacitor 100, the diode 200 is formed such that the cathode terminal 220 has a bent portion, and the other terminal 230 is straight.

  The component shown in FIG. 1B is a check terminal 400. The check terminal 400 is, for example, a 0.6 mmφ tin-plated copper wire (bare wire) formed into a “U” shape. The length of the check terminal 400 is 5 mm to 10 mm.

  FIG. 1C shows a printed circuit board 300 on which polarized components and check terminals are mounted. The upper diagram of FIG. 1C shows a diagram viewed from the component mounting surface, and symbols and symbols of components to be mounted are silk-printed. For example, a round shape 320 shown on the left side indicates that the electrolytic capacitor 100 is mounted at that position, and a “+” symbol 321 shown in the round shape indicates that a terminal with a positive polarity is inserted. Yes. A diode circuit symbol 322 indicates the position and direction in which the diode 200 is mounted.

  The lands 301 to 314 are formed on the pattern surface on the back side of the component mounting surface. Lands 301 and 302 are lands for mounting the electrolytic capacitor 100, and lands 303 and 304 are lands for mounting the diode 200. Lands 311 and 312 and lands 313 and 314 are lands on which check terminals 400 are mounted, respectively.

  The lower part of FIG. 1C shows the printed circuit board 300 as viewed from the side. The through hole opened in the land is shown. The upper surface is a component mounting surface, and the lower surface is a pattern surface on which lands and wiring patterns are formed.

  FIG. 2 shows an example in which the electrolytic capacitor 100, the diode 200, and the check terminal 400 shown in FIG. 2A is a view of the mounted state as viewed from the side, and FIG. 2B is a view of A-A ′ shown in FIG. 2A as viewed from below.

  In FIG. 2A, the check terminal 400 is first inserted, and then the electrolytic capacitor 100 or the diode 200 is inserted into the through hole. At this time, the electrolytic capacitor 100 or the diode 200 is inserted under pressure so that the bent portion formed on the terminal of the diode 200 is in contact with the check terminal 400. FIG. 2A shows the state at this time. Thereafter, the terminal that has passed through the through hole is bent outward and cut to a predetermined length so that the inserted component does not come off, and soldered when all the components have been inserted.

  FIG. 2B shows a state in which the bent portions of the terminal 120 of the electrolytic capacitor 100 or the terminal 230 of the diode 200 are in contact with the check terminal 400 as viewed from A-A ′. In FIG. 2B, a symbol printed on the component mounting surface and a land (shown by a dotted line) formed on the pattern surface are also shown, but a wiring pattern connected to the land is not shown here.

  Next, an example of erroneous insertion detection by continuity check and impedance check will be described with reference to FIGS.

  FIG. 3 illustrates an example of continuity check using the electrolytic capacitor 100 shown in FIG. 2. A battery is connected between a land 301 having a negative polarity terminal of the electrolytic capacitor 100 and a land 311 having a check terminal 400 inserted. The resistance value is measured by the ohmmeter 500 via 510 (the printed circuit board in FIG. 3 shows a state viewed from the pattern surface). If the measured value is approximately 0 ohms (ie, there is continuity), the bent portion of the negative polarity terminal of the electrolytic capacitor 100 is in contact with the check terminal 400, and the terminal inserted into the land 301 is correctly minus. It can be seen that the terminal has polarity. If there is no conduction, it is determined that a straight terminal has been inserted into the land 301 (that is, a terminal having no negative polarity), and there is a high possibility of erroneous insertion. The possibility is high that even if the terminal inserted into the land 302 is a negative polarity terminal 120, conduction is not obtained if the insertion is incomplete (for example, the terminal 120 is detached and floating). This is because there are cases. Conversely, such an incomplete insertion can be detected by the method of the present invention.

  As the land to be measured in FIG. 3, the land 311 is used in the land into which the check terminal 400 is inserted, but the land 312 may be used. The other land to be measured is the land 301 of the electrolytic capacitor 100. Of course, it may be an electrode pattern (not shown) or a pad connected to the electrode pattern.

  Next, an example of impedance check will be described with reference to FIG. In this case as well, an example of detection of erroneous insertion of the electrolytic capacitor 100 will be described. FIG. 4 shows a state in which a resistor 323 is connected through a wiring pattern 330 connected to the electrolytic capacitor 100, and the resistor 323 is further connected to a pad 307 through a wiring pattern 331. That is, the electrolytic capacitor 100 and the resistor 323 constitute a circuit. In the impedance check, the impedance between the land 311 of the check terminal 400 and the pad 307 is measured by the impedance meter 600 via the oscillator 610. If the measured impedance value is infinite, the negative polarity terminal 120 of the electrolytic capacitor 100 and the check terminal 400 are open, and it is determined that the electrolytic capacitor 100 has a high possibility of erroneous insertion. If correctly inserted, the measured impedance value should be a value obtained by adding the resistance value of the resistor 323 to the capacitance value of the electrolytic capacitor 100.

It is a mounting example (the 1) of the polarized component by this invention. It is a mounting example (the 2) of the polarized component by this invention. It is an example of a continuity check between the polarity terminal and check terminal of an electrolytic capacitor. It is an example of an impedance check including the polarity terminal of an electrolytic capacitor. It is an example of mounting of conventional polarized components.

Explanation of symbols

10 Electrolytic capacitor 11 Polarity mark 12 Terminal 13 Terminal (negative polarity)
20 Diode 21 Polarity mark 22 Terminal 23 Terminal (Cathode side terminal)
100 Electrolytic capacitor 110 Polarity mark 120 Terminal 130 terminal (Negative polarity)
200 Diode 210 Polarity mark 220 Terminal 230 Terminal (Cathode side terminal)
300 Printed circuit board 301-306 Land (for mounted components)
311-314 Land (for check terminal)
307 Pad 320 Silk-printed shape 321 Silk-printed symbol 322 Silk-printed circuit symbol 330, 331 Wiring pattern 400 Check terminal 500 Ohm meter (resistance meter)
510 battery 600 impedance meter 610 oscillator

Claims (5)

A polarized part in which a specific terminal is molded into a predetermined shape;
A check terminal made of a conductor having a predetermined mounting height;
It is equipped with a printed circuit board that is mounted by inserting the mounted component into the through hole,
The polarized component is mounted at a predetermined position on the printed circuit board, and the check terminal is mounted at a position where a molding portion of the specific terminal of the polarized component is in contact with the check terminal, and the specific terminal of the polarized component is A structure for detecting erroneous insertion of a polarized component on a printed circuit board, wherein a land or pad connected to each of the check terminals is a measurement terminal for detecting erroneous insertion by continuity check. A polarized part in which a specific terminal is molded into a predetermined shape;
A check terminal made of a conductor having a predetermined mounting height;
It is equipped with a printed circuit board that is mounted by inserting the mounted component into the through hole,
The polarized component is mounted at a predetermined position on the printed circuit board, and the check terminal is mounted at a position where a molding portion of the specific terminal of the polarized component is in contact with the check terminal, and the specific terminal of the polarized component is An erroneous insertion detection structure for a printed circuit board of a polarized component, wherein a land or pad connected to a circuit including the check terminal is used as an erroneous insertion detection terminal by impedance check. In the through hole of the printed circuit board formed at the mounting position where the part formed into the predetermined shape of the specific terminal of the polarized component and the check terminal made of the conductor having the predetermined mounting height contact in mounting on the printed circuit board , Insert and mount the polarized component and the check terminal,
Conduction check between the inserted specific terminal and the check terminal is performed, and if there is no conduction, it is determined that the polarized component is reversely mounted. Detection of erroneous insertion of a polarized component on a printed circuit board Method. 3. The polarized component according to claim 1, wherein the predetermined shape has a bent portion in the specific terminal, and the bent portion is in contact with the check terminal for mounting the printed circuit board. Structure for detecting erroneous insertion into a printed circuit board. The said predetermined shape has a bending part in the said specific terminal, and this bending part contacts the said check terminal for mounting of the said printed circuit board. The printed circuit board of the polarized component of Claim 3 characterized by the above-mentioned. Misinsertion detection method.

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