JP2006286969A - Electronic component and circuit board mounting the same, recording device and electronic apparatus incorporating circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic component with a built-in explosion-proof valve to prevent any leakage of white smokes or abnormal odors emerging from the inside due to actuation of the explosion-proof valve using a simple structure. <P>SOLUTION: In a method to attach a cap 200 comprising a storage 201, a vertical extender 202, and an annular extender 203 to an aluminum electrolytic capacitor 100, white smokes or abnormal odors emerging from the inside of the aluminum electrolytic capacitor 100 due to leakage of its electrolytic solution can be trapped assuredly with a simple structure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic component including an explosion-proof valve that prevents explosion due to an increase in internal pressure, a circuit board including the electronic component, a recording device including the circuit board, and an electronic apparatus.

  In general, an electronic device includes various electronic components, and the electronic components are mounted on a substrate. Among the various electronic components described above, the electrolytic capacitor stores a capacitor element impregnated with an electrolytic solution in a metal case. When an overvoltage higher than the rating is applied to the electrolytic capacitor, the organic solvent of the electrolytic solution is vaporized and hydrogen gas or the like is generated by an electrochemical reaction. Since these gases increase the internal pressure of the metal case and cause an explosion, an explosion-proof valve for preventing the explosion is provided. The explosion-proof valve forms a thin part in a part of the metal case, and opens and functions when the internal pressure exceeds a threshold value. As a result, the electrolytic capacitor safely fails without exploding.

However, there is a problem that when the explosion-proof valve is operated, the electrolyte is ejected and adheres to the substrate or other electronic components. In addition, white smoke and off-flavor leaking from the inside of the electronic device may give the user a misunderstanding that it is due to ignition. In view of this, an electrolytic capacitor has been proposed in which a gelling agent is disposed above the explosion-proof valve so that the electrolyte is gelled to prevent ejection outside. (For example, patent document 1 description)
JP-A-5-13289

  However, according to the electrolytic capacitor described in Patent Document 1 described above, there is a problem in that it cannot be denied that the white smoke and off-flavor associated with the vaporized electrolyte solution may leak to the outside. Further, in the capacitor manufacturing stage, it is necessary to dispose a gelling agent and further to provide a holding member for disposing the gelling agent. Therefore, there is a problem that the structure of the electrolytic capacitor becomes complicated and the manufacturing cost increases.

  The present invention has been made in view of the above problems, and in an electronic component provided with an explosion-proof valve, provides an electronic component that prevents white smoke and off-flavors ejected from the inside by the operation of the explosion-proof valve with a simple structure. The purpose is to do.

  In order to achieve the above object, the electronic component of the present invention is an electronic component provided with an explosion-proof valve that prevents an explosion due to an increase in internal pressure at the time of failure, and is ejected from the electronic component when the explosion-proof valve is operated. A sealing member for sealing the contents of the electronic component or the reaction product of the contents is attached.

  Thereby, when an electronic component breaks down, the explosion-proof valve operates to cause a safe failure, and it is possible to prevent the contents of the electronic component ejected from the electronic component and the reaction product of the content from leaking to the outside. Therefore, it is possible to prevent unnecessary misunderstandings for the user.

  In the electronic component according to the present invention, the enclosing member includes a cap that is attached to the electronic component so as to surround the explosion-proof valve and expands in a balloon shape when the explosion-proof valve is operated. Thereby, even when there are many contents of the electronic component ejected from the electronic component or a reaction product of the content, the cap can swell and cope with it.

  In the electronic component of the present invention, the cap includes an annular expansion / contraction portion that prevents the cap from being detached from the electronic component when the explosion-proof valve is operated. Thereby, since an annular expansion-contraction part shrink | contracts and it urges | biases to an electronic component, it can prevent that a cap remove | deviates by the pressure of the content of the electronic component which ejects from an electronic component, or the reaction material of a content.

  In the electronic component of the present invention, the annular stretchable part is configured to include an annular rubber. Thereby, it can prevent easily that a cap remove | deviates by the pressure of the content of the electronic component which ejects from an electronic component, or the reaction material of a content. Moreover, it is possible to simply attach the rubber by extending the rubber and hanging it on the electronic component in the attaching process of the cap.

  In the electronic component of the present invention, the cap has a height direction expansion / contraction portion that expands and contracts in the height direction of the electronic component so as to cover at least a main portion of the electronic component when extended. Thereby, the height direction expansion-contraction part expands and contracts, absorbs the difference in height, and can be attached to electronic components of various heights.

  In the electronic component of the present invention, the electronic component is an aluminum electrolytic capacitor. Thereby, the aluminum electrolytic capacitor which has said each effect can be provided.

  In addition, the circuit board of the present invention includes any one of the above electronic components. As a result, a circuit board having the above-described effects can be provided. In addition, the recording apparatus of the present invention includes any one of the above electronic components. Thereby, a recording apparatus that exhibits the above-described effects can be provided. The electronic apparatus according to the present invention includes any one of the above electronic components. Thereby, the electronic device which has said each effect can be provided.

  Further, in the structure for preventing leakage of the contents of the aluminum electrolytic capacitor of the present invention, an aluminum electrolytic capacitor provided with an explosion-proof valve for preventing an explosion due to an increase in internal pressure at the time of failure, and the explosion-proof valve when the explosion-proof valve is operated. In the structure for preventing leakage of the contents of the aluminum electrolytic capacitor, the contents of the aluminum electrolytic capacitor ejected from the cap or a cap for enclosing the reaction product of the contents, the cap extends at least in the shape of a balloon and the aluminum A container for enclosing the content of the electrolytic capacitor or a reaction product of the content, and an annular expansion / contraction portion for preventing the internal pressure from coming off from the aluminum electrolytic capacitor when the explosion-proof valve is operated, The annularly contracting portion is locked to a recess provided in a case of the aluminum electrolytic capacitor.

  Thereby, since an annular expansion-contraction part latches in the recessed part provided in the aluminum electrolytic capacitor, and shrinks | contracts in the recessed part of an aluminum electrolytic capacitor, it can make it difficult to remove a cap. In addition, the position where the cap is extended and attached in the cap attaching process is made constant, so that the accuracy of the attaching operation can be improved.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

  First, a recording apparatus 10 as an “electronic device” including an electronic component according to the present invention will be described as an example.

  FIG. 1 is a perspective view showing an appearance of a recording apparatus according to an embodiment of the present invention. A recording apparatus 10 shown in FIG. 1 includes an upper cover 12, an upper housing 13, and a lower housing 14, and an opening 15 is provided on the front surface. When the recording material 11 is inserted into the insertion port 15, recording is performed on the recording material 11 by the recording device 10, and the recording material 11 is discharged from the insertion port 15.

  The upper housing 13 can be opened and closed for measures such as when the recording material 11 is jammed. Here, the recording material 11 is a cut sheet, a film, a copy sheet in which a plurality of sheets are overlapped, a passbook, or the like cut to a predetermined length.

  Next, the main control board 40 and the power supply board 50 of the recording apparatus 10 will be described with reference to FIG. FIG. 2 is a perspective view showing the main control board 40, the power supply board 50, and the vicinity thereof in the recording apparatus 10. FIG.

  In the vicinity of the center right in FIG. 2, power system components and logic system components are mounted, and a main control board 40 that mainly constitutes a control unit of the recording apparatus 10 is disposed in the horizontal direction. On the left side of the main control board 40, a power supply board 50 on which a primary power supply group 51 is mounted is disposed in the horizontal direction.

  The main control board 40 includes a connector area 41 where various connectors are disposed, a power system component mounting area 42 where power system parts are mounted, and a logic system component mounting area 43 where logic system parts are mounted.

  In the power system component mounting region 42, for example, power system components such as a motor driver and a head driver (not shown) and heat sinks 42a and 42b for releasing heat generated from these are mounted.

  In the logic system component mounting area 43, logic system parts such as CPU and ROM are mounted, and the logic system component mounting area 43 is provided at a position where it can be easily accessed with the interface unit 44 provided on the back surface of the recording apparatus 10. ing.

  Various components mounted on the connector area 41, the power system component mounting area 42, and the logic system component mounting area 43 are connected via a circuit pattern (not shown) provided on the main control board 40.

  Next, the power supply substrate 50 will be described. On the power supply board 50, a primary side component group 51 is constituted by various components. In the primary side component group 51, for example, a transformer, a transistor as a switching element, an aluminum electrolytic capacitor 100, and the like are mounted. Here, as described above, an object of the present invention is to prevent leakage of white smoke and off-flavors that are ejected when the explosion-proof valve 107 (see FIG. 3) of the aluminum electrolytic capacitor 100 is operated.

  Hereinafter, the aluminum electrolytic capacitor 100 according to the present embodiment will be described with reference to FIG. 3, and the cap 200 for preventing leakage of white smoke and off-flavor will be described with reference to FIG. 4. In the present embodiment, one aluminum electrolytic capacitor 100 mounted on the power supply substrate 50 will be described. However, the number of aluminum electrolytic capacitors 100 mounted on the power supply substrate 50 is not limited to one. Further, the present invention is naturally applicable to a case where an aluminum electrolytic capacitor is mounted on the main control board 40 or other board.

  FIG. 3 is a cross-sectional view of the aluminum electrolytic capacitor 100 according to the present embodiment. The cross section is a view of the surface indicated by the broken line in FIG.

  In the aluminum electrolytic capacitor 100, a capacitor element 101 impregnated with an electrolytic solution is housed in a metal case 102.

  Capacitor element 101 is configured by winding each of an anode foil and a cathode foil via electrolytic paper. The anode foil is made of a roughened aluminum foil, and an aluminum oxide film is formed as a dielectric on the surface. The cathode film is made of an aluminum foil. Electrolytic paper is thin paper that impregnates an electrolytic solution using an organic solvent.

  The metal case 102 has a bottomed cylindrical shape, and the opening end side is sealed with a sealing member 103. The sealing member 103 prevents deterioration of the capacitor element 101 and the electrolytic solution by sealing the opening end side of the metal case 102 and blocking the outside from the outside. On the other hand, an explosion-proof valve 107 is provided on the bottom side of the metal case 102. A recess 104 having a diameter smaller than that of the periphery is formed on the side surface on the opening end side of the metal case 102.

  The leads 105 and 106 are led out from the opening end side of the metal case 102 through the sealing member 103. The leads 105 and 106 are electrically connected to the anode foil and the cathode foil, respectively. A charge is stored by applying a voltage between the anode and cathode leads 105 and 106. Here, when an overvoltage is applied between the anode and cathode leads 105 and 106, the capacitor element 101 generates heat. When the capacitor element 101 generates heat, the electrolyte solution impregnated by the capacitor element 101 is vaporized, and a gas such as hydrogen gas is generated by an electrochemical reaction of the electrolyte solution. By generating these gases, the internal pressure in the metal case 102 increases.

  The explosion-proof valve 107 is formed thinner at the bottom of the metal case 102 than the surroundings. The explosion-proof valve 107 is configured to be able to open when the internal pressure increases. Specifically, it has grooves radially from the center of the bottom of the metal case 102 toward the outside (see FIG. 2). When the explosion-proof valve is activated, the valve opens along the groove, and the electrolytic solution in the metal case 102, the vaporized electrolytic solution, and the like are discharged. As a result, the internal pressure is reduced, and the aluminum electrolytic capacitor 100 safely fails without exploding.

  Next, a cap 200 that is attached to the aluminum electrolytic capacitor 100 to prevent leakage of white smoke or odor to the outside will be described with reference to FIG. FIG. 4 is a front view of the cap 200 attached to the aluminum electrolytic capacitor 100 shown in FIG.

  When the cap 200 is classified according to its function, the cap 200 includes a housing part 201, a vertical elastic part 202, and an annular elastic part 203. The cap 200 is formed of a material having elasticity that can be expanded and contracted. Preferably, the cap 200 is formed of a material that has high heat resistance and high erosion resistance against an electrolytic solution in addition to stretchability.

  The accommodating portion 201 is a portion that accommodates gas, electrolyte, and the like that are ejected when the explosion-proof valve 107 is operated. The accommodating part 201 accommodates gas, electrolyte solution, etc., and prevents the leakage of the white smoke and a strange odor to the exterior. Specifically, the accommodating part 201 accommodates gas, electrolyte solution, etc. by expanding and contracting freely in the shape of a balloon. Thereby, it can accommodate reliably, without depending on the magnitude | sizes of the volume of gas, electrolyte solution, etc. which generate | occur | produce. Further, when the explosion-proof valve 107 is not operated, the housing portion 201 is in a contracted state. Therefore, it does not occupy a large space above the metal case 102. That is, since the accommodating part 201 expands and contracts freely, it is not necessary to enlarge the accommodating part 201 on the assumption that the volume of the generated gas, electrolyte, or the like is large.

  The vertical expansion / contraction part 202 has a function of freely expanding and contracting in the vertical direction. Here, in this embodiment, the shape of the vertical expansion-contraction part 202 is comprised by the bellows shape. First, the vertical expansion / contraction part 202 extends by the amount of the bellows folded. Further, the vertical stretchable portion 202 is formed of a material having elasticity that can be stretched as described above. Therefore, the vertical stretchable part 202 itself of the cap 200 also expands. Therefore, the height difference of the aluminum electrolytic capacitor 100 can be absorbed by expanding / contracting the vertical expansion / contraction part 202, and the cap 200 can be attached to the aluminum electrolytic capacitor 100 of various heights.

  The annular elastic part 203 has a function of freely expanding and contracting in the horizontal direction. The annular expansion / contraction portion 203 is configured by incorporating, for example, an annular rubber. As a result, the annular expansion / contraction portion 203 contracts and urges the aluminum electrolytic capacitor 100, thereby making it difficult to remove the cap 200. Further, when the cap 200 is attached to the aluminum electrolytic capacitor 100, the annular expansion / contraction portion 203 expands / contracts according to the diameter of the aluminum electrolytic capacitor 100, so that the cap 200 can be attached to the aluminum electrolytic capacitor 100 of various diameters.

  Further, the cap 200 of the present embodiment is configured in a transparent color. Thereby, the rating etc. of the electrolyte solution described on the surface of the metal case 102 (refer FIG. 3) can be visually recognized from the outside.

  In the above-described configuration of the aluminum electrolytic capacitor 100 and the cap 200, a procedure for attaching the cap 200 will be described with reference to FIG. FIG. 5 is a front view showing a procedure for attaching the cap 200 to the aluminum electrolytic capacitor 100. FIG. 5A shows a state when the cap 200 is attached to the aluminum electrolytic capacitor 100. FIG. 5B shows a state in which the cap 200 is being attached to the aluminum electrolytic capacitor 100. FIG. 5C shows a state after the cap 200 is attached to the aluminum electrolytic capacitor 100.

  First, as shown in FIG. 5A, the cap 200 extends from the bottom side of the metal case 102 as shown in FIG. 5B by extending the annular stretchable portion 203 in accordance with the diameter of the aluminum electrolytic capacitor 100. The cap 200 is attached so as to cover substantially the entire circumference of the metal case 102 as shown in FIG. That is, the vertical elastic part 202 is extended until the annular elastic part 203 is positioned in the concave part 104 on the side surface of the metal case 102. And it attaches so that the annular expansion-contraction part 203 may latch on the recessed part 104. FIG. Therefore, the cap 200 is locked to the recess 104, and the annular elastic part 203 is further contracted and urged to the metal case 102 as described above. Thereby, the explosion-proof valve 107 is actuated to prevent the cap 200 from being removed due to the pressure when the gas, the electrolyte, or the like is released to the outside.

  In addition, in the shape of the aluminum electrolytic capacitor 100, it is common to form a recess 104 in the metal case 102. Therefore, it is not necessary to provide an attachment portion for attaching the cap 200 specially. Further, in the process of attaching the cap 200, it is possible to make constant how far the vertical stretchable part 202 extends downward, and improve the accuracy of the attaching operation. Further, when the explosion-proof valve 107 is not in operation, the accommodating portion 201 is in a contracted state, and the space between the cap 200 and the aluminum electrolytic capacitor 100 is very small as shown in FIG. In this way, it is not necessary to provide a space in the space between the cap 200 and the aluminum electrolytic capacitor 100 in preparation for the operation of the explosion-proof valve 107.

  As is clear from the description of FIGS. 5A to 5C described above, the cap 200 according to the present embodiment can be attached to the aluminum electrolytic capacitor 100 by a very simple method. Accordingly, it is possible to prevent white smoke and odor from leaking and to reduce the manufacturing cost.

  Next, a state where the explosion-proof valve 107 is operated will be described. FIG. 6 is a cross-sectional view showing a state where the explosion-proof valve 107 of the aluminum electrolytic capacitor 100 to which the cap 200 is attached is activated. As shown in FIG. 6, the explosion-proof valve 107 is operated, and the electrolyte, vaporized electrolyte, hydrogen gas, and the like are ejected upward from the valve opening location with white smoke and a strange odor. At this time, the accommodating portion 201 accommodates the gas that is expanded upward and is ejected without leaking.

  As described above, according to the aluminum electrolytic capacitor 100 of the present embodiment, the explosion-proof valve 107 that prevents the explosion by increasing the pressure at the time of failure is provided. Further, a cap 200 is attached that encloses an electrolytic solution ejected from the aluminum electrolytic capacitor 100 when the explosion-proof valve 107 is operated, a vaporized electrolytic solution, hydrogen gas, or the like.

  As a result, when the aluminum electrolytic capacitor 100 fails due to the application of overvoltage or reverse voltage, the explosion-proof valve 107 is operated to cause a safe failure, and the electrolytic solution ejected from the aluminum electrolytic capacitor 100 or the vaporized electrolytic solution It can prevent leakage to the outside. Therefore, it is possible to prevent an unnecessary misunderstanding from being given to the user due to white smoke or a strange odor of the evaporated electrolyte.

  Further, the cap 200 is attached to the aluminum electrolytic capacitor 100 so as to surround the explosion-proof valve 107, and expands in a balloon shape when the explosion-proof valve 107 is operated, so that the electrolytic solution ejected from the aluminum electrolytic capacitor 100 or vaporized electrolytic solution or Even when there is a lot of hydrogen gas or the like, the cap 200 can swell and cope with it.

  Further, since the cap 200 has an annular expansion / contraction portion 203 that prevents the explosion-proof valve 107 from being detached from the aluminum electrolytic capacitor 100, the annular expansion / contraction portion 203 contracts and attaches to the aluminum electrolytic capacitor 100. The cap 200 can be prevented from being removed by the pressure of the gas ejected from the aluminum electrolytic capacitor 100.

  Moreover, since the annular expansion / contraction part 203 is comprised including cyclic | annular rubber | gum, it can prevent easily that the cap 200 remove | deviates by the pressure of the gas which ejects from the aluminum electrolytic capacitor 100. FIG. Further, it is possible to simply attach the cap 200 by simply extending the rubber and hanging it on the aluminum electrolytic capacitor in the attaching process of the cap 200.

  Further, since the cap 200 has a vertical expansion / contraction portion 202 which is a height direction expansion / contraction portion that expands / contracts in the height direction of the aluminum electrolytic capacitor 100 so as to cover at least the main portion of the aluminum electrolytic capacitor 100 when it is extended, The vertical expansion / contraction part 202 expands and contracts to absorb the difference in height, and can be attached to the aluminum electrolytic capacitor 100 having various heights.

  Further, according to the structure for preventing leakage of the contents of the aluminum electrolytic capacitor 100, the aluminum electrolytic capacitor 100 provided with the explosion-proof valve 107 that prevents the internal pressure from rising and exploding at the time of failure, and the explosion-proof valve when the explosion-proof valve 107 is activated. The cap 200 encloses the electrolytic solution of the aluminum electrolytic capacitor 100 ejected from the valve 107 or the vaporized electrolytic solution and hydrogen gas. Further, the cap 200 extends at least in a balloon shape to contain the electrolytic solution of the aluminum electrolytic capacitor 100 or the vaporized electrolytic solution and hydrogen gas, and when the explosion-proof valve 107 is activated, the cap 200 is subjected to aluminum electrolysis by internal pressure. An annular expansion / contraction portion 203 that prevents the cap 100 from coming off, and the annular contraction portion 203 is engaged with the recess 104 provided in the metal case 102 of the aluminum electrolytic capacitor 100, so that the cap 200 is not easily removed. Can do. In addition, the position where the cap 200 is extended and attached in the attaching process of the cap 200 is made constant, and the accuracy of the attaching operation can be improved.

  The scope of the present invention is not limited to the above-described embodiments, and can be applied to various other embodiments as long as they do not contradict the description of the scope of claims. For example, in the above-described embodiment, the aluminum electrolytic capacitor 100 in which the leads 105 and 106 are inserted into the power supply substrate 50 and mounted is taken as an example. The present invention can also be applied to the capacitor 100.

  In the present embodiment, the cylindrical aluminum electrolytic capacitor 100 has been described. However, the shape of the aluminum electrolytic capacitor 100 is not limited thereto.

  In this embodiment, the cap 200 is made of the same material. However, for example, different materials may be used depending on the function.

  In the present embodiment, the cap 200 is transparent, but is not particularly limited thereto, and may be colored. However, the rating and the like of the aluminum electrolytic capacitor 100 can be visually recognized even after the cap 200 is attached to the transparent side.

  Further, in this embodiment, the cap 200 is configured by the accommodating portion 201, the vertical stretchable portion 202, and the annular stretchable portion 203. However, the present invention is not limited to this, and gas, electrolyte solution, or the like leaks. It is applicable if it can be prevented. That is, any of the components of the cap may be missing, or a new configuration may be added.

  In the present embodiment, the vertical stretchable portion 202 of the cap 200 is formed in a bellows shape, but the shape is not limited to a bellows shape, and the cap 200 itself is made of a stretchable material. By doing so, it sufficiently functions as the vertical expansion / contraction section 202.

  Moreover, in this embodiment, although the cyclic | annular expansion-contraction part 203 of the cap 200 shall be comprised by incorporating elastic members, such as rubber | gum, it is not restricted to this. For example, after attaching the cap 200 to the aluminum electrolytic capacitor 100, the periphery of the cap 200 may be further urged toward the aluminum electrolytic capacitor 100 by another elastic member such as rubber.

  In the present embodiment, when the cap 200 is attached in the mounting process is not limited. For example, the aluminum electrolytic capacitor 100 can be attached before being mounted on the power supply substrate 50. Further, for example, the aluminum electrolytic capacitor 100 can be attached after being mounted on the power supply substrate 50, and can be attached at a wide stage in the mounting process.

  Any electronic device including an electronic component provided with an explosion-proof valve can be applied to, for example, a printer, a facsimile machine, a copying machine, and the like.

1 is a perspective view illustrating an appearance of a recording apparatus according to an embodiment of the present invention. FIG. 3 is a perspective view showing a main control board, a power supply board, and the vicinity in the vicinity of the inside of the recording apparatus. It is sectional drawing of the aluminum electrolytic capacitor 100 which concerns on this embodiment. It is a front view of the cap attached to the aluminum electrolytic capacitor shown in FIG. It is a front view which shows the procedure which attaches a cap to an aluminum electrolytic capacitor. It is sectional drawing which shows the state which the explosion-proof valve of the aluminum electrolytic capacitor which attached the cap act | operated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Recording device, 11 Recorded object, 12 Upper cover, 13 Upper housing, 14 Lower housing, 15 Insert, 40 Main control board, 41 Connector area, 42 Power system component mounting area, 42a, 42b Heat sink 43 Logic system component mounting Area, 44 Interface section, 50 Power supply board, 51 Primary part group, 100 Aluminum electrolytic capacitor, 101 Capacitor element, 102 Metal case, 103 Sealing member, 104 Recess, 105, 106 Lead, 107 Explosion-proof valve, 200 cap, 201 , 202 Vertical stretchable part, 203 Annular stretchable part

Claims (10)

In electronic components with explosion-proof valves that prevent explosion due to an increase in internal pressure at the time of failure,
An electronic component comprising: an enclosing member that encloses the contents of the electronic component ejected from the electronic component or the reaction product of the content when the explosion-proof valve is operated.   2. The electronic component according to claim 1, wherein the enclosing member includes a cap that is attached to the electronic component so as to surround the explosion-proof valve and expands in a balloon shape when the explosion-proof valve is operated. parts.   3. The electronic component according to claim 2, wherein the cap has an annular expansion / contraction portion that prevents the cap from being detached from the electronic component when the explosion-proof valve is operated.   4. The electronic component according to claim 3, wherein the annular stretchable part includes an annular rubber.   5. The electronic component according to claim 2, wherein the cap has a height direction expansion / contraction portion that expands / contracts in a height direction of the electronic component so as to cover at least a main portion of the electronic component when extended. Electronic parts.   6. The electronic component according to claim 1, wherein the electronic component is an aluminum electrolytic capacitor.   A circuit board comprising the electronic component according to claim 1.   A recording apparatus comprising the circuit board according to claim 7.   An electronic apparatus comprising the circuit board according to claim 7. An aluminum electrolytic capacitor provided with an explosion-proof valve that prevents an explosion due to an increase in internal pressure at the time of failure, and the contents of the aluminum electrolytic capacitor that are ejected from the explosion-proof valve when the explosion-proof valve is operated or a reaction of the contents In the structure for preventing leakage of contents of an aluminum electrolytic capacitor having a cap that encloses an object
The cap is at least a container that extends in a balloon shape and encloses the contents of the aluminum electrolytic capacitor or a reaction product of the contents;
When the explosion-proof valve is actuated, an annular expansion / contraction part that prevents the internal pressure from coming off from the aluminum electrolytic capacitor, and
The structure for preventing leakage of contents of an aluminum electrolytic capacitor, wherein the annular contraction portion is locked to a recess provided in a case of the aluminum electrolytic capacitor.

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