JPH10144568A - Electrolytic capacitor with reversal polarity attachment preventing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent reversal polarity attachment to a board, by making shapes of a positive side electrode and a negative side electrode different, and making at least one electrode possible to be inserted in only an aperture corresponding to the electrode, out of attaching apertures on a board to which the respective electrodes are inserted. SOLUTION: In an electrolytic capacitor 1, a light emitting diode 2 is arranged on the upper surface, and leads whose shapes of a positive side lead 3 and different from a negative side lead 4 as electrodes are arranged. In a circuit board on which the electrolytic capacitor 1 is mounted, an attaching aperture corresponding to the positive side lead 3, i.e., a positive side aperture 9, has a circular aperture into which the line type positive side lead 3 can be inserted. A negative side aperture 10 to which the negative side electrode 4 is fixed has a rectangular shape into which the negative side electrode 4 as a plate type lead can be inserted. Whether the capacitor polarity is normal is confirmed by the lighting of the light emitting diode 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic capacitor having a function of preventing reverse polarity mounting.

[0002]

2. Description of the Related Art Electrolytic capacitors are one of the basic electric elements that constitute them, and are widely used in electric circuits and the like. This electrolytic capacitor has polarity. If the polarity of the electrolytic capacitor is reversed by mistake for some reason when it is mounted on an electric circuit, the life of the electrolytic capacitor may be shortened, or the capacitor may explode and cause an accident.

FIG. 10 is a view showing the outer shape of a conventional electrolytic capacitor. As shown in the drawing, the conventional electrolytic capacitor 60 is provided with a component silk 61 on the negative side, and the lead for attaching to the substrate is also shortened on the negative side lead 62 and lengthened on the positive side lead 63. With such a configuration, the polarity is not mistaken when the capacitor 60 is attached to the substrate.

[0004]

However, in reality, the problem of the reverse mounting is still occasionally occurring even now, and damage is caused each time. The reason for such reverse mounting may be as follows.

First, FIG. 11 is a diagram showing a circuit diagram and a substrate silk. That is, in order to design and manufacture an electric circuit, a circuit diagram is created as shown in FIG. 11A, and a substrate is created as shown in FIG. 11B based on this circuit diagram. Then, components such as an IC and a capacitor are attached to the board to complete the electric circuit board. As a cause of the reverse mounting, first, an erroneous creation of a circuit diagram in a design stage can be considered. As shown in FIG. 11A, a pin number (terminal number) is assigned to the circuit diagram, but it is conceivable that the pin number may be reversed by carelessness of the designer. Thereby, the reverse mounting will be performed in a later step.

Next, when a substrate is created from a circuit diagram, there is a possibility that the display of the substrate silk is erroneously printed.
As shown in FIG. 11B, the substrate 64 is printed with a substrate silk indicating the position and the mounting direction of each component to be mounted.

[0007] In the case of an electrolytic capacitor, not only the mounting position of each capacitor but also information on the polarity of the capacitor, that is, which side of the lead insertion opening is the + side is indicated by the substrate silk. Therefore, even if the circuit diagram is accurate, if the polarity display is incorrect when printing the substrate silk, the reverse mounting is finally performed.

[0008] Further, there is a case where mounting is reversed in an actual mounting process. That is, as described above, even if the component silk 61 is attached to the capacitor 60 and the lengths of the leads 62 and 63 are changed, reverse mounting occurs inadvertently in reality. It is difficult to make no mistakes.

The present invention has been made in view of such circumstances, and has as its object to provide an electrolytic capacitor capable of preventing the polarity of the electrolytic capacitor from being attached to a substrate.

[0010]

In order to solve the above-mentioned problems, in the invention corresponding to claim 1, the shapes of the plus side electrode and the minus side electrode are different, and at least one of the electrodes has at least one of the electrodes. This is an electrolytic capacitor with a reverse-polarity mounting prevention function that can be inserted only into the mounting opening corresponding to the own electrode among the mounting openings on the substrate to be inserted.

[0011] With this configuration, the capacitor cannot be erroneously attached to the substrate, and the attachment of the opposite polarity can be prevented. The invention according to claim 2 is characterized in that the projection is provided on the same surface as the surface on which the plus side electrode and the minus side electrode are provided, and the projection is provided only when each electrode is inserted into its corresponding mounting opening. The projection is inserted into an opening on the substrate corresponding to the portion, and otherwise, the projection is unable to be attached to the substrate due to the projection.

With this configuration, the capacitor cannot be erroneously mounted on the substrate, and mounting of the opposite polarity can be prevented. Further, claim 3
The invention according to claim 1 or 2 is an electrolysis device having a reverse-polarity attachment preventing function, comprising a light-emitting means connected to the plus side electrode and the minus side electrode and lit when the polarity is correctly attached. It is a capacitor.

With such a structure, it is possible to prevent the capacitor from being erroneously attached to the substrate.
It is possible to confirm whether or not the opening of the substrate is properly opened by the light emitting display.

Further, the invention corresponding to claim 4 is:
The invention according to claim 1 or 2 is an electrolytic capacitor with a reverse-polarity attachment preventing function, comprising a light emitting means connected to the plus side electrode and the minus side electrode and illuminated when the polarity is wrongly attached.

With this configuration, it is possible to prevent the capacitor from being erroneously attached to the substrate.
Even when the substrate opening itself is wrong, the mistake can be confirmed by the light-emitting display.

[0016]

Embodiments of the present invention will be described below. (First Embodiment of the Invention) FIG. 1 is a configuration diagram showing an example of an electrolytic capacitor according to a first embodiment of the present invention.

As shown in FIG.
Is provided with a light emitting diode 2 (LED) on its upper surface, and leads of different shapes are provided for a plus lead 3 and a minus lead 4 as electrodes. Also,
In the vicinity of the negative side lead 4 on the cylindrical side surface, a component silk 5 having negative polarity is provided as a thick line in the vertical direction of the cylinder.

FIG. 2 is a diagram showing an example of an internal circuit of the electrolytic capacitor of the present embodiment. In the figure, the + side 3a is connected to the plus side lead 3, and the − side 4a is connected to the minus side lead 4. A capacitor body 6 is connected between the + side 3a and the − side 4a, and a constant current circuit 7 is connected in parallel with the capacitor body 6.

The terminal on the negative side 4a of the constant current circuit 7 and the negative terminal 4 in FIG.
The diode 8 and the light emitting diode 2 are connected in parallel between the side 4a. The diode 8 is connected to the negative side 4.
a is connected in the direction in which current flows from a to the + side 3a,
The light emitting diode 2 is connected in a direction in which a current flows from the + side 3a to the − side 4a to emit light. Therefore, the constant current circuit 7 allows the diode 8 or the light emitting diode 2
A constant current flows through either one of them.

Here, the circuit portions of the constant current circuit 7, the diode 8, and the light emitting diode 2 are shown in a bare chip form in FIG.
The electrolytic capacitor 1 shown in FIG. 1 is formed to have the same diameter (thickness in the direction perpendicular to the leads 3 and 4) as if there were no circuit portion. Therefore, the length in the height direction is increased by the amount corresponding to the provision of the bare chip.

FIG. 3 is a diagram showing a bottom portion of the electrolytic capacitor according to the present embodiment and a corresponding portion of the substrate. Each lead shape of the electrolytic capacitor 1 is different between the + side 3a and the − side 4a as described above. Specifically, as shown in FIG. 1A and FIG. 1, the plus-side lead 3 is a linear lead, and the minus-side lead 4 has a width in a direction orthogonal to the facing direction with the plus-side lead 3. It is a wide, plate-like lead.

In the circuit board (PCB board) on which the electrolytic capacitor 1 is mounted, as shown in FIG. 3B, the mounting opening corresponding to the positive lead 3, that is, the positive opening 9, is linear. A certain positive lead 3
It has a circular opening into which a can be inserted. On the other hand, the minus side opening 10 for attaching the minus side lead 4 is
It has a rectangular shape so that the negative lead 4 which is a plate-like lead can be inserted.

Therefore, the negative side lead 4 cannot be inserted into the positive side opening 9;
It cannot be installed upside down. Next, a method for using the electrolytic capacitor according to the embodiment of the present invention configured as described above will be described.

FIG. 4 is a diagram showing a state when the electrolytic capacitor of the present embodiment is mounted on a circuit board and energized. The electrolytic capacitor according to the present embodiment is mainly used for development evaluation of electric circuits. That is, in the process of creating a certain device and manufacturing the electric circuit, a test board for examining the operation characteristics and the like is usually created before starting mass production of the electric circuit board. .

At the time of the development evaluation, even if the electrolytic capacitor is reversely mounted, the electrolytic capacitor operates as a capacitor body. Therefore, even if the reverse mounting is performed due to a wrong circuit diagram or a wrong board silk, no abnormal mounting is detected.

Therefore, the test board 11 at the time of development evaluation
Then, when the electrolytic capacitor 1 of this embodiment is attached and the power is turned on, as shown in FIG. 2, when the polarity is properly attached, a constant current flows through the light emitting diode 2, so that the light emitting diode 2 is turned on. On the other hand, when the capacitor is mounted so that the polarity of the capacitor is reversed, a constant current flows through the diode 8 and no current flows through the light emitting diode 2, so that the light emitting diode 2 does not turn on.

As described above, it is confirmed by lighting of the light emitting diode 2 that the capacitor polarity is normal, and when the capacitor polarity is abnormal, it is detected by not turning on the light emitting diode.

That is, the electrolytic capacitor 1 is a normally-lit capacitor. When the electrolytic capacitor 1 is mounted on the test board 11, the openings on the board side correspond to the plus side opening 9 corresponding to the plus side lead 3 and the minus side lead 4 as shown in FIG. The opening 10 on the minus side.

Therefore, the mounting of the capacitor can always be performed only at a constant rate, and not only is the abnormality detected by the light emitting diode 2, but the normal or abnormal state as a result is uniquely determined. That is, since different results cannot be produced every time the capacitor is mounted, the normal or abnormal position of the substrate opening is determined.

As described above, in the electrolytic capacitor according to the embodiment of the present invention, when the polarity is normally attached to the circuit board, the light emitting diode 2 is turned on, and the shape of each lead is changed. Since only a certain way of mounting on the substrate is different, it is possible to make it very easy to confirm when the capacitor is normally connected, and to prevent the capacitor from being erroneously mounted.

Therefore, it is possible to reliably prevent the manufacture of an electric circuit in which the polarity of the capacitor is reversed.
In addition, according to the normally-lit electrolytic capacitor of the present embodiment, the light-emitting diode 2 is prevented from being turned on by any cause of abnormality such as power supply abnormality, stairs, incorrect wiring, and so on. , Any other anomalies can also be detected. (Second Embodiment of the Invention) The electrolytic capacitor of the present embodiment is different from the first embodiment only in the lead shape of the electrolytic capacitor of the first embodiment. It is configured similarly.

FIG. 5 is a side view showing the outer shape of an electrolytic capacitor according to a second embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Only mentioned.

FIG. 6 is a view showing a bottom portion of the electrolytic capacitor of this embodiment and a corresponding portion of the substrate. 5 and 6
As shown in (a), the electrolytic capacitor 1a of the present embodiment
Are linear plus-side leads 3b and plus-side leads 3b
In addition to the shorter linear negative side lead 4b, a linear plastic protrusion 12 having no particular electrical connection and shorter than the substrate thickness is provided.

As shown in FIG. 6A, a positive lead 3b and a negative lead 4b
Are arranged on a line passing through the center of the bottom surface with the center therebetween. On the other hand, the plastic protrusion 12 is arranged on another line orthogonal to the above line at the center of the bottom surface. Therefore,
When the capacitor 1a is viewed from below, a triangular shape is formed at the mounting point of the plus side lead 3b, the minus side lead 4b, and the plastic protrusion 12.

As shown in FIG. 6B, in the circuit board on which the electrolytic capacitor 1a is mounted, the plus side opening 9b and the minus side opening 10b corresponding to the plus side lead 3b and the minus side lead 4b, respectively, It has a circular through-opening into which the respective leads 3b and 4b which are linear can be inserted.

On the other hand, the plastic projection opening 13 corresponding to the plastic projection 12 is a circular non-through opening having a depth that can accommodate the plastic projection opening 13. The opening 13 is provided at a position where the plastic projection 12 is inserted when the capacitor 13 is mounted so that the capacitor polarity is correct.

Next, a method of using the electrolytic capacitor according to the embodiment of the present invention configured as described above will be described. The operation and usage of the electrolytic capacitor 1a are as follows.
Basically, it is the same as in the first embodiment.

The parts related to the leads 3b and 4b will be described. When attaching the electrolytic capacitor 1a to the wrong polarity, the plastic projection 1
2 hinders the insertion of the capacitor, and cannot be inserted into the substrate 11.

On the other hand, if the mounting is performed correctly, the plastic projection 12 is inserted into the plastic projection opening 13, so that the mounting can be performed. As described above, the electrolytic capacitor according to the embodiment of the present invention has the same configuration as that of the first embodiment, and also includes a plastic protrusion 1 in addition to the plus side lead 3b and the minus side lead 4b.
Since the structure 2 prevents the reverse mounting from being performed structurally, the same effect as that of the first embodiment can be obtained, and a mistake at the time of mounting the capacitor can be eliminated.

In this embodiment, the short plastic projection 12 is used as a means for preventing reverse attachment so as not to penetrate the substrate. However, the present invention is not limited to this. A hole may be formed, and the plastic protrusion 12 may be made longer so as to penetrate the substrate. At this time, instead of the plastic protrusion 12, a dummy lead having the same configuration as the plus side lead 3b or the minus side lead 4b may be used. (Third Embodiment of the Invention) In the first embodiment, the normal lighting type electrolytic capacitor in which the light emitting diode is turned on when the mounting is normal has been described.
In the present embodiment, an abnormal lighting type electrolytic capacitor in which a light emitting diode is turned on when mounting is reversed will be described.

In this electrolytic capacitor, only the circuit configuration of a portion relating to light emission of the light emitting diode is different from that of the first embodiment, and the other configuration is the same as that of the first embodiment.

FIG. 7 is a diagram showing an example of the internal circuit of the electrolytic capacitor according to the present embodiment. The same parts as those in FIG. In the circuit shown in the figure, the positional relationship of each element is the same as in the circuit shown in FIG.
The difference is that the diode 8a is connected from the positive side 3a to the negative side 4a.
The light emitting diode 2a is connected in the direction in which the current flows and emits light from the negative side 4a to the positive side 3a. Therefore, when the mounting of the capacitor is correct, the light emitting diode 2a does not emit light, and when the mounting of the capacitor is reversed, the light emitting diode 2a emits light.

The method of using the electrolytic capacitor thus configured is the same as that of the first embodiment. However,
As shown in FIG. 8, the light emitting state of the light emitting diode is different from the state of attachment.

FIG. 8 is a diagram showing a state when the electrolytic capacitor of the present embodiment is mounted on a circuit board and energized. In the same figure, the light emitting diode 2a is properly mounted.
2 shows a case where no light is emitted, and a case where the attachment is abnormal and the light emitting diode 2a emits light.

As described above, in the electrolytic capacitor according to the embodiment of the present invention, except that the mounting directions of the diode 8a and the light emitting diode 2a in the circuit are reversed.
Since the configuration similar to that of the first embodiment is provided, the same effect as that of the first embodiment can be obtained.

In the abnormal lighting type electrolytic capacitor, the light is turned on only when there is an abnormality.
a does not emit light, it is possible to detect only an abnormality in the reverse mounting of the capacitor, and the cause of the abnormality can be specified. Furthermore, since the light emitting diode does not light up in a normal case, unnecessary power consumption can be suppressed as much as possible, which is advantageous when the power consumption is one of the evaluation targets of the development board in mobile phones, PHSs, and other devices. It is.

In the capacitor of the present embodiment, the same lead shape as that of the first embodiment is used, but the lead portion is provided with a plastic projection or the like in the same manner as in the second embodiment. In this case, the same effect as in the second embodiment can be obtained. (Fourth Embodiment of the Invention) In each of the above embodiments, even if there is a design error or a display error of the substrate silk, the reverse polarity attachment is detected by the LED display, and the reverse attachment is prevented during the development evaluation of the electric circuit board. An electrolytic capacitor suitable for performing the above has been described. However, since the development evaluation capacitor includes the light emitting diode and an internal circuit for lighting the light emitting diode, the capacitor may not always be suitable for mass production.

Therefore, in the present embodiment, a description will be given of a mass-produced electrolytic capacitor which does not require such a light emitting diode and can prevent reverse mounting. FIG. 9 is a configuration diagram illustrating an example of the electrolytic capacitor according to the fourth embodiment of the present invention.

As shown in FIG.
Reference numeral 1 has the same configuration as the electrolytic capacitor of the first embodiment, except that a light emitting diode and an internal circuit for lighting the light emitting diode are removed from the upper surface.

That is, the plus side lead 3 and the minus side lead 4 are provided with different shapes, the plus side lead 3 is a linear lead, and the minus side lead 4 is a wide plate-like lead. I have. Therefore, reverse mounting is not possible.

The electrolytic capacitor 21 has the same outer diameter as that of the electrolytic capacitor of the first embodiment in the cylindrical portion which is the side portion, and only its height is reduced. Therefore, the electrolytic capacitor 21 is located at the same position on the same substrate.
And the electrolytic capacitor according to the first embodiment.

Next, a method of using the electrolytic capacitor according to the embodiment of the present invention configured as described above will be described. First, the electrolytic capacitor 21 may be used only with the electrolytic capacitor throughout the development and mass production of the electric board. In this case, plus / minus reverse mounting cannot be performed due to the difference in lead shape, and an error in mounting can be prevented.

The electrolytic capacitor 21 for mass production
Can be used in combination with the electrolytic capacitor 1 for development evaluation shown in FIG. The method of use in this case will be described below.

In this case, the electrolytic capacitor 21 for mass production
And the lead shape of the electrolytic capacitor 1 for development evaluation shown in FIG. In this way, the electrolytic capacitor 21 for mass production is mounted on the substrate on which the electrolytic capacitor 1 for development evaluation can be mounted with the same polarity and in a fixed direction.

Therefore, first, in the development inspection stage of the electric circuit board, the electrolytic capacitor 1 for development evaluation shown in FIG. 1 is used. In this way, if the state of the openings 9 and 10 of the board is such that the capacitor is mounted in reverse due to a design error or a board silk display error, this can be detected, and the board can be correctly identified in the development stage. Can be modified to state.

In the substrate thus modified, FIG.
Due to the difference between the plus side opening 9 and the minus side opening 10 shown in (b), the development evaluation capacitor 1 cannot be mounted in reverse and is always in a state of being mounted with the correct polarity. In addition, since the lead shape of the electrolytic capacitor 21 for mass production matches that of the capacitor 1 for development evaluation, when this substrate is used, the electrolytic capacitor 21 for mass production will also be attached with the correct polarity.

In the mass production stage of the electric circuit, the above-mentioned substrate is checked or corrected for correct polarity in the development stage and checked for design mistakes and board silk display mistakes.

If the mass-produced electrolytic capacitor 21 is used for the mass-produced substrate, it can be surely mounted with the correct polarity. As described above, the electrolytic capacitor according to the embodiment of the present invention uses differently shaped leads for the plus side lead and the minus side lead, so that it cannot be structurally reverse-attached when attached to the substrate, A mistake at the time of assembly can be prevented.

In the method for mounting an electrolytic capacitor according to the present embodiment, the capacitor 1 of the first embodiment shown in FIG. 1 is used in the development evaluation stage, and the opening silk or the like is used in the development evaluation stage in the mass production stage. The capacitor 2 for mass production shown in FIG.
1 is used, so it is possible to prevent reverse mounting due to design mistakes and board silk display mistakes, and also to prevent mounting mistakes at the time of mounting, and to reduce the cost of capacitors by eliminating the need for circuits such as light emitting diodes. can do.

In this embodiment, the mass-production capacitor corresponding to the first embodiment has been described. However, the present invention is not limited to this, and the second and third embodiments are not limited to this. Correspondingly, a mass-production capacitor with the LED circuit and the like deleted may be manufactured. In that case, the lead shape corresponds to that of each embodiment. The present invention is not limited to the above embodiments, and can be variously modified without departing from the gist thereof.

[0061]

As described above in detail, according to the present invention, the display by the light emitting diode is provided, and the lead shape is made different between the plus side and the minus side. It is possible to provide an electrolytic capacitor that can prevent the occurrence of such a problem.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of an electrolytic capacitor according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of an internal circuit of the electrolytic capacitor according to the embodiment.

FIG. 3 is a diagram showing a bottom portion and a corresponding portion of a substrate of the electrolytic capacitor according to the embodiment;

FIG. 4 is a diagram showing a state when the electrolytic capacitor of the embodiment is mounted on a circuit board and energized.

FIG. 5 is a side view showing the outer shape of the electrolytic capacitor according to the second embodiment of the present invention.

FIG. 6 is a diagram showing a bottom portion and a corresponding portion of a substrate of the electrolytic capacitor according to the embodiment.

FIG. 7 is a diagram showing an example of an internal circuit of the electrolytic capacitor according to the embodiment.

FIG. 8 is a diagram showing a state when the electrolytic capacitor of the embodiment is attached to a circuit board and energized.

FIG. 9 is a configuration diagram showing an example of an electrolytic capacitor according to a fourth embodiment of the present invention.

FIG. 10 is a view showing the outer shape of a conventional electrolytic capacitor.

FIG. 11 is a diagram showing a circuit diagram and a substrate silk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electrolytic capacitor 2 ... Light emitting diode 3 ... Positive side lead 4 ... Minus side lead 5 ... Component silk 6 ... Capacitor main body 7 ... Constant current circuit 8 ... Diode 9 ... Positive side opening 10 ... Minus side opening 11 ... Substrate 12 ... Plastic Projection 13: Opening for plastic projection

Claims (4)

[Claims] The positive electrode and the negative electrode have different shapes, and at least one of the electrodes can be inserted only into the one corresponding to the own electrode among the mounting openings on the substrate into which the respective electrodes are inserted. An electrolytic capacitor with a reverse-polarity mounting prevention function. 2. A protruding portion is provided on the same surface as the surface on which the plus side electrode and the minus side electrode are provided, and only when each electrode is inserted into its corresponding mounting opening on the substrate corresponding to the protruding portion. Wherein the projection is inserted into the opening of the substrate, and otherwise, the projection cannot be attached to the substrate because of the projection. 3. A reverse polarity attachment prevention function according to claim 1, further comprising a light emitting means connected to said plus side electrode and said minus side electrode and lit when the polarity is correctly attached. With electrolytic capacitor. 4. The prevention of reverse-polarity attachment according to claim 1, further comprising a light-emitting means connected to the plus-side electrode and the minus-side electrode and turned on when the polarity is wrongly attached. Electrolytic capacitor with function.